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author | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 22:44:18 +0100 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 22:44:18 +0100 |
commit | 43872fa788060eef91ae437957e0a5e39f1c56fd (patch) | |
tree | dba464da61167d84b4f7470edebd5a769a78f9ee /arch/arm/plat-pxa/gpio.c | |
parent | Merge branch 'pxa/fixes' into next/fixes (diff) | |
parent | ARM: 7104/1: plat-pxa: break out GPIO driver specifics (diff) | |
download | linux-43872fa788060eef91ae437957e0a5e39f1c56fd.tar.xz linux-43872fa788060eef91ae437957e0a5e39f1c56fd.zip |
Merge branch 'depends/rmk/gpio' into next/fixes
This sorts out merge conflicts with the arm/gpio branch that
already got merged into mainline Linux.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/plat-pxa/gpio.c')
-rw-r--r-- | arch/arm/plat-pxa/gpio.c | 338 |
1 files changed, 0 insertions, 338 deletions
diff --git a/arch/arm/plat-pxa/gpio.c b/arch/arm/plat-pxa/gpio.c deleted file mode 100644 index 0db7615c2cf0..000000000000 --- a/arch/arm/plat-pxa/gpio.c +++ /dev/null @@ -1,338 +0,0 @@ -/* - * 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 <linux/init.h> -#include <linux/irq.h> -#include <linux/io.h> -#include <linux/syscore_ops.h> -#include <linux/slab.h> - -#include <mach/gpio.h> - -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_pxachip(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; - - chips = kzalloc(nbanks * sizeof(struct pxa_gpio_chip), GFP_KERNEL); - 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 = 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; -} - -/* Update only those GRERx and GFERx edge detection register bits if those - * bits are set in c->irq_mask - */ -static inline void update_edge_detect(struct pxa_gpio_chip *c) -{ - uint32_t grer, gfer; - - grer = __raw_readl(c->regbase + GRER_OFFSET) & ~c->irq_mask; - gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~c->irq_mask; - grer |= c->irq_edge_rise & c->irq_mask; - gfer |= c->irq_edge_fall & c->irq_mask; - __raw_writel(grer, c->regbase + GRER_OFFSET); - __raw_writel(gfer, c->regbase + GFER_OFFSET); -} - -static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type) -{ - struct pxa_gpio_chip *c; - int gpio = irq_to_gpio(d->irq); - unsigned long gpdr, mask = GPIO_bit(gpio); - - c = gpio_to_pxachip(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; - - update_edge_detect(c); - - pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->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(struct irq_data *d) -{ - int gpio = irq_to_gpio(d->irq); - struct pxa_gpio_chip *c = gpio_to_pxachip(gpio); - - __raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET); -} - -static void pxa_mask_muxed_gpio(struct irq_data *d) -{ - int gpio = irq_to_gpio(d->irq); - struct pxa_gpio_chip *c = gpio_to_pxachip(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(struct irq_data *d) -{ - int gpio = irq_to_gpio(d->irq); - struct pxa_gpio_chip *c = gpio_to_pxachip(gpio); - - c->irq_mask |= GPIO_bit(gpio); - update_edge_detect(c); -} - -static struct irq_chip pxa_muxed_gpio_chip = { - .name = "GPIO", - .irq_ack = pxa_ack_muxed_gpio, - .irq_mask = pxa_mask_muxed_gpio, - .irq_unmask = pxa_unmask_muxed_gpio, - .irq_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++) { - irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip, - handle_edge_irq); - set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); - } - - /* Install handler for GPIO>=2 edge detect interrupts */ - irq_set_chained_handler(mux_irq, pxa_gpio_demux_handler); - pxa_muxed_gpio_chip.irq_set_wake = fn; -} - -#ifdef CONFIG_PM -static int pxa_gpio_suspend(void) -{ - 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 void pxa_gpio_resume(void) -{ - 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); - } -} -#else -#define pxa_gpio_suspend NULL -#define pxa_gpio_resume NULL -#endif - -struct syscore_ops pxa_gpio_syscore_ops = { - .suspend = pxa_gpio_suspend, - .resume = pxa_gpio_resume, -}; |