stm32mp1: ram: add support for LPDDR2/LPDDR3
Manage power supply configuration for board using stpmic1
with LPDDR2 or with LPDDR3:
+ VDD_DDR1 = 1.8V with BUCK3 (bypass if possible)
+ VDD_DDR2 = 1.2V with BUCK2
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr.c b/drivers/ram/stm32mp1/stm32mp1_ddr.c
index 5e1041d..cfd223e 100644
--- a/drivers/ram/stm32mp1/stm32mp1_ddr.c
+++ b/drivers/ram/stm32mp1/stm32mp1_ddr.c
@@ -372,7 +372,7 @@
}
/* board-specific DDR power initializations. */
-__weak int board_ddr_power_init(void)
+__weak int board_ddr_power_init(enum ddr_type ddr_type)
{
return 0;
}
@@ -382,9 +382,14 @@
const struct stm32mp1_ddr_config *config)
{
u32 pir;
- int ret;
+ int ret = -EINVAL;
- ret = board_ddr_power_init();
+ if (config->c_reg.mstr & DDRCTRL_MSTR_DDR3)
+ ret = board_ddr_power_init(STM32MP_DDR3);
+ else if (config->c_reg.mstr & DDRCTRL_MSTR_LPDDR2)
+ ret = board_ddr_power_init(STM32MP_LPDDR2);
+ else if (config->c_reg.mstr & DDRCTRL_MSTR_LPDDR3)
+ ret = board_ddr_power_init(STM32MP_LPDDR3);
if (ret)
panic("ddr power init failed\n");
diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h b/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h
index a606b2b..97f268e 100644
--- a/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h
+++ b/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h
@@ -234,6 +234,8 @@
/* DDRCTRL REGISTERS */
#define DDRCTRL_MSTR_DDR3 BIT(0)
+#define DDRCTRL_MSTR_LPDDR2 BIT(2)
+#define DDRCTRL_MSTR_LPDDR3 BIT(3)
#define DDRCTRL_MSTR_DATA_BUS_WIDTH_MASK GENMASK(13, 12)
#define DDRCTRL_MSTR_DATA_BUS_WIDTH_FULL (0 << 12)
#define DDRCTRL_MSTR_DATA_BUS_WIDTH_HALF (1 << 12)