?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / dma / sprd-dma.c
blob9a31a315dbefb077a413dfc40906a198e5c0acff
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/of_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 */
159 enum 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 */
167 struct 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 */
187 struct 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 */
194 struct 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 */
208 struct 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[0];
216 };
217
218 static void sprd_dma_free_desc(struct virt_dma_desc *vd);
219 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
220 static struct of_dma_filter_info sprd_dma_info = {
221 .filter_fn = sprd_dma_filter_fn,
222 };
223
224 static 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
229 static 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
236 static 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
241 static 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
251 static 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
261 static 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
279 static 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
290 static 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
303 static 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
316 static 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
323 static 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
329 static 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
334 static 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
340 static 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
366 static 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
377 static 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
388 static 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
399 static 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
427 static 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
434 static 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
489 static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan,
490 struct sprd_dma_desc *sdesc)
491 {
492 struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw;
493
494 writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE);
495 writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG);
496 writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC);
497 writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
498 writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
499 writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
500 writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN);
501 writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN);
502 writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP);
503 writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR);
504 writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO);
505 writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR);
506 writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP);
507 writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP);
508 writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP);
509 writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ);
510 }
511
512 static void sprd_dma_start(struct sprd_dma_chn *schan)
513 {
514 struct virt_dma_desc *vd = vchan_next_desc(&schan->vc);
515
516 if (!vd)
517 return;
518
519 list_del(&vd->node);
520 schan->cur_desc = to_sprd_dma_desc(vd);
521
522 /*
523 * Set 2-stage configuration if the channel starts one 2-stage
524 * transfer.
525 */
526 if (schan->chn_mode && sprd_dma_set_2stage_config(schan))
527 return;
528
529 /*
530 * Copy the DMA configuration from DMA descriptor to this hardware
531 * channel.
532 */
533 sprd_dma_set_chn_config(schan, schan->cur_desc);
534 sprd_dma_set_uid(schan);
535 sprd_dma_enable_chn(schan);
536
