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7c169a42 LPC |
1 | /* |
2 | * Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de> | |
3 | * JZ4740 DMAC support | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
7c169a42 LPC |
10 | */ |
11 | ||
12 | #include <linux/dmaengine.h> | |
13 | #include <linux/dma-mapping.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/spinlock.h> | |
25ce6c35 LPC |
21 | #include <linux/irq.h> |
22 | #include <linux/clk.h> | |
7c169a42 | 23 | |
7c169a42 LPC |
24 | #include "virt-dma.h" |
25 | ||
26 | #define JZ_DMA_NR_CHANS 6 | |
27 | ||
25ce6c35 LPC |
28 | #define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20) |
29 | #define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20) | |
30 | #define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20) | |
31 | #define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20) | |
32 | #define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20) | |
33 | #define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20) | |
34 | #define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20) | |
35 | ||
36 | #define JZ_REG_DMA_CTRL 0x300 | |
37 | #define JZ_REG_DMA_IRQ 0x304 | |
38 | #define JZ_REG_DMA_DOORBELL 0x308 | |
39 | #define JZ_REG_DMA_DOORBELL_SET 0x30C | |
40 | ||
41 | #define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31) | |
42 | #define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6) | |
43 | #define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4) | |
44 | #define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3) | |
45 | #define JZ_DMA_STATUS_CTRL_HALT BIT(2) | |
46 | #define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1) | |
47 | #define JZ_DMA_STATUS_CTRL_ENABLE BIT(0) | |
48 | ||
49 | #define JZ_DMA_CMD_SRC_INC BIT(23) | |
50 | #define JZ_DMA_CMD_DST_INC BIT(22) | |
51 | #define JZ_DMA_CMD_RDIL_MASK (0xf << 16) | |
52 | #define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14) | |
53 | #define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12) | |
54 | #define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8) | |
55 | #define JZ_DMA_CMD_BLOCK_MODE BIT(7) | |
56 | #define JZ_DMA_CMD_DESC_VALID BIT(4) | |
57 | #define JZ_DMA_CMD_DESC_VALID_MODE BIT(3) | |
58 | #define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2) | |
59 | #define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1) | |
60 | #define JZ_DMA_CMD_LINK_ENABLE BIT(0) | |
61 | ||
62 | #define JZ_DMA_CMD_FLAGS_OFFSET 22 | |
63 | #define JZ_DMA_CMD_RDIL_OFFSET 16 | |
64 | #define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14 | |
65 | #define JZ_DMA_CMD_DST_WIDTH_OFFSET 12 | |
66 | #define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8 | |
67 | #define JZ_DMA_CMD_MODE_OFFSET 7 | |
68 | ||
69 | #define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8) | |
70 | #define JZ_DMA_CTRL_HALT BIT(3) | |
71 | #define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2) | |
72 | #define JZ_DMA_CTRL_ENABLE BIT(0) | |
73 | ||
74 | enum jz4740_dma_width { | |
75 | JZ4740_DMA_WIDTH_32BIT = 0, | |
76 | JZ4740_DMA_WIDTH_8BIT = 1, | |
77 | JZ4740_DMA_WIDTH_16BIT = 2, | |
78 | }; | |
79 | ||
80 | enum jz4740_dma_transfer_size { | |
81 | JZ4740_DMA_TRANSFER_SIZE_4BYTE = 0, | |
82 | JZ4740_DMA_TRANSFER_SIZE_1BYTE = 1, | |
83 | JZ4740_DMA_TRANSFER_SIZE_2BYTE = 2, | |
84 | JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3, | |
85 | JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4, | |
86 | }; | |
87 | ||
88 | enum jz4740_dma_flags { | |
89 | JZ4740_DMA_SRC_AUTOINC = 0x2, | |
90 | JZ4740_DMA_DST_AUTOINC = 0x1, | |
91 | }; | |
92 | ||
93 | enum jz4740_dma_mode { | |
94 | JZ4740_DMA_MODE_SINGLE = 0, | |
95 | JZ4740_DMA_MODE_BLOCK = 1, | |
