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d8b46839 CM |
1 | /* |
2 | * Driver for STM32 DMA controller | |
3 | * | |
4 | * Inspired by dma-jz4740.c and tegra20-apb-dma.c | |
5 | * | |
6 | * Copyright (C) M'boumba Cedric Madianga 2015 | |
7 | * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com> | |
a2b6103b | 8 | * Pierre-Yves Mordret <pierre-yves.mordret@st.com> |
d8b46839 CM |
9 | * |
10 | * License terms: GNU General Public License (GPL), version 2 | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
24 | #include <linux/of_dma.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/reset.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include "virt-dma.h" | |
31 | ||
32 | #define STM32_DMA_LISR 0x0000 /* DMA Low Int Status Reg */ | |
33 | #define STM32_DMA_HISR 0x0004 /* DMA High Int Status Reg */ | |
34 | #define STM32_DMA_LIFCR 0x0008 /* DMA Low Int Flag Clear Reg */ | |
35 | #define STM32_DMA_HIFCR 0x000c /* DMA High Int Flag Clear Reg */ | |
36 | #define STM32_DMA_TCI BIT(5) /* Transfer Complete Interrupt */ | |
c2d86b1c | 37 | #define STM32_DMA_HTI BIT(4) /* Half Transfer Interrupt */ |
d8b46839 CM |
38 | #define STM32_DMA_TEI BIT(3) /* Transfer Error Interrupt */ |
39 | #define STM32_DMA_DMEI BIT(2) /* Direct Mode Error Interrupt */ | |
40 | #define STM32_DMA_FEI BIT(0) /* FIFO Error Interrupt */ | |
9df3bd55 PYM |
41 | #define STM32_DMA_MASKI (STM32_DMA_TCI \ |
42 | | STM32_DMA_TEI \ | |
43 | | STM32_DMA_DMEI \ | |
44 | | STM32_DMA_FEI) | |
d8b46839 CM |
45 | |
46 | /* DMA Stream x Configuration Register */ | |
47 | #define STM32_DMA_SCR(x) (0x0010 + 0x18 * (x)) /* x = 0..7 */ | |
48 | #define STM32_DMA_SCR_REQ(n) ((n & 0x7) << 25) | |
49 | #define STM32_DMA_SCR_MBURST_MASK GENMASK(24, 23) | |
50 | #define STM32_DMA_SCR_MBURST(n) ((n & 0x3) << 23) | |
51 | #define STM32_DMA_SCR_PBURST_MASK GENMASK(22, 21) | |
52 | #define STM32_DMA_SCR_PBURST(n) ((n & 0x3) << 21) | |
53 | #define STM32_DMA_SCR_PL_MASK GENMASK(17, 16) | |
54 | #define STM32_DMA_SCR_PL(n) ((n & 0x3) << 16) | |
55 | #define STM32_DMA_SCR_MSIZE_MASK GENMASK(14, 13) | |
56 | #define STM32_DMA_SCR_MSIZE(n) ((n & 0x3) << 13) | |
57 | #define STM32_DMA_SCR_PSIZE_MASK GENMASK(12, 11) | |
58 | #define STM32_DMA_SCR_PSIZE(n) ((n & 0x3) << 11) | |
59 | #define STM32_DMA_SCR_PSIZE_GET(n) ((n & STM32_DMA_SCR_PSIZE_MASK) >> 11) | |
60 | #define STM32_DMA_SCR_DIR_MASK GENMASK(7, 6) | |
61 | #define STM32_DMA_SCR_DIR(n) ((n & 0x3) << 6) | |
62 | #define STM32_DMA_SCR_CT BIT(19) /* Target in double buffer */ | |
63 | #define STM32_DMA_SCR_DBM BIT(18) /* Double Buffer Mode */ | |
64 | #define STM32_DMA_SCR_PINCOS BIT(15) /* Peripheral inc offset size */ | |
65 | #define STM32_DMA_SCR_MINC BIT(10) /* Memory increment mode */ | |
66 | #define STM32_DMA_SCR_PINC BIT(9) /* Peripheral increment mode */ | |
67 | #define STM32_DMA_SCR_CIRC BIT(8) /* Circular mode */ | |
68 | #define STM32_DMA_SCR_PFCTRL BIT(5) /* Peripheral Flow Controller */ | |
249d5531 PYM |
69 | #define STM32_DMA_SCR_TCIE BIT(4) /* Transfer Complete Int Enable |
70 | */ | |
d8b46839 CM |
71 | #define STM32_DMA_SCR_TEIE BIT(2) /* Transfer Error Int Enable */ |
72 | #define STM32_DMA_SCR_DMEIE BIT(1) /* Direct Mode Err Int Enable */ | |
73 | #define STM32_DMA_SCR_EN BIT(0) /* Stream Enable */ | |
74 | #define STM32_DMA_SCR_CFG_MASK (STM32_DMA_SCR_PINC \ | |
75 | | STM32_DMA_SCR_MINC \ | |
76 | | STM32_DMA_SCR_PINCOS \ | |
77 | | STM32_DMA_SCR_PL_MASK) | |
78 | #define STM32_DMA_SCR_IRQ_MASK (STM32_DMA_SCR_TCIE \ | |
79 | | STM32_DMA_SCR_TEIE \ | |
80 | | STM32_DMA_SCR_DMEIE) | |
81 | ||
82 | /* DMA Stream x number of data register */ | |
83 | #define STM32_DMA_SNDTR(x) (0x0014 + 0x18 * (x)) | |
84 | ||
85 | /* DMA stream peripheral address register */ | |
86 | #define STM32_DMA_SPAR(x) (0x0018 + 0x18 * (x)) | |
87 | ||
88 | /* DMA stream x memory 0 address register */ | |
89 | #define STM32_DMA_SM0AR(x) (0x001c + 0x18 * (x)) | |
90 | ||
91 | /* DMA stream x memory 1 address register */ | |
92 | #define STM32_DMA_SM1AR(x) (0x0020 + 0x18 * (x)) | |
93 | ||
94 | /* DMA stream x FIFO control register */ | |
95 | #define STM32_DMA_SFCR(x) (0x0024 + 0x18 * (x)) | |
96 | #define STM32_DMA_SFCR_FTH_MASK GENMASK(1, 0) | |
97 | #define STM32_DMA_SFCR_FTH(n) (n & STM32_DMA_SFCR_FTH_MASK) | |
98 | #define STM32_DMA_SFCR_FEIE BIT(7) /* FIFO error interrupt enable */ | |
99 | #define STM32_DMA_SFCR_DMDIS BIT(2) /* Direct mode disable */ | |
100 | #define STM32_DMA_SFCR_MASK (STM32_DMA_SFCR_FEIE \ | |
101 | | STM32_DMA_SFCR_DMDIS) | |
102 | ||
103 | /* DMA direction */ | |
104 | #define STM32_DMA_DEV_TO_MEM 0x00 | |
105 | #define STM32_DMA_MEM_TO_DEV 0x01 | |
106 | #define STM32_DMA_MEM_TO_MEM 0x02 | |
107 | ||
108 | /* DMA priority level */ | |
109 | #define STM32_DMA_PRIORITY_LOW 0x00 | |
110 | #define STM32_DMA_PRIORITY_MEDIUM 0x01 | |
111 | #define STM32_DMA_PRIORITY_HIGH 0x02 | |
112 | #define STM32_DMA_PRIORITY_VERY_HIGH 0x03 | |
113 | ||
114 | /* DMA FIFO threshold selection */ | |
115 | #define STM32_DMA_FIFO_THRESHOLD_1QUARTERFULL 0x00 | |
116 | #define STM32_DMA_FIFO_THRESHOLD_HALFFULL 0x01 | |
117 | #define STM32_DMA_FIFO_THRESHOLD_3QUARTERSFULL 0x02 | |
118 | #define STM32_DMA_FIFO_THRESHOLD_FULL 0x03 | |
119 | ||
120 | #define STM32_DMA_MAX_DATA_ITEMS 0xffff | |
80a76952 PYM |
121 | /* |
122 | * Valid transfer starts from @0 to @0xFFFE leading to unaligned scatter | |
123 | * gather at boundary. Thus it's safer to round down this value on FIFO | |
124 | * size (16 Bytes) | |
125 | */ | |
126 | #define STM32_DMA_ALIGNED_MAX_DATA_ITEMS \ | |
127 | ALIGN_DOWN(STM32_DMA_MAX_DATA_ITEMS, 16) | |
d8b46839 CM |
128 | #define STM32_DMA_MAX_CHANNELS 0x08 |
129 | #define STM32_DMA_MAX_REQUEST_ID 0x08 | |
130 | #define STM32_DMA_MAX_DATA_PARAM 0x03 | |
a2b6103b PYM |
131 | #define STM32_DMA_FIFO_SIZE 16 /* FIFO is 16 bytes */ |
132 | #define STM32_DMA_MIN_BURST 4 | |
276b0046 | 133 | #define STM32_DMA_MAX_BURST 16 |
d8b46839 | 134 | |
951f44cb PYM |
135 | /* DMA Features */ |
136 | #define STM32_DMA_THRESHOLD_FTR_MASK GENMASK(1, 0) | |
137 | #define STM32_DMA_THRESHOLD_FTR_GET(n) ((n) & STM32_DMA_THRESHOLD_FTR_MASK) | |
138 | ||
d8b46839 CM |
139 | enum stm32_dma_width { |
140 | STM32_DMA_BYTE, | |
141 | STM32_DMA_HALF_WORD, | |
142 | STM32_DMA_WORD, | |
143 | }; | |
144 | ||
145 | enum stm32_dma_burst_size { | |
146 | STM32_DMA_BURST_SINGLE, | |
