From 38f539a608c9a3b40b30f1892bd5f9a38f4e5ffe Mon Sep 17 00:00:00 2001 From: Eric Miao Date: Tue, 20 Jan 2009 12:09:06 +0800 Subject: [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 moved into , new processors should implement its own , provide the following required definitions and '#include ' 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 diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile index 70b4657..c80e1ba 100644 --- a/arch/arm/mach-pxa/Makefile +++ b/arch/arm/mach-pxa/Makefile @@ -4,7 +4,7 @@ # Common support (must be linked before board specific support) obj-y += clock.o devices.o generic.o irq.o \ - time.o gpio.o reset.o + time.o reset.o obj-$(CONFIG_PM) += pm.o sleep.o standby.o ifeq ($(CONFIG_CPU_FREQ),y) diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c deleted file mode 100644 index 7c22670..0000000 --- a/arch/arm/mach-pxa/gpio.c +++ /dev/null @@ -1,365 +0,0 @@ -/* - * linux/arch/arm/mach-pxa/gpio.c - * - * Generic PXA GPIO handling - * - * Author: Nicolas Pitre - * Created: Jun 15, 2001 - * Copyright: MontaVista Software Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include -#include -#include -#include -#include - -#include - -int pxa_last_gpio; - -/* - * 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 - -struct pxa_gpio_chip { - struct gpio_chip chip; - void __iomem *regbase; - char label[10]; - - unsigned long irq_mask; - unsigned long irq_edge_rise; - unsigned long irq_edge_fall; - -#ifdef CONFIG_PM - unsigned long saved_gplr; - unsigned long saved_gpdr; - unsigned long saved_grer; - unsigned long saved_gfer; -#endif -}; - -static DEFINE_SPINLOCK(gpio_lock); -static struct pxa_gpio_chip *pxa_gpio_chips; - -#define for_each_gpio_chip(i, c) \ - for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++) - -static inline void __iomem *gpio_chip_base(struct gpio_chip *c) -{ - return container_of(c, struct pxa_gpio_chip, chip)->regbase; -} - -static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio) -{ - return &pxa_gpio_chips[gpio_to_bank(gpio)]; -} - -static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset) -{ - void __iomem *base = gpio_chip_base(chip); - uint32_t value, mask = 1 << offset; - unsigned long flags; - - spin_lock_irqsave(&gpio_lock, flags); - - value = __raw_readl(base + GPDR_OFFSET); - if (__gpio_is_inverted(chip->base + offset)) - value |= mask; - else - value &= ~mask; - __raw_writel(value, base + GPDR_OFFSET); - - spin_unlock_irqrestore(&gpio_lock, flags); - return 0; -} - -static int pxa_gpio_direction_output(struct gpio_chip *chip, - unsigned offset, int value) -{ - void __iomem *base = gpio_chip_base(chip); - uint32_t tmp, mask = 1 << offset; - unsigned long flags; - - __raw_writel(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET)); - - spin_lock_irqsave(&gpio_lock, flags); - - tmp = __raw_readl(base + GPDR_OFFSET); - if (__gpio_is_inverted(chip->base + offset)) - tmp &= ~mask; - else - tmp |= mask; - __raw_writel(tmp, base + GPDR_OFFSET); - - spin_unlock_irqrestore(&gpio_lock, flags); - return 0; -} - -static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset) -{ - return __raw_readl(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset); -} - -static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value) -{ - __raw_writel(1 << offset, gpio_chip_base(chip) + - (value ? GPSR_OFFSET : GPCR_OFFSET)); -} - -static int __init pxa_init_gpio_chip(int gpio_end) -{ - int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1; - struct pxa_gpio_chip *chips; - - /* this is early, we have to use bootmem allocator, and we really - * want this to be allocated dynamically for different 'gpio_end' - */ - chips = alloc_bootmem_low(nbanks * sizeof(struct pxa_gpio_chip)); - if (chips == NULL) { - pr_err("%s: failed to allocate GPIO chips\n", __func__); - return -ENOMEM; - } - - for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) { - struct gpio_chip *c = &chips[i].chip; - - sprintf(chips[i].label, "gpio-%d", i); - chips[i].regbase = (void __iomem *)GPIO_BANK(i); - - c->base = gpio; - c->label = chips[i].label; - - c->direction_input = pxa_gpio_direction_input; - c->direction_output = pxa_gpio_direction_output; - c->get = pxa_gpio_get; - c->set = pxa_gpio_set; - - /* number of GPIOs on last bank may be less than 32 */ - c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32; - gpiochip_add(c); - } - pxa_gpio_chips = chips; - return 0; -} - -static int pxa_gpio_irq_type(unsigned int irq, unsigned int type) -{ - struct pxa_gpio_chip *c; - int gpio = irq_to_gpio(irq); - unsigned long gpdr, mask = GPIO_bit(gpio); - - c = gpio_to_chip(gpio); - - if (type == IRQ_TYPE_PROBE) { - /* Don't mess with enabled GPIOs using preconfigured edges or - * GPIOs set to alternate function or to output during probe - */ - if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio)) - return 0; - - if (__gpio_is_occupied(gpio)) - return 0; - - type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; - } - - gpdr = __raw_readl(c->regbase + GPDR_OFFSET); - - if (__gpio_is_inverted(gpio)) - __raw_writel(gpdr | mask, c->regbase + GPDR_OFFSET); - else - __raw_writel(gpdr & ~mask, c->regbase + GPDR_OFFSET); - - if (type & IRQ_TYPE_EDGE_RISING) - c->irq_edge_rise |= mask; - else - c->irq_edge_rise &= ~mask; - - if (type & IRQ_TYPE_EDGE_FALLING) - c->irq_edge_fall |= mask; - else - c->irq_edge_fall &= ~mask; - - __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET); - __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET); - - pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio, - ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""), - ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : "")); - return 0; -} - -static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc) -{ - struct pxa_gpio_chip *c; - int loop, gpio, gpio_base, n; - unsigned long gedr; - - do { - loop = 0; - for_each_gpio_chip(gpio, c) { - gpio_base = c->chip.base; - - gedr = __raw_readl(c->regbase + GEDR_OFFSET); - gedr = gedr & c->irq_mask; - __raw_writel(gedr, c->regbase + GEDR_OFFSET); - - n = find_first_bit(&gedr, BITS_PER_LONG); - while (n < BITS_PER_LONG) { - loop = 1; - - generic_handle_irq(gpio_to_irq(gpio_base + n)); - n = find_next_bit(&gedr, BITS_PER_LONG, n + 1); - } - } - } while (loop); -} - -static void pxa_ack_muxed_gpio(unsigned int irq) -{ - int gpio = irq_to_gpio(irq); - struct pxa_gpio_chip *c = gpio_to_chip(gpio); - - __raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET); -} - -static void pxa_mask_muxed_gpio(unsigned int irq) -{ - int gpio = irq_to_gpio(irq); - struct pxa_gpio_chip *c = gpio_to_chip(gpio); - uint32_t grer, gfer; - - c->irq_mask &= ~GPIO_bit(gpio); - - grer = __raw_readl(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio); - gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio); - __raw_writel(grer, c->regbase + GRER_OFFSET); - __raw_writel(gfer, c->regbase + GFER_OFFSET); -} - -static void pxa_unmask_muxed_gpio(unsigned int irq) -{ - int gpio = irq_to_gpio(irq); - struct pxa_gpio_chip *c = gpio_to_chip(gpio); - - c->irq_mask |= GPIO_bit(gpio); - __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET); - __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET); -} - -static struct irq_chip pxa_muxed_gpio_chip = { - .name = "GPIO", - .ack = pxa_ack_muxed_gpio, - .mask = pxa_mask_muxed_gpio, - .unmask = pxa_unmask_muxed_gpio, - .set_type = pxa_gpio_irq_type, -}; - -void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn) -{ - struct pxa_gpio_chip *c; - int gpio, irq; - - pxa_last_gpio = end; - - /* Initialize GPIO chips */ - pxa_init_gpio_chip(end); - - /* clear all GPIO edge detects */ - for_each_gpio_chip(gpio, c) { - __raw_writel(0, c->regbase + GFER_OFFSET); - __raw_writel(0, c->regbase + GRER_OFFSET); - __raw_writel(~0,c->regbase + GEDR_OFFSET); - } - - for (irq = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) { - set_irq_chip(irq, &pxa_muxed_gpio_chip); - set_irq_handler(irq, handle_edge_irq); - set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); - } - - /* Install handler for GPIO>=2 edge detect interrupts */ - set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler); - pxa_muxed_gpio_chip.set_wake = fn; -} - -#ifdef CONFIG_PM -static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state) -{ - struct pxa_gpio_chip *c; - int gpio; - - for_each_gpio_chip(gpio, c) { - c->saved_gplr = __raw_readl(c->regbase + GPLR_OFFSET); - c->saved_gpdr = __raw_readl(c->regbase + GPDR_OFFSET); - c->saved_grer = __raw_readl(c->regbase + GRER_OFFSET); - c->saved_gfer = __raw_readl(c->regbase + GFER_OFFSET); - - /* Clear GPIO transition detect bits */ - __raw_writel(0xffffffff, c->regbase + GEDR_OFFSET); - } - return 0; -} - -static int pxa_gpio_resume(struct sys_device *dev) -{ - struct pxa_gpio_chip *c; - int gpio; - - for_each_gpio_chip(gpio, c) { - /* restore level with set/clear */ - __raw_writel( c->saved_gplr, c->regbase + GPSR_OFFSET); - __raw_writel(~c->saved_gplr, c->regbase + GPCR_OFFSET); - - __raw_writel(c->saved_grer, c->regbase + GRER_OFFSET); - __raw_writel(c->saved_gfer, c->regbase + GFER_OFFSET); - __raw_writel(c->saved_gpdr, c->regbase + GPDR_OFFSET); - } - return 0; -} -#else -#define pxa_gpio_suspend NULL -#define pxa_gpio_resume NULL -#endif - -struct sysdev_class pxa_gpio_sysclass = { - .name = "gpio", - .suspend = pxa_gpio_suspend, - .resume = pxa_gpio_resume, -}; - -static int __init pxa_gpio_init(void) -{ - return sysdev_class_register(&pxa_gpio_sysclass); -} - -core_initcall(pxa_gpio_init); diff --git a/arch/arm/mach-pxa/include/mach/gpio.h b/arch/arm/mach-pxa/include/mach/gpio.h index c72c89a..b024a8b 100644 --- a/arch/arm/mach-pxa/include/mach/gpio.h +++ b/arch/arm/mach-pxa/include/mach/gpio.h @@ -99,40 +99,12 @@ #define GAFR(x) GPIO_REG(0x54 + (((x) & 0x70) >> 2)) -/* 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; - #define NR_BUILTIN_GPIO 128 -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 #define gpio_to_bank(gpio) ((gpio) >> 5) #define gpio_to_irq(gpio) IRQ_GPIO(gpio) #define irq_to_gpio(irq) IRQ_TO_GPIO(irq) - #ifdef CONFIG_CPU_PXA26x /* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted, * as well as their Alternate Function value being '1' for GPIO in GAFRx. @@ -165,7 +137,5 @@ static inline int __gpio_is_occupied(unsigned gpio) return GPDR(gpio) & GPIO_bit(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); +#include #endif diff --git a/arch/arm/plat-pxa/Makefile b/arch/arm/plat-pxa/Makefile index dcc3cea..b837df4 100644 --- a/arch/arm/plat-pxa/Makefile +++ b/arch/arm/plat-pxa/Makefile @@ -4,3 +4,4 @@ obj-y := dma.o +obj-$(CONFIG_GENERIC_GPIO) += gpio.o diff --git a/arch/arm/plat-pxa/gpio.c b/arch/arm/plat-pxa/gpio.c new file mode 100644 index 0000000..af819bf --- /dev/null +++ b/arch/arm/plat-pxa/gpio.c @@ -0,0 +1,337 @@ +/* + * linux/arch/arm/plat-pxa/gpio.c + * + * Generic PXA GPIO handling + * + * Author: Nicolas Pitre + * Created: Jun 15, 2001 + * Copyright: MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include + +#include + +int pxa_last_gpio; + +struct pxa_gpio_chip { + struct gpio_chip chip; + void __iomem *regbase; + char label[10]; + + unsigned long irq_mask; + unsigned long irq_edge_rise; + unsigned long irq_edge_fall; + +#ifdef CONFIG_PM + unsigned long saved_gplr; + unsigned long saved_gpdr; + unsigned long saved_grer; + unsigned long saved_gfer; +#endif +}; + +static DEFINE_SPINLOCK(gpio_lock); +static struct pxa_gpio_chip *pxa_gpio_chips; + +#define for_each_gpio_chip(i, c) \ + for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++) + +static