path: root/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_irq.c

/*
 * linux/arch/mips/tx4927/toshiba_rbtx4927/toshiba_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.
 */


/*
IRQ  Device
00   RBTX4927-ISA/00
01   RBTX4927-ISA/01 PS2/Keyboard
02   RBTX4927-ISA/02 Cascade RBTX4927-ISA (irqs 8-15)
03   RBTX4927-ISA/03
04   RBTX4927-ISA/04
05   RBTX4927-ISA/05
06   RBTX4927-ISA/06
07   RBTX4927-ISA/07
08   RBTX4927-ISA/08
09   RBTX4927-ISA/09
10   RBTX4927-ISA/10
11   RBTX4927-ISA/11
12   RBTX4927-ISA/12 PS2/Mouse (not supported at this time)
13   RBTX4927-ISA/13
14   RBTX4927-ISA/14 IDE
15   RBTX4927-ISA/15

16   TX4927-CP0/00 Software 0
17   TX4927-CP0/01 Software 1
18   TX4927-CP0/02 Cascade TX4927-CP0
19   TX4927-CP0/03 Multiplexed -- do not use
20   TX4927-CP0/04 Multiplexed -- do not use
21   TX4927-CP0/05 Multiplexed -- do not use
22   TX4927-CP0/06 Multiplexed -- do not use
23   TX4927-CP0/07 CPU TIMER

24   TX4927-PIC/00
25   TX4927-PIC/01
26   TX4927-PIC/02
27   TX4927-PIC/03 Cascade RBTX4927-IOC
28   TX4927-PIC/04
29   TX4927-PIC/05 RBTX4927 RTL-8019AS ethernet
30   TX4927-PIC/06
31   TX4927-PIC/07
32   TX4927-PIC/08 TX4927 SerialIO Channel 0
33   TX4927-PIC/09 TX4927 SerialIO Channel 1
34   TX4927-PIC/10
35   TX4927-PIC/11
36   TX4927-PIC/12
37   TX4927-PIC/13
38   TX4927-PIC/14
39   TX4927-PIC/15
40   TX4927-PIC/16 TX4927 PCI PCI-C
41   TX4927-PIC/17
42   TX4927-PIC/18
43   TX4927-PIC/19
44   TX4927-PIC/20
45   TX4927-PIC/21
46   TX4927-PIC/22 TX4927 PCI PCI-ERR
47   TX4927-PIC/23 TX4927 PCI PCI-PMA (not used)
48   TX4927-PIC/24
49   TX4927-PIC/25
50   TX4927-PIC/26
51   TX4927-PIC/27
52   TX4927-PIC/28
53   TX4927-PIC/29
54   TX4927-PIC/30
55   TX4927-PIC/31

56 RBTX4927-IOC/00 FPCIB0 PCI-D PJ4/A PJ5/B SB/C PJ6/D PJ7/A (SouthBridge/NotUsed)        [RTL-8139=PJ4]
57 RBTX4927-IOC/01 FPCIB0 PCI-C PJ4/D PJ5/A SB/B PJ6/C PJ7/D (SouthBridge/NotUsed)        [RTL-8139=PJ5]
58 RBTX4927-IOC/02 FPCIB0 PCI-B PJ4/C PJ5/D SB/A PJ6/B PJ7/C (SouthBridge/IDE/pin=1,INTR) [RTL-8139=NotSupported]
59 RBTX4927-IOC/03 FPCIB0 PCI-A PJ4/B PJ5/C SB/D PJ6/A PJ7/B (SouthBridge/USB/pin=4)      [RTL-8139=PJ6]
60 RBTX4927-IOC/04
61 RBTX4927-IOC/05
62 RBTX4927-IOC/06
63 RBTX4927-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/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/timex.h>
#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pci.h>
#include <asm/processor.h>
#include <asm/reboot.h>
#include <asm/time.h>
#include <linux/bootmem.h>
#include <linux/blkdev.h>
#ifdef CONFIG_RTC_DS1742
#include <linux/ds1742rtc.h>
#endif
#ifdef CONFIG_TOSHIBA_FPCIB0
#include <asm/tx4927/smsc_fdc37m81x.h>
#endif
#include <asm/tx4927/toshiba_rbtx4927.h>


