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rk808: Implement RTC driver 

This adds RTC functions to the existing RK808 driver.

BUG=chrome-os-partner:34436
BRANCH=none
TEST=with eventlog patches applied to pinky, booted and saw eventlog
entries generated with correct timestamps:
localhost ~ # mosys -k eventlog list
entry="0" timestamp="2015-01-06 13:45:33" type="Log area cleared" bytes="4096"
entry="1" timestamp="2015-01-06 13:45:33" type="System boot" count="0"
entry="2" timestamp="2015-01-06 13:45:33" type="Chrome OS Developer Mode"

Change-Id: I1df70a2ca94ff463ffea8d9f02d951d6c62e6b08
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: a304f7e6954f585f04feef54c4902dcb25a39fcc
Original-Signed-off-by: David Hendricks <dhendrix@chromium.org>
Original-Change-Id: I3a240e342a54b2e7023da71708d0d70f5131f0b9
Original-Reviewed-on: https://chromium-review.googlesource.com/238525
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Commit-Queue: Julius Werner <jwerner@chromium.org>
Original-Tested-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9643
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
This commit is contained in:
David Hendricks 2015-01-12 14:08:10 -08:00 committed by Stefan Reinauer
parent 4d244214ce
commit 3c4951e05f
1 changed files with 79 additions and 0 deletions
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79
src/soc/rockchip/rk3288/rk808.c
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@ -18,9 +18,11 @@
*/
#include <assert.h>
#include <bcd.h>
#include <console/console.h>
#include <delay.h>
#include <device/i2c.h>
#include <rtc.h>
#include <soc/rk808.h>
#include <stdint.h>
#include <stdlib.h>
@ -38,6 +40,20 @@
#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)
static int rk808_read(uint8_t reg, uint8_t *value)
{
return i2c_readb(CONFIG_PMIC_BUS, RK808_ADDR, reg, value);
@ -118,3 +134,66 @@ void rk808_configure_buck(int buck, int millivolts)
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);
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);
return ret;
}