1 /* 2 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file COPYING in the main directory of this archive 6 * for more details. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/sched.h> 12 #include <linux/interrupt.h> 13 #include <linux/errno.h> 14 #include <linux/init.h> 15 #include <linux/irq.h> 16 17 #include <asm/setup.h> 18 #include <asm/irq.h> 19 #include <asm/traps.h> 20 #include <asm/page.h> 21 #include <asm/machdep.h> 22 #include <asm/cacheflush.h> 23 #include <asm/irq_regs.h> 24 25 #ifdef CONFIG_Q40 26 #include <asm/q40ints.h> 27 #endif 28 29 #include "ints.h" 30 31 extern u32 auto_irqhandler_fixup[]; 32 extern u16 user_irqvec_fixup[]; 33 34 static int m68k_first_user_vec; 35 36 static struct irq_chip auto_irq_chip = { 37 .name = "auto", 38 .irq_startup = m68k_irq_startup, 39 .irq_shutdown = m68k_irq_shutdown, 40 }; 41 42 static struct irq_chip user_irq_chip = { 43 .name = "user", 44 .irq_startup = m68k_irq_startup, 45 .irq_shutdown = m68k_irq_shutdown, 46 }; 47 48 /* 49 * void init_IRQ(void) 50 * 51 * Parameters: None 52 * 53 * Returns: Nothing 54 * 55 * This function should be called during kernel startup to initialize 56 * the IRQ handling routines. 57 */ 58 59 void __init init_IRQ(void) 60 { 61 int i; 62 63 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) 64 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq); 65 66 mach_init_IRQ(); 67 } 68 69 /** 70 * m68k_setup_auto_interrupt 71 * @handler: called from auto vector interrupts 72 * 73 * setup the handler to be called from auto vector interrupts instead of the 74 * standard do_IRQ(), it will be called with irq numbers in the range 75 * from IRQ_AUTO_1 - IRQ_AUTO_7. 76 */ 77 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *)) 78 { 79 if (handler) 80 *auto_irqhandler_fixup = (u32)handler; 81 flush_icache(); 82 } 83 84 /** 85 * m68k_setup_user_interrupt 86 * @vec: first user vector interrupt to handle 87 * @cnt: number of active user vector interrupts 88 * 89 * setup user vector interrupts, this includes activating the specified range 90 * of interrupts, only then these interrupts can be requested (note: this is 91 * different from auto vector interrupts). 92 */ 93 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt) 94 { 95 int i; 96 97 BUG_ON(IRQ_USER + cnt > NR_IRQS); 98 m68k_first_user_vec = vec; 99 for (i = 0; i < cnt; i++) 100 irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq); 101 *user_irqvec_fixup = vec - IRQ_USER; 102 flush_icache(); 103 } 104 105 /** 106 * m68k_setup_irq_controller 107 * @chip: irq chip which controls specified irq 108 * @handle: flow handler which handles specified irq 109 * @irq: first irq to be managed by the controller 110 * @cnt: number of irqs to be managed by the controller 111 * 112 * Change the controller for the specified range of irq, which will be used to 113 * manage these irq. auto/user irq already have a default controller, which can 114 * be changed as well, but the controller probably should use m68k_irq_startup/ 115 * m68k_irq_shutdown. 116 */ 117 void m68k_setup_irq_controller(struct irq_chip *chip, 118 irq_flow_handler_t handle, unsigned int irq, 119 unsigned int cnt) 120 { 121 int i; 122 123 for (i = 0; i < cnt; i++) { 124 irq_set_chip(irq + i, chip); 125 if (handle) 126 irq_set_handler(irq + i, handle); 127 } 128 } 129 130 unsigned int m68k_irq_startup_irq(unsigned int irq) 131 { 132 if (irq <= IRQ_AUTO_7) 133 vectors[VEC_SPUR + irq] = auto_inthandler; 134 else 135 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler; 136 return 0; 137 } 138 139 unsigned int m68k_irq_startup(struct irq_data *data) 140 { 141 return m68k_irq_startup_irq(data->irq); 142 } 143 144 void m68k_irq_shutdown(struct irq_data *data) 145 { 146 unsigned int irq = data->irq; 147 148 if (irq <= IRQ_AUTO_7) 149 vectors[VEC_SPUR + irq] = bad_inthandler; 150 else 151 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler; 152 } 153 154 155 unsigned int irq_canonicalize(unsigned int irq) 156 { 157 #ifdef CONFIG_Q40 158 if (MACH_IS_Q40 && irq == 11) 159 irq = 10; 160 #endif 161 return irq; 162 } 163 164 EXPORT_SYMBOL(irq_canonicalize); 165 166 167 asmlinkage void handle_badint(struct pt_regs *regs) 168 { 169 atomic_inc(&irq_err_count); 170 pr_warn("unexpected interrupt from %u\n", regs->vector); 171 } 172