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authorDavid Hendricks <dhendrix@chromium.org>2015-01-12 14:08:10 -0800
committerStefan Reinauer <stefan.reinauer@coreboot.org>2015-04-15 16:47:04 +0200
commit3c4951e05f2d3e0265ad892a3a229c1b508c29a8 (patch)
treeb9897fbdda9549ca6ffbfb3bde622e00a7e02b7e /src
parent4d244214ce56dc89abd74a5d0ee45e77ca61c279 (diff)
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>
Diffstat (limited to 'src')
-rw-r--r--src/soc/rockchip/rk3288/rk808.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/soc/rockchip/rk3288/rk808.c b/src/soc/rockchip/rk3288/rk808.c
index de19a55135..b763454903 100644
--- a/src/soc/rockchip/rk3288/rk808.c
+++ b/src/soc/rockchip/rk3288/rk808.c
@@ -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;
+}