diff options
Diffstat (limited to 'arch/mips/include/asm/mach-au1x00/gpio.h')
| -rw-r--r-- | arch/mips/include/asm/mach-au1x00/gpio.h | 79 |
1 files changed, 76 insertions, 3 deletions
diff --git a/arch/mips/include/asm/mach-au1x00/gpio.h b/arch/mips/include/asm/mach-au1x00/gpio.h index c3f60cdc320..fcdc8c4809d 100644 --- a/arch/mips/include/asm/mach-au1x00/gpio.h +++ b/arch/mips/include/asm/mach-au1x00/gpio.h @@ -1,10 +1,83 @@ +/* + * Alchemy GPIO support. + * + * With CONFIG_GPIOLIB=y different types of on-chip GPIO can be supported within + * the same kernel image. + * With CONFIG_GPIOLIB=n, your board must select ALCHEMY_GPIOINT_AU1XXX for the + * appropriate CPU type (AU1000 currently). + */ + #ifndef _ALCHEMY_GPIO_H_ #define _ALCHEMY_GPIO_H_ -#if defined(CONFIG_ALCHEMY_GPIOINT_AU1000) - +#include <asm/mach-au1x00/au1000.h> #include <asm/mach-au1x00/gpio-au1000.h> -#endif +/* On Au1000, Au1500 and Au1100 GPIOs won't work as inputs before + * SYS_PININPUTEN is written to at least once. On Au1550/Au1200/Au1300 this + * register enables use of GPIOs as wake source. + */ +static inline void alchemy_gpio1_input_enable(void) +{ + void __iomem *base = (void __iomem *)KSEG1ADDR(AU1000_SYS_PHYS_ADDR); + __raw_writel(0, base + 0x110); /* the write op is key */ + wmb(); +} + + +/* Linux gpio framework integration. +* +* 4 use cases of Alchemy GPIOS: +*(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y: +* Board must register gpiochips. +*(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n: +* A gpiochip for the 75 GPIOs is registered. +* +*(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y: +* the boards' gpio.h must provide the linux gpio wrapper functions, +* +*(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n: +* inlinable gpio functions are provided which enable access to the +* Au1300 gpios only by using the numbers straight out of the data- +* sheets. + +* Cases 1 and 3 are intended for boards which want to provide their own +* GPIO namespace and -operations (i.e. for example you have 8 GPIOs +* which are in part provided by spare Au1300 GPIO pins and in part by +* an external FPGA but you still want them to be accssible in linux +* as gpio0-7. The board can of course use the alchemy_gpioX_* functions +* as required). +*/ + +#ifdef CONFIG_GPIOLIB + +/* wraps the cpu-dependent irq_to_gpio functions */ +/* FIXME: gpiolib needs an irq_to_gpio hook */ +static inline int __au_irq_to_gpio(unsigned int irq) +{ + switch (alchemy_get_cputype()) { + case ALCHEMY_CPU_AU1000...ALCHEMY_CPU_AU1200: + return alchemy_irq_to_gpio(irq); + } + return -EINVAL; +} + + +/* using gpiolib to provide up to 2 gpio_chips for on-chip gpios */ +#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (2) */ + +/* get everything through gpiolib */ +#define gpio_to_irq __gpio_to_irq +#define gpio_get_value __gpio_get_value +#define gpio_set_value __gpio_set_value +#define gpio_cansleep __gpio_cansleep +#define irq_to_gpio __au_irq_to_gpio + +#include <asm-generic/gpio.h> + +#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */ + + +#endif /* CONFIG_GPIOLIB */ #endif /* _ALCHEMY_GPIO_H_ */ |