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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 | * | |
10 | * You should have received a copy of the GNU General Public License along | |
11 | * with this program; if not, write to the Free Software Foundation, Inc., | |
12 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/dmaengine.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/spinlock.h> | |
25ce6c35 LPC |
25 | #include <linux/irq.h> |
26 | #include <linux/clk.h> | |
7c169a42 LPC |
27 | |
28 | #include <asm/mach-jz4740/dma.h> | |
29 | ||
30 | #include "virt-dma.h" | |
31 | ||
32 | #define JZ_DMA_NR_CHANS 6 | |
33 | ||
25ce6c35 LPC |
34 | #define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20) |
35 | #define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20) | |
36 | #define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20) | |
37 | #define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20) | |
38 | #define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20) | |
39 | #define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20) | |
40 | #define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20) | |
41 | ||
42 | #define JZ_REG_DMA_CTRL 0x300 | |
43 | #define JZ_REG_DMA_IRQ 0x304 | |
44 | #define JZ_REG_DMA_DOORBELL 0x308 | |
45 | #define JZ_REG_DMA_DOORBELL_SET 0x30C | |
46 | ||
47 | #define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31) | |
48 | #define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6) | |
49 | #define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4) | |
50 | #define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3) | |
51 | #define JZ_DMA_STATUS_CTRL_HALT BIT(2) | |
52 | #define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1) | |
53 | #define JZ_DMA_STATUS_CTRL_ENABLE BIT(0) | |
54 | ||
55 | #define JZ_DMA_CMD_SRC_INC BIT(23) | |
56 | #define JZ_DMA_CMD_DST_INC BIT(22) | |
57 | #define JZ_DMA_CMD_RDIL_MASK (0xf << 16) | |
58 | #define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14) | |
59 | #define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12) | |
60 | #define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8) | |
61 | #define JZ_DMA_CMD_BLOCK_MODE BIT(7) | |
62 | #define JZ_DMA_CMD_DESC_VALID BIT(4) | |
63 | #define JZ_DMA_CMD_DESC_VALID_MODE BIT(3) | |
64 | #define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2) | |
65 | #define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1) | |
66 | #define JZ_DMA_CMD_LINK_ENABLE BIT(0) | |
67 | ||
68 | #define JZ_DMA_CMD_FLAGS_OFFSET 22 | |
69 | #define JZ_DMA_CMD_RDIL_OFFSET 16 | |
70 | #define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14 | |
71 | #define JZ_DMA_CMD_DST_WIDTH_OFFSET 12 | |
72 | #define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8 | |
73 | #define JZ_DMA_CMD_MODE_OFFSET 7 | |
74 | ||
75 | #define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8) | |
76 | #define JZ_DMA_CTRL_HALT BIT(3) | |
77 | #define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2) | |
78 | #define JZ_DMA_CTRL_ENABLE BIT(0) | |
79 | ||
80 | enum jz4740_dma_width { | |
81 | JZ4740_DMA_WIDTH_32BIT = 0, | |
82 | JZ4740_DMA_WIDTH_8BIT = 1, | |
83 | JZ4740_DMA_WIDTH_16BIT = 2, | |
84 | }; | |
85 | ||
86 | enum jz4740_dma_transfer_size { | |
87 | JZ4740_DMA_TRANSFER_SIZE_4BYTE = 0, | |
88 | JZ4740_DMA_TRANSFER_SIZE_1BYTE = 1, | |
89 | JZ4740_DMA_TRANSFER_SIZE_2BYTE = 2, | |
90 | JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3, | |
91 | JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4, | |
92 | }; | |
93 | ||
94 | enum jz4740_dma_flags { | |
95 | JZ4740_DMA_SRC_AUTOINC = 0x2, | |
96 | JZ4740_DMA_DST_AUTOINC = 0x1, | |