147 | STM32_DMA_BURST_INCR4, | |
148 | STM32_DMA_BURST_INCR8, | |
149 | STM32_DMA_BURST_INCR16, | |
150 | }; | |
151 | ||
951f44cb PYM |
152 | /** |
153 | * struct stm32_dma_cfg - STM32 DMA custom configuration | |
154 | * @channel_id: channel ID | |
155 | * @request_line: DMA request | |
156 | * @stream_config: 32bit mask specifying the DMA channel configuration | |
157 | * @features: 32bit mask specifying the DMA Feature list | |
158 | */ | |
d8b46839 CM |
159 | struct stm32_dma_cfg { |
160 | u32 channel_id; | |
161 | u32 request_line; | |
162 | u32 stream_config; | |
951f44cb | 163 | u32 features; |
d8b46839 CM |
164 | }; |
165 | ||
166 | struct stm32_dma_chan_reg { | |
167 | u32 dma_lisr; | |
168 | u32 dma_hisr; | |
169 | u32 dma_lifcr; | |
170 | u32 dma_hifcr; | |
171 | u32 dma_scr; | |
172 | u32 dma_sndtr; | |
173 | u32 dma_spar; | |
174 | u32 dma_sm0ar; | |
175 | u32 dma_sm1ar; | |
176 | u32 dma_sfcr; | |
177 | }; | |
178 | ||
179 | struct stm32_dma_sg_req { | |
180 | u32 len; | |
181 | struct stm32_dma_chan_reg chan_reg; | |
182 | }; | |
183 | ||
184 | struct stm32_dma_desc { | |
185 | struct virt_dma_desc vdesc; | |
186 | bool cyclic; | |
187 | u32 num_sgs; | |
188 | struct stm32_dma_sg_req sg_req[]; | |
189 | }; | |
190 | ||
191 | struct stm32_dma_chan { | |
192 | struct virt_dma_chan vchan; | |
193 | bool config_init; | |
194 | bool busy; | |
195 | u32 id; | |
196 | u32 irq; | |
197 | struct stm32_dma_desc *desc; | |
198 | u32 next_sg; | |
199 | struct dma_slave_config dma_sconfig; | |
200 | struct stm32_dma_chan_reg chan_reg; | |
951f44cb | 201 | u32 threshold; |
a2b6103b PYM |
202 | u32 mem_burst; |
203 | u32 mem_width; | |
d8b46839 CM |
204 | }; |
205 | ||
206 | struct stm32_dma_device { | |
207 | struct dma_device ddev; | |
208 | void __iomem *base; | |
209 | struct clk *clk; | |
210 | struct reset_control *rst; | |
211 | bool mem2mem; | |
212 | struct stm32_dma_chan chan[STM32_DMA_MAX_CHANNELS]; | |
213 | }; | |
214 | ||
215 | static struct stm32_dma_device *stm32_dma_get_dev(struct stm32_dma_chan *chan) | |
216 | { | |
217 | return container_of(chan->vchan.chan.device, struct stm32_dma_device, | |
218 | ddev); | |
219 | } | |
220 | ||
221 | static struct stm32_dma_chan *to_stm32_dma_chan(struct dma_chan *c) | |
222 | { | |
223 | return container_of(c, struct stm32_dma_chan, vchan.chan); | |
224 | } | |
225 | ||
226 | static struct stm32_dma_desc *to_stm32_dma_desc(struct virt_dma_desc *vdesc) | |
227 | { | |
228 | return container_of(vdesc, struct stm32_dma_desc, vdesc); | |
229 | } | |
230 | ||
231 | static struct device *chan2dev(struct stm32_dma_chan *chan) | |
232 | { | |
233 | return &chan->vchan.chan.dev->device; | |
234 | } | |
235 | ||
236 | static u32 stm32_dma_read(struct stm32_dma_device *dmadev, u32 reg) | |
237 | { | |
238 | return readl_relaxed(dmadev->base + reg); | |
239 | } | |
240 | ||
241 | static void stm32_dma_write(struct stm32_dma_device *dmadev, u32 reg, u32 val) | |
242 | { | |
243 | writel_relaxed(val, dmadev->base + reg); | |
244 | } | |
245 | ||
246 | static struct stm32_dma_desc *stm32_dma_alloc_desc(u32 num_sgs) | |
247 | { | |
248 | return kzalloc(sizeof(struct stm32_dma_desc) + | |
249 | sizeof(struct stm32_dma_sg_req) * num_sgs, GFP_NOWAIT); | |
250 | } | |
251 | ||
252 | static int stm32_dma_get_width(struct stm32_dma_chan *chan, | |
253 | enum dma_slave_buswidth width) | |
254 | { | |
255 | switch (width) { | |
256 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
257 | return STM32_DMA_BYTE; | |
258 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
259 | return STM32_DMA_HALF_WORD; | |
260 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
261 | return STM32_DMA_WORD; | |
262 | default: | |
263 | dev_err(chan2dev(chan), "Dma bus width not supported\n"); | |
264 | return -EINVAL; | |
265 | } | |
266 | } | |
267 | ||
a2b6103b PYM |
268 | static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len, |
269 | u32 threshold) | |
270 | { | |
271 | enum dma_slave_buswidth max_width; | |
272 | ||
273 | if (threshold == STM32_DMA_FIFO_THRESHOLD_FULL) | |
274 | max_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
275 | else | |
276 | max_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
277 | ||
278 | while ((buf_len < max_width || buf_len % max_width) && | |
279 | max_width > DMA_SLAVE_BUSWIDTH_1_BYTE) | |
280 | max_width = max_width >> 1; | |
281 | ||
282 | return max_width; | |
283 | } | |
284 | ||
285 | static bool stm32_dma_fifo_threshold_is_allowed(u32 burst, u32 threshold, | |
286 | enum dma_slave_buswidth width) | |
287 | { | |
288 | u32 remaining; | |
289 | ||
290 | if (width != DMA_SLAVE_BUSWIDTH_UNDEFINED) { | |
291 | if (burst != 0) { | |
292 | /* | |
293 | * If number of beats fit in several whole bursts | |
294 | * this configuration is allowed. | |
295 | */ | |
296 | remaining = ((STM32_DMA_FIFO_SIZE / width) * | |
297 | (threshold + 1) / 4) % burst; | |
298 | ||
299 | if (remaining == 0) | |
300 | return true; | |
301 | } else { | |
302 | return true; | |
303 | } | |
304 | } | |
305 | ||
306 | return false; | |
307 | } | |
308 | ||
309 | static bool stm32_dma_is_burst_possible(u32 buf_len, u32 threshold) | |
310 | { | |
cc832dc8 PYM |
311 | /* |
312 | * Buffer or period length has to be aligned on FIFO depth. | |
313 | * Otherwise bytes may be stuck within FIFO at buffer or period | |
314 | * length. | |
315 | */ | |
316 | return ((buf_len % ((threshold + 1) * 4)) == 0); | |
a2b6103b PYM |
317 | } |
318 | ||
319 | static u32 stm32_dma_get_best_burst(u32 buf_len, u32 max_burst, u32 threshold, | |
320 | enum dma_slave_buswidth width) | |
321 | { | |
322 | u32 best_burst = max_burst; | |
323 | ||
324 | if (best_burst == 1 || !stm32_dma_is_burst_possible(buf_len, threshold)) | |
325 | return 0; | |
326 | ||
327 | while ((buf_len < best_burst * width && best_burst > 1) || | |
328 | !stm32_dma_fifo_threshold_is_allowed(best_burst, threshold, | |
329 | width)) { | |
330 | if (best_burst > STM32_DMA_MIN_BURST) | |
331 | best_burst = best_burst >> 1; | |
332 | else | |
333 | best_burst = 0; | |
334 | } | |
335 | ||
336 | return best_burst; | |
337 | } | |
338 | ||
d8b46839 CM |
339 | static int stm32_dma_get_burst(struct stm32_dma_chan *chan, u32 maxburst) |
340 | { | |
341 | switch (maxburst) { | |
342 | case 0: | |
343 | case 1: | |
344 | return STM32_DMA_BURST_SINGLE; | |
345 | case 4: | |
