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-rw-r--r--arch/arm/mach-pxa/ssp.c510
1 files changed, 0 insertions, 510 deletions
diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c
deleted file mode 100644
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--- a/arch/arm/mach-pxa/ssp.c
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1/*
2 * linux/arch/arm/mach-pxa/ssp.c
3 *
4 * based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
5 *
6 * Copyright (C) 2003 Russell King.
7 * Copyright (C) 2003 Wolfson Microelectronics PLC
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * PXA2xx SSP driver. This provides the generic core for simple
14 * IO-based SSP applications and allows easy port setup for DMA access.
15 *
16 * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/errno.h>
24#include <linux/interrupt.h>
25#include <linux/ioport.h>
26#include <linux/init.h>
27#include <linux/mutex.h>
28#include <linux/clk.h>
29#include <linux/err.h>
30#include <linux/platform_device.h>
31#include <linux/io.h>
32
33#include <asm/irq.h>
34#include <mach/hardware.h>
35#include <mach/ssp.h>
36#include <mach/regs-ssp.h>
37
38#ifdef CONFIG_PXA_SSP_LEGACY
39
40#define TIMEOUT 100000
41
42static irqreturn_t ssp_interrupt(int irq, void *dev_id)
43{
44 struct ssp_dev *dev = dev_id;
45 struct ssp_device *ssp = dev->ssp;
46 unsigned int status;
47
48 status = __raw_readl(ssp->mmio_base + SSSR);
49 __raw_writel(status, ssp->mmio_base + SSSR);
50
51 if (status & SSSR_ROR)
52 printk(KERN_WARNING "SSP(%d): receiver overrun\n", dev->port);
53
54 if (status & SSSR_TUR)
55 printk(KERN_WARNING "SSP(%d): transmitter underrun\n", dev->port);
56
57 if (status & SSSR_BCE)
58 printk(KERN_WARNING "SSP(%d): bit count error\n", dev->port);
59
60 return IRQ_HANDLED;
61}
62
63/**
64 * ssp_write_word - write a word to the SSP port
65 * @data: 32-bit, MSB justified data to write.
66 *
67 * Wait for a free entry in the SSP transmit FIFO, and write a data
68 * word to the SSP port.
69 *
70 * The caller is expected to perform the necessary locking.
71 *
72 * Returns:
73 * %-ETIMEDOUT timeout occurred
74 * 0 success
75 */
76int ssp_write_word(struct ssp_dev *dev, u32 data)
77{
78 struct ssp_device *ssp = dev->ssp;
79 int timeout = TIMEOUT;
80
81 while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_TNF)) {
82 if (!--timeout)
83 return -ETIMEDOUT;
84 cpu_relax();
85 }
86
87 __raw_writel(data, ssp->mmio_base + SSDR);
88
89 return 0;
90}
91
92/**
93 * ssp_read_word - read a word from the SSP port
94 *
95 * Wait for a data word in the SSP receive FIFO, and return the
96 * received data. Data is LSB justified.
97 *
98 * Note: Currently, if data is not expected to be received, this
99 * function will wait for ever.
100 *
101 * The caller is expected to perform the necessary locking.
102 *
103 * Returns:
104 * %-ETIMEDOUT timeout occurred
105 * 32-bit data success
106 */
107int ssp_read_word(struct ssp_dev *dev, u32 *data)
108{
109 struct ssp_device *ssp = dev->ssp;
110 int timeout = TIMEOUT;
111
112 while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE)) {
113 if (!--timeout)
114 return -ETIMEDOUT;
115 cpu_relax();
116 }
117
118 *data = __raw_readl(ssp->mmio_base + SSDR);
119 return 0;
120}
121
122/**
123 * ssp_flush - flush the transmit and receive FIFOs
124 *
125 * Wait for the SSP to idle, and ensure that the receive FIFO
126 * is empty.
127 *
128 * The caller is expected to perform the necessary locking.
