// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2024 Nuvoton Technology Corp. * * Author: Shan-Chun Hung */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sdhci-pltfm.h" #include "sdhci.h" #define MA35_SYS_MISCFCR0 0x070 #define MA35_SDHCI_MSHCCTL 0x508 #define MA35_SDHCI_MBIUCTL 0x510 #define MA35_SDHCI_CMD_CONFLICT_CHK BIT(0) #define MA35_SDHCI_INCR_MSK GENMASK(3, 0) #define MA35_SDHCI_INCR16 BIT(3) #define MA35_SDHCI_INCR8 BIT(2) struct ma35_priv { struct reset_control *rst; struct pinctrl *pinctrl; struct pinctrl_state *pins_uhs; struct pinctrl_state *pins_default; }; struct ma35_restore_data { u32 reg; u32 width; }; static const struct ma35_restore_data restore_data[] = { { SDHCI_CLOCK_CONTROL, sizeof(u32)}, { SDHCI_BLOCK_SIZE, sizeof(u32)}, { SDHCI_INT_ENABLE, sizeof(u32)}, { SDHCI_SIGNAL_ENABLE, sizeof(u32)}, { SDHCI_AUTO_CMD_STATUS, sizeof(u32)}, { SDHCI_HOST_CONTROL, sizeof(u32)}, { SDHCI_TIMEOUT_CONTROL, sizeof(u8) }, { MA35_SDHCI_MSHCCTL, sizeof(u16)}, { MA35_SDHCI_MBIUCTL, sizeof(u16)}, }; /* * If DMA addr spans 128MB boundary, we split the DMA transfer into two * so that each DMA transfer doesn't exceed the boundary. */ static void ma35_adma_write_desc(struct sdhci_host *host, void **desc, dma_addr_t addr, int len, unsigned int cmd) { int tmplen, offset; if (likely(!len || (ALIGN(addr, SZ_128M) == ALIGN(addr + len - 1, SZ_128M)))) { sdhci_adma_write_desc(host, desc, addr, len, cmd); return; } offset = addr & (SZ_128M - 1); tmplen = SZ_128M - offset; sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); addr += tmplen; len -= tmplen; sdhci_adma_write_desc(host, desc, addr, len, cmd); } static void ma35_set_clock(struct sdhci_host *host, unsigned int clock) { u32 ctl; /* * If the clock frequency exceeds MMC_HIGH_52_MAX_DTR, * disable command conflict check. */ ctl = sdhci_readw(host, MA35_SDHCI_MSHCCTL); if (clock > MMC_HIGH_52_MAX_DTR) ctl &= ~MA35_SDHCI_CMD_CONFLICT_CHK; else ctl |= MA35_SDHCI_CMD_CONFLICT_CHK; sdhci_writew(host, ctl, MA35_SDHCI_MSHCCTL); sdhci_set_clock(host, clock); } static int ma35_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) { struct sdhci_host *host = mmc_priv(mmc); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct ma35_priv *priv = sdhci_pltfm_priv(pltfm_host); switch (ios->signal_voltage) { case MMC_SIGNAL_VOLTAGE_180: if (!IS_ERR(priv->pinctrl) && !IS_ERR(priv->pins_uhs)) pinctrl_select_state(priv->pinctrl, priv->pins_uhs); break; case MMC_SIGNAL_VOLTAGE_330: if (!IS_ERR(priv->pinctrl) && !IS_ERR(priv->pins_default)) pinctrl_select_state(priv->pinctrl, priv->pins_default); break; default: dev_err(mmc_dev(host->mmc), "Unsupported signal voltage!\n"); return -EINVAL; } return sdhci_start_signal_voltage_switch(mmc, ios); } static void ma35_voltage_switch(struct sdhci_host *host) { /* Wait for 5ms after set 1.8V signal enable bit */ fsleep(5000); } static int ma35_execute_tuning(struct mmc_host *mmc, u32 opcode) { struct sdhci_host *host = mmc_priv(mmc); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct ma35_priv *priv = sdhci_pltfm_priv(pltfm_host); int idx; u32 regs[ARRAY_SIZE(restore_data)] = {}; /* * Limitations require a reset of SD/eMMC before tuning and * saving the registers before resetting, then restoring * after the reset. */ for (idx = 0; idx < ARRAY_SIZE(restore_data); idx++) { if (restore_data[idx].width == sizeof(u32)) regs[idx] = sdhci_readl(host, restore_data[idx].reg); else if (restore_data[idx].width == sizeof(u16)) regs[idx] = sdhci_readw(host, restore_data[idx].reg); else if (restore_data[idx].width == sizeof(u8)) regs[idx] = sdhci_readb(host, restore_data[idx].reg); } reset_control_assert(priv->rst); reset_control_deassert(priv->rst); for (idx = 0; idx < ARRAY_SIZE(restore_data); idx++) { if (restore_data[idx].width == sizeof(u32)) sdhci_writel(host, regs[idx], restore_data[idx].reg); else