drivers/spi/spi-zynqmp-gqspi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver
   4  * (master mode only)
   5  *
   6  * Copyright (C) 2009 - 2015 Xilinx, Inc.
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/dmaengine.h>
  13 #include <linux/firmware/xlnx-zynqmp.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/of_address.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/spi/spi-mem.h>
  25
  26 /* Generic QSPI register offsets */
  27 #define GQSPI_CONFIG_OFST               0x00000100
  28 #define GQSPI_ISR_OFST                  0x00000104
  29 #define GQSPI_IDR_OFST                  0x0000010C
  30 #define GQSPI_IER_OFST                  0x00000108
  31 #define GQSPI_IMASK_OFST                0x00000110
  32 #define GQSPI_EN_OFST                   0x00000114
  33 #define GQSPI_TXD_OFST                  0x0000011C
  34 #define GQSPI_RXD_OFST                  0x00000120
  35 #define GQSPI_TX_THRESHOLD_OFST         0x00000128
  36 #define GQSPI_RX_THRESHOLD_OFST         0x0000012C
  37 #define GQSPI_LPBK_DLY_ADJ_OFST         0x00000138
  38 #define GQSPI_GEN_FIFO_OFST             0x00000140
  39 #define GQSPI_SEL_OFST                  0x00000144
  40 #define GQSPI_GF_THRESHOLD_OFST         0x00000150
  41 #define GQSPI_FIFO_CTRL_OFST            0x0000014C
  42 #define GQSPI_QSPIDMA_DST_CTRL_OFST     0x0000080C
  43 #define GQSPI_QSPIDMA_DST_SIZE_OFST     0x00000804
  44 #define GQSPI_QSPIDMA_DST_STS_OFST      0x00000808
  45 #define GQSPI_QSPIDMA_DST_I_STS_OFST    0x00000814
  46 #define GQSPI_QSPIDMA_DST_I_EN_OFST     0x00000818
  47 #define GQSPI_QSPIDMA_DST_I_DIS_OFST    0x0000081C
  48 #define GQSPI_QSPIDMA_DST_I_MASK_OFST   0x00000820
  49 #define GQSPI_QSPIDMA_DST_ADDR_OFST     0x00000800
  50 #define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828
  51
  52 /* GQSPI register bit masks */
  53 #define GQSPI_SEL_MASK                          0x00000001
  54 #define GQSPI_EN_MASK                           0x00000001
  55 #define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK        0x00000020
  56 #define GQSPI_ISR_WR_TO_CLR_MASK                0x00000002
  57 #define GQSPI_IDR_ALL_MASK                      0x00000FBE
  58 #define GQSPI_CFG_MODE_EN_MASK                  0xC0000000
  59 #define GQSPI_CFG_GEN_FIFO_START_MODE_MASK      0x20000000
  60 #define GQSPI_CFG_ENDIAN_MASK                   0x04000000
  61 #define GQSPI_CFG_EN_POLL_TO_MASK               0x00100000
  62 #define GQSPI_CFG_WP_HOLD_MASK                  0x00080000
  63 #define GQSPI_CFG_BAUD_RATE_DIV_MASK            0x00000038
  64 #define GQSPI_CFG_CLK_PHA_MASK                  0x00000004
  65 #define GQSPI_CFG_CLK_POL_MASK                  0x00000002
  66 #define GQSPI_CFG_START_GEN_FIFO_MASK           0x10000000
  67 #define GQSPI_GENFIFO_IMM_DATA_MASK             0x000000FF
  68 #define GQSPI_GENFIFO_DATA_XFER                 0x00000100
  69 #define GQSPI_GENFIFO_EXP                       0x00000200
  70 #define GQSPI_GENFIFO_MODE_SPI                  0x00000400
  71 #define GQSPI_GENFIFO_MODE_DUALSPI              0x00000800
  72 #define GQSPI_GENFIFO_MODE_QUADSPI              0x00000C00
  73 #define GQSPI_GENFIFO_MODE_MASK                 0x00000C00
  74 #define GQSPI_GENFIFO_CS_LOWER                  0x00001000
  75 #define GQSPI_GENFIFO_CS_UPPER                  0x00002000
  76 #define GQSPI_GENFIFO_BUS_LOWER                 0x00004000
  77 #define GQSPI_GENFIFO_BUS_UPPER                 0x00008000
  78 #define GQSPI_GENFIFO_BUS_BOTH                  0x0000C000
  79 #define GQSPI_GENFIFO_BUS_MASK                  0x0000C000
  80 #define GQSPI_GENFIFO_TX                        0x00010000
  81 #define GQSPI_GENFIFO_RX                        0x00020000
  82 #define GQSPI_GENFIFO_STRIPE                    0x00040000
  83 #define GQSPI_GENFIFO_POLL                      0x00080000
  84 #define GQSPI_GENFIFO_EXP_START                 0x00000100
  85 #define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK        0x00000004
  86 #define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK        0x00000002
  87 #define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK       0x00000001
  88 #define GQSPI_ISR_RXEMPTY_MASK                  0x00000800
  89 #define GQSPI_ISR_GENFIFOFULL_MASK              0x00000400
  90 #define GQSPI_ISR_GENFIFONOT_FULL_MASK          0x00000200
  91 #define GQSPI_ISR_TXEMPTY_MASK                  0x00000100
  92 #define GQSPI_ISR_GENFIFOEMPTY_MASK             0x00000080
  93 #define GQSPI_ISR_RXFULL_MASK                   0x00000020
  94 #define GQSPI_ISR_RXNEMPTY_MASK                 0x00000010
  95 #define GQSPI_ISR_TXFULL_MASK                   0x00000008
  96 #define GQSPI_ISR_TXNOT_FULL_MASK               0x00000004
  97 #define GQSPI_ISR_POLL_TIME_EXPIRE_MASK         0x00000002
  98 #define GQSPI_IER_TXNOT_FULL_MASK               0x00000004
  99 #define GQSPI_IER_RXEMPTY_MASK                  0x00000800
 100 #define GQSPI_IER_POLL_TIME_EXPIRE_MASK         0x00000002
 101 #define GQSPI_IER_RXNEMPTY_MASK                 0x00000010
 102 #define GQSPI_IER_GENFIFOEMPTY_MASK             0x00000080
 103 #define GQSPI_IER_TXEMPTY_MASK                  0x00000100
