- 根目录:
- arch
- mips
- txx9
- rbtx4927
- irq.c
/*
* Toshiba RBTX4927 specific interrupt handlers
*
* Author: MontaVista Software, Inc.
* source@mvista.com
*
* Copyright 2001-2002 MontaVista Software Inc.
*
* 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.
*/
/*
* I8259A_IRQ_BASE+00
* I8259A_IRQ_BASE+01 PS2/Keyboard
* I8259A_IRQ_BASE+02 Cascade RBTX4927-ISA (irqs 8-15)
* I8259A_IRQ_BASE+03
* I8259A_IRQ_BASE+04
* I8259A_IRQ_BASE+05
* I8259A_IRQ_BASE+06
* I8259A_IRQ_BASE+07
* I8259A_IRQ_BASE+08
* I8259A_IRQ_BASE+09
* I8259A_IRQ_BASE+10
* I8259A_IRQ_BASE+11
* I8259A_IRQ_BASE+12 PS2/Mouse (not supported at this time)
* I8259A_IRQ_BASE+13
* I8259A_IRQ_BASE+14 IDE
* I8259A_IRQ_BASE+15
*
* MIPS_CPU_IRQ_BASE+00 Software 0
* MIPS_CPU_IRQ_BASE+01 Software 1
* MIPS_CPU_IRQ_BASE+02 Cascade TX4927-CP0
* MIPS_CPU_IRQ_BASE+03 Multiplexed -- do not use
* MIPS_CPU_IRQ_BASE+04 Multiplexed -- do not use
* MIPS_CPU_IRQ_BASE+05 Multiplexed -- do not use
* MIPS_CPU_IRQ_BASE+06 Multiplexed -- do not use
* MIPS_CPU_IRQ_BASE+07 CPU TIMER
*
* TXX9_IRQ_BASE+00
* TXX9_IRQ_BASE+01
* TXX9_IRQ_BASE+02
* TXX9_IRQ_BASE+03 Cascade RBTX4927-IOC
* TXX9_IRQ_BASE+04
* TXX9_IRQ_BASE+05 RBTX4927 RTL-8019AS ethernet
* TXX9_IRQ_BASE+06
* TXX9_IRQ_BASE+07
* TXX9_IRQ_BASE+08 TX4927 SerialIO Channel 0
* TXX9_IRQ_BASE+09 TX4927 SerialIO Channel 1
* TXX9_IRQ_BASE+10
* TXX9_IRQ_BASE+11
* TXX9_IRQ_BASE+12
* TXX9_IRQ_BASE+13
* TXX9_IRQ_BASE+14
* TXX9_IRQ_BASE+15
* TXX9_IRQ_BASE+16 TX4927 PCI PCI-C
* TXX9_IRQ_BASE+17
* TXX9_IRQ_BASE+18
* TXX9_IRQ_BASE+19
* TXX9_IRQ_BASE+20
* TXX9_IRQ_BASE+21
* TXX9_IRQ_BASE+22 TX4927 PCI PCI-ERR
* TXX9_IRQ_BASE+23 TX4927 PCI PCI-PMA (not used)
* TXX9_IRQ_BASE+24
* TXX9_IRQ_BASE+25
* TXX9_IRQ_BASE+26
* TXX9_IRQ_BASE+27
* TXX9_IRQ_BASE+28
* TXX9_IRQ_BASE+29
* TXX9_IRQ_BASE+30
* TXX9_IRQ_BASE+31
*
* RBTX4927_IRQ_IOC+00 FPCIB0 PCI-D (SouthBridge)
* RBTX4927_IRQ_IOC+01 FPCIB0 PCI-C (SouthBridge)
* RBTX4927_IRQ_IOC+02 FPCIB0 PCI-B (SouthBridge/IDE/pin=1,INTR)
* RBTX4927_IRQ_IOC+03 FPCIB0 PCI-A (SouthBridge/USB/pin=4)
* RBTX4927_IRQ_IOC+04
* RBTX4927_IRQ_IOC+05
* RBTX4927_IRQ_IOC+06
* RBTX4927_IRQ_IOC+07
*
* NOTES:
* SouthBridge/INTR is mapped to SouthBridge/A=PCI-B/#58
* SouthBridge/ISA/pin=0 no pci irq used by this device
* SouthBridge/IDE/pin=1 no pci irq used by this device, using INTR
* via ISA IRQ14
