aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-pxa/gpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-pxa/gpio.c')
-rw-r--r--arch/arm/mach-pxa/gpio.c453
1 files changed, 0 insertions, 453 deletions
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
deleted file mode 100644
index 5fec1e479cb..00000000000
--- a/arch/arm/mach-pxa/gpio.c
+++ /dev/null
@@ -1,453 +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 <linux/init.h>
-#include <linux/module.h>
-#include <linux/irq.h>
-#include <linux/sysdev.h>
-#include <linux/io.h>
-
-#include <asm/gpio.h>
-#include <mach/hardware.h>
-#include <mach/pxa-regs.h>
-#include <mach/pxa2xx-gpio.h>
-
-#include "generic.h"
-
-#define GPIO0_BASE ((void __iomem *)io_p2v(0x40E00000))
-#define GPIO1_BASE ((void __iomem *)io_p2v(0x40E00004))
-#define GPIO2_BASE ((void __iomem *)io_p2v(0x40E00008))
-#define GPIO3_BASE ((void __iomem *)io_p2v(0x40E00100))
-
-#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;
-};
-
-int pxa_last_gpio;
-
-#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.
- */
-static int __gpio_is_inverted(unsigned gpio)
-{
- return cpu_is_pxa25x() && gpio > 85;
-}
-#else
-#define __gpio_is_inverted(gpio) (0)
-#endif
-
-/*
- * Configure pins for GPIO or other functions
- */
-int pxa_gpio_mode(int gpio_mode)
-{
- unsigned long flags;
- int gpio = gpio_mode & GPIO_MD_MASK_NR;
- int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
- int gafr;
-
- if (gpio > pxa_last_gpio)
- return -EINVAL;
-
- local_irq_save(flags);
- if (gpio_mode & GPIO_DFLT_LOW)
- GPCR(gpio) = GPIO_bit(gpio);
- else if (gpio_mode & GPIO_DFLT_HIGH)
- GPSR(gpio) = GPIO_bit(gpio);
- if (gpio_mode & GPIO_MD_MASK_DIR)
- GPDR(gpio) |= GPIO_bit(gpio);
- else
- GPDR(gpio) &= ~GPIO_bit(gpio);
- gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
- GAFR(gpio) = gafr | (fn << (((gpio) & 0xf)*2));
- local_irq_restore(flags);
-
- return 0;
-}
-EXPORT_SYMBOL(pxa_gpio_mode);
-
-static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- unsigned long flags;
- u32 mask = 1 << offset;
- u32 value;
- struct pxa_gpio_chip *pxa;
- void __iomem *gpdr;
-
- pxa = container_of(chip, struct pxa_gpio_chip, chip);
- gpdr = pxa->regbase + GPDR_OFFSET;
- local_irq_save(flags);
- value = __raw_readl(gpdr);
- if (__gpio_is_inverted(chip->base + offset))
- value |= mask;
- else
- value &= ~mask;
- __raw_writel(value, gpdr);
- local_irq_restore(flags);
-
- return 0;
-}
-
-static int pxa_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset, int value)
-{
- unsigned long flags;
- u32 mask = 1 << offset;
- u32 tmp;
- struct pxa_gpio_chip *pxa;
- void __iomem *gpdr;
-
- pxa = container_of(chip, struct pxa_gpio_chip, chip);
- __raw_writel(mask,
- pxa->regbase + (value ? GPSR_OFFSET : GPCR_OFFSET));
- gpdr = pxa->regbase + GPDR_OFFSET;
- local_irq_save(flags);
- tmp = __raw_readl(gpdr);
- if (__gpio_is_inverted(chip->base + offset))
- tmp &= ~mask;
- else
- tmp |= mask;
- __raw_writel(tmp, gpdr);
- local_irq_restore(flags);
-
- return 0;
-}
-
-/*
- * Return GPIO level
- */
-static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- u32 mask = 1 << offset;
- struct pxa_gpio_chip *pxa;
-
- pxa = container_of(chip, struct pxa_gpio_chip, chip);
- return __raw_readl(pxa->regbase + GPLR_OFFSET) & mask;
-}
-
-/*
- * Set output GPIO level
- */
-static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
- u32 mask = 1 << offset;
- struct pxa_gpio_chip *pxa;
-
- pxa = container_of(chip, struct pxa_gpio_chip, chip);
-
- if (value)
- __raw_writel(mask, pxa->regbase + GPSR_OFFSET);
- else
- __raw_writel(mask, pxa->regbase + GPCR_OFFSET);
-}
-
-#define GPIO_CHIP(_n) \
- [_n] = { \
- .regbase = GPIO##_n##_BASE, \
- .chip = { \
- .label = "gpio-" #_n, \
- .direction_input = pxa_gpio_direction_input, \
- .direction_output = pxa_gpio_direction_output, \
- .get = pxa_gpio_get, \
- .set = pxa_gpio_set, \
- .base = (_n) * 32, \
- .ngpio = 32, \
- }, \
- }
-
-static struct pxa_gpio_chip pxa_gpio_chip[] = {
- GPIO_CHIP(0),
- GPIO_CHIP(1),
- GPIO_CHIP(2),
-#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
- GPIO_CHIP(3),
-#endif
-};
-
-/*
- * PXA GPIO edge detection for IRQs:
- * IRQs are generated on Falling-Edge, Rising-Edge, or both.
