2 * Toshiba RBTX4938 specific interrupt handlers
3 * Copyright (C) 2000-2001 Toshiba Corporation
5 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
6 * terms of the GNU General Public License version 2. This program is
7 * licensed "as is" without any warranty of any kind, whether express
10 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
14 * MIPS_CPU_IRQ_BASE+00 Software 0
15 * MIPS_CPU_IRQ_BASE+01 Software 1
16 * MIPS_CPU_IRQ_BASE+02 Cascade TX4938-CP0
17 * MIPS_CPU_IRQ_BASE+03 Multiplexed -- do not use
18 * MIPS_CPU_IRQ_BASE+04 Multiplexed -- do not use
19 * MIPS_CPU_IRQ_BASE+05 Multiplexed -- do not use
20 * MIPS_CPU_IRQ_BASE+06 Multiplexed -- do not use
21 * MIPS_CPU_IRQ_BASE+07 CPU TIMER
25 * TXX9_IRQ_BASE+02 Cascade RBTX4938-IOC
26 * TXX9_IRQ_BASE+03 RBTX4938 RTL-8019AS Ethernet
28 * TXX9_IRQ_BASE+05 TX4938 ETH1
29 * TXX9_IRQ_BASE+06 TX4938 ETH0
31 * TXX9_IRQ_BASE+08 TX4938 SIO 0
32 * TXX9_IRQ_BASE+09 TX4938 SIO 1
33 * TXX9_IRQ_BASE+10 TX4938 DMA0
34 * TXX9_IRQ_BASE+11 TX4938 DMA1
35 * TXX9_IRQ_BASE+12 TX4938 DMA2
36 * TXX9_IRQ_BASE+13 TX4938 DMA3
39 * TXX9_IRQ_BASE+16 TX4938 PCIC
40 * TXX9_IRQ_BASE+17 TX4938 TMR0
41 * TXX9_IRQ_BASE+18 TX4938 TMR1
42 * TXX9_IRQ_BASE+19 TX4938 TMR2
45 * TXX9_IRQ_BASE+22 TX4938 PCIERR
54 * TXX9_IRQ_BASE+31 TX4938 SPI
56 * RBTX4938_IRQ_IOC+00 PCI-D
57 * RBTX4938_IRQ_IOC+01 PCI-C
58 * RBTX4938_IRQ_IOC+02 PCI-B
59 * RBTX4938_IRQ_IOC+03 PCI-A
60 * RBTX4938_IRQ_IOC+04 RTC
61 * RBTX4938_IRQ_IOC+05 ATA
62 * RBTX4938_IRQ_IOC+06 MODEM
63 * RBTX4938_IRQ_IOC+07 SWINT
65 #include <linux/init.h>
66 #include <linux/interrupt.h>
67 #include <asm/mipsregs.h>
68 #include <asm/txx9/generic.h>
69 #include <asm/txx9/rbtx4938.h>
71 static void toshiba_rbtx4938_irq_ioc_enable(unsigned int irq);
72 static void toshiba_rbtx4938_irq_ioc_disable(unsigned int irq);
74 #define TOSHIBA_RBTX4938_IOC_NAME "RBTX4938-IOC"
75 static struct irq_chip toshiba_rbtx4938_irq_ioc_type = {
76 .name = TOSHIBA_RBTX4938_IOC_NAME,
77 .ack = toshiba_rbtx4938_irq_ioc_disable,
78 .mask = toshiba_rbtx4938_irq_ioc_disable,
79 .mask_ack = toshiba_rbtx4938_irq_ioc_disable,
80 .unmask = toshiba_rbtx4938_irq_ioc_enable,
83 static int toshiba_rbtx4938_irq_nested(int sw_irq)
87 level3 = readb(rbtx4938_imstat_addr);
89 /* must use fls so onboard ATA has priority */
90 sw_irq = RBTX4938_IRQ_IOC + fls(level3) - 1;
95 toshiba_rbtx4938_irq_ioc_init(void)
99 for (i = RBTX4938_IRQ_IOC;
100 i < RBTX4938_IRQ_IOC + RBTX4938_NR_IRQ_IOC; i++)
101 set_irq_chip_and_handler(i, &toshiba_rbtx4938_irq_ioc_type,
104 set_irq_chained_handler(RBTX4938_IRQ_IOCINT, handle_simple_irq);
108 toshiba_rbtx4938_irq_ioc_enable(unsigned int irq)
112 v = readb(rbtx4938_imask_addr);
113 v |= (1 << (irq - RBTX4938_IRQ_IOC));
114 writeb(v, rbtx4938_imask_addr);
119 toshiba_rbtx4938_irq_ioc_disable(unsigned int irq)
123 v = readb(rbtx4938_imask_addr);
124 v &= ~(1 << (irq - RBTX4938_IRQ_IOC));
125 writeb(v, rbtx4938_imask_addr);
129 static int rbtx4938_irq_dispatch(int pending)
133 if (pending & STATUSF_IP7)
134 irq = MIPS_CPU_IRQ_BASE + 7;
135 else if (pending & STATUSF_IP2) {
137 if (irq == RBTX4938_IRQ_IOCINT)
138 irq = toshiba_rbtx4938_irq_nested(irq);
139 } else if (pending & STATUSF_IP1)
140 irq = MIPS_CPU_IRQ_BASE + 0;
141 else if (pending & STATUSF_IP0)
142 irq = MIPS_CPU_IRQ_BASE + 1;
148 void __init rbtx4938_irq_setup(void)
150 txx9_irq_dispatch = rbtx4938_irq_dispatch;
151 /* Now, interrupt control disabled, */
152 /* all IRC interrupts are masked, */
153 /* all IRC interrupt mode are Low Active. */
155 /* mask all IOC interrupts */
156 writeb(0, rbtx4938_imask_addr);
158 /* clear SoftInt interrupts */
159 writeb(0, rbtx4938_softint_addr);
161 toshiba_rbtx4938_irq_ioc_init();
162 /* Onboard 10M Ether: High Active */
163 set_irq_type(RBTX4938_IRQ_ETHER, IRQF_TRIGGER_HIGH);