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author | Yifeng Zhao <yifeng.zhao@rock-chips.com> | 2022-05-04 23:32:41 +0200 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2022-07-12 12:25:32 +0200 |
commit | c6f361cba51c536e7a6af31973c6a4e5d7e4e2e4 (patch) | |
tree | 3c6f0932c23bfc772ac21eaaec46be164abee38b /drivers/mmc | |
parent | 86e1a8e1f9b555af342c53ae06284eeeab9a4263 (diff) | |
download | linux-c6f361cba51c536e7a6af31973c6a4e5d7e4e2e4.tar.gz linux-c6f361cba51c536e7a6af31973c6a4e5d7e4e2e4.tar.bz2 linux-c6f361cba51c536e7a6af31973c6a4e5d7e4e2e4.zip |
mmc: sdhci-of-dwcmshc: add support for rk3588
Add support for RK3588's DWCMSHC controller, which is used for
providing the rootfs on the RK3588 evaluation board.
Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
[port from vendor BSP]
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20220504213251.264819-12-sebastian.reichel@collabora.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/host/sdhci-of-dwcmshc.c | 121 |
1 files changed, 103 insertions, 18 deletions
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index f5fd88c7adef..4e904850973c 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -31,6 +31,7 @@ /* Offset inside the vendor area 1 */ #define DWCMSHC_HOST_CTRL3 0x8 #define DWCMSHC_EMMC_CONTROL 0x2c +#define DWCMSHC_CARD_IS_EMMC BIT(0) #define DWCMSHC_ENHANCED_STROBE BIT(8) #define DWCMSHC_EMMC_ATCTRL 0x40 @@ -39,7 +40,7 @@ #define DWCMSHC_EMMC_DLL_RXCLK 0x804 #define DWCMSHC_EMMC_DLL_TXCLK 0x808 #define DWCMSHC_EMMC_DLL_STRBIN 0x80c -#define DLL_STRBIN_TAPNUM_FROM_SW BIT(24) +#define DECMSHC_EMMC_DLL_CMDOUT 0x810 #define DWCMSHC_EMMC_DLL_STATUS0 0x840 #define DWCMSHC_EMMC_DLL_START BIT(0) #define DWCMSHC_EMMC_DLL_LOCKED BIT(8) @@ -48,11 +49,21 @@ #define DWCMSHC_EMMC_DLL_START_POINT 16 #define DWCMSHC_EMMC_DLL_INC 8 #define DWCMSHC_EMMC_DLL_DLYENA BIT(27) -#define DLL_TXCLK_TAPNUM_DEFAULT 0x8 -#define DLL_STRBIN_TAPNUM_DEFAULT 0x8 +#define DLL_TXCLK_TAPNUM_DEFAULT 0x10 +#define DLL_TXCLK_TAPNUM_90_DEGREES 0xA #define DLL_TXCLK_TAPNUM_FROM_SW BIT(24) +#define DLL_STRBIN_TAPNUM_DEFAULT 0x8 +#define DLL_STRBIN_TAPNUM_FROM_SW BIT(24) +#define DLL_STRBIN_DELAY_NUM_SEL BIT(26) +#define DLL_STRBIN_DELAY_NUM_OFFSET 16 +#define DLL_STRBIN_DELAY_NUM_DEFAULT 0x16 #define DLL_RXCLK_NO_INVERTER 1 #define DLL_RXCLK_INVERTER 0 +#define DLL_CMDOUT_TAPNUM_90_DEGREES 0x8 +#define DLL_CMDOUT_TAPNUM_FROM_SW BIT(24) +#define DLL_CMDOUT_SRC_CLK_NEG BIT(28) +#define DLL_CMDOUT_EN_SRC_CLK_NEG BIT(29) + #define DLL_LOCK_WO_TMOUT(x) \ ((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \ (((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0)) @@ -61,10 +72,16 @@ #define BOUNDARY_OK(addr, len) \ ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) +enum dwcmshc_rk_type { + DWCMSHC_RK3568, + DWCMSHC_RK3588, +}; + struct rk35xx_priv { /* Rockchip specified optional clocks */ struct clk_bulk_data rockchip_clks[RK35xx_MAX_CLKS]; struct reset_control *reset; + enum dwcmshc_rk_type devtype; u8 txclk_tapnum; }; @@ -133,7 +150,9 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, unsigned int timing) { - u16 ctrl_2; + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u16 ctrl, ctrl_2; ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); /* Select Bus Speed Mode for host */ @@ -151,8 +170,15 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, else if ((timing == MMC_TIMING_UHS_DDR50) || (timing == MMC_TIMING_MMC_DDR52)) ctrl_2 |= SDHCI_CTRL_UHS_DDR50; - else if (timing == MMC_TIMING_MMC_HS400) + else if (timing == MMC_TIMING_MMC_HS400) { + /* set CARD_IS_EMMC bit to enable Data Strobe for HS400 */ + ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); + ctrl |= DWCMSHC_CARD_IS_EMMC; + sdhci_writew(host, ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); + ctrl_2 |= DWCMSHC_CTRL_HS400; + } + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); } @@ -185,17 +211,11 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock host->mmc->actual_clock = 0; - /* - * DO NOT TOUCH THIS SETTING. RX clk inverter unit is enabled - * by default, but it shouldn't be enabled. We should anyway - * disable it