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6b4cd727 PG |
1 | /* |
2 | * DMA driver for STMicroelectronics STi FDMA controller | |
3 | * | |
4 | * Copyright (C) 2014 STMicroelectronics | |
5 | * | |
6 | * Author: Ludovic Barre <Ludovic.barre@st.com> | |
7 | * Peter Griffin <peter.griffin@linaro.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_device.h> | |
18 | #include <linux/of_dma.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/remoteproc.h> | |
22 | ||
23 | #include "st_fdma.h" | |
24 | ||
25 | static inline struct st_fdma_chan *to_st_fdma_chan(struct dma_chan *c) | |
26 | { | |
27 | return container_of(c, struct st_fdma_chan, vchan.chan); | |
28 | } | |
29 | ||
30 | static struct st_fdma_desc *to_st_fdma_desc(struct virt_dma_desc *vd) | |
31 | { | |
32 | return container_of(vd, struct st_fdma_desc, vdesc); | |
33 | } | |
34 | ||
35 | static int st_fdma_dreq_get(struct st_fdma_chan *fchan) | |
36 | { | |
37 | struct st_fdma_dev *fdev = fchan->fdev; | |
38 | u32 req_line_cfg = fchan->cfg.req_line; | |
39 | u32 dreq_line; | |
40 | int try = 0; | |
41 | ||
42 | /* | |
43 | * dreq_mask is shared for n channels of fdma, so all accesses must be | |
44 | * atomic. if the dreq_mask is changed between ffz and set_bit, | |
45 | * we retry | |
46 | */ | |
47 | do { | |
48 | if (fdev->dreq_mask == ~0L) { | |
49 | dev_err(fdev->dev, "No req lines available\n"); | |
50 | return -EINVAL; | |
51 | } | |
52 | ||
53 | if (try || req_line_cfg >= ST_FDMA_NR_DREQS) { | |
54 | dev_err(fdev->dev, "Invalid or used req line\n"); | |
55 | return -EINVAL; | |
56 | } else { | |
57 | dreq_line = req_line_cfg; | |
58 | } | |
59 | ||
60 | try++; | |
61 | } while (test_and_set_bit(dreq_line, &fdev->dreq_mask)); | |
62 | ||
63 | dev_dbg(fdev->dev, "get dreq_line:%d mask:%#lx\n", | |
64 | dreq_line, fdev->dreq_mask); | |
65 | ||
66 | return dreq_line; | |
67 | } | |
68 | ||
69 | static void st_fdma_dreq_put(struct st_fdma_chan *fchan) | |
70 | { | |
71 | struct st_fdma_dev *fdev = fchan->fdev; | |
72 | ||
73 | dev_dbg(fdev->dev, "put dreq_line:%#x\n", fchan->dreq_line); | |
74 | clear_bit(fchan->dreq_line, &fdev->dreq_mask); | |
75 | } | |
76 | ||
77 | static void st_fdma_xfer_desc(struct st_fdma_chan *fchan) | |
78 | { | |
79 | struct virt_dma_desc *vdesc; | |
80 | unsigned long nbytes, ch_cmd, cmd; | |
81 | ||
82 | vdesc = vchan_next_desc(&fchan->vchan); | |
83 | if (!vdesc) | |
84 | return; | |
85 | ||
86 | fchan->fdesc = to_st_fdma_desc(vdesc); | |
87 | nbytes = fchan->fdesc->node[0].desc->nbytes; | |
88 | cmd = FDMA_CMD_START(fchan->vchan.chan.chan_id); | |
89 | ch_cmd = fchan->fdesc->node[0].pdesc | FDMA_CH_CMD_STA_START; | |
90 | ||
91 | /* start the channel for the descriptor */ | |
92 | fnode_write(fchan, nbytes, FDMA_CNTN_OFST); | |
93 | fchan_write(fchan, ch_cmd, FDMA_CH_CMD_OFST); | |
94 | writel(cmd, | |
95 | fchan->fdev->slim_rproc->peri + FDMA_CMD_SET_OFST); | |
96 | ||
97 | dev_dbg(fchan->fdev->dev, "start chan:%d\n", fchan->vchan.chan.chan_id); | |
98 | } | |
99 | ||
100 | static void st_fdma_ch_sta_update(struct st_fdma_chan *fchan, | |
101 | unsigned long int_sta) | |
102 | { | |
103 | unsigned long ch_sta, ch_err; | |
104 | int ch_id = fchan->vchan.chan.chan_id; | |
105 | struct st_fdma_dev *fdev = fchan->fdev; | |
106 | ||
107 | ch_sta = fchan_read(fchan, FDMA_CH_CMD_OFST); | |
108 | ch_err = ch_sta & FDMA_CH_CMD_ERR_MASK; | |
109 | ch_sta &= FDMA_CH_CMD_STA_MASK; | |
110 | ||
111 | if (int_sta & FDMA_INT_STA_ERR) { | |
112 | dev_warn(fdev->dev, "chan:%d, error:%ld\n", ch_id, ch_err); | |
113 | fchan->status = DMA_ERROR; | |
114 | return; | |
115 | } | |
116 | ||
117 | switch (ch_sta) { | |
118 | case FDMA_CH_CMD_STA_PAUSED: | |
119 | fchan->status = DMA_PAUSED; | |
