Commit | Line | Data |
---|---|---|
d8902adc NI |
1 | /* |
2 | * Renesas SuperH DMA Engine support | |
3 | * | |
4 | * base is drivers/dma/flsdma.c | |
5 | * | |
6 | * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> | |
7 | * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. | |
8 | * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. | |
9 | * | |
10 | * This is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * - DMA of SuperH does not have Hardware DMA chain mode. | |
16 | * - MAX DMA size is 16MB. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
d8902adc NI |
23 | #include <linux/interrupt.h> |
24 | #include <linux/dmaengine.h> | |
25 | #include <linux/delay.h> | |
d8902adc | 26 | #include <linux/platform_device.h> |
20f2a3b5 | 27 | #include <linux/pm_runtime.h> |
b2623a61 | 28 | #include <linux/sh_dma.h> |
03aa18f5 PM |
29 | #include <linux/notifier.h> |
30 | #include <linux/kdebug.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/rculist.h> | |
d2ebfb33 RKAL |
33 | |
34 | #include "dmaengine.h" | |
d8902adc NI |
35 | #include "shdma.h" |
36 | ||
37 | /* DMA descriptor control */ | |
3542a113 GL |
38 | enum sh_dmae_desc_status { |
39 | DESC_IDLE, | |
40 | DESC_PREPARED, | |
41 | DESC_SUBMITTED, | |
42 | DESC_COMPLETED, /* completed, have to call callback */ | |
43 | DESC_WAITING, /* callback called, waiting for ack / re-submit */ | |
44 | }; | |
d8902adc NI |
45 | |
46 | #define NR_DESCS_PER_CHANNEL 32 | |
8b1935e6 GL |
47 | /* Default MEMCPY transfer size = 2^2 = 4 bytes */ |
48 | #define LOG2_DEFAULT_XFER_SIZE 2 | |
d8902adc | 49 | |
03aa18f5 PM |
50 | /* |
51 | * Used for write-side mutual exclusion for the global device list, | |
2dc66667 | 52 | * read-side synchronization by way of RCU, and per-controller data. |
03aa18f5 PM |
53 | */ |
54 | static DEFINE_SPINLOCK(sh_dmae_lock); | |
55 | static LIST_HEAD(sh_dmae_devices); | |
56 | ||
cfefe997 | 57 | /* A bitmask with bits enough for enum sh_dmae_slave_chan_id */ |
02ca5083 | 58 | static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)]; |
cfefe997 | 59 | |
3542a113 | 60 | static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all); |
c11b46c3 GL |
61 | static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan); |
62 | ||
63 | static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data) | |
64 | { | |
65 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); | |
66 | ||
67 | __raw_writel(data, shdev->chan_reg + | |
68 | shdev->pdata->channel[sh_dc->id].chclr_offset); | |
69 | } | |
3542a113 | 70 | |
d8902adc NI |
71 | static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) |
72 | { | |
027811b9 | 73 | __raw_writel(data, sh_dc->base + reg / sizeof(u32)); |
d8902adc NI |
74 | } |
75 | ||
76 | static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) | |
77 | { | |
027811b9 GL |
78 | return __raw_readl(sh_dc->base + reg / sizeof(u32)); |
79 | } | |
80 | ||
81 | static u16 dmaor_read(struct sh_dmae_device *shdev) | |
82 | { | |
e76c3af8 KM |
83 | u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); |
84 | ||
85 | if (shdev->pdata->dmaor_is_32bit) | |
86 | return __raw_readl(addr); | |
87 | else | |
88 | return __raw_readw(addr); | |
027811b9 GL |
89 | } |
90 | ||
91 | static void dmaor_write(struct sh_dmae_device *shdev, u16 data) | |
92 | { | |
e76c3af8 KM |
93 | u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); |
94 | ||
95 | if (shdev->pdata->dmaor_is_32bit) | |
96 | __raw_writel(data, addr); | |
97 | else | |
98 | __raw_writew(data, addr); | |
d8902adc NI |
99 | } |
100 | ||
5899a723 KM |
101 | static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) |
102 | { | |
103 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); | |
104 | ||
105 | __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32)); | |
106 | } | |
107 | ||
108 | static u32 chcr_read(struct sh_dmae_chan *sh_dc) | |
109 | { | |
110 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); | |
111 | ||
112 | return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32)); | |
d8902adc NI |
113 | } |
114 | ||
d8902adc NI |
115 | /* |
116 | * Reset DMA controller | |
117 | * | |
118 | * SH7780 has two DMAOR register | |
119 | */ | |
027811b9 | 120 | static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) |
d8902adc | 121 | { |
2dc66667 GL |
122 | unsigned short dmaor; |
123 | unsigned long flags; | |
124 | ||
125 | spin_lock_irqsave(&sh_dmae_lock, flags); | |
d8902adc | 126 | |
2dc66667 | 127 | dmaor = dmaor_read(shdev); |
027811b9 | 128 | dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); |
2dc66667 GL |
129 | |
130 | spin_unlock_irqrestore(&sh_dmae_lock, flags); | |
d8902adc NI |
131 | } |
132 | ||
027811b9 | 133 | static int sh_dmae_rst(struct sh_dmae_device *shdev) |
d8902adc NI |
134 | { |
135 | unsigned short dmaor; | |
2dc66667 | 136 | unsigned long flags; |
d8902adc | 137 | |
2dc66667 | 138 | spin_lock_irqsave(&sh_dmae_lock, flags); |
d8902adc | 139 | |
2dc66667 GL |
140 | dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); |
141 | ||
c11b46c3 GL |
142 | if (shdev->pdata->chclr_present) { |
143 | int i; | |
144 | for (i = 0; i < shdev->pdata->channel_num; i++) { | |
145 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; | |
146 | if (sh_chan) | |
147 | chclr_write(sh_chan, 0); | |
148 | } | |
149 | } | |
150 | ||
2dc66667 GL |
151 | dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); |
152 | ||
153 | dmaor = dmaor_read(shdev); | |
154 | ||
155 | spin_unlock_irqrestore(&sh_dmae_lock, flags); | |
156 | ||
157 | if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { | |
158 | dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n"); | |
159 | return -EIO; | |
d8902adc | 160 | } |
c11b46c3 GL |
161 | if (shdev->pdata->dmaor_init & ~dmaor) |
162 | dev_warn(shdev->common.dev, | |
163 | "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", | |
164 | dmaor, shdev->pdata->dmaor_init); | |
d8902adc NI |
165 | return 0; |
166 | } | |
167 | ||
fc461857 | 168 | static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) |
d8902adc | 169 | { |
5899a723 | 170 | u32 chcr = chcr_read(sh_chan); |
fc461857 GL |
171 | |
172 | if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) | |
173 | return true; /* working */ | |
174 | ||
175 | return false; /* waiting */ | |
d8902adc NI |
176 | } |
177 | ||
8b1935e6 | 178 | static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) |
d8902adc | 179 | { |
c4e0dd78 | 180 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
8b1935e6 GL |
181 | struct sh_dmae_pdata *pdata = shdev->pdata; |
182 | int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | | |
183 | ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); | |
184 | ||
185 | if (cnt >= pdata->ts_shift_num) | |
186 | cnt = 0; | |
623b4ac4 | 187 | |
8b1935e6 GL |
188 | return pdata->ts_shift[cnt]; |
189 | } | |
190 | ||
191 | static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) | |
192 | { | |
c4e0dd78 | 193 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
8b1935e6 GL |
194 | struct sh_dmae_pdata *pdata = shdev->pdata; |
195 | int i; | |
196 | ||
197 | for (i = 0; i < pdata->ts_shift_num; i++) | |