97 | }; | |
98 | ||
99 | enum jz4740_dma_mode { | |
100 | JZ4740_DMA_MODE_SINGLE = 0, | |
101 | JZ4740_DMA_MODE_BLOCK = 1, | |
102 | }; | |
103 | ||
7c169a42 LPC |
104 | struct jz4740_dma_sg { |
105 | dma_addr_t addr; | |
106 | unsigned int len; | |
107 | }; | |
108 | ||
109 | struct jz4740_dma_desc { | |
110 | struct virt_dma_desc vdesc; | |
111 | ||
112 | enum dma_transfer_direction direction; | |
113 | bool cyclic; | |
114 | ||
115 | unsigned int num_sgs; | |
116 | struct jz4740_dma_sg sg[]; | |
117 | }; | |
118 | ||
119 | struct jz4740_dmaengine_chan { | |
120 | struct virt_dma_chan vchan; | |
25ce6c35 | 121 | unsigned int id; |
7c169a42 LPC |
122 | |
123 | dma_addr_t fifo_addr; | |
25ce6c35 | 124 | unsigned int transfer_shift; |
7c169a42 LPC |
125 | |
126 | struct jz4740_dma_desc *desc; | |
127 | unsigned int next_sg; | |
128 | }; | |
129 | ||
130 | struct jz4740_dma_dev { | |
131 | struct dma_device ddev; | |
25ce6c35 LPC |
132 | void __iomem *base; |
133 | struct clk *clk; | |
7c169a42 LPC |
134 | |
135 | struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS]; | |
136 | }; | |
137 | ||
25ce6c35 LPC |
138 | static struct jz4740_dma_dev *jz4740_dma_chan_get_dev( |
139 | struct jz4740_dmaengine_chan *chan) | |
140 | { | |
141 | return container_of(chan->vchan.chan.device, struct jz4740_dma_dev, | |
142 | ddev); | |
143 | } | |
144 | ||
7c169a42 LPC |
145 | static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c) |
146 | { | |
147 | return container_of(c, struct jz4740_dmaengine_chan, vchan.chan); | |
148 | } | |
149 | ||
150 | static struct jz4740_dma_desc *to_jz4740_dma_desc(struct virt_dma_desc *vdesc) | |
151 | { | |
152 | return container_of(vdesc, struct jz4740_dma_desc, vdesc); | |
153 | } | |
154 | ||
25ce6c35 LPC |
155 | static inline uint32_t jz4740_dma_read(struct jz4740_dma_dev *dmadev, |
156 | unsigned int reg) | |
157 | { | |
158 | return readl(dmadev->base + reg); | |
159 | } | |
160 | ||
161 | static inline void jz4740_dma_write(struct jz4740_dma_dev *dmadev, | |
162 | unsigned reg, uint32_t val) | |
163 | { | |
164 | writel(val, dmadev->base + reg); | |
165 | } | |
166 | ||
167 | static inline void jz4740_dma_write_mask(struct jz4740_dma_dev *dmadev, | |
168 | unsigned int reg, uint32_t val, uint32_t mask) | |
169 | { | |
170 | uint32_t tmp; | |
171 | ||
172 | tmp = jz4740_dma_read(dmadev, reg); | |
173 | tmp &= ~mask; | |
174 | tmp |= val; | |
175 | jz4740_dma_write(dmadev, reg, tmp); | |
176 | } | |
177 | ||
7c169a42 LPC |
178 | static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs) |
179 | { | |
180 | return kzalloc(sizeof(struct jz4740_dma_desc) + | |
181 | sizeof(struct jz4740_dma_sg) * num_sgs, GFP_ATOMIC); | |
182 | } | |
183 | ||
184 | static enum jz4740_dma_width jz4740_dma_width(enum dma_slave_buswidth width) | |
185 | { | |
186 | switch (width) { | |
187 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
188 | return JZ4740_DMA_WIDTH_8BIT; | |
189 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
190 | return JZ4740_DMA_WIDTH_16BIT; | |
191 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
192 | return JZ4740_DMA_WIDTH_32BIT; | |
193 | default: | |
194 | return JZ4740_DMA_WIDTH_32BIT; | |
195 | } | |
196 | } | |
197 | ||
198 | static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst) | |
199 | { | |
200 | if (maxburst <= 1) | |
201 | return JZ4740_DMA_TRANSFER_SIZE_1BYTE; | |
202 | else if (maxburst <= 3) | |
203 | return JZ4740_DMA_TRANSFER_SIZE_2BYTE; | |
204 | else if (maxburst <= 15) | |
205 | return JZ4740_DMA_TRANSFER_SIZE_4BYTE; | |
206 | else if (maxburst <= 31) | |
207 | return JZ4740_DMA_TRANSFER_SIZE_16BYTE; | |
208 | ||