120 | break; | |
121 | ||
122 | case FDMA_CH_CMD_STA_RUNNING: | |
123 | fchan->status = DMA_IN_PROGRESS; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | static irqreturn_t st_fdma_irq_handler(int irq, void *dev_id) | |
129 | { | |
130 | struct st_fdma_dev *fdev = dev_id; | |
131 | irqreturn_t ret = IRQ_NONE; | |
132 | struct st_fdma_chan *fchan = &fdev->chans[0]; | |
133 | unsigned long int_sta, clr; | |
134 | ||
135 | int_sta = fdma_read(fdev, FDMA_INT_STA_OFST); | |
136 | clr = int_sta; | |
137 | ||
138 | for (; int_sta != 0 ; int_sta >>= 2, fchan++) { | |
139 | if (!(int_sta & (FDMA_INT_STA_CH | FDMA_INT_STA_ERR))) | |
140 | continue; | |
141 | ||
142 | spin_lock(&fchan->vchan.lock); | |
143 | st_fdma_ch_sta_update(fchan, int_sta); | |
144 | ||
145 | if (fchan->fdesc) { | |
146 | if (!fchan->fdesc->iscyclic) { | |
147 | list_del(&fchan->fdesc->vdesc.node); | |
148 | vchan_cookie_complete(&fchan->fdesc->vdesc); | |
149 | fchan->fdesc = NULL; | |
150 | fchan->status = DMA_COMPLETE; | |
151 | } else { | |
152 | vchan_cyclic_callback(&fchan->fdesc->vdesc); | |
153 | } | |
154 | ||
155 | /* Start the next descriptor (if available) */ | |
156 | if (!fchan->fdesc) | |
157 | st_fdma_xfer_desc(fchan); | |
158 | } | |
159 | ||
160 | spin_unlock(&fchan->vchan.lock); | |
161 | ret = IRQ_HANDLED; | |
162 | } | |
163 | ||
164 | fdma_write(fdev, clr, FDMA_INT_CLR_OFST); | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | static struct dma_chan *st_fdma_of_xlate(struct of_phandle_args *dma_spec, | |
170 | struct of_dma *ofdma) | |
171 | { | |
172 | struct st_fdma_dev *fdev = ofdma->of_dma_data; | |
173 | struct dma_chan *chan; | |
174 | struct st_fdma_chan *fchan; | |
175 | int ret; | |
176 | ||
177 | if (dma_spec->args_count < 1) | |
178 | return ERR_PTR(-EINVAL); | |
179 | ||
180 | if (fdev->dma_device.dev->of_node != dma_spec->np) | |
181 | return ERR_PTR(-EINVAL); | |
182 | ||
183 | ret = rproc_boot(fdev->slim_rproc->rproc); | |
184 | if (ret == -ENOENT) | |
185 | return ERR_PTR(-EPROBE_DEFER); | |
186 | else if (ret) | |
187 | return ERR_PTR(ret); | |
188 | ||
189 | chan = dma_get_any_slave_channel(&fdev->dma_device); | |
190 | if (!chan) | |
191 | goto err_chan; | |
192 | ||
193 | fchan = to_st_fdma_chan(chan); | |
194 | ||
195 | fchan->cfg.of_node = dma_spec->np; | |
196 | fchan->cfg.req_line = dma_spec->args[0]; | |
197 | fchan->cfg.req_ctrl = 0; | |
198 | fchan->cfg.type = ST_FDMA_TYPE_FREE_RUN; | |
199 | ||
200 | if (dma_spec->args_count > 1) | |
201 | fchan->cfg.req_ctrl = dma_spec->args[1] | |
202 | & FDMA_REQ_CTRL_CFG_MASK; | |
203 | ||
204 | if (dma_spec->args_count > 2) | |
205 | fchan->cfg.type = dma_spec->args[2]; | |
206 | ||
207 | if (fchan->cfg.type == ST_FDMA_TYPE_FREE_RUN) { | |
208 | fchan->dreq_line = 0; | |
209 | } else { | |
210 | fchan->dreq_line = st_fdma_dreq_get(fchan); | |
211 | if (IS_ERR_VALUE(fchan->dreq_line)) { | |
212 | chan = ERR_PTR(fchan->dreq_line); | |
213 | goto err_chan; | |
214 | } | |
215 | } | |
216 | ||
217 | dev_dbg(fdev->dev, "xlate req_line:%d type:%d req_ctrl:%#lx\n", | |
218 | fchan->cfg.req_line, fchan->cfg.type, fchan->cfg.req_ctrl); | |
219 | ||
220 | return chan; | |
221 | ||
222 | err_chan: | |
223 | rproc_shutdown(fdev->slim_rproc->rproc); | |
224 | return chan; | |
225 | ||
226 | } | |
227 | ||
228 | static void st_fdma_free_desc(struct virt_dma_desc *vdesc) | |
229 | { | |
230 | struct st_fdma_desc *fdesc; | |
231 | int i; | |
232 | ||
233 | fdesc = to_st_fdma_desc(vdesc); | |
234 | for (i = 0; i < fdesc->n_nodes; i++) | |
235 | dma_pool_free(fdesc->fchan->node_pool, fdesc->node[i].desc, | |
236 | fdesc->node[i].pdesc); | |
237 | kfree(fdesc); | |
238 | } | |
239 | ||
