1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#include <linux/compiler.h>
24#include <linux/err.h>
25#include <linux/ioport.h>
26#include <linux/io.h>
27#include <linux/clk.h>
28#include <linux/device.h>
29#include <linux/platform_device.h>
30#include <linux/dma-mapping.h>
31#include <linux/dmaengine.h>
32#include <linux/delay.h>
33#include <linux/seq_file.h>
34#include <linux/scatterlist.h>
35#include <linux/interrupt.h>
36#include <linux/spinlock.h>
37#include <linux/debugfs.h>
38#include <linux/pinctrl/consumer.h>
39#include <linux/pm_runtime.h>
40#include <linux/of_platform.h>
41#include <linux/hsi/hsi.h>
42#include <linux/idr.h>
43
44#include "omap_ssi_regs.h"
45#include "omap_ssi.h"
46
47
48static DEFINE_IDA(platform_omap_ssi_ida);
49
50#ifdef CONFIG_DEBUG_FS
51static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused)
52{
53 struct hsi_controller *ssi = m->private;
54 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
55 void __iomem *sys = omap_ssi->sys;
56
57 pm_runtime_get_sync(ssi->device.parent);
58 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG));
59 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG));
60 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG));
61 pm_runtime_put(ssi->device.parent);
62
63 return 0;
64}
65
66static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused)
67{
68 struct hsi_controller *ssi = m->private;
69 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
70 void __iomem *gdd = omap_ssi->gdd;
71 void __iomem *sys = omap_ssi->sys;
72 int lch;
73
74 pm_runtime_get_sync(ssi->device.parent);
75
76 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
77 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG));
78 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
79 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
80 seq_printf(m, "HW_ID\t\t: 0x%08x\n",
81 readl(gdd + SSI_GDD_HW_ID_REG));
82 seq_printf(m, "PPORT_ID\t: 0x%08x\n",
83 readl(gdd + SSI_GDD_PPORT_ID_REG));
84 seq_printf(m, "MPORT_ID\t: 0x%08x\n",
85 readl(gdd + SSI_GDD_MPORT_ID_REG));
86 seq_printf(m, "TEST\t\t: 0x%08x\n",
87 readl(gdd + SSI_GDD_TEST_REG));
88 seq_printf(m, "GCR\t\t: 0x%08x\n",
89 readl(gdd + SSI_GDD_GCR_REG));
90
91 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
92 seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
93 seq_printf(m, "CSDP\t\t: 0x%04x\n",
94 readw(gdd + SSI_GDD_CSDP_REG(lch)));
95 seq_printf(m, "CCR\t\t: 0x%04x\n",
96 readw(gdd + SSI_GDD_CCR_REG(lch)));
97 seq_printf(m, "CICR\t\t: 0x%04x\n",
98 readw(gdd + SSI_GDD_CICR_REG(lch)));
99 seq_printf(m, "CSR\t\t: 0x%04x\n",
100 readw(gdd + SSI_GDD_CSR_REG(lch)));
101 seq_printf(m, "CSSA\t\t: 0x%08x\n",
102 readl(gdd + SSI_GDD_CSSA_REG(lch)));
103 seq_printf(m, "CDSA\t\t: 0x%08x\n",
104 readl(gdd + SSI_GDD_CDSA_REG(lch)));
105 seq_printf(m, "CEN\t\t: 0x%04x\n",
106 readw(gdd + SSI_GDD_CEN_REG(lch)));
107 seq_printf(m, "CSAC\t\t: 0x%04x\n",
108 readw(gdd + SSI_GDD_CSAC_REG(lch)));
109 seq_printf(m, "CDAC\t\t: 0x%04x\n",
110 readw(gdd + SSI_GDD_CDAC_REG(lch)));
111 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
112 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
113 }
114
115 pm_runtime_put(ssi->device.parent);
116
117 return 0;
118}
119
120static int ssi_regs_open(struct inode *inode, struct file *file)
121{
122 return single_open(file, ssi_debug_show, inode->i_private);
123}
124
125static int ssi_gdd_regs_open(struct inode *inode, struct file *file)
126{
127 return single_open(file, ssi_debug_gdd_show, inode->i_private);
128}
129
130static const struct file_operations ssi_regs_fops = {
131 .open = ssi_regs_open,
132 .read = seq_read,
133 .llseek = seq_lseek,
134 .release = single_release,
135};
136
137static const struct file_operations ssi_gdd_regs_fops = {
138 .open = ssi_gdd_regs_open,
139 .read = seq_read,
140 .llseek = seq_lseek,
141 .release = single_release,
142};
143
144static int ssi_debug_add_ctrl(struct hsi_controller *ssi)
145{
146 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
147 struct dentry *dir;
148
149
150 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
151 if (!omap_ssi->dir)
152 return -ENOMEM;
153
154 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
155 &ssi_regs_fops);
156
157 dir = debugfs_create_dir("gdd", omap_ssi->dir);
158 if (!dir)
159 goto rback;
160 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
161
162 return 0;
163rback:
164 debugfs_remove_recursive(omap_ssi->dir);
165
166 return -ENOMEM;
167}
168
169static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
