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1/*
2 * Copyright (C) 2017 Spreadtrum Communications Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6
7#include <linux/clk.h>
8#include <linux/dma-mapping.h>
9#include <linux/dma/sprd-dma.h>
10#include <linux/errno.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_dma.h>
18#include <linux/platform_device.h>
19#include <linux/pm_runtime.h>
20#include <linux/slab.h>
21
22#include "virt-dma.h"
23
24#define SPRD_DMA_CHN_REG_OFFSET 0x1000
25#define SPRD_DMA_CHN_REG_LENGTH 0x40
26#define SPRD_DMA_MEMCPY_MIN_SIZE 64
27
28/* DMA global registers definition */
29#define SPRD_DMA_GLB_PAUSE 0x0
30#define SPRD_DMA_GLB_FRAG_WAIT 0x4
31#define SPRD_DMA_GLB_REQ_PEND0_EN 0x8
32#define SPRD_DMA_GLB_REQ_PEND1_EN 0xc
33#define SPRD_DMA_GLB_INT_RAW_STS 0x10
34#define SPRD_DMA_GLB_INT_MSK_STS 0x14
35#define SPRD_DMA_GLB_REQ_STS 0x18
36#define SPRD_DMA_GLB_CHN_EN_STS 0x1c
37#define SPRD_DMA_GLB_DEBUG_STS 0x20
38#define SPRD_DMA_GLB_ARB_SEL_STS 0x24
39#define SPRD_DMA_GLB_2STAGE_GRP1 0x28
40#define SPRD_DMA_GLB_2STAGE_GRP2 0x2c
41#define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1))
42#define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000
43
44/* DMA channel registers definition */
45#define SPRD_DMA_CHN_PAUSE 0x0
46#define SPRD_DMA_CHN_REQ 0x4
47#define SPRD_DMA_CHN_CFG 0x8
48#define SPRD_DMA_CHN_INTC 0xc
49#define SPRD_DMA_CHN_SRC_ADDR 0x10
50#define SPRD_DMA_CHN_DES_ADDR 0x14
51#define SPRD_DMA_CHN_FRG_LEN 0x18
52#define SPRD_DMA_CHN_BLK_LEN 0x1c
53#define SPRD_DMA_CHN_TRSC_LEN 0x20
54#define SPRD_DMA_CHN_TRSF_STEP 0x24
55#define SPRD_DMA_CHN_WARP_PTR 0x28
56#define SPRD_DMA_CHN_WARP_TO 0x2c
57#define SPRD_DMA_CHN_LLIST_PTR 0x30
58#define SPRD_DMA_CHN_FRAG_STEP 0x34
59#define SPRD_DMA_CHN_SRC_BLK_STEP 0x38
60#define SPRD_DMA_CHN_DES_BLK_STEP 0x3c
61
62/* SPRD_DMA_GLB_2STAGE_GRP register definition */
63#define SPRD_DMA_GLB_2STAGE_EN BIT(24)
64#define SPRD_DMA_GLB_CHN_INT_MASK GENMASK(23, 20)
65#define SPRD_DMA_GLB_DEST_INT BIT(22)
66#define SPRD_DMA_GLB_SRC_INT BIT(20)
67#define SPRD_DMA_GLB_LIST_DONE_TRG BIT(19)
68#define SPRD_DMA_GLB_TRANS_DONE_TRG BIT(18)
69#define SPRD_DMA_GLB_BLOCK_DONE_TRG BIT(17)
70#define SPRD_DMA_GLB_FRAG_DONE_TRG BIT(16)
71#define SPRD_DMA_GLB_TRG_OFFSET 16
72#define SPRD_DMA_GLB_DEST_CHN_MASK GENMASK(13, 8)
73#define SPRD_DMA_GLB_DEST_CHN_OFFSET 8
74#define SPRD_DMA_GLB_SRC_CHN_MASK GENMASK(5, 0)
75
76/* SPRD_DMA_CHN_INTC register definition */
77#define SPRD_DMA_INT_MASK GENMASK(4, 0)
78#define SPRD_DMA_INT_CLR_OFFSET 24
79#define SPRD_DMA_FRAG_INT_EN BIT(0)
80#define SPRD_DMA_BLK_INT_EN BIT(1)
81#define SPRD_DMA_TRANS_INT_EN BIT(2)
82#define SPRD_DMA_LIST_INT_EN BIT(3)
83#define SPRD_DMA_CFG_ERR_INT_EN BIT(4)
84
85/* SPRD_DMA_CHN_CFG register definition */
86#define SPRD_DMA_CHN_EN BIT(0)
87#define SPRD_DMA_LINKLIST_EN BIT(4)
88#define SPRD_DMA_WAIT_BDONE_OFFSET 24
89#define SPRD_DMA_DONOT_WAIT_BDONE 1
90
91/* SPRD_DMA_CHN_REQ register definition */
92#define SPRD_DMA_REQ_EN BIT(0)
93
94/* SPRD_DMA_CHN_PAUSE register definition */
95#define SPRD_DMA_PAUSE_EN BIT(0)
96#define SPRD_DMA_PAUSE_STS BIT(2)
97#define SPRD_DMA_PAUSE_CNT 0x2000
98
99/* DMA_CHN_WARP_* register definition */
100#define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28)
101#define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0)
102#define SPRD_DMA_WRAP_ADDR_MASK GENMASK(27, 0)
103#define SPRD_DMA_HIGH_ADDR_OFFSET 4
104
105/* SPRD_DMA_CHN_INTC register definition */
106#define SPRD_DMA_FRAG_INT_STS BIT(16)
107#define SPRD_DMA_BLK_INT_STS BIT(17)
108#define SPRD_DMA_TRSC_INT_STS BIT(18)
109#define SPRD_DMA_LIST_INT_STS BIT(19)
110#define SPRD_DMA_CFGERR_INT_STS BIT(20)
111#define SPRD_DMA_CHN_INT_STS \
112 (SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \
113 SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \
114 SPRD_DMA_CFGERR_INT_STS)
115
116/* SPRD_DMA_CHN_FRG_LEN register definition */
117#define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30
118#define SPRD_DMA_DES_DATAWIDTH_OFFSET 28
119#define SPRD_DMA_SWT_MODE_OFFSET 26
120#define SPRD_DMA_REQ_MODE_OFFSET 24
121#define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0)
