1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/dma/fsl-edma.c
4 *
5 * Copyright 2013-2014 Freescale Semiconductor, Inc.
6 * Copyright 2024 NXP
7 *
8 * Driver for the Freescale eDMA engine with flexible channel multiplexing
9 * capability for DMA request sources. The eDMA block can be found on some
10 * Vybrid, Layerscape and S32G SoCs.
11 */
12
13 #include <dt-bindings/dma/fsl-edma.h>
14 #include <linux/bitfield.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/clk.h>
18 #include <linux/of.h>
19 #include <linux/of_dma.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/pm_domain.h>
23 #include <linux/property.h>
24
25 #include "fsl-edma-common.h"
26
fsl_edma_synchronize(struct dma_chan * chan)27 static void fsl_edma_synchronize(struct dma_chan *chan)
28 {
29 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
30
31 vchan_synchronize(&fsl_chan->vchan);
32 }
33
fsl_edma_tx_handler(int irq,void * dev_id)34 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
35 {
36 struct fsl_edma_engine *fsl_edma = dev_id;
37 unsigned int intr, ch;
38 struct edma_regs *regs = &fsl_edma->regs;
39
40 intr = edma_readl(fsl_edma, regs->intl);
41 if (!intr)
42 return IRQ_NONE;
43
44 for (ch = 0; ch < fsl_edma->n_chans; ch++) {
45 if (intr & (0x1 << ch)) {
46 edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
47 fsl_edma_tx_chan_handler(&fsl_edma->chans[ch]);
48 }
49 }
50 return IRQ_HANDLED;
51 }
52
fsl_edma3_tx_handler(int irq,void * dev_id)53 static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id)
54 {
55 struct fsl_edma_chan *fsl_chan = dev_id;
56 unsigned int intr;
57
58 intr = edma_readl_chreg(fsl_chan, ch_int);
59 if (!intr)
60 return IRQ_HANDLED;
61
62 edma_writel_chreg(fsl_chan, 1, ch_int);
63
64 fsl_edma_tx_chan_handler(fsl_chan);
65
66 return IRQ_HANDLED;
67 }
68
fsl_edma2_tx_handler(int irq,void * devi_id)69 static irqreturn_t fsl_edma2_tx_handler(int irq, void *devi_id)
70 {
71 struct fsl_edma_chan *fsl_chan = devi_id;
72
73 return fsl_edma_tx_handler(irq, fsl_chan->edma);
74 }
75
fsl_edma3_or_tx_handler(int irq,void * dev_id,u8 start,u8 end)76 static irqreturn_t fsl_edma3_or_tx_handler(int irq, void *dev_id,
77 u8 start, u8 end)
78 {
79 struct fsl_edma_engine *fsl_edma = dev_id;
80 struct fsl_edma_chan *chan;
81 int i;
82
83 end = min(end, fsl_edma->n_chans);
84
85 for (i = start; i < end; i++) {
86 chan = &fsl_edma->chans[i];
87
88 fsl_edma3_tx_handler(irq, chan);
89 }
90
91 return IRQ_HANDLED;
92 }
93
fsl_edma3_tx_0_15_handler(int irq,void * dev_id)94 static irqreturn_t fsl_edma3_tx_0_15_handler(int irq, void *dev_id)
95 {
96 return fsl_edma3_or_tx_handler(irq, dev_id, 0, 16);
97 }
98
fsl_edma3_tx_16_31_handler(int irq,void * dev_id)99 static irqreturn_t fsl_edma3_tx_16_31_handler(int irq, void *dev_id)
100 {
101 return fsl_edma3_or_tx_handler(irq, dev_id, 16, 32);
102 }
103
fsl_edma3_or_err_handler(int irq,void * dev_id)104 static irqreturn_t fsl_edma3_or_err_handler(int irq, void *dev_id)
105 {
106 struct fsl_edma_engine *fsl_edma = dev_id;
107 struct edma_regs *regs = &fsl_edma->regs;
108 unsigned int err, ch, ch_es;
109 struct fsl_edma_chan *chan;
110
111 err = edma_readl(fsl_edma, regs->es);
112 if (!(err & EDMA_V3_MP_ES_VLD))
113 return IRQ_NONE;
114
115 for (ch = 0; ch < fsl_edma->n_chans; ch++) {
116 chan = &fsl_edma->chans[ch];
117
118 ch_es = edma_readl_chreg(chan, ch_es);
119 if (!(ch_es & EDMA_V3_CH_ES_ERR))
120 continue;
121
122 edma_writel_chreg(chan, EDMA_V3_CH_ES_ERR, ch_es);
123 fsl_edma_disable_request(chan);
124 fsl_edma->chans[ch].status = DMA_ERROR;
125 }
126
127 return IRQ_HANDLED;
128 }
129
fsl_edma_err_handler(int irq,void * dev_id)130 static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
131 {
132 struct fsl_edma_engine *fsl_edma = dev_id;
133 unsigned int err, ch;
134 struct edma_regs *regs = &fsl_edma->regs;
135
136 err = edma_readl(fsl_edma, regs->errl);
