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