projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 5f97f7f9 HS |
1 | /* |
| 2 | * Copyright (C) 2006 Atmel Corporation | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/clk.h> | |
| 10 | #include <linux/err.h> | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/interrupt.h> | |
| 13 | #include <linux/irq.h> | |
| 14 | #include <linux/platform_device.h> | |
| 15 | ||
| 16 | #include <asm/io.h> | |
| 17 | ||
| 18 | #include "intc.h" | |
| 19 | ||
| 20 | struct intc { | |
| 21 | void __iomem *regs; | |
| 22 | struct irq_chip chip; | |
| 23 | }; | |
| 24 | ||
| 25 | extern struct platform_device at32_intc0_device; | |
| 26 | ||
| 27 | /* | |
| 28 | * TODO: We may be able to implement mask/unmask by setting IxM flags | |
| 29 | * in the status register. | |
| 30 | */ | |
| 31 | static void intc_mask_irq(unsigned int irq) | |
| 32 | { | |
| 33 | ||
| 34 | } | |
| 35 | ||
| 36 | static void intc_unmask_irq(unsigned int irq) | |
| 37 | { | |
| 38 | ||
| 39 | } | |
| 40 | ||
| 41 | static struct intc intc0 = { | |
| 42 | .chip = { | |
| 43 | .name = "intc", | |
| 44 | .mask = intc_mask_irq, | |
| 45 | .unmask = intc_unmask_irq, | |
| 46 | }, | |
| 47 | }; | |
| 48 | ||
| 49 | /* | |
| 50 | * All interrupts go via intc at some point. | |
| 51 | */ | |
| 52 | asmlinkage void do_IRQ(int level, struct pt_regs *regs) | |
| 53 | { | |
| 54 | struct irq_desc *desc; | |
| 55 | unsigned int irq; | |
| 56 | unsigned long status_reg; | |
| 57 | ||
| 58 | local_irq_disable(); | |
| 59 | ||
| 60 | irq_enter(); | |
| 61 | ||
| 62 | irq = intc_readl(&intc0, INTCAUSE0 - 4 * level); | |
| 63 | desc = irq_desc + irq; | |
| 64 | desc->handle_irq(irq, desc, regs); | |
| 65 | ||
| 66 | /* | |
| 67 | * Clear all interrupt level masks so that we may handle | |
| 68 | * interrupts during softirq processing. If this is a nested | |
| 69 | * interrupt, interrupts must stay globally disabled until we | |
| 70 | * return. | |
| 71 | */ | |
| 72 | status_reg = sysreg_read(SR); | |
| 73 | status_reg &= ~(SYSREG_BIT(I0M) | SYSREG_BIT(I1M) | |
| 74 | | SYSREG_BIT(I2M) | SYSREG_BIT(I3M)); | |
| 75 | sysreg_write(SR, status_reg); | |
| 76 | ||
| 77 | irq_exit(); | |
| 78 | } | |
| 79 | ||
| 80 | void __init init_IRQ(void) | |
| 81 | { | |
| 82 | extern void _evba(void); | |
| 83 | extern void irq_level0(void); | |
| 84 | struct resource *regs; | |
| 85 | struct clk *pclk; | |
| 86 | unsigned int i; | |
| 87 | u32 offset, readback; | |
| 88 | ||
| 89 | regs = platform_get_resource(&at32_intc0_device, IORESOURCE_MEM, 0); | |
| 90 | if (!regs) { | |
| 91 | printk(KERN_EMERG "intc: no mmio resource defined\n"); | |
| 92 | goto fail; | |
| 93 | } | |
| 94 | pclk = clk_get(&at32_intc0_device.dev, "pclk"); | |
| 95 | if (IS_ERR(pclk)) { | |
| 96 | printk(KERN_EMERG "intc: no clock defined\n"); | |
| 97 | goto fail; | |
| 98 | } | |
| 99 | ||
| 100 | clk_enable(pclk); | |
| 101 | ||
| 102 | intc0.regs = ioremap(regs->start, regs->end - regs->start + 1); | |
| 103 | if (!intc0.regs) { | |
| 104 | printk(KERN_EMERG "intc: failed to map registers (0x%08lx)\n", | |
| 105 | (unsigned long)regs->start); | |
| 106 | goto fail; | |
| 107 | } | |
| 108 | ||
| 109 | /* | |
| 110 | * Initialize all interrupts to level 0 (lowest priority). The | |
| 111 | * priority level may be changed by calling | |
| 112 | * irq_set_priority(). | |
| 113 | * | |
| 114 | */ | |
| 115 | offset = (unsigned long)&irq_level0 - (unsigned long)&_evba; | |
| 116 | for (i = 0; i < NR_INTERNAL_IRQS; i++) { | |
| 117 | intc_writel(&intc0, INTPR0 + 4 * i, offset); | |
| 118 | readback = intc_readl(&intc0, INTPR0 + 4 * i); | |
| 119 | if (readback == offset) | |
| 120 | set_irq_chip_and_handler(i, &intc0.chip, | |
| 121 | handle_simple_irq); | |
| 122 | } | |
| 123 | ||
| 124 | /* Unmask all interrupt levels */ | |
| 125 | sysreg_write(SR, (sysreg_read(SR) | |
| 126 | & ~(SR_I3M | SR_I2M | SR_I1M | SR_I0M))); | |
| 127 | ||
| 128 | return; | |
| 129 | ||
| 130 | fail: | |
| 131 | panic("Interrupt controller initialization failed!\n"); | |
| 132 | } | |
| 133 |