137 if (!err)
138 return IRQ_NONE;
139
140 for (ch = 0; ch < fsl_edma->n_chans; ch++) {
141 if (err & (0x1 << ch)) {
142 fsl_edma_disable_request(&fsl_edma->chans[ch]);
143 edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
144 fsl_edma_err_chan_handler(&fsl_edma->chans[ch]);
145 }
146 }
147 return IRQ_HANDLED;
148 }
149
fsl_edma_irq_handler(int irq,void * dev_id)150 static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
151 {
152 if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
153 return IRQ_HANDLED;
154
155 return fsl_edma_err_handler(irq, dev_id);
156 }
157
fsl_edma_srcid_in_use(struct fsl_edma_engine * fsl_edma,u32 srcid)158 static bool fsl_edma_srcid_in_use(struct fsl_edma_engine *fsl_edma, u32 srcid)
159 {
160 struct fsl_edma_chan *fsl_chan;
161 int i;
162
163 for (i = 0; i < fsl_edma->n_chans; i++) {
164 fsl_chan = &fsl_edma->chans[i];
165
166 if (fsl_chan->srcid && srcid == fsl_chan->srcid) {
167 dev_err(&fsl_chan->pdev->dev, "The srcid is in use, can't use!");
168 return true;
169 }
170 }
171 return false;
172 }
173
fsl_edma_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)174 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
175 struct of_dma *ofdma)
176 {
177 struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
178 struct dma_chan *chan, *_chan;
179 struct fsl_edma_chan *fsl_chan;
180 u32 dmamux_nr = fsl_edma->drvdata->dmamuxs;
181 unsigned long chans_per_mux = fsl_edma->n_chans / dmamux_nr;
182
183 if (dma_spec->args_count != 2)
184 return NULL;
185
186 guard(mutex)(&fsl_edma->fsl_edma_mutex);
187
188 list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
189 if (chan->client_count)
190 continue;
191
192 if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[1]))
193 return NULL;
194
195 if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
196 chan = dma_get_slave_channel(chan);
197 if (chan) {
198 chan->device->privatecnt++;
199 fsl_chan = to_fsl_edma_chan(chan);
200 fsl_chan->srcid = dma_spec->args[1];
201
202 if (!fsl_chan->srcid) {
203 dev_err(&fsl_chan->pdev->dev, "Invalidate srcid %d\n",
204 fsl_chan->srcid);
205 return NULL;
206 }
207
208 fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid,
209 true);
210 return chan;
211 }
212 }
213 }
214 return NULL;
215 }
216
fsl_edma3_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)217 static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
218 struct of_dma *ofdma)
219 {
220 struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
221 struct dma_chan *chan, *_chan;
222 struct fsl_edma_chan *fsl_chan;
223 bool b_chmux;
224 int i;
225
226 if (dma_spec->args_count != 3)
227 return NULL;
228
229 b_chmux = !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX);
230
231 guard(mutex)(&fsl_edma->fsl_edma_mutex);
232 list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels,
233 device_node) {
234
235 if (chan->client_count)
236 continue;
237
238 fsl_chan = to_fsl_edma_chan(chan);
239 if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[0]))
240 return NULL;
241 i = fsl_chan - fsl_edma->chans;
242
243 fsl_chan->priority = dma_spec->args[1];
244 fsl_chan->is_rxchan = dma_spec->args[2] & FSL_EDMA_RX;
245 fsl_chan->is_remote = dma_spec->args[2] & FSL_EDMA_REMOTE;
246 fsl_chan->is_multi_fifo = dma_spec->args[2] & FSL_EDMA_MULTI_FIFO;
247
248 if ((dma_spec->args[2] & FSL_EDMA_EVEN_CH) && (i & 0x1))
249 continue;
250
251 if ((dma_spec->args[2] & FSL_EDMA_ODD_CH) && !(i & 0x1))
252 continue;
253
254 if (!b_chmux && i == dma_spec->args[0]) {
255 chan = dma_get_slave_channel(chan);
256 chan->device->privatecnt++;
257 return chan;
258 } else if (b_chmux && !fsl_chan->srcid) {
259 /* if controller support channel mux, choose a free channel */
260 chan = dma_get_slave_channel(chan);
261 chan->device->privatecnt++;
262 fsl_chan->srcid = dma_spec->args[0];
263 return chan;
264 }
265 }
266 return NULL;
267 }
