2 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * Copyright (C) 2010 Samsung Electronics Co. Ltd.
6 * Jaswinder Singh <jassi.brar@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/string.h>
20 #include <linux/delay.h>
21 #include <linux/interrupt.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/dmaengine.h>
24 #include <linux/amba/bus.h>
25 #include <linux/amba/pl330.h>
26 #include <linux/scatterlist.h>
28 #include <linux/of_dma.h>
29 #include <linux/err.h>
30 #include <linux/pm_runtime.h>
32 #include "dmaengine.h"
33 #define PL330_MAX_CHAN 8
34 #define PL330_MAX_IRQS 32
35 #define PL330_MAX_PERI 32
36 #define PL330_MAX_BURST 16
38 #define PL330_QUIRK_BROKEN_NO_FLUSHP BIT(0)
40 enum pl330_cachectrl {
41 CCTRL0, /* Noncacheable and nonbufferable */
42 CCTRL1, /* Bufferable only */
43 CCTRL2, /* Cacheable, but do not allocate */
44 CCTRL3, /* Cacheable and bufferable, but do not allocate */
45 INVALID1, /* AWCACHE = 0x1000 */
47 CCTRL6, /* Cacheable write-through, allocate on writes only */
48 CCTRL7, /* Cacheable write-back, allocate on writes only */
59 /* Register and Bit field Definitions */
61 #define DS_ST_STOP 0x0
62 #define DS_ST_EXEC 0x1
63 #define DS_ST_CMISS 0x2
64 #define DS_ST_UPDTPC 0x3
66 #define DS_ST_ATBRR 0x5
67 #define DS_ST_QBUSY 0x6
69 #define DS_ST_KILL 0x8
70 #define DS_ST_CMPLT 0x9
71 #define DS_ST_FLTCMP 0xe
72 #define DS_ST_FAULT 0xf
77 #define INTSTATUS 0x28
84 #define FTC(n) (_FTC + (n)*0x4)
87 #define CS(n) (_CS + (n)*0x8)
88 #define CS_CNS (1 << 21)
91 #define CPC(n) (_CPC + (n)*0x8)
94 #define SA(n) (_SA + (n)*0x20)
97 #define DA(n) (_DA + (n)*0x20)
100 #define CC(n) (_CC + (n)*0x20)
102 #define CC_SRCINC (1 << 0)
103 #define CC_DSTINC (1 << 14)
104 #define CC_SRCPRI (1 << 8)
105 #define CC_DSTPRI (1 << 22)
106 #define CC_SRCNS (1 << 9)
107 #define CC_DSTNS (1 << 23)
108 #define CC_SRCIA (1 << 10)
109 #define CC_DSTIA (1 << 24)
110 #define CC_SRCBRSTLEN_SHFT 4
111 #define CC_DSTBRSTLEN_SHFT 18
112 #define CC_SRCBRSTSIZE_SHFT 1
113 #define CC_DSTBRSTSIZE_SHFT 15
114 #define CC_SRCCCTRL_SHFT 11
115 #define CC_SRCCCTRL_MASK 0x7
116 #define CC_DSTCCTRL_SHFT 25
117 #define CC_DRCCCTRL_MASK 0x7
118 #define CC_SWAP_SHFT 28
121 #define LC0(n) (_LC0 + (n)*0x20)
124 #define LC1(n) (_LC1 + (n)*0x20)
126 #define DBGSTATUS 0xd00
127 #define DBG_BUSY (1 << 0)
130 #define DBGINST0 0xd08
131 #define DBGINST1 0xd0c
140 #define PERIPH_ID 0xfe0
141 #define PERIPH_REV_SHIFT 20
142 #define PERIPH_REV_MASK 0xf
143 #define PERIPH_REV_R0P0 0
144 #define PERIPH_REV_R1P0 1
145 #define PERIPH_REV_R1P1 2
147 #define CR0_PERIPH_REQ_SET (1 << 0)
148 #define CR0_BOOT_EN_SET (1 << 1)
149 #define CR0_BOOT_MAN_NS (1 << 2)
150 #define CR0_NUM_CHANS_SHIFT 4
151 #define CR0_NUM_CHANS_MASK 0x7
152 #define CR0_NUM_PERIPH_SHIFT 12
153 #define CR0_NUM_PERIPH_MASK 0x1f
154 #define CR0_NUM_EVENTS_SHIFT 17
155 #define CR0_NUM_EVENTS_MASK 0x1f
157 #define CR1_ICACHE_LEN_SHIFT 0
158 #define CR1_ICACHE_LEN_MASK 0x7
159 #define CR1_NUM_ICACHELINES_SHIFT 4
160 #define CR1_NUM_ICACHELINES_MASK 0xf
162 #define CRD_DATA_WIDTH_SHIFT 0
163 #define CRD_DATA_WIDTH_MASK 0x7
164 #define CRD_WR_CAP_SHIFT 4
165 #define CRD_WR_CAP_MASK 0x7
166 #define CRD_WR_Q_DEP_SHIFT 8
167 #define CRD_WR_Q_DEP_MASK 0xf
168 #define CRD_RD_CAP_SHIFT 12
169 #define CRD_RD_CAP_MASK 0x7
170 #define CRD_RD_Q_DEP_SHIFT 16
171 #define CRD_RD_Q_DEP_MASK 0xf
172 #define CRD_DATA_BUFF_SHIFT 20
173 #define CRD_DATA_BUFF_MASK 0x3ff
176 #define DESIGNER 0x41
178 #define INTEG_CFG 0x0
179 #define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12))
181 #define PL330_STATE_STOPPED (1 << 0)
182 #define PL330_STATE_EXECUTING (1 << 1)
183 #define PL330_STATE_WFE (1 << 2)
184 #define PL330_STATE_FAULTING (1 << 3)
185 #define PL330_STATE_COMPLETING (1 << 4)
186 #define PL330_STATE_WFP (1 << 5)
187 #define PL330_STATE_KILLING (1 << 6)
188 #define PL330_STATE_FAULT_COMPLETING (1 << 7)
189 #define PL330_STATE_CACHEMISS (1 << 8)
190 #define PL330_STATE_UPDTPC (1 << 9)
191 #define PL330_STATE_ATBARRIER (1 << 10)
192 #define PL330_STATE_QUEUEBUSY (1 << 11)
193 #define PL330_STATE_INVALID (1 << 15)
195 #define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
196 | PL330_STATE_WFE | PL330_STATE_FAULTING)
198 #define CMD_DMAADDH 0x54
199 #define CMD_DMAEND 0x00
200 #define CMD_DMAFLUSHP 0x35
201 #define CMD_DMAGO 0xa0
202 #define CMD_DMALD 0x04
203 #define CMD_DMALDP 0x25
204 #define CMD_DMALP 0x20
205 #define CMD_DMALPEND 0x28
206 #define CMD_DMAKILL 0x01
207 #define CMD_DMAMOV 0xbc
208 #define CMD_DMANOP 0x18
209 #define CMD_DMARMB 0x12
210 #define CMD_DMASEV 0x34
211 #define CMD_DMAST 0x08
212 #define CMD_DMASTP 0x29
213 #define CMD_DMASTZ 0x0c
214 #define CMD_DMAWFE 0x36
215 #define CMD_DMAWFP 0x30
216 #define CMD_DMAWMB 0x13
220 #define SZ_DMAFLUSHP 2
224 #define SZ_DMALPEND 2
238 #define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
239 #define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
241 #define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
242 #define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
245 * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
246 * at 1byte/burst for P<->M and M<->M respectively.
247 * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
248 * should be enough for P<->M and M<->M respectively.
250 #define MCODE_BUFF_PER_REQ 256
252 /* Use this _only_ to wait on transient states */
253 #define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
255 #ifdef PL330_DEBUG_MCGEN
256 static unsigned cmd_line;
257 #define PL330_DBGCMD_DUMP(off, x...) do { \
258 printk("%x:", cmd_line); \
262 #define PL330_DBGMC_START(addr) (cmd_line = addr)
264 #define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
265 #define PL330_DBGMC_START(addr) do {} while (0)
268 /* The number of default descriptors */
270 #define NR_DEFAULT_DESC 16
272 /* Delay for runtime PM autosuspend, ms */
273 #define PL330_AUTOSUSPEND_DELAY 20
275 /* Populated by the PL330 core driver for DMA API driver's info */
276 struct pl330_config {
278 #define DMAC_MODE_NS (1 << 0)
280 unsigned int data_bus_width:10; /* In number of bits */
281 unsigned int data_buf_dep:11;
282 unsigned int num_chan:4;
283 unsigned int num_peri:6;
285 unsigned int num_events:6;
290 * Request Configuration.
291 * The PL330 core does not modify this and uses the last
292 * working configuration if the request doesn't provide any.
294 * The Client may want to provide this info only for the
295 * first request and a request with new settings.
297 struct pl330_reqcfg {
298 /* Address Incrementing */
303 * For now, the SRC & DST protection levels
304 * and burst size/length are assumed same.
310 unsigned brst_size:3; /* in power of 2 */
312 enum pl330_cachectrl dcctl;
313 enum pl330_cachectrl scctl;
314 enum pl330_byteswap swap;
315 struct pl330_config *pcfg;
319 * One cycle of DMAC operation.
320 * There may be more than one xfer in a request.