198 | if (pdata->ts_shift[i] == l2size) | |
199 | break; | |
200 | ||
201 | if (i == pdata->ts_shift_num) | |
202 | i = 0; | |
203 | ||
204 | return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | | |
205 | ((i << pdata->ts_high_shift) & pdata->ts_high_mask); | |
d8902adc NI |
206 | } |
207 | ||
3542a113 | 208 | static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) |
d8902adc | 209 | { |
3542a113 GL |
210 | sh_dmae_writel(sh_chan, hw->sar, SAR); |
211 | sh_dmae_writel(sh_chan, hw->dar, DAR); | |
cfefe997 | 212 | sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); |
d8902adc NI |
213 | } |
214 | ||
215 | static void dmae_start(struct sh_dmae_chan *sh_chan) | |
216 | { | |
67c6269e | 217 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
5899a723 | 218 | u32 chcr = chcr_read(sh_chan); |
d8902adc | 219 | |
260bf2c5 KM |
220 | if (shdev->pdata->needs_tend_set) |
221 | sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); | |
222 | ||
67c6269e | 223 | chcr |= CHCR_DE | shdev->chcr_ie_bit; |
5899a723 | 224 | chcr_write(sh_chan, chcr & ~CHCR_TE); |
d8902adc NI |
225 | } |
226 | ||
227 | static void dmae_halt(struct sh_dmae_chan *sh_chan) | |
228 | { | |
67c6269e | 229 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
5899a723 | 230 | u32 chcr = chcr_read(sh_chan); |
d8902adc | 231 | |
67c6269e | 232 | chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); |
5899a723 | 233 | chcr_write(sh_chan, chcr); |
d8902adc NI |
234 | } |
235 | ||
cfefe997 GL |
236 | static void dmae_init(struct sh_dmae_chan *sh_chan) |
237 | { | |
8b1935e6 GL |
238 | /* |
239 | * Default configuration for dual address memory-memory transfer. | |
240 | * 0x400 represents auto-request. | |
241 | */ | |
242 | u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, | |
243 | LOG2_DEFAULT_XFER_SIZE); | |
244 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); | |
5899a723 | 245 | chcr_write(sh_chan, chcr); |
cfefe997 GL |
246 | } |
247 | ||
d8902adc NI |
248 | static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) |
249 | { | |
2dc66667 | 250 | /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ |
fc461857 GL |
251 | if (dmae_is_busy(sh_chan)) |
252 | return -EBUSY; | |
d8902adc | 253 | |
8b1935e6 | 254 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); |
5899a723 | 255 | chcr_write(sh_chan, val); |
cfefe997 | 256 | |
d8902adc NI |
257 | return 0; |
258 | } | |
259 | ||
d8902adc NI |
260 | static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) |
261 | { | |
c4e0dd78 | 262 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
027811b9 | 263 | struct sh_dmae_pdata *pdata = shdev->pdata; |
5bac942d | 264 | const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id]; |
26fc02ab | 265 | u16 __iomem *addr = shdev->dmars; |
090b9180 | 266 | unsigned int shift = chan_pdata->dmars_bit; |
fc461857 GL |
267 | |
268 | if (dmae_is_busy(sh_chan)) | |
269 | return -EBUSY; | |
d8902adc | 270 | |
260bf2c5 KM |
271 | if (pdata->no_dmars) |
272 | return 0; | |
273 | ||
26fc02ab MD |
274 | /* in the case of a missing DMARS resource use first memory window */ |
275 | if (!addr) | |
276 | addr = (u16 __iomem *)shdev->chan_reg; | |
277 | addr += chan_pdata->dmars / sizeof(u16); | |
278 | ||
027811b9 GL |
279 | __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), |
280 | addr); | |
d8902adc NI |
281 | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx) | |
286 | { | |
3542a113 | 287 | struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c; |
d8902adc | 288 | struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan); |
7a1cd9ad | 289 | struct sh_dmae_slave *param = tx->chan->private; |
3542a113 | 290 | dma_async_tx_callback callback = tx->callback; |
d8902adc | 291 | dma_cookie_t cookie; |
7a1cd9ad | 292 | bool power_up; |
d8902adc | 293 | |
7a1cd9ad GL |
294 | spin_lock_irq(&sh_chan->desc_lock); |
295 | ||
296 | if (list_empty(&sh_chan->ld_queue)) | |
297 | power_up = true; | |
298 | else | |
299 | power_up = false; | |
d8902adc | 300 | |
884485e1 | 301 | cookie = dma_cookie_assign(tx); |
3542a113 GL |
302 | |
303 | /* Mark all chunks of this descriptor as submitted, move to the queue */ | |
304 | list_for_each_entry_safe(chunk, c, desc->node.prev, node) { | |
305 | /* | |
306 | * All chunks are on the global ld_free, so, we have to find | |
307 | * the end of the chain ourselves | |
308 | */ | |
309 | if (chunk != desc && (chunk->mark == DESC_IDLE || | |
310 | chunk->async_tx.cookie > 0 || | |
311 | chunk->async_tx.cookie == -EBUSY || | |
312 | &chunk->node == &sh_chan->ld_free)) | |
313 | break; | |
314 | chunk->mark = DESC_SUBMITTED; | |
315 | /* Callback goes to the last chunk */ | |
316 | chunk->async_tx.callback = NULL; | |
317 | chunk->cookie = cookie; | |
318 | list_move_tail(&chunk->node, &sh_chan->ld_queue); | |
319 | last = chunk; | |
320 | } | |
d8902adc | 321 | |
3542a113 GL |
322 | last->async_tx.callback = callback; |
323 | last->async_tx.callback_param = tx->callback_param; | |
324 | ||
325 | dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n", | |
326 | tx->cookie, &last->async_tx, sh_chan->id, | |
327 | desc->hw.sar, desc->hw.tcr, desc->hw.dar); | |
d8902adc | 328 | |
7a1cd9ad GL |
329 | if (power_up) { |
330 | sh_chan->pm_state = DMAE_PM_BUSY; | |
331 | ||
332 | pm_runtime_get(sh_chan->dev); | |
333 | ||
334 | spin_unlock_irq(&sh_chan->desc_lock); | |
335 | ||
336 | pm_runtime_barrier(sh_chan->dev); | |
337 | ||
338 | spin_lock_irq(&sh_chan->desc_lock); | |
339 | ||
340 | /* Have we been reset, while waiting? */ | |
341 | if (sh_chan->pm_state != DMAE_PM_ESTABLISHED) { | |
342 | dev_dbg(sh_chan->dev, "Bring up channel %d\n", | |
343 | sh_chan->id); | |
344 | if (param) { | |
345 | const struct sh_dmae_slave_config *cfg = | |
346 | param->config; | |
347 | ||
348 | dmae_set_dmars(sh_chan, cfg->mid_rid); | |
349 | dmae_set_chcr(sh_chan, cfg->chcr); | |
350 | } else { | |
351 | dmae_init(sh_chan); | |
352 | } | |
353 | ||
354 | if (sh_chan->pm_state == DMAE_PM_PENDING) | |
355 | sh_chan_xfer_ld_queue(sh_chan); | |
356 | sh_chan->pm_state = DMAE_PM_ESTABLISHED; | |
357 | } | |
c11b46c3 GL |
358 | } else { |
359 | sh_chan->pm_state = DMAE_PM_PENDING; | |
7a1cd9ad GL |
360 | } |
361 | ||
362 | spin_unlock_irq(&sh_chan->desc_lock); | |
d8902adc NI |
363 | |
364 | return cookie; | |
365 | } | |
366 | ||
3542a113 | 367 | /* Called with desc_lock held */ |
d8902adc NI |
368 | static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan) |
369 | { | |
3542a113 | 370 | struct sh_desc *desc; |
d8902adc | 371 | |
3542a113 GL |
372 | list_for_each_entry(desc, &sh_chan->ld_free, node) |
373 | if (desc->mark != DESC_PREPARED) { | |
374 | BUG_ON(desc->mark != DESC_IDLE); | |
d8902adc | 375 | list_del(&desc->node); |
3542a113 | 376 | return desc; |
d8902adc | 377 | } |
d8902adc | 378 | |
3542a113 | 379 | return NULL; |
d8902adc NI |
380 | } |
381 | ||
5bac942d | 382 | static const struct sh_dmae_slave_config *sh_dmae_find_slave( |
4bab9d42 | 383 | struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param) |
cfefe997 | 384 | { |
c4e0dd78 | 385 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
027811b9 | 386 | struct sh_dmae_pdata *pdata = shdev->pdata; |
