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Commit | Line | Data |
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a580b8c5 SG |
1 | /* |
2 | * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved. | |
3 | * | |
4 | * Refer to drivers/dma/imx-sdma.c | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/semaphore.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/dma-mapping.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/dmaengine.h> | |
24 | #include <linux/delay.h> | |
90c9abc5 | 25 | #include <linux/module.h> |
f5b7efcc | 26 | #include <linux/stmp_device.h> |
90c9abc5 DA |
27 | #include <linux/of.h> |
28 | #include <linux/of_device.h> | |
d84f638b | 29 | #include <linux/of_dma.h> |
b2d63989 | 30 | #include <linux/list.h> |
a580b8c5 SG |
31 | |
32 | #include <asm/irq.h> | |
a580b8c5 | 33 | |
d2ebfb33 RKAL |
34 | #include "dmaengine.h" |
35 | ||
a580b8c5 SG |
36 | /* |
37 | * NOTE: The term "PIO" throughout the mxs-dma implementation means | |
38 | * PIO mode of mxs apbh-dma and apbx-dma. With this working mode, | |
39 | * dma can program the controller registers of peripheral devices. | |
40 | */ | |
41 | ||
8c920136 SG |
42 | #define dma_is_apbh(mxs_dma) ((mxs_dma)->type == MXS_DMA_APBH) |
43 | #define apbh_is_old(mxs_dma) ((mxs_dma)->dev_id == IMX23_DMA) | |
a580b8c5 SG |
44 | |
45 | #define HW_APBHX_CTRL0 0x000 | |
46 | #define BM_APBH_CTRL0_APB_BURST8_EN (1 << 29) | |
47 | #define BM_APBH_CTRL0_APB_BURST_EN (1 << 28) | |
a580b8c5 SG |
48 | #define BP_APBH_CTRL0_RESET_CHANNEL 16 |
49 | #define HW_APBHX_CTRL1 0x010 | |
50 | #define HW_APBHX_CTRL2 0x020 | |
51 | #define HW_APBHX_CHANNEL_CTRL 0x030 | |
52 | #define BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL 16 | |
bb11fb63 SG |
53 | /* |
54 | * The offset of NXTCMDAR register is different per both dma type and version, | |
55 | * while stride for each channel is all the same 0x70. | |
56 | */ | |
57 | #define HW_APBHX_CHn_NXTCMDAR(d, n) \ | |
58 | (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x050 : 0x110) + (n) * 0x70) | |
59 | #define HW_APBHX_CHn_SEMA(d, n) \ | |
60 | (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x080 : 0x140) + (n) * 0x70) | |
7b11304a MP |
61 | #define HW_APBHX_CHn_BAR(d, n) \ |
62 | (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x070 : 0x130) + (n) * 0x70) | |
702e94d6 | 63 | #define HW_APBX_CHn_DEBUG1(d, n) (0x150 + (n) * 0x70) |
a580b8c5 SG |
64 | |
65 | /* | |
66 | * ccw bits definitions | |
67 | * | |
68 | * COMMAND: 0..1 (2) | |
69 | * CHAIN: 2 (1) | |
70 | * IRQ: 3 (1) | |
71 | * NAND_LOCK: 4 (1) - not implemented | |
72 | * NAND_WAIT4READY: 5 (1) - not implemented | |
73 | * DEC_SEM: 6 (1) | |
74 | * WAIT4END: 7 (1) | |
75 | * HALT_ON_TERMINATE: 8 (1) | |
76 | * TERMINATE_FLUSH: 9 (1) | |
77 | * RESERVED: 10..11 (2) | |
78 | * PIO_NUM: 12..15 (4) | |
79 | */ | |
80 | #define BP_CCW_COMMAND 0 | |
81 | #define BM_CCW_COMMAND (3 << 0) | |
82 | #define CCW_CHAIN (1 << 2) | |
83 | #define CCW_IRQ (1 << 3) | |
84 | #define CCW_DEC_SEM (1 << 6) | |
85 | #define CCW_WAIT4END (1 << 7) | |
86 | #define CCW_HALT_ON_TERM (1 << 8) | |
87 | #define CCW_TERM_FLUSH (1 << 9) | |
88 | #define BP_CCW_PIO_NUM 12 | |
89 | #define BM_CCW_PIO_NUM (0xf << 12) | |
90 | ||
91 | #define BF_CCW(value, field) (((value) << BP_CCW_##field) & BM_CCW_##field) | |
92 | ||
93 | #define MXS_DMA_CMD_NO_XFER 0 | |
94 | #define MXS_DMA_CMD_WRITE 1 | |
95 | #define MXS_DMA_CMD_READ 2 | |
96 | #define MXS_DMA_CMD_DMA_SENSE 3 /* not implemented */ | |
97 | ||
98 | struct mxs_dma_ccw { | |
99 | u32 next; | |
100 | u16 bits; | |
101 | u16 xfer_bytes; | |
102 | #define MAX_XFER_BYTES 0xff00 | |
103 | u32 bufaddr; | |
104 | #define MXS_PIO_WORDS 16 | |
105 | u32 pio_words[MXS_PIO_WORDS]; | |
106 | }; | |
107 | ||
5e97fa91 MV |
108 | #define CCW_BLOCK_SIZE (4 * PAGE_SIZE) |
109 | #define NUM_CCW (int)(CCW_BLOCK_SIZE / sizeof(struct mxs_dma_ccw)) | |
a580b8c5 SG |
110 | |
111 | struct mxs_dma_chan { | |
112 | struct mxs_dma_engine *mxs_dma; | |
113 | struct dma_chan chan; | |
114 | struct dma_async_tx_descriptor desc; | |
115 | struct tasklet_struct tasklet; | |
f2ad6992 | 116 | unsigned int chan_irq; |