329 /* The xfer callbacks are made with one of these arguments. */
331 /* The all xfers in the request were success. */
333 /* If req aborted due to global error. */
335 /* If req failed due to problem with Channel. */
356 struct dma_pl330_desc;
361 struct dma_pl330_desc *desc;
364 /* ToBeDone for tasklet */
372 struct pl330_thread {
375 /* If the channel is not yet acquired by any client */
378 struct pl330_dmac *dmac;
379 /* Only two at a time */
380 struct _pl330_req req[2];
381 /* Index of the last enqueued request */
383 /* Index of the last submitted request or -1 if the DMA is stopped */
387 enum pl330_dmac_state {
394 /* In the DMAC pool */
397 * Allocated to some channel during prep_xxx
398 * Also may be sitting on the work_list.
402 * Sitting on the work_list and already submitted
403 * to the PL330 core. Not more than two descriptors
404 * of a channel can be BUSY at any time.
408 * Sitting on the channel work_list but xfer done
414 struct dma_pl330_chan {
415 /* Schedule desc completion */
416 struct tasklet_struct task;
418 /* DMA-Engine Channel */
419 struct dma_chan chan;
421 /* List of submitted descriptors */
422 struct list_head submitted_list;
423 /* List of issued descriptors */
424 struct list_head work_list;
425 /* List of completed descriptors */
426 struct list_head completed_list;
428 /* Pointer to the DMAC that manages this channel,
429 * NULL if the channel is available to be acquired.
430 * As the parent, this DMAC also provides descriptors
433 struct pl330_dmac *dmac;
435 /* To protect channel manipulation */
439 * Hardware channel thread of PL330 DMAC. NULL if the channel is
442 struct pl330_thread *thread;
444 /* For D-to-M and M-to-D channels */
445 int burst_sz; /* the peripheral fifo width */
446 int burst_len; /* the number of burst */
447 dma_addr_t fifo_addr;
449 /* for cyclic capability */
452 /* for runtime pm tracking */
457 /* DMA-Engine Device */
458 struct dma_device ddma;
460 /* Holds info about sg limitations */
461 struct device_dma_parameters dma_parms;
463 /* Pool of descriptors available for the DMAC's channels */
464 struct list_head desc_pool;
465 /* To protect desc_pool manipulation */
466 spinlock_t pool_lock;
468 /* Size of MicroCode buffers for each channel. */
470 /* ioremap'ed address of PL330 registers. */
472 /* Populated by the PL330 core driver during pl330_add */
473 struct pl330_config pcfg;
476 /* Maximum possible events/irqs */
478 /* BUS address of MicroCode buffer */
479 dma_addr_t mcode_bus;
480 /* CPU address of MicroCode buffer */
482 /* List of all Channel threads */
483 struct pl330_thread *channels;
484 /* Pointer to the MANAGER thread */
485 struct pl330_thread *manager;
486 /* To handle bad news in interrupt */
487 struct tasklet_struct tasks;
488 struct _pl330_tbd dmac_tbd;
489 /* State of DMAC operation */
490 enum pl330_dmac_state state;
491 /* Holds list of reqs with due callbacks */
492 struct list_head req_done;
494 /* Peripheral channels connected to this DMAC */
495 unsigned int num_peripherals;
496 struct dma_pl330_chan *peripherals; /* keep at end */
500 static struct pl330_of_quirks {
505 .quirk = "arm,pl330-broken-no-flushp",
506 .id = PL330_QUIRK_BROKEN_NO_FLUSHP,
510 struct dma_pl330_desc {
511 /* To attach to a queue as child */
512 struct list_head node;
514 /* Descriptor for the DMA Engine API */
515 struct dma_async_tx_descriptor txd;
517 /* Xfer for PL330 core */
518 struct pl330_xfer px;
520 struct pl330_reqcfg rqcfg;
522 enum desc_status status;
527 /* The channel which currently holds this desc */
528 struct dma_pl330_chan *pchan;
530 enum dma_transfer_direction rqtype;
531 /* Index of peripheral for the xfer. */
533 /* Hook to attach to DMAC's list of reqs with due callback */
534 struct list_head rqd;
539 struct dma_pl330_desc *desc;
542 static inline bool _queue_empty(struct pl330_thread *thrd)
544 return thrd->req[0].desc == NULL && thrd->req[1].desc == NULL;
547 static inline bool _queue_full(struct pl330_thread *thrd)
549 return thrd->req[0].desc != NULL && thrd->req[1].desc != NULL;
552 static inline bool is_manager(struct pl330_thread *thrd)
554 return thrd->dmac->manager == thrd;
557 /* If manager of the thread is in Non-Secure mode */
558 static inline bool _manager_ns(struct pl330_thread *thrd)
560 return (thrd->dmac->pcfg.mode & DMAC_MODE_NS) ? true : false;
563 static inline u32 get_revision(u32 periph_id)
565 return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK;
568 static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[],
569 enum pl330_dst da, u16 val)
574 buf[0] = CMD_DMAADDH;
576 *((__le16 *)&buf[1]) = cpu_to_le16(val);
578 PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n",
579 da == 1 ? "DA" : "SA", val);
584 static inline u32 _emit_END(unsigned dry_run, u8 buf[])
591 PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
596 static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
601 buf[0] = CMD_DMAFLUSHP;
607 PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3);
612 static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond)
620 buf[0] |= (0 << 1) | (1 << 0);
621 else if (cond == BURST)
622 buf[0] |= (1 << 1) | (1 << 0);
624 PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n",
625 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
630 static inline u32 _emit_LDP(unsigned dry_run, u8 buf[],
631 enum pl330_cond cond, u8 peri)
645 PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n",
646 cond == SINGLE ? 'S' : 'B', peri >> 3);
651 static inline u32 _emit_LP(unsigned dry_run, u8 buf[],
652 unsigned loop, u8 cnt)
662 cnt--; /* DMAC increments by 1 internally */
665 PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt);
671 enum pl330_cond cond;
677 static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[],
678 const struct _arg_LPEND *arg)
680 enum pl330_cond cond = arg->cond;
681 bool forever = arg->forever;
682 unsigned loop = arg->loop;
683 u8 bjump = arg->bjump;
688 buf[0] = CMD_DMALPEND;
697 buf[0] |= (0 << 1) | (1 << 0);
698 else if (cond == BURST)
699 buf[0] |= (1 << 1) | (1 << 0);
703 PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n",
704 forever ? "FE" : "END",
705 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'),
712 static inline u32 _emit_KILL(unsigned dry_run, u8 buf[])
717 buf[0] = CMD_DMAKILL;
722 static inline u32 _emit_MOV(unsigned dry_run, u8 buf[],
723 enum dmamov_dst dst, u32 val)
730 *((__le32 *)&buf[2]) = cpu_to_le32(val);
732 PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n",
733 dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val);
738 static inline u32 _emit_NOP(unsigned dry_run, u8 buf[])
745 PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n");
750 static inline u32 _emit_RMB(unsigned dry_run, u8 buf[])
757 PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n");
762 static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev)
773 PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3);
778 static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond)
786 buf[0] |= (0 << 1) | (1 << 0);
787 else if (cond == BURST)
788 buf[0] |= (1 << 1) | (1 << 0);
790 PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n",
791 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
796 static inline u32 _emit_STP(unsigned dry_run, u8 buf[],
797 enum pl330_cond cond, u8 peri)
811 PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n",
812 cond == SINGLE ? 'S' : 'B', peri >> 3);
817 static inline u32 _emit_STZ(unsigned dry_run, u8 buf[])
824 PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n");
829 static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev,
844 PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n",
845 ev >> 3, invalidate ? ", I" : "");
850 static inline u32 _emit_WFP(unsigned dry_run, u8 buf[],
851 enum pl330_cond cond, u8 peri)
859 buf[0] |= (0 << 1) | (0 << 0);
860 else if (cond == BURST)
861 buf[0] |= (1 << 1) | (0 << 0);
863 buf[0] |= (0 << 1) | (1 << 0);
869 PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n",
870 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3);
875 static inline u32 _emit_WMB(unsigned dry_run, u8 buf[])
882 PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n");
893 static inline u32 _emit_GO(unsigned dry_run, u8 buf[],
894 const struct _arg_GO *arg)
897 u32 addr = arg->addr;
898 unsigned ns = arg->ns;
908 *((__le32 *)&buf[2]) = cpu_to_le32(addr);
913 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
915 /* Returns Time-Out */
916 static bool _until_dmac_idle(struct pl330_thread *thrd)
918 void __iomem *regs = thrd->dmac->base;