cfefe997 GL |
387 | int i; |
388 | ||
02ca5083 | 389 | if (param->slave_id >= SH_DMA_SLAVE_NUMBER) |
cfefe997 GL |
390 | return NULL; |
391 | ||
027811b9 | 392 | for (i = 0; i < pdata->slave_num; i++) |
4bab9d42 | 393 | if (pdata->slave[i].slave_id == param->slave_id) |
027811b9 | 394 | return pdata->slave + i; |
cfefe997 GL |
395 | |
396 | return NULL; | |
397 | } | |
398 | ||
d8902adc NI |
399 | static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) |
400 | { | |
401 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); | |
402 | struct sh_desc *desc; | |
cfefe997 | 403 | struct sh_dmae_slave *param = chan->private; |
83515bc7 | 404 | int ret; |
cfefe997 GL |
405 | |
406 | /* | |
407 | * This relies on the guarantee from dmaengine that alloc_chan_resources | |
408 | * never runs concurrently with itself or free_chan_resources. | |
409 | */ | |
410 | if (param) { | |
5bac942d | 411 | const struct sh_dmae_slave_config *cfg; |
cfefe997 | 412 | |
4bab9d42 | 413 | cfg = sh_dmae_find_slave(sh_chan, param); |
83515bc7 GL |
414 | if (!cfg) { |
415 | ret = -EINVAL; | |
416 | goto efindslave; | |
417 | } | |
cfefe997 | 418 | |
83515bc7 GL |
419 | if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) { |
420 | ret = -EBUSY; | |
421 | goto etestused; | |
422 | } | |
cfefe997 GL |
423 | |
424 | param->config = cfg; | |
cfefe997 | 425 | } |
d8902adc | 426 | |
d8902adc | 427 | while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) { |
d8902adc | 428 | desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL); |
b4dae6e1 | 429 | if (!desc) |
d8902adc | 430 | break; |
d8902adc NI |
431 | dma_async_tx_descriptor_init(&desc->async_tx, |
432 | &sh_chan->common); | |
433 | desc->async_tx.tx_submit = sh_dmae_tx_submit; | |
3542a113 | 434 | desc->mark = DESC_IDLE; |
d8902adc | 435 | |
3542a113 | 436 | list_add(&desc->node, &sh_chan->ld_free); |
d8902adc NI |
437 | sh_chan->descs_allocated++; |
438 | } | |
d8902adc | 439 | |
83515bc7 GL |
440 | if (!sh_chan->descs_allocated) { |
441 | ret = -ENOMEM; | |
442 | goto edescalloc; | |
443 | } | |
20f2a3b5 | 444 | |
d8902adc | 445 | return sh_chan->descs_allocated; |
83515bc7 GL |
446 | |
447 | edescalloc: | |
448 | if (param) | |
449 | clear_bit(param->slave_id, sh_dmae_slave_used); | |
450 | etestused: | |
451 | efindslave: | |
b4dae6e1 | 452 | chan->private = NULL; |
83515bc7 | 453 | return ret; |
d8902adc NI |
454 | } |
455 | ||
456 | /* | |
457 | * sh_dma_free_chan_resources - Free all resources of the channel. | |
458 | */ | |
459 | static void sh_dmae_free_chan_resources(struct dma_chan *chan) | |
460 | { | |
461 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); | |
462 | struct sh_desc *desc, *_desc; | |
463 | LIST_HEAD(list); | |
464 | ||
2dc66667 GL |
465 | /* Protect against ISR */ |
466 | spin_lock_irq(&sh_chan->desc_lock); | |
cfefe997 | 467 | dmae_halt(sh_chan); |
2dc66667 GL |
468 | spin_unlock_irq(&sh_chan->desc_lock); |
469 | ||
470 | /* Now no new interrupts will occur */ | |
cfefe997 | 471 | |
3542a113 GL |
472 | /* Prepared and not submitted descriptors can still be on the queue */ |
473 | if (!list_empty(&sh_chan->ld_queue)) | |
474 | sh_dmae_chan_ld_cleanup(sh_chan, true); | |
475 | ||
cfefe997 GL |
476 | if (chan->private) { |
477 | /* The caller is holding dma_list_mutex */ | |
478 | struct sh_dmae_slave *param = chan->private; | |
479 | clear_bit(param->slave_id, sh_dmae_slave_used); | |
2dc66667 | 480 | chan->private = NULL; |
cfefe997 GL |
481 | } |
482 | ||
b4dae6e1 | 483 | spin_lock_irq(&sh_chan->desc_lock); |
d8902adc NI |
484 | |
485 | list_splice_init(&sh_chan->ld_free, &list); | |
486 | sh_chan->descs_allocated = 0; | |
487 | ||
b4dae6e1 | 488 | spin_unlock_irq(&sh_chan->desc_lock); |
d8902adc NI |
489 | |
490 | list_for_each_entry_safe(desc, _desc, &list, node) | |
491 | kfree(desc); | |
492 | } | |
493 | ||
cfefe997 | 494 | /** |
fc461857 GL |
495 | * sh_dmae_add_desc - get, set up and return one transfer descriptor |
496 | * @sh_chan: DMA channel | |
497 | * @flags: DMA transfer flags | |
498 | * @dest: destination DMA address, incremented when direction equals | |
db8196df | 499 | * DMA_DEV_TO_MEM |
fc461857 | 500 | * @src: source DMA address, incremented when direction equals |
db8196df | 501 | * DMA_MEM_TO_DEV |
fc461857 GL |
502 | * @len: DMA transfer length |
503 | * @first: if NULL, set to the current descriptor and cookie set to -EBUSY | |
504 | * @direction: needed for slave DMA to decide which address to keep constant, | |
db8196df | 505 | * equals DMA_MEM_TO_MEM for MEMCPY |
fc461857 GL |
506 | * Returns 0 or an error |
507 | * Locks: called with desc_lock held | |
508 | */ | |
509 | static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan, | |
510 | unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len, | |
db8196df | 511 | struct sh_desc **first, enum dma_transfer_direction direction) |
d8902adc | 512 | { |
fc461857 | 513 | struct sh_desc *new; |
d8902adc NI |
514 | size_t copy_size; |
515 | ||
fc461857 | 516 | if (!*len) |
d8902adc NI |
517 | return NULL; |
518 | ||
fc461857 GL |
519 | /* Allocate the link descriptor from the free list */ |
520 | new = sh_dmae_get_desc(sh_chan); | |
521 | if (!new) { | |
522 | dev_err(sh_chan->dev, "No free link descriptor available\n"); | |
d8902adc | 523 | return NULL; |
fc461857 | 524 | } |
d8902adc | 525 | |
fc461857 GL |
526 | copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1); |
527 | ||
528 | new->hw.sar = *src; | |
529 | new->hw.dar = *dest; | |
530 | new->hw.tcr = copy_size; | |
531 | ||
532 | if (!*first) { | |
533 | /* First desc */ | |
534 | new->async_tx.cookie = -EBUSY; | |
535 | *first = new; | |
536 | } else { | |
537 | /* Other desc - invisible to the user */ | |
538 | new->async_tx.cookie = -EINVAL; | |
539 | } | |
540 | ||
cfefe997 GL |
541 | dev_dbg(sh_chan->dev, |
542 | "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n", | |
fc461857 | 543 | copy_size, *len, *src, *dest, &new->async_tx, |
cfefe997 | 544 | new->async_tx.cookie, sh_chan->xmit_shift); |
fc461857 GL |
545 | |
546 | new->mark = DESC_PREPARED; | |
547 | new->async_tx.flags = flags; | |
cfefe997 | 548 | new->direction = direction; |
fc461857 GL |
549 | |
550 | *len -= copy_size; | |
db8196df | 551 | if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV) |
fc461857 | 552 | *src += copy_size; |
db8196df | 553 | if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM) |
fc461857 GL |
554 | *dest += copy_size; |
555 | ||
556 | return new; | |
557 | } | |
558 | ||
559 | /* | |
560 | * sh_dmae_prep_sg - prepare transfer descriptors from an SG list | |
561 | * | |
562 | * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also | |
563 | * converted to scatter-gather to guarantee consistent locking and a correct | |
564 | * list manipulation. For slave DMA direction carries the usual meaning, and, | |
565 | * logically, the SG list is RAM and the addr variable contains slave address, | |
db8196df | 566 | * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM |
fc461857 GL |
567 | * and the SG list contains only one element and points at the source buffer. |
568 | */ | |
