drivers/mmc/rockchip_dw_mmc.c

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <dm.h>
  10 #include <dt-structs.h>
  11 #include <dwmmc.h>
  12 #include <errno.h>
  13 #include <mapmem.h>
  14 #include <pwrseq.h>
  15 #include <syscon.h>
  16 #include <asm/gpio.h>
  17 #include <asm/arch/clock.h>
  18 #include <asm/arch/periph.h>
  19 #include <linux/err.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 struct rockchip_mmc_plat {
  24 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  25         struct dtd_rockchip_rk3288_dw_mshc dtplat;
  26 #endif
  27         struct mmc_config cfg;
  28         struct mmc mmc;
  29 };
  30
  31 struct rockchip_dwmmc_priv {
  32         struct clk clk;
  33         struct dwmci_host host;
  34         int fifo_depth;
  35         bool fifo_mode;
  36         u32 minmax[2];
  37 };
  38
  39 static uint rockchip_dwmmc_get_mmc_clk(struct dwmci_host *host, uint freq)
  40 {
  41         struct udevice *dev = host->priv;
  42         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  43         int ret;
  44
  45         ret = clk_set_rate(&priv->clk, freq);
  46         if (ret < 0) {
  47                 debug("%s: err=%d\n", __func__, ret);
  48                 return ret;
  49         }
  50
  51         return freq;
  52 }
  53
  54 static int rockchip_dwmmc_ofdata_to_platdata(struct udevice *dev)
  55 {
  56 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
  57         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  58         struct dwmci_host *host = &priv->host;
  59
  60         host->name = dev->name;
  61         host->ioaddr = (void *)dev_get_addr(dev);
  62         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  63                                         "bus-width", 4);
  64         host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
  65         host->priv = dev;
  66
  67         /* use non-removeable as sdcard and emmc as judgement */
  68         if (fdtdec_get_bool(gd->fdt_blob, dev->of_offset, "non-removable"))
  69                 host->dev_index = 0;
  70         else
  71                 host->dev_index = 1;
  72
  73         priv->fifo_depth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  74                                     "fifo-depth", 0);
  75         if (priv->fifo_depth < 0)
  76                 return -EINVAL;
  77         priv->fifo_mode = fdtdec_get_bool(gd->fdt_blob, dev->of_offset,
  78                                           "fifo-mode");
  79         if (fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
  80                                  "clock-freq-min-max", priv->minmax, 2))
  81                 return -EINVAL;
  82 #endif
  83         return 0;
  84 }
  85
  86 static int rockchip_dwmmc_probe(struct udevice *dev)
  87 {
  88         struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
  89         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  90         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  91         struct dwmci_host *host = &priv->host;
  92         struct udevice *pwr_dev __maybe_unused;
  93         int ret;
  94
  95 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  96         struct dtd_rockchip_rk3288_dw_mshc *dtplat = &plat->dtplat;
  97
  98         host->name = dev->name;
  99         host->ioaddr = map_sysmem(dtplat->reg[0], dtplat->reg[1]);
 100         host->buswidth = dtplat->bus_width;
 101         host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
 102         host->priv = dev;
 103         host->dev_index = 0;
 104         priv->fifo_depth = dtplat->fifo_depth;
 105         priv->fifo_mode = 0;
 106         memcpy(priv->minmax, dtplat->clock_freq_min_max, sizeof(priv->minmax));
 107
 108         ret = clk_get_by_index_platdata(dev, 0, dtplat->clocks, &priv->clk);
 109         if (ret < 0)
 110                 return ret;
 111 #else
 112         ret = clk_get_by_index(dev, 0, &priv->clk);
 113         if (ret < 0)
 114                 return ret;
 115 #endif
 116         host->fifoth_val = MSIZE(0x2) |
 117                 RX_WMARK(priv->fifo_depth / 2 - 1) |
 118                 TX_WMARK(priv->fifo_depth / 2);
 119
 120         host->fifo_mode = priv->fifo_mode;
 121
 122 #ifdef CONFIG_PWRSEQ
 123         /* Enable power if needed */
 124         ret = uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
 125                                            &pwr_dev);
 126         if (!ret) {
 127                 ret = pwrseq_set_power(pwr_dev, true);
 128                 if (ret)
 129                         return ret;
 130         }
 131 #endif
 132         dwmci_setup_cfg(&plat->cfg, dev->name, host->buswidth, host->caps,
 133                         priv->minmax[1], priv->minmax[0]);
 134         host->mmc = &plat->mmc;
 135         host->mmc->priv = &priv->host;
 136         host->mmc->dev = dev;
 137         upriv->mmc = host->mmc;
 138
 139         return dwmci_probe(dev);
 140 }
 141
 142 static int rockchip_dwmmc_bind(struct udevice *dev)
 143 {
 144         struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
 145         int ret;
 146
 147         ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
 148         if (ret)
 149                 return ret;
 150
 151         return 0;
 152 }
 153
 154 static const struct udevice_id rockchip_dwmmc_ids[] = {
 155         { .compatible = "rockchip,rk3288-dw-mshc" },
 156         { }
 157 };
 158
 159 U_BOOT_DRIVER(rockchip_dwmmc_drv) = {
 160         .name           = "rockchip_rk3288_dw_mshc",
 161         .id             = UCLASS_MMC,
 162         .of_match       = rockchip_dwmmc_ids,
 163         .ofdata_to_platdata = rockchip_dwmmc_ofdata_to_platdata,
 164         .ops            = &dm_dwmci_ops,
 165         .bind           = rockchip_dwmmc_bind,
 166         .probe          = rockchip_dwmmc_probe,
 167         .priv_auto_alloc_size = sizeof(struct rockchip_dwmmc_priv),
 168         .platdata_auto_alloc_size = sizeof(struct rockchip_mmc_plat),
 169 };
 170
 171 #ifdef CONFIG_PWRSEQ
 172 static int rockchip_dwmmc_pwrseq_set_power(struct udevice *dev, bool enable)
 173 {
 174         struct gpio_desc reset;
 175         int ret;
 176
 177         ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
 178         if (ret)
 179                 return ret;
 180         dm_gpio_set_value(&reset, 1);
 181         udelay(1);
 182         dm_gpio_set_value(&reset, 0);
 183         udelay(200);
 184
 185         return 0;
 186 }
 187
 188 static const struct pwrseq_ops rockchip_dwmmc_pwrseq_ops = {
 189         .set_power      = rockchip_dwmmc_pwrseq_set_power,
 190 };
 191
 192 static const struct udevice_id rockchip_dwmmc_pwrseq_ids[] = {
 193         { .compatible = "mmc-pwrseq-emmc" },
 194         { }
 195 };
 196
 197 U_BOOT_DRIVER(rockchip_dwmmc_pwrseq_drv) = {
 198         .name           = "mmc_pwrseq_emmc",
 199         .id             = UCLASS_PWRSEQ,
 200         .of_match       = rockchip_dwmmc_pwrseq_ids,
 201         .ops            = &rockchip_dwmmc_pwrseq_ops,
 202 };
 203 #endif