1 /* 2 * Alchemy GPIO support. 3 * 4 * With CONFIG_GPIOLIB=y different types of on-chip GPIO can be supported within 5 * the same kernel image. 6 * With CONFIG_GPIOLIB=n, your board must select ALCHEMY_GPIOINT_AU1XXX for the 7 * appropriate CPU type (AU1000 currently). 8 */ 9 10 #ifndef _ALCHEMY_GPIO_H_ 11 #define _ALCHEMY_GPIO_H_ 12 13 #include <asm/mach-au1x00/au1000.h> 14 #include <asm/mach-au1x00/gpio-au1000.h> 15 #include <asm/mach-au1x00/gpio-au1300.h> 16 17 /* On Au1000, Au1500 and Au1100 GPIOs won't work as inputs before 18 * SYS_PININPUTEN is written to at least once. On Au1550/Au1200/Au1300 this 19 * register enables use of GPIOs as wake source. 20 */ alchemy_gpio1_input_enable(void)21static inline void alchemy_gpio1_input_enable(void) 22 { 23 void __iomem *base = (void __iomem *)KSEG1ADDR(AU1000_SYS_PHYS_ADDR); 24 __raw_writel(0, base + 0x110); /* the write op is key */ 25 wmb(); 26 } 27 28 29 /* Linux gpio framework integration. 30 * 31 * 4 use cases of Alchemy GPIOS: 32 *(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y: 33 * Board must register gpiochips. 34 *(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n: 35 * A gpiochip for the 75 GPIOs is registered. 36 * 37 *(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y: 38 * the boards' gpio.h must provide the linux gpio wrapper functions, 39 * 40 *(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n: 41 * inlinable gpio functions are provided which enable access to the 42 * Au1300 gpios only by using the numbers straight out of the data- 43 * sheets. 44 45 * Cases 1 and 3 are intended for boards which want to provide their own 46 * GPIO namespace and -operations (i.e. for example you have 8 GPIOs 47 * which are in part provided by spare Au1300 GPIO pins and in part by 48 * an external FPGA but you still want them to be accssible in linux 49 * as gpio0-7. The board can of course use the alchemy_gpioX_* functions 50 * as required). 51 */ 52 53 #ifdef CONFIG_GPIOLIB 54 55 /* wraps the cpu-dependent irq_to_gpio functions */ 56 /* FIXME: gpiolib needs an irq_to_gpio hook */ __au_irq_to_gpio(unsigned int irq)57static inline int __au_irq_to_gpio(unsigned int irq) 58 { 59 switch (alchemy_get_cputype()) { 60 case ALCHEMY_CPU_AU1000...ALCHEMY_CPU_AU1200: 61 return alchemy_irq_to_gpio(irq); 62 case ALCHEMY_CPU_AU1300: 63 return au1300_irq_to_gpio(irq); 64 } 65 return -EINVAL; 66 } 67 68 69 /* using gpiolib to provide up to 2 gpio_chips for on-chip gpios */ 70 #ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (2) */ 71 72 /* get everything through gpiolib */ 73 #define gpio_to_irq __gpio_to_irq 74 #define gpio_get_value __gpio_get_value 75 #define gpio_set_value __gpio_set_value 76 #define gpio_cansleep __gpio_cansleep 77 #define irq_to_gpio __au_irq_to_gpio 78 79 #include <asm-generic/gpio.h> 80 81 #endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */ 82 83 84 #endif /* CONFIG_GPIOLIB */ 85 86 #endif /* _ALCHEMY_GPIO_H_ */ 87