a580b8c5 SG |
117 | struct mxs_dma_ccw *ccw; |
118 | dma_addr_t ccw_phys; | |
6d23ea4b | 119 | int desc_count; |
a580b8c5 SG |
120 | enum dma_status status; |
121 | unsigned int flags; | |
2dcbdce3 | 122 | bool reset; |
a580b8c5 | 123 | #define MXS_DMA_SG_LOOP (1 << 0) |
2dcbdce3 | 124 | #define MXS_DMA_USE_SEMAPHORE (1 << 1) |
a580b8c5 SG |
125 | }; |
126 | ||
127 | #define MXS_DMA_CHANNELS 16 | |
128 | #define MXS_DMA_CHANNELS_MASK 0xffff | |
129 | ||
8c920136 SG |
130 | enum mxs_dma_devtype { |
131 | MXS_DMA_APBH, | |
132 | MXS_DMA_APBX, | |
133 | }; | |
134 | ||
135 | enum mxs_dma_id { | |
136 | IMX23_DMA, | |
137 | IMX28_DMA, | |
138 | }; | |
139 | ||
a580b8c5 | 140 | struct mxs_dma_engine { |
8c920136 SG |
141 | enum mxs_dma_id dev_id; |
142 | enum mxs_dma_devtype type; | |
a580b8c5 SG |
143 | void __iomem *base; |
144 | struct clk *clk; | |
145 | struct dma_device dma_device; | |
146 | struct device_dma_parameters dma_parms; | |
147 | struct mxs_dma_chan mxs_chans[MXS_DMA_CHANNELS]; | |
d84f638b SG |
148 | struct platform_device *pdev; |
149 | unsigned int nr_channels; | |
a580b8c5 SG |
150 | }; |
151 | ||
8c920136 SG |
152 | struct mxs_dma_type { |
153 | enum mxs_dma_id id; | |
154 | enum mxs_dma_devtype type; | |
155 | }; | |
156 | ||
157 | static struct mxs_dma_type mxs_dma_types[] = { | |
158 | { | |
159 | .id = IMX23_DMA, | |
160 | .type = MXS_DMA_APBH, | |
161 | }, { | |
162 | .id = IMX23_DMA, | |
163 | .type = MXS_DMA_APBX, | |
164 | }, { | |
165 | .id = IMX28_DMA, | |
166 | .type = MXS_DMA_APBH, | |
167 | }, { | |
168 | .id = IMX28_DMA, | |
169 | .type = MXS_DMA_APBX, | |
170 | } | |
171 | }; | |
172 | ||
173 | static struct platform_device_id mxs_dma_ids[] = { | |
174 | { | |
175 | .name = "imx23-dma-apbh", | |
176 | .driver_data = (kernel_ulong_t) &mxs_dma_types[0], | |
177 | }, { | |
178 | .name = "imx23-dma-apbx", | |
179 | .driver_data = (kernel_ulong_t) &mxs_dma_types[1], | |
180 | }, { | |
181 | .name = "imx28-dma-apbh", | |
182 | .driver_data = (kernel_ulong_t) &mxs_dma_types[2], | |
183 | }, { | |
184 | .name = "imx28-dma-apbx", | |
185 | .driver_data = (kernel_ulong_t) &mxs_dma_types[3], | |
186 | }, { | |
187 | /* end of list */ | |
188 | } | |
189 | }; | |
190 | ||
90c9abc5 DA |
191 | static const struct of_device_id mxs_dma_dt_ids[] = { |
192 | { .compatible = "fsl,imx23-dma-apbh", .data = &mxs_dma_ids[0], }, | |
193 | { .compatible = "fsl,imx23-dma-apbx", .data = &mxs_dma_ids[1], }, | |
194 | { .compatible = "fsl,imx28-dma-apbh", .data = &mxs_dma_ids[2], }, | |
195 | { .compatible = "fsl,imx28-dma-apbx", .data = &mxs_dma_ids[3], }, | |
196 | { /* sentinel */ } | |
197 | }; | |
198 | MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids); | |
199 | ||
8c920136 SG |
200 | static struct mxs_dma_chan *to_mxs_dma_chan(struct dma_chan *chan) |
201 | { | |
202 | return container_of(chan, struct mxs_dma_chan, chan); | |
203 | } | |
204 | ||
a580b8c5 SG |
205 | static void mxs_dma_reset_chan(struct mxs_dma_chan *mxs_chan) |
206 | { | |
207 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
208 | int chan_id = mxs_chan->chan.chan_id; | |
209 | ||
2dcbdce3 MP |
210 | /* |
211 | * mxs dma channel resets can cause a channel stall. To recover from a | |
212 | * channel stall, we have to reset the whole DMA engine. To avoid this, | |
213 | * we use cyclic DMA with semaphores, that are enhanced in | |
214 | * mxs_dma_int_handler. To reset the channel, we can simply stop writing | |
215 | * into the semaphore counter. | |
216 | */ | |
217 | if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE && | |
218 | mxs_chan->flags & MXS_DMA_SG_LOOP) { | |
219 | mxs_chan->reset = true; | |
220 | } else if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) { | |
a580b8c5 | 221 | writel(1 << (chan_id + BP_APBH_CTRL0_RESET_CHANNEL), |
f5b7efcc | 222 | mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); |
702e94d6 MP |
223 | } else { |
224 | unsigned long elapsed = 0; | |
225 | const unsigned long max_wait = 50000; /* 50ms */ | |
226 | void __iomem *reg_dbg1 = mxs_dma->base + | |
227 | HW_APBX_CHn_DEBUG1(mxs_dma, chan_id); | |
228 | ||
229 | /* | |