122#define SPRD_DMA_WRAP_SEL_DEST BIT(23)
123#define SPRD_DMA_WRAP_EN BIT(22)
124#define SPRD_DMA_FIX_SEL_OFFSET 21
125#define SPRD_DMA_FIX_EN_OFFSET 20
126#define SPRD_DMA_LLIST_END BIT(19)
127#define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0)
128
129/* SPRD_DMA_CHN_BLK_LEN register definition */
130#define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0)
131
132/* SPRD_DMA_CHN_TRSC_LEN register definition */
133#define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0)
134
135/* SPRD_DMA_CHN_TRSF_STEP register definition */
136#define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16
137#define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0
138#define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0)
139
140/* SPRD DMA_SRC_BLK_STEP register definition */
141#define SPRD_DMA_LLIST_HIGH_MASK GENMASK(31, 28)
142#define SPRD_DMA_LLIST_HIGH_SHIFT 28
143
144/* define DMA channel mode & trigger mode mask */
145#define SPRD_DMA_CHN_MODE_MASK GENMASK(7, 0)
146#define SPRD_DMA_TRG_MODE_MASK GENMASK(7, 0)
147#define SPRD_DMA_INT_TYPE_MASK GENMASK(7, 0)
148
149/* define the DMA transfer step type */
150#define SPRD_DMA_NONE_STEP 0
151#define SPRD_DMA_BYTE_STEP 1
152#define SPRD_DMA_SHORT_STEP 2
153#define SPRD_DMA_WORD_STEP 4
154#define SPRD_DMA_DWORD_STEP 8
155
156#define SPRD_DMA_SOFTWARE_UID 0
157
158/* dma data width values */
159enum sprd_dma_datawidth {
160 SPRD_DMA_DATAWIDTH_1_BYTE,
161 SPRD_DMA_DATAWIDTH_2_BYTES,
162 SPRD_DMA_DATAWIDTH_4_BYTES,
163 SPRD_DMA_DATAWIDTH_8_BYTES,
164};
165
166/* dma channel hardware configuration */
167struct sprd_dma_chn_hw {
168 u32 pause;
169 u32 req;
170 u32 cfg;
171 u32 intc;
172 u32 src_addr;
173 u32 des_addr;
174 u32 frg_len;
175 u32 blk_len;
176 u32 trsc_len;
177 u32 trsf_step;
178 u32 wrap_ptr;
179 u32 wrap_to;
180 u32 llist_ptr;
181 u32 frg_step;
182 u32 src_blk_step;
183 u32 des_blk_step;
184};
185
186/* dma request description */
187struct sprd_dma_desc {
188 struct virt_dma_desc vd;
189 struct sprd_dma_chn_hw chn_hw;
190 enum dma_transfer_direction dir;
191};
192
193/* dma channel description */
194struct sprd_dma_chn {
195 struct virt_dma_chan vc;
196 void __iomem *chn_base;
197 struct sprd_dma_linklist linklist;
198 struct dma_slave_config slave_cfg;
199 u32 chn_num;
200 u32 dev_id;
201 enum sprd_dma_chn_mode chn_mode;
202 enum sprd_dma_trg_mode trg_mode;
203 enum sprd_dma_int_type int_type;
204 struct sprd_dma_desc *cur_desc;
205};
206
207/* SPRD dma device */
208struct sprd_dma_dev {
209 struct dma_device dma_dev;
210 void __iomem *glb_base;
211 struct clk *clk;
212 struct clk *ashb_clk;
213 int irq;
214 u32 total_chns;
215 struct sprd_dma_chn channels[] __counted_by(total_chns);
216};
217
218static void sprd_dma_free_desc(struct virt_dma_desc *vd);
219static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
220static struct of_dma_filter_info sprd_dma_info = {
221 .filter_fn = sprd_dma_filter_fn,
222};
223
224static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c)
225{
226 return container_of(c, struct sprd_dma_chn, vc.chan);
227}
228
229static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c)
230{
231 struct sprd_dma_chn *schan = to_sprd_dma_chan(c);
232
233 return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]);
234}
235
236static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd)
237{
238 return container_of(vd, struct sprd_dma_desc, vd);
239}
240
241static void sprd_dma_glb_update(struct sprd_dma_dev *sdev, u32 reg,
242 u32 mask, u32 val)
243{
244 u32 orig = readl(sdev->glb_base + reg);
245 u32 tmp;
246
247 tmp = (orig & ~mask) | val;
248 writel(tmp, sdev->glb_base + reg);
249}
250
251static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg,
252 u32 mask, u32 val)
253{
254 u32 orig = readl(schan->chn_base + reg);
255 u32 tmp;
256
257 tmp = (orig & ~mask) | val;
258 writel(tmp, schan->chn_base + reg);
259}
260
261static int sprd_dma_enable(struct sprd_dma_dev *sdev)
262{
263 int ret;
264
265 ret = clk_prepare_enable(sdev->clk);
266 if (ret)
267 return ret;
268
269 /*
270 * The ashb_clk is optional and only for AGCP DMA controller, so we
271 * need add one condition to check if the ashb_clk need enable.
