/* * Driver for NEC VR4100 series General-purpose I/O Unit. * * Copyright (C) 2002 MontaVista Software Inc. * Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com> * Copyright (C) 2003-2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> * * 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/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/smp_lock.h> #include <linux/spinlock.h> #include <linux/types.h> #include <asm/io.h> #include <asm/vr41xx/giu.h> #include <asm/vr41xx/irq.h> #include <asm/vr41xx/vr41xx.h> MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>"); MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver"); MODULE_LICENSE("GPL"); static int major; /* default is dynamic major device number */ module_param(major, int, 0); MODULE_PARM_DESC(major, "Major device number"); #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 static spinlock_t giu_lock; static unsigned long giu_flags; static unsigned int giu_nr_pins; 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 uint16_t giu_set(uint16_t offset, uint16_t set) { uint16_t data; data = giu_read(offset); data |= set; giu_write(offset, data); return data; } static inline uint16_t giu_clear(uint16_t offset, uint16_t clear) { uint16_t 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) { uint16_t 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) { uint16_t 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) { uint16_t 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); gpio_data_t vr41xx_gpio_get_pin(unsigned int pin) { uint16_t reg, mask; if (pin >= giu_nr_pins) return GPIO_DATA_INVAL; if (pin < 16) { reg = giu_read(GIUPIODL); mask = (uint16_t)1 << pin; } else if (pin < 32) { reg = giu_read(GIUPIODH); mask = (uint16_t)1 << (pin - 16); } else if (pin < 48) { reg = giu_read(GIUPODATL); mask = (uint16_t)1 << (pin - 32); } else { reg = giu_read(GIUPODATH); mask = (uint16_t)1 << (pin - 48); } if (reg & mask) return GPIO_DATA_HIGH; return GPIO_DATA_LOW; } EXPORT_SYMBOL_GPL(vr41xx_gpio_get_pin); int vr41xx_gpio_set_pin(unsigned int pin, gpio_data_t data) { uint16_t offset, mask, reg; unsigned long flags; if (pin >= giu_nr_pins) return -EINVAL; if (pin < 16) { offset = GIUPIODL; mask = (uint16_t)1 << pin; } else if (pin < 32) { offset = GIUPIODH; mask = (uint16_t)1 << (pin - 16); } else if (pin < 48) { offset = GIUPODATL; mask = (uint16_t)1 << (pin - 32); } else { offset = GIUPODATH; mask = (uint16_t)1 << (pin - 48); } spin_lock_irqsave(&giu_lock, flags); reg = giu_read(offset); if (data == GPIO_DATA_HIGH) reg |= mask; else reg &= ~mask; giu_write(offset, reg); spin_unlock_irqrestore(&giu_lock, flags); return 0; } EXPORT_SYMBOL_GPL(vr41xx_gpio_set_pin); int vr41xx_gpio_set_direction(unsigned int pin, gpio_direction_t dir) { uint16_t offset, mask, reg; unsigned long flags; if (pin >= giu_nr_pins) return -EINVAL; if (pin < 16) { offset = GIUIOSELL; mask = (uint16_t)1 << pin; } else if (pin < 32) { offset = GIUIOSELH; mask = (uint16_t)1 << (pin - 16); } else { if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) { offset = GIUPODATEN; mask = (uint16_t)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; } EXPORT_SYMBOL_GPL(vr41xx_gpio_set_direction); int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull) { uint16_t reg, mask; unsigned long flags; if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO) return -EPERM; if (pin >= 15) return -EINVAL; mask = (uint16_t)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 ssize_t gpio_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) { unsigned int pin; char value = '0'; pin = iminor(file->f_path.dentry->d_inode); if (pin >= giu_nr_pins) return -EBADF; if (vr41xx_gpio_get_pin(pin) == GPIO_DATA_HIGH) value = '1'; if (len <= 0) return -EFAULT; if (put_user(value, buf)) return -EFAULT; return 1; } static ssize_t gpio_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { unsigned int pin; size_t i; char c; int retval = 0; pin = iminor(file->f_path.dentry->d_inode); if (pin >= giu_nr_pins) return -EBADF; for (i = 0; i < len; i++) { if (get_user(c, data + i)) return -EFAULT; switch (c) { case '0': retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_LOW); break; case '1': retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_HIGH); break; case 'D': printk(KERN_INFO "GPIO%d: pull down\n", pin); retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DOWN); break; case 'd': printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin); retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE); break; case 'I': printk(KERN_INFO "GPIO%d: input\n", pin); retval = vr41xx_gpio_set_direction(pin, GPIO_INPUT); break; case 'O': printk(KERN_INFO "GPIO%d: output\n", pin); retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT); break; case 'o': printk(KERN_INFO "GPIO%d: output disable\n", pin); retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT_DISABLE); break; case 'P': printk(KERN_INFO "GPIO%d: pull up\n", pin); retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_UP); break; case 'p': printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin); retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE); break; default: break; } if (retval < 0) break; } return i; } static int gpio_open(struct inode *inode, struct file *file) { unsigned int pin; cycle_kernel_lock(); pin = iminor(inode); if (pin >= giu_nr_pins) return -EBADF; return nonseekable_open(inode, file); } static int gpio_release(struct inode *inode, struct file *file) { unsigned int pin; pin = iminor(inode); if (pin >= giu_nr_pins) return -EBADF; return 0; } static const struct file_operations gpio_fops = { .owner = THIS_MODULE, .read = gpio_read, .write = gpio_write, .open = gpio_open, .release = gpio_release, }; static int __devinit giu_probe(struct platform_device *dev) { struct resource *res; unsigned int trigger, i, pin; struct irq_chip *chip; int irq, retval; switch (dev->id) { case GPIO_50PINS_PULLUPDOWN: giu_flags = GPIO_HAS_PULLUPDOWN_IO; giu_nr_pins = 50; break; case GPIO_36PINS: giu_nr_pins = 36; break; case GPIO_48PINS_EDGE_SELECT: giu_flags = GPIO_HAS_INTERRUPT_EDGE_SELECT; giu_nr_pins = 48; break; default: printk(KERN_ERR "GIU: unknown ID %d\n", dev->id); return -ENODEV; } res = platform_get_resource(dev, IORESOURCE_MEM, 0); if (!res) return -EBUSY; giu_base = ioremap(res->start, res->end - res->start + 1); if (!giu_base) return -ENOMEM; retval = register_chrdev(major, "GIU", &gpio_fops); if (retval < 0) { iounmap(giu_base); giu_base = NULL; return retval; } if (major == 0) { major = retval; printk(KERN_INFO "GIU: major number %d\n", major); } spin_lock_init(&giu_lock); 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(dev, 0); if (irq < 0 || irq >= NR_IRQS) return -EBUSY; return cascade_irq(irq, giu_get_irq); } static int __devexit giu_remove(struct platform_device *dev) { 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);