[PATCH V3] ASoC: SAMSUNG: Add DT support for i2s
Padmavathi Venna
padma.v at samsung.com
Mon Nov 5 23:41:36 EST 2012
Add support for device based discovery.
Signed-off-by: Padmavathi Venna <padma.v at samsung.com>
---
Changes since V2:
- Rebased on 3.7-rc3
- Custom DT bindings are prefixed with samsung
- As generic device tree DMA helpers not yet mainlined
I am still using custom dma bindings. So added a
priliminary statement regarding the same. I will rework
on my patch once generic DMA helpers are mainlined.
Chnages since V1:
- Rebased on 3.6-rc6
.../devicetree/bindings/sound/samsung-i2s.txt | 69 ++++++
sound/soc/samsung/dma.c | 1 +
sound/soc/samsung/dma.h | 1 +
sound/soc/samsung/i2s.c | 234 ++++++++++++++++----
4 files changed, 256 insertions(+), 49 deletions(-)
create mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.txt
diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.txt b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
new file mode 100644
index 0000000..dca61a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
@@ -0,0 +1,69 @@
+* Samsung I2S controller
+
+Required SoC Specific Properties:
+
+- compatible : "samsung,samsung-i2s"
+- reg: physical base address of the controller and length of memory mapped
+ region.
+
+[PRELIMINARY: the dma channel allocation will change once there are
+official DMA bindings]
+
+- tx-dma-channel-secondary: The dma channel specifier for secondary tx
+ operations. The format of the dma specifier depends on the dma
+ controller.
+- tx-dma-channel: The dma channel specifier for tx operations. The format of
+ the dma specifier depends on the dma controller.
+- rx-dma-channel: The dma channel specifier for rx operations. The format of
+ the dma specifier depends on the dma controller.
+
+Optional SoC Specific Properties:
+
+- samsung,supports-6ch: If the I2S Primary sound source has 5.1 Channel
+ support, this flag is enabled.
+- samsung,supports-rstclr: This flag should be set if I2S software reset bit
+ control is required. When this flag is set I2S software reset bit will be
+ enabled or disabled based on need.
+- samsung,supports-secdai:If I2S block has a secondary FIFO and internal DMA,
+ then this flag is enabled.
+- samsung,idma-addr: Internal DMA register base address of the audio
+ sub system(used in secondary sound source).
+
+Required Board Specific Properties:
+
+- gpios: The gpio specifier for data out,data in, LRCLK, CDCLK and SCLK
+ interface lines. The format of the gpio specifier depends on the gpio
+ controller.
+
+Aliases:
+
+- All the I2S controller nodes should be represented in the aliases node using
+ the following format 'i2s{n}' where n is a unique number for the alias.
+
+Example:
+
+- SoC Specific Portion:
+
+i2s at 03830000 {
+ compatible = "samsung,samsung-i2s";
+ reg = <0x03830000 0x100>;
+ tx-dma-channel-secondary = <&pdma0 8>;
+ tx-dma-channel = <&pdma0 10>;
+ rx-dma-channel = <&pdma0 9>;
+ samsung,supports-6ch;
+ samsung,supports-rstclr;
+ samsung,supports-secdai;
+ samsung,idma-addr = <0x03000000>;
+};
+
+- Board Specific Portion:
+
+i2s_0: i2s at 03830000 {
+ gpios = <&gpz 0 2 0 0>,
+ <&gpz 1 2 0 0>,
+ <&gpz 2 2 0 0>,
+ <&gpz 3 2 0 0>,
+ <&gpz 4 2 0 0>,
+ <&gpz 5 2 0 0>,
+ <&gpz 6 2 0 0>;
+};
diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c
index b70964e..359708c 100644
--- a/sound/soc/samsung/dma.c
+++ b/sound/soc/samsung/dma.c
@@ -168,6 +168,7 @@ static int dma_hw_params(struct snd_pcm_substream *substream,
req.cap = (samsung_dma_has_circular() ?
