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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
4 * Author: Sugar <shuge@allwinnertech.com>
5 *
6 * Copyright (C) 2014 Maxime Ripard
7 * Maxime Ripard <maxime.ripard@free-electrons.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/dma-mapping.h>
13#include <linux/dmaengine.h>
14#include <linux/dmapool.h>
15#include <linux/interrupt.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_dma.h>
19#include <linux/platform_device.h>
20#include <linux/reset.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23
24#include "virt-dma.h"
25
26/*
27 * Common registers
28 */
29#define DMA_IRQ_EN(x) ((x) * 0x04)
30#define DMA_IRQ_HALF BIT(0)
31#define DMA_IRQ_PKG BIT(1)
32#define DMA_IRQ_QUEUE BIT(2)
33
34#define DMA_IRQ_CHAN_NR 8
35#define DMA_IRQ_CHAN_WIDTH 4
36
37
38#define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10)
39
40#define DMA_STAT 0x30
41
42/* Offset between DMA_IRQ_EN and DMA_IRQ_STAT limits number of channels */
43#define DMA_MAX_CHANNELS (DMA_IRQ_CHAN_NR * 0x10 / 4)
44
45/*
46 * sun8i specific registers
47 */
48#define SUN8I_DMA_GATE 0x20
49#define SUN8I_DMA_GATE_ENABLE 0x4
50
51#define SUNXI_H3_SECURE_REG 0x20
52#define SUNXI_H3_DMA_GATE 0x28
53#define SUNXI_H3_DMA_GATE_ENABLE 0x4
54/*
55 * Channels specific registers
56 */
57#define DMA_CHAN_ENABLE 0x00
58#define DMA_CHAN_ENABLE_START BIT(0)
59#define DMA_CHAN_ENABLE_STOP 0
60
61#define DMA_CHAN_PAUSE 0x04
62#define DMA_CHAN_PAUSE_PAUSE BIT(1)
63#define DMA_CHAN_PAUSE_RESUME 0
64
65#define DMA_CHAN_LLI_ADDR 0x08
66
67#define DMA_CHAN_CUR_CFG 0x0c
68#define DMA_CHAN_MAX_DRQ_A31 0x1f
69#define DMA_CHAN_MAX_DRQ_H6 0x3f
70#define DMA_CHAN_CFG_SRC_DRQ_A31(x) ((x) & DMA_CHAN_MAX_DRQ_A31)
71#define DMA_CHAN_CFG_SRC_DRQ_H6(x) ((x) & DMA_CHAN_MAX_DRQ_H6)
72#define DMA_CHAN_CFG_SRC_MODE_A31(x) (((x) & 0x1) << 5)
73#define DMA_CHAN_CFG_SRC_MODE_H6(x) (((x) & 0x1) << 8)
74#define DMA_CHAN_CFG_SRC_BURST_A31(x) (((x) & 0x3) << 7)
75#define DMA_CHAN_CFG_SRC_BURST_H3(x) (((x) & 0x3) << 6)
76#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
77
78#define DMA_CHAN_CFG_DST_DRQ_A31(x) (DMA_CHAN_CFG_SRC_DRQ_A31(x) << 16)
79#define DMA_CHAN_CFG_DST_DRQ_H6(x) (DMA_CHAN_CFG_SRC_DRQ_H6(x) << 16)
80#define DMA_CHAN_CFG_DST_MODE_A31(x) (DMA_CHAN_CFG_SRC_MODE_A31(x) << 16)
81#define DMA_CHAN_CFG_DST_MODE_H6(x) (DMA_CHAN_CFG_SRC_MODE_H6(x) << 16)
82#define DMA_CHAN_CFG_DST_BURST_A31(x) (DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
83#define DMA_CHAN_CFG_DST_BURST_H3(x) (DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
84#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
85
86#define DMA_CHAN_CUR_SRC 0x10
87
88#define DMA_CHAN_CUR_DST 0x14
89
90#define DMA_CHAN_CUR_CNT 0x18
91
92#define DMA_CHAN_CUR_PARA 0x1c
93
94/*
95 * LLI address mangling
96 *
97 * The LLI link physical address is also mangled, but we avoid dealing
98 * with that by allocating LLIs from the DMA32 zone.
99 */
100#define SRC_HIGH_ADDR(x) (((x) & 0x3U) << 16)
101#define DST_HIGH_ADDR(x) (((x) & 0x3U) << 18)
102
103/*
104 * Various hardware related defines
105 */
106#define LLI_LAST_ITEM 0xfffff800
107#define NORMAL_WAIT 8
108#define DRQ_SDRAM 1
109#define LINEAR_MODE 0
110#define IO_MODE 1
111
112/* forward declaration */
113struct sun6i_dma_dev;
114
115/*
116 * Hardware channels / ports representation
117 *
118 * The hardware is used in several SoCs, with differing numbers
119 * of channels and endpoints. This structure ties those numbers
120 * to a certain compatible string.
121 */
122struct sun6i_dma_config {
123 u32 nr_max_channels;
124 u32 nr_max_requests;
125 u32 nr_max_vchans;
126 /*
127 * In the datasheets/user manuals of newer Allwinner SoCs, a special
128 * bit (bit 2 at register 0x20) is present.
129 * It's named "DMA MCLK interface circuit auto gating bit" in the
130 * documents, and the footnote of this register says that this bit
131 * should be set up when initializing the DMA controller.
132 * Allwinner A23/A33 user manuals do not have this bit documented,
133 * however these SoCs really have and need this bit, as seen in the
134 * BSP kernel source code.
135 */
136 void (*clock_autogate_enable)(struct sun6i_dma_dev *);
137 void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
138 void (*set_drq)(u32 *p_cfg, s8 src_drq, s8 dst_drq);
139 void (*set_mode)(u32 *p_cfg, s8 src_mode, s8 dst_mode);
140 u32 src_burst_lengths;
141 u32 dst_burst_lengths;
142 u32 src_addr_widths;
143 u32 dst_addr_widths;
144 bool has_high_addr;
145 bool has_mbus_clk;
146};
147
148/*
149 * Hardware representation of the LLI
150 *
151 * The hardware will be fed the physical address of this structure,
152 * and read its content in order to start the transfer.
