drivers/mmc/sdhci-cadence.c

   1 /*
   2  * Copyright (C) 2016 Socionext Inc.
   3  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <linux/io.h>
  10 #include <linux/sizes.h>
  11 #include <dm/device.h>
  12 #include <mmc.h>
  13 #include <sdhci.h>
  14
  15 /* HRS - Host Register Set (specific to Cadence) */
  16 #define SDHCI_CDNS_HRS04                0x10            /* PHY access port */
  17 #define   SDHCI_CDNS_HRS04_ACK                  BIT(26)
  18 #define   SDHCI_CDNS_HRS04_RD                   BIT(25)
  19 #define   SDHCI_CDNS_HRS04_WR                   BIT(24)
  20 #define   SDHCI_CDNS_HRS04_RDATA_SHIFT          12
  21 #define   SDHCI_CDNS_HRS04_WDATA_SHIFT          8
  22 #define   SDHCI_CDNS_HRS04_ADDR_SHIFT           0
  23
  24 /* SRS - Slot Register Set (SDHCI-compatible) */
  25 #define SDHCI_CDNS_SRS_BASE             0x200
  26
  27 /* PHY */
  28 #define SDHCI_CDNS_PHY_DLY_SD_HS        0x00
  29 #define SDHCI_CDNS_PHY_DLY_SD_DEFAULT   0x01
  30 #define SDHCI_CDNS_PHY_DLY_UHS_SDR12    0x02
  31 #define SDHCI_CDNS_PHY_DLY_UHS_SDR25    0x03
  32 #define SDHCI_CDNS_PHY_DLY_UHS_SDR50    0x04
  33 #define SDHCI_CDNS_PHY_DLY_UHS_DDR50    0x05
  34 #define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY  0x06
  35 #define SDHCI_CDNS_PHY_DLY_EMMC_SDR     0x07
  36 #define SDHCI_CDNS_PHY_DLY_EMMC_DDR     0x08
  37
  38 struct sdhci_cdns_plat {
  39         struct mmc_config cfg;
  40         struct mmc mmc;
  41         void __iomem *hrs_addr;
  42 };
  43
  44 static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat,
  45                                      u8 addr, u8 data)
  46 {
  47         void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS04;
  48         u32 tmp;
  49
  50         tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) |
  51               (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT);
  52         writel(tmp, reg);
  53
  54         tmp |= SDHCI_CDNS_HRS04_WR;
  55         writel(tmp, reg);
  56
  57         tmp &= ~SDHCI_CDNS_HRS04_WR;
  58         writel(tmp, reg);
  59 }
  60
  61 static void sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat)
  62 {
  63         sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_SD_HS, 4);
  64         sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_SD_DEFAULT, 4);
  65         sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_LEGACY, 9);
  66         sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_SDR, 2);
  67         sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_DDR, 3);
  68 }
  69
  70 static int sdhci_cdns_bind(struct udevice *dev)
  71 {
  72         struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
  73
  74         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
  75 }
  76
  77 static int sdhci_cdns_probe(struct udevice *dev)
  78 {
  79         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  80         struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
  81         struct sdhci_host *host = dev_get_priv(dev);
  82         fdt_addr_t base;
  83         int ret;
  84
  85         base = dev_get_addr(dev);
  86         if (base == FDT_ADDR_T_NONE)
  87                 return -EINVAL;
  88
  89         plat->hrs_addr = devm_ioremap(dev, base, SZ_1K);
  90         if (!plat->hrs_addr)
  91                 return -ENOMEM;
  92
  93         host->name = dev->name;
  94         host->ioaddr = plat->hrs_addr + SDHCI_CDNS_SRS_BASE;
  95         host->quirks |= SDHCI_QUIRK_WAIT_SEND_CMD;
  96
  97         sdhci_cdns_phy_init(plat);
  98
  99         ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
 100         if (ret)
 101                 return ret;
 102
 103         upriv->mmc = &plat->mmc;
 104         host->mmc = &plat->mmc;
 105         host->mmc->priv = host;
 106
 107         return sdhci_probe(dev);
 108 }
 109
 110 static const struct udevice_id sdhci_cdns_match[] = {
 111         { .compatible = "socionext,uniphier-sd4hc" },
 112         { .compatible = "cdns,sd4hc" },
 113         { /* sentinel */ }
 114 };
 115
 116 U_BOOT_DRIVER(sdhci_cdns) = {
 117         .name = "sdhci-cdns",
 118         .id = UCLASS_MMC,
 119         .of_match = sdhci_cdns_match,
 120         .bind = sdhci_cdns_bind,
 121         .probe = sdhci_cdns_probe,
 122         .priv_auto_alloc_size = sizeof(struct sdhci_host),
 123         .platdata_auto_alloc_size = sizeof(struct sdhci_cdns_plat),
 124         .ops = &sdhci_ops,
 125 };