| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <bcd.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/i2c_simple.h> |
| #include <rtc.h> |
| #include <soc/rk808.h> |
| #include <stdint.h> |
| |
| #if CONFIG_PMIC_BUS < 0 |
| #error "PMIC_BUS must be set in mainboard's Kconfig." |
| #endif |
| |
| #define RK808_ADDR 0x1b |
| |
| #define DCDC_EN 0x23 |
| #define LDO_EN 0x24 |
| #define BUCK1SEL 0x2f |
| #define BUCK4SEL 0x38 |
| #define LDO_ONSEL(i) (0x39 + 2 * i) |
| #define LDO_SLPSEL(i) (0x3a + 2 * i) |
| |
| #define RTC_SECOND 0x00 |
| #define RTC_MINUTE 0x01 |
| #define RTC_HOUR 0x02 |
| #define RTC_DAY 0x03 |
| #define RTC_MONTH 0x04 |
| #define RTC_YEAR 0x05 |
| #define RTC_WEEKS 0x06 |
| #define RTC_CTRL 0x10 |
| #define RTC_STATUS 0x11 |
| |
| #define RTC_CTRL_STOP_RTC (1 << 0) |
| #define RTC_CTRL_GET_TIME (1 << 6) |
| #define RTC_CTRL_RTC_READSEL (1 << 7) |
| |
| #define DCDC_UV_ACT 0x28 |
| #define DCDC_ILMAX 0x90 |
| |
| static int rk808_read(uint8_t reg, uint8_t *value) |
| { |
| return i2c_readb(CONFIG_PMIC_BUS, RK808_ADDR, reg, value); |
| } |
| |
| static int rk808_write(uint8_t reg, uint8_t value) |
| { |
| return i2c_writeb(CONFIG_PMIC_BUS, RK808_ADDR, reg, value); |
| } |
| |
| static void rk808_clrsetbits(uint8_t reg, uint8_t clr, uint8_t set) |
| { |
| uint8_t value; |
| |
| if (rk808_read(reg, &value) || rk808_write(reg, (value & ~clr) | set)) |
| printk(BIOS_ERR, "ERROR: Cannot set Rk808[%#x]!\n", reg); |
| } |
| |
| void rk808_configure_switch(int sw, int enabled) |
| { |
| assert(sw == 1 || sw == 2); |
| rk808_clrsetbits(DCDC_EN, 1 << (sw + 4), !!enabled << (sw + 4)); |
| } |
| |
| void rk808_configure_ldo(int ldo, int millivolts) |
| { |
| uint8_t vsel; |
| |
| if (!millivolts) { |
| rk808_clrsetbits(LDO_EN, 1 << (ldo - 1), 0); |
| return; |
| } |
| |
| switch (ldo) { |
| case 1: |
| case 2: |
| case 4: |
| case 5: |
| case 8: |
| vsel = DIV_ROUND_UP(millivolts, 100) - 18; |
| assert(vsel <= 0x10); |
| break; |
| case 3: |
| case 6: |
| case 7: |
| vsel = DIV_ROUND_UP(millivolts, 100) - 8; |
| assert(vsel <= 0x11); |
| break; |
| default: |
| die("Unknown LDO index!"); |
| } |
| |
| rk808_clrsetbits(LDO_ONSEL(ldo), 0x1f, vsel); |
| rk808_clrsetbits(LDO_EN, 0, 1 << (ldo - 1)); |
| } |
| |
| void rk808_configure_buck(int buck, int millivolts) |
| { |
| uint8_t vsel; |
| uint8_t buck_reg; |
| |
| switch (buck) { |
| case 1: |
| case 2: |
| /* 25mV steps. base = 29 * 25mV = 725 */ |
| vsel = (DIV_ROUND_UP(millivolts, 25) - 29) * 2 + 1; |
| assert(vsel <= 0x3f); |
| buck_reg = BUCK1SEL + 4 * (buck - 1); |
| break; |
| case 4: |
| vsel = DIV_ROUND_UP(millivolts, 100) - 18; |
| assert(vsel <= 0xf); |
| buck_reg = BUCK4SEL; |
| break; |
| default: |
| die("Unknown buck index!"); |
| } |
| rk808_clrsetbits(DCDC_ILMAX, 0, 3 << ((buck - 1) * 2)); |
| |
| /* undervoltage detection may be wrong, disable it */ |
| rk808_clrsetbits(DCDC_UV_ACT, 1 << (buck - 1), 0); |
| |
| rk808_clrsetbits(buck_reg, 0x3f, vsel); |
| rk808_clrsetbits(DCDC_EN, 0, 1 << (buck - 1)); |
| } |
| |
| static void rk808rtc_stop(void) |
| { |
| rk808_clrsetbits(RTC_CTRL, RTC_CTRL_STOP_RTC, 0); |
| } |
| |
| static void rk808rtc_start(void) |
| { |
| rk808_clrsetbits(RTC_CTRL, 0, RTC_CTRL_STOP_RTC); |
| } |
| |
| int rtc_set(const struct rtc_time *time) |
| { |
| int ret = 0; |
| |
| /* RTC time can only be set when RTC is frozen */ |
| rk808rtc_stop(); |
| |
| ret |= rk808_write(RTC_SECOND, bin2bcd(time->sec)); |
| ret |= rk808_write(RTC_MINUTE, bin2bcd(time->min)); |
| ret |= rk808_write(RTC_HOUR, bin2bcd(time->hour)); |
| ret |= rk808_write(RTC_DAY, bin2bcd(time->mday)); |
| ret |= rk808_write(RTC_MONTH, bin2bcd(time->mon)); |
| ret |= rk808_write(RTC_YEAR, bin2bcd(time->year)); |
| |
| rk808rtc_start(); |
| return ret; |
| } |
| |
| int rtc_get(struct rtc_time *time) |
| { |
| uint8_t value; |
| int ret = 0; |
| |
| /* |
| * Set RTC_READSEL to cause reads to access shadow registers and |
| * transition GET_TIME from 0 to 1 to cause dynamic register content |
| * to be copied into shadow registers. This ensures a coherent reading |
| * of time values as we access each register using slow I2C transfers. |
| */ |
| rk808_clrsetbits(RTC_CTRL, RTC_CTRL_GET_TIME, 0); |
| rk808_clrsetbits(RTC_CTRL, 0, RTC_CTRL_GET_TIME | RTC_CTRL_RTC_READSEL); |
| |
| /* |
| * After we set the GET_TIME bit, the rtc time can't be read |
| * immediately. So we should wait up to 31.25 us. |
| */ |
| udelay(32); |
| |
| ret |= rk808_read(RTC_SECOND, &value); |
| time->sec = bcd2bin(value & 0x7f); |
| |
| ret |= rk808_read(RTC_MINUTE, &value); |
| time->min = bcd2bin(value & 0x7f); |
| |
| ret |= rk808_read(RTC_HOUR, &value); |
| time->hour = bcd2bin(value & 0x3f); |
| |
| ret |= rk808_read(RTC_DAY, &value); |
| time->mday = bcd2bin(value & 0x3f); |
| |
| ret |= rk808_read(RTC_MONTH, &value); |
| time->mon = bcd2bin(value & 0x1f); |
| |
| ret |= rk808_read(RTC_YEAR, &value); |
| time->year = bcd2bin(value); |
| |
| time->wday = -1; /* unknown */ |
| |
| return ret; |
| } |