[PATCH 2/3] EP93xx: Add i2s audio driver
Ryan Mallon
ryan at bluewatersys.com
Tue Jun 8 06:01:11 EDT 2010
Add pcm and i2s SoC audio drivers for EP93xx
Signed-off-by: Ryan Mallon <ryan at bluewatersys.com>
---
sound/soc/Kconfig | 1 +
sound/soc/Makefile | 1 +
sound/soc/ep93xx/Kconfig | 9 +
sound/soc/ep93xx/Makefile | 8 +
sound/soc/ep93xx/ep93xx-i2s.c | 487 +++++++++++++++++++++++++++++++++++++++++
sound/soc/ep93xx/ep93xx-i2s.h | 18 ++
sound/soc/ep93xx/ep93xx-pcm.c | 319 +++++++++++++++++++++++++++
sound/soc/ep93xx/ep93xx-pcm.h | 22 ++
8 files changed, 865 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/ep93xx/Kconfig
create mode 100644 sound/soc/ep93xx/Makefile
create mode 100644 sound/soc/ep93xx/ep93xx-i2s.c
create mode 100644 sound/soc/ep93xx/ep93xx-i2s.h
create mode 100644 sound/soc/ep93xx/ep93xx-pcm.c
create mode 100644 sound/soc/ep93xx/ep93xx-pcm.h
diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index b1749bc..f7cb451 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -28,6 +28,7 @@ source "sound/soc/atmel/Kconfig"
source "sound/soc/au1x/Kconfig"
source "sound/soc/blackfin/Kconfig"
source "sound/soc/davinci/Kconfig"
+source "sound/soc/ep93xx/Kconfig"
source "sound/soc/fsl/Kconfig"
source "sound/soc/imx/Kconfig"
source "sound/soc/omap/Kconfig"
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 1470141..55b711a 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_SND_SOC) += atmel/
obj-$(CONFIG_SND_SOC) += au1x/
obj-$(CONFIG_SND_SOC) += blackfin/
obj-$(CONFIG_SND_SOC) += davinci/
+obj-$(CONFIG_SND_SOC) += ep93xx/
obj-$(CONFIG_SND_SOC) += fsl/
obj-$(CONFIG_SND_SOC) += imx/
obj-$(CONFIG_SND_SOC) += omap/
diff --git a/sound/soc/ep93xx/Kconfig b/sound/soc/ep93xx/Kconfig
new file mode 100644
index 0000000..ba66ac8
--- /dev/null
+++ b/sound/soc/ep93xx/Kconfig
@@ -0,0 +1,9 @@
+config SND_EP93XX_SOC
+ tristate "SoC Audio support for the Cirrus Logic EP93xx series"
+ depends on ARCH_EP93XX && SND_SOC
+ help
+ Say Y or M if you want to add support for codecs attached to
+ the EP93xx I2S interface.
+
+config SND_EP93XX_SOC_I2S
+ tristate
diff --git a/sound/soc/ep93xx/Makefile b/sound/soc/ep93xx/Makefile
new file mode 100644
index 0000000..0239da3
--- /dev/null
+++ b/sound/soc/ep93xx/Makefile
@@ -0,0 +1,8 @@
+# EP93xx Platform Support
+snd-soc-ep93xx-objs := ep93xx-pcm.o
+snd-soc-ep93xx-i2s-objs := ep93xx-i2s.o
+
+obj-$(CONFIG_SND_EP93XX_SOC) += snd-soc-ep93xx.o
+obj-$(CONFIG_SND_EP93XX_SOC_I2S) += snd-soc-ep93xx-i2s.o
+
+# EP93XX Machine Support
diff --git a/sound/soc/ep93xx/ep93xx-i2s.c b/sound/soc/ep93xx/ep93xx-i2s.c
new file mode 100644
index 0000000..00b9466
--- /dev/null
+++ b/sound/soc/ep93xx/ep93xx-i2s.c
@@ -0,0 +1,487 @@
+/*
+ * linux/sound/soc/ep93xx-i2s.c
+ * EP93xx I2S driver
+ *
+ * Copyright (C) 2010 Ryan Mallon <ryan at bluewatersys.com>
+ *
+ * Based on the original driver by:
+ * Copyright (C) 2007 Chase Douglas <chasedouglas at gmail>
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh at wantstofly.org>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <mach/hardware.h>
+#include <mach/ep93xx-regs.h>
+#include <mach/dma.h>
+
+#include "ep93xx-pcm.h"
+#include "ep93xx-i2s.h"
+
+#define EP93XX_I2S_TXCLKCFG 0x00
+#define EP93XX_I2S_RXCLKCFG 0x04
+#define EP93XX_I2S_GLCTRL 0x0C
+
+#define EP93XX_I2S_TXLINCTRLDATA 0x28
+#define EP93XX_I2S_TXCTRL 0x2C
+#define EP93XX_I2S_TXWRDLEN 0x30
+#define EP93XX_I2S_TX0EN 0x34
+
+#define EP93XX_I2S_RXLINCTRLDATA 0x58
+#define EP93XX_I2S_RXCTRL 0x5C
+#define EP93XX_I2S_RXWRDLEN 0x60
+#define EP93XX_I2S_RX0EN 0x64
+
