1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/device.h>
9 #include <linux/dmaengine.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/dma/qcom_adm.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_dma.h>
21 #include <linux/platform_device.h>
22 #include <linux/reset.h>
23 #include <linux/scatterlist.h>
24 #include <linux/slab.h>
25
26 #include "../dmaengine.h"
27 #include "../virt-dma.h"
28
29 /* ADM registers - calculated from channel number and security domain */
30 #define ADM_CHAN_MULTI 0x4
31 #define ADM_CI_MULTI 0x4
32 #define ADM_CRCI_MULTI 0x4
33 #define ADM_EE_MULTI 0x800
34 #define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
35 #define ADM_EE_OFFS(ee) (ADM_EE_MULTI * (ee))
36 #define ADM_CHAN_EE_OFFS(chan, ee) (ADM_CHAN_OFFS(chan) + ADM_EE_OFFS(ee))
37 #define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
38 #define ADM_CI_OFFS(ci) (ADM_CHAN_OFF(ci))
39 #define ADM_CH_CMD_PTR(chan, ee) (ADM_CHAN_EE_OFFS(chan, ee))
40 #define ADM_CH_RSLT(chan, ee) (0x40 + ADM_CHAN_EE_OFFS(chan, ee))
41 #define ADM_CH_FLUSH_STATE0(chan, ee) (0x80 + ADM_CHAN_EE_OFFS(chan, ee))
42 #define ADM_CH_STATUS_SD(chan, ee) (0x200 + ADM_CHAN_EE_OFFS(chan, ee))
43 #define ADM_CH_CONF(chan) (0x240 + ADM_CHAN_OFFS(chan))
44 #define ADM_CH_RSLT_CONF(chan, ee) (0x300 + ADM_CHAN_EE_OFFS(chan, ee))
45 #define ADM_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + ADM_EE_OFFS(ee))
46 #define ADM_CI_CONF(ci) (0x390 + (ci) * ADM_CI_MULTI)
47 #define ADM_GP_CTL 0x3d8
48 #define ADM_CRCI_CTL(crci, ee) (0x400 + (crci) * ADM_CRCI_MULTI + \
49 ADM_EE_OFFS(ee))
50
51 /* channel status */
52 #define ADM_CH_STATUS_VALID BIT(1)
53
54 /* channel result */
55 #define ADM_CH_RSLT_VALID BIT(31)
56 #define ADM_CH_RSLT_ERR BIT(3)
57 #define ADM_CH_RSLT_FLUSH BIT(2)
58 #define ADM_CH_RSLT_TPD BIT(1)
59
60 /* channel conf */
61 #define ADM_CH_CONF_SHADOW_EN BIT(12)
62 #define ADM_CH_CONF_MPU_DISABLE BIT(11)
63 #define ADM_CH_CONF_PERM_MPU_CONF BIT(9)
64 #define ADM_CH_CONF_FORCE_RSLT_EN BIT(7)
65 #define ADM_CH_CONF_SEC_DOMAIN(ee) ((((ee) & 0x3) << 4) | (((ee) & 0x4) << 11))
66
67 /* channel result conf */
68 #define ADM_CH_RSLT_CONF_FLUSH_EN BIT(1)
69 #define ADM_CH_RSLT_CONF_IRQ_EN BIT(0)
70
71 /* CRCI CTL */
72 #define ADM_CRCI_CTL_MUX_SEL BIT(18)
73 #define ADM_CRCI_CTL_RST BIT(17)
74
75 /* CI configuration */
76 #define ADM_CI_RANGE_END(x) ((x) << 24)
77 #define ADM_CI_RANGE_START(x) ((x) << 16)
78 #define ADM_CI_BURST_4_WORDS BIT(2)
79 #define ADM_CI_BURST_8_WORDS BIT(3)
80
81 /* GP CTL */
82 #define ADM_GP_CTL_LP_EN BIT(12)
83 #define ADM_GP_CTL_LP_CNT(x) ((x) << 8)
84
85 /* Command pointer list entry */
86 #define ADM_CPLE_LP BIT(31)
87 #define ADM_CPLE_CMD_PTR_LIST BIT(29)
88
89 /* Command list entry */
90 #define ADM_CMD_LC BIT(31)
91 #define ADM_CMD_DST_CRCI(n) (((n) & 0xf) << 7)
92 #define ADM_CMD_SRC_CRCI(n) (((n) & 0xf) << 3)
93
94 #define ADM_CMD_TYPE_SINGLE 0x0
95 #define ADM_CMD_TYPE_BOX 0x3
96
97 #define ADM_CRCI_MUX_SEL BIT(4)
98 #define ADM_DESC_ALIGN 8
99 #define ADM_MAX_XFER (SZ_64K - 1)
100 #define ADM_MAX_ROWS (SZ_64K - 1)
101 #define ADM_MAX_CHANNELS 16
102
103 struct adm_desc_hw_box {
104 u32 cmd;
105 u32 src_addr;
106 u32 dst_addr;
107 u32 row_len;
108 u32 num_rows;
109 u32 row_offset;
110 };
111
112 struct adm_desc_hw_single {
113 u32 cmd;
114 u32 src_addr;
115 u32 dst_addr;
116 u32 len;
117 };
118
119 struct adm_async_desc {
