/* * Toshiba RBTX4939 interrupt routines * Based on linux/arch/mips/txx9/rbtx4938/irq.c, * and RBTX49xx patch from CELF patch archive. * * Copyright (C) 2000-2001,2005-2006 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. */ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <asm/mipsregs.h> #include <asm/txx9/rbtx4939.h> /* * RBTX4939 IOC controller definition */ static void rbtx4939_ioc_irq_unmask(struct irq_data *d) { int ioc_nr = d->irq - RBTX4939_IRQ_IOC; writeb(readb(rbtx4939_ien_addr) | (1 << ioc_nr), rbtx4939_ien_addr); } static void rbtx4939_ioc_irq_mask(struct irq_data *d) { int ioc_nr = d->irq - RBTX4939_IRQ_IOC; writeb(readb(rbtx4939_ien_addr) & ~(1 << ioc_nr), rbtx4939_ien_addr); mmiowb(); } static struct irq_chip rbtx4939_ioc_irq_chip = { .name = "IOC", .irq_mask = rbtx4939_ioc_irq_mask, .irq_unmask = rbtx4939_ioc_irq_unmask, }; static inline int rbtx4939_ioc_irqroute(void) { unsigned char istat = readb(rbtx4939_ifac2_addr); if (unlikely(istat == 0)) return -1; return RBTX4939_IRQ_IOC + __fls8(istat); } static int rbtx4939_irq_dispatch(int pending) { int irq; if (pending & CAUSEF_IP7) return MIPS_CPU_IRQ_BASE + 7; irq = tx4939_irq(); if (likely(irq >= 0)) { /* redirect IOC interrupts */ switch (irq) { case RBTX4939_IRQ_IOCINT: irq = rbtx4939_ioc_irqroute(); break; } } else if (pending & CAUSEF_IP0) irq = MIPS_CPU_IRQ_BASE + 0; else if (pending & CAUSEF_IP1) irq = MIPS_CPU_IRQ_BASE + 1; else irq = -1; return irq; } void __init rbtx4939_irq_setup(void) { int i; /* mask all IOC interrupts */ writeb(0, rbtx4939_ien_addr); /* clear SoftInt interrupts */ writeb(0, rbtx4939_softint_addr); txx9_irq_dispatch = rbtx4939_irq_dispatch; tx4939_irq_init(); for (i = RBTX4939_IRQ_IOC; i < RBTX4939_IRQ_IOC + RBTX4939_NR_IRQ_IOC; i++) irq_set_chip_and_handler(i, &rbtx4939_ioc_irq_chip, handle_level_irq); irq_set_chained_handler(RBTX4939_IRQ_IOCINT, handle_simple_irq); }