230 | * On i.MX28 APBX, the DMA channel can stop working if we reset | |
231 | * the channel while it is in READ_FLUSH (0x08) state. | |
232 | * We wait here until we leave the state. Then we trigger the | |
233 | * reset. Waiting a maximum of 50ms, the kernel shouldn't crash | |
234 | * because of this. | |
235 | */ | |
236 | while ((readl(reg_dbg1) & 0xf) == 0x8 && elapsed < max_wait) { | |
237 | udelay(100); | |
238 | elapsed += 100; | |
239 | } | |
240 | ||
241 | if (elapsed >= max_wait) | |
242 | dev_err(&mxs_chan->mxs_dma->pdev->dev, | |
243 | "Failed waiting for the DMA channel %d to leave state READ_FLUSH, trying to reset channel in READ_FLUSH state now\n", | |
244 | chan_id); | |
245 | ||
a580b8c5 | 246 | writel(1 << (chan_id + BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL), |
f5b7efcc | 247 | mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET); |
702e94d6 | 248 | } |
bb3660f1 MP |
249 | |
250 | mxs_chan->status = DMA_COMPLETE; | |
a580b8c5 SG |
251 | } |
252 | ||
253 | static void mxs_dma_enable_chan(struct mxs_dma_chan *mxs_chan) | |
254 | { | |
255 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
256 | int chan_id = mxs_chan->chan.chan_id; | |
257 | ||
258 | /* set cmd_addr up */ | |
259 | writel(mxs_chan->ccw_phys, | |
bb11fb63 | 260 | mxs_dma->base + HW_APBHX_CHn_NXTCMDAR(mxs_dma, chan_id)); |
a580b8c5 | 261 | |
a580b8c5 | 262 | /* write 1 to SEMA to kick off the channel */ |
2dcbdce3 MP |
263 | if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE && |
264 | mxs_chan->flags & MXS_DMA_SG_LOOP) { | |
265 | /* A cyclic DMA consists of at least 2 segments, so initialize | |
266 | * the semaphore with 2 so we have enough time to add 1 to the | |
267 | * semaphore if we need to */ | |
268 | writel(2, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id)); | |
269 | } else { | |
270 | writel(1, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id)); | |
271 | } | |
272 | mxs_chan->reset = false; | |
a580b8c5 SG |
273 | } |
274 | ||
275 | static void mxs_dma_disable_chan(struct mxs_dma_chan *mxs_chan) | |
276 | { | |
2737583e | 277 | mxs_chan->status = DMA_COMPLETE; |
a580b8c5 SG |
278 | } |
279 | ||
280 | static void mxs_dma_pause_chan(struct mxs_dma_chan *mxs_chan) | |
281 | { | |
282 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
283 | int chan_id = mxs_chan->chan.chan_id; | |
284 | ||
285 | /* freeze the channel */ | |
bb11fb63 | 286 | if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) |
a580b8c5 | 287 | writel(1 << chan_id, |
f5b7efcc | 288 | mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); |
a580b8c5 SG |
289 | else |
290 | writel(1 << chan_id, | |
f5b7efcc | 291 | mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET); |
a580b8c5 SG |
292 | |
293 | mxs_chan->status = DMA_PAUSED; | |
294 | } | |
295 | ||
296 | static void mxs_dma_resume_chan(struct mxs_dma_chan *mxs_chan) | |
297 | { | |
298 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
299 | int chan_id = mxs_chan->chan.chan_id; | |
300 | ||
301 | /* unfreeze the channel */ | |
bb11fb63 | 302 | if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) |
a580b8c5 | 303 | writel(1 << chan_id, |
f5b7efcc | 304 | mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_CLR); |
a580b8c5 SG |
305 | else |
306 | writel(1 << chan_id, | |
f5b7efcc | 307 | mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_CLR); |
a580b8c5 SG |
308 | |
309 | mxs_chan->status = DMA_IN_PROGRESS; | |
310 | } | |
311 | ||
a580b8c5 SG |
312 | static dma_cookie_t mxs_dma_tx_submit(struct dma_async_tx_descriptor *tx) |
313 | { | |
884485e1 | 314 | return dma_cookie_assign(tx); |
a580b8c5 SG |
315 | } |
316 | ||
317 | static void mxs_dma_tasklet(unsigned long data) | |
318 | { | |
319 | struct mxs_dma_chan *mxs_chan = (struct mxs_dma_chan *) data; | |
320 | ||
321 | if (mxs_chan->desc.callback) | |
322 | mxs_chan->desc.callback(mxs_chan->desc.callback_param); | |
323 | } | |
324 | ||
b2d63989 MP |
325 | static int mxs_dma_irq_to_chan(struct mxs_dma_engine *mxs_dma, int irq) |
326 | { | |
327 | int i; | |
328 | ||
329 | for (i = 0; i != mxs_dma->nr_channels; ++i) | |
330 | if (mxs_dma->mxs_chans[i].chan_irq == irq) | |