if (restore_data[idx].width == sizeof(u16)) sdhci_writew(host, regs[idx], restore_data[idx].reg); else if (restore_data[idx].width == sizeof(u8)) sdhci_writeb(host, regs[idx], restore_data[idx].reg); } return sdhci_execute_tuning(mmc, opcode); } static const struct sdhci_ops sdhci_ma35_ops = { .set_clock = ma35_set_clock, .set_bus_width = sdhci_set_bus_width, .set_uhs_signaling = sdhci_set_uhs_signaling, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .reset = sdhci_reset, .adma_write_desc = ma35_adma_write_desc, .voltage_switch = ma35_voltage_switch, }; static const struct sdhci_pltfm_data sdhci_ma35_pdata = { .ops = &sdhci_ma35_ops, .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | SDHCI_QUIRK2_BROKEN_DDR50 | SDHCI_QUIRK2_ACMD23_BROKEN, }; static int ma35_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct sdhci_pltfm_host *pltfm_host; struct sdhci_host *host; struct ma35_priv *priv; int err; u32 extra, ctl; host = sdhci_pltfm_init(pdev, &sdhci_ma35_pdata, sizeof(struct ma35_priv)); if (IS_ERR(host)) return PTR_ERR(host); /* Extra adma table cnt for cross 128M boundary handling. */ extra = DIV_ROUND_UP_ULL(dma_get_required_mask(dev), SZ_128M); extra = min(extra, SDHCI_MAX_SEGS); host->adma_table_cnt += extra; pltfm_host = sdhci_priv(host); priv = sdhci_pltfm_priv(pltfm_host); pltfm_host->clk = devm_clk_get_optional_enabled(dev, NULL); if (IS_ERR(pltfm_host->clk)) { err = dev_err_probe(dev, PTR_ERR(pltfm_host->clk), "failed to get clk\n"); goto err_sdhci; } err = mmc_of_parse(host->mmc); if (err) goto err_sdhci; priv->rst = devm_reset_control_get_exclusive(dev, NULL); if (IS_ERR(priv->rst)) { err = dev_err_probe(dev, PTR_ERR(priv->rst), "failed to get reset control\n"); goto err_sdhci; } sdhci_get_of_property(pdev); priv->pinctrl = devm_pinctrl_get(dev); if (!IS_ERR(priv->pinctrl)) { priv->pins_default = pinctrl_lookup_state(priv->pinctrl, "default"); priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl, "state_uhs"); pinctrl_select_state(priv->pinctrl, priv->pins_default); } if (!(host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)) { struct regmap *regmap; u32 reg; regmap = syscon_regmap_lookup_by_phandle(dev_of_node(dev), "nuvoton,sys"); if (!IS_ERR(regmap)) { /* Enable SDHCI voltage stable for 1.8V */ regmap_read(regmap, MA35_SYS_MISCFCR0, ®); reg |= BIT(17); regmap_write(regmap, MA35_SYS_MISCFCR0, reg); } host->mmc_host_ops.start_signal_voltage_switch = ma35_start_signal_voltage_switch; } host->mmc_host_ops.execute_tuning = ma35_execute_tuning; err = sdhci_add_host(host); if (err) goto err_sdhci; /* * Split data into chunks of 16 or 8 bytes for transmission. * Each chunk transfer is guaranteed to be uninterrupted on the bus. * This likely corresponds to the AHB bus DMA burst size. */ ctl = sdhci_readw(host, MA35_SDHCI_MBIUCTL); ctl &= ~MA35_SDHCI_INCR_MSK; ctl |= MA35_SDHCI_INCR16 | MA35_SDHCI_INCR8; sdhci_writew(host, ctl, MA35_SDHCI_MBIUCTL); return 0; err_sdhci: sdhci_pltfm_free(pdev); return err; } static void ma35_disable_card_clk(struct sdhci_host *host) { u16 ctrl; ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL); if (ctrl & SDHCI_CLOCK_CARD_EN) { ctrl &= ~SDHCI_CLOCK_CARD_EN; sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL); } } static void ma35_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); sdhci_remove_host(host, 0); ma35_disable_card_clk(host); sdhci_pltfm_free(pdev); } static const struct of_device_id sdhci_ma35_dt_ids[] = { { .compatible = "nuvoton,ma35d1-sdhci" }, {} }; static struct platform_driver sdhci_ma35_driver = { .driver = { .name = "sdhci-ma35", .of_match_table = sdhci_ma35_dt_ids, }, .probe = ma35_probe, .remove = ma35_remove, }; module_platform_driver(sdhci_ma35_driver); MODULE_DESCRIPTION("SDHCI platform driver for Nuvoton MA35"); MODULE_AUTHOR("Shan-Chun Hung "); MODULE_LICENSE("GPL");