96 | }; | |
97 | ||
7c169a42 LPC |
98 | struct jz4740_dma_sg { |
99 | dma_addr_t addr; | |
100 | unsigned int len; | |
101 | }; | |
102 | ||
103 | struct jz4740_dma_desc { | |
104 | struct virt_dma_desc vdesc; | |
105 | ||
106 | enum dma_transfer_direction direction; | |
107 | bool cyclic; | |
108 | ||
109 | unsigned int num_sgs; | |
110 | struct jz4740_dma_sg sg[]; | |
111 | }; | |
112 | ||
113 | struct jz4740_dmaengine_chan { | |
114 | struct virt_dma_chan vchan; | |
25ce6c35 | 115 | unsigned int id; |
7c169a42 LPC |
116 | |
117 | dma_addr_t fifo_addr; | |
25ce6c35 | 118 | unsigned int transfer_shift; |
7c169a42 LPC |
119 | |
120 | struct jz4740_dma_desc *desc; | |
121 | unsigned int next_sg; | |
122 | }; | |
123 | ||
124 | struct jz4740_dma_dev { | |
125 | struct dma_device ddev; | |
25ce6c35 LPC |
126 | void __iomem *base; |
127 | struct clk *clk; | |
7c169a42 LPC |
128 | |
129 | struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS]; | |
130 | }; | |
131 | ||
25ce6c35 LPC |
132 | static struct jz4740_dma_dev *jz4740_dma_chan_get_dev( |
133 | struct jz4740_dmaengine_chan *chan) | |
134 | { | |
135 | return container_of(chan->vchan.chan.device, struct jz4740_dma_dev, | |
136 | ddev); | |
137 | } | |
138 | ||
7c169a42 LPC |
139 | static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c) |
140 | { | |
141 | return container_of(c, struct jz4740_dmaengine_chan, vchan.chan); | |
142 | } | |
143 | ||
144 | static struct jz4740_dma_desc *to_jz4740_dma_desc(struct virt_dma_desc *vdesc) | |
145 | { | |
146 | return container_of(vdesc, struct jz4740_dma_desc, vdesc); | |
147 | } | |
148 | ||
25ce6c35 LPC |
149 | static inline uint32_t jz4740_dma_read(struct jz4740_dma_dev *dmadev, |
150 | unsigned int reg) | |
151 | { | |
152 | return readl(dmadev->base + reg); | |
153 | } | |
154 | ||
155 | static inline void jz4740_dma_write(struct jz4740_dma_dev *dmadev, | |
156 | unsigned reg, uint32_t val) | |
157 | { | |
158 | writel(val, dmadev->base + reg); | |
159 | } | |
160 | ||
161 | static inline void jz4740_dma_write_mask(struct jz4740_dma_dev *dmadev, | |
162 | unsigned int reg, uint32_t val, uint32_t mask) | |
163 | { | |
164 | uint32_t tmp; | |
165 | ||
166 | tmp = jz4740_dma_read(dmadev, reg); | |
167 | tmp &= ~mask; | |
168 | tmp |= val; | |
169 | jz4740_dma_write(dmadev, reg, tmp); | |
170 | } | |
171 | ||
7c169a42 LPC |
172 | static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs) |
173 | { | |
174 | return kzalloc(sizeof(struct jz4740_dma_desc) + | |
175 | sizeof(struct jz4740_dma_sg) * num_sgs, GFP_ATOMIC); | |
176 | } | |
177 | ||
178 | static enum jz4740_dma_width jz4740_dma_width(enum dma_slave_buswidth width) | |
179 | { | |
180 | switch (width) { | |
181 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
182 | return JZ4740_DMA_WIDTH_8BIT; | |
183 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
184 | return JZ4740_DMA_WIDTH_16BIT; | |
185 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
186 | return JZ4740_DMA_WIDTH_32BIT; | |
187 | default: | |
188 | return JZ4740_DMA_WIDTH_32BIT; | |
189 | } | |
190 | } | |
191 | ||
192 | static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst) | |
193 | { | |
194 | if (maxburst <= 1) | |
195 | return JZ4740_DMA_TRANSFER_SIZE_1BYTE; | |
196 | else if (maxburst <= 3) | |
197 | return JZ4740_DMA_TRANSFER_SIZE_2BYTE; | |
198 | else if (maxburst <= 15) | |
199 | return JZ4740_DMA_TRANSFER_SIZE_4BYTE; | |
200 | else if (maxburst <= 31) | |
201 | return JZ4740_DMA_TRANSFER_SIZE_16BYTE; | |
202 | ||
203 | return JZ4740_DMA_TRANSFER_SIZE_32BYTE; | |
204 | } | |
205 | ||
206 | static int jz4740_dma_slave_config(struct dma_chan *c, | |
1d4c0b8c | 207 | struct dma_slave_config *config) |
