/* * linux/arch/arm/mach-omap2/irq.c * * Interrupt handler for OMAP2 boards. * * Copyright (C) 2005 Nokia Corporation * Author: Paul Mundt <paul.mundt@nokia.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <mach/hardware.h> #include <asm/mach/irq.h> /* selected INTC register offsets */ #define INTC_REVISION 0x0000 #define INTC_SYSCONFIG 0x0010 #define INTC_SYSSTATUS 0x0014 #define INTC_SIR 0x0040 #define INTC_CONTROL 0x0048 #define INTC_MIR_CLEAR0 0x0088 #define INTC_MIR_SET0 0x008c #define INTC_PENDING_IRQ0 0x0098 /* Number of IRQ state bits in each MIR register */ #define IRQ_BITS_PER_REG 32 /* * OMAP2 has a number of different interrupt controllers, each interrupt * controller is identified as its own "bank". Register definitions are * fairly consistent for each bank, but not all registers are implemented * for each bank.. when in doubt, consult the TRM. */ static struct omap_irq_bank { void __iomem *base_reg; unsigned int nr_irqs; } __attribute__ ((aligned(4))) irq_banks[] = { { /* MPU INTC */ .base_reg = 0, .nr_irqs = 96, }, }; /* INTC bank register get/set */ static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg) { __raw_writel(val, bank->base_reg + reg); } static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg) { return __raw_readl(bank->base_reg + reg); } static int previous_irq; /* * On 34xx we can get occasional spurious interrupts if the ack from * an interrupt handler does not get posted before we unmask. Warn about * the interrupt handlers that need to flush posted writes. */ static int omap_check_spurious(unsigned int irq) { u32 sir, spurious; sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR); spurious = sir >> 7; if (spurious) { printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush " "posted write for irq %i\n", irq, sir, previous_irq); return spurious; } return 0; } /* XXX: FIQ and additional INTC support (only MPU at the moment) */ static void omap_ack_irq(unsigned int irq) { intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL); } static void omap_mask_irq(unsigned int irq) { int offset = irq & (~(IRQ_BITS_PER_REG - 1)); if (cpu_is_omap34xx()) { int spurious = 0; /* * INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because * it is the highest irq number? */ if (irq == INT_34XX_GPT12_IRQ) spurious = omap_check_spurious(irq); if (!spurious) previous_irq = irq; } irq &= (IRQ_BITS_PER_REG - 1); intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset); } static void omap_unmask_irq(unsigned int irq) { int offset = irq & (~(IRQ_BITS_PER_REG - 1)); irq &= (IRQ_BITS_PER_REG - 1); intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset); } static void omap_mask_ack_irq(unsigned int irq) { omap_mask_irq(irq); omap_ack_irq(irq); } static struct irq_chip omap_irq_chip = { .name = "INTC", .ack = omap_mask_ack_irq, .mask = omap_mask_irq, .unmask = omap_unmask_irq, .disable = omap_mask_irq, }; static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank) { unsigned long tmp; tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff; printk(KERN_INFO "IRQ: Found an INTC at 0x%p " "(revision %ld.%ld) with %d interrupts\n", bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs); tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG); tmp |= 1 << 1; /* soft reset */ intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG); while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1)) /* Wait for reset to complete */; /* Enable autoidle */ intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG); } void __init omap_init_irq(void) { unsigned long nr_of_irqs = 0; unsigned int nr_banks = 0; int i; for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { struct omap_irq_bank *bank = irq_banks + i; if (cpu_is_omap24xx()) bank->base_reg = OMAP2_IO_ADDRESS(OMAP24XX_IC_BASE); else if (cpu_is_omap34xx()) bank->base_reg = OMAP2_IO_ADDRESS(OMAP34XX_IC_BASE); omap_irq_bank_init_one(bank); nr_of_irqs += bank->nr_irqs; nr_banks++; } printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n", nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : ""); for (i = 0; i < nr_of_irqs; i++) { set_irq_chip(i, &omap_irq_chip); set_irq_handler(i, handle_level_irq); set_irq_flags(i, IRQF_VALID); } }