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_CHANS 16
19 /* TX0/RX0/RXDB[0-3] */
20 #define IMX_MU_SCU_CHANS 6
21 #define IMX_MU_CHAN_NAME_SIZE 20
22
23 enum imx_mu_chan_type {
24 IMX_MU_TYPE_TX, /* Tx */
25 IMX_MU_TYPE_RX, /* Rx */
26 IMX_MU_TYPE_TXDB, /* Tx doorbell */
27 IMX_MU_TYPE_RXDB, /* Rx doorbell */
28 };
29
30 enum imx_mu_xcr {
31 IMX_MU_GIER,
32 IMX_MU_GCR,
33 IMX_MU_TCR,
34 IMX_MU_RCR,
35 IMX_MU_xCR_MAX,
36 };
37
38 enum imx_mu_xsr {
39 IMX_MU_SR,
40 IMX_MU_GSR,
41 IMX_MU_TSR,
42 IMX_MU_RSR,
43 };
44
45 struct imx_sc_rpc_msg_max {
46 struct imx_sc_rpc_msg hdr;
47 u32 data[7];
48 };
49
50 struct imx_mu_con_priv {
51 unsigned int idx;
52 char irq_desc[IMX_MU_CHAN_NAME_SIZE];
53 enum imx_mu_chan_type type;
54 struct mbox_chan *chan;
55 struct tasklet_struct txdb_tasklet;
56 };
57
58 struct imx_mu_priv {
59 struct device *dev;
60 void __iomem *base;
61 spinlock_t xcr_lock; /* control register lock */
62
63 struct mbox_controller mbox;
64 struct mbox_chan mbox_chans[IMX_MU_CHANS];
65
66 struct imx_mu_con_priv con_priv[IMX_MU_CHANS];
67 const struct imx_mu_dcfg *dcfg;
68 struct clk *clk;
69 int irq;
70
71 u32 xcr[4];
72
73 bool side_b;
74 };
75
76 enum imx_mu_type {
77 IMX_MU_V1,
78 IMX_MU_V2,
79 };
80
81 struct imx_mu_dcfg {
82 int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
83 int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
84 void (*init)(struct imx_mu_priv *priv);
85 enum imx_mu_type type;
86 u32 xTR; /* Transmit Register0 */
87 u32 xRR; /* Receive Register0 */
88 u32 xSR[4]; /* Status Registers */
89 u32 xCR[4]; /* Control Registers */
90 };
91
92 #define IMX_MU_xSR_GIPn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
93 #define IMX_MU_xSR_RFn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
94 #define IMX_MU_xSR_TEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
95
96 /* General Purpose Interrupt Enable */
97 #define IMX_MU_xCR_GIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
98 /* Receive Interrupt Enable */
99 #define IMX_MU_xCR_RIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
100 /* Transmit Interrupt Enable */
101 #define IMX_MU_xCR_TIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
102 /* General Purpose Interrupt Request */
103 #define IMX_MU_xCR_GIRn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(16 + (3 - (x))))
104
105
to_imx_mu_priv(struct mbox_controller * mbox)106 static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
107 {
108 return container_of(mbox, struct imx_mu_priv, mbox);
109 }
110
imx_mu_write(struct imx_mu_priv * priv,u32 val,u32 offs)111 static void imx_mu_write(struct imx_mu_priv *priv, u32 val, u32 offs)
112 {
113 iowrite32(val, priv->base + offs);
114 }
115
imx_mu_read(struct imx_mu_priv * priv,u32 offs)116 static u32 imx_mu_read(struct imx_mu_priv *priv, u32 offs)
117 {
118 return ioread32(priv->base + offs);
119 }
120
imx_mu_xcr_rmw(struct imx_mu_priv * priv,enum imx_mu_xcr type,u32 set,u32 clr)121 static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, enum imx_mu_xcr type, u32 set, u32 clr)
122 {
123 unsigned long flags;
124 u32 val;
125
126 spin_lock_irqsave(&priv->xcr_lock, flags);
127 val = imx_mu_read(priv, priv->dcfg->xCR[type]);
128 val &= ~clr;
129 val |= set;
130 imx_mu_write(priv, val, priv->dcfg->xCR[type]);
131 spin_unlock_irqrestore(&priv->xcr_lock, flags);
132
133 return val;
134 }
135
