--- /dev/null
+/*
+ * pxa2xx-i2s.c -- ALSA Soc Audio Layer
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ * lrg@slimlogic.co.uk
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <sound/pxa2xx-lib.h>
+#include <sound/dmaengine_pcm.h>
+
+#include <mach/hardware.h>
+#include <mach/audio.h>
+
+#include "pxa2xx-i2s.h"
+
+/*
+ * I2S Controller Register and Bit Definitions
+ */
+#define SACR0 __REG(0x40400000) /* Global Control Register */
+#define SACR1 __REG(0x40400004) /* Serial Audio I 2 S/MSB-Justified Control Register */
+#define SASR0 __REG(0x4040000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */
+#define SAIMR __REG(0x40400014) /* Serial Audio Interrupt Mask Register */
+#define SAICR __REG(0x40400018) /* Serial Audio Interrupt Clear Register */
+#define SADIV __REG(0x40400060) /* Audio Clock Divider Register. */
+#define SADR __REG(0x40400080) /* Serial Audio Data Register (TX and RX FIFO access Register). */
+
+#define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */
+#define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */
+#define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */
+#define SACR0_EFWR (1 << 4) /* Enable EFWR Function */
+#define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */
+#define SACR0_BCKD (1 << 2) /* Bit Clock Direction */
+#define SACR0_ENB (1 << 0) /* Enable I2S Link */
+#define SACR1_ENLBF (1 << 5) /* Enable Loopback */
+#define SACR1_DRPL (1 << 4) /* Disable Replaying Function */
+#define SACR1_DREC (1 << 3) /* Disable Recording Function */
+#define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */
+
+#define SASR0_I2SOFF (1 << 7) /* Controller Status */
+#define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */
+#define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */
+#define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */
+#define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */
+#define SASR0_BSY (1 << 2) /* I2S Busy */
+#define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */
+#define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */
+
+#define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */
+#define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */
+
+#define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */
+#define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */
+#define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */
+#define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */
+
+struct pxa_i2s_port {
+ u32 sadiv;
+ u32 sacr0;
+ u32 sacr1;
+ u32 saimr;
+ int master;
+ u32 fmt;
+};
+static struct pxa_i2s_port pxa_i2s;
+static struct clk *clk_i2s;
+static int clk_ena = 0;
+
+static unsigned long pxa2xx_i2s_pcm_stereo_out_req = 3;
+static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_out = {
+ .addr = __PREG(SADR),
+ .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .maxburst = 32,
+ .filter_data = &pxa2xx_i2s_pcm_stereo_out_req,
+};
+
+static unsigned long pxa2xx_i2s_pcm_stereo_in_req = 2;
+static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_in = {
+ .addr = __PREG(SADR),
+ .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .maxburst = 32,
+ .filter_data = &pxa2xx_i2s_pcm_stereo_in_req,
+};
+
+static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+ if (IS_ERR(clk_i2s))
+ return PTR_ERR(clk_i2s);
+
+ if (!cpu_dai->active)
+ 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_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ /* interface format */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ pxa_i2s.fmt = 0;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ pxa_i2s.fmt = SACR1_AMSL;
+ break;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ pxa_i2s.master = 1;
+ break;
+ case SND_SOC_DAIFMT_CBM_CFS:
+ pxa_i2s.master = 0;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ if (clk_id != PXA2XX_I2S_SYSCLK)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_dmaengine_dai_dma_data *dma_data;
+
+ if (WARN_ON(IS_ERR(clk_i2s)))
+ return -EINVAL;
+ clk_prepare_enable(clk_i2s);
+ clk_ena = 1;
+ pxa_i2s_wait();
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dma_data = &pxa2xx_i2s_pcm_stereo_out;
