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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / dma / cppi41.c
blobc18aebf7d5aa9a23199b556bc9b54c8b3237253d
1 #include <linux/dmaengine.h>
2 #include <linux/dma-mapping.h>
3 #include <linux/platform_device.h>
4 #include <linux/module.h>
5 #include <linux/of.h>
6 #include <linux/slab.h>
7 #include <linux/of_dma.h>
8 #include <linux/of_irq.h>
9 #include <linux/dmapool.h>
10 #include <linux/interrupt.h>
11 #include <linux/of_address.h>
12 #include <linux/pm_runtime.h>
13 #include "dmaengine.h"
14
15 #define DESC_TYPE 27
16 #define DESC_TYPE_HOST 0x10
17 #define DESC_TYPE_TEARD 0x13
18
19 #define TD_DESC_IS_RX (1 << 16)
20 #define TD_DESC_DMA_NUM 10
21
22 #define DESC_LENGTH_BITS_NUM 21
23
24 #define DESC_TYPE_USB (5 << 26)
25 #define DESC_PD_COMPLETE (1 << 31)
26
27 /* DMA engine */
28 #define DMA_TDFDQ 4
29 #define DMA_TXGCR(x) (0x800 + (x) * 0x20)
30 #define DMA_RXGCR(x) (0x808 + (x) * 0x20)
31 #define RXHPCRA0 4
32
33 #define GCR_CHAN_ENABLE (1 << 31)
34 #define GCR_TEARDOWN (1 << 30)
35 #define GCR_STARV_RETRY (1 << 24)
36 #define GCR_DESC_TYPE_HOST (1 << 14)
37
38 /* DMA scheduler */
39 #define DMA_SCHED_CTRL 0
40 #define DMA_SCHED_CTRL_EN (1 << 31)
41 #define DMA_SCHED_WORD(x) ((x) * 4 + 0x800)
42
43 #define SCHED_ENTRY0_CHAN(x) ((x) << 0)
44 #define SCHED_ENTRY0_IS_RX (1 << 7)
45
46 #define SCHED_ENTRY1_CHAN(x) ((x) << 8)
47 #define SCHED_ENTRY1_IS_RX (1 << 15)
48
49 #define SCHED_ENTRY2_CHAN(x) ((x) << 16)
50 #define SCHED_ENTRY2_IS_RX (1 << 23)
51
52 #define SCHED_ENTRY3_CHAN(x) ((x) << 24)
53 #define SCHED_ENTRY3_IS_RX (1 << 31)
54
55 /* Queue manager */
56 /* 4 KiB of memory for descriptors, 2 for each endpoint */
57 #define ALLOC_DECS_NUM 128
58 #define DESCS_AREAS 1
59 #define TOTAL_DESCS_NUM (ALLOC_DECS_NUM * DESCS_AREAS)
60 #define QMGR_SCRATCH_SIZE (TOTAL_DESCS_NUM * 4)
61
62 #define QMGR_LRAM0_BASE 0x80
63 #define QMGR_LRAM_SIZE 0x84
64 #define QMGR_LRAM1_BASE 0x88
65 #define QMGR_MEMBASE(x) (0x1000 + (x) * 0x10)
66 #define QMGR_MEMCTRL(x) (0x1004 + (x) * 0x10)
67 #define QMGR_MEMCTRL_IDX_SH 16
68 #define QMGR_MEMCTRL_DESC_SH 8
69
70 #define QMGR_NUM_PEND 5
71 #define QMGR_PEND(x) (0x90 + (x) * 4)
72
73 #define QMGR_PENDING_SLOT_Q(x) (x / 32)
74 #define QMGR_PENDING_BIT_Q(x) (x % 32)
75
76 #define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10)
77 #define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10)
78 #define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10)
79 #define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10)
80
81 /* Glue layer specific */
82 /* USBSS / USB AM335x */
83 #define USBSS_IRQ_STATUS 0x28
84 #define USBSS_IRQ_ENABLER 0x2c
85 #define USBSS_IRQ_CLEARR 0x30
86
87 #define USBSS_IRQ_PD_COMP (1 << 2)
88
89 struct cppi41_channel {
90 struct dma_chan chan;
91 struct dma_async_tx_descriptor txd;
92 struct cppi41_dd *cdd;
93 struct cppi41_desc *desc;
94 dma_addr_t desc_phys;
95 void __iomem *gcr_reg;
96 int is_tx;
97 u32 residue;
98
99 unsigned int q_num;
100 unsigned int q_comp_num;
101 unsigned int port_num;
102
103 unsigned td_retry;
104 unsigned td_queued:1;
105 unsigned td_seen:1;
106 unsigned td_desc_seen:1;
107 };
108
109 struct cppi41_desc {
110 u32 pd0;
111 u32 pd1;
112 u32 pd2;
113 u32 pd3;
114 u32 pd4;
115 u32 pd5;
116 u32 pd6;
117 u32 pd7;
118 } __aligned(32);
119
120 struct chan_queues {
121 u16 submit;
122 u16 complete;
123 };
124
125 struct cppi41_dd {
126 struct dma_device ddev;
127
128 void *qmgr_scratch;
129 dma_addr_t scratch_phys;
130
131 struct cppi41_desc *cd;
