xilinx/xilinx_dma.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * DMA driver for Xilinx Video DMA Engine
   4  *
   5  * Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved.
   6  *
   7  * Based on the Freescale DMA driver.
   8  *
   9  * Description:
  10  * The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP
  11  * core that provides high-bandwidth direct memory access between memory
  12  * and AXI4-Stream type video target peripherals. The core provides efficient
  13  * two dimensional DMA operations with independent asynchronous read (S2MM)
  14  * and write (MM2S) channel operation. It can be configured to have either
  15  * one channel or two channels. If configured as two channels, one is to
  16  * transmit to the video device (MM2S) and another is to receive from the
  17  * video device (S2MM). Initialization, status, interrupt and management
  18  * registers are accessed through an AXI4-Lite slave interface.
  19  *
  20  * The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that
  21  * provides high-bandwidth one dimensional direct memory access between memory
  22  * and AXI4-Stream target peripherals. It supports one receive and one
  23  * transmit channel, both of them optional at synthesis time.
  24  *
  25  * The AXI CDMA, is a soft IP, which provides high-bandwidth Direct Memory
  26  * Access (DMA) between a memory-mapped source address and a memory-mapped
  27  * destination address.
  28  *
  29  * The AXI Multichannel Direct Memory Access (AXI MCDMA) core is a soft
  30  * Xilinx IP that provides high-bandwidth direct memory access between
  31  * memory and AXI4-Stream target peripherals. It provides scatter gather
  32  * (SG) interface with multiple channels independent configuration support.
  33  *
  34  */
  35
  36 #include <linux/bitops.h>
  37 #include <linux/dmapool.h>
  38 #include <linux/dma/xilinx_dma.h>
  39 #include <linux/init.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/io.h>
  42 #include <linux/iopoll.h>
  43 #include <linux/module.h>
  44 #include <linux/of.h>
  45 #include <linux/of_dma.h>
  46 #include <linux/of_irq.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/slab.h>
  49 #include <linux/clk.h>
  50 #include <linux/io-64-nonatomic-lo-hi.h>
  51
  52 #include "../dmaengine.h"
  53
  54 /* Register/Descriptor Offsets */
  55 #define XILINX_DMA_MM2S_CTRL_OFFSET             0x0000
  56 #define XILINX_DMA_S2MM_CTRL_OFFSET             0x0030
  57 #define XILINX_VDMA_MM2S_DESC_OFFSET            0x0050
  58 #define XILINX_VDMA_S2MM_DESC_OFFSET            0x00a0
  59
  60 /* Control Registers */
  61 #define XILINX_DMA_REG_DMACR                    0x0000
  62 #define XILINX_DMA_DMACR_DELAY_MAX              0xff
  63 #define XILINX_DMA_DMACR_DELAY_SHIFT            24
  64 #define XILINX_DMA_DMACR_FRAME_COUNT_MAX        0xff
  65 #define XILINX_DMA_DMACR_FRAME_COUNT_SHIFT      16
  66 #define XILINX_DMA_DMACR_ERR_IRQ                BIT(14)
  67 #define XILINX_DMA_DMACR_DLY_CNT_IRQ            BIT(13)
  68 #define XILINX_DMA_DMACR_FRM_CNT_IRQ            BIT(12)
  69 #define XILINX_DMA_DMACR_MASTER_SHIFT           8
  70 #define XILINX_DMA_DMACR_FSYNCSRC_SHIFT 5
  71 #define XILINX_DMA_DMACR_FRAMECNT_EN            BIT(4)
  72 #define XILINX_DMA_DMACR_GENLOCK_EN             BIT(3)
  73 #define XILINX_DMA_DMACR_RESET                  BIT(2)
  74 #define XILINX_DMA_DMACR_CIRC_EN                BIT(1)
  75 #define XILINX_DMA_DMACR_RUNSTOP                BIT(0)
  76 #define XILINX_DMA_DMACR_FSYNCSRC_MASK          GENMASK(6, 5)
  77 #define XILINX_DMA_DMACR_DELAY_MASK             GENMASK(31, 24)
  78 #define XILINX_DMA_DMACR_FRAME_COUNT_MASK       GENMASK(23, 16)
  79 #define XILINX_DMA_DMACR_MASTER_MASK            GENMASK(11, 8)
  80
  81 #define XILINX_DMA_REG_DMASR                    0x0004
  82 #define XILINX_DMA_DMASR_EOL_LATE_ERR           BIT(15)
  83 #define XILINX_DMA_DMASR_ERR_IRQ                BIT(14)
  84 #define XILINX_DMA_DMASR_DLY_CNT_IRQ            BIT(13)
  85 #define XILINX_DMA_DMASR_FRM_CNT_IRQ            BIT(12)
  86 #define XILINX_DMA_DMASR_SOF_LATE_ERR           BIT(11)
  87 #define XILINX_DMA_DMASR_SG_DEC_ERR             BIT(10)
  88 #define XILINX_DMA_DMASR_SG_SLV_ERR             BIT(9)
  89 #define XILINX_DMA_DMASR_EOF_EARLY_ERR          BIT(8)
  90 #define XILINX_DMA_DMASR_SOF_EARLY_ERR          BIT(7)
  91 #define XILINX_DMA_DMASR_DMA_DEC_ERR            BIT(6)
  92 #define XILINX_DMA_DMASR_DMA_SLAVE_ERR          BIT(5)
  93 #define XILINX_DMA_DMASR_DMA_INT_ERR            BIT(4)
  94 #define XILINX_DMA_DMASR_SG_MASK                BIT(3)
  95 #define XILINX_DMA_DMASR_IDLE                   BIT(1)
  96 #define XILINX_DMA_DMASR_HALTED         BIT(0)
  97 #define XILINX_DMA_DMASR_DELAY_MASK             GENMASK(31, 24)
  98 #define XILINX_DMA_DMASR_FRAME_COUNT_MASK       GENMASK(23, 16)
  99
 100 #define XILINX_DMA_REG_CURDESC                  0x0008
 101 #define XILINX_DMA_REG_TAILDESC         0x0010
 102 #define XILINX_DMA_REG_REG_INDEX                0x0014
 103 #define XILINX_DMA_REG_FRMSTORE         0x0018
 104 #define XILINX_DMA_REG_THRESHOLD                0x001c
 105 #define XILINX_DMA_REG_FRMPTR_STS               0x0024
 106 #define XILINX_DMA_REG_PARK_PTR         0x0028
 107 #define XILINX_DMA_PARK_PTR_WR_REF_SHIFT        8
 108 #define XILINX_DMA_PARK_PTR_WR_REF_MASK         GENMASK(12, 8)
 109 #define XILINX_DMA_PARK_PTR_RD_REF_SHIFT        0
 110 #define XILINX_DMA_PARK_PTR_RD_REF_MASK         GENMASK(4, 0)
 111 #define XILINX_DMA_REG_VDMA_VERSION             0x002c
 112
 113 /* Register Direct Mode Registers */
 114 #define XILINX_DMA_REG_VSIZE                    0x0000
 115 #define XILINX_DMA_REG_HSIZE                    0x0004
 116
 117 #define XILINX_DMA_REG_FRMDLY_STRIDE            0x0008
 118 #define XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT   24
 119 #define XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT   0
 120
 121 #define XILINX_VDMA_REG_START_ADDRESS(n)        (0x000c + 4 * (n))
 122 #define XILINX_VDMA_REG_START_ADDRESS_64(n)     (0x000c + 8 * (n))
 123
 124 #define XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP    0x00ec
 125 #define XILINX_VDMA_ENABLE_VERTICAL_FLIP        BIT(0)
 126
 127 /* HW specific definitions */
 128 #define XILINX_MCDMA_MAX_CHANS_PER_DEVICE       0x20
 129 #define XILINX_DMA_MAX_CHANS_PER_DEVICE         0x2
 130 #define XILINX_CDMA_MAX_CHANS_PER_DEVICE        0x1
 131
 132 #define XILINX_DMA_DMAXR_ALL_IRQ_MASK   \
 133                 (XILINX_DMA_DMASR_FRM_CNT_IRQ | \
 134                  XILINX_DMA_DMASR_DLY_CNT_IRQ | \
 135                  XILINX_DMA_DMASR_ERR_IRQ)
 136
 137 #define XILINX_DMA_DMASR_ALL_ERR_MASK   \
 138                 (XILINX_DMA_DMASR_EOL_LATE_ERR | \
 139                  XILINX_DMA_DMASR_SOF_LATE_ERR | \
 140                  XILINX_DMA_DMASR_SG_DEC_ERR | \
 141                  XILINX_DMA_DMASR_SG_SLV_ERR | \
 142                  XILINX_DMA_DMASR_EOF_EARLY_ERR | \
 143                  XILINX_DMA_DMASR_SOF_EARLY_ERR | \
 144                  XILINX_DMA_DMASR_DMA_DEC_ERR | \
 145                  XILINX_DMA_DMASR_DMA_SLAVE_ERR | \
 146                  XILINX_DMA_DMASR_DMA_INT_ERR)
 147
 148 /*
 149  * Recoverable errors are DMA Internal error, SOF Early, EOF Early
 150  * and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC
 151  * is enabled in the h/w system.
 152  */
 153 #define XILINX_DMA_DMASR_ERR_RECOVER_MASK       \
 154                 (XILINX_DMA_DMASR_SOF_LATE_ERR | \
 155                  XILINX_DMA_DMASR_EOF_EARLY_ERR | \
 156                  XILINX_DMA_DMASR_SOF_EARLY_ERR | \
 157                  XILINX_DMA_DMASR_DMA_INT_ERR)
 158
 159 /* Axi VDMA Flush on Fsync bits */
 160 #define XILINX_DMA_FLUSH_S2MM           3
 161 #define XILINX_DMA_FLUSH_MM2S           2
 162 #define XILINX_DMA_FLUSH_BOTH           1
 163
 164 /* Delay loop counter to prevent hardware failure */
 165 #define XILINX_DMA_LOOP_COUNT           1000000
 166
 167 /* AXI DMA Specific Registers/Offsets */
 168 #define XILINX_DMA_REG_SRCDSTADDR       0x18
 169 #define XILINX_DMA_REG_BTT              0x28
 170
 171 /* AXI DMA Specific Masks/Bit fields */
 172 #define XILINX_DMA_MAX_TRANS_LEN_MIN    8
 173 #define XILINX_DMA_MAX_TRANS_LEN_MAX    23
 174 #define XILINX_DMA_V2_MAX_TRANS_LEN_MAX 26
 175 #define XILINX_DMA_CR_COALESCE_MAX      GENMASK(23, 16)
 176 #define XILINX_DMA_CR_DELAY_MAX         GENMASK(31, 24)
 177 #define XILINX_DMA_CR_CYCLIC_BD_EN_MASK BIT(4)
 178 #define XILINX_DMA_CR_COALESCE_SHIFT    16
 179 #define XILINX_DMA_CR_DELAY_SHIFT       24
 180 #define XILINX_DMA_BD_SOP               BIT(27)
 181 #define XILINX_DMA_BD_EOP               BIT(26)
 182 #define XILINX_DMA_BD_COMP_MASK         BIT(31)
 183 #define XILINX_DMA_COALESCE_MAX         255
 184 #define XILINX_DMA_NUM_DESCS            512
 185 #define XILINX_DMA_NUM_APP_WORDS        5
 186
 187 /* AXI CDMA Specific Registers/Offsets */
 188 #define XILINX_CDMA_REG_SRCADDR         0x18
 189 #define XILINX_CDMA_REG_DSTADDR         0x20
 190
 191 /* AXI CDMA Specific Masks */
 192 #define XILINX_CDMA_CR_SGMODE          BIT(3)
 193
 194 #define xilinx_prep_dma_addr_t(addr)    \
 195         ((dma_addr_t)((u64)addr##_##msb << 32 | (addr)))
 196
 197 /* AXI MCDMA Specific Registers/Offsets */
 198 #define XILINX_MCDMA_MM2S_CTRL_OFFSET           0x0000
 199 #define XILINX_MCDMA_S2MM_CTRL_OFFSET           0x0500
 200 #define XILINX_MCDMA_CHEN_OFFSET                0x0008
 201 #define XILINX_MCDMA_CH_ERR_OFFSET              0x0010
 202 #define XILINX_MCDMA_RXINT_SER_OFFSET           0x0020
 203 #define XILINX_MCDMA_TXINT_SER_OFFSET           0x0028
 204 #define XILINX_MCDMA_CHAN_CR_OFFSET(x)          (0x40 + (x) * 0x40)
 205 #define XILINX_MCDMA_CHAN_SR_OFFSET(x)          (0x44 + (x) * 0x40)
 206 #define XILINX_MCDMA_CHAN_CDESC_OFFSET(x)       (0x48 + (x) * 0x40)
 207 #define XILINX_MCDMA_CHAN_TDESC_OFFSET(x)       (0x50 + (x) * 0x40)
 208
 209 /* AXI MCDMA Specific Masks/Shifts */
 210 #define XILINX_MCDMA_COALESCE_SHIFT             16
 211 #define XILINX_MCDMA_COALESCE_MAX               24
 212 #define XILINX_MCDMA_IRQ_ALL_MASK               GENMASK(7, 5)
 213 #define XILINX_MCDMA_COALESCE_MASK              GENMASK(23, 16)
 214 #define XILINX_MCDMA_CR_RUNSTOP_MASK            BIT(0)
 215 #define XILINX_MCDMA_IRQ_IOC_MASK               BIT(5)
 216 #define XILINX_MCDMA_IRQ_DELAY_MASK             BIT(6)
 217 #define XILINX_MCDMA_IRQ_ERR_MASK               BIT(7)
 218 #define XILINX_MCDMA_BD_EOP                     BIT(30)
 219 #define XILINX_MCDMA_BD_SOP                     BIT(31)
 220
 221 /**
 222  * struct xilinx_vdma_desc_hw - Hardware Descriptor
 223  * @next_desc: Next Descriptor Pointer @0x00
 224  * @pad1: Reserved @0x04
 225  * @buf_addr: Buffer address @0x08
 226  * @buf_addr_msb: MSB of Buffer address @0x0C
 227  * @vsize: Vertical Size @0x10
 228  * @hsize: Horizontal Size @0x14
 229  * @stride: Number of bytes between the first
 230  *          pixels of each horizontal line @0x18
 231  */
 232 struct xilinx_vdma_desc_hw {
 233         u32 next_desc;
 234         u32 pad1;
 235         u32 buf_addr;
 236         u32 buf_addr_msb;
 237         u32 vsize;
 238         u32 hsize;
 239         u32 stride;
 240 } __aligned(64);
 241
 242 /**
 243  * struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA
 244  * @next_desc: Next Descriptor Pointer @0x00
 245  * @next_desc_msb: MSB of Next Descriptor Pointer @0x04
 246  * @buf_addr: Buffer address @0x08
 247  * @buf_addr_msb: MSB of Buffer address @0x0C
 248  * @reserved1: Reserved @0x10
 249  * @reserved2: Reserved @0x14
 250  * @control: Control field @0x18
 251  * @status: Status field @0x1C
 252  * @app: APP Fields @0x20 - 0x30
 253  */
 254 struct xilinx_axidma_desc_hw {
 255         u32 next_desc;
 256         u32 next_desc_msb;
 257         u32 buf_addr;
 258         u32 buf_addr_msb;
 259         u32 reserved1;
 260         u32 reserved2;
 261         u32 control;
 262         u32 status;
 263         u32 app[XILINX_DMA_NUM_APP_WORDS];
 264 } __aligned(64);
 265
 266 /**
 267  * struct xilinx_aximcdma_desc_hw - Hardware Descriptor for AXI MCDMA
 268  * @next_desc: Next Descriptor Pointer @0x00
 269  * @next_desc_msb: MSB of Next Descriptor Pointer @0x04
 270  * @buf_addr: Buffer address @0x08
 271  * @buf_addr_msb: MSB of Buffer address @0x0C
 272  * @rsvd: Reserved field @0x10
 273  * @control: Control Information field @0x14
 274  * @status: Status field @0x18
 275  * @sideband_status: Status of sideband signals @0x1C
 276  * @app: APP Fields @0x20 - 0x30
 277  */
 278 struct xilinx_aximcdma_desc_hw {
 279         u32 next_desc;
 280         u32 next_desc_msb;
 281         u32 buf_addr;
 282         u32 buf_addr_msb;
 283         u32 rsvd;
 284         u32 control;
 285         u32 status;
 286         u32 sideband_status;
 287         u32 app[XILINX_DMA_NUM_APP_WORDS];
 288 } __aligned(64);
 289
 290 /**
 291  * struct xilinx_cdma_desc_hw - Hardware Descriptor
 292  * @next_desc: Next Descriptor Pointer @0x00
 293  * @next_desc_msb: Next Descriptor Pointer MSB @0x04
 294  * @src_addr: Source address @0x08
 295  * @src_addr_msb: Source address MSB @0x0C
 296  * @dest_addr: Destination address @0x10
 297  * @dest_addr_msb: Destination address MSB @0x14
 298  * @control: Control field @0x18
 299  * @status: Status field @0x1C
 300  */
 301 struct xilinx_cdma_desc_hw {
 302         u32 next_desc;
 303         u32 next_desc_msb;
 304         u32 src_addr;
 305         u32 src_addr_msb;
 306         u32 dest_addr;
 307         u32 dest_addr_msb;
 308         u32 control;
 309         u32 status;
 310 } __aligned(64);
 311
 312 /**
 313  * struct xilinx_vdma_tx_segment - Descriptor segment
 314  * @hw: Hardware descriptor
 315  * @node: Node in the descriptor segments list
 316  * @phys: Physical address of segment
 317  */
 318 struct xilinx_vdma_tx_segment {
 319         struct xilinx_vdma_desc_hw hw;
 320         struct list_head node;
 321         dma_addr_t phys;
 322 } __aligned(64);
 323
 324 /**
 325  * struct xilinx_axidma_tx_segment - Descriptor segment
 326  * @hw: Hardware descriptor
 327  * @node: Node in the descriptor segments list
 328  * @phys: Physical address of segment
 329  */
 330 struct xilinx_axidma_tx_segment {
 331         struct xilinx_axidma_desc_hw hw;
 332         struct list_head node;
 333         dma_addr_t phys;
 334 } __aligned(64);
 335
 336 /**
 337  * struct xilinx_aximcdma_tx_segment - Descriptor segment
 338  * @hw: Hardware descriptor
 339  * @node: Node in the descriptor segments list
 340  * @phys: Physical address of segment
 341  */
 342 struct xilinx_aximcdma_tx_segment {
 343         struct xilinx_aximcdma_desc_hw hw;
 344         struct list_head node;
 345         dma_addr_t phys;
 346 } __aligned(64);
 347
 348 /**
 349  * struct xilinx_cdma_tx_segment - Descriptor segment
 350  * @hw: Hardware descriptor
 351  * @node: Node in the descriptor segments list
 352  * @phys: Physical address of segment
 353  */
 354 struct xilinx_cdma_tx_segment {
 355         struct xilinx_cdma_desc_hw hw;
 356         struct list_head node;
 357         dma_addr_t phys;
 358 } __aligned(64);
 359
 360 /**
 361  * struct xilinx_dma_tx_descriptor - Per Transaction structure
 362  * @async_tx: Async transaction descriptor
 363  * @segments: TX segments list
 364  * @node: Node in the channel descriptors list
 365  * @cyclic: Check for cyclic transfers.
