1/* 2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> 3 * JZ4740 platform IRQ support 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 * 10 * You should have received a copy of the GNU General Public License along 11 * with this program; if not, write to the Free Software Foundation, Inc., 12 * 675 Mass Ave, Cambridge, MA 02139, USA. 13 * 14 */ 15 16#include <linux/errno.h> 17#include <linux/init.h> 18#include <linux/types.h> 19#include <linux/interrupt.h> 20#include <linux/ioport.h> 21#include <linux/timex.h> 22#include <linux/slab.h> 23#include <linux/delay.h> 24 25#include <linux/debugfs.h> 26#include <linux/seq_file.h> 27 28#include <asm/io.h> 29#include <asm/mipsregs.h> 30#include <asm/irq_cpu.h> 31 32#include <asm/mach-jz4740/base.h> 33 34static void __iomem *jz_intc_base; 35 36#define JZ_REG_INTC_STATUS 0x00 37#define JZ_REG_INTC_MASK 0x04 38#define JZ_REG_INTC_SET_MASK 0x08 39#define JZ_REG_INTC_CLEAR_MASK 0x0c 40#define JZ_REG_INTC_PENDING 0x10 41 42static irqreturn_t jz4740_cascade(int irq, void *data) 43{ 44 uint32_t irq_reg; 45 46 irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING); 47 48 if (irq_reg) 49 generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE); 50 51 return IRQ_HANDLED; 52} 53 54static void jz4740_irq_set_mask(struct irq_chip_generic *gc, uint32_t mask) 55{ 56 struct irq_chip_regs *regs = &gc->chip_types->regs; 57 58 writel(mask, gc->reg_base + regs->enable); 59 writel(~mask, gc->reg_base + regs->disable); 60} 61 62void jz4740_irq_suspend(struct irq_data *data) 63{ 64 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 65 jz4740_irq_set_mask(gc, gc->wake_active); 66} 67 68void jz4740_irq_resume(struct irq_data *data) 69{ 70 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 71 jz4740_irq_set_mask(gc, gc->mask_cache); 72} 73 74static struct irqaction jz4740_cascade_action = { 75 .handler = jz4740_cascade, 76 .name = "JZ4740 cascade interrupt", 77}; 78 79void __init arch_init_irq(void) 80{ 81 struct irq_chip_generic *gc; 82 struct irq_chip_type *ct; 83 84 mips_cpu_irq_init(); 85 86 jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14); 87 88 /* Mask all irqs */ 89 writel(0xffffffff, jz_intc_base + JZ_REG_INTC_SET_MASK); 90 91 gc = irq_alloc_generic_chip("INTC", 1, JZ4740_IRQ_BASE, jz_intc_base, 92 handle_level_irq); 93 94 gc->wake_enabled = IRQ_MSK(32); 95 96 ct = gc->chip_types; 97 ct->regs.enable = JZ_REG_INTC_CLEAR_MASK; 98 ct->regs.disable = JZ_REG_INTC_SET_MASK; 99 ct->chip.irq_unmask = irq_gc_unmask_enable_reg; 100 ct->chip.irq_mask = irq_gc_mask_disable_reg; 101 ct->chip.irq_mask_ack = irq_gc_mask_disable_reg; 102 ct->chip.irq_set_wake = irq_gc_set_wake; 103 ct->chip.irq_suspend = jz4740_irq_suspend; 104 ct->chip.irq_resume = jz4740_irq_resume; 105 106 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, IRQ_NOPROBE | IRQ_LEVEL); 107 108 setup_irq(2, &jz4740_cascade_action); 109} 110 111asmlinkage void plat_irq_dispatch(void) 112{ 113 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; 114 if (pending & STATUSF_IP2) 115 do_IRQ(2); 116 else if (pending & STATUSF_IP3) 117 do_IRQ(3); 118 else 119 spurious_interrupt(); 120} 121 122#ifdef CONFIG_DEBUG_FS 123 124static inline void intc_seq_reg(struct seq_file *s, const char *name, 125 unsigned int reg) 126{ 127 seq_printf(s, "%s:\t\t%08x\n", name, readl(jz_intc_base + reg)); 128} 129 130static int intc_regs_show(struct seq_file *s, void *unused) 131{ 132 intc_seq_reg(s, "Status", JZ_REG_INTC_STATUS); 133 intc_seq_reg(s, "Mask", JZ_REG_INTC_MASK); 134 intc_seq_reg(s, "Pending", JZ_REG_INTC_PENDING); 135 136 return 0; 137} 138 139static int intc_regs_open(struct inode *inode, struct file *file) 140{ 141 return single_open(file, intc_regs_show, NULL); 142} 143 144static const struct file_operations intc_regs_operations = { 145 .open = intc_regs_open, 146 .read = seq_read, 147 .llseek = seq_lseek, 148 .release = single_release, 149}; 150 151static int __init intc_debugfs_init(void) 152{ 153 (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO, 154 NULL, NULL, &intc_regs_operations); 155 return 0; 156} 157subsys_initcall(intc_debugfs_init); 158 159#endif 160