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/dwmmc.h>
  10 #include <asm/arch/system_manager.h>
  11 #include <dm.h>
  12 #include <dwmmc.h>
  13 #include <errno.h>
  14 #include <fdtdec.h>
  15 #include <libfdt.h>
  16 #include <linux/err.h>
  17 #include <malloc.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 static const struct socfpga_clock_manager *clock_manager_base =
  22                 (void *)SOCFPGA_CLKMGR_ADDRESS;
  23 static const struct socfpga_system_manager *system_manager_base =
  24                 (void *)SOCFPGA_SYSMGR_ADDRESS;
  25
  26 /* socfpga implmentation specific driver private data */
  27 struct dwmci_socfpga_priv_data {
  28         struct dwmci_host       host;
  29         unsigned int            drvsel;
  30         unsigned int            smplsel;
  31 };
  32
  33 static void socfpga_dwmci_clksel(struct dwmci_host *host)
  34 {
  35         struct dwmci_socfpga_priv_data *priv = host->priv;
  36
  37         /* Disable SDMMC clock. */
  38         clrbits_le32(&clock_manager_base->per_pll.en,
  39                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  40
  41         debug("%s: drvsel %d smplsel %d\n", __func__,
  42               priv->drvsel, priv->smplsel);
  43         writel(SYSMGR_SDMMC_CTRL_SET(priv->smplsel, priv->drvsel),
  44                 &system_manager_base->sdmmcgrp_ctrl);
  45
  46         debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
  47                 readl(&system_manager_base->sdmmcgrp_ctrl));
  48
  49         /* Enable SDMMC clock */
  50         setbits_le32(&clock_manager_base->per_pll.en,
  51                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  52 }
  53
  54 static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
  55 {
  56         /* FIXME: probe from DT eventually too/ */
  57         const unsigned long clk = cm_get_mmc_controller_clk_hz();
  58
  59         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
  60         struct dwmci_host *host = &priv->host;
  61         int fifo_depth;
  62
  63         if (clk == 0) {
  64                 printf("DWMMC: MMC clock is zero!");
  65                 return -EINVAL;
  66         }
  67
  68         fifo_depth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  69                                     "fifo-depth", 0);
  70         if (fifo_depth < 0) {
  71                 printf("DWMMC: Can't get FIFO depth\n");
  72                 return -EINVAL;
  73         }
  74
  75         host->name = dev->name;
  76         host->ioaddr = (void *)dev_get_addr(dev);
  77         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  78                                         "bus-width", 4);
  79         host->clksel = socfpga_dwmci_clksel;
  80
  81         /*
  82          * TODO(sjg@chromium.org): Remove the need for this hack.
  83          * We only have one dwmmc block on gen5 SoCFPGA.
  84          */
  85         host->dev_index = 0;
  86         /* Fixed clock divide by 4 which due to the SDMMC wrapper */
  87         host->bus_hz = clk;
  88         host->fifoth_val = MSIZE(0x2) |
  89                 RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
  90         priv->drvsel = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
  91                                        "drvsel", 3);
  92         priv->smplsel = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
  93                                         "smplsel", 0);
  94         host->priv = priv;
  95
  96         return 0;
  97 }
  98
  99 static int socfpga_dwmmc_probe(struct udevice *dev)
 100 {
 101         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 102         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
 103         struct dwmci_host *host = &priv->host;
 104         int ret;
 105
 106         ret = add_dwmci(host, host->bus_hz, 400000);
 107         if (ret)
 108                 return ret;
 109
 110         upriv->mmc = host->mmc;
 111
 112         return 0;
 113 }
 114
 115 static const struct udevice_id socfpga_dwmmc_ids[] = {
 116         { .compatible = "altr,socfpga-dw-mshc" },
 117         { }
 118 };
 119
 120 U_BOOT_DRIVER(socfpga_dwmmc_drv) = {
 121         .name           = "socfpga_dwmmc",
 122         .id             = UCLASS_MMC,
 123         .of_match       = socfpga_dwmmc_ids,
 124         .ofdata_to_platdata = socfpga_dwmmc_ofdata_to_platdata,
 125         .probe          = socfpga_dwmmc_probe,
 126         .priv_auto_alloc_size = sizeof(struct dwmci_socfpga_priv_data),
 127 };