* SouthBridge/USB/pin=4 using pci irq SouthBridge/D=PCI-A=#59
* SouthBridge/PMC/pin=0 no pci irq used by this device
* SuperIO/PS2/Keyboard, using INTR via ISA IRQ1
* SuperIO/PS2/Mouse, using INTR via ISA IRQ12 (mouse not currently supported)
* JP7 is not bus master -- do NOT use -- only 4 pci bus master's
* allowed -- SouthBridge, JP4, JP5, JP6
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/rbtx4927.h>
static int toshiba_rbtx4927_irq_nested(int sw_irq)
{
u8 level3;
level3 = readb(rbtx4927_imstat_addr) & 0x1f;
if (unlikely(!level3))
return -1;
return RBTX4927_IRQ_IOC + __fls8(level3);
}
static void toshiba_rbtx4927_irq_ioc_enable(struct irq_data *d)
{
unsigned char v;
v = readb(rbtx4927_imask_addr);
v |= (1 << (d->irq - RBTX4927_IRQ_IOC));
writeb(v, rbtx4927_imask_addr);
}
static void toshiba_rbtx4927_irq_ioc_disable(struct irq_data *d)
{
unsigned char v;
v = readb(rbtx4927_imask_addr);
v &= ~(1 << (d->irq - RBTX4927_IRQ_IOC));
writeb(v, rbtx4927_imask_addr);
mmiowb();
}
#define TOSHIBA_RBTX4927_IOC_NAME "RBTX4927-IOC"
static struct irq_chip toshiba_rbtx4927_irq_ioc_type = {
.name = TOSHIBA_RBTX4927_IOC_NAME,
.irq_mask = toshiba_rbtx4927_irq_ioc_disable,
.irq_unmask = toshiba_rbtx4927_irq_ioc_enable,
};
static void __init toshiba_rbtx4927_irq_ioc_init(void)
{
int i;
/* mask all IOC interrupts */
writeb(0, rbtx4927_imask_addr);
/* clear SoftInt interrupts */
writeb(0, rbtx4927_softint_addr);
for (i = RBTX4927_IRQ_IOC;
i < RBTX4927_IRQ_IOC + RBTX4927_NR_IRQ_IOC; i++)
irq_set_chip_and_handler(i, &toshiba_rbtx4927_irq_ioc_type,
handle_level_irq);
irq_set_chained_handler(RBTX4927_IRQ_IOCINT, handle_simple_irq);
}
static int rbtx4927_irq_dispatch(int pending)
{
int irq;
if (pending & STATUSF_IP7) /* cpu timer */
irq = MIPS_CPU_IRQ_BASE + 7;
else if (pending & STATUSF_IP2) { /* tx4927 pic */
irq = txx9_irq();
if (irq == RBTX4927_IRQ_IOCINT)
irq = toshiba_rbtx4927_irq_nested(irq);
} else if (pending & STATUSF_IP0) /* user line 0 */
irq = MIPS_CPU_IRQ_BASE + 0;
else if (pending & STATUSF_IP1) /* user line 1 */
irq = MIPS_CPU_IRQ_BASE + 1;
else
irq = -1;
return irq;
}
void __init rbtx4927_irq_setup(void)
{
txx9_irq_dispatch = rbtx4927_irq_dispatch;
tx4927_irq_init();
toshiba_rbtx4927_irq_ioc_init();
/* Onboard 10M Ether: High Active */
irq_set_irq_type(RBTX4927_RTL_8019_IRQ, IRQF_TRIGGER_HIGH);
}