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path: root/drivers/gpio/pl061.c
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Diffstat (limited to 'drivers/gpio/pl061.c')
-rw-r--r--drivers/gpio/pl061.c360
1 files changed, 0 insertions, 360 deletions
diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
deleted file mode 100644
index 5005990f751..00000000000
--- a/drivers/gpio/pl061.c
+++ /dev/null
@@ -1,360 +0,0 @@
-/*
- * linux/drivers/gpio/pl061.c
- *
- * Copyright (C) 2008, 2009 Provigent Ltd.
- *
- * 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.
- *
- * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
- *
- * Data sheet: ARM DDI 0190B, September 2000
- */
-#include <linux/spinlock.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/list.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/irq.h>
-#include <linux/bitops.h>
-#include <linux/workqueue.h>
-#include <linux/gpio.h>
-#include <linux/device.h>
-#include <linux/amba/bus.h>
-#include <linux/amba/pl061.h>
-#include <linux/slab.h>
-
-#define GPIODIR 0x400
-#define GPIOIS 0x404
-#define GPIOIBE 0x408
-#define GPIOIEV 0x40C
-#define GPIOIE 0x410
-#define GPIORIS 0x414
-#define GPIOMIS 0x418
-#define GPIOIC 0x41C
-
-#define PL061_GPIO_NR 8
-
-struct pl061_gpio {
- /* We use a list of pl061_gpio structs for each trigger IRQ in the main
- * interrupts controller of the system. We need this to support systems
- * in which more that one PL061s are connected to the same IRQ. The ISR
- * interates through this list to find the source of the interrupt.
- */
- struct list_head list;
-
- /* Each of the two spinlocks protects a different set of hardware
- * regiters and data structurs. This decouples the code of the IRQ from
- * the GPIO code. This also makes the case of a GPIO routine call from
- * the IRQ code simpler.
- */
- spinlock_t lock; /* GPIO registers */
- spinlock_t irq_lock; /* IRQ registers */
-
- void __iomem *base;
- unsigned irq_base;
- struct gpio_chip gc;
-};
-
-static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
-{
- struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
- unsigned long flags;
- unsigned char gpiodir;
-
- if (offset >= gc->ngpio)
- return -EINVAL;
-
- spin_lock_irqsave(&chip->lock, flags);
- gpiodir = readb(chip->base + GPIODIR);
- gpiodir &= ~(1 << offset);
- writeb(gpiodir, chip->base + GPIODIR);
- spin_unlock_irqrestore(&chip->lock, flags);
-
- return 0;
-}
-
-static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
- int value)
-{
- struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
- unsigned long flags;
- unsigned char gpiodir;
-
- if (offset >= gc->ngpio)
- return -EINVAL;
-
- spin_lock_irqsave(&chip->lock, flags);
- writeb(!!value << offset, chip->base + (1 << (offset + 2)));
- gpiodir = readb(chip->base + GPIODIR);
- gpiodir |= 1 << offset;
- writeb(gpiodir, chip->base + GPIODIR);
-
- /*
- * gpio value is set again, because pl061 doesn't allow to set value of
- * a gpio pin before configuring it in OUT mode.
- */
- writeb(!!value << offset, chip->base + (1 << (offset + 2)));
- spin_unlock_irqrestore(&chip->lock, flags);
-
- return 0;
-}
-
-static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
-{
- struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
-
- return !!readb(chip->base + (1 << (offset + 2)));
-}
-
-static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
-{
- struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
-
- writeb(!!value << offset, chip->base + (1 << (offset + 2)));
-}
-
-static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
-{
- struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
-
- if (chip->irq_base == (unsigned) -1)
- return -EINVAL;
-
- return chip->irq_base + offset;
-}
-
-/*
- * PL061 GPIO IRQ
- */
-static void pl061_irq_disable(unsigned irq)
-{
- struct pl061_gpio *chip = get_irq_chip_data(irq);
- int offset = irq - chip->irq_base;
- unsigned long flags;
- u8 gpioie;
-
- spin_lock_irqsave(&chip->irq_lock, flags);
- gpioie = readb(chip->base + GPIOIE);
- gpioie &= ~(1 << offset);
- writeb(gpioie, chip->base + GPIOIE);
- spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
-static void pl061_irq_enable(unsigned irq)
-{
- struct pl061_gpio *chip = get_irq_chip_data(irq);
- int offset = irq - chip->irq_base;
- unsigned long flags;
- u8 gpioie;
-
- spin_lock_irqsave(&chip->irq_lock, flags);
- gpioie = readb(chip->base + GPIOIE);
- gpioie |= 1 << offset;
- writeb(gpioie, chip->base + GPIOIE);
- spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
-static int pl061_irq_type(unsigned irq, unsigned trigger)
-{
- struct pl061_gpio *chip = get_irq_chip_data(irq);
- int offset = irq - chip->irq_base;
