ARM: S5P: Add support for common MIPI CSIS/DSIM D-PHY control

Add common code for MIPI-CSIS and MIPI-DSIM drivers to support
their corresponding D-PHY's enable and reset control.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

3 files changed, 69 insertions, 0 deletions

diff --git a/arch/arm/plat-s5p/Kconfig b/arch/arm/plat-s5p/Kconfig
index 6390ac728b35..463d3aac83e4 100644
--- a/arch/arm/plat-s5p/Kconfig
+++ b/arch/arm/plat-s5p/Kconfig
@@ -74,3 +74,8 @@ config S5P_DEV_CSIS1
         bool
         help
           Compile in platform device definitions for MIPI-CSIS channel 1
+
+config S5P_SETUP_MIPIPHY
+        bool
+        help
+          Compile in common setup code for MIPI-CSIS and MIPI-DSIM devices
diff --git a/arch/arm/plat-s5p/Makefile b/arch/arm/plat-s5p/Makefile
index 4bd5cf908977..79ee7bb08cef 100644
--- a/arch/arm/plat-s5p/Makefile
+++ b/arch/arm/plat-s5p/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_S5P_DEV_FIMC2)	+= dev-fimc2.o
 obj-$(CONFIG_S5P_DEV_ONENAND)   += dev-onenand.o
 obj-$(CONFIG_S5P_DEV_CSIS0)     += dev-csis0.o
 obj-$(CONFIG_S5P_DEV_CSIS1)     += dev-csis1.o
+obj-$(CONFIG_S5P_SETUP_MIPIPHY) += setup-mipiphy.o
diff --git a/arch/arm/plat-s5p/setup-mipiphy.c b/arch/arm/plat-s5p/setup-mipiphy.c
new file mode 100644
index 000000000000..683c466c0e6a
--- /dev/null
+++ b/arch/arm/plat-s5p/setup-mipiphy.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics Co., Ltd.
+ *
+ * S5P - Helper functions for MIPI-CSIS and MIPI-DSIM D-PHY control
+ *
+ * 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/platform_device.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <mach/regs-clock.h>
+
+static int __s5p_mipi_phy_control(struct platform_device *pdev,
+                                  bool on, u32 reset)
+{
+        static DEFINE_SPINLOCK(lock);
+        void __iomem *addr;
+        unsigned long flags;
+        int pid;
+        u32 cfg;
+
+        if (!pdev)
+                return -EINVAL;
+
+        pid = (pdev->id == -1) ? 0 : pdev->id;
+
+        if (pid != 0 && pid != 1)
+                return -EINVAL;
+
+        addr = S5P_MIPI_DPHY_CONTROL(pid);
+
+        spin_lock_irqsave(&lock, flags);
+
+        cfg = __raw_readl(addr);
+        cfg = on ? (cfg | reset) : (cfg & ~reset);
+        __raw_writel(cfg, addr);
+
+        if (on) {
+                cfg |= S5P_MIPI_DPHY_ENABLE;
+        } else if (!(cfg & (S5P_MIPI_DPHY_SRESETN |
+                            S5P_MIPI_DPHY_MRESETN) & ~reset)) {
+                cfg &= ~S5P_MIPI_DPHY_ENABLE;
+        }
+
+        __raw_writel(cfg, addr);
+        spin_unlock_irqrestore(&lock, flags);
+
+        return 0;
+}
+
+int s5p_csis_phy_enable(struct platform_device *pdev, bool on)
+{
+        return __s5p_mipi_phy_control(pdev, on, S5P_MIPI_DPHY_SRESETN);
+}
+
+int s5p_dsim_phy_enable(struct platform_device *pdev, bool on)
+{
+        return __s5p_mipi_phy_control(pdev, on, S5P_MIPI_DPHY_MRESETN);
+}