/*
* linux/arch/mps/tx4938/common/irq.c
*
* Common tx4938 irq handler
* Copyright (C) 2000-2001 Toshiba Corporation
*
* 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
* terms of the GNU General Public License version 2. This program is
* licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
*/
#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/irq.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/tx4938/rbtx4938.h>
/**********************************************************************************/
/* Forwad definitions for all pic's */
/**********************************************************************************/
static unsigned int tx4938_irq_cp0_startup(unsigned int irq);
static void tx4938_irq_cp0_shutdown(unsigned int irq);
static void tx4938_irq_cp0_enable(unsigned int irq);
static void tx4938_irq_cp0_disable(unsigned int irq);
static void tx4938_irq_cp0_mask_and_ack(unsigned int irq);
static void tx4938_irq_cp0_end(unsigned int irq);
static unsigned int tx4938_irq_pic_startup(unsigned int irq);
static void tx4938_irq_pic_shutdown(unsigned int irq);
static void tx4938_irq_pic_enable(unsigned int irq);
static void tx4938_irq_pic_disable(unsigned int irq);
static void tx4938_irq_pic_mask_and_ack(unsigned int irq);
static void tx4938_irq_pic_end(unsigned int irq);
/**********************************************************************************/
/* Kernel structs for all pic's */
/**********************************************************************************/
DEFINE_SPINLOCK(tx4938_cp0_lock);
DEFINE_SPINLOCK(tx4938_pic_lock);
#define TX4938_CP0_NAME "TX4938-CP0"
static struct hw_interrupt_type tx4938_irq_cp0_type = {
.typename = TX4938_CP0_NAME,
.startup = tx4938_irq_cp0_startup,
.shutdown = tx4938_irq_cp0_shutdown,
.enable = tx4938_irq_cp0_enable,
.disable = tx4938_irq_cp0_disable,
.ack = tx4938_irq_cp0_mask_and_ack,
.end = tx4938_irq_cp0_end,
.set_affinity = NULL
};
#define TX4938_PIC_NAME "TX4938-PIC"
static struct hw_interrupt_type tx4938_irq_pic_type = {
.typename = TX4938_PIC_NAME,
.startup = tx4938_irq_pic_startup,
.shutdown = tx4938_irq_pic_shutdown,
.enable = tx4938_irq_pic_enable,
.disable = tx4938_irq_pic_disable,
.ack = tx4938_irq_pic_mask_and_ack,
.end = tx4938_irq_pic_end,
.set_affinity = NULL
};
static struct irqaction tx4938_irq_pic_action = {
.handler = no_action,
.flags = 0,
.mask = CPU_MASK_NONE,
.name = TX4938_PIC_NAME
};
/**********************************************************************************/
/* Functions for cp0 */
/**********************************************************************************/
#define tx4938_irq_cp0_mask(irq) ( 1 << ( irq-TX4938_IRQ_CP0_BEG+8 ) )
static void __init
tx4938_irq_cp0_init(void)
{
int i;
for (i = TX4938_IRQ_CP0_BEG; i <= TX4938_IRQ_CP0_END; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 1;
irq_desc[i].handler = &tx4938_irq_cp0_type;
}
return;
}
static unsigned int
tx4938_irq_cp0_startup(unsigned int irq)
{
tx4938_irq_cp0_enable(irq);
return (0);
}
static void
tx4938_irq_cp0_shutdown(unsigned int irq)
{
tx4938_irq_cp0_disable(irq);
}
static void
tx4938_irq_cp0_enable(unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&tx4938_cp0_lock, flags);
set_c0_status(tx4938_irq_cp0_mask(irq));
spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
}
static void
tx4938_irq_cp0_disable(unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&tx4938_cp0_lock, flags);
clear_c0_status(tx4938_irq_cp0_mask(irq));
spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
return;
}
static void
tx4938_irq_cp0_mask_and_ack(unsigned int irq)
{
tx4938_irq_cp0_disable(irq);
return;
}
static void
tx4938_irq_cp0_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
tx4938_irq_cp0_enable(irq);
}
return;
}
/**********************************************************************************/
/* Functions for pic */
/**********************************************************************************/
u32
tx4938_irq_pic_addr(int irq)
{
