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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
4 */
5
6#include <linux/clk.h>
7#include <linux/firmware/imx/ipc.h>
8#include <linux/interrupt.h>
9#include <linux/io.h>
10#include <linux/iopoll.h>
11#include <linux/kernel.h>
12#include <linux/mailbox_controller.h>
13#include <linux/module.h>
14#include <linux/of_device.h>
15#include <linux/pm_runtime.h>
16#include <linux/slab.h>
17
18#define IMX_MU_xSR_GIPn(x) BIT(28 + (3 - (x)))
19#define IMX_MU_xSR_RFn(x) BIT(24 + (3 - (x)))
20#define IMX_MU_xSR_TEn(x) BIT(20 + (3 - (x)))
21#define IMX_MU_xSR_BRDIP BIT(9)
22
23/* General Purpose Interrupt Enable */
24#define IMX_MU_xCR_GIEn(x) BIT(28 + (3 - (x)))
25/* Receive Interrupt Enable */
26#define IMX_MU_xCR_RIEn(x) BIT(24 + (3 - (x)))
27/* Transmit Interrupt Enable */
28#define IMX_MU_xCR_TIEn(x) BIT(20 + (3 - (x)))
29/* General Purpose Interrupt Request */
30#define IMX_MU_xCR_GIRn(x) BIT(16 + (3 - (x)))
31
32#define IMX_MU_CHANS 16
33/* TX0/RX0/RXDB[0-3] */
34#define IMX_MU_SCU_CHANS 6
35#define IMX_MU_CHAN_NAME_SIZE 20
36
37enum imx_mu_chan_type {
38 IMX_MU_TYPE_TX, /* Tx */
39 IMX_MU_TYPE_RX, /* Rx */
40 IMX_MU_TYPE_TXDB, /* Tx doorbell */
41 IMX_MU_TYPE_RXDB, /* Rx doorbell */
42};
43
44struct imx_sc_rpc_msg_max {
45 struct imx_sc_rpc_msg hdr;
46 u32 data[7];
47};
48
49struct imx_mu_con_priv {
50 unsigned int idx;
51 char irq_desc[IMX_MU_CHAN_NAME_SIZE];
52 enum imx_mu_chan_type type;
53 struct mbox_chan *chan;
54 struct tasklet_struct txdb_tasklet;
55};
56
57struct imx_mu_priv {
58 struct device *dev;
59 void __iomem *base;
60 spinlock_t xcr_lock; /* control register lock */
61
62 struct mbox_controller mbox;
63 struct mbox_chan mbox_chans[IMX_MU_CHANS];
64
65 struct imx_mu_con_priv con_priv[IMX_MU_CHANS];
66 const struct imx_mu_dcfg *dcfg;
67 struct clk *clk;
68 int irq;
69
70 u32 xcr;
71
72 bool side_b;
73};
74
75struct imx_mu_dcfg {
76 int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
77 int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
78 void (*init)(struct imx_mu_priv *priv);
79 u32 xTR[4]; /* Transmit Registers */
80 u32 xRR[4]; /* Receive Registers */
81 u32 xSR; /* Status Register */
82 u32 xCR; /* Control Register */
83};
84
85static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
86{
87 return container_of(mbox, struct imx_mu_priv, mbox);
88}
89
90static void imx_mu_write(struct imx_mu_priv *priv, u32 val, u32 offs)
91{
92 iowrite32(val, priv->base + offs);
93}
94
95static u32 imx_mu_read(struct imx_mu_priv *priv, u32 offs)
96{
97 return ioread32(priv->base + offs);
98}
99
100static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, u32 set, u32 clr)
101{
102 unsigned long flags;
103 u32 val;
104
105 spin_lock_irqsave(&priv->xcr_lock, flags);
106 val = imx_mu_read(priv, priv->dcfg->xCR);
107 val &= ~clr;
108 val |= set;
109 imx_mu_write(priv, val, priv->dcfg->xCR);
110 spin_unlock_irqrestore(&priv->xcr_lock, flags);
111
112 return val;
113}
114
115static int imx_mu_generic_tx(struct imx_mu_priv *priv,
116 struct imx_mu_con_priv *cp,
117 void *data)
118{
119 u32 *arg = data;
120
121 switch (cp->type) {
122 case IMX_MU_TYPE_TX:
123 imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
124 imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
125 break;
126 case IMX_MU_TYPE_TXDB:
127 imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
128 tasklet_schedule(&cp->txdb_tasklet);
129 break;
130 default:
131 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
132 return -EINVAL;
133 }
134
135 return 0;
136}
137
138static int imx_mu_generic_rx(struct imx_mu_priv *priv,
139 struct imx_mu_con_priv *cp)
140{
141 u32 dat;
142
143 dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
144 mbox_chan_received_data(cp->chan, (void *)&dat);
145
146 return 0;
147}
148
149static int imx_mu_scu_tx(struct imx_mu_priv *priv,
150 struct imx_mu_con_priv *cp,
151 void *data)
152{
153 struct imx_sc_rpc_msg_max *msg = data;
154 u32 *arg = data;
155 int i, ret;
156 u32 xsr;
157
158 switch (cp->type) {
159 case IMX_MU_TYPE_TX:
160 /*
161 * msg->hdr.size specifies the number of u32 words while
162 * sizeof yields bytes.