7c169a42 LPC |
208 | { |
209 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
25ce6c35 LPC |
210 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
211 | enum jz4740_dma_width src_width; | |
212 | enum jz4740_dma_width dst_width; | |
213 | enum jz4740_dma_transfer_size transfer_size; | |
214 | enum jz4740_dma_flags flags; | |
215 | uint32_t cmd; | |
7c169a42 LPC |
216 | |
217 | switch (config->direction) { | |
218 | case DMA_MEM_TO_DEV: | |
25ce6c35 LPC |
219 | flags = JZ4740_DMA_SRC_AUTOINC; |
220 | transfer_size = jz4740_dma_maxburst(config->dst_maxburst); | |
7c169a42 LPC |
221 | chan->fifo_addr = config->dst_addr; |
222 | break; | |
223 | case DMA_DEV_TO_MEM: | |
25ce6c35 LPC |
224 | flags = JZ4740_DMA_DST_AUTOINC; |
225 | transfer_size = jz4740_dma_maxburst(config->src_maxburst); | |
7c169a42 LPC |
226 | chan->fifo_addr = config->src_addr; |
227 | break; | |
228 | default: | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
25ce6c35 LPC |
232 | src_width = jz4740_dma_width(config->src_addr_width); |
233 | dst_width = jz4740_dma_width(config->dst_addr_width); | |
234 | ||
235 | switch (transfer_size) { | |
236 | case JZ4740_DMA_TRANSFER_SIZE_2BYTE: | |
237 | chan->transfer_shift = 1; | |
238 | break; | |
239 | case JZ4740_DMA_TRANSFER_SIZE_4BYTE: | |
240 | chan->transfer_shift = 2; | |
241 | break; | |
242 | case JZ4740_DMA_TRANSFER_SIZE_16BYTE: | |
243 | chan->transfer_shift = 4; | |
244 | break; | |
245 | case JZ4740_DMA_TRANSFER_SIZE_32BYTE: | |
246 | chan->transfer_shift = 5; | |
247 | break; | |
248 | default: | |
249 | chan->transfer_shift = 0; | |
250 | break; | |
251 | } | |
7c169a42 | 252 | |
25ce6c35 LPC |
253 | cmd = flags << JZ_DMA_CMD_FLAGS_OFFSET; |
254 | cmd |= src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET; | |
255 | cmd |= dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET; | |
256 | cmd |= transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET; | |
257 | cmd |= JZ4740_DMA_MODE_SINGLE << JZ_DMA_CMD_MODE_OFFSET; | |
258 | cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE; | |
7c169a42 | 259 | |
25ce6c35 LPC |
260 | jz4740_dma_write(dmadev, JZ_REG_DMA_CMD(chan->id), cmd); |
261 | jz4740_dma_write(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0); | |
262 | jz4740_dma_write(dmadev, JZ_REG_DMA_REQ_TYPE(chan->id), | |
263 | config->slave_id); | |
7c169a42 LPC |
264 | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int jz4740_dma_terminate_all(struct dma_chan *c) | |
269 | { | |
270 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
25ce6c35 | 271 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
7c169a42 LPC |
272 | unsigned long flags; |
273 | LIST_HEAD(head); | |
274 | ||
275 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
25ce6c35 LPC |
276 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, |
277 | JZ_DMA_STATUS_CTRL_ENABLE); | |
7c169a42 LPC |
278 | chan->desc = NULL; |
279 | vchan_get_all_descriptors(&chan->vchan, &head); | |
280 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
281 | ||
282 | vchan_dma_desc_free_list(&chan->vchan, &head); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
7c169a42 LPC |
287 | static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan) |
288 | { | |
25ce6c35 | 289 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
7c169a42 LPC |
290 | dma_addr_t src_addr, dst_addr; |
291 | struct virt_dma_desc *vdesc; | |
292 | struct jz4740_dma_sg *sg; | |
293 | ||
25ce6c35 LPC |
294 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, |
295 | JZ_DMA_STATUS_CTRL_ENABLE); | |
7c169a42 LPC |
296 | |
297 | if (!chan->desc) { | |
298 | vdesc = vchan_next_desc(&chan->vchan); | |
299 | if (!vdesc) | |
300 | return 0; | |
301 | chan->desc = to_jz4740_dma_desc(vdesc); | |
