ARM: OMAP: Add audio power control interface for DSP Gateway

Signed-off-by: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
Signed-off-by: Juha Yrjl <juha.yrjola@nokia.com>

arch/arm/mach-omap1/board-nokia770.c

@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
+#include <linux/clk.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/ads7846.h>
@@ -27,6 +28,9 @@
 #include <asm/arch/board.h>
 #include <asm/arch/keypad.h>
 #include <asm/arch/common.h>
+#include <asm/arch/dsp_common.h>
+#include <asm/arch/aic23.h>
+#include <asm/arch/gpio.h>
 
 static void __init omap_nokia770_init_irq(void)
 {
@@ -136,6 +140,95 @@ static struct omap_board_config_kernel nokia770_config[] = {
 	{ OMAP_TAG_MMC,		&nokia770_mmc_config },
 };
 
+/*
+ * audio power control
+ */
+#define	HEADPHONE_GPIO		14
+#define	AMPLIFIER_CTRL_GPIO	58
+
+static struct clk *dspxor_ck;
+static DECLARE_MUTEX(audio_pwr_sem);
+/*
+ * audio_pwr_state
+ * +--+-------------------------+---------------------------------------+
+ * |-1|down			|power-up request -> 0			|
+ * +--+-------------------------+---------------------------------------+
+ * | 0|up			|power-down(1) request -> 1		|
+ * |  |				|power-down(2) request -> (ignore)	|
+ * +--+-------------------------+---------------------------------------+
+ * | 1|up,			|power-up request -> 0			|
+ * |  |received down(1) request	|power-down(2) request -> -1		|
+ * +--+-------------------------+---------------------------------------+
+ */
+static int audio_pwr_state = -1;
+
+/*
+ * audio_pwr_up / down should be called under audio_pwr_sem
+ */
+static void nokia770_audio_pwr_up(void)
+{
+	clk_enable(dspxor_ck);
+
+	/* Turn on codec */
+	tlv320aic23_power_up();
+
+	if (omap_get_gpio_datain(HEADPHONE_GPIO))
+		/* HP not connected, turn on amplifier */
+		omap_set_gpio_dataout(AMPLIFIER_CTRL_GPIO, 1);
+	else
+		/* HP connected, do not turn on amplifier */
+		printk("HP connected\n");
+}
+
+static void codec_delayed_power_down(void *arg)
+{
+	down(&audio_pwr_sem);
+	if (audio_pwr_state == -1)
+		tlv320aic23_power_down();
+	up(&audio_pwr_sem);
+}
+
+static DECLARE_WORK(codec_power_down_work, codec_delayed_power_down, NULL);
+
+static void nokia770_audio_pwr_down(void)
+{
+	clk_disable(dspxor_ck);
+
+	/* Turn off amplifier */
+	omap_set_gpio_dataout(AMPLIFIER_CTRL_GPIO, 0);
+
+	/* Turn off codec: schedule delayed work */
+	schedule_delayed_work(&codec_power_down_work, HZ / 20);	/* 50ms */
+}
+
+void nokia770_audio_pwr_up_request(int stage)
+{
+	down(&audio_pwr_sem);
+	if (audio_pwr_state == -1)
+		nokia770_audio_pwr_up();
+	/* force audio_pwr_state = 0, even if it was 1. */
+	audio_pwr_state = 0;
+	up(&audio_pwr_sem);
+}
+
+void nokia770_audio_pwr_down_request(int stage)
+{
+	down(&audio_pwr_sem);
+	switch (stage) {
+		case 1:
+			if (audio_pwr_state == 0)
+				audio_pwr_state = 1;
+			break;
+		case 2:
+			if (audio_pwr_state == 1) {
+				nokia770_audio_pwr_down();
+				audio_pwr_state = -1;
+			}
+			break;
+	}
+	up(&audio_pwr_sem);
+}
+
 static void __init omap_nokia770_init(void)
 {
 	nokia770_config[0].data = &nokia770_usb_config;
@@ -146,6 +239,9 @@ static void __init omap_nokia770_init(void)
 	omap_board_config = nokia770_config;
 	omap_board_config_size = ARRAY_SIZE(nokia770_config);
 	omap_serial_init();
+	omap_dsp_audio_pwr_up_request = nokia770_audio_pwr_up_request;
+	omap_dsp_audio_pwr_down_request = nokia770_audio_pwr_down_request;
+	dspxor_ck = clk_get(0, "dspxor_ck");
 }
 
 static void __init omap_nokia770_map_io(void)

arch/arm/plat-omap/dsp/dsp_common.c

@@ -496,6 +496,26 @@ void dsp_unregister_mem_cb(void)
 	up(&cpustat.sem);
 }
 
+/*
+ * Audio power control function prototypes and defaults
+ * (To be overridden with board specific functions)
+ */
+static void generic_audio_pwr_up_request(int stage)
+{
+	printk(KERN_ERR "audio power-up request function is not defined.\n");
+}
+
+void (*omap_dsp_audio_pwr_up_request)(int stage) = generic_audio_pwr_up_request;
+EXPORT_SYMBOL(omap_dsp_audio_pwr_up_request);
+
+static void generic_audio_pwr_down_request(int stage)
+{
+	printk(KERN_ERR "audio power-down request function is not defined.\n");
+}
+
+void (*omap_dsp_audio_pwr_down_request)(int stage) = generic_audio_pwr_down_request;
+EXPORT_SYMBOL(omap_dsp_audio_pwr_down_request);
+
 arch_initcall(omap_dsp_init);
 
