2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2004 btxu Generate from INCA-IP project
17 * Copyright (C) 2005 Jin-Sze.Sow Comments edited
18 * Copyright (C) 2006 Huang Xiaogang Modification & verification on Danube chip
19 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/proc_fs.h>
26 #include <linux/init.h>
27 #include <linux/ioctl.h>
28 #include <linux/timer.h>
29 #include <linux/module.h>
30 #include <linux/timer.h>
31 #include <linux/interrupt.h>
32 #include <linux/kobject.h>
33 #include <linux/workqueue.h>
34 #include <linux/skbuff.h>
35 #include <linux/netlink.h>
36 #include <linux/platform_device.h>
37 #include <linux/uaccess.h>
38 #include <linux/semaphore.h>
39 #include <linux/gpio.h>
46 #define PINS_PER_PORT 16
48 #define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
50 #define GPIO_TO_PORT(x) ((x > 15) ? (1) : (0))
51 #define GPIO_TO_GPIO(x) ((x > 15) ? (x - 16) : (x))
54 ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
57 printk(KERN_INFO "%s : call to obseleted function\n", __func__);
60 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
63 ifxmips_port_free_pin(unsigned int port, unsigned int pin)
66 printk(KERN_INFO "%s : call to obseleted function\n", __func__);
69 EXPORT_SYMBOL(ifxmips_port_free_pin);
72 ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
75 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
76 IFXMIPS_GPIO_P0_OD + (port * 0xC));
79 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
82 ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
85 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
86 IFXMIPS_GPIO_P0_OD + (port * 0xC));
89 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
92 ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
95 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
96 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
99 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
102 ifxmips_port_clear_pudsel(unsigned int port, unsigned int pin)
105 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
106 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
109 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
112 ifxmips_port_set_puden(unsigned int port, unsigned int pin)
115 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
116 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
119 EXPORT_SYMBOL(ifxmips_port_set_puden);
122 ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
125 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
126 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
129 EXPORT_SYMBOL(ifxmips_port_clear_puden);
132 ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
135 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
136 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
139 EXPORT_SYMBOL(ifxmips_port_set_stoff);
142 ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
145 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
146 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
149 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
152 ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
155 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
156 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
159 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
162 ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
165 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
166 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
169 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
172 ifxmips_port_set_output(unsigned int port, unsigned int pin)
175 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
176 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
179 EXPORT_SYMBOL(ifxmips_port_set_output);
182 ifxmips_port_clear_output(unsigned int port, unsigned int pin)
185 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
186 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
189 EXPORT_SYMBOL(ifxmips_port_clear_output);
192 ifxmips_port_get_input(unsigned int port, unsigned int pin)
195 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
200 EXPORT_SYMBOL(ifxmips_port_get_input);
203 ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
206 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
207 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
210 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
213 ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
216 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
217 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
220 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
223 ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
226 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
227 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
230 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
233 ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
236 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
237 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
240 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
243 ifxmips_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
245 int port = GPIO_TO_PORT(offset);
246 int gpio = GPIO_TO_GPIO(offset);
248 ifxmips_port_set_output(port, gpio);
250 ifxmips_port_clear_output(port, gpio);
254 ifxmips_gpio_get(struct gpio_chip *chip, unsigned int offset)
256 int port = GPIO_TO_PORT(offset);
257 int gpio = GPIO_TO_GPIO(offset);
258 return ifxmips_port_get_input(port, gpio);
262 ifxmips_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
264 int port = GPIO_TO_PORT(offset);
265 int gpio = GPIO_TO_GPIO(offset);
266 ifxmips_port_set_open_drain(port, gpio);
267 ifxmips_port_clear_altsel0(port, gpio);
268 ifxmips_port_clear_altsel1(port, gpio);
269 ifxmips_port_set_dir_in(port, gpio);
274 ifxmips_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
276 int port = GPIO_TO_PORT(offset);
277 int gpio = GPIO_TO_GPIO(offset);
278 ifxmips_port_clear_open_drain(port, gpio);
279 ifxmips_port_clear_altsel0(port, gpio);
280 ifxmips_port_clear_altsel1(port, gpio);
281 ifxmips_port_set_dir_out(port, gpio);
282 ifxmips_gpio_set(chip, offset, value);
287 gpio_to_irq(unsigned int gpio)
291 EXPORT_SYMBOL(gpio_to_irq);
296 .label = "ifxmips-gpio",
297 .direction_input = ifxmips_gpio_direction_input,
298 .direction_output = ifxmips_gpio_direction_output,
299 .get = ifxmips_gpio_get,
300 .set = ifxmips_gpio_set,
306 ifxmips_gpio_probe(struct platform_device *dev)
308 gpiochip_add(&ifxmips_gpio_chip);
313 ifxmips_gpio_remove(struct platform_device *pdev)
315 gpiochip_remove(&ifxmips_gpio_chip);
319 static struct platform_driver
320 ifxmips_gpio_driver = {
321 .probe = ifxmips_gpio_probe,
322 .remove = ifxmips_gpio_remove,
324 .name = "ifxmips_gpio",
325 .owner = THIS_MODULE,
330 ifxmips_gpio_init(void)
332 int ret = platform_driver_register(&ifxmips_gpio_driver);
334 printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
339 ifxmips_gpio_exit(void)
341 platform_driver_unregister(&ifxmips_gpio_driver);
344 module_init(ifxmips_gpio_init);
345 module_exit(ifxmips_gpio_exit);