132 dma_addr_t descs_phys;
133 u32 first_td_desc;
134 struct cppi41_channel *chan_busy[ALLOC_DECS_NUM];
135
136 void __iomem *usbss_mem;
137 void __iomem *ctrl_mem;
138 void __iomem *sched_mem;
139 void __iomem *qmgr_mem;
140 unsigned int irq;
141 const struct chan_queues *queues_rx;
142 const struct chan_queues *queues_tx;
143 struct chan_queues td_queue;
144
145 /* context for suspend/resume */
146 unsigned int dma_tdfdq;
147 };
148
149 #define FIST_COMPLETION_QUEUE 93
150 static struct chan_queues usb_queues_tx[] = {
151 /* USB0 ENDP 1 */
152 [ 0] = { .submit = 32, .complete = 93},
153 [ 1] = { .submit = 34, .complete = 94},
154 [ 2] = { .submit = 36, .complete = 95},
155 [ 3] = { .submit = 38, .complete = 96},
156 [ 4] = { .submit = 40, .complete = 97},
157 [ 5] = { .submit = 42, .complete = 98},
158 [ 6] = { .submit = 44, .complete = 99},
159 [ 7] = { .submit = 46, .complete = 100},
160 [ 8] = { .submit = 48, .complete = 101},
161 [ 9] = { .submit = 50, .complete = 102},
162 [10] = { .submit = 52, .complete = 103},
163 [11] = { .submit = 54, .complete = 104},
164 [12] = { .submit = 56, .complete = 105},
165 [13] = { .submit = 58, .complete = 106},
166 [14] = { .submit = 60, .complete = 107},
167
168 /* USB1 ENDP1 */
169 [15] = { .submit = 62, .complete = 125},
170 [16] = { .submit = 64, .complete = 126},
171 [17] = { .submit = 66, .complete = 127},
172 [18] = { .submit = 68, .complete = 128},
173 [19] = { .submit = 70, .complete = 129},
174 [20] = { .submit = 72, .complete = 130},
175 [21] = { .submit = 74, .complete = 131},
176 [22] = { .submit = 76, .complete = 132},
177 [23] = { .submit = 78, .complete = 133},
178 [24] = { .submit = 80, .complete = 134},
179 [25] = { .submit = 82, .complete = 135},
180 [26] = { .submit = 84, .complete = 136},
181 [27] = { .submit = 86, .complete = 137},
182 [28] = { .submit = 88, .complete = 138},
183 [29] = { .submit = 90, .complete = 139},
184 };
185
186 static const struct chan_queues usb_queues_rx[] = {
187 /* USB0 ENDP 1 */
188 [ 0] = { .submit = 1, .complete = 109},
189 [ 1] = { .submit = 2, .complete = 110},
190 [ 2] = { .submit = 3, .complete = 111},
191 [ 3] = { .submit = 4, .complete = 112},
192 [ 4] = { .submit = 5, .complete = 113},
193 [ 5] = { .submit = 6, .complete = 114},
194 [ 6] = { .submit = 7, .complete = 115},
195 [ 7] = { .submit = 8, .complete = 116},
196 [ 8] = { .submit = 9, .complete = 117},
197 [ 9] = { .submit = 10, .complete = 118},
198 [10] = { .submit = 11, .complete = 119},
199 [11] = { .submit = 12, .complete = 120},
200 [12] = { .submit = 13, .complete = 121},
201 [13] = { .submit = 14, .complete = 122},
202 [14] = { .submit = 15, .complete = 123},
203
204 /* USB1 ENDP 1 */
205 [15] = { .submit = 16, .complete = 141},
206 [16] = { .submit = 17, .complete = 142},
207 [17] = { .submit = 18, .complete = 143},
208 [18] = { .submit = 19, .complete = 144},
209 [19] = { .submit = 20, .complete = 145},
210 [20] = { .submit = 21, .complete = 146},
211 [21] = { .submit = 22, .complete = 147},
212 [22] = { .submit = 23, .complete = 148},
213 [23] = { .submit = 24, .complete = 149},
214 [24] = { .submit = 25, .complete = 150},
215 [25] = { .submit = 26, .complete = 151},
216 [26] = { .submit = 27, .complete = 152},
217 [27] = { .submit = 28, .complete = 153},
218 [28] = { .submit = 29, .complete = 154},
219 [29] = { .submit = 30, .complete = 155},
220 };
221
222 struct cppi_glue_infos {
223 irqreturn_t (*isr)(int irq, void *data);
224 const struct chan_queues *queues_rx;
225 const struct chan_queues *queues_tx;
226 struct chan_queues td_queue;