919 unsigned long loops = msecs_to_loops(5);
922 /* Until Manager is Idle */
923 if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
935 static inline void _execute_DBGINSN(struct pl330_thread *thrd,
936 u8 insn[], bool as_manager)
938 void __iomem *regs = thrd->dmac->base;
941 val = (insn[0] << 16) | (insn[1] << 24);
944 val |= (thrd->id << 8); /* Channel Number */
946 writel(val, regs + DBGINST0);
948 val = le32_to_cpu(*((__le32 *)&insn[2]));
949 writel(val, regs + DBGINST1);
951 /* If timed out due to halted state-machine */
952 if (_until_dmac_idle(thrd)) {
953 dev_err(thrd->dmac->ddma.dev, "DMAC halted!\n");
958 writel(0, regs + DBGCMD);
961 static inline u32 _state(struct pl330_thread *thrd)
963 void __iomem *regs = thrd->dmac->base;
966 if (is_manager(thrd))
967 val = readl(regs + DS) & 0xf;
969 val = readl(regs + CS(thrd->id)) & 0xf;
973 return PL330_STATE_STOPPED;
975 return PL330_STATE_EXECUTING;
977 return PL330_STATE_CACHEMISS;
979 return PL330_STATE_UPDTPC;
981 return PL330_STATE_WFE;
983 return PL330_STATE_FAULTING;
985 if (is_manager(thrd))
986 return PL330_STATE_INVALID;
988 return PL330_STATE_ATBARRIER;
990 if (is_manager(thrd))
991 return PL330_STATE_INVALID;
993 return PL330_STATE_QUEUEBUSY;
995 if (is_manager(thrd))
996 return PL330_STATE_INVALID;
998 return PL330_STATE_WFP;
1000 if (is_manager(thrd))
1001 return PL330_STATE_INVALID;
1003 return PL330_STATE_KILLING;
1005 if (is_manager(thrd))
1006 return PL330_STATE_INVALID;
1008 return PL330_STATE_COMPLETING;
1010 if (is_manager(thrd))
1011 return PL330_STATE_INVALID;
1013 return PL330_STATE_FAULT_COMPLETING;
1015 return PL330_STATE_INVALID;
1019 static void _stop(struct pl330_thread *thrd)
1021 void __iomem *regs = thrd->dmac->base;
1022 u8 insn[6] = {0, 0, 0, 0, 0, 0};
1023 u32 inten = readl(regs + INTEN);
1025 if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
1026 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
1028 /* Return if nothing needs to be done */
1029 if (_state(thrd) == PL330_STATE_COMPLETING
1030 || _state(thrd) == PL330_STATE_KILLING
1031 || _state(thrd) == PL330_STATE_STOPPED)
1034 _emit_KILL(0, insn);
1036 _execute_DBGINSN(thrd, insn, is_manager(thrd));
1038 /* clear the event */
1039 if (inten & (1 << thrd->ev))
1040 writel(1 << thrd->ev, regs + INTCLR);
1041 /* Stop generating interrupts for SEV */
1042 writel(inten & ~(1 << thrd->ev), regs + INTEN);
1045 /* Start doing req 'idx' of thread 'thrd' */
1046 static bool _trigger(struct pl330_thread *thrd)
1048 void __iomem *regs = thrd->dmac->base;
1049 struct _pl330_req *req;
1050 struct dma_pl330_desc *desc;
1053 u8 insn[6] = {0, 0, 0, 0, 0, 0};
1056 /* Return if already ACTIVE */
1057 if (_state(thrd) != PL330_STATE_STOPPED)
1060 idx = 1 - thrd->lstenq;
1061 if (thrd->req[idx].desc != NULL) {
1062 req = &thrd->req[idx];
1065 if (thrd->req[idx].desc != NULL)
1066 req = &thrd->req[idx];
1071 /* Return if no request */
1075 /* Return if req is running */
1076 if (idx == thrd->req_running)
1081 ns = desc->rqcfg.nonsecure ? 1 : 0;
1083 /* See 'Abort Sources' point-4 at Page 2-25 */
1084 if (_manager_ns(thrd) && !ns)
1085 dev_info(thrd->dmac->ddma.dev, "%s:%d Recipe for ABORT!\n",
1086 __func__, __LINE__);
1089 go.addr = req->mc_bus;
1091 _emit_GO(0, insn, &go);
1093 /* Set to generate interrupts for SEV */
1094 writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
1096 /* Only manager can execute GO */
1097 _execute_DBGINSN(thrd, insn, true);
1099 thrd->req_running = idx;
1104 static bool _start(struct pl330_thread *thrd)
1106 switch (_state(thrd)) {
1107 case PL330_STATE_FAULT_COMPLETING:
1108 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
1110 if (_state(thrd) == PL330_STATE_KILLING)
1111 UNTIL(thrd, PL330_STATE_STOPPED)
1113 case PL330_STATE_FAULTING:
1116 case PL330_STATE_KILLING:
1117 case PL330_STATE_COMPLETING:
1118 UNTIL(thrd, PL330_STATE_STOPPED)
1120 case PL330_STATE_STOPPED:
1121 return _trigger(thrd);
1123 case PL330_STATE_WFP:
1124 case PL330_STATE_QUEUEBUSY:
1125 case PL330_STATE_ATBARRIER:
1126 case PL330_STATE_UPDTPC:
1127 case PL330_STATE_CACHEMISS:
1128 case PL330_STATE_EXECUTING:
1131 case PL330_STATE_WFE: /* For RESUME, nothing yet */
1137 static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
1138 const struct _xfer_spec *pxs, int cyc)
1141 struct pl330_config *pcfg = pxs->desc->rqcfg.pcfg;
1143 /* check lock-up free version */
1144 if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) {
1146 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1147 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1151 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1152 off += _emit_RMB(dry_run, &buf[off]);
1153 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1154 off += _emit_WMB(dry_run, &buf[off]);
1161 static inline int _ldst_devtomem(struct pl330_dmac *pl330, unsigned dry_run,
1162 u8 buf[], const struct _xfer_spec *pxs,
1166 enum pl330_cond cond;
1168 if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
1174 off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
1175 off += _emit_LDP(dry_run, &buf[off], cond, pxs->desc->peri);
1176 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1178 if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
1179 off += _emit_FLUSHP(dry_run, &buf[off],
1186 static inline int _ldst_memtodev(struct pl330_dmac *pl330,
1187 unsigned dry_run, u8 buf[],
1188 const struct _xfer_spec *pxs, int cyc)
1191 enum pl330_cond cond;
1193 if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
1199 off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
1200 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1201 off += _emit_STP(dry_run, &buf[off], cond, pxs->desc->peri);
1203 if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
1204 off += _emit_FLUSHP(dry_run, &buf[off],
1211 static int _bursts(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
1212 const struct _xfer_spec *pxs, int cyc)
1216 switch (pxs->desc->rqtype) {
1217 case DMA_MEM_TO_DEV:
1218 off += _ldst_memtodev(pl330, dry_run, &buf[off], pxs, cyc);
1220 case DMA_DEV_TO_MEM:
1221 off += _ldst_devtomem(pl330, dry_run, &buf[off], pxs, cyc);
1223 case DMA_MEM_TO_MEM:
1224 off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
1227 off += 0x40000000; /* Scare off the Client */
1234 /* Returns bytes consumed and updates bursts */
1235 static inline int _loop(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
1236 unsigned long *bursts, const struct _xfer_spec *pxs)
1238 int cyc, cycmax, szlp, szlpend, szbrst, off;
1239 unsigned lcnt0, lcnt1, ljmp0, ljmp1;
1240 struct _arg_LPEND lpend;
1243 return _bursts(pl330, dry_run, buf, pxs, 1);
1245 /* Max iterations possible in DMALP is 256 */
1246 if (*bursts >= 256*256) {
1249 cyc = *bursts / lcnt1 / lcnt0;
1250 } else if (*bursts > 256) {
1252 lcnt0 = *bursts / lcnt1;
1260 szlp = _emit_LP(1, buf, 0, 0);
1261 szbrst = _bursts(pl330, 1, buf, pxs, 1);
1263 lpend.cond = ALWAYS;
1264 lpend.forever = false;
1267 szlpend = _emit_LPEND(1, buf, &lpend);
1275 * Max bursts that we can unroll due to limit on the
1276 * size of backward jump that can be encoded in DMALPEND
1277 * which is 8-bits and hence 255
1279 cycmax = (255 - (szlp + szlpend)) / szbrst;
1281 cyc = (cycmax < cyc) ? cycmax : cyc;
1286 off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
1290 off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
1293 off += _bursts(pl330, dry_run, &buf[off], pxs, cyc);
1295 lpend.cond = ALWAYS;
1296 lpend.forever = false;
1298 lpend.bjump = off - ljmp1;
1299 off += _emit_LPEND(dry_run, &buf[off], &lpend);
1302 lpend.cond = ALWAYS;
1303 lpend.forever = false;
1305 lpend.bjump = off - ljmp0;
1306 off += _emit_LPEND(dry_run, &buf[off], &lpend);
1309 *bursts = lcnt1 * cyc;
1316 static inline int _setup_loops(struct pl330_dmac *pl330,
1317 unsigned dry_run, u8 buf[],
1318 const struct _xfer_spec *pxs)
1320 struct pl330_xfer *x = &pxs->desc->px;
1322 unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
1327 off += _loop(pl330, dry_run, &buf[off], &c, pxs);
1334 static inline int _setup_xfer(struct pl330_dmac *pl330,
1335 unsigned dry_run, u8 buf[],
1336 const struct _xfer_spec *pxs)
1338 struct pl330_xfer *x = &pxs->desc->px;
1341 /* DMAMOV SAR, x->src_addr */
1342 off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
1343 /* DMAMOV DAR, x->dst_addr */
1344 off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
1347 off += _setup_loops(pl330, dry_run, &buf[off], pxs);
1353 * A req is a sequence of one or more xfer units.
1354 * Returns the number of bytes taken to setup the MC for the req.
