diff options
| author | Andre Przywara <andre.przywara@arm.com> | 2024-09-12 02:19:45 +0100 |
|---|---|---|
| committer | Andre Przywara <andre.przywara@arm.com> | 2025-07-27 22:57:35 +0100 |
| commit | 869d396191ed226b66d9fe99e89230b359478d82 (patch) | |
| tree | 6139394c179f737940ec1f59ae4a4981e0e760c9 /drivers/mmc | |
| parent | 14c66b9e3510aa3a6c0f99ba1534c329e38dd94f (diff) | |
sunxi: mmc: add support for Allwinner A523 MMC mod clock
The Allwinner A523 SoC has a slightly changed mod clock, where the P
factor, formerly a shift value, is now a second divider value.
Also the input clock is not PLL_PERIPH0 (600MHz) anymore, but
PLL_PERIPH0_400M (for MMC0/1), so adjust the input rate calculation
accordingly. MMC2 has a different set of parents, so the input clock
is 800 MHz there.
Adjust for all of this.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/sunxi_mmc.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c index 06c1e09bf26..e28c81afffe 100644 --- a/drivers/mmc/sunxi_mmc.c +++ b/drivers/mmc/sunxi_mmc.c @@ -99,6 +99,19 @@ static int mmc_set_mod_clk(struct sunxi_mmc_priv *priv, unsigned int hz) */ if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) pll_hz /= 2; + + /* + * The A523/T527 uses PERIPH0_400M as the MMC0/1 input clock, + * and PERIPH0_800M for MMC2. There is also the hidden divider + * of 2. The clock code reports 600 MHz for PERIPH0. + * Adjust the calculation accordingly: 600 * hidden2 / 3 for + * MMC0/1, and 600 * hidden2 / 3 * 2 for MMC2. + */ + if (IS_ENABLED(CONFIG_MACH_SUN55I_A523)) { + pll_hz /= 3; + if (priv->mmc_no == 2) + pll_hz *= 2; + } } div = pll_hz / hz; @@ -153,6 +166,10 @@ static int mmc_set_mod_clk(struct sunxi_mmc_priv *priv, unsigned int hz) CCM_MMC_CTRL_SCLK_DLY(sclk_dly); } + /* The A523 has a second divider, not a shift. */ + if (IS_ENABLED(CONFIG_MACH_SUN55I_A523)) + n = (1U << n) - 1; + writel(CCM_MMC_CTRL_ENABLE| pll | CCM_MMC_CTRL_N(n) | CCM_MMC_CTRL_M(div) | val, priv->mclkreg); @@ -559,7 +576,8 @@ struct mmc *sunxi_mmc_init(int sdc_no) cfg->host_caps = MMC_MODE_4BIT; if ((IS_ENABLED(CONFIG_MACH_SUN50I) || IS_ENABLED(CONFIG_MACH_SUN8I) || - IS_ENABLED(CONFIG_SUN50I_GEN_H6)) && (sdc_no == 2)) + IS_ENABLED(CONFIG_SUN50I_GEN_H6) || IS_ENABLED(CONFIG_MACH_SUN55I_A523)) && + (sdc_no == 2)) cfg->host_caps = MMC_MODE_8BIT; cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS; |