163 */
164
165 if (msg->hdr.size > sizeof(*msg) / 4) {
166 /*
167 * The real message size can be different to
168 * struct imx_sc_rpc_msg_max size
169 */
170 dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on TX; got: %i bytes\n", sizeof(*msg), msg->hdr.size << 2);
171 return -EINVAL;
172 }
173
174 for (i = 0; i < 4 && i < msg->hdr.size; i++)
175 imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
176 for (; i < msg->hdr.size; i++) {
177 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR,
178 xsr,
179 xsr & IMX_MU_xSR_TEn(i % 4),
180 0, 100);
181 if (ret) {
182 dev_err(priv->dev, "Send data index: %d timeout\n", i);
183 return ret;
184 }
185 imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
186 }
187
188 imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
189 break;
190 default:
191 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
192 return -EINVAL;
193 }
194
195 return 0;
196}
197
198static int imx_mu_scu_rx(struct imx_mu_priv *priv,
199 struct imx_mu_con_priv *cp)
200{
201 struct imx_sc_rpc_msg_max msg;
202 u32 *data = (u32 *)&msg;
203 int i, ret;
204 u32 xsr;
205
206 imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(0));
207 *data++ = imx_mu_read(priv, priv->dcfg->xRR[0]);
208
209 if (msg.hdr.size > sizeof(msg) / 4) {
210 dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on RX; got: %i bytes\n", sizeof(msg), msg.hdr.size << 2);
211 return -EINVAL;
212 }
213
214 for (i = 1; i < msg.hdr.size; i++) {
215 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR, xsr,
216 xsr & IMX_MU_xSR_RFn(i % 4), 0, 100);
217 if (ret) {
218 dev_err(priv->dev, "timeout read idx %d\n", i);
219 return ret;
220 }
221 *data++ = imx_mu_read(priv, priv->dcfg->xRR[i % 4]);
222 }
223
224 imx_mu_xcr_rmw(priv, IMX_MU_xCR_RIEn(0), 0);
225 mbox_chan_received_data(cp->chan, (void *)&msg);
226
227 return 0;
228}
229
230static void imx_mu_txdb_tasklet(unsigned long data)
231{
232 struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
233
234 mbox_chan_txdone(cp->chan, 0);
235}
236
237static irqreturn_t imx_mu_isr(int irq, void *p)
238{
239 struct mbox_chan *chan = p;
240 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
241 struct imx_mu_con_priv *cp = chan->con_priv;
242 u32 val, ctrl;
243
244 ctrl = imx_mu_read(priv, priv->dcfg->xCR);
245 val = imx_mu_read(priv, priv->dcfg->xSR);
246
247 switch (cp->type) {
248 case IMX_MU_TYPE_TX:
249 val &= IMX_MU_xSR_TEn(cp->idx) &
250 (ctrl & IMX_MU_xCR_TIEn(cp->idx));
251 break;
252 case IMX_MU_TYPE_RX:
253 val &= IMX_MU_xSR_RFn(cp->idx) &
254 (ctrl & IMX_MU_xCR_RIEn(cp->idx));
255 break;
256 case IMX_MU_TYPE_RXDB:
257 val &= IMX_MU_xSR_GIPn(cp->idx) &
258 (ctrl & IMX_MU_xCR_GIEn(cp->idx));
259 break;
260 default:
261 break;
262 }
263
264 if (!val)
265 return IRQ_NONE;
266
267 if (val == IMX_MU_xSR_TEn(cp->idx)) {
268 imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
269 mbox_chan_txdone(chan, 0);
270 } else if (val == IMX_MU_xSR_RFn(cp->idx)) {
271 priv->dcfg->rx(priv, cp);
272 } else if (val == IMX_MU_xSR_GIPn(cp->idx)) {
273 imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), priv->dcfg->xSR);
274 mbox_chan_received_data(chan, NULL);
275 } else {
276 dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
277 return IRQ_NONE;
278 }
279
280 return IRQ_HANDLED;
281}
282
283static int imx_mu_send_data(struct mbox_chan *chan, void *data)
284{
285 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
286 struct imx_mu_con_priv *cp = chan->con_priv;
287
288 return priv->dcfg->tx(priv, cp, data);
289}
290
291static int imx_mu_startup(struct mbox_chan *chan)
292{
293 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
294 struct imx_mu_con_priv *cp = chan->con_priv;
295 unsigned long irq_flag = IRQF_SHARED;
296 int ret;
297
298 pm_runtime_get_sync(priv->dev);
299 if (cp->type == IMX_MU_TYPE_TXDB) {
300 /* Tx doorbell don't have ACK support */
301 tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet,
302 (unsigned long)cp);
303 return 0;
304 }
305
306 /* IPC MU should be with IRQF_NO_SUSPEND set */
307 if (!priv->dev->pm_domain)
308 irq_flag |= IRQF_NO_SUSPEND;
309
310 ret = request_irq(priv->irq, imx_mu_isr, irq_flag,
311 cp->irq_desc, chan);
312 if (ret) {
313 dev_err(priv->dev,
314 "Unable to acquire IRQ %d\n", priv->irq);
315 return ret;
316 }
317
318 switch (cp->type) {
319 case IMX_MU_TYPE_RX:
320 imx_mu_xcr_rmw(priv, IMX_MU_xCR_RIEn(cp->idx), 0);
321 break;
322 case IMX_MU_TYPE_RXDB:
323 imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIEn(cp->idx), 0);
324 break;
325 default:
326 break;
327 }
328
329 return 0;
330}
331
332static void imx_mu_shutdown(struct mbox_chan *chan)
333{
334 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
335 struct imx_mu_con_priv *cp = chan->con_priv;
336
337 if (cp->type == IMX_MU_TYPE_TXDB) {
338 tasklet_kill(&cp->txdb_tasklet);
339 pm_runtime_put_sync(priv->dev);
340 return;
341 }
342
343 switch (cp->type) {
344 case IMX_MU_TYPE_TX:
345 imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
346 break;
347 case IMX_MU_TYPE_RX:
348 imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(cp->idx));
349 break;
350 case IMX_MU_TYPE_RXDB:
351 imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_GIEn(cp->idx));
352 break;
353 default:
354 break;
355 }
356
357 free_irq(priv->irq, chan);
358 pm_runtime_put_sync(priv->dev);
359}
360
361static const struct mbox_chan_ops imx_mu_ops = {
362 .send_data = imx_mu_send_data,
363 .startup = imx_mu_startup,
364 .shutdown = imx_mu_shutdown,
365};
366
367static struct mbox_chan *imx_mu_scu_xlate(struct mbox_controller *mbox,
368 const struct of_phandle_args *sp)
369{
370 u32 type, idx, chan;
371
372 if (sp->args_count != 2) {
373 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
374 return ERR_PTR(-EINVAL);
375 }
376
377 type = sp->args[0]; /* channel type */
378 idx = sp->args[1]; /* index */
379
380 switch (type) {
381 case IMX_MU_TYPE_TX:
382 case IMX_MU_TYPE_RX:
383 if (idx != 0)
384 dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
385 chan = type;
386 break;
387 case IMX_MU_TYPE_RXDB:
388 chan = 2 + idx;
389 break;
390 default:
391 dev_err(mbox->dev, "Invalid chan type: %d\n", type);
392 return ERR_PTR(-EINVAL);
393 }
394
395 if (chan >= mbox->num_chans) {
396 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
397 return ERR_PTR(-EINVAL);
398 }
399
400 return &mbox->chans[chan];
401}
402
403static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
404 const struct of_phandle_args *sp)
405{
406 u32 type, idx, chan;
407
408 if (sp->args_count != 2) {
409 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
410 return ERR_PTR(-EINVAL);
411 }
412
413 type = sp->args[0]; /* channel type */
414 idx = sp->args[1]; /* index */
415 chan = type * 4 + idx;
416
417 if (chan >= mbox->num_chans) {
418 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
419 return ERR_PTR(-EINVAL);
420 }
421
422 return &mbox->chans[chan];
423}
424
425static void imx_mu_init_generic(struct imx_mu_priv *priv)
426{
427 unsigned int i;
428
429 for (i = 0; i < IMX_MU_CHANS; i++) {
430 struct imx_mu_con_priv *cp = &priv->con_priv[i];
431
432 cp->idx = i % 4;
433 cp->type = i >> 2;
434 cp->chan = &priv->mbox_chans[i];