331 | return i; | |
332 | ||
333 | return -EINVAL; | |
334 | } | |
335 | ||
a580b8c5 SG |
336 | static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id) |
337 | { | |
338 | struct mxs_dma_engine *mxs_dma = dev_id; | |
b2d63989 MP |
339 | struct mxs_dma_chan *mxs_chan; |
340 | u32 completed; | |
341 | u32 err; | |
342 | int chan = mxs_dma_irq_to_chan(mxs_dma, irq); | |
343 | ||
344 | if (chan < 0) | |
345 | return IRQ_NONE; | |
a580b8c5 SG |
346 | |
347 | /* completion status */ | |
b2d63989 MP |
348 | completed = readl(mxs_dma->base + HW_APBHX_CTRL1); |
349 | completed = (completed >> chan) & 0x1; | |
350 | ||
351 | /* Clear interrupt */ | |
352 | writel((1 << chan), | |
353 | mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_CLR); | |
a580b8c5 SG |
354 | |
355 | /* error status */ | |
b2d63989 MP |
356 | err = readl(mxs_dma->base + HW_APBHX_CTRL2); |
357 | err &= (1 << (MXS_DMA_CHANNELS + chan)) | (1 << chan); | |
358 | ||
359 | /* | |
360 | * error status bit is in the upper 16 bits, error irq bit in the lower | |
361 | * 16 bits. We transform it into a simpler error code: | |
362 | * err: 0x00 = no error, 0x01 = TERMINATION, 0x02 = BUS_ERROR | |
363 | */ | |
364 | err = (err >> (MXS_DMA_CHANNELS + chan)) + (err >> chan); | |
365 | ||
366 | /* Clear error irq */ | |
367 | writel((1 << chan), | |
368 | mxs_dma->base + HW_APBHX_CTRL2 + STMP_OFFSET_REG_CLR); | |
a580b8c5 SG |
369 | |
370 | /* | |
371 | * When both completion and error of termination bits set at the | |
372 | * same time, we do not take it as an error. IOW, it only becomes | |
b2d63989 MP |
373 | * an error we need to handle here in case of either it's a bus |
374 | * error or a termination error with no completion. 0x01 is termination | |
375 | * error, so we can subtract err & completed to get the real error case. | |
a580b8c5 | 376 | */ |
b2d63989 MP |
377 | err -= err & completed; |
378 | ||
379 | mxs_chan = &mxs_dma->mxs_chans[chan]; | |
380 | ||
381 | if (err) { | |
382 | dev_dbg(mxs_dma->dma_device.dev, | |
383 | "%s: error in channel %d\n", __func__, | |
384 | chan); | |
385 | mxs_chan->status = DMA_ERROR; | |
386 | mxs_dma_reset_chan(mxs_chan); | |
bb3660f1 | 387 | } else if (mxs_chan->status != DMA_COMPLETE) { |
2dcbdce3 | 388 | if (mxs_chan->flags & MXS_DMA_SG_LOOP) { |
b2d63989 | 389 | mxs_chan->status = DMA_IN_PROGRESS; |
2dcbdce3 MP |
390 | if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE) |
391 | writel(1, mxs_dma->base + | |
392 | HW_APBHX_CHn_SEMA(mxs_dma, chan)); | |
393 | } else { | |
b2d63989 | 394 | mxs_chan->status = DMA_COMPLETE; |
2dcbdce3 | 395 | } |
a580b8c5 SG |
396 | } |
397 | ||
2dcbdce3 MP |
398 | if (mxs_chan->status == DMA_COMPLETE) { |
399 | if (mxs_chan->reset) | |
400 | return IRQ_HANDLED; | |
b2d63989 | 401 | dma_cookie_complete(&mxs_chan->desc); |
2dcbdce3 | 402 | } |
b2d63989 MP |
403 | |
404 | /* schedule tasklet on this channel */ | |
405 | tasklet_schedule(&mxs_chan->tasklet); | |
406 | ||
a580b8c5 SG |
407 | return IRQ_HANDLED; |
408 | } | |
409 | ||
410 | static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) | |
411 | { | |
412 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
a580b8c5 SG |
413 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; |
414 | int ret; | |
415 | ||
5e97fa91 MV |
416 | mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev, |
417 | CCW_BLOCK_SIZE, &mxs_chan->ccw_phys, | |
418 | GFP_KERNEL); | |
a580b8c5 SG |
419 | if (!mxs_chan->ccw) { |
420 | ret = -ENOMEM; | |
421 | goto err_alloc; | |
422 | } | |
423 | ||
5e97fa91 | 424 | memset(mxs_chan->ccw, 0, CCW_BLOCK_SIZE); |
a580b8c5 | 425 | |
95bfea16 SG |
426 | if (mxs_chan->chan_irq != NO_IRQ) { |
427 | ret = request_irq(mxs_chan->chan_irq, mxs_dma_int_handler, | |
428 | 0, "mxs-dma", mxs_dma); | |
429 | if (ret) | |
430 | goto err_irq; | |
431 | } | |
a580b8c5 | 432 | |
759a2e30 | 433 | ret = clk_prepare_enable(mxs_dma->clk); |
a580b8c5 SG |
434 | if (ret) |
435 | goto err_clk; | |
436 | ||
437 | mxs_dma_reset_chan(mxs_chan); | |
438 | ||
439 | dma_async_tx_descriptor_init(&mxs_chan->desc, chan); | |
440 | mxs_chan->desc.tx_submit = mxs_dma_tx_submit; | |
441 | ||
