1 // SPDX-License-Identifier: GPL-2.0-only
2 /* OMAP SSI driver.
3 *
4 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
5 * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
6 *
7 * Contact: Carlos Chinea <carlos.chinea@nokia.com>
8 */
9
10 #include <linux/compiler.h>
11 #include <linux/err.h>
12 #include <linux/ioport.h>
13 #include <linux/io.h>
14 #include <linux/clk.h>
15 #include <linux/device.h>
16 #include <linux/platform_device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/dmaengine.h>
19 #include <linux/delay.h>
20 #include <linux/hsi/ssi_protocol.h>
21 #include <linux/seq_file.h>
22 #include <linux/scatterlist.h>
23 #include <linux/interrupt.h>
24 #include <linux/spinlock.h>
25 #include <linux/debugfs.h>
26 #include <linux/pinctrl/consumer.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/of.h>
29 #include <linux/of_platform.h>
30 #include <linux/hsi/hsi.h>
31 #include <linux/idr.h>
32
33 #include "omap_ssi_regs.h"
34 #include "omap_ssi.h"
35
36 /* For automatically allocated device IDs */
37 static DEFINE_IDA(platform_omap_ssi_ida);
38
39 #ifdef CONFIG_DEBUG_FS
ssi_regs_show(struct seq_file * m,void * p __maybe_unused)40 static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused)
41 {
42 struct hsi_controller *ssi = m->private;
43 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
44 void __iomem *sys = omap_ssi->sys;
45
46 pm_runtime_get_sync(ssi->device.parent);
47 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG));
48 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG));
49 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG));
50 pm_runtime_put(ssi->device.parent);
51
52 return 0;
53 }
54
ssi_gdd_regs_show(struct seq_file * m,void * p __maybe_unused)55 static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused)
56 {
57 struct hsi_controller *ssi = m->private;
58 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
59 void __iomem *gdd = omap_ssi->gdd;
60 void __iomem *sys = omap_ssi->sys;
61 int lch;
62
63 pm_runtime_get_sync(ssi->device.parent);
64
65 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
66 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG));
67 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
68 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
69 seq_printf(m, "HW_ID\t\t: 0x%08x\n",
70 readl(gdd + SSI_GDD_HW_ID_REG));
71 seq_printf(m, "PPORT_ID\t: 0x%08x\n",
72 readl(gdd + SSI_GDD_PPORT_ID_REG));
73 seq_printf(m, "MPORT_ID\t: 0x%08x\n",
74 readl(gdd + SSI_GDD_MPORT_ID_REG));
75 seq_printf(m, "TEST\t\t: 0x%08x\n",
76 readl(gdd + SSI_GDD_TEST_REG));
77 seq_printf(m, "GCR\t\t: 0x%08x\n",
78 readl(gdd + SSI_GDD_GCR_REG));
79
80 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
81 seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
82 seq_printf(m, "CSDP\t\t: 0x%04x\n",
83 readw(gdd + SSI_GDD_CSDP_REG(lch)));
84 seq_printf(m, "CCR\t\t: 0x%04x\n",
85 readw(gdd + SSI_GDD_CCR_REG(lch)));
86 seq_printf(m, "CICR\t\t: 0x%04x\n",
87 readw(gdd + SSI_GDD_CICR_REG(lch)));
88 seq_printf(m, "CSR\t\t: 0x%04x\n",
89 readw(gdd + SSI_GDD_CSR_REG(lch)));
90 seq_printf(m, "CSSA\t\t: 0x%08x\n",
91 readl(gdd + SSI_GDD_CSSA_REG(lch)));
92 seq_printf(m, "CDSA\t\t: 0x%08x\n",
93 readl(gdd + SSI_GDD_CDSA_REG(lch)));
94 seq_printf(m, "CEN\t\t: 0x%04x\n",
95 readw(gdd + SSI_GDD_CEN_REG(lch)));
96 seq_printf(m, "CSAC\t\t: 0x%04x\n",
97 readw(gdd + SSI_GDD_CSAC_REG(lch)));
98 seq_printf(m, "CDAC\t\t: 0x%04x\n",
99 readw(gdd + SSI_GDD_CDAC_REG(lch)));
100 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
101 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
102 }
103
104 pm_runtime_put(ssi->device.parent);
105
106 return 0;
107 }
108
109 DEFINE_SHOW_ATTRIBUTE(ssi_regs);
110 DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs);
111
ssi_debug_add_ctrl(struct hsi_controller * ssi)112 static int ssi_debug_add_ctrl(struct hsi_controller *ssi)
113 {
114 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
115 struct dentry *dir;
116
117 /* SSI controller */
118 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
119 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, &ssi_regs_fops);
120
121 /* SSI GDD (DMA) */
122 dir = debugfs_create_dir("gdd", omap_ssi->dir);
123 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
124
125 return 0;
126 }
127
ssi_debug_remove_ctrl(struct hsi_controller * ssi)128 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
129 {
130 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
131
132 debugfs_remove_recursive(omap_ssi->dir);
133 }
134 #endif /* CONFIG_DEBUG_FS */
135
136 /*
137 * FIXME: Horrible HACK needed until we remove the useless wakeline test
138 * in the CMT. To be removed !!!!