imx_mu_generic_tx(struct imx_mu_priv * priv,struct imx_mu_con_priv * cp,void * data)136 static int imx_mu_generic_tx(struct imx_mu_priv *priv,
137 struct imx_mu_con_priv *cp,
138 void *data)
139 {
140 u32 *arg = data;
141
142 switch (cp->type) {
143 case IMX_MU_TYPE_TX:
144 imx_mu_write(priv, *arg, priv->dcfg->xTR + cp->idx * 4);
145 imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
146 break;
147 case IMX_MU_TYPE_TXDB:
148 imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
149 tasklet_schedule(&cp->txdb_tasklet);
150 break;
151 default:
152 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
153 return -EINVAL;
154 }
155
156 return 0;
157 }
158
imx_mu_generic_rx(struct imx_mu_priv * priv,struct imx_mu_con_priv * cp)159 static int imx_mu_generic_rx(struct imx_mu_priv *priv,
160 struct imx_mu_con_priv *cp)
161 {
162 u32 dat;
163
164 dat = imx_mu_read(priv, priv->dcfg->xRR + (cp->idx) * 4);
165 mbox_chan_received_data(cp->chan, (void *)&dat);
166
167 return 0;
168 }
169
imx_mu_scu_tx(struct imx_mu_priv * priv,struct imx_mu_con_priv * cp,void * data)170 static int imx_mu_scu_tx(struct imx_mu_priv *priv,
171 struct imx_mu_con_priv *cp,
172 void *data)
173 {
174 struct imx_sc_rpc_msg_max *msg = data;
175 u32 *arg = data;
176 int i, ret;
177 u32 xsr;
178
179 switch (cp->type) {
180 case IMX_MU_TYPE_TX:
181 /*
182 * msg->hdr.size specifies the number of u32 words while
183 * sizeof yields bytes.
184 */
185
186 if (msg->hdr.size > sizeof(*msg) / 4) {
187 /*
188 * The real message size can be different to
189 * struct imx_sc_rpc_msg_max size
190 */
191 dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on TX; got: %i bytes\n", sizeof(*msg), msg->hdr.size << 2);
192 return -EINVAL;
193 }
194
195 for (i = 0; i < 4 && i < msg->hdr.size; i++)
196 imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % 4) * 4);
197 for (; i < msg->hdr.size; i++) {
198 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_TSR],
199 xsr,
200 xsr & IMX_MU_xSR_TEn(priv->dcfg->type, i % 4),
201 0, 100);
202 if (ret) {
203 dev_err(priv->dev, "Send data index: %d timeout\n", i);
204 return ret;
205 }
206 imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % 4) * 4);
207 }
208
209 imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
210 break;
211 default:
212 dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
213 return -EINVAL;
214 }
215
216 return 0;
217 }
218
imx_mu_scu_rx(struct imx_mu_priv * priv,struct imx_mu_con_priv * cp)219 static int imx_mu_scu_rx(struct imx_mu_priv *priv,
220 struct imx_mu_con_priv *cp)
221 {
222 struct imx_sc_rpc_msg_max msg;
223 u32 *data = (u32 *)&msg;
224 int i, ret;
225 u32 xsr;
226
227 imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, 0));
228 *data++ = imx_mu_read(priv, priv->dcfg->xRR);
229
230 if (msg.hdr.size > sizeof(msg) / 4) {
231 dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on RX; got: %i bytes\n", sizeof(msg), msg.hdr.size << 2);
232 return -EINVAL;
233 }
234
235 for (i = 1; i < msg.hdr.size; i++) {
236 ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_RSR], xsr,
237 xsr & IMX_MU_xSR_RFn(priv->dcfg->type, i % 4), 0, 100);
238 if (ret) {
239 dev_err(priv->dev, "timeout read idx %d\n", i);
240 return ret;
241 }
242 *data++ = imx_mu_read(priv, priv->dcfg->xRR + (i % 4) * 4);
243 }
244
245 imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);
246 mbox_chan_received_data(cp->chan, (void *)&msg);
247
248 return 0;
249 }
250
