2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
4 * Author: Nicolas Pitre
5 * Created: Dec 02, 2004
6 * Copyright: MontaVista Software Inc.
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.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/wait.h>
18 #include <linux/clk.h>
19 #include <linux/delay.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/ac97_codec.h>
24 #include <sound/initval.h>
25 #include <sound/soc.h>
28 #include <linux/mutex.h>
29 #include <asm/hardware.h>
30 #include <asm/arch/pxa-regs.h>
31 #include <asm/arch/pxa2xx-gpio.h>
32 #include <asm/arch/audio.h>
34 #include "pxa2xx-pcm.h"
35 #include "pxa2xx-ac97.h"
37 static DEFINE_MUTEX(car_mutex);
38 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
39 static volatile long gsr_bits;
40 static struct clk *ac97_clk;
42 static struct clk *ac97conf_clk;
48 * o Slot 12 read from modem space will hang controller.
49 * o CDONE, SDONE interrupt fails after any slot 12 IO.
51 * We therefore have an hybrid approach for waiting on SDONE (interrupt or
52 * 1 jiffy timeout if interrupt never comes).
55 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97,
58 unsigned short val = -1;
59 volatile u32 *reg_addr;
61 mutex_lock(&car_mutex);
63 /* set up primary or secondary codec/modem space */
64 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
65 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
67 if (reg == AC97_GPIO_STATUS)
68 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
70 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
72 reg_addr += (reg >> 1);
75 if (reg == AC97_GPIO_STATUS) {
76 /* read from controller cache */
82 /* start read access across the ac97 link */
83 GSR = GSR_CDONE | GSR_SDONE;
87 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
88 if (!((GSR | gsr_bits) & GSR_SDONE)) {
89 printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
90 __func__, reg, GSR | gsr_bits);
96 GSR = GSR_CDONE | GSR_SDONE;
99 /* but we've just started another cycle... */
100 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
102 out: mutex_unlock(&car_mutex);
106 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
109 volatile u32 *reg_addr;
111 mutex_lock(&car_mutex);
113 /* set up primary or secondary codec/modem space */
114 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
115 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
117 if (reg == AC97_GPIO_STATUS)
118 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
120 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
122 reg_addr += (reg >> 1);
124 GSR = GSR_CDONE | GSR_SDONE;
127 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1);
128 if (!((GSR | gsr_bits) & GSR_CDONE))
129 printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
130 __func__, reg, GSR | gsr_bits);
132 mutex_unlock(&car_mutex);
135 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
143 /* warm reset broken on Bulverde,
144 so manually keep AC97 reset high */
145 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
148 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
150 #elif defined(CONFIG_PXA3xx)
151 /* Can't use interrupts */
153 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
156 GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
157 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
160 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
161 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
164 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
165 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
168 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
173 /* Hold CLKBPB for 100us */
180 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
181 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
185 /* PXA27x Developers Manual section 13.5.2.2.1 */
186 clk_enable(ac97conf_clk);
188 clk_disable(ac97conf_clk);
191 #elif defined(CONFIG_PXA3xx)
192 /* Can't use interrupts on PXA3xx */
193 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
195 GCR = GCR_WARM_RST | GCR_COLD_RST;
196 while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
200 GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
201 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
204 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
205 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
208 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
209 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
212 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
223 /* Although we don't use those we still need to clear them
224 since they tend to spuriously trigger when MMC is used
225 (hardware bug? go figure)... */
237 struct snd_ac97_bus_ops soc_ac97_ops = {
238 .read = pxa2xx_ac97_read,
239 .write = pxa2xx_ac97_write,
240 .warm_reset = pxa2xx_ac97_warm_reset,
241 .reset = pxa2xx_ac97_cold_reset,
244 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
245 .name = "AC97 PCM Stereo out",
246 .dev_addr = __PREG(PCDR),
247 .drcmr = &DRCMRTXPCDR,
248 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
249 DCMD_BURST32 | DCMD_WIDTH4,
252 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
253 .name = "AC97 PCM Stereo in",
254 .dev_addr = __PREG(PCDR),
255 .drcmr = &DRCMRRXPCDR,
