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/kernel_stat.h> 14 #include <linux/errno.h> 15 #include <linux/init.h> 16 17 #include <asm/setup.h> 18 #include <asm/system.h> 19 #include <asm/irq.h> 20 #include <asm/traps.h> 21 #include <asm/page.h> 22 #include <asm/machdep.h> 23 #include <asm/cacheflush.h> 24 #include <asm/irq_regs.h> 25 26 #ifdef CONFIG_Q40 27 #include <asm/q40ints.h> 28 #endif 29 30 extern u32 auto_irqhandler_fixup[]; 31 extern u16 user_irqvec_fixup[]; 32 33 static int m68k_first_user_vec; 34 35 static struct irq_chip auto_irq_chip = { 36 .name = "auto", 37 .irq_startup = m68k_irq_startup, 38 .irq_shutdown = m68k_irq_shutdown, 39 }; 40 41 static struct irq_chip user_irq_chip = { 42 .name = "user", 43 .irq_startup = m68k_irq_startup, 44 .irq_shutdown = m68k_irq_shutdown, 45 }; 46 47 /* 48 * void init_IRQ(void) 49 * 50 * Parameters: None 51 * 52 * Returns: Nothing 53 * 54 * This function should be called during kernel startup to initialize 55 * the IRQ handling routines. 56 */ 57 58 void __init init_IRQ(void) 59 { 60 int i; 61 62 /* assembly irq entry code relies on this... */ 63 if (HARDIRQ_MASK != 0x00ff0000) { 64 extern void hardirq_mask_is_broken(void); 65 hardirq_mask_is_broken(); 66 } 67 68 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) 69 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq); 70 71 mach_init_IRQ(); 72 } 73 74 /** 75 * m68k_setup_auto_interrupt 76 * @handler: called from auto vector interrupts 77 * 78 * setup the handler to be called from auto vector interrupts instead of the 79 * standard do_IRQ(), it will be called with irq numbers in the range 80 * from IRQ_AUTO_1 - IRQ_AUTO_7. 81 */ 82 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *)) 83 { 84 if (handler) 85 *auto_irqhandler_fixup = (u32)handler; 86 flush_icache(); 87 } 88 89 /** 90 * m68k_setup_user_interrupt 91 * @vec: first user vector interrupt to handle 92 * @cnt: number of active user vector interrupts 93 * 94 * setup user vector interrupts, this includes activating the specified range 95 * of interrupts, only then these interrupts can be requested (note: this is 96 * different from auto vector interrupts). 97 */ 98 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt) 99 { 100 int i; 101 102 BUG_ON(IRQ_USER + cnt > NR_IRQS); 103 m68k_first_user_vec = vec; 104 for (i = 0; i < cnt; i++) 105 irq_set_chip(IRQ_USER + i, &user_irq_chip); 106 *user_irqvec_fixup = vec - IRQ_USER; 107 flush_icache(); 108 } 109 110 /** 111 * m68k_setup_irq_controller 112 * @chip: irq chip which controls specified irq 113 * @handle: flow handler which handles specified irq 114 * @irq: first irq to be managed by the controller 115 * @cnt: number of irqs to be managed by the controller 116 * 117 * Change the controller for the specified range of irq, which will be used to 118 * manage these irq. auto/user irq already have a default controller, which can 119 * be changed as well, but the controller probably should use m68k_irq_startup/ 120 * m68k_irq_shutdown. 121 */ 122 void m68k_setup_irq_controller(struct irq_chip *chip, 123 irq_flow_handler_t handle, unsigned int irq, 124 unsigned int cnt) 125 { 126 int i; 127 128 for (i = 0; i < cnt; i++) { 129 irq_set_chip(irq + i, chip); 130 if (handle) 131 irq_set_handler(irq + i, handle); 132 } 133 } 134 135 unsigned int m68k_irq_startup_irq(unsigned int irq) 136 { 137 if (irq <= IRQ_AUTO_7) 138 vectors[VEC_SPUR + irq] = auto_inthandler; 139 else 140 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler; 141 return 0; 142 } 143 144 unsigned int m68k_irq_startup(struct irq_data *data) 145 { 146 return m68k_irq_startup_irq(data->irq); 147 } 148 149 void m68k_irq_shutdown(struct irq_data *data) 150 { 151 unsigned int irq = data->irq; 152 153 if (irq <= IRQ_AUTO_7) 154 vectors[VEC_SPUR + irq] = bad_inthandler; 155 else 156 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler; 157 } 158 159 160 unsigned int irq_canonicalize(unsigned int irq) 161 { 162 #ifdef CONFIG_Q40 163 if (MACH_IS_Q40 && irq == 11) 164 irq = 10; 165 #endif 166 return irq; 167 } 168 169 EXPORT_SYMBOL(irq_canonicalize); 170 171 172 asmlinkage void handle_badint(struct pt_regs *regs) 173 { 174 atomic_inc(&irq_err_count); 175 pr_warn("unexpected interrupt from %u\n", regs->vector); 176 } 177