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[MIPS] Add GT641xx IRQ routines. 

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Yoichi Yuasa 2007-09-13 23:51:26 +09:00 committed by Ralf Baechle
parent 718f05f6dd
commit d5ab1a6910
11 changed files with 307 additions and 135 deletions
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4
arch/mips/Kconfig
View File

@ -64,6 +64,7 @@ config MIPS_COBALT
select HW_HAS_PCI
select I8259
select IRQ_CPU
select IRQ_GT641XX
select PCI_GT64XXX_PCI0
select SYS_HAS_CPU_NEVADA
select SYS_HAS_EARLY_PRINTK
@ -806,6 +807,9 @@ config IRQ_MSP_CIC
config IRQ_TXX9
bool
config IRQ_GT641XX
bool
config MIPS_BOARDS_GEN
bool

118
arch/mips/cobalt/irq.c
View File

@ -15,104 +15,48 @@
#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/irq_gt641xx.h>
#include <asm/gt64120.h>
#include <cobalt.h>
/*
* We have two types of interrupts that we handle, ones that come in through
* the CPU interrupt lines, and ones that come in on the via chip. The CPU
* mappings are:
*
* 16 - Software interrupt 0 (unused) IE_SW0
* 17 - Software interrupt 1 (unused) IE_SW1
* 18 - Galileo chip (timer) IE_IRQ0
* 19 - Tulip 0 + NCR SCSI IE_IRQ1
* 20 - Tulip 1 IE_IRQ2
* 21 - 16550 UART IE_IRQ3
* 22 - VIA southbridge PIC IE_IRQ4
* 23 - unused IE_IRQ5
*
* The VIA chip is a master/slave 8259 setup and has the following interrupts:
*
* 8 - RTC
* 9 - PCI
* 14 - IDE0
* 15 - IDE1
*/
static inline void galileo_irq(void)
{
unsigned int mask, pending, devfn;
mask = GT_READ(GT_INTRMASK_OFS);
pending = GT_READ(GT_INTRCAUSE_OFS) & mask;
if (pending & GT_INTR_T0EXP_MSK) {
GT_WRITE(GT_INTRCAUSE_OFS, ~GT_INTR_T0EXP_MSK);
do_IRQ(COBALT_GALILEO_IRQ);
} else if (pending & GT_INTR_RETRYCTR0_MSK) {
devfn = GT_READ(GT_PCI0_CFGADDR_OFS) >> 8;
GT_WRITE(GT_INTRCAUSE_OFS, ~GT_INTR_RETRYCTR0_MSK);
printk(KERN_WARNING
"Galileo: PCI retry count exceeded (%02x.%u)\n",
PCI_SLOT(devfn), PCI_FUNC(devfn));
} else {
GT_WRITE(GT_INTRMASK_OFS, mask & ~pending);
printk(KERN_WARNING
"Galileo: masking unexpected interrupt %08x\n", pending);
}
}
static inline void via_pic_irq(void)
{
int irq;
irq = i8259_irq();
if (irq >= 0)
do_IRQ(irq);
}
#include <irq.h>
asmlinkage void plat_irq_dispatch(void)
{
unsigned pending = read_c0_status() & read_c0_cause();
unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;
int irq;
if (pending & CAUSEF_IP2) /* COBALT_GALILEO_IRQ (18) */
galileo_irq();
else if (pending & CAUSEF_IP6) /* COBALT_VIA_IRQ (22) */
via_pic_irq();
else if (pending & CAUSEF_IP3) /* COBALT_ETH0_IRQ (19) */
do_IRQ(COBALT_CPU_IRQ + 3);
else if (pending & CAUSEF_IP4) /* COBALT_ETH1_IRQ (20) */
do_IRQ(COBALT_CPU_IRQ + 4);
else if (pending & CAUSEF_IP5) /* COBALT_SERIAL_IRQ (21) */
do_IRQ(COBALT_CPU_IRQ + 5);
else if (pending & CAUSEF_IP7) /* IRQ 23 */
do_IRQ(COBALT_CPU_IRQ + 7);
if (pending & CAUSEF_IP2)
gt641xx_irq_dispatch();
else if (pending & CAUSEF_IP6) {
irq = i8259_irq();
if (irq < 0)
spurious_interrupt();
else
do_IRQ(irq);
} else if (pending & CAUSEF_IP3)
do_IRQ(MIPS_CPU_IRQ_BASE + 3);
else if (pending & CAUSEF_IP4)
do_IRQ(MIPS_CPU_IRQ_BASE + 4);
else if (pending & CAUSEF_IP5)
do_IRQ(MIPS_CPU_IRQ_BASE + 5);
else if (pending & CAUSEF_IP7)
do_IRQ(MIPS_CPU_IRQ_BASE + 7);
else
spurious_interrupt();
}
static struct irqaction irq_via = {
.handler = no_action,
.mask = CPU_MASK_NONE,
.name = "cascade"
static struct irqaction cascade = {
.handler = no_action,
.mask = CPU_MASK_NONE,
.name = "cascade",
};
void __init arch_init_irq(void)
{
/*
* Mask all Galileo interrupts. The Galileo
* handler is set in cobalt_timer_setup()
*/
GT_WRITE(GT_INTRMASK_OFS, 0);
mips_cpu_irq_init();
gt641xx_irq_init();
init_i8259_irqs();
init_i8259_irqs(); /* 0 ... 15 */
mips_cpu_irq_init(); /* 16 ... 23 */
/*
* Mask all cpu interrupts
* (except IE4, we already masked those at VIA level)
*/
change_c0_status(ST0_IM, IE_IRQ4);
setup_irq(COBALT_VIA_IRQ, &irq_via);
setup_irq(GT641XX_CASCADE_IRQ, &cascade);
setup_irq(I8259_CASCADE_IRQ, &cascade);
}

