/*
* BRIEF MODULE DESCRIPTION
* Au1xxx irq map table
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/mach-au1x00/au1000.h>
#ifdef CONFIG_MIPS_PB1200
#include <asm/mach-pb1x00/pb1200.h>
#endif
#ifdef CONFIG_MIPS_DB1200
#include <asm/mach-db1x00/db1200.h>
#define PB1200_INT_BEGIN DB1200_INT_BEGIN
#define PB1200_INT_END DB1200_INT_END
#endif
struct au1xxx_irqmap __initdata au1xxx_irq_map[] = {
{ AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade
};
int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map);
/*
* Support for External interrupts on the PbAu1200 Development platform.
*/
static volatile int pb1200_cascade_en=0;
irqreturn_t pb1200_cascade_handler( int irq, void *dev_id)
{
unsigned short bisr = bcsr->int_status;
int extirq_nr = 0;
/* Clear all the edge interrupts. This has no effect on level */
bcsr->int_status = bisr;
for( ; bisr; bisr &= (bisr-1) )
{
extirq_nr = PB1200_INT_BEGIN + __ffs(bisr);
/* Ack and dispatch IRQ */
do_IRQ(extirq_nr);
}
return IRQ_RETVAL(1);
}
inline void pb1200_enable_irq(unsigned int irq_nr)
{
bcsr->intset_mask = 1<<(irq_nr - PB1200_INT_BEGIN);
bcsr->intset = 1<<(irq_nr - PB1200_INT_BEGIN);
}
inline void pb1200_disable_irq(unsigned int irq_nr)
{
bcsr->intclr_mask = 1<<(irq_nr - PB1200_INT_BEGIN);
bcsr->intclr = 1<<(irq_nr - PB1200_INT_BEGIN);
}
static unsigned int pb1200_setup_cascade(void)
{
int err;
err = request_irq(AU1000_GPIO_7, &pb1200_cascade_handler,
0, "Pb1200 Cascade", &pb1200_cascade_handler);
if (err)
return err;
return 0;
}
static unsigned int pb1200_startup_irq(unsigned int irq)
{
if (++pb1200_cascade_en == 1) {
int res;
res = pb1200_setup_cascade();
if (res)
return res;
}
pb1200_enable_irq(irq);
return 0;
}
static void pb1200_shutdown_irq(unsigned int irq)
{
pb1200_disable_irq(irq);
if (--pb1200_cascade_en == 0)
free_irq(AU1000_GPIO_7, &pb1200_cascade_handler);
}
static struct irq_chip external_irq_type = {
#ifdef CONFIG_MIPS_PB1200
.name = "Pb1200 Ext",
#endif
#ifdef CONFIG_MIPS_DB1200
.name = "Db1200 Ext",
#endif
.startup = pb1200_startup_irq,
.shutdown = pb1200_shutdown_irq,
.ack = pb1200_disable_irq,
.mask = pb1200_disable_irq,
.mask_ack = pb1200_disable_irq,
.unmask = pb1200_enable_irq,
};
void _board_init_irq(void)
{
unsigned int irq;
#ifdef CONFIG_MIPS_PB1200
/* We have a problem with CPLD rev3. Enable a workaround */
if (((bcsr->whoami & BCSR_WHOAMI_CPLD) >> 4) <= 3) {
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("Pb1200 must be at CPLD rev4. Please have Pb1200\n");
printk("updated to latest revision. This software will not\n");
printk("work on anything less than CPLD rev4\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
printk("\nWARNING!!!\n");
panic("Game over. Your score is 0.");
}
#endif
for (irq = PB1200_INT_BEGIN; irq <= PB1200_INT_END; irq++) {
set_irq_chip_and_handler(irq, &external_irq_type,
handle_level_irq);
pb1200_disable_irq(irq);
}
/*
* GPIO_7 can not be hooked here, so it is hooked upon first
* request of any source attached to the cascade
*/
}