 366  * @err: Whether the descriptor has an error.
 367  * @residue: Residue of the completed descriptor
 368  */
 369 struct xilinx_dma_tx_descriptor {
 370         struct dma_async_tx_descriptor async_tx;
 371         struct list_head segments;
 372         struct list_head node;
 373         bool cyclic;
 374         bool err;
 375         u32 residue;
 376 };
 377
 378 /**
 379  * struct xilinx_dma_chan - Driver specific DMA channel structure
 380  * @xdev: Driver specific device structure
 381  * @ctrl_offset: Control registers offset
 382  * @desc_offset: TX descriptor registers offset
 383  * @lock: Descriptor operation lock
 384  * @pending_list: Descriptors waiting
 385  * @active_list: Descriptors ready to submit
 386  * @done_list: Complete descriptors
 387  * @free_seg_list: Free descriptors
 388  * @common: DMA common channel
 389  * @desc_pool: Descriptors pool
 390  * @dev: The dma device
 391  * @irq: Channel IRQ
 392  * @id: Channel ID
 393  * @direction: Transfer direction
 394  * @num_frms: Number of frames
 395  * @has_sg: Support scatter transfers
 396  * @cyclic: Check for cyclic transfers.
 397  * @genlock: Support genlock mode
 398  * @err: Channel has errors
 399  * @idle: Check for channel idle
 400  * @terminating: Check for channel being synchronized by user
 401  * @tasklet: Cleanup work after irq
 402  * @config: Device configuration info
 403  * @flush_on_fsync: Flush on Frame sync
 404  * @desc_pendingcount: Descriptor pending count
 405  * @ext_addr: Indicates 64 bit addressing is supported by dma channel
 406  * @desc_submitcount: Descriptor h/w submitted count
 407  * @seg_v: Statically allocated segments base
 408  * @seg_mv: Statically allocated segments base for MCDMA
 409  * @seg_p: Physical allocated segments base
 410  * @cyclic_seg_v: Statically allocated segment base for cyclic transfers
 411  * @cyclic_seg_p: Physical allocated segments base for cyclic dma
 412  * @start_transfer: Differentiate b/w DMA IP's transfer
 413  * @stop_transfer: Differentiate b/w DMA IP's quiesce
 414  * @tdest: TDEST value for mcdma
 415  * @has_vflip: S2MM vertical flip
 416  * @irq_delay: Interrupt delay timeout
 417  */
 418 struct xilinx_dma_chan {
 419         struct xilinx_dma_device *xdev;
 420         u32 ctrl_offset;
 421         u32 desc_offset;
 422         spinlock_t lock;
 423         struct list_head pending_list;
 424         struct list_head active_list;
 425         struct list_head done_list;
 426         struct list_head free_seg_list;
 427         struct dma_chan common;
 428         struct dma_pool *desc_pool;
 429         struct device *dev;
 430         int irq;
 431         int id;
 432         enum dma_transfer_direction direction;
 433         int num_frms;
 434         bool has_sg;
 435         bool cyclic;
 436         bool genlock;
 437         bool err;
 438         bool idle;
 439         bool terminating;
 440         struct tasklet_struct tasklet;
 441         struct xilinx_vdma_config config;
 442         bool flush_on_fsync;
 443         u32 desc_pendingcount;
 444         bool ext_addr;
 445         u32 desc_submitcount;
 446         struct xilinx_axidma_tx_segment *seg_v;
 447         struct xilinx_aximcdma_tx_segment *seg_mv;
 448         dma_addr_t seg_p;
 449         struct xilinx_axidma_tx_segment *cyclic_seg_v;
 450         dma_addr_t cyclic_seg_p;
 451         void (*start_transfer)(struct xilinx_dma_chan *chan);
 452         int (*stop_transfer)(struct xilinx_dma_chan *chan);
 453         u16 tdest;
 454         bool has_vflip;
 455         u8 irq_delay;
 456 };
 457
 458 /**
 459  * enum xdma_ip_type - DMA IP type.
 460  *
 461  * @XDMA_TYPE_AXIDMA: Axi dma ip.
 462  * @XDMA_TYPE_CDMA: Axi cdma ip.
 463  * @XDMA_TYPE_VDMA: Axi vdma ip.
 464  * @XDMA_TYPE_AXIMCDMA: Axi MCDMA ip.
 465  *
 466  */
 467 enum xdma_ip_type {
 468         XDMA_TYPE_AXIDMA = 0,
 469         XDMA_TYPE_CDMA,
 470         XDMA_TYPE_VDMA,
 471         XDMA_TYPE_AXIMCDMA
 472 };
 473
 474 struct xilinx_dma_config {
 475         enum xdma_ip_type dmatype;
 476         int (*clk_init)(struct platform_device *pdev, struct clk **axi_clk,
 477                         struct clk **tx_clk, struct clk **txs_clk,
 478                         struct clk **rx_clk, struct clk **rxs_clk);
 479         irqreturn_t (*irq_handler)(int irq, void *data);
 480         const int max_channels;
 481 };
 482
 483 /**
 484  * struct xilinx_dma_device - DMA device structure
 485  * @regs: I/O mapped base address
 486  * @dev: Device Structure
 487  * @common: DMA device structure
 488  * @chan: Driver specific DMA channel
 489  * @flush_on_fsync: Flush on frame sync
 490  * @ext_addr: Indicates 64 bit addressing is supported by dma device
 491  * @pdev: Platform device structure pointer
 492  * @dma_config: DMA config structure
 493  * @axi_clk: DMA Axi4-lite interace clock
 494  * @tx_clk: DMA mm2s clock
 495  * @txs_clk: DMA mm2s stream clock
 496  * @rx_clk: DMA s2mm clock
 497  * @rxs_clk: DMA s2mm stream clock
 498  * @s2mm_chan_id: DMA s2mm channel identifier
 499  * @mm2s_chan_id: DMA mm2s channel identifier
 500  * @max_buffer_len: Max buffer length
 501  * @has_axistream_connected: AXI DMA connected to AXI Stream IP
 502  */
 503 struct xilinx_dma_device {
 504         void __iomem *regs;
 505         struct device *dev;
 506         struct dma_device common;
 507         struct xilinx_dma_chan *chan[XILINX_MCDMA_MAX_CHANS_PER_DEVICE];
 508         u32 flush_on_fsync;
 509         bool ext_addr;
 510         struct platform_device  *pdev;
 511         const struct xilinx_dma_config *dma_config;
 512         struct clk *axi_clk;
 513         struct clk *tx_clk;
 514         struct clk *txs_clk;
 515         struct clk *rx_clk;
 516         struct clk *rxs_clk;
 517         u32 s2mm_chan_id;
 518         u32 mm2s_chan_id;
 519         u32 max_buffer_len;
 520         bool has_axistream_connected;
 521 };
 522
 523 /* Macros */
 524 #define to_xilinx_chan(chan) \
 525         container_of(chan, struct xilinx_dma_chan, common)
 526 #define to_dma_tx_descriptor(tx) \
 527         container_of(tx, struct xilinx_dma_tx_descriptor, async_tx)
 528 #define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
 529         readl_poll_timeout_atomic(chan->xdev->regs + chan->ctrl_offset + reg, \
 530                                   val, cond, delay_us, timeout_us)
 531
 532 /* IO accessors */
 533 static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg)
 534 {
 535         return ioread32(chan->xdev->regs + reg);
 536 }
 537
 538 static inline void dma_write(struct xilinx_dma_chan *chan, u32 reg, u32 value)
 539 {
 540         iowrite32(value, chan->xdev->regs + reg);
 541 }
 542
 543 static inline void vdma_desc_write(struct xilinx_dma_chan *chan, u32 reg,
 544                                    u32 value)
 545 {
 546         dma_write(chan, chan->desc_offset + reg, value);
 547 }
 548
 549 static inline u32 dma_ctrl_read(struct xilinx_dma_chan *chan, u32 reg)
 550 {
 551         return dma_read(chan, chan->ctrl_offset + reg);
 552 }
 553
 554 static inline void dma_ctrl_write(struct xilinx_dma_chan *chan, u32 reg,
 555                                    u32 value)
 556 {
 557         dma_write(chan, chan->ctrl_offset + reg, value);
 558 }
 559
 560 static inline void dma_ctrl_clr(struct xilinx_dma_chan *chan, u32 reg,
 561                                  u32 clr)
 562 {
 563         dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) & ~clr);
 564 }
 565
 566 static inline void dma_ctrl_set(struct xilinx_dma_chan *chan, u32 reg,
 567                                  u32 set)
 568 {
 569         dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) | set);
 570 }
 571
 572 /**
 573  * vdma_desc_write_64 - 64-bit descriptor write
 574  * @chan: Driver specific VDMA channel
 575  * @reg: Register to write
 576  * @value_lsb: lower address of the descriptor.
 577  * @value_msb: upper address of the descriptor.
 578  *
 579  * Since vdma driver is trying to write to a register offset which is not a
 580  * multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits
 581  * instead of a single 64 bit register write.
 582  */
 583 static inline void vdma_desc_write_64(struct xilinx_dma_chan *chan, u32 reg,
 584                                       u32 value_lsb, u32 value_msb)
 585 {
 586         /* Write the lsb 32 bits*/
 587         writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg);
 588
 589         /* Write the msb 32 bits */
 590         writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4);
 591 }
 592
 593 static inline void dma_writeq(struct xilinx_dma_chan *chan, u32 reg, u64 value)
 594 {
 595         lo_hi_writeq(value, chan->xdev->regs + chan->ctrl_offset + reg);
 596 }
 597
 598 static inline void xilinx_write(struct xilinx_dma_chan *chan, u32 reg,
 599                                 dma_addr_t addr)
 600 {
 601         if (chan->ext_addr)
 602                 dma_writeq(chan, reg, addr);
 603         else
 604                 dma_ctrl_write(chan, reg, addr);
 605 }
 606
 607 static inline void xilinx_axidma_buf(struct xilinx_dma_chan *chan,
 608                                      struct xilinx_axidma_desc_hw *hw,
 609                                      dma_addr_t buf_addr, size_t sg_used,
 610                                      size_t period_len)
 611 {
 612         if (chan->ext_addr) {
 613                 hw->buf_addr = lower_32_bits(buf_addr + sg_used + period_len);
 614                 hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used +
 615                                                  period_len);
 616         } else {
 617                 hw->buf_addr = buf_addr + sg_used + period_len;
 618         }
 619 }
 620
 621 static inline void xilinx_aximcdma_buf(struct xilinx_dma_chan *chan,
 622                                        struct xilinx_aximcdma_desc_hw *hw,
 623                                        dma_addr_t buf_addr, size_t sg_used)
 624 {
 625         if (chan->ext_addr) {
 626                 hw->buf_addr = lower_32_bits(buf_addr + sg_used);
 627                 hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used);
 628         } else {
 629                 hw->buf_addr = buf_addr + sg_used;
 630         }
 631 }
 632
 633 /**
 634  * xilinx_dma_get_metadata_ptr- Populate metadata pointer and payload length
 635  * @tx: async transaction descriptor
 636  * @payload_len: metadata payload length
 637  * @max_len: metadata max length
 638  * Return: The app field pointer.
 639  */
 640 static void *xilinx_dma_get_metadata_ptr(struct dma_async_tx_descriptor *tx,
 641                                          size_t *payload_len, size_t *max_len)
 642 {
 643         struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
 644         struct xilinx_axidma_tx_segment *seg;
 645
 646         *max_len = *payload_len = sizeof(u32) * XILINX_DMA_NUM_APP_WORDS;
 647         seg = list_first_entry(&desc->segments,
 648                                struct xilinx_axidma_tx_segment, node);
 649         return seg->hw.app;
 650 }
 651
 652 static struct dma_descriptor_metadata_ops xilinx_dma_metadata_ops = {
 653         .get_ptr = xilinx_dma_get_metadata_ptr,
 654 };
 655
 656 /* -----------------------------------------------------------------------------
 657  * Descriptors and segments alloc and free
 658  */
 659
 660 /**
 661  * xilinx_vdma_alloc_tx_segment - Allocate transaction segment
 662  * @chan: Driver specific DMA channel
 663  *
 664  * Return: The allocated segment on success and NULL on failure.
