Davinci: pinmux - use ioremap()

This patch modifies the pinmux implementation so as to ioremap() the pinmux
register area on first use.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
index e9d530a8f79f..f34a8dcdae2b 100644
--- a/arch/arm/mach-davinci/mux.c
+++ b/arch/arm/mach-davinci/mux.c
@@ -22,6 +22,8 @@
 #include <mach/mux.h>
 #include <mach/common.h>
 
+static void __iomem *pinmux_base;
+
 /*
  * Sets the DAVINCI MUX register based on the table
  */
@@ -29,14 +31,19 @@ int __init_or_module davinci_cfg_reg(const unsigned long index)
 {
         static DEFINE_SPINLOCK(mux_spin_lock);
         struct davinci_soc_info *soc_info = &davinci_soc_info;
-        void __iomem *base = soc_info->pinmux_base;
         unsigned long flags;
         const struct mux_config *cfg;
         unsigned int reg_orig = 0, reg = 0;
         unsigned int mask, warn = 0;
 
-        if (!soc_info->pinmux_pins)
-                BUG();
+        if (WARN_ON(!soc_info->pinmux_pins))
+                return -ENODEV;
+
+        if (!pinmux_base) {
+                pinmux_base = ioremap(soc_info->pinmux_base, SZ_4K);
+                if (WARN_ON(!pinmux_base))
+                        return -ENOMEM;
+        }
 
         if (index >= soc_info->pinmux_pins_num) {
                 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
@@ -57,7 +64,7 @@ int __init_or_module davinci_cfg_reg(const unsigned long index)
                 unsigned        tmp1, tmp2;
 
                 spin_lock_irqsave(&mux_spin_lock, flags);
-                reg_orig = __raw_readl(base + cfg->mux_reg);
+                reg_orig = __raw_readl(pinmux_base + cfg->mux_reg);
 
                 mask = (cfg->mask << cfg->mask_offset);
                 tmp1 = reg_orig & mask;
@@ -69,7 +76,7 @@ int __init_or_module davinci_cfg_reg(const unsigned long index)
                 if (tmp1 != tmp2)
                         warn = 1;
 
-                __raw_writel(reg, base + cfg->mux_reg);
+                __raw_writel(reg, pinmux_base + cfg->mux_reg);
                 spin_unlock_irqrestore(&mux_spin_lock, flags);
         }