inline void __iomem *gpio_chip_base(struct gpio_chip *c) +{ + return container_of(c, struct pxa_gpio_chip, chip)->regbase; +} + +static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio) +{ + return &pxa_gpio_chips[gpio_to_bank(gpio)]; +} + +static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + void __iomem *base = gpio_chip_base(chip); + uint32_t value, mask = 1 << offset; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + value = __raw_readl(base + GPDR_OFFSET); + if (__gpio_is_inverted(chip->base + offset)) + value |= mask; + else + value &= ~mask; + __raw_writel(value, base + GPDR_OFFSET); + + spin_unlock_irqrestore(&gpio_lock, flags); + return 0; +} + +static int pxa_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + void __iomem *base = gpio_chip_base(chip); + uint32_t tmp, mask = 1 << offset; + unsigned long flags; + + __raw_writel(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET)); + + spin_lock_irqsave(&gpio_lock, flags); + + tmp = __raw_readl(base + GPDR_OFFSET); + if (__gpio_is_inverted(chip->base + offset)) + tmp &= ~mask; + else + tmp |= mask; + __raw_writel(tmp, base + GPDR_OFFSET); + + spin_unlock_irqrestore(&gpio_lock, flags); + return 0; +} + +static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + return __raw_readl(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset); +} + +static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + __raw_writel(1 << offset, gpio_chip_base(chip) + + (value ? GPSR_OFFSET : GPCR_OFFSET)); +} + +static int __init pxa_init_gpio_chip(int gpio_end) +{ + int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1; + struct pxa_gpio_chip *chips; + + /* this is early, we have to use bootmem allocator, and we really + * want this to be allocated dynamically for different 'gpio_end' + */ + chips = alloc_bootmem_low(nbanks * sizeof(struct pxa_gpio_chip)); + if (chips == NULL) { + pr_err("%s: failed to allocate GPIO chips\n", __func__); + return -ENOMEM; + } + + for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) { + struct gpio_chip *c = &chips[i].chip; + + sprintf(chips[i].label, "gpio-%d", i); + chips[i].regbase = (void __iomem *)GPIO_BANK(i); + + c->base = gpio; + c->label = chips[i].label; + + c->direction_input = pxa_gpio_direction_input; + c->direction_output = pxa_gpio_direction_output; + c->get = pxa_gpio_get; + c->set = pxa_gpio_set; + + /* number of GPIOs on last bank may be less than 32 */ + c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32; + gpiochip_add(c); + } + pxa_gpio_chips = chips; + return 0; +} + +static int pxa_gpio_irq_type(unsigned int irq, unsigned int type) +{ + struct pxa_gpio_chip *c; + int gpio = irq_to_gpio(irq); + unsigned long gpdr, mask = GPIO_bit(gpio); + + c = gpio_to_chip(gpio); + + if (type == IRQ_TYPE_PROBE) { + /* Don't mess with enabled GPIOs using preconfigured edges or + * GPIOs set to alternate function or to output during probe + */ + if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio)) + return 0; + + if (__gpio_is_occupied(gpio)) + return 0; + + type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; + } + + gpdr = __raw_readl(c->regbase + GPDR_OFFSET); + + if (__gpio_is_inverted(gpio)) + __raw_writel(gpdr | mask, c->regbase + GPDR_OFFSET); + else + __raw_writel(gpdr & ~mask, c->regbase + GPDR_OFFSET); + + if (type & IRQ_TYPE_EDGE_RISING) + c->irq_edge_rise |= mask; + else + c->irq_edge_rise &= ~mask; + + if (type & IRQ_TYPE_EDGE_FALLING) + c->irq_edge_fall |= mask; + else + c->irq_edge_fall &= ~mask; + + __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET); + __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET); + + pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio, + ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""), + ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : "")); + return 