diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc-exynos.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc-exynos.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index 86486e6659de..3914024cf415 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -539,6 +539,53 @@ static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host, return 0; } +static void dw_mci_exynos_set_data_timeout(struct dw_mci *host, + unsigned int timeout_ns) +{ + u32 clk_div, tmout; + u64 tmp; + unsigned int tmp2; + + clk_div = (mci_readl(host, CLKDIV) & 0xFF) * 2; + if (clk_div == 0) + clk_div = 1; + + tmp = DIV_ROUND_UP_ULL((u64)timeout_ns * host->bus_hz, NSEC_PER_SEC); + tmp = DIV_ROUND_UP_ULL(tmp, clk_div); + + /* TMOUT[7:0] (RESPONSE_TIMEOUT) */ + tmout = 0xFF; /* Set maximum */ + + /* + * Extended HW timer (max = 0x6FFFFF2): + * ((TMOUT[10:8] - 1) * 0xFFFFFF + TMOUT[31:11] * 8) + */ + if (!tmp || tmp > 0x6FFFFF2) + tmout |= (0xFFFFFF << 8); + else { + /* TMOUT[10:8] */ + tmp2 = (((unsigned int)tmp / 0xFFFFFF) + 1) & 0x7; + tmout |= tmp2 << 8; + + /* TMOUT[31:11] */ + tmp = tmp - ((tmp2 - 1) * 0xFFFFFF); + tmout |= (tmp & 0xFFFFF8) << 8; + } + + mci_writel(host, TMOUT, tmout); + dev_dbg(host->dev, "timeout_ns: %u => TMOUT[31:8]: %#08x", + timeout_ns, tmout >> 8); +} + +static u32 dw_mci_exynos_get_drto_clks(struct dw_mci *host) +{ + u32 drto_clks; + + drto_clks = mci_readl(host, TMOUT) >> 8; + + return (((drto_clks & 0x7) - 1) * 0xFFFFFF) + ((drto_clks & 0xFFFFF8)); +} + /* Common capabilities of Exynos4/Exynos5 SoC */ static unsigned long exynos_dwmmc_caps[4] = { MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA, @@ -564,6 +611,8 @@ static const struct dw_mci_drv_data artpec_drv_data = { .set_ios = dw_mci_exynos_set_ios, .parse_dt = dw_mci_exynos_parse_dt, .execute_tuning = dw_mci_exynos_execute_tuning, + .set_data_timeout = dw_mci_exynos_set_data_timeout, + .get_drto_clks = dw_mci_exynos_get_drto_clks, }; static const struct of_device_id dw_mci_exynos_match[] = { |