diff options
Diffstat (limited to 'drivers/rtc/abx80x.c')
| -rw-r--r-- | drivers/rtc/abx80x.c | 68 |
1 files changed, 51 insertions, 17 deletions
diff --git a/drivers/rtc/abx80x.c b/drivers/rtc/abx80x.c index 528b06cbd6..823aff03f5 100644 --- a/drivers/rtc/abx80x.c +++ b/drivers/rtc/abx80x.c @@ -17,6 +17,7 @@ #include <i2c.h> #include <rtc.h> #include <log.h> +#include <linux/bitfield.h> #define ABX8XX_REG_HTH 0x00 #define ABX8XX_REG_SC 0x01 @@ -88,6 +89,16 @@ #define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 #define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 +#define ABX8XX_REG_EXTRAM 0x3f +#define ABX8XX_EXTRAM_XADS GENMASK(1, 0) + +#define ABX8XX_SRAM_BASE 0x40 +#define ABX8XX_SRAM_WIN_SIZE 0x40U +#define ABX8XX_RAM_SIZE 256 + +#define RAM_ADDR_LOWER GENMASK(5, 0) +#define RAM_ADDR_UPPER GENMASK(7, 6) + static u8 trickle_resistors[] = {0, 3, 6, 11}; enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, @@ -112,29 +123,52 @@ static struct abx80x_cap abx80x_caps[] = { [ABX80X] = {.pn = 0} }; -static int abx80x_rtc_read8(struct udevice *dev, unsigned int reg) +static int abx80x_rtc_xfer(struct udevice *dev, unsigned int offset, + u8 *val, unsigned int bytes, bool write) { - int ret = 0; - u8 buf; + int ret; - if (reg > 0xff) + if (offset + bytes > ABX8XX_RAM_SIZE) return -EINVAL; - ret = dm_i2c_read(dev, reg, &buf, sizeof(buf)); - if (ret < 0) - return ret; + while (bytes) { + u8 extram, reg, len, lower, upper; + + lower = FIELD_GET(RAM_ADDR_LOWER, offset); + upper = FIELD_GET(RAM_ADDR_UPPER, offset); + extram = FIELD_PREP(ABX8XX_EXTRAM_XADS, upper); + reg = ABX8XX_SRAM_BASE + lower; + len = min(lower + bytes, ABX8XX_SRAM_WIN_SIZE) - lower; + + ret = dm_i2c_reg_write(dev, ABX8XX_REG_EXTRAM, extram); + if (ret) + return ret; + + if (write) + ret = dm_i2c_write(dev, reg, val, len); + else + ret = dm_i2c_read(dev, reg, val, len); + if (ret) + return ret; + + offset += len; + val += len; + bytes -= len; + } - return buf; + return 0; } -static int abx80x_rtc_write8(struct udevice *dev, unsigned int reg, int val) +static int abx80x_rtc_read(struct udevice *dev, unsigned int offset, u8 *val, + unsigned int bytes) { - u8 buf = (u8)val; - - if (reg > 0xff) - return -EINVAL; + return abx80x_rtc_xfer(dev, offset, val, bytes, false); +} - return dm_i2c_write(dev, reg, &buf, sizeof(buf)); +static int abx80x_rtc_write(struct udevice *dev, unsigned int offset, + const u8 *val, unsigned int bytes) +{ + return abx80x_rtc_xfer(dev, offset, (u8 *)val, bytes, true); } static int abx80x_is_rc_mode(struct udevice *dev) @@ -334,9 +368,9 @@ static int abx80x_rtc_reset(struct udevice *dev) static const struct rtc_ops abx80x_rtc_ops = { .get = abx80x_rtc_read_time, .set = abx80x_rtc_set_time, - .reset = abx80x_rtc_reset, - .read8 = abx80x_rtc_read8, - .write8 = abx80x_rtc_write8 + .reset = abx80x_rtc_reset, + .read = abx80x_rtc_read, + .write = abx80x_rtc_write, }; static int abx80x_dt_trickle_cfg(struct udevice *dev) |