 104 #define GQSPI_QSPIDMA_DST_INTR_ALL_MASK         0x000000FE
 105 #define GQSPI_QSPIDMA_DST_STS_WTC               0x0000E000
 106 #define GQSPI_CFG_MODE_EN_DMA_MASK              0x80000000
 107 #define GQSPI_ISR_IDR_MASK                      0x00000994
 108 #define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK        0x00000002
 109 #define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK       0x00000002
 110 #define GQSPI_IRQ_MASK                          0x00000980
 111
 112 #define GQSPI_CFG_BAUD_RATE_DIV_SHIFT           3
 113 #define GQSPI_GENFIFO_CS_SETUP                  0x4
 114 #define GQSPI_GENFIFO_CS_HOLD                   0x3
 115 #define GQSPI_TXD_DEPTH                         64
 116 #define GQSPI_RX_FIFO_THRESHOLD                 32
 117 #define GQSPI_RX_FIFO_FILL      (GQSPI_RX_FIFO_THRESHOLD * 4)
 118 #define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL       32
 119 #define GQSPI_TX_FIFO_FILL      (GQSPI_TXD_DEPTH -\
 120                                 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL)
 121 #define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL      0X10
 122 #define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL        0x803FFA00
 123 #define GQSPI_SELECT_FLASH_CS_LOWER             0x1
 124 #define GQSPI_SELECT_FLASH_CS_UPPER             0x2
 125 #define GQSPI_SELECT_FLASH_CS_BOTH              0x3
 126 #define GQSPI_SELECT_FLASH_BUS_LOWER            0x1
 127 #define GQSPI_SELECT_FLASH_BUS_UPPER            0x2
 128 #define GQSPI_SELECT_FLASH_BUS_BOTH             0x3
 129 #define GQSPI_BAUD_DIV_MAX      7       /* Baud rate divisor maximum */
 130 #define GQSPI_BAUD_DIV_SHIFT    2       /* Baud rate divisor shift */
 131 #define GQSPI_SELECT_MODE_SPI           0x1
 132 #define GQSPI_SELECT_MODE_DUALSPI       0x2
 133 #define GQSPI_SELECT_MODE_QUADSPI       0x4
 134 #define GQSPI_DMA_UNALIGN               0x3
 135 #define GQSPI_DEFAULT_NUM_CS    1       /* Default number of chip selects */
 136
 137 #define SPI_AUTOSUSPEND_TIMEOUT         3000
 138 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
 139
 140 /**
 141  * struct zynqmp_qspi - Defines qspi driver instance
 142  * @regs:               Virtual address of the QSPI controller registers
 143  * @refclk:             Pointer to the peripheral clock
 144  * @pclk:               Pointer to the APB clock
 145  * @irq:                IRQ number
 146  * @dev:                Pointer to struct device
 147  * @txbuf:              Pointer to the TX buffer
 148  * @rxbuf:              Pointer to the RX buffer
 149  * @bytes_to_transfer:  Number of bytes left to transfer
 150  * @bytes_to_receive:   Number of bytes left to receive
 151  * @genfifocs:          Used for chip select
 152  * @genfifobus:         Used to select the upper or lower bus
 153  * @dma_rx_bytes:       Remaining bytes to receive by DMA mode
 154  * @dma_addr:           DMA address after mapping the kernel buffer
 155  * @genfifoentry:       Used for storing the genfifoentry instruction.
 156  * @mode:               Defines the mode in which QSPI is operating
 157  * @data_completion:    completion structure
 158  */
 159 struct zynqmp_qspi {
 160         struct spi_controller *ctlr;
 161         void __iomem *regs;
 162         struct clk *refclk;
 163         struct clk *pclk;
 164         int irq;
 165         struct device *dev;
 166         const void *txbuf;
 167         void *rxbuf;
 168         int bytes_to_transfer;
 169         int bytes_to_receive;
 170         u32 genfifocs;
 171         u32 genfifobus;
 172         u32 dma_rx_bytes;
 173         dma_addr_t dma_addr;
 174         u32 genfifoentry;
 175         enum mode_type mode;
 176         struct completion data_completion;
 177         struct mutex op_lock;
 178 };
 179
 180 /**
 181  * zynqmp_gqspi_read - For GQSPI controller read operation
 182  * @xqspi:      Pointer to the zynqmp_qspi structure
 183  * @offset:     Offset from where to read
 184  * Return:      Value at the offset
 185  */
 186 static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset)
 187 {
 188         return readl_relaxed(xqspi->regs + offset);
 189 }
 190
 191 /**
 192  * zynqmp_gqspi_write - For GQSPI controller write operation
 193  * @xqspi:      Pointer to the zynqmp_qspi structure
 194  * @offset:     Offset where to write
 195  * @val:        Value to be written
 196  */
 197 static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset,
 198                                       u32 val)
 199 {
 200         writel_relaxed(val, (xqspi->regs + offset));
 201 }
 202
 203 /**
 204  * zynqmp_gqspi_selectslave - For selection of slave device
 205  * @instanceptr:        Pointer to the zynqmp_qspi structure
 206  * @slavecs:    For chip select
 207  * @slavebus:   To check which bus is selected- upper or lower
 208  */
 209 static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
 210                                      u8 slavecs, u8 slavebus)
 211 {
 212         /*
 213          * Bus and CS lines selected here will be updated in the instance and
 214          * used for subsequent GENFIFO entries during transfer.
