drivers/mmc/sdhci-cadence.c

   1 /*
   2  * Copyright (C) 2016 Socionext Inc.
   3  *   Author: Masahiro Yamada <[email protected]>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <linux/io.h>
  11 #include <linux/iopoll.h>
  12 #include <linux/sizes.h>
  13 #include <libfdt.h>
  14 #include <mmc.h>
  15 #include <sdhci.h>
  16
  17 /* HRS - Host Register Set (specific to Cadence) */
  18 #define SDHCI_CDNS_HRS04                0x10            /* PHY access port */
  19 #define   SDHCI_CDNS_HRS04_ACK                  BIT(26)
  20 #define   SDHCI_CDNS_HRS04_RD                   BIT(25)
  21 #define   SDHCI_CDNS_HRS04_WR                   BIT(24)
  22 #define   SDHCI_CDNS_HRS04_RDATA_SHIFT          16
  23 #define   SDHCI_CDNS_HRS04_WDATA_SHIFT          8
  24 #define   SDHCI_CDNS_HRS04_ADDR_SHIFT           0
  25
  26 /* SRS - Slot Register Set (SDHCI-compatible) */
  27 #define SDHCI_CDNS_SRS_BASE             0x200
  28
  29 /* PHY */
  30 #define SDHCI_CDNS_PHY_DLY_SD_HS        0x00
  31 #define SDHCI_CDNS_PHY_DLY_SD_DEFAULT   0x01
  32 #define SDHCI_CDNS_PHY_DLY_UHS_SDR12    0x02
  33 #define SDHCI_CDNS_PHY_DLY_UHS_SDR25    0x03
  34 #define SDHCI_CDNS_PHY_DLY_UHS_SDR50    0x04
  35 #define SDHCI_CDNS_PHY_DLY_UHS_DDR50    0x05
  36 #define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY  0x06
  37 #define SDHCI_CDNS_PHY_DLY_EMMC_SDR     0x07
  38 #define SDHCI_CDNS_PHY_DLY_EMMC_DDR     0x08
  39 #define SDHCI_CDNS_PHY_DLY_SDCLK        0x0b
  40 #define SDHCI_CDNS_PHY_DLY_HSMMC        0x0c
  41 #define SDHCI_CDNS_PHY_DLY_STROBE       0x0d
  42
  43 struct sdhci_cdns_plat {
  44         struct mmc_config cfg;
  45         struct mmc mmc;
  46         void __iomem *hrs_addr;
  47 };
  48
  49 struct sdhci_cdns_phy_cfg {
  50         const char *property;
  51         u8 addr;
  52 };
  53
  54 static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
  55         { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, },
  56         { "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, },
  57         { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, },
  58         { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, },
  59         { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, },
  60         { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, },
  61         { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, },
  62         { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, },
  63         { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, },
  64         { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, },
  65         { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
  66 };
  67
  68 static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat,
  69                                     u8 addr, u8 data)
  70 {
  71         void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS04;
  72         u32 tmp;
  73         int ret;
  74
  75         tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) |
  76               (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT);
  77         writel(tmp, reg);
  78
  79         tmp |= SDHCI_CDNS_HRS04_WR;
  80         writel(tmp, reg);
  81
  82         ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 10);
  83         if (ret)
  84                 return ret;
  85
  86         tmp &= ~SDHCI_CDNS_HRS04_WR;
  87         writel(tmp, reg);
  88
  89         return 0;
  90 }
  91
  92 static int sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat,
  93                                 const void *fdt, int nodeoffset)
  94 {
  95         const u32 *prop;
  96         int ret, i;
  97
  98         for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) {
  99                 prop = fdt_getprop(fdt, nodeoffset,
 100                                    sdhci_cdns_phy_cfgs[i].property, NULL);
 101                 if (!prop)
 102                         continue;
 103
 104                 ret = sdhci_cdns_write_phy_reg(plat,
 105                                                sdhci_cdns_phy_cfgs[i].addr,
 106                                                fdt32_to_cpu(*prop));
 107                 if (ret)
 108                         return ret;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static int sdhci_cdns_bind(struct udevice *dev)
 115 {
 116         struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
 117
 118         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 119 }
 120
 121 static int sdhci_cdns_probe(struct udevice *dev)
 122 {
 123         DECLARE_GLOBAL_DATA_PTR;
 124         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 125         struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
 126         struct sdhci_host *host = dev_get_priv(dev);
 127         fdt_addr_t base;
 128         int ret;
 129
 130         base = devfdt_get_addr(dev);
 131         if (base == FDT_ADDR_T_NONE)
 132                 return -EINVAL;
 133
 134         plat->hrs_addr = devm_ioremap(dev, base, SZ_1K);
 135         if (!plat->hrs_addr)
 136                 return -ENOMEM;
 137
 138         host->name = dev->name;
 139         host->ioaddr = plat->hrs_addr + SDHCI_CDNS_SRS_BASE;
 140         host->quirks |= SDHCI_QUIRK_WAIT_SEND_CMD;
 141
 142         ret = sdhci_cdns_phy_init(plat, gd->fdt_blob, dev->of_offset);
 143         if (ret)
 144                 return ret;
 145
 146         ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
 147         if (ret)
 148                 return ret;
 149
 150         upriv->mmc = &plat->mmc;
 151         host->mmc = &plat->mmc;
 152         host->mmc->priv = host;
 153
 154         return sdhci_probe(dev);
 155 }
 156
 157 static const struct udevice_id sdhci_cdns_match[] = {
 158         { .compatible = "socionext,uniphier-sd4hc" },
 159         { .compatible = "cdns,sd4hc" },
 160         { /* sentinel */ }
 161 };
 162
 163 U_BOOT_DRIVER(sdhci_cdns) = {
 164         .name = "sdhci-cdns",
 165         .id = UCLASS_MMC,
 166         .of_match = sdhci_cdns_match,
 167         .bind = sdhci_cdns_bind,
 168         .probe = sdhci_cdns_probe,
 169         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 170         .platdata_auto_alloc_size = sizeof(struct sdhci_cdns_plat),
 171         .ops = &sdhci_ops,
 172 };