227 };
228
229 static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c)
230 {
231 return container_of(c, struct cppi41_channel, chan);
232 }
233
234 static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc)
235 {
236 struct cppi41_channel *c;
237 u32 descs_size;
238 u32 desc_num;
239
240 descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM;
241
242 if (!((desc >= cdd->descs_phys) &&
243 (desc < (cdd->descs_phys + descs_size)))) {
244 return NULL;
245 }
246
247 desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc);
248 BUG_ON(desc_num >= ALLOC_DECS_NUM);
249 c = cdd->chan_busy[desc_num];
250 cdd->chan_busy[desc_num] = NULL;
251 return c;
252 }
253
254 static void cppi_writel(u32 val, void *__iomem *mem)
255 {
256 __raw_writel(val, mem);
257 }
258
259 static u32 cppi_readl(void *__iomem *mem)
260 {
261 return __raw_readl(mem);
262 }
263
264 static u32 pd_trans_len(u32 val)
265 {
266 return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1);
267 }
268
269 static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num)
270 {
271 u32 desc;
272
273 desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num));
274 desc &= ~0x1f;
275 return desc;
276 }
277
278 static irqreturn_t cppi41_irq(int irq, void *data)
279 {
280 struct cppi41_dd *cdd = data;
281 struct cppi41_channel *c;
282 u32 status;
283 int i;
284
285 status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
286 if (!(status & USBSS_IRQ_PD_COMP))
287 return IRQ_NONE;
288 cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
289
290 for (i = QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE); i < QMGR_NUM_PEND;
291 i++) {
292 u32 val;
293 u32 q_num;
294
295 val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i));
296 if (i == QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE) && val) {
297 u32 mask;
298 /* set corresponding bit for completetion Q 93 */
299 mask = 1 << QMGR_PENDING_BIT_Q(FIST_COMPLETION_QUEUE);
300 /* not set all bits for queues less than Q 93 */
301 mask--;
302 /* now invert and keep only Q 93+ set */
303 val &= ~mask;
304 }
305
306 if (val)
307 __iormb();
308
309 while (val) {
310 u32 desc;
311
312 q_num = __fls(val);
313 val &= ~(1 << q_num);
314 q_num += 32 * i;
315 desc = cppi41_pop_desc(cdd, q_num);
316 c = desc_to_chan(cdd, desc);
317 if (WARN_ON(!c)) {
318 pr_err("%s() q %d desc %08x\n", __func__,
319 q_num, desc);
320 continue;
321 }
322 c->residue = pd_trans_len(c->desc->pd6) -
323 pd_trans_len(c->desc->pd0);
324
325 dma_cookie_complete(&c->txd);
326 c->txd.callback(c->txd.callback_param);
327 }
328 }
329 return IRQ_HANDLED;
330 }
331
332 static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
333 {
334 dma_cookie_t cookie;
335
336 cookie = dma_cookie_assign(tx);
337
338 return cookie;
339 }
340
341 static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan)
342 {
343 struct cppi41_channel *c = to_cpp41_chan(chan);
344
345 dma_cookie_init(chan);
346 dma_async_tx_descriptor_init(&c->txd, chan);
347 c->txd.tx_submit = cppi41_tx_submit;
348
349 if (!c->is_tx)
350 cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
351
352 return 0;
353 }
354
355 static void cppi41_dma_free_chan_resources(struct dma_chan *chan)
356 {
357 }
358
359 static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan,
360 dma_cookie_t cookie, struct dma_tx_state *txstate)
361 {
362 struct cppi41_channel *c = to_cpp41_chan(chan);
363 enum dma_status ret;
364
365 /* lock */
366 ret = dma_cookie_status(chan, cookie, txstate);
367 if (txstate && ret == DMA_COMPLETE)
368 txstate->residue = c->residue;