129 */
130int ssp_flush(struct ssp_dev *dev)
131{
132 struct ssp_device *ssp = dev->ssp;
133 int timeout = TIMEOUT * 2;
134
135 /* ensure TX FIFO is empty instead of not full */
136 if (cpu_is_pxa3xx()) {
137 while (__raw_readl(ssp->mmio_base + SSSR) & 0xf00) {
138 if (!--timeout)
139 return -ETIMEDOUT;
140 cpu_relax();
141 }
142 timeout = TIMEOUT * 2;
143 }
144
145 do {
146 while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
147 if (!--timeout)
148 return -ETIMEDOUT;
149 (void)__raw_readl(ssp->mmio_base + SSDR);
150 }
151 if (!--timeout)
152 return -ETIMEDOUT;
153 } while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_BSY);
154
155 return 0;
156}
157
158/**
159 * ssp_enable - enable the SSP port
160 *
161 * Turn on the SSP port.
162 */
163void ssp_enable(struct ssp_dev *dev)
164{
165 struct ssp_device *ssp = dev->ssp;
166 uint32_t sscr0;
167
168 sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
169 sscr0 |= SSCR0_SSE;
170 __raw_writel(sscr0, ssp->mmio_base + SSCR0);
171}
172
173/**
174 * ssp_disable - shut down the SSP port
175 *
176 * Turn off the SSP port, optionally powering it down.
177 */
178void ssp_disable(struct ssp_dev *dev)
179{
180 struct ssp_device *ssp = dev->ssp;
181 uint32_t sscr0;
182
183 sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
184 sscr0 &= ~SSCR0_SSE;
185 __raw_writel(sscr0, ssp->mmio_base + SSCR0);
186}
187
188/**
189 * ssp_save_state - save the SSP configuration
190 * @ssp: pointer to structure to save SSP configuration
191 *
192 * Save the configured SSP state for suspend.
193 */
194void ssp_save_state(struct ssp_dev *dev, struct ssp_state *state)
195{
196 struct ssp_device *ssp = dev->ssp;
197
198 state->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
199 state->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
200 state->to = __raw_readl(ssp->mmio_base + SSTO);
201 state->psp = __raw_readl(ssp->mmio_base + SSPSP);
202
203 ssp_disable(dev);
204}
205
206/**
207 * ssp_restore_state - restore a previously saved SSP configuration
208 * @ssp: pointer to configuration saved by ssp_save_state
209 *
210 * Restore the SSP configuration saved previously by ssp_save_state.
211 */
212void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *state)
213{
214 struct ssp_device *ssp = dev->ssp;
215 uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;
216
217 __raw_writel(sssr, ssp->mmio_base + SSSR);
218
219 __raw_writel(state->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
220 __raw_writel(state->cr1, ssp->mmio_base + SSCR1);
221 __raw_writel(state->to, ssp->mmio_base + SSTO);
222 __raw_writel(state->psp, ssp->mmio_base + SSPSP);
223 __raw_writel(state->cr0, ssp->mmio_base + SSCR0);
224}
225
226/**
227 * ssp_config - configure SSP port settings
228 * @mode: port operating mode
229 * @flags: port config flags
230 * @psp_flags: port PSP config flags
231 * @speed: port speed
232 *
233 * Port MUST be disabled by ssp_disable before making any config changes.
234 */
235int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed)
236{
237 struct ssp_device *ssp = dev->ssp;
238
239 dev->mode = mode;
240 dev->flags = flags;
241 dev->psp_flags = psp_flags;
242 dev->speed = speed;
243
244 /* set up port type, speed, port settings */
245 __raw_writel((dev->speed | dev->mode), ssp->mmio_base + SSCR0);
246 __raw_writel(dev->flags, ssp->mmio_base + SSCR1);
247 __raw_writel(dev->psp_flags, ssp->mmio_base + SSPSP);
248
249 return 0;
250}
251
252/**
253 * ssp_init - setup the SSP port
254 *
255 * initialise and claim resources for the SSP port.
