+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Driver for NEC VR4100 series General-purpose I/O Unit.
- *
- * Copyright (C) 2002 MontaVista Software Inc.
- * Author: Yoichi Yuasa <source@mvista.com>
- * Copyright (C) 2003-2009 Yoichi Yuasa <yuasa@linux-mips.org>
- */
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/gpio/driver.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#include <asm/vr41xx/giu.h>
-#include <asm/vr41xx/irq.h>
-#include <asm/vr41xx/vr41xx.h>
-
-MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
-MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
-MODULE_LICENSE("GPL");
-
-#define GIUIOSELL 0x00
-#define GIUIOSELH 0x02
-#define GIUPIODL 0x04
-#define GIUPIODH 0x06
-#define GIUINTSTATL 0x08
-#define GIUINTSTATH 0x0a
-#define GIUINTENL 0x0c
-#define GIUINTENH 0x0e
-#define GIUINTTYPL 0x10
-#define GIUINTTYPH 0x12
-#define GIUINTALSELL 0x14
-#define GIUINTALSELH 0x16
-#define GIUINTHTSELL 0x18
-#define GIUINTHTSELH 0x1a
-#define GIUPODATL 0x1c
-#define GIUPODATEN 0x1c
-#define GIUPODATH 0x1e
- #define PIOEN0 0x0100
- #define PIOEN1 0x0200
-#define GIUPODAT 0x1e
-#define GIUFEDGEINHL 0x20
-#define GIUFEDGEINHH 0x22
-#define GIUREDGEINHL 0x24
-#define GIUREDGEINHH 0x26
-
-#define GIUUSEUPDN 0x1e0
-#define GIUTERMUPDN 0x1e2
-
-#define GPIO_HAS_PULLUPDOWN_IO 0x0001
-#define GPIO_HAS_OUTPUT_ENABLE 0x0002
-#define GPIO_HAS_INTERRUPT_EDGE_SELECT 0x0100
-
-enum {
- GPIO_INPUT,
- GPIO_OUTPUT,
-};
-
-static DEFINE_SPINLOCK(giu_lock);
-static unsigned long giu_flags;
-
-static void __iomem *giu_base;
-static struct gpio_chip vr41xx_gpio_chip;
-
-#define giu_read(offset) readw(giu_base + (offset))
-#define giu_write(offset, value) writew((value), giu_base + (offset))
-
-#define GPIO_PIN_OF_IRQ(irq) ((irq) - GIU_IRQ_BASE)
-#define GIUINT_HIGH_OFFSET 16
-#define GIUINT_HIGH_MAX 32
-
-static inline u16 giu_set(u16 offset, u16 set)
-{
- u16 data;
-
- data = giu_read(offset);
- data |= set;
- giu_write(offset, data);
-
- return data;
-}
-
-static inline u16 giu_clear(u16 offset, u16 clear)
-{
- u16 data;
-
- data = giu_read(offset);
- data &= ~clear;
- giu_write(offset, data);
-
- return data;
-}
-
-static void ack_giuint_low(struct irq_data *d)
-{
- giu_write(GIUINTSTATL, 1 << GPIO_PIN_OF_IRQ(d->irq));
-}
-
-static void mask_giuint_low(struct irq_data *d)
-{
- giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
-}
-
-static void mask_ack_giuint_low(struct irq_data *d)
-{
- unsigned int pin;
-
- pin = GPIO_PIN_OF_IRQ(d->irq);
- giu_clear(GIUINTENL, 1 << pin);
- giu_write(GIUINTSTATL, 1 << pin);
-}
-
-static void unmask_giuint_low(struct irq_data *d)
-{
- giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
-}
-
-static unsigned int startup_giuint(struct irq_data *data)
-{
- int ret;
-
- ret = gpiochip_lock_as_irq(&vr41xx_gpio_chip, irqd_to_hwirq(data));
- if (ret) {
- dev_err(vr41xx_gpio_chip.parent,
- "unable to lock HW IRQ %lu for IRQ\n",
- data->hwirq);
- return ret;
- }
-