272 */
273 if (!IS_ERR(sdev->ashb_clk))
274 ret = clk_prepare_enable(sdev->ashb_clk);
275
276 return ret;
277}
278
279static void sprd_dma_disable(struct sprd_dma_dev *sdev)
280{
281 clk_disable_unprepare(sdev->clk);
282
283 /*
284 * Need to check if we need disable the optional ashb_clk for AGCP DMA.
285 */
286 if (!IS_ERR(sdev->ashb_clk))
287 clk_disable_unprepare(sdev->ashb_clk);
288}
289
290static void sprd_dma_set_uid(struct sprd_dma_chn *schan)
291{
292 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
293 u32 dev_id = schan->dev_id;
294
295 if (dev_id != SPRD_DMA_SOFTWARE_UID) {
296 u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
297 SPRD_DMA_GLB_REQ_UID(dev_id);
298
299 writel(schan->chn_num + 1, sdev->glb_base + uid_offset);
300 }
301}
302
303static void sprd_dma_unset_uid(struct sprd_dma_chn *schan)
304{
305 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
306 u32 dev_id = schan->dev_id;
307
308 if (dev_id != SPRD_DMA_SOFTWARE_UID) {
309 u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
310 SPRD_DMA_GLB_REQ_UID(dev_id);
311
312 writel(0, sdev->glb_base + uid_offset);
313 }
314}
315
316static void sprd_dma_clear_int(struct sprd_dma_chn *schan)
317{
318 sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC,
319 SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET,
320 SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET);
321}
322
323static void sprd_dma_enable_chn(struct sprd_dma_chn *schan)
324{
325 sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN,
326 SPRD_DMA_CHN_EN);
327}
328
329static void sprd_dma_disable_chn(struct sprd_dma_chn *schan)
330{
331 sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0);
332}
333
334static void sprd_dma_soft_request(struct sprd_dma_chn *schan)
335{
336 sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN,
337 SPRD_DMA_REQ_EN);
338}
339
340static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable)
341{
342 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
343 u32 pause, timeout = SPRD_DMA_PAUSE_CNT;
344
345 if (enable) {
346 sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
347 SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN);
348
349 do {
350 pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE);
351 if (pause & SPRD_DMA_PAUSE_STS)
352 break;
353
354 cpu_relax();
355 } while (--timeout > 0);
356
357 if (!timeout)
358 dev_warn(sdev->dma_dev.dev,
359 "pause dma controller timeout\n");
360 } else {
361 sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
362 SPRD_DMA_PAUSE_EN, 0);
363 }
364}
365
366static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
367{
368 u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG);
369
370 if (!(cfg & SPRD_DMA_CHN_EN))
371 return;
372
373 sprd_dma_pause_resume(schan, true);
374 sprd_dma_disable_chn(schan);
375}
376
377static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan)
378{
379 unsigned long addr, addr_high;
380
381 addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
382 addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) &
383 SPRD_DMA_HIGH_ADDR_MASK;
384
385 return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
386}
387
388static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
389{
390 unsigned long addr, addr_high;
391
392 addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
393 addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) &
394 SPRD_DMA_HIGH_ADDR_MASK;
395
396 return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
397}
398
399static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan)
400{
401 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
402 u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) &
403 SPRD_DMA_CHN_INT_STS;
404
405 switch (intc_sts) {
406 case SPRD_DMA_CFGERR_INT_STS:
407 return SPRD_DMA_CFGERR_INT;
408
409 case SPRD_DMA_LIST_INT_STS:
410 return SPRD_DMA_LIST_INT;
411
412 case SPRD_DMA_TRSC_INT_STS:
413 return SPRD_DMA_TRANS_INT;
414
415 case SPRD_DMA_BLK_INT_STS:
416 return SPRD_DMA_BLK_INT;
417
418 case SPRD_DMA_FRAG_INT_STS:
419 return SPRD_DMA_FRAG_INT;
420
421 default:
422 dev_warn(sdev->dma_dev.dev, "incorrect dma interrupt type\n");
423 return SPRD_DMA_NO_INT;
424 }
425}
426
427static enum sprd_dma_req_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan)
428{
429 u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
430
431 return (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) & SPRD_DMA_REQ_MODE_MASK;
432}
433
434static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
435{
436 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
437 u32 val, chn = schan->chn_num + 1;
438
439 switch (schan->chn_mode) {
440 case SPRD_DMA_SRC_CHN0:
441 val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
442 val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
443 val |= SPRD_DMA_GLB_2STAGE_EN;
444 if (schan->int_type != SPRD_DMA_NO_INT)
445 val |= SPRD_DMA_GLB_SRC_INT;
446
447 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
448 break;
449
450 case SPRD_DMA_SRC_CHN1:
451 val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
452 val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
453 val |= SPRD_DMA_GLB_2STAGE_EN;
454 if (schan->int_type != SPRD_DMA_NO_INT)
455 val |= SPRD_DMA_GLB_SRC_INT;
456