 665  */
 666 static struct xilinx_vdma_tx_segment *
 667 xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
 668 {
 669         struct xilinx_vdma_tx_segment *segment;
 670         dma_addr_t phys;
 671
 672         segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
 673         if (!segment)
 674                 return NULL;
 675
 676         segment->phys = phys;
 677
 678         return segment;
 679 }
 680
 681 /**
 682  * xilinx_cdma_alloc_tx_segment - Allocate transaction segment
 683  * @chan: Driver specific DMA channel
 684  *
 685  * Return: The allocated segment on success and NULL on failure.
 686  */
 687 static struct xilinx_cdma_tx_segment *
 688 xilinx_cdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
 689 {
 690         struct xilinx_cdma_tx_segment *segment;
 691         dma_addr_t phys;
 692
 693         segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
 694         if (!segment)
 695                 return NULL;
 696
 697         segment->phys = phys;
 698
 699         return segment;
 700 }
 701
 702 /**
 703  * xilinx_axidma_alloc_tx_segment - Allocate transaction segment
 704  * @chan: Driver specific DMA channel
 705  *
 706  * Return: The allocated segment on success and NULL on failure.
 707  */
 708 static struct xilinx_axidma_tx_segment *
 709 xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan)
 710 {
 711         struct xilinx_axidma_tx_segment *segment = NULL;
 712         unsigned long flags;
 713
 714         spin_lock_irqsave(&chan->lock, flags);
 715         if (!list_empty(&chan->free_seg_list)) {
 716                 segment = list_first_entry(&chan->free_seg_list,
 717                                            struct xilinx_axidma_tx_segment,
 718                                            node);
 719                 list_del(&segment->node);
 720         }
 721         spin_unlock_irqrestore(&chan->lock, flags);
 722
 723         if (!segment)
 724                 dev_dbg(chan->dev, "Could not find free tx segment\n");
 725
 726         return segment;
 727 }
 728
 729 /**
 730  * xilinx_aximcdma_alloc_tx_segment - Allocate transaction segment
 731  * @chan: Driver specific DMA channel
 732  *
 733  * Return: The allocated segment on success and NULL on failure.
 734  */
 735 static struct xilinx_aximcdma_tx_segment *
 736 xilinx_aximcdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
 737 {
 738         struct xilinx_aximcdma_tx_segment *segment = NULL;
 739         unsigned long flags;
 740
 741         spin_lock_irqsave(&chan->lock, flags);
 742         if (!list_empty(&chan->free_seg_list)) {
 743                 segment = list_first_entry(&chan->free_seg_list,
 744                                            struct xilinx_aximcdma_tx_segment,
 745                                            node);
 746                 list_del(&segment->node);
 747         }
 748         spin_unlock_irqrestore(&chan->lock, flags);
 749
 750         return segment;
 751 }
 752
 753 static void xilinx_dma_clean_hw_desc(struct xilinx_axidma_desc_hw *hw)
 754 {
 755         u32 next_desc = hw->next_desc;
 756         u32 next_desc_msb = hw->next_desc_msb;
 757
 758         memset(hw, 0, sizeof(struct xilinx_axidma_desc_hw));
 759
 760         hw->next_desc = next_desc;
 761         hw->next_desc_msb = next_desc_msb;
 762 }
 763
 764 static void xilinx_mcdma_clean_hw_desc(struct xilinx_aximcdma_desc_hw *hw)
 765 {
 766         u32 next_desc = hw->next_desc;
 767         u32 next_desc_msb = hw->next_desc_msb;
 768
 769         memset(hw, 0, sizeof(struct xilinx_aximcdma_desc_hw));
 770
 771         hw->next_desc = next_desc;
 772         hw->next_desc_msb = next_desc_msb;
 773 }
 774
 775 /**
 776  * xilinx_dma_free_tx_segment - Free transaction segment
 777  * @chan: Driver specific DMA channel
 778  * @segment: DMA transaction segment
 779  */
 780 static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan,
 781                                 struct xilinx_axidma_tx_segment *segment)
 782 {
 783         xilinx_dma_clean_hw_desc(&segment->hw);
 784
 785         list_add_tail(&segment->node, &chan->free_seg_list);
 786 }
 787
 788 /**
 789  * xilinx_mcdma_free_tx_segment - Free transaction segment
 790  * @chan: Driver specific DMA channel
 791  * @segment: DMA transaction segment
 792  */
 793 static void xilinx_mcdma_free_tx_segment(struct xilinx_dma_chan *chan,
 794                                          struct xilinx_aximcdma_tx_segment *
 795                                          segment)
 796 {
 797         xilinx_mcdma_clean_hw_desc(&segment->hw);
 798
 799         list_add_tail(&segment->node, &chan->free_seg_list);
 800 }
 801
 802 /**
 803  * xilinx_cdma_free_tx_segment - Free transaction segment
 804  * @chan: Driver specific DMA channel
 805  * @segment: DMA transaction segment
 806  */
 807 static void xilinx_cdma_free_tx_segment(struct xilinx_dma_chan *chan,
 808                                 struct xilinx_cdma_tx_segment *segment)
 809 {
 810         dma_pool_free(chan->desc_pool, segment, segment->phys);
 811 }
 812
 813 /**
 814  * xilinx_vdma_free_tx_segment - Free transaction segment
 815  * @chan: Driver specific DMA channel
 816  * @segment: DMA transaction segment
 817  */
 818 static void xilinx_vdma_free_tx_segment(struct xilinx_dma_chan *chan,
 819                                         struct xilinx_vdma_tx_segment *segment)
 820 {
 821         dma_pool_free(chan->desc_pool, segment, segment->phys);
 822 }
 823
 824 /**
 825  * xilinx_dma_alloc_tx_descriptor - Allocate transaction descriptor
 826  * @chan: Driver specific DMA channel
 827  *
 828  * Return: The allocated descriptor on success and NULL on failure.
 829  */
 830 static struct xilinx_dma_tx_descriptor *
 831 xilinx_dma_alloc_tx_descriptor(struct xilinx_dma_chan *chan)
 832 {
 833         struct xilinx_dma_tx_descriptor *desc;
 834
 835         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 836         if (!desc)
 837                 return NULL;
 838
 839         INIT_LIST_HEAD(&desc->segments);
 840
 841         return desc;
 842 }
 843
 844 /**
 845  * xilinx_dma_free_tx_descriptor - Free transaction descriptor
 846  * @chan: Driver specific DMA channel
 847  * @desc: DMA transaction descriptor
 848  */
 849 static void
 850 xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
 851                                struct xilinx_dma_tx_descriptor *desc)
 852 {
 853         struct xilinx_vdma_tx_segment *segment, *next;
 854         struct xilinx_cdma_tx_segment *cdma_segment, *cdma_next;
 855         struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next;
 856         struct xilinx_aximcdma_tx_segment *aximcdma_segment, *aximcdma_next;
 857
 858         if (!desc)
 859                 return;
 860
 861         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
 862                 list_for_each_entry_safe(segment, next, &desc->segments, node) {
 863                         list_del(&segment->node);
 864                         xilinx_vdma_free_tx_segment(chan, segment);
 865                 }
 866         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
 867                 list_for_each_entry_safe(cdma_segment, cdma_next,
 868                                          &desc->segments, node) {
 869                         list_del(&cdma_segment->node);
 870                         xilinx_cdma_free_tx_segment(chan, cdma_segment);
 871                 }
 872         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
 873                 list_for_each_entry_safe(axidma_segment, axidma_next,
 874                                          &desc->segments, node) {
 875                         list_del(&axidma_segment->node);
 876                         xilinx_dma_free_tx_segment(chan, axidma_segment);
 877                 }
 878         } else {
 879                 list_for_each_entry_safe(aximcdma_segment, aximcdma_next,
 880                                          &desc->segments, node) {
 881                         list_del(&aximcdma_segment->node);
 882                         xilinx_mcdma_free_tx_segment(chan, aximcdma_segment);
 883                 }
 884         }
 885
 886         kfree(desc);
 887 }
 888
 889 /* Required functions */
 890
 891 /**
 892  * xilinx_dma_free_desc_list - Free descriptors list
 893  * @chan: Driver specific DMA channel
 894  * @list: List to parse and delete the descriptor
 895  */
 896 static void xilinx_dma_free_desc_list(struct xilinx_dma_chan *chan,
 897                                         struct list_head *list)
 898 {
 899         struct xilinx_dma_tx_descriptor *desc, *next;
 900
 901         list_for_each_entry_safe(desc, next, list, node) {
 902                 list_del(&desc->node);
 903                 xilinx_dma_free_tx_descriptor(chan, desc);
 904         }
 905 }
 906
 907 /**
 908  * xilinx_dma_free_descriptors - Free channel descriptors
 909  * @chan: Driver specific DMA channel
 910  */
 911 static void xilinx_dma_free_descriptors(struct xilinx_dma_chan *chan)
 912 {
 913         unsigned long flags;
 914
 915         spin_lock_irqsave(&chan->lock, flags);
 916
 917         xilinx_dma_free_desc_list(chan, &chan->pending_list);
 918         xilinx_dma_free_desc_list(chan, &chan->done_list);
 919         xilinx_dma_free_desc_list(chan, &chan->active_list);
 920
 921         spin_unlock_irqrestore(&chan->lock, flags);
 922 }
 923
 924 /**
 925  * xilinx_dma_free_chan_resources - Free channel resources
 926  * @dchan: DMA channel
 927  */
 928 static void xilinx_dma_free_chan_resources(struct dma_chan *dchan)
 929 {
 930         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
 931         unsigned long flags;
 932
 933         dev_dbg(chan->dev, "Free all channel resources.\n");
 934
 935         xilinx_dma_free_descriptors(chan);
 936
 937         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
 938                 spin_lock_irqsave(&chan->lock, flags);
 939                 INIT_LIST_HEAD(&chan->free_seg_list);
 940                 spin_unlock_irqrestore(&chan->lock, flags);
 941
 942                 /* Free memory that is allocated for BD */
 943                 dma_free_coherent(chan->dev, sizeof(*chan->seg_v) *
 944                                   XILINX_DMA_NUM_DESCS, chan->seg_v,
 945                                   chan->seg_p);
 946
 947                 /* Free Memory that is allocated for cyclic DMA Mode */
 948                 dma_free_coherent(chan->dev, sizeof(*chan->cyclic_seg_v),
 949                                   chan->cyclic_seg_v, chan->cyclic_seg_p);
 950         }
 951
 952         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
 953                 spin_lock_irqsave(&chan->lock, flags);
 954                 INIT_LIST_HEAD(&chan->free_seg_list);
 955                 spin_unlock_irqrestore(&chan->lock, flags);
 956
 957                 /* Free memory that is allocated for BD */
 958                 dma_free_coherent(chan->dev, sizeof(*chan->seg_mv) *
 959                                   XILINX_DMA_NUM_DESCS, chan->seg_mv,
 960                                   chan->seg_p);
 961         }
 962
 963         if (chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA &&
 964             chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA) {
 965                 dma_pool_destroy(chan->desc_pool);
 966                 chan->desc_pool = NULL;
 967         }
 968
 969 }
 970
 971 /**
 972  * xilinx_dma_get_residue - Compute residue for a given descriptor
 973  * @chan: Driver specific dma channel
 974  * @desc: dma transaction descriptor
 975  *
 976  * Return: The number of residue bytes for the descriptor.
 977  */
 978 static u32 xilinx_dma_get_residue(struct xilinx_dma_chan *chan,
 979                                   struct xilinx_dma_tx_descriptor *desc)
 980 {
 981         struct xilinx_cdma_tx_segment *cdma_seg;
 982         struct xilinx_axidma_tx_segment *axidma_seg;
 983         struct xilinx_aximcdma_tx_segment *aximcdma_seg;
 984         struct xilinx_cdma_desc_hw *cdma_hw;
 985         struct xilinx_axidma_desc_hw *axidma_hw;
 986         struct xilinx_aximcdma_desc_hw *aximcdma_hw;
 987         struct list_head *entry;
 988         u32 residue = 0;
 989
 990         list_for_each(entry, &desc->segments) {
 991                 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
 992                         cdma_seg = list_entry(entry,
 993                                               struct xilinx_cdma_tx_segment,
 994                                               node);
 995                         cdma_hw = &cdma_seg->hw;
 996                         residue += (cdma_hw->control - cdma_hw->status) &
 997                                    chan->xdev->max_buffer_len;
 998                 } else if (chan->xdev->dma_config->dmatype ==
 999                            XDMA_TYPE_AXIDMA) {
1000                         axidma_seg = list_entry(entry,
1001                                                 struct xilinx_axidma_tx_segment,
1002                                                 node);
1003                         axidma_hw = &axidma_seg->hw;
1004                         residue += (axidma_hw->control - axidma_hw->status) &
1005                                    chan->xdev->max_buffer_len;
1006                 } else {
1007                         aximcdma_seg =
1008                                 list_entry(entry,
1009                                            struct xilinx_aximcdma_tx_segment,
1010                                            node);
1011                         aximcdma_hw = &aximcdma_seg->hw;
1012                         residue +=
1013                                 (aximcdma_hw->control - aximcdma_hw->status) &
1014                                 chan->xdev->max_buffer_len;
1015                 }
1016         }
1017
1018         return residue;
1019 }
1020
1021 /**
1022  * xilinx_dma_chan_handle_cyclic - Cyclic dma callback
1023  * @chan: Driver specific dma channel
1024  * @desc: dma transaction descriptor
1025  * @flags: flags for spin lock
1026  */
1027 static void xilinx_dma_chan_handle_cyclic(struct xilinx_dma_chan *chan,
1028                                           struct xilinx_dma_tx_descriptor *desc,
1029                                           unsigned long *flags)
1030 {
1031         struct dmaengine_desc_callback cb;
1032
1033         dmaengine_desc_get_callback(&desc->async_tx, &cb);
1034         if (dmaengine_desc_callback_valid(&cb)) {
1035                 spin_unlock_irqrestore(&chan->lock, *flags);
1036                 dmaengine_desc_callback_invoke(&cb, NULL);
1037                 spin_lock_irqsave(&chan->lock, *flags);
1038         }
1039 }
1040
1041 /**
1042  * xilinx_dma_chan_desc_cleanup - Clean channel descriptors
1043  * @chan: Driver specific DMA channel
1044  */
1045 static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan)
1046 {
1047         struct xilinx_dma_tx_descriptor *desc, *next;
1048         unsigned long flags;
1049
1050         spin_lock_irqsave(&chan->lock, flags);
1051
1052         list_for_each_entry_safe(desc, next, &chan->done_list, node) {
1053                 struct dmaengine_result result;
1054
1055                 if (desc->cyclic) {
1056                         xilinx_dma_chan_handle_cyclic(chan, desc, &flags);
1057                         break;
1058                 }
1059
1060                 /* Remove from the list of running transactions */
1061                 list_del(&desc->node);
1062
1063                 if (unlikely(desc->err)) {
1064                         if (chan->direction == DMA_DEV_TO_MEM)
1065                                 result.result = DMA_TRANS_READ_FAILED;
1066                         else
1067                                 result.result = DMA_TRANS_WRITE_FAILED;
1068                 } else {
1069                         result.result = DMA_TRANS_NOERROR;
1070                 }
1071
1072                 result.residue = desc->residue;
1073
1074                 /* Run the link descriptor callback function */
1075                 spin_unlock_irqrestore(&chan->lock, flags);
1076                 dmaengine_desc_get_callback_invoke(&desc->async_tx, &result);
1077                 spin_lock_irqsave(&chan->lock, flags);
1078
1079                 /* Run any dependencies, then free the descriptor */
1080                 dma_run_dependencies(&desc->async_tx);
1081                 xilinx_dma_free_tx_descriptor(chan, desc);
1082
1083                 /*
1084                  * While we ran a callback the user called a terminate function,
1085                  * which takes care of cleaning up any remaining descriptors
1086                  */
1087                 if (chan->terminating)
1088                         break;
1089         }
1090
1091         spin_unlock_irqrestore(&chan->lock, flags);
1092 }
1093
1094 /**
1095  * xilinx_dma_do_tasklet - Schedule completion tasklet
1096  * @t: Pointer to the Xilinx DMA channel structure
1097  */
1098 static void xilinx_dma_do_tasklet(struct tasklet_struct *t)
1099 {
1100         struct xilinx_dma_chan *chan = from_tasklet(chan, t, tasklet);
1101
1102         xilinx_dma_chan_desc_cleanup(chan);
1103 }
1104
1105 /**
1106  * xilinx_dma_alloc_chan_resources - Allocate channel resources
1107  * @dchan: DMA channel
1108  *
1109  * Return: '0' on success and failure value on error
1110  */
1111 static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
1112 {
1113         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
1114         int i;
1115
1116         /* Has this channel already been allocated? */
1117         if (chan->desc_pool)
1118                 return 0;
1119
1120         /*
1121          * We need the descriptor to be aligned to 64bytes
1122          * for meeting Xilinx VDMA specification requirement.
