[ALSA] ASoC pxa2xx I2S support
This patch adds pxa2xx I2S ASoC audio support. Features:-
o Supports playback/capture
o 16 bit PCM
o 8k - 96k sample rates
o Supports master and slave mode.
From: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
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>
diff --git a/sound/soc/pxa/pxa2xx-i2s.c b/sound/soc/pxa/pxa2xx-i2s.c
new file mode 100644
index 0000000..c3b7a4b
--- /dev/null
+++ b/sound/soc/pxa/pxa2xx-i2s.c
@@ -0,0 +1,306 @@
+/*
+ * pxa2xx-i2s.c -- ALSA Soc Audio Layer
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Revision history
+ * 12th Aug 2005 Initial version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/audio.h>
+
+#include "pxa2xx-pcm.h"
+
+/* used to disable sysclk if external crystal is used */
+static int extclk;
+module_param(extclk, int, 0);
+MODULE_PARM_DESC(extclk, "set to 1 to disable pxa2xx i2s sysclk");
+
+struct pxa_i2s_port {
+ u32 sadiv;
+ u32 sacr0;
+ u32 sacr1;
+ u32 saimr;
+ int master;
+};
+static struct pxa_i2s_port pxa_i2s;
+
+#define PXA_I2S_DAIFMT \
+ (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF)
+
+#define PXA_I2S_DIR \
+ (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define PXA_I2S_RATES \
+ (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+
+/* priv is divider */
+static struct snd_soc_dai_mode pxa2xx_i2s_modes[] = {
+ /* pxa2xx I2S frame and clock master modes */
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_8000, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x48},
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_11025, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x34},
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_16000, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x24},
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_22050, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x1a},
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_44100, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0xd},
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_48000, PXA_I2S_DIR,
+ SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0xc},
+
+ /* pxa2xx I2S frame master and clock slave mode */
+ {PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBM_CFS, SND_SOC_DAITDM_LRDW(0,0),
+ SNDRV_PCM_FMTBIT_S16_LE, PXA_I2S_RATES, PXA_I2S_DIR, 0,
+ SND_SOC_FS_ALL, SND_SOC_FSB(64), 0x48},
+
+};
+
+static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
+ .name = "I2S PCM Stereo out",
+ .dev_addr = __PREG(SADR),
+ .drcmr = &DRCMRTXSADR,
+ .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
+ DCMD_BURST32 | DCMD_WIDTH4,
+};
+
+static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
+ .name = "I2S PCM Stereo in",
+ .dev_addr = __PREG(SADR),
+ .drcmr = &DRCMRRXSADR,
+ .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
+ DCMD_BURST32 | DCMD_WIDTH4,
+};
+
+static struct pxa2xx_gpio gpio_bus[] = {
+ { /* I2S SoC Slave */
+ .rx = GPIO29_SDATA_IN_I2S_MD,
+ .tx = GPIO30_SDATA_OUT_I2S_MD,
+ .clk = GPIO28_BITCLK_IN_I2S_MD,
+ .frm = GPIO31_SYNC_I2S_MD,
+ },
+ { /* I2S SoC Master */
+#ifdef CONFIG_PXA27x
+ .sys = GPIO113_I2S_SYSCLK_MD,
+#else
+ .sys = GPIO32_SYSCLK_I2S_MD,
+#endif
+ .rx = GPIO29_SDATA_IN_I2S_MD,
+ .tx = GPIO30_SDATA_OUT_I2S_MD,
+ .clk = GPIO28_BITCLK_OUT_I2S_MD,
+ .frm = GPIO31_SYNC_I2S_MD,
+ },
+};
+
+static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ if (!rtd->cpu_dai->active) {
+ SACR0 |= SACR0_RST;