1356 static int _setup_req(struct pl330_dmac *pl330, unsigned dry_run,
1357 struct pl330_thread *thrd, unsigned index,
1358 struct _xfer_spec *pxs)
1360 struct _pl330_req *req = &thrd->req[index];
1361 struct pl330_xfer *x;
1362 u8 *buf = req->mc_cpu;
1365 PL330_DBGMC_START(req->mc_bus);
1367 /* DMAMOV CCR, ccr */
1368 off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
1371 /* Error if xfer length is not aligned at burst size */
1372 if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
1375 off += _setup_xfer(pl330, dry_run, &buf[off], pxs);
1377 /* DMASEV peripheral/event */
1378 off += _emit_SEV(dry_run, &buf[off], thrd->ev);
1380 off += _emit_END(dry_run, &buf[off]);
1385 static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
1395 /* We set same protection levels for Src and DST for now */
1396 if (rqc->privileged)
1397 ccr |= CC_SRCPRI | CC_DSTPRI;
1399 ccr |= CC_SRCNS | CC_DSTNS;
1400 if (rqc->insnaccess)
1401 ccr |= CC_SRCIA | CC_DSTIA;
1403 ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
1404 ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
1406 ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
1407 ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
1409 ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
1410 ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
1412 ccr |= (rqc->swap << CC_SWAP_SHFT);
1418 * Submit a list of xfers after which the client wants notification.
1419 * Client is not notified after each xfer unit, just once after all
1420 * xfer units are done or some error occurs.
1422 static int pl330_submit_req(struct pl330_thread *thrd,
1423 struct dma_pl330_desc *desc)
1425 struct pl330_dmac *pl330 = thrd->dmac;
1426 struct _xfer_spec xs;
1427 unsigned long flags;
1432 if (pl330->state == DYING
1433 || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) {
1434 dev_info(thrd->dmac->ddma.dev, "%s:%d\n",
1435 __func__, __LINE__);
1439 /* If request for non-existing peripheral */
1440 if (desc->rqtype != DMA_MEM_TO_MEM &&
1441 desc->peri >= pl330->pcfg.num_peri) {
1442 dev_info(thrd->dmac->ddma.dev,
1443 "%s:%d Invalid peripheral(%u)!\n",
1444 __func__, __LINE__, desc->peri);
1448 spin_lock_irqsave(&pl330->lock, flags);
1450 if (_queue_full(thrd)) {
1455 /* Prefer Secure Channel */
1456 if (!_manager_ns(thrd))
1457 desc->rqcfg.nonsecure = 0;
1459 desc->rqcfg.nonsecure = 1;
1461 ccr = _prepare_ccr(&desc->rqcfg);
1463 idx = thrd->req[0].desc == NULL ? 0 : 1;
1468 /* First dry run to check if req is acceptable */
1469 ret = _setup_req(pl330, 1, thrd, idx, &xs);
1473 if (ret > pl330->mcbufsz / 2) {
1474 dev_info(pl330->ddma.dev, "%s:%d Try increasing mcbufsz (%i/%i)\n",
1475 __func__, __LINE__, ret, pl330->mcbufsz / 2);
1480 /* Hook the request */
1482 thrd->req[idx].desc = desc;
1483 _setup_req(pl330, 0, thrd, idx, &xs);
1488 spin_unlock_irqrestore(&pl330->lock, flags);
1493 static void dma_pl330_rqcb(struct dma_pl330_desc *desc, enum pl330_op_err err)
1495 struct dma_pl330_chan *pch;
1496 unsigned long flags;
1503 /* If desc aborted */
1507 spin_lock_irqsave(&pch->lock, flags);
1509 desc->status = DONE;
1511 spin_unlock_irqrestore(&pch->lock, flags);
1513 tasklet_schedule(&pch->task);
1516 static void pl330_dotask(unsigned long data)
1518 struct pl330_dmac *pl330 = (struct pl330_dmac *) data;
1519 unsigned long flags;
1522 spin_lock_irqsave(&pl330->lock, flags);
1524 /* The DMAC itself gone nuts */
1525 if (pl330->dmac_tbd.reset_dmac) {
1526 pl330->state = DYING;
1527 /* Reset the manager too */
1528 pl330->dmac_tbd.reset_mngr = true;
1529 /* Clear the reset flag */
1530 pl330->dmac_tbd.reset_dmac = false;
1533 if (pl330->dmac_tbd.reset_mngr) {
1534 _stop(pl330->manager);
1535 /* Reset all channels */
1536 pl330->dmac_tbd.reset_chan = (1 << pl330->pcfg.num_chan) - 1;
1537 /* Clear the reset flag */
1538 pl330->dmac_tbd.reset_mngr = false;
1541 for (i = 0; i < pl330->pcfg.num_chan; i++) {
1543 if (pl330->dmac_tbd.reset_chan & (1 << i)) {
1544 struct pl330_thread *thrd = &pl330->channels[i];
1545 void __iomem *regs = pl330->base;
1546 enum pl330_op_err err;
1550 if (readl(regs + FSC) & (1 << thrd->id))
1551 err = PL330_ERR_FAIL;
1553 err = PL330_ERR_ABORT;
1555 spin_unlock_irqrestore(&pl330->lock, flags);
1556 dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, err);
1557 dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, err);
1558 spin_lock_irqsave(&pl330->lock, flags);
1560 thrd->req[0].desc = NULL;
1561 thrd->req[1].desc = NULL;
1562 thrd->req_running = -1;
1564 /* Clear the reset flag */
1565 pl330->dmac_tbd.reset_chan &= ~(1 << i);
1569 spin_unlock_irqrestore(&pl330->lock, flags);
1574 /* Returns 1 if state was updated, 0 otherwise */
1575 static int pl330_update(struct pl330_dmac *pl330)
1577 struct dma_pl330_desc *descdone;
1578 unsigned long flags;
1581 int id, ev, ret = 0;
1585 spin_lock_irqsave(&pl330->lock, flags);
1587 val = readl(regs + FSM) & 0x1;
1589 pl330->dmac_tbd.reset_mngr = true;
1591 pl330->dmac_tbd.reset_mngr = false;
1593 val = readl(regs + FSC) & ((1 << pl330->pcfg.num_chan) - 1);
1594 pl330->dmac_tbd.reset_chan |= val;
1597 while (i < pl330->pcfg.num_chan) {
1598 if (val & (1 << i)) {
1599 dev_info(pl330->ddma.dev,
1600 "Reset Channel-%d\t CS-%x FTC-%x\n",
1601 i, readl(regs + CS(i)),
1602 readl(regs + FTC(i)));
1603 _stop(&pl330->channels[i]);
1609 /* Check which event happened i.e, thread notified */
1610 val = readl(regs + ES);
1611 if (pl330->pcfg.num_events < 32
1612 && val & ~((1 << pl330->pcfg.num_events) - 1)) {
1613 pl330->dmac_tbd.reset_dmac = true;
1614 dev_err(pl330->ddma.dev, "%s:%d Unexpected!\n", __func__,
1620 for (ev = 0; ev < pl330->pcfg.num_events; ev++) {
1621 if (val & (1 << ev)) { /* Event occurred */
1622 struct pl330_thread *thrd;
1623 u32 inten = readl(regs + INTEN);
1626 /* Clear the event */
1627 if (inten & (1 << ev))
1628 writel(1 << ev, regs + INTCLR);
1632 id = pl330->events[ev];
1634 thrd = &pl330->channels[id];
1636 active = thrd->req_running;
1637 if (active == -1) /* Aborted */
1640 /* Detach the req */
1641 descdone = thrd->req[active].desc;
1642 thrd->req[active].desc = NULL;
1644 thrd->req_running = -1;
1646 /* Get going again ASAP */
1649 /* For now, just make a list of callbacks to be done */
1650 list_add_tail(&descdone->rqd, &pl330->req_done);
1654 /* Now that we are in no hurry, do the callbacks */
1655 while (!list_empty(&pl330->req_done)) {
1656 descdone = list_first_entry(&pl330->req_done,
1657 struct dma_pl330_desc, rqd);
1658 list_del(&descdone->rqd);
1659 spin_unlock_irqrestore(&pl330->lock, flags);
1660 dma_pl330_rqcb(descdone, PL330_ERR_NONE);
1661 spin_lock_irqsave(&pl330->lock, flags);
1665 spin_unlock_irqrestore(&pl330->lock, flags);
1667 if (pl330->dmac_tbd.reset_dmac
1668 || pl330->dmac_tbd.reset_mngr
1669 || pl330->dmac_tbd.reset_chan) {
1671 tasklet_schedule(&pl330->tasks);
1677 /* Reserve an event */
1678 static inline int _alloc_event(struct pl330_thread *thrd)
1680 struct pl330_dmac *pl330 = thrd->dmac;
1683 for (ev = 0; ev < pl330->pcfg.num_events; ev++)
1684 if (pl330->events[ev] == -1) {
1685 pl330->events[ev] = thrd->id;
1692 static bool _chan_ns(const struct pl330_dmac *pl330, int i)
1694 return pl330->pcfg.irq_ns & (1 << i);
1697 /* Upon success, returns IdentityToken for the
1698 * allocated channel, NULL otherwise.
