Sound: Add FDT support to driver

This patch adds FDT support to the sound driver.

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

drivers/sound/sound.c

@@ -24,111 +24,159 @@
 #include <malloc.h>
 #include <common.h>
 #include <asm/io.h>
+#include <libfdt.h>
+#include <fdtdec.h>
 #include <i2c.h>
 #include <i2s.h>
 #include <sound.h>
-#include "wm8994.h"
 #include <asm/arch/sound.h>
+#include "wm8994.h"
 
 /* defines */
 #define SOUND_400_HZ 400
 #define SOUND_BITS_IN_BYTE 8
 
 static struct i2stx_info g_i2stx_pri;
-static struct sound_codec_info g_codec_info;
 
 /*
- * get_sound_fdt_values gets fdt values for i2s parameters
+ * get_sound_i2s_values gets values for i2s parameters
  *
  * @param i2stx_info	i2s transmitter transfer param structure
- * @param blob		FDT blob
- */
-static void get_sound_i2s_values(struct i2stx_info *i2s)
-{
-	i2s->base_address = samsung_get_base_i2s();
-	i2s->audio_pll_clk = I2S_PLL_CLK;
-	i2s->samplingrate = I2S_SAMPLING_RATE;
-	i2s->bitspersample = I2S_BITS_PER_SAMPLE;
-	i2s->channels = I2S_CHANNELS;
-	i2s->rfs = I2S_RFS;
-	i2s->bfs = I2S_BFS;
-}
-
-/*
- * Gets fdt values for wm8994 config parameters
- *
- * @param pcodec_info	codec information structure
- * @param blob		FDT blob
- * @return		int value, 0 for success
+ * @param blob		FDT blob if enabled else NULL
  */
-static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
+static int get_sound_i2s_values(struct i2stx_info *i2s, const void *blob)
 {
+#ifdef CONFIG_OF_CONTROL
+	int node;
 	int error = 0;
+	int base;
 
-	switch (AUDIO_COMPAT) {
-	case AUDIO_COMPAT_SPI:
-		debug("%s: Support not added for SPI interface\n", __func__);
+	node = fdtdec_next_compatible(blob, 0,
+					COMPAT_SAMSUNG_EXYNOS5_SOUND);
+	if (node <= 0) {
+		debug("EXYNOS_SOUND: No node for sound in device tree\n");
 		return -1;
-		break;
-	case AUDIO_COMPAT_I2C:
-		pcodec_info->i2c_bus = AUDIO_I2C_BUS;
-		pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
-		debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
-		break;
-	default:
-		debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
+	}
+
+	/*
+	 * Get the pre-defined sound specific values from FDT.
+	 * All of these are expected to be correct otherwise
+	 * wrong register values in i2s setup parameters
+	 * may result in no sound play.
+	 */
+	base = fdtdec_get_addr(blob, node, "reg");
+	if (base == FDT_ADDR_T_NONE) {
+		debug("%s: Missing  i2s base\n", __func__);
 		return -1;
 	}
+	i2s->base_address = base;
 
+	i2s->audio_pll_clk = fdtdec_get_int(blob,
+				node, "samsung,i2s-epll-clock-frequency", -1);
+	error |= i2s->audio_pll_clk;
+	debug("audio_pll_clk = %d\n", i2s->audio_pll_clk);
+	i2s->samplingrate = fdtdec_get_int(blob,
+				node, "samsung,i2s-sampling-rate", -1);
+	error |= i2s->samplingrate;
+	debug("samplingrate = %d\n", i2s->samplingrate);
+	i2s->bitspersample = fdtdec_get_int(blob,
+				node, "samsung,i2s-bits-per-sample", -1);
+	error |= i2s->bitspersample;
+	debug("bitspersample = %d\n", i2s->bitspersample);
+	i2s->channels = fdtdec_get_int(blob,
+			node, "samsung,i2s-channels", -1);
+	error |= i2s->channels;
+	debug("channels = %d\n", i2s->channels);
+	i2s->rfs = fdtdec_get_int(blob,
+				node, "samsung,i2s-lr-clk-framesize", -1);
+	error |= i2s->rfs;
+	debug("rfs = %d\n", i2s->rfs);
+	i2s->bfs = fdtdec_get_int(blob,
+				node, "samsung,i2s-bit-clk-framesize", -1);
+	error |= i2s->bfs;
+	debug("bfs = %d\n", i2s->bfs);
 	if (error == -1) {
-		debug("fail to get wm8994 codec node properties\n");
+		debug("fail to get sound i2s node properties\n");
 		return -1;
 	}
-
+#else
+	i2s->base_address = samsung_get_base_i2s();
+	i2s->audio_pll_clk = I2S_PLL_CLK;
+	i2s->samplingrate = I2S_SAMPLING_RATE;
+	i2s->bitspersample = I2S_BITS_PER_SAMPLE;
+	i2s->channels = I2S_CHANNELS;
+	i2s->rfs = I2S_RFS;
+	i2s->bfs = I2S_BFS;
+#endif
 	return 0;
 }
 