153 */
154struct sun6i_dma_lli {
155 u32 cfg;
156 u32 src;
157 u32 dst;
158 u32 len;
159 u32 para;
160 u32 p_lli_next;
161
162 /*
163 * This field is not used by the DMA controller, but will be
164 * used by the CPU to go through the list (mostly for dumping
165 * or freeing it).
166 */
167 struct sun6i_dma_lli *v_lli_next;
168};
169
170
171struct sun6i_desc {
172 struct virt_dma_desc vd;
173 dma_addr_t p_lli;
174 struct sun6i_dma_lli *v_lli;
175};
176
177struct sun6i_pchan {
178 u32 idx;
179 void __iomem *base;
180 struct sun6i_vchan *vchan;
181 struct sun6i_desc *desc;
182 struct sun6i_desc *done;
183};
184
185struct sun6i_vchan {
186 struct virt_dma_chan vc;
187 struct list_head node;
188 struct dma_slave_config cfg;
189 struct sun6i_pchan *phy;
190 u8 port;
191 u8 irq_type;
192 bool cyclic;
193};
194
195struct sun6i_dma_dev {
196 struct dma_device slave;
197 void __iomem *base;
198 struct clk *clk;
199 struct clk *clk_mbus;
200 int irq;
201 spinlock_t lock;
202 struct reset_control *rstc;
203 struct tasklet_struct task;
204 atomic_t tasklet_shutdown;
205 struct list_head pending;
206 struct dma_pool *pool;
207 struct sun6i_pchan *pchans;
208 struct sun6i_vchan *vchans;
209 const struct sun6i_dma_config *cfg;
210 u32 num_pchans;
211 u32 num_vchans;
212 u32 max_request;
213};
214
215static struct device *chan2dev(struct dma_chan *chan)
216{
217 return &chan->dev->device;
218}
219
220static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d)
221{
222 return container_of(d, struct sun6i_dma_dev, slave);
223}
224
225static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan)
226{
227 return container_of(chan, struct sun6i_vchan, vc.chan);
228}
229
230static inline struct sun6i_desc *
231to_sun6i_desc(struct dma_async_tx_descriptor *tx)
232{
233 return container_of(tx, struct sun6i_desc, vd.tx);
234}
235
236static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev)
237{
238 dev_dbg(sdev->slave.dev, "Common register:\n"
239 "\tmask0(%04x): 0x%08x\n"
240 "\tmask1(%04x): 0x%08x\n"
241 "\tpend0(%04x): 0x%08x\n"
242 "\tpend1(%04x): 0x%08x\n"
243 "\tstats(%04x): 0x%08x\n",
244 DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)),
245 DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)),
246 DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)),
247 DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)),
248 DMA_STAT, readl(sdev->base + DMA_STAT));
249}
250
251static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
252 struct sun6i_pchan *pchan)
253{
254 dev_dbg(sdev->slave.dev, "Chan %d reg:\n"
255 "\t___en(%04x): \t0x%08x\n"
256 "\tpause(%04x): \t0x%08x\n"
257 "\tstart(%04x): \t0x%08x\n"
258 "\t__cfg(%04x): \t0x%08x\n"
259 "\t__src(%04x): \t0x%08x\n"
260 "\t__dst(%04x): \t0x%08x\n"
261 "\tcount(%04x): \t0x%08x\n"
262 "\t_para(%04x): \t0x%08x\n\n",
263 pchan->idx,
264 DMA_CHAN_ENABLE,
265 readl(pchan->base + DMA_CHAN_ENABLE),
266 DMA_CHAN_PAUSE,
267 readl(pchan->base + DMA_CHAN_PAUSE),
268 DMA_CHAN_LLI_ADDR,
269 readl(pchan->base + DMA_CHAN_LLI_ADDR),
270 DMA_CHAN_CUR_CFG,
271 readl(pchan->base + DMA_CHAN_CUR_CFG),
272 DMA_CHAN_CUR_SRC,
273 readl(pchan->base + DMA_CHAN_CUR_SRC),
274 DMA_CHAN_CUR_DST,
275 readl(pchan->base + DMA_CHAN_CUR_DST),
276 DMA_CHAN_CUR_CNT,
277 readl(pchan->base + DMA_CHAN_CUR_CNT),
278 DMA_CHAN_CUR_PARA,
279 readl(pchan->base + DMA_CHAN_CUR_PARA));
280}
281
282static inline s8 convert_burst(u32 maxburst)
283{
284 switch (maxburst) {
285 case 1:
286 return 0;
287 case 4:
288 return 1;
289 case 8:
290 return 2;
291 case 16:
292 return 3;
293 default:
294 return -EINVAL;
295 }
296}
297
298static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
299{
300 return ilog2(addr_width);
301}
302
303static void sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev *sdev)
304{
305 writel(SUN8I_DMA_GATE_ENABLE, sdev->base + SUN8I_DMA_GATE);
306}
307
308static void sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev *sdev)
309{
310 writel(SUNXI_H3_DMA_GATE_ENABLE, sdev->base + SUNXI_H3_DMA_GATE);
311}
312
313static void sun6i_set_burst_length_a31(u32 *p_cfg, s8 src_burst, s8 dst_burst)
314{
315 *p_cfg |= DMA_CHAN_CFG_SRC_BURST_A31(src_burst) |
316 DMA_CHAN_CFG_DST_BURST_A31(dst_burst);
317}
318
319static void sun6i_set_burst_length_h3(u32 *p_cfg, s8 src_burst, s8 dst_burst)
320{
321 *p_cfg |= DMA_CHAN_CFG_SRC_BURST_H3(src_burst) |
322 DMA_CHAN_CFG_DST_BURST_H3(dst_burst);
323}
324
325static void sun6i_set_drq_a31(u32 *p_cfg, s8 src_drq, s8 dst_drq)
326{
327 *p_cfg |= DMA_CHAN_CFG_SRC_DRQ_A31(src_drq) |
328 DMA_CHAN_CFG_DST_DRQ_A31(dst_drq);
329}
330
331static void sun6i_set_drq_h6(u32 *p_cfg, s8 src_drq, s8 dst_drq)
332{
333 *p_cfg |= DMA_CHAN_CFG_SRC_DRQ_H6(src_drq) |
334 DMA_CHAN_CFG_DST_DRQ_H6(dst_drq);
335}
336
337static void sun6i_set_mode_a31(u32 *p_cfg, s8 src_mode, s8 dst_mode)
338{
339 *p_cfg |= DMA_CHAN_CFG_SRC_MODE_A31(src_mode) |
340 DMA_CHAN_CFG_DST_MODE_A31(dst_mode);
341}
342
343static void sun6i_set_mode_h6(u32 *p_cfg, s8 src_mode, s8 dst_mode)
344{
345 *p_cfg |= DMA_CHAN_CFG_SRC_MODE_H6(src_mode) |
346 DMA_CHAN_CFG_DST_MODE_H6(dst_mode);
347}
348
349static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
350{
351 struct sun6i_desc *txd = pchan->desc;
352 struct sun6i_dma_lli *lli;
353 size_t bytes;
354 dma_addr_t pos;
355
356 pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
357 bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
358
359 if (pos == LLI_LAST_ITEM)
360 return bytes;
361
362 for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
363 if (lli->p_lli_next == pos) {
364 for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
365 bytes += lli->len;
366 break;
367 }
368 }
369
370 return bytes;
371}
372
373static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