1700 static struct pl330_thread *pl330_request_channel(struct pl330_dmac *pl330)
1702 struct pl330_thread *thrd = NULL;
1705 if (pl330->state == DYING)
1708 chans = pl330->pcfg.num_chan;
1710 for (i = 0; i < chans; i++) {
1711 thrd = &pl330->channels[i];
1712 if ((thrd->free) && (!_manager_ns(thrd) ||
1713 _chan_ns(pl330, i))) {
1714 thrd->ev = _alloc_event(thrd);
1715 if (thrd->ev >= 0) {
1718 thrd->req[0].desc = NULL;
1719 thrd->req[1].desc = NULL;
1720 thrd->req_running = -1;
1730 /* Release an event */
1731 static inline void _free_event(struct pl330_thread *thrd, int ev)
1733 struct pl330_dmac *pl330 = thrd->dmac;
1735 /* If the event is valid and was held by the thread */
1736 if (ev >= 0 && ev < pl330->pcfg.num_events
1737 && pl330->events[ev] == thrd->id)
1738 pl330->events[ev] = -1;
1741 static void pl330_release_channel(struct pl330_thread *thrd)
1743 struct pl330_dmac *pl330;
1745 if (!thrd || thrd->free)
1750 dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, PL330_ERR_ABORT);
1751 dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, PL330_ERR_ABORT);
1755 _free_event(thrd, thrd->ev);
1759 /* Initialize the structure for PL330 configuration, that can be used
1760 * by the client driver the make best use of the DMAC
1762 static void read_dmac_config(struct pl330_dmac *pl330)
1764 void __iomem *regs = pl330->base;
1767 val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
1768 val &= CRD_DATA_WIDTH_MASK;
1769 pl330->pcfg.data_bus_width = 8 * (1 << val);
1771 val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
1772 val &= CRD_DATA_BUFF_MASK;
1773 pl330->pcfg.data_buf_dep = val + 1;
1775 val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
1776 val &= CR0_NUM_CHANS_MASK;
1778 pl330->pcfg.num_chan = val;
1780 val = readl(regs + CR0);
1781 if (val & CR0_PERIPH_REQ_SET) {
1782 val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
1784 pl330->pcfg.num_peri = val;
1785 pl330->pcfg.peri_ns = readl(regs + CR4);
1787 pl330->pcfg.num_peri = 0;
1790 val = readl(regs + CR0);
1791 if (val & CR0_BOOT_MAN_NS)
1792 pl330->pcfg.mode |= DMAC_MODE_NS;
1794 pl330->pcfg.mode &= ~DMAC_MODE_NS;
1796 val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
1797 val &= CR0_NUM_EVENTS_MASK;
1799 pl330->pcfg.num_events = val;
1801 pl330->pcfg.irq_ns = readl(regs + CR3);
1804 static inline void _reset_thread(struct pl330_thread *thrd)
1806 struct pl330_dmac *pl330 = thrd->dmac;
1808 thrd->req[0].mc_cpu = pl330->mcode_cpu
1809 + (thrd->id * pl330->mcbufsz);
1810 thrd->req[0].mc_bus = pl330->mcode_bus
1811 + (thrd->id * pl330->mcbufsz);
1812 thrd->req[0].desc = NULL;
1814 thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
1815 + pl330->mcbufsz / 2;
1816 thrd->req[1].mc_bus = thrd->req[0].mc_bus
1817 + pl330->mcbufsz / 2;
1818 thrd->req[1].desc = NULL;
1820 thrd->req_running = -1;
1823 static int dmac_alloc_threads(struct pl330_dmac *pl330)
1825 int chans = pl330->pcfg.num_chan;
1826 struct pl330_thread *thrd;
1829 /* Allocate 1 Manager and 'chans' Channel threads */
1830 pl330->channels = kzalloc((1 + chans) * sizeof(*thrd),
1832 if (!pl330->channels)
1835 /* Init Channel threads */
1836 for (i = 0; i < chans; i++) {
1837 thrd = &pl330->channels[i];
1840 _reset_thread(thrd);
1844 /* MANAGER is indexed at the end */
1845 thrd = &pl330->channels[chans];
1849 pl330->manager = thrd;
1854 static int dmac_alloc_resources(struct pl330_dmac *pl330)
1856 int chans = pl330->pcfg.num_chan;
1860 * Alloc MicroCode buffer for 'chans' Channel threads.
1861 * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
1863 pl330->mcode_cpu = dma_alloc_coherent(pl330->ddma.dev,
1864 chans * pl330->mcbufsz,
1865 &pl330->mcode_bus, GFP_KERNEL);
1866 if (!pl330->mcode_cpu) {
1867 dev_err(pl330->ddma.dev, "%s:%d Can't allocate memory!\n",
1868 __func__, __LINE__);
1872 ret = dmac_alloc_threads(pl330);
1874 dev_err(pl330->ddma.dev, "%s:%d Can't to create channels for DMAC!\n",
1875 __func__, __LINE__);
1876 dma_free_coherent(pl330->ddma.dev,
1877 chans * pl330->mcbufsz,
1878 pl330->mcode_cpu, pl330->mcode_bus);
1885 static int pl330_add(struct pl330_dmac *pl330)
1892 /* Check if we can handle this DMAC */
1893 if ((pl330->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) {
1894 dev_err(pl330->ddma.dev, "PERIPH_ID 0x%x !\n",
1895 pl330->pcfg.periph_id);
1899 /* Read the configuration of the DMAC */
1900 read_dmac_config(pl330);
1902 if (pl330->pcfg.num_events == 0) {
1903 dev_err(pl330->ddma.dev, "%s:%d Can't work without events!\n",
1904 __func__, __LINE__);
1908 spin_lock_init(&pl330->lock);
1910 INIT_LIST_HEAD(&pl330->req_done);
1912 /* Use default MC buffer size if not provided */
1913 if (!pl330->mcbufsz)
1914 pl330->mcbufsz = MCODE_BUFF_PER_REQ * 2;
1916 /* Mark all events as free */
1917 for (i = 0; i < pl330->pcfg.num_events; i++)
1918 pl330->events[i] = -1;
1920 /* Allocate resources needed by the DMAC */
1921 ret = dmac_alloc_resources(pl330);
1923 dev_err(pl330->ddma.dev, "Unable to create channels for DMAC\n");
1927 tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330);
1929 pl330->state = INIT;
1934 static int dmac_free_threads(struct pl330_dmac *pl330)
1936 struct pl330_thread *thrd;
1939 /* Release Channel threads */
1940 for (i = 0; i < pl330->pcfg.num_chan; i++) {
1941 thrd = &pl330->channels[i];
1942 pl330_release_channel(thrd);
1946 kfree(pl330->channels);
1951 static void pl330_del(struct pl330_dmac *pl330)
1953 pl330->state = UNINIT;
1955 tasklet_kill(&pl330->tasks);
1957 /* Free DMAC resources */
1958 dmac_free_threads(pl330);
1960 dma_free_coherent(pl330->ddma.dev,
1961 pl330->pcfg.num_chan * pl330->mcbufsz, pl330->mcode_cpu,
1965 /* forward declaration */
1966 static struct amba_driver pl330_driver;
1968 static inline struct dma_pl330_chan *
1969 to_pchan(struct dma_chan *ch)
1974 return container_of(ch, struct dma_pl330_chan, chan);
1977 static inline struct dma_pl330_desc *
1978 to_desc(struct dma_async_tx_descriptor *tx)
1980 return container_of(tx, struct dma_pl330_desc, txd);
1983 static inline void fill_queue(struct dma_pl330_chan *pch)
1985 struct dma_pl330_desc *desc;
1988 list_for_each_entry(desc, &pch->work_list, node) {
1990 /* If already submitted */
1991 if (desc->status == BUSY)
1994 ret = pl330_submit_req(pch->thread, desc);
1996 desc->status = BUSY;
1997 } else if (ret == -EAGAIN) {
1998 /* QFull or DMAC Dying */
2001 /* Unacceptable request */
2002 desc->status = DONE;
2003 dev_err(pch->dmac->ddma.dev, "%s:%d Bad Desc(%d)\n",
2004 __func__, __LINE__, desc->txd.cookie);
2005 tasklet_schedule(&pch->task);
2010 static void pl330_tasklet(unsigned long data)
2012 struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
2013 struct dma_pl330_desc *desc, *_dt;
2014 unsigned long flags;
2015 bool power_down = false;
2017 spin_lock_irqsave(&pch->lock, flags);
2019 /* Pick up ripe tomatoes */
2020 list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
2021 if (desc->status == DONE) {
2023 dma_cookie_complete(&desc->txd);
2024 list_move_tail(&desc->node, &pch->completed_list);
2027 /* Try to submit a req imm. next to the last completed cookie */
2030 if (list_empty(&pch->work_list)) {
2031 spin_lock(&pch->thread->dmac->lock);
2033 spin_unlock(&pch->thread->dmac->lock);
2035 pch->active = false;
2037 /* Make sure the PL330 Channel thread is active */
2038 spin_lock(&pch->thread->dmac->lock);
2039 _start(pch->thread);
2040 spin_unlock(&pch->thread->dmac->lock);
2043 while (!list_empty(&pch->completed_list)) {
2044 struct dmaengine_desc_callback cb;
2046 desc = list_first_entry(&pch->completed_list,
2047 struct dma_pl330_desc, node);
2049 dmaengine_desc_get_callback(&desc->txd, &cb);
2052 desc->status = PREP;
2053 list_move_tail(&desc->node, &pch->work_list);
2056 spin_lock(&pch->thread->dmac->lock);
2057 _start(pch->thread);
