arch/arm/mach-s5pc100/setup-sdhci.c

   1 /* linux/arch/arm/mach-s5pc100/setup-sdhci.c
   2  *
   3  * Copyright 2008 Samsung Electronics
   4  *
   5  * S5PC100 - Helper functions for settign up SDHCI device(s) (HSMMC)
   6  *
   7  * Based on mach-s3c6410/setup-sdhci.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12 */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19
  20 #include <linux/mmc/card.h>
  21 #include <linux/mmc/host.h>
  22
  23 #include <plat/regs-sdhci.h>
  24 #include <plat/sdhci.h>
  25
  26 /* clock sources for the mmc bus clock, order as for the ctrl2[5..4] */
  27
  28 char *s5pc100_hsmmc_clksrcs[4] = {
  29         [0] = "hsmmc",          /* HCLK */
  30         /* [1] = "hsmmc",       - duplicate HCLK entry */
  31         [2] = "sclk_mmc",       /* mmc_bus */
  32         /* [3] = "48m",         - note not successfully used yet */
  33 };
  34
  35
  36 void s5pc100_setup_sdhci0_cfg_card(struct platform_device *dev,
  37                                     void __iomem *r,
  38                                     struct mmc_ios *ios,
  39                                     struct mmc_card *card)
  40 {
  41         u32 ctrl2, ctrl3;
  42
  43         /* don't need to alter anything according to card-type */
  44
  45         writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA, r + S3C64XX_SDHCI_CONTROL4);
  46
  47         ctrl2 = readl(r + S3C_SDHCI_CONTROL2);
  48         ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
  49         ctrl2 |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
  50                   S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
  51                   S3C_SDHCI_CTRL2_ENFBCLKRX |
  52                   S3C_SDHCI_CTRL2_DFCNT_NONE |
  53                   S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
  54
  55         if (ios->clock < 25 * 1000000)
  56                 ctrl3 = (S3C_SDHCI_CTRL3_FCSEL3 |
  57                          S3C_SDHCI_CTRL3_FCSEL2 |
  58                          S3C_SDHCI_CTRL3_FCSEL1 |
  59                          S3C_SDHCI_CTRL3_FCSEL0);
  60         else
  61                 ctrl3 = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
  62
  63         writel(ctrl2, r + S3C_SDHCI_CONTROL2);
  64         writel(ctrl3, r + S3C_SDHCI_CONTROL3);
  65 }