1 /* 2 * linux/arch/m68k/sun3/sun3ints.c -- Sun-3(x) Linux 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/config.h> 10 #include <linux/types.h> 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/kernel_stat.h> 14 #include <linux/interrupt.h> 15 #include <asm/segment.h> 16 #include <asm/intersil.h> 17 #include <asm/oplib.h> 18 #include <asm/sun3ints.h> 19 #include <linux/seq_file.h> 20 21 extern void sun3_leds (unsigned char); 22 static irqreturn_t sun3_inthandle(int irq, void *dev_id, struct pt_regs *fp); 23 24 void sun3_disable_interrupts(void) 25 { 26 sun3_disable_irq(0); 27 } 28 29 void sun3_enable_interrupts(void) 30 { 31 sun3_enable_irq(0); 32 } 33 34 int led_pattern[8] = { 35 ~(0x80), ~(0x01), 36 ~(0x40), ~(0x02), 37 ~(0x20), ~(0x04), 38 ~(0x10), ~(0x08) 39 }; 40 41 volatile unsigned char* sun3_intreg; 42 43 void sun3_insert_irq(irq_node_t **list, irq_node_t *node) 44 { 45 } 46 47 void sun3_delete_irq(irq_node_t **list, void *dev_id) 48 { 49 } 50 51 void sun3_enable_irq(unsigned int irq) 52 { 53 *sun3_intreg |= (1<<irq); 54 } 55 56 void sun3_disable_irq(unsigned int irq) 57 { 58 *sun3_intreg &= ~(1<<irq); 59 } 60 61 inline void sun3_do_irq(int irq, struct pt_regs *fp) 62 { 63 kstat_cpu(0).irqs[SYS_IRQS + irq]++; 64 *sun3_intreg &= ~(1<<irq); 65 *sun3_intreg |= (1<<irq); 66 } 67 68 static irqreturn_t sun3_int7(int irq, void *dev_id, struct pt_regs *fp) 69 { 70 sun3_do_irq(irq,fp); 71 if(!(kstat_cpu(0).irqs[SYS_IRQS + irq] % 2000)) 72 sun3_leds(led_pattern[(kstat_cpu(0).irqs[SYS_IRQS+irq]%16000) 73 /2000]); 74 return IRQ_HANDLED; 75 } 76 77 static irqreturn_t sun3_int5(int irq, void *dev_id, struct pt_regs *fp) 78 { 79 kstat_cpu(0).irqs[SYS_IRQS + irq]++; 80 #ifdef CONFIG_SUN3 81 intersil_clear(); 82 #endif 83 *sun3_intreg &= ~(1<<irq); 84 *sun3_intreg |= (1<<irq); 85 #ifdef CONFIG_SUN3 86 intersil_clear(); 87 #endif 88 do_timer(fp); 89 #ifndef CONFIG_SMP 90 update_process_times(user_mode(fp)); 91 #endif 92 if(!(kstat_cpu(0).irqs[SYS_IRQS + irq] % 20)) 93 sun3_leds(led_pattern[(kstat_cpu(0).irqs[SYS_IRQS+irq]%160) 94 /20]); 95 return IRQ_HANDLED; 96 } 97 98 /* handle requested ints, excepting 5 and 7, which always do the same 99 thing */ 100 irqreturn_t (*sun3_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = { 101 [0] = sun3_inthandle, 102 [1] = sun3_inthandle, 103 [2] = sun3_inthandle, 104 [3] = sun3_inthandle, 105 [4] = sun3_inthandle, 106 [5] = sun3_int5, 107 [6] = sun3_inthandle, 108 [7] = sun3_int7 109 }; 110 111 static const char *dev_names[SYS_IRQS] = { 112 [5] = "timer", 113 [7] = "int7 handler" 114 }; 115 static void *dev_ids[SYS_IRQS]; 116 static irqreturn_t (*sun3_inthandler[SYS_IRQS])(int, void *, struct pt_regs *) = { 117 [5] = sun3_int5, 118 [7] = sun3_int7 119 }; 120 static irqreturn_t (*sun3_vechandler[SUN3_INT_VECS])(int, void *, struct pt_regs *); 121 static void *vec_ids[SUN3_INT_VECS]; 122 static const char *vec_names[SUN3_INT_VECS]; 123 static int vec_ints[SUN3_INT_VECS]; 124 125 126 int show_sun3_interrupts(struct seq_file *p, void *v) 127 { 128 int i; 129 130 for(i = 0; i < (SUN3_INT_VECS-1); i++) { 131 if(sun3_vechandler[i] != NULL) { 132 seq_printf(p, "vec %3d: %10u %s\n", i+64, 133 vec_ints[i], 134 (vec_names[i]) ? vec_names[i] : 135 "sun3_vechandler"); 136 } 137 } 138 139 return 0; 140 } 141 142 static irqreturn_t sun3_inthandle(int irq, void *dev_id, struct pt_regs *fp) 143 { 144 if(sun3_inthandler[irq] == NULL) 145 panic ("bad interrupt %d received (id %p)\n",irq, dev_id); 146 147 kstat_cpu(0).irqs[SYS_IRQS + irq]++; 148 *sun3_intreg &= ~(1<<irq); 149 150 sun3_inthandler[irq](irq, dev_ids[irq], fp); 151 return IRQ_HANDLED; 152 } 153 154 static irqreturn_t sun3_vec255(int irq, void *dev_id, struct pt_regs *fp) 155 { 156 // intersil_clear(); 157 return IRQ_HANDLED; 158 } 159 160 void sun3_init_IRQ(void) 161 { 162 int i; 163 164 *sun3_intreg = 1; 165 166 for(i = 0; i < SYS_IRQS; i++) 167 { 168 if(dev_names[i]) 169 cpu_request_irq(i, sun3_default_handler[i], 0, 170 dev_names[i], NULL); 171 } 172 173 for(i = 0; i < 192; i++) 174 sun3_vechandler[i] = NULL; 175 176 sun3_vechandler[191] = sun3_vec255; 177 } 178 179 int sun3_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), 180 unsigned long flags, const char *devname, void *dev_id) 181 { 182 183 if(irq < SYS_IRQS) { 184 if(sun3_inthandler[irq] != NULL) { 185 printk("sun3_request_irq: request for irq %d -- already taken!\n", irq); 186 return 1; 187 } 188 189 sun3_inthandler[irq] = handler; 190 dev_ids[irq] = dev_id; 191 dev_names[irq] = devname; 192 193 /* setting devname would be nice */ 194 cpu_request_irq(irq, sun3_default_handler[irq], 0, devname, 195 NULL); 196 197 return 0; 198 } else { 199 if((irq >= 64) && (irq <= 255)) { 200 int vec; 201 202 vec = irq - 64; 203 if(sun3_vechandler[vec] != NULL) { 204 printk("sun3_request_irq: request for vec %d -- already taken!\n", irq); 205 return 1; 206 } 207 208 sun3_vechandler[vec] = handler; 209 vec_ids[vec] = dev_id; 210 vec_names[vec] = devname; 211 vec_ints[vec] = 0; 212 213 return 0; 214 } 215 } 216 217 printk("sun3_request_irq: invalid irq %d\n", irq); 218 return 1; 219 220 } 221 222 void sun3_free_irq(unsigned int irq, void *dev_id) 223 { 224 225 if(irq < SYS_IRQS) { 226 if(sun3_inthandler[irq] == NULL) 227 panic("sun3_free_int: attempt to free unused irq %d\n", irq); 228 if(dev_ids[irq] != dev_id) 229 panic("sun3_free_int: incorrect dev_id for irq %d\n", irq); 230 231 sun3_inthandler[irq] = NULL; 232 return; 233 } else if((irq >= 64) && (irq <= 255)) { 234 int vec; 235 236 vec = irq - 64; 237 if(sun3_vechandler[vec] == NULL) 238 panic("sun3_free_int: attempt to free unused vector %d\n", irq); 239 if(vec_ids[irq] != dev_id) 240 panic("sun3_free_int: incorrect dev_id for vec %d\n", irq); 241 242 sun3_vechandler[vec] = NULL; 243 return; 244 } else { 245 panic("sun3_free_irq: invalid irq %d\n", irq); 246 } 247 } 248 249 irqreturn_t sun3_process_int(int irq, struct pt_regs *regs) 250 { 251 252 if((irq >= 64) && (irq <= 255)) { 253 int vec; 254 255 vec = irq - 64; 256 if(sun3_vechandler[vec] == NULL) 257 panic ("bad interrupt vector %d received\n",irq); 258 259 vec_ints[vec]++; 260 return sun3_vechandler[vec](irq, vec_ids[vec], regs); 261 } else { 262 panic("sun3_process_int: unable to handle interrupt vector %d\n", 263 irq); 264 } 265 } 266