302 | chan->next_sg = 0; | |
303 | } | |
304 | ||
305 | if (chan->next_sg == chan->desc->num_sgs) | |
306 | chan->next_sg = 0; | |
307 | ||
308 | sg = &chan->desc->sg[chan->next_sg]; | |
309 | ||
310 | if (chan->desc->direction == DMA_MEM_TO_DEV) { | |
311 | src_addr = sg->addr; | |
312 | dst_addr = chan->fifo_addr; | |
313 | } else { | |
314 | src_addr = chan->fifo_addr; | |
315 | dst_addr = sg->addr; | |
316 | } | |
25ce6c35 LPC |
317 | jz4740_dma_write(dmadev, JZ_REG_DMA_SRC_ADDR(chan->id), src_addr); |
318 | jz4740_dma_write(dmadev, JZ_REG_DMA_DST_ADDR(chan->id), dst_addr); | |
319 | jz4740_dma_write(dmadev, JZ_REG_DMA_TRANSFER_COUNT(chan->id), | |
320 | sg->len >> chan->transfer_shift); | |
7c169a42 LPC |
321 | |
322 | chan->next_sg++; | |
323 | ||
25ce6c35 LPC |
324 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), |
325 | JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE, | |
326 | JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC | | |
327 | JZ_DMA_STATUS_CTRL_ENABLE); | |
328 | ||
329 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_CTRL, | |
330 | JZ_DMA_CTRL_ENABLE, | |
331 | JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE); | |
7c169a42 LPC |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
25ce6c35 | 336 | static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan) |
7c169a42 | 337 | { |
7c169a42 LPC |
338 | spin_lock(&chan->vchan.lock); |
339 | if (chan->desc) { | |
26f7af37 | 340 | if (chan->desc->cyclic) { |
7c169a42 LPC |
341 | vchan_cyclic_callback(&chan->desc->vdesc); |
342 | } else { | |
343 | if (chan->next_sg == chan->desc->num_sgs) { | |
f498e064 | 344 | list_del(&chan->desc->vdesc.node); |
7c169a42 | 345 | vchan_cookie_complete(&chan->desc->vdesc); |
f498e064 | 346 | chan->desc = NULL; |
7c169a42 LPC |
347 | } |
348 | } | |
349 | } | |
350 | jz4740_dma_start_transfer(chan); | |
351 | spin_unlock(&chan->vchan.lock); | |
352 | } | |
353 | ||
25ce6c35 LPC |
354 | static irqreturn_t jz4740_dma_irq(int irq, void *devid) |
355 | { | |
356 | struct jz4740_dma_dev *dmadev = devid; | |
357 | uint32_t irq_status; | |
358 | unsigned int i; | |
359 | ||
360 | irq_status = readl(dmadev->base + JZ_REG_DMA_IRQ); | |
361 | ||
362 | for (i = 0; i < 6; ++i) { | |
363 | if (irq_status & (1 << i)) { | |
364 | jz4740_dma_write_mask(dmadev, | |
365 | JZ_REG_DMA_STATUS_CTRL(i), 0, | |
366 | JZ_DMA_STATUS_CTRL_ENABLE | | |
367 | JZ_DMA_STATUS_CTRL_TRANSFER_DONE); | |
368 | ||
369 | jz4740_dma_chan_irq(&dmadev->chan[i]); | |
370 | } | |
371 | } | |
372 | ||
373 | return IRQ_HANDLED; | |
374 | } | |
375 | ||
7c169a42 LPC |
376 | static void jz4740_dma_issue_pending(struct dma_chan *c) |
377 | { | |
378 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
379 | unsigned long flags; | |
380 | ||
381 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
382 | if (vchan_issue_pending(&chan->vchan) && !chan->desc) | |
383 | jz4740_dma_start_transfer(chan); | |
384 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
385 | } | |
386 | ||
387 | static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg( | |
388 | struct dma_chan *c, struct scatterlist *sgl, | |
389 | unsigned int sg_len, enum dma_transfer_direction direction, | |
390 | unsigned long flags, void *context) | |
391 | { | |
392 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
393 | struct jz4740_dma_desc *desc; | |
394 | struct scatterlist *sg; | |
395 | unsigned int i; | |
396 | ||
397 | desc = jz4740_dma_alloc_desc(sg_len); | |
398 | if (!desc) | |
399 | return NULL; | |
400 | ||
401 | for_each_sg(sgl, sg, sg_len, i) { | |
402 | desc->sg[i].addr = sg_dma_address(sg); | |
403 | desc->sg[i].len = sg_dma_len(sg); | |
404 | } | |
405 | ||
406 | desc->num_sgs = sg_len; | |