209 | return JZ4740_DMA_TRANSFER_SIZE_32BYTE; | |
210 | } | |
211 | ||
212 | static int jz4740_dma_slave_config(struct dma_chan *c, | |
213 | const struct dma_slave_config *config) | |
214 | { | |
215 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
25ce6c35 LPC |
216 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
217 | enum jz4740_dma_width src_width; | |
218 | enum jz4740_dma_width dst_width; | |
219 | enum jz4740_dma_transfer_size transfer_size; | |
220 | enum jz4740_dma_flags flags; | |
221 | uint32_t cmd; | |
7c169a42 LPC |
222 | |
223 | switch (config->direction) { | |
224 | case DMA_MEM_TO_DEV: | |
25ce6c35 LPC |
225 | flags = JZ4740_DMA_SRC_AUTOINC; |
226 | transfer_size = jz4740_dma_maxburst(config->dst_maxburst); | |
7c169a42 LPC |
227 | chan->fifo_addr = config->dst_addr; |
228 | break; | |
229 | case DMA_DEV_TO_MEM: | |
25ce6c35 LPC |
230 | flags = JZ4740_DMA_DST_AUTOINC; |
231 | transfer_size = jz4740_dma_maxburst(config->src_maxburst); | |
7c169a42 LPC |
232 | chan->fifo_addr = config->src_addr; |
233 | break; | |
234 | default: | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
25ce6c35 LPC |
238 | src_width = jz4740_dma_width(config->src_addr_width); |
239 | dst_width = jz4740_dma_width(config->dst_addr_width); | |
240 | ||
241 | switch (transfer_size) { | |
242 | case JZ4740_DMA_TRANSFER_SIZE_2BYTE: | |
243 | chan->transfer_shift = 1; | |
244 | break; | |
245 | case JZ4740_DMA_TRANSFER_SIZE_4BYTE: | |
246 | chan->transfer_shift = 2; | |
247 | break; | |
248 | case JZ4740_DMA_TRANSFER_SIZE_16BYTE: | |
249 | chan->transfer_shift = 4; | |
250 | break; | |
251 | case JZ4740_DMA_TRANSFER_SIZE_32BYTE: | |
252 | chan->transfer_shift = 5; | |
253 | break; | |
254 | default: | |
255 | chan->transfer_shift = 0; | |
256 | break; | |
257 | } | |
7c169a42 | 258 | |
25ce6c35 LPC |
259 | cmd = flags << JZ_DMA_CMD_FLAGS_OFFSET; |
260 | cmd |= src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET; | |
261 | cmd |= dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET; | |
262 | cmd |= transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET; | |
263 | cmd |= JZ4740_DMA_MODE_SINGLE << JZ_DMA_CMD_MODE_OFFSET; | |
264 | cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE; | |
7c169a42 | 265 | |
25ce6c35 LPC |
266 | jz4740_dma_write(dmadev, JZ_REG_DMA_CMD(chan->id), cmd); |
267 | jz4740_dma_write(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0); | |
268 | jz4740_dma_write(dmadev, JZ_REG_DMA_REQ_TYPE(chan->id), | |
269 | config->slave_id); | |
7c169a42 LPC |
270 | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int jz4740_dma_terminate_all(struct dma_chan *c) | |
275 | { | |
276 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
25ce6c35 | 277 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
7c169a42 LPC |
278 | unsigned long flags; |
279 | LIST_HEAD(head); | |
280 | ||
281 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
25ce6c35 LPC |
282 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, |
283 | JZ_DMA_STATUS_CTRL_ENABLE); | |
7c169a42 LPC |
284 | chan->desc = NULL; |
285 | vchan_get_all_descriptors(&chan->vchan, &head); | |
286 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
287 | ||
288 | vchan_dma_desc_free_list(&chan->vchan, &head); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int jz4740_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
294 | unsigned long arg) | |
295 | { | |
296 | struct dma_slave_config *config = (struct dma_slave_config *)arg; | |
297 | ||
298 | switch (cmd) { | |
299 | case DMA_SLAVE_CONFIG: | |
300 | return jz4740_dma_slave_config(chan, config); | |
301 | case DMA_TERMINATE_ALL: | |
302 | return jz4740_dma_terminate_all(chan); | |