569 | static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan, | |
570 | struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, | |
db8196df | 571 | enum dma_transfer_direction direction, unsigned long flags) |
fc461857 GL |
572 | { |
573 | struct scatterlist *sg; | |
574 | struct sh_desc *first = NULL, *new = NULL /* compiler... */; | |
575 | LIST_HEAD(tx_list); | |
576 | int chunks = 0; | |
b4dae6e1 | 577 | unsigned long irq_flags; |
fc461857 GL |
578 | int i; |
579 | ||
580 | if (!sg_len) | |
581 | return NULL; | |
582 | ||
583 | for_each_sg(sgl, sg, sg_len, i) | |
584 | chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) / | |
585 | (SH_DMA_TCR_MAX + 1); | |
d8902adc | 586 | |
3542a113 | 587 | /* Have to lock the whole loop to protect against concurrent release */ |
b4dae6e1 | 588 | spin_lock_irqsave(&sh_chan->desc_lock, irq_flags); |
3542a113 GL |
589 | |
590 | /* | |
591 | * Chaining: | |
592 | * first descriptor is what user is dealing with in all API calls, its | |
593 | * cookie is at first set to -EBUSY, at tx-submit to a positive | |
594 | * number | |
595 | * if more than one chunk is needed further chunks have cookie = -EINVAL | |
596 | * the last chunk, if not equal to the first, has cookie = -ENOSPC | |
597 | * all chunks are linked onto the tx_list head with their .node heads | |
598 | * only during this function, then they are immediately spliced | |
599 | * back onto the free list in form of a chain | |
600 | */ | |
fc461857 GL |
601 | for_each_sg(sgl, sg, sg_len, i) { |
602 | dma_addr_t sg_addr = sg_dma_address(sg); | |
603 | size_t len = sg_dma_len(sg); | |
604 | ||
605 | if (!len) | |
606 | goto err_get_desc; | |
607 | ||
608 | do { | |
609 | dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n", | |
610 | i, sg, len, (unsigned long long)sg_addr); | |
611 | ||
db8196df | 612 | if (direction == DMA_DEV_TO_MEM) |
fc461857 GL |
613 | new = sh_dmae_add_desc(sh_chan, flags, |
614 | &sg_addr, addr, &len, &first, | |
615 | direction); | |
616 | else | |
617 | new = sh_dmae_add_desc(sh_chan, flags, | |
618 | addr, &sg_addr, &len, &first, | |
619 | direction); | |
620 | if (!new) | |
621 | goto err_get_desc; | |
622 | ||
623 | new->chunks = chunks--; | |
624 | list_add_tail(&new->node, &tx_list); | |
625 | } while (len); | |
626 | } | |
d8902adc | 627 | |
3542a113 GL |
628 | if (new != first) |
629 | new->async_tx.cookie = -ENOSPC; | |
d8902adc | 630 | |
3542a113 GL |
631 | /* Put them back on the free list, so, they don't get lost */ |
632 | list_splice_tail(&tx_list, &sh_chan->ld_free); | |
d8902adc | 633 | |
b4dae6e1 | 634 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
d8902adc | 635 | |
3542a113 | 636 | return &first->async_tx; |
fc461857 GL |
637 | |
638 | err_get_desc: | |
639 | list_for_each_entry(new, &tx_list, node) | |
640 | new->mark = DESC_IDLE; | |
641 | list_splice(&tx_list, &sh_chan->ld_free); | |
642 | ||
b4dae6e1 | 643 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
fc461857 GL |
644 | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy( | |
649 | struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, | |
650 | size_t len, unsigned long flags) | |
651 | { | |
652 | struct sh_dmae_chan *sh_chan; | |
653 | struct scatterlist sg; | |
654 | ||
655 | if (!chan || !len) | |
656 | return NULL; | |
657 | ||
658 | sh_chan = to_sh_chan(chan); | |
659 | ||
660 | sg_init_table(&sg, 1); | |
661 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len, | |
662 | offset_in_page(dma_src)); | |
663 | sg_dma_address(&sg) = dma_src; | |
664 | sg_dma_len(&sg) = len; | |
665 | ||
db8196df | 666 | return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, |
fc461857 | 667 | flags); |
d8902adc NI |
668 | } |
669 | ||
cfefe997 GL |
670 | static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg( |
671 | struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, | |
db8196df | 672 | enum dma_transfer_direction direction, unsigned long flags) |
cfefe997 GL |
673 | { |
674 | struct sh_dmae_slave *param; | |
675 | struct sh_dmae_chan *sh_chan; | |
5bac942d | 676 | dma_addr_t slave_addr; |
cfefe997 GL |
677 | |
678 | if (!chan) | |
679 | return NULL; | |
680 | ||
681 | sh_chan = to_sh_chan(chan); | |
682 | param = chan->private; | |
683 | ||
684 | /* Someone calling slave DMA on a public channel? */ | |
685 | if (!param || !sg_len) { | |
686 | dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n", | |
687 | __func__, param, sg_len, param ? param->slave_id : -1); | |
688 | return NULL; | |
689 | } | |
690 | ||
9f9ff20d DC |
691 | slave_addr = param->config->addr; |
692 | ||
cfefe997 GL |
693 | /* |
694 | * if (param != NULL), this is a successfully requested slave channel, | |
695 | * therefore param->config != NULL too. | |
696 | */ | |
5bac942d | 697 | return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr, |
cfefe997 GL |
698 | direction, flags); |
699 | } | |
700 | ||
05827630 LW |
701 | static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
702 | unsigned long arg) | |
cfefe997 GL |
703 | { |
704 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); | |
b4dae6e1 | 705 | unsigned long flags; |
cfefe997 | 706 | |
c3635c78 LW |
707 | /* Only supports DMA_TERMINATE_ALL */ |
708 | if (cmd != DMA_TERMINATE_ALL) | |
709 | return -ENXIO; | |
710 | ||
cfefe997 | 711 | if (!chan) |
c3635c78 | 712 | return -EINVAL; |
cfefe997 | 713 | |
b4dae6e1 | 714 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
c014906a GL |
715 | dmae_halt(sh_chan); |
716 | ||
c014906a GL |
717 | if (!list_empty(&sh_chan->ld_queue)) { |
718 | /* Record partial transfer */ | |
719 | struct sh_desc *desc = list_entry(sh_chan->ld_queue.next, | |
720 | struct sh_desc, node); | |
721 | desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << | |
722 | sh_chan->xmit_shift; | |
c014906a | 723 | } |
b4dae6e1 | 724 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
c014906a | 725 | |
cfefe997 | 726 | sh_dmae_chan_ld_cleanup(sh_chan, true); |
c3635c78 LW |
727 | |
728 | return 0; | |
cfefe997 GL |
729 | } |
730 | ||
3542a113 | 731 | static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all) |
d8902adc NI |
732 | { |
733 | struct sh_desc *desc, *_desc; | |
3542a113 GL |
734 | /* Is the "exposed" head of a chain acked? */ |
735 | bool head_acked = false; | |
736 | dma_cookie_t cookie = 0; | |
737 | dma_async_tx_callback callback = NULL; | |
738 | void *param = NULL; | |
b4dae6e1 | 739 | unsigned long flags; |
d8902adc | 740 | |
b4dae6e1 | 741 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
d8902adc | 742 | list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) { |
3542a113 GL |
743 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
744 | ||
745 | BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie); | |
746 | BUG_ON(desc->mark != DESC_SUBMITTED && | |
747 | desc->mark != DESC_COMPLETED && | |
748 | desc->mark != DESC_WAITING); | |
749 | ||
750 | /* | |
751 | * queue is ordered, and we use this loop to (1) clean up all | |
752 | * completed descriptors, and to (2) update descriptor flags of | |
753 | * any chunks in a (partially) completed chain | |
754 | */ | |
755 | if (!all && desc->mark == DESC_SUBMITTED && | |