537 if (schan->dev_id == SPRD_DMA_SOFTWARE_UID &&
538 schan->chn_mode != SPRD_DMA_DST_CHN0 &&
539 schan->chn_mode != SPRD_DMA_DST_CHN1)
540 sprd_dma_soft_request(schan);
541 }
542
543 static void sprd_dma_stop(struct sprd_dma_chn *schan)
544 {
545 sprd_dma_stop_and_disable(schan);
546 sprd_dma_unset_uid(schan);
547 sprd_dma_clear_int(schan);
548 schan->cur_desc = NULL;
549 }
550
551 static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc,
552 enum sprd_dma_int_type int_type,
553 enum sprd_dma_req_mode req_mode)
554 {
555 if (int_type == SPRD_DMA_NO_INT)
556 return false;
557
558 if (int_type >= req_mode + 1)
559 return true;
560 else
561 return false;
562 }
563
564 static irqreturn_t dma_irq_handle(int irq, void *dev_id)
565 {
566 struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id;
567 u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS);
568 struct sprd_dma_chn *schan;
569 struct sprd_dma_desc *sdesc;
570 enum sprd_dma_req_mode req_type;
571 enum sprd_dma_int_type int_type;
572 bool trans_done = false, cyclic = false;
573 u32 i;
574
575 while (irq_status) {
576 i = __ffs(irq_status);
577 irq_status &= (irq_status - 1);
578 schan = &sdev->channels[i];
579
580 spin_lock(&schan->vc.lock);
581
582 sdesc = schan->cur_desc;
583 if (!sdesc) {
584 spin_unlock(&schan->vc.lock);
585 return IRQ_HANDLED;
586 }
587
588 int_type = sprd_dma_get_int_type(schan);
589 req_type = sprd_dma_get_req_type(schan);
590 sprd_dma_clear_int(schan);
591
592 /* cyclic mode schedule callback */
593 cyclic = schan->linklist.phy_addr ? true : false;
594 if (cyclic == true) {
595 vchan_cyclic_callback(&sdesc->vd);
596 } else {
597 /* Check if the dma request descriptor is done. */
598 trans_done = sprd_dma_check_trans_done(sdesc, int_type,
599 req_type);
600 if (trans_done == true) {
601 vchan_cookie_complete(&sdesc->vd);
602 schan->cur_desc = NULL;
603 sprd_dma_start(schan);
604 }
605 }
606 spin_unlock(&schan->vc.lock);
607 }
608
609 return IRQ_HANDLED;
610 }
611
612 static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
613 {
614 return pm_runtime_get_sync(chan->device->dev);
615 }
616
617 static void sprd_dma_free_chan_resources(struct dma_chan *chan)
618 {
619 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
620 struct virt_dma_desc *cur_vd = NULL;
621 unsigned long flags;
622
623 spin_lock_irqsave(&schan->vc.lock, flags);
624 if (schan->cur_desc)
625 cur_vd = &schan->cur_desc->vd;
626
627 sprd_dma_stop(schan);
628 spin_unlock_irqrestore(&schan->vc.lock, flags);
629
630 if (cur_vd)
631 sprd_dma_free_desc(cur_vd);
632
633 vchan_free_chan_resources(&schan->vc);
634 pm_runtime_put(chan->device->dev);
635 }
636
637 static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
638 dma_cookie_t cookie,
639 struct dma_tx_state *txstate)
640 {
641 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
642 struct virt_dma_desc *vd;
643 unsigned long flags;
644 enum dma_status ret;
645 u32 pos;
646
647 ret = dma_cookie_status(chan, cookie, txstate);
648 if (ret == DMA_COMPLETE || !txstate)
649 return ret;
650
651 spin_lock_irqsave(&schan->vc.lock, flags);
652 vd = vchan_find_desc(&schan->vc, cookie);
653 if (vd) {
654 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
655 struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
656
657 if (hw->trsc_len > 0)
658 pos = hw->trsc_len;
659 else if (hw->blk_len > 0)
660 pos = hw->blk_len;
661 else if (hw->frg_len > 0)
662 pos = hw->frg_len;
663 else
664 pos = 0;
665 } else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
666 struct sprd_dma_desc *sdesc = schan->cur_desc;
667
668 if (sdesc->dir == DMA_DEV_TO_MEM)
669 pos = sprd_dma_get_dst_addr(schan);
670 else
671 pos = sprd_dma_get_src_addr(schan);
672 } else {
673 pos = 0;
674 }
675 spin_unlock_irqrestore(&schan->vc.lock, flags);
676
677 dma_set_residue(txstate, pos);
678 return ret;
679 }
680
681 static void sprd_dma_issue_pending(struct dma_chan *chan)
682 {
683 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
