diff options
author | Eric Miao <eric.miao@marvell.com> | 2009-01-20 04:09:06 (GMT) |
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committer | Eric Miao <eric.miao@marvell.com> | 2009-03-23 02:11:33 (GMT) |
commit | 38f539a608c9a3b40b30f1892bd5f9a38f4e5ffe (patch) | |
tree | feb9c3ee23fe75151f73e8916c1afeb7c562e0dd /arch/arm/plat-pxa/include | |
parent | bd5ce4332328c1fe473690a86b2e6a4157be038f (diff) | |
download | linux-38f539a608c9a3b40b30f1892bd5f9a38f4e5ffe.tar.xz |
[ARM] pxa: move common GPIO handling code into plat-pxa
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>
Diffstat (limited to 'arch/arm/plat-pxa/include')
-rw-r--r-- | arch/arm/plat-pxa/include/plat/gpio.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/arm/plat-pxa/include/plat/gpio.h b/arch/arm/plat-pxa/include/plat/gpio.h new file mode 100644 index 0000000..44248cb --- /dev/null +++ b/arch/arm/plat-pxa/include/plat/gpio.h @@ -0,0 +1,62 @@ +#ifndef __PLAT_GPIO_H +#define __PLAT_GPIO_H + +/* + * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with + * one set of registers. The register offsets are organized below: + * + * GPLR GPDR GPSR GPCR GRER GFER GEDR + * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048 + * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C + * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050 + * + * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148 + * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C + * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150 + * + * NOTE: + * BANK 3 is only available on PXA27x and later processors. + * BANK 4 and 5 are only available on PXA935 + */ + +#define GPIO_BANK(n) (GPIO_REGS_VIRT + BANK_OFF(n)) + +#define GPLR_OFFSET 0x00 +#define GPDR_OFFSET 0x0C +#define GPSR_OFFSET 0x18 +#define GPCR_OFFSET 0x24 +#define GRER_OFFSET 0x30 +#define GFER_OFFSET 0x3C +#define GEDR_OFFSET 0x48 + +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 + +/* 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; + +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); +#endif /* __PLAT_GPIO_H */ |