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 <syscon.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/periph.h>
  15 #include <linux/err.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 struct rockchip_dwmmc_priv {
  20         struct udevice *clk;
  21         struct rk3288_grf *grf;
  22         struct dwmci_host host;
  23 };
  24
  25 static uint rockchip_dwmmc_get_mmc_clk(struct dwmci_host *host, uint freq)
  26 {
  27         struct udevice *dev = host->priv;
  28         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  29         int ret;
  30
  31         ret = clk_set_periph_rate(priv->clk, PERIPH_ID_SDMMC0 + host->dev_index,
  32                                   freq);
  33         if (ret < 0) {
  34                 debug("%s: err=%d\n", __func__, ret);
  35                 return ret;
  36         }
  37
  38         return freq;
  39 }
  40
  41 static int rockchip_dwmmc_ofdata_to_platdata(struct udevice *dev)
  42 {
  43         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  44         struct dwmci_host *host = &priv->host;
  45
  46         host->name = dev->name;
  47         host->ioaddr = (void *)dev_get_addr(dev);
  48         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  49                                         "bus-width", 4);
  50         host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
  51         host->priv = dev;
  52
  53         /* use non-removeable as sdcard and emmc as judgement */
  54         if (fdtdec_get_bool(gd->fdt_blob, dev->of_offset, "non-removable"))
  55                 host->dev_index = 0;
  56         else
  57                 host->dev_index = 1;
  58
  59         return 0;
  60 }
  61
  62 static int rockchip_dwmmc_probe(struct udevice *dev)
  63 {
  64         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
  65         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
  66         struct dwmci_host *host = &priv->host;
  67         u32 minmax[2];
  68         int ret;
  69         int fifo_depth;
  70
  71         priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
  72         if (IS_ERR(priv->grf))
  73                 return PTR_ERR(priv->grf);
  74         ret = uclass_get_device(UCLASS_CLK, CLK_GENERAL, &priv->clk);
  75         if (ret)
  76                 return 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         ret = add_dwmci(host, minmax[1], minmax[0]);
  94         if (ret)
  95                 return ret;
  96
  97         upriv->mmc = host->mmc;
  98
  99         return 0;
 100 }
 101
 102 static const struct udevice_id rockchip_dwmmc_ids[] = {
 103         { .compatible = "rockchip,rk3288-dw-mshc" },
 104         { }
 105 };
 106
 107 U_BOOT_DRIVER(rockchip_dwmmc_drv) = {
 108         .name           = "rockchip_dwmmc",
 109         .id             = UCLASS_MMC,
 110         .of_match       = rockchip_dwmmc_ids,
 111         .ofdata_to_platdata = rockchip_dwmmc_ofdata_to_platdata,
 112         .probe          = rockchip_dwmmc_probe,
 113         .priv_auto_alloc_size = sizeof(struct rockchip_dwmmc_priv),
 114 };