diff options
Diffstat (limited to 'plat')
| -rw-r--r-- | plat/allwinner/sun50i_a64/sunxi_power.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/plat/allwinner/sun50i_a64/sunxi_power.c b/plat/allwinner/sun50i_a64/sunxi_power.c index 0d73371a8..9a2733996 100644 --- a/plat/allwinner/sun50i_a64/sunxi_power.c +++ b/plat/allwinner/sun50i_a64/sunxi_power.c @@ -113,6 +113,11 @@ static int rsb_init(void) AXP803_RT_ADDR); } +static int axp_write(uint8_t reg, uint8_t val) +{ + return rsb_write(AXP803_RT_ADDR, reg, val); +} + static int axp_setbits(uint8_t reg, uint8_t set_mask) { uint8_t regval; @@ -136,6 +141,79 @@ static bool should_enable_regulator(const void *fdt, int node) return false; } +/* + * Retrieve the voltage from a given regulator DTB node. + * Both the regulator-{min,max}-microvolt properties must be present and + * have the same value. Return that value in millivolts. + */ +static int fdt_get_regulator_millivolt(const void *fdt, int node) +{ + const fdt32_t *prop; + uint32_t min_volt; + + prop = fdt_getprop(fdt, node, "regulator-min-microvolt", NULL); + if (prop == NULL) + return -EINVAL; + min_volt = fdt32_to_cpu(*prop); + + prop = fdt_getprop(fdt, node, "regulator-max-microvolt", NULL); + if (prop == NULL) + return -EINVAL; + + if (fdt32_to_cpu(*prop) != min_volt) + return -EINVAL; + + return min_volt / 1000; +} + +#define NO_SPLIT 0xff + +struct axp_regulator { + char *dt_name; + uint16_t min_volt; + uint16_t max_volt; + uint16_t step; + unsigned char split; + unsigned char volt_reg; + unsigned char switch_reg; + unsigned char switch_bit; +} regulators[] = { + {"dcdc1", 1600, 3400, 100, NO_SPLIT, 0x20, 0xff, 9}, + {"dcdc5", 800, 1840, 10, 32, 0x24, 0xff, 9}, + {"dldo1", 700, 3300, 100, NO_SPLIT, 0x15, 0x12, 3}, + {"dldo2", 700, 4200, 100, 27, 0x16, 0x12, 4}, + {"dldo3", 700, 3300, 100, NO_SPLIT, 0x17, 0x12, 5}, + {"fldo1", 700, 1450, 50, NO_SPLIT, 0x1c, 0x13, 2}, + {} +}; + +static int setup_regulator(const void *fdt, int node, + const struct axp_regulator *reg) +{ + int mvolt; + uint8_t regval; + + if (!should_enable_regulator(fdt, node)) + return -ENOENT; + + mvolt = fdt_get_regulator_millivolt(fdt, node); + if (mvolt < reg->min_volt || mvolt > reg->max_volt) + return -EINVAL; + + regval = (mvolt / reg->step) - (reg->min_volt / reg->step); + if (regval > reg->split) + regval = ((regval - reg->split) / 2) + reg->split; + + axp_write(reg->volt_reg, regval); + if (reg->switch_reg < 0xff) + axp_setbits(reg->switch_reg, BIT(reg->switch_bit)); + + INFO("PMIC: AXP803: %s voltage: %d.%03dV\n", reg->dt_name, + mvolt / 1000, mvolt % 1000); + + return 0; +} + static void setup_axp803_rails(const void *fdt) { int node; @@ -157,6 +235,7 @@ static void setup_axp803_rails(const void *fdt) for (node = fdt_first_subnode(fdt, node); node != -FDT_ERR_NOTFOUND; node = fdt_next_subnode(fdt, node)) { + struct axp_regulator *reg; const char *name; int length; @@ -165,6 +244,13 @@ static void setup_axp803_rails(const void *fdt) continue; name = fdt_get_name(fdt, node, &length); + for (reg = regulators; reg->dt_name; reg++) { + if (!strncmp(name, reg->dt_name, length)) { + setup_regulator(fdt, node, reg); + break; + } + } + if (!strncmp(name, "dc1sw", length)) { INFO("PMIC: AXP803: Enabling DC1SW\n"); axp_setbits(0x12, BIT(7)); |