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>
31 #include "dmaengine.h"
32 #define PL330_MAX_CHAN 8
33 #define PL330_MAX_IRQS 32
34 #define PL330_MAX_PERI 32
36 enum pl330_srccachectrl {
37 SCCTRL0, /* Noncacheable and nonbufferable */
38 SCCTRL1, /* Bufferable only */
39 SCCTRL2, /* Cacheable, but do not allocate */
40 SCCTRL3, /* Cacheable and bufferable, but do not allocate */
43 SCCTRL6, /* Cacheable write-through, allocate on reads only */
44 SCCTRL7, /* Cacheable write-back, allocate on reads only */
47 enum pl330_dstcachectrl {
48 DCCTRL0, /* Noncacheable and nonbufferable */
49 DCCTRL1, /* Bufferable only */
50 DCCTRL2, /* Cacheable, but do not allocate */
51 DCCTRL3, /* Cacheable and bufferable, but do not allocate */
52 DINVALID1, /* AWCACHE = 0x1000 */
54 DCCTRL6, /* Cacheable write-through, allocate on writes only */
55 DCCTRL7, /* Cacheable write-back, allocate on writes only */
73 /* Register and Bit field Definitions */
75 #define DS_ST_STOP 0x0
76 #define DS_ST_EXEC 0x1
77 #define DS_ST_CMISS 0x2
78 #define DS_ST_UPDTPC 0x3
80 #define DS_ST_ATBRR 0x5
81 #define DS_ST_QBUSY 0x6
83 #define DS_ST_KILL 0x8
84 #define DS_ST_CMPLT 0x9
85 #define DS_ST_FLTCMP 0xe
86 #define DS_ST_FAULT 0xf
91 #define INTSTATUS 0x28
98 #define FTC(n) (_FTC + (n)*0x4)
101 #define CS(n) (_CS + (n)*0x8)
102 #define CS_CNS (1 << 21)
105 #define CPC(n) (_CPC + (n)*0x8)
108 #define SA(n) (_SA + (n)*0x20)
111 #define DA(n) (_DA + (n)*0x20)
114 #define CC(n) (_CC + (n)*0x20)
116 #define CC_SRCINC (1 << 0)
117 #define CC_DSTINC (1 << 14)
118 #define CC_SRCPRI (1 << 8)
119 #define CC_DSTPRI (1 << 22)
120 #define CC_SRCNS (1 << 9)
121 #define CC_DSTNS (1 << 23)
122 #define CC_SRCIA (1 << 10)
123 #define CC_DSTIA (1 << 24)
124 #define CC_SRCBRSTLEN_SHFT 4
125 #define CC_DSTBRSTLEN_SHFT 18
126 #define CC_SRCBRSTSIZE_SHFT 1
127 #define CC_DSTBRSTSIZE_SHFT 15
128 #define CC_SRCCCTRL_SHFT 11
129 #define CC_SRCCCTRL_MASK 0x7
130 #define CC_DSTCCTRL_SHFT 25
131 #define CC_DRCCCTRL_MASK 0x7
132 #define CC_SWAP_SHFT 28
135 #define LC0(n) (_LC0 + (n)*0x20)
138 #define LC1(n) (_LC1 + (n)*0x20)
140 #define DBGSTATUS 0xd00
141 #define DBG_BUSY (1 << 0)
144 #define DBGINST0 0xd08
145 #define DBGINST1 0xd0c
154 #define PERIPH_ID 0xfe0
155 #define PERIPH_REV_SHIFT 20
156 #define PERIPH_REV_MASK 0xf
157 #define PERIPH_REV_R0P0 0
158 #define PERIPH_REV_R1P0 1
159 #define PERIPH_REV_R1P1 2
161 #define CR0_PERIPH_REQ_SET (1 << 0)
162 #define CR0_BOOT_EN_SET (1 << 1)
163 #define CR0_BOOT_MAN_NS (1 << 2)
164 #define CR0_NUM_CHANS_SHIFT 4
165 #define CR0_NUM_CHANS_MASK 0x7
166 #define CR0_NUM_PERIPH_SHIFT 12
167 #define CR0_NUM_PERIPH_MASK 0x1f
168 #define CR0_NUM_EVENTS_SHIFT 17
169 #define CR0_NUM_EVENTS_MASK 0x1f
171 #define CR1_ICACHE_LEN_SHIFT 0
172 #define CR1_ICACHE_LEN_MASK 0x7
173 #define CR1_NUM_ICACHELINES_SHIFT 4
174 #define CR1_NUM_ICACHELINES_MASK 0xf
176 #define CRD_DATA_WIDTH_SHIFT 0
177 #define CRD_DATA_WIDTH_MASK 0x7
178 #define CRD_WR_CAP_SHIFT 4
179 #define CRD_WR_CAP_MASK 0x7
180 #define CRD_WR_Q_DEP_SHIFT 8
181 #define CRD_WR_Q_DEP_MASK 0xf
182 #define CRD_RD_CAP_SHIFT 12
183 #define CRD_RD_CAP_MASK 0x7
184 #define CRD_RD_Q_DEP_SHIFT 16
185 #define CRD_RD_Q_DEP_MASK 0xf
186 #define CRD_DATA_BUFF_SHIFT 20
187 #define CRD_DATA_BUFF_MASK 0x3ff
190 #define DESIGNER 0x41
192 #define INTEG_CFG 0x0
193 #define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12))
195 #define PL330_STATE_STOPPED (1 << 0)
196 #define PL330_STATE_EXECUTING (1 << 1)
197 #define PL330_STATE_WFE (1 << 2)
198 #define PL330_STATE_FAULTING (1 << 3)
199 #define PL330_STATE_COMPLETING (1 << 4)
200 #define PL330_STATE_WFP (1 << 5)
201 #define PL330_STATE_KILLING (1 << 6)
202 #define PL330_STATE_FAULT_COMPLETING (1 << 7)
203 #define PL330_STATE_CACHEMISS (1 << 8)
204 #define PL330_STATE_UPDTPC (1 << 9)
205 #define PL330_STATE_ATBARRIER (1 << 10)
206 #define PL330_STATE_QUEUEBUSY (1 << 11)
207 #define PL330_STATE_INVALID (1 << 15)
209 #define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
210 | PL330_STATE_WFE | PL330_STATE_FAULTING)
212 #define CMD_DMAADDH 0x54
213 #define CMD_DMAEND 0x00
214 #define CMD_DMAFLUSHP 0x35
215 #define CMD_DMAGO 0xa0
216 #define CMD_DMALD 0x04
217 #define CMD_DMALDP 0x25
218 #define CMD_DMALP 0x20
219 #define CMD_DMALPEND 0x28
220 #define CMD_DMAKILL 0x01
221 #define CMD_DMAMOV 0xbc
222 #define CMD_DMANOP 0x18
223 #define CMD_DMARMB 0x12
224 #define CMD_DMASEV 0x34
225 #define CMD_DMAST 0x08
226 #define CMD_DMASTP 0x29
227 #define CMD_DMASTZ 0x0c
228 #define CMD_DMAWFE 0x36
229 #define CMD_DMAWFP 0x30
230 #define CMD_DMAWMB 0x13
234 #define SZ_DMAFLUSHP 2
238 #define SZ_DMALPEND 2
252 #define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
253 #define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
255 #define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
256 #define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
259 * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
260 * at 1byte/burst for P<->M and M<->M respectively.
261 * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
262 * should be enough for P<->M and M<->M respectively.
264 #define MCODE_BUFF_PER_REQ 256
266 /* If the _pl330_req is available to the client */
267 #define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND)
269 /* Use this _only_ to wait on transient states */
270 #define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
272 #ifdef PL330_DEBUG_MCGEN
273 static unsigned cmd_line;
274 #define PL330_DBGCMD_DUMP(off, x...) do { \
275 printk("%x:", cmd_line); \
279 #define PL330_DBGMC_START(addr) (cmd_line = addr)
281 #define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
282 #define PL330_DBGMC_START(addr) do {} while (0)
285 /* The number of default descriptors */
287 #define NR_DEFAULT_DESC 16
289 /* Populated by the PL330 core driver for DMA API driver's info */
290 struct pl330_config {
292 #define DMAC_MODE_NS (1 << 0)
294 unsigned int data_bus_width:10; /* In number of bits */
295 unsigned int data_buf_dep:10;
296 unsigned int num_chan:4;
297 unsigned int num_peri:6;
299 unsigned int num_events:6;
303 /* Handle to the DMAC provided to the PL330 core */
307 /* Size of MicroCode buffers for each channel. */
309 /* ioremap'ed address of PL330 registers. */
311 /* Client can freely use it. */
313 /* PL330 core data, Client must not touch it. */
315 /* Populated by the PL330 core driver during pl330_add */
316 struct pl330_config pcfg;
318 * If the DMAC has some reset mechanism, then the
319 * client may want to provide pointer to the method.