120 struct virt_dma_desc vd;
121 struct adm_device *adev;
122
123 size_t length;
124 enum dma_transfer_direction dir;
125 dma_addr_t dma_addr;
126 size_t dma_len;
127
128 void *cpl;
129 dma_addr_t cp_addr;
130 u32 crci;
131 u32 mux;
132 u32 blk_size;
133 };
134
135 struct adm_chan {
136 struct virt_dma_chan vc;
137 struct adm_device *adev;
138
139 /* parsed from DT */
140 u32 id; /* channel id */
141
142 struct adm_async_desc *curr_txd;
143 struct dma_slave_config slave;
144 u32 crci;
145 u32 mux;
146 struct list_head node;
147
148 int error;
149 int initialized;
150 };
151
to_adm_chan(struct dma_chan * common)152 static inline struct adm_chan *to_adm_chan(struct dma_chan *common)
153 {
154 return container_of(common, struct adm_chan, vc.chan);
155 }
156
157 struct adm_device {
158 void __iomem *regs;
159 struct device *dev;
160 struct dma_device common;
161 struct device_dma_parameters dma_parms;
162 struct adm_chan *channels;
163
164 u32 ee;
165
166 struct clk *core_clk;
167 struct clk *iface_clk;
168
169 struct reset_control *clk_reset;
170 struct reset_control *c0_reset;
171 struct reset_control *c1_reset;
172 struct reset_control *c2_reset;
173 int irq;
174 };
175
176 /**
177 * adm_free_chan - Frees dma resources associated with the specific channel
178 *
179 * @chan: dma channel
180 *
181 * Free all allocated descriptors associated with this channel
182 */
adm_free_chan(struct dma_chan * chan)183 static void adm_free_chan(struct dma_chan *chan)
184 {
185 /* free all queued descriptors */
186 vchan_free_chan_resources(to_virt_chan(chan));
187 }
188
189 /**
190 * adm_get_blksize - Get block size from burst value
191 *
192 * @burst: Burst size of transaction
193 */
adm_get_blksize(unsigned int burst)194 static int adm_get_blksize(unsigned int burst)
195 {
196 int ret;
197
198 switch (burst) {
199 case 16:
200 case 32:
201 case 64:
202 case 128:
203 ret = ffs(burst >> 4) - 1;
204 break;
205 case 192:
206 ret = 4;
207 break;
208 case 256:
209 ret = 5;
210 break;
211 default:
212 ret = -EINVAL;
213 break;
214 }
215
216 return ret;
217 }
218
219 /**
220 * adm_process_fc_descriptors - Process descriptors for flow controlled xfers
221 *
222 * @achan: ADM channel
223 * @desc: Descriptor memory pointer
224 * @sg: Scatterlist entry
225 * @crci: CRCI value
226 * @burst: Burst size of transaction
227 * @direction: DMA transfer direction
228 */
adm_process_fc_descriptors(struct adm_chan * achan,void * desc,struct scatterlist * sg,u32 crci,u32 burst,enum dma_transfer_direction direction)229 static void *adm_process_fc_descriptors(struct adm_chan *achan, void *desc,
230 struct scatterlist *sg, u32 crci,
231 u32 burst,
232 enum dma_transfer_direction direction)
233 {
234 struct adm_desc_hw_box *box_desc = NULL;
235 struct adm_desc_hw_single *single_desc;
236 u32 remainder = sg_dma_len(sg);
237 u32 rows, row_offset, crci_cmd;
238 u32 mem_addr = sg_dma_address(sg);
239 u32 *incr_addr = &mem_addr;
240 u32 *src, *dst;
241
242 if (direction == DMA_DEV_TO_MEM) {
243 crci_cmd = ADM_CMD_SRC_CRCI(crci);
244 row_offset = burst;
245 src = &achan->slave.src_addr;
246 dst = &mem_addr;
247 } else {
248 crci_cmd = ADM_CMD_DST_CRCI(crci);
249 row_offset = burst << 16;
250 src = &mem_addr;
251 dst = &achan->slave.dst_addr;
252 }
253
254 while (remainder >= burst) {
255 box_desc = desc;
256 box_desc->cmd = ADM_CMD_TYPE_BOX | crci_cmd;