- /* Satisfy the .enable semantics by unmasking the line */
- unmask_giuint_low(data);
- return 0;
-}
-
-static void shutdown_giuint(struct irq_data *data)
-{
- mask_giuint_low(data);
- gpiochip_unlock_as_irq(&vr41xx_gpio_chip, data->hwirq);
-}
-
-static struct irq_chip giuint_low_irq_chip = {
- .name = "GIUINTL",
- .irq_ack = ack_giuint_low,
- .irq_mask = mask_giuint_low,
- .irq_mask_ack = mask_ack_giuint_low,
- .irq_unmask = unmask_giuint_low,
- .irq_startup = startup_giuint,
- .irq_shutdown = shutdown_giuint,
-};
-
-static void ack_giuint_high(struct irq_data *d)
-{
- giu_write(GIUINTSTATH,
- 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
-}
-
-static void mask_giuint_high(struct irq_data *d)
-{
- giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
-}
-
-static void mask_ack_giuint_high(struct irq_data *d)
-{
- unsigned int pin;
-
- pin = GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET;
- giu_clear(GIUINTENH, 1 << pin);
- giu_write(GIUINTSTATH, 1 << pin);
-}
-
-static void unmask_giuint_high(struct irq_data *d)
-{
- giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
-}
-
-static struct irq_chip giuint_high_irq_chip = {
- .name = "GIUINTH",
- .irq_ack = ack_giuint_high,
- .irq_mask = mask_giuint_high,
- .irq_mask_ack = mask_ack_giuint_high,
- .irq_unmask = unmask_giuint_high,
-};
-
-static int giu_get_irq(unsigned int irq)
-{
- u16 pendl, pendh, maskl, maskh;
- int i;
-
- pendl = giu_read(GIUINTSTATL);
- pendh = giu_read(GIUINTSTATH);
- maskl = giu_read(GIUINTENL);
- maskh = giu_read(GIUINTENH);
-
- maskl &= pendl;
- maskh &= pendh;
-
- if (maskl) {
- for (i = 0; i < 16; i++) {
- if (maskl & (1 << i))
- return GIU_IRQ(i);
- }
- } else if (maskh) {
- for (i = 0; i < 16; i++) {
- if (maskh & (1 << i))
- return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
- }
- }
-
- printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
- maskl, pendl, maskh, pendh);
-
- return -EINVAL;
-}
-
-void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger,
- irq_signal_t signal)
-{
- u16 mask;
-
- if (pin < GIUINT_HIGH_OFFSET) {
- mask = 1 << pin;
- if (trigger != IRQ_TRIGGER_LEVEL) {
- giu_set(GIUINTTYPL, mask);
- if (signal == IRQ_SIGNAL_HOLD)
- giu_set(GIUINTHTSELL, mask);
- else
- giu_clear(GIUINTHTSELL, mask);
- if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
- switch (trigger) {
- case IRQ_TRIGGER_EDGE_FALLING:
- giu_set(GIUFEDGEINHL, mask);
- giu_clear(GIUREDGEINHL, mask);
- break;
- case IRQ_TRIGGER_EDGE_RISING:
- giu_clear(GIUFEDGEINHL, mask);
- giu_set(GIUREDGEINHL, mask);
- break;
- default:
- giu_set(GIUFEDGEINHL, mask);
- giu_set(GIUREDGEINHL, mask);
- break;
- }
- }
- irq_set_chip_and_handler(GIU_IRQ(pin),
- &giuint_low_irq_chip,
- handle_edge_irq);
- } else {
- giu_clear(GIUINTTYPL, mask);
- giu_clear(GIUINTHTSELL, mask);
- irq_set_chip_and_handler(GIU_IRQ(pin),
- &giuint_low_irq_chip,
- handle_level_irq);
- }
- giu_write(GIUINTSTATL, mask);
- } else if (pin < GIUINT_HIGH_MAX) {