321 void (*dmac_reset)(struct pl330_info *pi);
325 * Request Configuration.
326 * The PL330 core does not modify this and uses the last
327 * working configuration if the request doesn't provide any.
329 * The Client may want to provide this info only for the
330 * first request and a request with new settings.
332 struct pl330_reqcfg {
333 /* Address Incrementing */
338 * For now, the SRC & DST protection levels
339 * and burst size/length are assumed same.
345 unsigned brst_size:3; /* in power of 2 */
347 enum pl330_dstcachectrl dcctl;
348 enum pl330_srccachectrl scctl;
349 enum pl330_byteswap swap;
350 struct pl330_config *pcfg;
354 * One cycle of DMAC operation.
355 * There may be more than one xfer in a request.
363 * Pointer to next xfer in the list.
364 * The last xfer in the req must point to NULL.
366 struct pl330_xfer *next;
369 /* The xfer callbacks are made with one of these arguments. */
371 /* The all xfers in the request were success. */
373 /* If req aborted due to global error. */
375 /* If req failed due to problem with Channel. */
379 /* A request defining Scatter-Gather List ending with NULL xfer. */
381 enum pl330_reqtype rqtype;
382 /* Index of peripheral for the xfer. */
384 /* Unique token for this xfer, set by the client. */
386 /* Callback to be called after xfer. */
387 void (*xfer_cb)(void *token, enum pl330_op_err err);
388 /* If NULL, req will be done at last set parameters. */
389 struct pl330_reqcfg *cfg;
390 /* Pointer to first xfer in the request. */
391 struct pl330_xfer *x;
392 /* Hook to attach to DMAC's list of reqs with due callback */
393 struct list_head rqd;
397 * To know the status of the channel and DMAC, the client
398 * provides a pointer to this structure. The PL330 core
399 * fills it with current information.
401 struct pl330_chanstatus {
403 * If the DMAC engine halted due to some error,
404 * the client should remove-add DMAC.
408 * If channel is halted due to some error,
409 * the client should ABORT/FLUSH and START the channel.
412 /* Location of last load */
414 /* Location of last store */
417 * Pointer to the currently active req, NULL if channel is
418 * inactive, even though the requests may be present.
420 struct pl330_req *top_req;
421 /* Pointer to req waiting second in the queue if any. */
422 struct pl330_req *wait_req;
426 /* Start the channel */
428 /* Abort the active xfer */
430 /* Stop xfer and flush queue */
437 struct pl330_xfer *x;
460 /* Number of bytes taken to setup MC for the req */
465 /* ToBeDone for tasklet */
473 struct pl330_thread {
476 /* If the channel is not yet acquired by any client */
479 struct pl330_dmac *dmac;
480 /* Only two at a time */
481 struct _pl330_req req[2];
482 /* Index of the last enqueued request */
484 /* Index of the last submitted request or -1 if the DMA is stopped */
488 enum pl330_dmac_state {
497 /* Holds list of reqs with due callbacks */
498 struct list_head req_done;
499 /* Pointer to platform specific stuff */
500 struct pl330_info *pinfo;
501 /* Maximum possible events/irqs */
503 /* BUS address of MicroCode buffer */
504 dma_addr_t mcode_bus;
505 /* CPU address of MicroCode buffer */
507 /* List of all Channel threads */
508 struct pl330_thread *channels;
509 /* Pointer to the MANAGER thread */
510 struct pl330_thread *manager;
511 /* To handle bad news in interrupt */
512 struct tasklet_struct tasks;
513 struct _pl330_tbd dmac_tbd;
514 /* State of DMAC operation */
515 enum pl330_dmac_state state;
519 /* In the DMAC pool */
522 * Allocated to some channel during prep_xxx
523 * Also may be sitting on the work_list.
527 * Sitting on the work_list and already submitted
528 * to the PL330 core. Not more than two descriptors
529 * of a channel can be BUSY at any time.
533 * Sitting on the channel work_list but xfer done
539 struct dma_pl330_chan {
540 /* Schedule desc completion */
541 struct tasklet_struct task;
543 /* DMA-Engine Channel */
544 struct dma_chan chan;
546 /* List of to be xfered descriptors */
547 struct list_head work_list;
549 /* Pointer to the DMAC that manages this channel,
550 * NULL if the channel is available to be acquired.
551 * As the parent, this DMAC also provides descriptors
554 struct dma_pl330_dmac *dmac;
556 /* To protect channel manipulation */
559 /* Token of a hardware channel thread of PL330 DMAC
560 * NULL if the channel is available to be acquired.
564 /* For D-to-M and M-to-D channels */
565 int burst_sz; /* the peripheral fifo width */
566 int burst_len; /* the number of burst */
567 dma_addr_t fifo_addr;
569 /* for cyclic capability */
573 struct dma_pl330_dmac {
574 struct pl330_info pif;
576 /* DMA-Engine Device */
577 struct dma_device ddma;
579 /* Pool of descriptors available for the DMAC's channels */
580 struct list_head desc_pool;
581 /* To protect desc_pool manipulation */
582 spinlock_t pool_lock;
584 /* Peripheral channels connected to this DMAC */
585 struct dma_pl330_chan *peripherals; /* keep at end */
588 struct dma_pl330_desc {
589 /* To attach to a queue as child */
590 struct list_head node;
592 /* Descriptor for the DMA Engine API */
593 struct dma_async_tx_descriptor txd;
595 /* Xfer for PL330 core */
596 struct pl330_xfer px;
598 struct pl330_reqcfg rqcfg;
599 struct pl330_req req;
601 enum desc_status status;
603 /* The channel which currently holds this desc */
604 struct dma_pl330_chan *pchan;
607 struct dma_pl330_filter_args {
608 struct dma_pl330_dmac *pdmac;
609 unsigned int chan_id;
612 static inline void _callback(struct pl330_req *r, enum pl330_op_err err)
615 r->xfer_cb(r->token, err);
618 static inline bool _queue_empty(struct pl330_thread *thrd)
620 return (IS_FREE(&thrd->req[0]) && IS_FREE(&thrd->req[1]))
624 static inline bool _queue_full(struct pl330_thread *thrd)
626 return (IS_FREE(&thrd->req[0]) || IS_FREE(&thrd->req[1]))
630 static inline bool is_manager(struct pl330_thread *thrd)
632 struct pl330_dmac *pl330 = thrd->dmac;
634 /* MANAGER is indexed at the end */
635 if (thrd->id == pl330->pinfo->pcfg.num_chan)
641 /* If manager of the thread is in Non-Secure mode */
642 static inline bool _manager_ns(struct pl330_thread *thrd)
644 struct pl330_dmac *pl330 = thrd->dmac;
646 return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false;
649 static inline u32 get_revision(u32 periph_id)
651 return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK;
654 static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[],
655 enum pl330_dst da, u16 val)
660 buf[0] = CMD_DMAADDH;
662 *((u16 *)&buf[1]) = val;
664 PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n",
665 da == 1 ? "DA" : "SA", val);
670 static inline u32 _emit_END(unsigned dry_run, u8 buf[])
677 PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
682 static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
687 buf[0] = CMD_DMAFLUSHP;
693 PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3);
698 static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond)
706 buf[0] |= (0 << 1) | (1 << 0);
707 else if (cond == BURST)
708 buf[0] |= (1 << 1) | (1 << 0);
710 PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n",
711 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
716 static inline u32 _emit_LDP(unsigned dry_run, u8 buf[],
717 enum pl330_cond cond, u8 peri)
731 PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n",
732 cond == SINGLE ? 'S' : 'B', peri >> 3);
737 static inline u32 _emit_LP(unsigned dry_run, u8 buf[],
738 unsigned loop, u8 cnt)
748 cnt--; /* DMAC increments by 1 internally */
751 PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt);
757 enum pl330_cond cond;
763 static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[],
764 const struct _arg_LPEND *arg)
766 enum pl330_cond cond = arg->cond;
767 bool forever = arg->forever;
768 unsigned loop = arg->loop;
769 u8 bjump = arg->bjump;
774 buf[0] = CMD_DMALPEND;
783 buf[0] |= (0 << 1) | (1 << 0);
784 else if (cond == BURST)
785 buf[0] |= (1 << 1) | (1 << 0);
789 PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n",
790 forever ? "FE" : "END",
791 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'),
798 static inline u32 _emit_KILL(unsigned dry_run, u8 buf[])
803 buf[0] = CMD_DMAKILL;
808 static inline u32 _emit_MOV(unsigned dry_run, u8 buf[],
809 enum dmamov_dst dst, u32 val)
816 *((u32 *)&buf[2]) = val;
818 PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n",
819 dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val);
824 static inline u32 _emit_NOP(unsigned dry_run, u8 buf[])
831 PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n");
836 static inline u32 _emit_RMB(unsigned dry_run, u8 buf[])
843 PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n");
848 static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev)
859 PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3);
864 static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond)
872 buf[0] |= (0 << 1) | (1 << 0);
873 else if (cond == BURST)
874 buf[0] |= (1 << 1) | (1 << 0);
876 PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n",
877 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
882 static inline u32 _emit_STP(unsigned dry_run, u8 buf[],
883 enum pl330_cond cond, u8 peri)
897 PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n",
898 cond == SINGLE ? 'S' : 'B', peri >> 3);
903 static inline u32 _emit_STZ(unsigned dry_run, u8 buf[])
910 PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n");
915 static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev,
930 PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n",
931 ev >> 3, invalidate ? ", I" : "");
936 static inline u32 _emit_WFP(unsigned dry_run, u8 buf[],
937 enum pl330_cond cond, u8 peri)
945 buf[0] |= (0 << 1) | (0 << 0);
946 else if (cond == BURST)
947 buf[0] |= (1 << 1) | (0 << 0);
949 buf[0] |= (0 << 1) | (1 << 0);
955 PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n",
956 cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3);
961 static inline u32 _emit_WMB(unsigned dry_run, u8 buf[])
968 PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n");
979 static inline u32 _emit_GO(unsigned dry_run, u8 buf[],
980 const struct _arg_GO *arg)
983 u32 addr = arg->addr;
984 unsigned ns = arg->ns;
994 *((u32 *)&buf[2]) = addr;
999 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
1001 /* Returns Time-Out */
1002 static bool _until_dmac_idle(struct pl330_thread *thrd)
1004 void __iomem *regs = thrd->dmac->pinfo->base;
1005 unsigned long loops = msecs_to_loops(5);
1008 /* Until Manager is Idle */
1009 if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
1021 static inline void _execute_DBGINSN(struct pl330_thread *thrd,
1022 u8 insn[], bool as_manager)
1024 void __iomem *regs = thrd->dmac->pinfo->base;
1027 val = (insn[0] << 16) | (insn[1] << 24);
1030 val |= (thrd->id << 8); /* Channel Number */
1032 writel(val, regs + DBGINST0);
1034 val = *((u32 *)&insn[2]);
1035 writel(val, regs + DBGINST1);
1037 /* If timed out due to halted state-machine */
1038 if (_until_dmac_idle(thrd)) {
1039 dev_err(thrd->dmac->pinfo->dev, "DMAC halted!\n");
1044 writel(0, regs + DBGCMD);
1048 * Mark a _pl330_req as free.