268
269 static int
fsl_edma_irq_init(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)270 fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
271 {
272 int ret;
273
274 edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
275
276 fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
277 if (fsl_edma->txirq < 0)
278 return fsl_edma->txirq;
279
280 fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
281 if (fsl_edma->errirq < 0)
282 return fsl_edma->errirq;
283
284 if (fsl_edma->txirq == fsl_edma->errirq) {
285 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
286 fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
287 if (ret) {
288 dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
289 return ret;
290 }
291 } else {
292 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
293 fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
294 if (ret) {
295 dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
296 return ret;
297 }
298
299 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
300 fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
301 if (ret) {
302 dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
303 return ret;
304 }
305 }
306
307 return 0;
308 }
309
fsl_edma3_irq_init(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)310 static int fsl_edma3_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
311 {
312 int i;
313
314 for (i = 0; i < fsl_edma->n_chans; i++) {
315
316 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
317
318 if (fsl_edma->chan_masked & BIT(i))
319 continue;
320
321 /* request channel irq */
322 fsl_chan->txirq = platform_get_irq(pdev, i);
323 if (fsl_chan->txirq < 0)
324 return -EINVAL;
325
326 fsl_chan->irq_handler = fsl_edma3_tx_handler;
327 }
328
329 return 0;
330 }
331
fsl_edma3_or_irq_init(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)332 static int fsl_edma3_or_irq_init(struct platform_device *pdev,
333 struct fsl_edma_engine *fsl_edma)
334 {
335 int ret;
336
337 fsl_edma->txirq = platform_get_irq_byname(pdev, "tx-0-15");
338 if (fsl_edma->txirq < 0)
339 return fsl_edma->txirq;
340
341 fsl_edma->txirq_16_31 = platform_get_irq_byname(pdev, "tx-16-31");
342 if (fsl_edma->txirq_16_31 < 0)
343 return fsl_edma->txirq_16_31;
344
345 fsl_edma->errirq = platform_get_irq_byname(pdev, "err");
346 if (fsl_edma->errirq < 0)
347 return fsl_edma->errirq;
348
349 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
350 fsl_edma3_tx_0_15_handler, 0, "eDMA tx0_15",
351 fsl_edma);
352 if (ret)
353 return dev_err_probe(&pdev->dev, ret,
354 "Can't register eDMA tx0_15 IRQ.\n");
355
356 if (fsl_edma->n_chans > 16) {
357 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq_16_31,
358 fsl_edma3_tx_16_31_handler, 0,
359 "eDMA tx16_31", fsl_edma);
360 if (ret)
361 return dev_err_probe(&pdev->dev, ret,
362 "Can't register eDMA tx16_31 IRQ.\n");
363 }
364
365 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
366 fsl_edma3_or_err_handler, 0, "eDMA err",
367 fsl_edma);
368 if (ret)
369 return dev_err_probe(&pdev->dev, ret,
370 "Can't register eDMA err IRQ.\n");
371
372 return 0;
373 }
374
375 static int
fsl_edma2_irq_init(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)376 fsl_edma2_irq_init(struct platform_device *pdev,
377 struct fsl_edma_engine *fsl_edma)
378 {
379 int i, ret, irq;
380 int count;
381
382 edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
383
384 count = platform_irq_count(pdev);
385 dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
386 if (count <= 2) {
387 dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
388 return -EINVAL;
389 }
390 /*
391 * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
392 * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
393 * For now, just simply request irq without IRQF_SHARED flag, since 16
394 * channels are enough on i.mx7ulp whose M4 domain own some peripherals.