 215          */
 216
 217         /* Choose slave select line */
 218         switch (slavecs) {
 219         case GQSPI_SELECT_FLASH_CS_BOTH:
 220                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER |
 221                         GQSPI_GENFIFO_CS_UPPER;
 222                 break;
 223         case GQSPI_SELECT_FLASH_CS_UPPER:
 224                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER;
 225                 break;
 226         case GQSPI_SELECT_FLASH_CS_LOWER:
 227                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER;
 228                 break;
 229         default:
 230                 dev_warn(instanceptr->dev, "Invalid slave select\n");
 231         }
 232
 233         /* Choose the bus */
 234         switch (slavebus) {
 235         case GQSPI_SELECT_FLASH_BUS_BOTH:
 236                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER |
 237                         GQSPI_GENFIFO_BUS_UPPER;
 238                 break;
 239         case GQSPI_SELECT_FLASH_BUS_UPPER:
 240                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
 241                 break;
 242         case GQSPI_SELECT_FLASH_BUS_LOWER:
 243                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
 244                 break;
 245         default:
 246                 dev_warn(instanceptr->dev, "Invalid slave bus\n");
 247         }
 248 }
 249
 250 /**
 251  * zynqmp_qspi_init_hw - Initialize the hardware
 252  * @xqspi:      Pointer to the zynqmp_qspi structure
 253  *
 254  * The default settings of the QSPI controller's configurable parameters on
 255  * reset are
 256  *      - Master mode
 257  *      - TX threshold set to 1
 258  *      - RX threshold set to 1
 259  *      - Flash memory interface mode enabled
 260  * This function performs the following actions
 261  *      - Disable and clear all the interrupts
 262  *      - Enable manual slave select
 263  *      - Enable manual start
 264  *      - Deselect all the chip select lines
 265  *      - Set the little endian mode of TX FIFO and
 266  *      - Enable the QSPI controller
 267  */
 268 static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 269 {
 270         u32 config_reg;
 271
 272         /* Select the GQSPI mode */
 273         zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK);
 274         /* Clear and disable interrupts */
 275         zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST,
 276                            zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) |
 277                            GQSPI_ISR_WR_TO_CLR_MASK);
 278         /* Clear the DMA STS */
 279         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
 280                            zynqmp_gqspi_read(xqspi,
 281                                              GQSPI_QSPIDMA_DST_I_STS_OFST));
 282         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST,
 283                            zynqmp_gqspi_read(xqspi,
 284                                              GQSPI_QSPIDMA_DST_STS_OFST) |
 285                                              GQSPI_QSPIDMA_DST_STS_WTC);
 286         zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK);
 287         zynqmp_gqspi_write(xqspi,
 288                            GQSPI_QSPIDMA_DST_I_DIS_OFST,
 289                            GQSPI_QSPIDMA_DST_INTR_ALL_MASK);
 290         /* Disable the GQSPI */
 291         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
 292         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 293         config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 294         /* Manual start */
 295         config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK;
 296         /* Little endian by default */
 297         config_reg &= ~GQSPI_CFG_ENDIAN_MASK;
 298         /* Disable poll time out */
 299         config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK;
 300         /* Set hold bit */
 301         config_reg |= GQSPI_CFG_WP_HOLD_MASK;
 302         /* Clear pre-scalar by default */
 303         config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 304         /* CPHA 0 */
 305         config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
 306         /* CPOL 0 */
 307         config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
 308         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 309
 310         /* Clear the TX and RX FIFO */
 311         zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST,
 312                            GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK |
 313                            GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK |
 314                            GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK);
 315         /* Set by default to allow for high frequencies */
 316         zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST,
 317                            zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) |
 318                            GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
 319         /* Reset thresholds */
 320         zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST,
 321                            GQSPI_TX_FIFO_THRESHOLD_RESET_VAL);
 322         zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST,
 323                            GQSPI_RX_FIFO_THRESHOLD);
 324         zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST,
 325                            GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL);
 326         zynqmp_gqspi_selectslave(xqspi,
 327                                  GQSPI_SELECT_FLASH_CS_LOWER,
 328                                  GQSPI_SELECT_FLASH_BUS_LOWER);
 329         /* Initialize DMA */
 330         zynqmp_gqspi_write(xqspi,
 331                            GQSPI_QSPIDMA_DST_CTRL_OFST,
 332                            GQSPI_QSPIDMA_DST_CTRL_RESET_VAL);
 333
 334         /* Enable the GQSPI */
 335         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
 336 }
 337
 338 /**
 339  * zynqmp_qspi_copy_read_data - Copy data to RX buffer
 340  * @xqspi:      Pointer to the zynqmp_qspi structure
 341  * @data:       The variable where data is stored
 342  * @size:       Number of bytes to be copied from data to RX buffer
 343  */
 344 static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi,
 345                                        ulong data, u8 size)
 346 {
 347         memcpy(xqspi->rxbuf, &data, size);
 348         xqspi->rxbuf += size;
 349         xqspi->bytes_to_receive -= size;
 350 }
 351
 352 /**
 353  * zynqmp_qspi_chipselect - Select or deselect the chip select line
 354  * @qspi:       Pointer to the spi_device structure
 355  * @is_high:    Select(0) or deselect (1) the chip select line
 356  */
 357 static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
 358 {
 359         struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
 360         ulong timeout;
 361         u32 genfifoentry = 0, statusreg;
 362
 363         genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
 364
 365         if (!is_high) {
 366                 xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
 367                 xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER;
 368                 genfifoentry |= xqspi->genfifobus;
 369                 genfifoentry |= xqspi->genfifocs;
 370                 genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
 371         } else {
 372                 genfifoentry |= GQSPI_GENFIFO_CS_HOLD;
 373         }
 374
 375         zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 376
 377         /* Manually start the generic FIFO command */
 378         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 379                            zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
 380                            GQSPI_CFG_START_GEN_FIFO_MASK);
 381
 382         timeout = jiffies + msecs_to_jiffies(1000);
 383
 384         /* Wait until the generic FIFO command is empty */
 385         do {
 386                 statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
 387
 388                 if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) &&
 389                     (statusreg & GQSPI_ISR_TXEMPTY_MASK))
 390                         break;
 391                 cpu_relax();
 392         } while (!time_after_eq(jiffies, timeout));
 393
 394         if (time_after_eq(jiffies, timeout))
 395                 dev_err(xqspi->dev, "Chip select timed out\n");
 396 }
 397
 398 /**
 399  * zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4.
 400  * @xqspi:      xqspi is a pointer to the GQSPI instance
 401  * @spimode:    spimode - SPI or DUAL or QUAD.
 402  * Return:      Mask to set desired SPI mode in GENFIFO entry.