+#define EP93XX_I2S_WRDLEN_16 (0 << 0)
+#define EP93XX_I2S_WRDLEN_24 (1 << 0)
+#define EP93XX_I2S_WRDLEN_32 (2 << 0)
+
+#define EP93XX_I2S_LINCTRLDATA_R_JUST (1 << 2) /* Right justify */
+
+#define EP93XX_I2S_CLKCFG_LRS (1 << 0) /* lrclk polarity */
+#define EP93XX_I2S_CLKCFG_CKP (1 << 1) /* Bit clock polarity */
+#define EP93XX_I2S_CLKCFG_REL (1 << 2) /* First bit transition */
+#define EP93XX_I2S_CLKCFG_MASTER (1 << 3) /* Master mode */
+#define EP93XX_I2S_CLKCFG_NBCG (1 << 4) /* Not bit clock gating */
+
+struct ep93xx_i2s_info {
+ struct clk *mclk;
+ struct clk *sclk;
+ struct clk *lrclk;
+ struct ep93xx_pcm_dma_params *dma_params;
+ struct resource *mem;
+ void __iomem *regs;
+};
+
+struct ep93xx_pcm_dma_params ep93xx_i2s_dma_params[] = {
+ [SNDRV_PCM_STREAM_PLAYBACK] = {
+ .name = "i2s-pcm-out",
+ .dma_port = EP93XX_DMA_M2P_PORT_I2S1,
+ },
+ [SNDRV_PCM_STREAM_CAPTURE] = {
+ .name = "i2s-pcm-in",
+ .dma_port = EP93XX_DMA_M2P_PORT_I2S1,
+ },
+};
+
+static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info,
+ unsigned reg, unsigned val)
+{
+ __raw_writel(val, info->regs + reg);
+}
+
+static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info,
+ unsigned reg)
+{
+ return __raw_readl(info->regs + reg);
+}
+
+static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream)
+{
+ unsigned base_reg;
+ int i;
+
+ if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
+ (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
+ /* Enable clocks */
+ clk_enable(info->mclk);
+ clk_enable(info->sclk);
+ clk_enable(info->lrclk);
+
+ /* Enable i2s */
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1);
+ }
+
+ /* Enable fifos */
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ base_reg = EP93XX_I2S_TX0EN;
+ else
+ base_reg = EP93XX_I2S_RX0EN;
+ for (i = 0; i < 3; i++)
+ ep93xx_i2s_write_reg(info, base_reg + (i * 4), 1);
+}
+
+static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream)
+{
+ unsigned base_reg;
+ int i;
+
+ /* Disable fifos */
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ base_reg = EP93XX_I2S_TX0EN;
+ else
+ base_reg = EP93XX_I2S_RX0EN;
+ for (i = 0; i < 3; i++)
+ ep93xx_i2s_write_reg(info, base_reg + (i * 4), 0);
+
+ if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
+ (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
+ /* Disable i2s */
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0);
+
+ /* Disable clocks */
+ clk_disable(info->lrclk);
+ clk_disable(info->sclk);
+ clk_disable(info->mclk);
+ }
+}
+
+static int ep93xx_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->dai->cpu_dai;
+ struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data;
+
+ snd_soc_dai_set_dma_data(cpu_dai, substream,
+ &info->dma_params[substream->stream]);
+ return 0;
+}
+
+static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data;
+
+ ep93xx_i2s_disable(info, substream->stream);
+}
+
+static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct ep93xx_i2s_info *info = cpu_dai->private_data;
+ unsigned int clk_cfg, lin_ctrl;
+
+ clk_cfg = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXCLKCFG);
+ lin_ctrl = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXLINCTRLDATA);
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ clk_cfg |= EP93XX_I2S_CLKCFG_REL;
+ lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
+ break;
+
+ case SND_SOC_DAIFMT_LEFT_J:
+ clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
+ lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
+ break;
+
+ case SND_SOC_DAIFMT_RIGHT_J:
+ clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