2058 spin_unlock(&pch->thread->dmac->lock);
2062 desc->status = FREE;
2063 list_move_tail(&desc->node, &pch->dmac->desc_pool);
2066 dma_descriptor_unmap(&desc->txd);
2068 if (dmaengine_desc_callback_valid(&cb)) {
2069 spin_unlock_irqrestore(&pch->lock, flags);
2070 dmaengine_desc_callback_invoke(&cb, NULL);
2071 spin_lock_irqsave(&pch->lock, flags);
2074 spin_unlock_irqrestore(&pch->lock, flags);
2076 /* If work list empty, power down */
2078 pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2079 pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
2083 bool pl330_filter(struct dma_chan *chan, void *param)
2087 if (chan->device->dev->driver != &pl330_driver.drv)
2090 peri_id = chan->private;
2091 return *peri_id == (unsigned long)param;
2093 EXPORT_SYMBOL(pl330_filter);
2095 static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
2096 struct of_dma *ofdma)
2098 int count = dma_spec->args_count;
2099 struct pl330_dmac *pl330 = ofdma->of_dma_data;
2100 unsigned int chan_id;
2108 chan_id = dma_spec->args[0];
2109 if (chan_id >= pl330->num_peripherals)
2112 return dma_get_slave_channel(&pl330->peripherals[chan_id].chan);
2115 static int pl330_alloc_chan_resources(struct dma_chan *chan)
2117 struct dma_pl330_chan *pch = to_pchan(chan);
2118 struct pl330_dmac *pl330 = pch->dmac;
2119 unsigned long flags;
2121 spin_lock_irqsave(&pl330->lock, flags);
2123 dma_cookie_init(chan);
2124 pch->cyclic = false;
2126 pch->thread = pl330_request_channel(pl330);
2128 spin_unlock_irqrestore(&pl330->lock, flags);
2132 tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch);
2134 spin_unlock_irqrestore(&pl330->lock, flags);
2139 static int pl330_config(struct dma_chan *chan,
2140 struct dma_slave_config *slave_config)
2142 struct dma_pl330_chan *pch = to_pchan(chan);
2144 if (slave_config->direction == DMA_MEM_TO_DEV) {
2145 if (slave_config->dst_addr)
2146 pch->fifo_addr = slave_config->dst_addr;
2147 if (slave_config->dst_addr_width)
2148 pch->burst_sz = __ffs(slave_config->dst_addr_width);
2149 if (slave_config->dst_maxburst)
2150 pch->burst_len = slave_config->dst_maxburst;
2151 } else if (slave_config->direction == DMA_DEV_TO_MEM) {
2152 if (slave_config->src_addr)
2153 pch->fifo_addr = slave_config->src_addr;
2154 if (slave_config->src_addr_width)
2155 pch->burst_sz = __ffs(slave_config->src_addr_width);
2156 if (slave_config->src_maxburst)
2157 pch->burst_len = slave_config->src_maxburst;
2163 static int pl330_terminate_all(struct dma_chan *chan)
2165 struct dma_pl330_chan *pch = to_pchan(chan);
2166 struct dma_pl330_desc *desc;
2167 unsigned long flags;
2168 struct pl330_dmac *pl330 = pch->dmac;
2170 bool power_down = false;
2172 pm_runtime_get_sync(pl330->ddma.dev);
2173 spin_lock_irqsave(&pch->lock, flags);
2175 spin_lock(&pl330->lock);
2177 pch->thread->req[0].desc = NULL;
2178 pch->thread->req[1].desc = NULL;
2179 pch->thread->req_running = -1;
2180 spin_unlock(&pl330->lock);
2182 power_down = pch->active;
2183 pch->active = false;
2185 /* Mark all desc done */
2186 list_for_each_entry(desc, &pch->submitted_list, node) {
2187 desc->status = FREE;
2188 dma_cookie_complete(&desc->txd);
2191 list_for_each_entry(desc, &pch->work_list , node) {
2192 desc->status = FREE;
2193 dma_cookie_complete(&desc->txd);
2196 list_splice_tail_init(&pch->submitted_list, &pl330->desc_pool);
2197 list_splice_tail_init(&pch->work_list, &pl330->desc_pool);
2198 list_splice_tail_init(&pch->completed_list, &pl330->desc_pool);
2199 spin_unlock_irqrestore(&pch->lock, flags);
2200 pm_runtime_mark_last_busy(pl330->ddma.dev);
2202 pm_runtime_put_autosuspend(pl330->ddma.dev);
2203 pm_runtime_put_autosuspend(pl330->ddma.dev);
2209 * We don't support DMA_RESUME command because of hardware
2210 * limitations, so after pausing the channel we cannot restore
2211 * it to active state. We have to terminate channel and setup
2212 * DMA transfer again. This pause feature was implemented to
2213 * allow safely read residue before channel termination.
2215 static int pl330_pause(struct dma_chan *chan)
2217 struct dma_pl330_chan *pch = to_pchan(chan);
2218 struct pl330_dmac *pl330 = pch->dmac;
2219 unsigned long flags;
2221 pm_runtime_get_sync(pl330->ddma.dev);
2222 spin_lock_irqsave(&pch->lock, flags);
2224 spin_lock(&pl330->lock);
2226 spin_unlock(&pl330->lock);
2228 spin_unlock_irqrestore(&pch->lock, flags);
2229 pm_runtime_mark_last_busy(pl330->ddma.dev);
2230 pm_runtime_put_autosuspend(pl330->ddma.dev);
2235 static void pl330_free_chan_resources(struct dma_chan *chan)
2237 struct dma_pl330_chan *pch = to_pchan(chan);
2238 struct pl330_dmac *pl330 = pch->dmac;
2239 unsigned long flags;
2241 tasklet_kill(&pch->task);
2243 pm_runtime_get_sync(pch->dmac->ddma.dev);
2244 spin_lock_irqsave(&pl330->lock, flags);
2246 pl330_release_channel(pch->thread);
2250 list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
2252 spin_unlock_irqrestore(&pl330->lock, flags);
2253 pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2254 pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
2257 static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch,
2258 struct dma_pl330_desc *desc)
2260 struct pl330_thread *thrd = pch->thread;
2261 struct pl330_dmac *pl330 = pch->dmac;
2262 void __iomem *regs = thrd->dmac->base;
2265 pm_runtime_get_sync(pl330->ddma.dev);
2267 if (desc->rqcfg.src_inc) {
2268 val = readl(regs + SA(thrd->id));
2269 addr = desc->px.src_addr;
2271 val = readl(regs + DA(thrd->id));
2272 addr = desc->px.dst_addr;
2274 pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
2275 pm_runtime_put_autosuspend(pl330->ddma.dev);
2279 static enum dma_status
2280 pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
2281 struct dma_tx_state *txstate)
2283 enum dma_status ret;
2284 unsigned long flags;
2285 struct dma_pl330_desc *desc, *running = NULL, *last_enq = NULL;
2286 struct dma_pl330_chan *pch = to_pchan(chan);
2287 unsigned int transferred, residual = 0;
2289 ret = dma_cookie_status(chan, cookie, txstate);
2294 if (ret == DMA_COMPLETE)
2297 spin_lock_irqsave(&pch->lock, flags);
2298 spin_lock(&pch->thread->dmac->lock);
2300 if (pch->thread->req_running != -1)
2301 running = pch->thread->req[pch->thread->req_running].desc;
2303 last_enq = pch->thread->req[pch->thread->lstenq].desc;
2305 /* Check in pending list */
2306 list_for_each_entry(desc, &pch->work_list, node) {
2307 if (desc->status == DONE)
2308 transferred = desc->bytes_requested;
2309 else if (running && desc == running)
2311 pl330_get_current_xferred_count(pch, desc);
2312 else if (desc->status == BUSY)
2314 * Busy but not running means either just enqueued,
2315 * or finished and not yet marked done
2317 if (desc == last_enq)
2320 transferred = desc->bytes_requested;
2323 residual += desc->bytes_requested - transferred;
2324 if (desc->txd.cookie == cookie) {
2325 switch (desc->status) {
2331 ret = DMA_IN_PROGRESS;
2341 spin_unlock(&pch->thread->dmac->lock);
2342 spin_unlock_irqrestore(&pch->lock, flags);
2345 dma_set_residue(txstate, residual);
2350 static void pl330_issue_pending(struct dma_chan *chan)
2352 struct dma_pl330_chan *pch = to_pchan(chan);
2353 unsigned long flags;
2355 spin_lock_irqsave(&pch->lock, flags);
2356 if (list_empty(&pch->work_list)) {
2358 * Warn on nothing pending. Empty submitted_list may
2359 * break our pm_runtime usage counter as it is
2360 * updated on work_list emptiness status.
2362 WARN_ON(list_empty(&pch->submitted_list));
2364 pm_runtime_get_sync(pch->dmac->ddma.dev);
2366 list_splice_tail_init(&pch->submitted_list, &pch->work_list);
2367 spin_unlock_irqrestore(&pch->lock, flags);
2369 pl330_tasklet((unsigned long)pch);
2373 * We returned the last one of the circular list of descriptor(s)
2374 * from prep_xxx, so the argument to submit corresponds to the last
2375 * descriptor of the list.