257 box_desc->row_offset = row_offset;
258 box_desc->src_addr = *src;
259 box_desc->dst_addr = *dst;
260
261 rows = remainder / burst;
262 rows = min_t(u32, rows, ADM_MAX_ROWS);
263 box_desc->num_rows = rows << 16 | rows;
264 box_desc->row_len = burst << 16 | burst;
265
266 *incr_addr += burst * rows;
267 remainder -= burst * rows;
268 desc += sizeof(*box_desc);
269 }
270
271 /* if leftover bytes, do one single descriptor */
272 if (remainder) {
273 single_desc = desc;
274 single_desc->cmd = ADM_CMD_TYPE_SINGLE | crci_cmd;
275 single_desc->len = remainder;
276 single_desc->src_addr = *src;
277 single_desc->dst_addr = *dst;
278 desc += sizeof(*single_desc);
279
280 if (sg_is_last(sg))
281 single_desc->cmd |= ADM_CMD_LC;
282 } else {
283 if (box_desc && sg_is_last(sg))
284 box_desc->cmd |= ADM_CMD_LC;
285 }
286
287 return desc;
288 }
289
290 /**
291 * adm_process_non_fc_descriptors - Process descriptors for non-fc xfers
292 *
293 * @achan: ADM channel
294 * @desc: Descriptor memory pointer
295 * @sg: Scatterlist entry
296 * @direction: DMA transfer direction
297 */
adm_process_non_fc_descriptors(struct adm_chan * achan,void * desc,struct scatterlist * sg,enum dma_transfer_direction direction)298 static void *adm_process_non_fc_descriptors(struct adm_chan *achan, void *desc,
299 struct scatterlist *sg,
300 enum dma_transfer_direction direction)
301 {
302 struct adm_desc_hw_single *single_desc;
303 u32 remainder = sg_dma_len(sg);
304 u32 mem_addr = sg_dma_address(sg);
305 u32 *incr_addr = &mem_addr;
306 u32 *src, *dst;
307
308 if (direction == DMA_DEV_TO_MEM) {
309 src = &achan->slave.src_addr;
310 dst = &mem_addr;
311 } else {
312 src = &mem_addr;
313 dst = &achan->slave.dst_addr;
314 }
315
316 do {
317 single_desc = desc;
318 single_desc->cmd = ADM_CMD_TYPE_SINGLE;
319 single_desc->src_addr = *src;
320 single_desc->dst_addr = *dst;
321 single_desc->len = (remainder > ADM_MAX_XFER) ?
322 ADM_MAX_XFER : remainder;
323
324 remainder -= single_desc->len;
325 *incr_addr += single_desc->len;
326 desc += sizeof(*single_desc);
327 } while (remainder);
328
329 /* set last command if this is the end of the whole transaction */
330 if (sg_is_last(sg))
331 single_desc->cmd |= ADM_CMD_LC;
332
333 return desc;
334 }
335
336 /**
337 * adm_prep_slave_sg - Prep slave sg transaction
338 *
339 * @chan: dma channel
340 * @sgl: scatter gather list
341 * @sg_len: length of sg
342 * @direction: DMA transfer direction
343 * @flags: DMA flags
344 * @context: transfer context (unused)
345 */
adm_prep_slave_sg(struct dma_chan * chan,struct scatterlist * sgl,unsigned int sg_len,enum dma_transfer_direction direction,unsigned long flags,void * context)346 static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
347 struct scatterlist *sgl,
348 unsigned int sg_len,
349 enum dma_transfer_direction direction,
350 unsigned long flags,
351 void *context)
352 {
353 struct adm_chan *achan = to_adm_chan(chan);
354 struct adm_device *adev = achan->adev;
355 struct adm_async_desc *async_desc;
356 struct scatterlist *sg;
357 dma_addr_t cple_addr;
358 u32 i, burst;
359 u32 single_count = 0, box_count = 0, crci = 0;
360 void *desc;
361 u32 *cple;
362 int blk_size = 0;
363
364 if (!is_slave_direction(direction)) {
365 dev_err(adev->dev, "invalid dma direction\n");
366 return NULL;
367 }
368
369 /*
370 * get burst value from slave configuration
371 */
372 burst = (direction == DMA_MEM_TO_DEV) ?