1049 * We do it by writing DMAEND as the first instruction
1050 * because no valid request is going to have DMAEND as
1051 * its first instruction to execute.
1053 static void mark_free(struct pl330_thread *thrd, int idx)
1055 struct _pl330_req *req = &thrd->req[idx];
1057 _emit_END(0, req->mc_cpu);
1060 thrd->req_running = -1;
1063 static inline u32 _state(struct pl330_thread *thrd)
1065 void __iomem *regs = thrd->dmac->pinfo->base;
1068 if (is_manager(thrd))
1069 val = readl(regs + DS) & 0xf;
1071 val = readl(regs + CS(thrd->id)) & 0xf;
1075 return PL330_STATE_STOPPED;
1077 return PL330_STATE_EXECUTING;
1079 return PL330_STATE_CACHEMISS;
1081 return PL330_STATE_UPDTPC;
1083 return PL330_STATE_WFE;
1085 return PL330_STATE_FAULTING;
1087 if (is_manager(thrd))
1088 return PL330_STATE_INVALID;
1090 return PL330_STATE_ATBARRIER;
1092 if (is_manager(thrd))
1093 return PL330_STATE_INVALID;
1095 return PL330_STATE_QUEUEBUSY;
1097 if (is_manager(thrd))
1098 return PL330_STATE_INVALID;
1100 return PL330_STATE_WFP;
1102 if (is_manager(thrd))
1103 return PL330_STATE_INVALID;
1105 return PL330_STATE_KILLING;
1107 if (is_manager(thrd))
1108 return PL330_STATE_INVALID;
1110 return PL330_STATE_COMPLETING;
1112 if (is_manager(thrd))
1113 return PL330_STATE_INVALID;
1115 return PL330_STATE_FAULT_COMPLETING;
1117 return PL330_STATE_INVALID;
1121 static void _stop(struct pl330_thread *thrd)
1123 void __iomem *regs = thrd->dmac->pinfo->base;
1124 u8 insn[6] = {0, 0, 0, 0, 0, 0};
1126 if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
1127 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
1129 /* Return if nothing needs to be done */
1130 if (_state(thrd) == PL330_STATE_COMPLETING
1131 || _state(thrd) == PL330_STATE_KILLING
1132 || _state(thrd) == PL330_STATE_STOPPED)
1135 _emit_KILL(0, insn);
1137 /* Stop generating interrupts for SEV */
1138 writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN);
1140 _execute_DBGINSN(thrd, insn, is_manager(thrd));
1143 /* Start doing req 'idx' of thread 'thrd' */
1144 static bool _trigger(struct pl330_thread *thrd)
1146 void __iomem *regs = thrd->dmac->pinfo->base;
1147 struct _pl330_req *req;
1148 struct pl330_req *r;
1151 u8 insn[6] = {0, 0, 0, 0, 0, 0};
1154 /* Return if already ACTIVE */
1155 if (_state(thrd) != PL330_STATE_STOPPED)
1158 idx = 1 - thrd->lstenq;
1159 if (!IS_FREE(&thrd->req[idx]))
1160 req = &thrd->req[idx];
1163 if (!IS_FREE(&thrd->req[idx]))
1164 req = &thrd->req[idx];
1169 /* Return if no request */
1170 if (!req || !req->r)
1176 ns = r->cfg->nonsecure ? 1 : 0;
1177 else if (readl(regs + CS(thrd->id)) & CS_CNS)
1182 /* See 'Abort Sources' point-4 at Page 2-25 */
1183 if (_manager_ns(thrd) && !ns)
1184 dev_info(thrd->dmac->pinfo->dev, "%s:%d Recipe for ABORT!\n",
1185 __func__, __LINE__);
1188 go.addr = req->mc_bus;
1190 _emit_GO(0, insn, &go);
1192 /* Set to generate interrupts for SEV */
1193 writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
1195 /* Only manager can execute GO */
1196 _execute_DBGINSN(thrd, insn, true);
1198 thrd->req_running = idx;
1203 static bool _start(struct pl330_thread *thrd)
1205 switch (_state(thrd)) {
1206 case PL330_STATE_FAULT_COMPLETING:
1207 UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
1209 if (_state(thrd) == PL330_STATE_KILLING)
1210 UNTIL(thrd, PL330_STATE_STOPPED)
1212 case PL330_STATE_FAULTING:
1215 case PL330_STATE_KILLING:
1216 case PL330_STATE_COMPLETING:
1217 UNTIL(thrd, PL330_STATE_STOPPED)
1219 case PL330_STATE_STOPPED:
1220 return _trigger(thrd);
1222 case PL330_STATE_WFP:
1223 case PL330_STATE_QUEUEBUSY:
1224 case PL330_STATE_ATBARRIER:
1225 case PL330_STATE_UPDTPC:
1226 case PL330_STATE_CACHEMISS:
1227 case PL330_STATE_EXECUTING:
1230 case PL330_STATE_WFE: /* For RESUME, nothing yet */
1236 static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
1237 const struct _xfer_spec *pxs, int cyc)
1240 struct pl330_config *pcfg = pxs->r->cfg->pcfg;
1242 /* check lock-up free version */
1243 if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) {
1245 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1246 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1250 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1251 off += _emit_RMB(dry_run, &buf[off]);
1252 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1253 off += _emit_WMB(dry_run, &buf[off]);
1260 static inline int _ldst_devtomem(unsigned dry_run, u8 buf[],
1261 const struct _xfer_spec *pxs, int cyc)
1266 off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
1267 off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->r->peri);
1268 off += _emit_ST(dry_run, &buf[off], ALWAYS);
1269 off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
1275 static inline int _ldst_memtodev(unsigned dry_run, u8 buf[],
1276 const struct _xfer_spec *pxs, int cyc)
1281 off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
1282 off += _emit_LD(dry_run, &buf[off], ALWAYS);
1283 off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->r->peri);
1284 off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
1290 static int _bursts(unsigned dry_run, u8 buf[],
1291 const struct _xfer_spec *pxs, int cyc)
1295 switch (pxs->r->rqtype) {
1297 off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc);
1300 off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc);
1303 off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
1306 off += 0x40000000; /* Scare off the Client */
1313 /* Returns bytes consumed and updates bursts */
1314 static inline int _loop(unsigned dry_run, u8 buf[],
1315 unsigned long *bursts, const struct _xfer_spec *pxs)
1317 int cyc, cycmax, szlp, szlpend, szbrst, off;
1318 unsigned lcnt0, lcnt1, ljmp0, ljmp1;
1319 struct _arg_LPEND lpend;
1321 /* Max iterations possible in DMALP is 256 */
1322 if (*bursts >= 256*256) {
1325 cyc = *bursts / lcnt1 / lcnt0;
1326 } else if (*bursts > 256) {
1328 lcnt0 = *bursts / lcnt1;
1336 szlp = _emit_LP(1, buf, 0, 0);
1337 szbrst = _bursts(1, buf, pxs, 1);
1339 lpend.cond = ALWAYS;
1340 lpend.forever = false;
1343 szlpend = _emit_LPEND(1, buf, &lpend);
1351 * Max bursts that we can unroll due to limit on the
1352 * size of backward jump that can be encoded in DMALPEND
1353 * which is 8-bits and hence 255
1355 cycmax = (255 - (szlp + szlpend)) / szbrst;
1357 cyc = (cycmax < cyc) ? cycmax : cyc;
1362 off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
1366 off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
1369 off += _bursts(dry_run, &buf[off], pxs, cyc);
1371 lpend.cond = ALWAYS;
1372 lpend.forever = false;
1374 lpend.bjump = off - ljmp1;
1375 off += _emit_LPEND(dry_run, &buf[off], &lpend);
1378 lpend.cond = ALWAYS;
1379 lpend.forever = false;
1381 lpend.bjump = off - ljmp0;
1382 off += _emit_LPEND(dry_run, &buf[off], &lpend);
1385 *bursts = lcnt1 * cyc;
1392 static inline int _setup_loops(unsigned dry_run, u8 buf[],
1393 const struct _xfer_spec *pxs)
1395 struct pl330_xfer *x = pxs->x;
1397 unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
1402 off += _loop(dry_run, &buf[off], &c, pxs);
1409 static inline int _setup_xfer(unsigned dry_run, u8 buf[],
1410 const struct _xfer_spec *pxs)
1412 struct pl330_xfer *x = pxs->x;
1415 /* DMAMOV SAR, x->src_addr */
1416 off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
1417 /* DMAMOV DAR, x->dst_addr */
1418 off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
1421 off += _setup_loops(dry_run, &buf[off], pxs);
1427 * A req is a sequence of one or more xfer units.