139 */
ssi_waketest(struct hsi_client * cl,unsigned int enable)140 void ssi_waketest(struct hsi_client *cl, unsigned int enable)
141 {
142 struct hsi_port *port = hsi_get_port(cl);
143 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
144 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
145 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
146
147 omap_port->wktest = !!enable;
148 if (omap_port->wktest) {
149 pm_runtime_get_sync(ssi->device.parent);
150 writel_relaxed(SSI_WAKE(0),
151 omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
152 } else {
153 writel_relaxed(SSI_WAKE(0),
154 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
155 pm_runtime_put(ssi->device.parent);
156 }
157 }
158 EXPORT_SYMBOL_GPL(ssi_waketest);
159
ssi_gdd_complete(struct hsi_controller * ssi,unsigned int lch)160 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
161 {
162 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
163 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
164 struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
165 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
166 unsigned int dir;
167 u32 csr;
168 u32 val;
169
170 spin_lock(&omap_ssi->lock);
171
172 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
173 val &= ~SSI_GDD_LCH(lch);
174 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
175
176 if (msg->ttype == HSI_MSG_READ) {
177 dir = DMA_FROM_DEVICE;
178 val = SSI_DATAAVAILABLE(msg->channel);
179 pm_runtime_put(omap_port->pdev);
180 } else {
181 dir = DMA_TO_DEVICE;
182 val = SSI_DATAACCEPT(msg->channel);
183 /* Keep clocks reference for write pio event */
184 }
185 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
186 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
187 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */
188 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n",
189 msg->channel, msg->ttype);
190 spin_unlock(&omap_ssi->lock);
191 if (csr & SSI_CSR_TOUR) { /* Timeout error */
192 msg->status = HSI_STATUS_ERROR;
193 msg->actual_len = 0;
194 spin_lock(&omap_port->lock);
195 list_del(&msg->link); /* Dequeue msg */
196 spin_unlock(&omap_port->lock);
197
198 list_add_tail(&msg->link, &omap_port->errqueue);
199 schedule_delayed_work(&omap_port->errqueue_work, 0);
200 return;
201 }
202 spin_lock(&omap_port->lock);
203 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
204 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
205 spin_unlock(&omap_port->lock);
206
207 msg->status = HSI_STATUS_COMPLETED;
208 msg->actual_len = sg_dma_len(msg->sgt.sgl);
209 }
210
ssi_gdd_tasklet(unsigned long dev)211 static void ssi_gdd_tasklet(unsigned long dev)
212 {
213 struct hsi_controller *ssi = (struct hsi_controller *)dev;
214 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
215 void __iomem *sys = omap_ssi->sys;
216 unsigned int lch;
217 u32 status_reg;
218
219 pm_runtime_get(ssi->device.parent);
220
221 if (!pm_runtime_active(ssi->device.parent)) {
222 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n");
223 pm_runtime_put(ssi->device.parent);
224 return;
225 }
226
227 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
228 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
229 if (status_reg & SSI_GDD_LCH(lch))
230 ssi_gdd_complete(ssi, lch);
231 }
232 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
233 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
234
235 pm_runtime_put(ssi->device.parent);
236
237 if (status_reg)
238 tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
239 else
240 enable_irq(omap_ssi->gdd_irq);
241
242 }
243
ssi_gdd_isr(int irq,void * ssi)244 static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
245 {