imx_mu_txdb_tasklet(unsigned long data)251 static void imx_mu_txdb_tasklet(unsigned long data)
252 {
253 struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
254
255 mbox_chan_txdone(cp->chan, 0);
256 }
257
imx_mu_isr(int irq,void * p)258 static irqreturn_t imx_mu_isr(int irq, void *p)
259 {
260 struct mbox_chan *chan = p;
261 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
262 struct imx_mu_con_priv *cp = chan->con_priv;
263 u32 val, ctrl;
264
265 switch (cp->type) {
266 case IMX_MU_TYPE_TX:
267 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_TCR]);
268 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_TSR]);
269 val &= IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx) &
270 (ctrl & IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
271 break;
272 case IMX_MU_TYPE_RX:
273 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_RCR]);
274 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
275 val &= IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx) &
276 (ctrl & IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
277 break;
278 case IMX_MU_TYPE_RXDB:
279 ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_GIER]);
280 val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
281 val &= IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx) &
282 (ctrl & IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
283 break;
284 default:
285 dev_warn_ratelimited(priv->dev, "Unhandled channel type %d\n",
286 cp->type);
287 return IRQ_NONE;
288 }
289
290 if (!val)
291 return IRQ_NONE;
292
293 if ((val == IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx)) &&
294 (cp->type == IMX_MU_TYPE_TX)) {
295 imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
296 mbox_chan_txdone(chan, 0);
297 } else if ((val == IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx)) &&
298 (cp->type == IMX_MU_TYPE_RX)) {
299 priv->dcfg->rx(priv, cp);
300 } else if ((val == IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx)) &&
301 (cp->type == IMX_MU_TYPE_RXDB)) {
302 imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
303 priv->dcfg->xSR[IMX_MU_GSR]);
304 mbox_chan_received_data(chan, NULL);
305 } else {
306 dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
307 return IRQ_NONE;
308 }
309
310 return IRQ_HANDLED;
311 }
312
imx_mu_send_data(struct mbox_chan * chan,void * data)313 static int imx_mu_send_data(struct mbox_chan *chan, void *data)
314 {
315 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
316 struct imx_mu_con_priv *cp = chan->con_priv;
317
318 return priv->dcfg->tx(priv, cp, data);
319 }
320
imx_mu_startup(struct mbox_chan * chan)321 static int imx_mu_startup(struct mbox_chan *chan)
322 {
323 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
324 struct imx_mu_con_priv *cp = chan->con_priv;
325 unsigned long irq_flag = IRQF_SHARED;
326 int ret;
327
328 pm_runtime_get_sync(priv->dev);
329 if (cp->type == IMX_MU_TYPE_TXDB) {
330 /* Tx doorbell don't have ACK support */
331 tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet,
332 (unsigned long)cp);
333 return 0;
334 }
335
336 /* IPC MU should be with IRQF_NO_SUSPEND set */
337 if (!priv->dev->pm_domain)
338 irq_flag |= IRQF_NO_SUSPEND;
339
340 ret = request_irq(priv->irq, imx_mu_isr, irq_flag,
341 cp->irq_desc, chan);
342 if (ret) {
343 dev_err(priv->dev,
344 "Unable to acquire IRQ %d\n", priv->irq);
345 return ret;
346 }
347
348 switch (cp->type) {