170{
171 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
172
173 debugfs_remove_recursive(omap_ssi->dir);
174}
175#endif
176
177
178
179
180
181void ssi_waketest(struct hsi_client *cl, unsigned int enable)
182{
183 struct hsi_port *port = hsi_get_port(cl);
184 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
185 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
186 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
187
188 omap_port->wktest = !!enable;
189 if (omap_port->wktest) {
190 pm_runtime_get_sync(ssi->device.parent);
191 writel_relaxed(SSI_WAKE(0),
192 omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
193 } else {
194 writel_relaxed(SSI_WAKE(0),
195 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
196 pm_runtime_put(ssi->device.parent);
197 }
198}
199EXPORT_SYMBOL_GPL(ssi_waketest);
200
201static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
202{
203 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
204 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
205 struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
206 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
207 unsigned int dir;
208 u32 csr;
209 u32 val;
210
211 spin_lock(&omap_ssi->lock);
212
213 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
214 val &= ~SSI_GDD_LCH(lch);
215 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
216
217 if (msg->ttype == HSI_MSG_READ) {
218 dir = DMA_FROM_DEVICE;
219 val = SSI_DATAAVAILABLE(msg->channel);
220 pm_runtime_put(omap_port->pdev);
221 } else {
222 dir = DMA_TO_DEVICE;
223 val = SSI_DATAACCEPT(msg->channel);
224
225 }
226 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
227 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
228 omap_ssi->gdd_trn[lch].msg = NULL;
229 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n",
230 msg->channel, msg->ttype);
231 spin_unlock(&omap_ssi->lock);
232 if (csr & SSI_CSR_TOUR) {
233 msg->status = HSI_STATUS_ERROR;
234 msg->actual_len = 0;
235 spin_lock(&omap_port->lock);
236 list_del(&msg->link);
237 spin_unlock(&omap_port->lock);
238
239 list_add_tail(&msg->link, &omap_port->errqueue);
240 schedule_delayed_work(&omap_port->errqueue_work, 0);
241 return;
242 }
243 spin_lock(&omap_port->lock);
244 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
245 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
246 spin_unlock(&omap_port->lock);
247
248 msg->status = HSI_STATUS_COMPLETED;
249 msg->actual_len = sg_dma_len(msg->sgt.sgl);
250}
251
252static void ssi_gdd_tasklet(unsigned long dev)
253{
254 struct hsi_controller *ssi = (struct hsi_controller *)dev;
255 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
256 void __iomem *sys = omap_ssi->sys;
257 unsigned int lch;
258 u32 status_reg;
259
260 pm_runtime_get(ssi->device.parent);
261
262 if (!pm_runtime_active(ssi->device.parent)) {
263 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n");
264 pm_runtime_put(ssi->device.parent);
265 return;
266 }
267
268 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
269 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
270 if (status_reg & SSI_GDD_LCH(lch))
271 ssi_gdd_complete(ssi, lch);
272 }
273 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
274 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
275
276 pm_runtime_put(ssi->device.parent);
277
278 if (status_reg)
279 tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
280 else
281 enable_irq(omap_ssi->gdd_irq);
282
283}
284
285static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
286{
287 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
288
289 tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
290 disable_irq_nosync(irq);
291
292 return IRQ_HANDLED;
293}
294
295static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi)
296{
297 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
298 unsigned long rate = clk_get_rate(omap_ssi->fck);
299 return rate;
300}
301
302static int ssi_clk_event(struct notifier_block *nb, unsigned long event,
303 void *data)
304{
305 struct omap_ssi_controller *omap_ssi = container_of(nb,
306 struct omap_ssi_controller, fck_nb);
307 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev);
308 struct clk_notifier_data *clk_data = data;
309 struct omap_ssi_port *omap_port;
310 int i;
311
312 switch (event) {
313 case PRE_RATE_CHANGE:
314 dev_dbg(&ssi->device, "pre rate change\n");
315
316 for (i = 0; i < ssi->num_ports; i++) {
317 omap_port = omap_ssi->port[i];
318
319 if (!omap_port)
320 continue;
321
322
