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Takashi Iwai2c484df2005-06-30 18:54:04 +02001/*
2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
3 *
4 * Author: Nicolas Pitre
5 * Created: Dec 02, 2004
6 * Copyright: MontaVista Software Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/device.h>
17#include <linux/interrupt.h>
18#include <linux/wait.h>
19#include <linux/delay.h>
20
21#include <sound/driver.h>
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/ac97_codec.h>
25#include <sound/initval.h>
26
27#include <asm/irq.h>
28#include <asm/semaphore.h>
29#include <asm/hardware.h>
30#include <asm/arch/pxa-regs.h>
31#include <asm/arch/audio.h>
32
33#include "pxa2xx-pcm.h"
34
35
36static DECLARE_MUTEX(car_mutex);
37static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
38static volatile long gsr_bits;
39
40static unsigned short pxa2xx_ac97_read(ac97_t *ac97, unsigned short reg)
41{
42 unsigned short val = -1;
43 volatile u32 *reg_addr;
44
45 down(&car_mutex);
46 if (CAR & CAR_CAIP) {
47 printk(KERN_CRIT"%s: CAR_CAIP already set\n", __FUNCTION__);
48 goto out;
49 }
50
51 /* set up primary or secondary codec space */
52 reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
53 reg_addr += (reg >> 1);
54
55 /* start read access across the ac97 link */
56 gsr_bits = 0;
57 val = *reg_addr;
58 if (reg == AC97_GPIO_STATUS)
59 goto out;
60 wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
61 if (!gsr_bits & GSR_SDONE) {
62 printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
63 __FUNCTION__, reg, gsr_bits);
64 val = -1;
65 goto out;
66 }
67
68 /* valid data now */
69 gsr_bits = 0;
70 val = *reg_addr;
71 /* but we've just started another cycle... */
72 wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
73
74out: up(&car_mutex);
75 return val;
76}
77
78static void pxa2xx_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
79{
80 volatile u32 *reg_addr;
81
82 down(&car_mutex);
83
84 if (CAR & CAR_CAIP) {
85 printk(KERN_CRIT "%s: CAR_CAIP already set\n", __FUNCTION__);
86 goto out;
87 }
88
89 /* set up primary or secondary codec space */
90 reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
91 reg_addr += (reg >> 1);
92 gsr_bits = 0;
93 *reg_addr = val;
94 wait_event_timeout(gsr_wq, gsr_bits & GSR_CDONE, 1);
95 if (!gsr_bits & GSR_SDONE)
96 printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
97 __FUNCTION__, reg, gsr_bits);
98
99out: up(&car_mutex);
100}
101
102static void pxa2xx_ac97_reset(ac97_t *ac97)
103{
104 /* First, try cold reset */
105 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
106 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
107
108 gsr_bits = 0;
109#ifdef CONFIG_PXA27x
110 /* PXA27x Developers Manual section 13.5.2.2.1 */
111 pxa_set_cken(1 << 31, 1);
112 udelay(5);
113 pxa_set_cken(1 << 31, 0);
114 GCR = GCR_COLD_RST;
115 udelay(50);
116#else
117 GCR = GCR_COLD_RST;
118 GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
119 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
120#endif
121
122 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
123 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
124 __FUNCTION__, gsr_bits);
125
126 /* let's try warm reset */
127 gsr_bits = 0;
128#ifdef CONFIG_PXA27x
129 /* warm reset broken on Bulverde,
130 so manually keep AC97 reset high */
131 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
132 udelay(10);
133 GCR |= GCR_WARM_RST;
134 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
Liam Girdwood4a677ac52005-08-05 10:24:36 +0200135 udelay(500);
Takashi Iwai2c484df2005-06-30 18:54:04 +0200136#else
Liam Girdwood4a677ac52005-08-05 10:24:36 +0200137 GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN;
Takashi Iwai2c484df2005-06-30 18:54:04 +0200138 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
139#endif
140
141 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