442 | /* the descriptor is ready */ | |
443 | async_tx_ack(&mxs_chan->desc); | |
444 | ||
445 | return 0; | |
446 | ||
447 | err_clk: | |
448 | free_irq(mxs_chan->chan_irq, mxs_dma); | |
449 | err_irq: | |
5e97fa91 | 450 | dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, |
a580b8c5 SG |
451 | mxs_chan->ccw, mxs_chan->ccw_phys); |
452 | err_alloc: | |
453 | return ret; | |
454 | } | |
455 | ||
456 | static void mxs_dma_free_chan_resources(struct dma_chan *chan) | |
457 | { | |
458 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
459 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
460 | ||
461 | mxs_dma_disable_chan(mxs_chan); | |
462 | ||
463 | free_irq(mxs_chan->chan_irq, mxs_dma); | |
464 | ||
5e97fa91 | 465 | dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, |
a580b8c5 SG |
466 | mxs_chan->ccw, mxs_chan->ccw_phys); |
467 | ||
759a2e30 | 468 | clk_disable_unprepare(mxs_dma->clk); |
a580b8c5 SG |
469 | } |
470 | ||
921de864 HS |
471 | /* |
472 | * How to use the flags for ->device_prep_slave_sg() : | |
473 | * [1] If there is only one DMA command in the DMA chain, the code should be: | |
474 | * ...... | |
475 | * ->device_prep_slave_sg(DMA_CTRL_ACK); | |
476 | * ...... | |
477 | * [2] If there are two DMA commands in the DMA chain, the code should be | |
478 | * ...... | |
479 | * ->device_prep_slave_sg(0); | |
480 | * ...... | |
481 | * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
482 | * ...... | |
483 | * [3] If there are more than two DMA commands in the DMA chain, the code | |
484 | * should be: | |
485 | * ...... | |
486 | * ->device_prep_slave_sg(0); // First | |
487 | * ...... | |
488 | * ->device_prep_slave_sg(DMA_PREP_INTERRUPT [| DMA_CTRL_ACK]); | |
489 | * ...... | |
490 | * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); // Last | |
491 | * ...... | |
492 | */ | |
a580b8c5 SG |
493 | static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg( |
494 | struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 495 | unsigned int sg_len, enum dma_transfer_direction direction, |
623ff773 | 496 | unsigned long flags, void *context) |
a580b8c5 SG |
497 | { |
498 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
499 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
500 | struct mxs_dma_ccw *ccw; | |
501 | struct scatterlist *sg; | |
f2ad6992 | 502 | u32 i, j; |
a580b8c5 | 503 | u32 *pio; |
921de864 | 504 | bool append = flags & DMA_PREP_INTERRUPT; |
6d23ea4b | 505 | int idx = append ? mxs_chan->desc_count : 0; |
a580b8c5 SG |
506 | |
507 | if (mxs_chan->status == DMA_IN_PROGRESS && !append) | |
508 | return NULL; | |
509 | ||
510 | if (sg_len + (append ? idx : 0) > NUM_CCW) { | |
511 | dev_err(mxs_dma->dma_device.dev, | |
512 | "maximum number of sg exceeded: %d > %d\n", | |
513 | sg_len, NUM_CCW); | |
514 | goto err_out; | |
515 | } | |
516 | ||
517 | mxs_chan->status = DMA_IN_PROGRESS; | |
518 | mxs_chan->flags = 0; | |
519 | ||
520 | /* | |
521 | * If the sg is prepared with append flag set, the sg | |
522 | * will be appended to the last prepared sg. | |
523 | */ | |
524 | if (append) { | |
525 | BUG_ON(idx < 1); | |
526 | ccw = &mxs_chan->ccw[idx - 1]; | |
527 | ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx; | |
528 | ccw->bits |= CCW_CHAIN; | |
529 | ccw->bits &= ~CCW_IRQ; | |
530 | ccw->bits &= ~CCW_DEC_SEM; | |
a580b8c5 SG |
531 | } else { |
532 | idx = 0; | |
533 | } | |
534 | ||
62268ce9 | 535 | if (direction == DMA_TRANS_NONE) { |
a580b8c5 SG |
536 | ccw = &mxs_chan->ccw[idx++]; |
537 | pio = (u32 *) sgl; | |
538 | ||
539 | for (j = 0; j < sg_len;) | |
540 | ccw->pio_words[j++] = *pio++; | |
541 | ||
542 | ccw->bits = 0; | |
543 | ccw->bits |= CCW_IRQ; | |
544 | ccw->bits |= CCW_DEC_SEM; | |
921de864 HS |
545 | if (flags & DMA_CTRL_ACK) |
546 | ccw->bits |= CCW_WAIT4END; | |
a580b8c5 SG |
547 | ccw->bits |= CCW_HALT_ON_TERM; |
548 | ccw->bits |= CCW_TERM_FLUSH; | |
549 | ccw->bits |= BF_CCW(sg_len, PIO_NUM); | |
550 | ccw->bits |= BF_CCW(MXS_DMA_CMD_NO_XFER, COMMAND); | |
551 | } else { | |
552 | for_each_sg(sgl, sg, sg_len, i) { | |
fdaf9c4b | 553 | if (sg_dma_len(sg) > MAX_XFER_BYTES) { |