756 | desc->cookie != cookie) | |
d8902adc NI |
757 | break; |
758 | ||
3542a113 GL |
759 | if (tx->cookie > 0) |
760 | cookie = tx->cookie; | |
d8902adc | 761 | |
3542a113 | 762 | if (desc->mark == DESC_COMPLETED && desc->chunks == 1) { |
4d4e58de | 763 | if (sh_chan->common.completed_cookie != desc->cookie - 1) |
cfefe997 GL |
764 | dev_dbg(sh_chan->dev, |
765 | "Completing cookie %d, expected %d\n", | |
766 | desc->cookie, | |
4d4e58de RKAL |
767 | sh_chan->common.completed_cookie + 1); |
768 | sh_chan->common.completed_cookie = desc->cookie; | |
3542a113 | 769 | } |
d8902adc | 770 | |
3542a113 GL |
771 | /* Call callback on the last chunk */ |
772 | if (desc->mark == DESC_COMPLETED && tx->callback) { | |
773 | desc->mark = DESC_WAITING; | |
774 | callback = tx->callback; | |
775 | param = tx->callback_param; | |
776 | dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n", | |
777 | tx->cookie, tx, sh_chan->id); | |
778 | BUG_ON(desc->chunks != 1); | |
779 | break; | |
780 | } | |
d8902adc | 781 | |
3542a113 GL |
782 | if (tx->cookie > 0 || tx->cookie == -EBUSY) { |
783 | if (desc->mark == DESC_COMPLETED) { | |
784 | BUG_ON(tx->cookie < 0); | |
785 | desc->mark = DESC_WAITING; | |
786 | } | |
787 | head_acked = async_tx_test_ack(tx); | |
788 | } else { | |
789 | switch (desc->mark) { | |
790 | case DESC_COMPLETED: | |
791 | desc->mark = DESC_WAITING; | |
792 | /* Fall through */ | |
793 | case DESC_WAITING: | |
794 | if (head_acked) | |
795 | async_tx_ack(&desc->async_tx); | |
796 | } | |
797 | } | |
798 | ||
799 | dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n", | |
800 | tx, tx->cookie); | |
801 | ||
802 | if (((desc->mark == DESC_COMPLETED || | |
803 | desc->mark == DESC_WAITING) && | |
804 | async_tx_test_ack(&desc->async_tx)) || all) { | |
805 | /* Remove from ld_queue list */ | |
806 | desc->mark = DESC_IDLE; | |
7a1cd9ad | 807 | |
3542a113 | 808 | list_move(&desc->node, &sh_chan->ld_free); |
7a1cd9ad GL |
809 | |
810 | if (list_empty(&sh_chan->ld_queue)) { | |
811 | dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id); | |
812 | pm_runtime_put(sh_chan->dev); | |
813 | } | |
d8902adc NI |
814 | } |
815 | } | |
2dc66667 GL |
816 | |
817 | if (all && !callback) | |
818 | /* | |
819 | * Terminating and the loop completed normally: forgive | |
820 | * uncompleted cookies | |
821 | */ | |
4d4e58de | 822 | sh_chan->common.completed_cookie = sh_chan->common.cookie; |
2dc66667 | 823 | |
b4dae6e1 | 824 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
3542a113 GL |
825 | |
826 | if (callback) | |
827 | callback(param); | |
828 | ||
829 | return callback; | |
830 | } | |
831 | ||
832 | /* | |
833 | * sh_chan_ld_cleanup - Clean up link descriptors | |
834 | * | |
835 | * This function cleans up the ld_queue of DMA channel. | |
836 | */ | |
837 | static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all) | |
838 | { | |
839 | while (__ld_cleanup(sh_chan, all)) | |
840 | ; | |
d8902adc NI |
841 | } |
842 | ||
7a1cd9ad | 843 | /* Called under spin_lock_irq(&sh_chan->desc_lock) */ |
d8902adc NI |
844 | static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) |
845 | { | |
47a4dc26 | 846 | struct sh_desc *desc; |
d8902adc NI |
847 | |
848 | /* DMA work check */ | |
7a1cd9ad | 849 | if (dmae_is_busy(sh_chan)) |
b4dae6e1 | 850 | return; |
d8902adc | 851 | |
5a3a7658 | 852 | /* Find the first not transferred descriptor */ |
47a4dc26 GL |
853 | list_for_each_entry(desc, &sh_chan->ld_queue, node) |
854 | if (desc->mark == DESC_SUBMITTED) { | |
c014906a GL |
855 | dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n", |
856 | desc->async_tx.cookie, sh_chan->id, | |
857 | desc->hw.tcr, desc->hw.sar, desc->hw.dar); | |
3542a113 | 858 | /* Get the ld start address from ld_queue */ |
47a4dc26 | 859 | dmae_set_reg(sh_chan, &desc->hw); |
3542a113 GL |
860 | dmae_start(sh_chan); |
861 | break; | |
862 | } | |
d8902adc NI |
863 | } |
864 | ||
865 | static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan) | |
866 | { | |
867 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); | |
7a1cd9ad GL |
868 | |
869 | spin_lock_irq(&sh_chan->desc_lock); | |
870 | if (sh_chan->pm_state == DMAE_PM_ESTABLISHED) | |
871 | sh_chan_xfer_ld_queue(sh_chan); | |
872 | else | |
873 | sh_chan->pm_state = DMAE_PM_PENDING; | |
874 | spin_unlock_irq(&sh_chan->desc_lock); | |
d8902adc NI |
875 | } |
876 | ||
07934481 | 877 | static enum dma_status sh_dmae_tx_status(struct dma_chan *chan, |
d8902adc | 878 | dma_cookie_t cookie, |
07934481 | 879 | struct dma_tx_state *txstate) |
d8902adc NI |
880 | { |
881 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); | |
47a4dc26 | 882 | enum dma_status status; |
b4dae6e1 | 883 | unsigned long flags; |
d8902adc | 884 | |
3542a113 | 885 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
d8902adc | 886 | |
b4dae6e1 | 887 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
47a4dc26 | 888 | |
96a2af41 | 889 | status = dma_cookie_status(chan, cookie, txstate); |
47a4dc26 GL |
890 | |
891 | /* | |
892 | * If we don't find cookie on the queue, it has been aborted and we have | |
893 | * to report error | |
894 | */ | |
895 | if (status != DMA_SUCCESS) { | |
896 | struct sh_desc *desc; | |
897 | status = DMA_ERROR; | |
898 | list_for_each_entry(desc, &sh_chan->ld_queue, node) | |
899 | if (desc->cookie == cookie) { | |
900 | status = DMA_IN_PROGRESS; | |
901 | break; | |
902 | } | |
903 | } | |
904 | ||
b4dae6e1 | 905 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
47a4dc26 GL |
906 | |
907 | return status; | |
d8902adc NI |
908 | } |
909 | ||
910 | static irqreturn_t sh_dmae_interrupt(int irq, void *data) | |
911 | { | |
912 | irqreturn_t ret = IRQ_NONE; | |
2dc66667 GL |
913 | struct sh_dmae_chan *sh_chan = data; |
914 | u32 chcr; | |
915 | ||
916 | spin_lock(&sh_chan->desc_lock); | |
917 | ||
5899a723 | 918 | chcr = chcr_read(sh_chan); |
d8902adc NI |
919 | |
920 | if (chcr & CHCR_TE) { | |
921 | /* DMA stop */ | |
922 | dmae_halt(sh_chan); | |
923 | ||
924 | ret = IRQ_HANDLED; | |
925 | tasklet_schedule(&sh_chan->tasklet); | |
926 | } | |
927 | ||
2dc66667 GL |
928 | spin_unlock(&sh_chan->desc_lock); |
929 | ||
d8902adc NI |
930 | return ret; |
931 | } | |
932 | ||
2dc66667 GL |
933 | /* Called from error IRQ or NMI */ |
934 | static bool sh_dmae_reset(struct sh_dmae_device *shdev) | |
d8902adc | 935 | { |
03aa18f5 | 936 | unsigned int handled = 0; |
47a4dc26 | 937 | int i; |
d8902adc | 938 | |
47a4dc26 | 939 | /* halt the dma controller */ |
027811b9 | 940 | sh_dmae_ctl_stop(shdev); |
47a4dc26 GL |
941 | |
942 | /* We cannot detect, which channel caused the error, have to reset all */ | |
8b1935e6 | 943 | for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) { |
47a4dc26 | 944 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
03aa18f5 | 945 | struct sh_desc *desc; |
2dc66667 | 946 | LIST_HEAD(dl); |
03aa18f5 PM |
947 | |
948 | if (!sh_chan) | |
949 | continue; | |
950 | ||
2dc66667 GL |
951 | spin_lock(&sh_chan->desc_lock); |
952 | ||
03aa18f5 PM |
953 | /* Stop the channel */ |
954 | dmae_halt(sh_chan); | |
955 | ||
2dc66667 GL |
956 | list_splice_init(&sh_chan->ld_queue, &dl); |
957 | ||