457 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
458 break;
459
460 case SPRD_DMA_DST_CHN0:
461 val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
462 SPRD_DMA_GLB_DEST_CHN_MASK;
463 val |= SPRD_DMA_GLB_2STAGE_EN;
464 if (schan->int_type != SPRD_DMA_NO_INT)
465 val |= SPRD_DMA_GLB_DEST_INT;
466
467 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
468 break;
469
470 case SPRD_DMA_DST_CHN1:
471 val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
472 SPRD_DMA_GLB_DEST_CHN_MASK;
473 val |= SPRD_DMA_GLB_2STAGE_EN;
474 if (schan->int_type != SPRD_DMA_NO_INT)
475 val |= SPRD_DMA_GLB_DEST_INT;
476
477 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
478 break;
479
480 default:
481 dev_err(sdev->dma_dev.dev, "invalid channel mode setting %d\n",
482 schan->chn_mode);
483 return -EINVAL;
484 }
485
486 return 0;
487}
488
489static void sprd_dma_set_pending(struct sprd_dma_chn *schan, bool enable)
490{
491 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
492 u32 reg, val, req_id;
493
494 if (schan->dev_id == SPRD_DMA_SOFTWARE_UID)
495 return;
496
497 /* The DMA request id always starts from 0. */
498 req_id = schan->dev_id - 1;
499
500 if (req_id < 32) {
501 reg = SPRD_DMA_GLB_REQ_PEND0_EN;
502 val = BIT(req_id);
503 } else {
504 reg = SPRD_DMA_GLB_REQ_PEND1_EN;
505 val = BIT(req_id - 32);
506 }
507
508 sprd_dma_glb_update(sdev, reg, val, enable ? val : 0);
509}
510
511static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan,
512 struct sprd_dma_desc *sdesc)
513{
514 struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw;
515
516 writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE);
517 writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG);
518 writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC);
519 writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
520 writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
521 writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
522 writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN);
523 writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN);
524 writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP);
525 writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR);
526 writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO);
527 writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR);
528 writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP);
529 writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP);
530 writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP);
531 writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ);
532}
533
534static void sprd_dma_start(struct sprd_dma_chn *schan)
535{
536 struct virt_dma_desc *vd = vchan_next_desc(&schan->vc);
537
538 if (!vd)
539 return;
540
541 list_del(&vd->node);
542 schan->cur_desc = to_sprd_dma_desc(vd);
543
544 /*
545 * Set 2-stage configuration if the channel starts one 2-stage
546 * transfer.
547 */
548 if (schan->chn_mode && sprd_dma_set_2stage_config(schan))
549 return;
550
551 /*
552 * Copy the DMA configuration from DMA descriptor to this hardware
553 * channel.
554 */
555 sprd_dma_set_chn_config(schan, schan->cur_desc);
556 sprd_dma_set_uid(schan);
557 sprd_dma_set_pending(schan, true);
558 sprd_dma_enable_chn(schan);
559
560 if (schan->dev_id == SPRD_DMA_SOFTWARE_UID &&
561 schan->chn_mode != SPRD_DMA_DST_CHN0 &&
562 schan->chn_mode != SPRD_DMA_DST_CHN1)
563 sprd_dma_soft_request(schan);
564}
565
566static void sprd_dma_stop(struct sprd_dma_chn *schan)
567{
568 sprd_dma_stop_and_disable(schan);
569 sprd_dma_set_pending(schan, false);
570 sprd_dma_unset_uid(schan);
571 sprd_dma_clear_int(schan);
572 schan->cur_desc = NULL;
573}
574
575static bool sprd_dma_check_trans_done(enum sprd_dma_int_type int_type,
576 enum sprd_dma_req_mode req_mode)
577{
578 if (int_type == SPRD_DMA_NO_INT)
579 return false;
580
581 if (int_type >= req_mode + 1)
582 return true;
583 else
584 return false;
585}
586
587static irqreturn_t dma_irq_handle(int irq, void *dev_id)
588{
589 struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id;
590 u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS);
591 struct sprd_dma_chn *schan;
592 struct sprd_dma_desc *sdesc;
593 enum sprd_dma_req_mode req_type;
594 enum sprd_dma_int_type int_type;
595 bool trans_done = false, cyclic = false;
596 u32 i;
597
598 while (irq_status) {
599 i = __ffs(irq_status);
600 irq_status &= (irq_status - 1);
601 schan = &sdev->channels[i];
602
603 spin_lock(&schan->vc.lock);
604
605 sdesc = schan->cur_desc;
606 if (!sdesc) {
607 spin_unlock(&schan->vc.lock);
608 return IRQ_HANDLED;
609 }
610
611 int_type = sprd_dma_get_int_type(schan);
612 req_type = sprd_dma_get_req_type(schan);
613 sprd_dma_clear_int(schan);
614
615 /* cyclic mode schedule callback */
616 cyclic = schan->linklist.phy_addr ? true : false;
617 if (cyclic == true) {
618 vchan_cyclic_callback(&sdesc->vd);
619 } else {
620 /* Check if the dma request descriptor is done. */
621 trans_done = sprd_dma_check_trans_done(int_type, req_type);
622 if (trans_done == true) {
623 vchan_cookie_complete(&sdesc->vd);
624 schan->cur_desc = NULL;
625 sprd_dma_start(schan);
626 }
627 }
628 spin_unlock(&schan->vc.lock);
629 }
630
631 return IRQ_HANDLED;
632}
633
