Introduce the CONFIG_LDO_ENABLED_MODE option so that i.MX7ULP boards designed to operate with LDO enabled mode can work with 0.95V at LDO output in RUN mode as per the datasheet.
Signed-off-by: Fabio Estevam festevam@gmail.com --- Changes since v2: - None
arch/arm/mach-imx/mx7ulp/Kconfig | 5 +++ arch/arm/mach-imx/mx7ulp/soc.c | 58 ++++++++++++++++++++++++++++++++ 2 files changed, 63 insertions(+)
diff --git a/arch/arm/mach-imx/mx7ulp/Kconfig b/arch/arm/mach-imx/mx7ulp/Kconfig index ed5f0aeb2d..138c58363f 100644 --- a/arch/arm/mach-imx/mx7ulp/Kconfig +++ b/arch/arm/mach-imx/mx7ulp/Kconfig @@ -3,6 +3,11 @@ if ARCH_MX7ULP config SYS_SOC default "mx7ulp"
+config LDO_ENABLED_MODE + bool "i.MX7ULP LDO Enabled Mode" + help + Select this option to enable the PMC1 LDO. + config MX7ULP bool
diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c index b9a108a514..751575c95e 100644 --- a/arch/arm/mach-imx/mx7ulp/soc.c +++ b/arch/arm/mach-imx/mx7ulp/soc.c @@ -9,6 +9,22 @@ #include <asm/mach-imx/boot_mode.h> #include <asm/mach-imx/hab.h>
+#define PMC0_BASE_ADDR 0x410a1000 +#define PMC0_CTRL 0x28 +#define PMC0_CTRL_LDOEN BIT(31) +#define PMC0_CTRL_LDOOKDIS BIT(30) +#define PMC0_CTRL_PMC1ON BIT(24) +#define PMC1_BASE_ADDR 0x40400000 +#define PMC1_RUN 0x8 +#define PMC1_STOP 0x10 +#define PMC1_VLPS 0x14 +#define PMC1_RUN_LDOVL_SHIFT 16 +#define PMC1_RUN_LDOVL_MASK (0x3f << PMC1_RUN_LDOVL_SHIFT) +#define PMC1_RUN_LDOVL_900 0x1e +#define PMC1_RUN_LDOVL_950 0x23 +#define PMC1_STATUS 0x20 +#define PMC1_STATUS_LDOVLF BIT(8) + static char *get_reset_cause(char *);
#if defined(CONFIG_IMX_HAB) @@ -100,6 +116,44 @@ void init_wdog(void) disable_wdog(WDG2_RBASE); }
+#if defined(CONFIG_LDO_ENABLED_MODE) +static void init_ldo_mode(void) +{ + unsigned int reg; + + /* Set LDOOKDIS */ + setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOOKDIS); + + /* Set LDOVL to 0.95V in PMC1_RUN */ + reg = readl(PMC1_BASE_ADDR + PMC1_RUN); + reg &= ~PMC1_RUN_LDOVL_MASK; + reg |= (PMC1_RUN_LDOVL_950 << PMC1_RUN_LDOVL_SHIFT); + writel(PMC1_BASE_ADDR + PMC1_RUN, reg); + + /* Wait for LDOVLF to be cleared */ + reg = readl(PMC1_BASE_ADDR + PMC1_STATUS); + while (reg & PMC1_STATUS_LDOVLF) + ; + + /* Set LDOVL to 0.95V in PMC1_STOP */ + reg = readl(PMC1_BASE_ADDR + PMC1_STOP); + reg &= ~PMC1_RUN_LDOVL_MASK; + reg |= (PMC1_RUN_LDOVL_950 << PMC1_RUN_LDOVL_SHIFT); + writel(PMC1_BASE_ADDR + PMC1_STOP, reg); + + /* Set LDOVL to 0.90V in PMC1_VLPS */ + reg = readl(PMC1_BASE_ADDR + PMC1_VLPS); + reg &= ~PMC1_RUN_LDOVL_MASK; + reg |= (PMC1_RUN_LDOVL_900 << PMC1_RUN_LDOVL_SHIFT); + writel(PMC1_BASE_ADDR + PMC1_VLPS, reg); + + /* Set LDOEN bit */ + setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOEN); + + /* Set the PMC1ON bit */ + setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_PMC1ON); +} +#endif
void s_init(void) { @@ -113,6 +167,10 @@ void s_init(void) /* enable dumb pmic */ writel((readl(SNVS_LP_LPCR) | SNVS_LPCR_DPEN), SNVS_LP_LPCR); } + +#if defined(CONFIG_LDO_ENABLED_MODE) + init_ldo_mode(); +#endif return; }