/* MVMCP -- need to formulize this */
irq -= TX4938_IRQ_PIC_BEG;
switch (irq) {
case 17:
case 16:
case 1:
case 0:{
return (TX4938_MKA(TX4938_IRC_IRLVL0));
}
case 19:
case 18:
case 3:
case 2:{
return (TX4938_MKA(TX4938_IRC_IRLVL1));
}
case 21:
case 20:
case 5:
case 4:{
return (TX4938_MKA(TX4938_IRC_IRLVL2));
}
case 23:
case 22:
case 7:
case 6:{
return (TX4938_MKA(TX4938_IRC_IRLVL3));
}
case 25:
case 24:
case 9:
case 8:{
return (TX4938_MKA(TX4938_IRC_IRLVL4));
}
case 27:
case 26:
case 11:
case 10:{
return (TX4938_MKA(TX4938_IRC_IRLVL5));
}
case 29:
case 28:
case 13:
case 12:{
return (TX4938_MKA(TX4938_IRC_IRLVL6));
}
case 31:
case 30:
case 15:
case 14:{
return (TX4938_MKA(TX4938_IRC_IRLVL7));
}
}
return (0);
}
u32
tx4938_irq_pic_mask(int irq)
{
/* MVMCP -- need to formulize this */
irq -= TX4938_IRQ_PIC_BEG;
switch (irq) {
case 31:
case 29:
case 27:
case 25:
case 23:
case 21:
case 19:
case 17:{
return (0x07000000);
}
case 30:
case 28:
case 26:
case 24:
case 22:
case 20:
case 18:
case 16:{
return (0x00070000);
}
case 15:
case 13:
case 11:
case 9:
case 7:
case 5:
case 3:
case 1:{
return (0x00000700);
}
case 14:
case 12:
case 10:
case 8:
case 6:
case 4:
case 2:
case 0:{
return (0x00000007);
}
}
return (0x00000000);
}
static void
tx4938_irq_pic_modify(unsigned pic_reg, unsigned clr_bits, unsigned set_bits)
{
unsigned long val = 0;
val = TX4938_RD(pic_reg);
val &= (~clr_bits);
val |= (set_bits);
TX4938_WR(pic_reg, val);
mmiowb();
TX4938_RD(pic_reg);
return;
}
static void __init
tx4938_irq_pic_init(void)
{
unsigned long flags;
int i;
for (i = TX4938_IRQ_PIC_BEG; i <= TX4938_IRQ_PIC_END; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 2;
irq_desc[i].handler = &tx4938_irq_pic_type;
}
setup_irq(TX4938_IRQ_NEST_PIC_ON_CP0, &tx4938_irq_pic_action);
spin_lock_irqsave(&tx4938_pic_lock, flags);
TX4938_WR(0xff1ff640, 0x6); /* irq level mask -- only accept hightest */
TX4938_WR(0xff1ff600, TX4938_RD(0xff1ff600) | 0x1); /* irq enable */
spin_unlock_irqrestore(&tx4938_pic_lock, flags);
return;
}
static unsigned int
tx4938_irq_pic_startup(unsigned int irq)
{
tx4938_irq_pic_enable(irq);
return (0);
}
static void
tx4938_irq_pic_shutdown(unsigned int irq)
{
tx4938_irq_pic_disable(irq);
return;
}
static void
tx4938_irq_pic_enable(unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&tx4938_pic_lock, flags);
tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq), 0,
tx4938_irq_pic_mask(irq));
spin_unlock_irqrestore(&tx4938_pic_lock, flags);
return;
}
static void
tx4938_irq_pic_disable(unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&tx4938_pic_lock, flags);
tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq),
tx4938_irq_pic_mask(irq), 0);
spin_unlock_irqrestore(&tx4938_pic_lock, flags);
return;
}
static void
tx4938_irq_pic_mask_and_ack(unsigned int irq)
{
tx4938_irq_pic_disable(irq);
return;
}
static void
tx4938_irq_pic_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
tx4938_irq_pic_enable(irq);
}
return;
}
/**********************************************************************************/
/* Main init functions */
/**********************************************************************************/
void __init
tx4938_irq_init(void)
{
tx4938_irq_cp0_init();
tx4938_irq_pic_init();
return;
}
int
tx4938_irq_nested(void)
{
int sw_irq = 0;
u32 level2;
level2 = TX4938_RD(0xff1ff6a0);
if ((level2 & 0x10000) == 0) {
level2 &= 0x1f;
sw_irq = TX4938_IRQ_PIC_BEG + level2;
if (sw_irq == 26) {
{
extern int toshiba_rbtx4938_irq_nested(int sw_irq);
sw_irq = toshiba_rbtx4938_irq_nested(sw_irq);
}
}
}
wbflush();
return (sw_irq);
}
asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
{
unsigned int pending = read_c0_cause() & read_c0_status();
if (pending & STATUSF_IP7)
do_IRQ(TX4938_IRQ_CPU_TIMER, regs);
else if (pending & STATUSF_IP2) {
int irq = tx4938_irq_nested();
if (irq)
do_IRQ(irq, regs);
else
spurious_interrupt(regs);
} else if (pending & STATUSF_IP1)
do_IRQ(TX4938_IRQ_USER1, regs);
else if (pending & STATUSF_IP0)
do_IRQ(TX4938_IRQ_USER0, regs);
}