1428 * Returns the number of bytes taken to setup the MC for the req.
1430 static int _setup_req(unsigned dry_run, struct pl330_thread *thrd,
1431 unsigned index, struct _xfer_spec *pxs)
1433 struct _pl330_req *req = &thrd->req[index];
1434 struct pl330_xfer *x;
1435 u8 *buf = req->mc_cpu;
1438 PL330_DBGMC_START(req->mc_bus);
1440 /* DMAMOV CCR, ccr */
1441 off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
1445 /* Error if xfer length is not aligned at burst size */
1446 if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
1450 off += _setup_xfer(dry_run, &buf[off], pxs);
1455 /* DMASEV peripheral/event */
1456 off += _emit_SEV(dry_run, &buf[off], thrd->ev);
1458 off += _emit_END(dry_run, &buf[off]);
1463 static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
1473 /* We set same protection levels for Src and DST for now */
1474 if (rqc->privileged)
1475 ccr |= CC_SRCPRI | CC_DSTPRI;
1477 ccr |= CC_SRCNS | CC_DSTNS;
1478 if (rqc->insnaccess)
1479 ccr |= CC_SRCIA | CC_DSTIA;
1481 ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
1482 ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
1484 ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
1485 ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
1487 ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
1488 ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
1490 ccr |= (rqc->swap << CC_SWAP_SHFT);
1495 static inline bool _is_valid(u32 ccr)
1497 enum pl330_dstcachectrl dcctl;
1498 enum pl330_srccachectrl scctl;
1500 dcctl = (ccr >> CC_DSTCCTRL_SHFT) & CC_DRCCCTRL_MASK;
1501 scctl = (ccr >> CC_SRCCCTRL_SHFT) & CC_SRCCCTRL_MASK;
1503 if (dcctl == DINVALID1 || dcctl == DINVALID2
1504 || scctl == SINVALID1 || scctl == SINVALID2)
1511 * Submit a list of xfers after which the client wants notification.
1512 * Client is not notified after each xfer unit, just once after all
1513 * xfer units are done or some error occurs.
1515 static int pl330_submit_req(void *ch_id, struct pl330_req *r)
1517 struct pl330_thread *thrd = ch_id;
1518 struct pl330_dmac *pl330;
1519 struct pl330_info *pi;
1520 struct _xfer_spec xs;
1521 unsigned long flags;
1527 /* No Req or Unacquired Channel or DMAC */
1528 if (!r || !thrd || thrd->free)
1535 if (pl330->state == DYING
1536 || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) {
1537 dev_info(thrd->dmac->pinfo->dev, "%s:%d\n",
1538 __func__, __LINE__);
1542 /* If request for non-existing peripheral */
1543 if (r->rqtype != MEMTOMEM && r->peri >= pi->pcfg.num_peri) {
1544 dev_info(thrd->dmac->pinfo->dev,
1545 "%s:%d Invalid peripheral(%u)!\n",
1546 __func__, __LINE__, r->peri);
1550 spin_lock_irqsave(&pl330->lock, flags);
1552 if (_queue_full(thrd)) {
1558 /* Use last settings, if not provided */
1560 /* Prefer Secure Channel */
1561 if (!_manager_ns(thrd))
1562 r->cfg->nonsecure = 0;
1564 r->cfg->nonsecure = 1;
1566 ccr = _prepare_ccr(r->cfg);
1568 ccr = readl(regs + CC(thrd->id));
1571 /* If this req doesn't have valid xfer settings */
1572 if (!_is_valid(ccr)) {
1574 dev_info(thrd->dmac->pinfo->dev, "%s:%d Invalid CCR(%x)!\n",
1575 __func__, __LINE__, ccr);
1579 idx = IS_FREE(&thrd->req[0]) ? 0 : 1;
1584 /* First dry run to check if req is acceptable */
1585 ret = _setup_req(1, thrd, idx, &xs);
1589 if (ret > pi->mcbufsz / 2) {
1590 dev_info(thrd->dmac->pinfo->dev,
1591 "%s:%d Trying increasing mcbufsz\n",
1592 __func__, __LINE__);
1597 /* Hook the request */
1599 thrd->req[idx].mc_len = _setup_req(0, thrd, idx, &xs);
1600 thrd->req[idx].r = r;
1605 spin_unlock_irqrestore(&pl330->lock, flags);
1610 static void pl330_dotask(unsigned long data)
1612 struct pl330_dmac *pl330 = (struct pl330_dmac *) data;
1613 struct pl330_info *pi = pl330->pinfo;
1614 unsigned long flags;
1617 spin_lock_irqsave(&pl330->lock, flags);
1619 /* The DMAC itself gone nuts */
1620 if (pl330->dmac_tbd.reset_dmac) {
1621 pl330->state = DYING;
1622 /* Reset the manager too */
1623 pl330->dmac_tbd.reset_mngr = true;
1624 /* Clear the reset flag */
1625 pl330->dmac_tbd.reset_dmac = false;
1628 if (pl330->dmac_tbd.reset_mngr) {
1629 _stop(pl330->manager);
1630 /* Reset all channels */
1631 pl330->dmac_tbd.reset_chan = (1 << pi->pcfg.num_chan) - 1;
1632 /* Clear the reset flag */
1633 pl330->dmac_tbd.reset_mngr = false;
1636 for (i = 0; i < pi->pcfg.num_chan; i++) {
1638 if (pl330->dmac_tbd.reset_chan & (1 << i)) {
1639 struct pl330_thread *thrd = &pl330->channels[i];
1640 void __iomem *regs = pi->base;
1641 enum pl330_op_err err;
1645 if (readl(regs + FSC) & (1 << thrd->id))
1646 err = PL330_ERR_FAIL;
1648 err = PL330_ERR_ABORT;
1650 spin_unlock_irqrestore(&pl330->lock, flags);
1652 _callback(thrd->req[1 - thrd->lstenq].r, err);
1653 _callback(thrd->req[thrd->lstenq].r, err);
1655 spin_lock_irqsave(&pl330->lock, flags);
1657 thrd->req[0].r = NULL;
1658 thrd->req[1].r = NULL;
1662 /* Clear the reset flag */
1663 pl330->dmac_tbd.reset_chan &= ~(1 << i);
1667 spin_unlock_irqrestore(&pl330->lock, flags);
1672 /* Returns 1 if state was updated, 0 otherwise */
1673 static int pl330_update(const struct pl330_info *pi)
1675 struct pl330_req *rqdone, *tmp;
1676 struct pl330_dmac *pl330;
1677 unsigned long flags;
1680 int id, ev, ret = 0;
1682 if (!pi || !pi->pl330_data)
1686 pl330 = pi->pl330_data;
1688 spin_lock_irqsave(&pl330->lock, flags);
1690 val = readl(regs + FSM) & 0x1;
1692 pl330->dmac_tbd.reset_mngr = true;
1694 pl330->dmac_tbd.reset_mngr = false;
1696 val = readl(regs + FSC) & ((1 << pi->pcfg.num_chan) - 1);
1697 pl330->dmac_tbd.reset_chan |= val;
1700 while (i < pi->pcfg.num_chan) {
1701 if (val & (1 << i)) {
1703 "Reset Channel-%d\t CS-%x FTC-%x\n",
1704 i, readl(regs + CS(i)),
1705 readl(regs + FTC(i)));
1706 _stop(&pl330->channels[i]);
1712 /* Check which event happened i.e, thread notified */
1713 val = readl(regs + ES);
1714 if (pi->pcfg.num_events < 32
1715 && val & ~((1 << pi->pcfg.num_events) - 1)) {
1716 pl330->dmac_tbd.reset_dmac = true;
1717 dev_err(pi->dev, "%s:%d Unexpected!\n", __func__, __LINE__);
1722 for (ev = 0; ev < pi->pcfg.num_events; ev++) {
1723 if (val & (1 << ev)) { /* Event occurred */