5
arch/mips/cobalt/rtc.c
View File

@ -20,6 +20,7 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/mc146818rtc.h>
#include <linux/platform_device.h>
static struct resource cobalt_rtc_resource[] __initdata = {
@ -29,8 +30,8 @@ static struct resource cobalt_rtc_resource[] __initdata = {
.flags = IORESOURCE_IO,
},
{
.start = 8,
.end = 8,
.start = RTC_IRQ,
.end = RTC_IRQ,
.flags = IORESOURCE_IRQ,
},
};

7
arch/mips/cobalt/serial.c
View File

@ -24,6 +24,7 @@
#include <linux/serial_8250.h>
#include <cobalt.h>
#include <irq.h>
static struct resource cobalt_uart_resource[] __initdata = {
{
@ -32,15 +33,15 @@ static struct resource cobalt_uart_resource[] __initdata = {
.flags = IORESOURCE_MEM,
},
{
.start = COBALT_SERIAL_IRQ,
.end = COBALT_SERIAL_IRQ,
.start = SERIAL_IRQ,
.end = SERIAL_IRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct plat_serial8250_port cobalt_serial8250_port[] = {
{
.irq = COBALT_SERIAL_IRQ,
.irq = SERIAL_IRQ,
.uartclk = 18432000,
.iotype = UPIO_MEM,
.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,

9
arch/mips/cobalt/setup.c
View File

@ -20,6 +20,7 @@
#include <asm/gt64120.h>
#include <cobalt.h>
#include <irq.h>
extern void cobalt_machine_restart(char *command);
extern void cobalt_machine_halt(void);
@ -45,14 +46,10 @@ void __init plat_timer_setup(struct irqaction *irq)
/* Load timer value for HZ (TCLK is 50MHz) */
GT_WRITE(GT_TC0_OFS, 50*1000*1000 / HZ);
/* Enable timer */
/* Enable timer0 */
GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
/* Register interrupt */
setup_irq(COBALT_GALILEO_IRQ, irq);
/* Enable interrupt */
GT_WRITE(GT_INTRMASK_OFS, GT_INTR_T0EXP_MSK | GT_READ(GT_INTRMASK_OFS));
setup_irq(GT641XX_TIMER0_IRQ, irq);
}
/*

1
arch/mips/kernel/Makefile
View File

@ -51,6 +51,7 @@ obj-$(CONFIG_IRQ_CPU_RM7K) += irq-rm7000.o
obj-$(CONFIG_IRQ_CPU_RM9K) += irq-rm9000.o
obj-$(CONFIG_MIPS_BOARDS_GEN) += irq-msc01.o
obj-$(CONFIG_IRQ_TXX9) += irq_txx9.o
obj-$(CONFIG_IRQ_GT641XX) += irq-gt641xx.o
obj-$(CONFIG_32BIT) += scall32-o32.o
obj-$(CONFIG_64BIT) += scall64-64.o