a580b8c5 | 554 | dev_err(mxs_dma->dma_device.dev, "maximum bytes for sg entry exceeded: %d > %d\n", |
fdaf9c4b | 555 | sg_dma_len(sg), MAX_XFER_BYTES); |
a580b8c5 SG |
556 | goto err_out; |
557 | } | |
558 | ||
559 | ccw = &mxs_chan->ccw[idx++]; | |
560 | ||
561 | ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx; | |
562 | ccw->bufaddr = sg->dma_address; | |
fdaf9c4b | 563 | ccw->xfer_bytes = sg_dma_len(sg); |
a580b8c5 SG |
564 | |
565 | ccw->bits = 0; | |
566 | ccw->bits |= CCW_CHAIN; | |
567 | ccw->bits |= CCW_HALT_ON_TERM; | |
568 | ccw->bits |= CCW_TERM_FLUSH; | |
db8196df | 569 | ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ? |
a580b8c5 SG |
570 | MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ, |
571 | COMMAND); | |
572 | ||
573 | if (i + 1 == sg_len) { | |
574 | ccw->bits &= ~CCW_CHAIN; | |
575 | ccw->bits |= CCW_IRQ; | |
576 | ccw->bits |= CCW_DEC_SEM; | |
921de864 HS |
577 | if (flags & DMA_CTRL_ACK) |
578 | ccw->bits |= CCW_WAIT4END; | |
a580b8c5 SG |
579 | } |
580 | } | |
581 | } | |
6d23ea4b | 582 | mxs_chan->desc_count = idx; |
a580b8c5 SG |
583 | |
584 | return &mxs_chan->desc; | |
585 | ||
586 | err_out: | |
587 | mxs_chan->status = DMA_ERROR; | |
588 | return NULL; | |
589 | } | |
590 | ||
591 | static struct dma_async_tx_descriptor *mxs_dma_prep_dma_cyclic( | |
592 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, | |
185ecb5f | 593 | size_t period_len, enum dma_transfer_direction direction, |
ec8b5e48 | 594 | unsigned long flags, void *context) |
a580b8c5 SG |
595 | { |
596 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
597 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
f2ad6992 FE |
598 | u32 num_periods = buf_len / period_len; |
599 | u32 i = 0, buf = 0; | |
a580b8c5 SG |
600 | |
601 | if (mxs_chan->status == DMA_IN_PROGRESS) | |
602 | return NULL; | |
603 | ||
604 | mxs_chan->status = DMA_IN_PROGRESS; | |
605 | mxs_chan->flags |= MXS_DMA_SG_LOOP; | |
2dcbdce3 | 606 | mxs_chan->flags |= MXS_DMA_USE_SEMAPHORE; |
a580b8c5 SG |
607 | |
608 | if (num_periods > NUM_CCW) { | |
609 | dev_err(mxs_dma->dma_device.dev, | |
610 | "maximum number of sg exceeded: %d > %d\n", | |
611 | num_periods, NUM_CCW); | |
612 | goto err_out; | |
613 | } | |
614 | ||
615 | if (period_len > MAX_XFER_BYTES) { | |
616 | dev_err(mxs_dma->dma_device.dev, | |
617 | "maximum period size exceeded: %d > %d\n", | |
618 | period_len, MAX_XFER_BYTES); | |
619 | goto err_out; | |
620 | } | |
621 | ||
622 | while (buf < buf_len) { | |
623 | struct mxs_dma_ccw *ccw = &mxs_chan->ccw[i]; | |
624 | ||
625 | if (i + 1 == num_periods) | |
626 | ccw->next = mxs_chan->ccw_phys; | |
627 | else | |
628 | ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * (i + 1); | |
629 | ||
630 | ccw->bufaddr = dma_addr; | |
631 | ccw->xfer_bytes = period_len; | |
632 | ||
633 | ccw->bits = 0; | |
634 | ccw->bits |= CCW_CHAIN; | |
635 | ccw->bits |= CCW_IRQ; | |
636 | ccw->bits |= CCW_HALT_ON_TERM; | |
637 | ccw->bits |= CCW_TERM_FLUSH; | |
2dcbdce3 | 638 | ccw->bits |= CCW_DEC_SEM; |
db8196df | 639 | ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ? |
a580b8c5 SG |
640 | MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ, COMMAND); |
641 | ||
642 | dma_addr += period_len; | |
643 | buf += period_len; | |
644 | ||
645 | i++; | |
646 | } | |
6d23ea4b | 647 | mxs_chan->desc_count = i; |
a580b8c5 SG |
648 | |
649 | return &mxs_chan->desc; | |
650 | ||
651 | err_out: | |
652 | mxs_chan->status = DMA_ERROR; | |
653 | return NULL; | |
654 | } | |
655 | ||
656 | static int mxs_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
657 | unsigned long arg) | |
658 | { | |
659 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
660 | int ret = 0; | |
661 | ||
662 | switch (cmd) { | |
663 | case DMA_TERMINATE_ALL: | |
a62bae98 | 664 | mxs_dma_reset_chan(mxs_chan); |
7ad7a345 | 665 | mxs_dma_disable_chan(mxs_chan); |
a580b8c5 SG |
666 | break; |
667 | case DMA_PAUSE: | |
668 | mxs_dma_pause_chan(mxs_chan); | |
669 | break; | |
670 | case DMA_RESUME: | |
671 | mxs_dma_resume_chan(mxs_chan); | |
672 | break; | |
673 | default: | |
674 | ret = -ENOSYS; | |
675 | } | |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