1123          */
1124         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
1125                 /* Allocate the buffer descriptors. */
1126                 chan->seg_v = dma_alloc_coherent(chan->dev,
1127                                                  sizeof(*chan->seg_v) * XILINX_DMA_NUM_DESCS,
1128                                                  &chan->seg_p, GFP_KERNEL);
1129                 if (!chan->seg_v) {
1130                         dev_err(chan->dev,
1131                                 "unable to allocate channel %d descriptors\n",
1132                                 chan->id);
1133                         return -ENOMEM;
1134                 }
1135                 /*
1136                  * For cyclic DMA mode we need to program the tail Descriptor
1137                  * register with a value which is not a part of the BD chain
1138                  * so allocating a desc segment during channel allocation for
1139                  * programming tail descriptor.
1140                  */
1141                 chan->cyclic_seg_v = dma_alloc_coherent(chan->dev,
1142                                                         sizeof(*chan->cyclic_seg_v),
1143                                                         &chan->cyclic_seg_p,
1144                                                         GFP_KERNEL);
1145                 if (!chan->cyclic_seg_v) {
1146                         dev_err(chan->dev,
1147                                 "unable to allocate desc segment for cyclic DMA\n");
1148                         dma_free_coherent(chan->dev, sizeof(*chan->seg_v) *
1149                                 XILINX_DMA_NUM_DESCS, chan->seg_v,
1150                                 chan->seg_p);
1151                         return -ENOMEM;
1152                 }
1153                 chan->cyclic_seg_v->phys = chan->cyclic_seg_p;
1154
1155                 for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) {
1156                         chan->seg_v[i].hw.next_desc =
1157                         lower_32_bits(chan->seg_p + sizeof(*chan->seg_v) *
1158                                 ((i + 1) % XILINX_DMA_NUM_DESCS));
1159                         chan->seg_v[i].hw.next_desc_msb =
1160                         upper_32_bits(chan->seg_p + sizeof(*chan->seg_v) *
1161                                 ((i + 1) % XILINX_DMA_NUM_DESCS));
1162                         chan->seg_v[i].phys = chan->seg_p +
1163                                 sizeof(*chan->seg_v) * i;
1164                         list_add_tail(&chan->seg_v[i].node,
1165                                       &chan->free_seg_list);
1166                 }
1167         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
1168                 /* Allocate the buffer descriptors. */
1169                 chan->seg_mv = dma_alloc_coherent(chan->dev,
1170                                                   sizeof(*chan->seg_mv) *
1171                                                   XILINX_DMA_NUM_DESCS,
1172                                                   &chan->seg_p, GFP_KERNEL);
1173                 if (!chan->seg_mv) {
1174                         dev_err(chan->dev,
1175                                 "unable to allocate channel %d descriptors\n",
1176                                 chan->id);
1177                         return -ENOMEM;
1178                 }
1179                 for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) {
1180                         chan->seg_mv[i].hw.next_desc =
1181                         lower_32_bits(chan->seg_p + sizeof(*chan->seg_mv) *
1182                                 ((i + 1) % XILINX_DMA_NUM_DESCS));
1183                         chan->seg_mv[i].hw.next_desc_msb =
1184                         upper_32_bits(chan->seg_p + sizeof(*chan->seg_mv) *
1185                                 ((i + 1) % XILINX_DMA_NUM_DESCS));
1186                         chan->seg_mv[i].phys = chan->seg_p +
1187                                 sizeof(*chan->seg_mv) * i;
1188                         list_add_tail(&chan->seg_mv[i].node,
1189                                       &chan->free_seg_list);
1190                 }
1191         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
1192                 chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool",
1193                                    chan->dev,
1194                                    sizeof(struct xilinx_cdma_tx_segment),
1195                                    __alignof__(struct xilinx_cdma_tx_segment),
1196                                    0);
1197         } else {
1198                 chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
1199                                      chan->dev,
1200                                      sizeof(struct xilinx_vdma_tx_segment),
1201                                      __alignof__(struct xilinx_vdma_tx_segment),
1202                                      0);
1203         }
1204
1205         if (!chan->desc_pool &&
1206             ((chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA) &&
1207                 chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA)) {
1208                 dev_err(chan->dev,
1209                         "unable to allocate channel %d descriptor pool\n",
1210                         chan->id);
1211                 return -ENOMEM;
1212         }
1213
1214         dma_cookie_init(dchan);
1215
1216         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
1217                 /* For AXI DMA resetting once channel will reset the
1218                  * other channel as well so enable the interrupts here.
1219                  */
1220                 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
1221                               XILINX_DMA_DMAXR_ALL_IRQ_MASK);
1222         }
1223
1224         if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
1225                 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
1226                              XILINX_CDMA_CR_SGMODE);
1227
1228         return 0;
1229 }
1230
1231 /**
1232  * xilinx_dma_calc_copysize - Calculate the amount of data to copy
1233  * @chan: Driver specific DMA channel
1234  * @size: Total data that needs to be copied
1235  * @done: Amount of data that has been already copied
1236  *
1237  * Return: Amount of data that has to be copied
1238  */
1239 static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan,
1240                                     int size, int done)
1241 {
1242         size_t copy;
1243
1244         copy = min_t(size_t, size - done,
1245                      chan->xdev->max_buffer_len);
1246
1247         if ((copy + done < size) &&
1248             chan->xdev->common.copy_align) {
1249                 /*
1250                  * If this is not the last descriptor, make sure
1251                  * the next one will be properly aligned
1252                  */
1253                 copy = rounddown(copy,
1254                                  (1 << chan->xdev->common.copy_align));
1255         }
1256         return copy;
1257 }
1258
1259 /**
1260  * xilinx_dma_tx_status - Get DMA transaction status
1261  * @dchan: DMA channel
1262  * @cookie: Transaction identifier
1263  * @txstate: Transaction state
1264  *
1265  * Return: DMA transaction status
1266  */
1267 static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
1268                                         dma_cookie_t cookie,
1269                                         struct dma_tx_state *txstate)
1270 {
1271         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
1272         struct xilinx_dma_tx_descriptor *desc;
1273         enum dma_status ret;
1274         unsigned long flags;
1275         u32 residue = 0;
1276
1277         ret = dma_cookie_status(dchan, cookie, txstate);
1278         if (ret == DMA_COMPLETE || !txstate)
1279                 return ret;
1280
1281         spin_lock_irqsave(&chan->lock, flags);
1282         if (!list_empty(&chan->active_list)) {
1283                 desc = list_last_entry(&chan->active_list,
1284                                        struct xilinx_dma_tx_descriptor, node);
1285                 /*
1286                  * VDMA and simple mode do not support residue reporting, so the
1287                  * residue field will always be 0.
1288                  */
1289                 if (chan->has_sg && chan->xdev->dma_config->dmatype != XDMA_TYPE_VDMA)
1290                         residue = xilinx_dma_get_residue(chan, desc);
1291         }
1292         spin_unlock_irqrestore(&chan->lock, flags);
1293
1294         dma_set_residue(txstate, residue);
1295
1296         return ret;
1297 }
1298
1299 /**
1300  * xilinx_dma_stop_transfer - Halt DMA channel
1301  * @chan: Driver specific DMA channel
1302  *
1303  * Return: '0' on success and failure value on error
1304  */
1305 static int xilinx_dma_stop_transfer(struct xilinx_dma_chan *chan)
1306 {
1307         u32 val;
1308
1309         dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
1310
1311         /* Wait for the hardware to halt */
1312         return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
1313                                        val & XILINX_DMA_DMASR_HALTED, 0,
1314                                        XILINX_DMA_LOOP_COUNT);
1315 }
1316
1317 /**
1318  * xilinx_cdma_stop_transfer - Wait for the current transfer to complete
1319  * @chan: Driver specific DMA channel
1320  *
1321  * Return: '0' on success and failure value on error
1322  */
1323 static int xilinx_cdma_stop_transfer(struct xilinx_dma_chan *chan)
1324 {
1325         u32 val;
1326
1327         return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
1328                                        val & XILINX_DMA_DMASR_IDLE, 0,
1329                                        XILINX_DMA_LOOP_COUNT);
1330 }
1331
1332 /**
1333  * xilinx_dma_start - Start DMA channel
1334  * @chan: Driver specific DMA channel
1335  */
1336 static void xilinx_dma_start(struct xilinx_dma_chan *chan)
1337 {
1338         int err;
1339         u32 val;
1340
1341         dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
1342
1343         /* Wait for the hardware to start */
1344         err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
1345                                       !(val & XILINX_DMA_DMASR_HALTED), 0,
1346                                       XILINX_DMA_LOOP_COUNT);
1347
1348         if (err) {
1349                 dev_err(chan->dev, "Cannot start channel %p: %x\n",
1350                         chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
1351
1352                 chan->err = true;
1353         }
1354 }
1355
1356 /**
1357  * xilinx_vdma_start_transfer - Starts VDMA transfer
1358  * @chan: Driver specific channel struct pointer
1359  */
1360 static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
1361 {
1362         struct xilinx_vdma_config *config = &chan->config;
1363         struct xilinx_dma_tx_descriptor *desc;
1364         u32 reg, j;
1365         struct xilinx_vdma_tx_segment *segment, *last = NULL;
1366         int i = 0;
1367
1368         /* This function was invoked with lock held */
1369         if (chan->err)
1370                 return;
1371
1372         if (!chan->idle)
1373                 return;
1374
1375         if (list_empty(&chan->pending_list))
1376                 return;
1377
1378         desc = list_first_entry(&chan->pending_list,
1379                                 struct xilinx_dma_tx_descriptor, node);
1380
1381         /* Configure the hardware using info in the config structure */
1382         if (chan->has_vflip) {
1383                 reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);
1384                 reg &= ~XILINX_VDMA_ENABLE_VERTICAL_FLIP;
1385                 reg |= config->vflip_en;
1386                 dma_write(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP,
1387                           reg);
1388         }
1389
1390         reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
1391
1392         if (config->frm_cnt_en)
1393                 reg |= XILINX_DMA_DMACR_FRAMECNT_EN;
1394         else
1395                 reg &= ~XILINX_DMA_DMACR_FRAMECNT_EN;
1396
1397         /* If not parking, enable circular mode */
1398         if (config->park)
1399                 reg &= ~XILINX_DMA_DMACR_CIRC_EN;
1400         else
1401                 reg |= XILINX_DMA_DMACR_CIRC_EN;
1402
1403         dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
1404
1405         j = chan->desc_submitcount;
1406         reg = dma_read(chan, XILINX_DMA_REG_PARK_PTR);
1407         if (chan->direction == DMA_MEM_TO_DEV) {
1408                 reg &= ~XILINX_DMA_PARK_PTR_RD_REF_MASK;
1409                 reg |= j << XILINX_DMA_PARK_PTR_RD_REF_SHIFT;
1410         } else {
1411                 reg &= ~XILINX_DMA_PARK_PTR_WR_REF_MASK;
1412                 reg |= j << XILINX_DMA_PARK_PTR_WR_REF_SHIFT;
1413         }
1414         dma_write(chan, XILINX_DMA_REG_PARK_PTR, reg);
1415
1416         /* Start the hardware */
1417         xilinx_dma_start(chan);
1418
1419         if (chan->err)
1420                 return;
1421
1422         /* Start the transfer */
1423         if (chan->desc_submitcount < chan->num_frms)
1424                 i = chan->desc_submitcount;
1425
1426         list_for_each_entry(segment, &desc->segments, node) {
1427                 if (chan->ext_addr)
1428                         vdma_desc_write_64(chan,
1429                                    XILINX_VDMA_REG_START_ADDRESS_64(i++),
1430                                    segment->hw.buf_addr,
1431                                    segment->hw.buf_addr_msb);
1432                 else
1433                         vdma_desc_write(chan,
1434                                         XILINX_VDMA_REG_START_ADDRESS(i++),
1435                                         segment->hw.buf_addr);
1436
1437                 last = segment;
1438         }
1439
1440         if (!last)
1441                 return;
1442
1443         /* HW expects these parameters to be same for one transaction */
1444         vdma_desc_write(chan, XILINX_DMA_REG_HSIZE, last->hw.hsize);
1445         vdma_desc_write(chan, XILINX_DMA_REG_FRMDLY_STRIDE,
1446                         last->hw.stride);
1447         vdma_desc_write(chan, XILINX_DMA_REG_VSIZE, last->hw.vsize);
1448
1449         chan->desc_submitcount++;
1450         chan->desc_pendingcount--;
1451         list_move_tail(&desc->node, &chan->active_list);
1452         if (chan->desc_submitcount == chan->num_frms)
1453                 chan->desc_submitcount = 0;
1454
1455         chan->idle = false;
1456 }
1457
1458 /**
1459  * xilinx_cdma_start_transfer - Starts cdma transfer
1460  * @chan: Driver specific channel struct pointer
1461  */
1462 static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan)
1463 {
1464         struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
1465         struct xilinx_cdma_tx_segment *tail_segment;
1466         u32 ctrl_reg = dma_read(chan, XILINX_DMA_REG_DMACR);
1467
1468         if (chan->err)
1469                 return;
1470
1471         if (!chan->idle)
1472                 return;
1473
1474         if (list_empty(&chan->pending_list))
1475                 return;
1476
1477         head_desc = list_first_entry(&chan->pending_list,
1478                                      struct xilinx_dma_tx_descriptor, node);
1479         tail_desc = list_last_entry(&chan->pending_list,
1480                                     struct xilinx_dma_tx_descriptor, node);
1481         tail_segment = list_last_entry(&tail_desc->segments,
1482                                        struct xilinx_cdma_tx_segment, node);
1483
1484         if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
1485                 ctrl_reg &= ~XILINX_DMA_CR_COALESCE_MAX;
1486                 ctrl_reg |= chan->desc_pendingcount <<
1487                                 XILINX_DMA_CR_COALESCE_SHIFT;
1488                 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, ctrl_reg);
1489         }
1490
1491         if (chan->has_sg) {
1492                 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
1493                              XILINX_CDMA_CR_SGMODE);
1494
1495                 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
1496                              XILINX_CDMA_CR_SGMODE);
1497
1498                 xilinx_write(chan, XILINX_DMA_REG_CURDESC,
1499                              head_desc->async_tx.phys);
1500
1501                 /* Update tail ptr register which will start the transfer */
1502                 xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
1503                              tail_segment->phys);
1504         } else {
1505                 /* In simple mode */
1506                 struct xilinx_cdma_tx_segment *segment;
1507                 struct xilinx_cdma_desc_hw *hw;
1508
1509                 segment = list_first_entry(&head_desc->segments,
1510                                            struct xilinx_cdma_tx_segment,
1511                                            node);
1512
1513                 hw = &segment->hw;
1514
1515                 xilinx_write(chan, XILINX_CDMA_REG_SRCADDR,
1516                              xilinx_prep_dma_addr_t(hw->src_addr));
1517                 xilinx_write(chan, XILINX_CDMA_REG_DSTADDR,
1518                              xilinx_prep_dma_addr_t(hw->dest_addr));
1519
1520                 /* Start the transfer */
1521                 dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
1522                                 hw->control & chan->xdev->max_buffer_len);
1523         }
1524
1525         list_splice_tail_init(&chan->pending_list, &chan->active_list);
1526         chan->desc_pendingcount = 0;
1527         chan->idle = false;
1528 }
1529
1530 /**
1531  * xilinx_dma_start_transfer - Starts DMA transfer
1532  * @chan: Driver specific channel struct pointer
1533  */
1534 static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
1535 {
1536         struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
1537         struct xilinx_axidma_tx_segment *tail_segment;
1538         u32 reg;
1539
1540         if (chan->err)
1541                 return;
1542
1543         if (list_empty(&chan->pending_list))
1544                 return;
1545
1546         if (!chan->idle)
1547                 return;
1548
1549         head_desc = list_first_entry(&chan->pending_list,
1550                                      struct xilinx_dma_tx_descriptor, node);
1551         tail_desc = list_last_entry(&chan->pending_list,
1552                                     struct xilinx_dma_tx_descriptor, node);
1553         tail_segment = list_last_entry(&tail_desc->segments,
1554                                        struct xilinx_axidma_tx_segment, node);
1555
1556         reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
1557
1558         if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
1559                 reg &= ~XILINX_DMA_CR_COALESCE_MAX;
1560                 reg |= chan->desc_pendingcount <<
1561                                   XILINX_DMA_CR_COALESCE_SHIFT;
1562                 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
1563         }
1564
1565         if (chan->has_sg)
1566                 xilinx_write(chan, XILINX_DMA_REG_CURDESC,
1567                              head_desc->async_tx.phys);
1568         reg  &= ~XILINX_DMA_CR_DELAY_MAX;
1569         reg  |= chan->irq_delay << XILINX_DMA_CR_DELAY_SHIFT;
1570         dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
1571
1572         xilinx_dma_start(chan);
1573
1574         if (chan->err)
1575                 return;
1576
1577         /* Start the transfer */
1578         if (chan->has_sg) {
1579                 if (chan->cyclic)
1580                         xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
1581                                      chan->cyclic_seg_v->phys);
1582                 else
1583                         xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
1584                                      tail_segment->phys);
1585         } else {
1586                 struct xilinx_axidma_tx_segment *segment;
1587                 struct xilinx_axidma_desc_hw *hw;
1588
1589                 segment = list_first_entry(&head_desc->segments,
1590                                            struct xilinx_axidma_tx_segment,
1591                                            node);
1592                 hw = &segment->hw;
1593
1594                 xilinx_write(chan, XILINX_DMA_REG_SRCDSTADDR,
1595                              xilinx_prep_dma_addr_t(hw->buf_addr));
1596
1597                 /* Start the transfer */
1598                 dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
1599                                hw->control & chan->xdev->max_buffer_len);
1600         }
1601
1602         list_splice_tail_init(&chan->pending_list, &chan->active_list);
1603         chan->desc_pendingcount = 0;
1604         chan->idle = false;
1605 }
1606
1607 /**
1608  * xilinx_mcdma_start_transfer - Starts MCDMA transfer
1609  * @chan: Driver specific channel struct pointer
1610  */
1611 static void xilinx_mcdma_start_transfer(struct xilinx_dma_chan *chan)
1612 {
1613         struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
1614         struct xilinx_aximcdma_tx_segment *tail_segment;
1615         u32 reg;
1616
1617         /*
1618          * lock has been held by calling functions, so we don't need it
1619          * to take it here again.
