linux/arch/mips/bcm47xx/gpio.c
Hauke Mehrtens 08ccf57283 bcm47xx: prepare to support different buses
Prepare bcm47xx to support different System buses. Before adding
support for bcma it should be possible to build bcm47xx without the
need of ssb. With this patch bcm47xx does not directly contain a
ssb_bus, but a union contain all the supported system buses. As a SoC
just uses one system bus a union is a good choice.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:29:30 -04:00

73 lines
1.9 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
*/
#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_driver_chipcommon.h>
#include <linux/ssb/ssb_driver_extif.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
#include <asm/mach-bcm47xx/gpio.h>
#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
#else
static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
#endif
int gpio_request(unsigned gpio, const char *tag)
{
switch (bcm47xx_bus_type) {
case BCM47XX_BUS_TYPE_SSB:
if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
return -EINVAL;
if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
return -EINVAL;
if (test_and_set_bit(gpio, gpio_in_use))
return -EBUSY;
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned gpio)
{
switch (bcm47xx_bus_type) {
case BCM47XX_BUS_TYPE_SSB:
if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
return;
if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
return;
clear_bit(gpio, gpio_in_use);
return;
}
}
EXPORT_SYMBOL(gpio_free);
int gpio_to_irq(unsigned gpio)
{
switch (bcm47xx_bus_type) {
case BCM47XX_BUS_TYPE_SSB:
if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
else
return -EINVAL;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(gpio_to_irq);