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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | /* * linux/arch/h8300/kernel/irq.c * * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp> */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/kernel_stat.h> #include <linux/seq_file.h> #include <linux/init.h> #include <linux/random.h> #include <linux/bootmem.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <asm/system.h> #include <asm/traps.h> #include <asm/io.h> #include <asm/setup.h> #include <asm/errno.h> /*#define DEBUG*/ extern unsigned long *interrupt_redirect_table; extern const int h8300_saved_vectors[]; extern const h8300_vector h8300_trap_table[]; int h8300_enable_irq_pin(unsigned int irq); void h8300_disable_irq_pin(unsigned int irq); #define CPU_VECTOR ((unsigned long *)0x000000) #define ADDR_MASK (0xffffff) static inline int is_ext_irq(unsigned int irq) { return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS)); } static void h8300_enable_irq(struct irq_data *data) { if (is_ext_irq(data->irq)) IER_REGS |= 1 << (data->irq - EXT_IRQ0); } static void h8300_disable_irq(struct irq_data *data) { if (is_ext_irq(data->irq)) IER_REGS &= ~(1 << (data->irq - EXT_IRQ0)); } static unsigned int h8300_startup_irq(struct irq_data *data) { if (is_ext_irq(data->irq)) return h8300_enable_irq_pin(data->irq); else return 0; } static void h8300_shutdown_irq(struct irq_data *data) { if (is_ext_irq(data->irq)) h8300_disable_irq_pin(data->irq); } /* * h8300 interrupt controller implementation */ struct irq_chip h8300irq_chip = { .name = "H8300-INTC", .irq_startup = h8300_startup_irq, .irq_shutdown = h8300_shutdown_irq, .irq_enable = h8300_enable_irq, .irq_disable = h8300_disable_irq, }; #if defined(CONFIG_RAMKERNEL) static unsigned long __init *get_vector_address(void) { unsigned long *rom_vector = CPU_VECTOR; unsigned long base,tmp; int vec_no; base = rom_vector[EXT_IRQ0] & ADDR_MASK; /* check romvector format */ for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) { if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK)) return NULL; } /* ramvector base address */ base -= EXT_IRQ0*4; /* writerble check */ tmp = ~(*(volatile unsigned long *)base); (*(volatile unsigned long *)base) = tmp; if ((*(volatile unsigned long *)base) != tmp) return NULL; return (unsigned long *)base; } static void __init setup_vector(void) { int i; unsigned long *ramvec,*ramvec_p; const h8300_vector *trap_entry; const int *saved_vector; ramvec = get_vector_address(); if (ramvec == NULL) panic("interrupt vector serup failed."); else printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec); /* create redirect table */ ramvec_p = ramvec; trap_entry = h8300_trap_table; saved_vector = h8300_saved_vectors; for ( i = 0; i < NR_IRQS; i++) { if (i == *saved_vector) { ramvec_p++; saved_vector++; } else { if ( i < NR_TRAPS ) { if (*trap_entry) *ramvec_p = VECTOR(*trap_entry); ramvec_p++; trap_entry++; } else *ramvec_p++ = REDIRECT(interrupt_entry); } } interrupt_redirect_table = ramvec; #ifdef DEBUG ramvec_p = ramvec; for (i = 0; i < NR_IRQS; i++) { if ((i % 8) == 0) printk(KERN_DEBUG "\n%p: ",ramvec_p); printk(KERN_DEBUG "%p ",*ramvec_p); ramvec_p++; } printk(KERN_DEBUG "\n"); #endif } #else #define setup_vector() do { } while(0) #endif void __init init_IRQ(void) { int c; setup_vector(); for (c = 0; c < NR_IRQS; c++) irq_set_chip_and_handler(c, &h8300irq_chip, handle_simple_irq); } asmlinkage void do_IRQ(int irq) { irq_enter(); generic_handle_irq(irq); irq_exit(); } |