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                 printf("%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 *)devfdt_get_addr(dev);
  62         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  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(dev), "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(dev),
  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(dev),
  78                                           "fifo-mode");
  79
  80         /*
  81          * 'clock-freq-min-max' is deprecated
  82          * (see https://github.com/torvalds/linux/commit/b023030f10573de738bbe8df63d43acab64c9f7b)
  83          */
  84         if (fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
  85                                  "clock-freq-min-max", priv->minmax, 2)) {
  86                 int val = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  87                                           "max-frequency", -EINVAL);
  88
  89                 if (val < 0)
  90                         return val;
  91
  92                 priv->minmax[0] = 400000;  /* 400 kHz */
  93                 priv->minmax[1] = val;
  94         } else {
  95                 debug("%s: 'clock-freq-min-max' property was deprecated.\n",
  96                       __func__);
  97         }
  98 #endif
  99         return 0;
 100 }
 101
 102 static int rockchip_dwmmc_probe(struct udevice *dev)
 103 {
 104         struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
 105         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 106         struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
 107         struct dwmci_host *host = &priv->host;
 108         struct udevice *pwr_dev __maybe_unused;
 109         int ret;
 110
 111 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 112         struct dtd_rockchip_rk3288_dw_mshc *dtplat = &plat->dtplat;
 113
 114         host->name = dev->name;
 115         host->ioaddr = map_sysmem(dtplat->reg[0], dtplat->reg[1]);
 116         host->buswidth = dtplat->bus_width;
 117         host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
 118         host->priv = dev;
 119         host->dev_index = 0;
 120         priv->fifo_depth = dtplat->fifo_depth;
 121         priv->fifo_mode = 0;
 122         memcpy(priv->minmax, dtplat->clock_freq_min_max, sizeof(priv->minmax));
 123
 124         ret = clk_get_by_index_platdata(dev, 0, dtplat->clocks, &priv->clk);
 125         if (ret < 0)
 126                 return ret;
 127 #else
 128         ret = clk_get_by_name(dev, "ciu", &priv->clk);
 129         if (ret < 0)
 130                 return ret;
 131 #endif
 132         host->fifoth_val = MSIZE(0x2) |
 133                 RX_WMARK(priv->fifo_depth / 2 - 1) |
 134                 TX_WMARK(priv->fifo_depth / 2);
 135
 136         host->fifo_mode = priv->fifo_mode;
 137
 138 #ifdef CONFIG_PWRSEQ
 139         /* Enable power if needed */
 140         ret = uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
 141                                            &pwr_dev);
 142         if (!ret) {
 143                 ret = pwrseq_set_power(pwr_dev, true);
 144                 if (ret)
 145                         return ret;
 146         }
 147 #endif
 148         dwmci_setup_cfg(&plat->cfg, host, priv->minmax[1], priv->minmax[0]);
 149         host->mmc = &plat->mmc;
 150         host->mmc->priv = &priv->host;
 151         host->mmc->dev = dev;
 152         upriv->mmc = host->mmc;
 153
 154         return dwmci_probe(dev);
 155 }
 156
 157 static int rockchip_dwmmc_bind(struct udevice *dev)
 158 {
 159         struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
 160
 161         return dwmci_bind(dev, &plat->mmc, &plat->cfg);
 162 }
 163
 164 static const struct udevice_id rockchip_dwmmc_ids[] = {
 165         { .compatible = "rockchip,rk3288-dw-mshc" },
 166         { }
 167 };
 168
 169 U_BOOT_DRIVER(rockchip_dwmmc_drv) = {
 170         .name           = "rockchip_rk3288_dw_mshc",
 171         .id             = UCLASS_MMC,
 172         .of_match       = rockchip_dwmmc_ids,
 173         .ofdata_to_platdata = rockchip_dwmmc_ofdata_to_platdata,
 174         .ops            = &dm_dwmci_ops,
 175         .bind           = rockchip_dwmmc_bind,
 176         .probe          = rockchip_dwmmc_probe,
 177         .priv_auto_alloc_size = sizeof(struct rockchip_dwmmc_priv),
 178         .platdata_auto_alloc_size = sizeof(struct rockchip_mmc_plat),
 179 };
 180
 181 #ifdef CONFIG_PWRSEQ
 182 static int rockchip_dwmmc_pwrseq_set_power(struct udevice *dev, bool enable)
 183 {
 184         struct gpio_desc reset;
 185         int ret;
 186
 187         ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
 188         if (ret)
 189                 return ret;
 190         dm_gpio_set_value(&reset, 1);
 191         udelay(1);
 192         dm_gpio_set_value(&reset, 0);
 193         udelay(200);
 194
 195         return 0;
 196 }
 197
 198 static const struct pwrseq_ops rockchip_dwmmc_pwrseq_ops = {
 199         .set_power      = rockchip_dwmmc_pwrseq_set_power,
 200 };
 201
 202 static const struct udevice_id rockchip_dwmmc_pwrseq_ids[] = {
 203         { .compatible = "mmc-pwrseq-emmc" },
 204         { }
 205 };
 206
 207 U_BOOT_DRIVER(rockchip_dwmmc_pwrseq_drv) = {
 208         .name           = "mmc_pwrseq_emmc",
 209         .id             = UCLASS_PWRSEQ,
 210         .of_match       = rockchip_dwmmc_pwrseq_ids,
 211         .ops            = &rockchip_dwmmc_pwrseq_ops,
 212 };
 213 #endif