+ lin_ctrl |= EP93XX_I2S_LINCTRLDATA_R_JUST;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ /* CPU is master */
+ clk_cfg |= EP93XX_I2S_CLKCFG_MASTER;
+ break;
+
+ case SND_SOC_DAIFMT_CBM_CFM:
+ /* Codec is master */
+ clk_cfg &= ~EP93XX_I2S_CLKCFG_MASTER;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ /* Negative bit clock, lrclk low on left word */
+ clk_cfg &= ~(EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL);
+ break;
+
+ case SND_SOC_DAIFMT_NB_IF:
+ /* Negative bit clock, lrclk low on right word */
+ clk_cfg &= ~EP93XX_I2S_CLKCFG_CKP;
+ clk_cfg |= EP93XX_I2S_CLKCFG_REL;
+ break;
+
+ case SND_SOC_DAIFMT_IB_NF:
+ /* Positive bit clock, lrclk low on left word */
+ clk_cfg |= EP93XX_I2S_CLKCFG_CKP;
+ clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
+ break;
+
+ case SND_SOC_DAIFMT_IB_IF:
+ /* Positive bit clock, lrclk low on right word */
+ clk_cfg |= EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL;
+ break;
+ }
+
+ /* Write new register values */
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_RXCLKCFG, clk_cfg);
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_TXCLKCFG, clk_cfg);
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_RXLINCTRLDATA, lin_ctrl);
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_TXLINCTRLDATA, lin_ctrl);
+ return 0;
+}
+
+static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+ struct ep93xx_i2s_info *info = cpu_dai->private_data;
+ unsigned word_len, div, sdiv, lrdiv;
+ int found = 0, err;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ word_len = EP93XX_I2S_WRDLEN_16;
+ break;
+
+ case SNDRV_PCM_FORMAT_S24_LE:
+ word_len = EP93XX_I2S_WRDLEN_24;
+ break;
+
+ case SNDRV_PCM_FORMAT_S32_LE:
+ word_len = EP93XX_I2S_WRDLEN_32;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_TXWRDLEN, word_len);
+ else
+ ep93xx_i2s_write_reg(info, EP93XX_I2S_RXWRDLEN, word_len);
+
+ /*
+ * Calculate the sdiv (bit clock) and lrdiv (left/right clock) values.
+ * If the lrclk is pulse length is larger than the word size, then the
+ * bit clock will be gated for the unused bits.
+ */
+ div = (clk_get_rate(info->mclk) / params_rate(params)) *
+ params_channels(params);
+ for (sdiv = 2; sdiv <= 4; sdiv += 2)
+ for (lrdiv = 32; lrdiv <= 128; lrdiv <<= 1)
+ if (sdiv * lrdiv == div) {
+ found = 1;
+ goto out;
+ }
+out:
+ if (!found)
+ return -EINVAL;
+
+ err = clk_set_rate(info->sclk, clk_get_rate(info->mclk) / sdiv);
+ if (err)
+ return err;
+
+ err = clk_set_rate(info->lrclk, clk_get_rate(info->sclk) / lrdiv);
+ if (err)
+ return err;
+
+ ep93xx_i2s_enable(info, substream->stream);
+ return 0;
+}
+
+static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
+ unsigned int freq, int dir)
+{
+ struct ep93xx_i2s_info *info = cpu_dai->private_data;
+
+ if (dir == SND_SOC_CLOCK_IN || clk_id != 0)
+ return -EINVAL;
+
+ return clk_set_rate(info->mclk, freq);
+}
+
+#ifdef CONFIG_PM
+static int ep93xx_i2s_suspend(struct snd_soc_dai *dai)
+{
+ struct ep93xx_i2s_info *info = dai->private_data;
+
+ if (!dai->active)
+ return;
+
+ ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK);
+ ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE);
+}
+
+static int ep93xx_i2s_resume(struct snd_soc_dai *dai)
+{
+ struct ep93xx_i2s_info *info = dai->private_data;
+
+ if (!dai->active)
+ return;
+
+ ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK);
+ ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE);
+}
+#else
+#define ep93xx_i2s_suspend NULL
+#define ep93xx_i2s_resume NULL
+#endif
+
