165 lines
4.3 KiB
C
165 lines
4.3 KiB
C
/*
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* Interrupt handler for DaVinci boards.
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*
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* Copyright (C) 2006 Texas Instruments.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/cputype.h>
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#include <mach/common.h>
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#include <asm/mach/irq.h>
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#define IRQ_BIT(irq) ((irq) & 0x1f)
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#define FIQ_REG0_OFFSET 0x0000
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#define FIQ_REG1_OFFSET 0x0004
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#define IRQ_REG0_OFFSET 0x0008
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#define IRQ_REG1_OFFSET 0x000C
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#define IRQ_ENT_REG0_OFFSET 0x0018
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#define IRQ_ENT_REG1_OFFSET 0x001C
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#define IRQ_INCTL_REG_OFFSET 0x0020
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#define IRQ_EABASE_REG_OFFSET 0x0024
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#define IRQ_INTPRI0_REG_OFFSET 0x0030
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#define IRQ_INTPRI7_REG_OFFSET 0x004C
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static inline unsigned int davinci_irq_readl(int offset)
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{
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return __raw_readl(davinci_intc_base + offset);
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}
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static inline void davinci_irq_writel(unsigned long value, int offset)
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{
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__raw_writel(value, davinci_intc_base + offset);
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}
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/* Disable interrupt */
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static void davinci_mask_irq(unsigned int irq)
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{
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unsigned int mask;
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u32 l;
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mask = 1 << IRQ_BIT(irq);
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if (irq > 31) {
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l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
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l &= ~mask;
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davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
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} else {
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l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
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l &= ~mask;
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davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
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}
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}
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/* Enable interrupt */
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static void davinci_unmask_irq(unsigned int irq)
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{
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unsigned int mask;
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u32 l;
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mask = 1 << IRQ_BIT(irq);
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if (irq > 31) {
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l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
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l |= mask;
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davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
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} else {
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l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
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l |= mask;
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davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
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}
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}
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/* EOI interrupt */
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static void davinci_ack_irq(unsigned int irq)
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{
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unsigned int mask;
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mask = 1 << IRQ_BIT(irq);
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if (irq > 31)
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davinci_irq_writel(mask, IRQ_REG1_OFFSET);
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else
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davinci_irq_writel(mask, IRQ_REG0_OFFSET);
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}
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static struct irq_chip davinci_irq_chip_0 = {
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.name = "AINTC",
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.ack = davinci_ack_irq,
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.mask = davinci_mask_irq,
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.unmask = davinci_unmask_irq,
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};
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/* ARM Interrupt Controller Initialization */
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void __init davinci_irq_init(void)
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{
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unsigned i;
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const u8 *davinci_def_priorities = davinci_soc_info.intc_irq_prios;
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davinci_intc_type = DAVINCI_INTC_TYPE_AINTC;
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davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_4K);
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if (WARN_ON(!davinci_intc_base))
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return;
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/* Clear all interrupt requests */
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davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
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davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
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davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
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davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
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/* Disable all interrupts */
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davinci_irq_writel(0x0, IRQ_ENT_REG0_OFFSET);
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davinci_irq_writel(0x0, IRQ_ENT_REG1_OFFSET);
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/* Interrupts disabled immediately, IRQ entry reflects all */
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davinci_irq_writel(0x0, IRQ_INCTL_REG_OFFSET);
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/* we don't use the hardware vector table, just its entry addresses */
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davinci_irq_writel(0, IRQ_EABASE_REG_OFFSET);
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/* Clear all interrupt requests */
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davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
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davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
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davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
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davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
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for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
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unsigned j;
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u32 pri;
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for (j = 0, pri = 0; j < 32; j += 4, davinci_def_priorities++)
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pri |= (*davinci_def_priorities & 0x07) << j;
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davinci_irq_writel(pri, i);
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}
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/* set up genirq dispatch for ARM INTC */
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for (i = 0; i < davinci_soc_info.intc_irq_num; i++) {
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set_irq_chip(i, &davinci_irq_chip_0);
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set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
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if (i != IRQ_TINT1_TINT34)
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set_irq_handler(i, handle_edge_irq);
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else
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set_irq_handler(i, handle_level_irq);
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}
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}
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