183 lines
4.9 KiB
C
183 lines
4.9 KiB
C
/*
|
|
* 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/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/types.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/system.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
|
|
*/
|
|
}
|