246 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
247
248 tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
249 disable_irq_nosync(irq);
250
251 return IRQ_HANDLED;
252 }
253
ssi_get_clk_rate(struct hsi_controller * ssi)254 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi)
255 {
256 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
257 unsigned long rate = clk_get_rate(omap_ssi->fck);
258 return rate;
259 }
260
ssi_clk_event(struct notifier_block * nb,unsigned long event,void * data)261 static int ssi_clk_event(struct notifier_block *nb, unsigned long event,
262 void *data)
263 {
264 struct omap_ssi_controller *omap_ssi = container_of(nb,
265 struct omap_ssi_controller, fck_nb);
266 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev);
267 struct clk_notifier_data *clk_data = data;
268 struct omap_ssi_port *omap_port;
269 int i;
270
271 switch (event) {
272 case PRE_RATE_CHANGE:
273 dev_dbg(&ssi->device, "pre rate change\n");
274
275 for (i = 0; i < ssi->num_ports; i++) {
276 omap_port = omap_ssi->port[i];
277
278 if (!omap_port)
279 continue;
280
281 /* Workaround for SWBREAK + CAwake down race in CMT */
282 disable_irq(omap_port->wake_irq);
283
284 /* stop all ssi communication */
285 pinctrl_pm_select_idle_state(omap_port->pdev);
286 udelay(1); /* wait for racing frames */
287 }
288
289 break;
290 case ABORT_RATE_CHANGE:
291 dev_dbg(&ssi->device, "abort rate change\n");
292 fallthrough;
293 case POST_RATE_CHANGE:
294 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n",
295 clk_data->old_rate, clk_data->new_rate);
296 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */
297
298 for (i = 0; i < ssi->num_ports; i++) {
299 omap_port = omap_ssi->port[i];
300
301 if (!omap_port)
302 continue;
303
304 omap_ssi_port_update_fclk(ssi, omap_port);
305
306 /* resume ssi communication */
307 pinctrl_pm_select_default_state(omap_port->pdev);
308 enable_irq(omap_port->wake_irq);
309 }
310
311 break;
312 default:
313 break;
314 }
315
316 return NOTIFY_DONE;
317 }
318
ssi_get_iomem(struct platform_device * pd,const char * name,void __iomem ** pbase,dma_addr_t * phy)319 static int ssi_get_iomem(struct platform_device *pd,
320 const char *name, void __iomem **pbase, dma_addr_t *phy)
321 {
322 struct resource *mem;
323 void __iomem *base;
324 struct hsi_controller *ssi = platform_get_drvdata(pd);
325
326 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
327 base = devm_ioremap_resource(&ssi->device, mem);
328 if (IS_ERR(base))
329 return PTR_ERR(base);
330
331 *pbase = base;
332
333 if (phy)
334 *phy = mem->start;
335
336 return 0;
337 }
338
ssi_add_controller(struct hsi_controller * ssi,struct platform_device * pd)339 static int ssi_add_controller(struct hsi_controller *ssi,
340 struct platform_device *pd)
341 {
342 struct omap_ssi_controller *omap_ssi;
343 int err;
344
345 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL);
346 if (!omap_ssi)
347 return -ENOMEM;
348
349 err = ida_alloc(&platform_omap_ssi_ida, GFP_KERNEL);
350 if (err < 0)
351 return err;
352 ssi->id = err;
353
354 ssi->owner = THIS_MODULE;
355 ssi->device.parent = &pd->dev;
356 dev_set_name(&ssi->device, "ssi%d", ssi->id);
357 hsi_controller_set_drvdata(ssi, omap_ssi);
358 omap_ssi->dev = &ssi->device;
359 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL);
360 if (err < 0)
361 goto out_err;
362 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL);
363 if (err < 0)
364 goto out_err;
365 err = platform_get_irq_byname(pd, "gdd_mpu");
366 if (err < 0)
367 goto out_err;
368 omap_ssi->gdd_irq = err;
369 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
370 (unsigned long)ssi);
371 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr,
372 0, "gdd_mpu", ssi);