1724 struct pl330_thread *thrd;
1725 u32 inten = readl(regs + INTEN);
1728 /* Clear the event */
1729 if (inten & (1 << ev))
1730 writel(1 << ev, regs + INTCLR);
1734 id = pl330->events[ev];
1736 thrd = &pl330->channels[id];
1738 active = thrd->req_running;
1739 if (active == -1) /* Aborted */
1742 /* Detach the req */
1743 rqdone = thrd->req[active].r;
1744 thrd->req[active].r = NULL;
1746 mark_free(thrd, active);
1748 /* Get going again ASAP */
1751 /* For now, just make a list of callbacks to be done */
1752 list_add_tail(&rqdone->rqd, &pl330->req_done);
1756 /* Now that we are in no hurry, do the callbacks */
1757 list_for_each_entry_safe(rqdone, tmp, &pl330->req_done, rqd) {
1758 list_del(&rqdone->rqd);
1760 spin_unlock_irqrestore(&pl330->lock, flags);
1761 _callback(rqdone, PL330_ERR_NONE);
1762 spin_lock_irqsave(&pl330->lock, flags);
1766 spin_unlock_irqrestore(&pl330->lock, flags);
1768 if (pl330->dmac_tbd.reset_dmac
1769 || pl330->dmac_tbd.reset_mngr
1770 || pl330->dmac_tbd.reset_chan) {
1772 tasklet_schedule(&pl330->tasks);
1778 static int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op)
1780 struct pl330_thread *thrd = ch_id;
1781 struct pl330_dmac *pl330;
1782 unsigned long flags;
1783 int ret = 0, active;
1785 if (!thrd || thrd->free || thrd->dmac->state == DYING)
1789 active = thrd->req_running;
1791 spin_lock_irqsave(&pl330->lock, flags);
1794 case PL330_OP_FLUSH:
1795 /* Make sure the channel is stopped */
1798 thrd->req[0].r = NULL;
1799 thrd->req[1].r = NULL;
1804 case PL330_OP_ABORT:
1805 /* Make sure the channel is stopped */
1808 /* ABORT is only for the active req */
1812 thrd->req[active].r = NULL;
1813 mark_free(thrd, active);
1815 /* Start the next */
1816 case PL330_OP_START:
1817 if ((active == -1) && !_start(thrd))
1825 spin_unlock_irqrestore(&pl330->lock, flags);
1829 /* Reserve an event */
1830 static inline int _alloc_event(struct pl330_thread *thrd)
1832 struct pl330_dmac *pl330 = thrd->dmac;
1833 struct pl330_info *pi = pl330->pinfo;
1836 for (ev = 0; ev < pi->pcfg.num_events; ev++)
1837 if (pl330->events[ev] == -1) {
1838 pl330->events[ev] = thrd->id;
1845 static bool _chan_ns(const struct pl330_info *pi, int i)
1847 return pi->pcfg.irq_ns & (1 << i);
1850 /* Upon success, returns IdentityToken for the
1851 * allocated channel, NULL otherwise.
1853 static void *pl330_request_channel(const struct pl330_info *pi)
1855 struct pl330_thread *thrd = NULL;
1856 struct pl330_dmac *pl330;
1857 unsigned long flags;
1860 if (!pi || !pi->pl330_data)
1863 pl330 = pi->pl330_data;
1865 if (pl330->state == DYING)
1868 chans = pi->pcfg.num_chan;
1870 spin_lock_irqsave(&pl330->lock, flags);
1872 for (i = 0; i < chans; i++) {
1873 thrd = &pl330->channels[i];
1874 if ((thrd->free) && (!_manager_ns(thrd) ||
1876 thrd->ev = _alloc_event(thrd);
1877 if (thrd->ev >= 0) {
1880 thrd->req[0].r = NULL;
1882 thrd->req[1].r = NULL;
1890 spin_unlock_irqrestore(&pl330->lock, flags);
1895 /* Release an event */
1896 static inline void _free_event(struct pl330_thread *thrd, int ev)
1898 struct pl330_dmac *pl330 = thrd->dmac;
1899 struct pl330_info *pi = pl330->pinfo;
1901 /* If the event is valid and was held by the thread */
1902 if (ev >= 0 && ev < pi->pcfg.num_events
1903 && pl330->events[ev] == thrd->id)
1904 pl330->events[ev] = -1;
1907 static void pl330_release_channel(void *ch_id)
1909 struct pl330_thread *thrd = ch_id;
1910 struct pl330_dmac *pl330;
1911 unsigned long flags;
1913 if (!thrd || thrd->free)
1918 _callback(thrd->req[1 - thrd->lstenq].r, PL330_ERR_ABORT);
1919 _callback(thrd->req[thrd->lstenq].r, PL330_ERR_ABORT);
1923 spin_lock_irqsave(&pl330->lock, flags);
1924 _free_event(thrd, thrd->ev);
1926 spin_unlock_irqrestore(&pl330->lock, flags);
1929 /* Initialize the structure for PL330 configuration, that can be used
1930 * by the client driver the make best use of the DMAC
1932 static void read_dmac_config(struct pl330_info *pi)
1934 void __iomem *regs = pi->base;
1937 val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
1938 val &= CRD_DATA_WIDTH_MASK;
1939 pi->pcfg.data_bus_width = 8 * (1 << val);
1941 val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
1942 val &= CRD_DATA_BUFF_MASK;
1943 pi->pcfg.data_buf_dep = val + 1;
1945 val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
1946 val &= CR0_NUM_CHANS_MASK;
1948 pi->pcfg.num_chan = val;
1950 val = readl(regs + CR0);
1951 if (val & CR0_PERIPH_REQ_SET) {
1952 val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
1954 pi->pcfg.num_peri = val;
1955 pi->pcfg.peri_ns = readl(regs + CR4);
1957 pi->pcfg.num_peri = 0;
1960 val = readl(regs + CR0);
1961 if (val & CR0_BOOT_MAN_NS)
1962 pi->pcfg.mode |= DMAC_MODE_NS;
1964 pi->pcfg.mode &= ~DMAC_MODE_NS;
1966 val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
1967 val &= CR0_NUM_EVENTS_MASK;
1969 pi->pcfg.num_events = val;
1971 pi->pcfg.irq_ns = readl(regs + CR3);
1974 static inline void _reset_thread(struct pl330_thread *thrd)
1976 struct pl330_dmac *pl330 = thrd->dmac;
1977 struct pl330_info *pi = pl330->pinfo;
1979 thrd->req[0].mc_cpu = pl330->mcode_cpu
1980 + (thrd->id * pi->mcbufsz);
1981 thrd->req[0].mc_bus = pl330->mcode_bus
1982 + (thrd->id * pi->mcbufsz);
1983 thrd->req[0].r = NULL;
1986 thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
1988 thrd->req[1].mc_bus = thrd->req[0].mc_bus
1990 thrd->req[1].r = NULL;
1994 static int dmac_alloc_threads(struct pl330_dmac *pl330)
1996 struct pl330_info *pi = pl330->pinfo;
1997 int chans = pi->pcfg.num_chan;
1998 struct pl330_thread *thrd;
2001 /* Allocate 1 Manager and 'chans' Channel threads */
2002 pl330->channels = kzalloc((1 + chans) * sizeof(*thrd),
2004 if (!pl330->channels)
2007 /* Init Channel threads */
2008 for (i = 0; i < chans; i++) {
2009 thrd = &pl330->channels[i];
2012 _reset_thread(thrd);
2016 /* MANAGER is indexed at the end */
2017 thrd = &pl330->channels[chans];
2021 pl330->manager = thrd;
2026 static int dmac_alloc_resources(struct pl330_dmac *pl330)
2028 struct pl330_info *pi = pl330->pinfo;
2029 int chans = pi->pcfg.num_chan;
2033 * Alloc MicroCode buffer for 'chans' Channel threads.
