arch/h8300/platform/h8s/ints.c

   1 /*
   2  * linux/arch/h8300/platform/h8s/ints.c
   3  *
   4  * Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  * Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  *
  12  * Copyright 1996 Roman Zippel
  13  * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel_stat.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/random.h>
  26 #include <linux/hardirq.h>
  27
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 #include <asm/traps.h>
  31 #include <asm/io.h>
  32 #include <asm/setup.h>
  33 #include <asm/gpio.h>
  34 #include <asm/regs267x.h>
  35 #include <asm/errno.h>
  36
  37 /*
  38  * This structure has only 4 elements for speed reasons
  39  */
  40 typedef struct irq_handler {
  41         irqreturn_t (*handler)(int, void *, struct pt_regs *);
  42         int         flags;
  43         int         count;
  44         void        *dev_id;
  45         const char  *devname;
  46 } irq_handler_t;
  47
  48 static irq_handler_t *irq_list[NR_IRQS];
  49
  50 /* IRQ pin assignment */
  51 struct irq_pins {
  52         unsigned char port_no;
  53         unsigned char bit_no;
  54 };
  55 /* ISTR = 0 */
  56 static const struct irq_pins irq_assign_table0[16]={
  57         {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
  58         {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
  59         {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
  60         {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
  61         {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
  62         {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
  63         {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
  64         {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
  65 };
  66 /* ISTR = 1 */
  67 static const struct irq_pins irq_assign_table1[16]={
  68         {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
  69         {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
  70         {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
  71         {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
  72         {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
  73         {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
  74         {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
  75         {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
  76 };
  77
  78 static short use_kmalloc = 0;
  79
  80 extern unsigned long *interrupt_redirect_table;
  81
  82 #define CPU_VECTOR ((unsigned long *)0x000000)
  83 #define ADDR_MASK (0xffffff)
  84
  85 static inline unsigned long *get_vector_address(void)
  86 {
  87         volatile 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_IRQ15; 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 = ~(*(unsigned long *)base);
 104         (*(unsigned long *)base) = tmp;
 105         if ((*(unsigned long *)base) != tmp)
 106                 return NULL;
 107         return (unsigned long *)base;
 108 }
 109
 110 void __init init_IRQ(void)
 111 {
 112 #if defined(CONFIG_RAMKERNEL)
 113         int i;
 114         unsigned long *ramvec,*ramvec_p;
 115         unsigned long break_vec;
 116
 117         ramvec = get_vector_address();
 118         if (ramvec == NULL)
 119                 panic("interrupt vector serup failed.");
 120         else
 121                 printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec);
 122
 123 #if defined(CONFIG_GDB_DEBUG)
 124         /* save original break vector */
 125         break_vec = ramvec[TRAP3_VEC];
 126 #else
 127         break_vec = VECTOR(trace_break);
 128 #endif
 129
 130         /* create redirect table */
 131         for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++)
 132                 *ramvec_p++ = REDIRECT(interrupt_entry);
 133
 134         /* set special vector */
 135         ramvec[TRAP0_VEC] = VECTOR(system_call);
 136         ramvec[TRAP3_VEC] = break_vec;
 137         interrupt_redirect_table = ramvec;
 138 #ifdef DUMP_VECTOR
 139         ramvec_p = ramvec;
 140         for (i = 0; i < NR_IRQS; i++) {
 141                 if ((i % 8) == 0)
 142                         printk("\n%p: ",ramvec_p);
 143                 printk("%p ",*ramvec_p);
 144                 ramvec_p++;
 145         }
 146         printk("\n");
 147 #endif
 148 #endif
 149 }
 150
 151 int request_irq(unsigned int irq,
 152                 irqreturn_t (*handler)(int, void *, struct pt_regs *),
 153                 unsigned long flags, const char *devname, void *dev_id)
 154 {
 155         unsigned short ptn = 1 << (irq - EXT_IRQ0);
 156         irq_handler_t *irq_handle;
 157         if (irq < 0 || irq >= NR_IRQS) {
 158                 printk("Incorrect IRQ %d from %s\n", irq, devname);
 159                 return -EINVAL;
 160         }
 161         if (irq_list[irq])
 162                 return -EBUSY; /* already used */
 163         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
 164                 /* initialize IRQ pin */
 165                 unsigned int port_no,bit_no;
 166                 if (*(volatile unsigned short *)ITSR & ptn) {