+static struct snd_soc_dai_ops ep93xx_i2s_dai_ops = {
+ .startup = ep93xx_i2s_startup,
+ .shutdown = ep93xx_i2s_shutdown,
+ .hw_params = ep93xx_i2s_hw_params,
+ .set_sysclk = ep93xx_i2s_set_sysclk,
+ .set_fmt = ep93xx_i2s_set_dai_fmt,
+};
+
+#define EP93XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_dai ep93xx_i2s_dai = {
+ .name = "ep93xx-i2s",
+ .id = 0,
+ .symmetric_rates= 1,
+ .suspend = ep93xx_i2s_suspend,
+ .resume = ep93xx_i2s_resume,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = EP93XX_I2S_FORMATS,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = EP93XX_I2S_FORMATS,
+ },
+ .ops = &ep93xx_i2s_dai_ops,
+};
+EXPORT_SYMBOL_GPL(ep93xx_i2s_dai);
+
+static int ep93xx_i2s_probe(struct platform_device *pdev)
+{
+ struct ep93xx_i2s_info *info;
+ struct resource *res;
+ int err;
+
+ info = kzalloc(sizeof(struct ep93xx_i2s_info), GFP_KERNEL);
+ if (!info) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ ep93xx_i2s_dai.dev = &pdev->dev;
+ ep93xx_i2s_dai.private_data = info;
+ info->dma_params = ep93xx_i2s_dma_params;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ err = -ENODEV;
+ goto fail;
+ }
+
+ info->mem = request_mem_region(res->start, resource_size(res),
+ pdev->name);
+ if (!info->mem) {
+ err = -EBUSY;
+ goto fail;
+ }
+
+ info->regs = ioremap(info->mem->start, resource_size(info->mem));
+ if (!info->regs) {
+ err = -ENXIO;
+ goto fail_release_mem;
+ }
+
+ info->mclk = clk_get(&pdev->dev, "mclk");
+ if (IS_ERR(info->mclk)) {
+ err = PTR_ERR(info->mclk);
+ goto fail_unmap_mem;
+ }
+
+ info->sclk = clk_get(&pdev->dev, "sclk");
+ if (IS_ERR(info->sclk)) {
+ err = PTR_ERR(info->sclk);
+ goto fail_put_mclk;
+ }
+
+ info->lrclk = clk_get(&pdev->dev, "lrclk");
+ if (IS_ERR(info->lrclk)) {
+ err = PTR_ERR(info->lrclk);
+ goto fail_put_sclk;
+ }
+
+ err = snd_soc_register_dai(&ep93xx_i2s_dai);
+ if (err)
+ goto fail_put_lrclk;
+
+ return 0;
+
+fail_put_lrclk:
+ clk_put(info->lrclk);
+fail_put_sclk:
+ clk_put(info->sclk);
+fail_put_mclk:
+ clk_put(info->mclk);
+fail_unmap_mem:
+ iounmap(info->regs);
+fail_release_mem:
+ release_mem_region(info->mem->start, resource_size(info->mem));
+ kfree(info);
+fail:
+ return err;
+}
+
+static int __devexit ep93xx_i2s_remove(struct platform_device *pdev)
+{
+ struct ep93xx_i2s_info *info = ep93xx_i2s_dai.private_data;
+
+ snd_soc_unregister_dai(&ep93xx_i2s_dai);
+ clk_put(info->lrclk);
+ clk_put(info->sclk);
+ clk_put(info->mclk);
+ iounmap(info->regs);
+ release_mem_region(info->mem->start, resource_size(info->mem));
+ kfree(info);
+ return 0;
+}
+
+static struct platform_driver ep93xx_i2s_driver = {
+ .probe = ep93xx_i2s_probe,
+ .remove = __devexit_p(ep93xx_i2s_remove),
+ .driver = {
+ .name = "ep93xx-i2s",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ep93xx_i2s_init(void)
+{
+ return platform_driver_register(&ep93xx_i2s_driver);
+}
+
+static void __exit ep93xx_i2s_exit(void)
+{
+ platform_driver_unregister(&ep93xx_i2s_driver);
+}
+
+module_init(ep93xx_i2s_init);
+module_exit(ep93xx_i2s_exit);
+
+MODULE_ALIAS("platform:ep93xx-i2s");
+MODULE_AUTHOR("Ryan Mallon <ryan at bluewatersys.com>");
+MODULE_DESCRIPTION("EP93XX I2S driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/ep93xx/ep93xx-i2s.h b/sound/soc/ep93xx/ep93xx-i2s.h
new file mode 100644
index 0000000..3bd4ebf
--- /dev/null
+++ b/sound/soc/ep93xx/ep93xx-i2s.h
@@ -0,0 +1,18 @@
+/*
+ * linux/sound/soc/ep93xx-i2s.h
+ * EP93xx I2S driver
+ *
+ * Copyright (C) 2010 Ryan Mallon <ryan at bluewatersys.com>
+ *
+ * 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.