- * Use this instead of directly setting GRER/GFER.
- */
-
-static unsigned long GPIO_IRQ_rising_edge[4];
-static unsigned long GPIO_IRQ_falling_edge[4];
-static unsigned long GPIO_IRQ_mask[4];
-
-/*
- * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
- * function of a GPIO, and GPDRx cannot be altered once configured. It
- * is attributed as "occupied" here (I know this terminology isn't
- * accurate, you are welcome to propose a better one :-)
- */
-static int __gpio_is_occupied(unsigned gpio)
-{
- if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
- int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
- int dir = GPDR(gpio) & GPIO_bit(gpio);
-
- if (__gpio_is_inverted(gpio))
- return af != 1 || dir == 0;
- else
- return af != 0 || dir != 0;
- }
-
- return 0;
-}
-
-static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
-{
- int gpio, idx;
-
- gpio = IRQ_TO_GPIO(irq);
- idx = gpio >> 5;
-
- 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 ((GPIO_IRQ_rising_edge[idx] & GPIO_bit(gpio)) ||
- (GPIO_IRQ_falling_edge[idx] & GPIO_bit(gpio)))
- return 0;
-
- if (__gpio_is_occupied(gpio))
- return 0;
-
- type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
- }
-
- if (__gpio_is_inverted(gpio))
- GPDR(gpio) |= GPIO_bit(gpio);
- else
- GPDR(gpio) &= ~GPIO_bit(gpio);
-
- if (type & IRQ_TYPE_EDGE_RISING)
- __set_bit(gpio, GPIO_IRQ_rising_edge);
- else
- __clear_bit(gpio, GPIO_IRQ_rising_edge);
-
- if (type & IRQ_TYPE_EDGE_FALLING)
- __set_bit(gpio, GPIO_IRQ_falling_edge);
- else
- __clear_bit(gpio, GPIO_IRQ_falling_edge);
-
- GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
- GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
-
- 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;
-}
-
-/*
- * GPIO IRQs must be acknowledged. This is for GPIO 0 and 1.