7a1cd9ad GL |
958 | if (!list_empty(&dl)) { |
959 | dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id); | |
960 | pm_runtime_put(sh_chan->dev); | |
961 | } | |
962 | sh_chan->pm_state = DMAE_PM_ESTABLISHED; | |
963 | ||
2dc66667 GL |
964 | spin_unlock(&sh_chan->desc_lock); |
965 | ||
03aa18f5 | 966 | /* Complete all */ |
2dc66667 | 967 | list_for_each_entry(desc, &dl, node) { |
03aa18f5 PM |
968 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
969 | desc->mark = DESC_IDLE; | |
970 | if (tx->callback) | |
971 | tx->callback(tx->callback_param); | |
d8902adc | 972 | } |
03aa18f5 | 973 | |
2dc66667 GL |
974 | spin_lock(&sh_chan->desc_lock); |
975 | list_splice(&dl, &sh_chan->ld_free); | |
976 | spin_unlock(&sh_chan->desc_lock); | |
977 | ||
03aa18f5 | 978 | handled++; |
d8902adc | 979 | } |
03aa18f5 | 980 | |
027811b9 | 981 | sh_dmae_rst(shdev); |
47a4dc26 | 982 | |
03aa18f5 PM |
983 | return !!handled; |
984 | } | |
985 | ||
986 | static irqreturn_t sh_dmae_err(int irq, void *data) | |
987 | { | |
ff7690b4 YS |
988 | struct sh_dmae_device *shdev = data; |
989 | ||
2dc66667 | 990 | if (!(dmaor_read(shdev) & DMAOR_AE)) |
ff7690b4 | 991 | return IRQ_NONE; |
2dc66667 GL |
992 | |
993 | sh_dmae_reset(data); | |
994 | return IRQ_HANDLED; | |
d8902adc | 995 | } |
d8902adc NI |
996 | |
997 | static void dmae_do_tasklet(unsigned long data) | |
998 | { | |
999 | struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; | |
3542a113 | 1000 | struct sh_desc *desc; |
d8902adc | 1001 | u32 sar_buf = sh_dmae_readl(sh_chan, SAR); |
cfefe997 | 1002 | u32 dar_buf = sh_dmae_readl(sh_chan, DAR); |
86d61b33 | 1003 | |
b4dae6e1 | 1004 | spin_lock_irq(&sh_chan->desc_lock); |
3542a113 | 1005 | list_for_each_entry(desc, &sh_chan->ld_queue, node) { |
cfefe997 | 1006 | if (desc->mark == DESC_SUBMITTED && |
db8196df | 1007 | ((desc->direction == DMA_DEV_TO_MEM && |
cfefe997 GL |
1008 | (desc->hw.dar + desc->hw.tcr) == dar_buf) || |
1009 | (desc->hw.sar + desc->hw.tcr) == sar_buf)) { | |
3542a113 GL |
1010 | dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n", |
1011 | desc->async_tx.cookie, &desc->async_tx, | |
1012 | desc->hw.dar); | |
1013 | desc->mark = DESC_COMPLETED; | |
d8902adc NI |
1014 | break; |
1015 | } | |
1016 | } | |
d8902adc NI |
1017 | /* Next desc */ |
1018 | sh_chan_xfer_ld_queue(sh_chan); | |
7a1cd9ad GL |
1019 | spin_unlock_irq(&sh_chan->desc_lock); |
1020 | ||
3542a113 | 1021 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
d8902adc NI |
1022 | } |
1023 | ||
03aa18f5 PM |
1024 | static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) |
1025 | { | |
03aa18f5 PM |
1026 | /* Fast path out if NMIF is not asserted for this controller */ |
1027 | if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) | |
1028 | return false; | |
1029 | ||
2dc66667 | 1030 | return sh_dmae_reset(shdev); |
03aa18f5 PM |
1031 | } |
1032 | ||
1033 | static int sh_dmae_nmi_handler(struct notifier_block *self, | |
1034 | unsigned long cmd, void *data) | |
1035 | { | |
1036 | struct sh_dmae_device *shdev; | |
1037 | int ret = NOTIFY_DONE; | |
1038 | bool triggered; | |
1039 | ||
1040 | /* | |
1041 | * Only concern ourselves with NMI events. | |
1042 | * | |
1043 | * Normally we would check the die chain value, but as this needs | |
1044 | * to be architecture independent, check for NMI context instead. | |
1045 | */ | |
1046 | if (!in_nmi()) | |
1047 | return NOTIFY_DONE; | |
1048 | ||
1049 | rcu_read_lock(); | |
1050 | list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { | |
1051 | /* | |
1052 | * Only stop if one of the controllers has NMIF asserted, | |
1053 | * we do not want to interfere with regular address error | |
1054 | * handling or NMI events that don't concern the DMACs. | |
1055 | */ | |
1056 | triggered = sh_dmae_nmi_notify(shdev); | |
1057 | if (triggered == true) | |
1058 | ret = NOTIFY_OK; | |
1059 | } | |
1060 | rcu_read_unlock(); | |
1061 | ||
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { | |
1066 | .notifier_call = sh_dmae_nmi_handler, | |
1067 | ||
1068 | /* Run before NMI debug handler and KGDB */ | |
1069 | .priority = 1, | |
1070 | }; | |
1071 | ||
027811b9 GL |
1072 | static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, |
1073 | int irq, unsigned long flags) | |
d8902adc NI |
1074 | { |
1075 | int err; | |
5bac942d | 1076 | const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; |
027811b9 | 1077 | struct platform_device *pdev = to_platform_device(shdev->common.dev); |
d8902adc NI |
1078 | struct sh_dmae_chan *new_sh_chan; |
1079 | ||
1080 | /* alloc channel */ | |
1081 | new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); | |
1082 | if (!new_sh_chan) { | |
86d61b33 GL |
1083 | dev_err(shdev->common.dev, |
1084 | "No free memory for allocating dma channels!\n"); | |
d8902adc NI |
1085 | return -ENOMEM; |
1086 | } | |
1087 | ||
7a1cd9ad GL |
1088 | new_sh_chan->pm_state = DMAE_PM_ESTABLISHED; |
1089 | ||
1090 | /* reference struct dma_device */ | |
8b1935e6 | 1091 | new_sh_chan->common.device = &shdev->common; |
8ac69546 | 1092 | dma_cookie_init(&new_sh_chan->common); |
8b1935e6 | 1093 | |
d8902adc NI |
1094 | new_sh_chan->dev = shdev->common.dev; |
1095 | new_sh_chan->id = id; | |
027811b9 GL |
1096 | new_sh_chan->irq = irq; |
1097 | new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32); | |
d8902adc NI |
1098 | |
1099 | /* Init DMA tasklet */ | |
1100 | tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet, | |
1101 | (unsigned long)new_sh_chan); | |
1102 | ||
d8902adc NI |
1103 | spin_lock_init(&new_sh_chan->desc_lock); |
1104 | ||
1105 | /* Init descripter manage list */ | |
1106 | INIT_LIST_HEAD(&new_sh_chan->ld_queue); | |
1107 | INIT_LIST_HEAD(&new_sh_chan->ld_free); | |
1108 | ||
d8902adc NI |
1109 | /* Add the channel to DMA device channel list */ |
1110 | list_add_tail(&new_sh_chan->common.device_node, | |
1111 | &shdev->common.channels); | |
1112 | shdev->common.chancnt++; | |
1113 | ||
027811b9 GL |
1114 | if (pdev->id >= 0) |
1115 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), | |
1116 | "sh-dmae%d.%d", pdev->id, new_sh_chan->id); | |
1117 | else | |
1118 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), | |
1119 | "sh-dma%d", new_sh_chan->id); | |
d8902adc NI |
1120 | |
1121 | /* set up channel irq */ | |
027811b9 | 1122 | err = request_irq(irq, &sh_dmae_interrupt, flags, |
86d61b33 | 1123 | new_sh_chan->dev_id, new_sh_chan); |
d8902adc NI |
1124 | if (err) { |
1125 | dev_err(shdev->common.dev, "DMA channel %d request_irq error " | |
1126 | "with return %d\n", id, err); | |
1127 | goto err_no_irq; | |
1128 | } | |
1129 | ||
d8902adc NI |
1130 | shdev->chan[id] = new_sh_chan; |
1131 | return 0; | |
1132 | ||
1133 | err_no_irq: | |
1134 | /* remove from dmaengine device node */ | |
1135 | list_del(&new_sh_chan->common.device_node); | |
1136 | kfree(new_sh_chan); | |
1137 | return err; | |
1138 | } | |
1139 | ||
1140 | static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) | |
1141 | { | |
1142 | int i; | |
1143 | ||
1144 | for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) { | |
1145 | if (shdev->chan[i]) { | |
027811b9 GL |