256 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
257 DCMD_BURST32 | DCMD_WIDTH4,
260 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
261 .name = "AC97 Aux PCM (Slot 5) Mono out",
262 .dev_addr = __PREG(MODR),
263 .drcmr = &DRCMRTXMODR,
264 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
265 DCMD_BURST16 | DCMD_WIDTH2,
268 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
269 .name = "AC97 Aux PCM (Slot 5) Mono in",
270 .dev_addr = __PREG(MODR),
271 .drcmr = &DRCMRRXMODR,
272 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
273 DCMD_BURST16 | DCMD_WIDTH2,
276 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
277 .name = "AC97 Mic PCM (Slot 6) Mono in",
278 .dev_addr = __PREG(MCDR),
279 .drcmr = &DRCMRRXMCDR,
280 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
281 DCMD_BURST16 | DCMD_WIDTH2,
285 static int pxa2xx_ac97_suspend(struct platform_device *pdev,
286 struct snd_soc_dai *dai)
288 GCR |= GCR_ACLINK_OFF;
289 clk_disable(ac97_clk);
293 static int pxa2xx_ac97_resume(struct platform_device *pdev,
294 struct snd_soc_dai *dai)
296 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
297 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
298 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
299 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
301 /* Use GPIO 113 as AC97 Reset on Bulverde */
302 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
304 clk_enable(ac97_clk);
309 #define pxa2xx_ac97_suspend NULL
310 #define pxa2xx_ac97_resume NULL
313 static int pxa2xx_ac97_probe(struct platform_device *pdev,
314 struct snd_soc_dai *dai)
318 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
322 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
323 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
324 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
325 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
327 /* Use GPIO 113 as AC97 Reset on Bulverde */
328 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
330 ac97conf_clk = clk_get(&pdev->dev, "AC97CONFCLK");
331 if (IS_ERR(ac97conf_clk)) {
332 ret = PTR_ERR(ac97conf_clk);
337 ac97_clk = clk_get(&pdev->dev, "AC97CLK");
338 if (IS_ERR(ac97_clk)) {
339 ret = PTR_ERR(ac97_clk);
343 clk_enable(ac97_clk);
347 GCR |= GCR_ACLINK_OFF;
350 clk_put(ac97conf_clk);
354 free_irq(IRQ_AC97, NULL);
359 static void pxa2xx_ac97_remove(struct platform_device *pdev,
360 struct snd_soc_dai *dai)
362 GCR |= GCR_ACLINK_OFF;
363 free_irq(IRQ_AC97, NULL);
365 clk_put(ac97conf_clk);
368 clk_disable(ac97_clk);
373 static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
374 struct snd_pcm_hw_params *params)
376 struct snd_soc_pcm_runtime *rtd = substream->private_data;
377 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
379 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
380 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
382 cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;
387 static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
388 struct snd_pcm_hw_params *params)
390 struct snd_soc_pcm_runtime *rtd = substream->private_data;
391 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
393 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
394 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
396 cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;
401 static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
402 struct snd_pcm_hw_params *params)
404 struct snd_soc_pcm_runtime *rtd = substream->private_data;
405 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
407 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
410 cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;
415 #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
416 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
417 SNDRV_PCM_RATE_48000)
420 * There is only 1 physical AC97 interface for pxa2xx, but it
421 * has extra fifo's that can be used for aux DACs and ADCs.
423 struct snd_soc_dai pxa_ac97_dai[] = {
425 .name = "pxa2xx-ac97",
427 .type = SND_SOC_DAI_AC97,
428 .probe = pxa2xx_ac97_probe,
429 .remove = pxa2xx_ac97_remove,
430 .suspend = pxa2xx_ac97_suspend,
431 .resume = pxa2xx_ac97_resume,
433 .stream_name = "AC97 Playback",
436 .rates = PXA2XX_AC97_RATES,
437 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
439 .stream_name = "AC97 Capture",
442 .rates = PXA2XX_AC97_RATES,
443 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
445 .hw_params = pxa2xx_ac97_hw_params,},
448 .name = "pxa2xx-ac97-aux",
450 .type = SND_SOC_DAI_AC97,
452 .stream_name = "AC97 Aux Playback",
455 .rates = PXA2XX_AC97_RATES,
456 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
458 .stream_name = "AC97 Aux Capture",
461 .rates = PXA2XX_AC97_RATES,
462 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
464 .hw_params = pxa2xx_ac97_hw_aux_params,},
467 .name = "pxa2xx-ac97-mic",
469 .type = SND_SOC_DAI_AC97,
471 .stream_name = "AC97 Mic Capture",
474 .rates = PXA2XX_AC97_RATES,
475 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
477 .hw_params = pxa2xx_ac97_hw_mic_params,},
481 EXPORT_SYMBOL_GPL(pxa_ac97_dai);
482 EXPORT_SYMBOL_GPL(soc_ac97_ops);
484 MODULE_AUTHOR("Nicolas Pitre");
485 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
486 MODULE_LICENSE("GPL");