 403  */
 404 static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
 405                                             u8 spimode)
 406 {
 407         u32 mask = 0;
 408
 409         switch (spimode) {
 410         case GQSPI_SELECT_MODE_DUALSPI:
 411                 mask = GQSPI_GENFIFO_MODE_DUALSPI;
 412                 break;
 413         case GQSPI_SELECT_MODE_QUADSPI:
 414                 mask = GQSPI_GENFIFO_MODE_QUADSPI;
 415                 break;
 416         case GQSPI_SELECT_MODE_SPI:
 417                 mask = GQSPI_GENFIFO_MODE_SPI;
 418                 break;
 419         default:
 420                 dev_warn(xqspi->dev, "Invalid SPI mode\n");
 421         }
 422
 423         return mask;
 424 }
 425
 426 /**
 427  * zynqmp_qspi_config_op - Configure QSPI controller for specified
 428  *                              transfer
 429  * @xqspi:      Pointer to the zynqmp_qspi structure
 430  * @qspi:       Pointer to the spi_device structure
 431  *
 432  * Sets the operational mode of QSPI controller for the next QSPI transfer and
 433  * sets the requested clock frequency.
 434  *
 435  * Return:      Always 0
 436  *
 437  * Note:
 438  *      If the requested frequency is not an exact match with what can be
 439  *      obtained using the pre-scalar value, the driver sets the clock
 440  *      frequency which is lower than the requested frequency (maximum lower)
 441  *      for the transfer.
 442  *
 443  *      If the requested frequency is higher or lower than that is supported
 444  *      by the QSPI controller the driver will set the highest or lowest
 445  *      frequency supported by controller.
 446  */
 447 static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
 448                                  struct spi_device *qspi)
 449 {
 450         ulong clk_rate;
 451         u32 config_reg, baud_rate_val = 0;
 452
 453         /* Set the clock frequency */
 454         /* If req_hz == 0, default to lowest speed */
 455         clk_rate = clk_get_rate(xqspi->refclk);
 456
 457         while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
 458                (clk_rate /
 459                 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > qspi->max_speed_hz)
 460                 baud_rate_val++;
 461
 462         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 463
 464         /* Set the QSPI clock phase and clock polarity */
 465         config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK);
 466
 467         if (qspi->mode & SPI_CPHA)
 468                 config_reg |= GQSPI_CFG_CLK_PHA_MASK;
 469         if (qspi->mode & SPI_CPOL)
 470                 config_reg |= GQSPI_CFG_CLK_POL_MASK;
 471
 472         config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 473         config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
 474         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 475         return 0;
 476 }
 477
 478 /**
 479  * zynqmp_qspi_setup_op - Configure the QSPI controller
 480  * @qspi:       Pointer to the spi_device structure
 481  *
 482  * Sets the operational mode of QSPI controller for the next QSPI transfer,
 483  * baud rate and divisor value to setup the requested qspi clock.
 484  *
 485  * Return:      0 on success; error value otherwise.
 486  */
 487 static int zynqmp_qspi_setup_op(struct spi_device *qspi)
 488 {
 489         struct spi_controller *ctlr = qspi->master;
 490         struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr);
 491
 492         if (ctlr->busy)
 493                 return -EBUSY;
 494
 495         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
 496
 497         return 0;
 498 }
 499
 500 /**
 501  * zynqmp_qspi_filltxfifo - Fills the TX FIFO as long as there is room in
 502  *                              the FIFO or the bytes required to be
 503  *                              transmitted.
 504  * @xqspi:      Pointer to the zynqmp_qspi structure
 505  * @size:       Number of bytes to be copied from TX buffer to TX FIFO
 506  */
 507 static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size)
 508 {
 509         u32 count = 0, intermediate;
 510
 511         while ((xqspi->bytes_to_transfer > 0) && (count < size) && (xqspi->txbuf)) {
 512                 memcpy(&intermediate, xqspi->txbuf, 4);
 513                 zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate);
 514
 515                 if (xqspi->bytes_to_transfer >= 4) {
 516                         xqspi->txbuf += 4;
 517                         xqspi->bytes_to_transfer -= 4;
 518                 } else {
 519                         xqspi->txbuf += xqspi->bytes_to_transfer;
 520                         xqspi->bytes_to_transfer = 0;
 521                 }
 522                 count++;
 523         }
 524 }
 525
 526 /**
 527  * zynqmp_qspi_readrxfifo - Fills the RX FIFO as long as there is room in
 528  *                              the FIFO.
 529  * @xqspi:      Pointer to the zynqmp_qspi structure
 530  * @size:       Number of bytes to be copied from RX buffer to RX FIFO
 531  */
 532 static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
 533 {
 534         ulong data;
 535         int count = 0;
 536
 537         while ((count < size) && (xqspi->bytes_to_receive > 0)) {
 538                 if (xqspi->bytes_to_receive >= 4) {
 539                         (*(u32 *)xqspi->rxbuf) =
 540                         zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
 541                         xqspi->rxbuf += 4;
 542                         xqspi->bytes_to_receive -= 4;
 543                         count += 4;
 544                 } else {
 545                         data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
 546                         count += xqspi->bytes_to_receive;
 547                         zynqmp_qspi_copy_read_data(xqspi, data,
 548                                                    xqspi->bytes_to_receive);
 549                         xqspi->bytes_to_receive = 0;
 550                 }
 551         }
 552 }
 553
 554 /**
 555  * zynqmp_qspi_fillgenfifo - Fills the GENFIFO.
 556  * @xqspi:      Pointer to the zynqmp_qspi structure
 557  * @nbits:      Transfer/Receive buswidth.