256 *
257 * Returns:
258 * %-ENODEV if the SSP port is unavailable
259 * %-EBUSY if the resources are already in use
260 * %0 on success
261 */
262int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
263{
264 struct ssp_device *ssp;
265 int ret;
266
267 ssp = ssp_request(port, "SSP");
268 if (ssp == NULL)
269 return -ENODEV;
270
271 dev->ssp = ssp;
272 dev->port = port;
273
274 /* do we need to get irq */
275 if (!(init_flags & SSP_NO_IRQ)) {
276 ret = request_irq(ssp->irq, ssp_interrupt,
277 0, "SSP", dev);
278 if (ret)
279 goto out_region;
280 dev->irq = ssp->irq;
281 } else
282 dev->irq = NO_IRQ;
283
284 /* turn on SSP port clock */
285 clk_enable(ssp->clk);
286 return 0;
287
288out_region:
289 ssp_free(ssp);
290 return ret;
291}
292
293/**
294 * ssp_exit - undo the effects of ssp_init
295 *
296 * release and free resources for the SSP port.
297 */
298void ssp_exit(struct ssp_dev *dev)
299{
300 struct ssp_device *ssp = dev->ssp;
301
302 ssp_disable(dev);
303 if (dev->irq != NO_IRQ)
304 free_irq(dev->irq, dev);
305 clk_disable(ssp->clk);
306 ssp_free(ssp);
307}
308#endif /* CONFIG_PXA_SSP_LEGACY */
309
310static DEFINE_MUTEX(ssp_lock);
311static LIST_HEAD(ssp_list);
312
313struct ssp_device *ssp_request(int port, const char *label)
314{
315 struct ssp_device *ssp = NULL;
316
317 mutex_lock(&ssp_lock);
318
319 list_for_each_entry(ssp, &ssp_list, node) {
320 if (ssp->port_id == port && ssp->use_count == 0) {
321 ssp->use_count++;
322 ssp->label = label;
323 break;
324 }
325 }
326
327 mutex_unlock(&ssp_lock);
328
329 if (&ssp->node == &ssp_list)
330 return NULL;
331
332 return ssp;
333}
334EXPORT_SYMBOL(ssp_request);
335
336void ssp_free(struct ssp_device *ssp)
337{
338 mutex_lock(&ssp_lock);
339 if (ssp->use_count) {
340 ssp->use_count--;
341 ssp->label = NULL;
342 } else
343 dev_err(&ssp->pdev->dev, "device already free\n");
344 mutex_unlock(&ssp_lock);
345}
346EXPORT_SYMBOL(ssp_free);
347
348static int __devinit ssp_probe(struct platform_device *pdev)
349{
350 const struct platform_device_id *id = platform_get_device_id(pdev);
351 struct resource *res;
352 struct ssp_device *ssp;
353 int ret = 0;
354
355 ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL);
356 if (ssp == NULL) {
357 dev_err(&pdev->dev, "failed to allocate memory");
358 return -ENOMEM;
359 }
360 ssp->pdev = pdev;
361
362 ssp->clk = clk_get(&pdev->dev, NULL);
363 if (IS_ERR(ssp->clk)) {
364 ret = PTR_ERR(ssp->clk);
365 goto err_free;
366 }
367
368 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
369 if (res == NULL) {
370 dev_err(&pdev->dev, "no memory resource defined\n");
371 ret = -ENODEV;
372 goto err_free_clk;
373 }
374
375 res = request_mem_region(res->start, res->end - res->start + 1,
376 pdev->name);
377 if (res == NULL) {
378 dev_err(&pdev->dev, "failed to request memory resource\n");
379 ret = -EBUSY;
380 goto err_free_clk;
381 }
382
383 ssp->phys_base = res->start;
384
385 ssp->mmio_base = ioremap(res->start, res->end - res->start + 1);
386 if (ssp->mmio_base == NULL) {