240 | static struct st_fdma_desc *st_fdma_alloc_desc(struct st_fdma_chan *fchan, | |
241 | int sg_len) | |
242 | { | |
243 | struct st_fdma_desc *fdesc; | |
244 | int i; | |
245 | ||
246 | fdesc = kzalloc(sizeof(*fdesc) + | |
247 | sizeof(struct st_fdma_sw_node) * sg_len, GFP_NOWAIT); | |
248 | if (!fdesc) | |
249 | return NULL; | |
250 | ||
251 | fdesc->fchan = fchan; | |
252 | fdesc->n_nodes = sg_len; | |
253 | for (i = 0; i < sg_len; i++) { | |
254 | fdesc->node[i].desc = dma_pool_alloc(fchan->node_pool, | |
255 | GFP_NOWAIT, &fdesc->node[i].pdesc); | |
256 | if (!fdesc->node[i].desc) | |
257 | goto err; | |
258 | } | |
259 | return fdesc; | |
260 | ||
261 | err: | |
262 | while (--i >= 0) | |
263 | dma_pool_free(fchan->node_pool, fdesc->node[i].desc, | |
264 | fdesc->node[i].pdesc); | |
265 | kfree(fdesc); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | static int st_fdma_alloc_chan_res(struct dma_chan *chan) | |
270 | { | |
271 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
272 | ||
273 | /* Create the dma pool for descriptor allocation */ | |
274 | fchan->node_pool = dma_pool_create(dev_name(&chan->dev->device), | |
275 | fchan->fdev->dev, | |
276 | sizeof(struct st_fdma_hw_node), | |
277 | __alignof__(struct st_fdma_hw_node), | |
278 | 0); | |
279 | ||
280 | if (!fchan->node_pool) { | |
281 | dev_err(fchan->fdev->dev, "unable to allocate desc pool\n"); | |
282 | return -ENOMEM; | |
283 | } | |
284 | ||
285 | dev_dbg(fchan->fdev->dev, "alloc ch_id:%d type:%d\n", | |
286 | fchan->vchan.chan.chan_id, fchan->cfg.type); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static void st_fdma_free_chan_res(struct dma_chan *chan) | |
292 | { | |
293 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
294 | struct rproc *rproc = fchan->fdev->slim_rproc->rproc; | |
295 | unsigned long flags; | |
296 | ||
297 | LIST_HEAD(head); | |
298 | ||
299 | dev_dbg(fchan->fdev->dev, "%s: freeing chan:%d\n", | |
300 | __func__, fchan->vchan.chan.chan_id); | |
301 | ||
302 | if (fchan->cfg.type != ST_FDMA_TYPE_FREE_RUN) | |
303 | st_fdma_dreq_put(fchan); | |
304 | ||
305 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
306 | fchan->fdesc = NULL; | |
307 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
308 | ||
309 | dma_pool_destroy(fchan->node_pool); | |
310 | fchan->node_pool = NULL; | |
311 | memset(&fchan->cfg, 0, sizeof(struct st_fdma_cfg)); | |
312 | ||
313 | rproc_shutdown(rproc); | |
314 | } | |
315 | ||
316 | static struct dma_async_tx_descriptor *st_fdma_prep_dma_memcpy( | |
317 | struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, | |
318 | size_t len, unsigned long flags) | |
319 | { | |
320 | struct st_fdma_chan *fchan; | |
321 | struct st_fdma_desc *fdesc; | |
322 | struct st_fdma_hw_node *hw_node; | |
323 | ||
324 | if (!len) | |
325 | return NULL; | |
326 | ||
327 | fchan = to_st_fdma_chan(chan); | |
328 | ||
329 | /* We only require a single descriptor */ | |
330 | fdesc = st_fdma_alloc_desc(fchan, 1); | |
331 | if (!fdesc) { | |
332 | dev_err(fchan->fdev->dev, "no memory for desc\n"); | |
333 | return NULL; | |
334 | } | |
335 | ||
336 | hw_node = fdesc->node[0].desc; | |
337 | hw_node->next = 0; | |
338 | hw_node->control = FDMA_NODE_CTRL_REQ_MAP_FREE_RUN; | |
339 | hw_node->control |= FDMA_NODE_CTRL_SRC_INCR; | |
340 | hw_node->control |= FDMA_NODE_CTRL_DST_INCR; | |
341 | hw_node->control |= FDMA_NODE_CTRL_INT_EON; | |
342 | hw_node->nbytes = len; | |
343 | hw_node->saddr = src; | |
344 | hw_node->daddr = dst; | |
345 | hw_node->generic.length = len; | |
346 | hw_node->generic.sstride = 0; | |
347 | hw_node->generic.dstride = 0; | |
348 | ||
349 | return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags); | |
350 | } | |
351 | ||