407 | desc->direction = direction; | |
408 | desc->cyclic = false; | |
409 | ||
410 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
411 | } | |
412 | ||
413 | static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic( | |
414 | struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len, | |
415 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 416 | unsigned long flags) |
7c169a42 LPC |
417 | { |
418 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
419 | struct jz4740_dma_desc *desc; | |
420 | unsigned int num_periods, i; | |
421 | ||
422 | if (buf_len % period_len) | |
423 | return NULL; | |
424 | ||
425 | num_periods = buf_len / period_len; | |
426 | ||
427 | desc = jz4740_dma_alloc_desc(num_periods); | |
428 | if (!desc) | |
429 | return NULL; | |
430 | ||
431 | for (i = 0; i < num_periods; i++) { | |
432 | desc->sg[i].addr = buf_addr; | |
433 | desc->sg[i].len = period_len; | |
434 | buf_addr += period_len; | |
435 | } | |
436 | ||
437 | desc->num_sgs = num_periods; | |
438 | desc->direction = direction; | |
439 | desc->cyclic = true; | |
440 | ||
441 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
442 | } | |
443 | ||
444 | static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan, | |
445 | struct jz4740_dma_desc *desc, unsigned int next_sg) | |
446 | { | |
25ce6c35 LPC |
447 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
448 | unsigned int residue, count; | |
7c169a42 LPC |
449 | unsigned int i; |
450 | ||
451 | residue = 0; | |
452 | ||
453 | for (i = next_sg; i < desc->num_sgs; i++) | |
454 | residue += desc->sg[i].len; | |
455 | ||
25ce6c35 LPC |
456 | if (next_sg != 0) { |
457 | count = jz4740_dma_read(dmadev, | |
458 | JZ_REG_DMA_TRANSFER_COUNT(chan->id)); | |
459 | residue += count << chan->transfer_shift; | |
460 | } | |
7c169a42 LPC |
461 | |
462 | return residue; | |
463 | } | |
464 | ||
465 | static enum dma_status jz4740_dma_tx_status(struct dma_chan *c, | |
466 | dma_cookie_t cookie, struct dma_tx_state *state) | |
467 | { | |
468 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
469 | struct virt_dma_desc *vdesc; | |
470 | enum dma_status status; | |
471 | unsigned long flags; | |
472 | ||
473 | status = dma_cookie_status(c, cookie, state); | |
a605c48b | 474 | if (status == DMA_COMPLETE || !state) |
7c169a42 LPC |
475 | return status; |
476 | ||
477 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
478 | vdesc = vchan_find_desc(&chan->vchan, cookie); | |
479 | if (cookie == chan->desc->vdesc.tx.cookie) { | |
480 | state->residue = jz4740_dma_desc_residue(chan, chan->desc, | |
481 | chan->next_sg); | |
482 | } else if (vdesc) { | |
483 | state->residue = jz4740_dma_desc_residue(chan, | |
484 | to_jz4740_dma_desc(vdesc), 0); | |
485 | } else { | |
486 | state->residue = 0; | |
487 | } | |
488 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
489 | ||
490 | return status; | |
491 | } | |
492 | ||
7c169a42 LPC |
493 | static void jz4740_dma_free_chan_resources(struct dma_chan *c) |
494 | { | |
25ce6c35 | 495 | vchan_free_chan_resources(to_virt_chan(c)); |
7c169a42 LPC |
496 | } |
497 | ||
498 | static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc) | |
499 | { | |
500 | kfree(container_of(vdesc, struct jz4740_dma_desc, vdesc)); | |
501 | } | |
502 | ||
ca766839 LPC |
503 | #define JZ4740_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ |
504 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) | |
505 | ||
7c169a42 LPC |
506 | static int jz4740_dma_probe(struct platform_device *pdev) |
507 | { | |
508 | struct jz4740_dmaengine_chan *chan; | |
509 | struct jz4740_dma_dev *dmadev; | |
510 | struct dma_device *dd; | |
511 | unsigned int i; | |
25ce6c35 | 512 | struct resource *res; |