634static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
635{
636 return pm_runtime_get_sync(chan->device->dev);
637}
638
639static void sprd_dma_free_chan_resources(struct dma_chan *chan)
640{
641 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
642 struct virt_dma_desc *cur_vd = NULL;
643 unsigned long flags;
644
645 spin_lock_irqsave(&schan->vc.lock, flags);
646 if (schan->cur_desc)
647 cur_vd = &schan->cur_desc->vd;
648
649 sprd_dma_stop(schan);
650 spin_unlock_irqrestore(&schan->vc.lock, flags);
651
652 if (cur_vd)
653 sprd_dma_free_desc(cur_vd);
654
655 vchan_free_chan_resources(&schan->vc);
656 pm_runtime_put(chan->device->dev);
657}
658
659static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
660 dma_cookie_t cookie,
661 struct dma_tx_state *txstate)
662{
663 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
664 struct virt_dma_desc *vd;
665 unsigned long flags;
666 enum dma_status ret;
667 u32 pos;
668
669 ret = dma_cookie_status(chan, cookie, txstate);
670 if (ret == DMA_COMPLETE || !txstate)
671 return ret;
672
673 spin_lock_irqsave(&schan->vc.lock, flags);
674 vd = vchan_find_desc(&schan->vc, cookie);
675 if (vd) {
676 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
677 struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
678
679 if (hw->trsc_len > 0)
680 pos = hw->trsc_len;
681 else if (hw->blk_len > 0)
682 pos = hw->blk_len;
683 else if (hw->frg_len > 0)
684 pos = hw->frg_len;
685 else
686 pos = 0;
687 } else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
688 struct sprd_dma_desc *sdesc = schan->cur_desc;
689
690 if (sdesc->dir == DMA_DEV_TO_MEM)
691 pos = sprd_dma_get_dst_addr(schan);
692 else
693 pos = sprd_dma_get_src_addr(schan);
694 } else {
695 pos = 0;
696 }
697 spin_unlock_irqrestore(&schan->vc.lock, flags);
698
699 dma_set_residue(txstate, pos);
700 return ret;
701}
702
703static void sprd_dma_issue_pending(struct dma_chan *chan)
704{
705 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
706 unsigned long flags;
707
708 spin_lock_irqsave(&schan->vc.lock, flags);
709 if (vchan_issue_pending(&schan->vc) && !schan->cur_desc)
710 sprd_dma_start(schan);
711 spin_unlock_irqrestore(&schan->vc.lock, flags);
712}
713
714static int sprd_dma_get_datawidth(enum dma_slave_buswidth buswidth)
715{
716 switch (buswidth) {
717 case DMA_SLAVE_BUSWIDTH_1_BYTE:
718 case DMA_SLAVE_BUSWIDTH_2_BYTES:
719 case DMA_SLAVE_BUSWIDTH_4_BYTES:
720 case DMA_SLAVE_BUSWIDTH_8_BYTES:
721 return ffs(buswidth) - 1;
722
723 default:
724 return -EINVAL;
725 }
726}
727
728static int sprd_dma_get_step(enum dma_slave_buswidth buswidth)
729{
730 switch (buswidth) {
731 case DMA_SLAVE_BUSWIDTH_1_BYTE:
732 case DMA_SLAVE_BUSWIDTH_2_BYTES:
733 case DMA_SLAVE_BUSWIDTH_4_BYTES:
734 case DMA_SLAVE_BUSWIDTH_8_BYTES:
735 return buswidth;
736
737 default:
738 return -EINVAL;
739 }
740}
741
742static int sprd_dma_fill_desc(struct dma_chan *chan,
743 struct sprd_dma_chn_hw *hw,
744 unsigned int sglen, int sg_index,
745 dma_addr_t src, dma_addr_t dst, u32 len,
746 enum dma_transfer_direction dir,
747 unsigned long flags,
748 struct dma_slave_config *slave_cfg)
749{
750 struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
751 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
752 enum sprd_dma_chn_mode chn_mode = schan->chn_mode;
753 u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK;
754 u32 int_mode = flags & SPRD_DMA_INT_MASK;
755 int src_datawidth, dst_datawidth, src_step, dst_step;
756 u32 temp, fix_mode = 0, fix_en = 0;
757 phys_addr_t llist_ptr;
758
759 if (dir == DMA_MEM_TO_DEV) {
760 src_step = sprd_dma_get_step(slave_cfg->src_addr_width);
761 if (src_step < 0) {
762 dev_err(sdev->dma_dev.dev, "invalid source step\n");
763 return src_step;
764 }
765
766 /*
767 * For 2-stage transfer, destination channel step can not be 0,
768 * since destination device is AON IRAM.
769 */
770 if (chn_mode == SPRD_DMA_DST_CHN0 ||
771 chn_mode == SPRD_DMA_DST_CHN1)
772 dst_step = src_step;
773 else
774 dst_step = SPRD_DMA_NONE_STEP;
775 } else {
776 dst_step = sprd_dma_get_step(slave_cfg->dst_addr_width);
777 if (dst_step < 0) {
778 dev_err(sdev->dma_dev.dev, "invalid destination step\n");
779 return dst_step;
780 }
781 src_step = SPRD_DMA_NONE_STEP;
782 }
783
784 src_datawidth = sprd_dma_get_datawidth(slave_cfg->src_addr_width);
785 if (src_datawidth < 0) {
786 dev_err(sdev->dma_dev.dev, "invalid source datawidth\n");
787 return src_datawidth;
788 }
789
790 dst_datawidth = sprd_dma_get_datawidth(slave_cfg->dst_addr_width);
791 if (dst_datawidth < 0) {
792 dev_err(sdev->dma_dev.dev, "invalid destination datawidth\n");
793 return dst_datawidth;
794 }
795
796 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
797
798 /*
799 * wrap_ptr and wrap_to will save the high 4 bits source address and
800 * destination address.
801 */
802 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
803 hw->wrap_to = (dst >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
804 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
805 hw->des_addr = dst & SPRD_DMA_LOW_ADDR_MASK;
806
807 /*
808 * If the src step and dst step both are 0 or both are not 0, that means
809 * we can not enable the fix mode. If one is 0 and another one is not,
810 * we can enable the fix mode.