684 unsigned long flags;
685
686 spin_lock_irqsave(&schan->vc.lock, flags);
687 if (vchan_issue_pending(&schan->vc) && !schan->cur_desc)
688 sprd_dma_start(schan);
689 spin_unlock_irqrestore(&schan->vc.lock, flags);
690 }
691
692 static int sprd_dma_get_datawidth(enum dma_slave_buswidth buswidth)
693 {
694 switch (buswidth) {
695 case DMA_SLAVE_BUSWIDTH_1_BYTE:
696 case DMA_SLAVE_BUSWIDTH_2_BYTES:
697 case DMA_SLAVE_BUSWIDTH_4_BYTES:
698 case DMA_SLAVE_BUSWIDTH_8_BYTES:
699 return ffs(buswidth) - 1;
700
701 default:
702 return -EINVAL;
703 }
704 }
705
706 static int sprd_dma_get_step(enum dma_slave_buswidth buswidth)
707 {
708 switch (buswidth) {
709 case DMA_SLAVE_BUSWIDTH_1_BYTE:
710 case DMA_SLAVE_BUSWIDTH_2_BYTES:
711 case DMA_SLAVE_BUSWIDTH_4_BYTES:
712 case DMA_SLAVE_BUSWIDTH_8_BYTES:
713 return buswidth;
714
715 default:
716 return -EINVAL;
717 }
718 }
719
720 static int sprd_dma_fill_desc(struct dma_chan *chan,
721 struct sprd_dma_chn_hw *hw,
722 unsigned int sglen, int sg_index,
723 dma_addr_t src, dma_addr_t dst, u32 len,
724 enum dma_transfer_direction dir,
725 unsigned long flags,
726 struct dma_slave_config *slave_cfg)
727 {
728 struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
729 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
730 enum sprd_dma_chn_mode chn_mode = schan->chn_mode;
731 u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK;
732 u32 int_mode = flags & SPRD_DMA_INT_MASK;
733 int src_datawidth, dst_datawidth, src_step, dst_step;
734 u32 temp, fix_mode = 0, fix_en = 0;
735 phys_addr_t llist_ptr;
736
737 if (dir == DMA_MEM_TO_DEV) {
738 src_step = sprd_dma_get_step(slave_cfg->src_addr_width);
739 if (src_step < 0) {
740 dev_err(sdev->dma_dev.dev, "invalid source step\n");
741 return src_step;
742 }
743
744 /*
745 * For 2-stage transfer, destination channel step can not be 0,
746 * since destination device is AON IRAM.
747 */
748 if (chn_mode == SPRD_DMA_DST_CHN0 ||
749 chn_mode == SPRD_DMA_DST_CHN1)
750 dst_step = src_step;
751 else
752 dst_step = SPRD_DMA_NONE_STEP;
753 } else {
754 dst_step = sprd_dma_get_step(slave_cfg->dst_addr_width);
755 if (dst_step < 0) {
756 dev_err(sdev->dma_dev.dev, "invalid destination step\n");
757 return dst_step;
758 }
759 src_step = SPRD_DMA_NONE_STEP;
760 }
761
762 src_datawidth = sprd_dma_get_datawidth(slave_cfg->src_addr_width);
763 if (src_datawidth < 0) {
764 dev_err(sdev->dma_dev.dev, "invalid source datawidth\n");
765 return src_datawidth;
766 }
767
768 dst_datawidth = sprd_dma_get_datawidth(slave_cfg->dst_addr_width);
769 if (dst_datawidth < 0) {
770 dev_err(sdev->dma_dev.dev, "invalid destination datawidth\n");
771 return dst_datawidth;
772 }
773
774 if (slave_cfg->slave_id)
775 schan->dev_id = slave_cfg->slave_id;
776
777 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
778
779 /*
780 * wrap_ptr and wrap_to will save the high 4 bits source address and
781 * destination address.
782 */
783 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
784 hw->wrap_to = (dst >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
785 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
786 hw->des_addr = dst & SPRD_DMA_LOW_ADDR_MASK;
787
788 /*
789 * If the src step and dst step both are 0 or both are not 0, that means
790 * we can not enable the fix mode. If one is 0 and another one is not,
791 * we can enable the fix mode.
792 */
793 if ((src_step != 0 && dst_step != 0) || (src_step | dst_step) == 0) {
794 fix_en = 0;
795 } else {
796 fix_en = 1;
797 if (src_step)
798 fix_mode = 1;
799 else
800 fix_mode = 0;
801 }
802
803 hw->intc = int_mode | SPRD_DMA_CFG_ERR_INT_EN;
804
805 temp = src_datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
806 temp |= dst_datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
807 temp |= req_mode << SPRD_DMA_REQ_MODE_OFFSET;
808 temp |= fix_mode << SPRD_DMA_FIX_SEL_OFFSET;
809 temp |= fix_en << SPRD_DMA_FIX_EN_OFFSET;
810 temp |= schan->linklist.wrap_addr ?