346 | return STM32_DMA_BURST_INCR4; | |
347 | case 8: | |
348 | return STM32_DMA_BURST_INCR8; | |
349 | case 16: | |
350 | return STM32_DMA_BURST_INCR16; | |
351 | default: | |
352 | dev_err(chan2dev(chan), "Dma burst size not supported\n"); | |
353 | return -EINVAL; | |
354 | } | |
355 | } | |
356 | ||
357 | static void stm32_dma_set_fifo_config(struct stm32_dma_chan *chan, | |
a2b6103b | 358 | u32 src_burst, u32 dst_burst) |
d8b46839 CM |
359 | { |
360 | chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_MASK; | |
361 | chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_DMEIE; | |
362 | ||
a2b6103b | 363 | if (!src_burst && !dst_burst) { |
d8b46839 CM |
364 | /* Using direct mode */ |
365 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_DMEIE; | |
366 | } else { | |
367 | /* Using FIFO mode */ | |
368 | chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK; | |
369 | } | |
370 | } | |
371 | ||
372 | static int stm32_dma_slave_config(struct dma_chan *c, | |
373 | struct dma_slave_config *config) | |
374 | { | |
375 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
376 | ||
377 | memcpy(&chan->dma_sconfig, config, sizeof(*config)); | |
378 | ||
379 | chan->config_init = true; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static u32 stm32_dma_irq_status(struct stm32_dma_chan *chan) | |
385 | { | |
386 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
387 | u32 flags, dma_isr; | |
388 | ||
389 | /* | |
390 | * Read "flags" from DMA_xISR register corresponding to the selected | |
391 | * DMA channel at the correct bit offset inside that register. | |
392 | * | |
393 | * If (ch % 4) is 2 or 3, left shift the mask by 16 bits. | |
394 | * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits. | |
395 | */ | |
396 | ||
397 | if (chan->id & 4) | |
398 | dma_isr = stm32_dma_read(dmadev, STM32_DMA_HISR); | |
399 | else | |
400 | dma_isr = stm32_dma_read(dmadev, STM32_DMA_LISR); | |
401 | ||
402 | flags = dma_isr >> (((chan->id & 2) << 3) | ((chan->id & 1) * 6)); | |
403 | ||
9df3bd55 | 404 | return flags & STM32_DMA_MASKI; |
d8b46839 CM |
405 | } |
406 | ||
407 | static void stm32_dma_irq_clear(struct stm32_dma_chan *chan, u32 flags) | |
408 | { | |
409 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
410 | u32 dma_ifcr; | |
411 | ||
412 | /* | |
413 | * Write "flags" to the DMA_xIFCR register corresponding to the selected | |
414 | * DMA channel at the correct bit offset inside that register. | |
415 | * | |
416 | * If (ch % 4) is 2 or 3, left shift the mask by 16 bits. | |
417 | * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits. | |
418 | */ | |
9df3bd55 | 419 | flags &= STM32_DMA_MASKI; |
d8b46839 CM |
420 | dma_ifcr = flags << (((chan->id & 2) << 3) | ((chan->id & 1) * 6)); |
421 | ||
422 | if (chan->id & 4) | |
423 | stm32_dma_write(dmadev, STM32_DMA_HIFCR, dma_ifcr); | |
424 | else | |
425 | stm32_dma_write(dmadev, STM32_DMA_LIFCR, dma_ifcr); | |
426 | } | |
427 | ||
428 | static int stm32_dma_disable_chan(struct stm32_dma_chan *chan) | |
429 | { | |
430 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
431 | unsigned long timeout = jiffies + msecs_to_jiffies(5000); | |
432 | u32 dma_scr, id; | |
433 | ||
434 | id = chan->id; | |
435 | dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id)); | |
436 | ||
437 | if (dma_scr & STM32_DMA_SCR_EN) { | |
438 | dma_scr &= ~STM32_DMA_SCR_EN; | |
439 | stm32_dma_write(dmadev, STM32_DMA_SCR(id), dma_scr); | |
440 | ||
441 | do { | |
442 | dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id)); | |
443 | dma_scr &= STM32_DMA_SCR_EN; | |
444 | if (!dma_scr) | |
445 | break; | |
446 | ||
447 | if (time_after_eq(jiffies, timeout)) { | |
448 | dev_err(chan2dev(chan), "%s: timeout!\n", | |
449 | __func__); | |
450 | return -EBUSY; | |
451 | } | |
452 | cond_resched(); | |
453 | } while (1); | |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static void stm32_dma_stop(struct stm32_dma_chan *chan) | |
460 | { | |
461 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
462 | u32 dma_scr, dma_sfcr, status; | |
463 | int ret; | |
464 | ||
465 | /* Disable interrupts */ | |
466 | dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id)); | |
467 | dma_scr &= ~STM32_DMA_SCR_IRQ_MASK; | |
468 | stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr); | |
469 | dma_sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id)); | |
470 | dma_sfcr &= ~STM32_DMA_SFCR_FEIE; | |
471 | stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), dma_sfcr); | |
472 | ||
473 | /* Disable DMA */ | |
474 | ret = stm32_dma_disable_chan(chan); | |
475 | if (ret < 0) | |
476 | return; | |
477 | ||
478 | /* Clear interrupt status if it is there */ | |
479 | status = stm32_dma_irq_status(chan); | |
480 | if (status) { | |
481 | dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n", | |
482 | __func__, status); | |
483 | stm32_dma_irq_clear(chan, status); | |
484 | } | |
485 | ||
486 | chan->busy = false; | |
487 | } | |
488 | ||
489 | static int stm32_dma_terminate_all(struct dma_chan *c) | |
490 | { | |
491 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
492 | unsigned long flags; | |
493 | LIST_HEAD(head); | |
494 | ||
495 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
496 | ||
497 | if (chan->busy) { | |
498 | stm32_dma_stop(chan); | |
499 | chan->desc = NULL; | |
500 | } | |
501 | ||
502 | vchan_get_all_descriptors(&chan->vchan, &head); | |
503 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
504 | vchan_dma_desc_free_list(&chan->vchan, &head); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
dc808675 CM |
509 | static void stm32_dma_synchronize(struct dma_chan *c) |
510 | { | |
511 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
512 | ||
513 | vchan_synchronize(&chan->vchan); | |
514 | } | |
515 | ||
d8b46839 CM |
516 | static void stm32_dma_dump_reg(struct stm32_dma_chan *chan) |
517 | { | |
518 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
519 | u32 scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id)); | |
520 | u32 ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id)); | |
521 | u32 spar = stm32_dma_read(dmadev, STM32_DMA_SPAR(chan->id)); | |
522 | u32 sm0ar = stm32_dma_read(dmadev, STM32_DMA_SM0AR(chan->id)); | |
523 | u32 sm1ar = stm32_dma_read(dmadev, STM32_DMA_SM1AR(chan->id)); | |
524 | u32 sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id)); | |
525 | ||
