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