352 | static int config_reqctrl(struct st_fdma_chan *fchan, | |
353 | enum dma_transfer_direction direction) | |
354 | { | |
355 | u32 maxburst = 0, addr = 0; | |
356 | enum dma_slave_buswidth width; | |
357 | int ch_id = fchan->vchan.chan.chan_id; | |
358 | struct st_fdma_dev *fdev = fchan->fdev; | |
359 | ||
360 | switch (direction) { | |
361 | ||
362 | case DMA_DEV_TO_MEM: | |
363 | fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_WNR; | |
364 | maxburst = fchan->scfg.src_maxburst; | |
365 | width = fchan->scfg.src_addr_width; | |
366 | addr = fchan->scfg.src_addr; | |
367 | break; | |
368 | ||
369 | case DMA_MEM_TO_DEV: | |
370 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_WNR; | |
371 | maxburst = fchan->scfg.dst_maxburst; | |
372 | width = fchan->scfg.dst_addr_width; | |
373 | addr = fchan->scfg.dst_addr; | |
374 | break; | |
375 | ||
376 | default: | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_OPCODE_MASK; | |
381 | ||
382 | switch (width) { | |
383 | ||
384 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
385 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST1; | |
386 | break; | |
387 | ||
388 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
389 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST2; | |
390 | break; | |
391 | ||
392 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
393 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST4; | |
394 | break; | |
395 | ||
396 | case DMA_SLAVE_BUSWIDTH_8_BYTES: | |
397 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST8; | |
398 | break; | |
399 | ||
400 | default: | |
401 | return -EINVAL; | |
402 | } | |
403 | ||
404 | fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_NUM_OPS_MASK; | |
405 | fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_NUM_OPS(maxburst-1); | |
406 | dreq_write(fchan, fchan->cfg.req_ctrl, FDMA_REQ_CTRL_OFST); | |
407 | ||
408 | fchan->cfg.dev_addr = addr; | |
409 | fchan->cfg.dir = direction; | |
410 | ||
411 | dev_dbg(fdev->dev, "chan:%d config_reqctrl:%#x req_ctrl:%#lx\n", | |
412 | ch_id, addr, fchan->cfg.req_ctrl); | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static void fill_hw_node(struct st_fdma_hw_node *hw_node, | |
418 | struct st_fdma_chan *fchan, | |
419 | enum dma_transfer_direction direction) | |
420 | { | |
421 | if (direction == DMA_MEM_TO_DEV) { | |
422 | hw_node->control |= FDMA_NODE_CTRL_SRC_INCR; | |
423 | hw_node->control |= FDMA_NODE_CTRL_DST_STATIC; | |
424 | hw_node->daddr = fchan->cfg.dev_addr; | |
425 | } else { | |
426 | hw_node->control |= FDMA_NODE_CTRL_SRC_STATIC; | |
427 | hw_node->control |= FDMA_NODE_CTRL_DST_INCR; | |
428 | hw_node->saddr = fchan->cfg.dev_addr; | |
429 | } | |
430 | ||
431 | hw_node->generic.sstride = 0; | |
432 | hw_node->generic.dstride = 0; | |
433 | } | |
434 | ||
435 | static inline struct st_fdma_chan *st_fdma_prep_common(struct dma_chan *chan, | |
436 | size_t len, enum dma_transfer_direction direction) | |
437 | { | |
438 | struct st_fdma_chan *fchan; | |
439 | ||
440 | if (!chan || !len) | |
441 | return NULL; | |
442 | ||
443 | fchan = to_st_fdma_chan(chan); | |
444 | ||
445 | if (!is_slave_direction(direction)) { | |
446 | dev_err(fchan->fdev->dev, "bad direction?\n"); | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | return fchan; | |
451 | } | |
452 | ||
453 | static struct dma_async_tx_descriptor *st_fdma_prep_dma_cyclic( | |
454 | struct dma_chan *chan, dma_addr_t buf_addr, size_t len, | |
455 | size_t period_len, enum dma_transfer_direction direction, | |
456 | unsigned long flags) | |
457 | { | |
458 | struct st_fdma_chan *fchan; | |
459 | struct st_fdma_desc *fdesc; | |
460 | int sg_len, i; | |
461 | ||
462 | fchan = st_fdma_prep_common(chan, len, direction); | |
463 | if (!fchan) | |