369 /* unlock */
370
371 return ret;
372 }
373
374 static void push_desc_queue(struct cppi41_channel *c)
375 {
376 struct cppi41_dd *cdd = c->cdd;
377 u32 desc_num;
378 u32 desc_phys;
379 u32 reg;
380
381 desc_phys = lower_32_bits(c->desc_phys);
382 desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
383 WARN_ON(cdd->chan_busy[desc_num]);
384 cdd->chan_busy[desc_num] = c;
385
386 reg = (sizeof(struct cppi41_desc) - 24) / 4;
387 reg |= desc_phys;
388 cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
389 }
390
391 static void cppi41_dma_issue_pending(struct dma_chan *chan)
392 {
393 struct cppi41_channel *c = to_cpp41_chan(chan);
394 u32 reg;
395
396 c->residue = 0;
397
398 reg = GCR_CHAN_ENABLE;
399 if (!c->is_tx) {
400 reg |= GCR_STARV_RETRY;
401 reg |= GCR_DESC_TYPE_HOST;
402 reg |= c->q_comp_num;
403 }
404
405 cppi_writel(reg, c->gcr_reg);
406
407 /*
408 * We don't use writel() but __raw_writel() so we have to make sure
409 * that the DMA descriptor in coherent memory made to the main memory
410 * before starting the dma engine.
411 */
412 __iowmb();
413 push_desc_queue(c);
414 }
415
416 static u32 get_host_pd0(u32 length)
417 {
418 u32 reg;
419
420 reg = DESC_TYPE_HOST << DESC_TYPE;
421 reg |= length;
422
423 return reg;
424 }
425
426 static u32 get_host_pd1(struct cppi41_channel *c)
427 {
428 u32 reg;
429
430 reg = 0;
431
432 return reg;
433 }
434
435 static u32 get_host_pd2(struct cppi41_channel *c)
436 {
437 u32 reg;
438
439 reg = DESC_TYPE_USB;
440 reg |= c->q_comp_num;
441
442 return reg;
443 }
444
445 static u32 get_host_pd3(u32 length)
446 {
447 u32 reg;
448
449 /* PD3 = packet size */
450 reg = length;
451
452 return reg;
453 }
454
455 static u32 get_host_pd6(u32 length)
456 {
457 u32 reg;
458
459 /* PD6 buffer size */
460 reg = DESC_PD_COMPLETE;
461 reg |= length;
462
463 return reg;
464 }
465
466 static u32 get_host_pd4_or_7(u32 addr)
467 {
468 u32 reg;
469
470 reg = addr;
471
472 return reg;
473 }
474
475 static u32 get_host_pd5(void)
476 {
477 u32 reg;
478
479 reg = 0;
480
481 return reg;
482 }
483
484 static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
485 struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len,
486 enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
487 {
488 struct cppi41_channel *c = to_cpp41_chan(chan);
489 struct cppi41_desc *d;
490 struct scatterlist *sg;
491 unsigned int i;
492 unsigned int num;
493
494 num = 0;
495 d = c->desc;
496 for_each_sg(sgl, sg, sg_len, i) {
497 u32 addr;
498 u32 len;
499
500 /* We need to use more than one desc once musb supports sg */
501 BUG_ON(num > 0);
502 addr = lower_32_bits(sg_dma_address(sg));
503 len = sg_dma_len(sg);
504
505 d->pd0 = get_host_pd0(len);
506 d->pd1 = get_host_pd1(c);
507 d->pd2 = get_host_pd2(c);
508 d->pd3 = get_host_pd3(len);
509 d->pd4 = get_host_pd4_or_7(addr);
510 d->pd5 = get_host_pd5();
511 d->pd6 = get_host_pd6(len);
512 d->pd7 = get_host_pd4_or_7(addr);
513
514 d++;
515 }
516
517 return &c->txd;
518 }
519
520 static int cpp41_cfg_chan(struct cppi41_channel *c,
521 struct dma_slave_config *cfg)
522 {
523 return 0;
524 }
525
526 static void cppi41_compute_td_desc(struct cppi41_desc *d)
527 {
528 d->pd0 = DESC_TYPE_TEARD << DESC_TYPE;
529 }
530
531 static int cppi41_tear_down_chan(struct cppi41_channel *c)
532 {
533 struct cppi41_dd *cdd = c->cdd;
534 struct cppi41_desc *td;
535 u32 reg;
536 u32 desc_phys;
537 u32 td_desc_phys;
538
539 td = cdd->cd;
540 td += cdd->first_td_desc;
541
542 td_desc_phys = cdd->descs_phys;
543 td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc);
544
