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- /*
- * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
- *
- * Author: Nicolas Pitre
- * Created: Dec 02, 2004
- * Copyright: MontaVista Software Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/interrupt.h>
- #include <linux/wait.h>
- #include <linux/delay.h>
- #include <sound/driver.h>
- #include <sound/core.h>
- #include <sound/pcm.h>
- #include <sound/ac97_codec.h>
- #include <sound/initval.h>
- #include <sound/soc.h>
- #include <asm/irq.h>
- #include <linux/mutex.h>
- #include <asm/hardware.h>
- #include <asm/arch/pxa-regs.h>
- #include <asm/arch/audio.h>
- #include "pxa2xx-pcm.h"
- #include "pxa2xx-ac97.h"
- static DEFINE_MUTEX(car_mutex);
- static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
- static volatile long gsr_bits;
- /*
- * Beware PXA27x bugs:
- *
- * o Slot 12 read from modem space will hang controller.
- * o CDONE, SDONE interrupt fails after any slot 12 IO.
- *
- * We therefore have an hybrid approach for waiting on SDONE (interrupt or
- * 1 jiffy timeout if interrupt never comes).
- */
- static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97,
- unsigned short reg)
- {
- unsigned short val = -1;
- volatile u32 *reg_addr;
- mutex_lock(&car_mutex);
- /* set up primary or secondary codec/modem space */
- #ifdef CONFIG_PXA27x
- reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
- #else
- if (reg == AC97_GPIO_STATUS)
- reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
- else
- reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
- #endif
- reg_addr += (reg >> 1);
- #ifndef CONFIG_PXA27x
- if (reg == AC97_GPIO_STATUS) {
- /* read from controller cache */
- val = *reg_addr;
- goto out;
- }
- #endif
- /* start read access across the ac97 link */
- GSR = GSR_CDONE | GSR_SDONE;
- gsr_bits = 0;
- val = *reg_addr;
- wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
- if (!((GSR | gsr_bits) & GSR_SDONE)) {
- printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
- __FUNCTION__, reg, GSR | gsr_bits);
- val = -1;
- goto out;
- }
- /* valid data now */
- GSR = GSR_CDONE | GSR_SDONE;
- gsr_bits = 0;
- val = *reg_addr;
- /* but we've just started another cycle... */
- wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
- out: mutex_unlock(&car_mutex);
- return val;
- }
- static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
- unsigned short val)
- {
- volatile u32 *reg_addr;
- mutex_lock(&car_mutex);
- /* set up primary or secondary codec/modem space */
- #ifdef CONFIG_PXA27x
- reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
- #else
- if (reg == AC97_GPIO_STATUS)
- reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
- else
- reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
- #endif
- reg_addr += (reg >> 1);
- GSR = GSR_CDONE | GSR_SDONE;
- gsr_bits = 0;
- *reg_addr = val;
- wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1);
- if (!((GSR | gsr_bits) & GSR_CDONE))
- printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
- __FUNCTION__, reg, GSR | gsr_bits);
- mutex_unlock(&car_mutex);
- }
- static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
- {
- gsr_bits = 0;
- #ifdef CONFIG_PXA27x
- /* warm reset broken on Bulverde,
- so manually keep AC97 reset high */
- pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
- udelay(10);
- GCR |= GCR_WARM_RST;
- pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
- udelay(500);
- #else
- GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
- wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
- #endif
- if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
- printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
- __FUNCTION__, gsr_bits);
- GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
- GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
- }
- static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
- {
- GCR &= GCR_COLD_RST; /* clear everything but nCRST */
- GCR &= ~GCR_COLD_RST; /* then assert nCRST */
- gsr_bits = 0;
- #ifdef CONFIG_PXA27x
- /* PXA27x Developers Manual section 13.5.2.2.1 */
- pxa_set_cken(1 << 31, 1);
- udelay(5);
- pxa_set_cken(1 << 31, 0);
- GCR = GCR_COLD_RST;
- udelay(50);
- #else
- GCR = GCR_COLD_RST;
- GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
- wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
- #endif
- if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
- printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
- __FUNCTION__, gsr_bits);
- GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
- GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
- }
- static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
- {
- long status;
- status = GSR;
- if (status) {
- GSR = status;
- gsr_bits |= status;
- wake_up(&gsr_wq);
- #ifdef CONFIG_PXA27x
- /* Although we don't use those we still need to clear them
- since they tend to spuriously trigger when MMC is used
- (hardware bug? go figure)... */
- MISR = MISR_EOC;
- PISR = PISR_EOC;
- MCSR = MCSR_EOC;
- #endif
- return IRQ_HANDLED;
- }
- return IRQ_NONE;
- }
- struct snd_ac97_bus_ops soc_ac97_ops = {
- .read = pxa2xx_ac97_read,
- .write = pxa2xx_ac97_write,
- .warm_reset = pxa2xx_ac97_warm_reset,