2377 static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
2379 struct dma_pl330_desc *desc, *last = to_desc(tx);
2380 struct dma_pl330_chan *pch = to_pchan(tx->chan);
2381 dma_cookie_t cookie;
2382 unsigned long flags;
2384 spin_lock_irqsave(&pch->lock, flags);
2386 /* Assign cookies to all nodes */
2387 while (!list_empty(&last->node)) {
2388 desc = list_entry(last->node.next, struct dma_pl330_desc, node);
2390 desc->txd.callback = last->txd.callback;
2391 desc->txd.callback_param = last->txd.callback_param;
2395 dma_cookie_assign(&desc->txd);
2397 list_move_tail(&desc->node, &pch->submitted_list);
2401 cookie = dma_cookie_assign(&last->txd);
2402 list_add_tail(&last->node, &pch->submitted_list);
2403 spin_unlock_irqrestore(&pch->lock, flags);
2408 static inline void _init_desc(struct dma_pl330_desc *desc)
2410 desc->rqcfg.swap = SWAP_NO;
2411 desc->rqcfg.scctl = CCTRL0;
2412 desc->rqcfg.dcctl = CCTRL0;
2413 desc->txd.tx_submit = pl330_tx_submit;
2415 INIT_LIST_HEAD(&desc->node);
2418 /* Returns the number of descriptors added to the DMAC pool */
2419 static int add_desc(struct pl330_dmac *pl330, gfp_t flg, int count)
2421 struct dma_pl330_desc *desc;
2422 unsigned long flags;
2425 desc = kcalloc(count, sizeof(*desc), flg);
2429 spin_lock_irqsave(&pl330->pool_lock, flags);
2431 for (i = 0; i < count; i++) {
2432 _init_desc(&desc[i]);
2433 list_add_tail(&desc[i].node, &pl330->desc_pool);
2436 spin_unlock_irqrestore(&pl330->pool_lock, flags);
2441 static struct dma_pl330_desc *pluck_desc(struct pl330_dmac *pl330)
2443 struct dma_pl330_desc *desc = NULL;
2444 unsigned long flags;
2446 spin_lock_irqsave(&pl330->pool_lock, flags);
2448 if (!list_empty(&pl330->desc_pool)) {
2449 desc = list_entry(pl330->desc_pool.next,
2450 struct dma_pl330_desc, node);
2452 list_del_init(&desc->node);
2454 desc->status = PREP;
2455 desc->txd.callback = NULL;
2458 spin_unlock_irqrestore(&pl330->pool_lock, flags);
2463 static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
2465 struct pl330_dmac *pl330 = pch->dmac;
2466 u8 *peri_id = pch->chan.private;
2467 struct dma_pl330_desc *desc;
2469 /* Pluck one desc from the pool of DMAC */
2470 desc = pluck_desc(pl330);
2472 /* If the DMAC pool is empty, alloc new */
2474 if (!add_desc(pl330, GFP_ATOMIC, 1))
2478 desc = pluck_desc(pl330);
2480 dev_err(pch->dmac->ddma.dev,
2481 "%s:%d ALERT!\n", __func__, __LINE__);
2486 /* Initialize the descriptor */
2488 desc->txd.cookie = 0;
2489 async_tx_ack(&desc->txd);
2491 desc->peri = peri_id ? pch->chan.chan_id : 0;
2492 desc->rqcfg.pcfg = &pch->dmac->pcfg;
2494 dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
2499 static inline void fill_px(struct pl330_xfer *px,
2500 dma_addr_t dst, dma_addr_t src, size_t len)
2507 static struct dma_pl330_desc *
2508 __pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
2509 dma_addr_t src, size_t len)
2511 struct dma_pl330_desc *desc = pl330_get_desc(pch);
2514 dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
2515 __func__, __LINE__);
2520 * Ideally we should lookout for reqs bigger than
2521 * those that can be programmed with 256 bytes of
2522 * MC buffer, but considering a req size is seldom
2523 * going to be word-unaligned and more than 200MB,
2525 * Also, should the limit is reached we'd rather
2526 * have the platform increase MC buffer size than
2527 * complicating this API driver.
2529 fill_px(&desc->px, dst, src, len);
2534 /* Call after fixing burst size */
2535 static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
2537 struct dma_pl330_chan *pch = desc->pchan;
2538 struct pl330_dmac *pl330 = pch->dmac;
2541 burst_len = pl330->pcfg.data_bus_width / 8;
2542 burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan;
2543 burst_len >>= desc->rqcfg.brst_size;
2545 /* src/dst_burst_len can't be more than 16 */
2549 while (burst_len > 1) {
2550 if (!(len % (burst_len << desc->rqcfg.brst_size)))
2558 static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
2559 struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
2560 size_t period_len, enum dma_transfer_direction direction,
2561 unsigned long flags)
2563 struct dma_pl330_desc *desc = NULL, *first = NULL;
2564 struct dma_pl330_chan *pch = to_pchan(chan);
2565 struct pl330_dmac *pl330 = pch->dmac;
2570 if (len % period_len != 0)
2573 if (!is_slave_direction(direction)) {
2574 dev_err(pch->dmac->ddma.dev, "%s:%d Invalid dma direction\n",
2575 __func__, __LINE__);
2579 for (i = 0; i < len / period_len; i++) {
2580 desc = pl330_get_desc(pch);
2582 unsigned long iflags;
2584 dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
2585 __func__, __LINE__);
2590 spin_lock_irqsave(&pl330->pool_lock, iflags);
2592 while (!list_empty(&first->node)) {
2593 desc = list_entry(first->node.next,
2594 struct dma_pl330_desc, node);
2595 list_move_tail(&desc->node, &pl330->desc_pool);
2598 list_move_tail(&first->node, &pl330->desc_pool);
2600 spin_unlock_irqrestore(&pl330->pool_lock, iflags);
2605 switch (direction) {
2606 case DMA_MEM_TO_DEV:
2607 desc->rqcfg.src_inc = 1;
2608 desc->rqcfg.dst_inc = 0;
2610 dst = pch->fifo_addr;
2612 case DMA_DEV_TO_MEM:
2613 desc->rqcfg.src_inc = 0;
2614 desc->rqcfg.dst_inc = 1;
2615 src = pch->fifo_addr;
2622 desc->rqtype = direction;
2623 desc->rqcfg.brst_size = pch->burst_sz;
2624 desc->rqcfg.brst_len = 1;
2625 desc->bytes_requested = period_len;
2626 fill_px(&desc->px, dst, src, period_len);
2631 list_add_tail(&desc->node, &first->node);
2633 dma_addr += period_len;
2640 desc->txd.flags = flags;
2645 static struct dma_async_tx_descriptor *
2646 pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
2647 dma_addr_t src, size_t len, unsigned long flags)
2649 struct dma_pl330_desc *desc;
2650 struct dma_pl330_chan *pch = to_pchan(chan);
2651 struct pl330_dmac *pl330;
2654 if (unlikely(!pch || !len))
2659 desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
2663 desc->rqcfg.src_inc = 1;
2664 desc->rqcfg.dst_inc = 1;
2665 desc->rqtype = DMA_MEM_TO_MEM;
2667 /* Select max possible burst size */
2668 burst = pl330->pcfg.data_bus_width / 8;
2671 * Make sure we use a burst size that aligns with all the memcpy
2672 * parameters because our DMA programming algorithm doesn't cope with
2673 * transfers which straddle an entry in the DMA device's MFIFO.
2675 while ((src | dst | len) & (burst - 1))
2678 desc->rqcfg.brst_size = 0;
2679 while (burst != (1 << desc->rqcfg.brst_size))
2680 desc->rqcfg.brst_size++;
2682 desc->rqcfg.brst_len = get_burst_len(desc, len);
2684 * If burst size is smaller than bus width then make sure we only
2685 * transfer one at a time to avoid a burst stradling an MFIFO entry.
2687 if (burst * 8 < pl330->pcfg.data_bus_width)
2688 desc->rqcfg.brst_len = 1;
2690 desc->bytes_requested = len;
2692 desc->txd.flags = flags;
2697 static void __pl330_giveback_desc(struct pl330_dmac *pl330,
2698 struct dma_pl330_desc *first)
2700 unsigned long flags;
2701 struct dma_pl330_desc *desc;
2706 spin_lock_irqsave(&pl330->pool_lock, flags);
2708 while (!list_empty(&first->node)) {
2709 desc = list_entry(first->node.next,
2710 struct dma_pl330_desc, node);
2711 list_move_tail(&desc->node, &pl330->desc_pool);
2714 list_move_tail(&first->node, &pl330->desc_pool);
2716 spin_unlock_irqrestore(&pl330->pool_lock, flags);
2719 static struct dma_async_tx_descriptor *
2720 pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2721 unsigned int sg_len, enum dma_transfer_direction direction,
2722 unsigned long flg, void *context)
2724 struct dma_pl330_desc *first, *desc = NULL;
2725 struct dma_pl330_chan *pch = to_pchan(chan);
2726 struct scatterlist *sg;
2730 if (unlikely(!pch || !sgl || !sg_len))
2733 addr = pch->fifo_addr;
2737 for_each_sg(sgl, sg, sg_len, i) {
2739 desc = pl330_get_desc(pch);
2741 struct pl330_dmac *pl330 = pch->dmac;
2743 dev_err(pch->dmac->ddma.dev,
2744 "%s:%d Unable to fetch desc\n",
2745 __func__, __LINE__);
2746 __pl330_giveback_desc(pl330, first);
2754 list_add_tail(&desc->node, &first->node);
2756 if (direction == DMA_MEM_TO_DEV) {
2757 desc->rqcfg.src_inc = 1;
2758 desc->rqcfg.dst_inc = 0;
2760 addr, sg_dma_address(sg), sg_dma_len(sg));
2762 desc->rqcfg.src_inc = 0;
2763 desc->rqcfg.dst_inc = 1;
2765 sg_dma_address(sg), addr, sg_dma_len(sg));
2768 desc->rqcfg.brst_size = pch->burst_sz;
2769 desc->rqcfg.brst_len = 1;
2770 desc->rqtype = direction;
2771 desc->bytes_requested = sg_dma_len(sg);
2774 /* Return the last desc in the chain */
2775 desc->txd.flags = flg;
2779 static irqreturn_t pl330_irq_handler(int irq, void *data)
2781 if (pl330_update(data))
2787 #define PL330_DMA_BUSWIDTHS \
2788 BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
2789 BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
2790 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
2791 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
2792 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
2795 * Runtime PM callbacks are provided by amba/bus.c driver.
