4 * BRIEF MODULE DESCRIPTION
5 * API for ITE GPIO device.
6 * Driver for ITE GPIO device.
8 * Author: MontaVista Software, Inc. <source@mvista.com>
9 * Hai-Pao Fan <haipao@mvista.com>
11 * Copyright 2001 MontaVista Software Inc.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
21 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
24 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/miscdevice.h>
37 #include <linux/init.h>
38 #include <linux/ioport.h>
39 #include <asm/uaccess.h>
40 #include <asm/addrspace.h>
41 #include <asm/it8172/it8172_int.h>
42 #include <linux/sched.h>
43 #include <linux/ite_gpio.h>
45 #define ite_gpio_base 0x14013800
47 #define ITE_GPADR (*(volatile __u8 *)(0x14013800 + KSEG1))
48 #define ITE_GPBDR (*(volatile __u8 *)(0x14013808 + KSEG1))
49 #define ITE_GPCDR (*(volatile __u8 *)(0x14013810 + KSEG1))
50 #define ITE_GPACR (*(volatile __u16 *)(0x14013802 + KSEG1))
51 #define ITE_GPBCR (*(volatile __u16 *)(0x1401380a + KSEG1))
52 #define ITE_GPCCR (*(volatile __u16 *)(0x14013812 + KSEG1))
53 #define ITE_GPAICR (*(volatile __u16 *)(0x14013804 + KSEG1))
54 #define ITE_GPBICR (*(volatile __u16 *)(0x1401380c + KSEG1))
55 #define ITE_GPCICR (*(volatile __u16 *)(0x14013814 + KSEG1))
56 #define ITE_GPAISR (*(volatile __u8 *)(0x14013806 + KSEG1))
57 #define ITE_GPBISR (*(volatile __u8 *)(0x1401380e + KSEG1))
58 #define ITE_GPCISR (*(volatile __u8 *)(0x14013816 + KSEG1))
59 #define ITE_GCR (*(volatile __u8 *)(0x14013818 + KSEG1))
61 #define MAX_GPIO_LINE 21
62 static int ite_gpio_irq=IT8172_GPIO_IRQ;
64 static long ite_irq_counter[MAX_GPIO_LINE];
65 wait_queue_head_t ite_gpio_wait[MAX_GPIO_LINE];
66 static int ite_gpio_irq_pending[MAX_GPIO_LINE];
68 static int ite_gpio_debug=0;
69 #define DEB(x) if (ite_gpio_debug>=1) x
71 int ite_gpio_in(__u32 device, __u32 mask, volatile __u32 *data)
73 DEB(printk("ite_gpio_in mask=0x%x\n",mask));
77 ITE_GPACR = (__u16)mask; /* 0xffff */
81 ITE_GPBCR = (__u16)mask; /* 0xffff */
85 ITE_GPCCR = (__u16)mask; /* 0x03ff */
96 int ite_gpio_out(__u32 device, __u32 mask, __u32 data)
100 ITE_GPACR = (__u16)mask; /* 0x5555 */
101 ITE_GPADR = (__u8)data;
104 ITE_GPBCR = (__u16)mask; /* 0x5555 */
105 ITE_GPBDR = (__u8)data;
108 ITE_GPCCR = (__u16)mask; /* 0x0155 */
109 ITE_GPCDR = (__u8)data;
118 int ite_gpio_int_ctrl(__u32 device, __u32 mask, __u32 data)
122 ITE_GPAICR = (ITE_GPAICR & ~mask) | (data & mask);
125 ITE_GPBICR = (ITE_GPBICR & ~mask) | (data & mask);
128 ITE_GPCICR = (ITE_GPCICR & ~mask) | (data & mask);
137 int ite_gpio_in_status(__u32 device, __u32 mask, volatile __u32 *data)
141 if ((MAX_GPIO_LINE > *data) && (*data >= 0))
142 ret=ite_gpio_irq_pending[*data];
144 DEB(printk("ite_gpio_in_status %d ret=%d\n",*data, ret));
148 *data = ITE_GPAISR & mask;
151 *data = ITE_GPBISR & mask;
154 *data = ITE_GPCISR & mask;
163 int ite_gpio_out_status(__u32 device, __u32 mask, __u32 data)
167 ITE_GPAISR = (ITE_GPAISR & ~mask) | (data & mask);
170 ITE_GPBISR = (ITE_GPBISR & ~mask) | (data & mask);
173 ITE_GPCISR = (ITE_GPCISR & ~mask) | (data & mask);
182 int ite_gpio_gen_ctrl(__u32 device, __u32 mask, __u32 data)
184 ITE_GCR = (ITE_GCR & ~mask) | (data & mask);
189 int ite_gpio_int_wait (__u32 device, __u32 mask, __u32 data)
199 line = (data & mask) <<8;
202 line = (data & mask) <<16;
205 for (i=MAX_GPIO_LINE-1; i >= 0; i--) {
206 if ( (line) & (1 << i))
210 DEB(printk("wait device=0x%d mask=0x%x data=0x%x index %d\n",
211 device, mask, data, i));
216 if (ite_gpio_irq_pending[i]==1)
221 ite_gpio_irq_pending[i] = 1;
222 ret = interruptible_sleep_on_timeout(&ite_gpio_wait[i], 3*HZ);