1620          */
1621
1622         if (chan->err)
1623                 return;
1624
1625         if (!chan->idle)
1626                 return;
1627
1628         if (list_empty(&chan->pending_list))
1629                 return;
1630
1631         head_desc = list_first_entry(&chan->pending_list,
1632                                      struct xilinx_dma_tx_descriptor, node);
1633         tail_desc = list_last_entry(&chan->pending_list,
1634                                     struct xilinx_dma_tx_descriptor, node);
1635         tail_segment = list_last_entry(&tail_desc->segments,
1636                                        struct xilinx_aximcdma_tx_segment, node);
1637
1638         reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest));
1639
1640         if (chan->desc_pendingcount <= XILINX_MCDMA_COALESCE_MAX) {
1641                 reg &= ~XILINX_MCDMA_COALESCE_MASK;
1642                 reg |= chan->desc_pendingcount <<
1643                         XILINX_MCDMA_COALESCE_SHIFT;
1644         }
1645
1646         reg |= XILINX_MCDMA_IRQ_ALL_MASK;
1647         dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg);
1648
1649         /* Program current descriptor */
1650         xilinx_write(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET(chan->tdest),
1651                      head_desc->async_tx.phys);
1652
1653         /* Program channel enable register */
1654         reg = dma_ctrl_read(chan, XILINX_MCDMA_CHEN_OFFSET);
1655         reg |= BIT(chan->tdest);
1656         dma_ctrl_write(chan, XILINX_MCDMA_CHEN_OFFSET, reg);
1657
1658         /* Start the fetch of BDs for the channel */
1659         reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest));
1660         reg |= XILINX_MCDMA_CR_RUNSTOP_MASK;
1661         dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg);
1662
1663         xilinx_dma_start(chan);
1664
1665         if (chan->err)
1666                 return;
1667
1668         /* Start the transfer */
1669         xilinx_write(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET(chan->tdest),
1670                      tail_segment->phys);
1671
1672         list_splice_tail_init(&chan->pending_list, &chan->active_list);
1673         chan->desc_pendingcount = 0;
1674         chan->idle = false;
1675 }
1676
1677 /**
1678  * xilinx_dma_issue_pending - Issue pending transactions
1679  * @dchan: DMA channel
1680  */
1681 static void xilinx_dma_issue_pending(struct dma_chan *dchan)
1682 {
1683         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
1684         unsigned long flags;
1685
1686         spin_lock_irqsave(&chan->lock, flags);
1687         chan->start_transfer(chan);
1688         spin_unlock_irqrestore(&chan->lock, flags);
1689 }
1690
1691 /**
1692  * xilinx_dma_device_config - Configure the DMA channel
1693  * @dchan: DMA channel
1694  * @config: channel configuration
1695  *
1696  * Return: 0 always.
1697  */
1698 static int xilinx_dma_device_config(struct dma_chan *dchan,
1699                                     struct dma_slave_config *config)
1700 {
1701         return 0;
1702 }
1703
1704 /**
1705  * xilinx_dma_complete_descriptor - Mark the active descriptor as complete
1706  * @chan : xilinx DMA channel
1707  *
1708  * CONTEXT: hardirq
1709  */
1710 static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan)
1711 {
1712         struct xilinx_dma_tx_descriptor *desc, *next;
1713
1714         /* This function was invoked with lock held */
1715         if (list_empty(&chan->active_list))
1716                 return;
1717
1718         list_for_each_entry_safe(desc, next, &chan->active_list, node) {
1719                 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
1720                         struct xilinx_axidma_tx_segment *seg;
1721
1722                         seg = list_last_entry(&desc->segments,
1723                                               struct xilinx_axidma_tx_segment, node);
1724                         if (!(seg->hw.status & XILINX_DMA_BD_COMP_MASK) && chan->has_sg)
1725                                 break;
1726                 }
1727                 if (chan->has_sg && chan->xdev->dma_config->dmatype !=
1728                     XDMA_TYPE_VDMA)
1729                         desc->residue = xilinx_dma_get_residue(chan, desc);
1730                 else
1731                         desc->residue = 0;
1732                 desc->err = chan->err;
1733
1734                 list_del(&desc->node);
1735                 if (!desc->cyclic)
1736                         dma_cookie_complete(&desc->async_tx);
1737                 list_add_tail(&desc->node, &chan->done_list);
1738         }
1739 }
1740
1741 /**
1742  * xilinx_dma_reset - Reset DMA channel
1743  * @chan: Driver specific DMA channel
1744  *
1745  * Return: '0' on success and failure value on error
1746  */
1747 static int xilinx_dma_reset(struct xilinx_dma_chan *chan)
1748 {
1749         int err;
1750         u32 tmp;
1751
1752         dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RESET);
1753
1754         /* Wait for the hardware to finish reset */
1755         err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMACR, tmp,
1756                                       !(tmp & XILINX_DMA_DMACR_RESET), 0,
1757                                       XILINX_DMA_LOOP_COUNT);
1758
1759         if (err) {
1760                 dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
1761                         dma_ctrl_read(chan, XILINX_DMA_REG_DMACR),
1762                         dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
1763                 return -ETIMEDOUT;
1764         }
1765
1766         chan->err = false;
1767         chan->idle = true;
1768         chan->desc_pendingcount = 0;
1769         chan->desc_submitcount = 0;
1770
1771         return err;
1772 }
1773
1774 /**
1775  * xilinx_dma_chan_reset - Reset DMA channel and enable interrupts
1776  * @chan: Driver specific DMA channel
1777  *
1778  * Return: '0' on success and failure value on error
1779  */
1780 static int xilinx_dma_chan_reset(struct xilinx_dma_chan *chan)
1781 {
1782         int err;
1783
1784         /* Reset VDMA */
1785         err = xilinx_dma_reset(chan);
1786         if (err)
1787                 return err;
1788
1789         /* Enable interrupts */
1790         dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
1791                       XILINX_DMA_DMAXR_ALL_IRQ_MASK);
1792
1793         return 0;
1794 }
1795
1796 /**
1797  * xilinx_mcdma_irq_handler - MCDMA Interrupt handler
1798  * @irq: IRQ number
1799  * @data: Pointer to the Xilinx MCDMA channel structure
1800  *
1801  * Return: IRQ_HANDLED/IRQ_NONE
1802  */
1803 static irqreturn_t xilinx_mcdma_irq_handler(int irq, void *data)
1804 {
1805         struct xilinx_dma_chan *chan = data;
1806         u32 status, ser_offset, chan_sermask, chan_offset = 0, chan_id;
1807
1808         if (chan->direction == DMA_DEV_TO_MEM)
1809                 ser_offset = XILINX_MCDMA_RXINT_SER_OFFSET;
1810         else
1811                 ser_offset = XILINX_MCDMA_TXINT_SER_OFFSET;
1812
1813         /* Read the channel id raising the interrupt*/
1814         chan_sermask = dma_ctrl_read(chan, ser_offset);
1815         chan_id = ffs(chan_sermask);
1816
1817         if (!chan_id)
1818                 return IRQ_NONE;
1819
1820         if (chan->direction == DMA_DEV_TO_MEM)
1821                 chan_offset = chan->xdev->dma_config->max_channels / 2;
1822
1823         chan_offset = chan_offset + (chan_id - 1);
1824         chan = chan->xdev->chan[chan_offset];
1825         /* Read the status and ack the interrupts. */
1826         status = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest));
1827         if (!(status & XILINX_MCDMA_IRQ_ALL_MASK))
1828                 return IRQ_NONE;
1829
1830         dma_ctrl_write(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest),
1831                        status & XILINX_MCDMA_IRQ_ALL_MASK);
1832
1833         if (status & XILINX_MCDMA_IRQ_ERR_MASK) {
1834                 dev_err(chan->dev, "Channel %p has errors %x cdr %x tdr %x\n",
1835                         chan,
1836                         dma_ctrl_read(chan, XILINX_MCDMA_CH_ERR_OFFSET),
1837                         dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET
1838                                       (chan->tdest)),
1839                         dma_ctrl_read(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET
1840                                       (chan->tdest)));
1841                 chan->err = true;
1842         }
1843
1844         if (status & XILINX_MCDMA_IRQ_DELAY_MASK) {
1845                 /*
1846                  * Device takes too long to do the transfer when user requires
1847                  * responsiveness.
1848                  */
1849                 dev_dbg(chan->dev, "Inter-packet latency too long\n");
1850         }
1851
1852         if (status & XILINX_MCDMA_IRQ_IOC_MASK) {
1853                 spin_lock(&chan->lock);
1854                 xilinx_dma_complete_descriptor(chan);
1855                 chan->idle = true;
1856                 chan->start_transfer(chan);
1857                 spin_unlock(&chan->lock);
1858         }
1859
1860         tasklet_hi_schedule(&chan->tasklet);
1861         return IRQ_HANDLED;
1862 }
1863
1864 /**
1865  * xilinx_dma_irq_handler - DMA Interrupt handler
1866  * @irq: IRQ number
1867  * @data: Pointer to the Xilinx DMA channel structure
1868  *
1869  * Return: IRQ_HANDLED/IRQ_NONE
1870  */
1871 static irqreturn_t xilinx_dma_irq_handler(int irq, void *data)
1872 {
1873         struct xilinx_dma_chan *chan = data;
1874         u32 status;
1875
1876         /* Read the status and ack the interrupts. */
1877         status = dma_ctrl_read(chan, XILINX_DMA_REG_DMASR);
1878         if (!(status & XILINX_DMA_DMAXR_ALL_IRQ_MASK))
1879                 return IRQ_NONE;
1880
1881         dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
1882                         status & XILINX_DMA_DMAXR_ALL_IRQ_MASK);
1883
1884         if (status & XILINX_DMA_DMASR_ERR_IRQ) {
1885                 /*
1886                  * An error occurred. If C_FLUSH_ON_FSYNC is enabled and the
1887                  * error is recoverable, ignore it. Otherwise flag the error.
1888                  *
1889                  * Only recoverable errors can be cleared in the DMASR register,
1890                  * make sure not to write to other error bits to 1.
1891                  */
1892                 u32 errors = status & XILINX_DMA_DMASR_ALL_ERR_MASK;
1893
1894                 dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
1895                                 errors & XILINX_DMA_DMASR_ERR_RECOVER_MASK);
1896
1897                 if (!chan->flush_on_fsync ||
1898                     (errors & ~XILINX_DMA_DMASR_ERR_RECOVER_MASK)) {
1899                         dev_err(chan->dev,
1900                                 "Channel %p has errors %x, cdr %x tdr %x\n",
1901                                 chan, errors,
1902                                 dma_ctrl_read(chan, XILINX_DMA_REG_CURDESC),
1903                                 dma_ctrl_read(chan, XILINX_DMA_REG_TAILDESC));
1904                         chan->err = true;
1905                 }
1906         }
1907
1908         if (status & (XILINX_DMA_DMASR_FRM_CNT_IRQ |
1909                       XILINX_DMA_DMASR_DLY_CNT_IRQ)) {
1910                 spin_lock(&chan->lock);
1911                 xilinx_dma_complete_descriptor(chan);
1912                 chan->idle = true;
1913                 chan->start_transfer(chan);
1914                 spin_unlock(&chan->lock);
1915         }
1916
1917         tasklet_schedule(&chan->tasklet);
1918         return IRQ_HANDLED;
1919 }
1920
1921 /**
1922  * append_desc_queue - Queuing descriptor
1923  * @chan: Driver specific dma channel
1924  * @desc: dma transaction descriptor
1925  */
1926 static void append_desc_queue(struct xilinx_dma_chan *chan,
1927                               struct xilinx_dma_tx_descriptor *desc)
1928 {
1929         struct xilinx_vdma_tx_segment *tail_segment;
1930         struct xilinx_dma_tx_descriptor *tail_desc;
1931         struct xilinx_axidma_tx_segment *axidma_tail_segment;
1932         struct xilinx_aximcdma_tx_segment *aximcdma_tail_segment;
1933         struct xilinx_cdma_tx_segment *cdma_tail_segment;
1934
1935         if (list_empty(&chan->pending_list))
1936                 goto append;
1937
1938         /*
1939          * Add the hardware descriptor to the chain of hardware descriptors
1940          * that already exists in memory.
