New patch to review for coreboot: 1ccd9da google/rush_ryu: Add speaker amp config for AD4567 on P0/P1

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9532

-gerrit

commit 1ccd9da710e3e42d2af074f6cfb614649ab3685e
Author: Tom Warren 
Date:   Mon Nov 24 10:00:11 2014 -0700

google/rush_ryu: Add speaker amp config for AD4567 on P0/P1

A couple of regs need to be poked to allow audio output
    from this part on Ryu P0/P1. It will be replaced by two
    non-configurable amps on P3.

BUG=none
    BRANCH=none
    TEST=Build/flashed on Ryu P1, dumped AD4567 (I2C6 dev 0x34)
    regs and confirmed settings.

Change-Id: Ie602b056fb1488546ab233f8f81cfacb96624ebb
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 75dabe378b561e939381e2ef5113a2b28bfcedf8
    Original-Change-Id: I8999843646927dbd07a179ede973ba5f1eb97167
    Original-Signed-off-by: Tom Warren 
    Original-Reviewed-on: https://chromium-review.googlesource.com/231384
    Original-Reviewed-by: Aaron Durbin 
---
 src/mainboard/google/rush_ryu/mainboard.c | 34 +++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/mainboard/google/rush_ryu/mainboard.c b/src/mainboard/google/rush_ryu/mainboard.c
index 9673aa5..2955958 100644
--- a/src/mainboard/google/rush_ryu/mainboard.c
+++ b/src/mainboard/google/rush_ryu/mainboard.c
@@ -23,6 +23,7 @@
 #include <cbmem.h>
 #include <delay.h>
 #include <device/device.h>
+#include <device/i2c.h>
 #include <elog.h>
 #include <memrange.h>
 #include <soc/addressmap.h>
@@ -208,6 +209,37 @@ static void setup_audio(void)
    clock_enable_audio();
 }

+#define AD4567_DEV	0x34
+#define PWR_CTL		0
+#define DAC_CTL		2
+#define SPWDN		(1 << 0)
+#define DAC_MUTE	(1 << 6)
+#define DAC_FS		(0x7 << 0)
+#define SR_32K_48KHZ	0x2
+
+static void enable_ad4567_spkr_amp(void)
+{
+	uint8_t reg_byte;
+
+	if (board_id() >= BOARD_ID_PROTO_3)
+		return;
+	/*
+	 * I2C6, device 0x34 is an AD4567 speaker amp on P0/P1.
+	 * It needs to have a couple of regs tweaked to turn it on
+	 * so it can provide audio output to the mono speaker on P0/P1.
+	 */
+	i2c_readb(I2C6_BUS, AD4567_DEV, PWR_CTL, &reg_byte);
+	reg_byte &= ~SPWDN;		// power up amp
+	i2c_writeb(I2C6_BUS, AD4567_DEV, PWR_CTL, reg_byte);
+
+	/* The next 2 settings are defaults, but set them anyway */
+	i2c_readb(I2C6_BUS, AD4567_DEV, DAC_CTL, &reg_byte);
+	reg_byte &= ~DAC_MUTE;		// unmute DAC (default)
+	reg_byte &= ~DAC_FS;		// mask sample rate bits
+	reg_byte |= SR_32K_48KHZ;	// set 32K-48KHz sample rate (default)
+	i2c_writeb(I2C6_BUS, AD4567_DEV, DAC_CTL, reg_byte);
+}
+
 static void mainboard_init(device_t dev)
 {
    soc_configure_funits(funits, ARRAY_SIZE(funits));
@@ -217,6 +249,8 @@ static void mainboard_init(device_t dev)
    i2c_init(I2C6_BUS);

setup_audio();
+	/* Temp hack for P1 board: Enable speaker amp (powerup, etc.) */
+	enable_ad4567_spkr_amp();

elog_init();
    elog_add_boot_reason();