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/* -------------------------------------------------------------------- */
/* setup_voyagergx.c: */
/* -------------------------------------------------------------------- */
/* 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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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.
Copyright 2003 (c) Lineo uSolutions,Inc.
*/
/* -------------------------------------------------------------------- */
#undef DEBUG
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/rts7751r2d/rts7751r2d.h>
#include <asm/rts7751r2d/voyagergx_reg.h>
static void disable_voyagergx_irq(unsigned int irq)
{
unsigned long flags, val;
unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
local_irq_save(flags);
val = inl(VOYAGER_INT_MASK);
val &= ~mask;
outl(val, VOYAGER_INT_MASK);
local_irq_restore(flags);
}
static void enable_voyagergx_irq(unsigned int irq)
{
unsigned long flags, val;
unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
local_irq_save(flags);
val = inl(VOYAGER_INT_MASK);
val |= mask;
outl(val, VOYAGER_INT_MASK);
local_irq_restore(flags);
}
static void mask_and_ack_voyagergx(unsigned int irq)
{
disable_voyagergx_irq(irq);
}
static void end_voyagergx_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_voyagergx_irq(irq);
}
static unsigned int startup_voyagergx_irq(unsigned int irq)
{
enable_voyagergx_irq(irq);
return 0;
}
static void shutdown_voyagergx_irq(unsigned int irq)
{
disable_voyagergx_irq(irq);
}
static struct hw_interrupt_type voyagergx_irq_type = {
.typename = "VOYAGERGX-IRQ",
.startup = startup_voyagergx_irq,
.shutdown = shutdown_voyagergx_irq,
.enable = enable_voyagergx_irq,
.disable = disable_voyagergx_irq,
.ack = mask_and_ack_voyagergx,
.end = end_voyagergx_irq,
};
static irqreturn_t voyagergx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_INFO
"VoyagerGX: spurious interrupt, status: 0x%x\n",
inl(INT_STATUS));
return IRQ_HANDLED;
}
/*====================================================*/
static struct {
int (*func)(int, void *);
void *dev;
} voyagergx_demux[VOYAGER_IRQ_NUM];
void voyagergx_register_irq_demux(int irq,
int (*demux)(int irq, void *dev), void *dev)
{
voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = demux;
voyagergx_demux[irq - VOYAGER_IRQ_BASE].dev = dev;
}
void voyagergx_unregister_irq_demux(int irq)
{
voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = 0;
}
int voyagergx_irq_demux(int irq)
{
if (irq == IRQ_VOYAGER ) {
unsigned long i = 0, bit __attribute__ ((unused));
unsigned long val = inl(INT_STATUS);
#if 1
if ( val & ( 1 << 1 )){
i = 1;
} else if ( val & ( 1 << 2 )){
i = 2;
} else if ( val & ( 1 << 6 )){
i = 6;
} else if( val & ( 1 << 10 )){
i = 10;
} else if( val & ( 1 << 11 )){
i = 11;
} else if( val & ( 1 << 12 )){
i = 12;
} else if( val & ( 1 << 17 )){
i = 17;
} else {
printk("Unexpected IRQ irq = %d status = 0x%08lx\n", irq, val);
}
pr_debug("voyagergx_irq_demux %d \n", i);
#else
for (bit = 1, i = 0 ; i < VOYAGER_IRQ_NUM ; bit <<= 1, i++)
if (val & bit)
break;
#endif
if (i < VOYAGER_IRQ_NUM) {
irq = VOYAGER_IRQ_BASE + i;
if (voyagergx_demux[i].func != 0)
irq = voyagergx_demux[i].func(irq, voyagergx_demux[i].dev);
}
}
return irq;
}
static struct irqaction irq0 = {
.name = "voyagergx",
.handler = voyagergx_interrupt,
.flags = SA_INTERRUPT,
.mask = CPU_MASK_NONE,
};
void __init setup_voyagergx_irq(void)
{
int i, flag;
printk(KERN_INFO "VoyagerGX configured at 0x%x on irq %d(mapped into %d to %d)\n",
VOYAGER_BASE,
IRQ_VOYAGER,
VOYAGER_IRQ_BASE,
VOYAGER_IRQ_BASE + VOYAGER_IRQ_NUM - 1);
for (i=0; i<VOYAGER_IRQ_NUM; i++) {
flag = 0;
switch (VOYAGER_IRQ_BASE + i) {
case VOYAGER_USBH_IRQ:
case VOYAGER_8051_IRQ:
case VOYAGER_UART0_IRQ:
case VOYAGER_UART1_IRQ:
case VOYAGER_AC97_IRQ:
flag = 1;
}
if (flag == 1)
irq_desc[VOYAGER_IRQ_BASE + i].chip = &voyagergx_irq_type;
}
setup_irq(IRQ_VOYAGER, &irq0);
}
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