 EXPORT_SYMBOL(omap_dsp_request_mpui);

arch/arm/plat-omap/dsp/dsp_core.c

@@ -37,6 +37,7 @@
 #include <asm/signal.h>
 #include <asm/delay.h>
 #include <asm/irq.h>
+#include <asm/arch/dsp_common.h>
 #include <asm/arch/dsp.h>
 #include "hardware_dsp.h"
 #include "dsp.h"
@@ -455,13 +456,39 @@ static void mbx1_kfunc_fbctl(unsigned short data)
 	}
 }
 
+static void mbx1_kfunc_audio_pwr(unsigned short data)
+{
+	struct mbcmd mb;
+
+	switch (data) {
+	case OMAP_DSP_MBCMD_AUDIO_PWR_UP:
+		omap_dsp_audio_pwr_up_request(0);
+		/* send back ack */
+		mbcmd_set(mb, MBCMD(KFUNC), OMAP_DSP_MBCMD_KFUNC_AUDIO_PWR,
+			  OMAP_DSP_MBCMD_AUDIO_PWR_UP);
+		dsp_mbcmd_send(&mb);
+		break;
+	case OMAP_DSP_MBCMD_AUDIO_PWR_DOWN1:
+		omap_dsp_audio_pwr_down_request(1);
+		break;
+	case OMAP_DSP_MBCMD_AUDIO_PWR_DOWN2:
+		omap_dsp_audio_pwr_down_request(2);
+		break;
+	default:
+		printk(KERN_ERR
+		       "mailbox: Unknown AUDIO_PWR from DSP: 0x%04x\n", data);
+	}
+}
+
 static void mbx1_kfunc(struct mbcmd *mb)
 {
 	switch (mb->cmd_l) {
 	case OMAP_DSP_MBCMD_KFUNC_FBCTL:
 		mbx1_kfunc_fbctl(mb->data);
 		break;
-
+	case OMAP_DSP_MBCMD_KFUNC_AUDIO_PWR:
+		mbx1_kfunc_audio_pwr(mb->data);
+		break;
 	default:
 		printk(KERN_ERR
 		       "mailbox: Unknown kfunc from DSP: 0x%02x\n", mb->cmd_l);

arch/arm/plat-omap/dsp/mblog.c

@@ -60,6 +60,7 @@ char *subcmd_name(struct mbcmd *mb)
 		break;
 	case MBCMD(KFUNC):
 		s = (cmd_l == KFUNCCMD(FBCTL))     ? "FBCTL":
+		    (cmd_l == KFUNCCMD(AUDIO_PWR)) ? "AUDIO_PWR":
 		    NULL;
 		break;
 	case MBCMD(DSPCFG):

include/asm-arm/arch-omap/aic23.h

@@ -110,4 +110,7 @@
 #define TLV320AIC23ID1                  (0x1a)	// cs low
 #define TLV320AIC23ID2                  (0x1b)	// cs high
 
+void tlv320aic23_power_up(void);
+void tlv320aic23_power_down(void);
+
 #endif /* __ASM_ARCH_AIC23_H */

include/asm-arm/arch-omap/dsp.h

@@ -181,11 +181,16 @@ struct omap_dsp_varinfo {
 #define OMAP_DSP_MBCMD_PM_ENABLE	0x01
 
 #define OMAP_DSP_MBCMD_KFUNC_FBCTL	0x00
+#define OMAP_DSP_MBCMD_KFUNC_AUDIO_PWR	0x01
 
 #define OMAP_DSP_MBCMD_FBCTL_UPD	0x0000
 #define OMAP_DSP_MBCMD_FBCTL_ENABLE	0x0002
 #define OMAP_DSP_MBCMD_FBCTL_DISABLE	0x0003
 
+#define OMAP_DSP_MBCMD_AUDIO_PWR_UP	0x0000
+#define OMAP_DSP_MBCMD_AUDIO_PWR_DOWN1	0x0001
+#define OMAP_DSP_MBCMD_AUDIO_PWR_DOWN2	0x0002
+
 #define OMAP_DSP_MBCMD_TDEL_SAFE	0x0000
 #define OMAP_DSP_MBCMD_TDEL_KILL	0x0001
 

include/asm-arm/arch-omap/dsp_common.h

@@ -27,9 +27,12 @@
 #ifndef ASM_ARCH_DSP_COMMON_H
 #define ASM_ARCH_DSP_COMMON_H
 
-void omap_dsp_request_mpui(void);
-void omap_dsp_release_mpui(void);
-int omap_dsp_request_mem(void);
-int omap_dsp_release_mem(void);
+extern void omap_dsp_request_mpui(void);
+extern void omap_dsp_release_mpui(void);
+extern int omap_dsp_request_mem(void);
+extern int omap_dsp_release_mem(void);
+
+extern void (*omap_dsp_audio_pwr_up_request)(int stage);
+extern void (*omap_dsp_audio_pwr_down_request)(int stage);
 
 #endif /* ASM_ARCH_DSP_COMMON_H */