373 achan->slave.dst_maxburst :
374 achan->slave.src_maxburst;
375
376 /* if using flow control, validate burst and crci values */
377 if (achan->slave.device_fc) {
378 blk_size = adm_get_blksize(burst);
379 if (blk_size < 0) {
380 dev_err(adev->dev, "invalid burst value: %d\n",
381 burst);
382 return NULL;
383 }
384
385 crci = achan->crci & 0xf;
386 if (!crci || achan->crci > 0x1f) {
387 dev_err(adev->dev, "invalid crci value\n");
388 return NULL;
389 }
390 }
391
392 /* iterate through sgs and compute allocation size of structures */
393 for_each_sg(sgl, sg, sg_len, i) {
394 if (achan->slave.device_fc) {
395 box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
396 ADM_MAX_ROWS);
397 if (sg_dma_len(sg) % burst)
398 single_count++;
399 } else {
400 single_count += DIV_ROUND_UP(sg_dma_len(sg),
401 ADM_MAX_XFER);
402 }
403 }
404
405 async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
406 if (!async_desc) {
407 dev_err(adev->dev, "not enough memory for async_desc struct\n");
408 return NULL;
409 }
410
411 async_desc->mux = achan->mux ? ADM_CRCI_CTL_MUX_SEL : 0;
412 async_desc->crci = crci;
413 async_desc->blk_size = blk_size;
414 async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
415 box_count * sizeof(struct adm_desc_hw_box) +
416 sizeof(*cple) + 2 * ADM_DESC_ALIGN;
417
418 async_desc->cpl = kzalloc(async_desc->dma_len, GFP_NOWAIT);
419 if (!async_desc->cpl) {
420 dev_err(adev->dev, "not enough memory for cpl struct\n");
421 goto free;
422 }
423
424 async_desc->adev = adev;
425
426 /* both command list entry and descriptors must be 8 byte aligned */
427 cple = PTR_ALIGN(async_desc->cpl, ADM_DESC_ALIGN);
428 desc = PTR_ALIGN(cple + 1, ADM_DESC_ALIGN);
429
430 for_each_sg(sgl, sg, sg_len, i) {
431 async_desc->length += sg_dma_len(sg);
432
433 if (achan->slave.device_fc)
434 desc = adm_process_fc_descriptors(achan, desc, sg, crci,
435 burst, direction);
436 else
437 desc = adm_process_non_fc_descriptors(achan, desc, sg,
438 direction);
439 }
440
441 async_desc->dma_addr = dma_map_single(adev->dev, async_desc->cpl,
442 async_desc->dma_len,
443 DMA_TO_DEVICE);
444 if (dma_mapping_error(adev->dev, async_desc->dma_addr)) {
445 dev_err(adev->dev, "dma mapping error for cpl\n");
446 goto free;
447 }
448
449 cple_addr = async_desc->dma_addr + ((void *)cple - async_desc->cpl);
450
451 /* init cmd list */
452 dma_sync_single_for_cpu(adev->dev, cple_addr, sizeof(*cple),
453 DMA_TO_DEVICE);
454 *cple = ADM_CPLE_LP;
455 *cple |= (async_desc->dma_addr + ADM_DESC_ALIGN) >> 3;
456 dma_sync_single_for_device(adev->dev, cple_addr, sizeof(*cple),
457 DMA_TO_DEVICE);
458
459 return vchan_tx_prep(&achan->vc, &async_desc->vd, flags);
460
461 free:
462 kfree(async_desc);
463 return NULL;
464 }
465
466 /**
467 * adm_terminate_all - terminate all transactions on a channel
468 * @chan: dma channel
469 *
470 * Dequeues and frees all transactions, aborts current transaction
471 * No callbacks are done
472 *
473 */
adm_terminate_all(struct dma_chan * chan)474 static int adm_terminate_all(struct dma_chan *chan)
475 {
476 struct adm_chan *achan = to_adm_chan(chan);
477 struct adm_device *adev = achan->adev;
478 unsigned long flags;
479 LIST_HEAD(head);
480
481 spin_lock_irqsave(&achan->vc.lock, flags);
482 vchan_get_all_descriptors(&achan->vc, &head);
483
484 /* send flush command to terminate current transaction */
