/* irq-mb93493.c: MB93493 companion chip interrupt handler * * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/ptrace.h> #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/irq.h> #include <linux/bitops.h> #include <asm/io.h> #include <asm/delay.h> #include <asm/irq.h> #include <asm/irc-regs.h> #include <asm/mb93493-irqs.h> #include <asm/mb93493-regs.h> #define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493)) #define IRQ_ROUTING \ (IRQ_ROUTE_ONE(IRQ_MB93493_VDC) | \ IRQ_ROUTE_ONE(IRQ_MB93493_VCC) | \ IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) | \ IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) | \ IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) | \ IRQ_ROUTE_ONE(IRQ_MB93493_USB) | \ IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) | \ IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) | \ IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) | \ IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN)) /* * daughter board PIC operations * - there is no way to ACK interrupts in the MB93493 chip */ static void frv_mb93493_mask(struct irq_data *d) { uint32_t iqsr; volatile void *piqsr; if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493))) piqsr = __addr_MB93493_IQSR(1); else piqsr = __addr_MB93493_IQSR(0); iqsr = readl(piqsr); iqsr &= ~(1 << (d->irq - IRQ_BASE_MB93493 + 16)); writel(iqsr, piqsr); } static void frv_mb93493_ack(struct irq_data *d) { } static void frv_mb93493_unmask(struct irq_data *d) { uint32_t iqsr; volatile void *piqsr; if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493))) piqsr = __addr_MB93493_IQSR(1); else piqsr = __addr_MB93493_IQSR(0); iqsr = readl(piqsr); iqsr |= 1 << (d->irq - IRQ_BASE_MB93493 + 16); writel(iqsr, piqsr); } static struct irq_chip frv_mb93493_pic = { .name = "mb93093", .irq_ack = frv_mb93493_ack, .irq_mask = frv_mb93493_mask, .irq_mask_ack = frv_mb93493_mask, .irq_unmask = frv_mb93493_unmask, }; /* * MB93493 PIC interrupt handler */ static irqreturn_t mb93493_interrupt(int irq, void *_piqsr) { volatile void *piqsr = _piqsr; uint32_t iqsr; iqsr = readl(piqsr); iqsr = iqsr & (iqsr >> 16) & 0xffff; /* poll all the triggered IRQs */ while (iqsr) { int irq; asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr)); irq = 31 - irq; iqsr &= ~(1 << irq); generic_handle_irq(IRQ_BASE_MB93493 + irq); } return IRQ_HANDLED; } /* * define an interrupt action for each MB93493 PIC output * - use dev_id to indicate the MB93493 PIC input to output mappings */ static struct irqaction mb93493_irq[2] = { [0] = { .handler = mb93493_interrupt, .flags = IRQF_SHARED, .name = "mb93493.0", .dev_id = (void *) __addr_MB93493_IQSR(0), }, [1] = { .handler = mb93493_interrupt, .flags = IRQF_SHARED, .name = "mb93493.1", .dev_id = (void *) __addr_MB93493_IQSR(1), } }; /* * initialise the motherboard MB93493's PIC */ void __init mb93493_init(void) { int irq; for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++) irq_set_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq); /* the MB93493 drives external IRQ inputs on the CPU PIC */ setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]); setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]); }