395 */
396 for (i = 0; i < count; i++) {
397 irq = platform_get_irq(pdev, i);
398 ret = 0;
399 if (irq < 0)
400 return -ENXIO;
401
402 /* The last IRQ is for eDMA err */
403 if (i == count - 1) {
404 ret = devm_request_irq(&pdev->dev, irq,
405 fsl_edma_err_handler,
406 0, "eDMA2-ERR", fsl_edma);
407 } else {
408 fsl_edma->chans[i].txirq = irq;
409 fsl_edma->chans[i].irq_handler = fsl_edma2_tx_handler;
410 }
411
412 if (ret)
413 return ret;
414 }
415
416 return 0;
417 }
418
fsl_edma_irq_exit(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)419 static void fsl_edma_irq_exit(
420 struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
421 {
422 if (fsl_edma->txirq == fsl_edma->errirq) {
423 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
424 } else {
425 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
426 devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma);
427 }
428 }
429
fsl_disable_clocks(struct fsl_edma_engine * fsl_edma,int nr_clocks)430 static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
431 {
432 int i;
433
434 for (i = 0; i < nr_clocks; i++)
435 clk_disable_unprepare(fsl_edma->muxclk[i]);
436 }
437
438 static struct fsl_edma_drvdata vf610_data = {
439 .dmamuxs = DMAMUX_NR,
440 .flags = FSL_EDMA_DRV_WRAP_IO,
441 .chreg_off = EDMA_TCD,
442 .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
443 .setup_irq = fsl_edma_irq_init,
444 };
445
446 static struct fsl_edma_drvdata ls1028a_data = {
447 .dmamuxs = DMAMUX_NR,
448 .flags = FSL_EDMA_DRV_MUX_SWAP | FSL_EDMA_DRV_WRAP_IO,
449 .chreg_off = EDMA_TCD,
450 .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
451 .setup_irq = fsl_edma_irq_init,
452 };
453
454 static struct fsl_edma_drvdata imx7ulp_data = {
455 .dmamuxs = 1,
456 .chreg_off = EDMA_TCD,
457 .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
458 .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32,
459 .setup_irq = fsl_edma2_irq_init,
460 };
461
462 static struct fsl_edma_drvdata imx8qm_data = {
463 .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3 | FSL_EDMA_DRV_MEM_REMOTE,
464 .chreg_space_sz = 0x10000,
465 .chreg_off = 0x10000,
466 .setup_irq = fsl_edma3_irq_init,
467 };
468
469 static struct fsl_edma_drvdata imx8ulp_data = {
470 .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_CHCLK | FSL_EDMA_DRV_HAS_DMACLK |
471 FSL_EDMA_DRV_EDMA3,
472 .chreg_space_sz = 0x10000,
473 .chreg_off = 0x10000,
474 .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux),
475 .mux_skip = 0x10000,
476 .setup_irq = fsl_edma3_irq_init,
477 };
478
479 static struct fsl_edma_drvdata imx93_data3 = {
480 .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3,
481 .chreg_space_sz = 0x10000,
482 .chreg_off = 0x10000,
483 .setup_irq = fsl_edma3_irq_init,
484 };
485
486 static struct fsl_edma_drvdata imx93_data4 = {
487 .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4,
488 .chreg_space_sz = 0x8000,
489 .chreg_off = 0x10000,
490 .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux),
491 .mux_skip = 0x8000,
492 .setup_irq = fsl_edma3_irq_init,
493 };
494
495 static struct fsl_edma_drvdata imx95_data5 = {
496 .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4 |
497 FSL_EDMA_DRV_TCD64,