DMA_CYCLIC : DMA_SLAVE);
req.client = prtd->params->client;
+ req.dt_dmach_prop = prtd->params->dma_prop;
config.direction =
(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index 7d1ead7..2e60415 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -19,6 +19,7 @@ struct s3c_dma_params {
int dma_size; /* Size of the DMA transfer */
unsigned ch;
struct samsung_dma_ops *ops;
+ struct property *dma_prop;
};
#endif
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 40b00a1..f9d55e5 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -15,11 +15,15 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
+#include <mach/dma.h>
+
#include <linux/platform_data/asoc-s3c.h>
#include "dma.h"
@@ -49,8 +53,6 @@ struct i2s_dai {
struct clk *clk;
/* Clock for generating I2S signals */
struct clk *op_clk;
- /* Array of clock names for op_clk */
- const char **src_clk;
/* Pointer to the Primary_Fifo if this is Sec_Fifo, NULL otherwise */
struct i2s_dai *pri_dai;
/* Pointer to the Secondary_Fifo if it has one, NULL otherwise */
@@ -68,6 +70,8 @@ struct i2s_dai {
u32 suspend_i2smod;
u32 suspend_i2scon;
u32 suspend_i2spsr;
+ unsigned long gpios[7]; /* i2s gpio line numbers */
+ int dev_id; /* i2s dev id */
};
/* Lock for cross i/f checks */
@@ -385,6 +389,7 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai,
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
u32 mod = readl(i2s->addr + I2SMOD);
+ char clk_name[16];
switch (clk_id) {
case SAMSUNG_I2S_CDCLK:
@@ -432,8 +437,9 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai,
}
}
+ sprintf(clk_name, "i2s_opclk%d", clk_id);
i2s->op_clk = clk_get(&i2s->pdev->dev,
- i2s->src_clk[clk_id]);
+ clk_name);
clk_enable(i2s->op_clk);
i2s->rclk_srcrate = clk_get_rate(i2s->op_clk);
@@ -980,8 +986,9 @@ struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
} else { /* Create a new platform_device for Secondary */
i2s->pdev = platform_device_register_resndata(NULL,
- pdev->name, pdev->id + SAMSUNG_I2S_SECOFF,
- NULL, 0, NULL, 0);
+ "samsung-i2s",
+ i2s->dev_id + SAMSUNG_I2S_SECOFF, NULL, 0,
+ NULL, 0);
if (IS_ERR(i2s->pdev))
return NULL;
}
@@ -992,49 +999,154 @@ struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
return i2s;
}
+#ifdef CONFIG_OF
+static int samsung_i2s_parse_dt_gpio(struct i2s_dai *i2s)
+{
+ struct device *dev = &i2s->pdev->dev;
+ int index, gpio, ret;
+
+ for (index = 0; index < 7; index++) {
+ gpio = of_get_gpio(dev->of_node, index);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(dev, "invalid gpio[%d]: %d\n", index, gpio);
+ goto free_gpio;
+ }
+
+ ret = gpio_request(gpio, dev_name(dev));
+ if (ret) {
+ dev_err(dev, "gpio [%d] request failed\n", gpio);
+ goto free_gpio;
+ }
+ i2s->gpios[index] = gpio;
+ }
+ return 0;
+
+free_gpio:
+ while (--index >= 0)
+ gpio_free(i2s->gpios[index]);
+ return -EINVAL;
+}
+
+static void samsung_i2s_dt_gpio_free(struct i2s_dai *i2s)
+{
+ unsigned int index;
+ for (index = 0; index < 7; index++)
+ gpio_free(i2s->gpios[index]);
+}
+#else
+static int samsung_i2s_parse_dt_gpio(struct i2s_dai *dai)
+{
+ return -EINVAL;
+}
+
+static void samsung_i2s_dt_gpio_free(struct i2s_dai *dai)
+{
+}
+
+#endif
+
static __devinit int samsung_i2s_probe(struct platform_device *pdev)
{