811 */
812 if ((src_step != 0 && dst_step != 0) || (src_step | dst_step) == 0) {
813 fix_en = 0;
814 } else {
815 fix_en = 1;
816 if (src_step)
817 fix_mode = 1;
818 else
819 fix_mode = 0;
820 }
821
822 hw->intc = int_mode | SPRD_DMA_CFG_ERR_INT_EN;
823
824 temp = src_datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
825 temp |= dst_datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
826 temp |= req_mode << SPRD_DMA_REQ_MODE_OFFSET;
827 temp |= fix_mode << SPRD_DMA_FIX_SEL_OFFSET;
828 temp |= fix_en << SPRD_DMA_FIX_EN_OFFSET;
829 temp |= schan->linklist.wrap_addr ?
830 SPRD_DMA_WRAP_EN | SPRD_DMA_WRAP_SEL_DEST : 0;
831 temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
832 hw->frg_len = temp;
833
834 hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
835 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
836
837 temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
838 temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
839 hw->trsf_step = temp;
840
841 /* link-list configuration */
842 if (schan->linklist.phy_addr) {
843 hw->cfg |= SPRD_DMA_LINKLIST_EN;
844
845 /* link-list index */
846 temp = sglen ? (sg_index + 1) % sglen : 0;
847
848 /* Next link-list configuration's physical address offset */
849 temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR;
850 /*
851 * Set the link-list pointer point to next link-list
852 * configuration's physical address.
853 */
854 llist_ptr = schan->linklist.phy_addr + temp;
855 hw->llist_ptr = lower_32_bits(llist_ptr);
856 hw->src_blk_step = (upper_32_bits(llist_ptr) << SPRD_DMA_LLIST_HIGH_SHIFT) &
857 SPRD_DMA_LLIST_HIGH_MASK;
858
859 if (schan->linklist.wrap_addr) {
860 hw->wrap_ptr |= schan->linklist.wrap_addr &
861 SPRD_DMA_WRAP_ADDR_MASK;
862 hw->wrap_to |= dst & SPRD_DMA_WRAP_ADDR_MASK;
863 }
864 } else {
865 hw->llist_ptr = 0;
866 hw->src_blk_step = 0;
867 }
868
869 hw->frg_step = 0;
870 hw->des_blk_step = 0;
871 return 0;
872}
873
874static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
875 unsigned int sglen, int sg_index,
876 dma_addr_t src, dma_addr_t dst, u32 len,
877 enum dma_transfer_direction dir,
878 unsigned long flags,
879 struct dma_slave_config *slave_cfg)
880{
881 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
882 struct sprd_dma_chn_hw *hw;
883
884 if (!schan->linklist.virt_addr)
885 return -EINVAL;
886
887 hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr +
888 sg_index * sizeof(*hw));
889
890 return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len,
891 dir, flags, slave_cfg);
892}
893
894static struct dma_async_tx_descriptor *
895sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
896 size_t len, unsigned long flags)
897{
898 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
899 struct sprd_dma_desc *sdesc;
900 struct sprd_dma_chn_hw *hw;
901 enum sprd_dma_datawidth datawidth;
902 u32 step, temp;
903
904 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
905 if (!sdesc)
906 return NULL;
907
908 hw = &sdesc->chn_hw;
909
910 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
911 hw->intc = SPRD_DMA_TRANS_INT | SPRD_DMA_CFG_ERR_INT_EN;
912 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
913 hw->des_addr = dest & SPRD_DMA_LOW_ADDR_MASK;
914 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) &
915 SPRD_DMA_HIGH_ADDR_MASK;
916 hw->wrap_to = (dest >> SPRD_DMA_HIGH_ADDR_OFFSET) &
917 SPRD_DMA_HIGH_ADDR_MASK;
918
919 if (IS_ALIGNED(len, 8)) {
920 datawidth = SPRD_DMA_DATAWIDTH_8_BYTES;
921 step = SPRD_DMA_DWORD_STEP;
922 } else if (IS_ALIGNED(len, 4)) {
923 datawidth = SPRD_DMA_DATAWIDTH_4_BYTES;
924 step = SPRD_DMA_WORD_STEP;
925 } else if (IS_ALIGNED(len, 2)) {
926 datawidth = SPRD_DMA_DATAWIDTH_2_BYTES;
927 step = SPRD_DMA_SHORT_STEP;
928 } else {
929 datawidth = SPRD_DMA_DATAWIDTH_1_BYTE;
930 step = SPRD_DMA_BYTE_STEP;
931 }
932
933 temp = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
934 temp |= datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
935 temp |= SPRD_DMA_TRANS_REQ << SPRD_DMA_REQ_MODE_OFFSET;
936 temp |= len & SPRD_DMA_FRG_LEN_MASK;
937 hw->frg_len = temp;
938
939 hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
940 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
941
942 temp = (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
943 temp |= (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
944 hw->trsf_step = temp;
945
946 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
947}
948
949static struct dma_async_tx_descriptor *
950sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
951 unsigned int sglen, enum dma_transfer_direction dir,
952 unsigned long flags, void *context)
953{
954 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
955 struct dma_slave_config *slave_cfg = &schan->slave_cfg;
956 dma_addr_t src = 0, dst = 0;
957 dma_addr_t start_src = 0, start_dst = 0;
958 struct sprd_dma_desc *sdesc;
959 struct scatterlist *sg;
960 u32 len = 0;
961 int ret, i;
962
963 if (!is_slave_direction(dir))
964 return NULL;
965
966 if (context) {
967 struct sprd_dma_linklist *ll_cfg =
968 (struct sprd_dma_linklist *)context;
969
970 schan->linklist.phy_addr = ll_cfg->phy_addr;
971 schan->linklist.virt_addr = ll_cfg->virt_addr;
972 schan->linklist.wrap_addr = ll_cfg->wrap_addr;
973 } else {
974 schan->linklist.phy_addr = 0;
975 schan->linklist.virt_addr = 0;
976 schan->linklist.wrap_addr = 0;
977 }
978
979 /*
980 * Set channel mode, interrupt mode and trigger mode for 2-stage
981 * transfer.