1941          */
1942         tail_desc = list_last_entry(&chan->pending_list,
1943                                     struct xilinx_dma_tx_descriptor, node);
1944         if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
1945                 tail_segment = list_last_entry(&tail_desc->segments,
1946                                                struct xilinx_vdma_tx_segment,
1947                                                node);
1948                 tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
1949         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
1950                 cdma_tail_segment = list_last_entry(&tail_desc->segments,
1951                                                 struct xilinx_cdma_tx_segment,
1952                                                 node);
1953                 cdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
1954         } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
1955                 axidma_tail_segment = list_last_entry(&tail_desc->segments,
1956                                                struct xilinx_axidma_tx_segment,
1957                                                node);
1958                 axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
1959         } else {
1960                 aximcdma_tail_segment =
1961                         list_last_entry(&tail_desc->segments,
1962                                         struct xilinx_aximcdma_tx_segment,
1963                                         node);
1964                 aximcdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
1965         }
1966
1967         /*
1968          * Add the software descriptor and all children to the list
1969          * of pending transactions
1970          */
1971 append:
1972         list_add_tail(&desc->node, &chan->pending_list);
1973         chan->desc_pendingcount++;
1974
1975         if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA)
1976             && unlikely(chan->desc_pendingcount > chan->num_frms)) {
1977                 dev_dbg(chan->dev, "desc pendingcount is too high\n");
1978                 chan->desc_pendingcount = chan->num_frms;
1979         }
1980 }
1981
1982 /**
1983  * xilinx_dma_tx_submit - Submit DMA transaction
1984  * @tx: Async transaction descriptor
1985  *
1986  * Return: cookie value on success and failure value on error
1987  */
1988 static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
1989 {
1990         struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
1991         struct xilinx_dma_chan *chan = to_xilinx_chan(tx->chan);
1992         dma_cookie_t cookie;
1993         unsigned long flags;
1994         int err;
1995
1996         if (chan->cyclic) {
1997                 xilinx_dma_free_tx_descriptor(chan, desc);
1998                 return -EBUSY;
1999         }
2000
2001         if (chan->err) {
2002                 /*
2003                  * If reset fails, need to hard reset the system.
2004                  * Channel is no longer functional
2005                  */
2006                 err = xilinx_dma_chan_reset(chan);
2007                 if (err < 0)
2008                         return err;
2009         }
2010
2011         spin_lock_irqsave(&chan->lock, flags);
2012
2013         cookie = dma_cookie_assign(tx);
2014
2015         /* Put this transaction onto the tail of the pending queue */
2016         append_desc_queue(chan, desc);
2017
2018         if (desc->cyclic)
2019                 chan->cyclic = true;
2020
2021         chan->terminating = false;
2022
2023         spin_unlock_irqrestore(&chan->lock, flags);
2024
2025         return cookie;
2026 }
2027
2028 /**
2029  * xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a
2030  *      DMA_SLAVE transaction
2031  * @dchan: DMA channel
2032  * @xt: Interleaved template pointer
2033  * @flags: transfer ack flags
2034  *
2035  * Return: Async transaction descriptor on success and NULL on failure
2036  */
2037 static struct dma_async_tx_descriptor *
2038 xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
2039                                  struct dma_interleaved_template *xt,
2040                                  unsigned long flags)
2041 {
2042         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2043         struct xilinx_dma_tx_descriptor *desc;
2044         struct xilinx_vdma_tx_segment *segment;
2045         struct xilinx_vdma_desc_hw *hw;
2046
2047         if (!is_slave_direction(xt->dir))
2048                 return NULL;
2049
2050         if (!xt->numf || !xt->sgl[0].size)
2051                 return NULL;
2052
2053         if (xt->frame_size != 1)
2054                 return NULL;
2055
2056         /* Allocate a transaction descriptor. */
2057         desc = xilinx_dma_alloc_tx_descriptor(chan);
2058         if (!desc)
2059                 return NULL;
2060
2061         dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
2062         desc->async_tx.tx_submit = xilinx_dma_tx_submit;
2063         async_tx_ack(&desc->async_tx);
2064
2065         /* Allocate the link descriptor from DMA pool */
2066         segment = xilinx_vdma_alloc_tx_segment(chan);
2067         if (!segment)
2068                 goto error;
2069
2070         /* Fill in the hardware descriptor */
2071         hw = &segment->hw;
2072         hw->vsize = xt->numf;
2073         hw->hsize = xt->sgl[0].size;
2074         hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) <<
2075                         XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT;
2076         hw->stride |= chan->config.frm_dly <<
2077                         XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT;
2078
2079         if (xt->dir != DMA_MEM_TO_DEV) {
2080                 if (chan->ext_addr) {
2081                         hw->buf_addr = lower_32_bits(xt->dst_start);
2082                         hw->buf_addr_msb = upper_32_bits(xt->dst_start);
2083                 } else {
2084                         hw->buf_addr = xt->dst_start;
2085                 }
2086         } else {
2087                 if (chan->ext_addr) {
2088                         hw->buf_addr = lower_32_bits(xt->src_start);
2089                         hw->buf_addr_msb = upper_32_bits(xt->src_start);
2090                 } else {
2091                         hw->buf_addr = xt->src_start;
2092                 }
2093         }
2094
2095         /* Insert the segment into the descriptor segments list. */
2096         list_add_tail(&segment->node, &desc->segments);
2097
2098         /* Link the last hardware descriptor with the first. */
2099         segment = list_first_entry(&desc->segments,
2100                                    struct xilinx_vdma_tx_segment, node);
2101         desc->async_tx.phys = segment->phys;
2102
2103         return &desc->async_tx;
2104
2105 error:
2106         xilinx_dma_free_tx_descriptor(chan, desc);
2107         return NULL;
2108 }
2109
2110 /**
2111  * xilinx_cdma_prep_memcpy - prepare descriptors for a memcpy transaction
2112  * @dchan: DMA channel
2113  * @dma_dst: destination address
2114  * @dma_src: source address
2115  * @len: transfer length
2116  * @flags: transfer ack flags
2117  *
2118  * Return: Async transaction descriptor on success and NULL on failure
2119  */
2120 static struct dma_async_tx_descriptor *
2121 xilinx_cdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
2122                         dma_addr_t dma_src, size_t len, unsigned long flags)
2123 {
2124         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2125         struct xilinx_dma_tx_descriptor *desc;
2126         struct xilinx_cdma_tx_segment *segment;
2127         struct xilinx_cdma_desc_hw *hw;
2128
2129         if (!len || len > chan->xdev->max_buffer_len)
2130                 return NULL;
2131
2132         desc = xilinx_dma_alloc_tx_descriptor(chan);
2133         if (!desc)
2134                 return NULL;
2135
2136         dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
2137         desc->async_tx.tx_submit = xilinx_dma_tx_submit;
2138
2139         /* Allocate the link descriptor from DMA pool */
2140         segment = xilinx_cdma_alloc_tx_segment(chan);
2141         if (!segment)
2142                 goto error;
2143
2144         hw = &segment->hw;
2145         hw->control = len;
2146         hw->src_addr = dma_src;
2147         hw->dest_addr = dma_dst;
2148         if (chan->ext_addr) {
2149                 hw->src_addr_msb = upper_32_bits(dma_src);
2150                 hw->dest_addr_msb = upper_32_bits(dma_dst);
2151         }
2152
2153         /* Insert the segment into the descriptor segments list. */
2154         list_add_tail(&segment->node, &desc->segments);
2155
2156         desc->async_tx.phys = segment->phys;
2157         hw->next_desc = segment->phys;
2158
2159         return &desc->async_tx;
2160
2161 error:
2162         xilinx_dma_free_tx_descriptor(chan, desc);
2163         return NULL;
2164 }
2165
2166 /**
2167  * xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
2168  * @dchan: DMA channel
2169  * @sgl: scatterlist to transfer to/from
2170  * @sg_len: number of entries in @scatterlist
2171  * @direction: DMA direction
2172  * @flags: transfer ack flags
2173  * @context: APP words of the descriptor
2174  *
2175  * Return: Async transaction descriptor on success and NULL on failure
2176  */
2177 static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
2178         struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
2179         enum dma_transfer_direction direction, unsigned long flags,
2180         void *context)
2181 {
2182         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2183         struct xilinx_dma_tx_descriptor *desc;
2184         struct xilinx_axidma_tx_segment *segment = NULL;
2185         u32 *app_w = (u32 *)context;
2186         struct scatterlist *sg;
2187         size_t copy;
2188         size_t sg_used;
2189         unsigned int i;
2190
2191         if (!is_slave_direction(direction))
2192                 return NULL;
2193
2194         /* Allocate a transaction descriptor. */
2195         desc = xilinx_dma_alloc_tx_descriptor(chan);
2196         if (!desc)
2197                 return NULL;
2198
2199         dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
2200         desc->async_tx.tx_submit = xilinx_dma_tx_submit;
2201
2202         /* Build transactions using information in the scatter gather list */
2203         for_each_sg(sgl, sg, sg_len, i) {
2204                 sg_used = 0;
2205
2206                 /* Loop until the entire scatterlist entry is used */
2207                 while (sg_used < sg_dma_len(sg)) {
2208                         struct xilinx_axidma_desc_hw *hw;
2209
2210                         /* Get a free segment */
2211                         segment = xilinx_axidma_alloc_tx_segment(chan);
2212                         if (!segment)
2213                                 goto error;
2214
2215                         /*
2216                          * Calculate the maximum number of bytes to transfer,
2217                          * making sure it is less than the hw limit
2218                          */
2219                         copy = xilinx_dma_calc_copysize(chan, sg_dma_len(sg),
2220                                                         sg_used);
2221                         hw = &segment->hw;
2222
2223                         /* Fill in the descriptor */
2224                         xilinx_axidma_buf(chan, hw, sg_dma_address(sg),
2225                                           sg_used, 0);
2226
2227                         hw->control = copy;
2228
2229                         if (chan->direction == DMA_MEM_TO_DEV) {
2230                                 if (app_w)
2231                                         memcpy(hw->app, app_w, sizeof(u32) *
2232                                                XILINX_DMA_NUM_APP_WORDS);
2233                         }
2234
2235                         sg_used += copy;
2236
2237                         /*
2238                          * Insert the segment into the descriptor segments
2239                          * list.
2240                          */
2241                         list_add_tail(&segment->node, &desc->segments);
2242                 }
2243         }
2244
2245         segment = list_first_entry(&desc->segments,
2246                                    struct xilinx_axidma_tx_segment, node);
2247         desc->async_tx.phys = segment->phys;
2248
2249         /* For the last DMA_MEM_TO_DEV transfer, set EOP */
2250         if (chan->direction == DMA_MEM_TO_DEV) {
2251                 segment->hw.control |= XILINX_DMA_BD_SOP;
2252                 segment = list_last_entry(&desc->segments,
2253                                           struct xilinx_axidma_tx_segment,
2254                                           node);
2255                 segment->hw.control |= XILINX_DMA_BD_EOP;
2256         }
2257
2258         if (chan->xdev->has_axistream_connected)
2259                 desc->async_tx.metadata_ops = &xilinx_dma_metadata_ops;
2260
2261         return &desc->async_tx;
2262
2263 error:
2264         xilinx_dma_free_tx_descriptor(chan, desc);
2265         return NULL;
2266 }
2267
2268 /**
2269  * xilinx_dma_prep_dma_cyclic - prepare descriptors for a DMA_SLAVE transaction
2270  * @dchan: DMA channel
2271  * @buf_addr: Physical address of the buffer
2272  * @buf_len: Total length of the cyclic buffers
2273  * @period_len: length of individual cyclic buffer
2274  * @direction: DMA direction
2275  * @flags: transfer ack flags
2276  *
2277  * Return: Async transaction descriptor on success and NULL on failure
2278  */
2279 static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic(
2280         struct dma_chan *dchan, dma_addr_t buf_addr, size_t buf_len,
2281         size_t period_len, enum dma_transfer_direction direction,
2282         unsigned long flags)
2283 {
2284         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2285         struct xilinx_dma_tx_descriptor *desc;
2286         struct xilinx_axidma_tx_segment *segment, *head_segment, *prev = NULL;
2287         size_t copy, sg_used;
2288         unsigned int num_periods;
2289         int i;
2290         u32 reg;
2291
2292         if (!period_len)
2293                 return NULL;
2294
2295         num_periods = buf_len / period_len;
2296
2297         if (!num_periods)
2298                 return NULL;
2299
2300         if (!is_slave_direction(direction))
2301                 return NULL;
2302
2303         /* Allocate a transaction descriptor. */
2304         desc = xilinx_dma_alloc_tx_descriptor(chan);
2305         if (!desc)
2306                 return NULL;
2307
2308         chan->direction = direction;
2309         dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
2310         desc->async_tx.tx_submit = xilinx_dma_tx_submit;
2311
2312         for (i = 0; i < num_periods; ++i) {
2313                 sg_used = 0;
2314
2315                 while (sg_used < period_len) {
2316                         struct xilinx_axidma_desc_hw *hw;
2317
2318                         /* Get a free segment */
2319                         segment = xilinx_axidma_alloc_tx_segment(chan);
2320                         if (!segment)
2321                                 goto error;
2322
2323                         /*
2324                          * Calculate the maximum number of bytes to transfer,
2325                          * making sure it is less than the hw limit
2326                          */
2327                         copy = xilinx_dma_calc_copysize(chan, period_len,
2328                                                         sg_used);
2329                         hw = &segment->hw;
2330                         xilinx_axidma_buf(chan, hw, buf_addr, sg_used,
2331                                           period_len * i);
2332                         hw->control = copy;
2333
2334                         if (prev)
2335                                 prev->hw.next_desc = segment->phys;
2336
2337                         prev = segment;
2338                         sg_used += copy;
2339
2340                         /*
2341                          * Insert the segment into the descriptor segments
2342                          * list.
2343                          */
2344                         list_add_tail(&segment->node, &desc->segments);
2345                 }
2346         }
2347
2348         head_segment = list_first_entry(&desc->segments,
2349                                    struct xilinx_axidma_tx_segment, node);
2350         desc->async_tx.phys = head_segment->phys;
2351
2352         desc->cyclic = true;
2353         reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
2354         reg |= XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
2355         dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
2356
2357         segment = list_last_entry(&desc->segments,
2358                                   struct xilinx_axidma_tx_segment,
2359                                   node);
2360         segment->hw.next_desc = (u32) head_segment->phys;
2361
2362         /* For the last DMA_MEM_TO_DEV transfer, set EOP */
2363         if (direction == DMA_MEM_TO_DEV) {
2364                 head_segment->hw.control |= XILINX_DMA_BD_SOP;
2365                 segment->hw.control |= XILINX_DMA_BD_EOP;
2366         }
2367
2368         return &desc->async_tx;
2369
2370 error:
2371         xilinx_dma_free_tx_descriptor(chan, desc);
2372         return NULL;
2373 }
2374
2375 /**
2376  * xilinx_mcdma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
2377  * @dchan: DMA channel
2378  * @sgl: scatterlist to transfer to/from
2379  * @sg_len: number of entries in @scatterlist
2380  * @direction: DMA direction
2381  * @flags: transfer ack flags
2382  * @context: APP words of the descriptor
2383  *
2384  * Return: Async transaction descriptor on success and NULL on failure
2385  */
2386 static struct dma_async_tx_descriptor *
2387 xilinx_mcdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
2388                            unsigned int sg_len,
2389                            enum dma_transfer_direction direction,
2390                            unsigned long flags, void *context)
2391 {
2392         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2393         struct xilinx_dma_tx_descriptor *desc;
2394         struct xilinx_aximcdma_tx_segment *segment = NULL;
2395         u32 *app_w = (u32 *)context;
2396         struct scatterlist *sg;
2397         size_t copy;
2398         size_t sg_used;
2399         unsigned int i;
2400
2401         if (!is_slave_direction(direction))
2402                 return NULL;
2403
2404         /* Allocate a transaction descriptor. */
2405         desc = xilinx_dma_alloc_tx_descriptor(chan);
2406         if (!desc)
2407                 return NULL;
2408
2409         dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
2410         desc->async_tx.tx_submit = xilinx_dma_tx_submit;
2411
2412         /* Build transactions using information in the scatter gather list */
2413         for_each_sg(sgl, sg, sg_len, i) {
2414                 sg_used = 0;
2415
2416                 /* Loop until the entire scatterlist entry is used */
2417                 while (sg_used < sg_dma_len(sg)) {
2418                         struct xilinx_aximcdma_desc_hw *hw;
2419
2420                         /* Get a free segment */
2421                         segment = xilinx_aximcdma_alloc_tx_segment(chan);
2422                         if (!segment)
2423                                 goto error;
2424
2425                         /*
2426                          * Calculate the maximum number of bytes to transfer,
2427                          * making sure it is less than the hw limit
2428                          */
2429                         copy = min_t(size_t, sg_dma_len(sg) - sg_used,
2430                                      chan->xdev->max_buffer_len);
2431                         hw = &segment->hw;
2432
2433                         /* Fill in the descriptor */
2434                         xilinx_aximcdma_buf(chan, hw, sg_dma_address(sg),
2435                                             sg_used);
2436                         hw->control = copy;
2437
2438                         if (chan->direction == DMA_MEM_TO_DEV && app_w) {
2439                                 memcpy(hw->app, app_w, sizeof(u32) *
2440                                        XILINX_DMA_NUM_APP_WORDS);
2441                         }
2442
2443                         sg_used += copy;
2444                         /*
2445                          * Insert the segment into the descriptor segments
2446                          * list.