435 priv->mbox_chans[i].con_priv = cp;
436 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
437 "imx_mu_chan[%i-%i]", cp->type, cp->idx);
438 }
439
440 priv->mbox.num_chans = IMX_MU_CHANS;
441 priv->mbox.of_xlate = imx_mu_xlate;
442
443 if (priv->side_b)
444 return;
445
446 /* Set default MU configuration */
447 imx_mu_write(priv, 0, priv->dcfg->xCR);
448}
449
450static void imx_mu_init_scu(struct imx_mu_priv *priv)
451{
452 unsigned int i;
453
454 for (i = 0; i < IMX_MU_SCU_CHANS; i++) {
455 struct imx_mu_con_priv *cp = &priv->con_priv[i];
456
457 cp->idx = i < 2 ? 0 : i - 2;
458 cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
459 cp->chan = &priv->mbox_chans[i];
460 priv->mbox_chans[i].con_priv = cp;
461 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
462 "imx_mu_chan[%i-%i]", cp->type, cp->idx);
463 }
464
465 priv->mbox.num_chans = IMX_MU_SCU_CHANS;
466 priv->mbox.of_xlate = imx_mu_scu_xlate;
467
468 /* Set default MU configuration */
469 imx_mu_write(priv, 0, priv->dcfg->xCR);
470}
471
472static int imx_mu_probe(struct platform_device *pdev)
473{
474 struct device *dev = &pdev->dev;
475 struct device_node *np = dev->of_node;
476 struct imx_mu_priv *priv;
477 const struct imx_mu_dcfg *dcfg;
478 int ret;
479
480 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
481 if (!priv)
482 return -ENOMEM;
483
484 priv->dev = dev;
485
486 priv->base = devm_platform_ioremap_resource(pdev, 0);
487 if (IS_ERR(priv->base))
488 return PTR_ERR(priv->base);
489
490 priv->irq = platform_get_irq(pdev, 0);
491 if (priv->irq < 0)
492 return priv->irq;
493
494 dcfg = of_device_get_match_data(dev);
495 if (!dcfg)
496 return -EINVAL;
497 priv->dcfg = dcfg;
498
499 priv->clk = devm_clk_get(dev, NULL);
500 if (IS_ERR(priv->clk)) {
501 if (PTR_ERR(priv->clk) != -ENOENT)
502 return PTR_ERR(priv->clk);
503
504 priv->clk = NULL;
505 }
506
507 ret = clk_prepare_enable(priv->clk);
508 if (ret) {
509 dev_err(dev, "Failed to enable clock\n");
510 return ret;
511 }
512
513 priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
514
515 priv->dcfg->init(priv);
516
517 spin_lock_init(&priv->xcr_lock);
518
519 priv->mbox.dev = dev;
520 priv->mbox.ops = &imx_mu_ops;
521 priv->mbox.chans = priv->mbox_chans;
522 priv->mbox.txdone_irq = true;
523
524 platform_set_drvdata(pdev, priv);
525
526 ret = devm_mbox_controller_register(dev, &priv->mbox);
527 if (ret) {
528 clk_disable_unprepare(priv->clk);
529 return ret;
530 }
531
532 pm_runtime_enable(dev);
533
534 ret = pm_runtime_get_sync(dev);
535 if (ret < 0) {
536 pm_runtime_put_noidle(dev);
537 goto disable_runtime_pm;
538 }
539
540 ret = pm_runtime_put_sync(dev);
541 if (ret < 0)
542 goto disable_runtime_pm;
543
544 clk_disable_unprepare(priv->clk);
545
546 return 0;
547
548disable_runtime_pm:
549 pm_runtime_disable(dev);
550 clk_disable_unprepare(priv->clk);
551 return ret;
552}
553
554static int imx_mu_remove(struct platform_device *pdev)
555{
556 struct imx_mu_priv *priv = platform_get_drvdata(pdev);
557
558 pm_runtime_disable(priv->dev);
559
560 return 0;
561}
562
563static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
564 .tx = imx_mu_generic_tx,
565 .rx = imx_mu_generic_rx,
566 .init = imx_mu_init_generic,
567 .xTR = {0x0, 0x4, 0x8, 0xc},
568 .xRR = {0x10, 0x14, 0x18, 0x1c},
569 .xSR = 0x20,
570 .xCR = 0x24,
571};
572
573static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
574 .tx = imx_mu_generic_tx,
575 .rx = imx_mu_generic_rx,
576 .init = imx_mu_init_generic,
577 .xTR = {0x20, 0x24, 0x28, 0x2c},
578 .xRR = {0x40, 0x44, 0x48, 0x4c},
579 .xSR = 0x60,
580 .xCR = 0x64,
581};
582
583static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
584 .tx = imx_mu_scu_tx,
585 .rx = imx_mu_scu_rx,
586 .init = imx_mu_init_scu,
587 .xTR = {0x0, 0x4, 0x8, 0xc},
588 .xRR = {0x10, 0x14, 0x18, 0x1c},
589 .xSR = 0x20,
590 .xCR = 0x24,
591};
592
593static const struct of_device_id imx_mu_dt_ids[] = {
594 { .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
595 { .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
596 { .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
597 { },
598};
599MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
600
601static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
602{
603 struct imx_mu_priv *priv = dev_get_drvdata(dev);
604
605 if (!priv->clk)
606 priv->xcr = imx_mu_read(priv, priv->dcfg->xCR);
607
608 return 0;
609}
610
611static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
612{
613 struct imx_mu_priv *priv = dev_get_drvdata(dev);
614
615 /*
616 * ONLY restore MU when context lost, the TIE could
617 * be set during noirq resume as there is MU data
618 * communication going on, and restore the saved
619 * value will overwrite the TIE and cause MU data
620 * send failed, may lead to system freeze. This issue
621 * is observed by testing freeze mode suspend.
622 */
623 if (!imx_mu_read(priv, priv->dcfg->xCR) && !priv->clk)
624 imx_mu_write(priv, priv->xcr, priv->dcfg->xCR);
625
626 return 0;
627}
628
629static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
630{
631 struct imx_mu_priv *priv = dev_get_drvdata(dev);
632
633 clk_disable_unprepare(priv->clk);
634
635 return 0;
636}
637
638static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
639{
640 struct imx_mu_priv *priv = dev_get_drvdata(dev);
641 int ret;
642
643 ret = clk_prepare_enable(priv->clk);
644 if (ret)
645 dev_err(dev, "failed to enable clock\n");
646
647 return ret;
648}
649
650static const struct dev_pm_ops imx_mu_pm_ops = {
651 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_mu_suspend_noirq,
652 imx_mu_resume_noirq)
653 SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
654 imx_mu_runtime_resume, NULL)
655};
656
657static struct platform_driver imx_mu_driver = {
658 .probe = imx_mu_probe,
659 .remove = imx_mu_remove,
660 .driver = {
661 .name = "imx_mu",
662 .of_match_table = imx_mu_dt_ids,
663 .pm = &imx_mu_pm_ops,
664 },
665};
666module_platform_driver(imx_mu_driver);
667
668MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");
669MODULE_DESCRIPTION("Message Unit driver for i.MX");
670MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
4 * Copyright 2022 NXP, Peng Fan <peng.fan@nxp.com>
5 */
6
7#include <linux/bitfield.h>
8#include <linux/clk.h>
9#include <linux/firmware/imx/ipc.h>
10#include <linux/firmware/imx/s4.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/iopoll.h>
14#include <linux/jiffies.h>
15#include <linux/kernel.h>
16#include <linux/mailbox_controller.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/of_platform.h>
20#include <linux/platform_device.h>
21#include <linux/pm_runtime.h>
22#include <linux/suspend.h>
23#include <linux/slab.h>
24#include <linux/workqueue.h>
25
26#include "mailbox.h"
27
28#define IMX_MU_CHANS 24
29/* TX0/RX0/RXDB[0-3] */
30#define IMX_MU_SCU_CHANS 6
31/* TX0/RX0 */
32#define IMX_MU_S4_CHANS 2
33#define IMX_MU_CHAN_NAME_SIZE 32
34
35#define IMX_MU_V2_PAR_OFF 0x4
36#define IMX_MU_V2_TR_MASK GENMASK(7, 0)
37#define IMX_MU_V2_RR_MASK GENMASK(15, 8)
38
39#define IMX_MU_SECO_TX_TOUT (msecs_to_jiffies(3000))
40#define IMX_MU_SECO_RX_TOUT (msecs_to_jiffies(3000))
41
42/* Please not change TX & RX */
43enum imx_mu_chan_type {