223 restore_flags (flags);
224 ite_gpio_irq_pending[i] = 0;
229 EXPORT_SYMBOL(ite_gpio_in);
230 EXPORT_SYMBOL(ite_gpio_out);
231 EXPORT_SYMBOL(ite_gpio_int_ctrl);
232 EXPORT_SYMBOL(ite_gpio_in_status);
233 EXPORT_SYMBOL(ite_gpio_out_status);
234 EXPORT_SYMBOL(ite_gpio_gen_ctrl);
235 EXPORT_SYMBOL(ite_gpio_int_wait);
237 static int ite_gpio_open(struct inode *inode, struct file *file)
243 static int ite_gpio_release(struct inode *inode, struct file *file)
249 static int ite_gpio_ioctl(struct inode *inode, struct file *file,
250 unsigned int cmd, unsigned long arg)
252 static struct ite_gpio_ioctl_data ioctl_data;
254 if (copy_from_user(&ioctl_data, (struct ite_gpio_ioctl_data *)arg,
257 if ((ioctl_data.device < ITE_GPIO_PORTA) ||
258 (ioctl_data.device > ITE_GPIO_PORTC) )
263 if (ite_gpio_in(ioctl_data.device, ioctl_data.mask,
267 if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
268 &ioctl_data, sizeof(ioctl_data)))
273 return ite_gpio_out(ioctl_data.device,
274 ioctl_data.mask, ioctl_data.data);
277 case ITE_GPIO_INT_CTRL:
278 return ite_gpio_int_ctrl(ioctl_data.device,
279 ioctl_data.mask, ioctl_data.data);
282 case ITE_GPIO_IN_STATUS:
283 if (ite_gpio_in_status(ioctl_data.device, ioctl_data.mask,
286 if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
287 &ioctl_data, sizeof(ioctl_data)))
291 case ITE_GPIO_OUT_STATUS:
292 return ite_gpio_out_status(ioctl_data.device,
293 ioctl_data.mask, ioctl_data.data);
296 case ITE_GPIO_GEN_CTRL:
297 return ite_gpio_gen_ctrl(ioctl_data.device,
298 ioctl_data.mask, ioctl_data.data);
301 case ITE_GPIO_INT_WAIT:
302 return ite_gpio_int_wait(ioctl_data.device,
303 ioctl_data.mask, ioctl_data.data);
314 static void ite_gpio_irq_handler(int this_irq, void *dev_id,
315 struct pt_regs *regs)
319 line = ITE_GPCISR & 0x1f;
320 for (i=4; i >=0; i--) {
321 if ( line & (1 << i)) {
322 ++ite_irq_counter[i+16];
323 ite_gpio_irq_pending[i+16] = 2;
324 wake_up_interruptible(&ite_gpio_wait[i+16]);
326 DEB(printk("interrupt 0x%x %d\n", &ite_gpio_wait[i+16], i+16));
328 ITE_GPCISR = ITE_GPCISR & (1<<i);
333 for (i=7; i >= 0; i--) {
334 if ( line & (1 << i)) {
335 ++ite_irq_counter[i+8];
336 ite_gpio_irq_pending[i+8] = 2;
337 wake_up_interruptible(&ite_gpio_wait[i+8]);
339 DEB(printk("interrupt 0x%x %d\n",ITE_GPBISR, i+8));
341 ITE_GPBISR = ITE_GPBISR & (1<<i);
346 for (i=7; i >= 0; i--) {
347 if ( line & (1 << i)) {
348 ++ite_irq_counter[i];
349 ite_gpio_irq_pending[i] = 2;
350 wake_up_interruptible(&ite_gpio_wait[i]);
352 DEB(printk("interrupt 0x%x %d\n",ITE_GPAISR, i));
354 ITE_GPAISR = ITE_GPAISR & (1<<i);
360 static const struct file_operations ite_gpio_fops = {
361 .owner = THIS_MODULE,
362 .ioctl = ite_gpio_ioctl,
363 .open = ite_gpio_open,
364 .release = ite_gpio_release,
367 static struct miscdevice ite_gpio_miscdev = {
373 int __init ite_gpio_init(void)
377 if (misc_register(&ite_gpio_miscdev))
380 if (!request_region(ite_gpio_base, 0x1c, "ITE GPIO"))
382 misc_deregister(&ite_gpio_miscdev);
386 /* initialize registers */
395 for (i = 0; i < MAX_GPIO_LINE; i++) {
396 ite_gpio_irq_pending[i]=0;
397 init_waitqueue_head(&ite_gpio_wait[i]);
400 if (request_irq(ite_gpio_irq, ite_gpio_irq_handler, IRQF_SHARED, "gpio", 0) < 0) {
401 misc_deregister(&ite_gpio_miscdev);
402 release_region(ite_gpio_base, 0x1c);
406 printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq);
411 static void __exit ite_gpio_exit(void)
413 misc_deregister(&ite_gpio_miscdev);
416 module_init(ite_gpio_init);
417 module_exit(ite_gpio_exit);
419 MODULE_LICENSE("GPL");