1/* 2 * linux/arch/h8300/kernel/irq.c 3 * 4 * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp> 5 */ 6 7#include <linux/module.h> 8#include <linux/types.h> 9#include <linux/kernel.h> 10#include <linux/sched.h> 11#include <linux/kernel_stat.h> 12#include <linux/seq_file.h> 13#include <linux/init.h> 14#include <linux/random.h> 15#include <linux/bootmem.h> 16#include <linux/irq.h> 17#include <linux/interrupt.h> 18 19#include <asm/system.h> 20#include <asm/traps.h> 21#include <asm/io.h> 22#include <asm/setup.h> 23#include <asm/errno.h> 24 25/*#define DEBUG*/ 26 27extern unsigned long *interrupt_redirect_table; 28extern const int h8300_saved_vectors[]; 29extern const h8300_vector h8300_trap_table[]; 30int h8300_enable_irq_pin(unsigned int irq); 31void h8300_disable_irq_pin(unsigned int irq); 32 33#define CPU_VECTOR ((unsigned long *)0x000000) 34#define ADDR_MASK (0xffffff) 35 36static inline int is_ext_irq(unsigned int irq) 37{ 38 return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS)); 39} 40 41static void h8300_enable_irq(unsigned int irq) 42{ 43 if (is_ext_irq(irq)) 44 IER_REGS |= 1 << (irq - EXT_IRQ0); 45} 46 47static void h8300_disable_irq(unsigned int irq) 48{ 49 if (is_ext_irq(irq)) 50 IER_REGS &= ~(1 << (irq - EXT_IRQ0)); 51} 52 53static void h8300_end_irq(unsigned int irq) 54{ 55} 56 57static unsigned int h8300_startup_irq(unsigned int irq) 58{ 59 if (is_ext_irq(irq)) 60 return h8300_enable_irq_pin(irq); 61 else 62 return 0; 63} 64 65static void h8300_shutdown_irq(unsigned int irq) 66{ 67 if (is_ext_irq(irq)) 68 h8300_disable_irq_pin(irq); 69} 70 71/* 72 * h8300 interrupt controller implementation 73 */ 74struct irq_chip h8300irq_chip = { 75 .name = "H8300-INTC", 76 .startup = h8300_startup_irq, 77 .shutdown = h8300_shutdown_irq, 78 .enable = h8300_enable_irq, 79 .disable = h8300_disable_irq, 80 .ack = NULL, 81 .end = h8300_end_irq, 82}; 83 84#if defined(CONFIG_RAMKERNEL) 85static unsigned long __init *get_vector_address(void) 86{ 87 unsigned long *rom_vector = CPU_VECTOR; 88 unsigned long base,tmp; 89 int vec_no; 90 91 base = rom_vector[EXT_IRQ0] & ADDR_MASK; 92 93 /* check romvector format */ 94 for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) { 95 if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK)) 96 return NULL; 97 } 98 99 /* ramvector base address */ 100 base -= EXT_IRQ0*4; 101 102 /* writerble check */ 103 tmp = ~(*(volatile unsigned long *)base); 104 (*(volatile unsigned long *)base) = tmp; 105 if ((*(volatile unsigned long *)base) != tmp) 106 return NULL; 107 return (unsigned long *)base; 108} 109 110static void __init setup_vector(void) 111{ 112 int i; 113 unsigned long *ramvec,*ramvec_p; 114 const h8300_vector *trap_entry; 115 const int *saved_vector; 116 117 ramvec = get_vector_address(); 118 if (ramvec == NULL) 119 panic("interrupt vector serup failed."); 120 else 121 printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec); 122 123 /* create redirect table */ 124 ramvec_p = ramvec; 125 trap_entry = h8300_trap_table; 126 saved_vector = h8300_saved_vectors; 127 for ( i = 0; i < NR_IRQS; i++) { 128 if (i == *saved_vector) { 129 ramvec_p++; 130 saved_vector++; 131 } else { 132 if ( i < NR_TRAPS ) { 133 if (*trap_entry) 134 *ramvec_p = VECTOR(*trap_entry); 135 ramvec_p++; 136 trap_entry++; 137 } else 138 *ramvec_p++ = REDIRECT(interrupt_entry); 139 } 140 } 141 interrupt_redirect_table = ramvec; 142#ifdef DEBUG 143 ramvec_p = ramvec; 144 for (i = 0; i < NR_IRQS; i++) { 145 if ((i % 8) == 0) 146 printk(KERN_DEBUG "\n%p: ",ramvec_p); 147 printk(KERN_DEBUG "%p ",*ramvec_p); 148 ramvec_p++; 149 } 150 printk(KERN_DEBUG "\n"); 151#endif 152} 153#else 154#define setup_vector() do { } while(0) 155#endif 156 157void __init init_IRQ(void) 158{ 159 int c; 160 161 setup_vector(); 162 163 for (c = 0; c < NR_IRQS; c++) { 164 irq_desc[c].status = IRQ_DISABLED; 165 irq_desc[c].action = NULL; 166 irq_desc[c].depth = 1; 167 irq_desc[c].chip = &h8300irq_chip; 168 } 169} 170 171asmlinkage void do_IRQ(int irq) 172{ 173 irq_enter(); 174 __do_IRQ(irq); 175 irq_exit(); 176} 177 178#if defined(CONFIG_PROC_FS) 179int show_interrupts(struct seq_file *p, void *v) 180{ 181 int i = *(loff_t *) v; 182 struct irqaction * action; 183 unsigned long flags; 184 185 if (i == 0) 186 seq_puts(p, " CPU0"); 187 188 if (i < NR_IRQS) { 189 raw_spin_lock_irqsave(&irq_desc[i].lock, flags); 190 action = irq_desc[i].action; 191 if (!action) 192 goto unlock; 193 seq_printf(p, "%3d: ",i); 194 seq_printf(p, "%10u ", kstat_irqs(i)); 195 seq_printf(p, " %14s", irq_desc[i].chip->name); 196 seq_printf(p, "-%-8s", irq_desc[i].name); 197 seq_printf(p, " %s", action->name); 198 199 for (action=action->next; action; action = action->next) 200 seq_printf(p, ", %s", action->name); 201 seq_putc(p, '\n'); 202unlock: 203 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); 204 } 205 return 0; 206} 207#endif 208