- mask = 1 << (pin - GIUINT_HIGH_OFFSET);
- if (trigger != IRQ_TRIGGER_LEVEL) {
- giu_set(GIUINTTYPH, mask);
- if (signal == IRQ_SIGNAL_HOLD)
- giu_set(GIUINTHTSELH, mask);
- else
- giu_clear(GIUINTHTSELH, mask);
- if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
- switch (trigger) {
- case IRQ_TRIGGER_EDGE_FALLING:
- giu_set(GIUFEDGEINHH, mask);
- giu_clear(GIUREDGEINHH, mask);
- break;
- case IRQ_TRIGGER_EDGE_RISING:
- giu_clear(GIUFEDGEINHH, mask);
- giu_set(GIUREDGEINHH, mask);
- break;
- default:
- giu_set(GIUFEDGEINHH, mask);
- giu_set(GIUREDGEINHH, mask);
- break;
- }
- }
- irq_set_chip_and_handler(GIU_IRQ(pin),
- &giuint_high_irq_chip,
- handle_edge_irq);
- } else {
- giu_clear(GIUINTTYPH, mask);
- giu_clear(GIUINTHTSELH, mask);
- irq_set_chip_and_handler(GIU_IRQ(pin),
- &giuint_high_irq_chip,
- handle_level_irq);
- }
- giu_write(GIUINTSTATH, mask);
- }
-}
-EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
-
-void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
-{
- u16 mask;
-
- if (pin < GIUINT_HIGH_OFFSET) {
- mask = 1 << pin;
- if (level == IRQ_LEVEL_HIGH)
- giu_set(GIUINTALSELL, mask);
- else
- giu_clear(GIUINTALSELL, mask);
- giu_write(GIUINTSTATL, mask);
- } else if (pin < GIUINT_HIGH_MAX) {
- mask = 1 << (pin - GIUINT_HIGH_OFFSET);
- if (level == IRQ_LEVEL_HIGH)
- giu_set(GIUINTALSELH, mask);
- else
- giu_clear(GIUINTALSELH, mask);
- giu_write(GIUINTSTATH, mask);
- }
-}
-EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
-
-static int giu_set_direction(struct gpio_chip *chip, unsigned pin, int dir)
-{
- u16 offset, mask, reg;
- unsigned long flags;
-
- if (pin >= chip->ngpio)
- return -EINVAL;
-
- if (pin < 16) {
- offset = GIUIOSELL;
- mask = 1 << pin;
- } else if (pin < 32) {
- offset = GIUIOSELH;
- mask = 1 << (pin - 16);
- } else {
- if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
- offset = GIUPODATEN;
- mask = 1 << (pin - 32);
- } else {
- switch (pin) {
- case 48:
- offset = GIUPODATH;
- mask = PIOEN0;
- break;
- case 49:
- offset = GIUPODATH;
- mask = PIOEN1;
- break;
- default:
- return -EINVAL;
- }
- }
- }
-
- spin_lock_irqsave(&giu_lock, flags);
-
- reg = giu_read(offset);
- if (dir == GPIO_OUTPUT)
- reg |= mask;
- else
- reg &= ~mask;
- giu_write(offset, reg);
-
- spin_unlock_irqrestore(&giu_lock, flags);
-
- return 0;
-}
-
-static int vr41xx_gpio_get(struct gpio_chip *chip, unsigned pin)
-{
- u16 reg, mask;
-
- if (pin >= chip->ngpio)
- return -EINVAL;
-
- if (pin < 16) {
- reg = giu_read(GIUPIODL);
- mask = 1 << pin;
- } else if (pin < 32) {
- reg = giu_read(GIUPIODH);
- mask = 1 << (pin - 16);
- } else if (pin < 48) {
- reg = giu_read(GIUPODATL);
- mask = 1 << (pin - 32);
- } else {
- reg = giu_read(GIUPODATH);
- mask = 1 << (pin - 48);
- }
-
- if (reg & mask)
- return 1;
-
- return 0;
-}
-
-static void vr41xx_gpio_set(struct gpio_chip *chip, unsigned pin,
- int value)
-{
- u16 offset, mask, reg;
- unsigned long flags;
-
- if (pin >= chip->ngpio)