323 disable_irq(omap_port->wake_irq);
324
325
326 pinctrl_pm_select_idle_state(omap_port->pdev);
327 udelay(1);
328 }
329
330 break;
331 case ABORT_RATE_CHANGE:
332 dev_dbg(&ssi->device, "abort rate change\n");
333
334 case POST_RATE_CHANGE:
335 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n",
336 clk_data->old_rate, clk_data->new_rate);
337 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000);
338
339 for (i = 0; i < ssi->num_ports; i++) {
340 omap_port = omap_ssi->port[i];
341
342 if (!omap_port)
343 continue;
344
345 omap_ssi_port_update_fclk(ssi, omap_port);
346
347
348 pinctrl_pm_select_default_state(omap_port->pdev);
349 enable_irq(omap_port->wake_irq);
350 }
351
352 break;
353 default:
354 break;
355 }
356
357 return NOTIFY_DONE;
358}
359
360static int ssi_get_iomem(struct platform_device *pd,
361 const char *name, void __iomem **pbase, dma_addr_t *phy)
362{
363 struct resource *mem;
364 void __iomem *base;
365 struct hsi_controller *ssi = platform_get_drvdata(pd);
366
367 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
368 base = devm_ioremap_resource(&ssi->device, mem);
369 if (IS_ERR(base))
370 return PTR_ERR(base);
371
372 *pbase = base;
373
374 if (phy)
375 *phy = mem->start;
376
377 return 0;
378}
379
380static int ssi_add_controller(struct hsi_controller *ssi,
381 struct platform_device *pd)
382{
383 struct omap_ssi_controller *omap_ssi;
384 int err;
385
386 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL);
387 if (!omap_ssi) {
388 dev_err(&pd->dev, "not enough memory for omap ssi\n");
389 return -ENOMEM;
390 }
391
392 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL);
393 if (err < 0)
394 goto out_err;
395 ssi->id = err;
396
397 ssi->owner = THIS_MODULE;
398 ssi->device.parent = &pd->dev;
399 dev_set_name(&ssi->device, "ssi%d", ssi->id);
400 hsi_controller_set_drvdata(ssi, omap_ssi);
401 omap_ssi->dev = &ssi->device;
402 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL);
403 if (err < 0)
404 goto out_err;
405 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL);
406 if (err < 0)
407 goto out_err;
408 err = platform_get_irq_byname(pd, "gdd_mpu");
409 if (err < 0) {
410 dev_err(&pd->dev, "GDD IRQ resource missing\n");
411 goto out_err;
412 }
413 omap_ssi->gdd_irq = err;
414 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
415 (unsigned long)ssi);
416 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr,
417 0, "gdd_mpu", ssi);
418 if (err < 0) {
419 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
420 omap_ssi->gdd_irq, err);
421 goto out_err;
422 }
423
424 omap_ssi->port = devm_kzalloc(&ssi->device,
425 sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL);
426 if (!omap_ssi->port) {
427 err = -ENOMEM;
428 goto out_err;
429 }
430
431 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck");
432 if (IS_ERR(omap_ssi->fck)) {
433 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n",
434 PTR_ERR(omap_ssi->fck));
435 err = -ENODEV;
436 goto out_err;
437 }
438
439 omap_ssi->fck_nb.notifier_call = ssi_clk_event;
440 omap_ssi->fck_nb.priority = INT_MAX;
441 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb);
442
443
444 omap_ssi->get_loss = NULL;
445
446 omap_ssi->max_speed = UINT_MAX;
447 spin_lock_init(&omap_ssi->lock);
448 err = hsi_register_controller(ssi);
449
450 if (err < 0)
451 goto out_err;
452
453 return 0;
454
455out_err:
456 ida_simple_remove(&platform_omap_ssi_ida, ssi->id);
457 return err;
458}
459
460static int ssi_hw_init(struct hsi_controller *ssi)
461{
462 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
463 int err;
464
465 err = pm_runtime_get_sync(ssi->device.parent);
466 if (err < 0) {
467 dev_err(&ssi->device, "runtime PM failed %d\n", err);
468 return err;
469 }
470
471 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
472
473 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000);
474 dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate);
475
476 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
477 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
478 pm_runtime_put_sync(ssi->device.parent);
479
480 return 0;
481}
482
483static void ssi_remove_controller(struct hsi_controller *ssi)
484{
485 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
486 int id = ssi->id;
487 tasklet_kill(&omap_ssi->gdd_tasklet);
488 hsi_unregister_controller(ssi);
489 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb);
490 ida_simple_remove(&platform_omap_ssi_ida, id);
491}
492
493static inline int ssi_of_get_available_ports_count(const struct device_node *np)
494{
