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(struct irq_data *d)
24 int ioc_nr = d->irq - RBTX4939_IRQ_IOC;
26 writeb(readb(rbtx4939_ien_addr) | (1 << ioc_nr), rbtx4939_ien_addr);
29 static void rbtx4939_ioc_irq_mask(struct irq_data *d)
31 int ioc_nr = d->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 .irq_mask = rbtx4939_ioc_irq_mask,
40 .irq_unmask = rbtx4939_ioc_irq_unmask,
44 static inline int rbtx4939_ioc_irqroute(void)
46 unsigned char istat = readb(rbtx4939_ifac2_addr);
48 if (unlikely(istat == 0))
50 return RBTX4939_IRQ_IOC + __fls8(istat);
53 static int rbtx4939_irq_dispatch(int pending)
57 if (pending & CAUSEF_IP7)
58 return MIPS_CPU_IRQ_BASE + 7;
60 if (likely(irq >= 0)) {
61 /* redirect IOC interrupts */
63 case RBTX4939_IRQ_IOCINT:
64 irq = rbtx4939_ioc_irqroute();
67 } else if (pending & CAUSEF_IP0)
68 irq = MIPS_CPU_IRQ_BASE + 0;
69 else if (pending & CAUSEF_IP1)
70 irq = MIPS_CPU_IRQ_BASE + 1;
76 void __init rbtx4939_irq_setup(void)
80 /* mask all IOC interrupts */
81 writeb(0, rbtx4939_ien_addr);
83 /* clear SoftInt interrupts */
84 writeb(0, rbtx4939_softint_addr);
86 txx9_irq_dispatch = rbtx4939_irq_dispatch;
89 for (i = RBTX4939_IRQ_IOC;
90 i < RBTX4939_IRQ_IOC + RBTX4939_NR_IRQ_IOC; i++)
91 irq_set_chip_and_handler(i, &rbtx4939_ioc_irq_chip,
94 irq_set_chained_handler(RBTX4939_IRQ_IOCINT, handle_simple_irq);