- .reset = pxa2xx_ac97_cold_reset,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
- .name = "AC97 PCM Stereo out",
- .dev_addr = __PREG(PCDR),
- .drcmr = &DRCMRTXPCDR,
- .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
- DCMD_BURST32 | DCMD_WIDTH4,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
- .name = "AC97 PCM Stereo in",
- .dev_addr = __PREG(PCDR),
- .drcmr = &DRCMRRXPCDR,
- .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
- DCMD_BURST32 | DCMD_WIDTH4,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
- .name = "AC97 Aux PCM (Slot 5) Mono out",
- .dev_addr = __PREG(MODR),
- .drcmr = &DRCMRTXMODR,
- .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
- DCMD_BURST16 | DCMD_WIDTH2,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
- .name = "AC97 Aux PCM (Slot 5) Mono in",
- .dev_addr = __PREG(MODR),
- .drcmr = &DRCMRRXMODR,
- .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
- DCMD_BURST16 | DCMD_WIDTH2,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
- .name = "AC97 Mic PCM (Slot 6) Mono in",
- .dev_addr = __PREG(MCDR),
- .drcmr = &DRCMRRXMCDR,
- .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
- DCMD_BURST16 | DCMD_WIDTH2,
- };
- #ifdef CONFIG_PM
- static int pxa2xx_ac97_suspend(struct platform_device *pdev,
- struct snd_soc_cpu_dai *dai)
- {
- GCR |= GCR_ACLINK_OFF;
- pxa_set_cken(CKEN2_AC97, 0);
- return 0;
- }
- static int pxa2xx_ac97_resume(struct platform_device *pdev,
- struct snd_soc_cpu_dai *dai)
- {
- pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
- pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
- pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
- pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
- #ifdef CONFIG_PXA27x
- /* Use GPIO 113 as AC97 Reset on Bulverde */
- pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
- #endif
- pxa_set_cken(CKEN2_AC97, 1);
- return 0;
- }
- #else
- #define pxa2xx_ac97_suspend NULL
- #define pxa2xx_ac97_resume NULL
- #endif
- static int pxa2xx_ac97_probe(struct platform_device *pdev)
- {
- int ret;
- ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
- if (ret < 0)
- goto err;
- pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
- pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
- pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
- pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
- #ifdef CONFIG_PXA27x
- /* Use GPIO 113 as AC97 Reset on Bulverde */
- pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
- #endif
- pxa_set_cken(CKEN2_AC97, 1);
- return 0;
- err:
- if (CKEN & CKEN2_AC97) {
- GCR |= GCR_ACLINK_OFF;
- free_irq(IRQ_AC97, NULL);
- pxa_set_cken(CKEN2_AC97, 0);
- }
- return ret;
- }
- static void pxa2xx_ac97_remove(struct platform_device *pdev)
- {
- GCR |= GCR_ACLINK_OFF;
- free_irq(IRQ_AC97, NULL);
- pxa_set_cken(CKEN2_AC97, 0);
- }
- static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
- else
- cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;
- return 0;
- }
- static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
- else
- cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;
- return 0;
- }
- static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- return -ENODEV;
- else
- cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;
- return 0;
- }
- #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
- SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
- SNDRV_PCM_RATE_48000)
- /*
- * There is only 1 physical AC97 interface for pxa2xx, but it
- * has extra fifo's that can be used for aux DACs and ADCs.
- */
- struct snd_soc_cpu_dai pxa_ac97_dai[] = {
- {
- .name = "pxa2xx-ac97",
- .id = 0,
- .type = SND_SOC_DAI_AC97,
- .probe = pxa2xx_ac97_probe,
- .remove = pxa2xx_ac97_remove,
- .suspend = pxa2xx_ac97_suspend,
- .resume = pxa2xx_ac97_resume,
- .playback = {
- .stream_name = "AC97 Playback",
- .channels_min = 2,
- .channels_max = 2,
- .rates = PXA2XX_AC97_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .capture = {
- .stream_name = "AC97 Capture",
- .channels_min = 2,
- .channels_max = 2,
- .rates = PXA2XX_AC97_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .ops = {
- .hw_params = pxa2xx_ac97_hw_params,},
- },
- {
- .name = "pxa2xx-ac97-aux",
- .id = 1,
- .type = SND_SOC_DAI_AC97,
- .playback = {
- .stream_name = "AC97 Aux Playback",
- .channels_min = 1,
- .channels_max = 1,
- .rates = PXA2XX_AC97_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .capture = {
- .stream_name = "AC97 Aux Capture",
- .channels_min = 1,
- .channels_max = 1,
- .rates = PXA2XX_AC97_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .ops = {
- .hw_params = pxa2xx_ac97_hw_aux_params,},
- },
- {
- .name = "pxa2xx-ac97-mic",
- .id = 2,
- .type = SND_SOC_DAI_AC97,
- .capture = {
- .stream_name = "AC97 Mic Capture",
- .channels_min = 1,
- .channels_max = 1,
- .rates = PXA2XX_AC97_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .ops = {
- .hw_params = pxa2xx_ac97_hw_mic_params,},
- },
- };
- EXPORT_SYMBOL_GPL(pxa_ac97_dai);
- EXPORT_SYMBOL_GPL(soc_ac97_ops);
- MODULE_AUTHOR("Nicolas Pitre");
- MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
- MODULE_LICENSE("GPL");
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