0; +} + +static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc) +{ + struct pxa_gpio_chip *c; + int loop, gpio, gpio_base, n; + unsigned long gedr; + + do { + loop = 0; + for_each_gpio_chip(gpio, c) { + gpio_base = c->chip.base; + + gedr = __raw_readl(c->regbase + GEDR_OFFSET); + gedr = gedr & c->irq_mask; + __raw_writel(gedr, c->regbase + GEDR_OFFSET); + + n = find_first_bit(&gedr, BITS_PER_LONG); + while (n < BITS_PER_LONG) { + loop = 1; + + generic_handle_irq(gpio_to_irq(gpio_base + n)); + n = find_next_bit(&gedr, BITS_PER_LONG, n + 1); + } + } + } while (loop); +} + +static void pxa_ack_muxed_gpio(unsigned int irq) +{ + int gpio = irq_to_gpio(irq); + struct pxa_gpio_chip *c = gpio_to_chip(gpio); + + __raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET); +} + +static void pxa_mask_muxed_gpio(unsigned int irq) +{ + int gpio = irq_to_gpio(irq); + struct pxa_gpio_chip *c = gpio_to_chip(gpio); + uint32_t grer, gfer; + + c->irq_mask &= ~GPIO_bit(gpio); + + grer = __raw_readl(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio); + gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio); + __raw_writel(grer, c->regbase + GRER_OFFSET); + __raw_writel(gfer, c->regbase + GFER_OFFSET); +} + +static void pxa_unmask_muxed_gpio(unsigned int irq) +{ + int gpio = irq_to_gpio(irq); + struct pxa_gpio_chip *c = gpio_to_chip(gpio); + + c->irq_mask |= GPIO_bit(gpio); + __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET); + __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET); +} + +static struct irq_chip pxa_muxed_gpio_chip = { + .name = "GPIO", + .ack = pxa_ack_muxed_gpio, + .mask = pxa_mask_muxed_gpio, + .unmask = pxa_unmask_muxed_gpio, + .set_type = pxa_gpio_irq_type, +}; + +void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn) +{ + struct pxa_gpio_chip *c; + int gpio, irq; + + pxa_last_gpio = end; + + /* Initialize GPIO chips */ + pxa_init_gpio_chip(end); + + /* clear all GPIO edge detects */ + for_each_gpio_chip(gpio, c) { + __raw_writel(0, c->regbase + GFER_OFFSET); + __raw_writel(0, c->regbase + GRER_OFFSET); + __raw_writel(~0,c->regbase + GEDR_OFFSET); + } + + for (irq = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) { + set_irq_chip(irq, &pxa_muxed_gpio_chip); + set_irq_handler(irq, handle_edge_irq); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + } + + /* Install handler for GPIO>=2 edge detect interrupts */ + set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler); + pxa_muxed_gpio_chip.set_wake = fn; +} + +#ifdef CONFIG_PM +static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state) +{ + struct pxa_gpio_chip *c; + int gpio; + + for_each_gpio_chip(gpio, c) { + c->saved_gplr = __raw_readl(c->regbase + GPLR_OFFSET); + c->saved_gpdr = __raw_readl(c->regbase + GPDR_OFFSET); + c->saved_grer = __raw_readl(c->regbase + GRER_OFFSET); + c->saved_gfer = __raw_readl(c->regbase + GFER_OFFSET); + + /* Clear GPIO transition detect bits */ + __raw_writel(0xffffffff, c->regbase + GEDR_OFFSET); + } + return 0; +} + +static int pxa_gpio_resume(struct sys_device *dev) +{ + struct pxa_gpio_chip *c; + int gpio; + + for_each_gpio_chip(gpio, c) { + /* restore level with set/clear */ + __raw_writel( c->saved_gplr, c->regbase + GPSR_OFFSET); + __raw_writel(~c->saved_gplr, c->regbase + GPCR_OFFSET); + + __raw_writel(c->saved_grer, c->regbase + GRER_OFFSET); + __raw_writel(c->saved_gfer, c->regbase + GFER_OFFSET); + __raw_writel(c->saved_gpdr, c->regbase + GPDR_OFFSET); + } + return 0; +} +#else +#define pxa_gpio_suspend NULL +#define pxa_gpio_resume NULL +#endif + +struct sysdev_class pxa_gpio_sysclass = { + .name = "gpio", + .suspend = pxa_gpio_suspend, + .resume = pxa_gpio_resume, +}; + +static int __init pxa_gpio_init(void) +{ + return sysdev_class_register(&pxa_gpio_sysclass); +} + +core_initcall(pxa_gpio_init); 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 */ -- cgit v0.10.2