498 .chreg_space_sz = 0x8000,
499 .chreg_off = 0x10000,
500 .mux_off = 0x200,
501 .mux_skip = sizeof(u32),
502 .setup_irq = fsl_edma3_irq_init,
503 };
504
505 static const struct fsl_edma_drvdata s32g2_data = {
506 .dmamuxs = DMAMUX_NR,
507 .chreg_space_sz = EDMA_TCD,
508 .chreg_off = 0x4000,
509 .flags = FSL_EDMA_DRV_EDMA3 | FSL_EDMA_DRV_MUX_SWAP,
510 .setup_irq = fsl_edma3_or_irq_init,
511 };
512
513 static const struct of_device_id fsl_edma_dt_ids[] = {
514 { .compatible = "fsl,vf610-edma", .data = &vf610_data},
515 { .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
516 { .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
517 { .compatible = "fsl,imx8qm-edma", .data = &imx8qm_data},
518 { .compatible = "fsl,imx8ulp-edma", .data = &imx8ulp_data},
519 { .compatible = "fsl,imx93-edma3", .data = &imx93_data3},
520 { .compatible = "fsl,imx93-edma4", .data = &imx93_data4},
521 { .compatible = "fsl,imx95-edma5", .data = &imx95_data5},
522 { .compatible = "nxp,s32g2-edma", .data = &s32g2_data},
523 { /* sentinel */ }
524 };
525 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
526
fsl_edma3_detach_pd(struct fsl_edma_engine * fsl_edma)527 static void fsl_edma3_detach_pd(struct fsl_edma_engine *fsl_edma)
528 {
529 struct fsl_edma_chan *fsl_chan;
530 int i;
531
532 for (i = 0; i < fsl_edma->n_chans; i++) {
533 if (fsl_edma->chan_masked & BIT(i))
534 continue;
535 fsl_chan = &fsl_edma->chans[i];
536 if (fsl_chan->pd_dev_link)
537 device_link_del(fsl_chan->pd_dev_link);
538 if (fsl_chan->pd_dev) {
539 dev_pm_domain_detach(fsl_chan->pd_dev, false);
540 pm_runtime_dont_use_autosuspend(fsl_chan->pd_dev);
541 pm_runtime_set_suspended(fsl_chan->pd_dev);
542 }
543 }
544 }
545
devm_fsl_edma3_detach_pd(void * data)546 static void devm_fsl_edma3_detach_pd(void *data)
547 {
548 fsl_edma3_detach_pd(data);
549 }
550
fsl_edma3_attach_pd(struct platform_device * pdev,struct fsl_edma_engine * fsl_edma)551 static int fsl_edma3_attach_pd(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
552 {
553 struct fsl_edma_chan *fsl_chan;
554 struct device *pd_chan;
555 struct device *dev;
556 int i;
557
558 dev = &pdev->dev;
559
560 for (i = 0; i < fsl_edma->n_chans; i++) {
561 if (fsl_edma->chan_masked & BIT(i))
562 continue;
563
564 fsl_chan = &fsl_edma->chans[i];
565
566 pd_chan = dev_pm_domain_attach_by_id(dev, i);
567 if (IS_ERR_OR_NULL(pd_chan)) {
568 dev_err(dev, "Failed attach pd %d\n", i);
569 goto detach;
570 }
571
572 fsl_chan->pd_dev_link = device_link_add(dev, pd_chan, DL_FLAG_STATELESS |
573 DL_FLAG_PM_RUNTIME |
574 DL_FLAG_RPM_ACTIVE);
575 if (!fsl_chan->pd_dev_link) {
576 dev_err(dev, "Failed to add device_link to %d\n", i);
577 dev_pm_domain_detach(pd_chan, false);
578 goto detach;
579 }
580
581 fsl_chan->pd_dev = pd_chan;
582
583 pm_runtime_use_autosuspend(fsl_chan->pd_dev);
584 pm_runtime_set_autosuspend_delay(fsl_chan->pd_dev, 200);
585 pm_runtime_set_active(fsl_chan->pd_dev);
586 }
587
588 return 0;
589
590 detach:
591 fsl_edma3_detach_pd(fsl_edma);
592 return -EINVAL;
593 }
594
fsl_edma_probe(struct platform_device * pdev)595 static int fsl_edma_probe(struct platform_device *pdev)
596 {
597 struct device_node *np = pdev->dev.of_node;