485 writel_relaxed(0x0,
486 adev->regs + ADM_CH_FLUSH_STATE0(achan->id, adev->ee));
487
488 spin_unlock_irqrestore(&achan->vc.lock, flags);
489
490 vchan_dma_desc_free_list(&achan->vc, &head);
491
492 return 0;
493 }
494
adm_slave_config(struct dma_chan * chan,struct dma_slave_config * cfg)495 static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
496 {
497 struct adm_chan *achan = to_adm_chan(chan);
498 struct qcom_adm_peripheral_config *config = cfg->peripheral_config;
499 unsigned long flag;
500
501 spin_lock_irqsave(&achan->vc.lock, flag);
502 memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
503 if (cfg->peripheral_size == sizeof(*config))
504 achan->crci = config->crci;
505 spin_unlock_irqrestore(&achan->vc.lock, flag);
506
507 return 0;
508 }
509
510 /**
511 * adm_start_dma - start next transaction
512 * @achan: ADM dma channel
513 */
adm_start_dma(struct adm_chan * achan)514 static void adm_start_dma(struct adm_chan *achan)
515 {
516 struct virt_dma_desc *vd = vchan_next_desc(&achan->vc);
517 struct adm_device *adev = achan->adev;
518 struct adm_async_desc *async_desc;
519
520 lockdep_assert_held(&achan->vc.lock);
521
522 if (!vd)
523 return;
524
525 list_del(&vd->node);
526
527 /* write next command list out to the CMD FIFO */
528 async_desc = container_of(vd, struct adm_async_desc, vd);
529 achan->curr_txd = async_desc;
530
531 /* reset channel error */
532 achan->error = 0;
533
534 if (!achan->initialized) {
535 /* enable interrupts */
536 writel(ADM_CH_CONF_SHADOW_EN |
537 ADM_CH_CONF_PERM_MPU_CONF |
538 ADM_CH_CONF_MPU_DISABLE |
539 ADM_CH_CONF_SEC_DOMAIN(adev->ee),
540 adev->regs + ADM_CH_CONF(achan->id));
541
542 writel(ADM_CH_RSLT_CONF_IRQ_EN | ADM_CH_RSLT_CONF_FLUSH_EN,
543 adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
544
545 achan->initialized = 1;
546 }
547
548 /* set the crci block size if this transaction requires CRCI */
549 if (async_desc->crci) {
550 writel(async_desc->mux | async_desc->blk_size,
551 adev->regs + ADM_CRCI_CTL(async_desc->crci, adev->ee));
552 }
553
554 /* make sure IRQ enable doesn't get reordered */
555 wmb();
556
557 /* write next command list out to the CMD FIFO */
558 writel(ALIGN(async_desc->dma_addr, ADM_DESC_ALIGN) >> 3,
559 adev->regs + ADM_CH_CMD_PTR(achan->id, adev->ee));
560 }
561
562 /**
563 * adm_dma_irq - irq handler for ADM controller
564 * @irq: IRQ of interrupt
565 * @data: callback data
566 *
567 * IRQ handler for the bam controller
568 */
adm_dma_irq(int irq,void * data)569 static irqreturn_t adm_dma_irq(int irq, void *data)
570 {
571 struct adm_device *adev = data;
572 u32 srcs, i;
573 struct adm_async_desc *async_desc;
574 unsigned long flags;
575
576 srcs = readl_relaxed(adev->regs +
577 ADM_SEC_DOMAIN_IRQ_STATUS(adev->ee));
578
579 for (i = 0; i < ADM_MAX_CHANNELS; i++) {
580 struct adm_chan *achan = &adev->channels[i];
581 u32 status, result;
582
583 if (srcs & BIT(i)) {
584 status = readl_relaxed(adev->regs +
585 ADM_CH_STATUS_SD(i, adev->ee));
586
587 /* if no result present, skip */
588 if (!(status & ADM_CH_STATUS_VALID))
589 continue;
590
591 result = readl_relaxed(adev->regs +
592 ADM_CH_RSLT(i, adev->ee));
593
594 /* no valid results, skip */
595 if (!(result & ADM_CH_RSLT_VALID))
596 continue;
597
598 /* flag error if transaction was flushed or failed */