545 if (!c->td_queued) {
546 cppi41_compute_td_desc(td);
547 __iowmb();
548
549 reg = (sizeof(struct cppi41_desc) - 24) / 4;
550 reg |= td_desc_phys;
551 cppi_writel(reg, cdd->qmgr_mem +
552 QMGR_QUEUE_D(cdd->td_queue.submit));
553
554 reg = GCR_CHAN_ENABLE;
555 if (!c->is_tx) {
556 reg |= GCR_STARV_RETRY;
557 reg |= GCR_DESC_TYPE_HOST;
558 reg |= c->q_comp_num;
559 }
560 reg |= GCR_TEARDOWN;
561 cppi_writel(reg, c->gcr_reg);
562 c->td_queued = 1;
563 c->td_retry = 100;
564 }
565
566 if (!c->td_seen || !c->td_desc_seen) {
567
568 desc_phys = cppi41_pop_desc(cdd, cdd->td_queue.complete);
569 if (!desc_phys)
570 desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
571
572 if (desc_phys == c->desc_phys) {
573 c->td_desc_seen = 1;
574
575 } else if (desc_phys == td_desc_phys) {
576 u32 pd0;
577
578 __iormb();
579 pd0 = td->pd0;
580 WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD);
581 WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX));
582 WARN_ON((pd0 & 0x1f) != c->port_num);
583 c->td_seen = 1;
584 } else if (desc_phys) {
585 WARN_ON_ONCE(1);
586 }
587 }
588 c->td_retry--;
589 /*
590 * If the TX descriptor / channel is in use, the caller needs to poke
591 * his TD bit multiple times. After that he hardware releases the
592 * transfer descriptor followed by TD descriptor. Waiting seems not to
593 * cause any difference.
594 * RX seems to be thrown out right away. However once the TearDown
595 * descriptor gets through we are done. If we have seens the transfer
596 * descriptor before the TD we fetch it from enqueue, it has to be
597 * there waiting for us.
598 */
599 if (!c->td_seen && c->td_retry)
600 return -EAGAIN;
601
602 WARN_ON(!c->td_retry);
603 if (!c->td_desc_seen) {
604 desc_phys = cppi41_pop_desc(cdd, c->q_num);
605 WARN_ON(!desc_phys);
606 }
607
608 c->td_queued = 0;
609 c->td_seen = 0;
610 c->td_desc_seen = 0;
611 cppi_writel(0, c->gcr_reg);
612 return 0;
613 }
614
615 static int cppi41_stop_chan(struct dma_chan *chan)
616 {
617 struct cppi41_channel *c = to_cpp41_chan(chan);
618 struct cppi41_dd *cdd = c->cdd;
619 u32 desc_num;
620 u32 desc_phys;
621 int ret;
622
623 ret = cppi41_tear_down_chan(c);
624 if (ret)
625 return ret;
626
627 desc_phys = lower_32_bits(c->desc_phys);
628 desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
629 WARN_ON(!cdd->chan_busy[desc_num]);
630 cdd->chan_busy[desc_num] = NULL;
631
632 return 0;
633 }
634
635 static int cppi41_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
636 unsigned long arg)
637 {
638 struct cppi41_channel *c = to_cpp41_chan(chan);
639 int ret;
640
641 switch (cmd) {
642 case DMA_SLAVE_CONFIG:
643 ret = cpp41_cfg_chan(c, (struct dma_slave_config *) arg);
644 break;
645
646 case DMA_TERMINATE_ALL:
647 ret = cppi41_stop_chan(chan);
648 break;
649
650 default:
651 ret = -ENXIO;
652 break;
653 }
654 return ret;
655 }
656
657 static void cleanup_chans(struct cppi41_dd *cdd)
658 {
659 while (!list_empty(&cdd->ddev.channels)) {
660 struct cppi41_channel *cchan;
661
662 cchan = list_first_entry(&cdd->ddev.channels,
663 struct cppi41_channel, chan.device_node);
664 list_del(&cchan->chan.device_node);
665 kfree(cchan);
666 }
667 }
668
669 static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd)
670 {
671 struct cppi41_channel *cchan;
672 int i;
673 int ret;
674 u32 n_chans;
675
676 ret = of_property_read_u32(dev->of_node, "#dma-channels",
677 &n_chans);
678 if (ret)
679 return ret;
680 /*
681 * The channels can only be used as TX or as RX. So we add twice
682 * that much dma channels because USB can only do RX or TX.
