/* arch/arm/plat-samsung/irq-vic-timer.c * originally part of arch/arm/plat-s3c64xx/irq.c * * Copyright 2008 Openmoko, Inc. * Copyright 2008 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * http://armlinux.simtec.co.uk/ * * S3C64XX - Interrupt handling * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/io.h> #include <mach/map.h> #include <plat/irq-vic-timer.h> #include <plat/regs-timer.h> static void s3c_irq_demux_vic_timer(unsigned int irq, struct irq_desc *desc) { generic_handle_irq((int)desc->handler_data); } /* We assume the IRQ_TIMER0..IRQ_TIMER4 range is continuous. */ static void s3c_irq_timer_mask(unsigned int irq) { u32 reg = __raw_readl(S3C64XX_TINT_CSTAT); reg &= 0x1f; /* mask out pending interrupts */ reg &= ~(1 << (irq - IRQ_TIMER0)); __raw_writel(reg, S3C64XX_TINT_CSTAT); } static void s3c_irq_timer_unmask(unsigned int irq) { u32 reg = __raw_readl(S3C64XX_TINT_CSTAT); reg &= 0x1f; /* mask out pending interrupts */ reg |= 1 << (irq - IRQ_TIMER0); __raw_writel(reg, S3C64XX_TINT_CSTAT); } static void s3c_irq_timer_ack(unsigned int irq) { u32 reg = __raw_readl(S3C64XX_TINT_CSTAT); reg &= 0x1f; reg |= (1 << 5) << (irq - IRQ_TIMER0); __raw_writel(reg, S3C64XX_TINT_CSTAT); } static struct irq_chip s3c_irq_timer = { .name = "s3c-timer", .mask = s3c_irq_timer_mask, .unmask = s3c_irq_timer_unmask, .ack = s3c_irq_timer_ack, }; /** * s3c_init_vic_timer_irq() - initialise timer irq chanined off VIC.\ * @parent_irq: The parent IRQ on the VIC for the timer. * @timer_irq: The IRQ to be used for the timer. * * Register the necessary IRQ chaining and support for the timer IRQs * chained of the VIC. */ void __init s3c_init_vic_timer_irq(unsigned int parent_irq, unsigned int timer_irq) { struct irq_desc *desc = irq_to_desc(parent_irq); set_irq_chained_handler(parent_irq, s3c_irq_demux_vic_timer); set_irq_chip(timer_irq, &s3c_irq_timer); set_irq_handler(timer_irq, handle_level_irq); set_irq_flags(timer_irq, IRQF_VALID); desc->handler_data = (void *)timer_irq; }