+ *
+ */
+
+#ifndef _EP93XX_SND_SOC_I2S_H
+#define _EP93XX_SND_SOC_I2S_H
+
+extern struct snd_soc_dai ep93xx_i2s_dai;
+
+#endif /* _EP93XX_SND_SOC_I2S_H */
diff --git a/sound/soc/ep93xx/ep93xx-pcm.c b/sound/soc/ep93xx/ep93xx-pcm.c
new file mode 100644
index 0000000..4ba9384
--- /dev/null
+++ b/sound/soc/ep93xx/ep93xx-pcm.c
@@ -0,0 +1,319 @@
+/*
+ * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh at wantstofly.org>
+ * Copyright (C) 2006 Applied Data Systems
+ *
+ * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
+ * Copyright (c) 2008 Ryan Mallon <ryan at bluewatersys.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <mach/dma.h>
+#include <mach/hardware.h>
+#include <mach/ep93xx-regs.h>
+
+#include "ep93xx-pcm.h"
+
+static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
+ .info = (SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER),
+
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .rate_min = SNDRV_PCM_RATE_8000,
+ .rate_max = SNDRV_PCM_RATE_48000,
+
+ .formats = (SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE |
+ SNDRV_PCM_FMTBIT_S32_LE),
+
+ .buffer_bytes_max = 131072,
+ .period_bytes_min = 32,
+ .period_bytes_max = 32768,
+ .periods_min = 1,
+ .periods_max = 32,
+ .fifo_size = 32,
+};
+
+struct ep93xx_runtime_data
+{
+ struct ep93xx_dma_m2p_client cl;
+ struct ep93xx_pcm_dma_params *params;
+ int pointer_bytes;
+ struct tasklet_struct period_tasklet;
+ int periods;
+ struct ep93xx_dma_buffer buf[32];
+};
+
+static void ep93xx_pcm_period_elapsed(unsigned long data)
+{
+ struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
+ snd_pcm_period_elapsed(substream);
+}
+
+static void ep93xx_pcm_buffer_started(void *cookie,
+ struct ep93xx_dma_buffer *buf)
+{
+}
+
+static void ep93xx_pcm_buffer_finished(void *cookie,
+ struct ep93xx_dma_buffer *buf,
+ int bytes, int error)
+{
+ struct snd_pcm_substream *substream = cookie;
+ struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+
+ if (buf == rtd->buf + rtd->periods - 1)
+ rtd->pointer_bytes = 0;
+ else
+ rtd->pointer_bytes += buf->size;
+
+ if (!error) {
+ ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf);
+ tasklet_schedule(&rtd->period_tasklet);
+ } else {
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ }
+}
+
+static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = soc_rtd->dai->cpu_dai;
+ struct ep93xx_pcm_dma_params *dma_params;
+ struct ep93xx_runtime_data *rtd;
+ int ret;
+
+ dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
+ snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
+
+ rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
+ if (!rtd)
+ return -ENOMEM;
+
+ memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet));
+ rtd->period_tasklet.func = ep93xx_pcm_period_elapsed;
+ rtd->period_tasklet.data = (unsigned long)substream;
+
+ rtd->cl.name = dma_params->name;
+ rtd->cl.flags = dma_params->dma_port | EP93XX_DMA_M2P_IGNORE_ERROR |
+ ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX);
+ rtd->cl.cookie = substream;
+ rtd->cl.buffer_started = ep93xx_pcm_buffer_started;
+ rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished;
+ ret = ep93xx_dma_m2p_client_register(&rtd->cl);
+ if (ret < 0) {
+ kfree(rtd);
+ return ret;
+ }
+
+ substream->runtime->private_data = rtd;
+ return 0;
+}
+
+static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+
+ ep93xx_dma_m2p_client_unregister(&rtd->cl);
+ kfree(rtd);
+ return 0;
+}
+
+static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct ep93xx_runtime_data *rtd = runtime->private_data;
+ size_t totsize = params_buffer_bytes(params);
+ size_t period = params_period_bytes(params);
+ int i;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ runtime->dma_bytes = totsize;
+
+ rtd->periods = (totsize + period - 1) / period;
+ for (i = 0; i < rtd->periods; i++) {