680 | static enum dma_status mxs_dma_tx_status(struct dma_chan *chan, | |
681 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
682 | { | |
683 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
7b11304a MP |
684 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; |
685 | u32 residue = 0; | |
686 | ||
687 | if (mxs_chan->status == DMA_IN_PROGRESS && | |
688 | mxs_chan->flags & MXS_DMA_SG_LOOP) { | |
689 | struct mxs_dma_ccw *last_ccw; | |
690 | u32 bar; | |
691 | ||
692 | last_ccw = &mxs_chan->ccw[mxs_chan->desc_count - 1]; | |
693 | residue = last_ccw->xfer_bytes + last_ccw->bufaddr; | |
694 | ||
695 | bar = readl(mxs_dma->base + | |
696 | HW_APBHX_CHn_BAR(mxs_dma, chan->chan_id)); | |
697 | residue -= bar; | |
698 | } | |
a580b8c5 | 699 | |
7b11304a MP |
700 | dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, |
701 | residue); | |
a580b8c5 SG |
702 | |
703 | return mxs_chan->status; | |
704 | } | |
705 | ||
706 | static void mxs_dma_issue_pending(struct dma_chan *chan) | |
707 | { | |
d04525ed SG |
708 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); |
709 | ||
710 | mxs_dma_enable_chan(mxs_chan); | |
a580b8c5 SG |
711 | } |
712 | ||
713 | static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma) | |
714 | { | |
715 | int ret; | |
716 | ||
759a2e30 | 717 | ret = clk_prepare_enable(mxs_dma->clk); |
a580b8c5 | 718 | if (ret) |
feb397de | 719 | return ret; |
a580b8c5 | 720 | |
f5b7efcc | 721 | ret = stmp_reset_block(mxs_dma->base); |
a580b8c5 SG |
722 | if (ret) |
723 | goto err_out; | |
724 | ||
a580b8c5 | 725 | /* enable apbh burst */ |
bb11fb63 | 726 | if (dma_is_apbh(mxs_dma)) { |
a580b8c5 | 727 | writel(BM_APBH_CTRL0_APB_BURST_EN, |
f5b7efcc | 728 | mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); |
a580b8c5 | 729 | writel(BM_APBH_CTRL0_APB_BURST8_EN, |
f5b7efcc | 730 | mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); |
a580b8c5 SG |
731 | } |
732 | ||
733 | /* enable irq for all the channels */ | |
734 | writel(MXS_DMA_CHANNELS_MASK << MXS_DMA_CHANNELS, | |
f5b7efcc | 735 | mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_SET); |
a580b8c5 | 736 | |
a580b8c5 | 737 | err_out: |
57f2685c | 738 | clk_disable_unprepare(mxs_dma->clk); |
a580b8c5 SG |
739 | return ret; |
740 | } | |
741 | ||
d84f638b SG |
742 | struct mxs_dma_filter_param { |
743 | struct device_node *of_node; | |
744 | unsigned int chan_id; | |
745 | }; | |
746 | ||
747 | static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param) | |
748 | { | |
749 | struct mxs_dma_filter_param *param = fn_param; | |
750 | struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); | |
751 | struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; | |
752 | int chan_irq; | |
753 | ||
754 | if (mxs_dma->dma_device.dev->of_node != param->of_node) | |
755 | return false; | |
756 | ||
757 | if (chan->chan_id != param->chan_id) | |
758 | return false; | |
759 | ||
760 | chan_irq = platform_get_irq(mxs_dma->pdev, param->chan_id); | |
761 | if (chan_irq < 0) | |
762 | return false; | |
763 | ||
764 | mxs_chan->chan_irq = chan_irq; | |
765 | ||
766 | return true; | |
767 | } | |
768 | ||
3208b370 | 769 | static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec, |
d84f638b SG |
770 | struct of_dma *ofdma) |
771 | { | |
772 | struct mxs_dma_engine *mxs_dma = ofdma->of_dma_data; | |
773 | dma_cap_mask_t mask = mxs_dma->dma_device.cap_mask; | |
774 | struct mxs_dma_filter_param param; | |
775 | ||
776 | if (dma_spec->args_count != 1) | |
777 | return NULL; | |
778 | ||
779 | param.of_node = ofdma->of_node; | |
780 | param.chan_id = dma_spec->args[0]; | |
781 | ||
782 | if (param.chan_id >= mxs_dma->nr_channels) | |
783 | return NULL; | |
784 | ||
785 | return dma_request_channel(mask, mxs_dma_filter_fn, ¶m); | |
786 | } | |
787 | ||
a580b8c5 SG |
788 | static int __init mxs_dma_probe(struct platform_device *pdev) |
789 | { | |
d84f638b | 790 | struct device_node *np = pdev->dev.of_node; |
90c9abc5 DA |
791 | const struct platform_device_id *id_entry; |
792 | const struct of_device_id *of_id; | |
793 | const struct mxs_dma_type *dma_type; | |
a580b8c5 SG |
794 | struct mxs_dma_engine *mxs_dma; |