349 case IMX_MU_TYPE_RX:
350 imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx), 0);
351 break;
352 case IMX_MU_TYPE_RXDB:
353 imx_mu_xcr_rmw(priv, IMX_MU_GIER, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx), 0);
354 break;
355 default:
356 break;
357 }
358
359 return 0;
360 }
361
imx_mu_shutdown(struct mbox_chan * chan)362 static void imx_mu_shutdown(struct mbox_chan *chan)
363 {
364 struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
365 struct imx_mu_con_priv *cp = chan->con_priv;
366
367 if (cp->type == IMX_MU_TYPE_TXDB) {
368 tasklet_kill(&cp->txdb_tasklet);
369 pm_runtime_put_sync(priv->dev);
370 return;
371 }
372
373 switch (cp->type) {
374 case IMX_MU_TYPE_TX:
375 imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
376 break;
377 case IMX_MU_TYPE_RX:
378 imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
379 break;
380 case IMX_MU_TYPE_RXDB:
381 imx_mu_xcr_rmw(priv, IMX_MU_GIER, 0, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
382 break;
383 default:
384 break;
385 }
386
387 free_irq(priv->irq, chan);
388 pm_runtime_put_sync(priv->dev);
389 }
390
391 static const struct mbox_chan_ops imx_mu_ops = {
392 .send_data = imx_mu_send_data,
393 .startup = imx_mu_startup,
394 .shutdown = imx_mu_shutdown,
395 };
396
imx_mu_scu_xlate(struct mbox_controller * mbox,const struct of_phandle_args * sp)397 static struct mbox_chan *imx_mu_scu_xlate(struct mbox_controller *mbox,
398 const struct of_phandle_args *sp)
399 {
400 u32 type, idx, chan;
401
402 if (sp->args_count != 2) {
403 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
404 return ERR_PTR(-EINVAL);
405 }
406
407 type = sp->args[0]; /* channel type */
408 idx = sp->args[1]; /* index */
409
410 switch (type) {
411 case IMX_MU_TYPE_TX:
412 case IMX_MU_TYPE_RX:
413 if (idx != 0)
414 dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
415 chan = type;
416 break;
417 case IMX_MU_TYPE_RXDB:
418 chan = 2 + idx;
419 break;
420 default:
421 dev_err(mbox->dev, "Invalid chan type: %d\n", type);
422 return ERR_PTR(-EINVAL);
423 }
424
425 if (chan >= mbox->num_chans) {
426 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
427 return ERR_PTR(-EINVAL);
428 }
429
430 return &mbox->chans[chan];
431 }
432
imx_mu_xlate(struct mbox_controller * mbox,const struct of_phandle_args * sp)433 static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
434 const struct of_phandle_args *sp)
435 {
436 u32 type, idx, chan;
437
438 if (sp->args_count != 2) {
439 dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
440 return ERR_PTR(-EINVAL);
441 }
442
443 type = sp->args[0]; /* channel type */
444 idx = sp->args[1]; /* index */
445 chan = type * 4 + idx;
446
447 if (chan >= mbox->num_chans) {
448 dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
449 return ERR_PTR(-EINVAL);
450 }
451
452 return &mbox->chans[chan];
453 }
454
imx_mu_init_generic(struct imx_mu_priv * priv)455 static void imx_mu_init_generic(struct imx_mu_priv *priv)
456 {
457 unsigned int i;
458
459 for (i = 0; i < IMX_MU_CHANS; i++) {
460 struct imx_mu_con_priv *cp = &priv->con_priv[i];
461
462 cp->idx = i % 4;
463 cp->type = i >> 2;
464 cp->chan = &priv->mbox_chans[i];
465 priv->mbox_chans[i].con_priv = cp;
466 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
467 "imx_mu_chan[%i-%i]", cp->type, cp->idx);
468 }
469
470 priv->mbox.num_chans = IMX_MU_CHANS;
471 priv->mbox.of_xlate = imx_mu_xlate;
472
