1 files changed, 585 insertions, 0 deletions

diff --git a/drivers/gpio/vr41xx_giu.c b/drivers/gpio/vr41xx_giu.c
new file mode 100644
index 000000000000..b16c9a8c03f5
--- /dev/null
+++ b/drivers/gpio/vr41xx_giu.c
@@ -0,0 +1,585 @@
+/*
+ *  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>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/gpio.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;
+
+#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(unsigned int irq)
+{
+        giu_write(GIUINTSTATL, 1 << GPIO_PIN_OF_IRQ(irq));
+}
+
+static void mask_giuint_low(unsigned int irq)
+{
+        giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
+}
+
+static void mask_ack_giuint_low(unsigned int irq)
+{
+        unsigned int pin;
+
+        pin = GPIO_PIN_OF_IRQ(irq);
+        giu_clear(GIUINTENL, 1 << pin);
+        giu_write(GIUINTSTATL, 1 << pin);
+}
+
+static void unmask_giuint_low(unsigned int irq)
+{
+        giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
+}
+
+static struct irq_chip giuint_low_irq_chip = {
+        .name           = "GIUINTL",
+        .ack            = ack_giuint_low,
+        .mask           = mask_giuint_low,
+        .mask_ack       = mask_ack_giuint_low,
+        .unmask         = unmask_giuint_low,
+};
+
+static void ack_giuint_high(unsigned int irq)
+{
+        giu_write(GIUINTSTATH,
+                  1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
+}
+
+static void mask_giuint_high(unsigned int irq)
+{
+        giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
+}
+
+static void mask_ack_giuint_high(unsigned int irq)
+{
+        unsigned int pin;
+
+        pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
+        giu_clear(GIUINTENH, 1 << pin);
+        giu_write(GIUINTSTATH, 1 << pin);
+}
+
+static void unmask_giuint_high(unsigned int irq)
+{
+        giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
+}
+
+static struct irq_chip giuint_high_irq_chip = {
+        .name           = "GIUINTH",
+        .ack            = ack_giuint_high,
+        .mask           = mask_giuint_high,
+        .mask_ack       = mask_ack_giuint_high,
+        .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);
+
+        atomic_inc(&irq_err_count);
+
+        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;
+                                }
+                        }
+                        set_irq_chip_and_handler(GIU_IRQ(pin),
+                                                 &giuint_low_irq_chip,
+                                                 handle_edge_irq);
+                } else {
+                        giu_clear(GIUINTTYPL, mask);
+                        giu_clear(GIUINTHTSELL, mask);
+                        set_irq_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;
+                                }
+                        }
+                        set_irq_chip_and_handler(GIU_IRQ(pin),
+                                                 &giuint_high_irq_chip,
+                                                 handle_edge_irq);
+                } else {
+                        giu_clear(GIUINTTYPH, mask);
+                        giu_clear(GIUINTHTSELH, mask);
+                        set_irq_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;
+}
+
+int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
+{
+        u16 reg, mask;
+        unsigned long flags;
+
+        if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
+                return -EPERM;
+
+        if (pin >= 15)
+                return -EINVAL;
+
+        mask = 1 << pin;
+
+        spin_lock_irqsave(&giu_lock, flags);
+
+        if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
+                reg = giu_read(GIUTERMUPDN);
+                if (pull == GPIO_PULL_UP)
+                        reg |= mask;
+                else
+                        reg &= ~mask;
+                giu_write(GIUTERMUPDN, reg);
+
+                reg = giu_read(GIUUSEUPDN);
+                reg |= mask;
+                giu_write(GIUUSEUPDN, reg);
+        } else {
+                reg = giu_read(GIUUSEUPDN);
+                reg &= ~mask;
+                giu_write(GIUUSEUPDN, reg);
+        }
+
+        spin_unlock_irqrestore(&giu_lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
+
+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 __devinit giu_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        unsigned int trigger, i, pin;
+        struct irq_chip *chip;
+        int irq, retval;
+
+        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;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -EBUSY;
+
+        giu_base = ioremap(res->start, res->end - res->start + 1);
+        if (!giu_base)
+                return -ENOMEM;
+
+        vr41xx_gpio_chip.dev = &pdev->dev;
+
+        retval = gpiochip_add(&vr41xx_gpio_chip);
+
+        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))
+                        set_irq_chip_and_handler(i, chip, handle_edge_irq);
+                else
+                        set_irq_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 __devexit giu_remove(struct platform_device *pdev)
+{
+        if (giu_base) {
+                iounmap(giu_base);
+                giu_base = NULL;
+        }
+
+        return 0;
+}
+
+static struct platform_driver giu_device_driver = {
+        .probe          = giu_probe,
+        .remove         = __devexit_p(giu_remove),
+        .driver         = {
+                .name   = "GIU",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init vr41xx_giu_init(void)
+{
+        return platform_driver_register(&giu_device_driver);
+}
+
+static void __exit vr41xx_giu_exit(void)
+{
+        platform_driver_unregister(&giu_device_driver);
+}
+
+module_init(vr41xx_giu_init);
+module_exit(vr41xx_giu_exit);