- return;
-
- if (pin < 16) {
- offset = GIUPIODL;
- mask = 1 << pin;
- } else if (pin < 32) {
- offset = GIUPIODH;
- mask = 1 << (pin - 16);
- } else if (pin < 48) {
- offset = GIUPODATL;
- mask = 1 << (pin - 32);
- } else {
- offset = GIUPODATH;
- mask = 1 << (pin - 48);
- }
-
- spin_lock_irqsave(&giu_lock, flags);
-
- reg = giu_read(offset);
- if (value)
- reg |= mask;
- else
- reg &= ~mask;
- giu_write(offset, reg);
-
- spin_unlock_irqrestore(&giu_lock, flags);
-}
-
-
-static int vr41xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- return giu_set_direction(chip, offset, GPIO_INPUT);
-}
-
-static int vr41xx_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
- int value)
-{
- vr41xx_gpio_set(chip, offset, value);
-
- return giu_set_direction(chip, offset, GPIO_OUTPUT);
-}
-
-static int vr41xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- if (offset >= chip->ngpio)
- return -EINVAL;
-
- return GIU_IRQ_BASE + offset;
-}
-
-static struct gpio_chip vr41xx_gpio_chip = {
- .label = "vr41xx",
- .owner = THIS_MODULE,
- .direction_input = vr41xx_gpio_direction_input,
- .get = vr41xx_gpio_get,
- .direction_output = vr41xx_gpio_direction_output,
- .set = vr41xx_gpio_set,
- .to_irq = vr41xx_gpio_to_irq,
-};
-
-static int giu_probe(struct platform_device *pdev)
-{
- unsigned int trigger, i, pin;
- struct irq_chip *chip;
- int irq;
-
- switch (pdev->id) {
- case GPIO_50PINS_PULLUPDOWN:
- giu_flags = GPIO_HAS_PULLUPDOWN_IO;
- vr41xx_gpio_chip.ngpio = 50;
- break;
- case GPIO_36PINS:
- vr41xx_gpio_chip.ngpio = 36;
- break;
- case GPIO_48PINS_EDGE_SELECT:
- giu_flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
- vr41xx_gpio_chip.ngpio = 48;
- break;
- default:
- dev_err(&pdev->dev, "GIU: unknown ID %d\n", pdev->id);
- return -ENODEV;
- }
-
- giu_base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(giu_base))
- return PTR_ERR(giu_base);
-
- vr41xx_gpio_chip.parent = &pdev->dev;
-
- if (gpiochip_add_data(&vr41xx_gpio_chip, NULL))
- return -ENODEV;
-
- giu_write(GIUINTENL, 0);
- giu_write(GIUINTENH, 0);
-
- trigger = giu_read(GIUINTTYPH) << 16;
- trigger |= giu_read(GIUINTTYPL);
- for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
- pin = GPIO_PIN_OF_IRQ(i);
- if (pin < GIUINT_HIGH_OFFSET)
- chip = &giuint_low_irq_chip;
- else
- chip = &giuint_high_irq_chip;
-
- if (trigger & (1 << pin))
- irq_set_chip_and_handler(i, chip, handle_edge_irq);
- else
- irq_set_chip_and_handler(i, chip, handle_level_irq);
-
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0 || irq >= nr_irqs)
- return -EBUSY;
-
- return cascade_irq(irq, giu_get_irq);
-}
-
-static int giu_remove(struct platform_device *pdev)
-{
- if (giu_base) {
- giu_base = NULL;
- }
-
- return 0;
-}
-
-static struct platform_driver giu_device_driver = {
- .probe = giu_probe,
- .remove = giu_remove,
- .driver = {
- .name = "GIU",
- },
-};
-
-module_platform_driver(giu_device_driver);
projects / platform / kernel / linux-rpi.git / commitdiff