1146 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
1147 | ||
1148 | free_irq(sh_chan->irq, sh_chan); | |
d8902adc | 1149 | |
027811b9 GL |
1150 | list_del(&sh_chan->common.device_node); |
1151 | kfree(sh_chan); | |
d8902adc NI |
1152 | shdev->chan[i] = NULL; |
1153 | } | |
1154 | } | |
1155 | shdev->common.chancnt = 0; | |
1156 | } | |
1157 | ||
1158 | static int __init sh_dmae_probe(struct platform_device *pdev) | |
1159 | { | |
027811b9 GL |
1160 | struct sh_dmae_pdata *pdata = pdev->dev.platform_data; |
1161 | unsigned long irqflags = IRQF_DISABLED, | |
8b1935e6 GL |
1162 | chan_flag[SH_DMAC_MAX_CHANNELS] = {}; |
1163 | int errirq, chan_irq[SH_DMAC_MAX_CHANNELS]; | |
300e5f97 | 1164 | int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; |
d8902adc | 1165 | struct sh_dmae_device *shdev; |
027811b9 | 1166 | struct resource *chan, *dmars, *errirq_res, *chanirq_res; |
d8902adc | 1167 | |
56adf7e8 | 1168 | /* get platform data */ |
027811b9 | 1169 | if (!pdata || !pdata->channel_num) |
56adf7e8 DW |
1170 | return -ENODEV; |
1171 | ||
027811b9 | 1172 | chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
26fc02ab | 1173 | /* DMARS area is optional */ |
027811b9 GL |
1174 | dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
1175 | /* | |
1176 | * IRQ resources: | |
1177 | * 1. there always must be at least one IRQ IO-resource. On SH4 it is | |
1178 | * the error IRQ, in which case it is the only IRQ in this resource: | |
1179 | * start == end. If it is the only IRQ resource, all channels also | |
1180 | * use the same IRQ. | |
1181 | * 2. DMA channel IRQ resources can be specified one per resource or in | |
1182 | * ranges (start != end) | |
1183 | * 3. iff all events (channels and, optionally, error) on this | |
1184 | * controller use the same IRQ, only one IRQ resource can be | |
1185 | * specified, otherwise there must be one IRQ per channel, even if | |
1186 | * some of them are equal | |
1187 | * 4. if all IRQs on this controller are equal or if some specific IRQs | |
1188 | * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be | |
1189 | * requested with the IRQF_SHARED flag | |
1190 | */ | |
1191 | errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
1192 | if (!chan || !errirq_res) | |
1193 | return -ENODEV; | |
1194 | ||
1195 | if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) { | |
1196 | dev_err(&pdev->dev, "DMAC register region already claimed\n"); | |
1197 | return -EBUSY; | |
1198 | } | |
1199 | ||
1200 | if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) { | |
1201 | dev_err(&pdev->dev, "DMAC DMARS region already claimed\n"); | |
1202 | err = -EBUSY; | |
1203 | goto ermrdmars; | |
1204 | } | |
1205 | ||
1206 | err = -ENOMEM; | |
d8902adc NI |
1207 | shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL); |
1208 | if (!shdev) { | |
027811b9 GL |
1209 | dev_err(&pdev->dev, "Not enough memory\n"); |
1210 | goto ealloc; | |
1211 | } | |
1212 | ||
1213 | shdev->chan_reg = ioremap(chan->start, resource_size(chan)); | |
1214 | if (!shdev->chan_reg) | |
1215 | goto emapchan; | |
1216 | if (dmars) { | |
1217 | shdev->dmars = ioremap(dmars->start, resource_size(dmars)); | |
1218 | if (!shdev->dmars) | |
1219 | goto emapdmars; | |
d8902adc NI |
1220 | } |
1221 | ||
d8902adc | 1222 | /* platform data */ |
027811b9 | 1223 | shdev->pdata = pdata; |
d8902adc | 1224 | |
5899a723 KM |
1225 | if (pdata->chcr_offset) |
1226 | shdev->chcr_offset = pdata->chcr_offset; | |
1227 | else | |
1228 | shdev->chcr_offset = CHCR; | |
1229 | ||
67c6269e KM |
1230 | if (pdata->chcr_ie_bit) |
1231 | shdev->chcr_ie_bit = pdata->chcr_ie_bit; | |
1232 | else | |
1233 | shdev->chcr_ie_bit = CHCR_IE; | |
1234 | ||
5c2de444 PM |
1235 | platform_set_drvdata(pdev, shdev); |
1236 | ||
c11b46c3 GL |
1237 | shdev->common.dev = &pdev->dev; |
1238 | ||
20f2a3b5 GL |
1239 | pm_runtime_enable(&pdev->dev); |
1240 | pm_runtime_get_sync(&pdev->dev); | |
1241 | ||
31705e21 | 1242 | spin_lock_irq(&sh_dmae_lock); |
03aa18f5 | 1243 | list_add_tail_rcu(&shdev->node, &sh_dmae_devices); |
31705e21 | 1244 | spin_unlock_irq(&sh_dmae_lock); |
03aa18f5 | 1245 | |
2dc66667 | 1246 | /* reset dma controller - only needed as a test */ |
027811b9 | 1247 | err = sh_dmae_rst(shdev); |
d8902adc NI |
1248 | if (err) |
1249 | goto rst_err; | |
1250 | ||
d8902adc NI |
1251 | INIT_LIST_HEAD(&shdev->common.channels); |
1252 | ||
e9c8d7a0 GL |
1253 | if (!pdata->slave_only) |
1254 | dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask); | |
26fc02ab | 1255 | if (pdata->slave && pdata->slave_num) |
027811b9 | 1256 | dma_cap_set(DMA_SLAVE, shdev->common.cap_mask); |
cfefe997 | 1257 | |
d8902adc NI |
1258 | shdev->common.device_alloc_chan_resources |
1259 | = sh_dmae_alloc_chan_resources; | |
1260 | shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources; | |
1261 | shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy; | |
07934481 | 1262 | shdev->common.device_tx_status = sh_dmae_tx_status; |
d8902adc | 1263 | shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending; |
cfefe997 GL |
1264 | |
1265 | /* Compulsory for DMA_SLAVE fields */ | |
1266 | shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg; | |
c3635c78 | 1267 | shdev->common.device_control = sh_dmae_control; |
cfefe997 | 1268 | |
ddb4f0f0 | 1269 | /* Default transfer size of 32 bytes requires 32-byte alignment */ |
8b1935e6 | 1270 | shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE; |
d8902adc | 1271 | |
927a7c9c | 1272 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
027811b9 GL |
1273 | chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); |
1274 | ||
1275 | if (!chanirq_res) | |
1276 | chanirq_res = errirq_res; | |
1277 | else | |
1278 | irqres++; | |
1279 | ||
1280 | if (chanirq_res == errirq_res || | |
1281 | (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) | |
d8902adc | 1282 | irqflags = IRQF_SHARED; |
027811b9 GL |
1283 | |
1284 | errirq = errirq_res->start; | |
1285 | ||
1286 | err = request_irq(errirq, sh_dmae_err, irqflags, | |
1287 | "DMAC Address Error", shdev); | |
1288 | if (err) { | |
1289 | dev_err(&pdev->dev, | |
1290 | "DMA failed requesting irq #%d, error %d\n", | |
1291 | errirq, err); | |
1292 | goto eirq_err; | |
d8902adc NI |
1293 | } |
1294 | ||
027811b9 GL |
1295 | #else |
1296 | chanirq_res = errirq_res; | |
927a7c9c | 1297 | #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ |
027811b9 GL |
1298 | |
1299 | if (chanirq_res->start == chanirq_res->end && | |
1300 | !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { | |
1301 | /* Special case - all multiplexed */ | |
1302 | for (; irq_cnt < pdata->channel_num; irq_cnt++) { | |
300e5f97 MD |
1303 | if (irq_cnt < SH_DMAC_MAX_CHANNELS) { |
1304 | chan_irq[irq_cnt] = chanirq_res->start; | |
1305 | chan_flag[irq_cnt] = IRQF_SHARED; | |
1306 | } else { | |
1307 | irq_cap = 1; | |
1308 | break; | |
1309 | } | |
d8902adc | 1310 | } |
027811b9 GL |
1311 | } else { |
1312 | do { | |
1313 | for (i = chanirq_res->start; i <= chanirq_res->end; i++) { | |
dcee0bb7 MD |
1314 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) { |
1315 | irq_cap = 1; | |
1316 | break; | |
1317 | } | |
1318 | ||