before issuing any cmds. - */ - extra = DWCMSHC_EMMC_DLL_DLYENA | - DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL; - sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK); - - if (clock == 0) + if (clock == 0) { + /* Disable interface clock at initial state. */ + sdhci_set_clock(host, clock); return; + } /* Rockchip platform only support 375KHz for identify mode */ if (clock <= 400000) @@ -213,9 +233,21 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock extra &= ~BIT(0); sdhci_writel(host, extra, reg); - if (clock <= 400000) { - /* Disable DLL to reset sample clock */ + if (clock <= 52000000) { + /* Disable DLL and reset both of sample and drive clock */ sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL); + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_RXCLK); + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK); + sdhci_writel(host, 0, DECMSHC_EMMC_DLL_CMDOUT); + /* + * Before switching to hs400es mode, the driver will enable + * enhanced strobe first. PHY needs to configure the parameters + * of enhanced strobe first. + */ + extra = DWCMSHC_EMMC_DLL_DLYENA | + DLL_STRBIN_DELAY_NUM_SEL | + DLL_STRBIN_DELAY_NUM_DEFAULT << DLL_STRBIN_DELAY_NUM_OFFSET; + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_STRBIN); return; } @@ -224,6 +256,15 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock udelay(1); sdhci_writel(host, 0x0, DWCMSHC_EMMC_DLL_CTRL); + /* + * We shouldn't set DLL_RXCLK_NO_INVERTER for identify mode but + * we must set it in higher speed mode. + */ + extra = DWCMSHC_EMMC_DLL_DLYENA; + if (priv->devtype == DWCMSHC_RK3568) + extra |= DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL; + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK); + /* Init DLL settings */ extra = 0x5 << DWCMSHC_EMMC_DLL_START_POINT | 0x2 << DWCMSHC_EMMC_DLL_INC | @@ -246,8 +287,20 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock host->mmc->ios.timing == MMC_TIMING_MMC_HS400) txclk_tapnum = priv->txclk_tapnum; + if ((priv->devtype == DWCMSHC_RK3588) && host->mmc->ios.timing == MMC_TIMING_MMC_HS400) { + txclk_tapnum = DLL_TXCLK_TAPNUM_90_DEGREES; + + extra = DLL_CMDOUT_SRC_CLK_NEG | + DLL_CMDOUT_EN_SRC_CLK_NEG | + DWCMSHC_EMMC_DLL_DLYENA | + DLL_CMDOUT_TAPNUM_90_DEGREES | + DLL_CMDOUT_TAPNUM_FROM_SW; + sdhci_writel(host, extra, DECMSHC_EMMC_DLL_CMDOUT); + } + extra = DWCMSHC_EMMC_DLL_DLYENA | DLL_TXCLK_TAPNUM_FROM_SW | + DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL | txclk_tapnum; sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_TXCLK); @@ -345,8 +398,26 @@ static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc return 0; } +static void dwcmshc_rk35xx_postinit(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv) +{ + /* + * Don't support highspeed bus mode with low clk speed as we + * cannot use DLL for this condition. + */ + if (host->mmc->f_max <= 52000000) { + dev_info(mmc_dev(host->mmc), "Disabling HS200/HS400, frequency too low (%d)\n", + host->mmc->f_max); + host->mmc->caps2 &= ~(MMC_CAP2_HS200 | MMC_CAP2_HS400); + host->mmc->caps &= ~(MMC_CAP_3_3V_DDR | MMC_CAP_1_8V_DDR); + } +} + static const struct of_device_id sdhci_dwcmshc_dt_ids[] = { { + .compatible = "rockchip,rk3588-dwcmshc", + .data = &sdhci_dwcmshc_rk35xx_pdata, + }, + { .compatible = "rockchip,rk3568-dwcmshc", .data = &sdhci_dwcmshc_rk35xx_pdata, }, @@ -433,6 +504,11 @@ static int dwcmshc_probe(struct platform_device *pdev) goto err_clk; } + if (of_device_is_compatible(pdev->dev.of_node, "rockchip,rk3588-dwcmshc")) + rk_priv->devtype = DWCMSHC_RK3588; + else + rk_priv->devtype = DWCMSHC_RK3568; + priv->priv = rk_priv; err = dwcmshc_rk35xx_init(host, priv); @@ -442,12 +518,21 @@ static int dwcmshc_probe(struct platform_device *pdev) host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; - err = sdhci_add_host(host); + err = sdhci_setup_host(host); if (err) goto err_clk; + if (rk_priv) + dwcmshc_rk35xx_postinit(host, priv); + + err = __sdhci_add_host(host); + if (err) + goto err_setup_host; + return 0; +err_setup_host: + sdhci_cleanup_host(host); err_clk: clk_disable_unprepare(pltfm_host->clk); clk_disable_unprepare(priv->bus_clk); |