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