599 if (result & (ADM_CH_RSLT_ERR | ADM_CH_RSLT_FLUSH))
600 achan->error = 1;
601
602 spin_lock_irqsave(&achan->vc.lock, flags);
603 async_desc = achan->curr_txd;
604
605 achan->curr_txd = NULL;
606
607 if (async_desc) {
608 vchan_cookie_complete(&async_desc->vd);
609
610 /* kick off next DMA */
611 adm_start_dma(achan);
612 }
613
614 spin_unlock_irqrestore(&achan->vc.lock, flags);
615 }
616 }
617
618 return IRQ_HANDLED;
619 }
620
621 /**
622 * adm_tx_status - returns status of transaction
623 * @chan: dma channel
624 * @cookie: transaction cookie
625 * @txstate: DMA transaction state
626 *
627 * Return status of dma transaction
628 */
adm_tx_status(struct dma_chan * chan,dma_cookie_t cookie,struct dma_tx_state * txstate)629 static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
630 struct dma_tx_state *txstate)
631 {
632 struct adm_chan *achan = to_adm_chan(chan);
633 struct virt_dma_desc *vd;
634 enum dma_status ret;
635 unsigned long flags;
636 size_t residue = 0;
637
638 ret = dma_cookie_status(chan, cookie, txstate);
639 if (ret == DMA_COMPLETE || !txstate)
640 return ret;
641
642 spin_lock_irqsave(&achan->vc.lock, flags);
643
644 vd = vchan_find_desc(&achan->vc, cookie);
645 if (vd)
646 residue = container_of(vd, struct adm_async_desc, vd)->length;
647
648 spin_unlock_irqrestore(&achan->vc.lock, flags);
649
650 /*
651 * residue is either the full length if it is in the issued list, or 0
652 * if it is in progress. We have no reliable way of determining
653 * anything inbetween
654 */
655 dma_set_residue(txstate, residue);
656
657 if (achan->error)
658 return DMA_ERROR;
659
660 return ret;
661 }
662
663 /**
664 * adm_issue_pending - starts pending transactions
665 * @chan: dma channel
666 *
667 * Issues all pending transactions and starts DMA
668 */
adm_issue_pending(struct dma_chan * chan)669 static void adm_issue_pending(struct dma_chan *chan)
670 {
671 struct adm_chan *achan = to_adm_chan(chan);
672 unsigned long flags;
673
674 spin_lock_irqsave(&achan->vc.lock, flags);
675
676 if (vchan_issue_pending(&achan->vc) && !achan->curr_txd)
677 adm_start_dma(achan);
678 spin_unlock_irqrestore(&achan->vc.lock, flags);
679 }
680
681 /**
682 * adm_dma_free_desc - free descriptor memory
683 * @vd: virtual descriptor
684 *
685 */
adm_dma_free_desc(struct virt_dma_desc * vd)686 static void adm_dma_free_desc(struct virt_dma_desc *vd)
687 {
688 struct adm_async_desc *async_desc = container_of(vd,
689 struct adm_async_desc, vd);
690
691 dma_unmap_single(async_desc->adev->dev, async_desc->dma_addr,
692 async_desc->dma_len, DMA_TO_DEVICE);
693 kfree(async_desc->cpl);
694 kfree(async_desc);
695 }
696
adm_channel_init(struct adm_device * adev,struct adm_chan * achan,u32 index)697 static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan,
698 u32 index)
699 {
700 achan->id = index;
701 achan->adev = adev;
702
703 vchan_init(&achan->vc, &adev->common);
704 achan->vc.desc_free = adm_dma_free_desc;
705 }
706
707 /**
708 * adm_dma_xlate
709 * @dma_spec: pointer to DMA specifier as found in the device tree
710 * @ofdma: pointer to DMA controller data
711 *
712 * This can use either 1-cell or 2-cell formats, the first cell
713 * identifies the slave device, while the optional second cell
714 * contains the crci value.
715 *
716 * Returns pointer to appropriate dma channel on success or NULL on error.