7c169a42 | 513 | int ret; |
25ce6c35 | 514 | int irq; |
7c169a42 LPC |
515 | |
516 | dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL); | |
517 | if (!dmadev) | |
518 | return -EINVAL; | |
519 | ||
520 | dd = &dmadev->ddev; | |
521 | ||
25ce6c35 LPC |
522 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
523 | dmadev->base = devm_ioremap_resource(&pdev->dev, res); | |
524 | if (IS_ERR(dmadev->base)) | |
525 | return PTR_ERR(dmadev->base); | |
526 | ||
527 | dmadev->clk = clk_get(&pdev->dev, "dma"); | |
528 | if (IS_ERR(dmadev->clk)) | |
529 | return PTR_ERR(dmadev->clk); | |
530 | ||
531 | clk_prepare_enable(dmadev->clk); | |
532 | ||
7c169a42 LPC |
533 | dma_cap_set(DMA_SLAVE, dd->cap_mask); |
534 | dma_cap_set(DMA_CYCLIC, dd->cap_mask); | |
7c169a42 LPC |
535 | dd->device_free_chan_resources = jz4740_dma_free_chan_resources; |
536 | dd->device_tx_status = jz4740_dma_tx_status; | |
537 | dd->device_issue_pending = jz4740_dma_issue_pending; | |
538 | dd->device_prep_slave_sg = jz4740_dma_prep_slave_sg; | |
539 | dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic; | |
1d4c0b8c MR |
540 | dd->device_config = jz4740_dma_slave_config; |
541 | dd->device_terminate_all = jz4740_dma_terminate_all; | |
ca766839 LPC |
542 | dd->src_addr_widths = JZ4740_DMA_BUSWIDTHS; |
543 | dd->dst_addr_widths = JZ4740_DMA_BUSWIDTHS; | |
544 | dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
545 | dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; | |
7c169a42 | 546 | dd->dev = &pdev->dev; |
7c169a42 LPC |
547 | INIT_LIST_HEAD(&dd->channels); |
548 | ||
b2c100e0 | 549 | for (i = 0; i < JZ_DMA_NR_CHANS; i++) { |
7c169a42 | 550 | chan = &dmadev->chan[i]; |
25ce6c35 | 551 | chan->id = i; |
7c169a42 LPC |
552 | chan->vchan.desc_free = jz4740_dma_desc_free; |
553 | vchan_init(&chan->vchan, dd); | |
554 | } | |
555 | ||
556 | ret = dma_async_device_register(dd); | |
557 | if (ret) | |
558 | return ret; | |
559 | ||
25ce6c35 LPC |
560 | irq = platform_get_irq(pdev, 0); |
561 | ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev); | |
562 | if (ret) | |
563 | goto err_unregister; | |
564 | ||
7c169a42 LPC |
565 | platform_set_drvdata(pdev, dmadev); |
566 | ||
567 | return 0; | |
25ce6c35 LPC |
568 | |
569 | err_unregister: | |
570 | dma_async_device_unregister(dd); | |
571 | return ret; | |
7c169a42 LPC |
572 | } |
573 | ||
cec9cfa8 VK |
574 | static void jz4740_cleanup_vchan(struct dma_device *dmadev) |
575 | { | |
576 | struct jz4740_dmaengine_chan *chan, *_chan; | |
577 | ||
578 | list_for_each_entry_safe(chan, _chan, | |
579 | &dmadev->channels, vchan.chan.device_node) { | |
580 | list_del(&chan->vchan.chan.device_node); | |
581 | tasklet_kill(&chan->vchan.task); | |
582 | } | |
583 | } | |
584 | ||
585 | ||
7c169a42 LPC |
586 | static int jz4740_dma_remove(struct platform_device *pdev) |
587 | { | |
588 | struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev); | |
25ce6c35 | 589 | int irq = platform_get_irq(pdev, 0); |
7c169a42 | 590 | |
25ce6c35 | 591 | free_irq(irq, dmadev); |
cec9cfa8 VK |
592 | |
593 | jz4740_cleanup_vchan(&dmadev->ddev); | |
7c169a42 | 594 | dma_async_device_unregister(&dmadev->ddev); |
25ce6c35 | 595 | clk_disable_unprepare(dmadev->clk); |
7c169a42 LPC |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static struct platform_driver jz4740_dma_driver = { | |
601 | .probe = jz4740_dma_probe, | |
602 | .remove = jz4740_dma_remove, | |
603 | .driver = { | |
604 | .name = "jz4740-dma", | |
7c169a42 LPC |
605 | }, |
606 | }; | |
607 | module_platform_driver(jz4740_dma_driver); | |
608 | ||
609 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
610 | MODULE_DESCRIPTION("JZ4740 DMA driver"); | |
e2f9922a | 611 | MODULE_LICENSE("GPL v2"); |