 /*
- * Gets fdt values for codec config parameters
+ * Init codec
  *
- * @param pcodec_info	codec information structure
- * @param blob		FDT blob
- * @return		int value, 0 for success
+ * @param blob          FDT blob
+ * @param pi2s_tx	i2s parameters required by codec
+ * @return              int value, 0 for success
  */
-static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
+static int codec_init(const void *blob, struct i2stx_info *pi2s_tx)
 {
-	int error = 0;
+	int ret;
 	const char *codectype;
+#ifdef CONFIG_OF_CONTROL
+	int node;
 
-	codectype =  AUDIO_CODEC;
+	/* Get the node from FDT for sound */
+	node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND);
+	if (node <= 0) {
+		debug("EXYNOS_SOUND: No node for sound in device tree\n");
+		debug("node = %d\n", node);
+		return -1;
+	}
 
+	/*
+	 * Get the pre-defined sound codec specific values from FDT.
+	 * All of these are expected to be correct otherwise sound
+	 * can not be played
+	 */
+	codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL);
+	debug("device = %s\n", codectype);
+#else
+	codectype =  AUDIO_CODEC;
+#endif
 	if (!strcmp(codectype, "wm8994")) {
-		pcodec_info->codec_type = CODEC_WM_8994;
-		error = get_sound_wm8994_values(pcodec_info);
+		/* Check the codec type and initialise the same */
+		ret = wm8994_init(blob, WM8994_AIF2,
+			pi2s_tx->samplingrate,
+			(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
+			pi2s_tx->bitspersample, pi2s_tx->channels);
 	} else {
-		error = -1;
+		debug("%s: Unknown code type %s\n", __func__,
+		      codectype);
+		return -1;
 	}
-
-	if (error == -1) {
-		debug("fail to get sound codec node properties\n");
+	if (ret) {
+		debug("%s: Codec init failed\n", __func__);
 		return -1;
 	}
 
 	return 0;
 }
 
-int sound_init(void)
+int sound_init(const void *blob)
 {
 	int ret;
 	struct i2stx_info *pi2s_tx = &g_i2stx_pri;
-	struct sound_codec_info *pcodec_info = &g_codec_info;
 
 	/* Get the I2S Values */
-	get_sound_i2s_values(pi2s_tx);
+	if (get_sound_i2s_values(pi2s_tx, blob) < 0) {
+		debug(" FDT I2S values failed\n");
+		return -1;
+	}
 
-	/* Get the codec Values */
-	if (get_sound_codec_values(pcodec_info) < 0)
+	if (codec_init(blob, pi2s_tx) < 0) {
+		debug(" Codec init failed\n");
 		return -1;
+	}
 
 	ret = i2s_tx_init(pi2s_tx);
 	if (ret) {
@@ -137,21 +185,6 @@ int sound_init(void)
 		return ret;
 	}
 
-	/* Check the codec type and initialise the same */
-	if (pcodec_info->codec_type == CODEC_WM_8994) {
-		ret = wm8994_init(pcodec_info, WM8994_AIF2,
-			pi2s_tx->samplingrate,
-			(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
-			pi2s_tx->bitspersample, pi2s_tx->channels);
-	} else {
-		debug("%s: Unknown code type %d\n", __func__,
-		      pcodec_info->codec_type);
-		return -1;
-	}
-	if (ret) {
-		debug("%s: Codec init failed\n", __func__);
-		return -1;
-	}
 
 	return ret;
 }

include/sound.h

@@ -46,10 +46,10 @@ struct sound_codec_info {
 
 /*
  * Initialises audio sub system
- *
+ * @param blob	Pointer of device tree node or NULL if none.
  * @return	int value 0 for success, -1 for error
  */
-int sound_init(void);
+int sound_init(const void *blob);
 
 /*
  * plays the pcm data buffer in pcm_data.h through i2s1 to make the