374 struct sun6i_dma_lli *next,
375 dma_addr_t next_phy,
376 struct sun6i_desc *txd)
377{
378 if ((!prev && !txd) || !next)
379 return NULL;
380
381 if (!prev) {
382 txd->p_lli = next_phy;
383 txd->v_lli = next;
384 } else {
385 prev->p_lli_next = next_phy;
386 prev->v_lli_next = next;
387 }
388
389 next->p_lli_next = LLI_LAST_ITEM;
390 next->v_lli_next = NULL;
391
392 return next;
393}
394
395static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
396 struct sun6i_dma_lli *v_lli,
397 dma_addr_t p_lli)
398{
399 dev_dbg(chan2dev(&vchan->vc.chan),
400 "\n\tdesc:\tp - %pad v - 0x%p\n"
401 "\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
402 "\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
403 &p_lli, v_lli,
404 v_lli->cfg, v_lli->src, v_lli->dst,
405 v_lli->len, v_lli->para, v_lli->p_lli_next);
406}
407
408static void sun6i_dma_free_desc(struct virt_dma_desc *vd)
409{
410 struct sun6i_desc *txd = to_sun6i_desc(&vd->tx);
411 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device);
412 struct sun6i_dma_lli *v_lli, *v_next;
413 dma_addr_t p_lli, p_next;
414
415 if (unlikely(!txd))
416 return;
417
418 p_lli = txd->p_lli;
419 v_lli = txd->v_lli;
420
421 while (v_lli) {
422 v_next = v_lli->v_lli_next;
423 p_next = v_lli->p_lli_next;
424
425 dma_pool_free(sdev->pool, v_lli, p_lli);
426
427 v_lli = v_next;
428 p_lli = p_next;
429 }
430
431 kfree(txd);
432}
433
434static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
435{
436 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
437 struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc);
438 struct sun6i_pchan *pchan = vchan->phy;
439 u32 irq_val, irq_reg, irq_offset;
440
441 if (!pchan)
442 return -EAGAIN;
443
444 if (!desc) {
445 pchan->desc = NULL;
446 pchan->done = NULL;
447 return -EAGAIN;
448 }
449
450 list_del(&desc->node);
451
452 pchan->desc = to_sun6i_desc(&desc->tx);
453 pchan->done = NULL;
454
455 sun6i_dma_dump_lli(vchan, pchan->desc->v_lli, pchan->desc->p_lli);
456
457 irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
458 irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
459
460 vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
461
462 irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
463 irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
464 (irq_offset * DMA_IRQ_CHAN_WIDTH));
465 irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
466 writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
467
468 writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
469 writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
470
471 sun6i_dma_dump_com_regs(sdev);
472 sun6i_dma_dump_chan_regs(sdev, pchan);
473
474 return 0;
475}
476
477static void sun6i_dma_tasklet(struct tasklet_struct *t)
478{
479 struct sun6i_dma_dev *sdev = from_tasklet(sdev, t, task);
480 struct sun6i_vchan *vchan;
481 struct sun6i_pchan *pchan;
482 unsigned int pchan_alloc = 0;
483 unsigned int pchan_idx;
484
485 list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) {
486 spin_lock_irq(&vchan->vc.lock);
487
488 pchan = vchan->phy;
489
490 if (pchan && pchan->done) {
491 if (sun6i_dma_start_desc(vchan)) {
492 /*
493 * No current txd associated with this channel
494 */
495 dev_dbg(sdev->slave.dev, "pchan %u: free\n",
496 pchan->idx);
497
498 /* Mark this channel free */
499 vchan->phy = NULL;
500 pchan->vchan = NULL;
501 }
502 }
503 spin_unlock_irq(&vchan->vc.lock);
504 }
505
506 spin_lock_irq(&sdev->lock);
507 for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
508 pchan = &sdev->pchans[pchan_idx];
509
510 if (pchan->vchan || list_empty(&sdev->pending))
511 continue;
512
513 vchan = list_first_entry(&sdev->pending,
514 struct sun6i_vchan, node);
515
516 /* Remove from pending channels */
517 list_del_init(&vchan->node);
518 pchan_alloc |= BIT(pchan_idx);
519
520 /* Mark this channel allocated */
521 pchan->vchan = vchan;
522 vchan->phy = pchan;
523 dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n",
524 pchan->idx, &vchan->vc);
525 }
526 spin_unlock_irq(&sdev->lock);
527
528 for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
529 if (!(pchan_alloc & BIT(pchan_idx)))
530 continue;
531
532 pchan = sdev->pchans + pchan_idx;
533 vchan = pchan->vchan;
534 if (vchan) {
535 spin_lock_irq(&vchan->vc.lock);
536 sun6i_dma_start_desc(vchan);
537 spin_unlock_irq(&vchan->vc.lock);
538 }
539 }
540}
541
542static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
543{
544 struct sun6i_dma_dev *sdev = dev_id;
545 struct sun6i_vchan *vchan;
546 struct sun6i_pchan *pchan;
547 int i, j, ret = IRQ_NONE;
548 u32 status;
549
550 for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
551 status = readl(sdev->base + DMA_IRQ_STAT(i));
552 if (!status)
553 continue;
554
555 dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
556 i ? "high" : "low", status);
557
558 writel(status, sdev->base + DMA_IRQ_STAT(i));
559
560 for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
561 pchan = sdev->pchans + j;
562 vchan = pchan->vchan;
563 if (vchan && (status & vchan->irq_type)) {
564 if (vchan->cyclic) {
565 vchan_cyclic_callback(&pchan->desc->vd);
566 } else {
567 spin_lock(&vchan->vc.lock);
568 vchan_cookie_complete(&pchan->desc->vd);
569 pchan->done = pchan->desc;
570 spin_unlock(&vchan->vc.lock);
571 }
572 }
573
574 status = status >> DMA_IRQ_CHAN_WIDTH;
575 }
576
577 if (!atomic_read(&sdev->tasklet_shutdown))
578 tasklet_schedule(&sdev->task);
579 ret = IRQ_HANDLED;
580 }
581
582 return ret;
583}
584
585static int set_config(struct sun6i_dma_dev *sdev,
586 struct dma_slave_config *sconfig,
587 enum dma_transfer_direction direction,
588 u32 *p_cfg)
589{
590 enum dma_slave_buswidth src_addr_width, dst_addr_width;