811 SPRD_DMA_WRAP_EN | SPRD_DMA_WRAP_SEL_DEST : 0;
812 temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
813 hw->frg_len = temp;
814
815 hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
816 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
817
818 temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
819 temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
820 hw->trsf_step = temp;
821
822 /* link-list configuration */
823 if (schan->linklist.phy_addr) {
824 hw->cfg |= SPRD_DMA_LINKLIST_EN;
825
826 /* link-list index */
827 temp = sglen ? (sg_index + 1) % sglen : 0;
828
829 /* Next link-list configuration's physical address offset */
830 temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR;
831 /*
832 * Set the link-list pointer point to next link-list
833 * configuration's physical address.
834 */
835 llist_ptr = schan->linklist.phy_addr + temp;
836 hw->llist_ptr = lower_32_bits(llist_ptr);
837 hw->src_blk_step = (upper_32_bits(llist_ptr) << SPRD_DMA_LLIST_HIGH_SHIFT) &
838 SPRD_DMA_LLIST_HIGH_MASK;
839
840 if (schan->linklist.wrap_addr) {
841 hw->wrap_ptr |= schan->linklist.wrap_addr &
842 SPRD_DMA_WRAP_ADDR_MASK;
843 hw->wrap_to |= dst & SPRD_DMA_WRAP_ADDR_MASK;
844 }
845 } else {
846 hw->llist_ptr = 0;
847 hw->src_blk_step = 0;
848 }
849
850 hw->frg_step = 0;
851 hw->des_blk_step = 0;
852 return 0;
853 }
854
855 static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
856 unsigned int sglen, int sg_index,
857 dma_addr_t src, dma_addr_t dst, u32 len,
858 enum dma_transfer_direction dir,
859 unsigned long flags,
860 struct dma_slave_config *slave_cfg)
861 {
862 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
863 struct sprd_dma_chn_hw *hw;
864
865 if (!schan->linklist.virt_addr)
866 return -EINVAL;
867
868 hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr +
869 sg_index * sizeof(*hw));
870
871 return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len,
872 dir, flags, slave_cfg);
873 }
874
875 static struct dma_async_tx_descriptor *
876 sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
877 size_t len, unsigned long flags)
878 {
879 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
880 struct sprd_dma_desc *sdesc;
881 struct sprd_dma_chn_hw *hw;
882 enum sprd_dma_datawidth datawidth;
883 u32 step, temp;
884
885 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
886 if (!sdesc)
887 return NULL;
888
889 hw = &sdesc->chn_hw;
890
891 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
892 hw->intc = SPRD_DMA_TRANS_INT | SPRD_DMA_CFG_ERR_INT_EN;
893 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
894 hw->des_addr = dest & SPRD_DMA_LOW_ADDR_MASK;
895 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) &
896 SPRD_DMA_HIGH_ADDR_MASK;
897 hw->wrap_to = (dest >> SPRD_DMA_HIGH_ADDR_OFFSET) &
898 SPRD_DMA_HIGH_ADDR_MASK;
899
900 if (IS_ALIGNED(len, 8)) {
901 datawidth = SPRD_DMA_DATAWIDTH_8_BYTES;
902 step = SPRD_DMA_DWORD_STEP;
903 } else if (IS_ALIGNED(len, 4)) {
904 datawidth = SPRD_DMA_DATAWIDTH_4_BYTES;
905 step = SPRD_DMA_WORD_STEP;
906 } else if (IS_ALIGNED(len, 2)) {
907 datawidth = SPRD_DMA_DATAWIDTH_2_BYTES;
908 step = SPRD_DMA_SHORT_STEP;
909 } else {
910 datawidth = SPRD_DMA_DATAWIDTH_1_BYTE;
911 step = SPRD_DMA_BYTE_STEP;
912 }
913
914 temp = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
915 temp |= datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
916 temp |= SPRD_DMA_TRANS_REQ << SPRD_DMA_REQ_MODE_OFFSET;
917 temp |= len & SPRD_DMA_FRG_LEN_MASK;
918 hw->frg_len = temp;
919
920 hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
921 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
922
923 temp = (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
924 temp |= (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
925 hw->trsf_step = temp;
926
927 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
928 }
929
930 static struct dma_async_tx_descriptor *
931 sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
932 unsigned int sglen, enum dma_transfer_direction dir,
933 unsigned long flags, void *context)
934 {
935 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
936 struct dma_slave_config *slave_cfg = &schan->slave_cfg;
937 dma_addr_t src = 0, dst = 0;
938 dma_addr_t start_src = 0, start_dst = 0;
939 struct sprd_dma_desc *sdesc;
940 struct scatterlist *sg;
941 u32 len = 0;
942 int ret, i;
943
944 if (!is_slave_direction(dir))
945 return NULL;
946
947 if (context) {
948 struct sprd_dma_linklist *ll_cfg =
949 (struct sprd_dma_linklist *)context;
950
951 schan->linklist.phy_addr = ll_cfg->phy_addr;
952 schan->linklist.virt_addr = ll_cfg->virt_addr;
953 schan->linklist.wrap_addr = ll_cfg->wrap_addr;
954 } else {
955 schan->linklist.phy_addr = 0;
956 schan->linklist.virt_addr = 0;
957 schan->linklist.wrap_addr = 0;
958 }
959
960 /*
961 * Set channel mode, interrupt mode and trigger mode for 2-stage
962 * transfer.
