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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Rockchip Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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;
}
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