 558  * @genfifoentry:       Variable in which GENFIFO mask is saved
 559  */
 560 static void zynqmp_qspi_fillgenfifo(struct zynqmp_qspi *xqspi, u8 nbits,
 561                                     u32 genfifoentry)
 562 {
 563         u32 transfer_len = 0;
 564
 565         if (xqspi->txbuf) {
 566                 genfifoentry &= ~GQSPI_GENFIFO_RX;
 567                 genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
 568                 genfifoentry |= GQSPI_GENFIFO_TX;
 569                 transfer_len = xqspi->bytes_to_transfer;
 570         } else if (xqspi->rxbuf) {
 571                 genfifoentry &= ~GQSPI_GENFIFO_TX;
 572                 genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
 573                 genfifoentry |= GQSPI_GENFIFO_RX;
 574                 if (xqspi->mode == GQSPI_MODE_DMA)
 575                         transfer_len = xqspi->dma_rx_bytes;
 576                 else
 577                         transfer_len = xqspi->bytes_to_receive;
 578         } else {
 579                 /* Sending dummy circles here */
 580                 genfifoentry &= ~(GQSPI_GENFIFO_TX | GQSPI_GENFIFO_RX);
 581                 genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
 582                 transfer_len = xqspi->bytes_to_transfer;
 583         }
 584         genfifoentry |= zynqmp_qspi_selectspimode(xqspi, nbits);
 585         xqspi->genfifoentry = genfifoentry;
 586
 587         if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
 588                 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
 589                 genfifoentry |= transfer_len;
 590                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 591         } else {
 592                 int tempcount = transfer_len;
 593                 u32 exponent = 8;       /* 2^8 = 256 */
 594                 u8 imm_data = tempcount & 0xFF;
 595
 596                 tempcount &= ~(tempcount & 0xFF);
 597                 /* Immediate entry */
 598                 if (tempcount != 0) {
 599                         /* Exponent entries */
 600                         genfifoentry |= GQSPI_GENFIFO_EXP;
 601                         while (tempcount != 0) {
 602                                 if (tempcount & GQSPI_GENFIFO_EXP_START) {
 603                                         genfifoentry &=
 604                                                 ~GQSPI_GENFIFO_IMM_DATA_MASK;
 605                                         genfifoentry |= exponent;
 606                                         zynqmp_gqspi_write(xqspi,
 607                                                            GQSPI_GEN_FIFO_OFST,
 608                                                            genfifoentry);
 609                                 }
 610                                 tempcount = tempcount >> 1;
 611                                 exponent++;
 612                         }
 613                 }
 614                 if (imm_data != 0) {
 615                         genfifoentry &= ~GQSPI_GENFIFO_EXP;
 616                         genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
 617                         genfifoentry |= (u8)(imm_data & 0xFF);
 618                         zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST,
 619                                            genfifoentry);
 620                 }
 621         }
 622         if (xqspi->mode == GQSPI_MODE_IO && xqspi->rxbuf) {
 623                 /* Dummy generic FIFO entry */
 624                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
 625         }
 626 }
 627
 628 /**
 629  * zynqmp_process_dma_irq - Handler for DMA done interrupt of QSPI
 630  *                              controller
 631  * @xqspi:      zynqmp_qspi instance pointer
 632  *
 633  * This function handles DMA interrupt only.
 634  */
 635 static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
 636 {
 637         u32 config_reg, genfifoentry;
 638
 639         dma_unmap_single(xqspi->dev, xqspi->dma_addr,
 640                          xqspi->dma_rx_bytes, DMA_FROM_DEVICE);
 641         xqspi->rxbuf += xqspi->dma_rx_bytes;
 642         xqspi->bytes_to_receive -= xqspi->dma_rx_bytes;
 643         xqspi->dma_rx_bytes = 0;
 644
 645         /* Disabling the DMA interrupts */
 646         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST,
 647                            GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
 648
 649         if (xqspi->bytes_to_receive > 0) {
 650                 /* Switch to IO mode,for remaining bytes to receive */
 651                 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 652                 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 653                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 654
 655                 /* Initiate the transfer of remaining bytes */
 656                 genfifoentry = xqspi->genfifoentry;
 657                 genfifoentry |= xqspi->bytes_to_receive;
 658                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 659
 660                 /* Dummy generic FIFO entry */
 661                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
 662
 663                 /* Manual start */
 664                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 665                                    (zynqmp_gqspi_read(xqspi,
 666                                                       GQSPI_CONFIG_OFST) |
 667                                    GQSPI_CFG_START_GEN_FIFO_MASK));
 668
 669                 /* Enable the RX interrupts for IO mode */
 670                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 671                                    GQSPI_IER_GENFIFOEMPTY_MASK |
 672                                    GQSPI_IER_RXNEMPTY_MASK |
 673                                    GQSPI_IER_RXEMPTY_MASK);
 674         }
 675 }
 676
 677 /**
 678  * zynqmp_qspi_irq - Interrupt service routine of the QSPI controller
 679  * @irq:        IRQ number
 680  * @dev_id:     Pointer to the xqspi structure
 681  *
 682  * This function handles TX empty only.
 683  * On TX empty interrupt this function reads the received data from RX FIFO
 684  * and fills the TX FIFO if there is any data remaining to be transferred.
 685  *
 686  * Return:      IRQ_HANDLED when interrupt is handled
 687  *              IRQ_NONE otherwise.
 688  */
 689 static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 690 {
 691         struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id;
 692         irqreturn_t ret = IRQ_NONE;
 693         u32 status, mask, dma_status = 0;
 694
 695         status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
 696         zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status);
 697         mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST)));
 698
 699         /* Read and clear DMA status */
 700         if (xqspi->mode == GQSPI_MODE_DMA) {
 701                 dma_status =
 702                         zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST);
 703                 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
 704                                    dma_status);
 705         }
 706
 707         if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
 708                 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
 709                 ret = IRQ_HANDLED;
 710         }
 711
 712         if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
 713                 zynqmp_process_dma_irq(xqspi);
 714                 ret = IRQ_HANDLED;
 715         } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
 716                         (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
 717                 zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
 718                 ret = IRQ_HANDLED;
 719         }
 720
 721         if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 &&
 722             ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
 723                 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
 724                 complete(&xqspi->data_completion);
 725                 ret = IRQ_HANDLED;
 726         }
 727         return ret;
 728 }
 729
 730 /**
 731  * zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation
 732  * @xqspi:      xqspi is a pointer to the GQSPI instance.