464 | return NULL; | |
465 | ||
466 | if (!period_len) | |
467 | return NULL; | |
468 | ||
469 | if (config_reqctrl(fchan, direction)) { | |
470 | dev_err(fchan->fdev->dev, "bad width or direction\n"); | |
471 | return NULL; | |
472 | } | |
473 | ||
474 | /* the buffer length must be a multiple of period_len */ | |
475 | if (len % period_len != 0) { | |
476 | dev_err(fchan->fdev->dev, "len is not multiple of period\n"); | |
477 | return NULL; | |
478 | } | |
479 | ||
480 | sg_len = len / period_len; | |
481 | fdesc = st_fdma_alloc_desc(fchan, sg_len); | |
482 | if (!fdesc) { | |
483 | dev_err(fchan->fdev->dev, "no memory for desc\n"); | |
484 | return NULL; | |
485 | } | |
486 | ||
487 | fdesc->iscyclic = true; | |
488 | ||
489 | for (i = 0; i < sg_len; i++) { | |
490 | struct st_fdma_hw_node *hw_node = fdesc->node[i].desc; | |
491 | ||
492 | hw_node->next = fdesc->node[(i + 1) % sg_len].pdesc; | |
493 | ||
494 | hw_node->control = | |
495 | FDMA_NODE_CTRL_REQ_MAP_DREQ(fchan->dreq_line); | |
496 | hw_node->control |= FDMA_NODE_CTRL_INT_EON; | |
497 | ||
498 | fill_hw_node(hw_node, fchan, direction); | |
499 | ||
500 | if (direction == DMA_MEM_TO_DEV) | |
501 | hw_node->saddr = buf_addr + (i * period_len); | |
502 | else | |
503 | hw_node->daddr = buf_addr + (i * period_len); | |
504 | ||
505 | hw_node->nbytes = period_len; | |
506 | hw_node->generic.length = period_len; | |
507 | } | |
508 | ||
509 | return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags); | |
510 | } | |
511 | ||
512 | static struct dma_async_tx_descriptor *st_fdma_prep_slave_sg( | |
513 | struct dma_chan *chan, struct scatterlist *sgl, | |
514 | unsigned int sg_len, enum dma_transfer_direction direction, | |
515 | unsigned long flags, void *context) | |
516 | { | |
517 | struct st_fdma_chan *fchan; | |
518 | struct st_fdma_desc *fdesc; | |
519 | struct st_fdma_hw_node *hw_node; | |
520 | struct scatterlist *sg; | |
521 | int i; | |
522 | ||
523 | fchan = st_fdma_prep_common(chan, sg_len, direction); | |
524 | if (!fchan) | |
525 | return NULL; | |
526 | ||
527 | if (!sgl) | |
528 | return NULL; | |
529 | ||
530 | fdesc = st_fdma_alloc_desc(fchan, sg_len); | |
531 | if (!fdesc) { | |
532 | dev_err(fchan->fdev->dev, "no memory for desc\n"); | |
533 | return NULL; | |
534 | } | |
535 | ||
536 | fdesc->iscyclic = false; | |
537 | ||
538 | for_each_sg(sgl, sg, sg_len, i) { | |
539 | hw_node = fdesc->node[i].desc; | |
540 | ||
541 | hw_node->next = fdesc->node[(i + 1) % sg_len].pdesc; | |
542 | hw_node->control = FDMA_NODE_CTRL_REQ_MAP_DREQ(fchan->dreq_line); | |
543 | ||
544 | fill_hw_node(hw_node, fchan, direction); | |
545 | ||
546 | if (direction == DMA_MEM_TO_DEV) | |
547 | hw_node->saddr = sg_dma_address(sg); | |
548 | else | |
549 | hw_node->daddr = sg_dma_address(sg); | |
550 | ||
551 | hw_node->nbytes = sg_dma_len(sg); | |
552 | hw_node->generic.length = sg_dma_len(sg); | |
553 | } | |
554 | ||
555 | /* interrupt at end of last node */ | |
556 | hw_node->control |= FDMA_NODE_CTRL_INT_EON; | |
557 | ||
558 | return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags); | |
559 | } | |
560 | ||
561 | static size_t st_fdma_desc_residue(struct st_fdma_chan *fchan, | |
562 | struct virt_dma_desc *vdesc, | |
563 | bool in_progress) | |
564 | { | |
565 | struct st_fdma_desc *fdesc = fchan->fdesc; | |
566 | size_t residue = 0; | |
567 | dma_addr_t cur_addr = 0; | |
568 | int i; | |
569 | ||
570 | if (in_progress) { | |
571 | cur_addr = fchan_read(fchan, FDMA_CH_CMD_OFST); | |
572 | cur_addr &= FDMA_CH_CMD_DATA_MASK; | |
573 | } | |
574 | ||
575 | for (i = fchan->fdesc->n_nodes - 1 ; i >= 0; i--) { | |
576 | if (cur_addr == fdesc->node[i].pdesc) { | |
577 | residue += fnode_read(fchan, FDMA_CNTN_OFST); | |
