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/*
* 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);
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)) {
gpio->gpioistat = gpio->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) {
ll_timer_interrupt(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);
}
}
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