44 IMX_MU_TYPE_TX = 0, /* Tx */
45 IMX_MU_TYPE_RX = 1, /* Rx */
46 IMX_MU_TYPE_TXDB = 2, /* Tx doorbell */
47 IMX_MU_TYPE_RXDB = 3, /* Rx doorbell */
48 IMX_MU_TYPE_RST = 4, /* Reset */
49 IMX_MU_TYPE_TXDB_V2 = 5, /* Tx doorbell with S/W ACK */
50};
51
52enum imx_mu_xcr {
53 IMX_MU_CR,
54 IMX_MU_GIER,
55 IMX_MU_GCR,
56 IMX_MU_TCR,
57 IMX_MU_RCR,
58 IMX_MU_xCR_MAX,
59};
60
61enum imx_mu_xsr {
62 IMX_MU_SR,
63 IMX_MU_GSR,
64 IMX_MU_TSR,
65 IMX_MU_RSR,
66 IMX_MU_xSR_MAX,
67};
68
69struct imx_sc_rpc_msg_max {
70 struct imx_sc_rpc_msg hdr;
71 u32 data[30];
72};
73
74struct imx_s4_rpc_msg_max {
75 struct imx_s4_rpc_msg hdr;
76 u32 data[254];
77};
78
79struct imx_mu_con_priv {
80 unsigned int idx;
81 char irq_desc[IMX_MU_CHAN_NAME_SIZE];
82 enum imx_mu_chan_type type;
83 struct mbox_chan *chan;
84 struct work_struct txdb_work;
85};
86
87struct imx_mu_priv {
88 struct device *dev;
89 void __iomem *base;
90 void *msg;
91 spinlock_t xcr_lock; /* control register lock */
92
93 struct mbox_controller mbox;
94 struct mbox_chan mbox_chans[IMX_MU_CHANS];
95
96 struct imx_mu_con_priv con_priv[IMX_MU_CHANS];
97 const struct imx_mu_dcfg *dcfg;
98 struct clk *clk;
99 int irq[IMX_MU_CHANS];
100 bool suspend;
101 bool side_b;
102
103 u32 xcr[IMX_MU_xCR_MAX];
104 u32 num_tr;
105 u32 num_rr;
106};
107
108enum imx_mu_type {
109 IMX_MU_V1,
110 IMX_MU_V2 = BIT(1),
111 IMX_MU_V2_S4 = BIT(15),
112 IMX_MU_V2_IRQ = BIT(16),
113};
114
115struct imx_mu_dcfg {
116 int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
117 int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
118 int (*rxdb)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
119 int (*init)(struct imx_mu_priv *priv);
120 enum imx_mu_type type;
121 u32 xTR; /* Transmit Register0 */
122 u32 xRR; /* Receive Register0 */
123 u32 xSR[IMX_MU_xSR_MAX]; /* Status Registers */
124 u32 xCR[IMX_MU_xCR_MAX]; /* Control Registers */
125};
126
127#define IMX_MU_xSR_GIPn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
128#define IMX_MU_xSR_RFn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
129#define IMX_MU_xSR_TEn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
130
131/* General Purpose Interrupt Enable */
132#define IMX_MU_xCR_GIEn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
133/* Receive Interrupt Enable */
134#define IMX_MU_xCR_RIEn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
135/* Transmit Interrupt Enable */
136#define IMX_MU_xCR_TIEn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
137/* General Purpose Interrupt Request */
138#define IMX_MU_xCR_GIRn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(16 + (3 - (x))))
139/* MU reset */
140#define IMX_MU_xCR_RST(type) (type & IMX_MU_V2 ? BIT(0) : BIT(5))
141#define IMX_MU_xSR_RST(type) (type & IMX_MU_V2 ? BIT(0) : BIT(7))
142
143
144static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
145{
146 return container_of(mbox, struct imx_mu_priv, mbox);
147}
148
149static void imx_mu_write(struct imx_mu_priv *priv, u32 val, u32 offs)
150{
151 iowrite32(val, priv->base + offs);
152}
153
154static u32 imx_mu_read(struct imx_mu_priv *priv, u32 offs)
155{
156 return ioread32(priv->base + offs);
157}
158
159static int imx_mu_tx_waiting_write(struct imx_mu_priv *priv, u32 val, u32 idx)
160{
161 u64 timeout_time = get_jiffies_64() + IMX_MU_SECO_TX_TOUT;
162 u32 status;
163 u32 can_write;
164
165 dev_dbg(priv->dev, "Trying to write %.8x to idx %d\n", val, idx);
166
167 do {
168 status = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_TSR]);
169 can_write = status & IMX_MU_xSR_TEn(priv->dcfg->type, idx % 4);
170 } while (!can_write && time_is_after_jiffies64(timeout_time));
171
172 if (!can_write) {
173 dev_err(priv->dev, "timeout trying to write %.8x at %d(%.8x)\n",
174 val, idx, status);
175 return -ETIME;
176 }
177
178 imx_mu_write(priv, val, priv->dcfg->xTR + (idx % 4) * 4);
179
180 return 0;
181}
182
183static int imx_mu_rx_waiting_read(struct imx_mu_priv *priv, u32 *val, u32 idx)
184{
185 u64 timeout_time = get_jiffies_64() + IMX_MU_SECO_RX_TOUT;
186 u32 status;
187 u32 can_read;
188
189 dev_dbg(priv->dev, "Trying to read from idx %d\n", idx);
190
191 do {
192 status = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
193 can_read = status & IMX_MU_xSR_RFn(priv->dcfg->type, idx % 4);
194 } while (!can_read && time_is_after_jiffies64(timeout_time));
195
196 if (!can_read) {
197 dev_err(priv->dev, "timeout trying to read idx %d (%.8x)\n",
198 idx, status);
199 return -ETIME;
200 }
201
202 *val = imx_mu_read(priv, priv->dcfg->xRR + (idx % 4) * 4);
203 dev_dbg(priv->dev, "Read %.8x\n", *val);
204
205 return 0;
206}
207
208static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, enum imx_mu_xcr type, u32 set, u32 clr)
209{
210 unsigned long flags;
211 u32 val;
212
213 spin_lock_irqsave(&priv->xcr_lock, flags);
214 val = imx_mu_read(priv, priv->dcfg->xCR[type]);
215 val &= ~clr;
216 val |= set;
217 imx_mu_write(priv, val, priv->dcfg->xCR[type]);
218 spin_unlock_irqrestore(&priv->xcr_lock, flags);
219
220 return val;
221}
222
223static int imx_mu_generic_tx(struct imx_mu_priv *priv,
224 struct imx_mu_con_priv *cp,
225 void *data)
226{
227 u32 *arg = data;
228 u32 val;
229 int ret;
230
231 switch (cp->type) {
232 case IMX_MU_TYPE_TX:
233 imx_mu_write(priv, *arg, priv->dcfg->xTR + cp->idx * 4);
234 imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
235 break;
236 case IMX_MU_TYPE_TXDB:
237 imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
238 queue_work(system_bh_wq, &cp->txdb_work);
239 break;
240 case IMX_MU_TYPE_TXDB_V2:
241 imx_mu_write(priv, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx),
242 priv->dcfg->xCR[IMX_MU_GCR]);
243 ret = readl_poll_timeout(priv->base + priv->dcfg->xCR[IMX_MU_GCR], val,
244 !(val & IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx)),
245 0, 1000);
246 if (ret)
247 dev_warn_ratelimited(priv->dev, "channel type: %d failure\n", cp->type);
248 break;
249 default:
250 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
251 return -EINVAL;
252 }
253
254 return 0;
255}
256
257static int imx_mu_generic_rx(struct imx_mu_priv *priv,
258 struct imx_mu_con_priv *cp)
259{
260 u32 dat;
261
262 dat = imx_mu_read(priv, priv->dcfg->xRR + (cp->idx) * 4);
263 mbox_chan_received_data(cp->chan, (void *)&dat);
264
265 return 0;
266}
267
268static int imx_mu_generic_rxdb(struct imx_mu_priv *priv,
269 struct imx_mu_con_priv *cp)
270{
271 imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
272 priv->dcfg->xSR[IMX_MU_GSR]);
273 mbox_chan_received_data(cp->chan, NULL);
274
275 return 0;
276}
277
278static int imx_mu_specific_tx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data)
279{
280 u32 *arg = data;
281 u32 num_tr = priv->num_tr;
282 int i, ret;
283 u32 xsr;
284 u32 size, max_size;
285
286 if (priv->dcfg->type & IMX_MU_V2_S4) {
287 size = ((struct imx_s4_rpc_msg_max *)data)->hdr.size;
288 max_size = sizeof(struct imx_s4_rpc_msg_max);
289 } else {
290 size = ((struct imx_sc_rpc_msg_max *)data)->hdr.size;
291 max_size = sizeof(struct imx_sc_rpc_msg_max);
292 }
293
294 switch (cp->type) {
295 case IMX_MU_TYPE_TX:
296 /*
297 * msg->hdr.size specifies the number of u32 words while
298 * sizeof yields bytes.
