[RFC PATCH v1 1/1] mmc: snps_sdhci: Add sdhci driver support for TH1520 SoC

Maksim Kiselev
2024-03-30T18:00:19Z

Add support for DesignWare SDHCI host controller on Alibaba TH1520 SoC

Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com>
---
drivers/mmc/Kconfig | 12 +
drivers/mmc/Makefile | 1 +
drivers/mmc/snps_sdhci.c | 464 +++++++++++++++++++++++++++++++++++++++
3 files changed, 477 insertions(+)
create mode 100644 drivers/mmc/snps_sdhci.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index cef05790dd..6936fa0928 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -671,6 +671,18 @@ config MMC_SDHCI_S5P

If unsure, say N.

+config MMC_SDHCI_SNPS
+ bool "Synopsys DesignWare SDHCI controller"
+ depends on MMC_SDHCI
+ depends on DM_MMC
+ help
+ Support for DesignWare SDHCI host controller on Alibaba TH1520 SoC.
+ This is a highly configurable and programmable, high performance
+ Mobile Storage Host Controller (MSHC) with AXI as the bus interface
+ for data transfer.
+
+ If unsure, say N.
+
config MMC_SDHCI_STI
bool "SDHCI support for STMicroelectronics SoC"
depends on MMC_SDHCI && OF_CONTROL
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index e9cf1fcc64..49fc1a5d36 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_MMC_SDHCI_NPCM) += npcm_sdhci.o
obj-$(CONFIG_MMC_SDHCI_PIC32) += pic32_sdhci.o
obj-$(CONFIG_MMC_SDHCI_ROCKCHIP) += rockchip_sdhci.o
obj-$(CONFIG_MMC_SDHCI_S5P) += s5p_sdhci.o
+obj-$(CONFIG_MMC_SDHCI_SNPS) += snps_sdhci.o
obj-$(CONFIG_MMC_SDHCI_STI) += sti_sdhci.o
obj-$(CONFIG_MMC_SDHCI_TANGIER) += tangier_sdhci.o
obj-$(CONFIG_MMC_SDHCI_TEGRA) += tegra_mmc.o
diff --git a/drivers/mmc/snps_sdhci.c b/drivers/mmc/snps_sdhci.c
new file mode 100644
index 0000000000..3302f22cf8
--- /dev/null
+++ b/drivers/mmc/snps_sdhci.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Maksim Kiselev <bigunclemax@gmail.com>
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <linux/bitfield.h>
+#include <sdhci.h>
+
+/* DWCMSHC specific Mode Select value */
+#define DWCMSHC_CTRL_HS400 0x7
+/* 400KHz is max freq for card ID etc. Use that as min */
+#define EMMC_MIN_FREQ 400000
+#define SDHCI_TUNING_LOOP_COUNT 128
+
+/* PHY register area pointer */
+#define DWC_MSHC_PTR_PHY_R 0x300
+
+/* PHY general configuration */
+#define PHY_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x00)
+#define PHY_CNFG_RSTN_DEASSERT 0x1 /* Deassert PHY reset */
+#define PHY_CNFG_PAD_SP_MASK GENMASK(19, 16) /* bits [19:16] */
+#define PHY_CNFG_PAD_SP 0x0c /* PMOS TX drive strength */
+#define PHY_CNFG_PAD_SN_MASK GENMASK(23, 20) /* bits [23:20] */
+#define PHY_CNFG_PAD_SN 0x0c /* NMOS TX drive strength */
+
+/* PHY command/response pad settings */
+#define PHY_CMDPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x04)
+
+/* PHY data pad settings */
+#define PHY_DATAPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x06)
+
+/* PHY clock pad settings */
+#define PHY_CLKPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x08)
+
+/* PHY strobe pad settings */
+#define PHY_STBPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0a)
+
+/* PHY reset pad settings */
+#define PHY_RSTNPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0c)
+
+/* Bitfields are common for all pad settings */
+#define PHY_PAD_RXSEL_1V8 0x1 /* Receiver type select for 1.8V */
+#define PHY_PAD_RXSEL_3V3 0x2 /* Receiver type select for 3.3V */
+
+#define PHY_PAD_WEAKPULL_MASK GENMASK(4, 3) /* bits [4:3] */
+#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull up enabled */
+#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */
+
+#define PHY_PAD_TXSLEW_CTRL_P_MASK GENMASK(8, 5) /* bits [8:5] */
+#define PHY_PAD_TXSLEW_CTRL_P 0x3 /* Slew control for P-Type pad TX */
+#define PHY_PAD_TXSLEW_CTRL_N_MASK GENMASK(12, 9) /* bits [12:9] */
+#define PHY_PAD_TXSLEW_CTRL_N 0x3 /* Slew control for N-Type pad TX */
+
+/* PHY CLK delay line settings */
+#define PHY_SDCLKDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x1d)
+#define PHY_SDCLKDL_CNFG_UPDATE BIT(4) /* set before writing to SDCLKDL_DC */
+
+/* PHY CLK delay line delay code */
