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; 35static uint32_t jz_intc_wakeup; 36static uint32_t jz_intc_saved; 37 38#define JZ_REG_INTC_STATUS 0x00 39#define JZ_REG_INTC_MASK 0x04 40#define JZ_REG_INTC_SET_MASK 0x08 41#define JZ_REG_INTC_CLEAR_MASK 0x0c 42#define JZ_REG_INTC_PENDING 0x10 43 44#define IRQ_BIT(x) BIT((x) - JZ4740_IRQ_BASE) 45 46static void intc_irq_unmask(unsigned int irq) 47{ 48 writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_CLEAR_MASK); 49} 50 51static void intc_irq_mask(unsigned int irq) 52{ 53 writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_SET_MASK); 54} 55 56static int intc_irq_set_wake(unsigned int irq, unsigned int on) 57{ 58 if (on) 59 jz_intc_wakeup |= IRQ_BIT(irq); 60 else 61 jz_intc_wakeup &= ~IRQ_BIT(irq); 62 63 return 0; 64} 65 66static struct irq_chip intc_irq_type = { 67 .name = "INTC", 68 .mask = intc_irq_mask, 69 .mask_ack = intc_irq_mask, 70 .unmask = intc_irq_unmask, 71 .set_wake = intc_irq_set_wake, 72}; 73 74static irqreturn_t jz4740_cascade(int irq, void *data) 75{ 76 uint32_t irq_reg; 77 78 irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING); 79 80 if (irq_reg) 81 generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE); 82 83 return IRQ_HANDLED; 84} 85 86static struct irqaction jz4740_cascade_action = { 87 .handler = jz4740_cascade, 88 .name = "JZ4740 cascade interrupt", 89}; 90 91void __init arch_init_irq(void) 92{ 93 int i; 94 mips_cpu_irq_init(); 95 96 jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14); 97 98 for (i = JZ4740_IRQ_BASE; i < JZ4740_IRQ_BASE + 32; i++) { 99 intc_irq_mask(i); 100 set_irq_chip_and_handler(i, &intc_irq_type, handle_level_irq); 101 } 102 103 setup_irq(2, &jz4740_cascade_action); 104} 105 106asmlinkage void plat_irq_dispatch(void) 107{ 108 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; 109 if (pending & STATUSF_IP2) 110 do_IRQ(2); 111 else if (pending & STATUSF_IP3) 112 do_IRQ(3); 113 else 114 spurious_interrupt(); 115} 116 117void jz4740_intc_suspend(void) 118{ 119 jz_intc_saved = readl(jz_intc_base + JZ_REG_INTC_MASK); 120 writel(~jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_SET_MASK); 121 writel(jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); 122} 123 124void jz4740_intc_resume(void) 125{ 126 writel(~jz_intc_saved, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); 127 writel(jz_intc_saved, jz_intc_base + JZ_REG_INTC_SET_MASK); 128} 129 130#ifdef CONFIG_DEBUG_FS 131 132static inline void intc_seq_reg(struct seq_file *s, const char *name, 133 unsigned int reg) 134{ 135 seq_printf(s, "%s:\t\t%08x\n", name, readl(jz_intc_base + reg)); 136} 137 138static int intc_regs_show(struct seq_file *s, void *unused) 139{ 140 intc_seq_reg(s, "Status", JZ_REG_INTC_STATUS); 141 intc_seq_reg(s, "Mask", JZ_REG_INTC_MASK); 142 intc_seq_reg(s, "Pending", JZ_REG_INTC_PENDING); 143 144 return 0; 145} 146 147static int intc_regs_open(struct inode *inode, struct file *file) 148{ 149 return single_open(file, intc_regs_show, NULL); 150} 151 152static const struct file_operations intc_regs_operations = { 153 .open = intc_regs_open, 154 .read = seq_read, 155 .llseek = seq_lseek, 156 .release = single_release, 157}; 158 159static int __init intc_debugfs_init(void) 160{ 161 (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO, 162 NULL, NULL, &intc_regs_operations); 163 return 0; 164} 165subsys_initcall(intc_debugfs_init); 166 167#endif 168