963 */
964 schan->chn_mode =
965 (flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK;
966 schan->trg_mode =
967 (flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK;
968 schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK;
969
970 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
971 if (!sdesc)
972 return NULL;
973
974 sdesc->dir = dir;
975
976 for_each_sg(sgl, sg, sglen, i) {
977 len = sg_dma_len(sg);
978
979 if (dir == DMA_MEM_TO_DEV) {
980 src = sg_dma_address(sg);
981 dst = slave_cfg->dst_addr;
982 } else {
983 src = slave_cfg->src_addr;
984 dst = sg_dma_address(sg);
985 }
986
987 if (!i) {
988 start_src = src;
989 start_dst = dst;
990 }
991
992 /*
993 * The link-list mode needs at least 2 link-list
994 * configurations. If there is only one sg, it doesn't
995 * need to fill the link-list configuration.
996 */
997 if (sglen < 2)
998 break;
999
1000 ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len,
1001 dir, flags, slave_cfg);
1002 if (ret) {
1003 kfree(sdesc);
1004 return NULL;
1005 }
1006 }
1007
1008 ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src,
1009 start_dst, len, dir, flags, slave_cfg);
1010 if (ret) {
1011 kfree(sdesc);
1012 return NULL;
1013 }
1014
1015 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
1016 }
1017
1018 static int sprd_dma_slave_config(struct dma_chan *chan,
1019 struct dma_slave_config *config)
1020 {
1021 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1022 struct dma_slave_config *slave_cfg = &schan->slave_cfg;
1023
1024 memcpy(slave_cfg, config, sizeof(*config));
1025 return 0;
1026 }
1027
1028 static int sprd_dma_pause(struct dma_chan *chan)
1029 {
1030 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1031 unsigned long flags;
1032
1033 spin_lock_irqsave(&schan->vc.lock, flags);
1034 sprd_dma_pause_resume(schan, true);
1035 spin_unlock_irqrestore(&schan->vc.lock, flags);
1036
1037 return 0;
1038 }
1039
1040 static int sprd_dma_resume(struct dma_chan *chan)
1041 {
1042 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1043 unsigned long flags;
1044
1045 spin_lock_irqsave(&schan->vc.lock, flags);
1046 sprd_dma_pause_resume(schan, false);
1047 spin_unlock_irqrestore(&schan->vc.lock, flags);
1048
1049 return 0;
1050 }
1051
1052 static int sprd_dma_terminate_all(struct dma_chan *chan)
1053 {
1054 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1055 struct virt_dma_desc *cur_vd = NULL;
1056 unsigned long flags;
1057 LIST_HEAD(head);
1058
1059 spin_lock_irqsave(&schan->vc.lock, flags);
1060 if (schan->cur_desc)
1061 cur_vd = &schan->cur_desc->vd;
1062
1063 sprd_dma_stop(schan);
1064
1065 vchan_get_all_descriptors(&schan->vc, &head);
1066 spin_unlock_irqrestore(&schan->vc.lock, flags);
1067
1068 if (cur_vd)
1069 sprd_dma_free_desc(cur_vd);
1070
1071 vchan_dma_desc_free_list(&schan->vc, &head);
1072 return 0;
1073 }
1074
1075 static void sprd_dma_free_desc(struct virt_dma_desc *vd)
1076 {
1077 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
1078
1079 kfree(sdesc);
1080 }
1081
1082 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
1083 {
1084 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