526 | dev_dbg(chan2dev(chan), "SCR: 0x%08x\n", scr); | |
527 | dev_dbg(chan2dev(chan), "NDTR: 0x%08x\n", ndtr); | |
528 | dev_dbg(chan2dev(chan), "SPAR: 0x%08x\n", spar); | |
529 | dev_dbg(chan2dev(chan), "SM0AR: 0x%08x\n", sm0ar); | |
530 | dev_dbg(chan2dev(chan), "SM1AR: 0x%08x\n", sm1ar); | |
531 | dev_dbg(chan2dev(chan), "SFCR: 0x%08x\n", sfcr); | |
532 | } | |
533 | ||
e57cb3b3 PYM |
534 | static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan); |
535 | ||
8d1b76f0 | 536 | static void stm32_dma_start_transfer(struct stm32_dma_chan *chan) |
d8b46839 CM |
537 | { |
538 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
539 | struct virt_dma_desc *vdesc; | |
540 | struct stm32_dma_sg_req *sg_req; | |
541 | struct stm32_dma_chan_reg *reg; | |
542 | u32 status; | |
543 | int ret; | |
544 | ||
545 | ret = stm32_dma_disable_chan(chan); | |
546 | if (ret < 0) | |
8d1b76f0 | 547 | return; |
d8b46839 CM |
548 | |
549 | if (!chan->desc) { | |
550 | vdesc = vchan_next_desc(&chan->vchan); | |
551 | if (!vdesc) | |
8d1b76f0 | 552 | return; |
d8b46839 CM |
553 | |
554 | chan->desc = to_stm32_dma_desc(vdesc); | |
555 | chan->next_sg = 0; | |
556 | } | |
557 | ||
558 | if (chan->next_sg == chan->desc->num_sgs) | |
559 | chan->next_sg = 0; | |
560 | ||
561 | sg_req = &chan->desc->sg_req[chan->next_sg]; | |
562 | reg = &sg_req->chan_reg; | |
563 | ||
564 | stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr); | |
565 | stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar); | |
566 | stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar); | |
567 | stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), reg->dma_sfcr); | |
568 | stm32_dma_write(dmadev, STM32_DMA_SM1AR(chan->id), reg->dma_sm1ar); | |
569 | stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), reg->dma_sndtr); | |
570 | ||
571 | chan->next_sg++; | |
572 | ||
573 | /* Clear interrupt status if it is there */ | |
574 | status = stm32_dma_irq_status(chan); | |
575 | if (status) | |
576 | stm32_dma_irq_clear(chan, status); | |
577 | ||
e57cb3b3 PYM |
578 | if (chan->desc->cyclic) |
579 | stm32_dma_configure_next_sg(chan); | |
580 | ||
d8b46839 CM |
581 | stm32_dma_dump_reg(chan); |
582 | ||
583 | /* Start DMA */ | |
584 | reg->dma_scr |= STM32_DMA_SCR_EN; | |
585 | stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr); | |
586 | ||
587 | chan->busy = true; | |
588 | ||
90ec93cb | 589 | dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan); |
d8b46839 CM |
590 | } |
591 | ||
592 | static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan) | |
593 | { | |
594 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
595 | struct stm32_dma_sg_req *sg_req; | |
596 | u32 dma_scr, dma_sm0ar, dma_sm1ar, id; | |
597 | ||
598 | id = chan->id; | |
599 | dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id)); | |
600 | ||
601 | if (dma_scr & STM32_DMA_SCR_DBM) { | |
602 | if (chan->next_sg == chan->desc->num_sgs) | |
603 | chan->next_sg = 0; | |
604 | ||
605 | sg_req = &chan->desc->sg_req[chan->next_sg]; | |
606 | ||
607 | if (dma_scr & STM32_DMA_SCR_CT) { | |
608 | dma_sm0ar = sg_req->chan_reg.dma_sm0ar; | |
609 | stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), dma_sm0ar); | |
610 | dev_dbg(chan2dev(chan), "CT=1 <=> SM0AR: 0x%08x\n", | |
611 | stm32_dma_read(dmadev, STM32_DMA_SM0AR(id))); | |
612 | } else { | |
613 | dma_sm1ar = sg_req->chan_reg.dma_sm1ar; | |
614 | stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), dma_sm1ar); | |
615 | dev_dbg(chan2dev(chan), "CT=0 <=> SM1AR: 0x%08x\n", | |
616 | stm32_dma_read(dmadev, STM32_DMA_SM1AR(id))); | |
617 | } | |
d8b46839 CM |
618 | } |
619 | } | |
620 | ||
621 | static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan) | |
622 | { | |
623 | if (chan->desc) { | |
624 | if (chan->desc->cyclic) { | |
625 | vchan_cyclic_callback(&chan->desc->vdesc); | |
2b12c558 | 626 | chan->next_sg++; |
d8b46839 CM |
627 | stm32_dma_configure_next_sg(chan); |
628 | } else { | |
629 | chan->busy = false; | |
630 | if (chan->next_sg == chan->desc->num_sgs) { | |
631 | list_del(&chan->desc->vdesc.node); | |
632 | vchan_cookie_complete(&chan->desc->vdesc); | |
633 | chan->desc = NULL; | |
634 | } | |
635 | stm32_dma_start_transfer(chan); | |
636 | } | |
637 | } | |
638 | } | |
639 | ||
640 | static irqreturn_t stm32_dma_chan_irq(int irq, void *devid) | |
641 | { | |
642 | struct stm32_dma_chan *chan = devid; | |
643 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
ca4c72c0 | 644 | u32 status, scr, sfcr; |
d8b46839 CM |
645 | |
646 | spin_lock(&chan->vchan.lock); | |
647 | ||
648 | status = stm32_dma_irq_status(chan); | |
649 | scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id)); | |
ca4c72c0 | 650 | sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id)); |
d8b46839 | 651 | |
c2d86b1c | 652 | if (status & STM32_DMA_TCI) { |
d8b46839 | 653 | stm32_dma_irq_clear(chan, STM32_DMA_TCI); |
c2d86b1c PYM |
654 | if (scr & STM32_DMA_SCR_TCIE) |
655 | stm32_dma_handle_chan_done(chan); | |
656 | status &= ~STM32_DMA_TCI; | |
657 | } | |
658 | if (status & STM32_DMA_HTI) { | |
659 | stm32_dma_irq_clear(chan, STM32_DMA_HTI); | |
660 | status &= ~STM32_DMA_HTI; | |
661 | } | |
662 | if (status & STM32_DMA_FEI) { | |
663 | stm32_dma_irq_clear(chan, STM32_DMA_FEI); | |
664 | status &= ~STM32_DMA_FEI; | |
ca4c72c0 PYM |
665 | if (sfcr & STM32_DMA_SFCR_FEIE) { |
666 | if (!(scr & STM32_DMA_SCR_EN)) | |
667 | dev_err(chan2dev(chan), "FIFO Error\n"); | |
668 | else | |
669 | dev_dbg(chan2dev(chan), "FIFO over/underrun\n"); | |
670 | } | |
c2d86b1c PYM |
671 | } |
672 | if (status) { | |
d8b46839 CM |
673 | stm32_dma_irq_clear(chan, status); |
674 | dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status); | |
c2d86b1c PYM |
675 | if (!(scr & STM32_DMA_SCR_EN)) |
676 | dev_err(chan2dev(chan), "chan disabled by HW\n"); | |
d8b46839 CM |
677 | } |
678 | ||
679 | spin_unlock(&chan->vchan.lock); | |
680 | ||
681 | return IRQ_HANDLED; | |
682 | } | |
683 | ||
684 | static void stm32_dma_issue_pending(struct dma_chan *c) | |
685 | { | |
686 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
687 | unsigned long flags; | |
d8b46839 CM |
688 | |
689 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
8d1b76f0 | 690 | if (vchan_issue_pending(&chan->vchan) && !chan->desc && !chan->busy) { |
90ec93cb | 691 | dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan); |