131
arch/mips/kernel/irq-gt641xx.c Normal file
View File

@ -0,0 +1,131 @@
/*
* GT641xx IRQ routines.
*
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <asm/gt64120.h>
#define GT641XX_IRQ_TO_BIT(irq) (1U << (irq - GT641XX_IRQ_BASE))
static DEFINE_SPINLOCK(gt641xx_irq_lock);
static void ack_gt641xx_irq(unsigned int irq)
{
unsigned long flags;
u32 cause;
spin_lock_irqsave(&gt641xx_irq_lock, flags);
cause = GT_READ(GT_INTRCAUSE_OFS);
cause &= ~GT641XX_IRQ_TO_BIT(irq);
GT_WRITE(GT_INTRCAUSE_OFS, cause);
spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
}
static void mask_gt641xx_irq(unsigned int irq)
{
unsigned long flags;
u32 mask;
spin_lock_irqsave(&gt641xx_irq_lock, flags);
mask = GT_READ(GT_INTRMASK_OFS);
mask &= ~GT641XX_IRQ_TO_BIT(irq);
GT_WRITE(GT_INTRMASK_OFS, mask);
spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
}
static void mask_ack_gt641xx_irq(unsigned int irq)
{
unsigned long flags;
u32 cause, mask;
spin_lock_irqsave(&gt641xx_irq_lock, flags);
mask = GT_READ(GT_INTRMASK_OFS);
mask &= ~GT641XX_IRQ_TO_BIT(irq);
GT_WRITE(GT_INTRMASK_OFS, mask);
cause = GT_READ(GT_INTRCAUSE_OFS);
cause &= ~GT641XX_IRQ_TO_BIT(irq);
GT_WRITE(GT_INTRCAUSE_OFS, cause);
spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
}
static void unmask_gt641xx_irq(unsigned int irq)
{
unsigned long flags;
u32 mask;
spin_lock_irqsave(&gt641xx_irq_lock, flags);
mask = GT_READ(GT_INTRMASK_OFS);
mask |= GT641XX_IRQ_TO_BIT(irq);
GT_WRITE(GT_INTRMASK_OFS, mask);
spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
}
static struct irq_chip gt641xx_irq_chip = {
.name = "GT641xx",
.ack = ack_gt641xx_irq,
.mask = mask_gt641xx_irq,
.mask_ack = mask_ack_gt641xx_irq,
.unmask = unmask_gt641xx_irq,
};
void gt641xx_irq_dispatch(void)
{
u32 cause, mask;
int i;
cause = GT_READ(GT_INTRCAUSE_OFS);
mask = GT_READ(GT_INTRMASK_OFS);
cause &= mask;
/*
* bit0 : logical or of all the interrupt bits.
* bit30: logical or of bits[29:26,20:1].
* bit31: logical or of bits[25:1].
*/
for (i = 1; i < 30; i++) {
if (cause & (1U << i)) {
do_IRQ(GT641XX_IRQ_BASE + i);
return;
}
}
atomic_inc(&irq_err_count);
}
void __init gt641xx_irq_init(void)
{
int i;
GT_WRITE(GT_INTRMASK_OFS, 0);
GT_WRITE(GT_INTRCAUSE_OFS, 0);
/*
* bit0 : logical or of all the interrupt bits.
* bit30: logical or of bits[29:26,20:1].
* bit31: logical or of bits[25:1].
*/
for (i = 1; i < 30; i++)
set_irq_chip_and_handler(GT641XX_IRQ_BASE + i,
&gt641xx_irq_chip, handle_level_irq);
}