- u32 dma_pl_chan, dma_cp_chan, dma_pl_sec_chan;
+ u32 dma_pl_chan, dma_cp_chan;
+ u32 dma_pl_sec_chan = 0;
struct i2s_dai *pri_dai, *sec_dai = NULL;
- struct s3c_audio_pdata *i2s_pdata;
- struct samsung_i2s *i2s_cfg;
+ struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
+ struct samsung_i2s *i2s_cfg = NULL;
struct resource *res;
- u32 regs_base, quirks;
- int ret = 0;
+ u32 regs_base, quirks = 0, idma_addr = 0;
+ struct property *prop;
+ struct device_node *np = pdev->dev.of_node;
+ int ret = 0, id;
/* Call during Seconday interface registration */
- if (pdev->id >= SAMSUNG_I2S_SECOFF) {
+ if (np) {
+ id = of_alias_get_id(np, "i2s");
+ if (id < 0) {
+ dev_err(&pdev->dev, "failed to get alias id:%d\n", id);
+ return id;
+ }
+ } else {
+ id = pdev->id;
+ }
+
+ if (id >= SAMSUNG_I2S_SECOFF) {
sec_dai = dev_get_drvdata(&pdev->dev);
snd_soc_register_dai(&sec_dai->pdev->dev,
&sec_dai->i2s_dai_drv);
return 0;
}
- i2s_pdata = pdev->dev.platform_data;
- if (i2s_pdata == NULL) {
- dev_err(&pdev->dev, "Can't work without s3c_audio_pdata\n");
- return -EINVAL;
+ pri_dai = i2s_alloc_dai(pdev, false);
+ if (!pri_dai) {
+ dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
+ return -ENOMEM;
}
- res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (!res) {
- dev_err(&pdev->dev, "Unable to get I2S-TX dma resource\n");
- return -ENXIO;
- }
- dma_pl_chan = res->start;
+ if (!np) {
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "Unable to get I2S-TX dma resource\n");
+ return -ENXIO;
+ }
+ dma_pl_chan = res->start;
- res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (!res) {
- dev_err(&pdev->dev, "Unable to get I2S-RX dma resource\n");
- return -ENXIO;
- }
- dma_cp_chan = res->start;
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "Unable to get I2S-RX dma resource\n");
+ return -ENXIO;
+ }
+ dma_cp_chan = res->start;
- res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
- if (res)
- dma_pl_sec_chan = res->start;
- else
- dma_pl_sec_chan = 0;
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
+ if (res)
+ dma_pl_sec_chan = res->start;
+
+ if (&i2s_pdata->type)
+ i2s_cfg = &i2s_pdata->type.i2s;
+
+ if (i2s_cfg) {
+ quirks = i2s_cfg->quirks;
+ idma_addr = i2s_cfg->idma_addr;
+ }
+ } else {
+ prop = of_find_property(np, "tx-dma-channel", NULL);
+ if (!prop) {
+ dev_err(&pdev->dev, "tx dma channel property not"\
+ "specified\n");
+ return -ENXIO;
+ }
+ dma_pl_chan = DMACH_DT_PROP;
+ pri_dai->dma_playback.dma_prop = prop;
+
+ prop = of_find_property(np, "rx-dma-channel", NULL);
+ if (!prop) {
+ dev_err(&pdev->dev, "tx dma channel property not"\
+ "specified\n");
+ return -ENXIO;
+ }
+ dma_cp_chan = DMACH_DT_PROP;
+ pri_dai->dma_capture.dma_prop = prop;
+
+ if (of_find_property(np, "samsung,supports-6ch", NULL))
+ quirks |= QUIRK_PRI_6CHAN;
+
+ if (of_find_property(np, "samsung,supports-secdai", NULL))
+ quirks |= QUIRK_SEC_DAI;
+
+ if (of_find_property(np, "samsung,supports-rstclr", NULL))
+ quirks |= QUIRK_NEED_RSTCLR;
+
+ if (of_property_read_u32(np, "samsung,idma-addr",
+ &idma_addr)) {
+ if (quirks & QUIRK_SEC_DAI) {
+ dev_err(&pdev->dev, "idma address is not"\
+ "specified");
+ return -EINVAL;
+ }
+ }
+ }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@@ -1049,16 +1161,6 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