1085 u32 slave_id = *(u32 *)param;
1086
1087 schan->dev_id = slave_id;
1088 return true;
1089 }
1090
1091 static int sprd_dma_probe(struct platform_device *pdev)
1092 {
1093 struct device_node *np = pdev->dev.of_node;
1094 struct sprd_dma_dev *sdev;
1095 struct sprd_dma_chn *dma_chn;
1096 u32 chn_count;
1097 int ret, i;
1098
1099 ret = device_property_read_u32(&pdev->dev, "#dma-channels", &chn_count);
1100 if (ret) {
1101 dev_err(&pdev->dev, "get dma channels count failed\n");
1102 return ret;
1103 }
1104
1105 sdev = devm_kzalloc(&pdev->dev,
1106 struct_size(sdev, channels, chn_count),
1107 GFP_KERNEL);
1108 if (!sdev)
1109 return -ENOMEM;
1110
1111 sdev->clk = devm_clk_get(&pdev->dev, "enable");
1112 if (IS_ERR(sdev->clk)) {
1113 dev_err(&pdev->dev, "get enable clock failed\n");
1114 return PTR_ERR(sdev->clk);
1115 }
1116
1117 /* ashb clock is optional for AGCP DMA */
1118 sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb");
1119 if (IS_ERR(sdev->ashb_clk))
1120 dev_warn(&pdev->dev, "no optional ashb eb clock\n");
1121
1122 /*
1123 * We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
1124 * DMA controller, it can or do not request the irq, which will save
1125 * system power without resuming system by DMA interrupts if AGCP DMA
1126 * does not request the irq. Thus the DMA interrupts property should
1127 * be optional.
1128 */
1129 sdev->irq = platform_get_irq(pdev, 0);
1130 if (sdev->irq > 0) {
1131 ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle,
1132 0, "sprd_dma", (void *)sdev);
1133 if (ret < 0) {
1134 dev_err(&pdev->dev, "request dma irq failed\n");
1135 return ret;
1136 }
1137 } else {
1138 dev_warn(&pdev->dev, "no interrupts for the dma controller\n");
1139 }
1140
1141 sdev->glb_base = devm_platform_ioremap_resource(pdev, 0);
1142 if (IS_ERR(sdev->glb_base))
1143 return PTR_ERR(sdev->glb_base);
1144
1145 dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask);
1146 sdev->total_chns = chn_count;
1147 sdev->dma_dev.chancnt = chn_count;
1148 INIT_LIST_HEAD(&sdev->dma_dev.channels);
1149 INIT_LIST_HEAD(&sdev->dma_dev.global_node);
1150 sdev->dma_dev.dev = &pdev->dev;
1151 sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources;
1152 sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources;
1153 sdev->dma_dev.device_tx_status = sprd_dma_tx_status;
1154 sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending;
1155 sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy;
1156 sdev->dma_dev.device_prep_slave_sg = sprd_dma_prep_slave_sg;
1157 sdev->dma_dev.device_config = sprd_dma_slave_config;
1158 sdev->dma_dev.device_pause = sprd_dma_pause;
1159 sdev->dma_dev.device_resume = sprd_dma_resume;
1160 sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all;
1161
1162 for (i = 0; i < chn_count; i++) {
1163 dma_chn = &sdev->channels[i];
1164 dma_chn->chn_num = i;
1165 dma_chn->cur_desc = NULL;
1166 /* get each channel's registers base address. */
1167 dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET +
1168 SPRD_DMA_CHN_REG_LENGTH * i;
1169
1170 dma_chn->vc.desc_free = sprd_dma_free_desc;
