/*
* linux/arch/mips/tx4938/toshiba_rbtx4938/irq.c
*
* Toshiba RBTX4938 specific interrupt handlers
* Copyright (C) 2000-2001 Toshiba Corporation
*
* 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
* terms of the GNU General Public License version 2. This program is
* licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
*/
/*
IRQ Device
16 TX4938-CP0/00 Software 0
17 TX4938-CP0/01 Software 1
18 TX4938-CP0/02 Cascade TX4938-CP0
19 TX4938-CP0/03 Multiplexed -- do not use
20 TX4938-CP0/04 Multiplexed -- do not use
21 TX4938-CP0/05 Multiplexed -- do not use
22 TX4938-CP0/06 Multiplexed -- do not use
23 TX4938-CP0/07 CPU TIMER
24 TX4938-PIC/00
25 TX4938-PIC/01
26 TX4938-PIC/02 Cascade RBTX4938-IOC
27 TX4938-PIC/03 RBTX4938 RTL-8019AS Ethernet
28 TX4938-PIC/04
29 TX4938-PIC/05 TX4938 ETH1
30 TX4938-PIC/06 TX4938 ETH0
31 TX4938-PIC/07
32 TX4938-PIC/08 TX4938 SIO 0
33 TX4938-PIC/09 TX4938 SIO 1
34 TX4938-PIC/10 TX4938 DMA0
35 TX4938-PIC/11 TX4938 DMA1
36 TX4938-PIC/12 TX4938 DMA2
37 TX4938-PIC/13 TX4938 DMA3
38 TX4938-PIC/14
39 TX4938-PIC/15
40 TX4938-PIC/16 TX4938 PCIC
41 TX4938-PIC/17 TX4938 TMR0
42 TX4938-PIC/18 TX4938 TMR1
43 TX4938-PIC/19 TX4938 TMR2
44 TX4938-PIC/20
45 TX4938-PIC/21
46 TX4938-PIC/22 TX4938 PCIERR
47 TX4938-PIC/23
48 TX4938-PIC/24
49 TX4938-PIC/25
50 TX4938-PIC/26
51 TX4938-PIC/27
52 TX4938-PIC/28
53 TX4938-PIC/29
54 TX4938-PIC/30
55 TX4938-PIC/31 TX4938 SPI
56 RBTX4938-IOC/00 PCI-D
57 RBTX4938-IOC/01 PCI-C
58 RBTX4938-IOC/02 PCI-B
59 RBTX4938-IOC/03 PCI-A
60 RBTX4938-IOC/04 RTC
61 RBTX4938-IOC/05 ATA
62 RBTX4938-IOC/06 MODEM
63 RBTX4938-IOC/07 SWINT
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/tx4938/rbtx4938.h>
static void toshiba_rbtx4938_irq_ioc_enable(unsigned int irq);
static void toshiba_rbtx4938_irq_ioc_disable(unsigned int irq);
#define TOSHIBA_RBTX4938_IOC_NAME "RBTX4938-IOC"
static struct irq_chip toshiba_rbtx4938_irq_ioc_type = {
.name = TOSHIBA_RBTX4938_IOC_NAME,
.ack = toshiba_rbtx4938_irq_ioc_disable,
.mask = toshiba_rbtx4938_irq_ioc_disable,
.mask_ack = toshiba_rbtx4938_irq_ioc_disable,
.unmask = toshiba_rbtx4938_irq_ioc_enable,
};
int
toshiba_rbtx4938_irq_nested(int sw_irq)
{
u8 level3;
level3 = readb(rbtx4938_imstat_addr);
if (level3)
/* must use fls so onboard ATA has priority */
sw_irq = TOSHIBA_RBTX4938_IRQ_IOC_BEG + fls(level3) - 1;
return sw_irq;
}
static struct irqaction toshiba_rbtx4938_irq_ioc_action = {
.handler = no_action,
.flags = 0,
.mask = CPU_MASK_NONE,
.name = TOSHIBA_RBTX4938_IOC_NAME,
};
/**********************************************************************************/
/* Functions for ioc */
/**********************************************************************************/
static void __init
toshiba_rbtx4938_irq_ioc_init(void)
{
int i;
for (i = TOSHIBA_RBTX4938_IRQ_IOC_BEG;
i <= TOSHIBA_RBTX4938_IRQ_IOC_END; i++)
set_irq_chip_and_handler(i, &toshiba_rbtx4938_irq_ioc_type,
handle_level_irq);
setup_irq(RBTX4938_IRQ_IOCINT,
&toshiba_rbtx4938_irq_ioc_action);
}
static void
toshiba_rbtx4938_irq_ioc_enable(unsigned int irq)
{
unsigned char v;
v = readb(rbtx4938_imask_addr);
v |= (1 << (irq - TOSHIBA_RBTX4938_IRQ_IOC_BEG));
writeb(v, rbtx4938_imask_addr);
mmiowb();
}
static void
toshiba_rbtx4938_irq_ioc_disable(unsigned int irq)
{
unsigned char v;
v = readb(rbtx4938_imask_addr);
v &= ~(1 << (irq - TOSHIBA_RBTX4938_IRQ_IOC_BEG));
writeb(v, rbtx4938_imask_addr);
mmiowb();
}
void __init arch_init_irq(void)
{
extern void tx4938_irq_init(void);
/* Now, interrupt control disabled, */
/* all IRC interrupts are masked, */
/* all IRC interrupt mode are Low Active. */
/* mask all IOC interrupts */
writeb(0, rbtx4938_imask_addr);
/* clear SoftInt interrupts */
writeb(0, rbtx4938_softint_addr);
tx4938_irq_init();
toshiba_rbtx4938_irq_ioc_init();
/* Onboard 10M Ether: High Active */
set_irq_type(RBTX4938_IRQ_ETHER, IRQF_TRIGGER_HIGH);
}
