drivers/mmc/ca_dw_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2019 Cortina Access
   4  * Arthur Li <arthur.li@cortina-access.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dwmmc.h>
   9 #include <fdtdec.h>
  10 #include <asm/global_data.h>
  11 #include <linux/libfdt.h>
  12 #include <malloc.h>
  13 #include <errno.h>
  14 #include <dm.h>
  15 #include <mapmem.h>
  16
  17 #define SD_CLK_SEL_MASK (0x3)
  18 #define SD_DLL_DEFAULT  (0x143000)
  19 #define SD_SCLK_MAX (200000000)
  20
  21 #define SD_CLK_SEL_200MHZ (0x2)
  22 #define SD_CLK_SEL_100MHZ (0x1)
  23 #define SD_CLK_SEL_50MHZ (0x0)
  24
  25 #define IO_DRV_SD_DS_OFFSET (16)
  26 #define IO_DRV_SD_DS_MASK   (0xff << IO_DRV_SD_DS_OFFSET)
  27
  28 #define MIN_FREQ (400000)
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 struct ca_mmc_plat {
  33         struct mmc_config cfg;
  34         struct mmc mmc;
  35 };
  36
  37 struct ca_dwmmc_priv_data {
  38         struct dwmci_host host;
  39         void __iomem *sd_dll_reg;
  40         void __iomem *io_drv_reg;
  41         u8 ds;
  42 };
  43
  44 static int ca_dwmci_clksel(struct dwmci_host *host)
  45 {
  46         struct ca_dwmmc_priv_data *priv = host->priv;
  47         u32 val = readl(priv->sd_dll_reg);
  48
  49         val &= ~SD_CLK_SEL_MASK;
  50         if (host->bus_hz >= 200000000)
  51                 val |= SD_CLK_SEL_200MHZ;
  52         else if (host->bus_hz >= 100000000)
  53                 val |= SD_CLK_SEL_100MHZ;
  54
  55         writel(val, priv->sd_dll_reg);
  56
  57         return 0;
  58 }
  59
  60 static void ca_dwmci_board_init(struct dwmci_host *host)
  61 {
  62         struct ca_dwmmc_priv_data *priv = host->priv;
  63         u32 val = readl(priv->io_drv_reg);
  64
  65         writel(SD_DLL_DEFAULT, priv->sd_dll_reg);
  66
  67         val &= ~IO_DRV_SD_DS_MASK;
  68         if (priv && priv->ds)
  69                 val |= priv->ds << IO_DRV_SD_DS_OFFSET;
  70         writel(val, priv->io_drv_reg);
  71 }
  72
  73 unsigned int ca_dwmci_get_mmc_clock(struct dwmci_host *host, uint freq)
  74 {
  75         struct ca_dwmmc_priv_data *priv = host->priv;
  76         u8 sd_clk_sel = readl(priv->sd_dll_reg) & SD_CLK_SEL_MASK;
  77         u8 clk_div;
  78
  79         switch (sd_clk_sel) {
  80         case SD_CLK_SEL_50MHZ:
  81                 clk_div = 4;
  82                 break;
  83         case SD_CLK_SEL_100MHZ:
  84                 clk_div = 2;
  85                 break;
  86         default:
  87                 clk_div = 1;
  88         }
  89
  90         return SD_SCLK_MAX / clk_div / (host->div + 1);
  91 }
  92
  93 static int ca_dwmmc_of_to_plat(struct udevice *dev)
  94 {
  95         struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
  96         struct dwmci_host *host = &priv->host;
  97         u32 tmp;
  98
  99         host->name = dev->name;
 100         host->dev_index = 0;
 101
 102         host->buswidth = dev_read_u32_default(dev, "bus-width", 1);
 103         host->bus_hz = dev_read_u32_default(dev, "max-frequency", 50000000);
 104         priv->ds = dev_read_u32_default(dev, "io_ds", 0x33);
 105         host->fifo_mode = dev_read_bool(dev, "fifo-mode");
 106
 107         dev_read_u32(dev, "sd_dll_ctrl", &tmp);
 108         priv->sd_dll_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
 109         if (!priv->sd_dll_reg)
 110                 return -EINVAL;
 111
 112         dev_read_u32(dev, "io_drv_ctrl", &tmp);
 113         priv->io_drv_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
 114         if (!priv->io_drv_reg)
 115                 return -EINVAL;
 116
 117         host->ioaddr = dev_read_addr_ptr(dev);
 118         if (!host->ioaddr)
 119                 return -EINVAL;
 120
 121         host->priv = priv;
 122
 123         return 0;
 124 }
 125
 126 struct dm_mmc_ops ca_dwmci_dm_ops;
 127
 128 static int ca_dwmmc_probe(struct udevice *dev)
 129 {
 130         struct ca_mmc_plat *plat = dev_get_plat(dev);
 131         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 132         struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
 133         struct dwmci_host *host = &priv->host;
 134
 135         memcpy(&ca_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
 136
 137         dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, MIN_FREQ);
 138         if (host->buswidth == 1)
 139                 (&plat->cfg)->host_caps &= ~(MMC_MODE_8BIT | MMC_MODE_4BIT);
 140
 141         host->mmc = &plat->mmc;
 142         host->mmc->priv = &priv->host;
 143         upriv->mmc = host->mmc;
 144         host->mmc->dev = dev;
 145         host->clksel = ca_dwmci_clksel;
 146         host->board_init = ca_dwmci_board_init;
 147         host->get_mmc_clk = ca_dwmci_get_mmc_clock;
 148
 149         return dwmci_probe(dev);
 150 }
 151
 152 static int ca_dwmmc_bind(struct udevice *dev)
 153 {
 154         struct ca_mmc_plat *plat = dev_get_plat(dev);
 155
 156         return dwmci_bind(dev, &plat->mmc, &plat->cfg);
 157 }
 158
 159 static const struct udevice_id ca_dwmmc_ids[] = {
 160         { .compatible = "cortina,ca-mmc" },
 161         { }
 162 };
 163
 164 U_BOOT_DRIVER(ca_dwmmc_drv) = {
 165         .name           = "cortina_dwmmc",
 166         .id             = UCLASS_MMC,
 167         .of_match       = ca_dwmmc_ids,
 168         .of_to_plat = ca_dwmmc_of_to_plat,
 169         .bind           = ca_dwmmc_bind,
 170         .ops            = &ca_dwmci_dm_ops,
 171         .probe          = ca_dwmmc_probe,
 172         .priv_auto      = sizeof(struct ca_dwmmc_priv_data),
 173         .plat_auto      = sizeof(struct ca_mmc_plat),
 174 };