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[ARM] pxa: move common GPIO handling code into plat-pxa

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1. add common GPIO handling code into [arch/arm/plat-pxa]

2. common code in <mach/gpio.h> moved into <plat/gpio.h>, new processors
   should implement its own <mach/gpio.h>, provide the following required
   definitions and '#include <plat/gpio.h>' in the end:

   - GPIO_REGS_VIRT for mapped virtual address of the GPIO registers'
     physical I/O memory

   - macros of GPLR(), GPSR(), GPDR() for constant optimization for
     functions gpio_{set,get}_value() (so that bit-bang code can still
     have tolerable performance)

   - NR_BUILTIN_GPIO for the number of onchip GPIO

   - definitions of __gpio_is_inverted() and __gpio_is_occupied(), they
     can be either macros or inlined functions

Signed-off-by: Eric Miao <eric.miao@marvell.com>
This commit is contained in:
Eric Miao
2009-01-20 12:09:06 +08:00
parent bd5ce43323
commit 38f539a608
5 changed files with 66 additions and 61 deletions
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32
arch/arm/mach-pxa/include/mach/gpio.h
View File

@@ -99,40 +99,12 @@
#define GAFR(x) GPIO_REG(0x54 + (((x) & 0x70) >> 2))
/* NOTE: some PXAs have fewer on-chip GPIOs (like PXA255, with 85).
* Those cases currently cause holes in the GPIO number space, the
* actual number of the last GPIO is recorded by 'pxa_last_gpio'.
*/
extern int pxa_last_gpio;
#define NR_BUILTIN_GPIO 128
static inline int gpio_get_value(unsigned gpio)
{
if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO))
return GPLR(gpio) & GPIO_bit(gpio);
else
return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO)) {
if (value)
GPSR(gpio) = GPIO_bit(gpio);
else
GPCR(gpio) = GPIO_bit(gpio);
} else {
__gpio_set_value(gpio, value);
}
}
#define gpio_cansleep __gpio_cansleep
#define gpio_to_bank(gpio) ((gpio) >> 5)
#define gpio_to_irq(gpio) IRQ_GPIO(gpio)
#define irq_to_gpio(irq) IRQ_TO_GPIO(irq)
#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.
@@ -165,7 +137,5 @@ static inline int __gpio_is_occupied(unsigned gpio)
return GPDR(gpio) & GPIO_bit(gpio);
}
typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);
#include <plat/gpio.h>
#endif