+ else
+ dma_data = &pxa2xx_i2s_pcm_stereo_in;
+
+ snd_soc_dai_set_dma_data(dai, substream, dma_data);
+
+ /* is port used by another stream */
+ if (!(SACR0 & SACR0_ENB)) {
+ SACR0 = 0;
+ if (pxa_i2s.master)
+ SACR0 |= SACR0_BCKD;
+
+ SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
+ SACR1 |= pxa_i2s.fmt;
+ }
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ SAIMR |= SAIMR_TFS;
+ else
+ SAIMR |= SAIMR_RFS;
+
+ switch (params_rate(params)) {
+ case 8000:
+ SADIV = 0x48;
+ break;
+ case 11025:
+ SADIV = 0x34;
+ break;
+ case 16000:
+ SADIV = 0x24;
+ break;
+ case 22050:
+ SADIV = 0x1a;
+ break;
+ case 44100:
+ SADIV = 0xd;
+ break;
+ case 48000:
+ SADIV = 0xc;
+ break;
+ case 96000: /* not in manual and possibly slightly inaccurate */
+ SADIV = 0x6;
+ break;
+ }
+
+ return 0;
+}
+
+static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ SACR1 &= ~SACR1_DRPL;
+ else
+ SACR1 &= ~SACR1_DREC;
+ 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,
+ struct snd_soc_dai *dai)
+{
+ 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)) == (SACR1_DREC | SACR1_DRPL)) {
+ SACR0 &= ~SACR0_ENB;
+ pxa_i2s_wait();
+ if (clk_ena) {
+ clk_disable_unprepare(clk_i2s);
+ clk_ena = 0;
+ }
+ }
+}
+
+#ifdef CONFIG_PM
+static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai)
+{
+ /* 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 snd_soc_dai *dai)
+{
+ pxa_i2s_wait();
+
+ SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB;
+ SACR1 = pxa_i2s.sacr1;
+ SAIMR = pxa_i2s.saimr;
+ SADIV = pxa_i2s.sadiv;
+
+ SACR0 = pxa_i2s.sacr0;
+
+ return 0;
+}
+
+#else
+#define pxa2xx_i2s_suspend NULL
+#define pxa2xx_i2s_resume NULL
+#endif
+
+static int pxa2xx_i2s_probe(struct snd_soc_dai *dai)
+{
+ clk_i2s = clk_get(dai->dev, "I2SCLK");
+ if (IS_ERR(clk_i2s))
+ return PTR_ERR(clk_i2s);
+
+ /*
+ * PXA Developer's Manual:
+ * If SACR0[ENB] is toggled in the middle of a normal operation,
+ * the SACR0[RST] bit must also be set and cleared to reset all
+ * I2S controller registers.
+ */
+ SACR0 = SACR0_RST;
+ SACR0 = 0;
+ /* Make sure RPL and REC are disabled */
+ SACR1 = SACR1_DRPL | SACR1_DREC;
+ /* Along with FIFO servicing */
+ SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
+
+ return 0;
+}
+
+static int pxa2xx_i2s_remove(struct snd_soc_dai *dai)
+{
+ clk_put(clk_i2s);
+ clk_i2s = ERR_PTR(-ENOENT);
+ return 0;
+}
+
+#define PXA2XX_I2S_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 | SNDRV_PCM_RATE_96000)
+
+static const struct snd_soc_dai_ops pxa_i2s_dai_ops = {
+ .startup = pxa2xx_i2s_startup,
+ .shutdown = pxa2xx_i2s_shutdown,
+ .trigger = pxa2xx_i2s_trigger,
+ .hw_params = pxa2xx_i2s_hw_params,
+ .set_fmt = pxa2xx_i2s_set_dai_fmt,
+ .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
+};
+
+static struct snd_soc_dai_driver pxa_i2s_dai = {
+ .probe = pxa2xx_i2s_probe,
+ .remove = pxa2xx_i2s_remove,
+ .suspend = pxa2xx_i2s_suspend,
+ .resume = pxa2xx_i2s_resume,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = PXA2XX_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = PXA2XX_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+ .ops = &pxa_i2s_dai_ops,
+ .symmetric_rates = 1,
+};
+
+static const struct snd_soc_component_driver pxa_i2s_component = {
+ .name = "pxa-i2s",
+};
+
+static int pxa2xx_i2s_drv_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_component(&pdev->dev, &pxa_i2s_component,
+ &pxa_i2s_dai, 1);
+}
+
+static int pxa2xx_i2s_drv_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_component(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver pxa2xx_i2s_driver = {
+ .probe = pxa2xx_i2s_drv_probe,
+ .remove = pxa2xx_i2s_drv_remove,
+
+ .driver = {
+ .name = "pxa2xx-i2s",
+ },
+};
+
+static int __init pxa2xx_i2s_init(void)
+{
+ clk_i2s = ERR_PTR(-ENOENT);
+ return platform_driver_register(&pxa2xx_i2s_driver);
+}
+
+static void __exit pxa2xx_i2s_exit(void)
+{
+ platform_driver_unregister(&pxa2xx_i2s_driver);
+}
+
+module_init(pxa2xx_i2s_init);
+module_exit(pxa2xx_i2s_exit);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
+MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-i2s");
Code Review / kvmfornfv.git / blobdiff