027811b9 GL |
1319 | if ((errirq_res->flags & IORESOURCE_BITS) == |
1320 | IORESOURCE_IRQ_SHAREABLE) | |
1321 | chan_flag[irq_cnt] = IRQF_SHARED; | |
1322 | else | |
1323 | chan_flag[irq_cnt] = IRQF_DISABLED; | |
1324 | dev_dbg(&pdev->dev, | |
1325 | "Found IRQ %d for channel %d\n", | |
1326 | i, irq_cnt); | |
1327 | chan_irq[irq_cnt++] = i; | |
300e5f97 MD |
1328 | } |
1329 | ||
dcee0bb7 | 1330 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) |
300e5f97 | 1331 | break; |
dcee0bb7 | 1332 | |
027811b9 GL |
1333 | chanirq_res = platform_get_resource(pdev, |
1334 | IORESOURCE_IRQ, ++irqres); | |
1335 | } while (irq_cnt < pdata->channel_num && chanirq_res); | |
d8902adc | 1336 | } |
027811b9 | 1337 | |
d8902adc | 1338 | /* Create DMA Channel */ |
300e5f97 | 1339 | for (i = 0; i < irq_cnt; i++) { |
027811b9 | 1340 | err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); |
d8902adc NI |
1341 | if (err) |
1342 | goto chan_probe_err; | |
1343 | } | |
1344 | ||
300e5f97 MD |
1345 | if (irq_cap) |
1346 | dev_notice(&pdev->dev, "Attempting to register %d DMA " | |
1347 | "channels when a maximum of %d are supported.\n", | |
1348 | pdata->channel_num, SH_DMAC_MAX_CHANNELS); | |
1349 | ||
20f2a3b5 GL |
1350 | pm_runtime_put(&pdev->dev); |
1351 | ||
d8902adc NI |
1352 | dma_async_device_register(&shdev->common); |
1353 | ||
1354 | return err; | |
1355 | ||
1356 | chan_probe_err: | |
1357 | sh_dmae_chan_remove(shdev); | |
300e5f97 | 1358 | |
927a7c9c | 1359 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
027811b9 | 1360 | free_irq(errirq, shdev); |
d8902adc | 1361 | eirq_err: |
027811b9 | 1362 | #endif |
d8902adc | 1363 | rst_err: |
31705e21 | 1364 | spin_lock_irq(&sh_dmae_lock); |
03aa18f5 | 1365 | list_del_rcu(&shdev->node); |
31705e21 | 1366 | spin_unlock_irq(&sh_dmae_lock); |
03aa18f5 | 1367 | |
20f2a3b5 | 1368 | pm_runtime_put(&pdev->dev); |
467017b8 GL |
1369 | pm_runtime_disable(&pdev->dev); |
1370 | ||
027811b9 GL |
1371 | if (dmars) |
1372 | iounmap(shdev->dmars); | |
5c2de444 PM |
1373 | |
1374 | platform_set_drvdata(pdev, NULL); | |
027811b9 GL |
1375 | emapdmars: |
1376 | iounmap(shdev->chan_reg); | |
31705e21 | 1377 | synchronize_rcu(); |
027811b9 | 1378 | emapchan: |
d8902adc | 1379 | kfree(shdev); |
027811b9 GL |
1380 | ealloc: |
1381 | if (dmars) | |
1382 | release_mem_region(dmars->start, resource_size(dmars)); | |
1383 | ermrdmars: | |
1384 | release_mem_region(chan->start, resource_size(chan)); | |
d8902adc | 1385 | |
d8902adc NI |
1386 | return err; |
1387 | } | |
1388 | ||
1389 | static int __exit sh_dmae_remove(struct platform_device *pdev) | |
1390 | { | |
1391 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); | |
027811b9 GL |
1392 | struct resource *res; |
1393 | int errirq = platform_get_irq(pdev, 0); | |
d8902adc NI |
1394 | |
1395 | dma_async_device_unregister(&shdev->common); | |
1396 | ||
027811b9 GL |
1397 | if (errirq > 0) |
1398 | free_irq(errirq, shdev); | |
d8902adc | 1399 | |
31705e21 | 1400 | spin_lock_irq(&sh_dmae_lock); |
03aa18f5 | 1401 | list_del_rcu(&shdev->node); |
31705e21 | 1402 | spin_unlock_irq(&sh_dmae_lock); |
03aa18f5 | 1403 | |
d8902adc NI |
1404 | /* channel data remove */ |
1405 | sh_dmae_chan_remove(shdev); | |
1406 | ||
20f2a3b5 GL |
1407 | pm_runtime_disable(&pdev->dev); |
1408 | ||
027811b9 GL |
1409 | if (shdev->dmars) |
1410 | iounmap(shdev->dmars); | |
1411 | iounmap(shdev->chan_reg); | |
1412 | ||
5c2de444 PM |
1413 | platform_set_drvdata(pdev, NULL); |
1414 | ||
31705e21 | 1415 | synchronize_rcu(); |
d8902adc NI |
1416 | kfree(shdev); |
1417 | ||
027811b9 GL |
1418 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1419 | if (res) | |
1420 | release_mem_region(res->start, resource_size(res)); | |
1421 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
1422 | if (res) | |
1423 | release_mem_region(res->start, resource_size(res)); | |
1424 | ||
d8902adc NI |
1425 | return 0; |
1426 | } | |
1427 | ||
1428 | static void sh_dmae_shutdown(struct platform_device *pdev) | |
1429 | { | |
1430 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); | |
027811b9 | 1431 | sh_dmae_ctl_stop(shdev); |
d8902adc NI |
1432 | } |
1433 | ||
467017b8 GL |
1434 | static int sh_dmae_runtime_suspend(struct device *dev) |
1435 | { | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static int sh_dmae_runtime_resume(struct device *dev) | |
1440 | { | |
1441 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); | |
1442 | ||
1443 | return sh_dmae_rst(shdev); | |
1444 | } | |
1445 | ||
1446 | #ifdef CONFIG_PM | |
1447 | static int sh_dmae_suspend(struct device *dev) | |
1448 | { | |
467017b8 GL |
1449 | return 0; |
1450 | } | |
1451 | ||
1452 | static int sh_dmae_resume(struct device *dev) | |
1453 | { | |
1454 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); | |
c11b46c3 GL |
1455 | int i, ret; |
1456 | ||
1457 | ret = sh_dmae_rst(shdev); | |
1458 | if (ret < 0) | |
1459 | dev_err(dev, "Failed to reset!\n"); | |
467017b8 GL |
1460 | |
1461 | for (i = 0; i < shdev->pdata->channel_num; i++) { | |
1462 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; | |
1463 | struct sh_dmae_slave *param = sh_chan->common.private; | |
1464 | ||
1465 | if (!sh_chan->descs_allocated) | |
1466 | continue; | |
1467 | ||
467017b8 GL |
1468 | if (param) { |
1469 | const struct sh_dmae_slave_config *cfg = param->config; | |
1470 | dmae_set_dmars(sh_chan, cfg->mid_rid); | |
1471 | dmae_set_chcr(sh_chan, cfg->chcr); | |
1472 | } else { | |
1473 | dmae_init(sh_chan); | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | #else | |
1480 | #define sh_dmae_suspend NULL | |
1481 | #define sh_dmae_resume NULL | |
1482 | #endif | |
1483 | ||
1484 | const struct dev_pm_ops sh_dmae_pm = { | |
1485 | .suspend = sh_dmae_suspend, | |
1486 | .resume = sh_dmae_resume, | |
1487 | .runtime_suspend = sh_dmae_runtime_suspend, | |
1488 | .runtime_resume = sh_dmae_runtime_resume, | |
1489 | }; | |
1490 | ||
d8902adc NI |
1491 | static struct platform_driver sh_dmae_driver = { |
1492 | .remove = __exit_p(sh_dmae_remove), | |
1493 | .shutdown = sh_dmae_shutdown, | |
1494 | .driver = { | |
7a5c106a | 1495 | .owner = THIS_MODULE, |
d8902adc | 1496 | .name = "sh-dma-engine", |
467017b8 | 1497 | .pm = &sh_dmae_pm, |
d8902adc NI |
1498 | }, |
1499 | }; | |
1500 | ||
1501 | static int __init sh_dmae_init(void) | |
1502 | { | |
661382fe GL |
1503 | /* Wire up NMI handling */ |
1504 | int err = register_die_notifier(&sh_dmae_nmi_notifier); | |
1505 | if (err) | |
1506 | return err; | |
1507 | ||
d8902adc NI |
1508 | return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); |
1509 | } | |
1510 | module_init(sh_dmae_init); | |
1511 | ||
1512 | static void __exit sh_dmae_exit(void) | |
1513 | { | |
1514 | platform_driver_unregister(&sh_dmae_driver); | |
661382fe GL |
1515 | |
1516 | unregister_die_notifier(&sh_dmae_nmi_notifier); | |
d8902adc NI |
1517 | } |
1518 | module_exit(sh_dmae_exit); | |
1519 | ||
1520 | MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); | |
1521 | MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); | |
1522 | MODULE_LICENSE("GPL"); | |
e5843341 | 1523 | MODULE_ALIAS("platform:sh-dma-engine"); |