2 * Driver for TANBAC TB0219 base board.
4 * Copyright (C) 2005 Yoichi Yuasa <yuasa@linux-mips.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/platform_device.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/smp_lock.h>
27 #include <asm/reboot.h>
28 #include <asm/vr41xx/giu.h>
29 #include <asm/vr41xx/tb0219.h>
31 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
32 MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
33 MODULE_LICENSE("GPL");
35 static int major; /* default is dynamic major device number */
36 module_param(major, int, 0);
37 MODULE_PARM_DESC(major, "Major device number");
39 static void (*old_machine_restart)(char *command);
40 static void __iomem *tb0219_base;
41 static spinlock_t tb0219_lock;
43 #define tb0219_read(offset) readw(tb0219_base + (offset))
44 #define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
46 #define TB0219_START 0x0a000000UL
47 #define TB0219_SIZE 0x20UL
49 #define TB0219_LED 0x00
50 #define TB0219_GPIO_INPUT 0x02
51 #define TB0219_GPIO_OUTPUT 0x04
52 #define TB0219_DIP_SWITCH 0x06
53 #define TB0219_MISC 0x08
54 #define TB0219_RESET 0x0e
55 #define TB0219_PCI_SLOT1_IRQ_STATUS 0x10
56 #define TB0219_PCI_SLOT2_IRQ_STATUS 0x12
57 #define TB0219_PCI_SLOT3_IRQ_STATUS 0x14
96 static inline char get_led(void)
98 return (char)tb0219_read(TB0219_LED);
101 static inline char get_gpio_input_pin(unsigned int pin)
105 values = tb0219_read(TB0219_GPIO_INPUT);
106 if (values & (1 << pin))
112 static inline char get_gpio_output_pin(unsigned int pin)
116 values = tb0219_read(TB0219_GPIO_OUTPUT);
117 if (values & (1 << pin))
123 static inline char get_dip_switch(unsigned int pin)
127 values = tb0219_read(TB0219_DIP_SWITCH);
128 if (values & (1 << pin))
134 static inline int set_led(char command)
136 tb0219_write(TB0219_LED, command);
141 static inline int set_gpio_output_pin(unsigned int pin, char command)
146 if (command != '0' && command != '1')
149 spin_lock_irqsave(&tb0219_lock, flags);
150 value = tb0219_read(TB0219_GPIO_OUTPUT);
152 value &= ~(1 << pin);
155 tb0219_write(TB0219_GPIO_OUTPUT, value);
156 spin_unlock_irqrestore(&tb0219_lock, flags);
162 static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
168 minor = iminor(file->f_path.dentry->d_inode);
174 value = get_gpio_input_pin(minor - 16);
177 value = get_gpio_output_pin(minor - 32);
180 value = get_dip_switch(minor - 48);
189 if (put_user(value, buf))
195 static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
196 size_t len, loff_t *ppos)
204 minor = iminor(file->f_path.dentry->d_inode);
210 type = TYPE_GPIO_OUTPUT;
216 for (i = 0; i < len; i++) {
217 if (get_user(c, data + i))
224 case TYPE_GPIO_OUTPUT:
225 retval = set_gpio_output_pin(minor - 32, c);
236 static int tanbac_tb0219_open(struct inode *inode, struct file *file)
241 minor = iminor(inode);
247 return nonseekable_open(inode, file);
255 static int tanbac_tb0219_release(struct inode *inode, struct file *file)
260 static const struct file_operations tb0219_fops = {
261 .owner = THIS_MODULE,
262 .read = tanbac_tb0219_read,
263 .write = tanbac_tb0219_write,
264 .open = tanbac_tb0219_open,
265 .release = tanbac_tb0219_release,
268 static void tb0219_restart(char *command)
270 tb0219_write(TB0219_RESET, 0);
273 static void tb0219_pci_irq_init(void)
276 vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
277 vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
280 vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
281 vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
284 vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
285 vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
288 static int __devinit tb0219_probe(struct platform_device *dev)
292 if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
295 tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
296 if (tb0219_base == NULL) {
297 release_mem_region(TB0219_START, TB0219_SIZE);
301 retval = register_chrdev(major, "TB0219", &tb0219_fops);
303 iounmap(tb0219_base);
305 release_mem_region(TB0219_START, TB0219_SIZE);
309 spin_lock_init(&tb0219_lock);
311 old_machine_restart = _machine_restart;
312 _machine_restart = tb0219_restart;
314 tb0219_pci_irq_init();
318 printk(KERN_INFO "TB0219: major number %d\n", major);
324 static int __devexit tb0219_remove(struct platform_device *dev)
326 _machine_restart = old_machine_restart;
328 iounmap(tb0219_base);
331 release_mem_region(TB0219_START, TB0219_SIZE);
336 static struct platform_device *tb0219_platform_device;
338 static struct platform_driver tb0219_device_driver = {
339 .probe = tb0219_probe,
340 .remove = __devexit_p(tb0219_remove),
343 .owner = THIS_MODULE,
347 static int __init tanbac_tb0219_init(void)
351 tb0219_platform_device = platform_device_alloc("TB0219", -1);
352 if (!tb0219_platform_device)
355 retval = platform_device_add(tb0219_platform_device);
357 platform_device_put(tb0219_platform_device);
361 retval = platform_driver_register(&tb0219_device_driver);
363 platform_device_unregister(tb0219_platform_device);
368 static void __exit tanbac_tb0219_exit(void)
370 platform_driver_unregister(&tb0219_device_driver);
371 platform_device_unregister(tb0219_platform_device);
374 module_init(tanbac_tb0219_init);
375 module_exit(tanbac_tb0219_exit);