 167                         port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
 168                         bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
 169                 } else {
 170                         port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
 171                         bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
 172                 }
 173                 if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
 174                         return -EBUSY;                   /* pin already use */
 175                 H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
 176                 *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
 177         }
 178
 179         if (use_kmalloc)
 180                 irq_handle = kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
 181         else {
 182                 /* use bootmem allocator */
 183                 irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
 184                 irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
 185         }
 186
 187         if (irq_handle == NULL)
 188                 return -ENOMEM;
 189
 190         irq_handle->handler = handler;
 191         irq_handle->flags   = flags;
 192         irq_handle->count   = 0;
 193         irq_handle->dev_id  = dev_id;
 194         irq_handle->devname = devname;
 195         irq_list[irq] = irq_handle;
 196         if (irq_handle->flags & IRQF_SAMPLE_RANDOM)
 197                 rand_initialize_irq(irq);
 198
 199         /* enable interrupt */
 200         /* compatible i386  */
 201         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
 202                 *(volatile unsigned short *)IER |= ptn;
 203         return 0;
 204 }
 205
 206 EXPORT_SYMBOL(request_irq);
 207
 208 void free_irq(unsigned int irq, void *dev_id)
 209 {
 210         if (irq >= NR_IRQS)
 211                 return;
 212         if (irq_list[irq]->dev_id != dev_id)
 213                 printk("%s: Removing probably wrong IRQ %d from %s\n",
 214                        __FUNCTION__, irq, irq_list[irq]->devname);
 215         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
 216                 /* disable interrupt & release IRQ pin */
 217                 unsigned short port_no,bit_no;
 218                 *(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0));
 219                 *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
 220                 if (*(volatile unsigned short *)ITSR & (1 << (irq - EXT_IRQ0))) {
 221                         port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
 222                         bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
 223                 } else {
 224                         port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
 225                         bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
 226                 }
 227                 H8300_GPIO_FREE(port_no, bit_no);
 228         }
 229         if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
 230                 kfree(irq_list[irq]);
 231                 irq_list[irq] = NULL;
 232         }
 233 }
 234
 235 EXPORT_SYMBOL(free_irq);
 236
 237 unsigned long probe_irq_on (void)
 238 {
 239         return 0;
 240 }
 241
 242 EXPORT_SYMBOL(probe_irq_on);
 243
 244 int probe_irq_off (unsigned long irqs)
 245 {
 246         return 0;
 247 }
 248
 249 EXPORT_SYMBOL(probe_irq_off);
 250
 251 void enable_irq(unsigned int irq)
 252 {
 253         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
 254                 *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
 255 }
 256
 257 void disable_irq(unsigned int irq)
 258 {
 259         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
 260                 *(volatile unsigned short *)IER &= ~(1 << (irq - EXT_IRQ0));
 261 }
 262
 263 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
 264 {
 265         irq_enter();
 266         /* ISR clear       */
 267         /* compatible i386 */
 268         if (vec >= EXT_IRQ0 && vec <= EXT_IRQ15)
 269                 *(volatile unsigned short *)ISR &= ~(1 << (vec - EXT_IRQ0));
 270         if (vec < NR_IRQS) {
 271                 if (irq_list[vec]) {
 272                         irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp);
 273                         irq_list[vec]->count++;
 274                         if (irq_list[vec]->flags & IRQF_SAMPLE_RANDOM)
 275                                 add_interrupt_randomness(vec);
 276                 }
 277         } else {
 278                 BUG();
 279         }
 280         irq_exit();
 281 }
 282
 283 int show_interrupts(struct seq_file *p, void *v)
 284 {
 285         int i = *(loff_t *) v;
 286
 287         if ((i < NR_IRQS) && (irq_list[i] !=NULL)) {
 288                 seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
 289                 seq_printf(p, "%s\n", irq_list[i]->devname);
 290         }
 291
 292         return 0;
 293 }
 294
 295 void init_irq_proc(void)
 296 {
 297 }
 298
 299 static int __init enable_kmalloc(void)
 300 {
 301         use_kmalloc = 1;
 302         return 0;
 303 }
 304 core_initcall(enable_kmalloc);