299 */
300
301 if (size > max_size / 4) {
302 /*
303 * The real message size can be different to
304 * struct imx_sc_rpc_msg_max/imx_s4_rpc_msg_max size
305 */
306 dev_err(priv->dev, "Maximal message size (%u bytes) exceeded on TX; got: %i bytes\n", max_size, size << 2);
307 return -EINVAL;
308 }
309
310 for (i = 0; i < num_tr && i < size; i++)
311 imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % num_tr) * 4);
312 for (; i < size; i++) {
313 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_TSR],
314 xsr,
315 xsr & IMX_MU_xSR_TEn(priv->dcfg->type, i % num_tr),
316 0, 5 * USEC_PER_SEC);
317 if (ret) {
318 dev_err(priv->dev, "Send data index: %d timeout\n", i);
319 return ret;
320 }
321 imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % num_tr) * 4);
322 }
323
324 imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
325 break;
326 default:
327 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
328 return -EINVAL;
329 }
330
331 return 0;
332}
333
334static int imx_mu_specific_rx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp)
335{
336 u32 *data;
337 int i, ret;
338 u32 xsr;
339 u32 size, max_size;
340 u32 num_rr = priv->num_rr;
341
342 data = (u32 *)priv->msg;
343
344 imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, 0));
345 *data++ = imx_mu_read(priv, priv->dcfg->xRR);
346
347 if (priv->dcfg->type & IMX_MU_V2_S4) {
348 size = ((struct imx_s4_rpc_msg_max *)priv->msg)->hdr.size;
349 max_size = sizeof(struct imx_s4_rpc_msg_max);
350 } else {
351 size = ((struct imx_sc_rpc_msg_max *)priv->msg)->hdr.size;
352 max_size = sizeof(struct imx_sc_rpc_msg_max);
353 }
354
355 if (size > max_size / 4) {
356 dev_err(priv->dev, "Maximal message size (%u bytes) exceeded on RX; got: %i bytes\n", max_size, size << 2);
357 return -EINVAL;
358 }
359
360 for (i = 1; i < size; i++) {
361 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_RSR], xsr,
362 xsr & IMX_MU_xSR_RFn(priv->dcfg->type, i % num_rr), 0,
363 5 * USEC_PER_SEC);
364 if (ret) {
365 dev_err(priv->dev, "timeout read idx %d\n", i);
366 return ret;
367 }
368 *data++ = imx_mu_read(priv, priv->dcfg->xRR + (i % num_rr) * 4);
369 }
370
371 imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);
372 mbox_chan_received_data(cp->chan, (void *)priv->msg);
373
374 return 0;
375}
376
377static int imx_mu_seco_tx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp,
378 void *data)
379{
380 struct imx_sc_rpc_msg_max *msg = data;
381 u32 *arg = data;
382 u32 byte_size;
383 int err;
384 int i;
385
386 dev_dbg(priv->dev, "Sending message\n");
387
388 switch (cp->type) {
389 case IMX_MU_TYPE_TXDB:
390 byte_size = msg->hdr.size * sizeof(u32);
391 if (byte_size > sizeof(*msg)) {
392 /*
393 * The real message size can be different to
394 * struct imx_sc_rpc_msg_max size
395 */
396 dev_err(priv->dev,
397 "Exceed max msg size (%zu) on TX, got: %i\n",
398 sizeof(*msg), byte_size);
399 return -EINVAL;
400 }
401
402 print_hex_dump_debug("from client ", DUMP_PREFIX_OFFSET, 4, 4,
403 data, byte_size, false);
404
405 /* Send first word */
406 dev_dbg(priv->dev, "Sending header\n");
407 imx_mu_write(priv, *arg++, priv->dcfg->xTR);
408
409 /* Send signaling */
410 dev_dbg(priv->dev, "Sending signaling\n");
411 imx_mu_xcr_rmw(priv, IMX_MU_GCR,
412 IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
413
414 /* Send words to fill the mailbox */
415 for (i = 1; i < 4 && i < msg->hdr.size; i++) {
416 dev_dbg(priv->dev, "Sending word %d\n", i);
417 imx_mu_write(priv, *arg++,
418 priv->dcfg->xTR + (i % 4) * 4);
419 }
420
421 /* Send rest of message waiting for remote read */
422 for (; i < msg->hdr.size; i++) {
423 dev_dbg(priv->dev, "Sending word %d\n", i);
424 err = imx_mu_tx_waiting_write(priv, *arg++, i);
425 if (err) {
426 dev_err(priv->dev, "Timeout tx %d\n", i);
427 return err;
428 }
429 }
430
431 /* Simulate hack for mbox framework */
432 queue_work(system_bh_wq, &cp->txdb_work);
433
434 break;
435 default:
436 dev_warn_ratelimited(priv->dev,
437 "Send data on wrong channel type: %d\n",
438 cp->type);
439 return -EINVAL;
440 }
441
442 return 0;
443}
444
445static int imx_mu_seco_rxdb(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp)
446{
447 struct imx_sc_rpc_msg_max msg;
448 u32 *data = (u32 *)&msg;
449 u32 byte_size;
450 int err = 0;
451 int i;
452
453 dev_dbg(priv->dev, "Receiving message\n");
454
455 /* Read header */
456 dev_dbg(priv->dev, "Receiving header\n");
457 *data++ = imx_mu_read(priv, priv->dcfg->xRR);
458 byte_size = msg.hdr.size * sizeof(u32);
459 if (byte_size > sizeof(msg)) {
460 dev_err(priv->dev, "Exceed max msg size (%zu) on RX, got: %i\n",
461 sizeof(msg), byte_size);
462 err = -EINVAL;
463 goto error;
464 }
465
466 /* Read message waiting they are written */
467 for (i = 1; i < msg.hdr.size; i++) {
468 dev_dbg(priv->dev, "Receiving word %d\n", i);
469 err = imx_mu_rx_waiting_read(priv, data++, i);
470 if (err) {
471 dev_err(priv->dev, "Timeout rx %d\n", i);
472 goto error;
473 }
474 }
475
476 /* Clear GIP */
477 imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
478 priv->dcfg->xSR[IMX_MU_GSR]);
479
480 print_hex_dump_debug("to client ", DUMP_PREFIX_OFFSET, 4, 4,
481 &msg, byte_size, false);
482
483 /* send data to client */
484 dev_dbg(priv->dev, "Sending message to client\n");
485 mbox_chan_received_data(cp->chan, (void *)&msg);
486
487 goto exit;
488
489error:
490 mbox_chan_received_data(cp->chan, ERR_PTR(err));
491
492exit:
493 return err;
494}
495
496static void imx_mu_txdb_work(struct work_struct *t)
497{
498 struct imx_mu_con_priv *cp = from_work(cp, t, txdb_work);
499
500 mbox_chan_txdone(cp->chan, 0);
501}
502
503static irqreturn_t imx_mu_isr(int irq, void *p)
504{
505 struct mbox_chan *chan = p;
506 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
507 struct imx_mu_con_priv *cp = chan->con_priv;
508 u32 val, ctrl;
509
510 switch (cp->type) {
511 case IMX_MU_TYPE_TX:
