ALSA: ASoC: Au12x0/Au1550 PSC Audio support

Audio for Au12x0/Au1550 PSCs in AC97 and I2S mode, for ASoC v1 framework.

- DBDMA, AC97 and I2S drivers
- sample AC97 machine code (Db1200)

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 387 insertions, 0 deletions

diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
new file mode 100644
index 000000000000..57facbad6825
--- /dev/null
+++ b/sound/soc/au1x/psc-ac97.c
@@ -0,0 +1,387 @@
+/*
+ * Au12x0/Au1550 PSC ALSA ASoC audio support.
+ *
+ * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
+ *      Manuel Lauss <mano@roarinelk.homelinux.net>
+ *
+ * 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.
+ *
+ * Au1xxx-PSC AC97 glue.
+ *
+ * NOTE: all of these drivers can only work with a SINGLE instance
+ *       of a PSC. Multiple independent audio devices are impossible
+ *       with ASoC v1.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/suspend.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1xxx_psc.h>
+
+#include "psc.h"
+
+#define AC97_DIR        \
+        (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define AC97_RATES      \
+        SNDRV_PCM_RATE_8000_48000
+
+#define AC97_FMTS       \
+        (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
+
+#define AC97PCR_START(stype)    \
+        ((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
+#define AC97PCR_STOP(stype)     \
+        ((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
+#define AC97PCR_CLRFIFO(stype)  \
+        ((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
+
+/* instance data. There can be only one, MacLeod!!!! */
+static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
+
+/* AC97 controller reads codec register */
+static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
+                                        unsigned short reg)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+        unsigned short data, tmo;
+
+        au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), AC97_CDC(pscdata));
+        au_sync();
+
+        tmo = 1000;
+        while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
+                udelay(2);
+
+        if (!tmo)
+                data = 0xffff;
+        else
+                data = au_readl(AC97_CDC(pscdata)) & 0xffff;
+
+        au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+        au_sync();
+
+        return data;
+}
+
+/* AC97 controller writes to codec register */
+static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+                                unsigned short val)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+        unsigned int tmo;
+
+        au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), AC97_CDC(pscdata));
+        au_sync();
+        tmo = 1000;
+        while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
+                au_sync();
+
+        au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+        au_sync();
+}
+
+/* AC97 controller asserts a warm reset */
+static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+
+        au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
+        au_sync();
+        msleep(10);
+        au_writel(0, AC97_RST(pscdata));
+        au_sync();
+}
+
+static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+        int i;
+
+        /* disable PSC during cold reset */
+        au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+        au_sync();
+        au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
+        au_sync();
+
+        /* issue cold reset */
+        au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
+        au_sync();
+        msleep(500);
+        au_writel(0, AC97_RST(pscdata));
+        au_sync();
+
+        /* enable PSC */
+        au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
+        au_sync();
+
+        /* wait for PSC to indicate it's ready */
+        i = 100000;
+        while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
+                au_sync();
+
+        if (i == 0) {
+                printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
+                return;
+        }
+
+        /* enable the ac97 function */
+        au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+        au_sync();
+
+        /* wait for AC97 core to become ready */
+        i = 100000;
+        while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
+                au_sync();
+        if (i == 0)
+                printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
+}
+
+/* AC97 controller operations */
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read           = au1xpsc_ac97_read,
+        .write          = au1xpsc_ac97_write,
+        .reset          = au1xpsc_ac97_cold_reset,
+        .warm_reset     = au1xpsc_ac97_warm_reset,
+};
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
+                                  struct snd_pcm_hw_params *params)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+        unsigned long r, stat;
+        int chans, stype = SUBSTREAM_TYPE(substream);
+
+        chans = params_channels(params);
+
+        r = au_readl(AC97_CFG(pscdata));
+        stat = au_readl(AC97_STAT(pscdata));
+
+        /* already active? */
+        if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
+                /* reject parameters not currently set up */
+                if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
+                    (pscdata->rate != params_rate(params)))
+                        return -EINVAL;
+        } else {
+                /* disable AC97 device controller first */
+                au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+                au_sync();
+
+                /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
+                r &= ~PSC_AC97CFG_LEN_MASK;
+                r |= PSC_AC97CFG_SET_LEN(params->msbits);
+
+                /* channels: enable slots for front L/R channel */
+                if (stype == PCM_TX) {
+                        r &= ~PSC_AC97CFG_TXSLOT_MASK;
+                        r |= PSC_AC97CFG_TXSLOT_ENA(3);