303 | default: | |
304 | return -ENOSYS; | |
305 | } | |
306 | } | |
307 | ||
308 | static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan) | |
309 | { | |
25ce6c35 | 310 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
7c169a42 LPC |
311 | dma_addr_t src_addr, dst_addr; |
312 | struct virt_dma_desc *vdesc; | |
313 | struct jz4740_dma_sg *sg; | |
314 | ||
25ce6c35 LPC |
315 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, |
316 | JZ_DMA_STATUS_CTRL_ENABLE); | |
7c169a42 LPC |
317 | |
318 | if (!chan->desc) { | |
319 | vdesc = vchan_next_desc(&chan->vchan); | |
320 | if (!vdesc) | |
321 | return 0; | |
322 | chan->desc = to_jz4740_dma_desc(vdesc); | |
323 | chan->next_sg = 0; | |
324 | } | |
325 | ||
326 | if (chan->next_sg == chan->desc->num_sgs) | |
327 | chan->next_sg = 0; | |
328 | ||
329 | sg = &chan->desc->sg[chan->next_sg]; | |
330 | ||
331 | if (chan->desc->direction == DMA_MEM_TO_DEV) { | |
332 | src_addr = sg->addr; | |
333 | dst_addr = chan->fifo_addr; | |
334 | } else { | |
335 | src_addr = chan->fifo_addr; | |
336 | dst_addr = sg->addr; | |
337 | } | |
25ce6c35 LPC |
338 | jz4740_dma_write(dmadev, JZ_REG_DMA_SRC_ADDR(chan->id), src_addr); |
339 | jz4740_dma_write(dmadev, JZ_REG_DMA_DST_ADDR(chan->id), dst_addr); | |
340 | jz4740_dma_write(dmadev, JZ_REG_DMA_TRANSFER_COUNT(chan->id), | |
341 | sg->len >> chan->transfer_shift); | |
7c169a42 LPC |
342 | |
343 | chan->next_sg++; | |
344 | ||
25ce6c35 LPC |
345 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), |
346 | JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE, | |
347 | JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC | | |
348 | JZ_DMA_STATUS_CTRL_ENABLE); | |
349 | ||
350 | jz4740_dma_write_mask(dmadev, JZ_REG_DMA_CTRL, | |
351 | JZ_DMA_CTRL_ENABLE, | |
352 | JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE); | |
7c169a42 LPC |
353 | |
354 | return 0; | |
355 | } | |
356 | ||
25ce6c35 | 357 | static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan) |
7c169a42 | 358 | { |
7c169a42 LPC |
359 | spin_lock(&chan->vchan.lock); |
360 | if (chan->desc) { | |
361 | if (chan->desc && chan->desc->cyclic) { | |
362 | vchan_cyclic_callback(&chan->desc->vdesc); | |
363 | } else { | |
364 | if (chan->next_sg == chan->desc->num_sgs) { | |
365 | chan->desc = NULL; | |
366 | vchan_cookie_complete(&chan->desc->vdesc); | |
367 | } | |
368 | } | |
369 | } | |
370 | jz4740_dma_start_transfer(chan); | |
371 | spin_unlock(&chan->vchan.lock); | |
372 | } | |
373 | ||
25ce6c35 LPC |
374 | static irqreturn_t jz4740_dma_irq(int irq, void *devid) |
375 | { | |
376 | struct jz4740_dma_dev *dmadev = devid; | |
377 | uint32_t irq_status; | |
378 | unsigned int i; | |
379 | ||
380 | irq_status = readl(dmadev->base + JZ_REG_DMA_IRQ); | |
381 | ||
382 | for (i = 0; i < 6; ++i) { | |
383 | if (irq_status & (1 << i)) { | |
384 | jz4740_dma_write_mask(dmadev, | |
385 | JZ_REG_DMA_STATUS_CTRL(i), 0, | |
386 | JZ_DMA_STATUS_CTRL_ENABLE | | |
387 | JZ_DMA_STATUS_CTRL_TRANSFER_DONE); | |
388 | ||
389 | jz4740_dma_chan_irq(&dmadev->chan[i]); | |
390 | } | |
391 | } | |
392 | ||
393 | return IRQ_HANDLED; | |
394 | } | |
395 | ||
7c169a42 LPC |
396 | static void jz4740_dma_issue_pending(struct dma_chan *c) |
397 | { | |
398 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
399 | unsigned long flags; | |
400 | ||
401 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
402 | if (vchan_issue_pending(&chan->vchan) && !chan->desc) | |
403 | jz4740_dma_start_transfer(chan); | |
404 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
405 | } | |
406 | ||
407 | static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg( | |
