/* SPDX-License-Identifier: GPL-2.0 */ /* * gpio-au1300.h -- GPIO control for Au1300 GPIC and compatibles. * * Copyright (c) 2009-2011 Manuel Lauss <manuel.lauss@googlemail.com> */ #ifndef _GPIO_AU1300_H_ #define _GPIO_AU1300_H_ #include <asm/addrspace.h> #include <asm/io.h> #include <asm/mach-au1x00/au1000.h> struct gpio; struct gpio_chip; /* with the current GPIC design, up to 128 GPIOs are possible. * The only implementation so far is in the Au1300, which has 75 externally * available GPIOs. */ #define AU1300_GPIO_BASE 0 #define AU1300_GPIO_NUM 75 #define AU1300_GPIO_MAX (AU1300_GPIO_BASE + AU1300_GPIO_NUM - 1) #define AU1300_GPIC_ADDR \ (void __iomem *)KSEG1ADDR(AU1300_GPIC_PHYS_ADDR) static inline int au1300_gpio_get_value(unsigned int gpio) { void __iomem *roff = AU1300_GPIC_ADDR; int bit; gpio -= AU1300_GPIO_BASE; roff += GPIC_GPIO_BANKOFF(gpio); bit = GPIC_GPIO_TO_BIT(gpio); return __raw_readl(roff + AU1300_GPIC_PINVAL) & bit; } static inline int au1300_gpio_direction_input(unsigned int gpio) { void __iomem *roff = AU1300_GPIC_ADDR; unsigned long bit; gpio -= AU1300_GPIO_BASE; roff += GPIC_GPIO_BANKOFF(gpio); bit = GPIC_GPIO_TO_BIT(gpio); __raw_writel(bit, roff + AU1300_GPIC_DEVCLR); wmb(); return 0; } static inline int au1300_gpio_set_value(unsigned int gpio, int v) { void __iomem *roff = AU1300_GPIC_ADDR; unsigned long bit; gpio -= AU1300_GPIO_BASE; roff += GPIC_GPIO_BANKOFF(gpio); bit = GPIC_GPIO_TO_BIT(gpio); __raw_writel(bit, roff + (v ? AU1300_GPIC_PINVAL : AU1300_GPIC_PINVALCLR)); wmb(); return 0; } static inline int au1300_gpio_direction_output(unsigned int gpio, int v) { /* hw switches to output automatically */ return au1300_gpio_set_value(gpio, v); } static inline int au1300_gpio_to_irq(unsigned int gpio) { return AU1300_FIRST_INT + (gpio - AU1300_GPIO_BASE); } static inline int au1300_irq_to_gpio(unsigned int irq) { return (irq - AU1300_FIRST_INT) + AU1300_GPIO_BASE; } static inline int au1300_gpio_is_valid(unsigned int gpio) { int ret; switch (alchemy_get_cputype()) { case ALCHEMY_CPU_AU1300: ret = ((gpio >= AU1300_GPIO_BASE) && (gpio <= AU1300_GPIO_MAX)); break; default: ret = 0; } return ret; } /* hardware remembers gpio 0-63 levels on powerup */ static inline int au1300_gpio_getinitlvl(unsigned int gpio) { void __iomem *roff = AU1300_GPIC_ADDR; unsigned long v; if (unlikely(gpio > 63)) return 0; else if (gpio > 31) { gpio -= 32; roff += 4; } v = __raw_readl(roff + AU1300_GPIC_RSTVAL); return (v >> gpio) & 1; } #endif /* _GPIO_AU1300_H_ */