2447                          */
2448                         list_add_tail(&segment->node, &desc->segments);
2449                 }
2450         }
2451
2452         segment = list_first_entry(&desc->segments,
2453                                    struct xilinx_aximcdma_tx_segment, node);
2454         desc->async_tx.phys = segment->phys;
2455
2456         /* For the last DMA_MEM_TO_DEV transfer, set EOP */
2457         if (chan->direction == DMA_MEM_TO_DEV) {
2458                 segment->hw.control |= XILINX_MCDMA_BD_SOP;
2459                 segment = list_last_entry(&desc->segments,
2460                                           struct xilinx_aximcdma_tx_segment,
2461                                           node);
2462                 segment->hw.control |= XILINX_MCDMA_BD_EOP;
2463         }
2464
2465         return &desc->async_tx;
2466
2467 error:
2468         xilinx_dma_free_tx_descriptor(chan, desc);
2469
2470         return NULL;
2471 }
2472
2473 /**
2474  * xilinx_dma_terminate_all - Halt the channel and free descriptors
2475  * @dchan: Driver specific DMA Channel pointer
2476  *
2477  * Return: '0' always.
2478  */
2479 static int xilinx_dma_terminate_all(struct dma_chan *dchan)
2480 {
2481         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2482         u32 reg;
2483         int err;
2484
2485         if (!chan->cyclic) {
2486                 err = chan->stop_transfer(chan);
2487                 if (err) {
2488                         dev_err(chan->dev, "Cannot stop channel %p: %x\n",
2489                                 chan, dma_ctrl_read(chan,
2490                                 XILINX_DMA_REG_DMASR));
2491                         chan->err = true;
2492                 }
2493         }
2494
2495         xilinx_dma_chan_reset(chan);
2496         /* Remove and free all of the descriptors in the lists */
2497         chan->terminating = true;
2498         xilinx_dma_free_descriptors(chan);
2499         chan->idle = true;
2500
2501         if (chan->cyclic) {
2502                 reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
2503                 reg &= ~XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
2504                 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
2505                 chan->cyclic = false;
2506         }
2507
2508         if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
2509                 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
2510                              XILINX_CDMA_CR_SGMODE);
2511
2512         return 0;
2513 }
2514
2515 static void xilinx_dma_synchronize(struct dma_chan *dchan)
2516 {
2517         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2518
2519         tasklet_kill(&chan->tasklet);
2520 }
2521
2522 /**
2523  * xilinx_vdma_channel_set_config - Configure VDMA channel
2524  * Run-time configuration for Axi VDMA, supports:
2525  * . halt the channel
2526  * . configure interrupt coalescing and inter-packet delay threshold
2527  * . start/stop parking
2528  * . enable genlock
2529  *
2530  * @dchan: DMA channel
2531  * @cfg: VDMA device configuration pointer
2532  *
2533  * Return: '0' on success and failure value on error
2534  */
2535 int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
2536                                         struct xilinx_vdma_config *cfg)
2537 {
2538         struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
2539         u32 dmacr;
2540
2541         if (cfg->reset)
2542                 return xilinx_dma_chan_reset(chan);
2543
2544         dmacr = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
2545
2546         chan->config.frm_dly = cfg->frm_dly;
2547         chan->config.park = cfg->park;
2548
2549         /* genlock settings */
2550         chan->config.gen_lock = cfg->gen_lock;
2551         chan->config.master = cfg->master;
2552
2553         dmacr &= ~XILINX_DMA_DMACR_GENLOCK_EN;
2554         if (cfg->gen_lock && chan->genlock) {
2555                 dmacr |= XILINX_DMA_DMACR_GENLOCK_EN;
2556                 dmacr &= ~XILINX_DMA_DMACR_MASTER_MASK;
2557                 dmacr |= cfg->master << XILINX_DMA_DMACR_MASTER_SHIFT;
2558         }
2559
2560         chan->config.frm_cnt_en = cfg->frm_cnt_en;
2561         chan->config.vflip_en = cfg->vflip_en;
2562
2563         if (cfg->park)
2564                 chan->config.park_frm = cfg->park_frm;
2565         else
2566                 chan->config.park_frm = -1;
2567
2568         chan->config.coalesc = cfg->coalesc;
2569         chan->config.delay = cfg->delay;
2570
2571         if (cfg->coalesc <= XILINX_DMA_DMACR_FRAME_COUNT_MAX) {
2572                 dmacr &= ~XILINX_DMA_DMACR_FRAME_COUNT_MASK;
2573                 dmacr |= cfg->coalesc << XILINX_DMA_DMACR_FRAME_COUNT_SHIFT;
2574                 chan->config.coalesc = cfg->coalesc;
2575         }
2576
2577         if (cfg->delay <= XILINX_DMA_DMACR_DELAY_MAX) {
2578                 dmacr &= ~XILINX_DMA_DMACR_DELAY_MASK;
2579                 dmacr |= cfg->delay << XILINX_DMA_DMACR_DELAY_SHIFT;
2580                 chan->config.delay = cfg->delay;
2581         }
2582
2583         /* FSync Source selection */
2584         dmacr &= ~XILINX_DMA_DMACR_FSYNCSRC_MASK;
2585         dmacr |= cfg->ext_fsync << XILINX_DMA_DMACR_FSYNCSRC_SHIFT;
2586
2587         dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, dmacr);
2588
2589         return 0;
2590 }
2591 EXPORT_SYMBOL(xilinx_vdma_channel_set_config);
2592
2593 /* -----------------------------------------------------------------------------
2594  * Probe and remove
2595  */
2596
2597 /**
2598  * xilinx_dma_chan_remove - Per Channel remove function
2599  * @chan: Driver specific DMA channel
2600  */
2601 static void xilinx_dma_chan_remove(struct xilinx_dma_chan *chan)
2602 {
2603         /* Disable all interrupts */
2604         dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
2605                       XILINX_DMA_DMAXR_ALL_IRQ_MASK);
2606
2607         if (chan->irq > 0)
2608                 free_irq(chan->irq, chan);
2609
2610         tasklet_kill(&chan->tasklet);
2611
2612         list_del(&chan->common.device_node);
2613 }
2614
2615 static int axidma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
2616                             struct clk **tx_clk, struct clk **rx_clk,
2617                             struct clk **sg_clk, struct clk **tmp_clk)
2618 {
2619         int err;
2620
2621         *tmp_clk = NULL;
2622
2623         *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
2624         if (IS_ERR(*axi_clk))
2625                 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
2626
2627         *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
2628         if (IS_ERR(*tx_clk))
2629                 *tx_clk = NULL;
2630
2631         *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
2632         if (IS_ERR(*rx_clk))
2633                 *rx_clk = NULL;
2634
2635         *sg_clk = devm_clk_get(&pdev->dev, "m_axi_sg_aclk");
2636         if (IS_ERR(*sg_clk))
2637                 *sg_clk = NULL;
2638
2639         err = clk_prepare_enable(*axi_clk);
2640         if (err) {
2641                 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
2642                 return err;
2643         }
2644
2645         err = clk_prepare_enable(*tx_clk);
2646         if (err) {
2647                 dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
2648                 goto err_disable_axiclk;
2649         }
2650
2651         err = clk_prepare_enable(*rx_clk);
2652         if (err) {
2653                 dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
2654                 goto err_disable_txclk;
2655         }
2656
2657         err = clk_prepare_enable(*sg_clk);
2658         if (err) {
2659                 dev_err(&pdev->dev, "failed to enable sg_clk (%d)\n", err);
2660                 goto err_disable_rxclk;
2661         }
2662
2663         return 0;
2664
2665 err_disable_rxclk:
2666         clk_disable_unprepare(*rx_clk);
2667 err_disable_txclk:
2668         clk_disable_unprepare(*tx_clk);
2669 err_disable_axiclk:
2670         clk_disable_unprepare(*axi_clk);
2671
2672         return err;
2673 }
2674
2675 static int axicdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
2676                             struct clk **dev_clk, struct clk **tmp_clk,
2677                             struct clk **tmp1_clk, struct clk **tmp2_clk)
2678 {
2679         int err;
2680
2681         *tmp_clk = NULL;
2682         *tmp1_clk = NULL;
2683         *tmp2_clk = NULL;
2684
2685         *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
2686         if (IS_ERR(*axi_clk))
2687                 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
2688
2689         *dev_clk = devm_clk_get(&pdev->dev, "m_axi_aclk");
2690         if (IS_ERR(*dev_clk))
2691                 return dev_err_probe(&pdev->dev, PTR_ERR(*dev_clk), "failed to get dev_clk\n");
2692
2693         err = clk_prepare_enable(*axi_clk);
2694         if (err) {
2695                 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
2696                 return err;
2697         }
2698
2699         err = clk_prepare_enable(*dev_clk);
2700         if (err) {
2701                 dev_err(&pdev->dev, "failed to enable dev_clk (%d)\n", err);
2702                 goto err_disable_axiclk;
2703         }
2704
2705         return 0;
2706
2707 err_disable_axiclk:
2708         clk_disable_unprepare(*axi_clk);
2709
2710         return err;
2711 }
2712
2713 static int axivdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
2714                             struct clk **tx_clk, struct clk **txs_clk,
2715                             struct clk **rx_clk, struct clk **rxs_clk)
2716 {
2717         int err;
2718
2719         *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
2720         if (IS_ERR(*axi_clk))
2721                 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
2722
2723         *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
2724         if (IS_ERR(*tx_clk))
2725                 *tx_clk = NULL;
2726
2727         *txs_clk = devm_clk_get(&pdev->dev, "m_axis_mm2s_aclk");
2728         if (IS_ERR(*txs_clk))
2729                 *txs_clk = NULL;
2730
2731         *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
2732         if (IS_ERR(*rx_clk))
2733                 *rx_clk = NULL;
2734
2735         *rxs_clk = devm_clk_get(&pdev->dev, "s_axis_s2mm_aclk");
2736         if (IS_ERR(*rxs_clk))
2737                 *rxs_clk = NULL;
2738
2739         err = clk_prepare_enable(*axi_clk);
2740         if (err) {
2741                 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n",
2742                         err);
2743                 return err;
2744         }
2745
2746         err = clk_prepare_enable(*tx_clk);
2747         if (err) {
2748                 dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
2749                 goto err_disable_axiclk;
2750         }
2751
2752         err = clk_prepare_enable(*txs_clk);
2753         if (err) {
2754                 dev_err(&pdev->dev, "failed to enable txs_clk (%d)\n", err);
2755                 goto err_disable_txclk;
2756         }
2757
2758         err = clk_prepare_enable(*rx_clk);
2759         if (err) {
2760                 dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
2761                 goto err_disable_txsclk;
2762         }
2763
2764         err = clk_prepare_enable(*rxs_clk);
2765         if (err) {
2766                 dev_err(&pdev->dev, "failed to enable rxs_clk (%d)\n", err);
2767                 goto err_disable_rxclk;
2768         }
2769
2770         return 0;
2771
2772 err_disable_rxclk:
2773         clk_disable_unprepare(*rx_clk);
2774 err_disable_txsclk:
2775         clk_disable_unprepare(*txs_clk);
2776 err_disable_txclk:
2777         clk_disable_unprepare(*tx_clk);
2778 err_disable_axiclk:
2779         clk_disable_unprepare(*axi_clk);
2780
2781         return err;
2782 }
2783
2784 static void xdma_disable_allclks(struct xilinx_dma_device *xdev)
2785 {
2786         clk_disable_unprepare(xdev->rxs_clk);
2787         clk_disable_unprepare(xdev->rx_clk);
2788         clk_disable_unprepare(xdev->txs_clk);
2789         clk_disable_unprepare(xdev->tx_clk);
2790         clk_disable_unprepare(xdev->axi_clk);
2791 }
2792
2793 /**
2794  * xilinx_dma_chan_probe - Per Channel Probing
2795  * It get channel features from the device tree entry and
2796  * initialize special channel handling routines
2797  *
2798  * @xdev: Driver specific device structure
2799  * @node: Device node
2800  *
2801  * Return: '0' on success and failure value on error
2802  */
2803 static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
2804                                   struct device_node *node)
2805 {
2806         struct xilinx_dma_chan *chan;
2807         bool has_dre = false;
2808         u32 value, width;
2809         int err;
2810
2811         /* Allocate and initialize the channel structure */
2812         chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
2813         if (!chan)
2814                 return -ENOMEM;
2815
2816         chan->dev = xdev->dev;
2817         chan->xdev = xdev;
2818         chan->desc_pendingcount = 0x0;
2819         chan->ext_addr = xdev->ext_addr;
2820         /* This variable ensures that descriptors are not
2821          * Submitted when dma engine is in progress. This variable is
2822          * Added to avoid polling for a bit in the status register to
2823          * Know dma state in the driver hot path.