473 if (priv->side_b)
474 return;
475
476 /* Set default MU configuration */
477 for (i = 0; i < IMX_MU_xCR_MAX; i++)
478 imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
479 }
480
imx_mu_init_scu(struct imx_mu_priv * priv)481 static void imx_mu_init_scu(struct imx_mu_priv *priv)
482 {
483 unsigned int i;
484
485 for (i = 0; i < IMX_MU_SCU_CHANS; i++) {
486 struct imx_mu_con_priv *cp = &priv->con_priv[i];
487
488 cp->idx = i < 2 ? 0 : i - 2;
489 cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
490 cp->chan = &priv->mbox_chans[i];
491 priv->mbox_chans[i].con_priv = cp;
492 snprintf(cp->irq_desc, sizeof(cp->irq_desc),
493 "imx_mu_chan[%i-%i]", cp->type, cp->idx);
494 }
495
496 priv->mbox.num_chans = IMX_MU_SCU_CHANS;
497 priv->mbox.of_xlate = imx_mu_scu_xlate;
498
499 /* Set default MU configuration */
500 for (i = 0; i < IMX_MU_xCR_MAX; i++)
501 imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
502 }
503
imx_mu_probe(struct platform_device * pdev)504 static int imx_mu_probe(struct platform_device *pdev)
505 {
506 struct device *dev = &pdev->dev;
507 struct device_node *np = dev->of_node;
508 struct imx_mu_priv *priv;
509 const struct imx_mu_dcfg *dcfg;
510 int ret;
511
512 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
513 if (!priv)
514 return -ENOMEM;
515
516 priv->dev = dev;
517
518 priv->base = devm_platform_ioremap_resource(pdev, 0);
519 if (IS_ERR(priv->base))
520 return PTR_ERR(priv->base);
521
522 priv->irq = platform_get_irq(pdev, 0);
523 if (priv->irq < 0)
524 return priv->irq;
525
526 dcfg = of_device_get_match_data(dev);
527 if (!dcfg)
528 return -EINVAL;
529 priv->dcfg = dcfg;
530
531 priv->clk = devm_clk_get(dev, NULL);
532 if (IS_ERR(priv->clk)) {
533 if (PTR_ERR(priv->clk) != -ENOENT)
534 return PTR_ERR(priv->clk);
535
536 priv->clk = NULL;
537 }
538
539 ret = clk_prepare_enable(priv->clk);
540 if (ret) {
541 dev_err(dev, "Failed to enable clock\n");
542 return ret;
543 }
544
545 priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
546
547 priv->dcfg->init(priv);
548
549 spin_lock_init(&priv->xcr_lock);
550
551 priv->mbox.dev = dev;
552 priv->mbox.ops = &imx_mu_ops;
553 priv->mbox.chans = priv->mbox_chans;
554 priv->mbox.txdone_irq = true;
555
556 platform_set_drvdata(pdev, priv);
557
558 ret = devm_mbox_controller_register(dev, &priv->mbox);
559 if (ret) {
560 clk_disable_unprepare(priv->clk);
561 return ret;
562 }
563
564 pm_runtime_enable(dev);
565
566 ret = pm_runtime_get_sync(dev);
567 if (ret < 0) {
568 pm_runtime_put_noidle(dev);
569 goto disable_runtime_pm;
570 }
571
572 ret = pm_runtime_put_sync(dev);
573 if (ret < 0)
574 goto disable_runtime_pm;
575
576 clk_disable_unprepare(priv->clk);
577
578 return 0;
579
580 disable_runtime_pm:
581 pm_runtime_disable(dev);
582 clk_disable_unprepare(priv->clk);
583 return ret;
584 }
585
imx_mu_remove(struct platform_device * pdev)586 static int imx_mu_remove(struct platform_device *pdev)
587 {
588 struct imx_mu_priv *priv = platform_get_drvdata(pdev);
589
590 pm_runtime_disable(priv->dev);
591
592 return 0;
593 }
594
595 static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
596 .tx = imx_mu_generic_tx,
597 .rx = imx_mu_generic_rx,
598 .init = imx_mu_init_generic,
599 .xTR = 0x0,
600 .xRR = 0x10,
601 .xSR = {0x20, 0x20, 0x20, 0x20},
602 .xCR = {0x24, 0x24, 0x24, 0x24},
603 };
604
605 static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
606 .tx = imx_mu_generic_tx,