2034 * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
2036 pl330->mcode_cpu = dma_alloc_coherent(pi->dev,
2037 chans * pi->mcbufsz,
2038 &pl330->mcode_bus, GFP_KERNEL);
2039 if (!pl330->mcode_cpu) {
2040 dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
2041 __func__, __LINE__);
2045 ret = dmac_alloc_threads(pl330);
2047 dev_err(pi->dev, "%s:%d Can't to create channels for DMAC!\n",
2048 __func__, __LINE__);
2049 dma_free_coherent(pi->dev,
2050 chans * pi->mcbufsz,
2051 pl330->mcode_cpu, pl330->mcode_bus);
2058 static int pl330_add(struct pl330_info *pi)
2060 struct pl330_dmac *pl330;
2064 if (!pi || !pi->dev)
2067 /* If already added */
2072 * If the SoC can perform reset on the DMAC, then do it
2073 * before reading its configuration.
2080 /* Check if we can handle this DMAC */
2081 if ((pi->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) {
2082 dev_err(pi->dev, "PERIPH_ID 0x%x !\n", pi->pcfg.periph_id);
2086 /* Read the configuration of the DMAC */
2087 read_dmac_config(pi);
2089 if (pi->pcfg.num_events == 0) {
2090 dev_err(pi->dev, "%s:%d Can't work without events!\n",
2091 __func__, __LINE__);
2095 pl330 = kzalloc(sizeof(*pl330), GFP_KERNEL);
2097 dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
2098 __func__, __LINE__);
2102 /* Assign the info structure and private data */
2104 pi->pl330_data = pl330;
2106 spin_lock_init(&pl330->lock);
2108 INIT_LIST_HEAD(&pl330->req_done);
2110 /* Use default MC buffer size if not provided */
2112 pi->mcbufsz = MCODE_BUFF_PER_REQ * 2;
2114 /* Mark all events as free */
2115 for (i = 0; i < pi->pcfg.num_events; i++)
2116 pl330->events[i] = -1;
2118 /* Allocate resources needed by the DMAC */
2119 ret = dmac_alloc_resources(pl330);
2121 dev_err(pi->dev, "Unable to create channels for DMAC\n");
2126 tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330);
2128 pl330->state = INIT;
2133 static int dmac_free_threads(struct pl330_dmac *pl330)
2135 struct pl330_info *pi = pl330->pinfo;
2136 int chans = pi->pcfg.num_chan;
2137 struct pl330_thread *thrd;
2140 /* Release Channel threads */
2141 for (i = 0; i < chans; i++) {
2142 thrd = &pl330->channels[i];
2143 pl330_release_channel((void *)thrd);
2147 kfree(pl330->channels);
2152 static void dmac_free_resources(struct pl330_dmac *pl330)
2154 struct pl330_info *pi = pl330->pinfo;
2155 int chans = pi->pcfg.num_chan;
2157 dmac_free_threads(pl330);
2159 dma_free_coherent(pi->dev, chans * pi->mcbufsz,
2160 pl330->mcode_cpu, pl330->mcode_bus);
2163 static void pl330_del(struct pl330_info *pi)
2165 struct pl330_dmac *pl330;
2167 if (!pi || !pi->pl330_data)
2170 pl330 = pi->pl330_data;
2172 pl330->state = UNINIT;
2174 tasklet_kill(&pl330->tasks);
2176 /* Free DMAC resources */
2177 dmac_free_resources(pl330);
2180 pi->pl330_data = NULL;
2183 /* forward declaration */
2184 static struct amba_driver pl330_driver;
2186 static inline struct dma_pl330_chan *
2187 to_pchan(struct dma_chan *ch)
2192 return container_of(ch, struct dma_pl330_chan, chan);
2195 static inline struct dma_pl330_desc *
2196 to_desc(struct dma_async_tx_descriptor *tx)
2198 return container_of(tx, struct dma_pl330_desc, txd);
2201 static inline void free_desc_list(struct list_head *list)
2203 struct dma_pl330_dmac *pdmac;
2204 struct dma_pl330_desc *desc;
2205 struct dma_pl330_chan *pch = NULL;
2206 unsigned long flags;
2208 /* Finish off the work list */
2209 list_for_each_entry(desc, list, node) {
2210 dma_async_tx_callback callback;
2213 /* All desc in a list belong to same channel */
2215 callback = desc->txd.callback;
2216 param = desc->txd.callback_param;
2224 /* pch will be unset if list was empty */
2230 spin_lock_irqsave(&pdmac->pool_lock, flags);
2231 list_splice_tail_init(list, &pdmac->desc_pool);
2232 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
2235 static inline void handle_cyclic_desc_list(struct list_head *list)
2237 struct dma_pl330_desc *desc;
2238 struct dma_pl330_chan *pch = NULL;
2239 unsigned long flags;
2241 list_for_each_entry(desc, list, node) {
2242 dma_async_tx_callback callback;
2244 /* Change status to reload it */
2245 desc->status = PREP;
2247 callback = desc->txd.callback;
2249 callback(desc->txd.callback_param);
2252 /* pch will be unset if list was empty */
2256 spin_lock_irqsave(&pch->lock, flags);
2257 list_splice_tail_init(list, &pch->work_list);
2258 spin_unlock_irqrestore(&pch->lock, flags);
2261 static inline void fill_queue(struct dma_pl330_chan *pch)
2263 struct dma_pl330_desc *desc;
2266 list_for_each_entry(desc, &pch->work_list, node) {
2268 /* If already submitted */
2269 if (desc->status == BUSY)
2272 ret = pl330_submit_req(pch->pl330_chid,
2275 desc->status = BUSY;
2276 } else if (ret == -EAGAIN) {
2277 /* QFull or DMAC Dying */
2280 /* Unacceptable request */
2281 desc->status = DONE;
2282 dev_err(pch->dmac->pif.dev, "%s:%d Bad Desc(%d)\n",
2283 __func__, __LINE__, desc->txd.cookie);
2284 tasklet_schedule(&pch->task);
2289 static void pl330_tasklet(unsigned long data)
2291 struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
2292 struct dma_pl330_desc *desc, *_dt;
2293 unsigned long flags;
2296 spin_lock_irqsave(&pch->lock, flags);
2298 /* Pick up ripe tomatoes */
2299 list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
2300 if (desc->status == DONE) {
2302 dma_cookie_complete(&desc->txd);
2303 list_move_tail(&desc->node, &list);
2306 /* Try to submit a req imm. next to the last completed cookie */
2309 /* Make sure the PL330 Channel thread is active */
2310 pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START);
2312 spin_unlock_irqrestore(&pch->lock, flags);
2315 handle_cyclic_desc_list(&list);
2317 free_desc_list(&list);
2320 static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
2322 struct dma_pl330_desc *desc = token;
2323 struct dma_pl330_chan *pch = desc->pchan;
2324 unsigned long flags;
2326 /* If desc aborted */
2330 spin_lock_irqsave(&pch->lock, flags);
2332 desc->status = DONE;
2334 spin_unlock_irqrestore(&pch->lock, flags);
2336 tasklet_schedule(&pch->task);
2339 static bool pl330_dt_filter(struct dma_chan *chan, void *param)
2341 struct dma_pl330_filter_args *fargs = param;
2343 if (chan->device != &fargs->pdmac->ddma)
2346 return (chan->chan_id == fargs->chan_id);
2349 bool pl330_filter(struct dma_chan *chan, void *param)
2353 if (chan->device->dev->driver != &pl330_driver.drv)
2356 peri_id = chan->private;
2357 return *peri_id == (unsigned)param;
2359 EXPORT_SYMBOL(pl330_filter);
2361 static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
2362 struct of_dma *ofdma)
2364 int count = dma_spec->args_count;
2365 struct dma_pl330_dmac *pdmac = ofdma->of_dma_data;
2366 struct dma_pl330_filter_args fargs;