- unsigned long flags;
- u8 gpiois, gpioibe, gpioiev;
-
- if (offset < 0 || offset >= PL061_GPIO_NR)
- return -EINVAL;
-
- spin_lock_irqsave(&chip->irq_lock, flags);
-
- gpioiev = readb(chip->base + GPIOIEV);
-
- gpiois = readb(chip->base + GPIOIS);
- if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
- gpiois |= 1 << offset;
- if (trigger & IRQ_TYPE_LEVEL_HIGH)
- gpioiev |= 1 << offset;
- else
- gpioiev &= ~(1 << offset);
- } else
- gpiois &= ~(1 << offset);
- writeb(gpiois, chip->base + GPIOIS);
-
- gpioibe = readb(chip->base + GPIOIBE);
- if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
- gpioibe |= 1 << offset;
- else {
- gpioibe &= ~(1 << offset);
- if (trigger & IRQ_TYPE_EDGE_RISING)
- gpioiev |= 1 << offset;
- else if (trigger & IRQ_TYPE_EDGE_FALLING)
- gpioiev &= ~(1 << offset);
- }
- writeb(gpioibe, chip->base + GPIOIBE);
-
- writeb(gpioiev, chip->base + GPIOIEV);
-
- spin_unlock_irqrestore(&chip->irq_lock, flags);
-
- return 0;
-}
-
-static struct irq_chip pl061_irqchip = {
- .name = "GPIO",
- .enable = pl061_irq_enable,
- .disable = pl061_irq_disable,
- .set_type = pl061_irq_type,
-};
-
-static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
-{
- struct list_head *chip_list = get_irq_data(irq);
- struct list_head *ptr;
- struct pl061_gpio *chip;
-
- desc->chip->ack(irq);
- list_for_each(ptr, chip_list) {
- unsigned long pending;
- int offset;
-
- chip = list_entry(ptr, struct pl061_gpio, list);
- pending = readb(chip->base + GPIOMIS);
- writeb(pending, chip->base + GPIOIC);
-
- if (pending == 0)
- continue;
-
- for_each_set_bit(offset, &pending, PL061_GPIO_NR)
- generic_handle_irq(pl061_to_irq(&chip->gc, offset));
- }
- desc->chip->unmask(irq);
-}
-
-static int pl061_probe(struct amba_device *dev, struct amba_id *id)
-{
- struct pl061_platform_data *pdata;
- struct pl061_gpio *chip;
- struct list_head *chip_list;
- int ret, irq, i;
- static DECLARE_BITMAP(init_irq, NR_IRQS);
-
- pdata = dev->dev.platform_data;
- if (pdata == NULL)
- return -ENODEV;
-
- chip = kzalloc(sizeof(*chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
-
- if (!request_mem_region(dev->res.start,
- resource_size(&dev->res), "pl061")) {
- ret = -EBUSY;
- goto free_mem;
- }
-
- chip->base = ioremap(dev->res.start, resource_size(&dev->res));
- if (chip->base == NULL) {
- ret = -ENOMEM;
- goto release_region;
- }
-
- spin_lock_init(&chip->lock);
- spin_lock_init(&chip->irq_lock);
- INIT_LIST_HEAD(&chip->list);
-
- chip->gc.direction_input = pl061_direction_input;
- chip->gc.direction_output = pl061_direction_output;
- chip->gc.get = pl061_get_value;
- chip->gc.set = pl061_set_value;
- chip->gc.to_irq = pl061_to_irq;
- chip->gc.base = pdata->gpio_base;
- chip->gc.ngpio = PL061_GPIO_NR;
- chip->gc.label = dev_name(&dev->dev);
- chip->gc.dev = &dev->dev;
- chip->gc.owner = THIS_MODULE;
-
- chip->irq_base = pdata->irq_base;
-
- ret = gpiochip_add(&chip->gc);
- if (ret)
- goto iounmap;
-
- /*
- * irq_chip support
- */
-
- if (chip->irq_base == (unsigned) -1)
- return 0;
-
- writeb(0, chip->base + GPIOIE); /* disable irqs */
- irq = dev->irq[0];
- if (irq < 0) {
- ret = -ENODEV;
- goto iounmap;
- }
- set_irq_chained_handler(irq, pl061_irq_handler);
- if (!test_and_set_bit(irq, init_irq)) { /* list initialized? */
- chip_list = kmalloc(sizeof(*chip_list), GFP_KERNEL);
- if (chip_list == NULL) {
- clear_bit(irq, init_irq);
- ret = -ENOMEM;
- goto iounmap;
- }
- INIT_LIST_HEAD(chip_list);
- set_irq_data(irq, chip_list);
- } else
- chip_list = get_irq_data(irq);
- list_add(&chip->list, chip_list);
-
- for (i = 0; i < PL061_GPIO_NR; i++) {
- if (pdata->directions & (1 << i))
- pl061_direction_output(&chip->gc, i,
- pdata->values & (1 << i));
- else
- pl061_direction_input(&chip->gc, i);
-
- set_irq_chip(i+chip->irq_base, &pl061_irqchip);
- set_irq_handler(i+chip->irq_base, handle_simple_irq);
- set_irq_flags(i+chip->irq_base, IRQF_VALID);
- set_irq_chip_data(i+chip->irq_base, chip);
- }
-
- return 0;
-
-iounmap:
- iounmap(chip->base);
-release_region:
- release_mem_region(dev->res.start, resource_size(&dev->res));
-free_mem:
- kfree(chip);
-
- return ret;
-}
-
-static struct amba_id pl061_ids[] = {
- {
- .id = 0x00041061,
- .mask = 0x000fffff,
- },
- { 0, 0 },
-};
-
-static struct amba_driver pl061_gpio_driver = {
- .drv = {
- .name = "pl061_gpio",
- },
- .id_table = pl061_ids,
- .probe = pl061_probe,
-};
-
-static int __init pl061_gpio_init(void)
-{
- return amba_driver_register(&pl061_gpio_driver);
-}
-subsys_initcall(pl061_gpio_init);
-
-MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
-MODULE_DESCRIPTION("PL061 GPIO driver");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:15:03 +0000