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