2797 * It is assumed here that IRQ safe runtime PM is chosen in probe and amba
2798 * bus driver will only disable/enable the clock in runtime PM callbacks.
2800 static int __maybe_unused pl330_suspend(struct device *dev)
2802 struct amba_device *pcdev = to_amba_device(dev);
2804 pm_runtime_disable(dev);
2806 if (!pm_runtime_status_suspended(dev)) {
2807 /* amba did not disable the clock */
2808 amba_pclk_disable(pcdev);
2810 amba_pclk_unprepare(pcdev);
2815 static int __maybe_unused pl330_resume(struct device *dev)
2817 struct amba_device *pcdev = to_amba_device(dev);
2820 ret = amba_pclk_prepare(pcdev);
2824 if (!pm_runtime_status_suspended(dev))
2825 ret = amba_pclk_enable(pcdev);
2827 pm_runtime_enable(dev);
2832 static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume);
2835 pl330_probe(struct amba_device *adev, const struct amba_id *id)
2837 struct dma_pl330_platdata *pdat;
2838 struct pl330_config *pcfg;
2839 struct pl330_dmac *pl330;
2840 struct dma_pl330_chan *pch, *_p;
2841 struct dma_device *pd;
2842 struct resource *res;
2845 struct device_node *np = adev->dev.of_node;
2847 pdat = dev_get_platdata(&adev->dev);
2849 ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
2853 /* Allocate a new DMAC and its Channels */
2854 pl330 = devm_kzalloc(&adev->dev, sizeof(*pl330), GFP_KERNEL);
2859 pd->dev = &adev->dev;
2861 pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
2864 for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
2865 if (of_property_read_bool(np, of_quirks[i].quirk))
2866 pl330->quirks |= of_quirks[i].id;
2869 pl330->base = devm_ioremap_resource(&adev->dev, res);
2870 if (IS_ERR(pl330->base))
2871 return PTR_ERR(pl330->base);
2873 amba_set_drvdata(adev, pl330);
2875 for (i = 0; i < AMBA_NR_IRQS; i++) {
2878 ret = devm_request_irq(&adev->dev, irq,
2879 pl330_irq_handler, 0,
2880 dev_name(&adev->dev), pl330);
2888 pcfg = &pl330->pcfg;
2890 pcfg->periph_id = adev->periphid;
2891 ret = pl330_add(pl330);
2895 INIT_LIST_HEAD(&pl330->desc_pool);
2896 spin_lock_init(&pl330->pool_lock);
2898 /* Create a descriptor pool of default size */
2899 if (!add_desc(pl330, GFP_KERNEL, NR_DEFAULT_DESC))
2900 dev_warn(&adev->dev, "unable to allocate desc\n");
2902 INIT_LIST_HEAD(&pd->channels);
2904 /* Initialize channel parameters */
2906 num_chan = max_t(int, pdat->nr_valid_peri, pcfg->num_chan);
2908 num_chan = max_t(int, pcfg->num_peri, pcfg->num_chan);
2910 pl330->num_peripherals = num_chan;
2912 pl330->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
2913 if (!pl330->peripherals) {
2918 for (i = 0; i < num_chan; i++) {
2919 pch = &pl330->peripherals[i];
2920 if (!adev->dev.of_node)
2921 pch->chan.private = pdat ? &pdat->peri_id[i] : NULL;
2923 pch->chan.private = adev->dev.of_node;
2925 INIT_LIST_HEAD(&pch->submitted_list);
2926 INIT_LIST_HEAD(&pch->work_list);
2927 INIT_LIST_HEAD(&pch->completed_list);
2928 spin_lock_init(&pch->lock);
2930 pch->chan.device = pd;
2933 /* Add the channel to the DMAC list */
2934 list_add_tail(&pch->chan.device_node, &pd->channels);
2938 pd->cap_mask = pdat->cap_mask;
2940 dma_cap_set(DMA_MEMCPY, pd->cap_mask);
2941 if (pcfg->num_peri) {
2942 dma_cap_set(DMA_SLAVE, pd->cap_mask);
2943 dma_cap_set(DMA_CYCLIC, pd->cap_mask);
2944 dma_cap_set(DMA_PRIVATE, pd->cap_mask);
2948 pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
2949 pd->device_free_chan_resources = pl330_free_chan_resources;
2950 pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
2951 pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
2952 pd->device_tx_status = pl330_tx_status;
2953 pd->device_prep_slave_sg = pl330_prep_slave_sg;
2954 pd->device_config = pl330_config;
2955 pd->device_pause = pl330_pause;
2956 pd->device_terminate_all = pl330_terminate_all;
2957 pd->device_issue_pending = pl330_issue_pending;
2958 pd->src_addr_widths = PL330_DMA_BUSWIDTHS;
2959 pd->dst_addr_widths = PL330_DMA_BUSWIDTHS;
2960 pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
2961 pd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
2962 pd->max_burst = ((pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) ?
2963 1 : PL330_MAX_BURST);
2965 ret = dma_async_device_register(pd);
2967 dev_err(&adev->dev, "unable to register DMAC\n");
2971 if (adev->dev.of_node) {
2972 ret = of_dma_controller_register(adev->dev.of_node,
2973 of_dma_pl330_xlate, pl330);
2976 "unable to register DMA to the generic DT DMA helpers\n");
2980 adev->dev.dma_parms = &pl330->dma_parms;
2983 * This is the limit for transfers with a buswidth of 1, larger
2984 * buswidths will have larger limits.
2986 ret = dma_set_max_seg_size(&adev->dev, 1900800);
2988 dev_err(&adev->dev, "unable to set the seg size\n");
2991 dev_info(&adev->dev,
2992 "Loaded driver for PL330 DMAC-%x\n", adev->periphid);
2993 dev_info(&adev->dev,
2994 "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
2995 pcfg->data_buf_dep, pcfg->data_bus_width / 8, pcfg->num_chan,
2996 pcfg->num_peri, pcfg->num_events);
2998 pm_runtime_irq_safe(&adev->dev);
2999 pm_runtime_use_autosuspend(&adev->dev);
3000 pm_runtime_set_autosuspend_delay(&adev->dev, PL330_AUTOSUSPEND_DELAY);
3001 pm_runtime_mark_last_busy(&adev->dev);
3002 pm_runtime_put_autosuspend(&adev->dev);
3007 list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
3010 /* Remove the channel */
3011 list_del(&pch->chan.device_node);
3013 /* Flush the channel */
3015 pl330_terminate_all(&pch->chan);
3016 pl330_free_chan_resources(&pch->chan);
3025 static int pl330_remove(struct amba_device *adev)
3027 struct pl330_dmac *pl330 = amba_get_drvdata(adev);
3028 struct dma_pl330_chan *pch, *_p;
3031 pm_runtime_get_noresume(pl330->ddma.dev);
3033 if (adev->dev.of_node)
3034 of_dma_controller_free(adev->dev.of_node);
3036 for (i = 0; i < AMBA_NR_IRQS; i++) {
3038 devm_free_irq(&adev->dev, irq, pl330);
3041 dma_async_device_unregister(&pl330->ddma);
3044 list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
3047 /* Remove the channel */
3048 list_del(&pch->chan.device_node);
3050 /* Flush the channel */
3052 pl330_terminate_all(&pch->chan);
3053 pl330_free_chan_resources(&pch->chan);
3062 static struct amba_id pl330_ids[] = {
3070 MODULE_DEVICE_TABLE(amba, pl330_ids);
3072 static struct amba_driver pl330_driver = {
3074 .owner = THIS_MODULE,
3075 .name = "dma-pl330",
3078 .id_table = pl330_ids,
3079 .probe = pl330_probe,
3080 .remove = pl330_remove,
3083 module_amba_driver(pl330_driver);
3085 MODULE_AUTHOR("Jaswinder Singh <jassisinghbrar@gmail.com>");
3086 MODULE_DESCRIPTION("API Driver for PL330 DMAC");
3087 MODULE_LICENSE("GPL");