+#define PHY_SDCLKDL_DC_R (DWC_MSHC_PTR_PHY_R + 0x1e)
+#define PHY_SDCLKDL_DC_INITIAL 0x40 /* initial delay code */
+#define PHY_SDCLKDL_DC_DEFAULT 0x32 /* default delay code */
+#define PHY_SDCLKDL_DC_HS400 0x18 /* delay code for HS400 mode */
+
+/* PHY drift_cclk_rx delay line configuration setting */
+#define PHY_ATDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x21)
+#define PHY_ATDL_CNFG_INPSEL_MASK GENMASK(3, 2) /* bits [3:2] */
+#define PHY_ATDL_CNFG_INPSEL 0x3 /* delay line input source */
+
+/* PHY DLL control settings */
+#define PHY_DLL_CTRL_R (DWC_MSHC_PTR_PHY_R + 0x24)
+#define PHY_DLL_CTRL_DISABLE 0x0 /* PHY DLL is enabled */
+#define PHY_DLL_CTRL_ENABLE 0x1 /* PHY DLL is disabled */
+
+/* PHY DLL configuration register 1 */
+#define PHY_DLL_CNFG1_R (DWC_MSHC_PTR_PHY_R + 0x25)
+#define PHY_DLL_CNFG1_SLVDLY_MASK GENMASK(5, 4) /* bits [5:4] */
+#define PHY_DLL_CNFG1_SLVDLY 0x2 /* DLL slave update delay input */
+#define PHY_DLL_CNFG1_WAITCYCLE 0x5 /* DLL wait cycle input */
+
+/* PHY DLL configuration register 2 */
+#define PHY_DLL_CNFG2_R (DWC_MSHC_PTR_PHY_R + 0x26)
+#define PHY_DLL_CNFG2_JUMPSTEP 0xa /* DLL jump step input */
+
+/* PHY DLL master and slave delay line configuration settings */
+#define PHY_DLLDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x28)
+#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK GENMASK(6, 5) /* bits [6:5] */
+#define PHY_DLLDL_CNFG_SLV_INPSEL 0x3 /* clock source select for slave DL */
+
+/* Vendor specific Registers */
+#define P_VENDOR_SPECIFIC_AREA 0x500
+
+#define DWCMSHC_EMMC_CONTROL 0x2c
+#define DWCMSHC_CARD_IS_EMMC BIT(0)
+#define DWCMSHC_ENHANCED_STROBE BIT(8)
+#define DWCMSHC_EMMC_ATCTRL 0x40
+/* Tuning and auto-tuning fields in AT_CTRL_R control register */
+#define AT_CTRL_AT_EN BIT(0) /* autotuning is enabled */
+#define AT_CTRL_CI_SEL BIT(1) /* interval to drive center phase select */
+#define AT_CTRL_SWIN_TH_EN BIT(2) /* sampling window threshold enable */
+#define AT_CTRL_RPT_TUNE_ERR BIT(3) /* enable reporting framing errors */
+#define AT_CTRL_SW_TUNE_EN BIT(4) /* enable software managed tuning */
+#define AT_CTRL_WIN_EDGE_SEL_MASK GENMASK(11, 8) /* bits [11:8] */
+#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */
+#define AT_CTRL_TUNE_CLK_STOP_EN BIT(16) /* clocks stopped during phase code change */
+#define AT_CTRL_PRE_CHANGE_DLY_MASK GENMASK(18, 17) /* bits [18:17] */
+#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */
+#define AT_CTRL_POST_CHANGE_DLY_MASK GENMASK(20, 19) /* bits [20:19] */
+#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */
+#define AT_CTRL_SWIN_TH_VAL_MASK GENMASK(31, 24) /* bits [31:24] */
+#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */
+
+#define FLAG_IO_FIXED_1V8 BIT(0)
+
+struct snps_sdhci_plat {
+ struct mmc_config cfg;
+ struct mmc mmc;
+ u16 delay_line;
+ u16 flags;
+};
+
+static void sdhci_phy_1_8v_init(struct sdhci_host *host)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(host->mmc->dev);
+ u32 val;
+
+ /* deassert phy reset & set tx drive strength */
+ val = PHY_CNFG_RSTN_DEASSERT;
+ val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
+ val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
+ sdhci_writel(host, val, PHY_CNFG_R);
+
+ /* disable delay line */
+ sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
+
+ /* set delay line */
+ sdhci_writeb(host, plat->delay_line, PHY_SDCLKDL_DC_R);
+ sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
+
+ /* enable delay lane */
+ val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+ val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
+ sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+
+ /* configure phy pads */
+ val = PHY_PAD_RXSEL_1V8;
+ val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
+ sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
+ sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
+
+ val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
+
+ val = PHY_PAD_RXSEL_1V8;
+ val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+
+ /* enable data strobe mode */
+ sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
