diff options
Diffstat (limited to 'kernel/drivers/char/tb0219.c')
| -rw-r--r-- | kernel/drivers/char/tb0219.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/kernel/drivers/char/tb0219.c b/kernel/drivers/char/tb0219.c new file mode 100644 index 000000000..480a777db --- /dev/null +++ b/kernel/drivers/char/tb0219.c @@ -0,0 +1,371 @@ +/* + * Driver for TANBAC TB0219 base board. + * + * Copyright (C) 2005 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/platform_device.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/module.h> + +#include <asm/io.h> +#include <asm/reboot.h> +#include <asm/vr41xx/giu.h> +#include <asm/vr41xx/tb0219.h> + +MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); +MODULE_DESCRIPTION("TANBAC TB0219 base board 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"); + +static void (*old_machine_restart)(char *command); +static void __iomem *tb0219_base; +static DEFINE_SPINLOCK(tb0219_lock); + +#define tb0219_read(offset) readw(tb0219_base + (offset)) +#define tb0219_write(offset, value) writew((value), tb0219_base + (offset)) + +#define TB0219_START 0x0a000000UL +#define TB0219_SIZE 0x20UL + +#define TB0219_LED 0x00 +#define TB0219_GPIO_INPUT 0x02 +#define TB0219_GPIO_OUTPUT 0x04 +#define TB0219_DIP_SWITCH 0x06 +#define TB0219_MISC 0x08 +#define TB0219_RESET 0x0e +#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10 +#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12 +#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14 + +typedef enum { + TYPE_LED, + TYPE_GPIO_OUTPUT, +} tb0219_type_t; + +/* + * Minor device number + * 0 = 7 segment LED + * + * 16 = GPIO IN 0 + * 17 = GPIO IN 1 + * 18 = GPIO IN 2 + * 19 = GPIO IN 3 + * 20 = GPIO IN 4 + * 21 = GPIO IN 5 + * 22 = GPIO IN 6 + * 23 = GPIO IN 7 + * + * 32 = GPIO OUT 0 + * 33 = GPIO OUT 1 + * 34 = GPIO OUT 2 + * 35 = GPIO OUT 3 + * 36 = GPIO OUT 4 + * 37 = GPIO OUT 5 + * 38 = GPIO OUT 6 + * 39 = GPIO OUT 7 + * + * 48 = DIP switch 1 + * 49 = DIP switch 2 + * 50 = DIP switch 3 + * 51 = DIP switch 4 + * 52 = DIP switch 5 + * 53 = DIP switch 6 + * 54 = DIP switch 7 + * 55 = DIP switch 8 + */ + +static inline char get_led(void) +{ + return (char)tb0219_read(TB0219_LED); +} + +static inline char get_gpio_input_pin(unsigned int pin) +{ + uint16_t values; + + values = tb0219_read(TB0219_GPIO_INPUT); + if (values & (1 << pin)) + return '1'; + + return '0'; +} + +static inline char get_gpio_output_pin(unsigned int pin) +{ + uint16_t values; + + values = tb0219_read(TB0219_GPIO_OUTPUT); + if (values & (1 << pin)) + return '1'; + + return '0'; +} + +static inline char get_dip_switch(unsigned int pin) +{ + uint16_t values; + + values = tb0219_read(TB0219_DIP_SWITCH); + if (values & (1 << pin)) + return '1'; + + return '0'; +} + +static inline int set_led(char command) +{ + tb0219_write(TB0219_LED, command); + + return 0; +} + +static inline int set_gpio_output_pin(unsigned int pin, char command) +{ + unsigned long flags; + uint16_t value; + + if (command != '0' && command != '1') + return -EINVAL; + + spin_lock_irqsave(&tb0219_lock, flags); + value = tb0219_read(TB0219_GPIO_OUTPUT); + if (command == '0') + value &= ~(1 << pin); + else + value |= 1 << pin; + tb0219_write(TB0219_GPIO_OUTPUT, value); + spin_unlock_irqrestore(&tb0219_lock, flags); + + return 0; + +} + +static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len, + loff_t *ppos) +{ + unsigned int minor; + char value; + + minor = iminor(file_inode(file)); + switch (minor) { + case 0: + value = get_led(); + break; + case 16 ... 23: + value = get_gpio_input_pin(minor - 16); + break; + case 32 ... 39: + value = get_gpio_output_pin(minor - 32); + break; + case 48 ... 