diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/veyron_pinky/romstage.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/mainboard/google/veyron_pinky/romstage.c b/src/mainboard/google/veyron_pinky/romstage.c index 31317a06a4..f972ee26c8 100644 --- a/src/mainboard/google/veyron_pinky/romstage.c +++ b/src/mainboard/google/veyron_pinky/romstage.c @@ -28,11 +28,32 @@ #include <timestamp.h> #include <arch/cache.h> #include <arch/exception.h> +#include <stdlib.h> +#include <assert.h> #include <vendorcode/google/chromeos/chromeos.h> #include <soc/rockchip/rk3288/sdram.h> #include <soc/rockchip/rk3288/clock.h> +#include <soc/rockchip/rk3288/pwm.h> +#include <soc/rockchip/rk3288/grf.h> #include "timer.h" +static void regulate_vdd_log(unsigned int mv) +{ + unsigned int duty_ns; + const u32 period_ns = 2000; /* pwm period: 2000ns */ + const u32 max_regulator_mv = 1350; /* 1.35V */ + const u32 min_regulator_mv = 870; /* 0.87V */ + + writel(IOMUX_PWM1, &rk3288_grf->iomux_pwm1); + + assert((mv >= min_regulator_mv) && (mv <= max_regulator_mv)); + + duty_ns = (max_regulator_mv - mv) * period_ns / + (max_regulator_mv - min_regulator_mv); + + pwm_init(1, period_ns, duty_ns); +} + void main(void) { #if CONFIG_COLLECT_TIMESTAMPS @@ -49,6 +70,8 @@ void main(void) console_init(); + /* vdd_log 1200mv is enough for ddr run 666Mhz */ + regulate_vdd_log(1200); #if CONFIG_COLLECT_TIMESTAMPS before_dram_time = timestamp_get(); #endif |