 733  */
 734 static int zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
 735 {
 736         u32 rx_bytes, rx_rem, config_reg;
 737         dma_addr_t addr;
 738         u64 dma_align =  (u64)(uintptr_t)xqspi->rxbuf;
 739
 740         if (xqspi->bytes_to_receive < 8 ||
 741             ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) {
 742                 /* Setting to IO mode */
 743                 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 744                 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 745                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 746                 xqspi->mode = GQSPI_MODE_IO;
 747                 xqspi->dma_rx_bytes = 0;
 748                 return 0;
 749         }
 750
 751         rx_rem = xqspi->bytes_to_receive % 4;
 752         rx_bytes = (xqspi->bytes_to_receive - rx_rem);
 753
 754         addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf,
 755                               rx_bytes, DMA_FROM_DEVICE);
 756         if (dma_mapping_error(xqspi->dev, addr)) {
 757                 dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n");
 758                 return -ENOMEM;
 759         }
 760
 761         xqspi->dma_rx_bytes = rx_bytes;
 762         xqspi->dma_addr = addr;
 763         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST,
 764                            (u32)(addr & 0xffffffff));
 765         addr = ((addr >> 16) >> 16);
 766         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST,
 767                            ((u32)addr) & 0xfff);
 768
 769         /* Enabling the DMA mode */
 770         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 771         config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 772         config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK;
 773         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 774
 775         /* Switch to DMA mode */
 776         xqspi->mode = GQSPI_MODE_DMA;
 777
 778         /* Write the number of bytes to transfer */
 779         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes);
 780
 781         return 0;
 782 }
 783
 784 /**
 785  * zynqmp_qspi_write_op - This function sets up the GENFIFO entries,
 786  *                      TX FIFO, and fills the TX FIFO with as many
 787  *                      bytes as possible.
 788  * @xqspi:      Pointer to the GQSPI instance.
 789  * @tx_nbits:   Transfer buswidth.
 790  * @genfifoentry:       Variable in which GENFIFO mask is returned
 791  *                      to calling function
 792  */
 793 static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits,
 794                                  u32 genfifoentry)
 795 {
 796         u32 config_reg;
 797
 798         zynqmp_qspi_fillgenfifo(xqspi, tx_nbits, genfifoentry);
 799         zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
 800         if (xqspi->mode == GQSPI_MODE_DMA) {
 801                 config_reg = zynqmp_gqspi_read(xqspi,
 802                                                GQSPI_CONFIG_OFST);
 803                 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 804                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 805                                    config_reg);
 806                 xqspi->mode = GQSPI_MODE_IO;
 807         }
 808 }
 809
 810 /**
 811  * zynqmp_qspi_read_op - This function sets up the GENFIFO entries and
 812  *                              RX DMA operation.
 813  * @xqspi:      xqspi is a pointer to the GQSPI instance.
 814  * @rx_nbits:   Receive buswidth.
 815  * @genfifoentry:       genfifoentry is pointer to the variable in which
 816  *                      GENFIFO mask is returned to calling function
 817  */
 818 static int zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits,
 819                                 u32 genfifoentry)
 820 {
 821         int ret;
 822
 823         ret = zynqmp_qspi_setuprxdma(xqspi);
 824         if (ret)
 825                 return ret;
 826         zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry);
 827
 828         return 0;
 829 }
 830
 831 /**
 832  * zynqmp_qspi_suspend - Suspend method for the QSPI driver
 833  * @dev:        Address of the platform_device structure
 834  *
 835  * This function stops the QSPI driver queue and disables the QSPI controller
 836  *
 837  * Return:      Always 0
 838  */
 839 static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
 840 {
 841         struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
 842         struct spi_controller *ctlr = xqspi->ctlr;
 843         int ret;
 844
 845         ret = spi_controller_suspend(ctlr);
 846         if (ret)
 847                 return ret;
 848
 849         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
 850
 851         return 0;
 852 }
 853
 854 /**
 855  * zynqmp_qspi_resume - Resume method for the QSPI driver
 856  * @dev:        Address of the platform_device structure
 857  *
 858  * The function starts the QSPI driver queue and initializes the QSPI
 859  * controller
 860  *
 861  * Return:      0 on success; error value otherwise
 862  */
 863 static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
 864 {
 865         struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
 866         struct spi_controller *ctlr = xqspi->ctlr;
 867
 868         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
 869
 870         spi_controller_resume(ctlr);
 871
 872         return 0;
 873 }
 874
 875 /**
 876  * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver
 877  * @dev:        Address of the platform_device structure
 878  *
 879  * This function disables the clocks
 880  *
 881  * Return:      Always 0
 882  */
 883 static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)
 884 {
 885         struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
 886
 887         clk_disable_unprepare(xqspi->refclk);
 888         clk_disable_unprepare(xqspi->pclk);
 889
 890         return 0;
 891 }
 892
 893 /**
 894  * zynqmp_runtime_resume - Runtime resume method for the SPI driver
 895  * @dev:        Address of the platform_device structure
 896  *
 897  * This function enables the clocks
 898  *
 899  * Return:      0 on success and error value on error
 900  */
 901 static int __maybe_unused zynqmp_runtime_resume(struct device *dev)
 902 {
 903         struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
 904         int ret;
 905
 906         ret = clk_prepare_enable(xqspi->pclk);
 907         if (ret) {
 908                 dev_err(dev, "Cannot enable APB clock.\n");
 909                 return ret;
 910         }
 911
 912         ret = clk_prepare_enable(xqspi->refclk);
 913         if (ret) {
 914                 dev_err(dev, "Cannot enable device clock.\n");
 915                 clk_disable_unprepare(xqspi->pclk);
 916                 return ret;
 917         }
 918
 919         return 0;
 920 }
 921
 922 /**
 923  * zynqmp_qspi_exec_op() - Initiates the QSPI transfer
 924  * @mem: The SPI memory
 925  * @op: The memory operation to execute
 926  *
 927  * Executes a memory operation.
 928  *
 929  * This function first selects the chip and starts the memory operation.
 930  *
 931  * Return: 0 in case of success, a negative error code otherwise.
