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