2824          */
2825         chan->idle = true;
2826
2827         spin_lock_init(&chan->lock);
2828         INIT_LIST_HEAD(&chan->pending_list);
2829         INIT_LIST_HEAD(&chan->done_list);
2830         INIT_LIST_HEAD(&chan->active_list);
2831         INIT_LIST_HEAD(&chan->free_seg_list);
2832
2833         /* Retrieve the channel properties from the device tree */
2834         has_dre = of_property_read_bool(node, "xlnx,include-dre");
2835
2836         of_property_read_u8(node, "xlnx,irq-delay", &chan->irq_delay);
2837
2838         chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode");
2839
2840         err = of_property_read_u32(node, "xlnx,datawidth", &value);
2841         if (err) {
2842                 dev_err(xdev->dev, "missing xlnx,datawidth property\n");
2843                 return err;
2844         }
2845         width = value >> 3; /* Convert bits to bytes */
2846
2847         /* If data width is greater than 8 bytes, DRE is not in hw */
2848         if (width > 8)
2849                 has_dre = false;
2850
2851         if (!has_dre)
2852                 xdev->common.copy_align = (enum dmaengine_alignment)fls(width - 1);
2853
2854         if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel") ||
2855             of_device_is_compatible(node, "xlnx,axi-dma-mm2s-channel") ||
2856             of_device_is_compatible(node, "xlnx,axi-cdma-channel")) {
2857                 chan->direction = DMA_MEM_TO_DEV;
2858                 chan->id = xdev->mm2s_chan_id++;
2859                 chan->tdest = chan->id;
2860
2861                 chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
2862                 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
2863                         chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
2864                         chan->config.park = 1;
2865
2866                         if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
2867                             xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
2868                                 chan->flush_on_fsync = true;
2869                 }
2870         } else if (of_device_is_compatible(node,
2871                                            "xlnx,axi-vdma-s2mm-channel") ||
2872                    of_device_is_compatible(node,
2873                                            "xlnx,axi-dma-s2mm-channel")) {
2874                 chan->direction = DMA_DEV_TO_MEM;
2875                 chan->id = xdev->s2mm_chan_id++;
2876                 chan->tdest = chan->id - xdev->dma_config->max_channels / 2;
2877                 chan->has_vflip = of_property_read_bool(node,
2878                                         "xlnx,enable-vert-flip");
2879                 if (chan->has_vflip) {
2880                         chan->config.vflip_en = dma_read(chan,
2881                                 XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP) &
2882                                 XILINX_VDMA_ENABLE_VERTICAL_FLIP;
2883                 }
2884
2885                 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA)
2886                         chan->ctrl_offset = XILINX_MCDMA_S2MM_CTRL_OFFSET;
2887                 else
2888                         chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
2889
2890                 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
2891                         chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
2892                         chan->config.park = 1;
2893
2894                         if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
2895                             xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
2896                                 chan->flush_on_fsync = true;
2897                 }
2898         } else {
2899                 dev_err(xdev->dev, "Invalid channel compatible node\n");
2900                 return -EINVAL;
2901         }
2902
2903         /* Request the interrupt */
2904         chan->irq = of_irq_get(node, chan->tdest);
2905         if (chan->irq < 0)
2906                 return dev_err_probe(xdev->dev, chan->irq, "failed to get irq\n");
2907         err = request_irq(chan->irq, xdev->dma_config->irq_handler,
2908                           IRQF_SHARED, "xilinx-dma-controller", chan);
2909         if (err) {
2910                 dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq);
2911                 return err;
2912         }
2913
2914         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
2915                 chan->start_transfer = xilinx_dma_start_transfer;
2916                 chan->stop_transfer = xilinx_dma_stop_transfer;
2917         } else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
2918                 chan->start_transfer = xilinx_mcdma_start_transfer;
2919                 chan->stop_transfer = xilinx_dma_stop_transfer;
2920         } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
2921                 chan->start_transfer = xilinx_cdma_start_transfer;
2922                 chan->stop_transfer = xilinx_cdma_stop_transfer;
2923         } else {
2924                 chan->start_transfer = xilinx_vdma_start_transfer;
2925                 chan->stop_transfer = xilinx_dma_stop_transfer;
2926         }
2927
2928         /* check if SG is enabled (only for AXIDMA, AXIMCDMA, and CDMA) */
2929         if (xdev->dma_config->dmatype != XDMA_TYPE_VDMA) {
2930                 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA ||
2931                     dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
2932                             XILINX_DMA_DMASR_SG_MASK)
2933                         chan->has_sg = true;
2934                 dev_dbg(chan->dev, "ch %d: SG %s\n", chan->id,
2935                         chan->has_sg ? "enabled" : "disabled");
2936         }
2937
2938         /* Initialize the tasklet */
2939         tasklet_setup(&chan->tasklet, xilinx_dma_do_tasklet);
2940
2941         /*
2942          * Initialize the DMA channel and add it to the DMA engine channels
2943          * list.
2944          */
2945         chan->common.device = &xdev->common;
2946
2947         list_add_tail(&chan->common.device_node, &xdev->common.channels);
2948         xdev->chan[chan->id] = chan;
2949
2950         /* Reset the channel */
2951         err = xilinx_dma_chan_reset(chan);
2952         if (err < 0) {
2953                 dev_err(xdev->dev, "Reset channel failed\n");
2954                 return err;
2955         }
2956
2957         return 0;
2958 }
2959
2960 /**
2961  * xilinx_dma_child_probe - Per child node probe
2962  * It get number of dma-channels per child node from
2963  * device-tree and initializes all the channels.
2964  *
2965  * @xdev: Driver specific device structure
2966  * @node: Device node
2967  *
2968  * Return: '0' on success and failure value on error.
2969  */
2970 static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev,
2971                                     struct device_node *node)
2972 {
2973         int ret, i;
2974         u32 nr_channels = 1;
2975
2976         ret = of_property_read_u32(node, "dma-channels", &nr_channels);
2977         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA && ret < 0)
2978                 dev_warn(xdev->dev, "missing dma-channels property\n");
2979
2980         for (i = 0; i < nr_channels; i++) {
2981                 ret = xilinx_dma_chan_probe(xdev, node);
2982                 if (ret)
2983                         return ret;
2984         }
2985
2986         return 0;
2987 }
2988
2989 /**
2990  * of_dma_xilinx_xlate - Translation function
2991  * @dma_spec: Pointer to DMA specifier as found in the device tree
2992  * @ofdma: Pointer to DMA controller data
2993  *
2994  * Return: DMA channel pointer on success and NULL on error
2995  */
2996 static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
2997                                                 struct of_dma *ofdma)
2998 {
2999         struct xilinx_dma_device *xdev = ofdma->of_dma_data;
3000         int chan_id = dma_spec->args[0];
3001
3002         if (chan_id >= xdev->dma_config->max_channels || !xdev->chan[chan_id])
3003                 return NULL;
3004
3005         return dma_get_slave_channel(&xdev->chan[chan_id]->common);
3006 }
3007
3008 static const struct xilinx_dma_config axidma_config = {
3009         .dmatype = XDMA_TYPE_AXIDMA,
3010         .clk_init = axidma_clk_init,
3011         .irq_handler = xilinx_dma_irq_handler,
3012         .max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE,
3013 };
3014
3015 static const struct xilinx_dma_config aximcdma_config = {
3016         .dmatype = XDMA_TYPE_AXIMCDMA,
3017         .clk_init = axidma_clk_init,
3018         .irq_handler = xilinx_mcdma_irq_handler,
3019         .max_channels = XILINX_MCDMA_MAX_CHANS_PER_DEVICE,
3020 };
3021 static const struct xilinx_dma_config axicdma_config = {
3022         .dmatype = XDMA_TYPE_CDMA,
3023         .clk_init = axicdma_clk_init,
3024         .irq_handler = xilinx_dma_irq_handler,
3025         .max_channels = XILINX_CDMA_MAX_CHANS_PER_DEVICE,
3026 };
3027
3028 static const struct xilinx_dma_config axivdma_config = {
3029         .dmatype = XDMA_TYPE_VDMA,
3030         .clk_init = axivdma_clk_init,
3031         .irq_handler = xilinx_dma_irq_handler,
3032         .max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE,
3033 };
3034
3035 static const struct of_device_id xilinx_dma_of_ids[] = {
3036         { .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config },
3037         { .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config },
3038         { .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config },
3039         { .compatible = "xlnx,axi-mcdma-1.00.a", .data = &aximcdma_config },
3040         {}
3041 };
3042 MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
3043
3044 /**
3045  * xilinx_dma_probe - Driver probe function
3046  * @pdev: Pointer to the platform_device structure
3047  *
3048  * Return: '0' on success and failure value on error
3049  */
3050 static int xilinx_dma_probe(struct platform_device *pdev)
3051 {
3052         int (*clk_init)(struct platform_device *, struct clk **, struct clk **,
3053                         struct clk **, struct clk **, struct clk **)
3054                                         = axivdma_clk_init;
3055         struct device_node *node = pdev->dev.of_node;
3056         struct xilinx_dma_device *xdev;
3057         struct device_node *child, *np = pdev->dev.of_node;
3058         u32 num_frames, addr_width, len_width;
3059         int i, err;
3060
3061         /* Allocate and initialize the DMA engine structure */
3062         xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
3063         if (!xdev)
3064                 return -ENOMEM;
3065
3066         xdev->dev = &pdev->dev;
3067         if (np) {
3068                 const struct of_device_id *match;
3069
3070                 match = of_match_node(xilinx_dma_of_ids, np);
3071                 if (match && match->data) {
3072                         xdev->dma_config = match->data;
3073                         clk_init = xdev->dma_config->clk_init;
3074                 }
3075         }
3076
3077         err = clk_init(pdev, &xdev->axi_clk, &xdev->tx_clk, &xdev->txs_clk,
3078                        &xdev->rx_clk, &xdev->rxs_clk);
3079         if (err)
3080                 return err;
3081
3082         /* Request and map I/O memory */
3083         xdev->regs = devm_platform_ioremap_resource(pdev, 0);
3084         if (IS_ERR(xdev->regs)) {
3085                 err = PTR_ERR(xdev->regs);
3086                 goto disable_clks;
3087         }
3088         /* Retrieve the DMA engine properties from the device tree */
3089         xdev->max_buffer_len = GENMASK(XILINX_DMA_MAX_TRANS_LEN_MAX - 1, 0);
3090         xdev->s2mm_chan_id = xdev->dma_config->max_channels / 2;
3091
3092         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA ||
3093             xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
3094                 if (!of_property_read_u32(node, "xlnx,sg-length-width",
3095                                           &len_width)) {
3096                         if (len_width < XILINX_DMA_MAX_TRANS_LEN_MIN ||
3097                             len_width > XILINX_DMA_V2_MAX_TRANS_LEN_MAX) {
3098                                 dev_warn(xdev->dev,
3099                                          "invalid xlnx,sg-length-width property value. Using default width\n");
3100                         } else {
3101                                 if (len_width > XILINX_DMA_MAX_TRANS_LEN_MAX)
3102                                         dev_warn(xdev->dev, "Please ensure that IP supports buffer length > 23 bits\n");
3103                                 xdev->max_buffer_len =
3104                                         GENMASK(len_width - 1, 0);
3105                         }
3106                 }
3107         }
3108
3109         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
3110                 xdev->has_axistream_connected =
3111                         of_property_read_bool(node, "xlnx,axistream-connected");
3112         }
3113
3114         if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
3115                 err = of_property_read_u32(node, "xlnx,num-fstores",
3116                                            &num_frames);
3117                 if (err < 0) {
3118                         dev_err(xdev->dev,
3119                                 "missing xlnx,num-fstores property\n");
3120                         goto disable_clks;
3121                 }
3122
3123                 err = of_property_read_u32(node, "xlnx,flush-fsync",
3124                                            &xdev->flush_on_fsync);
3125                 if (err < 0)
3126                         dev_warn(xdev->dev,
3127                                  "missing xlnx,flush-fsync property\n");
3128         }
3129
3130         err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
3131         if (err < 0)
3132                 dev_warn(xdev->dev, "missing xlnx,addrwidth property\n");
3133
3134         if (addr_width > 32)
3135                 xdev->ext_addr = true;
3136         else
3137                 xdev->ext_addr = false;
3138
3139         /* Set metadata mode */
3140         if (xdev->has_axistream_connected)
3141                 xdev->common.desc_metadata_modes = DESC_METADATA_ENGINE;
3142
3143         /* Set the dma mask bits */
3144         err = dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
3145         if (err < 0) {
3146                 dev_err(xdev->dev, "DMA mask error %d\n", err);
3147                 goto disable_clks;
3148         }
3149
3150         /* Initialize the DMA engine */
3151         xdev->common.dev = &pdev->dev;
3152
3153         INIT_LIST_HEAD(&xdev->common.channels);
3154         if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) {
3155                 dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
3156                 dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
3157         }
3158
3159         xdev->common.device_alloc_chan_resources =
3160                                 xilinx_dma_alloc_chan_resources;
3161         xdev->common.device_free_chan_resources =
3162                                 xilinx_dma_free_chan_resources;
3163         xdev->common.device_terminate_all = xilinx_dma_terminate_all;
3164         xdev->common.device_synchronize = xilinx_dma_synchronize;
3165         xdev->common.device_tx_status = xilinx_dma_tx_status;
3166         xdev->common.device_issue_pending = xilinx_dma_issue_pending;
3167         xdev->common.device_config = xilinx_dma_device_config;
3168         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
3169                 dma_cap_set(DMA_CYCLIC, xdev->common.cap_mask);
3170                 xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg;
3171                 xdev->common.device_prep_dma_cyclic =
3172                                           xilinx_dma_prep_dma_cyclic;
3173                 /* Residue calculation is supported by only AXI DMA and CDMA */
3174                 xdev->common.residue_granularity =
3175                                           DMA_RESIDUE_GRANULARITY_SEGMENT;
3176         } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
3177                 dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask);
3178                 xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy;
3179                 /* Residue calculation is supported by only AXI DMA and CDMA */
3180                 xdev->common.residue_granularity =
3181                                           DMA_RESIDUE_GRANULARITY_SEGMENT;
3182         } else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
3183                 xdev->common.device_prep_slave_sg = xilinx_mcdma_prep_slave_sg;
3184         } else {
3185                 xdev->common.device_prep_interleaved_dma =
3186                                 xilinx_vdma_dma_prep_interleaved;
3187         }
3188
3189         platform_set_drvdata(pdev, xdev);
3190
3191         /* Initialize the channels */
3192         for_each_child_of_node(node, child) {
3193                 err = xilinx_dma_child_probe(xdev, child);
3194                 if (err < 0) {
3195                         of_node_put(child);
3196                         goto error;
3197                 }
3198         }
3199
3200         if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
3201                 for (i = 0; i < xdev->dma_config->max_channels; i++)
3202                         if (xdev->chan[i])
3203                                 xdev->chan[i]->num_frms = num_frames;
3204         }
3205
3206         /* Register the DMA engine with the core */
3207         err = dma_async_device_register(&xdev->common);
3208         if (err) {
3209                 dev_err(xdev->dev, "failed to register the dma device\n");
3210                 goto error;
3211         }
3212
3213         err = of_dma_controller_register(node, of_dma_xilinx_xlate,
3214                                          xdev);
3215         if (err < 0) {
3216                 dev_err(&pdev->dev, "Unable to register DMA to DT\n");
3217                 dma_async_device_unregister(&xdev->common);
3218                 goto error;
3219         }
3220
3221         if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
3222                 dev_info(&pdev->dev, "Xilinx AXI DMA Engine Driver Probed!!\n");
3223         else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA)
3224                 dev_info(&pdev->dev, "Xilinx AXI CDMA Engine Driver Probed!!\n");
3225         else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA)
3226                 dev_info(&pdev->dev, "Xilinx AXI MCDMA Engine Driver Probed!!\n");
3227         else
3228                 dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n");
3229
3230         return 0;
3231
3232 error:
3233         for (i = 0; i < xdev->dma_config->max_channels; i++)
3234                 if (xdev->chan[i])
3235                         xilinx_dma_chan_remove(xdev->chan[i]);
3236 disable_clks:
3237         xdma_disable_allclks(xdev);
3238
3239         return err;
3240 }
3241
3242 /**
3243  * xilinx_dma_remove - Driver remove function
3244  * @pdev: Pointer to the platform_device structure
3245  */
3246 static void xilinx_dma_remove(struct platform_device *pdev)
3247 {
3248         struct xilinx_dma_device *xdev = platform_get_drvdata(pdev);
3249         int i;
3250
3251         of_dma_controller_free(pdev->dev.of_node);
3252
3253         dma_async_device_unregister(&xdev->common);
3254
3255         for (i = 0; i < xdev->dma_config->max_channels; i++)
3256                 if (xdev->chan[i])
3257                         xilinx_dma_chan_remove(xdev->chan[i]);
3258
3259         xdma_disable_allclks(xdev);
3260 }
3261
3262 static struct platform_driver xilinx_vdma_driver = {
3263         .driver = {
3264                 .name = "xilinx-vdma",
3265                 .of_match_table = xilinx_dma_of_ids,
3266         },
3267         .probe = xilinx_dma_probe,
3268         .remove_new = xilinx_dma_remove,
3269 };
3270
3271 module_platform_driver(xilinx_vdma_driver);
3272
3273 MODULE_AUTHOR("Xilinx, Inc.");
3274 MODULE_DESCRIPTION("Xilinx VDMA driver");
3275 MODULE_LICENSE("GPL v2");