+ SACR0 = 0;
+ }
+
+ return 0;
+}
+
+/* wait for I2S controller to be ready */
+static int pxa_i2s_wait(void)
+{
+ int i;
+
+ /* flush the Rx FIFO */
+ for(i = 0; i < 16; i++)
+ SADR;
+ return 0;
+}
+
+static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ pxa_i2s.master = 0;
+ if (rtd->cpu_dai->dai_runtime.fmt & SND_SOC_DAIFMT_CBS_CFS)
+ pxa_i2s.master = 1;
+
+ if (pxa_i2s.master && !extclk)
+ pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);
+
+ pxa_gpio_mode(gpio_bus[pxa_i2s.master].rx);
+ pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
+ pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
+ pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
+ pxa_set_cken(CKEN8_I2S, 1);
+ pxa_i2s_wait();
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ rtd->cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
+ else
+ rtd->cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;
+
+ /* is port used by another stream */
+ if (!(SACR0 & SACR0_ENB)) {
+
+ SACR0 = 0;
+ SACR1 = 0;
+ if (pxa_i2s.master)
+ SACR0 |= SACR0_BCKD;
+
+ SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
+
+ if (rtd->cpu_dai->dai_runtime.fmt & SND_SOC_DAIFMT_LEFT_J)
+ SACR1 |= SACR1_AMSL;
+ }
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ SAIMR |= SAIMR_TFS;
+ else
+ SAIMR |= SAIMR_RFS;
+
+ SADIV = rtd->cpu_dai->dai_runtime.priv;
+ return 0;
+}
+
+static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ SACR0 |= SACR0_ENB;
+ break;
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream)
+{
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ SACR1 |= SACR1_DRPL;
+ SAIMR &= ~SAIMR_TFS;
+ } else {
+ SACR1 |= SACR1_DREC;
+ SAIMR &= ~SAIMR_RFS;
+ }
+
+ if (SACR1 & (SACR1_DREC | SACR1_DRPL)) {
+ SACR0 &= ~SACR0_ENB;
+ pxa_i2s_wait();
+ pxa_set_cken(CKEN8_I2S, 0);
+ }
+}
+
+#ifdef CONFIG_PM
+static int pxa2xx_i2s_suspend(struct platform_device *dev,
+ struct snd_soc_cpu_dai *dai)
+{
+ if (!dai->active)
+ return 0;
+
+ /* store registers */
+ pxa_i2s.sacr0 = SACR0;
+ pxa_i2s.sacr1 = SACR1;
+ pxa_i2s.saimr = SAIMR;
+ pxa_i2s.sadiv = SADIV;
+
+ /* deactivate link */
+ SACR0 &= ~SACR0_ENB;
+ pxa_i2s_wait();
+ return 0;
+}
+
+static int pxa2xx_i2s_resume(struct platform_device *pdev,
+ struct snd_soc_cpu_dai *dai)
+{
+ if (!dai->active)
+ return 0;
+
+ pxa_i2s_wait();
+
+ SACR0 = pxa_i2s.sacr0 &= ~SACR0_ENB;
+ SACR1 = pxa_i2s.sacr1;
+ SAIMR = pxa_i2s.saimr;
+ SADIV = pxa_i2s.sadiv;
+ SACR0 |= SACR0_ENB;
+
+ return 0;
+}
+
+#else
+#define pxa2xx_i2s_suspend NULL
+#define pxa2xx_i2s_resume NULL
+#endif
+
+/* pxa2xx I2S sysclock is always 256 FS */
+static unsigned int pxa_i2s_config_sysclk(struct snd_soc_cpu_dai *iface,
+ struct snd_soc_clock_info *info, unsigned int clk)
+{
+ return info->rate << 8;
+}
+
+struct snd_soc_cpu_dai pxa_i2s_dai = {
+ .name = "pxa2xx-i2s",
+ .id = 0,
+ .type = SND_SOC_DAI_I2S,
+ .suspend = pxa2xx_i2s_suspend,
+ .resume = pxa2xx_i2s_resume,
+ .config_sysclk = pxa_i2s_config_sysclk,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,},
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,},
+ .ops = {
+ .startup = pxa2xx_i2s_startup,
+ .shutdown = pxa2xx_i2s_shutdown,
+ .trigger = pxa2xx_i2s_trigger,
+ .hw_params = pxa2xx_i2s_hw_params,},
+ .caps = {
+ .num_modes = ARRAY_SIZE(pxa2xx_i2s_modes),
+ .mode = pxa2xx_i2s_modes,},
+};
+
+EXPORT_SYMBOL_GPL(pxa_i2s_dai);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
+MODULE_LICENSE("GPL");