387 dev_err(&pdev->dev, "failed to ioremap() registers\n");
388 ret = -ENODEV;
389 goto err_free_mem;
390 }
391
392 ssp->irq = platform_get_irq(pdev, 0);
393 if (ssp->irq < 0) {
394 dev_err(&pdev->dev, "no IRQ resource defined\n");
395 ret = -ENODEV;
396 goto err_free_io;
397 }
398
399 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
400 if (res == NULL) {
401 dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
402 ret = -ENODEV;
403 goto err_free_io;
404 }
405 ssp->drcmr_rx = res->start;
406
407 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
408 if (res == NULL) {
409 dev_err(&pdev->dev, "no SSP TX DRCMR defined\n");
410 ret = -ENODEV;
411 goto err_free_io;
412 }
413 ssp->drcmr_tx = res->start;
414
415 /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
416 * starts from 0, do a translation here
417 */
418 ssp->port_id = pdev->id + 1;
419 ssp->use_count = 0;
420 ssp->type = (int)id->driver_data;
421
422 mutex_lock(&ssp_lock);
423 list_add(&ssp->node, &ssp_list);
424 mutex_unlock(&ssp_lock);
425
426 platform_set_drvdata(pdev, ssp);
427 return 0;
428
429err_free_io:
430 iounmap(ssp->mmio_base);
431err_free_mem:
432 release_mem_region(res->start, res->end - res->start + 1);
433err_free_clk:
434 clk_put(ssp->clk);
435err_free:
436 kfree(ssp);
437 return ret;
438}
439
440static int __devexit ssp_remove(struct platform_device *pdev)
441{
442 struct resource *res;
443 struct ssp_device *ssp;
444
445 ssp = platform_get_drvdata(pdev);
446 if (ssp == NULL)
447 return -ENODEV;
448
449 iounmap(ssp->mmio_base);
450
451 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
452 release_mem_region(res->start, res->end - res->start + 1);
453
454 clk_put(ssp->clk);
455
456 mutex_lock(&ssp_lock);
457 list_del(&ssp->node);
458 mutex_unlock(&ssp_lock);
459
460 kfree(ssp);
461 return 0;
462}
463
464static const struct platform_device_id ssp_id_table[] = {
465 { "pxa25x-ssp", PXA25x_SSP },
466 { "pxa25x-nssp", PXA25x_NSSP },
467 { "pxa27x-ssp", PXA27x_SSP },
468 { },
469};
470
471static struct platform_driver ssp_driver = {
472 .probe = ssp_probe,
473 .remove = __devexit_p(ssp_remove),
474 .driver = {
475 .owner = THIS_MODULE,
476 .name = "pxa2xx-ssp",
477 },
478 .id_table = ssp_id_table,
479};
480
481static int __init pxa_ssp_init(void)
482{
483 return platform_driver_register(&ssp_driver);
484}
485
486static void __exit pxa_ssp_exit(void)
487{
488 platform_driver_unregister(&ssp_driver);
489}
490
491arch_initcall(pxa_ssp_init);
492module_exit(pxa_ssp_exit);
493
494#ifdef CONFIG_PXA_SSP_LEGACY
495EXPORT_SYMBOL(ssp_write_word);
496EXPORT_SYMBOL(ssp_read_word);
497EXPORT_SYMBOL(ssp_flush);
498EXPORT_SYMBOL(ssp_enable);
499EXPORT_SYMBOL(ssp_disable);
500EXPORT_SYMBOL(ssp_save_state);
501EXPORT_SYMBOL(ssp_restore_state);
502EXPORT_SYMBOL(ssp_init);
503EXPORT_SYMBOL(ssp_exit);
504EXPORT_SYMBOL(ssp_config);
505#endif
506
507MODULE_DESCRIPTION("PXA SSP driver");
508MODULE_AUTHOR("Liam Girdwood");
509MODULE_LICENSE("GPL");
510
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