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-rw-r--r--src/soc/rockchip/rk3399/romstage.c44
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);