#undef TOSHIBA_RBTX4927_IRQ_DEBUG

#ifdef TOSHIBA_RBTX4927_IRQ_DEBUG
#define TOSHIBA_RBTX4927_IRQ_NONE        0x00000000

#define TOSHIBA_RBTX4927_IRQ_INFO          ( 1 <<  0 )
#define TOSHIBA_RBTX4927_IRQ_WARN          ( 1 <<  1 )
#define TOSHIBA_RBTX4927_IRQ_EROR          ( 1 <<  2 )

#define TOSHIBA_RBTX4927_IRQ_IOC_INIT      ( 1 << 10 )
#define TOSHIBA_RBTX4927_IRQ_IOC_STARTUP   ( 1 << 11 )
#define TOSHIBA_RBTX4927_IRQ_IOC_SHUTDOWN  ( 1 << 12 )
#define TOSHIBA_RBTX4927_IRQ_IOC_ENABLE    ( 1 << 13 )
#define TOSHIBA_RBTX4927_IRQ_IOC_DISABLE   ( 1 << 14 )
#define TOSHIBA_RBTX4927_IRQ_IOC_MASK      ( 1 << 15 )
#define TOSHIBA_RBTX4927_IRQ_IOC_ENDIRQ    ( 1 << 16 )

#define TOSHIBA_RBTX4927_IRQ_ISA_INIT      ( 1 << 20 )
#define TOSHIBA_RBTX4927_IRQ_ISA_STARTUP   ( 1 << 21 )
#define TOSHIBA_RBTX4927_IRQ_ISA_SHUTDOWN  ( 1 << 22 )
#define TOSHIBA_RBTX4927_IRQ_ISA_ENABLE    ( 1 << 23 )
#define TOSHIBA_RBTX4927_IRQ_ISA_DISABLE   ( 1 << 24 )
#define TOSHIBA_RBTX4927_IRQ_ISA_MASK      ( 1 << 25 )
#define TOSHIBA_RBTX4927_IRQ_ISA_ENDIRQ    ( 1 << 26 )

#define TOSHIBA_RBTX4927_SETUP_ALL         0xffffffff
#endif


#ifdef TOSHIBA_RBTX4927_IRQ_DEBUG
static const u32 toshiba_rbtx4927_irq_debug_flag =
    (TOSHIBA_RBTX4927_IRQ_NONE | TOSHIBA_RBTX4927_IRQ_INFO |
     TOSHIBA_RBTX4927_IRQ_WARN | TOSHIBA_RBTX4927_IRQ_EROR
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_INIT
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_STARTUP
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_SHUTDOWN
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_ENABLE
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_DISABLE
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_MASK
//                                                 | TOSHIBA_RBTX4927_IRQ_IOC_ENDIRQ
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_INIT
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_STARTUP
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_SHUTDOWN
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_ENABLE
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_DISABLE
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_MASK
//                                                 | TOSHIBA_RBTX4927_IRQ_ISA_ENDIRQ
    );
#endif


#ifdef TOSHIBA_RBTX4927_IRQ_DEBUG
#define TOSHIBA_RBTX4927_IRQ_DPRINTK(flag,str...) \
        if ( (toshiba_rbtx4927_irq_debug_flag) & (flag) ) \
        { \
           char tmp[100]; \
           sprintf( tmp, str ); \
           printk( "%s(%s:%u)::%s", __FUNCTION__, __FILE__, __LINE__, tmp ); \
        }
#else
#define TOSHIBA_RBTX4927_IRQ_DPRINTK(flag,str...)
#endif




#define TOSHIBA_RBTX4927_IRQ_IOC_RAW_BEG   0
#define TOSHIBA_RBTX4927_IRQ_IOC_RAW_END   7