8d1b76f0 | 692 | stm32_dma_start_transfer(chan); |
e57cb3b3 | 693 | |
d8b46839 CM |
694 | } |
695 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
696 | } | |
697 | ||
698 | static int stm32_dma_set_xfer_param(struct stm32_dma_chan *chan, | |
699 | enum dma_transfer_direction direction, | |
a2b6103b PYM |
700 | enum dma_slave_buswidth *buswidth, |
701 | u32 buf_len) | |
d8b46839 CM |
702 | { |
703 | enum dma_slave_buswidth src_addr_width, dst_addr_width; | |
704 | int src_bus_width, dst_bus_width; | |
705 | int src_burst_size, dst_burst_size; | |
a2b6103b PYM |
706 | u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst; |
707 | u32 dma_scr, threshold; | |
d8b46839 CM |
708 | |
709 | src_addr_width = chan->dma_sconfig.src_addr_width; | |
710 | dst_addr_width = chan->dma_sconfig.dst_addr_width; | |
711 | src_maxburst = chan->dma_sconfig.src_maxburst; | |
712 | dst_maxburst = chan->dma_sconfig.dst_maxburst; | |
a2b6103b | 713 | threshold = chan->threshold; |
d8b46839 CM |
714 | |
715 | switch (direction) { | |
716 | case DMA_MEM_TO_DEV: | |
a2b6103b | 717 | /* Set device data size */ |
d8b46839 CM |
718 | dst_bus_width = stm32_dma_get_width(chan, dst_addr_width); |
719 | if (dst_bus_width < 0) | |
720 | return dst_bus_width; | |
721 | ||
a2b6103b PYM |
722 | /* Set device burst size */ |
723 | dst_best_burst = stm32_dma_get_best_burst(buf_len, | |
724 | dst_maxburst, | |
725 | threshold, | |
726 | dst_addr_width); | |
727 | ||
728 | dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst); | |
d8b46839 CM |
729 | if (dst_burst_size < 0) |
730 | return dst_burst_size; | |
731 | ||
a2b6103b PYM |
732 | /* Set memory data size */ |
733 | src_addr_width = stm32_dma_get_max_width(buf_len, threshold); | |
734 | chan->mem_width = src_addr_width; | |
d8b46839 CM |
735 | src_bus_width = stm32_dma_get_width(chan, src_addr_width); |
736 | if (src_bus_width < 0) | |
737 | return src_bus_width; | |
738 | ||
a2b6103b PYM |
739 | /* Set memory burst size */ |
740 | src_maxburst = STM32_DMA_MAX_BURST; | |
741 | src_best_burst = stm32_dma_get_best_burst(buf_len, | |
742 | src_maxburst, | |
743 | threshold, | |
744 | src_addr_width); | |
745 | src_burst_size = stm32_dma_get_burst(chan, src_best_burst); | |
d8b46839 CM |
746 | if (src_burst_size < 0) |
747 | return src_burst_size; | |
748 | ||
749 | dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_DEV) | | |
750 | STM32_DMA_SCR_PSIZE(dst_bus_width) | | |
751 | STM32_DMA_SCR_MSIZE(src_bus_width) | | |
752 | STM32_DMA_SCR_PBURST(dst_burst_size) | | |
753 | STM32_DMA_SCR_MBURST(src_burst_size); | |
754 | ||
a2b6103b PYM |
755 | /* Set FIFO threshold */ |
756 | chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_FTH_MASK; | |
757 | chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_FTH(threshold); | |
758 | ||
759 | /* Set peripheral address */ | |
d8b46839 CM |
760 | chan->chan_reg.dma_spar = chan->dma_sconfig.dst_addr; |
761 | *buswidth = dst_addr_width; | |
762 | break; | |
763 | ||
764 | case DMA_DEV_TO_MEM: | |
a2b6103b | 765 | /* Set device data size */ |
d8b46839 CM |
766 | src_bus_width = stm32_dma_get_width(chan, src_addr_width); |
767 | if (src_bus_width < 0) | |
768 | return src_bus_width; | |
769 | ||
a2b6103b PYM |
770 | /* Set device burst size */ |
771 | src_best_burst = stm32_dma_get_best_burst(buf_len, | |
772 | src_maxburst, | |
773 | threshold, | |
774 | src_addr_width); | |
775 | chan->mem_burst = src_best_burst; | |
776 | src_burst_size = stm32_dma_get_burst(chan, src_best_burst); | |
d8b46839 CM |
777 | if (src_burst_size < 0) |
778 | return src_burst_size; | |
779 | ||
a2b6103b PYM |
780 | /* Set memory data size */ |
781 | dst_addr_width = stm32_dma_get_max_width(buf_len, threshold); | |
782 | chan->mem_width = dst_addr_width; | |
d8b46839 CM |
783 | dst_bus_width = stm32_dma_get_width(chan, dst_addr_width); |
784 | if (dst_bus_width < 0) | |
785 | return dst_bus_width; | |
786 | ||
a2b6103b PYM |
787 | /* Set memory burst size */ |
788 | dst_maxburst = STM32_DMA_MAX_BURST; | |
789 | dst_best_burst = stm32_dma_get_best_burst(buf_len, | |
790 | dst_maxburst, | |
791 | threshold, | |
792 | dst_addr_width); | |
793 | chan->mem_burst = dst_best_burst; | |
794 | dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst); | |
d8b46839 CM |
795 | if (dst_burst_size < 0) |
796 | return dst_burst_size; | |
797 | ||
798 | dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_DEV_TO_MEM) | | |
799 | STM32_DMA_SCR_PSIZE(src_bus_width) | | |
800 | STM32_DMA_SCR_MSIZE(dst_bus_width) | | |
801 | STM32_DMA_SCR_PBURST(src_burst_size) | | |
802 | STM32_DMA_SCR_MBURST(dst_burst_size); | |
803 | ||
a2b6103b PYM |
804 | /* Set FIFO threshold */ |
805 | chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_FTH_MASK; | |
806 | chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_FTH(threshold); | |
807 | ||
808 | /* Set peripheral address */ | |
d8b46839 CM |
809 | chan->chan_reg.dma_spar = chan->dma_sconfig.src_addr; |
810 | *buswidth = chan->dma_sconfig.src_addr_width; | |
811 | break; | |
812 | ||
813 | default: | |
814 | dev_err(chan2dev(chan), "Dma direction is not supported\n"); | |
815 | return -EINVAL; | |
816 | } | |
817 | ||
a2b6103b | 818 | stm32_dma_set_fifo_config(chan, src_best_burst, dst_best_burst); |
d8b46839 | 819 | |
a2b6103b | 820 | /* Set DMA control register */ |
d8b46839 CM |
821 | chan->chan_reg.dma_scr &= ~(STM32_DMA_SCR_DIR_MASK | |
822 | STM32_DMA_SCR_PSIZE_MASK | STM32_DMA_SCR_MSIZE_MASK | | |
823 | STM32_DMA_SCR_PBURST_MASK | STM32_DMA_SCR_MBURST_MASK); | |
824 | chan->chan_reg.dma_scr |= dma_scr; | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static void stm32_dma_clear_reg(struct stm32_dma_chan_reg *regs) | |
830 | { | |
831 | memset(regs, 0, sizeof(struct stm32_dma_chan_reg)); | |
832 | } | |
833 | ||
834 | static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg( | |
835 | struct dma_chan *c, struct scatterlist *sgl, | |
836 | u32 sg_len, enum dma_transfer_direction direction, | |
837 | unsigned long flags, void *context) | |
838 | { | |
839 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
840 | struct stm32_dma_desc *desc; | |
841 | struct scatterlist *sg; | |
842 | enum dma_slave_buswidth buswidth; | |
843 | u32 nb_data_items; | |
844 | int i, ret; | |
845 | ||
846 | if (!chan->config_init) { | |
847 | dev_err(chan2dev(chan), "dma channel is not configured\n"); | |