142 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
143 __FUNCTION__, gsr_bits);
144 }
145
146 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
147 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
148}
149
150static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id, struct pt_regs *regs)
151{
152 long status;
153
154 status = GSR;
155 if (status) {
156 GSR = status;
157 gsr_bits |= status;
158 wake_up(&gsr_wq);
159
160#ifdef CONFIG_PXA27x
161 /* Although we don't use those we still need to clear them
162 since they tend to spuriously trigger when MMC is used
163 (hardware bug? go figure)... */
164 MISR = MISR_EOC;
165 PISR = PISR_EOC;
166 MCSR = MCSR_EOC;
167#endif
168
169 return IRQ_HANDLED;
170 }
171
172 return IRQ_NONE;
173}
174
175static ac97_bus_ops_t pxa2xx_ac97_ops = {
176 .read = pxa2xx_ac97_read,
177 .write = pxa2xx_ac97_write,
178 .reset = pxa2xx_ac97_reset,
179};
180
181static pxa2xx_pcm_dma_params_t pxa2xx_ac97_pcm_out = {
182 .name = "AC97 PCM out",
183 .dev_addr = __PREG(PCDR),
184 .drcmr = &DRCMRTXPCDR,
185 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
186 DCMD_BURST32 | DCMD_WIDTH4,
187};
188
189static pxa2xx_pcm_dma_params_t pxa2xx_ac97_pcm_in = {
190 .name = "AC97 PCM in",
191 .dev_addr = __PREG(PCDR),
192 .drcmr = &DRCMRRXPCDR,
193 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
194 DCMD_BURST32 | DCMD_WIDTH4,
195};
196
197static snd_pcm_t *pxa2xx_ac97_pcm;
198static ac97_t *pxa2xx_ac97_ac97;
199
200static int pxa2xx_ac97_pcm_startup(snd_pcm_substream_t *substream)
201{
202 snd_pcm_runtime_t *runtime = substream->runtime;
203 pxa2xx_audio_ops_t *platform_ops;
204 int r;
205
206 runtime->hw.channels_min = 2;
207 runtime->hw.channels_max = 2;
208
209 r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
210 AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
211 runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
212 snd_pcm_limit_hw_rates(runtime);
213
214 platform_ops = substream->pcm->card->dev->platform_data;
215 if (platform_ops && platform_ops->startup)
216 return platform_ops->startup(substream, platform_ops->priv);
217 else
218 return 0;
219}
220
221static void pxa2xx_ac97_pcm_shutdown(snd_pcm_substream_t *substream)
222{
223 pxa2xx_audio_ops_t *platform_ops;
224
225 platform_ops = substream->pcm->card->dev->platform_data;
226 if (platform_ops && platform_ops->shutdown)
227 platform_ops->shutdown(substream, platform_ops->priv);
228}
229
230static int pxa2xx_ac97_pcm_prepare(snd_pcm_substream_t *substream)
231{
232 snd_pcm_runtime_t *runtime = substream->runtime;
233 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
234 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
235 return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
236}
237
238static pxa2xx_pcm_client_t pxa2xx_ac97_pcm_client = {
239 .playback_params = &pxa2xx_ac97_pcm_out,
240 .capture_params = &pxa2xx_ac97_pcm_in,
241 .startup = pxa2xx_ac97_pcm_startup,
242 .shutdown = pxa2xx_ac97_pcm_shutdown,
243 .prepare = pxa2xx_ac97_pcm_prepare,
244};
245
246#ifdef CONFIG_PM
247
248static int pxa2xx_ac97_do_suspend(snd_card_t *card, unsigned int state)
249{
250 if (card->power_state != SNDRV_CTL_POWER_D3cold) {
251 pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
252 snd_pcm_suspend_all(pxa2xx_ac97_pcm);
253 snd_ac97_suspend(pxa2xx_ac97_ac97);
254 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
255 if (platform_ops && platform_ops->suspend)
256 platform_ops->suspend(platform_ops->priv);
257 GCR |= GCR_ACLINK_OFF;
258 pxa_set_cken(CKEN2_AC97, 0);
259 }
260
261 return 0;
262}
263
Dirk Opfera55bfdc2005-08-08 16:29:43 +0200264static int pxa2xx_ac97_do_resume(snd_card_t *card)
Takashi Iwai2c484df2005-06-30 18:54:04 +0200265{
266 if (card->power_state != SNDRV_CTL_POWER_D0) {
267 pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
268 pxa_set_cken(CKEN2_AC97, 1);