683 */
684 n_chans *= 2;
685
686 for (i = 0; i < n_chans; i++) {
687 cchan = kzalloc(sizeof(*cchan), GFP_KERNEL);
688 if (!cchan)
689 goto err;
690
691 cchan->cdd = cdd;
692 if (i & 1) {
693 cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1);
694 cchan->is_tx = 1;
695 } else {
696 cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1);
697 cchan->is_tx = 0;
698 }
699 cchan->port_num = i >> 1;
700 cchan->desc = &cdd->cd[i];
701 cchan->desc_phys = cdd->descs_phys;
702 cchan->desc_phys += i * sizeof(struct cppi41_desc);
703 cchan->chan.device = &cdd->ddev;
704 list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels);
705 }
706 cdd->first_td_desc = n_chans;
707
708 return 0;
709 err:
710 cleanup_chans(cdd);
711 return -ENOMEM;
712 }
713
714 static void purge_descs(struct device *dev, struct cppi41_dd *cdd)
715 {
716 unsigned int mem_decs;
717 int i;
718
719 mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc);
720
721 for (i = 0; i < DESCS_AREAS; i++) {
722
723 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i));
724 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i));
725
726 dma_free_coherent(dev, mem_decs, cdd->cd,
727 cdd->descs_phys);
728 }
729 }
730
731 static void disable_sched(struct cppi41_dd *cdd)
732 {
733 cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
734 }
735
736 static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd)
737 {
738 disable_sched(cdd);
739
740 purge_descs(dev, cdd);
741
742 cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
743 cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
744 dma_free_coherent(dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch,
745 cdd->scratch_phys);
746 }
747
748 static int init_descs(struct device *dev, struct cppi41_dd *cdd)
749 {
750 unsigned int desc_size;
751 unsigned int mem_decs;
752 int i;
753 u32 reg;
754 u32 idx;
755
756 BUILD_BUG_ON(sizeof(struct cppi41_desc) &
757 (sizeof(struct cppi41_desc) - 1));
758 BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32);
759 BUILD_BUG_ON(ALLOC_DECS_NUM < 32);
760
761 desc_size = sizeof(struct cppi41_desc);
762 mem_decs = ALLOC_DECS_NUM * desc_size;
763
764 idx = 0;
765 for (i = 0; i < DESCS_AREAS; i++) {
766
767 reg = idx << QMGR_MEMCTRL_IDX_SH;
768 reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH;
769 reg |= ilog2(ALLOC_DECS_NUM) - 5;
770
771 BUILD_BUG_ON(DESCS_AREAS != 1);
772 cdd->cd = dma_alloc_coherent(dev, mem_decs,
773 &cdd->descs_phys, GFP_KERNEL);
774 if (!cdd->cd)
775 return -ENOMEM;
776
777 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
778 cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
779
780 idx += ALLOC_DECS_NUM;
781 }
782 return 0;
783 }
784
785 static void init_sched(struct cppi41_dd *cdd)
786 {
787 unsigned ch;
788 unsigned word;
789 u32 reg;
790
791 word = 0;
792 cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
793 for (ch = 0; ch < 15 * 2; ch += 2) {
794
795 reg = SCHED_ENTRY0_CHAN(ch);
796 reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
797
798 reg |= SCHED_ENTRY2_CHAN(ch + 1);
799 reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX;
800 cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word));
801 word++;
802 }
803 reg = 15 * 2 * 2 - 1;
804 reg |= DMA_SCHED_CTRL_EN;
805 cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);
806 }
807
808 static int init_cppi41(struct device *dev, struct cppi41_dd *cdd)
809 {
810 int ret;
811
812 BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1));
813 cdd->qmgr_scratch = dma_alloc_coherent(dev, QMGR_SCRATCH_SIZE,
814 &cdd->scratch_phys, GFP_KERNEL);
815 if (!cdd->qmgr_scratch)
816 return -ENOMEM;
817
818 cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
819 cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