591 u32 src_maxburst, dst_maxburst;
592 s8 src_width, dst_width, src_burst, dst_burst;
593
594 src_addr_width = sconfig->src_addr_width;
595 dst_addr_width = sconfig->dst_addr_width;
596 src_maxburst = sconfig->src_maxburst;
597 dst_maxburst = sconfig->dst_maxburst;
598
599 switch (direction) {
600 case DMA_MEM_TO_DEV:
601 if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
602 src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
603 src_maxburst = src_maxburst ? src_maxburst : 8;
604 break;
605 case DMA_DEV_TO_MEM:
606 if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
607 dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
608 dst_maxburst = dst_maxburst ? dst_maxburst : 8;
609 break;
610 default:
611 return -EINVAL;
612 }
613
614 if (!(BIT(src_addr_width) & sdev->slave.src_addr_widths))
615 return -EINVAL;
616 if (!(BIT(dst_addr_width) & sdev->slave.dst_addr_widths))
617 return -EINVAL;
618 if (!(BIT(src_maxburst) & sdev->cfg->src_burst_lengths))
619 return -EINVAL;
620 if (!(BIT(dst_maxburst) & sdev->cfg->dst_burst_lengths))
621 return -EINVAL;
622
623 src_width = convert_buswidth(src_addr_width);
624 dst_width = convert_buswidth(dst_addr_width);
625 dst_burst = convert_burst(dst_maxburst);
626 src_burst = convert_burst(src_maxburst);
627
628 *p_cfg = DMA_CHAN_CFG_SRC_WIDTH(src_width) |
629 DMA_CHAN_CFG_DST_WIDTH(dst_width);
630
631 sdev->cfg->set_burst_length(p_cfg, src_burst, dst_burst);
632
633 return 0;
634}
635
636static inline void sun6i_dma_set_addr(struct sun6i_dma_dev *sdev,
637 struct sun6i_dma_lli *v_lli,
638 dma_addr_t src, dma_addr_t dst)
639{
640 v_lli->src = lower_32_bits(src);
641 v_lli->dst = lower_32_bits(dst);
642
643 if (sdev->cfg->has_high_addr)
644 v_lli->para |= SRC_HIGH_ADDR(upper_32_bits(src)) |
645 DST_HIGH_ADDR(upper_32_bits(dst));
646}
647
648static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
649 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
650 size_t len, unsigned long flags)
651{
652 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
653 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
654 struct sun6i_dma_lli *v_lli;
655 struct sun6i_desc *txd;
656 dma_addr_t p_lli;
657 s8 burst, width;
658
659 dev_dbg(chan2dev(chan),
660 "%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
661 __func__, vchan->vc.chan.chan_id, &dest, &src, len, flags);
662
663 if (!len)
664 return NULL;
665
666 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
667 if (!txd)
668 return NULL;
669
670 v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
671 if (!v_lli) {
672 dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
673 goto err_txd_free;
674 }
675
676 v_lli->len = len;
677 v_lli->para = NORMAL_WAIT;
678 sun6i_dma_set_addr(sdev, v_lli, src, dest);
679
680 burst = convert_burst(8);
681 width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
682 v_lli->cfg = DMA_CHAN_CFG_SRC_WIDTH(width) |
683 DMA_CHAN_CFG_DST_WIDTH(width);
684
685 sdev->cfg->set_burst_length(&v_lli->cfg, burst, burst);
686 sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, DRQ_SDRAM);
687 sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, LINEAR_MODE);
688
689 sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
690
691 sun6i_dma_dump_lli(vchan, v_lli, p_lli);
692
693 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
694
695err_txd_free:
696 kfree(txd);
697 return NULL;
698}
699
700static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
701 struct dma_chan *chan, struct scatterlist *sgl,
702 unsigned int sg_len, enum dma_transfer_direction dir,
703 unsigned long flags, void *context)
704{
705 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
706 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
707 struct dma_slave_config *sconfig = &vchan->cfg;
708 struct sun6i_dma_lli *v_lli, *prev = NULL;
709 struct sun6i_desc *txd;
710 struct scatterlist *sg;
711 dma_addr_t p_lli;
712 u32 lli_cfg;
713 int i, ret;
714
715 if (!sgl)
716 return NULL;
717
718 ret = set_config(sdev, sconfig, dir, &lli_cfg);
719 if (ret) {
720 dev_err(chan2dev(chan), "Invalid DMA configuration\n");
721 return NULL;
722 }
723
724 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
725 if (!txd)
726 return NULL;
727
728 for_each_sg(sgl, sg, sg_len, i) {
729 v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
730 if (!v_lli)
731 goto err_lli_free;
732
733 v_lli->len = sg_dma_len(sg);
734 v_lli->para = NORMAL_WAIT;
735
736 if (dir == DMA_MEM_TO_DEV) {
737 sun6i_dma_set_addr(sdev, v_lli,
738 sg_dma_address(sg),
739 sconfig->dst_addr);
740 v_lli->cfg = lli_cfg;
741 sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
742 sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
743
744 dev_dbg(chan2dev(chan),
745 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
746 __func__, vchan->vc.chan.chan_id,
747 &sconfig->dst_addr, &sg_dma_address(sg),
748 sg_dma_len(sg), flags);
749
750 } else {
751 sun6i_dma_set_addr(sdev, v_lli,
752 sconfig->src_addr,
753 sg_dma_address(sg));
754 v_lli->cfg = lli_cfg;
755 sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
756 sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
757
758 dev_dbg(chan2dev(chan),
759 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
760 __func__, vchan->vc.chan.chan_id,
761 &sg_dma_address(sg), &sconfig->src_addr,
762 sg_dma_len(sg), flags);
763 }
764
765 prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
766 }
767
768 dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli);
769 for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
770 p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
771 sun6i_dma_dump_lli(vchan, v_lli, p_lli);
772
773 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
774
775err_lli_free:
