2 * arch/arm/mach-pxa/include/mach/gpio.h
4 * PXA GPIO wrappers for arch-neutral GPIO calls
6 * Written by Philipp Zabel <philipp.zabel@gmail.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #ifndef __ASM_ARCH_PXA_GPIO_H
25 #define __ASM_ARCH_PXA_GPIO_H
27 #include <mach/pxa-regs.h>
29 #include <mach/hardware.h>
31 #include <asm-generic/gpio.h>
34 /* NOTE: some PXAs have fewer on-chip GPIOs (like PXA255, with 85).
35 * Those cases currently cause holes in the GPIO number space.
37 #define NR_BUILTIN_GPIO 128
39 static inline int gpio_get_value(unsigned gpio)
41 if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO))
42 return GPLR(gpio) & GPIO_bit(gpio);
44 return __gpio_get_value(gpio);
47 static inline void gpio_set_value(unsigned gpio, int value)
49 if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO)) {
51 GPSR(gpio) = GPIO_bit(gpio);
53 GPCR(gpio) = GPIO_bit(gpio);
55 __gpio_set_value(gpio, value);
59 #define gpio_cansleep __gpio_cansleep
60 #define gpio_to_irq(gpio) IRQ_GPIO(gpio)
61 #define irq_to_gpio(irq) IRQ_TO_GPIO(irq)
64 #ifdef CONFIG_CPU_PXA26x
65 /* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
66 * as well as their Alternate Function value being '1' for GPIO in GAFRx.
68 static inline int __gpio_is_inverted(unsigned gpio)
70 return cpu_is_pxa25x() && gpio > 85;
73 static inline int __gpio_is_inverted(unsigned gpio) { return 0; }
77 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
78 * function of a GPIO, and GPDRx cannot be altered once configured. It
79 * is attributed as "occupied" here (I know this terminology isn't
80 * accurate, you are welcome to propose a better one :-)
82 static inline int __gpio_is_occupied(unsigned gpio)
84 if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
85 int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
86 int dir = GPDR(gpio) & GPIO_bit(gpio);
88 if (__gpio_is_inverted(gpio))
89 return af != 1 || dir == 0;
91 return af != 0 || dir != 0;
93 return GPDR(gpio) & GPIO_bit(gpio);
96 typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
98 extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);