[ARM] 4559/1: pxa: make PXA_LAST_GPIO a run-time variable

This definition produces processor specific code in generic function
pxa_gpio_mode(), thus creating inconsistencies for support of pxa25x
and pxa27x in a single zImage.

As David Brownell suggests, make it a run-time variable and initialize
at run-time according to the number of GPIOs on the processor. For now
the initialization happens in pxa_init_irq_gpio(),  since there is
already a parameter for that, besides, this is and MUST be earlier
than any subsequent calls to pxa_gpio_mode().

Signed-off-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 1c5413fc6e74..eed95eaf58cd 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -71,6 +71,7 @@ EXPORT_SYMBOL(get_memclk_frequency_10khz);
 /*
  * Handy function to set GPIO alternate functions
  */
+int pxa_last_gpio;
 
 int pxa_gpio_mode(int gpio_mode)
 {
@@ -79,7 +80,7 @@ int pxa_gpio_mode(int gpio_mode)
         int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
         int gafr;
 
-        if (gpio > PXA_LAST_GPIO)
+        if (gpio > pxa_last_gpio)
                 return -EINVAL;
 
         local_irq_save(flags);
diff --git a/arch/arm/mach-pxa/generic.h b/arch/arm/mach-pxa/generic.h
index 5b11741cccff..25bd9bf727b6 100644
--- a/arch/arm/mach-pxa/generic.h
+++ b/arch/arm/mach-pxa/generic.h
@@ -20,6 +20,7 @@ extern void __init pxa27x_init_irq(void);
 extern void __init pxa_map_io(void);
 
 extern unsigned int get_clk_frequency_khz(int info);
+extern int pxa_last_gpio;
 
 #define SET_BANK(__nr,__start,__size) \
         mi->bank[__nr].start = (__start), \
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index ae2ae08032d7..3d95442d4168 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -349,6 +349,8 @@ void __init pxa_init_irq_gpio(int gpio_nr)
 {
         int irq, i;
 
+        pxa_last_gpio = gpio_nr - 1;
+
         /* clear all GPIO edge detects */
         for (i = 0; i < gpio_nr; i += 32) {
                 GFER(i) = 0;