diff options
Diffstat (limited to 'src/cpu/samsung')
| -rw-r--r-- | src/cpu/samsung/exynos5420/clock.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/src/cpu/samsung/exynos5420/clock.c b/src/cpu/samsung/exynos5420/clock.c index 7ecb717d75..8a8e58954a 100644 --- a/src/cpu/samsung/exynos5420/clock.c +++ b/src/cpu/samsung/exynos5420/clock.c @@ -333,16 +333,29 @@ int clock_set_dwmci(enum periph_id peripheral) { /* Request MMC clock value to 52MHz. */ const unsigned long freq = 52000000; - unsigned long sclk, div; + unsigned long sdclkin, cclkin; int device_index = (int)peripheral - (int)PERIPH_ID_SDMMC0; ASSERT(device_index >= 0 && device_index < 4); - sclk = get_mmc_clk(device_index); - if (!sclk) { + sdclkin = get_mmc_clk(device_index); + if (!sdclkin) { return -1; } - div = CEIL_DIV(sclk, freq); - set_mmc_clk(device_index, div); + + /* The SDCLKIN is divided insided controller by the DIVRATIO field in + * CLKSEL register, so we must calculate clock value as + * cclk_in = SDCLKIN / (DIVRATIO + 1) + * Currently the RIVRATIO must be 3 for MMC0 and MMC2 on Exynos5420 + * (and must be configured in payload). + */ + if (device_index == 0 || device_index == 2){ + int divratio = 3; + sdclkin /= (divratio + 1); + } + printk(BIOS_DEBUG, "%s(%d): sdclkin: %ld\n", __func__, device_index, sdclkin); + + cclkin = CEIL_DIV(sdclkin, freq); + set_mmc_clk(device_index, cclkin); return 0; } |