snow/exynos5250: move board-specific power stuff to mainboard dir

This moves highly board-specific code out from the Exynos5250
power_init() into Snow's romstage.c. There's no reason the CPU-
specific code should care about which PMIC we are using and
which bus it is on.

Change-Id: I52313177395519cddcab11225fc23d5e50c4c4e3
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/3034
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

2 files changed, 50 insertions, 64 deletions

diff --git a/src/cpu/samsung/exynos5250/power.c b/src/cpu/samsung/exynos5250/power.c
index 953bf5c518..ffba8c5f37 100644
--- a/src/cpu/samsung/exynos5250/power.c
+++ b/src/cpu/samsung/exynos5250/power.c
@@ -30,10 +30,6 @@
 #include <cpu/samsung/exynos5250/cpu.h>
 #include <cpu/samsung/exynos5250/power.h>
 #include <cpu/samsung/exynos5250/sysreg.h>
-#include <drivers/maxim/max77686/max77686.h>
-
-#include "device/i2c.h"
-#include "cpu/samsung/exynos5-common/i2c.h"
 
 static void ps_hold_setup(void)
 {
@@ -130,64 +126,10 @@ void power_exit_wakeup(void)
 	((resume_func)power->inform0)();
 }
 
-/**
- * Initialize the pmic voltages to power up the system
- * This also calls i2c_init so that we can program the pmic
- *
- * REG_ENABLE = 0, needed to set the buck/ldo enable bit ON
- *
- * @return	Return 0 if ok, else -1
- */
 int power_init(void)
 {
-	int error = 0;
-
-	/*
-	 * FIXME(dhendrix): We will re-factor the caller of power_init()
-	 * to start from a board-specific romstage file and do the i2c
-	 * early setup. There is no reason CPU power init code should
-	 * mess with board-specific i2c parameters.
-	 */
-	/* Set the i2c register address base so i2c works before FDT */
-	i2c_set_early_reg(0x12c60000);
-
 	ps_hold_setup();
-	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
-
-	/*
-	 * We're using CR1616 coin cell battery that is non-rechargeable
-	 * battery. But, BBCHOSTEN bit of the BBAT Charger Register in
-	 * MAX77686 is enabled by default for charging coin cell.
-	 *
-	 * Also, we cannot meet the coin cell reverse current spec. in UL
-	 * standard if BBCHOSTEN bit is enabled.
-	 *
-	 * Disable Coin BATT Charging
-	 */
-	error = max77686_disable_backup_batt();
-
-	error |= max77686_volsetting(PMIC_BUCK2, CONFIG_VDD_ARM_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_BUCK3, CONFIG_VDD_INT_UV,
-						REG_ENABLE, MAX77686_UV);
-	error |= max77686_volsetting(PMIC_BUCK1, CONFIG_VDD_MIF_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_BUCK4, CONFIG_VDD_G3D_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_LDO2, CONFIG_VDD_LDO2_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_LDO3, CONFIG_VDD_LDO3_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_LDO5, CONFIG_VDD_LDO5_MV,
-						REG_ENABLE, MAX77686_MV);
-	error |= max77686_volsetting(PMIC_LDO10, CONFIG_VDD_LDO10_MV,
-						REG_ENABLE, MAX77686_MV);
-	if (error != 0) {
-		power_shutdown();
-		printk(BIOS_ERR, "power init failed\n");
-	}
-
-	return error;
+	return 0;
 }
 
 void power_enable_xclkout(void)
diff --git a/src/mainboard/google/snow/romstage.c b/src/mainboard/google/snow/romstage.c
index 39069b2d95..ca7ba9c23b 100644
--- a/src/mainboard/google/snow/romstage.c
+++ b/src/mainboard/google/snow/romstage.c
@@ -35,6 +35,9 @@
 #include <console/console.h>
 #include <arch/stages.h>
 
+#include <drivers/maxim/max77686/max77686.h>
+#include <device/i2c.h>
+
 #include "mainboard.h"
 
 #define MMC0_GPIO_PIN	(58)
@@ -52,6 +55,45 @@ static int board_wakeup_permitted(void)
 }
 #endif
 
+static int setup_pmic(void)
+{
+	int error = 0;
+
+	/*
+	 * We're using CR1616 coin cell battery that is non-rechargeable
+	 * battery. But, BBCHOSTEN bit of the BBAT Charger Register in
+	 * MAX77686 is enabled by default for charging coin cell.
+	 *
+	 * Also, we cannot meet the coin cell reverse current spec. in UL
+	 * standard if BBCHOSTEN bit is enabled.
+	 *
+	 * Disable Coin BATT Charging
+	 */
+	error = max77686_disable_backup_batt();
+
+	error |= max77686_volsetting(PMIC_BUCK2, CONFIG_VDD_ARM_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_BUCK3, CONFIG_VDD_INT_UV,
+						REG_ENABLE, MAX77686_UV);
+	error |= max77686_volsetting(PMIC_BUCK1, CONFIG_VDD_MIF_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_BUCK4, CONFIG_VDD_G3D_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_LDO2, CONFIG_VDD_LDO2_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_LDO3, CONFIG_VDD_LDO3_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_LDO5, CONFIG_VDD_LDO5_MV,
+						REG_ENABLE, MAX77686_MV);
+	error |= max77686_volsetting(PMIC_LDO10, CONFIG_VDD_LDO10_MV,
+						REG_ENABLE, MAX77686_MV);
+
+	if (error)
+		printk(BIOS_CRIT, "%s: Error during PMIC setup\n", __func__);
+
+	return error;
+}
+
 static void initialize_s5p_mshc(void)
 {
 	/* MMC0: Fixed, 8 bit mode, connected with GPIO. */
@@ -90,11 +132,13 @@ void main(void)
 	system_clock_init(mem, arm_ratios);
 
 	console_init();
-	/*
-	 * FIXME: Do necessary I2C init so low-level PMIC code doesn't need to.
-	 * Also, we should only call power_init() on cold boot.
-	 */
-	power_init();
+
+	i2c_set_early_reg(0x12c60000);
+	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+	if (power_init())
+		power_shutdown();
+	if (setup_pmic())
+		power_shutdown();
 
 	if (!mem) {
 		printk(BIOS_CRIT, "Unable to auto-detect memory timings\n");