848 | return NULL; | |
849 | } | |
850 | ||
851 | if (sg_len < 1) { | |
852 | dev_err(chan2dev(chan), "Invalid segment length %d\n", sg_len); | |
853 | return NULL; | |
854 | } | |
855 | ||
856 | desc = stm32_dma_alloc_desc(sg_len); | |
857 | if (!desc) | |
858 | return NULL; | |
859 | ||
d8b46839 CM |
860 | /* Set peripheral flow controller */ |
861 | if (chan->dma_sconfig.device_fc) | |
862 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_PFCTRL; | |
863 | else | |
864 | chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL; | |
865 | ||
866 | for_each_sg(sgl, sg, sg_len, i) { | |
a2b6103b PYM |
867 | ret = stm32_dma_set_xfer_param(chan, direction, &buswidth, |
868 | sg_dma_len(sg)); | |
869 | if (ret < 0) | |
870 | goto err; | |
871 | ||
d8b46839 CM |
872 | desc->sg_req[i].len = sg_dma_len(sg); |
873 | ||
874 | nb_data_items = desc->sg_req[i].len / buswidth; | |
80a76952 | 875 | if (nb_data_items > STM32_DMA_ALIGNED_MAX_DATA_ITEMS) { |
d8b46839 CM |
876 | dev_err(chan2dev(chan), "nb items not supported\n"); |
877 | goto err; | |
878 | } | |
879 | ||
880 | stm32_dma_clear_reg(&desc->sg_req[i].chan_reg); | |
881 | desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr; | |
882 | desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr; | |
883 | desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar; | |
884 | desc->sg_req[i].chan_reg.dma_sm0ar = sg_dma_address(sg); | |
885 | desc->sg_req[i].chan_reg.dma_sm1ar = sg_dma_address(sg); | |
886 | desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items; | |
887 | } | |
888 | ||
889 | desc->num_sgs = sg_len; | |
890 | desc->cyclic = false; | |
891 | ||
892 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
893 | ||
894 | err: | |
895 | kfree(desc); | |
896 | return NULL; | |
897 | } | |
898 | ||
899 | static struct dma_async_tx_descriptor *stm32_dma_prep_dma_cyclic( | |
900 | struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len, | |
901 | size_t period_len, enum dma_transfer_direction direction, | |
902 | unsigned long flags) | |
903 | { | |
904 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
905 | struct stm32_dma_desc *desc; | |
906 | enum dma_slave_buswidth buswidth; | |
907 | u32 num_periods, nb_data_items; | |
908 | int i, ret; | |
909 | ||
910 | if (!buf_len || !period_len) { | |
911 | dev_err(chan2dev(chan), "Invalid buffer/period len\n"); | |
912 | return NULL; | |
913 | } | |
914 | ||
915 | if (!chan->config_init) { | |
916 | dev_err(chan2dev(chan), "dma channel is not configured\n"); | |
917 | return NULL; | |
918 | } | |
919 | ||
920 | if (buf_len % period_len) { | |
921 | dev_err(chan2dev(chan), "buf_len not multiple of period_len\n"); | |
922 | return NULL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * We allow to take more number of requests till DMA is | |
927 | * not started. The driver will loop over all requests. | |
928 | * Once DMA is started then new requests can be queued only after | |
929 | * terminating the DMA. | |
930 | */ | |
931 | if (chan->busy) { | |
932 | dev_err(chan2dev(chan), "Request not allowed when dma busy\n"); | |
933 | return NULL; | |
934 | } | |
935 | ||
a2b6103b | 936 | ret = stm32_dma_set_xfer_param(chan, direction, &buswidth, period_len); |
d8b46839 CM |
937 | if (ret < 0) |
938 | return NULL; | |
939 | ||
940 | nb_data_items = period_len / buswidth; | |
80a76952 | 941 | if (nb_data_items > STM32_DMA_ALIGNED_MAX_DATA_ITEMS) { |
d8b46839 CM |
942 | dev_err(chan2dev(chan), "number of items not supported\n"); |
943 | return NULL; | |
944 | } | |
945 | ||
946 | /* Enable Circular mode or double buffer mode */ | |
947 | if (buf_len == period_len) | |
948 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_CIRC; | |
949 | else | |
950 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM; | |
951 | ||
952 | /* Clear periph ctrl if client set it */ | |
953 | chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL; | |
954 | ||
955 | num_periods = buf_len / period_len; | |
956 | ||
957 | desc = stm32_dma_alloc_desc(num_periods); | |
958 | if (!desc) | |
959 | return NULL; | |
960 | ||
961 | for (i = 0; i < num_periods; i++) { | |
962 | desc->sg_req[i].len = period_len; | |
963 | ||
964 | stm32_dma_clear_reg(&desc->sg_req[i].chan_reg); | |
965 | desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr; | |
966 | desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr; | |
967 | desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar; | |
968 | desc->sg_req[i].chan_reg.dma_sm0ar = buf_addr; | |
969 | desc->sg_req[i].chan_reg.dma_sm1ar = buf_addr; | |
970 | desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items; | |
971 | buf_addr += period_len; | |
972 | } | |
973 | ||
974 | desc->num_sgs = num_periods; | |
975 | desc->cyclic = true; | |
976 | ||
977 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
978 | } | |
979 | ||
980 | static struct dma_async_tx_descriptor *stm32_dma_prep_dma_memcpy( | |
981 | struct dma_chan *c, dma_addr_t dest, | |
982 | dma_addr_t src, size_t len, unsigned long flags) | |
983 | { | |
984 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
a2b6103b | 985 | enum dma_slave_buswidth max_width; |
d8b46839 CM |
986 | struct stm32_dma_desc *desc; |
987 | size_t xfer_count, offset; | |
a2b6103b | 988 | u32 num_sgs, best_burst, dma_burst, threshold; |
d8b46839 CM |
989 | int i; |
990 | ||
80a76952 | 991 | num_sgs = DIV_ROUND_UP(len, STM32_DMA_ALIGNED_MAX_DATA_ITEMS); |
d8b46839 CM |
992 | desc = stm32_dma_alloc_desc(num_sgs); |
993 | if (!desc) | |
994 | return NULL; | |
995 | ||
a2b6103b PYM |
996 | threshold = chan->threshold; |
997 | ||
d8b46839 CM |
998 | for (offset = 0, i = 0; offset < len; offset += xfer_count, i++) { |
999 | xfer_count = min_t(size_t, len - offset, | |
80a76952 | 1000 | STM32_DMA_ALIGNED_MAX_DATA_ITEMS); |
d8b46839 | 1001 | |
a2b6103b PYM |
1002 | /* Compute best burst size */ |
1003 | max_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1004 | best_burst = stm32_dma_get_best_burst(len, STM32_DMA_MAX_BURST, | |
1005 | threshold, max_width); | |
1006 | dma_burst = stm32_dma_get_burst(chan, best_burst); | |
d8b46839 CM |
1007 | |
1008 | stm32_dma_clear_reg(&desc->sg_req[i].chan_reg); | |
1009 | desc->sg_req[i].chan_reg.dma_scr = | |
1010 | STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_MEM) | | |
a2b6103b PYM |
1011 | STM32_DMA_SCR_PBURST(dma_burst) | |