776 for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
777 p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
778 dma_pool_free(sdev->pool, v_lli, p_lli);
779 kfree(txd);
780 return NULL;
781}
782
783static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
784 struct dma_chan *chan,
785 dma_addr_t buf_addr,
786 size_t buf_len,
787 size_t period_len,
788 enum dma_transfer_direction dir,
789 unsigned long flags)
790{
791 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
792 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
793 struct dma_slave_config *sconfig = &vchan->cfg;
794 struct sun6i_dma_lli *v_lli, *prev = NULL;
795 struct sun6i_desc *txd;
796 dma_addr_t p_lli;
797 u32 lli_cfg;
798 unsigned int i, periods = buf_len / period_len;
799 int ret;
800
801 ret = set_config(sdev, sconfig, dir, &lli_cfg);
802 if (ret) {
803 dev_err(chan2dev(chan), "Invalid DMA configuration\n");
804 return NULL;
805 }
806
807 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
808 if (!txd)
809 return NULL;
810
811 for (i = 0; i < periods; i++) {
812 v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
813 if (!v_lli) {
814 dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
815 goto err_lli_free;
816 }
817
818 v_lli->len = period_len;
819 v_lli->para = NORMAL_WAIT;
820
821 if (dir == DMA_MEM_TO_DEV) {
822 sun6i_dma_set_addr(sdev, v_lli,
823 buf_addr + period_len * i,
824 sconfig->dst_addr);
825 v_lli->cfg = lli_cfg;
826 sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
827 sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
828 } else {
829 sun6i_dma_set_addr(sdev, v_lli,
830 sconfig->src_addr,
831 buf_addr + period_len * i);
832 v_lli->cfg = lli_cfg;
833 sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
834 sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
835 }
836
837 prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
838 }
839
840 prev->p_lli_next = txd->p_lli; /* cyclic list */
841
842 vchan->cyclic = true;
843
844 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
845
846err_lli_free:
847 for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
848 p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
849 dma_pool_free(sdev->pool, v_lli, p_lli);
850 kfree(txd);
851 return NULL;
852}
853
854static int sun6i_dma_config(struct dma_chan *chan,
855 struct dma_slave_config *config)
856{
857 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
858
859 memcpy(&vchan->cfg, config, sizeof(*config));
860
861 return 0;
862}
863
864static int sun6i_dma_pause(struct dma_chan *chan)
865{
866 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
867 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
868 struct sun6i_pchan *pchan = vchan->phy;
869
870 dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc);
871
872 if (pchan) {
873 writel(DMA_CHAN_PAUSE_PAUSE,
874 pchan->base + DMA_CHAN_PAUSE);
875 } else {
876 spin_lock(&sdev->lock);
877 list_del_init(&vchan->node);
878 spin_unlock(&sdev->lock);
879 }
880
881 return 0;
882}
883
884static int sun6i_dma_resume(struct dma_chan *chan)
885{
886 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
887 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
888 struct sun6i_pchan *pchan = vchan->phy;
889 unsigned long flags;
890
891 dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
892
893 spin_lock_irqsave(&vchan->vc.lock, flags);
894
895 if (pchan) {
896 writel(DMA_CHAN_PAUSE_RESUME,
897 pchan->base + DMA_CHAN_PAUSE);
898 } else if (!list_empty(&vchan->vc.desc_issued)) {
899 spin_lock(&sdev->lock);
900 list_add_tail(&vchan->node, &sdev->pending);
901 spin_unlock(&sdev->lock);
902 }
903
904 spin_unlock_irqrestore(&vchan->vc.lock, flags);
905
906 return 0;
907}
908
909static int sun6i_dma_terminate_all(struct dma_chan *chan)
910{
911 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
912 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
913 struct sun6i_pchan *pchan = vchan->phy;
914 unsigned long flags;
915 LIST_HEAD(head);
916
917 spin_lock(&sdev->lock);
918 list_del_init(&vchan->node);
919 spin_unlock(&sdev->lock);
920
921 spin_lock_irqsave(&vchan->vc.lock, flags);
922
923 if (vchan->cyclic) {
924 vchan->cyclic = false;
925 if (pchan && pchan->desc) {
926 struct virt_dma_desc *vd = &pchan->desc->vd;
927 struct virt_dma_chan *vc = &vchan->vc;
928
929 list_add_tail(&vd->node, &vc->desc_completed);
930 }
931 }
932
933 vchan_get_all_descriptors(&vchan->vc, &head);
934
935 if (pchan) {
936 writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
937 writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
938
939 vchan->phy = NULL;
940 pchan->vchan = NULL;
941 pchan->desc = NULL;
942 pchan->done = NULL;
943 }
944
945 spin_unlock_irqrestore(&vchan->vc.lock, flags);
946
947 vchan_dma_desc_free_list(&vchan->vc, &head);
948
949 return 0;
950}
951
952static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
953 dma_cookie_t cookie,
954 struct dma_tx_state *state)
955{
956 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
957 struct sun6i_pchan *pchan = vchan->phy;
958 struct sun6i_dma_lli *lli;
959 struct virt_dma_desc *vd;
960 struct sun6i_desc *txd;
961 enum dma_status ret;
962 unsigned long flags;
963 size_t bytes = 0;
964
965 ret = dma_cookie_status(chan, cookie, state);
966 if (ret == DMA_COMPLETE || !state)
967 return ret;
968
969 spin_lock_irqsave(&vchan->vc.lock, flags);
970
971 vd = vchan_find_desc(&vchan->vc, cookie);
972 txd = to_sun6i_desc(&vd->tx);
973
974 if (vd) {
975 for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next)
976 bytes += lli->len;
977 } else if (!pchan || !pchan->desc) {
978 bytes = 0;
979 } else {
980 bytes = sun6i_get_chan_size(pchan);
981 }
982
983 spin_unlock_irqrestore(&vchan->vc.lock, flags);
984
