ARM: OMAP: Allow registering pin mux function

This patch changes pin multiplexing init to allow registering
custom function. The omap_cfg_reg() func will be split into
omap processor specific functions in later patch.

This is done to make adding omap3 pin multiplexing easier.

Signed-off-by: Tony Lindgren <tony@atomide.com>

4 files changed, 60 insertions, 20 deletions

diff --git a/arch/arm/mach-omap1/mux.c b/arch/arm/mach-omap1/mux.c
index 52c70e5fcf65..d74f6798d081 100644
--- a/arch/arm/mach-omap1/mux.c
+++ b/arch/arm/mach-omap1/mux.c
@@ -32,6 +32,8 @@
 
 #ifdef CONFIG_OMAP_MUX
 
+static struct omap_mux_cfg arch_mux_cfg;
+
 #ifdef CONFIG_ARCH_OMAP730
 struct pin_config __initdata_or_module omap730_pins[] = {
 MUX_CFG_730("E2_730_KBR0",        12,   21,    0,   20,   1, 0)
@@ -310,18 +312,31 @@ MUX_CFG("Y14_1610_CCP_DATAM",	 9,   21,    6,   2,   3,   1,    2,     0,  0)
 };
 #endif  /* CONFIG_ARCH_OMAP15XX || CONFIG_ARCH_OMAP16XX */
 
+int __init_or_module omap1_cfg_reg(const struct pin_config *cfg)
+{
+        return 0;
+}
+
 int __init omap1_mux_init(void)
 {
 
 #ifdef CONFIG_ARCH_OMAP730
-        omap_mux_register(omap730_pins, ARRAY_SIZE(omap730_pins));
+        if (cpu_is_omap730()) {
+                arch_mux_cfg.pins       = omap730_pins;
+                arch_mux_cfg.size       = ARRAY_SIZE(omap730_pins);
+                arch_mux_cfg.cfg_reg    = omap1_cfg_reg;
+        }
 #endif
 
 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
-        omap_mux_register(omap1xxx_pins, ARRAY_SIZE(omap1xxx_pins));
+        if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
+                arch_mux_cfg.pins       = omap1xxx_pins;
+                arch_mux_cfg.size       = ARRAY_SIZE(omap1xxx_pins);
+                arch_mux_cfg.cfg_reg    = omap1_cfg_reg;
+        }
 #endif
 
-        return 0;
+        return omap_mux_register(&arch_mux_cfg);
 }
 
 #endif
diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 05750975d746..351baab0503a 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -32,6 +32,8 @@
 
 #ifdef CONFIG_OMAP_MUX
 
+static struct omap_mux_cfg arch_mux_cfg;
+
 /* NOTE: See mux.h for the enumeration */
 
 struct pin_config __initdata_or_module omap24xx_pins[] = {
@@ -169,10 +171,25 @@ MUX_CFG_24XX("B13_24XX_KBC6",		0x110,	3,	0,	0,	1)
 
 };
 
-int __init omap2_mux_init(void)
+#ifdef CONFIG_ARCH_OMAP24XX
+int __init_or_module omap24xx_cfg_reg(const struct pin_config *cfg)
 {
-        omap_mux_register(omap24xx_pins, ARRAY_SIZE(omap24xx_pins));
         return 0;
 }
+#endif
+
+int __init omap2_mux_init(void)
+{
+
+#ifdef CONFIG_ARCH_OMAP24XX
+        if (cpu_is_omap24xx()) {
+                arch_mux_cfg.pins       = omap24xx_pins;
+                arch_mux_cfg.size       = ARRAY_SIZE(omap24xx_pins);
+                arch_mux_cfg.cfg_reg    = omap24xx_cfg_reg;
+        }
+#endif
+
+        return omap_mux_register(&arch_mux_cfg);
+}
 
 #endif
diff --git a/arch/arm/plat-omap/mux.c b/arch/arm/plat-omap/mux.c
index 75211f20ccb3..d881379111e1 100644
--- a/arch/arm/plat-omap/mux.c
+++ b/arch/arm/plat-omap/mux.c
@@ -36,17 +36,17 @@
 #define OMAP24XX_PULL_ENA       (1 << 3)
 #define OMAP24XX_PULL_UP        (1 << 4)
 
-static struct pin_config * pin_table;
-static unsigned long pin_table_sz;
+static struct omap_mux_cfg *mux_cfg;
 
-extern struct pin_config * omap730_pins;
-extern struct pin_config * omap1xxx_pins;
-extern struct pin_config * omap24xx_pins;
-
-int __init omap_mux_register(struct pin_config * pins, unsigned long size)
+int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
 {
-        pin_table = pins;
-        pin_table_sz = size;
+        if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0
+                        || !arch_mux_cfg->cfg_reg) {
+                printk(KERN_ERR "Invalid pin table\n");
+                return -EINVAL;
+        }
+
+        mux_cfg = arch_mux_cfg;
 
         return 0;
 }
@@ -64,17 +64,19 @@ int __init_or_module omap_cfg_reg(const unsigned long index)
                 pull_orig = 0, pull = 0;
         unsigned int mask, warn = 0;
 
-        if (!pin_table)
-                BUG();
+        if (mux_cfg == NULL) {
+                printk(KERN_ERR "Pin mux table not initialized\n");
+                return -ENODEV;
+        }
 
-        if (index >= pin_table_sz) {
+        if (index >= mux_cfg->size) {
                 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
-                       index, pin_table_sz);
+                       index, mux_cfg->size);
                 dump_stack();
                 return -ENODEV;
         }
 
-        cfg = (struct pin_config *)&pin_table[index];
+        cfg = (struct pin_config *)&mux_cfg->pins[index];
         if (cpu_is_omap24xx()) {
                 u8 reg = 0;
 
diff --git a/include/asm-arm/arch-omap/mux.h b/include/asm-arm/arch-omap/mux.h
index b8fff50e6a87..0edc6ce91b33 100644
--- a/include/asm-arm/arch-omap/mux.h
+++ b/include/asm-arm/arch-omap/mux.h
@@ -559,11 +559,17 @@ enum omap24xx_index {
         B13_24XX_KBC6,
 };
 
+struct omap_mux_cfg {
+        struct pin_config       *pins;
+        unsigned long           size;
+        int                     (*cfg_reg)(const struct pin_config *cfg);
+};
+
 #ifdef  CONFIG_OMAP_MUX
 /* setup pin muxing in Linux */
 extern int omap1_mux_init(void);
 extern int omap2_mux_init(void);
-extern int omap_mux_register(struct pin_config * pins, unsigned long size);
+extern int omap_mux_register(struct omap_mux_cfg *);
 extern int omap_cfg_reg(unsigned long reg_cfg);
 #else
 /* boot loader does it all (no warnings from CONFIG_OMAP_MUX_WARNINGS) */