717 */
adm_dma_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)718 static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
719 struct of_dma *ofdma)
720 {
721 struct dma_device *dev = ofdma->of_dma_data;
722 struct dma_chan *chan, *candidate = NULL;
723 struct adm_chan *achan;
724
725 if (!dev || dma_spec->args_count > 2)
726 return NULL;
727
728 list_for_each_entry(chan, &dev->channels, device_node)
729 if (chan->chan_id == dma_spec->args[0]) {
730 candidate = chan;
731 break;
732 }
733
734 if (!candidate)
735 return NULL;
736
737 achan = to_adm_chan(candidate);
738 if (dma_spec->args_count == 2)
739 achan->crci = dma_spec->args[1];
740 else
741 achan->crci = 0;
742
743 return dma_get_slave_channel(candidate);
744 }
745
adm_dma_probe(struct platform_device * pdev)746 static int adm_dma_probe(struct platform_device *pdev)
747 {
748 struct adm_device *adev;
749 int ret;
750 u32 i;
751
752 adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
753 if (!adev)
754 return -ENOMEM;
755
756 adev->dev = &pdev->dev;
757
758 adev->regs = devm_platform_ioremap_resource(pdev, 0);
759 if (IS_ERR(adev->regs))
760 return PTR_ERR(adev->regs);
761
762 adev->irq = platform_get_irq(pdev, 0);
763 if (adev->irq < 0)
764 return adev->irq;
765
766 ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &adev->ee);
767 if (ret) {
768 dev_err(adev->dev, "Execution environment unspecified\n");
769 return ret;
770 }
771
772 adev->core_clk = devm_clk_get(adev->dev, "core");
773 if (IS_ERR(adev->core_clk))
774 return PTR_ERR(adev->core_clk);
775
776 adev->iface_clk = devm_clk_get(adev->dev, "iface");
777 if (IS_ERR(adev->iface_clk))
778 return PTR_ERR(adev->iface_clk);
779
780 adev->clk_reset = devm_reset_control_get_exclusive(&pdev->dev, "clk");
781 if (IS_ERR(adev->clk_reset)) {
782 dev_err(adev->dev, "failed to get ADM0 reset\n");
783 return PTR_ERR(adev->clk_reset);
784 }
785
786 adev->c0_reset = devm_reset_control_get_exclusive(&pdev->dev, "c0");
787 if (IS_ERR(adev->c0_reset)) {
788 dev_err(adev->dev, "failed to get ADM0 C0 reset\n");
789 return PTR_ERR(adev->c0_reset);
790 }
791
792 adev->c1_reset = devm_reset_control_get_exclusive(&pdev->dev, "c1");
793 if (IS_ERR(adev->c1_reset)) {
794 dev_err(adev->dev, "failed to get ADM0 C1 reset\n");
795 return PTR_ERR(adev->c1_reset);
796 }
797
798 adev->c2_reset = devm_reset_control_get_exclusive(&pdev->dev, "c2");
799 if (IS_ERR(adev->c2_reset)) {
800 dev_err(adev->dev, "failed to get ADM0 C2 reset\n");
801 return PTR_ERR(adev->c2_reset);
802 }
803
804 ret = clk_prepare_enable(adev->core_clk);
805 if (ret) {
806 dev_err(adev->dev, "failed to prepare/enable core clock\n");
807 return ret;
808 }
809
810 ret = clk_prepare_enable(adev->iface_clk);
811 if (ret) {
812 dev_err(adev->dev, "failed to prepare/enable iface clock\n");
813 goto err_disable_core_clk;
814 }
815
816 reset_control_assert(adev->clk_reset);
817 reset_control_assert(adev->c0_reset);
818 reset_control_assert(adev->c1_reset);
819 reset_control_assert(adev->c2_reset);
820
821 udelay(2);
822
823 reset_control_deassert(adev->clk_reset);
824 reset_control_deassert(adev->c0_reset);
825 reset_control_deassert(adev->c1_reset);
826 reset_control_deassert(adev->c2_reset);
827
828 adev->channels = devm_kcalloc(adev->dev, ADM_MAX_CHANNELS,
829 sizeof(*adev->channels), GFP_KERNEL);
830
831 if (!adev->channels) {
832 ret = -ENOMEM;
833 goto err_disable_clks;
834 }
835
836 /* allocate and initialize channels */
837 INIT_LIST_HEAD(&adev->common.channels);
838
839 for (i = 0; i < ADM_MAX_CHANNELS; i++)
840 adm_channel_init(adev, &adev->channels[i], i);
841