#define TOSHIBA_RBTX4927_IRQ_IOC_BEG  ((TX4927_IRQ_PIC_END+1)+TOSHIBA_RBTX4927_IRQ_IOC_RAW_BEG)	/* 56 */
#define TOSHIBA_RBTX4927_IRQ_IOC_END  ((TX4927_IRQ_PIC_END+1)+TOSHIBA_RBTX4927_IRQ_IOC_RAW_END)	/* 63 */


#define TOSHIBA_RBTX4927_IRQ_ISA_BEG MI8259_IRQ_ISA_BEG
#define TOSHIBA_RBTX4927_IRQ_ISA_END MI8259_IRQ_ISA_END
#define TOSHIBA_RBTX4927_IRQ_ISA_MID ((TOSHIBA_RBTX4927_IRQ_ISA_BEG+TOSHIBA_RBTX4927_IRQ_ISA_END+1)/2)


#define TOSHIBA_RBTX4927_IRQ_NEST_IOC_ON_PIC TX4927_IRQ_NEST_EXT_ON_PIC
#define TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_IOC (TOSHIBA_RBTX4927_IRQ_IOC_BEG+2)
#define TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_ISA (TOSHIBA_RBTX4927_IRQ_ISA_BEG+2)

extern int tx4927_using_backplane;

#ifdef CONFIG_TOSHIBA_FPCIB0
extern void enable_8259A_irq(unsigned int irq);
extern void disable_8259A_irq(unsigned int irq);
extern void mask_and_ack_8259A(unsigned int irq);
#endif

static unsigned int toshiba_rbtx4927_irq_ioc_startup(unsigned int irq);
static void toshiba_rbtx4927_irq_ioc_shutdown(unsigned int irq);
static void toshiba_rbtx4927_irq_ioc_enable(unsigned int irq);
static void toshiba_rbtx4927_irq_ioc_disable(unsigned int irq);
static void toshiba_rbtx4927_irq_ioc_mask_and_ack(unsigned int irq);
static void toshiba_rbtx4927_irq_ioc_end(unsigned int irq);

#ifdef CONFIG_TOSHIBA_FPCIB0
static unsigned int toshiba_rbtx4927_irq_isa_startup(unsigned int irq);
static void toshiba_rbtx4927_irq_isa_shutdown(unsigned int irq);
static void toshiba_rbtx4927_irq_isa_enable(unsigned int irq);
static void toshiba_rbtx4927_irq_isa_disable(unsigned int irq);
static void toshiba_rbtx4927_irq_isa_mask_and_ack(unsigned int irq);
static void toshiba_rbtx4927_irq_isa_end(unsigned int irq);
#endif

static DEFINE_SPINLOCK(toshiba_rbtx4927_ioc_lock);


#define TOSHIBA_RBTX4927_IOC_NAME "RBTX4927-IOC"
static struct irq_chip toshiba_rbtx4927_irq_ioc_type = {
	.typename = TOSHIBA_RBTX4927_IOC_NAME,
	.startup = toshiba_rbtx4927_irq_ioc_startup,
	.shutdown = toshiba_rbtx4927_irq_ioc_shutdown,
	.enable = toshiba_rbtx4927_irq_ioc_enable,
	.disable = toshiba_rbtx4927_irq_ioc_disable,
	.ack = toshiba_rbtx4927_irq_ioc_mask_and_ack,
	.end = toshiba_rbtx4927_irq_ioc_end,
	.set_affinity = NULL
};
#define TOSHIBA_RBTX4927_IOC_INTR_ENAB 0xbc002000
#define TOSHIBA_RBTX4927_IOC_INTR_STAT 0xbc002006