985 dma_set_residue(state, bytes);
986
987 return ret;
988}
989
990static void sun6i_dma_issue_pending(struct dma_chan *chan)
991{
992 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
993 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
994 unsigned long flags;
995
996 spin_lock_irqsave(&vchan->vc.lock, flags);
997
998 if (vchan_issue_pending(&vchan->vc)) {
999 spin_lock(&sdev->lock);
1000
1001 if (!vchan->phy && list_empty(&vchan->node)) {
1002 list_add_tail(&vchan->node, &sdev->pending);
1003 tasklet_schedule(&sdev->task);
1004 dev_dbg(chan2dev(chan), "vchan %p: issued\n",
1005 &vchan->vc);
1006 }
1007
1008 spin_unlock(&sdev->lock);
1009 } else {
1010 dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n",
1011 &vchan->vc);
1012 }
1013
1014 spin_unlock_irqrestore(&vchan->vc.lock, flags);
1015}
1016
1017static void sun6i_dma_free_chan_resources(struct dma_chan *chan)
1018{
1019 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
1020 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&sdev->lock, flags);
1024 list_del_init(&vchan->node);
1025 spin_unlock_irqrestore(&sdev->lock, flags);
1026
1027 vchan_free_chan_resources(&vchan->vc);
1028}
1029
1030static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
1031 struct of_dma *ofdma)
1032{
1033 struct sun6i_dma_dev *sdev = ofdma->of_dma_data;
1034 struct sun6i_vchan *vchan;
1035 struct dma_chan *chan;
1036 u8 port = dma_spec->args[0];
1037
1038 if (port > sdev->max_request)
1039 return NULL;
1040
1041 chan = dma_get_any_slave_channel(&sdev->slave);
1042 if (!chan)
1043 return NULL;
1044
1045 vchan = to_sun6i_vchan(chan);
1046 vchan->port = port;
1047
1048 return chan;
1049}
1050
1051static inline void sun6i_kill_tasklet(struct sun6i_dma_dev *sdev)
1052{
1053 /* Disable all interrupts from DMA */
1054 writel(0, sdev->base + DMA_IRQ_EN(0));
1055 writel(0, sdev->base + DMA_IRQ_EN(1));
1056
1057 /* Prevent spurious interrupts from scheduling the tasklet */
1058 atomic_inc(&sdev->tasklet_shutdown);
1059
1060 /* Make sure we won't have any further interrupts */
1061 devm_free_irq(sdev->slave.dev, sdev->irq, sdev);
1062
1063 /* Actually prevent the tasklet from being scheduled */
1064 tasklet_kill(&sdev->task);
1065}
1066
1067static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
1068{
1069 int i;
1070
1071 for (i = 0; i < sdev->num_vchans; i++) {
1072 struct sun6i_vchan *vchan = &sdev->vchans[i];
1073
1074 list_del(&vchan->vc.chan.device_node);
1075 tasklet_kill(&vchan->vc.task);
1076 }
1077}
1078
1079/*
1080 * For A31:
1081 *
1082 * There's 16 physical channels that can work in parallel.
1083 *
1084 * However we have 30 different endpoints for our requests.
1085 *
1086 * Since the channels are able to handle only an unidirectional
1087 * transfer, we need to allocate more virtual channels so that
1088 * everyone can grab one channel.
1089 *
1090 * Some devices can't work in both direction (mostly because it
1091 * wouldn't make sense), so we have a bit fewer virtual channels than
1092 * 2 channels per endpoints.
1093 */
1094
1095static struct sun6i_dma_config sun6i_a31_dma_cfg = {
1096 .nr_max_channels = 16,
1097 .nr_max_requests = 30,
1098 .nr_max_vchans = 53,
1099 .set_burst_length = sun6i_set_burst_length_a31,
1100 .set_drq = sun6i_set_drq_a31,
1101 .set_mode = sun6i_set_mode_a31,
1102 .src_burst_lengths = BIT(1) | BIT(8),
1103 .dst_burst_lengths = BIT(1) | BIT(8),
1104 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1105 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1106 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1107 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1108 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1109 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1110};
1111
1112/*
1113 * The A23 only has 8 physical channels, a maximum DRQ port id of 24,
1114 * and a total of 37 usable source and destination endpoints.
1115 */
1116
1117static struct sun6i_dma_config sun8i_a23_dma_cfg = {
1118 .nr_max_channels = 8,
1119 .nr_max_requests = 24,
1120 .nr_max_vchans = 37,
1121 .clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1122 .set_burst_length = sun6i_set_burst_length_a31,
1123 .set_drq = sun6i_set_drq_a31,
1124 .set_mode = sun6i_set_mode_a31,
1125 .src_burst_lengths = BIT(1) | BIT(8),
1126 .dst_burst_lengths = BIT(1) | BIT(8),
1127 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1128 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1129 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1130 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1131 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1132 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1133};
1134
1135static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
1136 .nr_max_channels = 8,
1137 .nr_max_requests = 28,
1138 .nr_max_vchans = 39,
1139 .clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1140 .set_burst_length = sun6i_set_burst_length_a31,
1141 .set_drq = sun6i_set_drq_a31,
1142 .set_mode = sun6i_set_mode_a31,
1143 .src_burst_lengths = BIT(1) | BIT(8),
1144 .dst_burst_lengths = BIT(1) | BIT(8),
1145 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1146 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1147 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1148 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1149 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1150 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1151};
1152
1153/*
1154 * The H3 has 12 physical channels, a maximum DRQ port id of 27,
1155 * and a total of 34 usable source and destination endpoints.
1156 * It also supports additional burst lengths and bus widths,
1157 * and the burst length fields have different offsets.