512 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_TCR]);
513 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_TSR]);
514 val &= IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx) &
515 (ctrl & IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
516 break;
517 case IMX_MU_TYPE_RX:
518 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_RCR]);
519 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
520 val &= IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx) &
521 (ctrl & IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
522 break;
523 case IMX_MU_TYPE_RXDB:
524 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_GIER]);
525 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
526 val &= IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx) &
527 (ctrl & IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
528 break;
529 case IMX_MU_TYPE_RST:
530 return IRQ_NONE;
531 default:
532 dev_warn_ratelimited(priv->dev, "Unhandled channel type %d\n",
533 cp->type);
534 return IRQ_NONE;
535 }
536
537 if (!val)
538 return IRQ_NONE;
539
540 if ((val == IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx)) &&
541 (cp->type == IMX_MU_TYPE_TX)) {
542 imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
543 mbox_chan_txdone(chan, 0);
544 } else if ((val == IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx)) &&
545 (cp->type == IMX_MU_TYPE_RX)) {
546 priv->dcfg->rx(priv, cp);
547 } else if ((val == IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx)) &&
548 (cp->type == IMX_MU_TYPE_RXDB)) {
549 priv->dcfg->rxdb(priv, cp);
550 } else {
551 dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
552 return IRQ_NONE;
553 }
554
555 if (priv->suspend)
556 pm_system_wakeup();
557
558 return IRQ_HANDLED;
559}
560
561static int imx_mu_send_data(struct mbox_chan *chan, void *data)
562{
563 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
564 struct imx_mu_con_priv *cp = chan->con_priv;
565
566 return priv->dcfg->tx(priv, cp, data);
567}
568
569static int imx_mu_startup(struct mbox_chan *chan)
570{
571 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
572 struct imx_mu_con_priv *cp = chan->con_priv;
573 unsigned long irq_flag = 0;
574 int ret;
575
576 pm_runtime_get_sync(priv->dev);
577 if (cp->type == IMX_MU_TYPE_TXDB_V2)
578 return 0;
579
580 if (cp->type == IMX_MU_TYPE_TXDB) {
581 /* Tx doorbell don't have ACK support */
582 INIT_WORK(&cp->txdb_work, imx_mu_txdb_work);
583 return 0;
584 }
585
586 /* IPC MU should be with IRQF_NO_SUSPEND set */
587 if (!priv->dev->pm_domain)
588 irq_flag |= IRQF_NO_SUSPEND;
589
590 if (!(priv->dcfg->type & IMX_MU_V2_IRQ))
591 irq_flag |= IRQF_SHARED;
592
593 ret = request_irq(priv->irq[cp->type], imx_mu_isr, irq_flag, cp->irq_desc, chan);
594 if (ret) {
595 dev_err(priv->dev, "Unable to acquire IRQ %d\n", priv->irq[cp->type]);
596 return ret;
597 }
598
599 switch (cp->type) {
600 case IMX_MU_TYPE_RX:
601 imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx), 0);
602 break;
603 case IMX_MU_TYPE_RXDB:
604 imx_mu_xcr_rmw(priv, IMX_MU_GIER, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx), 0);
605 break;
606 default:
607 break;
608 }
609
610 return 0;
611}
612
613static void imx_mu_shutdown(struct mbox_chan *chan)
614{
615 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
616 struct imx_mu_con_priv *cp = chan->con_priv;
617 int ret;
618 u32 sr;
619
620 if (cp->type == IMX_MU_TYPE_TXDB_V2) {
621 pm_runtime_put_sync(priv->dev);
622 return;
623 }
624
625 if (cp->type == IMX_MU_TYPE_TXDB) {
626 cancel_work_sync(&cp->txdb_work);
627 pm_runtime_put_sync(priv->dev);
628 return;
629 }
630
631 switch (cp->type) {
632 case IMX_MU_TYPE_TX:
633 imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
634 break;
635 case IMX_MU_TYPE_RX:
636 imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
637 break;
638 case IMX_MU_TYPE_RXDB:
639 imx_mu_xcr_rmw(priv, IMX_MU_GIER, 0, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
640 break;
641 case IMX_MU_TYPE_RST:
642 imx_mu_xcr_rmw(priv, IMX_MU_CR, IMX_MU_xCR_RST(priv->dcfg->type), 0);
643 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_SR], sr,
644 !(sr & IMX_MU_xSR_RST(priv->dcfg->type)), 1, 5);
645 if (ret)
646 dev_warn(priv->dev, "RST channel timeout\n");
647 break;
648 default:
649 break;
650 }
651
652 free_irq(priv->irq[cp->type], chan);
653 pm_runtime_put_sync(priv->dev);
654}
655
656static const struct mbox_chan_ops imx_mu_ops = {
657 .send_data = imx_mu_send_data,
658 .startup = imx_mu_startup,
659 .shutdown = imx_mu_shutdown,
660};
661
662static struct mbox_chan *imx_mu_specific_xlate(struct mbox_controller *mbox,
663 const struct of_phandle_args *sp)
664{
665 u32 type, idx, chan;
666
667 if (sp->args_count != 2) {
668 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
669 return ERR_PTR(-EINVAL);
670 }
671
672 type = sp->args[0]; /* channel type */
673 idx = sp->args[1]; /* index */
674
675 switch (type) {
676 case IMX_MU_TYPE_TX:
677 case IMX_MU_TYPE_RX:
678 if (idx != 0)
679 dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
680 chan = type;
681 break;
682 case IMX_MU_TYPE_RXDB:
683 chan = 2 + idx;
684 break;
685 default:
686 dev_err(mbox->dev, "Invalid chan type: %d\n", type);
687 return ERR_PTR(-EINVAL);
688 }
689
690 if (chan >= mbox->num_chans) {
691 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
692 return ERR_PTR(-EINVAL);
693 }
694
695 return &mbox->chans[chan];
696}
697
698static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
699 const struct of_phandle_args *sp)
700{
701 struct mbox_chan *p_chan;
702 u32 type, idx, chan;
703
704 if (sp->args_count != 2) {
705 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
706 return ERR_PTR(-EINVAL);
707 }
708
709 type = sp->args[0]; /* channel type */
710 idx = sp->args[1]; /* index */
711
712 /* RST only supports 1 channel */
713 if ((type == IMX_MU_TYPE_RST) && idx) {