#ifdef CONFIG_TOSHIBA_FPCIB0
#define TOSHIBA_RBTX4927_ISA_NAME "RBTX4927-ISA"
static struct irq_chip toshiba_rbtx4927_irq_isa_type = {
	.typename = TOSHIBA_RBTX4927_ISA_NAME,
	.startup = toshiba_rbtx4927_irq_isa_startup,
	.shutdown = toshiba_rbtx4927_irq_isa_shutdown,
	.enable = toshiba_rbtx4927_irq_isa_enable,
	.disable = toshiba_rbtx4927_irq_isa_disable,
	.ack = toshiba_rbtx4927_irq_isa_mask_and_ack,
	.end = toshiba_rbtx4927_irq_isa_end,
	.set_affinity = NULL
};
#endif


u32 bit2num(u32 num)
{
	u32 i;

	for (i = 0; i < (sizeof(num) * 8); i++) {
		if (num & (1 << i)) {
			return (i);
		}
	}
	return (0);
}

int toshiba_rbtx4927_irq_nested(int sw_irq)
{
	u32 level3;
	u32 level4;
	u32 level5;

	level3 = reg_rd08(TOSHIBA_RBTX4927_IOC_INTR_STAT) & 0x1f;
	if (level3) {
		sw_irq = TOSHIBA_RBTX4927_IRQ_IOC_BEG + bit2num(level3);
		if (sw_irq != TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_IOC) {
			goto RETURN;
		}
	}
#ifdef CONFIG_TOSHIBA_FPCIB0
	{
		if (tx4927_using_backplane) {
			outb(0x0A, 0x20);
			level4 = inb(0x20) & 0xff;
			if (level4) {
				sw_irq =
				    TOSHIBA_RBTX4927_IRQ_ISA_BEG +
				    bit2num(level4);
				if (sw_irq !=
				    TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_ISA) {
					goto RETURN;
				}
			}

			outb(0x0A, 0xA0);
			level5 = inb(0xA0) & 0xff;
			if (level5) {
				sw_irq =
				    TOSHIBA_RBTX4927_IRQ_ISA_MID +
				    bit2num(level5);
				goto RETURN;
			}
		}
	}
#endif

      RETURN:
	return (sw_irq);
}

//#define TOSHIBA_RBTX4927_PIC_ACTION(s) { no_action, 0, CPU_MASK_NONE, s, NULL, NULL }
#define TOSHIBA_RBTX4927_PIC_ACTION(s) { no_action, IRQF_SHARED, CPU_MASK_NONE, s, NULL, NULL }
static struct irqaction toshiba_rbtx4927_irq_ioc_action =
TOSHIBA_RBTX4927_PIC_ACTION(TOSHIBA_RBTX4927_IOC_NAME);
#ifdef CONFIG_TOSHIBA_FPCIB0
static struct irqaction toshiba_rbtx4927_irq_isa_master =
TOSHIBA_RBTX4927_PIC_ACTION(TOSHIBA_RBTX4927_ISA_NAME "/M");
static struct irqaction toshiba_rbtx4927_irq_isa_slave =
TOSHIBA_RBTX4927_PIC_ACTION(TOSHIBA_RBTX4927_ISA_NAME "/S");
#endif


/**********************************************************************************/
/* Functions for ioc                                                              */
/**********************************************************************************/


static void __init toshiba_rbtx4927_irq_ioc_init(void)
{
	int i;

	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_INIT,
				     "beg=%d end=%d\n",
				     TOSHIBA_RBTX4927_IRQ_IOC_BEG,
				     TOSHIBA_RBTX4927_IRQ_IOC_END);

	for (i = TOSHIBA_RBTX4927_IRQ_IOC_BEG;
	     i <= TOSHIBA_RBTX4927_IRQ_IOC_END; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = 0;
		irq_desc[i].depth = 3;
		irq_desc[i].chip = &toshiba_rbtx4927_irq_ioc_type;
	}

	setup_irq(TOSHIBA_RBTX4927_IRQ_NEST_IOC_ON_PIC,
		  &toshiba_rbtx4927_irq_ioc_action);

	return;
}

static unsigned int toshiba_rbtx4927_irq_ioc_startup(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_STARTUP,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	toshiba_rbtx4927_irq_ioc_enable(irq);

	return (0);
}


static void toshiba_rbtx4927_irq_ioc_shutdown(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_SHUTDOWN,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	toshiba_rbtx4927_irq_ioc_disable(irq);

	return;
}


static void toshiba_rbtx4927_irq_ioc_enable(unsigned int irq)
{
	unsigned long flags;
	volatile unsigned char v;