820 cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
821
822 ret = init_descs(dev, cdd);
823 if (ret)
824 goto err_td;
825
826 cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
827 init_sched(cdd);
828 return 0;
829 err_td:
830 deinit_cppi41(dev, cdd);
831 return ret;
832 }
833
834 static struct platform_driver cpp41_dma_driver;
835 /*
836 * The param format is:
837 * X Y
838 * X: Port
839 * Y: 0 = RX else TX
840 */
841 #define INFO_PORT 0
842 #define INFO_IS_TX 1
843
844 static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param)
845 {
846 struct cppi41_channel *cchan;
847 struct cppi41_dd *cdd;
848 const struct chan_queues *queues;
849 u32 *num = param;
850
851 if (chan->device->dev->driver != &cpp41_dma_driver.driver)
852 return false;
853
854 cchan = to_cpp41_chan(chan);
855
856 if (cchan->port_num != num[INFO_PORT])
857 return false;
858
859 if (cchan->is_tx && !num[INFO_IS_TX])
860 return false;
861 cdd = cchan->cdd;
862 if (cchan->is_tx)
863 queues = cdd->queues_tx;
864 else
865 queues = cdd->queues_rx;
866
867 BUILD_BUG_ON(ARRAY_SIZE(usb_queues_rx) != ARRAY_SIZE(usb_queues_tx));
868 if (WARN_ON(cchan->port_num > ARRAY_SIZE(usb_queues_rx)))
869 return false;
870
871 cchan->q_num = queues[cchan->port_num].submit;
872 cchan->q_comp_num = queues[cchan->port_num].complete;
873 return true;
874 }
875
876 static struct of_dma_filter_info cpp41_dma_info = {
877 .filter_fn = cpp41_dma_filter_fn,
878 };
879
880 static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec,
881 struct of_dma *ofdma)
882 {
883 int count = dma_spec->args_count;
884 struct of_dma_filter_info *info = ofdma->of_dma_data;
885
886 if (!info || !info->filter_fn)
887 return NULL;
888
889 if (count != 2)
890 return NULL;
891
892 return dma_request_channel(info->dma_cap, info->filter_fn,
893 &dma_spec->args[0]);
894 }
895
896 static const struct cppi_glue_infos usb_infos = {
897 .isr = cppi41_irq,
898 .queues_rx = usb_queues_rx,
899 .queues_tx = usb_queues_tx,
900 .td_queue = { .submit = 31, .complete = 0 },
901 };
902
903 static const struct of_device_id cppi41_dma_ids[] = {
904 { .compatible = "ti,am3359-cppi41", .data = &usb_infos},
905 {},
906 };
907 MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
908
909 static const struct cppi_glue_infos *get_glue_info(struct device *dev)
910 {
911 const struct of_device_id *of_id;
912
913 of_id = of_match_node(cppi41_dma_ids, dev->of_node);
914 if (!of_id)
915 return NULL;
916 return of_id->data;
917 }
918
919 static int cppi41_dma_probe(struct platform_device *pdev)
920 {
921 struct cppi41_dd *cdd;
922 struct device *dev = &pdev->dev;
923 const struct cppi_glue_infos *glue_info;
924 int irq;
925 int ret;
926
927 glue_info = get_glue_info(dev);
928 if (!glue_info)
929 return -EINVAL;
930
931 cdd = kzalloc(sizeof(*cdd), GFP_KERNEL);
932 if (!cdd)
933 return -ENOMEM;
934
935 dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask);
936 cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources;
937 cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources;
938 cdd->ddev.device_tx_status = cppi41_dma_tx_status;
939 cdd->ddev.device_issue_pending = cppi41_dma_issue_pending;
940 cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg;
941 cdd->ddev.device_control = cppi41_dma_control;
942 cdd->ddev.dev = dev;
943 INIT_LIST_HEAD(&cdd->ddev.channels);
944 cpp41_dma_info.dma_cap = cdd->ddev.cap_mask;
945
946 cdd->usbss_mem = of_iomap(dev->of_node, 0);
947 cdd->ctrl_mem = of_iomap(dev->of_node, 1);
948 cdd->sched_mem = of_iomap(dev->of_node, 2);
949 cdd->qmgr_mem = of_iomap(dev->of_node, 3);
950
951 if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
952 !cdd->qmgr_mem) {
953 ret = -ENXIO;
954 goto err_remap;
955 }
956