 932  */
 933 static int zynqmp_qspi_exec_op(struct spi_mem *mem,
 934                                const struct spi_mem_op *op)
 935 {
 936         struct zynqmp_qspi *xqspi = spi_controller_get_devdata
 937                                     (mem->spi->master);
 938         int err = 0, i;
 939         u32 genfifoentry = 0;
 940         u16 opcode = op->cmd.opcode;
 941         u64 opaddr;
 942
 943         dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n",
 944                 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
 945                 op->dummy.buswidth, op->data.buswidth);
 946
 947         mutex_lock(&xqspi->op_lock);
 948         zynqmp_qspi_config_op(xqspi, mem->spi);
 949         zynqmp_qspi_chipselect(mem->spi, false);
 950         genfifoentry |= xqspi->genfifocs;
 951         genfifoentry |= xqspi->genfifobus;
 952
 953         if (op->cmd.opcode) {
 954                 reinit_completion(&xqspi->data_completion);
 955                 xqspi->txbuf = &opcode;
 956                 xqspi->rxbuf = NULL;
 957                 xqspi->bytes_to_transfer = op->cmd.nbytes;
 958                 xqspi->bytes_to_receive = 0;
 959                 zynqmp_qspi_write_op(xqspi, op->cmd.buswidth, genfifoentry);
 960                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 961                                    zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
 962                                    GQSPI_CFG_START_GEN_FIFO_MASK);
 963                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 964                                    GQSPI_IER_GENFIFOEMPTY_MASK |
 965                                    GQSPI_IER_TXNOT_FULL_MASK);
 966                 if (!wait_for_completion_timeout
 967                     (&xqspi->data_completion, msecs_to_jiffies(1000))) {
 968                         err = -ETIMEDOUT;
 969                         goto return_err;
 970                 }
 971         }
 972
 973         if (op->addr.nbytes) {
 974                 xqspi->txbuf = &opaddr;
 975                 for (i = 0; i < op->addr.nbytes; i++) {
 976                         *(((u8 *)xqspi->txbuf) + i) = op->addr.val >>
 977                                         (8 * (op->addr.nbytes - i - 1));
 978                 }
 979
 980                 reinit_completion(&xqspi->data_completion);
 981                 xqspi->rxbuf = NULL;
 982                 xqspi->bytes_to_transfer = op->addr.nbytes;
 983                 xqspi->bytes_to_receive = 0;
 984                 zynqmp_qspi_write_op(xqspi, op->addr.buswidth, genfifoentry);
 985                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 986                                    zynqmp_gqspi_read(xqspi,
 987                                                      GQSPI_CONFIG_OFST) |
 988                                    GQSPI_CFG_START_GEN_FIFO_MASK);
 989                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 990                                    GQSPI_IER_TXEMPTY_MASK |
 991                                    GQSPI_IER_GENFIFOEMPTY_MASK |
 992                                    GQSPI_IER_TXNOT_FULL_MASK);
 993                 if (!wait_for_completion_timeout
 994                     (&xqspi->data_completion, msecs_to_jiffies(1000))) {
 995                         err = -ETIMEDOUT;
 996                         goto return_err;
 997                 }
 998         }
 999
1000         if (op->dummy.nbytes) {
1001                 xqspi->txbuf = NULL;
1002                 xqspi->rxbuf = NULL;
1003                 /*
1004                  * xqspi->bytes_to_transfer here represents the dummy circles
1005                  * which need to be sent.
1006                  */
1007                 xqspi->bytes_to_transfer = op->dummy.nbytes * 8 / op->dummy.buswidth;
1008                 xqspi->bytes_to_receive = 0;
1009                 /*
1010                  * Using op->data.buswidth instead of op->dummy.buswidth here because
1011                  * we need to use it to configure the correct SPI mode.
1012                  */
1013                 zynqmp_qspi_write_op(xqspi, op->data.buswidth,
1014                                      genfifoentry);
1015                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1016                                    zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
1017                                    GQSPI_CFG_START_GEN_FIFO_MASK);
1018         }
1019
1020         if (op->data.nbytes) {
1021                 reinit_completion(&xqspi->data_completion);
1022                 if (op->data.dir == SPI_MEM_DATA_OUT) {
1023                         xqspi->txbuf = (u8 *)op->data.buf.out;
1024                         xqspi->rxbuf = NULL;
1025                         xqspi->bytes_to_transfer = op->data.nbytes;
1026                         xqspi->bytes_to_receive = 0;
1027                         zynqmp_qspi_write_op(xqspi, op->data.buswidth,
1028                                              genfifoentry);
1029                         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1030                                            zynqmp_gqspi_read
1031                                            (xqspi, GQSPI_CONFIG_OFST) |
1032                                            GQSPI_CFG_START_GEN_FIFO_MASK);
1033                         zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1034                                            GQSPI_IER_TXEMPTY_MASK |
1035                                            GQSPI_IER_GENFIFOEMPTY_MASK |
1036                                            GQSPI_IER_TXNOT_FULL_MASK);
1037                 } else {
1038                         xqspi->txbuf = NULL;
1039                         xqspi->rxbuf = (u8 *)op->data.buf.in;
1040                         xqspi->bytes_to_receive = op->data.nbytes;
1041                         xqspi->bytes_to_transfer = 0;
1042                         err = zynqmp_qspi_read_op(xqspi, op->data.buswidth,
1043                                             genfifoentry);
1044                         if (err)
1045                                 goto return_err;
1046
1047                         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1048                                            zynqmp_gqspi_read
1049                                            (xqspi, GQSPI_CONFIG_OFST) |
1050                                            GQSPI_CFG_START_GEN_FIFO_MASK);
1051                         if (xqspi->mode == GQSPI_MODE_DMA) {
1052                                 zynqmp_gqspi_write
1053                                         (xqspi, GQSPI_QSPIDMA_DST_I_EN_OFST,
1054                                          GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
1055                         } else {
1056                                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1057                                                    GQSPI_IER_GENFIFOEMPTY_MASK |
1058                                                    GQSPI_IER_RXNEMPTY_MASK |
1059                                                    GQSPI_IER_RXEMPTY_MASK);
1060                         }
1061                 }
1062                 if (!wait_for_completion_timeout
1063                     (&xqspi->data_completion, msecs_to_jiffies(1000)))
1064                         err = -ETIMEDOUT;
1065         }
1066
1067 return_err:
1068
1069         zynqmp_qspi_chipselect(mem->spi, true);
1070         mutex_unlock(&xqspi->op_lock);
1071
1072         return err;
1073 }
1074
1075 static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
1076         SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend,
1077                            zynqmp_runtime_resume, NULL)
1078         SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)
1079 };
1080
1081 static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
1082         .exec_op = zynqmp_qspi_exec_op,
1083 };
1084
1085 /**
1086  * zynqmp_qspi_probe - Probe method for the QSPI driver
1087  * @pdev:       Pointer to the platform_device structure
1088  *
1089  * This function initializes the driver data structures and the hardware.