795 | struct resource *iores; | |
796 | int ret, i; | |
797 | ||
aaa20517 | 798 | mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL); |
a580b8c5 SG |
799 | if (!mxs_dma) |
800 | return -ENOMEM; | |
801 | ||
d84f638b SG |
802 | ret = of_property_read_u32(np, "dma-channels", &mxs_dma->nr_channels); |
803 | if (ret) { | |
804 | dev_err(&pdev->dev, "failed to read dma-channels\n"); | |
805 | return ret; | |
806 | } | |
807 | ||
90c9abc5 DA |
808 | of_id = of_match_device(mxs_dma_dt_ids, &pdev->dev); |
809 | if (of_id) | |
810 | id_entry = of_id->data; | |
811 | else | |
812 | id_entry = platform_get_device_id(pdev); | |
813 | ||
814 | dma_type = (struct mxs_dma_type *)id_entry->driver_data; | |
8c920136 | 815 | mxs_dma->type = dma_type->type; |
90c9abc5 | 816 | mxs_dma->dev_id = dma_type->id; |
a580b8c5 SG |
817 | |
818 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
aaa20517 SG |
819 | mxs_dma->base = devm_ioremap_resource(&pdev->dev, iores); |
820 | if (IS_ERR(mxs_dma->base)) | |
821 | return PTR_ERR(mxs_dma->base); | |
a580b8c5 | 822 | |
aaa20517 SG |
823 | mxs_dma->clk = devm_clk_get(&pdev->dev, NULL); |
824 | if (IS_ERR(mxs_dma->clk)) | |
825 | return PTR_ERR(mxs_dma->clk); | |
a580b8c5 SG |
826 | |
827 | dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask); | |
828 | dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask); | |
829 | ||
830 | INIT_LIST_HEAD(&mxs_dma->dma_device.channels); | |
831 | ||
832 | /* Initialize channel parameters */ | |
833 | for (i = 0; i < MXS_DMA_CHANNELS; i++) { | |
834 | struct mxs_dma_chan *mxs_chan = &mxs_dma->mxs_chans[i]; | |
835 | ||
836 | mxs_chan->mxs_dma = mxs_dma; | |
837 | mxs_chan->chan.device = &mxs_dma->dma_device; | |
8ac69546 | 838 | dma_cookie_init(&mxs_chan->chan); |
a580b8c5 SG |
839 | |
840 | tasklet_init(&mxs_chan->tasklet, mxs_dma_tasklet, | |
841 | (unsigned long) mxs_chan); | |
842 | ||
843 | ||
844 | /* Add the channel to mxs_chan list */ | |
845 | list_add_tail(&mxs_chan->chan.device_node, | |
846 | &mxs_dma->dma_device.channels); | |
847 | } | |
848 | ||
849 | ret = mxs_dma_init(mxs_dma); | |
850 | if (ret) | |
aaa20517 | 851 | return ret; |
a580b8c5 | 852 | |
d84f638b | 853 | mxs_dma->pdev = pdev; |
a580b8c5 SG |
854 | mxs_dma->dma_device.dev = &pdev->dev; |
855 | ||
856 | /* mxs_dma gets 65535 bytes maximum sg size */ | |
857 | mxs_dma->dma_device.dev->dma_parms = &mxs_dma->dma_parms; | |
858 | dma_set_max_seg_size(mxs_dma->dma_device.dev, MAX_XFER_BYTES); | |
859 | ||
860 | mxs_dma->dma_device.device_alloc_chan_resources = mxs_dma_alloc_chan_resources; | |
861 | mxs_dma->dma_device.device_free_chan_resources = mxs_dma_free_chan_resources; | |
862 | mxs_dma->dma_device.device_tx_status = mxs_dma_tx_status; | |
863 | mxs_dma->dma_device.device_prep_slave_sg = mxs_dma_prep_slave_sg; | |
864 | mxs_dma->dma_device.device_prep_dma_cyclic = mxs_dma_prep_dma_cyclic; | |
865 | mxs_dma->dma_device.device_control = mxs_dma_control; | |
866 | mxs_dma->dma_device.device_issue_pending = mxs_dma_issue_pending; | |
867 | ||
868 | ret = dma_async_device_register(&mxs_dma->dma_device); | |
869 | if (ret) { | |
870 | dev_err(mxs_dma->dma_device.dev, "unable to register\n"); | |
aaa20517 | 871 | return ret; |
a580b8c5 SG |
872 | } |
873 | ||
d84f638b SG |
874 | ret = of_dma_controller_register(np, mxs_dma_xlate, mxs_dma); |
875 | if (ret) { | |
876 | dev_err(mxs_dma->dma_device.dev, | |
877 | "failed to register controller\n"); | |
878 | dma_async_device_unregister(&mxs_dma->dma_device); | |
879 | } | |
880 | ||
a580b8c5 SG |
881 | dev_info(mxs_dma->dma_device.dev, "initialized\n"); |
882 | ||
883 | return 0; | |
a580b8c5 SG |
884 | } |
885 | ||
a580b8c5 SG |
886 | static struct platform_driver mxs_dma_driver = { |
887 | .driver = { | |
888 | .name = "mxs-dma", | |
90c9abc5 | 889 | .of_match_table = mxs_dma_dt_ids, |
a580b8c5 | 890 | }, |
8c920136 | 891 | .id_table = mxs_dma_ids, |
a580b8c5 SG |
892 | }; |
893 | ||
894 | static int __init mxs_dma_module_init(void) | |
895 | { | |
896 | return platform_driver_probe(&mxs_dma_driver, mxs_dma_probe); | |
897 | } | |
898 | subsys_initcall(mxs_dma_module_init); |