598 struct fsl_edma_engine *fsl_edma;
599 const struct fsl_edma_drvdata *drvdata = NULL;
600 u32 chan_mask[2] = {0, 0};
601 char clk_name[36];
602 struct edma_regs *regs;
603 int chans;
604 int ret, i;
605
606 drvdata = device_get_match_data(&pdev->dev);
607 if (!drvdata) {
608 dev_err(&pdev->dev, "unable to find driver data\n");
609 return -EINVAL;
610 }
611
612 ret = of_property_read_u32(np, "dma-channels", &chans);
613 if (ret) {
614 dev_err(&pdev->dev, "Can't get dma-channels.\n");
615 return ret;
616 }
617
618 fsl_edma = devm_kzalloc(&pdev->dev, struct_size(fsl_edma, chans, chans),
619 GFP_KERNEL);
620 if (!fsl_edma)
621 return -ENOMEM;
622
623 fsl_edma->drvdata = drvdata;
624 fsl_edma->n_chans = chans;
625 mutex_init(&fsl_edma->fsl_edma_mutex);
626
627 fsl_edma->membase = devm_platform_ioremap_resource(pdev, 0);
628 if (IS_ERR(fsl_edma->membase))
629 return PTR_ERR(fsl_edma->membase);
630
631 if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) {
632 fsl_edma_setup_regs(fsl_edma);
633 regs = &fsl_edma->regs;
634 }
635
636 if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
637 fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
638 if (IS_ERR(fsl_edma->dmaclk)) {
639 dev_err(&pdev->dev, "Missing DMA block clock.\n");
640 return PTR_ERR(fsl_edma->dmaclk);
641 }
642 }
643
644 ret = of_property_read_variable_u32_array(np, "dma-channel-mask", chan_mask, 1, 2);
645
646 if (ret > 0) {
647 fsl_edma->chan_masked = chan_mask[1];
648 fsl_edma->chan_masked <<= 32;
649 fsl_edma->chan_masked |= chan_mask[0];
650 }
651
652 for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
653 char clkname[32];
654
655 fsl_edma->muxbase[i] = devm_platform_ioremap_resource(pdev,
656 1 + i);
657 if (IS_ERR(fsl_edma->muxbase[i])) {
658 /* on error: disable all previously enabled clks */
659 fsl_disable_clocks(fsl_edma, i);
660 return PTR_ERR(fsl_edma->muxbase[i]);
661 }
662
663 sprintf(clkname, "dmamux%d", i);
664 fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname);
665 if (IS_ERR(fsl_edma->muxclk[i])) {
666 dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
667 /* on error: disable all previously enabled clks */
668 return PTR_ERR(fsl_edma->muxclk[i]);
669 }
670 }
671
672 fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
673
674 if (drvdata->flags & FSL_EDMA_DRV_HAS_PD) {
675 ret = fsl_edma3_attach_pd(pdev, fsl_edma);
676 if (ret)
677 return ret;
678 ret = devm_add_action_or_reset(&pdev->dev, devm_fsl_edma3_detach_pd, fsl_edma);
679 if (ret)
680 return ret;
681 }
682
683 if (drvdata->flags & FSL_EDMA_DRV_TCD64)
684 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
685
686 INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
687 for (i = 0; i < fsl_edma->n_chans; i++) {
688 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
689 int len;
690
691 if (fsl_edma->chan_masked & BIT(i))
692 continue;
693
694 snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d",
695 dev_name(&pdev->dev), i);
696
697 fsl_chan->edma = fsl_edma;
698 fsl_chan->pm_state = RUNNING;
699 fsl_chan->srcid = 0;
700 fsl_chan->dma_dir = DMA_NONE;
701 fsl_chan->vchan.desc_free = fsl_edma_free_desc;
702
703 len = (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) ?