1090  *
1091  * Return:      0 on success; error value otherwise
1092  */
1093 static int zynqmp_qspi_probe(struct platform_device *pdev)
1094 {
1095         int ret = 0;
1096         struct spi_controller *ctlr;
1097         struct zynqmp_qspi *xqspi;
1098         struct device *dev = &pdev->dev;
1099         struct device_node *np = dev->of_node;
1100
1101         ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
1102         if (!ctlr)
1103                 return -ENOMEM;
1104
1105         xqspi = spi_controller_get_devdata(ctlr);
1106         xqspi->dev = dev;
1107         xqspi->ctlr = ctlr;
1108         platform_set_drvdata(pdev, xqspi);
1109
1110         xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
1111         if (IS_ERR(xqspi->regs)) {
1112                 ret = PTR_ERR(xqspi->regs);
1113                 goto remove_master;
1114         }
1115
1116         xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
1117         if (IS_ERR(xqspi->pclk)) {
1118                 dev_err(dev, "pclk clock not found.\n");
1119                 ret = PTR_ERR(xqspi->pclk);
1120                 goto remove_master;
1121         }
1122
1123         xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
1124         if (IS_ERR(xqspi->refclk)) {
1125                 dev_err(dev, "ref_clk clock not found.\n");
1126                 ret = PTR_ERR(xqspi->refclk);
1127                 goto remove_master;
1128         }
1129
1130         ret = clk_prepare_enable(xqspi->pclk);
1131         if (ret) {
1132                 dev_err(dev, "Unable to enable APB clock.\n");
1133                 goto remove_master;
1134         }
1135
1136         ret = clk_prepare_enable(xqspi->refclk);
1137         if (ret) {
1138                 dev_err(dev, "Unable to enable device clock.\n");
1139                 goto clk_dis_pclk;
1140         }
1141
1142         init_completion(&xqspi->data_completion);
1143
1144         mutex_init(&xqspi->op_lock);
1145
1146         pm_runtime_use_autosuspend(&pdev->dev);
1147         pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
1148         pm_runtime_set_active(&pdev->dev);
1149         pm_runtime_enable(&pdev->dev);
1150         /* QSPI controller initializations */
1151         zynqmp_qspi_init_hw(xqspi);
1152
1153         pm_runtime_mark_last_busy(&pdev->dev);
1154         pm_runtime_put_autosuspend(&pdev->dev);
1155         xqspi->irq = platform_get_irq(pdev, 0);
1156         if (xqspi->irq <= 0) {
1157                 ret = -ENXIO;
1158                 goto clk_dis_all;
1159         }
1160         ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
1161                                0, pdev->name, xqspi);
1162         if (ret != 0) {
1163                 ret = -ENXIO;
1164                 dev_err(dev, "request_irq failed\n");
1165                 goto clk_dis_all;
1166         }
1167
1168         ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
1169         if (ret)
1170                 goto clk_dis_all;
1171
1172         ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
1173         ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS;
1174         ctlr->mem_ops = &zynqmp_qspi_mem_ops;
1175         ctlr->setup = zynqmp_qspi_setup_op;
1176         ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
1177         ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
1178         ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
1179                             SPI_TX_DUAL | SPI_TX_QUAD;
1180         ctlr->dev.of_node = np;
1181
1182         ret = devm_spi_register_controller(&pdev->dev, ctlr);
1183         if (ret) {
1184                 dev_err(&pdev->dev, "spi_register_controller failed\n");
1185                 goto clk_dis_all;
1186         }
1187
1188         return 0;
1189
1190 clk_dis_all:
1191         pm_runtime_set_suspended(&pdev->dev);
1192         pm_runtime_disable(&pdev->dev);
1193         clk_disable_unprepare(xqspi->refclk);
1194 clk_dis_pclk:
1195         clk_disable_unprepare(xqspi->pclk);
1196 remove_master:
1197         spi_controller_put(ctlr);
1198
1199         return ret;
1200 }
1201
1202 /**
1203  * zynqmp_qspi_remove - Remove method for the QSPI driver
1204  * @pdev:       Pointer to the platform_device structure
1205  *
1206  * This function is called if a device is physically removed from the system or
1207  * if the driver module is being unloaded. It frees all resources allocated to
1208  * the device.
1209  *
1210  * Return:      0 Always
1211  */
1212 static int zynqmp_qspi_remove(struct platform_device *pdev)
1213 {
1214         struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev);
1215
1216         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
1217         clk_disable_unprepare(xqspi->refclk);
1218         clk_disable_unprepare(xqspi->pclk);
1219         pm_runtime_set_suspended(&pdev->dev);
1220         pm_runtime_disable(&pdev->dev);
1221
1222         return 0;
1223 }
1224
1225 static const struct of_device_id zynqmp_qspi_of_match[] = {
1226         { .compatible = "xlnx,zynqmp-qspi-1.0", },
1227         { /* End of table */ }
1228 };
1229
1230 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
1231
1232 static struct platform_driver zynqmp_qspi_driver = {
1233         .probe = zynqmp_qspi_probe,
1234         .remove = zynqmp_qspi_remove,
1235         .driver = {
1236                 .name = "zynqmp-qspi",
1237                 .of_match_table = zynqmp_qspi_of_match,
1238                 .pm = &zynqmp_qspi_dev_pm_ops,
1239         },
1240 };
1241
1242 module_platform_driver(zynqmp_qspi_driver);
1243
1244 MODULE_AUTHOR("Xilinx, Inc.");
1245 MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver");
1246 MODULE_LICENSE("GPL");