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   1 /*
   2  * linux/arch/mips/tx4938/common/irq.c
   3  *
   4  * Common tx4938 irq handler
   5  * Copyright (C) 2000-2001 Toshiba Corporation
   6  *
   7  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   8  * terms of the GNU General Public License version 2. This program is
   9  * licensed "as is" without any warranty of any kind, whether express
  10  * or implied.
  11  *
  12  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  13  */
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/module.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>
  20 #include <linux/types.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/ioport.h>
  23 #include <linux/timex.h>
  24 #include <linux/slab.h>
  25 #include <linux/random.h>
  26 #include <linux/irq.h>
  27 #include <asm/bitops.h>
  28 #include <asm/bootinfo.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/mipsregs.h>
  32 #include <asm/system.h>
  33 #include <asm/tx4938/rbtx4938.h>
  34
  35 /**********************************************************************************/
  36 /* Forwad definitions for all pic's                                               */
  37 /**********************************************************************************/
  38
  39 static unsigned int tx4938_irq_cp0_startup(unsigned int irq);
  40 static void tx4938_irq_cp0_shutdown(unsigned int irq);
  41 static void tx4938_irq_cp0_enable(unsigned int irq);
  42 static void tx4938_irq_cp0_disable(unsigned int irq);
  43 static void tx4938_irq_cp0_mask_and_ack(unsigned int irq);
  44 static void tx4938_irq_cp0_end(unsigned int irq);
  45
  46 static unsigned int tx4938_irq_pic_startup(unsigned int irq);
  47 static void tx4938_irq_pic_shutdown(unsigned int irq);
  48 static void tx4938_irq_pic_enable(unsigned int irq);
  49 static void tx4938_irq_pic_disable(unsigned int irq);
  50 static void tx4938_irq_pic_mask_and_ack(unsigned int irq);
  51 static void tx4938_irq_pic_end(unsigned int irq);
  52
  53 /**********************************************************************************/
  54 /* Kernel structs for all pic's                                                   */
  55 /**********************************************************************************/
  56 DEFINE_SPINLOCK(tx4938_cp0_lock);
  57 DEFINE_SPINLOCK(tx4938_pic_lock);
  58
  59 #define TX4938_CP0_NAME "TX4938-CP0"
  60 static struct irq_chip tx4938_irq_cp0_type = {
  61         .typename = TX4938_CP0_NAME,
  62         .startup = tx4938_irq_cp0_startup,
  63         .shutdown = tx4938_irq_cp0_shutdown,
  64         .enable = tx4938_irq_cp0_enable,
  65         .disable = tx4938_irq_cp0_disable,
  66         .ack = tx4938_irq_cp0_mask_and_ack,
  67         .end = tx4938_irq_cp0_end,
  68         .set_affinity = NULL
  69 };
  70
  71 #define TX4938_PIC_NAME "TX4938-PIC"
  72 static struct irq_chip tx4938_irq_pic_type = {
  73         .typename = TX4938_PIC_NAME,
  74         .startup = tx4938_irq_pic_startup,
  75         .shutdown = tx4938_irq_pic_shutdown,
  76         .enable = tx4938_irq_pic_enable,
  77         .disable = tx4938_irq_pic_disable,
  78         .ack = tx4938_irq_pic_mask_and_ack,
  79         .end = tx4938_irq_pic_end,
  80         .set_affinity = NULL
  81 };
  82
  83 static struct irqaction tx4938_irq_pic_action = {
  84         .handler = no_action,
  85         .flags = 0,
  86         .mask = CPU_MASK_NONE,
  87         .name = TX4938_PIC_NAME
  88 };
  89
  90 /**********************************************************************************/
  91 /* Functions for cp0                                                              */
  92 /**********************************************************************************/
  93
  94 #define tx4938_irq_cp0_mask(irq) ( 1 << ( irq-TX4938_IRQ_CP0_BEG+8 ) )
  95
  96 static void __init
  97 tx4938_irq_cp0_init(void)
  98 {
  99         int i;
 100
 101         for (i = TX4938_IRQ_CP0_BEG; i <= TX4938_IRQ_CP0_END; i++) {
 102                 irq_desc[i].status = IRQ_DISABLED;
 103                 irq_desc[i].action = 0;
 104                 irq_desc[i].depth = 1;
 105                 irq_desc[i].chip = &tx4938_irq_cp0_type;
 106         }
 107 }
 108
 109 static unsigned int
 110 tx4938_irq_cp0_startup(unsigned int irq)
 111 {
 112         tx4938_irq_cp0_enable(irq);
 113
 114         return 0;
 115 }
 116
 117 static void
 118 tx4938_irq_cp0_shutdown(unsigned int irq)
 119 {