957 pm_runtime_enable(dev);
958 ret = pm_runtime_get_sync(dev);
959 if (ret < 0)
960 goto err_get_sync;
961
962 cdd->queues_rx = glue_info->queues_rx;
963 cdd->queues_tx = glue_info->queues_tx;
964 cdd->td_queue = glue_info->td_queue;
965
966 ret = init_cppi41(dev, cdd);
967 if (ret)
968 goto err_init_cppi;
969
970 ret = cppi41_add_chans(dev, cdd);
971 if (ret)
972 goto err_chans;
973
974 irq = irq_of_parse_and_map(dev->of_node, 0);
975 if (!irq) {
976 ret = -EINVAL;
977 goto err_irq;
978 }
979
980 cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
981
982 ret = request_irq(irq, glue_info->isr, IRQF_SHARED,
983 dev_name(dev), cdd);
984 if (ret)
985 goto err_irq;
986 cdd->irq = irq;
987
988 ret = dma_async_device_register(&cdd->ddev);
989 if (ret)
990 goto err_dma_reg;
991
992 ret = of_dma_controller_register(dev->of_node,
993 cppi41_dma_xlate, &cpp41_dma_info);
994 if (ret)
995 goto err_of;
996
997 platform_set_drvdata(pdev, cdd);
998 return 0;
999 err_of:
1000 dma_async_device_unregister(&cdd->ddev);
1001 err_dma_reg:
1002 free_irq(irq, cdd);
1003 err_irq:
1004 cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1005 cleanup_chans(cdd);
1006 err_chans:
1007 deinit_cppi41(dev, cdd);
1008 err_init_cppi:
1009 pm_runtime_put(dev);
1010 err_get_sync:
1011 pm_runtime_disable(dev);
1012 iounmap(cdd->usbss_mem);
1013 iounmap(cdd->ctrl_mem);
1014 iounmap(cdd->sched_mem);
1015 iounmap(cdd->qmgr_mem);
1016 err_remap:
1017 kfree(cdd);
1018 return ret;
1019 }
1020
1021 static int cppi41_dma_remove(struct platform_device *pdev)
1022 {
1023 struct cppi41_dd *cdd = platform_get_drvdata(pdev);
1024
1025 of_dma_controller_free(pdev->dev.of_node);
1026 dma_async_device_unregister(&cdd->ddev);
1027
1028 cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1029 free_irq(cdd->irq, cdd);
1030 cleanup_chans(cdd);
1031 deinit_cppi41(&pdev->dev, cdd);
1032 iounmap(cdd->usbss_mem);
1033 iounmap(cdd->ctrl_mem);
1034 iounmap(cdd->sched_mem);
1035 iounmap(cdd->qmgr_mem);
1036 pm_runtime_put(&pdev->dev);
1037 pm_runtime_disable(&pdev->dev);
1038 kfree(cdd);
1039 return 0;
1040 }
1041
1042 #ifdef CONFIG_PM_SLEEP
1043 static int cppi41_suspend(struct device *dev)
1044 {
1045 struct cppi41_dd *cdd = dev_get_drvdata(dev);
1046
1047 cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ);
1048 cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1049 disable_sched(cdd);
1050
1051 return 0;
1052 }
1053
1054 static int cppi41_resume(struct device *dev)
1055 {
1056 struct cppi41_dd *cdd = dev_get_drvdata(dev);
1057 struct cppi41_channel *c;
1058 int i;
1059
1060 for (i = 0; i < DESCS_AREAS; i++)
1061 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
1062
1063 list_for_each_entry(c, &cdd->ddev.channels, chan.device_node)
1064 if (!c->is_tx)
1065 cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
1066
1067 init_sched(cdd);
1068
1069 cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ);
1070 cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
1071 cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
1072 cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
1073
1074 cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
1075
1076 return 0;
1077 }
1078 #endif
1079
1080 static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);
1081
1082 static struct platform_driver cpp41_dma_driver = {
1083 .probe = cppi41_dma_probe,
1084 .remove = cppi41_dma_remove,
1085 .driver = {
1086 .name = "cppi41-dma-engine",
1087 .owner = THIS_MODULE,
1088 .pm = &cppi41_pm_ops,
1089 .of_match_table = of_match_ptr(cppi41_dma_ids),
1090 },
1091 };
1092
1093 module_platform_driver(cpp41_dma_driver);
1094 MODULE_LICENSE("GPL");
1095 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
Linux with added FPC-III support