[ALSA] ASoC pxa2xx AC97 support

This patch adds pxa2xx AC97 ASoC audio support. It's based on
sound/arm/pxa-ac97 by Nicolas Pitre with the following differences.
 o Modified driver structure to use ASoC core PCM callbacks.
 o Removed AC97 configuration function (all handled in ASoC core)
 o Added and exported ASoC DAI configuration table.
 o Added DMA support for AUX DAC and Mic ADC
 o Separated out AC97 reset into cold and warm reset functions.
From: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 437 insertions, 0 deletions

diff --git a/sound/soc/pxa/pxa2xx-ac97.c b/sound/soc/pxa/pxa2xx-ac97.c
new file mode 100644
index 000000000000..28b1985edc05
--- /dev/null
+++ b/sound/soc/pxa/pxa2xx-ac97.c
@@ -0,0 +1,437 @@
+/*
+ * 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"
+
+static DEFINE_MUTEX(car_mutex);
+static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
+static volatile long gsr_bits;
+
+#define AC97_DIR \
+        (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define 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)
+
+/* may need to expand this */
+static struct snd_soc_dai_mode pxa2xx_ac97_modes[] = {
+        {
+                .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE,
+                .pcmrate = AC97_RATES,
+                .pcmdir = AC97_DIR,
+        },
+};
+
+/*
+ * 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;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                rtd->cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
+        else
+                rtd->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;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                rtd->cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
+        else
+                rtd->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;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                return -ENODEV;
+        else
+                rtd->cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;
+
+        return 0;
+}
+
+/*
+ * 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,},
+        .capture = {
+                .stream_name = "AC97 Capture",
+                .channels_min = 2,
+                .channels_max = 2,},
+        .ops = {
+                .hw_params = pxa2xx_ac97_hw_params,},
+        .caps = {
+                .num_modes = ARRAY_SIZE(pxa2xx_ac97_modes),
+                .mode = pxa2xx_ac97_modes,},
+},
+{
+        .name = "pxa2xx-ac97-aux",
+        .id = 1,
+        .type = SND_SOC_DAI_AC97,
+        .playback = {
+                .stream_name = "AC97 Aux Playback",
+                .channels_min = 1,
+                .channels_max = 1,},
+        .capture = {
+                .stream_name = "AC97 Aux Capture",
+                .channels_min = 1,
+                .channels_max = 1,},
+        .ops = {
+                .hw_params = pxa2xx_ac97_hw_aux_params,},
+        .caps = {
+                .num_modes = ARRAY_SIZE(pxa2xx_ac97_modes),
+                .mode = pxa2xx_ac97_modes,},
+},
+{
+        .name = "pxa2xx-ac97-mic",
+        .id = 2,
+        .type = SND_SOC_DAI_AC97,
+        .capture = {
+                .stream_name = "AC97 Mic Capture",
+                .channels_min = 1,
+                .channels_max = 1,},
+        .ops = {
+                .hw_params = pxa2xx_ac97_hw_mic_params,},
+        .caps = {
+                .num_modes = ARRAY_SIZE(pxa2xx_ac97_modes),
+                .mode = pxa2xx_ac97_modes,},},
+};
+
+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");