55: + value = get_dip_switch(minor - 48); + break; + default: + return -EBADF; + } + + if (len <= 0) + return -EFAULT; + + if (put_user(value, buf)) + return -EFAULT; + + return 1; +} + +static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data, + size_t len, loff_t *ppos) +{ + unsigned int minor; + tb0219_type_t type; + size_t i; + int retval = 0; + char c; + + minor = iminor(file_inode(file)); + switch (minor) { + case 0: + type = TYPE_LED; + break; + case 32 ... 39: + type = TYPE_GPIO_OUTPUT; + break; + default: + return -EBADF; + } + + for (i = 0; i < len; i++) { + if (get_user(c, data + i)) + return -EFAULT; + + switch (type) { + case TYPE_LED: + retval = set_led(c); + break; + case TYPE_GPIO_OUTPUT: + retval = set_gpio_output_pin(minor - 32, c); + break; + } + + if (retval < 0) + break; + } + + return i; +} + +static int tanbac_tb0219_open(struct inode *inode, struct file *file) +{ + unsigned int minor; + + minor = iminor(inode); + switch (minor) { + case 0: + case 16 ... 23: + case 32 ... 39: + case 48 ... 55: + return nonseekable_open(inode, file); + default: + break; + } + + return -EBADF; +} + +static int tanbac_tb0219_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static const struct file_operations tb0219_fops = { + .owner = THIS_MODULE, + .read = tanbac_tb0219_read, + .write = tanbac_tb0219_write, + .open = tanbac_tb0219_open, + .release = tanbac_tb0219_release, + .llseek = no_llseek, +}; + +static void tb0219_restart(char *command) +{ + tb0219_write(TB0219_RESET, 0); +} + +static void tb0219_pci_irq_init(void) +{ + /* PCI Slot 1 */ + vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); + vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW); + + /* PCI Slot 2 */ + vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); + vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW); + + /* PCI Slot 3 */ + vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); + vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW); +} + +static int tb0219_probe(struct platform_device *dev) +{ + int retval; + + if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL) + return -EBUSY; + + tb0219_base = ioremap(TB0219_START, TB0219_SIZE); + if (tb0219_base == NULL) { + release_mem_region(TB0219_START, TB0219_SIZE); + return -ENOMEM; + } + + retval = register_chrdev(major, "TB0219", &tb0219_fops); + if (retval < 0) { + iounmap(tb0219_base); + tb0219_base = NULL; + release_mem_region(TB0219_START, TB0219_SIZE); + return retval; + } + + old_machine_restart = _machine_restart; + _machine_restart = tb0219_restart; + + tb0219_pci_irq_init(); + + if (major == 0) { + major = retval; + printk(KERN_INFO "TB0219: major number %d\n", major); + } + + return 0; +} + +static int tb0219_remove(struct platform_device *dev) +{ + _machine_restart = old_machine_restart; + + iounmap(tb0219_base); + tb0219_base = NULL; + + release_mem_region(TB0219_START, TB0219_SIZE); + + return 0; +} + +static struct platform_device *tb0219_platform_device; + +static struct platform_driver tb0219_device_driver = { + .probe = tb0219_probe, + .remove = tb0219_remove, + .driver = { + .name = "TB0219", + }, +}; + +static int __init tanbac_tb0219_init(void) +{ + int retval; + + tb0219_platform_device = platform_device_alloc("TB0219", -1); + if (!tb0219_platform_device) + return -ENOMEM; + + retval = platform_device_add(tb0219_platform_device); + if (retval < 0) { + platform_device_put(tb0219_platform_device); + return retval; + } + + retval = platform_driver_register(&tb0219_device_driver); + if (retval < 0) + platform_device_unregister(tb0219_platform_device); + + return retval; +} + +static void __exit tanbac_tb0219_exit(void) +{ + platform_driver_unregister(&tb0219_device_driver); + platform_device_unregister(tb0219_platform_device); +} + +module_init(tanbac_tb0219_init); +module_exit(tanbac_tb0219_exit); |