	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_ENABLE,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	spin_lock_irqsave(&toshiba_rbtx4927_ioc_lock, flags);

	v = TX4927_RD08(TOSHIBA_RBTX4927_IOC_INTR_ENAB);
	v |= (1 << (irq - TOSHIBA_RBTX4927_IRQ_IOC_BEG));
	TOSHIBA_RBTX4927_WR08(TOSHIBA_RBTX4927_IOC_INTR_ENAB, v);

	spin_unlock_irqrestore(&toshiba_rbtx4927_ioc_lock, flags);

	return;
}


static void toshiba_rbtx4927_irq_ioc_disable(unsigned int irq)
{
	unsigned long flags;
	volatile unsigned char v;

	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_DISABLE,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	spin_lock_irqsave(&toshiba_rbtx4927_ioc_lock, flags);

	v = TX4927_RD08(TOSHIBA_RBTX4927_IOC_INTR_ENAB);
	v &= ~(1 << (irq - TOSHIBA_RBTX4927_IRQ_IOC_BEG));
	TOSHIBA_RBTX4927_WR08(TOSHIBA_RBTX4927_IOC_INTR_ENAB, v);

	spin_unlock_irqrestore(&toshiba_rbtx4927_ioc_lock, flags);

	return;
}


static void toshiba_rbtx4927_irq_ioc_mask_and_ack(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_MASK,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	toshiba_rbtx4927_irq_ioc_disable(irq);

	return;
}


static void toshiba_rbtx4927_irq_ioc_end(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_IOC_ENDIRQ,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_IOC_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_IOC_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
		toshiba_rbtx4927_irq_ioc_enable(irq);
	}

	return;
}


/**********************************************************************************/
/* Functions for isa                                                              */
/**********************************************************************************/


#ifdef CONFIG_TOSHIBA_FPCIB0
static void __init toshiba_rbtx4927_irq_isa_init(void)
{
	int i;

	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_INIT,
				     "beg=%d end=%d\n",
				     TOSHIBA_RBTX4927_IRQ_ISA_BEG,
				     TOSHIBA_RBTX4927_IRQ_ISA_END);

	for (i = TOSHIBA_RBTX4927_IRQ_ISA_BEG;
	     i <= TOSHIBA_RBTX4927_IRQ_ISA_END; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = 0;
		irq_desc[i].depth =
		    ((i < TOSHIBA_RBTX4927_IRQ_ISA_MID) ? (4) : (5));
		irq_desc[i].chip = &toshiba_rbtx4927_irq_isa_type;
	}

	setup_irq(TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_IOC,
		  &toshiba_rbtx4927_irq_isa_master);
	setup_irq(TOSHIBA_RBTX4927_IRQ_NEST_ISA_ON_ISA,
		  &toshiba_rbtx4927_irq_isa_slave);

	/* make sure we are looking at IRR (not ISR) */
	outb(0x0A, 0x20);
	outb(0x0A, 0xA0);

	return;
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static unsigned int toshiba_rbtx4927_irq_isa_startup(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_STARTUP,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	toshiba_rbtx4927_irq_isa_enable(irq);

	return (0);
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static void toshiba_rbtx4927_irq_isa_shutdown(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_SHUTDOWN,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	toshiba_rbtx4927_irq_isa_disable(irq);

	return;
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static void toshiba_rbtx4927_irq_isa_enable(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_ENABLE,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	enable_8259A_irq(irq);

	return;
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static void toshiba_rbtx4927_irq_isa_disable(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_DISABLE,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	disable_8259A_irq(irq);

	return;
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static void toshiba_rbtx4927_irq_isa_mask_and_ack(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_MASK,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	mask_and_ack_8259A(irq);

	return;
}
#endif


#ifdef CONFIG_TOSHIBA_FPCIB0
static void toshiba_rbtx4927_irq_isa_end(unsigned int irq)
{
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_ISA_ENDIRQ,
				     "irq=%d\n", irq);

	if (irq < TOSHIBA_RBTX4927_IRQ_ISA_BEG
	    || irq > TOSHIBA_RBTX4927_IRQ_ISA_END) {
		TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_EROR,
					     "bad irq=%d\n", irq);
		panic("\n");
	}