+                        r |= PSC_AC97CFG_TXSLOT_ENA(4);
+                } else {
+                        r &= ~PSC_AC97CFG_RXSLOT_MASK;
+                        r |= PSC_AC97CFG_RXSLOT_ENA(3);
+                        r |= PSC_AC97CFG_RXSLOT_ENA(4);
+                }
+
+                /* finally enable the AC97 controller again */
+                au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+                au_sync();
+
+                pscdata->cfg = r;
+                pscdata->rate = params_rate(params);
+        }
+
+        return 0;
+}
+
+static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
+                                int cmd)
+{
+        /* FIXME */
+        struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+        int ret, stype = SUBSTREAM_TYPE(substream);
+
+        ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+                au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
+                au_sync();
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
+                au_sync();
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        return ret;
+}
+
+static int au1xpsc_ac97_probe(struct platform_device *pdev,
+                              struct snd_soc_dai *dai)
+{
+        int ret;
+        struct resource *r;
+        unsigned long sel;
+
+        if (au1xpsc_ac97_workdata)
+                return -EBUSY;
+
+        au1xpsc_ac97_workdata =
+                kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
+        if (!au1xpsc_ac97_workdata)
+                return -ENOMEM;
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!r) {
+                ret = -ENODEV;
+                goto out0;
+        }
+
+        ret = -EBUSY;
+        au1xpsc_ac97_workdata->ioarea =
+                request_mem_region(r->start, r->end - r->start + 1,
+                                        "au1xpsc_ac97");
+        if (!au1xpsc_ac97_workdata->ioarea)
+                goto out0;
+
+        au1xpsc_ac97_workdata->mmio = ioremap(r->start, 0xffff);
+        if (!au1xpsc_ac97_workdata->mmio)
+                goto out1;
+
+        /* configuration: max dma trigger threshold, enable ac97 */
+         au1xpsc_ac97_workdata->cfg = PSC_AC97CFG_RT_FIFO8 |
+                                      PSC_AC97CFG_TT_FIFO8 |
+                                      PSC_AC97CFG_DE_ENABLE;
+
+        /* preserve PSC clock source set up by platform (dev.platform_data
+         * is already occupied by soc layer)
+         */
+        sel = au_readl(PSC_SEL(au1xpsc_ac97_workdata)) & PSC_SEL_CLK_MASK;
+        au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+        au_sync();
+        au_writel(0, PSC_SEL(au1xpsc_ac97_workdata));
+        au_sync();
+        au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(au1xpsc_ac97_workdata));
+        au_sync();
+        /* next up: cold reset.  Dont check for PSC-ready now since
+         * there may not be any codec clock yet.
+         */
+
+        return 0;
+
+out1:
+        release_resource(au1xpsc_ac97_workdata->ioarea);
+        kfree(au1xpsc_ac97_workdata->ioarea);
+out0:
+        kfree(au1xpsc_ac97_workdata);
+        au1xpsc_ac97_workdata = NULL;
+        return ret;
+}
+
+static void au1xpsc_ac97_remove(struct platform_device *pdev,
+                                struct snd_soc_dai *dai)
+{
+        /* disable PSC completely */
+        au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+        au_sync();
+        au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+        au_sync();
+
+        iounmap(au1xpsc_ac97_workdata->mmio);
+        release_resource(au1xpsc_ac97_workdata->ioarea);
+        kfree(au1xpsc_ac97_workdata->ioarea);
+        kfree(au1xpsc_ac97_workdata);
+        au1xpsc_ac97_workdata = NULL;
+}
+
+static int au1xpsc_ac97_suspend(struct platform_device *pdev,
+                                struct snd_soc_dai *dai)
+{
+        /* save interesting registers and disable PSC */
+        au1xpsc_ac97_workdata->pm[0] =
+                        au_readl(PSC_SEL(au1xpsc_ac97_workdata));
+
+        au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+        au_sync();
+        au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+        au_sync();
+
+        return 0;
+}
+
+static int au1xpsc_ac97_resume(struct platform_device *pdev,
+                               struct snd_soc_dai *dai)
+{
+        /* restore PSC clock config */
+        au_writel(au1xpsc_ac97_workdata->pm[0] | PSC_SEL_PS_AC97MODE,
+                        PSC_SEL(au1xpsc_ac97_workdata));
+        au_sync();
+
+        /* after this point the ac97 core will cold-reset the codec.
+         * During cold-reset the PSC is reinitialized and the last
+         * configuration set up in hw_params() is restored.
+         */
+        return 0;
+}
+
+struct snd_soc_dai au1xpsc_ac97_dai = {
+        .name                   = "au1xpsc_ac97",
+        .type                   = SND_SOC_DAI_AC97,
+        .probe                  = au1xpsc_ac97_probe,
+        .remove                 = au1xpsc_ac97_remove,
+        .suspend                = au1xpsc_ac97_suspend,
+        .resume                 = au1xpsc_ac97_resume,
+        .playback = {
+                .rates          = AC97_RATES,
+                .formats        = AC97_FMTS,
+                .channels_min   = 2,
+                .channels_max   = 2,
+        },
+        .capture = {
+                .rates          = AC97_RATES,
+                .formats        = AC97_FMTS,
+                .channels_min   = 2,
+                .channels_max   = 2,
+        },
+        .ops = {
+                .trigger        = au1xpsc_ac97_trigger,
+                .hw_params      = au1xpsc_ac97_hw_params,
+        },
+};
+EXPORT_SYMBOL_GPL(au1xpsc_ac97_dai);
+
+static int __init au1xpsc_ac97_init(void)
+{
+        au1xpsc_ac97_workdata = NULL;
+        return 0;
+}
+
+static void __exit au1xpsc_ac97_exit(void)
+{
+}
+
+module_init(au1xpsc_ac97_init);
+module_exit(au1xpsc_ac97_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
+MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");