2375 fargs.pdmac = pdmac;
2376 fargs.chan_id = dma_spec->args[0];
2379 dma_cap_set(DMA_SLAVE, cap);
2380 dma_cap_set(DMA_CYCLIC, cap);
2382 return dma_request_channel(cap, pl330_dt_filter, &fargs);
2385 static int pl330_alloc_chan_resources(struct dma_chan *chan)
2387 struct dma_pl330_chan *pch = to_pchan(chan);
2388 struct dma_pl330_dmac *pdmac = pch->dmac;
2389 unsigned long flags;
2391 spin_lock_irqsave(&pch->lock, flags);
2393 dma_cookie_init(chan);
2394 pch->cyclic = false;
2396 pch->pl330_chid = pl330_request_channel(&pdmac->pif);
2397 if (!pch->pl330_chid) {
2398 spin_unlock_irqrestore(&pch->lock, flags);
2402 tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch);
2404 spin_unlock_irqrestore(&pch->lock, flags);
2409 static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg)
2411 struct dma_pl330_chan *pch = to_pchan(chan);
2412 struct dma_pl330_desc *desc, *_dt;
2413 unsigned long flags;
2414 struct dma_pl330_dmac *pdmac = pch->dmac;
2415 struct dma_slave_config *slave_config;
2419 case DMA_TERMINATE_ALL:
2420 spin_lock_irqsave(&pch->lock, flags);
2422 /* FLUSH the PL330 Channel thread */
2423 pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
2425 /* Mark all desc done */
2426 list_for_each_entry_safe(desc, _dt, &pch->work_list , node) {
2427 desc->status = DONE;
2428 list_move_tail(&desc->node, &list);
2431 list_splice_tail_init(&list, &pdmac->desc_pool);
2432 spin_unlock_irqrestore(&pch->lock, flags);
2434 case DMA_SLAVE_CONFIG:
2435 slave_config = (struct dma_slave_config *)arg;
2437 if (slave_config->direction == DMA_MEM_TO_DEV) {
2438 if (slave_config->dst_addr)
2439 pch->fifo_addr = slave_config->dst_addr;
2440 if (slave_config->dst_addr_width)
2441 pch->burst_sz = __ffs(slave_config->dst_addr_width);
2442 if (slave_config->dst_maxburst)
2443 pch->burst_len = slave_config->dst_maxburst;
2444 } else if (slave_config->direction == DMA_DEV_TO_MEM) {
2445 if (slave_config->src_addr)
2446 pch->fifo_addr = slave_config->src_addr;
2447 if (slave_config->src_addr_width)
2448 pch->burst_sz = __ffs(slave_config->src_addr_width);
2449 if (slave_config->src_maxburst)
2450 pch->burst_len = slave_config->src_maxburst;
2454 dev_err(pch->dmac->pif.dev, "Not supported command.\n");
2461 static void pl330_free_chan_resources(struct dma_chan *chan)
2463 struct dma_pl330_chan *pch = to_pchan(chan);
2464 unsigned long flags;
2466 tasklet_kill(&pch->task);
2468 spin_lock_irqsave(&pch->lock, flags);
2470 pl330_release_channel(pch->pl330_chid);
2471 pch->pl330_chid = NULL;
2474 list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
2476 spin_unlock_irqrestore(&pch->lock, flags);
2479 static enum dma_status
2480 pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
2481 struct dma_tx_state *txstate)
2483 return dma_cookie_status(chan, cookie, txstate);
2486 static void pl330_issue_pending(struct dma_chan *chan)
2488 pl330_tasklet((unsigned long) to_pchan(chan));
2492 * We returned the last one of the circular list of descriptor(s)
2493 * from prep_xxx, so the argument to submit corresponds to the last
2494 * descriptor of the list.
2496 static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
2498 struct dma_pl330_desc *desc, *last = to_desc(tx);
2499 struct dma_pl330_chan *pch = to_pchan(tx->chan);
2500 dma_cookie_t cookie;
2501 unsigned long flags;
2503 spin_lock_irqsave(&pch->lock, flags);
2505 /* Assign cookies to all nodes */
2506 while (!list_empty(&last->node)) {
2507 desc = list_entry(last->node.next, struct dma_pl330_desc, node);
2509 desc->txd.callback = last->txd.callback;
2510 desc->txd.callback_param = last->txd.callback_param;
2513 dma_cookie_assign(&desc->txd);
2515 list_move_tail(&desc->node, &pch->work_list);
2518 cookie = dma_cookie_assign(&last->txd);
2519 list_add_tail(&last->node, &pch->work_list);
2520 spin_unlock_irqrestore(&pch->lock, flags);
2525 static inline void _init_desc(struct dma_pl330_desc *desc)
2528 desc->req.x = &desc->px;
2529 desc->req.token = desc;
2530 desc->rqcfg.swap = SWAP_NO;
2531 desc->rqcfg.privileged = 0;
2532 desc->rqcfg.insnaccess = 0;
2533 desc->rqcfg.scctl = SCCTRL0;
2534 desc->rqcfg.dcctl = DCCTRL0;
2535 desc->req.cfg = &desc->rqcfg;
2536 desc->req.xfer_cb = dma_pl330_rqcb;
2537 desc->txd.tx_submit = pl330_tx_submit;
2539 INIT_LIST_HEAD(&desc->node);
2542 /* Returns the number of descriptors added to the DMAC pool */
2543 static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
2545 struct dma_pl330_desc *desc;
2546 unsigned long flags;
2552 desc = kmalloc(count * sizeof(*desc), flg);
2556 spin_lock_irqsave(&pdmac->pool_lock, flags);
2558 for (i = 0; i < count; i++) {
2559 _init_desc(&desc[i]);
2560 list_add_tail(&desc[i].node, &pdmac->desc_pool);
2563 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
2568 static struct dma_pl330_desc *
2569 pluck_desc(struct dma_pl330_dmac *pdmac)
2571 struct dma_pl330_desc *desc = NULL;
2572 unsigned long flags;
2577 spin_lock_irqsave(&pdmac->pool_lock, flags);
2579 if (!list_empty(&pdmac->desc_pool)) {
2580 desc = list_entry(pdmac->desc_pool.next,
2581 struct dma_pl330_desc, node);
2583 list_del_init(&desc->node);
2585 desc->status = PREP;
2586 desc->txd.callback = NULL;
2589 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
2594 static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
2596 struct dma_pl330_dmac *pdmac = pch->dmac;
2597 u8 *peri_id = pch->chan.private;
2598 struct dma_pl330_desc *desc;
2600 /* Pluck one desc from the pool of DMAC */
2601 desc = pluck_desc(pdmac);
2603 /* If the DMAC pool is empty, alloc new */
2605 if (!add_desc(pdmac, GFP_ATOMIC, 1))
2609 desc = pluck_desc(pdmac);
2611 dev_err(pch->dmac->pif.dev,
2612 "%s:%d ALERT!\n", __func__, __LINE__);
2617 /* Initialize the descriptor */
2619 desc->txd.cookie = 0;
2620 async_tx_ack(&desc->txd);
2622 desc->req.peri = peri_id ? pch->chan.chan_id : 0;
2623 desc->rqcfg.pcfg = &pch->dmac->pif.pcfg;
2625 dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
2630 static inline void fill_px(struct pl330_xfer *px,
2631 dma_addr_t dst, dma_addr_t src, size_t len)
2639 static struct dma_pl330_desc *
2640 __pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
2641 dma_addr_t src, size_t len)
2643 struct dma_pl330_desc *desc = pl330_get_desc(pch);
2646 dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
2647 __func__, __LINE__);
2652 * Ideally we should lookout for reqs bigger than
2653 * those that can be programmed with 256 bytes of
2654 * MC buffer, but considering a req size is seldom
2655 * going to be word-unaligned and more than 200MB,
2657 * Also, should the limit is reached we'd rather
2658 * have the platform increase MC buffer size than
2659 * complicating this API driver.