	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
		toshiba_rbtx4927_irq_isa_enable(irq);
	}

	return;
}
#endif


void __init arch_init_irq(void)
{
	extern void tx4927_irq_init(void);

	local_irq_disable();

	tx4927_irq_init();
	toshiba_rbtx4927_irq_ioc_init();
#ifdef CONFIG_TOSHIBA_FPCIB0
	{
		if (tx4927_using_backplane) {
			toshiba_rbtx4927_irq_isa_init();
		}
	}
#endif

	wbflush();

	return;
}

void toshiba_rbtx4927_irq_dump(char *key)
{
#ifdef TOSHIBA_RBTX4927_IRQ_DEBUG
	{
		u32 i, j = 0;
		for (i = 0; i < NR_IRQS; i++) {
			if (strcmp(irq_desc[i].chip->typename, "none")
			    == 0)
				continue;

			if ((i >= 1)
			    && (irq_desc[i - 1].chip->typename ==
				irq_desc[i].chip->typename)) {
				j++;
			} else {
				j = 0;
			}
			TOSHIBA_RBTX4927_IRQ_DPRINTK
			    (TOSHIBA_RBTX4927_IRQ_INFO,
			     "%s irq=0x%02x/%3d s=0x%08x h=0x%08x a=0x%08x ah=0x%08x d=%1d n=%s/%02d\n",
			     key, i, i, irq_desc[i].status,
			     (u32) irq_desc[i].chip,
			     (u32) irq_desc[i].action,
			     (u32) (irq_desc[i].action ? irq_desc[i].
				    action->handler : 0),
			     irq_desc[i].depth,
			     irq_desc[i].chip->typename, j);
		}
	}
#endif
	return;
}

void toshiba_rbtx4927_irq_dump_pics(char *s)
{
	u32 level0_m;
	u32 level0_s;
	u32 level1_m;
	u32 level1_s;
	u32 level2;
	u32 level2_p;
	u32 level2_s;
	u32 level3_m;
	u32 level3_s;
	u32 level4_m;
	u32 level4_s;
	u32 level5_m;
	u32 level5_s;

	if (s == NULL)
		s = "null";

	level0_m = (read_c0_status() & 0x0000ff00) >> 8;
	level0_s = (read_c0_cause() & 0x0000ff00) >> 8;

	level1_m = level0_m;
	level1_s = level0_s & 0x87;

	level2 = TX4927_RD(0xff1ff6a0);
	level2_p = (((level2 & 0x10000)) ? 0 : 1);
	level2_s = (((level2 & 0x1f) == 0x1f) ? 0 : (level2 & 0x1f));

	level3_m = reg_rd08(TOSHIBA_RBTX4927_IOC_INTR_ENAB) & 0x1f;
	level3_s = reg_rd08(TOSHIBA_RBTX4927_IOC_INTR_STAT) & 0x1f;

	level4_m = inb(0x21);
	outb(0x0A, 0x20);
	level4_s = inb(0x20);

	level5_m = inb(0xa1);
	outb(0x0A, 0xa0);
	level5_s = inb(0xa0);

	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "dump_raw_pic() ");
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "cp0:m=0x%02x/s=0x%02x ", level0_m,
				     level0_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "cp0:m=0x%02x/s=0x%02x ", level1_m,
				     level1_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "pic:e=0x%02x/s=0x%02x ", level2_p,
				     level2_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "ioc:m=0x%02x/s=0x%02x ", level3_m,
				     level3_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "sbm:m=0x%02x/s=0x%02x ", level4_m,
				     level4_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO,
				     "sbs:m=0x%02x/s=0x%02x ", level5_m,
				     level5_s);
	TOSHIBA_RBTX4927_IRQ_DPRINTK(TOSHIBA_RBTX4927_IRQ_INFO, "[%s]\n",
				     s);

	return;
}