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/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 57 void __init init_IRQ(void) 58 { 59 int i; 60 61 /* assembly irq entry code relies on this... */ 62 if (HARDIRQ_MASK != 0x00ff0000) { 63 extern void hardirq_mask_is_broken(void); 64 hardirq_mask_is_broken(); 65 } 66 67 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) 68 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq); 69 70 mach_init_IRQ(); 71 } 72 73 /** 74 * m68k_setup_auto_interrupt 75 * @handler: called from auto vector interrupts 76 * 77 * setup the handler to be called from auto vector interrupts instead of the 78 * standard do_IRQ(), it will be called with irq numbers in the range 79 * from IRQ_AUTO_1 - IRQ_AUTO_7. 80 */ 81 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *)) 82 { 83 if (handler) 84 *auto_irqhandler_fixup = (u32)handler; 85 flush_icache(); 86 } 87 88 /** 89 * m68k_setup_user_interrupt 90 * @vec: first user vector interrupt to handle 91 * @cnt: number of active user vector interrupts 92 * 93 * setup user vector interrupts, this includes activating the specified range 94 * of interrupts, only then these interrupts can be requested (note: this is 95 * different from auto vector interrupts). 96 */ 97 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt) 98 { 99 int i; 100 101 BUG_ON(IRQ_USER + cnt > NR_IRQS); 102 m68k_first_user_vec = vec; 103 for (i = 0; i < cnt; i++) 104 irq_set_chip(IRQ_USER + i, &user_irq_chip); 105 *user_irqvec_fixup = vec - IRQ_USER; 106 flush_icache(); 107 } 108 109 /** 110 * m68k_setup_irq_controller 111 * @chip: irq chip which controls specified irq 112 * @handle: flow handler which handles specified irq 113 * @irq: first irq to be managed by the controller 114 * @cnt: number of irqs to be managed by the controller 115 * 116 * Change the controller for the specified range of irq, which will be used to 117 * manage these irq. auto/user irq already have a default controller, which can 118 * be changed as well, but the controller probably should use m68k_irq_startup/ 119 * m68k_irq_shutdown. 120 */ 121 void m68k_setup_irq_controller(struct irq_chip *chip, 122 irq_flow_handler_t handle, unsigned int irq, 123 unsigned int cnt) 124 { 125 int i; 126 127 for (i = 0; i < cnt; i++) { 128 irq_set_chip(irq + i, chip); 129 if (handle) 130 irq_set_handler(irq + i, handle); 131 } 132 } 133 134 unsigned int m68k_irq_startup_irq(unsigned int irq) 135 { 136 if (irq <= IRQ_AUTO_7) 137 vectors[VEC_SPUR + irq] = auto_inthandler; 138 else 139 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler; 140 return 0; 141 } 142 143 unsigned int m68k_irq_startup(struct irq_data *data) 144 { 145 return m68k_irq_startup_irq(data->irq); 146 } 147 148 void m68k_irq_shutdown(struct irq_data *data) 149 { 150 unsigned int irq = data->irq; 151 152 if (irq <= IRQ_AUTO_7) 153 vectors[VEC_SPUR + irq] = bad_inthandler; 154 else 155 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler; 156 } 157 158 159 unsigned int irq_canonicalize(unsigned int irq) 160 { 161 #ifdef CONFIG_Q40 162 if (MACH_IS_Q40 && irq == 11) 163 irq = 10; 164 #endif 165 return irq; 166 } 167 168 EXPORT_SYMBOL(irq_canonicalize); 169 170 171 asmlinkage void handle_badint(struct pt_regs *regs) 172 { 173 atomic_inc(&irq_err_count); 174 pr_warn("unexpected interrupt from %u\n", regs->vector); 175 } 176