2 * Toshiba RBTX4939 interrupt routines
3 * Based on linux/arch/mips/txx9/rbtx4938/irq.c,
4 * and RBTX49xx patch from CELF patch archive.
6 * Copyright (C) 2000-2001,2005-2006 Toshiba Corporation
7 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
8 * terms of the GNU General Public License version 2. This program is
9 * licensed "as is" without any warranty of any kind, whether express
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <asm/mipsregs.h>
16 #include <asm/txx9/rbtx4939.h>
19 * RBTX4939 IOC controller definition
22 static void rbtx4939_ioc_irq_unmask(unsigned int irq)
24 int ioc_nr = irq - RBTX4939_IRQ_IOC;
26 writeb(readb(rbtx4939_ien_addr) | (1 << ioc_nr), rbtx4939_ien_addr);
29 static void rbtx4939_ioc_irq_mask(unsigned int irq)
31 int ioc_nr = irq - RBTX4939_IRQ_IOC;
33 writeb(readb(rbtx4939_ien_addr) & ~(1 << ioc_nr), rbtx4939_ien_addr);
37 static struct irq_chip rbtx4939_ioc_irq_chip = {
39 .ack = rbtx4939_ioc_irq_mask,
40 .mask = rbtx4939_ioc_irq_mask,
41 .mask_ack = rbtx4939_ioc_irq_mask,
42 .unmask = rbtx4939_ioc_irq_unmask,
46 static inline int rbtx4939_ioc_irqroute(void)
48 unsigned char istat = readb(rbtx4939_ifac2_addr);
50 if (unlikely(istat == 0))
52 return RBTX4939_IRQ_IOC + __fls8(istat);
55 static int rbtx4939_irq_dispatch(int pending)
59 if (pending & CAUSEF_IP7)
60 return MIPS_CPU_IRQ_BASE + 7;
62 if (likely(irq >= 0)) {
63 /* redirect IOC interrupts */
65 case RBTX4939_IRQ_IOCINT:
66 irq = rbtx4939_ioc_irqroute();
69 } else if (pending & CAUSEF_IP0)
70 irq = MIPS_CPU_IRQ_BASE + 0;
71 else if (pending & CAUSEF_IP1)
72 irq = MIPS_CPU_IRQ_BASE + 1;
78 void __init rbtx4939_irq_setup(void)
82 /* mask all IOC interrupts */
83 writeb(0, rbtx4939_ien_addr);
85 /* clear SoftInt interrupts */
86 writeb(0, rbtx4939_softint_addr);
88 txx9_irq_dispatch = rbtx4939_irq_dispatch;
91 for (i = RBTX4939_IRQ_IOC;
92 i < RBTX4939_IRQ_IOC + RBTX4939_NR_IRQ_IOC; i++)
93 set_irq_chip_and_handler(i, &rbtx4939_ioc_irq_chip,
96 set_irq_chained_handler(RBTX4939_IRQ_IOCINT, handle_simple_irq);