2661 fill_px(&desc->px, dst, src, len);
2666 /* Call after fixing burst size */
2667 static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
2669 struct dma_pl330_chan *pch = desc->pchan;
2670 struct pl330_info *pi = &pch->dmac->pif;
2673 burst_len = pi->pcfg.data_bus_width / 8;
2674 burst_len *= pi->pcfg.data_buf_dep;
2675 burst_len >>= desc->rqcfg.brst_size;
2677 /* src/dst_burst_len can't be more than 16 */
2681 while (burst_len > 1) {
2682 if (!(len % (burst_len << desc->rqcfg.brst_size)))
2690 static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
2691 struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
2692 size_t period_len, enum dma_transfer_direction direction,
2693 unsigned long flags, void *context)
2695 struct dma_pl330_desc *desc = NULL, *first = NULL;
2696 struct dma_pl330_chan *pch = to_pchan(chan);
2697 struct dma_pl330_dmac *pdmac = pch->dmac;
2702 if (len % period_len != 0)
2705 if (!is_slave_direction(direction)) {
2706 dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n",
2707 __func__, __LINE__);
2711 for (i = 0; i < len / period_len; i++) {
2712 desc = pl330_get_desc(pch);
2714 dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
2715 __func__, __LINE__);
2720 spin_lock_irqsave(&pdmac->pool_lock, flags);
2722 while (!list_empty(&first->node)) {
2723 desc = list_entry(first->node.next,
2724 struct dma_pl330_desc, node);
2725 list_move_tail(&desc->node, &pdmac->desc_pool);
2728 list_move_tail(&first->node, &pdmac->desc_pool);
2730 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
2735 switch (direction) {
2736 case DMA_MEM_TO_DEV:
2737 desc->rqcfg.src_inc = 1;
2738 desc->rqcfg.dst_inc = 0;
2739 desc->req.rqtype = MEMTODEV;
2741 dst = pch->fifo_addr;
2743 case DMA_DEV_TO_MEM:
2744 desc->rqcfg.src_inc = 0;
2745 desc->rqcfg.dst_inc = 1;
2746 desc->req.rqtype = DEVTOMEM;
2747 src = pch->fifo_addr;
2754 desc->rqcfg.brst_size = pch->burst_sz;
2755 desc->rqcfg.brst_len = 1;
2756 fill_px(&desc->px, dst, src, period_len);
2761 list_add_tail(&desc->node, &first->node);
2763 dma_addr += period_len;
2770 desc->txd.flags = flags;
2775 static struct dma_async_tx_descriptor *
2776 pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
2777 dma_addr_t src, size_t len, unsigned long flags)
2779 struct dma_pl330_desc *desc;
2780 struct dma_pl330_chan *pch = to_pchan(chan);
2781 struct pl330_info *pi;
2784 if (unlikely(!pch || !len))
2787 pi = &pch->dmac->pif;
2789 desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
2793 desc->rqcfg.src_inc = 1;
2794 desc->rqcfg.dst_inc = 1;
2795 desc->req.rqtype = MEMTOMEM;
2797 /* Select max possible burst size */
2798 burst = pi->pcfg.data_bus_width / 8;
2806 desc->rqcfg.brst_size = 0;
2807 while (burst != (1 << desc->rqcfg.brst_size))
2808 desc->rqcfg.brst_size++;
2810 desc->rqcfg.brst_len = get_burst_len(desc, len);
2812 desc->txd.flags = flags;
2817 static struct dma_async_tx_descriptor *
2818 pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2819 unsigned int sg_len, enum dma_transfer_direction direction,
2820 unsigned long flg, void *context)
2822 struct dma_pl330_desc *first, *desc = NULL;
2823 struct dma_pl330_chan *pch = to_pchan(chan);
2824 struct scatterlist *sg;
2825 unsigned long flags;
2829 if (unlikely(!pch || !sgl || !sg_len))
2832 addr = pch->fifo_addr;
2836 for_each_sg(sgl, sg, sg_len, i) {
2838 desc = pl330_get_desc(pch);
2840 struct dma_pl330_dmac *pdmac = pch->dmac;
2842 dev_err(pch->dmac->pif.dev,
2843 "%s:%d Unable to fetch desc\n",
2844 __func__, __LINE__);
2848 spin_lock_irqsave(&pdmac->pool_lock, flags);
2850 while (!list_empty(&first->node)) {
2851 desc = list_entry(first->node.next,
2852 struct dma_pl330_desc, node);
2853 list_move_tail(&desc->node, &pdmac->desc_pool);
2856 list_move_tail(&first->node, &pdmac->desc_pool);
2858 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
2866 list_add_tail(&desc->node, &first->node);
2868 if (direction == DMA_MEM_TO_DEV) {
2869 desc->rqcfg.src_inc = 1;
2870 desc->rqcfg.dst_inc = 0;
2871 desc->req.rqtype = MEMTODEV;
2873 addr, sg_dma_address(sg), sg_dma_len(sg));
2875 desc->rqcfg.src_inc = 0;
2876 desc->rqcfg.dst_inc = 1;
2877 desc->req.rqtype = DEVTOMEM;
2879 sg_dma_address(sg), addr, sg_dma_len(sg));
2882 desc->rqcfg.brst_size = pch->burst_sz;
2883 desc->rqcfg.brst_len = 1;
2886 /* Return the last desc in the chain */
2887 desc->txd.flags = flg;
2891 static irqreturn_t pl330_irq_handler(int irq, void *data)
2893 if (pl330_update(data))
2900 pl330_probe(struct amba_device *adev, const struct amba_id *id)
2902 struct dma_pl330_platdata *pdat;
2903 struct dma_pl330_dmac *pdmac;
2904 struct dma_pl330_chan *pch, *_p;
2905 struct pl330_info *pi;
2906 struct dma_device *pd;
2907 struct resource *res;
2911 pdat = adev->dev.platform_data;
2913 /* Allocate a new DMAC and its Channels */
2914 pdmac = devm_kzalloc(&adev->dev, sizeof(*pdmac), GFP_KERNEL);
2916 dev_err(&adev->dev, "unable to allocate mem\n");
2921 pi->dev = &adev->dev;
2922 pi->pl330_data = NULL;
2923 pi->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
2926 pi->base = devm_ioremap_resource(&adev->dev, res);
2927 if (IS_ERR(pi->base))
2928 return PTR_ERR(pi->base);
2930 amba_set_drvdata(adev, pdmac);
2933 ret = request_irq(irq, pl330_irq_handler, 0,
2934 dev_name(&adev->dev), pi);
2938 pi->pcfg.periph_id = adev->periphid;
2939 ret = pl330_add(pi);
2943 INIT_LIST_HEAD(&pdmac->desc_pool);
2944 spin_lock_init(&pdmac->pool_lock);
2946 /* Create a descriptor pool of default size */
2947 if (!add_desc(pdmac, GFP_KERNEL, NR_DEFAULT_DESC))
2948 dev_warn(&adev->dev, "unable to allocate desc\n");
2951 INIT_LIST_HEAD(&pd->channels);
2953 /* Initialize channel parameters */
2955 num_chan = max_t(int, pdat->nr_valid_peri, pi->pcfg.num_chan);
2957 num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan);
2959 pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
2960 if (!pdmac->peripherals) {
2962 dev_err(&adev->dev, "unable to allocate pdmac->peripherals\n");
2966 for (i = 0; i < num_chan; i++) {
2967 pch = &pdmac->peripherals[i];
2968 if (!adev->dev.of_node)
2969 pch->chan.private = pdat ? &pdat->peri_id[i] : NULL;
2971 pch->chan.private = adev->dev.of_node;
2973 INIT_LIST_HEAD(&pch->work_list);
2974 spin_lock_init(&pch->lock);
2975 pch->pl330_chid = NULL;
2976 pch->chan.device = pd;
2979 /* Add the channel to the DMAC list */
2980 list_add_tail(&pch->chan.device_node, &pd->channels);
2983 pd->dev = &adev->dev;
2985 pd->cap_mask = pdat->cap_mask;
2987 dma_cap_set(DMA_MEMCPY, pd->cap_mask);
2988 if (pi->pcfg.num_peri) {
2989 dma_cap_set(DMA_SLAVE, pd->cap_mask);
2990 dma_cap_set(DMA_CYCLIC, pd->cap_mask);
2991 dma_cap_set(DMA_PRIVATE, pd->cap_mask);
2995 pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
2996 pd->device_free_chan_resources = pl330_free_chan_resources;
2997 pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
2998 pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
2999 pd->device_tx_status = pl330_tx_status;
3000 pd->device_prep_slave_sg = pl330_prep_slave_sg;
3001 pd->device_control = pl330_control;
3002 pd->device_issue_pending = pl330_issue_pending;
3004 ret = dma_async_device_register(pd);
3006 dev_err(&adev->dev, "unable to register DMAC\n");
3010 if (adev->dev.of_node) {
3011 ret = of_dma_controller_register(adev->dev.of_node,
3012 of_dma_pl330_xlate, pdmac);
3015 "unable to register DMA to the generic DT DMA helpers\n");
3019 dev_info(&adev->dev,
3020 "Loaded driver for PL330 DMAC-%d\n", adev->periphid);
3021 dev_info(&adev->dev,
3022 "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
3023 pi->pcfg.data_buf_dep,
3024 pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan,
3025 pi->pcfg.num_peri, pi->pcfg.num_events);
3029 amba_set_drvdata(adev, NULL);
3032 list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
3035 /* Remove the channel */
3036 list_del(&pch->chan.device_node);
3038 /* Flush the channel */
3039 pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
3040 pl330_free_chan_resources(&pch->chan);
3050 static int pl330_remove(struct amba_device *adev)
3052 struct dma_pl330_dmac *pdmac = amba_get_drvdata(adev);
3053 struct dma_pl330_chan *pch, *_p;
3054 struct pl330_info *pi;
3060 if (adev->dev.of_node)
3061 of_dma_controller_free(adev->dev.of_node);
3063 dma_async_device_unregister(&pdmac->ddma);
3064 amba_set_drvdata(adev, NULL);
3067 list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
3070 /* Remove the channel */
3071 list_del(&pch->chan.device_node);
3073 /* Flush the channel */
3074 pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
3075 pl330_free_chan_resources(&pch->chan);
3088 static struct amba_id pl330_ids[] = {
3096 MODULE_DEVICE_TABLE(amba, pl330_ids);
3098 static struct amba_driver pl330_driver = {
3100 .owner = THIS_MODULE,
3101 .name = "dma-pl330",
3103 .id_table = pl330_ids,
3104 .probe = pl330_probe,
3105 .remove = pl330_remove,
3108 module_amba_driver(pl330_driver);
3110 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
3111 MODULE_DESCRIPTION("API Driver for PL330 DMAC");
3112 MODULE_LICENSE("GPL");