[ARM] pxa: move IRQ handling of GPIO 0 and 1 outside of gpio.c

This is part of the work making gpio.c generic enough, the changes
include:

1. move IRQ handling of GPIO 0 and 1 outside (and back into irq.c)

2. pxa_init_gpio() accepts a range for muxed GPIO IRQs, and an IRQ
   number for the muxed GPIOs

3. __gpio_is_occupied() and __gpio_is_inverted() are made inline,
   and are moved into <mach/gpio.h> instead of generic gpio.c

Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 25 insertions, 88 deletions

diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
index 5fec1e479cb..19824601902 100644
--- a/arch/arm/mach-pxa/gpio.c
+++ b/arch/arm/mach-pxa/gpio.c
@@ -45,18 +45,6 @@ struct pxa_gpio_chip {
 
 int pxa_last_gpio;
 
-#ifdef CONFIG_CPU_PXA26x
-/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
- * as well as their Alternate Function value being '1' for GPIO in GAFRx.
- */
-static int __gpio_is_inverted(unsigned gpio)
-{
-        return cpu_is_pxa25x() && gpio > 85;
-}
-#else
-#define __gpio_is_inverted(gpio)        (0)
-#endif
-
 /*
  * Configure pins for GPIO or other functions
  */
@@ -185,6 +173,20 @@ static struct pxa_gpio_chip pxa_gpio_chip[] = {
 #endif
 };
 
+static void __init pxa_init_gpio_chip(int gpio_nr)
+{
+        int i, gpio;
+
+        /* add a GPIO chip for each register bank.
+         * the last PXA25x register only contains 21 GPIOs
+         */
+        for (gpio = 0, i = 0; gpio < gpio_nr; gpio += 32, i++) {
+                if (gpio + 32 > gpio_nr)
+                        pxa_gpio_chip[i].chip.ngpio = gpio_nr - gpio;
+                gpiochip_add(&pxa_gpio_chip[i].chip);
+        }
+}
+
 /*
  * PXA GPIO edge detection for IRQs:
  * IRQs are generated on Falling-Edge, Rising-Edge, or both.
@@ -195,27 +197,6 @@ static unsigned long GPIO_IRQ_rising_edge[4];
 static unsigned long GPIO_IRQ_falling_edge[4];
 static unsigned long GPIO_IRQ_mask[4];
 
-/*
- * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
- * function of a GPIO, and GPDRx cannot be altered once configured. It
- * is attributed as "occupied" here (I know this terminology isn't
- * accurate, you are welcome to propose a better one :-)
- */
-static int __gpio_is_occupied(unsigned gpio)
-{
-        if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
-                int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
-                int dir = GPDR(gpio) & GPIO_bit(gpio);
-
-                if (__gpio_is_inverted(gpio))
-                        return af != 1 || dir == 0;
-                else
-                        return af != 0 || dir != 0;
-        }
-
-        return 0;
-}
-
 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 {
         int gpio, idx;
@@ -262,33 +243,6 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 }
 
 /*
- * GPIO IRQs must be acknowledged.  This is for GPIO 0 and 1.
- */
-
-static void pxa_ack_low_gpio(unsigned int irq)
-{
-        GEDR0 = (1 << (irq - IRQ_GPIO0));
-}
-
-static void pxa_mask_low_gpio(unsigned int irq)
-{
-        ICMR &= ~(1 << (irq - PXA_IRQ(0)));
-}
-
-static void pxa_unmask_low_gpio(unsigned int irq)
-{
-        ICMR |= 1 << (irq - PXA_IRQ(0));
-}
-
-static struct irq_chip pxa_low_gpio_chip = {
-        .name           = "GPIO-l",
-        .ack            = pxa_ack_low_gpio,
-        .mask           = pxa_mask_low_gpio,
-        .unmask         = pxa_unmask_low_gpio,
-        .set_type       = pxa_gpio_irq_type,
-};
-
-/*
  * Demux handler for GPIO>=2 edge detect interrupts
  */
 
@@ -352,48 +306,31 @@ static struct irq_chip pxa_muxed_gpio_chip = {
         .set_type       = pxa_gpio_irq_type,
 };
 
-void __init pxa_init_gpio(int gpio_nr, set_wake_t fn)
+void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
 {
-        int irq, i, gpio;
+        int irq, i;
 
-        pxa_last_gpio = gpio_nr - 1;
+        pxa_last_gpio = end;
 
         /* clear all GPIO edge detects */
-        for (i = 0; i < gpio_nr; i += 32) {
-                GFER(i) = 0;
-                GRER(i) = 0;
-                GEDR(i) = GEDR(i);
+        for (i = start; i <= end; i += 32) {
+                GFER(i) &= ~GPIO_IRQ_mask[i];
+                GRER(i) &= ~GPIO_IRQ_mask[i];
+                GEDR(i) = GPIO_IRQ_mask[i];
         }
 
-        /* GPIO 0 and 1 must have their mask bit always set */
-        GPIO_IRQ_mask[0] = 3;
-
-        for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
-                set_irq_chip(irq, &pxa_low_gpio_chip);
-                set_irq_handler(irq, handle_edge_irq);
-                set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-        }
-
-        for (irq = IRQ_GPIO(2); irq < IRQ_GPIO(gpio_nr); irq++) {
+        for (irq  = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
                 set_irq_chip(irq, &pxa_muxed_gpio_chip);
                 set_irq_handler(irq, handle_edge_irq);
                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
         }
 
         /* Install handler for GPIO>=2 edge detect interrupts */
-        set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
-
-        pxa_low_gpio_chip.set_wake = fn;
+        set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler);
         pxa_muxed_gpio_chip.set_wake = fn;
 
-        /* add a GPIO chip for each register bank.
-         * the last PXA25x register only contains 21 GPIOs
-         */
-        for (gpio = 0, i = 0; gpio < gpio_nr; gpio += 32, i++) {
-                if (gpio + 32 > gpio_nr)
-                        pxa_gpio_chip[i].chip.ngpio = gpio_nr - gpio;
-                gpiochip_add(&pxa_gpio_chip[i].chip);
-        }
+        /* Initialize GPIO chips */
+        pxa_init_gpio_chip(end + 1);
 }
 
 #ifdef CONFIG_PM