704 offsetof(struct fsl_edma3_ch_reg, tcd) : 0;
705 fsl_chan->tcd = fsl_edma->membase
706 + i * drvdata->chreg_space_sz + drvdata->chreg_off + len;
707 fsl_chan->mux_addr = fsl_edma->membase + drvdata->mux_off + i * drvdata->mux_skip;
708
709 if (drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) {
710 snprintf(clk_name, sizeof(clk_name), "ch%02d", i);
711 fsl_chan->clk = devm_clk_get_enabled(&pdev->dev,
712 (const char *)clk_name);
713
714 if (IS_ERR(fsl_chan->clk))
715 return PTR_ERR(fsl_chan->clk);
716 }
717 fsl_chan->pdev = pdev;
718 vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
719
720 edma_write_tcdreg(fsl_chan, cpu_to_le32(0), csr);
721 fsl_edma_chan_mux(fsl_chan, 0, false);
722 if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK)
723 clk_disable_unprepare(fsl_chan->clk);
724 }
725
726 ret = fsl_edma->drvdata->setup_irq(pdev, fsl_edma);
727 if (ret)
728 return ret;
729
730 dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
731 dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
732 dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
733 dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask);
734
735 fsl_edma->dma_dev.dev = &pdev->dev;
736 fsl_edma->dma_dev.device_alloc_chan_resources
737 = fsl_edma_alloc_chan_resources;
738 fsl_edma->dma_dev.device_free_chan_resources
739 = fsl_edma_free_chan_resources;
740 fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
741 fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
742 fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
743 fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy;
744 fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
745 fsl_edma->dma_dev.device_pause = fsl_edma_pause;
746 fsl_edma->dma_dev.device_resume = fsl_edma_resume;
747 fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
748 fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize;
749 fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
750
751 fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
752 fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
753
754 if (drvdata->flags & FSL_EDMA_DRV_BUS_8BYTE) {
755 fsl_edma->dma_dev.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
756 fsl_edma->dma_dev.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
757 }
758
759 fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
760 if (drvdata->flags & FSL_EDMA_DRV_DEV_TO_DEV)
761 fsl_edma->dma_dev.directions |= BIT(DMA_DEV_TO_DEV);
762
763 fsl_edma->dma_dev.copy_align = drvdata->flags & FSL_EDMA_DRV_ALIGN_64BYTE ?
