diff options
| author | David Hendricks <dhendrix@chromium.org> | 2013-06-22 19:40:43 -0700 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2013-07-10 23:00:17 +0200 |
| commit | be58278a8654ce089dbe94be2193539ef7f26c1e (patch) | |
| tree | 31e9ec0ccc09b9f4cdf23771b366635199f2da16 /src/cpu/samsung/exynos5420 | |
| parent | 2d2e37fc526741a7308b88c794729295a2c5e3cd (diff) | |
exynos5420: use speed parameter in i2c_init() for HSI2C
This allows us to set different speeds for each HSI2C bus.
Change-Id: I50cc257aad9ef50025d0837b0516940b956efc02
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3701
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/samsung/exynos5420')
| -rw-r--r-- | src/cpu/samsung/exynos5420/i2c.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/src/cpu/samsung/exynos5420/i2c.c b/src/cpu/samsung/exynos5420/i2c.c index cbe7a79c0a..b16d068c5c 100644 --- a/src/cpu/samsung/exynos5420/i2c.c +++ b/src/cpu/samsung/exynos5420/i2c.c @@ -93,11 +93,6 @@ #define HSI2C_SLV_ADDR_MAS(x) ((x & 0x3ff) << 10) -/* Controller operating frequency, timing values for operation - * are calculated against this frequency - */ -#define HSI2C_FS_TX_CLOCK 1000000 - /* S3C I2C Controller bits */ #define I2CSTAT_BSY 0x20 /* Busy bit */ #define I2CSTAT_NACK 0x01 /* Nack bit */ @@ -244,11 +239,11 @@ static void i2c_ch_init(struct s3c24x0_i2c_bus *bus, int speed, int slaveadd) write32(I2C_MODE_MT | I2C_TXRX_ENA, &bus->regs->iicstat); } -static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus) +static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus, + unsigned int bus_freq_hz) { struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; unsigned long clkin = clock_get_periph_rate(i2c_bus->periph_id); - unsigned int op_clk = HSI2C_FS_TX_CLOCK; unsigned int i = 0, utemp0 = 0, utemp1 = 0; unsigned int t_ftl_cycle; @@ -259,7 +254,7 @@ static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus) * uTemp2 = TSCLK_L + TSCLK_H */ t_ftl_cycle = (read32(&hsregs->usi_conf) >> 16) & 0x7; - utemp0 = (clkin / op_clk) - 8 - 2 * t_ftl_cycle; + utemp0 = (clkin / bus_freq_hz) - 8 - 2 * t_ftl_cycle; /* CLK_DIV max is 256 */ for (i = 0; i < 256; i++) { @@ -274,7 +269,8 @@ static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus) return -1; } -static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus) +static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus, + unsigned int bus_freq_hz) { struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; unsigned int t_sr_release; @@ -288,7 +284,7 @@ static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus) u32 i2c_timing_s3; u32 i2c_timing_sla; - hsi2c_get_clk_details(i2c_bus); + hsi2c_get_clk_details(i2c_bus, bus_freq_hz); n_clkdiv = i2c_bus->clk_div; t_scl_l = i2c_bus->clk_cycle / 2; @@ -341,7 +337,8 @@ static void i2c_reset(struct s3c24x0_i2c_bus *i2c_bus) write32(i2c_ctl, &i2c->usi_ctl); /* Initialize the configure registers */ - hsi2c_ch_init(i2c_bus); + /* FIXME: This just assumes 100KHz as a default bus freq */ + hsi2c_ch_init(i2c_bus, 100000); } void i2c_init(unsigned bus_num, int speed, int slaveadd) @@ -352,12 +349,8 @@ void i2c_init(unsigned bus_num, int speed, int slaveadd) i2c_reset(i2c); - /* FIXME(dhendrix): hsi2c_ch_init doesn't take a speed or slaveadd - * parameter, so we should split it out and call it directly from - * romstage without the unneeded parameters. - */ if (i2c->is_highspeed) - hsi2c_ch_init(i2c); + hsi2c_ch_init(i2c, speed); else i2c_ch_init(i2c, speed, slaveadd); } |