// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2012 SAMSUNG Electronics * Jaehoon Chung */ #include #include #include #include #include #include #include #include #include #include #include #define DWMMC_MAX_CH_NUM 4 #define DWMMC_MAX_FREQ 52000000 #define DWMMC_MIN_FREQ 400000 #define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001 #define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001 #ifdef CONFIG_DM_MMC #include DECLARE_GLOBAL_DATA_PTR; struct exynos_mmc_plat { struct mmc_config cfg; struct mmc mmc; }; #endif /* Exynos implmentation specific drver private data */ struct dwmci_exynos_priv_data { #ifdef CONFIG_DM_MMC struct dwmci_host host; #endif u32 sdr_timing; }; /* * Function used as callback function to initialise the * CLKSEL register for every mmc channel. */ static void exynos_dwmci_clksel(struct dwmci_host *host) { #ifdef CONFIG_DM_MMC struct dwmci_exynos_priv_data *priv = container_of(host, struct dwmci_exynos_priv_data, host); #else struct dwmci_exynos_priv_data *priv = host->priv; #endif dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing); } unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq) { unsigned long sclk; int8_t clk_div; /* * Since SDCLKIN is divided inside controller by the DIVRATIO * value set in the CLKSEL register, we need to use the same output * clock value to calculate the CLKDIV value. * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1) */ clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT) & DWMCI_DIVRATIO_MASK) + 1; sclk = get_mmc_clk(host->dev_index); /* * Assume to know divider value. * When clock unit is broken, need to set "host->div" */ return sclk / clk_div / (host->div + 1); } static void exynos_dwmci_board_init(struct dwmci_host *host) { struct dwmci_exynos_priv_data *priv = host->priv; if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) { dwmci_writel(host, EMMCP_MPSBEGIN0, 0); dwmci_writel(host, EMMCP_SEND0, 0); dwmci_writel(host, EMMCP_CTRL0, MPSCTRL_SECURE_READ_BIT | MPSCTRL_SECURE_WRITE_BIT | MPSCTRL_NON_SECURE_READ_BIT | MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID); } /* Set to timing value at initial time */ if (priv->sdr_timing) exynos_dwmci_clksel(host); } static int exynos_dwmci_core_init(struct dwmci_host *host) { unsigned int div; unsigned long freq, sclk; if (host->bus_hz) freq = host->bus_hz; else freq = DWMMC_MAX_FREQ; /* request mmc clock vlaue of 52MHz. */ sclk = get_mmc_clk(host->dev_index); div = DIV_ROUND_UP(sclk, freq); /* set the clock divisor for mmc */ set_mmc_clk(host->dev_index, div); host->name = "EXYNOS DWMMC"; #ifdef CONFIG_EXYNOS5420 host->quirks = DWMCI_QUIRK_DISABLE_SMU; #endif host->board_init = exynos_dwmci_board_init; host->caps = MMC_MODE_DDR_52MHz; host->clksel = exynos_dwmci_clksel; host->get_mmc_clk = exynos_dwmci_get_clk; #ifndef CONFIG_DM_MMC /* Add the mmc channel to be registered with mmc core */ if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) { printf("DWMMC%d registration failed\n", host->dev_index); return -1; } #endif return 0; } static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM]; static int do_dwmci_init(struct dwmci_host *host) { int flag, err; flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE; err = exynos_pinmux_config(host->dev_id, flag); if (err) { printf("DWMMC%d not configure\n", host->dev_index); return err; } return exynos_dwmci_core_init(host); } static int exynos_dwmci_get_config(const void *blob, int node, struct dwmci_host *host, struct dwmci_exynos_priv_data *priv) { int err = 0; u32 base, timing[3]; /* Extract device id for each mmc channel */ host->dev_id = pinmux_decode_periph_id(blob, node); host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id); if (host->dev_index == host->dev_id) host->dev_index = host->dev_id - PERIPH_ID_SDMMC0; if (host->dev_index > 4) { printf("DWMMC%d: Can't get the dev index\n", host->dev_index); return -EINVAL; } /* Get the bus width from the device node (Default is 4bit buswidth) */ host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4); /* Set the base address from the device node */ base = fdtdec_get_addr(blob, node, "reg"); if (!base) { printf("DWMMC%d: Can't get base address\n", host->dev_index); return -EINVAL; } host->ioaddr = (void *)base; /* Extract the timing info from the node */ err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3); if (err) { printf("DWMMC%d: Can't get sdr-timings for devider\n", host->dev_index); return -EINVAL; } priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) | DWMCI_SET_DRV_CLK(timing[1]) | DWMCI_SET_DIV_RATIO(timing[2])); /* sdr_timing didn't assigned anything, use the default value */ if (!priv->sdr_timing) { if (host->dev_index == 0) priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL; else if (host->dev_index == 2) priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL; } host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0); host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0); host->div = fdtdec_get_int(blob, node, "div", 0); return 0; } static int exynos_dwmci_process_node(const void *blob, int node_list[], int count) { struct dwmci_exynos_priv_data *priv; struct dwmci_host *host; int i, node, err; for (i = 0; i < count; i++) { node = node_list[i]; if (node <= 0) continue; host = &dwmci_host[i]; priv = malloc(sizeof(struct dwmci_exynos_priv_data)); if (!priv) { pr_err("dwmci_exynos_priv_data malloc fail!\n"); return -ENOMEM; } err = exynos_dwmci_get_config(blob, node, host, priv); if (err) { printf("%s: failed to decode dev %d\n", __func__, i); free(priv); return err; } host->priv = priv; do_dwmci_init(host); } return 0; } int exynos_dwmmc_init(const void *blob) { int node_list[DWMMC_MAX_CH_NUM]; int boot_dev_node; int err = 0, count; count = fdtdec_find_aliases_for_id(blob, "mmc", COMPAT_SAMSUNG_EXYNOS_DWMMC, node_list, DWMMC_MAX_CH_NUM); /* For DWMMC always set boot device as mmc 0 */ if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) { boot_dev_node = node_list[2]; node_list[2] = node_list[0]; node_list[0] = boot_dev_node; } err = exynos_dwmci_process_node(blob, node_list, count); return err; } #ifdef CONFIG_DM_MMC static int exynos_dwmmc_probe(struct udevice *dev) { struct exynos_mmc_plat *plat = dev_get_platdata(dev); struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); struct dwmci_exynos_priv_data *priv = dev_get_priv(dev); struct dwmci_host *host = &priv->host; int err; err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host, priv); if (err) return err; err = do_dwmci_init(host); if (err) return err; dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ); host->mmc = &plat->mmc; host->mmc->priv = &priv->host; host->priv = dev; upriv->mmc = host->mmc; return dwmci_probe(dev); } static int exynos_dwmmc_bind(struct udevice *dev) { struct exynos_mmc_plat *plat = dev_get_platdata(dev); return dwmci_bind(dev, &plat->mmc, &plat->cfg); } static const struct udevice_id exynos_dwmmc_ids[] = { { .compatible = "samsung,exynos4412-dw-mshc" }, { .compatible = "samsung,exynos-dwmmc" }, { } }; U_BOOT_DRIVER(exynos_dwmmc_drv) = { .name = "exynos_dwmmc", .id = UCLASS_MMC, .of_match = exynos_dwmmc_ids, .bind = exynos_dwmmc_bind, .ops = &dm_dwmci_ops, .probe = exynos_dwmmc_probe, .priv_auto_alloc_size = sizeof(struct dwmci_exynos_priv_data), .platdata_auto_alloc_size = sizeof(struct exynos_mmc_plat), }; #endif