578 | break; | |
579 | } | |
580 | residue += fdesc->node[i].desc->nbytes; | |
581 | } | |
582 | ||
583 | return residue; | |
584 | } | |
585 | ||
586 | static enum dma_status st_fdma_tx_status(struct dma_chan *chan, | |
587 | dma_cookie_t cookie, | |
588 | struct dma_tx_state *txstate) | |
589 | { | |
590 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
591 | struct virt_dma_desc *vd; | |
592 | enum dma_status ret; | |
593 | unsigned long flags; | |
594 | ||
595 | ret = dma_cookie_status(chan, cookie, txstate); | |
596 | if (ret == DMA_COMPLETE || !txstate) | |
597 | return ret; | |
598 | ||
599 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
600 | vd = vchan_find_desc(&fchan->vchan, cookie); | |
601 | if (fchan->fdesc && cookie == fchan->fdesc->vdesc.tx.cookie) | |
602 | txstate->residue = st_fdma_desc_residue(fchan, vd, true); | |
603 | else if (vd) | |
604 | txstate->residue = st_fdma_desc_residue(fchan, vd, false); | |
605 | else | |
606 | txstate->residue = 0; | |
607 | ||
608 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
613 | static void st_fdma_issue_pending(struct dma_chan *chan) | |
614 | { | |
615 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
616 | unsigned long flags; | |
617 | ||
618 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
619 | ||
620 | if (vchan_issue_pending(&fchan->vchan) && !fchan->fdesc) | |
621 | st_fdma_xfer_desc(fchan); | |
622 | ||
623 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
624 | } | |
625 | ||
626 | static int st_fdma_pause(struct dma_chan *chan) | |
627 | { | |
628 | unsigned long flags; | |
629 | LIST_HEAD(head); | |
630 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
631 | int ch_id = fchan->vchan.chan.chan_id; | |
632 | unsigned long cmd = FDMA_CMD_PAUSE(ch_id); | |
633 | ||
634 | dev_dbg(fchan->fdev->dev, "pause chan:%d\n", ch_id); | |
635 | ||
636 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
637 | if (fchan->fdesc) | |
638 | fdma_write(fchan->fdev, cmd, FDMA_CMD_SET_OFST); | |
639 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static int st_fdma_resume(struct dma_chan *chan) | |
645 | { | |
646 | unsigned long flags; | |
647 | unsigned long val; | |
648 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
649 | int ch_id = fchan->vchan.chan.chan_id; | |
650 | ||
651 | dev_dbg(fchan->fdev->dev, "resume chan:%d\n", ch_id); | |
652 | ||
653 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
654 | if (fchan->fdesc) { | |
655 | val = fchan_read(fchan, FDMA_CH_CMD_OFST); | |
656 | val &= FDMA_CH_CMD_DATA_MASK; | |
657 | fchan_write(fchan, val, FDMA_CH_CMD_OFST); | |
658 | } | |
659 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | static int st_fdma_terminate_all(struct dma_chan *chan) | |
665 | { | |
666 | unsigned long flags; | |
667 | LIST_HEAD(head); | |
668 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
669 | int ch_id = fchan->vchan.chan.chan_id; | |
670 | unsigned long cmd = FDMA_CMD_PAUSE(ch_id); | |
671 | ||
672 | dev_dbg(fchan->fdev->dev, "terminate chan:%d\n", ch_id); | |
673 | ||
674 | spin_lock_irqsave(&fchan->vchan.lock, flags); | |
675 | fdma_write(fchan->fdev, cmd, FDMA_CMD_SET_OFST); | |
676 | fchan->fdesc = NULL; | |
677 | vchan_get_all_descriptors(&fchan->vchan, &head); | |
678 | spin_unlock_irqrestore(&fchan->vchan.lock, flags); | |
679 | vchan_dma_desc_free_list(&fchan->vchan, &head); | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int st_fdma_slave_config(struct dma_chan *chan, | |
685 | struct dma_slave_config *slave_cfg) | |
686 | { | |
687 | struct st_fdma_chan *fchan = to_st_fdma_chan(chan); | |
688 | ||
689 | memcpy(&fchan->scfg, slave_cfg, sizeof(fchan->scfg)); | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static const struct st_fdma_driverdata fdma_mpe31_stih407_11 = { | |