- */
-
-static void pxa_ack_low_gpio(unsigned int irq)
-{
- GEDR0 = (1 << (irq - IRQ_GPIO0));
-}
-
-static void pxa_mask_low_gpio(unsigned int irq)
-{
- ICMR &= ~(1 << (irq - PXA_IRQ(0)));
-}
-
-static void pxa_unmask_low_gpio(unsigned int irq)
-{
- ICMR |= 1 << (irq - PXA_IRQ(0));
-}
-
-static struct irq_chip pxa_low_gpio_chip = {
- .name = "GPIO-l",
- .ack = pxa_ack_low_gpio,
- .mask = pxa_mask_low_gpio,
- .unmask = pxa_unmask_low_gpio,
- .set_type = pxa_gpio_irq_type,
-};
-
-/*
- * Demux handler for GPIO>=2 edge detect interrupts
- */
-
-#define GEDR_BITS (sizeof(gedr) * BITS_PER_BYTE)
-
-static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
-{
- int loop, bit, n;
- unsigned long gedr[4];
-
- do {
- gedr[0] = GEDR0 & GPIO_IRQ_mask[0] & ~3;
- gedr[1] = GEDR1 & GPIO_IRQ_mask[1];
- gedr[2] = GEDR2 & GPIO_IRQ_mask[2];
- gedr[3] = GEDR3 & GPIO_IRQ_mask[3];
-
- GEDR0 = gedr[0]; GEDR1 = gedr[1];
- GEDR2 = gedr[2]; GEDR3 = gedr[3];
-
- loop = 0;
- bit = find_first_bit(gedr, GEDR_BITS);
- while (bit < GEDR_BITS) {
- loop = 1;
-
- n = PXA_GPIO_IRQ_BASE + bit;
- generic_handle_irq(n);
-
- bit = find_next_bit(gedr, GEDR_BITS, bit + 1);
- }
- } while (loop);
-}
-
-static void pxa_ack_muxed_gpio(unsigned int irq)
-{
- int gpio = irq - IRQ_GPIO(2) + 2;
- GEDR(gpio) = GPIO_bit(gpio);
-}
-
-static void pxa_mask_muxed_gpio(unsigned int irq)
-{
- int gpio = irq - IRQ_GPIO(2) + 2;
- __clear_bit(gpio, GPIO_IRQ_mask);
- GRER(gpio) &= ~GPIO_bit(gpio);
- GFER(gpio) &= ~GPIO_bit(gpio);
-}
-
-static void pxa_unmask_muxed_gpio(unsigned int irq)
-{
- int gpio = irq - IRQ_GPIO(2) + 2;
- int idx = gpio >> 5;
- __set_bit(gpio, GPIO_IRQ_mask);
- GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
- GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
-}
-
-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 gpio_nr, set_wake_t fn)
-{
- int irq, i, gpio;
-
- pxa_last_gpio = gpio_nr - 1;
-
- /* clear all GPIO edge detects */
- for (i = 0; i < gpio_nr; i += 32) {
- GFER(i) = 0;
- GRER(i) = 0;
- GEDR(i) = GEDR(i);
- }
-
- /* GPIO 0 and 1 must have their mask bit always set */
- GPIO_IRQ_mask[0] = 3;
-
- for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
- set_irq_chip(irq, &pxa_low_gpio_chip);
- set_irq_handler(irq, handle_edge_irq);
- set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
- }
-
- for (irq = IRQ_GPIO(2); irq < IRQ_GPIO(gpio_nr); 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(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
-
- pxa_low_gpio_chip.set_wake = fn;
- pxa_muxed_gpio_chip.set_wake = fn;
-
- /* add a GPIO chip for each register bank.
- * the last PXA25x register only contains 21 GPIOs
- */
- for (gpio = 0, i = 0; gpio < gpio_nr; gpio += 32, i++) {
- if (gpio + 32 > gpio_nr)
- pxa_gpio_chip[i].chip.ngpio = gpio_nr - gpio;
- gpiochip_add(&pxa_gpio_chip[i].chip);
- }
-}
-
-#ifdef CONFIG_PM
-
-static unsigned long saved_gplr[4];
-static unsigned long saved_gpdr[4];
-static unsigned long saved_grer[4];
-static unsigned long saved_gfer[4];
-
-static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state)
-{
- int i, gpio;
-
- for (gpio = 0, i = 0; gpio < pxa_last_gpio; gpio += 32, i++) {
- saved_gplr[i] = GPLR(gpio);
- saved_gpdr[i] = GPDR(gpio);
- saved_grer[i] = GRER(gpio);
- saved_gfer[i] = GFER(gpio);
-
- /* Clear GPIO transition detect bits */
- GEDR(gpio) = GEDR(gpio);
- }
- return 0;
-}
-
-static int pxa_gpio_resume(struct sys_device *dev)
-{
- int i, gpio;
-
- for (gpio = 0, i = 0; gpio < pxa_last_gpio; gpio += 32, i++) {
- /* restore level with set/clear */
- GPSR(gpio) = saved_gplr[i];
- GPCR(gpio) = ~saved_gplr[i];
-
- GRER(gpio) = saved_grer[i];
- GFER(gpio) = saved_gfer[i];
- GPDR(gpio) = saved_gpdr[i];
- }
- 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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 10:24:25 +0000