ARM: S5PC1xx: add platform helpers for SDHCI host controllers

Samsung S5PC100 has 3 SDHCI controllers compatible with the one known from
previous SoCs series. Add required platform setup and support code that
the devices can be used with sdhci-s3c driver.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

4 files changed, 78 insertions, 0 deletions

diff --git a/arch/arm/mach-s5pc100/Kconfig b/arch/arm/mach-s5pc100/Kconfig
index 36e7e0046c15..21b182121945 100644
--- a/arch/arm/mach-s5pc100/Kconfig
+++ b/arch/arm/mach-s5pc100/Kconfig
@@ -14,6 +14,12 @@ config CPU_S5PC100
         help
           Enable S5PC100 CPU support
 
+config S5PC100_SETUP_SDHCI
+        bool
+        select S5PC1XX_SETUP_SDHCI_GPIO
+        help
+          Internal helper functions for S5PC100 based SDHCI systems
+
 config MACH_SMDKC100
         bool "SMDKC100"
         select CPU_S5PC100
diff --git a/arch/arm/mach-s5pc100/Makefile b/arch/arm/mach-s5pc100/Makefile
index afc89b381d7a..809ff10f768f 100644
--- a/arch/arm/mach-s5pc100/Makefile
+++ b/arch/arm/mach-s5pc100/Makefile
@@ -13,5 +13,9 @@ obj-				:=
 
 obj-$(CONFIG_CPU_S5PC100)       += cpu.o
 
+# Helper and device support
+
+obj-$(CONFIG_S5PC100_SETUP_SDHCI)       += setup-sdhci.o
+
 # machine support
 obj-$(CONFIG_MACH_SMDKC100)     += mach-smdkc100.o
diff --git a/arch/arm/mach-s5pc100/cpu.c b/arch/arm/mach-s5pc100/cpu.c
index 1319e3d0ec39..d79e7574a852 100644
--- a/arch/arm/mach-s5pc100/cpu.c
+++ b/arch/arm/mach-s5pc100/cpu.c
@@ -75,6 +75,9 @@ void __init s5pc100_map_io(void)
         iotable_init(s5pc100_iodesc, ARRAY_SIZE(s5pc100_iodesc));
 
         /* initialise device information early */
+        s5pc100_default_sdhci0();
+        s5pc100_default_sdhci1();
+        s5pc100_default_sdhci2();
 
         /* the i2c devices are directly compatible with s3c2440 */
         s3c_i2c0_setname("s3c2440-i2c");
diff --git a/arch/arm/mach-s5pc100/setup-sdhci.c b/arch/arm/mach-s5pc100/setup-sdhci.c
new file mode 100644
index 000000000000..4385986a3da0
--- /dev/null
+++ b/arch/arm/mach-s5pc100/setup-sdhci.c
@@ -0,0 +1,65 @@
+/* linux/arch/arm/mach-s5pc100/setup-sdhci.c
+ *
+ * Copyright 2008 Samsung Electronics
+ *
+ * S5PC100 - Helper functions for settign up SDHCI device(s) (HSMMC)
+ *
+ * Based on mach-s3c6410/setup-sdhci.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+
+#include <plat/regs-sdhci.h>
+#include <plat/sdhci.h>
+
+/* clock sources for the mmc bus clock, order as for the ctrl2[5..4] */
+
+char *s5pc100_hsmmc_clksrcs[4] = {
+        [0] = "hsmmc",
+        [1] = "hsmmc",
+        /* [2] = "mmc_bus", not yet succesfuuly used yet */
+        /* [3] = "48m", - note not succesfully used yet */
+};
+
+
+void s5pc100_setup_sdhci0_cfg_card(struct platform_device *dev,
+                                    void __iomem *r,
+                                    struct mmc_ios *ios,
+                                    struct mmc_card *card)
+{
+        u32 ctrl2, ctrl3;
+
+        /* don't need to alter anything acording to card-type */
+
+        writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA, r + S3C64XX_SDHCI_CONTROL4);
+
+        ctrl2 = readl(r + S3C_SDHCI_CONTROL2);
+        ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
+        ctrl2 |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
+                  S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
+                  S3C_SDHCI_CTRL2_ENFBCLKRX |
+                  S3C_SDHCI_CTRL2_DFCNT_NONE |
+                  S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
+
+        if (ios->clock < 25 * 1000000)
+                ctrl3 = (S3C_SDHCI_CTRL3_FCSEL3 |
+                         S3C_SDHCI_CTRL3_FCSEL2 |
+                         S3C_SDHCI_CTRL3_FCSEL1 |
+                         S3C_SDHCI_CTRL3_FCSEL0);
+        else
+                ctrl3 = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
+
+        writel(ctrl2, r + S3C_SDHCI_CONTROL2);
+        writel(ctrl3, r + S3C_SDHCI_CONTROL3);
+}