1158 */
1159
1160static struct sun6i_dma_config sun8i_h3_dma_cfg = {
1161 .nr_max_channels = 12,
1162 .nr_max_requests = 27,
1163 .nr_max_vchans = 34,
1164 .clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1165 .set_burst_length = sun6i_set_burst_length_h3,
1166 .set_drq = sun6i_set_drq_a31,
1167 .set_mode = sun6i_set_mode_a31,
1168 .src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1169 .dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1170 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1171 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1172 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1173 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1174 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1175 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1176 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1177 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1178};
1179
1180/*
1181 * The A64 binding uses the number of dma channels from the
1182 * device tree node.
1183 */
1184static struct sun6i_dma_config sun50i_a64_dma_cfg = {
1185 .clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1186 .set_burst_length = sun6i_set_burst_length_h3,
1187 .set_drq = sun6i_set_drq_a31,
1188 .set_mode = sun6i_set_mode_a31,
1189 .src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1190 .dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1191 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1192 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1193 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1194 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1195 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1196 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1197 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1198 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1199};
1200
1201/*
1202 * The A100 binding uses the number of dma channels from the
1203 * device tree node.
1204 */
1205static struct sun6i_dma_config sun50i_a100_dma_cfg = {
1206 .clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1207 .set_burst_length = sun6i_set_burst_length_h3,
1208 .set_drq = sun6i_set_drq_h6,
1209 .set_mode = sun6i_set_mode_h6,
1210 .src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1211 .dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1212 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1213 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1214 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1215 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1216 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1217 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1218 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1219 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1220 .has_high_addr = true,
1221 .has_mbus_clk = true,
1222};
1223
1224/*
1225 * The H6 binding uses the number of dma channels from the
1226 * device tree node.
1227 */
1228static struct sun6i_dma_config sun50i_h6_dma_cfg = {
1229 .clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1230 .set_burst_length = sun6i_set_burst_length_h3,
1231 .set_drq = sun6i_set_drq_h6,
1232 .set_mode = sun6i_set_mode_h6,
1233 .src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1234 .dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1235 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1236 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1237 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1238 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1239 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1240 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1241 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1242 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1243 .has_mbus_clk = true,
1244};
1245
1246/*
1247 * The V3s have only 8 physical channels, a maximum DRQ port id of 23,
1248 * and a total of 24 usable source and destination endpoints.
1249 */
1250
1251static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
1252 .nr_max_channels = 8,
1253 .nr_max_requests = 23,
1254 .nr_max_vchans = 24,
1255 .clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1256 .set_burst_length = sun6i_set_burst_length_a31,
1257 .set_drq = sun6i_set_drq_a31,
1258 .set_mode = sun6i_set_mode_a31,
1259 .src_burst_lengths = BIT(1) | BIT(8),
1260 .dst_burst_lengths = BIT(1) | BIT(8),
1261 .src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1262 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1263 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1264 .dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1265 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1266 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1267};
1268
1269static const struct of_device_id sun6i_dma_match[] = {
1270 { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
1271 { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
1272 { .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
1273 { .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
1274 { .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
1275 { .compatible = "allwinner,sun20i-d1-dma", .data = &sun50i_a100_dma_cfg },
1276 { .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
1277 { .compatible = "allwinner,sun50i-a100-dma", .data = &sun50i_a100_dma_cfg },
1278 { .compatible = "allwinner,sun50i-h6-dma", .data = &sun50i_h6_dma_cfg },
1279 { /* sentinel */ }
1280};
1281MODULE_DEVICE_TABLE(of, sun6i_dma_match);
1282
1283static int sun6i_dma_probe(struct platform_device *pdev)
1284{
1285 struct device_node *np = pdev->dev.of_node;
1286 struct sun6i_dma_dev *sdc;
1287 int ret, i;
1288
1289 sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
1290 if (!sdc)
1291 return -ENOMEM;
1292
1293 sdc->cfg = of_device_get_match_data(&pdev->dev);
1294 if (!sdc->cfg)
1295 return -ENODEV;
1296
1297 sdc->base = devm_platform_ioremap_resource(pdev, 0);
1298 if (IS_ERR(sdc->base))
1299 return PTR_ERR(sdc->base);
1300
1301 sdc->irq = platform_get_irq(pdev, 0);
1302 if (sdc->irq < 0)
1303 return sdc->irq;
1304
1305 sdc->clk = devm_clk_get(&pdev->dev, NULL);
1306 if (IS_ERR(sdc->clk)) {
1307 dev_err(&pdev->dev, "No clock specified\n");
1308 return PTR_ERR(sdc->clk);
1309 }
1310
1311 if (sdc->cfg->has_mbus_clk) {
1312 sdc->clk_mbus = devm_clk_get(&pdev->dev, "mbus");
1313 if (IS_ERR(sdc->clk_mbus)) {
1314 dev_err(&pdev->dev, "No mbus clock specified\n");
1315 return PTR_ERR(sdc->clk_mbus);
1316 }
1317 }
1318
1319 sdc->rstc = devm_reset_control_get(&pdev->dev, NULL);
1320 if (IS_ERR(sdc->rstc)) {
1321 dev_err(&pdev->dev, "No reset controller specified\n");
1322 return PTR_ERR(sdc->rstc);
1323 }
1324
1325 sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
1326 sizeof(struct sun6i_dma_lli), 4, 0);
1327 if (!sdc->pool) {
1328 dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
1329 return -ENOMEM;
1330 }
1331
1332 platform_set_drvdata(pdev, sdc);
1333 INIT_LIST_HEAD(&sdc->pending);
1334 spin_lock_init(&sdc->lock);
1335
1336 dma_set_max_seg_size(&pdev->dev, SZ_32M - 1);
1337
1338 dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
1339 dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
1340 dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
1341 dma_cap_set(DMA_CYCLIC, sdc->slave.cap_mask);
1342
1343 INIT_LIST_HEAD(&sdc->slave.channels);
1344 sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources;
1345 sdc->slave.device_tx_status = sun6i_dma_tx_status;
1346 sdc->slave.device_issue_pending = sun6i_dma_issue_pending;
1347 sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg;
1348 sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy;
1349 sdc->slave.device_prep_dma_cyclic = sun6i_dma_prep_dma_cyclic;
1350 sdc->slave.copy_align = DMAENGINE_ALIGN_4_BYTES;
1351 sdc->slave.device_config = sun6i_dma_config;
1352 sdc->slave.device_pause = sun6i_dma_pause;
1353 sdc->slave.device_resume = sun6i_dma_resume;
1354 sdc->slave.device_terminate_all = sun6i_dma_terminate_all;
1355 sdc->slave.src_addr_widths = sdc->cfg->src_addr_widths;
1356 sdc->slave.dst_addr_widths = sdc->cfg->dst_addr_widths;
1357 sdc->slave.directions = BIT(DMA_DEV_TO_MEM) |
1358 BIT(DMA_MEM_TO_DEV);
1359 sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1360 sdc->slave.dev = &pdev->dev;
1361
1362 sdc->num_pchans = sdc->cfg->nr_max_channels;
1363 sdc->num_vchans = sdc->cfg->nr_max_vchans;
1364 sdc->max_request = sdc->cfg->nr_max_requests;
1365
1366 ret = of_property_read_u32(np, "dma-channels", &sdc->num_pchans);
1367 if (ret && !sdc->num_pchans) {
1368 dev_err(&pdev->dev, "Can't get dma-channels.\n");
1369 return ret;
1370 }
1371
1372 ret = of_property_read_u32(np, "dma-requests", &sdc->max_request);
1373 if (ret && !sdc->max_request) {
1374 dev_info(&pdev->dev, "Missing dma-requests, using %u.\n",
1375 DMA_CHAN_MAX_DRQ_A31);
1376 sdc->max_request = DMA_CHAN_MAX_DRQ_A31;
1377 }
1378
1379 /*
1380 * If the number of vchans is not specified, derive it from the
1381 * highest port number, at most one channel per port and direction.
