diff options
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/rockchip/rk3399/romstage.c | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/src/soc/rockchip/rk3399/romstage.c b/src/soc/rockchip/rk3399/romstage.c index 05c853eb84..f22b8c9116 100644 --- a/src/soc/rockchip/rk3399/romstage.c +++ b/src/soc/rockchip/rk3399/romstage.c @@ -24,19 +24,61 @@ #include <delay.h> #include <program_loading.h> #include <romstage_handoff.h> -#include <symbols.h> #include <soc/addressmap.h> +#include <soc/grf.h> #include <soc/mmu_operations.h> +#include <soc/pwm.h> #include <soc/sdram.h> +#include <symbols.h> static const uint64_t dram_size = (uint64_t)min((uint64_t)CONFIG_DRAM_SIZE_MB * MiB, MAX_DRAM_ADDRESS); +static void init_dvs_outputs(void) +{ + uint32_t i; + + write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0); /* GPU */ + write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1); /* Big */ + write32(&rk3399_pmugrf->iomux_pwm_2, IOMUX_PWM_2); /* Little */ + write32(&rk3399_pmugrf->iomux_pwm_3a, IOMUX_PWM_3_A); /* Centerlog */ + + /* + * Notes: + * + * design_min = 0.8 + * design_max = 1.5 + * + * period = 3333 # 300 kHz + * volt = 1.1 + * + * # Intentionally round down (higher volt) to be safe. + * int((period / (design_max - design_min)) * (design_max - volt)) + * + * Tested on kevin rev0 board 82 w/ all 4 PWMs: + * + * period = 3333, volt = 1.1: 1904 -- Worked for me! + * period = 3333, volt = 1.0: 2380 -- Bad + * period = 3333, volt = 0.9: 2856 -- Bad + * + * period = 25000, volt = 1.1: 14285 -- Bad + * period = 25000, volt = 1.0: 17857 -- Bad + * + * TODO: Almost certainly we don't need all 4 PWMs set to the same + * thing. We should experiment + */ + for (i = 0; i < 4; i++) + pwm_init(i, 3333, 1904); +} + void main(void) { console_init(); exception_init(); + /* Init DVS to conservative values. */ + init_dvs_outputs(); + sdram_init(get_sdram_config()); mmu_config_range((void *)0, (uintptr_t)dram_size, CACHED_MEM); |