373 if (err < 0) {
374 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
375 omap_ssi->gdd_irq, err);
376 goto out_err;
377 }
378
379 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports,
380 sizeof(*omap_ssi->port), GFP_KERNEL);
381 if (!omap_ssi->port) {
382 err = -ENOMEM;
383 goto out_err;
384 }
385
386 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck");
387 if (IS_ERR(omap_ssi->fck)) {
388 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n",
389 PTR_ERR(omap_ssi->fck));
390 err = -ENODEV;
391 goto out_err;
392 }
393
394 omap_ssi->fck_nb.notifier_call = ssi_clk_event;
395 omap_ssi->fck_nb.priority = INT_MAX;
396 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb);
397
398 /* TODO: find register, which can be used to detect context loss */
399 omap_ssi->get_loss = NULL;
400
401 omap_ssi->max_speed = UINT_MAX;
402 spin_lock_init(&omap_ssi->lock);
403 err = hsi_register_controller(ssi);
404
405 if (err < 0)
406 goto out_err;
407
408 return 0;
409
410 out_err:
411 ida_free(&platform_omap_ssi_ida, ssi->id);
412 return err;
413 }
414
ssi_hw_init(struct hsi_controller * ssi)415 static int ssi_hw_init(struct hsi_controller *ssi)
416 {
417 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
418 int err;
419
420 err = pm_runtime_resume_and_get(ssi->device.parent);
421 if (err < 0) {
422 dev_err(&ssi->device, "runtime PM failed %d\n", err);
423 return err;
424 }
425 /* Resetting GDD */
426 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
427 /* Get FCK rate in kHz */
428 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000);
429 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate);
430
431 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
432 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
433 pm_runtime_put_sync(ssi->device.parent);
434
435 return 0;
436 }
437
ssi_remove_controller(struct hsi_controller * ssi)438 static void ssi_remove_controller(struct hsi_controller *ssi)
439 {
440 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
441 int id = ssi->id;
442 tasklet_kill(&omap_ssi->gdd_tasklet);
443 hsi_unregister_controller(ssi);
444 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb);
445 ida_free(&platform_omap_ssi_ida, id);
446 }
447
ssi_of_get_available_ports_count(const struct device_node * np)448 static inline int ssi_of_get_available_ports_count(const struct device_node *np)
449 {
450 struct device_node *child;
451 int num = 0;
452
453 for_each_available_child_of_node(np, child)
454 if (of_device_is_compatible(child, "ti,omap3-ssi-port"))
455 num++;
456
457 return num;
458 }
459
ssi_remove_ports(struct device * dev,void * c)460 static int ssi_remove_ports(struct device *dev, void *c)
461 {
462 struct platform_device *pdev = to_platform_device(dev);
463
464 if (!dev->of_node)
465 return 0;
466
467 of_node_clear_flag(dev->of_node, OF_POPULATED);
468 of_device_unregister(pdev);
469
470 return 0;
471 }
472
ssi_probe(struct platform_device * pd)473 static int ssi_probe(struct platform_device *pd)
474 {
475 struct platform_device *childpdev;
476 struct device_node *np = pd->dev.of_node;
477 struct device_node *child;
478 struct hsi_controller *ssi;
479 int err;
480 int num_ports;
481
482 if (!np) {
483 dev_err(&pd->dev, "missing device tree data\n");
484 return -EINVAL;
485 }
486
487 num_ports = ssi_of_get_available_ports_count(np);
488
489 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL);
490 if (!ssi) {
491 dev_err(&pd->dev, "No memory for controller\n");
492 return -ENOMEM;
493 }
494
495 platform_set_drvdata(pd, ssi);
496
497 err = ssi_add_controller(ssi, pd);
498 if (err < 0) {
499 hsi_put_controller(ssi);
500 goto out1;
501 }
502
503 pm_runtime_enable(&pd->dev);