}
regs_base = res->start;
- i2s_cfg = &i2s_pdata->type.i2s;
- quirks = i2s_cfg->quirks;
-
- pri_dai = i2s_alloc_dai(pdev, false);
- if (!pri_dai) {
- dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
- ret = -ENOMEM;
- goto err;
- }
-
pri_dai->dma_playback.dma_addr = regs_base + I2STXD;
pri_dai->dma_capture.dma_addr = regs_base + I2SRXD;
pri_dai->dma_playback.client =
@@ -1067,11 +1169,11 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
(struct s3c2410_dma_client *)&pri_dai->dma_capture;
pri_dai->dma_playback.channel = dma_pl_chan;
pri_dai->dma_capture.channel = dma_cp_chan;
- pri_dai->src_clk = i2s_cfg->src_clk;
pri_dai->dma_playback.dma_size = 4;
pri_dai->dma_capture.dma_size = 4;
pri_dai->base = regs_base;
pri_dai->quirks = quirks;
+ pri_dai->dev_id = id;
if (quirks & QUIRK_PRI_6CHAN)
pri_dai->i2s_dai_drv.playback.channels_max = 6;
@@ -1086,21 +1188,42 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
sec_dai->dma_playback.client =
(struct s3c2410_dma_client *)&sec_dai->dma_playback;
+
+ if (np) {
+ prop = of_find_property(np, "tx-dma-channel-secondary",
+ NULL);
+ if (!prop) {
+ dev_err(&pdev->dev, "tx dma channel property"\
+ "not specified\n");
+ ret = -ENXIO;
+ goto err;
+ }
+ sec_dai->dma_playback.dma_prop = prop;
+ }
+
/* Use iDMA always if SysDMA not provided */
sec_dai->dma_playback.channel = dma_pl_sec_chan ? : -1;
- sec_dai->src_clk = i2s_cfg->src_clk;
sec_dai->dma_playback.dma_size = 4;
sec_dai->base = regs_base;
sec_dai->quirks = quirks;
- sec_dai->idma_playback.dma_addr = i2s_cfg->idma_addr;
+ sec_dai->dev_id = id;
+ sec_dai->idma_playback.dma_addr = idma_addr;
sec_dai->pri_dai = pri_dai;
pri_dai->sec_dai = sec_dai;
}
- if (i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
- dev_err(&pdev->dev, "Unable to configure gpio\n");
- ret = -EINVAL;
- goto err;
+ if (np) {
+ if (samsung_i2s_parse_dt_gpio(pri_dai)) {
+ dev_err(&pdev->dev, "Unable to configure gpio\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ } else {
+ if (i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
+ dev_err(&pdev->dev, "Unable to configure gpio\n");
+ ret = -EINVAL;
+ goto err;
+ }
}
snd_soc_register_dai(&pri_dai->pdev->dev, &pri_dai->i2s_dai_drv);
@@ -1118,10 +1241,14 @@ static __devexit int samsung_i2s_remove(struct platform_device *pdev)
{
struct i2s_dai *i2s, *other;
struct resource *res;
+ struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
i2s = dev_get_drvdata(&pdev->dev);
other = i2s->pri_dai ? : i2s->sec_dai;
+ if (!i2s_pdata->cfg_gpio && pdev->dev.of_node)
+ samsung_i2s_dt_gpio_free(i2s->pri_dai);
+
if (other) {
other->pri_dai = NULL;
other->sec_dai = NULL;
@@ -1140,12 +1267,21 @@ static __devexit int samsung_i2s_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_i2s_match[] = {
+ { .compatible = "samsung,samsung-i2s" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, exynos_i2s_match);
+#endif
+
static struct platform_driver samsung_i2s_driver = {
.probe = samsung_i2s_probe,
.remove = __devexit_p(samsung_i2s_remove),
.driver = {
.name = "samsung-i2s",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(exynos_i2s_match),
},
};
--
1.7.4.4
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