drivers/mmc/snps_dw_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Synopsys DesignWare Multimedia Card Interface driver
   4  * extensions used in various Synopsys ARC devboards.
   5  *
   6  * Copyright (C) 2019 Synopsys
   7  * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
   8  */
   9
  10 #include <common.h>
  11 #include <clk.h>
  12 #include <dm.h>
  13 #include <dwmmc.h>
  14 #include <errno.h>
  15 #include <fdtdec.h>
  16 #include <linux/libfdt.h>
  17 #include <linux/err.h>
  18 #include <malloc.h>
  19
  20 #define CLOCK_MIN               400000  /*  400 kHz */
  21 #define FIFO_MIN                8
  22 #define FIFO_MAX                4096
  23
  24 struct snps_dwmci_plat {
  25         struct mmc_config       cfg;
  26         struct mmc              mmc;
  27 };
  28
  29 struct snps_dwmci_priv_data {
  30         struct dwmci_host       host;
  31         u32                     f_max;
  32 };
  33
  34 static int snps_dwmmc_clk_setup(struct udevice *dev)
  35 {
  36         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
  37         struct dwmci_host *host = &priv->host;
  38
  39         struct clk clk_ciu, clk_biu;
  40         int ret;
  41
  42         ret = clk_get_by_name(dev, "ciu", &clk_ciu);
  43         if (ret)
  44                 goto clk_err;
  45
  46         ret = clk_enable(&clk_ciu);
  47         if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
  48                 goto clk_err_ciu;
  49
  50         host->bus_hz = clk_get_rate(&clk_ciu);
  51         if (host->bus_hz < CLOCK_MIN) {
  52                 ret = -EINVAL;
  53                 goto clk_err_ciu_dis;
  54         }
  55
  56         ret = clk_get_by_name(dev, "biu", &clk_biu);
  57         if (ret)
  58                 goto clk_err_ciu_dis;
  59
  60         ret = clk_enable(&clk_biu);
  61         if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
  62                 goto clk_err_biu;
  63
  64         return 0;
  65
  66 clk_err_biu:
  67         clk_free(&clk_biu);
  68 clk_err_ciu_dis:
  69         clk_disable(&clk_ciu);
  70 clk_err_ciu:
  71         clk_free(&clk_ciu);
  72 clk_err:
  73         dev_err(dev, "failed to setup clocks, ret %d\n", ret);
  74
  75         return ret;
  76 }
  77
  78 static int snps_dwmmc_ofdata_to_platdata(struct udevice *dev)
  79 {
  80         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
  81         struct dwmci_host *host = &priv->host;
  82         u32 fifo_depth;
  83         int ret;
  84
  85         host->ioaddr = devfdt_get_addr_ptr(dev);
  86
  87         /*
  88          * If fifo-depth is unset don't set fifoth_val - we will try to
  89          * auto detect it.
  90          */
  91         ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
  92         if (!ret) {
  93                 if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
  94                         return -EINVAL;
  95
  96                 host->fifoth_val = MSIZE(0x2) |
  97                                    RX_WMARK(fifo_depth / 2 - 1) |
  98                                    TX_WMARK(fifo_depth / 2);
  99         }
 100
 101         host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
 102         if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
 103                 return -EINVAL;
 104
 105         /*
 106          * If max-frequency is unset don't set priv->f_max - we will use
 107          * host->bus_hz in probe() instead.
 108          */
 109         ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
 110         if (!ret && priv->f_max < CLOCK_MIN)
 111                 return -EINVAL;
 112
 113         host->fifo_mode = dev_read_bool(dev, "fifo-mode");
 114         host->name = dev->name;
 115         host->dev_index = 0;
 116         host->priv = priv;
 117
 118         return 0;
 119 }
 120
 121 int snps_dwmmc_getcd(struct udevice *dev)
 122 {
 123         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
 124         struct dwmci_host *host = &priv->host;
 125
 126         return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
 127 }
 128
 129 struct dm_mmc_ops snps_dwmci_dm_ops;
 130
 131 static int snps_dwmmc_probe(struct udevice *dev)
 132 {
 133 #ifdef CONFIG_BLK
 134         struct snps_dwmci_plat *plat = dev_get_platdata(dev);
 135 #endif
 136         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 137         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
 138         struct dwmci_host *host = &priv->host;
 139         unsigned int clock_max;
 140         int ret;
 141
 142         /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
 143         memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
 144         snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
 145
 146         ret = snps_dwmmc_clk_setup(dev);
 147         if (ret)
 148                 return ret;
 149
 150         if (!priv->f_max)
 151                 clock_max = host->bus_hz;
 152         else
 153                 clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
 154
 155 #ifdef CONFIG_BLK
 156         dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
 157         host->mmc = &plat->mmc;
 158 #else
 159         ret = add_dwmci(host, clock_max, CLOCK_MIN);
 160         if (ret)
 161                 return ret;
 162 #endif
 163         host->mmc->priv = &priv->host;
 164         upriv->mmc = host->mmc;
 165         host->mmc->dev = dev;
 166
 167         return dwmci_probe(dev);
 168 }
 169
 170 static int snps_dwmmc_bind(struct udevice *dev)
 171 {
 172 #ifdef CONFIG_BLK
 173         struct snps_dwmci_plat *plat = dev_get_platdata(dev);
 174         int ret;
 175
 176         ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
 177         if (ret)
 178                 return ret;
 179 #endif
 180
 181         return 0;
 182 }
 183
 184 static const struct udevice_id snps_dwmmc_ids[] = {
 185         { .compatible = "snps,dw-mshc" },
 186         { }
 187 };
 188
 189 U_BOOT_DRIVER(snps_dwmmc_drv) = {
 190         .name                           = "snps_dw_mmc",
 191         .id                             = UCLASS_MMC,
 192         .of_match                       = snps_dwmmc_ids,
 193         .ofdata_to_platdata             = snps_dwmmc_ofdata_to_platdata,
 194         .ops                            = &snps_dwmci_dm_ops,
 195         .bind                           = snps_dwmmc_bind,
 196         .probe                          = snps_dwmmc_probe,
 197         .priv_auto_alloc_size           = sizeof(struct snps_dwmci_priv_data),
 198         .platdata_auto_alloc_size       = sizeof(struct snps_dwmci_plat),
 199 };