694 | .name = "STiH407", | |
695 | .id = 0, | |
696 | }; | |
697 | ||
698 | static const struct st_fdma_driverdata fdma_mpe31_stih407_12 = { | |
699 | .name = "STiH407", | |
700 | .id = 1, | |
701 | }; | |
702 | ||
703 | static const struct st_fdma_driverdata fdma_mpe31_stih407_13 = { | |
704 | .name = "STiH407", | |
705 | .id = 2, | |
706 | }; | |
707 | ||
708 | static const struct of_device_id st_fdma_match[] = { | |
709 | { .compatible = "st,stih407-fdma-mpe31-11" | |
710 | , .data = &fdma_mpe31_stih407_11 }, | |
711 | { .compatible = "st,stih407-fdma-mpe31-12" | |
712 | , .data = &fdma_mpe31_stih407_12 }, | |
713 | { .compatible = "st,stih407-fdma-mpe31-13" | |
714 | , .data = &fdma_mpe31_stih407_13 }, | |
715 | {}, | |
716 | }; | |
717 | MODULE_DEVICE_TABLE(of, st_fdma_match); | |
718 | ||
719 | static int st_fdma_parse_dt(struct platform_device *pdev, | |
720 | const struct st_fdma_driverdata *drvdata, | |
721 | struct st_fdma_dev *fdev) | |
722 | { | |
6b4cd727 PG |
723 | snprintf(fdev->fw_name, FW_NAME_SIZE, "fdma_%s_%d.elf", |
724 | drvdata->name, drvdata->id); | |
725 | ||
919b742f AB |
726 | return of_property_read_u32(pdev->dev.of_node, "dma-channels", |
727 | &fdev->nr_channels); | |
6b4cd727 PG |
728 | } |
729 | #define FDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ | |
730 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ | |
731 | BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ | |
732 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) | |
733 | ||
734 | static void st_fdma_free(struct st_fdma_dev *fdev) | |
735 | { | |
736 | struct st_fdma_chan *fchan; | |
737 | int i; | |
738 | ||
739 | for (i = 0; i < fdev->nr_channels; i++) { | |
740 | fchan = &fdev->chans[i]; | |
741 | list_del(&fchan->vchan.chan.device_node); | |
742 | tasklet_kill(&fchan->vchan.task); | |
743 | } | |
744 | } | |
745 | ||
746 | static int st_fdma_probe(struct platform_device *pdev) | |
747 | { | |
748 | struct st_fdma_dev *fdev; | |
749 | const struct of_device_id *match; | |
750 | struct device_node *np = pdev->dev.of_node; | |
751 | const struct st_fdma_driverdata *drvdata; | |
752 | int ret, i; | |
753 | ||
754 | match = of_match_device((st_fdma_match), &pdev->dev); | |
755 | if (!match || !match->data) { | |
756 | dev_err(&pdev->dev, "No device match found\n"); | |
757 | return -ENODEV; | |
758 | } | |
759 | ||
760 | drvdata = match->data; | |
761 | ||
762 | fdev = devm_kzalloc(&pdev->dev, sizeof(*fdev), GFP_KERNEL); | |
763 | if (!fdev) | |
764 | return -ENOMEM; | |
765 | ||
766 | ret = st_fdma_parse_dt(pdev, drvdata, fdev); | |
767 | if (ret) { | |
768 | dev_err(&pdev->dev, "unable to find platform data\n"); | |
769 | goto err; | |
770 | } | |
771 | ||
772 | fdev->chans = devm_kcalloc(&pdev->dev, fdev->nr_channels, | |
773 | sizeof(struct st_fdma_chan), GFP_KERNEL); | |
774 | if (!fdev->chans) | |
775 | return -ENOMEM; | |
776 | ||
777 | fdev->dev = &pdev->dev; | |
778 | fdev->drvdata = drvdata; | |
779 | platform_set_drvdata(pdev, fdev); | |
780 | ||
781 | fdev->irq = platform_get_irq(pdev, 0); | |
782 | if (fdev->irq < 0) { | |
783 | dev_err(&pdev->dev, "Failed to get irq resource\n"); | |
784 | return -EINVAL; | |
785 | } | |
786 | ||
787 | ret = devm_request_irq(&pdev->dev, fdev->irq, st_fdma_irq_handler, 0, | |
788 | dev_name(&pdev->dev), fdev); | |
789 | if (ret) { | |
790 | dev_err(&pdev->dev, "Failed to request irq (%d)\n", ret); | |
791 | goto err; | |
792 | } | |
793 | ||
794 | fdev->slim_rproc = st_slim_rproc_alloc(pdev, fdev->fw_name); | |
e687cd19 | 795 | if (IS_ERR(fdev->slim_rproc)) { |
6b4cd727 PG |
796 | ret = PTR_ERR(fdev->slim_rproc); |
