From: Maksim Kiselev bigunclemax@gmail.com

Add support for DesignWare SDHCI host controller on Alibaba TH1520 SoC

Signed-off-by: Maksim Kiselev bigunclemax@gmail.com Tested-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- Changes for v2: - re-use phy init code - drop CONFIG_ prefix from CONFIG_MMC_SDHCI_ADMA_HELPERS - rework clock handling

drivers/mmc/Kconfig | 12 ++ drivers/mmc/Makefile | 1 + drivers/mmc/snps_sdhci.c | 444 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 457 insertions(+) create mode 100644 drivers/mmc/snps_sdhci.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 38817622fc..f4fdf15242 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -732,6 +732,18 @@ 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 868f3090ff..90e76f9076 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -71,6 +71,7 @@ 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..f5ede38c3c --- /dev/null +++ b/drivers/mmc/snps_sdhci.c @@ -0,0 +1,444 @@ +// 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) + +#define BOUNDARY_OK(addr, len) \ + (((addr) | (SZ_128M - 1)) == (((addr) + (len) - 1) | (SZ_128M - 1))) + +struct snps_sdhci_plat { + struct mmc_config cfg; + struct mmc mmc; + u16 delay_line; + u16 flags; +}; + +/* + * If DMA addr spans 128MB boundary, we split the DMA transfer into two + * so that each DMA transfer doesn't exceed the boundary. + */ +void snps_sdhci_adma_write_desc(struct sdhci_host *host, void **desc, + dma_addr_t addr, int len, bool end) +{ + int tmplen, offset; + + if (likely(!len || BOUNDARY_OK(addr, len))) { + sdhci_adma_write_desc(host, desc, addr, len, end); + return; + } + + offset = addr & (SZ_128M - 1); + tmplen = SZ_128M - offset; + sdhci_adma_write_desc(host, desc, addr, tmplen, false); + + addr += tmplen; + len -= tmplen; + sdhci_adma_write_desc(host, desc, addr, len, end); +} + +static void snps_sdhci_set_phy(struct sdhci_host *host) +{ + struct snps_sdhci_plat *plat = dev_get_plat(host->mmc->dev); + u32 rxsel = PHY_PAD_RXSEL_3V3; + u32 val; + + if (plat->flags & FLAG_IO_FIXED_1V8 || + host->mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) + rxsel = PHY_PAD_RXSEL_1V8; + + /* 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 = rxsel; + 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 = rxsel; + 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 */ + if (plat->flags & FLAG_IO_FIXED_1V8 || + host->mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { + u8 sel = FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL); + + sdhci_writeb(host, sel, PHY_DLLDL_CNFG_R); + } + + /* enable phy dll */ + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); + + 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 || + mmc->selected_mode == MMC_HS_400_ES) + 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, +#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA_HELPERS) + .adma_write_desc = snps_sdhci_adma_write_desc, +#endif +}; + +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; + + ret = clk_get_by_name(dev, "core", &clk); + if (ret) + return ret; + + ret = clk_prepare_enable(&clk); + if (ret) + return ret; + + host->max_clk = clk_get_rate(&clk); + + 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), +};