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 <malloc.h>
   9 #include <dwmmc.h>
  10 #include <asm/arch/dwmmc.h>
  11 #include <asm/arch/clock_manager.h>
  12 #include <asm/arch/system_manager.h>
  13
  14 static const struct socfpga_clock_manager *clock_manager_base =
  15                 (void *)SOCFPGA_CLKMGR_ADDRESS;
  16 static const struct socfpga_system_manager *system_manager_base =
  17                 (void *)SOCFPGA_SYSMGR_ADDRESS;
  18
  19 static void socfpga_dwmci_clksel(struct dwmci_host *host)
  20 {
  21         unsigned int drvsel;
  22         unsigned int smplsel;
  23
  24         /* Disable SDMMC clock. */
  25         clrbits_le32(&clock_manager_base->per_pll.en,
  26                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  27
  28         /* Configures drv_sel and smpl_sel */
  29         drvsel = CONFIG_SOCFPGA_DWMMC_DRVSEL;
  30         smplsel = CONFIG_SOCFPGA_DWMMC_SMPSEL;
  31
  32         debug("%s: drvsel %d smplsel %d\n", __func__, drvsel, smplsel);
  33         writel(SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel),
  34                 &system_manager_base->sdmmcgrp_ctrl);
  35
  36         debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
  37                 readl(&system_manager_base->sdmmcgrp_ctrl));
  38
  39         /* Enable SDMMC clock */
  40         setbits_le32(&clock_manager_base->per_pll.en,
  41                 CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
  42 }
  43
  44 int socfpga_dwmmc_init(u32 regbase, int bus_width, int index)
  45 {
  46         struct dwmci_host *host;
  47
  48         /* calloc for zero init */
  49         host = calloc(sizeof(struct dwmci_host), 1);
  50         if (!host) {
  51                 printf("dwmci_host calloc fail!\n");
  52                 return -1;
  53         }
  54
  55         host->name = "SOCFPGA DWMMC";
  56         host->ioaddr = (void *)regbase;
  57         host->buswidth = bus_width;
  58         host->clksel = socfpga_dwmci_clksel;
  59         host->dev_index = index;
  60         /* fixed clock divide by 4 which due to the SDMMC wrapper */
  61         host->bus_hz = CONFIG_SOCFPGA_DWMMC_BUS_HZ;
  62         host->fifoth_val = MSIZE(0x2) |
  63                 RX_WMARK(CONFIG_SOCFPGA_DWMMC_FIFO_DEPTH / 2 - 1) |
  64                 TX_WMARK(CONFIG_SOCFPGA_DWMMC_FIFO_DEPTH / 2);
  65
  66         return add_dwmci(host, host->bus_hz, 400000);
  67 }
  68