504
505 err = ssi_hw_init(ssi);
506 if (err < 0)
507 goto out2;
508 #ifdef CONFIG_DEBUG_FS
509 err = ssi_debug_add_ctrl(ssi);
510 if (err < 0)
511 goto out2;
512 #endif
513
514 for_each_available_child_of_node(np, child) {
515 if (!of_device_is_compatible(child, "ti,omap3-ssi-port"))
516 continue;
517
518 childpdev = of_platform_device_create(child, NULL, &pd->dev);
519 if (!childpdev) {
520 err = -ENODEV;
521 dev_err(&pd->dev, "failed to create ssi controller port\n");
522 of_node_put(child);
523 goto out3;
524 }
525 }
526
527 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n",
528 ssi->id, num_ports);
529 return err;
530 out3:
531 device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
532 out2:
533 ssi_remove_controller(ssi);
534 pm_runtime_disable(&pd->dev);
535 out1:
536 platform_set_drvdata(pd, NULL);
537
538 return err;
539 }
540
ssi_remove(struct platform_device * pd)541 static void ssi_remove(struct platform_device *pd)
542 {
543 struct hsi_controller *ssi = platform_get_drvdata(pd);
544
545 /* cleanup of of_platform_populate() call */
546 device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
547
548 #ifdef CONFIG_DEBUG_FS
549 ssi_debug_remove_ctrl(ssi);
550 #endif
551 ssi_remove_controller(ssi);
552 platform_set_drvdata(pd, NULL);
553
554 pm_runtime_disable(&pd->dev);
555 }
556
557 #ifdef CONFIG_PM
omap_ssi_runtime_suspend(struct device * dev)558 static int omap_ssi_runtime_suspend(struct device *dev)
559 {
560 struct hsi_controller *ssi = dev_get_drvdata(dev);
561 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
562
563 dev_dbg(dev, "runtime suspend!\n");
564
565 if (omap_ssi->get_loss)
566 omap_ssi->loss_count =
567 omap_ssi->get_loss(ssi->device.parent);
568
569 return 0;
570 }
571
omap_ssi_runtime_resume(struct device * dev)572 static int omap_ssi_runtime_resume(struct device *dev)
573 {
574 struct hsi_controller *ssi = dev_get_drvdata(dev);
575 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
576
577 dev_dbg(dev, "runtime resume!\n");
578
579 if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
580 omap_ssi->get_loss(ssi->device.parent)))
581 return 0;
582
583 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);
584
585 return 0;
586 }
587
588 static const struct dev_pm_ops omap_ssi_pm_ops = {
589 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume,
590 NULL)
591 };
592
593 #define DEV_PM_OPS (&omap_ssi_pm_ops)
594 #else
595 #define DEV_PM_OPS NULL
596 #endif
597
598 #ifdef CONFIG_OF
599 static const struct of_device_id omap_ssi_of_match[] = {
600 { .compatible = "ti,omap3-ssi", },
601 {},
602 };
603 MODULE_DEVICE_TABLE(of, omap_ssi_of_match);
604 #else
605 #define omap_ssi_of_match NULL
606 #endif
607
608 static struct platform_driver ssi_pdriver = {
609 .probe = ssi_probe,
610 .remove = ssi_remove,
611 .driver = {
612 .name = "omap_ssi",
613 .pm = DEV_PM_OPS,
614 .of_match_table = omap_ssi_of_match,
615 },
616 };
617
ssi_init(void)618 static int __init ssi_init(void) {
619 int ret;
620
621 ret = platform_driver_register(&ssi_pdriver);
622 if (ret)
623 return ret;
624
625 ret = platform_driver_register(&ssi_port_pdriver);
626 if (ret) {
627 platform_driver_unregister(&ssi_pdriver);
628 return ret;
629 }
630
631 return 0;
632 }
633 module_init(ssi_init);
634
ssi_exit(void)635 static void __exit ssi_exit(void) {
636 platform_driver_unregister(&ssi_port_pdriver);
637 platform_driver_unregister(&ssi_pdriver);
638 }
639 module_exit(ssi_exit);
640
641 MODULE_ALIAS("platform:omap_ssi");
642 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
643 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
644 MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
645 MODULE_LICENSE("GPL v2");
646