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-rw-r--r--src/drivers/i2c/rx6110sa/Kconfig7
-rw-r--r--src/drivers/i2c/rx6110sa/rx6110sa.c90
2 files changed, 60 insertions, 37 deletions
diff --git a/src/drivers/i2c/rx6110sa/Kconfig b/src/drivers/i2c/rx6110sa/Kconfig
index a5608f82f7..48654c6083 100644
--- a/src/drivers/i2c/rx6110sa/Kconfig
+++ b/src/drivers/i2c/rx6110sa/Kconfig
@@ -3,3 +3,10 @@ config DRIVERS_I2C_RX6110SA
default n
help
Enable support for external RTC chip RX6110 SA.
+
+config RX6110SA_USE_SMBUS
+ bool
+ default n
+ help
+ Select this option if the RTC RX6110SA is connected to a SMBus controller.
+ If not selected I2C controller is used instead.
diff --git a/src/drivers/i2c/rx6110sa/rx6110sa.c b/src/drivers/i2c/rx6110sa/rx6110sa.c
index 743b708c19..9d60bdb7e1 100644
--- a/src/drivers/i2c/rx6110sa/rx6110sa.c
+++ b/src/drivers/i2c/rx6110sa/rx6110sa.c
@@ -14,6 +14,7 @@
*/
#include <device/i2c.h>
+#include <device/smbus.h>
#include <device/device.h>
#include <version.h>
#include <console/console.h>
@@ -24,17 +25,34 @@
#define I2C_BUS_NUM (dev->bus->secondary - 1)
#define I2C_DEV_NUM (dev->path.i2c.device)
+/* Function to write a register in the RTC with the given value. */
+static void rx6110sa_write(struct device *dev, uint8_t reg, uint8_t val)
+{
+ if (IS_ENABLED(CONFIG_RX6110SA_USE_SMBUS))
+ smbus_write_byte(dev, reg, val);
+ else
+ i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, reg, val);
+}
+
+/* Function to read a register in the RTC. */
+static uint8_t rx6110sa_read(struct device *dev, uint8_t reg)
+{
+ uint8_t val = 0;
+
+ if (IS_ENABLED(CONFIG_RX6110SA_USE_SMBUS))
+ val = smbus_read_byte(dev, reg);
+ else
+ i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, reg, &val);
+ return val;
+}
+
/* Set RTC date from coreboot build date. */
static void rx6110sa_set_build_date(struct device *dev)
{
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG,
- coreboot_build_date.year);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG,
- coreboot_build_date.month);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG,
- coreboot_build_date.day);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, WEEK_REG,
- (1 << coreboot_build_date.weekday));
+ rx6110sa_write(dev, YEAR_REG, coreboot_build_date.year);
+ rx6110sa_write(dev, MONTH_REG, coreboot_build_date.month);
+ rx6110sa_write(dev, DAY_REG, coreboot_build_date.day);
+ rx6110sa_write(dev, WEEK_REG, (1 << coreboot_build_date.weekday));
}
/* Set RTC date from user defined date (available in e.g. device tree). */
@@ -42,14 +60,10 @@ static void rx6110sa_set_user_date(struct device *dev)
{
struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG,
- bin2bcd(config->user_year));
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG,
- bin2bcd(config->user_month));
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG,
- bin2bcd(config->user_day));
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, WEEK_REG,
- (1 << config->user_weekday));
+ rx6110sa_write(dev, YEAR_REG, bin2bcd(config->user_year));
+ rx6110sa_write(dev, MONTH_REG, bin2bcd(config->user_month));
+ rx6110sa_write(dev, DAY_REG, bin2bcd(config->user_day));
+ rx6110sa_write(dev, WEEK_REG, (1 << config->user_weekday));
}
static void rx6110sa_final(struct device *dev)
@@ -57,12 +71,12 @@ static void rx6110sa_final(struct device *dev)
uint8_t hour, minute, second, year, month, day;
/* Read back current RTC date and time and print it to the console. */
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, HOUR_REG, &hour);
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, MINUTE_REG, &minute);
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, &second);
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, YEAR_REG, &year);
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, MONTH_REG, &month);
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, DAY_REG, &day);
+ hour = rx6110sa_read(dev, HOUR_REG);
+ minute = rx6110sa_read(dev, MINUTE_REG);
+ second = rx6110sa_read(dev, SECOND_REG);
+ year = rx6110sa_read(dev, YEAR_REG);
+ month = rx6110sa_read(dev, MONTH_REG);
+ day = rx6110sa_read(dev, DAY_REG);
printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n",
dev->chip_ops->name, bcd2bin(month), bcd2bin(day),
@@ -75,13 +89,13 @@ static void rx6110sa_init(struct device *dev)
uint8_t reg;
/* Do a dummy read first. */
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, &reg);
+ reg = rx6110sa_read(dev, SECOND_REG);
/*
* Check VLF-bit which indicates the RTC data loss, such as due to a
* supply voltage drop.
*/
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, &reg);
+ reg = rx6110sa_read(dev, FLAG_REGISTER);
if (!(reg & VLF_BIT))
/* No voltage low detected, everything is well. */
@@ -91,24 +105,26 @@ static void rx6110sa_init(struct device *dev)
* Voltage low detected, initialize RX6110 SA again.
* Set first some registers to known state.
*/
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, BATTERY_BACKUP_REG, 0x00);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, RESERVED_BIT_REG, RTC_INIT_VALUE);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, DIGITAL_REG, 0x00);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, IRQ_CONTROL_REG, 0x00);
+ rx6110sa_write(dev, BATTERY_BACKUP_REG, 0x00);
+ rx6110sa_write(dev, RESERVED_BIT_REG, RTC_INIT_VALUE);
+ rx6110sa_write(dev, DIGITAL_REG, 0x00);
+ rx6110sa_write(dev, IRQ_CONTROL_REG, 0x00);
/* Clear timer enable bit and set frequency of clock output. */
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, EXTENSION_REG, &reg);
+
+ reg = rx6110sa_read(dev, EXTENSION_REG);
reg &= ~(FSEL_MASK | TE_BIT);
reg |= (config->cof_selection << 6);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, EXTENSION_REG, reg);
+ rx6110sa_write(dev, EXTENSION_REG, reg);
/* Clear voltage low detect bit. */
- i2c_readb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, &reg);
+ reg = rx6110sa_read(dev, FLAG_REGISTER);
reg &= ~VLF_BIT;
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, FLAG_REGISTER, reg);
+ rx6110sa_write(dev, FLAG_REGISTER, reg);
/* Before setting the clock stop oscillator. */
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, CTRL_REG, STOP_BIT);
+ rx6110sa_write(dev, CTRL_REG, STOP_BIT);
+
if (config->set_user_date) {
/* Set user date defined in device tree. */
printk(BIOS_DEBUG, "%s: Set to user date\n",
@@ -120,11 +136,11 @@ static void rx6110sa_init(struct device *dev)
dev->chip_ops->name);
rx6110sa_set_build_date(dev);
}
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, HOUR_REG, 1);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, MINUTE_REG, 0);
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, SECOND_REG, 0);
+ rx6110sa_write(dev, HOUR_REG, 1);
+ rx6110sa_write(dev, MINUTE_REG, 0);
+ rx6110sa_write(dev, SECOND_REG, 0);
/* Start oscillator again as the RTC is set up now. */
- i2c_writeb(I2C_BUS_NUM, I2C_DEV_NUM, CTRL_REG, 0x00);
+ rx6110sa_write(dev, CTRL_REG, 0x00);
}
static struct device_operations rx6110sa_ops = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-08 17:16:18 +0000