408 | struct dma_chan *c, struct scatterlist *sgl, | |
409 | unsigned int sg_len, enum dma_transfer_direction direction, | |
410 | unsigned long flags, void *context) | |
411 | { | |
412 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
413 | struct jz4740_dma_desc *desc; | |
414 | struct scatterlist *sg; | |
415 | unsigned int i; | |
416 | ||
417 | desc = jz4740_dma_alloc_desc(sg_len); | |
418 | if (!desc) | |
419 | return NULL; | |
420 | ||
421 | for_each_sg(sgl, sg, sg_len, i) { | |
422 | desc->sg[i].addr = sg_dma_address(sg); | |
423 | desc->sg[i].len = sg_dma_len(sg); | |
424 | } | |
425 | ||
426 | desc->num_sgs = sg_len; | |
427 | desc->direction = direction; | |
428 | desc->cyclic = false; | |
429 | ||
430 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
431 | } | |
432 | ||
433 | static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic( | |
434 | struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len, | |
435 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 436 | unsigned long flags) |
7c169a42 LPC |
437 | { |
438 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
439 | struct jz4740_dma_desc *desc; | |
440 | unsigned int num_periods, i; | |
441 | ||
442 | if (buf_len % period_len) | |
443 | return NULL; | |
444 | ||
445 | num_periods = buf_len / period_len; | |
446 | ||
447 | desc = jz4740_dma_alloc_desc(num_periods); | |
448 | if (!desc) | |
449 | return NULL; | |
450 | ||
451 | for (i = 0; i < num_periods; i++) { | |
452 | desc->sg[i].addr = buf_addr; | |
453 | desc->sg[i].len = period_len; | |
454 | buf_addr += period_len; | |
455 | } | |
456 | ||
457 | desc->num_sgs = num_periods; | |
458 | desc->direction = direction; | |
459 | desc->cyclic = true; | |
460 | ||
461 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
462 | } | |
463 | ||
464 | static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan, | |
465 | struct jz4740_dma_desc *desc, unsigned int next_sg) | |
466 | { | |
25ce6c35 LPC |
467 | struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); |
468 | unsigned int residue, count; | |
7c169a42 LPC |
469 | unsigned int i; |
470 | ||
471 | residue = 0; | |
472 | ||
473 | for (i = next_sg; i < desc->num_sgs; i++) | |
474 | residue += desc->sg[i].len; | |
475 | ||
25ce6c35 LPC |
476 | if (next_sg != 0) { |
477 | count = jz4740_dma_read(dmadev, | |
478 | JZ_REG_DMA_TRANSFER_COUNT(chan->id)); | |
479 | residue += count << chan->transfer_shift; | |
480 | } | |
7c169a42 LPC |
481 | |
482 | return residue; | |
483 | } | |
484 | ||
485 | static enum dma_status jz4740_dma_tx_status(struct dma_chan *c, | |
486 | dma_cookie_t cookie, struct dma_tx_state *state) | |
487 | { | |
488 | struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); | |
489 | struct virt_dma_desc *vdesc; | |
490 | enum dma_status status; | |
491 | unsigned long flags; | |
492 | ||
493 | status = dma_cookie_status(c, cookie, state); | |
a605c48b | 494 | if (status == DMA_COMPLETE || !state) |
7c169a42 LPC |
495 | return status; |
496 | ||
497 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
498 | vdesc = vchan_find_desc(&chan->vchan, cookie); | |
499 | if (cookie == chan->desc->vdesc.tx.cookie) { | |
500 | state->residue = jz4740_dma_desc_residue(chan, chan->desc, | |
501 | chan->next_sg); | |
502 | } else if (vdesc) { | |
503 | state->residue = jz4740_dma_desc_residue(chan, | |
504 | to_jz4740_dma_desc(vdesc), 0); | |
505 | } else { | |
506 | state->residue = 0; | |
507 | } | |
508 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
509 | ||
510 | return status; | |
511 | } | |
512 | ||
513 | static int jz4740_dma_alloc_chan_resources(struct dma_chan *c) | |
514 | { | |
7c169a42 LPC |