1171 vchan_init(&dma_chn->vc, &sdev->dma_dev);
1172 }
1173
1174 platform_set_drvdata(pdev, sdev);
1175 ret = sprd_dma_enable(sdev);
1176 if (ret)
1177 return ret;
1178
1179 pm_runtime_set_active(&pdev->dev);
1180 pm_runtime_enable(&pdev->dev);
1181
1182 ret = pm_runtime_get_sync(&pdev->dev);
1183 if (ret < 0)
1184 goto err_rpm;
1185
1186 ret = dma_async_device_register(&sdev->dma_dev);
1187 if (ret < 0) {
1188 dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
1189 goto err_register;
1190 }
1191
1192 sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
1193 ret = of_dma_controller_register(np, of_dma_simple_xlate,
1194 &sprd_dma_info);
1195 if (ret)
1196 goto err_of_register;
1197
1198 pm_runtime_put(&pdev->dev);
1199 return 0;
1200
1201 err_of_register:
1202 dma_async_device_unregister(&sdev->dma_dev);
1203 err_register:
1204 pm_runtime_put_noidle(&pdev->dev);
1205 pm_runtime_disable(&pdev->dev);
1206 err_rpm:
1207 sprd_dma_disable(sdev);
1208 return ret;
1209 }
1210
1211 static int sprd_dma_remove(struct platform_device *pdev)
1212 {
1213 struct sprd_dma_dev *sdev = platform_get_drvdata(pdev);
1214 struct sprd_dma_chn *c, *cn;
1215 int ret;
1216
1217 ret = pm_runtime_get_sync(&pdev->dev);
1218 if (ret < 0)
1219 return ret;
1220
1221 /* explicitly free the irq */
1222 if (sdev->irq > 0)
1223 devm_free_irq(&pdev->dev, sdev->irq, sdev);
1224
1225 list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels,
1226 vc.chan.device_node) {
1227 list_del(&c->vc.chan.device_node);
1228 tasklet_kill(&c->vc.task);
1229 }
1230
1231 of_dma_controller_free(pdev->dev.of_node);
1232 dma_async_device_unregister(&sdev->dma_dev);
1233 sprd_dma_disable(sdev);
1234
1235 pm_runtime_put_noidle(&pdev->dev);
1236 pm_runtime_disable(&pdev->dev);
1237 return 0;
1238 }
1239
1240 static const struct of_device_id sprd_dma_match[] = {
1241 { .compatible = "sprd,sc9860-dma", },
1242 {},
1243 };
1244
1245 static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev)
1246 {
1247 struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
1248
1249 sprd_dma_disable(sdev);
1250 return 0;
1251 }
1252
1253 static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
1254 {
1255 struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
1256 int ret;
1257
1258 ret = sprd_dma_enable(sdev);
1259 if (ret)
1260 dev_err(sdev->dma_dev.dev, "enable dma failed\n");
1261
1262 return ret;
1263 }
1264
1265 static const struct dev_pm_ops sprd_dma_pm_ops = {
1266 SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
1267 sprd_dma_runtime_resume,
1268 NULL)
1269 };
1270
1271 static struct platform_driver sprd_dma_driver = {
1272 .probe = sprd_dma_probe,
1273 .remove = sprd_dma_remove,
1274 .driver = {
1275 .name = "sprd-dma",
1276 .of_match_table = sprd_dma_match,
1277 .pm = &sprd_dma_pm_ops,
1278 },
1279 };
1280 module_platform_driver(sprd_dma_driver);
1281
1282 MODULE_LICENSE("GPL v2");
1283 MODULE_DESCRIPTION("DMA driver for Spreadtrum");
1284 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
1285 MODULE_AUTHOR("Eric Long <eric.long@spreadtrum.com>");
1286 MODULE_ALIAS("platform:sprd-dma");
Linux with added FPC-III support