269 if (platform_ops && platform_ops->resume)
270 platform_ops->resume(platform_ops->priv);
271 snd_ac97_resume(pxa2xx_ac97_ac97);
272 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
273 }
274
275 return 0;
276}
277
Dirk Opfera55bfdc2005-08-08 16:29:43 +0200278static int pxa2xx_ac97_suspend(struct device *_dev, pm_message_t state, u32 level)
Takashi Iwai2c484df2005-06-30 18:54:04 +0200279{
280 snd_card_t *card = dev_get_drvdata(_dev);
281 int ret = 0;
282
283 if (card && level == SUSPEND_DISABLE)
Dirk Opfera55bfdc2005-08-08 16:29:43 +0200284 ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
Takashi Iwai2c484df2005-06-30 18:54:04 +0200285
286 return ret;
287}
288
289static int pxa2xx_ac97_resume(struct device *_dev, u32 level)
290{
291 snd_card_t *card = dev_get_drvdata(_dev);
292 int ret = 0;
293
294 if (card && level == RESUME_ENABLE)
Dirk Opfera55bfdc2005-08-08 16:29:43 +0200295 ret = pxa2xx_ac97_do_resume(card);
Takashi Iwai2c484df2005-06-30 18:54:04 +0200296
297 return ret;
298}
299
300#else
301#define pxa2xx_ac97_suspend NULL
302#define pxa2xx_ac97_resume NULL
303#endif
304
305static int pxa2xx_ac97_probe(struct device *dev)
306{
307 snd_card_t *card;
308 ac97_bus_t *ac97_bus;
309 ac97_template_t ac97_template;
310 int ret;
311
312 ret = -ENOMEM;
313 card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
314 THIS_MODULE, 0);
315 if (!card)
316 goto err;
317
318 card->dev = dev;
319 strncpy(card->driver, dev->driver->name, sizeof(card->driver));
320
321 ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
322 if (ret)
323 goto err;
324
325 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
326 if (ret < 0)
327 goto err;
328
329 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
330 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
331 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
332 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
333#ifdef CONFIG_PXA27x
334 /* Use GPIO 113 as AC97 Reset on Bulverde */
335 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
336#endif
337 pxa_set_cken(CKEN2_AC97, 1);
338
339 ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
340 if (ret)
341 goto err;
342 memset(&ac97_template, 0, sizeof(ac97_template));
343 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
344 if (ret)
345 goto err;
346
347 snprintf(card->shortname, sizeof(card->shortname),
348 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
349 snprintf(card->longname, sizeof(card->longname),
350 "%s (%s)", dev->driver->name, card->mixername);
351
352 snd_card_set_pm_callback(card, pxa2xx_ac97_do_suspend,
353 pxa2xx_ac97_do_resume, NULL);
354 ret = snd_card_register(card);
355 if (ret == 0) {
356 dev_set_drvdata(dev, card);
357 return 0;
358 }
359
360 err:
361 if (card)
362 snd_card_free(card);
363 if (CKEN & CKEN2_AC97) {
364 GCR |= GCR_ACLINK_OFF;
365 free_irq(IRQ_AC97, NULL);
366 pxa_set_cken(CKEN2_AC97, 0);
367 }
368 return ret;
369}
370
371static int pxa2xx_ac97_remove(struct device *dev)
372{
373 snd_card_t *card = dev_get_drvdata(dev);
374
375 if (card) {
376 snd_card_free(card);
377 dev_set_drvdata(dev, NULL);
378 GCR |= GCR_ACLINK_OFF;
379 free_irq(IRQ_AC97, NULL);
380 pxa_set_cken(CKEN2_AC97, 0);
381 }
382
383 return 0;
384}
385
386static struct device_driver pxa2xx_ac97_driver = {
387 .name = "pxa2xx-ac97",
388 .bus = &platform_bus_type,
389 .probe = pxa2xx_ac97_probe,
390 .remove = pxa2xx_ac97_remove,
391 .suspend = pxa2xx_ac97_suspend,
392 .resume = pxa2xx_ac97_resume,
393};
394
395static int __init pxa2xx_ac97_init(void)
396{
397 return driver_register(&pxa2xx_ac97_driver);
398}
399
400static void __exit pxa2xx_ac97_exit(void)
401{
402 driver_unregister(&pxa2xx_ac97_driver);
403}
404
405module_init(pxa2xx_ac97_init);
406module_exit(pxa2xx_ac97_exit);
407
408MODULE_AUTHOR("Nicolas Pitre");
409MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
410MODULE_LICENSE("GPL");