drivers/mmc/socfpga_dw_mmc.c

   1 /*
   2  * (C) Copyright 2013 Altera Corporation <www.altera.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/arch/clock_manager.h>
   9 #include <asm/arch/system_manager.h>
  10 #include <dm.h>
  11 #include <dwmmc.h>
  12 #include <errno.h>
  13 #include <fdtdec.h>
  14 #include <libfdt.h>
  15 #include <linux/err.h>
  16 #include <malloc.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static const struct socfpga_clock_manager *clock_manager_base =
  21                 (void *)SOCFPGA_CLKMGR_ADDRESS;
  22 static const struct socfpga_system_manager *system_manager_base =
  23                 (void *)SOCFPGA_SYSMGR_ADDRESS;
  24
  25 struct socfpga_dwmci_plat {
  26         struct mmc_config cfg;
  27         struct mmc mmc;
  28 };
  29
  30 /* socfpga implmentation specific driver private data */
  31 struct dwmci_socfpga_priv_data {
  32         struct dwmci_host       host;
  33         unsigned int            drvsel;
  34         unsigned int            smplsel;
  35 };
  36
  37 static void socfpga_dwmci_clksel(struct dwmci_host *host)
  38 {
  39         struct dwmci_socfpga_priv_data *priv = host->priv;
  40         u32 sdmmc_mask = ((priv->smplsel & 0x7) << SYSMGR_SDMMC_SMPLSEL_SHIFT) |
  41                          ((priv->drvsel & 0x7) << SYSMGR_SDMMC_DRVSEL_SHIFT);
  42
  43         /* Disable SDMMC clock. */
  44         clrbits_le32(&clock_manager_base->per_pll.en,
  45                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  46
  47         debug("%s: drvsel %d smplsel %d\n", __func__,
  48               priv->drvsel, priv->smplsel);
  49         writel(sdmmc_mask, &system_manager_base->sdmmcgrp_ctrl);
  50
  51         debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
  52                 readl(&system_manager_base->sdmmcgrp_ctrl));
  53
  54         /* Enable SDMMC clock */
  55         setbits_le32(&clock_manager_base->per_pll.en,
  56                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  57 }
  58
  59 static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
  60 {
  61         /* FIXME: probe from DT eventually too/ */
  62         const unsigned long clk = cm_get_mmc_controller_clk_hz();
  63
  64         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
  65         struct dwmci_host *host = &priv->host;
  66         int fifo_depth;
  67
  68         if (clk == 0) {
  69                 printf("DWMMC: MMC clock is zero!");
  70                 return -EINVAL;
  71         }
  72
  73         fifo_depth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  74                                     "fifo-depth", 0);
  75         if (fifo_depth < 0) {
  76                 printf("DWMMC: Can't get FIFO depth\n");
  77                 return -EINVAL;
  78         }
  79
  80         host->name = dev->name;
  81         host->ioaddr = (void *)devfdt_get_addr(dev);
  82         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
  83                                         "bus-width", 4);
  84         host->clksel = socfpga_dwmci_clksel;
  85
  86         /*
  87          * TODO(sjg@chromium.org): Remove the need for this hack.
  88          * We only have one dwmmc block on gen5 SoCFPGA.
  89          */
  90         host->dev_index = 0;
  91         /* Fixed clock divide by 4 which due to the SDMMC wrapper */
  92         host->bus_hz = clk;
  93         host->fifoth_val = MSIZE(0x2) |
  94                 RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
  95         priv->drvsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
  96                                        "drvsel", 3);
  97         priv->smplsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
  98                                         "smplsel", 0);
  99         host->priv = priv;
 100
 101         return 0;
 102 }
 103
 104 static int socfpga_dwmmc_probe(struct udevice *dev)
 105 {
 106 #ifdef CONFIG_BLK
 107         struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
 108 #endif
 109         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 110         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
 111         struct dwmci_host *host = &priv->host;
 112
 113 #ifdef CONFIG_BLK
 114         dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
 115         host->mmc = &plat->mmc;
 116 #else
 117         int ret;
 118
 119         ret = add_dwmci(host, host->bus_hz, 400000);
 120         if (ret)
 121                 return ret;
 122 #endif
 123         host->mmc->priv = &priv->host;
 124         upriv->mmc = host->mmc;
 125         host->mmc->dev = dev;
 126
 127         return 0;
 128 }
 129
 130 static int socfpga_dwmmc_bind(struct udevice *dev)
 131 {
 132 #ifdef CONFIG_BLK
 133         struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
 134         int ret;
 135
 136         ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
 137         if (ret)
 138                 return ret;
 139 #endif
 140
 141         return 0;
 142 }
 143
 144 static const struct udevice_id socfpga_dwmmc_ids[] = {
 145         { .compatible = "altr,socfpga-dw-mshc" },
 146         { }
 147 };
 148
 149 U_BOOT_DRIVER(socfpga_dwmmc_drv) = {
 150         .name           = "socfpga_dwmmc",
 151         .id             = UCLASS_MMC,
 152         .of_match       = socfpga_dwmmc_ids,
 153         .ofdata_to_platdata = socfpga_dwmmc_ofdata_to_platdata,
 154         .ops            = &dm_dwmci_ops,
 155         .bind           = socfpga_dwmmc_bind,
 156         .probe          = socfpga_dwmmc_probe,
 157         .priv_auto_alloc_size = sizeof(struct dwmci_socfpga_priv_data),
 158         .platdata_auto_alloc_size = sizeof(struct socfpga_dwmci_plat),
 159 };