23
arch/mips/pci/fixup-cobalt.c
View File

@ -18,6 +18,7 @@
#include <asm/gt64120.h>
#include <cobalt.h>
#include <irq.h>
static void qube_raq_galileo_early_fixup(struct pci_dev *dev)
{
@ -132,29 +133,29 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0,
static char irq_tab_qube1[] __initdata = {
[COBALT_PCICONF_CPU] = 0,
[COBALT_PCICONF_ETH0] = COBALT_QUBE1_ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
[COBALT_PCICONF_ETH0] = QUBE1_ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
[COBALT_PCICONF_VIA] = 0,
[COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
[COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
[COBALT_PCICONF_ETH1] = 0
};
static char irq_tab_cobalt[] __initdata = {
[COBALT_PCICONF_CPU] = 0,
[COBALT_PCICONF_ETH0] = COBALT_ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
[COBALT_PCICONF_ETH0] = ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
[COBALT_PCICONF_VIA] = 0,
[COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
[COBALT_PCICONF_ETH1] = COBALT_ETH1_IRQ
[COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
[COBALT_PCICONF_ETH1] = ETH1_IRQ
};
static char irq_tab_raq2[] __initdata = {
[COBALT_PCICONF_CPU] = 0,
[COBALT_PCICONF_ETH0] = COBALT_ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = COBALT_RAQ_SCSI_IRQ,
[COBALT_PCICONF_ETH0] = ETH0_IRQ,
[COBALT_PCICONF_RAQSCSI] = RAQ2_SCSI_IRQ,
[COBALT_PCICONF_VIA] = 0,
[COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
[COBALT_PCICONF_ETH1] = COBALT_ETH1_IRQ
[COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
[COBALT_PCICONF_ETH1] = ETH1_IRQ
};
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

60
include/asm-mips/irq_gt641xx.h Normal file
View File

@ -0,0 +1,60 @@
/*
* Galileo/Marvell GT641xx IRQ definitions.
*
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ASM_IRQ_GT641XX_H
#define _ASM_IRQ_GT641XX_H
#ifndef GT641XX_IRQ_BASE
#define GT641XX_IRQ_BASE 8
#endif
#define GT641XX_MEMORY_OUT_OF_RANGE_IRQ (GT641XX_IRQ_BASE + 1)
#define GT641XX_DMA_OUT_OF_RANGE_IRQ (GT641XX_IRQ_BASE + 2)
#define GT641XX_CPU_ACCESS_OUT_OF_RANGE_IRQ (GT641XX_IRQ_BASE + 3)
#define GT641XX_DMA0_IRQ (GT641XX_IRQ_BASE + 4)
#define GT641XX_DMA1_IRQ (GT641XX_IRQ_BASE + 5)
#define GT641XX_DMA2_IRQ (GT641XX_IRQ_BASE + 6)
#define GT641XX_DMA3_IRQ (GT641XX_IRQ_BASE + 7)
#define GT641XX_TIMER0_IRQ (GT641XX_IRQ_BASE + 8)
#define GT641XX_TIMER1_IRQ (GT641XX_IRQ_BASE + 9)
#define GT641XX_TIMER2_IRQ (GT641XX_IRQ_BASE + 10)
#define GT641XX_TIMER3_IRQ (GT641XX_IRQ_BASE + 11)
#define GT641XX_PCI_0_MASTER_READ_ERROR_IRQ (GT641XX_IRQ_BASE + 12)
#define GT641XX_PCI_0_SLAVE_WRITE_ERROR_IRQ (GT641XX_IRQ_BASE + 13)
#define GT641XX_PCI_0_MASTER_WRITE_ERROR_IRQ (GT641XX_IRQ_BASE + 14)
#define GT641XX_PCI_0_SLAVE_READ_ERROR_IRQ (GT641XX_IRQ_BASE + 15)
#define GT641XX_PCI_0_ADDRESS_ERROR_IRQ (GT641XX_IRQ_BASE + 16)
#define GT641XX_MEMORY_ERROR_IRQ (GT641XX_IRQ_BASE + 17)
#define GT641XX_PCI_0_MASTER_ABORT_IRQ (GT641XX_IRQ_BASE + 18)
#define GT641XX_PCI_0_TARGET_ABORT_IRQ (GT641XX_IRQ_BASE + 19)
#define GT641XX_PCI_0_RETRY_TIMEOUT_IRQ (GT641XX_IRQ_BASE + 20)
#define GT641XX_CPU_INT0_IRQ (GT641XX_IRQ_BASE + 21)
#define GT641XX_CPU_INT1_IRQ (GT641XX_IRQ_BASE + 22)
#define GT641XX_CPU_INT2_IRQ (GT641XX_IRQ_BASE + 23)
#define GT641XX_CPU_INT3_IRQ (GT641XX_IRQ_BASE + 24)
#define GT641XX_CPU_INT4_IRQ (GT641XX_IRQ_BASE + 25)
#define GT641XX_PCI_INT0_IRQ (GT641XX_IRQ_BASE + 26)
#define GT641XX_PCI_INT1_IRQ (GT641XX_IRQ_BASE + 27)
#define GT641XX_PCI_INT2_IRQ (GT641XX_IRQ_BASE + 28)
#define GT641XX_PCI_INT3_IRQ (GT641XX_IRQ_BASE + 29)
extern void gt641xx_irq_dispatch(void);
extern void gt641xx_irq_init(void);
#endif /* _ASM_IRQ_GT641XX_H */