982 */
983 schan->chn_mode =
984 (flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK;
985 schan->trg_mode =
986 (flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK;
987 schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK;
988
989 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
990 if (!sdesc)
991 return NULL;
992
993 sdesc->dir = dir;
994
995 for_each_sg(sgl, sg, sglen, i) {
996 len = sg_dma_len(sg);
997
998 if (dir == DMA_MEM_TO_DEV) {
999 src = sg_dma_address(sg);
1000 dst = slave_cfg->dst_addr;
1001 } else {
1002 src = slave_cfg->src_addr;
1003 dst = sg_dma_address(sg);
1004 }
1005
1006 if (!i) {
1007 start_src = src;
1008 start_dst = dst;
1009 }
1010
1011 /*
1012 * The link-list mode needs at least 2 link-list
1013 * configurations. If there is only one sg, it doesn't
1014 * need to fill the link-list configuration.
1015 */
1016 if (sglen < 2)
1017 break;
1018
1019 ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len,
1020 dir, flags, slave_cfg);
1021 if (ret) {
1022 kfree(sdesc);
1023 return NULL;
1024 }
1025 }
1026
1027 ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src,
1028 start_dst, len, dir, flags, slave_cfg);
1029 if (ret) {
1030 kfree(sdesc);
1031 return NULL;
1032 }
1033
1034 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
1035}
1036
1037static int sprd_dma_slave_config(struct dma_chan *chan,
1038 struct dma_slave_config *config)
1039{
1040 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1041 struct dma_slave_config *slave_cfg = &schan->slave_cfg;
1042
1043 memcpy(slave_cfg, config, sizeof(*config));
1044 return 0;
1045}
1046
1047static int sprd_dma_pause(struct dma_chan *chan)
1048{
1049 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1050 unsigned long flags;
1051
1052 spin_lock_irqsave(&schan->vc.lock, flags);
1053 sprd_dma_pause_resume(schan, true);
1054 spin_unlock_irqrestore(&schan->vc.lock, flags);
1055
1056 return 0;
1057}
1058
1059static int sprd_dma_resume(struct dma_chan *chan)
1060{
1061 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1062 unsigned long flags;
1063
1064 spin_lock_irqsave(&schan->vc.lock, flags);
1065 sprd_dma_pause_resume(schan, false);
1066 spin_unlock_irqrestore(&schan->vc.lock, flags);
1067
1068 return 0;
1069}
1070
1071static int sprd_dma_terminate_all(struct dma_chan *chan)
1072{
1073 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1074 struct virt_dma_desc *cur_vd = NULL;
1075 unsigned long flags;
1076 LIST_HEAD(head);
1077
1078 spin_lock_irqsave(&schan->vc.lock, flags);
1079 if (schan->cur_desc)
1080 cur_vd = &schan->cur_desc->vd;
1081
1082 sprd_dma_stop(schan);
1083
1084 vchan_get_all_descriptors(&schan->vc, &head);
1085 spin_unlock_irqrestore(&schan->vc.lock, flags);
1086
1087 if (cur_vd)
1088 sprd_dma_free_desc(cur_vd);
1089
1090 vchan_dma_desc_free_list(&schan->vc, &head);
1091 return 0;
1092}
1093
1094static void sprd_dma_free_desc(struct virt_dma_desc *vd)
1095{
1096 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
1097
1098 kfree(sdesc);
1099}
1100
1101static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
1102{
1103 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1104 u32 slave_id = *(u32 *)param;
1105
1106 schan->dev_id = slave_id;
1107 return true;
1108}
1109
1110static int sprd_dma_probe(struct platform_device *pdev)
1111{
1112 struct device_node *np = pdev->dev.of_node;
1113 struct sprd_dma_dev *sdev;
1114 struct sprd_dma_chn *dma_chn;
1115 u32 chn_count;
1116 int ret, i;
1117
1118 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(36));
1119 if (ret) {
1120 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
1121 if (ret) {
1122 dev_err(&pdev->dev, "unable to set coherent mask to 32\n");
1123 return ret;
1124 }
1125 }
1126
1127 /* Parse new and deprecated dma-channels properties */
1128 ret = device_property_read_u32(&pdev->dev, "dma-channels", &chn_count);
1129 if (ret)
1130 ret = device_property_read_u32(&pdev->dev, "#dma-channels",
1131 &chn_count);
1132 if (ret) {
1133 dev_err(&pdev->dev, "get dma channels count failed\n");
1134 return ret;
1135 }
1136
1137 sdev = devm_kzalloc(&pdev->dev,
1138 struct_size(sdev, channels, chn_count),
1139 GFP_KERNEL);
1140 if (!sdev)
1141 return -ENOMEM;
1142
1143 sdev->clk = devm_clk_get(&pdev->dev, "enable");
1144 if (IS_ERR(sdev->clk)) {
1145 dev_err(&pdev->dev, "get enable clock failed\n");
1146 return PTR_ERR(sdev->clk);
1147 }
1148
1149 /* ashb clock is optional for AGCP DMA */
1150 sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb");
1151 if (IS_ERR(sdev->ashb_clk))
1152 dev_warn(&pdev->dev, "no optional ashb eb clock\n");
1153
1154 /*
1155 * We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
1156 * DMA controller, it can or do not request the irq, which will save
1157 * system power without resuming system by DMA interrupts if AGCP DMA
1158 * does not request the irq. Thus the DMA interrupts property should
1159 * be optional.