1012 | STM32_DMA_SCR_MBURST(dma_burst) | | |
d8b46839 CM |
1013 | STM32_DMA_SCR_MINC | |
1014 | STM32_DMA_SCR_PINC | | |
1015 | STM32_DMA_SCR_TCIE | | |
1016 | STM32_DMA_SCR_TEIE; | |
a2b6103b PYM |
1017 | desc->sg_req[i].chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK; |
1018 | desc->sg_req[i].chan_reg.dma_sfcr |= | |
1019 | STM32_DMA_SFCR_FTH(threshold); | |
d8b46839 CM |
1020 | desc->sg_req[i].chan_reg.dma_spar = src + offset; |
1021 | desc->sg_req[i].chan_reg.dma_sm0ar = dest + offset; | |
1022 | desc->sg_req[i].chan_reg.dma_sndtr = xfer_count; | |
a2b6103b | 1023 | desc->sg_req[i].len = xfer_count; |
d8b46839 CM |
1024 | } |
1025 | ||
1026 | desc->num_sgs = num_sgs; | |
1027 | desc->cyclic = false; | |
1028 | ||
1029 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
1030 | } | |
1031 | ||
2b12c558 CM |
1032 | static u32 stm32_dma_get_remaining_bytes(struct stm32_dma_chan *chan) |
1033 | { | |
1034 | u32 dma_scr, width, ndtr; | |
1035 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
1036 | ||
1037 | dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id)); | |
1038 | width = STM32_DMA_SCR_PSIZE_GET(dma_scr); | |
1039 | ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id)); | |
1040 | ||
1041 | return ndtr << width; | |
1042 | } | |
1043 | ||
d8b46839 CM |
1044 | static size_t stm32_dma_desc_residue(struct stm32_dma_chan *chan, |
1045 | struct stm32_dma_desc *desc, | |
1046 | u32 next_sg) | |
1047 | { | |
a2b6103b | 1048 | u32 modulo, burst_size; |
2b12c558 | 1049 | u32 residue = 0; |
d8b46839 CM |
1050 | int i; |
1051 | ||
2b12c558 CM |
1052 | /* |
1053 | * In cyclic mode, for the last period, residue = remaining bytes from | |
1054 | * NDTR | |
1055 | */ | |
a2b6103b PYM |
1056 | if (chan->desc->cyclic && next_sg == 0) { |
1057 | residue = stm32_dma_get_remaining_bytes(chan); | |
1058 | goto end; | |
1059 | } | |
d8b46839 | 1060 | |
2b12c558 CM |
1061 | /* |
1062 | * For all other periods in cyclic mode, and in sg mode, | |
1063 | * residue = remaining bytes from NDTR + remaining periods/sg to be | |
1064 | * transferred | |
1065 | */ | |
d8b46839 CM |
1066 | for (i = next_sg; i < desc->num_sgs; i++) |
1067 | residue += desc->sg_req[i].len; | |
2b12c558 | 1068 | residue += stm32_dma_get_remaining_bytes(chan); |
d8b46839 | 1069 | |
a2b6103b PYM |
1070 | end: |
1071 | if (!chan->mem_burst) | |
1072 | return residue; | |
1073 | ||
1074 | burst_size = chan->mem_burst * chan->mem_width; | |
1075 | modulo = residue % burst_size; | |
1076 | if (modulo) | |
1077 | residue = residue - modulo + burst_size; | |
1078 | ||
d8b46839 CM |
1079 | return residue; |
1080 | } | |
1081 | ||
1082 | static enum dma_status stm32_dma_tx_status(struct dma_chan *c, | |
1083 | dma_cookie_t cookie, | |
1084 | struct dma_tx_state *state) | |
1085 | { | |
1086 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
1087 | struct virt_dma_desc *vdesc; | |
1088 | enum dma_status status; | |
1089 | unsigned long flags; | |
57b5a321 | 1090 | u32 residue = 0; |
d8b46839 CM |
1091 | |
1092 | status = dma_cookie_status(c, cookie, state); | |
249d5531 | 1093 | if (status == DMA_COMPLETE || !state) |
d8b46839 CM |
1094 | return status; |
1095 | ||
1096 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1097 | vdesc = vchan_find_desc(&chan->vchan, cookie); | |
57b5a321 | 1098 | if (chan->desc && cookie == chan->desc->vdesc.tx.cookie) |
d8b46839 CM |
1099 | residue = stm32_dma_desc_residue(chan, chan->desc, |
1100 | chan->next_sg); | |
57b5a321 | 1101 | else if (vdesc) |
d8b46839 CM |
1102 | residue = stm32_dma_desc_residue(chan, |
1103 | to_stm32_dma_desc(vdesc), 0); | |
d8b46839 CM |
1104 | dma_set_residue(state, residue); |
1105 | ||
1106 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1107 | ||
1108 | return status; | |
1109 | } | |
1110 | ||
1111 | static int stm32_dma_alloc_chan_resources(struct dma_chan *c) | |
1112 | { | |
1113 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
1114 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
1115 | int ret; | |
1116 | ||
1117 | chan->config_init = false; | |
1118 | ret = clk_prepare_enable(dmadev->clk); | |
1119 | if (ret < 0) { | |
1120 | dev_err(chan2dev(chan), "clk_prepare_enable failed: %d\n", ret); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | ret = stm32_dma_disable_chan(chan); | |
1125 | if (ret < 0) | |
1126 | clk_disable_unprepare(dmadev->clk); | |
1127 | ||
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | static void stm32_dma_free_chan_resources(struct dma_chan *c) | |
1132 | { | |
1133 | struct stm32_dma_chan *chan = to_stm32_dma_chan(c); | |
1134 | struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan); | |
1135 | unsigned long flags; | |
1136 | ||
1137 | dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id); | |
1138 | ||
1139 | if (chan->busy) { | |
1140 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1141 | stm32_dma_stop(chan); | |
1142 | chan->desc = NULL; | |
1143 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1144 | } | |
1145 | ||
1146 | clk_disable_unprepare(dmadev->clk); | |
1147 | ||
1148 | vchan_free_chan_resources(to_virt_chan(c)); | |
1149 | } | |
1150 | ||
1151 | static void stm32_dma_desc_free(struct virt_dma_desc *vdesc) | |
1152 | { | |
1153 | kfree(container_of(vdesc, struct stm32_dma_desc, vdesc)); | |
1154 | } | |
1155 | ||
e97adb49 | 1156 | static void stm32_dma_set_config(struct stm32_dma_chan *chan, |
249d5531 | 1157 | struct stm32_dma_cfg *cfg) |
d8b46839 CM |
1158 | { |
1159 | stm32_dma_clear_reg(&chan->chan_reg); | |
1160 | ||
1161 | chan->chan_reg.dma_scr = cfg->stream_config & STM32_DMA_SCR_CFG_MASK; | |
1162 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_REQ(cfg->request_line); | |
1163 | ||
1164 | /* Enable Interrupts */ | |
1165 | chan->chan_reg.dma_scr |= STM32_DMA_SCR_TEIE | STM32_DMA_SCR_TCIE; | |
1166 | ||
951f44cb | 1167 | chan->threshold = STM32_DMA_THRESHOLD_FTR_GET(cfg->features); |
d8b46839 CM |
1168 | } |
1169 | ||
1170 | static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec, | |
1171 | struct of_dma *ofdma) | |
1172 | { | |
1173 | struct stm32_dma_device *dmadev = ofdma->of_dma_data; | |
5df4eb45 | 1174 | struct device *dev = dmadev->ddev.dev; |
d8b46839 CM |
1175 | struct stm32_dma_cfg cfg; |
1176 | struct stm32_dma_chan *chan; | |
1177 | struct dma_chan *c; | |
1178 | ||
5df4eb45 CM |
1179 | if (dma_spec->args_count < 4) { |
