Merge git://git.infradead.org/mtd-2.6
[linux-2.6.git] / arch / mips / bcm47xx / gpio.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
7  */
8
9 #include <linux/ssb/ssb.h>
10 #include <linux/ssb/ssb_driver_chipcommon.h>
11 #include <linux/ssb/ssb_driver_extif.h>
12 #include <asm/mach-bcm47xx/bcm47xx.h>
13 #include <asm/mach-bcm47xx/gpio.h>
14
15 #if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
16 static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
17 #else
18 static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
19 #endif
20
21 int gpio_request(unsigned gpio, const char *tag)
22 {
23         if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
24             ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
25                 return -EINVAL;
26
27         if (ssb_extif_available(&ssb_bcm47xx.extif) &&
28             ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
29                 return -EINVAL;
30
31         if (test_and_set_bit(gpio, gpio_in_use))
32                 return -EBUSY;
33
34         return 0;
35 }
36 EXPORT_SYMBOL(gpio_request);
37
38 void gpio_free(unsigned gpio)
39 {
40         if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
41             ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
42                 return;
43
44         if (ssb_extif_available(&ssb_bcm47xx.extif) &&
45             ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
46                 return;
47
48         clear_bit(gpio, gpio_in_use);
49 }
50 EXPORT_SYMBOL(gpio_free);
51
52 int gpio_to_irq(unsigned gpio)
53 {
54         if (ssb_chipco_available(&ssb_bcm47xx.chipco))
55                 return ssb_mips_irq(ssb_bcm47xx.chipco.dev) + 2;
56         else if (ssb_extif_available(&ssb_bcm47xx.extif))
57                 return ssb_mips_irq(ssb_bcm47xx.extif.dev) + 2;
58         else
59                 return -EINVAL;
60 }
61 EXPORT_SYMBOL_GPL(gpio_to_irq);
62