diff options
| author | huang lin <hl@rock-chips.com> | 2014-09-25 16:33:38 +0800 |
|---|---|---|
| committer | Aaron Durbin <adurbin@google.com> | 2015-04-02 21:16:45 +0200 |
| commit | bfdd732b80a56e31d3bbe59de76a6a91b0f5b9e4 (patch) | |
| tree | 6ab65295596023084a4f08ffa6addc38aae7ab8e /src/mainboard | |
| parent | bbcffd9e25e12a8ee5858ac580aa7e86ecf32ee5 (diff) | |
rockchip: support pwm regulator
BUG=None
TEST=Boot Veyron Pinky and test the VDD_LOG
Original-Change-Id: Ie2eef918e04ba0e13879e915b0b0bef44aef550e
Original-Signed-off-by: huang lin <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/219753
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Commit-Queue: Julius Werner <jwerner@chromium.org>
Change-Id: I444b47564d90b3480b351fdd8460e5b94e71927c
(cherry picked from commit 4491d9c4037161fd8c4cc40856167bf73182fda6)
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9240
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
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 |