1180 | dev_err(dev, "Bad number of cells\n"); | |
d8b46839 | 1181 | return NULL; |
5df4eb45 | 1182 | } |
d8b46839 CM |
1183 | |
1184 | cfg.channel_id = dma_spec->args[0]; | |
1185 | cfg.request_line = dma_spec->args[1]; | |
1186 | cfg.stream_config = dma_spec->args[2]; | |
951f44cb | 1187 | cfg.features = dma_spec->args[3]; |
d8b46839 | 1188 | |
249d5531 PYM |
1189 | if (cfg.channel_id >= STM32_DMA_MAX_CHANNELS || |
1190 | cfg.request_line >= STM32_DMA_MAX_REQUEST_ID) { | |
5df4eb45 | 1191 | dev_err(dev, "Bad channel and/or request id\n"); |
d8b46839 | 1192 | return NULL; |
5df4eb45 | 1193 | } |
d8b46839 | 1194 | |
d8b46839 CM |
1195 | chan = &dmadev->chan[cfg.channel_id]; |
1196 | ||
1197 | c = dma_get_slave_channel(&chan->vchan.chan); | |
5df4eb45 | 1198 | if (!c) { |
041cf7e0 | 1199 | dev_err(dev, "No more channels available\n"); |
5df4eb45 CM |
1200 | return NULL; |
1201 | } | |
1202 | ||
1203 | stm32_dma_set_config(chan, &cfg); | |
d8b46839 CM |
1204 | |
1205 | return c; | |
1206 | } | |
1207 | ||
1208 | static const struct of_device_id stm32_dma_of_match[] = { | |
1209 | { .compatible = "st,stm32-dma", }, | |
1210 | { /* sentinel */ }, | |
1211 | }; | |
1212 | MODULE_DEVICE_TABLE(of, stm32_dma_of_match); | |
1213 | ||
1214 | static int stm32_dma_probe(struct platform_device *pdev) | |
1215 | { | |
1216 | struct stm32_dma_chan *chan; | |
1217 | struct stm32_dma_device *dmadev; | |
1218 | struct dma_device *dd; | |
1219 | const struct of_device_id *match; | |
1220 | struct resource *res; | |
1221 | int i, ret; | |
1222 | ||
1223 | match = of_match_device(stm32_dma_of_match, &pdev->dev); | |
1224 | if (!match) { | |
1225 | dev_err(&pdev->dev, "Error: No device match found\n"); | |
1226 | return -ENODEV; | |
1227 | } | |
1228 | ||
1229 | dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL); | |
1230 | if (!dmadev) | |
1231 | return -ENOMEM; | |
1232 | ||
1233 | dd = &dmadev->ddev; | |
1234 | ||
1235 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1236 | dmadev->base = devm_ioremap_resource(&pdev->dev, res); | |
1237 | if (IS_ERR(dmadev->base)) | |
1238 | return PTR_ERR(dmadev->base); | |
1239 | ||
1240 | dmadev->clk = devm_clk_get(&pdev->dev, NULL); | |
1241 | if (IS_ERR(dmadev->clk)) { | |
1242 | dev_err(&pdev->dev, "Error: Missing controller clock\n"); | |
1243 | return PTR_ERR(dmadev->clk); | |
1244 | } | |
1245 | ||
1246 | dmadev->mem2mem = of_property_read_bool(pdev->dev.of_node, | |
1247 | "st,mem2mem"); | |
1248 | ||
1249 | dmadev->rst = devm_reset_control_get(&pdev->dev, NULL); | |
1250 | if (!IS_ERR(dmadev->rst)) { | |
1251 | reset_control_assert(dmadev->rst); | |
1252 | udelay(2); | |
1253 | reset_control_deassert(dmadev->rst); | |
1254 | } | |
1255 | ||
1256 | dma_cap_set(DMA_SLAVE, dd->cap_mask); | |
1257 | dma_cap_set(DMA_PRIVATE, dd->cap_mask); | |
1258 | dma_cap_set(DMA_CYCLIC, dd->cap_mask); | |
1259 | dd->device_alloc_chan_resources = stm32_dma_alloc_chan_resources; | |
1260 | dd->device_free_chan_resources = stm32_dma_free_chan_resources; | |
1261 | dd->device_tx_status = stm32_dma_tx_status; | |
1262 | dd->device_issue_pending = stm32_dma_issue_pending; | |
1263 | dd->device_prep_slave_sg = stm32_dma_prep_slave_sg; | |
1264 | dd->device_prep_dma_cyclic = stm32_dma_prep_dma_cyclic; | |
1265 | dd->device_config = stm32_dma_slave_config; | |
1266 | dd->device_terminate_all = stm32_dma_terminate_all; | |
dc808675 | 1267 | dd->device_synchronize = stm32_dma_synchronize; |
d8b46839 CM |
1268 | dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | |
1269 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | | |
1270 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); | |
1271 | dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | | |
1272 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | | |
1273 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); | |
1274 | dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
1275 | dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; | |
276b0046 | 1276 | dd->max_burst = STM32_DMA_MAX_BURST; |
d8b46839 CM |
1277 | dd->dev = &pdev->dev; |
1278 | INIT_LIST_HEAD(&dd->channels); | |
1279 | ||
1280 | if (dmadev->mem2mem) { | |
1281 | dma_cap_set(DMA_MEMCPY, dd->cap_mask); | |
1282 | dd->device_prep_dma_memcpy = stm32_dma_prep_dma_memcpy; | |
1283 | dd->directions |= BIT(DMA_MEM_TO_MEM); | |
1284 | } | |
1285 | ||
1286 | for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) { | |
1287 | chan = &dmadev->chan[i]; | |
1288 | chan->id = i; | |
1289 | chan->vchan.desc_free = stm32_dma_desc_free; | |
1290 | vchan_init(&chan->vchan, dd); | |
1291 | } | |
1292 | ||
1293 | ret = dma_async_device_register(dd); | |
1294 | if (ret) | |
1295 | return ret; | |
1296 | ||
1297 | for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) { | |
1298 | chan = &dmadev->chan[i]; | |
1299 | res = platform_get_resource(pdev, IORESOURCE_IRQ, i); | |
1300 | if (!res) { | |
1301 | ret = -EINVAL; | |
1302 | dev_err(&pdev->dev, "No irq resource for chan %d\n", i); | |
1303 | goto err_unregister; | |
1304 | } | |
1305 | chan->irq = res->start; | |
1306 | ret = devm_request_irq(&pdev->dev, chan->irq, | |
1307 | stm32_dma_chan_irq, 0, | |
1308 | dev_name(chan2dev(chan)), chan); | |
1309 | if (ret) { | |
1310 | dev_err(&pdev->dev, | |
1311 | "request_irq failed with err %d channel %d\n", | |
1312 | ret, i); | |
1313 | goto err_unregister; | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | ret = of_dma_controller_register(pdev->dev.of_node, | |
1318 | stm32_dma_of_xlate, dmadev); | |
1319 | if (ret < 0) { | |
1320 | dev_err(&pdev->dev, | |
1321 | "STM32 DMA DMA OF registration failed %d\n", ret); | |
1322 | goto err_unregister; | |
1323 | } | |
1324 | ||
1325 | platform_set_drvdata(pdev, dmadev); | |
1326 | ||
1327 | dev_info(&pdev->dev, "STM32 DMA driver registered\n"); | |
1328 | ||
1329 | return 0; | |
1330 | ||
1331 | err_unregister: | |
1332 | dma_async_device_unregister(dd); | |
1333 | ||
1334 | return ret; | |
1335 | } | |
1336 | ||
1337 | static struct platform_driver stm32_dma_driver = { | |
1338 | .driver = { | |
1339 | .name = "stm32-dma", | |
1340 | .of_match_table = stm32_dma_of_match, | |
1341 | }, | |
1342 | }; | |
1343 | ||
1344 | static int __init stm32_dma_init(void) | |
1345 | { | |
1346 | return platform_driver_probe(&stm32_dma_driver, stm32_dma_probe); | |
1347 | } | |
1348 | subsys_initcall(stm32_dma_init); |