arch/arm/mach-s3c6400/setup-sdhci.c

   1 /* linux/arch/arm/mach-s3c6410/setup-sdhci.c
   2  *
   3  * Copyright 2008 Simtec Electronics
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C6410 - Helper functions for settign up SDHCI device(s) (HSMMC)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/io.h>
  20
  21 #include <linux/mmc/card.h>
  22 #include <linux/mmc/host.h>
  23
  24 #include <plat/regs-sdhci.h>
  25 #include <plat/sdhci.h>
  26
  27 /* clock sources for the mmc bus clock, order as for the ctrl2[5..4] */
  28
  29 char *s3c6400_hsmmc_clksrcs[4] = {
  30         [0] = "hsmmc",
  31         [1] = "hsmmc",
  32         [2] = "mmc_bus",
  33         /* [3] = "48m", - note not succesfully used yet */
  34 };
  35
  36 void s3c6400_setup_sdhci_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         ctrl2 = readl(r + S3C_SDHCI_CONTROL2);
  44         ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
  45         ctrl2 |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
  46                   S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
  47                   S3C_SDHCI_CTRL2_ENFBCLKRX |
  48                   S3C_SDHCI_CTRL2_DFCNT_NONE |
  49                   S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
  50
  51         if (ios->clock < 25 * 1000000)
  52                 ctrl3 = (S3C_SDHCI_CTRL3_FCSEL3 |
  53                          S3C_SDHCI_CTRL3_FCSEL2 |
  54                          S3C_SDHCI_CTRL3_FCSEL1 |
  55                          S3C_SDHCI_CTRL3_FCSEL0);
  56         else
  57                 ctrl3 = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
  58
  59         printk(KERN_INFO "%s: CTRL 2=%08x, 3=%08x\n", __func__, ctrl2, ctrl3);
  60         writel(ctrl2, r + S3C_SDHCI_CONTROL2);
  61         writel(ctrl3, r + S3C_SDHCI_CONTROL3);
  62 }
  63