+ PHY_DLLDL_CNFG_R);
+
+ /* enable phy dll */
+ sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
+}
+
+static void sdhci_phy_3_3v_init(struct sdhci_host *host)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(host->mmc->dev);
+ u32 val;
+
+ /* deassert phy reset & set tx drive strength */
+ val = PHY_CNFG_RSTN_DEASSERT;
+ val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
+ val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
+ sdhci_writel(host, val, PHY_CNFG_R);
+
+ /* disable delay line */
+ sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
+
+ /* set delay line */
+ sdhci_writeb(host, plat->delay_line, PHY_SDCLKDL_DC_R);
+ sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
+
+ /* enable delay lane */
+ val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+ val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
+ sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+
+ /* configure phy pads */
+ val = PHY_PAD_RXSEL_3V3;
+ val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
+ sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
+ sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
+
+ val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
+
+ val = PHY_PAD_RXSEL_3V3;
+ val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+ val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+ sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+
+ /* enable phy dll */
+ sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
+}
+
+static void snps_sdhci_set_phy(struct sdhci_host *host)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(host->mmc->dev);
+ struct mmc *mmc = host->mmc;
+
+ /* Before power on, set PHY configs */
+ if ((plat->flags & FLAG_IO_FIXED_1V8) ||
+ mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
+ sdhci_phy_1_8v_init(host);
+ else
+ sdhci_phy_3_3v_init(host);
+
+ sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
+ PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
+}
+
+static int snps_sdhci_set_ios_post(struct sdhci_host *host)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(host->mmc->dev);
+ struct mmc *mmc = host->mmc;
+ u32 reg;
+
+ reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ reg &= ~SDHCI_CTRL_UHS_MASK;
+
+ switch (mmc->selected_mode) {
+ case UHS_SDR50:
+ case MMC_HS_52:
+ reg |= SDHCI_CTRL_UHS_SDR50;
+ break;
+ case UHS_DDR50:
+ case MMC_DDR_52:
+ reg |= SDHCI_CTRL_UHS_DDR50;
+ break;
+ case UHS_SDR104:
+ case MMC_HS_200:
+ reg |= SDHCI_CTRL_UHS_SDR104;
+ break;
+ case MMC_HS_400:
+ case MMC_HS_400_ES:
+ reg |= DWCMSHC_CTRL_HS400;
+ break;
+ default:
+ reg |= SDHCI_CTRL_UHS_SDR12;
+ }
+
+ if ((plat->flags & FLAG_IO_FIXED_1V8) ||
+ mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
+ reg |= SDHCI_CTRL_VDD_180;
+ else
+ reg &= ~SDHCI_CTRL_VDD_180;
+
+ sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
+
+ reg = sdhci_readw(host, P_VENDOR_SPECIFIC_AREA + DWCMSHC_EMMC_CONTROL);
+
+ if (IS_MMC(mmc))
+ reg |= DWCMSHC_CARD_IS_EMMC;
+ else
+ reg &= ~DWCMSHC_CARD_IS_EMMC;
+
+ if (mmc->selected_mode == MMC_HS_400_ES)
+ reg |= DWCMSHC_ENHANCED_STROBE;
+ else
+ reg &= ~DWCMSHC_ENHANCED_STROBE;
+
+ sdhci_writeb(host, reg, P_VENDOR_SPECIFIC_AREA + DWCMSHC_EMMC_CONTROL);
+
+ if (mmc->selected_mode == MMC_HS_400)
+ plat->delay_line = PHY_SDCLKDL_DC_HS400;
+ else
+ sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
+
+ snps_sdhci_set_phy(host);
+
+ return 0;
+}
+
+static int snps_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
+{
+ struct sdhci_host *host = dev_get_priv(mmc->dev);
+ char tuning_loop_counter = SDHCI_TUNING_LOOP_COUNT;
+ struct mmc_cmd cmd;
+ u32 ctrl, blk_size, val;
+ int ret;
+
+ sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
+ PHY_ATDL_CNFG_R);
+ val = sdhci_readl(host, P_VENDOR_SPECIFIC_AREA + DWCMSHC_EMMC_ATCTRL);
+
+ /*
+ * configure tuning settings:
+ * - center phase select code driven in block gap interval
+ * - disable reporting of framing errors
+ * - disable software managed tuning
+ * - disable user selection of sampling window edges,
+ * instead tuning calculated edges are used
+ */