764 DMAENGINE_ALIGN_64_BYTES :
765 DMAENGINE_ALIGN_32_BYTES;
766
767 /* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
768 dma_set_max_seg_size(fsl_edma->dma_dev.dev,
769 FIELD_GET(EDMA_TCD_ITER_MASK, EDMA_TCD_ITER_MASK));
770
771 fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
772
773 platform_set_drvdata(pdev, fsl_edma);
774
775 ret = dma_async_device_register(&fsl_edma->dma_dev);
776 if (ret) {
777 dev_err(&pdev->dev,
778 "Can't register Freescale eDMA engine. (%d)\n", ret);
779 return ret;
780 }
781
782 ret = of_dma_controller_register(np,
783 drvdata->dmamuxs ? fsl_edma_xlate : fsl_edma3_xlate,
784 fsl_edma);
785 if (ret) {
786 dev_err(&pdev->dev,
787 "Can't register Freescale eDMA of_dma. (%d)\n", ret);
788 dma_async_device_unregister(&fsl_edma->dma_dev);
789 return ret;
790 }
791
792 /* enable round robin arbitration */
793 if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
794 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
795
796 return 0;
797 }
798
fsl_edma_remove(struct platform_device * pdev)799 static void fsl_edma_remove(struct platform_device *pdev)
800 {
801 struct device_node *np = pdev->dev.of_node;
802 struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
803
804 fsl_edma_irq_exit(pdev, fsl_edma);
805 fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
806 of_dma_controller_free(np);
807 dma_async_device_unregister(&fsl_edma->dma_dev);
808 fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
809 }
810
fsl_edma_suspend_late(struct device * dev)811 static int fsl_edma_suspend_late(struct device *dev)
812 {
813 struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
814 struct fsl_edma_chan *fsl_chan;
815 unsigned long flags;
816 int i;
817
818 for (i = 0; i < fsl_edma->n_chans; i++) {
819 fsl_chan = &fsl_edma->chans[i];
820 if (fsl_edma->chan_masked & BIT(i))
821 continue;
822 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
823 /* Make sure chan is idle or will force disable. */
824 if (unlikely(fsl_chan->status == DMA_IN_PROGRESS)) {
825 dev_warn(dev, "WARN: There is non-idle channel.");
826 fsl_edma_disable_request(fsl_chan);
827 fsl_edma_chan_mux(fsl_chan, 0, false);
828 }
829
830 fsl_chan->pm_state = SUSPENDED;
831 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
832 }
833
834 return 0;
835 }
836
fsl_edma_resume_early(struct device * dev)837 static int fsl_edma_resume_early(struct device *dev)
838 {
839 struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
840 struct fsl_edma_chan *fsl_chan;
841 struct edma_regs *regs = &fsl_edma->regs;
842 int i;
843
844 for (i = 0; i < fsl_edma->n_chans; i++) {
845 fsl_chan = &fsl_edma->chans[i];
846 if (fsl_edma->chan_masked & BIT(i))
847 continue;
848 fsl_chan->pm_state = RUNNING;
849 edma_write_tcdreg(fsl_chan, 0, csr);
850 if (fsl_chan->srcid != 0)
851 fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid, true);
852 }
853
854 if (!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
855 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
856
857 return 0;
858 }
859
860 /*
861 * eDMA provides the service to others, so it should be suspend late
862 * and resume early. When eDMA suspend, all of the clients should stop
863 * the DMA data transmission and let the channel idle.
864 */
865 static const struct dev_pm_ops fsl_edma_pm_ops = {
866 .suspend_late = fsl_edma_suspend_late,
867 .resume_early = fsl_edma_resume_early,
868 };
869
870 static struct platform_driver fsl_edma_driver = {
871 .driver = {
872 .name = "fsl-edma",
873 .of_match_table = fsl_edma_dt_ids,
874 .pm = &fsl_edma_pm_ops,
875 },
876 .probe = fsl_edma_probe,
877 .remove = fsl_edma_remove,
878 };
879
fsl_edma_init(void)880 static int __init fsl_edma_init(void)
881 {
882 return platform_driver_register(&fsl_edma_driver);
883 }
884 subsys_initcall(fsl_edma_init);
885
fsl_edma_exit(void)886 static void __exit fsl_edma_exit(void)
887 {
888 platform_driver_unregister(&fsl_edma_driver);
889 }
890 module_exit(fsl_edma_exit);
891
892 MODULE_ALIAS("platform:fsl-edma");
893 MODULE_DESCRIPTION("Freescale eDMA engine driver");
894 MODULE_LICENSE("GPL v2");
895