842 /* reset CRCIs */
843 for (i = 0; i < 16; i++)
844 writel(ADM_CRCI_CTL_RST, adev->regs +
845 ADM_CRCI_CTL(i, adev->ee));
846
847 /* configure client interfaces */
848 writel(ADM_CI_RANGE_START(0x40) | ADM_CI_RANGE_END(0xb0) |
849 ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(0));
850 writel(ADM_CI_RANGE_START(0x2a) | ADM_CI_RANGE_END(0x2c) |
851 ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(1));
852 writel(ADM_CI_RANGE_START(0x12) | ADM_CI_RANGE_END(0x28) |
853 ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(2));
854 writel(ADM_GP_CTL_LP_EN | ADM_GP_CTL_LP_CNT(0xf),
855 adev->regs + ADM_GP_CTL);
856
857 ret = devm_request_irq(adev->dev, adev->irq, adm_dma_irq,
858 0, "adm_dma", adev);
859 if (ret)
860 goto err_disable_clks;
861
862 platform_set_drvdata(pdev, adev);
863
864 adev->common.dev = adev->dev;
865 adev->common.dev->dma_parms = &adev->dma_parms;
866
867 /* set capabilities */
868 dma_cap_zero(adev->common.cap_mask);
869 dma_cap_set(DMA_SLAVE, adev->common.cap_mask);
870 dma_cap_set(DMA_PRIVATE, adev->common.cap_mask);
871
872 /* initialize dmaengine apis */
873 adev->common.directions = BIT(DMA_DEV_TO_MEM | DMA_MEM_TO_DEV);
874 adev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
875 adev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
876 adev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
877 adev->common.device_free_chan_resources = adm_free_chan;
878 adev->common.device_prep_slave_sg = adm_prep_slave_sg;
879 adev->common.device_issue_pending = adm_issue_pending;
880 adev->common.device_tx_status = adm_tx_status;
881 adev->common.device_terminate_all = adm_terminate_all;
882 adev->common.device_config = adm_slave_config;
883
884 ret = dma_async_device_register(&adev->common);
885 if (ret) {
886 dev_err(adev->dev, "failed to register dma async device\n");
887 goto err_disable_clks;
888 }
889
890 ret = of_dma_controller_register(pdev->dev.of_node, adm_dma_xlate,
891 &adev->common);
892 if (ret)
893 goto err_unregister_dma;
894
895 return 0;
896
897 err_unregister_dma:
898 dma_async_device_unregister(&adev->common);
899 err_disable_clks:
900 clk_disable_unprepare(adev->iface_clk);
901 err_disable_core_clk:
902 clk_disable_unprepare(adev->core_clk);
903
904 return ret;
905 }
906
adm_dma_remove(struct platform_device * pdev)907 static int adm_dma_remove(struct platform_device *pdev)
908 {
909 struct adm_device *adev = platform_get_drvdata(pdev);
910 struct adm_chan *achan;
911 u32 i;
912
913 of_dma_controller_free(pdev->dev.of_node);
914 dma_async_device_unregister(&adev->common);
915
916 for (i = 0; i < ADM_MAX_CHANNELS; i++) {
917 achan = &adev->channels[i];
918
919 /* mask IRQs for this channel/EE pair */
920 writel(0, adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
921
922 tasklet_kill(&adev->channels[i].vc.task);
923 adm_terminate_all(&adev->channels[i].vc.chan);
924 }
925
926 devm_free_irq(adev->dev, adev->irq, adev);
927
928 clk_disable_unprepare(adev->core_clk);
929 clk_disable_unprepare(adev->iface_clk);
930
931 return 0;
932 }
933
934 static const struct of_device_id adm_of_match[] = {
935 { .compatible = "qcom,adm", },
936 {}
937 };
938 MODULE_DEVICE_TABLE(of, adm_of_match);
939
940 static struct platform_driver adm_dma_driver = {
941 .probe = adm_dma_probe,
942 .remove = adm_dma_remove,
943 .driver = {
944 .name = "adm-dma-engine",
945 .of_match_table = adm_of_match,
946 },
947 };
948
949 module_platform_driver(adm_dma_driver);
950
951 MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
952 MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
953 MODULE_LICENSE("GPL v2");
954