714 dev_err(mbox->dev, "Invalid RST channel %d\n", idx);
715 return ERR_PTR(-EINVAL);
716 }
717
718 chan = type * 4 + idx;
719 if (chan >= mbox->num_chans) {
720 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
721 return ERR_PTR(-EINVAL);
722 }
723
724 p_chan = &mbox->chans[chan];
725
726 if (type == IMX_MU_TYPE_TXDB_V2)
727 p_chan->txdone_method = TXDONE_BY_ACK;
728
729 return p_chan;
730}
731
732static struct mbox_chan *imx_mu_seco_xlate(struct mbox_controller *mbox,
733 const struct of_phandle_args *sp)
734{
735 u32 type;
736
737 if (sp->args_count < 1) {
738 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
739 return ERR_PTR(-EINVAL);
740 }
741
742 type = sp->args[0]; /* channel type */
743
744 /* Only supports TXDB and RXDB */
745 if (type == IMX_MU_TYPE_TX || type == IMX_MU_TYPE_RX) {
746 dev_err(mbox->dev, "Invalid type: %d\n", type);
747 return ERR_PTR(-EINVAL);
748 }
749
750 return imx_mu_xlate(mbox, sp);
751}
752
753static void imx_mu_get_tr_rr(struct imx_mu_priv *priv)
754{
755 u32 val;
756
757 if (priv->dcfg->type & IMX_MU_V2) {
758 val = imx_mu_read(priv, IMX_MU_V2_PAR_OFF);
759 priv->num_tr = FIELD_GET(IMX_MU_V2_TR_MASK, val);
760 priv->num_rr = FIELD_GET(IMX_MU_V2_RR_MASK, val);
761 } else {
762 priv->num_tr = 4;
763 priv->num_rr = 4;
764 }
765}
766
767static int imx_mu_init_generic(struct imx_mu_priv *priv)
768{
769 unsigned int i;
770 unsigned int val;
771
772 if (priv->num_rr > 4 || priv->num_tr > 4) {
773 WARN_ONCE(true, "%s not support TR/RR larger than 4\n", __func__);
774 return -EOPNOTSUPP;
775 }
776
777 for (i = 0; i < IMX_MU_CHANS; i++) {
778 struct imx_mu_con_priv *cp = &priv->con_priv[i];
779
780 cp->idx = i % 4;
781 cp->type = i >> 2;
782 cp->chan = &priv->mbox_chans[i];
783 priv->mbox_chans[i].con_priv = cp;
784 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
785 "%s[%i-%u]", dev_name(priv->dev), cp->type, cp->idx);
786 }
787
788 priv->mbox.num_chans = IMX_MU_CHANS;
789 priv->mbox.of_xlate = imx_mu_xlate;
790
791 if (priv->side_b)
792 return 0;
793
794 /* Set default MU configuration */
795 for (i = 0; i < IMX_MU_xCR_MAX; i++)
796 imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
797
798 /* Clear any pending GIP */
799 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
800 imx_mu_write(priv, val, priv->dcfg->xSR[IMX_MU_GSR]);
801
802 /* Clear any pending RSR */
803 for (i = 0; i < priv->num_rr; i++)
804 imx_mu_read(priv, priv->dcfg->xRR + i * 4);
805
806 return 0;
807}
808
809static int imx_mu_init_specific(struct imx_mu_priv *priv)
810{
811 unsigned int i;
812 int num_chans = priv->dcfg->type & IMX_MU_V2_S4 ? IMX_MU_S4_CHANS : IMX_MU_SCU_CHANS;
813
814 for (i = 0; i < num_chans; i++) {
815 struct imx_mu_con_priv *cp = &priv->con_priv[i];
816
817 cp->idx = i < 2 ? 0 : i - 2;
818 cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
819 cp->chan = &priv->mbox_chans[i];
820 priv->mbox_chans[i].con_priv = cp;
821 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
822 "%s[%i-%u]", dev_name(priv->dev), cp->type, cp->idx);
823 }
824
825 priv->mbox.num_chans = num_chans;
826 priv->mbox.of_xlate = imx_mu_specific_xlate;
827
828 /* Set default MU configuration */
829 for (i = 0; i < IMX_MU_xCR_MAX; i++)
830 imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
831
832 return 0;
833}
834
835static int imx_mu_init_seco(struct imx_mu_priv *priv)
836{
837 int ret;
838
839 ret = imx_mu_init_generic(priv);
840 if (ret)
841 return ret;
842 priv->mbox.of_xlate = imx_mu_seco_xlate;
843
844 return 0;
845}
846
847static int imx_mu_probe(struct platform_device *pdev)
848{
849 struct device *dev = &pdev->dev;
850 struct device_node *np = dev->of_node;
851 struct imx_mu_priv *priv;
852 const struct imx_mu_dcfg *dcfg;
853 int i, ret;
854 u32 size;
855
856 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
857 if (!priv)
858 return -ENOMEM;
859
860 priv->dev = dev;
861
862 priv->base = devm_platform_ioremap_resource(pdev, 0);
863 if (IS_ERR(priv->base))
864 return PTR_ERR(priv->base);
865
866 dcfg = of_device_get_match_data(dev);
867 if (!dcfg)
868 return -EINVAL;
869 priv->dcfg = dcfg;
870 if (priv->dcfg->type & IMX_MU_V2_IRQ) {
871 priv->irq[IMX_MU_TYPE_TX] = platform_get_irq_byname(pdev, "tx");
872 if (priv->irq[IMX_MU_TYPE_TX] < 0)
873 return priv->irq[IMX_MU_TYPE_TX];
874 priv->irq[IMX_MU_TYPE_RX] = platform_get_irq_byname(pdev, "rx");
875 if (priv->irq[IMX_MU_TYPE_RX] < 0)
876 return priv->irq[IMX_MU_TYPE_RX];
877 } else {
878 ret = platform_get_irq(pdev, 0);
879 if (ret < 0)
880 return ret;
881
882 for (i = 0; i < IMX_MU_CHANS; i++)
883 priv->irq[i] = ret;
884 }
885
886 if (priv->dcfg->type & IMX_MU_V2_S4)
887 size = sizeof(struct imx_s4_rpc_msg_max);
888 else
889 size = sizeof(struct imx_sc_rpc_msg_max);
890
891 priv->msg = devm_kzalloc(dev, size, GFP_KERNEL);
892 if (!priv->msg)
893 return -ENOMEM;
894
895 priv->clk = devm_clk_get(dev, NULL);
896 if (IS_ERR(priv->clk)) {
897 if (PTR_ERR(priv->clk) != -ENOENT)
898 return PTR_ERR(priv->clk);
899
900 priv->clk = NULL;
901 }
902
903 ret = clk_prepare_enable(priv->clk);
904 if (ret) {
905 dev_err(dev, "Failed to enable clock\n");
906 return ret;
907 }
908
909 imx_mu_get_tr_rr(priv);
910
911 priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
912
913 ret = priv->dcfg->init(priv);
914 if (ret) {
915 dev_err(dev, "Failed to init MU\n");
916 goto disable_clk;
917 }
918
919 spin_lock_init(&priv->xcr_lock);
920
921 priv->mbox.dev = dev;
922 priv->mbox.ops = &imx_mu_ops;
923 priv->mbox.chans = priv->mbox_chans;
924 priv->mbox.txdone_irq = true;
925
926 platform_set_drvdata(pdev, priv);
927
928 ret = devm_mbox_controller_register(dev, &priv->mbox);
929 if (ret)
930 goto disable_clk;
931
932 of_platform_populate(dev->of_node, NULL, NULL, dev);
933
934 pm_runtime_enable(dev);
935
936 ret = pm_runtime_resume_and_get(dev);
937 if (ret < 0)
938 goto disable_runtime_pm;
939