26
include/asm-mips/mach-cobalt/cobalt.h
View File

@ -12,32 +12,6 @@
#ifndef __ASM_COBALT_H
#define __ASM_COBALT_H
#include <irq.h>
/*
* i8259 legacy interrupts used on Cobalt:
*
* 8 - RTC
* 9 - PCI
* 14 - IDE0
* 15 - IDE1
*/
#define COBALT_QUBE_SLOT_IRQ 9
/*
* CPU IRQs are 16 ... 23
*/
#define COBALT_CPU_IRQ MIPS_CPU_IRQ_BASE
#define COBALT_GALILEO_IRQ (COBALT_CPU_IRQ + 2)
#define COBALT_RAQ_SCSI_IRQ (COBALT_CPU_IRQ + 3)
#define COBALT_ETH0_IRQ (COBALT_CPU_IRQ + 3)
#define COBALT_QUBE1_ETH0_IRQ (COBALT_CPU_IRQ + 4)
#define COBALT_ETH1_IRQ (COBALT_CPU_IRQ + 4)
#define COBALT_SERIAL_IRQ (COBALT_CPU_IRQ + 5)
#define COBALT_SCSI_IRQ (COBALT_CPU_IRQ + 5)
#define COBALT_VIA_IRQ (COBALT_CPU_IRQ + 6) /* Chained to VIA ISA bridge */
/*
* PCI configuration space manifest constants. These are wired into
* the board layout according to the PCI spec to enable the software

58
include/asm-mips/mach-cobalt/irq.h Normal file
View File

@ -0,0 +1,58 @@
/*
* Cobalt IRQ definitions.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1997 Cobalt Microserver
* Copyright (C) 1997, 2003 Ralf Baechle
* Copyright (C) 2001-2003 Liam Davies (ldavies@agile.tv)
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*/
#ifndef _ASM_COBALT_IRQ_H
#define _ASM_COBALT_IRQ_H
/*
* i8259 interrupts used on Cobalt:
*
* 8 - RTC
* 9 - PCI slot
* 14 - IDE0
* 15 - IDE1(no connector on board)
*/
#define I8259A_IRQ_BASE 0
#define PCISLOT_IRQ (I8259A_IRQ_BASE + 9)
/*
* CPU interrupts used on Cobalt:
*
* 0 - Software interrupt 0 (unused)
* 1 - Software interrupt 0 (unused)
* 2 - cascade GT64111
* 3 - ethernet or SCSI host controller
* 4 - ethernet
* 5 - 16550 UART
* 6 - cascade i8259
* 7 - CP0 counter (unused)
*/
#define MIPS_CPU_IRQ_BASE 16
#define GT641XX_CASCADE_IRQ (MIPS_CPU_IRQ_BASE + 2)
#define RAQ2_SCSI_IRQ (MIPS_CPU_IRQ_BASE + 3)
#define ETH0_IRQ (MIPS_CPU_IRQ_BASE + 3)
#define QUBE1_ETH0_IRQ (MIPS_CPU_IRQ_BASE + 4)
#define ETH1_IRQ (MIPS_CPU_IRQ_BASE + 4)
#define SERIAL_IRQ (MIPS_CPU_IRQ_BASE + 5)
#define SCSI_IRQ (MIPS_CPU_IRQ_BASE + 5)
#define I8259_CASCADE_IRQ (MIPS_CPU_IRQ_BASE + 6)
#define GT641XX_IRQ_BASE 24
#include <asm/irq_gt641xx.h>
#define NR_IRQS (GT641XX_PCI_INT3_IRQ + 1)
#endif /* _ASM_COBALT_IRQ_H */