+ rtd->buf[i].bus_addr = runtime->dma_addr + (i * period);
+ rtd->buf[i].size = period;
+ if ((i + 1) * period > totsize)
+ rtd->buf[i].size = totsize - (i * period);
+ }
+
+ return 0;
+}
+
+static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_set_runtime_buffer(substream, NULL);
+ return 0;
+}
+
+static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+ int ret;
+ int i;
+
+ ret = 0;
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ rtd->pointer_bytes = 0;
+ for (i = 0; i < rtd->periods; i++)
+ ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ ep93xx_dma_m2p_flush(&rtd->cl);
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+
+ /* FIXME: implement this with sub-period granularity */
+ return bytes_to_frames(runtime, rtd->pointer_bytes);
+}
+
+static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+ runtime->dma_area,
+ runtime->dma_addr,
+ runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops ep93xx_pcm_ops = {
+ .open = ep93xx_pcm_open,
+ .close = ep93xx_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = ep93xx_pcm_hw_params,
+ .hw_free = ep93xx_pcm_hw_free,
+ .trigger = ep93xx_pcm_trigger,
+ .pointer = ep93xx_pcm_pointer,
+ .mmap = ep93xx_pcm_mmap,
+};
+
+static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+ struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ size_t size = ep93xx_pcm_hardware.buffer_bytes_max;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+ buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+ &buf->addr, GFP_KERNEL);
+ buf->bytes = size;
+
+ return (buf->area == NULL) ? -ENOMEM : 0;
+}
+
+static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+ int stream;
+
+ for (stream = 0; stream < 2; stream++) {
+ substream = pcm->streams[stream].substream;
+ if (!substream)
+ continue;
+
+ buf = &substream->dma_buffer;
+ if (!buf->area)
+ continue;
+
+ dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area,
+ buf->addr);
+ buf->area = NULL;
+ }
+}
+
+static u64 ep93xx_pcm_dmamask = 0xffffffff;
+
+static int ep93xx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+ struct snd_pcm *pcm)
+{
+ int ret = 0;
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &ep93xx_pcm_dmamask;
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = 0xffffffff;
+
+ if (dai->playback.channels_min) {
+ ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ return ret;
+ }
+
+ if (dai->capture.channels_min) {
+ ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+struct snd_soc_platform ep93xx_soc_platform = {
+ .name = "ep93xx-audio",
+ .pcm_ops = &ep93xx_pcm_ops,
+ .pcm_new = &ep93xx_pcm_new,
+ .pcm_free = &ep93xx_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(ep93xx_soc_platform);
+
+static int __init ep93xx_soc_platform_init(void)
+{
+ return snd_soc_register_platform(&ep93xx_soc_platform);
+}
+
+static void __exit ep93xx_soc_platform_exit(void)
+{
+ snd_soc_unregister_platform(&ep93xx_soc_platform);
+}
+
+module_init(ep93xx_soc_platform_init);
+module_exit(ep93xx_soc_platform_exit);
+
+MODULE_AUTHOR("Ryan Mallon <ryan at bluewatersys.com>");
+MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/ep93xx/ep93xx-pcm.h b/sound/soc/ep93xx/ep93xx-pcm.h
new file mode 100644
index 0000000..4ffdd3f
--- /dev/null
+++ b/sound/soc/ep93xx/ep93xx-pcm.h
@@ -0,0 +1,22 @@
+/*
+ * sound/soc/ep93xx/ep93xx-pcm.h - EP93xx ALSA PCM interface
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh at wantstofly.org>
+ * Copyright (C) 2006 Applied Data Systems
+ *
+ * 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.
+ */
+
+#ifndef _EP93XX_SND_SOC_PCM_H
+#define _EP93XX_SND_SOC_PCM_H
+
+struct ep93xx_pcm_dma_params {
+ char *name;
+ int dma_port;
+};
+
+extern struct snd_soc_platform ep93xx_soc_platform;
+
+#endif /* _EP93XX_SND_SOC_PCM_H */
--
1.6.0.4
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