495 struct device_node *child;
496 int num = 0;
497
498 for_each_available_child_of_node(np, child)
499 if (of_device_is_compatible(child, "ti,omap3-ssi-port"))
500 num++;
501
502 return num;
503}
504
505static int ssi_remove_ports(struct device *dev, void *c)
506{
507 struct platform_device *pdev = to_platform_device(dev);
508
509 if (!dev->of_node)
510 return 0;
511
512 of_node_clear_flag(dev->of_node, OF_POPULATED);
513 of_device_unregister(pdev);
514
515 return 0;
516}
517
518static int ssi_probe(struct platform_device *pd)
519{
520 struct platform_device *childpdev;
521 struct device_node *np = pd->dev.of_node;
522 struct device_node *child;
523 struct hsi_controller *ssi;
524 int err;
525 int num_ports;
526
527 if (!np) {
528 dev_err(&pd->dev, "missing device tree data\n");
529 return -EINVAL;
530 }
531
532 num_ports = ssi_of_get_available_ports_count(np);
533
534 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL);
535 if (!ssi) {
536 dev_err(&pd->dev, "No memory for controller\n");
537 return -ENOMEM;
538 }
539
540 platform_set_drvdata(pd, ssi);
541
542 err = ssi_add_controller(ssi, pd);
543 if (err < 0)
544 goto out1;
545
546 pm_runtime_enable(&pd->dev);
547
548 err = ssi_hw_init(ssi);
549 if (err < 0)
550 goto out2;
551#ifdef CONFIG_DEBUG_FS
552 err = ssi_debug_add_ctrl(ssi);
553 if (err < 0)
554 goto out2;
555#endif
556
557 for_each_available_child_of_node(np, child) {
558 if (!of_device_is_compatible(child, "ti,omap3-ssi-port"))
559 continue;
560
561 childpdev = of_platform_device_create(child, NULL, &pd->dev);
562 if (!childpdev) {
563 err = -ENODEV;
564 dev_err(&pd->dev, "failed to create ssi controller port\n");
565 goto out3;
566 }
567 }
568
569 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n",
570 ssi->id, num_ports);
571 return err;
572out3:
573 device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
574out2:
575 ssi_remove_controller(ssi);
576out1:
577 platform_set_drvdata(pd, NULL);
578 pm_runtime_disable(&pd->dev);
579
580 return err;
581}
582
583static int ssi_remove(struct platform_device *pd)
584{
585 struct hsi_controller *ssi = platform_get_drvdata(pd);
586
587
588 device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
589
590#ifdef CONFIG_DEBUG_FS
591 ssi_debug_remove_ctrl(ssi);
592#endif
593 ssi_remove_controller(ssi);
594 platform_set_drvdata(pd, NULL);
595
596 pm_runtime_disable(&pd->dev);
597
598 return 0;
599}
600
601#ifdef CONFIG_PM
602static int omap_ssi_runtime_suspend(struct device *dev)
603{
604 struct hsi_controller *ssi = dev_get_drvdata(dev);
605 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
606
607 dev_dbg(dev, "runtime suspend!\n");
608
609 if (omap_ssi->get_loss)
610 omap_ssi->loss_count =
611 omap_ssi->get_loss(ssi->device.parent);
612
613 return 0;
614}
615
616static int omap_ssi_runtime_resume(struct device *dev)
617{
618 struct hsi_controller *ssi = dev_get_drvdata(dev);
619 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
620
621 dev_dbg(dev, "runtime resume!\n");
622
623 if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
624 omap_ssi->get_loss(ssi->device.parent)))
625 return 0;
626
627 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);
628
629 return 0;
630}
631
632static const struct dev_pm_ops omap_ssi_pm_ops = {
633 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume,
634 NULL)
635};
636
637#define DEV_PM_OPS (&omap_ssi_pm_ops)
638#else
639#define DEV_PM_OPS NULL
640#endif
641
642#ifdef CONFIG_OF
643static const struct of_device_id omap_ssi_of_match[] = {
644 { .compatible = "ti,omap3-ssi", },
645 {},
646};
647MODULE_DEVICE_TABLE(of, omap_ssi_of_match);
648#else
649#define omap_ssi_of_match NULL
650#endif
651
652static struct platform_driver ssi_pdriver = {
653 .probe = ssi_probe,
654 .remove = ssi_remove,
655 .driver = {
656 .name = "omap_ssi",
657 .pm = DEV_PM_OPS,
658 .of_match_table = omap_ssi_of_match,
659 },
660};
661
662static int __init ssi_init(void) {
663 int ret;
664
665 ret = platform_driver_register(&ssi_pdriver);
666 if (ret)
667 return ret;
668
669 return platform_driver_register(&ssi_port_pdriver);
670}
671module_init(ssi_init);
672
673static void __exit ssi_exit(void) {
674 platform_driver_unregister(&ssi_port_pdriver);
675 platform_driver_unregister(&ssi_pdriver);
676}
677module_exit(ssi_exit);
678
679MODULE_ALIAS("platform:omap_ssi");
680MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
681MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
682MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
683MODULE_LICENSE("GPL v2");
684