+ val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
+ FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
+
+ /*
+ * configure tuning settings:
+ * - enable auto-tuning
+ * - enable sampling window threshold
+ * - stop clocks during phase code change
+ * - set max latency in cycles between tx and rx clocks
+ * - set max latency in cycles to switch output phase
+ * - set max sampling window threshold value
+ */
+ val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
+ val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
+ val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
+ val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
+
+ sdhci_writel(host, val, P_VENDOR_SPECIFIC_AREA + DWCMSHC_EMMC_ATCTRL);
+ val = sdhci_readl(host, P_VENDOR_SPECIFIC_AREA + DWCMSHC_EMMC_ATCTRL);
+
+ /* perform tuning */
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ ctrl |= SDHCI_CTRL_EXEC_TUNING;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ blk_size = SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 64);
+ if (opcode == MMC_CMD_SEND_TUNING_BLOCK_HS200 && mmc->bus_width == 8)
+ blk_size = SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 128);
+ sdhci_writew(host, blk_size, SDHCI_BLOCK_SIZE);
+ sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
+
+ cmd.cmdidx = opcode;
+ cmd.resp_type = MMC_RSP_R1;
+ cmd.cmdarg = 0;
+
+ do {
+ ret = mmc_send_cmd(mmc, &cmd, NULL);
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (ret || tuning_loop_counter-- == 0)
+ break;
+
+ } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
+
+ if (ret || tuning_loop_counter < 0 || !(ctrl & SDHCI_CTRL_TUNED_CLK)) {
+ if (!ret)
+ ret = -EIO;
+ printf("%s: Tuning failed: %d\n", __func__, ret);
+
+ ctrl &= ~SDHCI_CTRL_TUNED_CLK;
+ ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ }
+
+ return ret;
+}
+
+static int snps_sdhci_set_enhanced_strobe(struct sdhci_host *host)
+{
+ return 0;
+}
+
+static const struct sdhci_ops snps_sdhci_ops = {
+ .set_ios_post = snps_sdhci_set_ios_post,
+ .platform_execute_tuning = snps_sdhci_execute_tuning,
+ .set_enhanced_strobe = snps_sdhci_set_enhanced_strobe,
+};
+
+static int snps_sdhci_probe(struct udevice *dev)
+{
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct snps_sdhci_plat *plat = dev_get_plat(dev);
+ struct mmc_config *cfg = &plat->cfg;
+ struct sdhci_host *host = dev_get_priv(dev);
+ struct clk clk;
+ int ret;
+
+ plat->delay_line = PHY_SDCLKDL_DC_DEFAULT;
+
+ host->max_clk = cfg->f_max;
+ ret = clk_get_by_index(dev, 0, &clk);
+ if (!ret) {
+ ret = clk_set_rate(&clk, host->max_clk);
+ if (IS_ERR_VALUE(ret))
+ printf("%s clk set rate fail!\n", __func__);
+ } else {
+ printf("%s fail to get clk\n", __func__);
+ }
+
+ host->ops = &snps_sdhci_ops;
+
+ host->mmc = &plat->mmc;
+ host->mmc->priv = host;
+ host->mmc->dev = dev;
+ upriv->mmc = host->mmc;
+
+ ret = sdhci_setup_cfg(cfg, host, cfg->f_max, EMMC_MIN_FREQ);
+ if (ret)
+ return ret;
+
+ if ((dev_read_bool(dev, "mmc-ddr-1_8v")) ||
+ (dev_read_bool(dev, "mmc-hs200-1_8v")) ||
+ (dev_read_bool(dev, "mmc-hs400-1_8v")))
+ plat->flags |= FLAG_IO_FIXED_1V8;
+ else
+ plat->flags &= ~FLAG_IO_FIXED_1V8;
+
+ return sdhci_probe(dev);
+}
+
+static int snps_sdhci_of_to_plat(struct udevice *dev)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(dev);
+ struct mmc_config *cfg = &plat->cfg;
+ struct sdhci_host *host = dev_get_priv(dev);
+ int ret;
+
+ host->name = dev->name;
+ host->ioaddr = dev_read_addr_ptr(dev);
+
+ ret = mmc_of_parse(dev, cfg);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int snps_sdhci_bind(struct udevice *dev)
+{
+ struct snps_sdhci_plat *plat = dev_get_plat(dev);
+
+ return sdhci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id snps_sdhci_ids[] = {
+ { .compatible = "thead,th1520-dwcmshc" }
+};
+
+U_BOOT_DRIVER(snps_sdhci_drv) = {
+ .name = "snps_sdhci",
+ .id = UCLASS_MMC,
+ .of_match = snps_sdhci_ids,
+ .of_to_plat = snps_sdhci_of_to_plat,
+ .ops = &sdhci_ops,
+ .bind = snps_sdhci_bind,
+ .probe = snps_sdhci_probe,
+ .priv_auto = sizeof(struct sdhci_host),
+ .plat_auto = sizeof(struct snps_sdhci_plat),
+};
--
2.40.1