940 ret = pm_runtime_put_sync(dev);
941 if (ret < 0)
942 goto disable_runtime_pm;
943
944 clk_disable_unprepare(priv->clk);
945
946 return 0;
947
948disable_runtime_pm:
949 pm_runtime_disable(dev);
950disable_clk:
951 clk_disable_unprepare(priv->clk);
952 return ret;
953}
954
955static void imx_mu_remove(struct platform_device *pdev)
956{
957 struct imx_mu_priv *priv = platform_get_drvdata(pdev);
958
959 pm_runtime_disable(priv->dev);
960}
961
962static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
963 .tx = imx_mu_generic_tx,
964 .rx = imx_mu_generic_rx,
965 .rxdb = imx_mu_generic_rxdb,
966 .init = imx_mu_init_generic,
967 .xTR = 0x0,
968 .xRR = 0x10,
969 .xSR = {0x20, 0x20, 0x20, 0x20},
970 .xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
971};
972
973static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
974 .tx = imx_mu_generic_tx,
975 .rx = imx_mu_generic_rx,
976 .rxdb = imx_mu_generic_rxdb,
977 .init = imx_mu_init_generic,
978 .xTR = 0x20,
979 .xRR = 0x40,
980 .xSR = {0x60, 0x60, 0x60, 0x60},
981 .xCR = {0x64, 0x64, 0x64, 0x64, 0x64},
982};
983
984static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
985 .tx = imx_mu_generic_tx,
986 .rx = imx_mu_generic_rx,
987 .rxdb = imx_mu_generic_rxdb,
988 .init = imx_mu_init_generic,
989 .type = IMX_MU_V2,
990 .xTR = 0x200,
991 .xRR = 0x280,
992 .xSR = {0xC, 0x118, 0x124, 0x12C},
993 .xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
994};
995
996static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp_s4 = {
997 .tx = imx_mu_specific_tx,
998 .rx = imx_mu_specific_rx,
999 .init = imx_mu_init_specific,
1000 .type = IMX_MU_V2 | IMX_MU_V2_S4,
1001 .xTR = 0x200,
1002 .xRR = 0x280,
1003 .xSR = {0xC, 0x118, 0x124, 0x12C},
1004 .xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
1005};
1006
1007static const struct imx_mu_dcfg imx_mu_cfg_imx93_s4 = {
1008 .tx = imx_mu_specific_tx,
1009 .rx = imx_mu_specific_rx,
1010 .init = imx_mu_init_specific,
1011 .type = IMX_MU_V2 | IMX_MU_V2_S4 | IMX_MU_V2_IRQ,
1012 .xTR = 0x200,
1013 .xRR = 0x280,
1014 .xSR = {0xC, 0x118, 0x124, 0x12C},
1015 .xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
1016};
1017
1018static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
1019 .tx = imx_mu_specific_tx,
1020 .rx = imx_mu_specific_rx,
1021 .init = imx_mu_init_specific,
1022 .rxdb = imx_mu_generic_rxdb,
1023 .xTR = 0x0,
1024 .xRR = 0x10,
1025 .xSR = {0x20, 0x20, 0x20, 0x20},
1026 .xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
1027};
1028
1029static const struct imx_mu_dcfg imx_mu_cfg_imx8_seco = {
1030 .tx = imx_mu_seco_tx,
1031 .rx = imx_mu_generic_rx,
1032 .rxdb = imx_mu_seco_rxdb,
1033 .init = imx_mu_init_seco,
1034 .xTR = 0x0,
1035 .xRR = 0x10,
1036 .xSR = {0x20, 0x20, 0x20, 0x20},
1037 .xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
1038};
1039
1040static const struct of_device_id imx_mu_dt_ids[] = {
1041 { .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
1042 { .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
1043 { .compatible = "fsl,imx8ulp-mu", .data = &imx_mu_cfg_imx8ulp },
1044 { .compatible = "fsl,imx8ulp-mu-s4", .data = &imx_mu_cfg_imx8ulp_s4 },
1045 { .compatible = "fsl,imx93-mu-s4", .data = &imx_mu_cfg_imx93_s4 },
1046 { .compatible = "fsl,imx95-mu", .data = &imx_mu_cfg_imx8ulp },
1047 { .compatible = "fsl,imx95-mu-ele", .data = &imx_mu_cfg_imx8ulp_s4 },
1048 { .compatible = "fsl,imx95-mu-v2x", .data = &imx_mu_cfg_imx8ulp_s4 },
1049 { .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
1050 { .compatible = "fsl,imx8-mu-seco", .data = &imx_mu_cfg_imx8_seco },
1051 { },
1052};
1053MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
1054
1055static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
1056{
1057 struct imx_mu_priv *priv = dev_get_drvdata(dev);
1058 int i;
1059
1060 if (!priv->clk) {
1061 for (i = 0; i < IMX_MU_xCR_MAX; i++)
1062 priv->xcr[i] = imx_mu_read(priv, priv->dcfg->xCR[i]);
1063 }
1064
1065 priv->suspend = true;
1066
1067 return 0;
1068}
1069
1070static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
1071{
1072 struct imx_mu_priv *priv = dev_get_drvdata(dev);
1073 int i;
1074
1075 /*
1076 * ONLY restore MU when context lost, the TIE could
1077 * be set during noirq resume as there is MU data
1078 * communication going on, and restore the saved
1079 * value will overwrite the TIE and cause MU data
1080 * send failed, may lead to system freeze. This issue
1081 * is observed by testing freeze mode suspend.
1082 */
1083 if (!priv->clk && !imx_mu_read(priv, priv->dcfg->xCR[0])) {
1084 for (i = 0; i < IMX_MU_xCR_MAX; i++)
1085 imx_mu_write(priv, priv->xcr[i], priv->dcfg->xCR[i]);
1086 }
1087
1088 priv->suspend = false;
1089
1090 return 0;
1091}
1092
1093static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
1094{
1095 struct imx_mu_priv *priv = dev_get_drvdata(dev);
1096
1097 clk_disable_unprepare(priv->clk);
1098
1099 return 0;
1100}
1101
1102static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
1103{
1104 struct imx_mu_priv *priv = dev_get_drvdata(dev);
1105 int ret;
1106
1107 ret = clk_prepare_enable(priv->clk);
1108 if (ret)
1109 dev_err(dev, "failed to enable clock\n");
1110
1111 return ret;
1112}
1113
1114static const struct dev_pm_ops imx_mu_pm_ops = {
1115 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_mu_suspend_noirq,
1116 imx_mu_resume_noirq)
1117 SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
1118 imx_mu_runtime_resume, NULL)
1119};
1120
1121static struct platform_driver imx_mu_driver = {
1122 .probe = imx_mu_probe,
1123 .remove = imx_mu_remove,
1124 .driver = {
1125 .name = "imx_mu",
1126 .of_match_table = imx_mu_dt_ids,
1127 .pm = &imx_mu_pm_ops,
1128 },
1129};
1130module_platform_driver(imx_mu_driver);
1131
1132MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");
1133MODULE_DESCRIPTION("Message Unit driver for i.MX");
1134MODULE_LICENSE("GPL v2");