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authorDavid Hendricks <dhendrix@chromium.org>2013-08-05 21:04:16 -0700
committerIsaac Christensen <isaac.christensen@se-eng.com>2014-07-29 21:49:50 +0200
commit77acf42819ed93f77706089b024a771323d34c7a (patch)
tree0596e0983eb56af96b8f5373876c898cc22f1463 /src/mainboard/google/pit
parent91175bb493bd01d9a64d2179c48e07f4cd815642 (diff)
pit: setup voltage rails before system clocks
This moves the call to setup_power() before system_clock_init(). This causes the PMIC to set up the voltage rails earlier so that the CPU clock can be set up at a faster rate (in the follow-up patch). After system clock init, we re-initialize the PMIC's I2C bus since the input clock rate will have changed. Old-Change-Id: Ieb828ac25daad7ee95bfa4823aaaf161028c9c92 Reviewed-on: https://gerrit.chromium.org/gerrit/64744 Reviewed-by: Gabe Black <gabeblack@chromium.org> Reviewed-by: Ronald G. Minnich <rminnich@chromium.org> Tested-by: David Hendricks <dhendrix@chromium.org> Commit-Queue: David Hendricks <dhendrix@chromium.org> (cherry picked from commit 6c133a84ef4a32c35577a266905e02af8c2d9278) pit: save setup_power() status and die later if needed Since system clock and console initialization now happen after power setup, we cannot print error messages in setup_power(). This patch re-factors the code a little bit to save the status of setup_power() so that if we get an error during setup_power() we will wait until we can actually print something before dying. Old-Change-Id: Id7ff477224b104b3c7e221c1d2df460ca9125f3b Reviewed-on: https://gerrit.chromium.org/gerrit/65009 Reviewed-by: Gabe Black <gabeblack@chromium.org> Commit-Queue: David Hendricks <dhendrix@chromium.org> Tested-by: David Hendricks <dhendrix@chromium.org> (cherry picked from commit 0c89f922b20bc1291ac7ba7b2c22bdce911be7a4) Squashed two closely related commits. Change-Id: I3efe29412738959e698c89d26e682536ceabdff8 Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6403 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
Diffstat (limited to 'src/mainboard/google/pit')
-rw-r--r--src/mainboard/google/pit/romstage.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/src/mainboard/google/pit/romstage.c b/src/mainboard/google/pit/romstage.c
index c971d0cc90..7733eca1c7 100644
--- a/src/mainboard/google/pit/romstage.c
+++ b/src/mainboard/google/pit/romstage.c
@@ -42,6 +42,8 @@
#define MMC0_GPIO_PIN (58)
+#define PMIC_I2C_BUS 4
+
struct pmic_write
{
int or_orig; // Whether to or in the original value.
@@ -75,7 +77,7 @@ struct pmic_write pmic_writes[] =
{ 0, MAX77802_REG_PMIC_BOOSTCTRL, MAX77802_BOOSTCTRL_OFF},
};
-static void setup_power(int is_resume)
+static int setup_power(int is_resume)
{
int error = 0;
int i;
@@ -83,14 +85,12 @@ static void setup_power(int is_resume)
power_init();
if (is_resume) {
- return;
+ return 0;
}
/* Initialize I2C bus to configure PMIC. */
exynos_pinmux_i2c4();
- i2c_init(4, 1000000, 0x00); /* 1MHz */
-
- printk(BIOS_DEBUG, "%s: Setting up PMIC...\n", __func__);
+ i2c_init(PMIC_I2C_BUS, 1000000, 0x00); /* 1MHz */
for (i = 0; i < ARRAY_SIZE(pmic_writes); i++) {
uint8_t data = 0;
@@ -106,8 +106,7 @@ static void setup_power(int is_resume)
&data, sizeof(data));
}
- if (error)
- die("Failed to intialize PMIC.\n");
+ return error;
}
static void setup_storage(void)
@@ -245,6 +244,9 @@ void main(void)
extern struct mem_timings mem_timings;
void *entry;
int is_resume = (get_wakeup_state() != IS_NOT_WAKEUP);
+ int power_init_failed;
+
+ power_init_failed = setup_power(is_resume);
/* Clock must be initialized before console_init, otherwise you may need
* to re-initialize serial console drivers again. */
@@ -253,7 +255,12 @@ void main(void)
exynos_pinmux_uart3();
console_init();
- setup_power(is_resume);
+ if (power_init_failed)
+ die("Failed to intialize power.\n");
+
+ /* re-initialize PMIC I2C channel after (re-)setting system clocks */
+ i2c_init(PMIC_I2C_BUS, 1000000, 0x00); /* 1MHz */
+
setup_memory(&mem_timings, is_resume);
primitive_mem_test();