607 .rx = imx_mu_generic_rx,
608 .init = imx_mu_init_generic,
609 .xTR = 0x20,
610 .xRR = 0x40,
611 .xSR = {0x60, 0x60, 0x60, 0x60},
612 .xCR = {0x64, 0x64, 0x64, 0x64},
613 };
614
615 static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
616 .tx = imx_mu_generic_tx,
617 .rx = imx_mu_generic_rx,
618 .init = imx_mu_init_generic,
619 .type = IMX_MU_V2,
620 .xTR = 0x200,
621 .xRR = 0x280,
622 .xSR = {0xC, 0x118, 0x124, 0x12C},
623 .xCR = {0x110, 0x114, 0x120, 0x128},
624 };
625
626 static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
627 .tx = imx_mu_scu_tx,
628 .rx = imx_mu_scu_rx,
629 .init = imx_mu_init_scu,
630 .xTR = 0x0,
631 .xRR = 0x10,
632 .xSR = {0x20, 0x20, 0x20, 0x20},
633 .xCR = {0x24, 0x24, 0x24, 0x24},
634 };
635
636 static const struct of_device_id imx_mu_dt_ids[] = {
637 { .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
638 { .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
639 { .compatible = "fsl,imx8ulp-mu", .data = &imx_mu_cfg_imx8ulp },
640 { .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
641 { },
642 };
643 MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
644
imx_mu_suspend_noirq(struct device * dev)645 static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
646 {
647 struct imx_mu_priv *priv = dev_get_drvdata(dev);
648 int i;
649
650 if (!priv->clk) {
651 for (i = 0; i < IMX_MU_xCR_MAX; i++)
652 priv->xcr[i] = imx_mu_read(priv, priv->dcfg->xCR[i]);
653 }
654
655 return 0;
656 }
657
imx_mu_resume_noirq(struct device * dev)658 static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
659 {
660 struct imx_mu_priv *priv = dev_get_drvdata(dev);
661 int i;
662
663 /*
664 * ONLY restore MU when context lost, the TIE could
665 * be set during noirq resume as there is MU data
666 * communication going on, and restore the saved
667 * value will overwrite the TIE and cause MU data
668 * send failed, may lead to system freeze. This issue
669 * is observed by testing freeze mode suspend.
670 */
671 if (!imx_mu_read(priv, priv->dcfg->xCR[0]) && !priv->clk) {
672 for (i = 0; i < IMX_MU_xCR_MAX; i++)
673 imx_mu_write(priv, priv->xcr[i], priv->dcfg->xCR[i]);
674 }
675
676 return 0;
677 }
678
imx_mu_runtime_suspend(struct device * dev)679 static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
680 {
681 struct imx_mu_priv *priv = dev_get_drvdata(dev);
682
683 clk_disable_unprepare(priv->clk);
684
685 return 0;
686 }
687
imx_mu_runtime_resume(struct device * dev)688 static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
689 {
690 struct imx_mu_priv *priv = dev_get_drvdata(dev);
691 int ret;
692
693 ret = clk_prepare_enable(priv->clk);
694 if (ret)
695 dev_err(dev, "failed to enable clock\n");
696
697 return ret;
698 }
699
700 static const struct dev_pm_ops imx_mu_pm_ops = {
701 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_mu_suspend_noirq,
702 imx_mu_resume_noirq)
703 SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
704 imx_mu_runtime_resume, NULL)
705 };
706
707 static struct platform_driver imx_mu_driver = {
708 .probe = imx_mu_probe,
709 .remove = imx_mu_remove,
710 .driver = {
711 .name = "imx_mu",
712 .of_match_table = imx_mu_dt_ids,
713 .pm = &imx_mu_pm_ops,
714 },
715 };
716 module_platform_driver(imx_mu_driver);
717
718 MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");
719 MODULE_DESCRIPTION("Message Unit driver for i.MX");
720 MODULE_LICENSE("GPL v2");
721
