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/*
* BRIEF MODULE DESCRIPTION
* ITE 8172G interrupt/setup routines.
*
* Copyright 2000,2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ppopov@mvista.com or source@mvista.com
*
* Part of this file was derived from Carsten Langgaard's
* arch/mips/mips-boards/atlas/atlas_int.c.
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* 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/serial_reg.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/it8172/it8172.h>
#include <asm/it8172/it8172_int.h>
#include <asm/it8172/it8172_dbg.h>
/* revisit */
#define EXT_IRQ0_TO_IP 2 /* IP 2 */
#define EXT_IRQ5_TO_IP 7 /* IP 7 */
#define ALLINTS_NOTIMER (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4)
extern void set_debug_traps(void);
extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
struct it8172_intc_regs volatile *it8172_hw0_icregs =
(struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
static void disable_it8172_irq(unsigned int irq_nr)
{
if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
/* LPC interrupt */
it8172_hw0_icregs->lpc_mask |=
(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
} else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
/* Local Bus interrupt */
it8172_hw0_icregs->lb_mask |=
(1 << (irq_nr - IT8172_LB_IRQ_BASE));
} else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
/* PCI and other interrupts */
it8172_hw0_icregs->pci_mask |=
(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
} else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
/* NMI interrupts */
it8172_hw0_icregs->nmi_mask |=
(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
} else {
panic("disable_it8172_irq: bad irq %d", irq_nr);
}
}
static void enable_it8172_irq(unsigned int irq_nr)
{
if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
/* LPC interrupt */
it8172_hw0_icregs->lpc_mask &=
~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
/* Local Bus interrupt */
it8172_hw0_icregs->lb_mask &=
~(1 << (irq_nr - IT8172_LB_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
/* PCI and other interrupts */
it8172_hw0_icregs->pci_mask &=
~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
}
else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
/* NMI interrupts */
it8172_hw0_icregs->nmi_mask &=
~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
}
else {
panic("enable_it8172_irq: bad irq %d", irq_nr);
}
}
static unsigned int startup_ite_irq(unsigned int irq)
{
enable_it8172_irq(irq);
return 0;
}
#define shutdown_ite_irq disable_it8172_irq
#define mask_and_ack_ite_irq disable_it8172_irq
static void end_ite_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_it8172_irq(irq);
}
static struct irq_chip it8172_irq_type = {
.typename = "ITE8172",
.startup = startup_ite_irq,
.shutdown = shutdown_ite_irq,
.enable = enable_it8172_irq,
.disable = disable_it8172_irq,
.ack = mask_and_ack_ite_irq,
.end = end_ite_irq,
};
static void enable_none(unsigned int irq) { }
static unsigned int startup_none(unsigned int irq) { return 0; }
static void disable_none(unsigned int irq) { }
static void ack_none(unsigned int irq) { }
/* startup is the same as "enable", shutdown is same as "disable" */
#define shutdown_none disable_none
#define end_none enable_none
static struct irq_chip cp0_irq_type = {
.typename = "CP0 Count",
.startup = startup_none,
.shutdown = shutdown_none,
.enable = enable_none,
.disable = disable_none,
.ack = ack_none,
.end = end_none
};
void enable_cpu_timer(void)
{
unsigned long flags;
local_irq_save(flags);
set_c0_status(0x100 << EXT_IRQ5_TO_IP);
local_irq_restore(flags);
}
void __init arch_init_irq(void)
{
int i;
unsigned long flags;
/* mask all interrupts */
it8172_hw0_icregs->lb_mask = 0xffff;
it8172_hw0_icregs->lpc_mask = 0xffff;
it8172_hw0_icregs->pci_mask = 0xffff;
it8172_hw0_icregs->nmi_mask = 0xffff;
/* make all interrupts level triggered */
it8172_hw0_icregs->lb_trigger = 0;
it8172_hw0_icregs->lpc_trigger = 0;
it8172_hw0_icregs->pci_trigger = 0;
it8172_hw0_icregs->nmi_trigger = 0;
/* active level setting */
/* uart, keyboard, and mouse are active high */
it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000);
it8172_hw0_icregs->lb_level |= 0x20;
/* keyboard and mouse are edge triggered */
it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
#if 0
// Enable this piece of code to make internal USB interrupt
// edge triggered.
it8172_hw0_icregs->pci_trigger |=
(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
it8172_hw0_icregs->pci_level &=
~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
#endif
for (i = 0; i <= IT8172_LAST_IRQ; i++) {
irq_desc[i].chip = &it8172_irq_type;
spin_lock_init(&irq_desc[i].lock);
}
irq_desc[MIPS_CPU_TIMER_IRQ].chip = &cp0_irq_type;
set_c0_status(ALLINTS_NOTIMER);
}
void mips_spurious_interrupt(struct pt_regs *regs)
{
#if 1
return;
#else
unsigned long status, cause;
printk("got spurious interrupt\n");
status = read_c0_status();
cause = read_c0_cause();
printk("status %x cause %x\n", status, cause);
printk("epc %x badvaddr %x \n", regs->cp0_epc, regs->cp0_badvaddr);
#endif
}
void it8172_hw0_irqdispatch(struct pt_regs *regs)
{
int irq;
unsigned short intstatus = 0, status = 0;
intstatus = it8172_hw0_icregs->intstatus;
if (intstatus & 0x8) {
panic("Got NMI interrupt");
} else if (intstatus & 0x4) {
/* PCI interrupt */
irq = 0;
status |= it8172_hw0_icregs->pci_req;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_PCI_DEV_IRQ_BASE;
} else if (intstatus & 0x1) {
/* Local Bus interrupt */
irq = 0;
status |= it8172_hw0_icregs->lb_req;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_LB_IRQ_BASE;
} else if (intstatus & 0x2) {
/* LPC interrupt */
/* Since some lpc interrupts are edge triggered,
* we could lose an interrupt this way because
* we acknowledge all ints at onces. Revisit.
*/
status |= it8172_hw0_icregs->lpc_req;
it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
irq = 0;
while (!(status & 0x1)) {
irq++;
status >>= 1;
}
irq += IT8172_LPC_IRQ_BASE;
} else
return;
do_IRQ(irq, regs);
}
asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
{
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
if (!pending)
mips_spurious_interrupt(regs);
else if (pending & CAUSEF_IP7)
ll_timer_interrupt(127, regs);
else if (pending & CAUSEF_IP2)
it8172_hw0_irqdispatch(regs);
}
void show_pending_irqs(void)
{
fputs("intstatus: ");
put32(it8172_hw0_icregs->intstatus);
puts("");
fputs("pci_req: ");
put32(it8172_hw0_icregs->pci_req);
puts("");
fputs("lb_req: ");
put32(it8172_hw0_icregs->lb_req);
puts("");
fputs("lpc_req: ");
put32(it8172_hw0_icregs->lpc_req);
puts("");
}
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