797 | dev_err(&pdev->dev, "slim_rproc_alloc failed (%d)\n", ret); | |
798 | goto err; | |
799 | } | |
800 | ||
801 | /* Initialise list of FDMA channels */ | |
802 | INIT_LIST_HEAD(&fdev->dma_device.channels); | |
803 | for (i = 0; i < fdev->nr_channels; i++) { | |
804 | struct st_fdma_chan *fchan = &fdev->chans[i]; | |
805 | ||
806 | fchan->fdev = fdev; | |
807 | fchan->vchan.desc_free = st_fdma_free_desc; | |
808 | vchan_init(&fchan->vchan, &fdev->dma_device); | |
809 | } | |
810 | ||
811 | /* Initialise the FDMA dreq (reserve 0 & 31 for FDMA use) */ | |
812 | fdev->dreq_mask = BIT(0) | BIT(31); | |
813 | ||
814 | dma_cap_set(DMA_SLAVE, fdev->dma_device.cap_mask); | |
815 | dma_cap_set(DMA_CYCLIC, fdev->dma_device.cap_mask); | |
816 | dma_cap_set(DMA_MEMCPY, fdev->dma_device.cap_mask); | |
817 | ||
818 | fdev->dma_device.dev = &pdev->dev; | |
819 | fdev->dma_device.device_alloc_chan_resources = st_fdma_alloc_chan_res; | |
820 | fdev->dma_device.device_free_chan_resources = st_fdma_free_chan_res; | |
821 | fdev->dma_device.device_prep_dma_cyclic = st_fdma_prep_dma_cyclic; | |
822 | fdev->dma_device.device_prep_slave_sg = st_fdma_prep_slave_sg; | |
823 | fdev->dma_device.device_prep_dma_memcpy = st_fdma_prep_dma_memcpy; | |
824 | fdev->dma_device.device_tx_status = st_fdma_tx_status; | |
825 | fdev->dma_device.device_issue_pending = st_fdma_issue_pending; | |
826 | fdev->dma_device.device_terminate_all = st_fdma_terminate_all; | |
827 | fdev->dma_device.device_config = st_fdma_slave_config; | |
828 | fdev->dma_device.device_pause = st_fdma_pause; | |
829 | fdev->dma_device.device_resume = st_fdma_resume; | |
830 | ||
831 | fdev->dma_device.src_addr_widths = FDMA_DMA_BUSWIDTHS; | |
832 | fdev->dma_device.dst_addr_widths = FDMA_DMA_BUSWIDTHS; | |
833 | fdev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
834 | fdev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; | |
835 | ||
836 | ret = dma_async_device_register(&fdev->dma_device); | |
837 | if (ret) { | |
838 | dev_err(&pdev->dev, | |
839 | "Failed to register DMA device (%d)\n", ret); | |
840 | goto err_rproc; | |
841 | } | |
842 | ||
843 | ret = of_dma_controller_register(np, st_fdma_of_xlate, fdev); | |
844 | if (ret) { | |
845 | dev_err(&pdev->dev, | |
846 | "Failed to register controller (%d)\n", ret); | |
847 | goto err_dma_dev; | |
848 | } | |
849 | ||
850 | dev_info(&pdev->dev, "ST FDMA engine driver, irq:%d\n", fdev->irq); | |
851 | ||
852 | return 0; | |
853 | ||
854 | err_dma_dev: | |
855 | dma_async_device_unregister(&fdev->dma_device); | |
856 | err_rproc: | |
857 | st_fdma_free(fdev); | |
858 | st_slim_rproc_put(fdev->slim_rproc); | |
859 | err: | |
860 | return ret; | |
861 | } | |
862 | ||
863 | static int st_fdma_remove(struct platform_device *pdev) | |
864 | { | |
865 | struct st_fdma_dev *fdev = platform_get_drvdata(pdev); | |
866 | ||
867 | devm_free_irq(&pdev->dev, fdev->irq, fdev); | |
868 | st_slim_rproc_put(fdev->slim_rproc); | |
869 | of_dma_controller_free(pdev->dev.of_node); | |
870 | dma_async_device_unregister(&fdev->dma_device); | |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
875 | static struct platform_driver st_fdma_platform_driver = { | |
876 | .driver = { | |
877 | .name = DRIVER_NAME, | |
878 | .of_match_table = st_fdma_match, | |
879 | }, | |
880 | .probe = st_fdma_probe, | |
881 | .remove = st_fdma_remove, | |
882 | }; | |
883 | module_platform_driver(st_fdma_platform_driver); | |
884 | ||
885 | MODULE_LICENSE("GPL v2"); | |
886 | MODULE_DESCRIPTION("STMicroelectronics FDMA engine driver"); | |
887 | MODULE_AUTHOR("Ludovic.barre <Ludovic.barre@st.com>"); | |
888 | MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>"); | |
889 | MODULE_ALIAS("platform: " DRIVER_NAME); |