515 | return 0; |
516 | } | |
517 | ||
518 | static void jz4740_dma_free_chan_resources(struct dma_chan *c) | |
519 | { | |
25ce6c35 | 520 | vchan_free_chan_resources(to_virt_chan(c)); |
7c169a42 LPC |
521 | } |
522 | ||
523 | static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc) | |
524 | { | |
525 | kfree(container_of(vdesc, struct jz4740_dma_desc, vdesc)); | |
526 | } | |
527 | ||
528 | static int jz4740_dma_probe(struct platform_device *pdev) | |
529 | { | |
530 | struct jz4740_dmaengine_chan *chan; | |
531 | struct jz4740_dma_dev *dmadev; | |
532 | struct dma_device *dd; | |
533 | unsigned int i; | |
25ce6c35 | 534 | struct resource *res; |
7c169a42 | 535 | int ret; |
25ce6c35 | 536 | int irq; |
7c169a42 LPC |
537 | |
538 | dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL); | |
539 | if (!dmadev) | |
540 | return -EINVAL; | |
541 | ||
542 | dd = &dmadev->ddev; | |
543 | ||
25ce6c35 LPC |
544 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
545 | dmadev->base = devm_ioremap_resource(&pdev->dev, res); | |
546 | if (IS_ERR(dmadev->base)) | |
547 | return PTR_ERR(dmadev->base); | |
548 | ||
549 | dmadev->clk = clk_get(&pdev->dev, "dma"); | |
550 | if (IS_ERR(dmadev->clk)) | |
551 | return PTR_ERR(dmadev->clk); | |
552 | ||
553 | clk_prepare_enable(dmadev->clk); | |
554 | ||
7c169a42 LPC |
555 | dma_cap_set(DMA_SLAVE, dd->cap_mask); |
556 | dma_cap_set(DMA_CYCLIC, dd->cap_mask); | |
557 | dd->device_alloc_chan_resources = jz4740_dma_alloc_chan_resources; | |
558 | dd->device_free_chan_resources = jz4740_dma_free_chan_resources; | |
559 | dd->device_tx_status = jz4740_dma_tx_status; | |
560 | dd->device_issue_pending = jz4740_dma_issue_pending; | |
561 | dd->device_prep_slave_sg = jz4740_dma_prep_slave_sg; | |
562 | dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic; | |
563 | dd->device_control = jz4740_dma_control; | |
564 | dd->dev = &pdev->dev; | |
565 | dd->chancnt = JZ_DMA_NR_CHANS; | |
566 | INIT_LIST_HEAD(&dd->channels); | |
567 | ||
568 | for (i = 0; i < dd->chancnt; i++) { | |
569 | chan = &dmadev->chan[i]; | |
25ce6c35 | 570 | chan->id = i; |
7c169a42 LPC |
571 | chan->vchan.desc_free = jz4740_dma_desc_free; |
572 | vchan_init(&chan->vchan, dd); | |
573 | } | |
574 | ||
575 | ret = dma_async_device_register(dd); | |
576 | if (ret) | |
577 | return ret; | |
578 | ||
25ce6c35 LPC |
579 | irq = platform_get_irq(pdev, 0); |
580 | ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev); | |
581 | if (ret) | |
582 | goto err_unregister; | |
583 | ||
7c169a42 LPC |
584 | platform_set_drvdata(pdev, dmadev); |
585 | ||
586 | return 0; | |
25ce6c35 LPC |
587 | |
588 | err_unregister: | |
589 | dma_async_device_unregister(dd); | |
590 | return ret; | |
7c169a42 LPC |
591 | } |
592 | ||
593 | static int jz4740_dma_remove(struct platform_device *pdev) | |
594 | { | |
595 | struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev); | |
25ce6c35 | 596 | int irq = platform_get_irq(pdev, 0); |
7c169a42 | 597 | |
25ce6c35 | 598 | free_irq(irq, dmadev); |
7c169a42 | 599 | dma_async_device_unregister(&dmadev->ddev); |
25ce6c35 | 600 | clk_disable_unprepare(dmadev->clk); |
7c169a42 LPC |
601 | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static struct platform_driver jz4740_dma_driver = { | |
606 | .probe = jz4740_dma_probe, | |
607 | .remove = jz4740_dma_remove, | |
608 | .driver = { | |
609 | .name = "jz4740-dma", | |
610 | .owner = THIS_MODULE, | |
611 | }, | |
612 | }; | |
613 | module_platform_driver(jz4740_dma_driver); | |
614 | ||
615 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
616 | MODULE_DESCRIPTION("JZ4740 DMA driver"); | |
e2f9922a | 617 | MODULE_LICENSE("GPL v2"); |