1382 */
1383 if (!sdc->num_vchans)
1384 sdc->num_vchans = 2 * (sdc->max_request + 1);
1385
1386 sdc->pchans = devm_kcalloc(&pdev->dev, sdc->num_pchans,
1387 sizeof(struct sun6i_pchan), GFP_KERNEL);
1388 if (!sdc->pchans)
1389 return -ENOMEM;
1390
1391 sdc->vchans = devm_kcalloc(&pdev->dev, sdc->num_vchans,
1392 sizeof(struct sun6i_vchan), GFP_KERNEL);
1393 if (!sdc->vchans)
1394 return -ENOMEM;
1395
1396 tasklet_setup(&sdc->task, sun6i_dma_tasklet);
1397
1398 for (i = 0; i < sdc->num_pchans; i++) {
1399 struct sun6i_pchan *pchan = &sdc->pchans[i];
1400
1401 pchan->idx = i;
1402 pchan->base = sdc->base + 0x100 + i * 0x40;
1403 }
1404
1405 for (i = 0; i < sdc->num_vchans; i++) {
1406 struct sun6i_vchan *vchan = &sdc->vchans[i];
1407
1408 INIT_LIST_HEAD(&vchan->node);
1409 vchan->vc.desc_free = sun6i_dma_free_desc;
1410 vchan_init(&vchan->vc, &sdc->slave);
1411 }
1412
1413 ret = reset_control_deassert(sdc->rstc);
1414 if (ret) {
1415 dev_err(&pdev->dev, "Couldn't deassert the device from reset\n");
1416 goto err_chan_free;
1417 }
1418
1419 ret = clk_prepare_enable(sdc->clk);
1420 if (ret) {
1421 dev_err(&pdev->dev, "Couldn't enable the clock\n");
1422 goto err_reset_assert;
1423 }
1424
1425 if (sdc->cfg->has_mbus_clk) {
1426 ret = clk_prepare_enable(sdc->clk_mbus);
1427 if (ret) {
1428 dev_err(&pdev->dev, "Couldn't enable mbus clock\n");
1429 goto err_clk_disable;
1430 }
1431 }
1432
1433 ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0,
1434 dev_name(&pdev->dev), sdc);
1435 if (ret) {
1436 dev_err(&pdev->dev, "Cannot request IRQ\n");
1437 goto err_mbus_clk_disable;
1438 }
1439
1440 ret = dma_async_device_register(&sdc->slave);
1441 if (ret) {
1442 dev_warn(&pdev->dev, "Failed to register DMA engine device\n");
1443 goto err_irq_disable;
1444 }
1445
1446 ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate,
1447 sdc);
1448 if (ret) {
1449 dev_err(&pdev->dev, "of_dma_controller_register failed\n");
1450 goto err_dma_unregister;
1451 }
1452
1453 if (sdc->cfg->clock_autogate_enable)
1454 sdc->cfg->clock_autogate_enable(sdc);
1455
1456 return 0;
1457
1458err_dma_unregister:
1459 dma_async_device_unregister(&sdc->slave);
1460err_irq_disable:
1461 sun6i_kill_tasklet(sdc);
1462err_mbus_clk_disable:
1463 clk_disable_unprepare(sdc->clk_mbus);
1464err_clk_disable:
1465 clk_disable_unprepare(sdc->clk);
1466err_reset_assert:
1467 reset_control_assert(sdc->rstc);
1468err_chan_free:
1469 sun6i_dma_free(sdc);
1470 return ret;
1471}
1472
1473static void sun6i_dma_remove(struct platform_device *pdev)
1474{
1475 struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev);
1476
1477 of_dma_controller_free(pdev->dev.of_node);
1478 dma_async_device_unregister(&sdc->slave);
1479
1480 sun6i_kill_tasklet(sdc);
1481
1482 clk_disable_unprepare(sdc->clk_mbus);
1483 clk_disable_unprepare(sdc->clk);
1484 reset_control_assert(sdc->rstc);
1485
1486 sun6i_dma_free(sdc);
1487}
1488
1489static struct platform_driver sun6i_dma_driver = {
1490 .probe = sun6i_dma_probe,
1491 .remove_new = sun6i_dma_remove,
1492 .driver = {
1493 .name = "sun6i-dma",
1494 .of_match_table = sun6i_dma_match,
1495 },
1496};
1497module_platform_driver(sun6i_dma_driver);
1498
1499MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver");
1500MODULE_AUTHOR("Sugar <shuge@allwinnertech.com>");
1501MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1502MODULE_LICENSE("GPL");