1160 */
1161 sdev->irq = platform_get_irq(pdev, 0);
1162 if (sdev->irq > 0) {
1163 ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle,
1164 0, "sprd_dma", (void *)sdev);
1165 if (ret < 0) {
1166 dev_err(&pdev->dev, "request dma irq failed\n");
1167 return ret;
1168 }
1169 } else {
1170 dev_warn(&pdev->dev, "no interrupts for the dma controller\n");
1171 }
1172
1173 sdev->glb_base = devm_platform_ioremap_resource(pdev, 0);
1174 if (IS_ERR(sdev->glb_base))
1175 return PTR_ERR(sdev->glb_base);
1176
1177 dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask);
1178 sdev->total_chns = chn_count;
1179 INIT_LIST_HEAD(&sdev->dma_dev.channels);
1180 INIT_LIST_HEAD(&sdev->dma_dev.global_node);
1181 sdev->dma_dev.dev = &pdev->dev;
1182 sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources;
1183 sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources;
1184 sdev->dma_dev.device_tx_status = sprd_dma_tx_status;
1185 sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending;
1186 sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy;
1187 sdev->dma_dev.device_prep_slave_sg = sprd_dma_prep_slave_sg;
1188 sdev->dma_dev.device_config = sprd_dma_slave_config;
1189 sdev->dma_dev.device_pause = sprd_dma_pause;
1190 sdev->dma_dev.device_resume = sprd_dma_resume;
1191 sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all;
1192
1193 for (i = 0; i < chn_count; i++) {
1194 dma_chn = &sdev->channels[i];
1195 dma_chn->chn_num = i;
1196 dma_chn->cur_desc = NULL;
1197 /* get each channel's registers base address. */
1198 dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET +
1199 SPRD_DMA_CHN_REG_LENGTH * i;
1200
1201 dma_chn->vc.desc_free = sprd_dma_free_desc;
1202 vchan_init(&dma_chn->vc, &sdev->dma_dev);
1203 }
1204
1205 platform_set_drvdata(pdev, sdev);
1206 ret = sprd_dma_enable(sdev);
1207 if (ret)
1208 return ret;
1209
1210 pm_runtime_set_active(&pdev->dev);
1211 pm_runtime_enable(&pdev->dev);
1212
1213 ret = pm_runtime_get_sync(&pdev->dev);
1214 if (ret < 0)
1215 goto err_rpm;
1216
1217 ret = dma_async_device_register(&sdev->dma_dev);
1218 if (ret < 0) {
1219 dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
1220 goto err_register;
1221 }
1222
1223 sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
1224 ret = of_dma_controller_register(np, of_dma_simple_xlate,
1225 &sprd_dma_info);
1226 if (ret)
1227 goto err_of_register;
1228
1229 pm_runtime_put(&pdev->dev);
1230 return 0;
1231
1232err_of_register:
1233 dma_async_device_unregister(&sdev->dma_dev);
1234err_register:
1235 pm_runtime_put_noidle(&pdev->dev);
1236 pm_runtime_disable(&pdev->dev);
1237err_rpm:
1238 sprd_dma_disable(sdev);
1239 return ret;
1240}
1241
1242static void sprd_dma_remove(struct platform_device *pdev)
1243{
1244 struct sprd_dma_dev *sdev = platform_get_drvdata(pdev);
1245 struct sprd_dma_chn *c, *cn;
1246
1247 pm_runtime_get_sync(&pdev->dev);
1248
1249 /* explicitly free the irq */
1250 if (sdev->irq > 0)
1251 devm_free_irq(&pdev->dev, sdev->irq, sdev);
1252
1253 list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels,
1254 vc.chan.device_node) {
1255 list_del(&c->vc.chan.device_node);
1256 tasklet_kill(&c->vc.task);
1257 }
1258
1259 of_dma_controller_free(pdev->dev.of_node);
1260 dma_async_device_unregister(&sdev->dma_dev);
1261 sprd_dma_disable(sdev);
1262
1263 pm_runtime_put_noidle(&pdev->dev);
1264 pm_runtime_disable(&pdev->dev);
1265}
1266
1267static const struct of_device_id sprd_dma_match[] = {
1268 { .compatible = "sprd,sc9860-dma", },
1269 {},
1270};
1271MODULE_DEVICE_TABLE(of, sprd_dma_match);
1272
1273static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev)
1274{
1275 struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
1276
1277 sprd_dma_disable(sdev);
1278 return 0;
1279}
1280
1281static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
1282{
1283 struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
1284 int ret;
1285
1286 ret = sprd_dma_enable(sdev);
1287 if (ret)
1288 dev_err(sdev->dma_dev.dev, "enable dma failed\n");
1289
1290 return ret;
1291}
1292
1293static const struct dev_pm_ops sprd_dma_pm_ops = {
1294 SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
1295 sprd_dma_runtime_resume,
1296 NULL)
1297};
1298
1299static struct platform_driver sprd_dma_driver = {
1300 .probe = sprd_dma_probe,
1301 .remove_new = sprd_dma_remove,
1302 .driver = {
1303 .name = "sprd-dma",
1304 .of_match_table = sprd_dma_match,
1305 .pm = &sprd_dma_pm_ops,
1306 },
1307};
1308module_platform_driver(sprd_dma_driver);
1309
1310MODULE_LICENSE("GPL v2");
1311MODULE_DESCRIPTION("DMA driver for Spreadtrum");
1312MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
1313MODULE_AUTHOR("Eric Long <eric.long@spreadtrum.com>");
1314MODULE_ALIAS("platform:sprd-dma");