265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/*
|
|
* BRIEF MODULE DESCRIPTION
|
|
* RC32434 interrupt routines.
|
|
*
|
|
* Copyright 2002 MontaVista Software Inc.
|
|
* Author: MontaVista Software, Inc.
|
|
* stevel@mvista.com or source@mvista.com
|
|
*
|
|
* 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/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 <asm/bitops.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/time.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/system.h>
|
|
#include <asm/rc32434/rc32434.h>
|
|
#include <asm/rc32434/gpio.h>
|
|
|
|
extern void set_debug_traps(void);
|
|
extern irq_cpustat_t irq_stat [NR_CPUS];
|
|
unsigned int local_bh_count[NR_CPUS];
|
|
unsigned int local_irq_count[NR_CPUS];
|
|
|
|
static unsigned int startup_irq(unsigned int irq);
|
|
static void rb500_end_irq(unsigned int irq_nr);
|
|
static void mask_and_ack_irq(unsigned int irq_nr);
|
|
static void rb500_enable_irq(unsigned int irq_nr);
|
|
static void rb500_disable_irq(unsigned int irq_nr);
|
|
|
|
extern void __init init_generic_irq(void);
|
|
extern struct rb500_gpio_reg __iomem *rb500_gpio_reg0;
|
|
|
|
typedef struct {
|
|
u32 mask; /* mask of valid bits in pending/mask registers */
|
|
volatile u32 *base_addr;
|
|
} intr_group_t;
|
|
|
|
#define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32)
|
|
|
|
#if (NR_IRQS < RC32434_NR_IRQS)
|
|
#error Too little irqs defined. Did you override <asm/irq.h> ?
|
|
#endif
|
|
|
|
static const intr_group_t intr_group[NUM_INTR_GROUPS] = {
|
|
{ 0x0000efff, (u32 *)KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET) },
|
|
{ 0x00001fff, (u32 *)KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET) },
|
|
{ 0x00000007, (u32 *)KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET) },
|
|
{ 0x0003ffff, (u32 *)KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET) },
|
|
{ 0xffffffff, (u32 *)KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET) }
|
|
};
|
|
|
|
#define READ_PEND(base) (*(base))
|
|
#define READ_MASK(base) (*(base + 2))
|
|
#define WRITE_MASK(base, val) (*(base + 2) = (val))
|
|
|
|
static inline int irq_to_group(unsigned int irq_nr)
|
|
{
|
|
return ((irq_nr - GROUP0_IRQ_BASE) >> 5);
|
|
}
|
|
|
|
static inline int group_to_ip(unsigned int group)
|
|
{
|
|
return group + 2;
|
|
}
|
|
|
|
static inline void enable_local_irq(unsigned int ip)
|
|
{
|
|
int ipnum = 0x100 << ip;
|
|
clear_c0_cause(ipnum);
|
|
set_c0_status(ipnum);
|
|
}
|
|
|
|
static inline void disable_local_irq(unsigned int ip)
|
|
{
|
|
int ipnum = 0x100 << ip;
|
|
clear_c0_status(ipnum);
|
|
}
|
|
|
|
static inline void ack_local_irq(unsigned int ip)
|
|
{
|
|
int ipnum = 0x100 << ip;
|
|
clear_c0_cause(ipnum);
|
|
}
|
|
|
|
static void rb500_enable_irq(unsigned int irq_nr)
|
|
{
|
|
int ip = irq_nr - GROUP0_IRQ_BASE;
|
|
unsigned int group, intr_bit;
|
|
volatile unsigned int *addr;
|
|
|
|
|
|
if (ip < 0)
|
|
enable_local_irq(irq_nr);
|
|
else {
|
|
group = ip >> 5;
|
|
|
|
ip &= (1<<5)-1;
|
|
intr_bit = 1 << ip;
|
|
|
|
enable_local_irq(group_to_ip(group));
|
|
|
|
addr = intr_group[group].base_addr;
|
|
WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit);
|
|
}
|
|
}
|
|
|
|
static void rb500_disable_irq(unsigned int irq_nr)
|
|
{
|
|
int ip = irq_nr - GROUP0_IRQ_BASE;
|
|
unsigned int group, intr_bit, mask;
|
|
volatile unsigned int *addr;
|
|
|
|
if (ip < 0) {
|
|
disable_local_irq(irq_nr);
|
|
}else{
|
|
group = ip >> 5;
|
|
|
|
ip &= (1<<5) -1;
|
|
intr_bit = 1 << ip;
|
|
addr = intr_group[group].base_addr;
|
|
mask = READ_MASK(addr);
|
|
mask |= intr_bit;
|
|
WRITE_MASK(addr,mask);
|
|
|
|
/*
|
|
* if there are no more interrupts enabled in this
|
|
* group, disable corresponding IP
|
|
*/
|
|
if (mask == intr_group[group].mask)
|
|
disable_local_irq(group_to_ip(group));
|
|
}
|
|
}
|
|
|
|
static unsigned int startup_irq(unsigned int irq_nr)
|
|
{
|
|
rb500_enable_irq(irq_nr);
|
|
return 0;
|
|
}
|
|
|
|
static void shutdown_irq(unsigned int irq_nr)
|
|
{
|
|
rb500_disable_irq(irq_nr);
|
|
return;
|
|
}
|
|
|
|
static void mask_and_ack_irq(unsigned int irq_nr)
|
|
{
|
|
rb500_disable_irq(irq_nr);
|
|
ack_local_irq(group_to_ip(irq_to_group(irq_nr)));
|
|
}
|
|
|
|
static void rb500_end_irq(unsigned int irq_nr)
|
|
{
|
|
|
|
int ip = irq_nr - GROUP0_IRQ_BASE;
|
|
unsigned int intr_bit, group;
|
|
volatile unsigned int *addr;
|
|
|
|
if ((irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
|
|
printk("warning: end_irq %d did not enable (%x)\n",
|
|
irq_nr, irq_desc[irq_nr].status);
|
|
return;
|
|
}
|
|
|
|
if (ip < 0) {
|
|
enable_local_irq(irq_nr);
|
|
} else {
|
|
group = ip >> 5;
|
|
|
|
ip &= (1 << 5) - 1;
|
|
intr_bit = 1 << ip;
|
|
|
|
if (irq_nr >= GROUP4_IRQ_BASE && irq_nr <= (GROUP4_IRQ_BASE + 13)) {
|
|
rb500_gpio_reg0->gpioistat = rb500_gpio_reg0->gpioistat & ~intr_bit;
|
|
}
|
|
|
|
enable_local_irq(group_to_ip(group));
|
|
|
|
addr = intr_group[group].base_addr;
|
|
WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit);
|
|
}
|
|
}
|
|
|
|
static struct hw_interrupt_type rc32434_irq_type = {
|
|
.typename = "RB500",
|
|
.startup = startup_irq,
|
|
.shutdown = shutdown_irq,
|
|
.enable = rb500_enable_irq,
|
|
.disable = rb500_disable_irq,
|
|
.ack = mask_and_ack_irq,
|
|
.end = rb500_end_irq,
|
|
};
|
|
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
int i;
|
|
|
|
printk("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
|
|
memset(irq_desc, 0, sizeof(irq_desc));
|
|
|
|
for (i = 0; i < RC32434_NR_IRQS; i++) {
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
irq_desc[i].action = NULL;
|
|
irq_desc[i].depth = 1;
|
|
irq_desc[i].chip = &rc32434_irq_type;
|
|
spin_lock_init(&irq_desc[i].lock);
|
|
}
|
|
}
|
|
|
|
/* Main Interrupt dispatcher */
|
|
asmlinkage void plat_irq_dispatch(void)
|
|
{
|
|
unsigned int ip, pend, group;
|
|
volatile unsigned int *addr;
|
|
unsigned int cp0_cause = read_c0_cause() & read_c0_status();
|
|
|
|
if (cp0_cause & CAUSEF_IP7) {
|
|
do_IRQ(7);
|
|
} else if ((ip = (cp0_cause & 0x7c00))) {
|
|
group = 21 - rc32434_clz(ip);
|
|
|
|
addr = intr_group[group].base_addr;
|
|
|
|
pend = READ_PEND(addr);
|
|
pend &= ~READ_MASK(addr); // only unmasked interrupts
|
|
pend = 39 - rc32434_clz(pend);
|
|
do_IRQ((group << 5) + pend);
|
|
}
|
|
}
|