 120         tx4938_irq_cp0_disable(irq);
 121 }
 122
 123 static void
 124 tx4938_irq_cp0_enable(unsigned int irq)
 125 {
 126         unsigned long flags;
 127
 128         spin_lock_irqsave(&tx4938_cp0_lock, flags);
 129
 130         set_c0_status(tx4938_irq_cp0_mask(irq));
 131
 132         spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
 133 }
 134
 135 static void
 136 tx4938_irq_cp0_disable(unsigned int irq)
 137 {
 138         unsigned long flags;
 139
 140         spin_lock_irqsave(&tx4938_cp0_lock, flags);
 141
 142         clear_c0_status(tx4938_irq_cp0_mask(irq));
 143
 144         spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
 145 }
 146
 147 static void
 148 tx4938_irq_cp0_mask_and_ack(unsigned int irq)
 149 {
 150         tx4938_irq_cp0_disable(irq);
 151 }
 152
 153 static void
 154 tx4938_irq_cp0_end(unsigned int irq)
 155 {
 156         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 157                 tx4938_irq_cp0_enable(irq);
 158         }
 159 }
 160
 161 /**********************************************************************************/
 162 /* Functions for pic                                                              */
 163 /**********************************************************************************/
 164
 165 u32
 166 tx4938_irq_pic_addr(int irq)
 167 {
 168         /* MVMCP -- need to formulize this */
 169         irq -= TX4938_IRQ_PIC_BEG;
 170
 171         switch (irq) {
 172         case 17:
 173         case 16:
 174         case 1:
 175         case 0:{
 176                         return (TX4938_MKA(TX4938_IRC_IRLVL0));
 177                 }
 178         case 19:
 179         case 18:
 180         case 3:
 181         case 2:{
 182                         return (TX4938_MKA(TX4938_IRC_IRLVL1));
 183                 }
 184         case 21:
 185         case 20:
 186         case 5:
 187         case 4:{
 188                         return (TX4938_MKA(TX4938_IRC_IRLVL2));
 189                 }
 190         case 23:
 191         case 22:
 192         case 7:
 193         case 6:{
 194                         return (TX4938_MKA(TX4938_IRC_IRLVL3));
 195                 }
 196         case 25:
 197         case 24:
 198         case 9:
 199         case 8:{
 200                         return (TX4938_MKA(TX4938_IRC_IRLVL4));
 201                 }
 202         case 27:
 203         case 26:
 204         case 11:
 205         case 10:{
 206                         return (TX4938_MKA(TX4938_IRC_IRLVL5));
 207                 }
 208         case 29:
 209         case 28:
 210         case 13:
 211         case 12:{
 212                         return (TX4938_MKA(TX4938_IRC_IRLVL6));
 213                 }
 214         case 31:
 215         case 30:
 216         case 15:
 217         case 14:{
 218                         return (TX4938_MKA(TX4938_IRC_IRLVL7));
 219                 }
 220         }
 221
 222         return 0;
 223 }
 224
 225 u32
 226 tx4938_irq_pic_mask(int irq)
 227 {
 228         /* MVMCP -- need to formulize this */
 229         irq -= TX4938_IRQ_PIC_BEG;
 230
 231         switch (irq) {
 232         case 31:
 233         case 29:
 234         case 27:
 235         case 25:
 236         case 23:
 237         case 21:
 238         case 19:
 239         case 17:{
 240                         return (0x07000000);
 241                 }
 242         case 30:
 243         case 28:
 244         case 26:
 245         case 24:
 246         case 22:
 247         case 20:
 248         case 18:
 249         case 16:{
 250                         return (0x00070000);
 251                 }
 252         case 15:
 253         case 13:
 254         case 11:
 255         case 9:
 256         case 7:
 257         case 5:
 258         case 3:
 259         case 1:{
 260                         return (0x00000700);
 261                 }
 262         case 14:
 263         case 12:
 264         case 10:
 265         case 8:
 266         case 6:
 267         case 4:
 268         case 2:
 269         case 0:{
 270                         return (0x00000007);
 271                 }
 272         }
 273         return 0x00000000;
 274 }
 275
 276 static void
 277 tx4938_irq_pic_modify(unsigned pic_reg, unsigned clr_bits, unsigned set_bits)
 278 {
 279         unsigned long val = 0;
 280
 281         val = TX4938_RD(pic_reg);
 282         val &= (~clr_bits);
 283         val |= (set_bits);
 284         TX4938_WR(pic_reg, val);
 285         mmiowb();
 286         TX4938_RD(pic_reg);
 287 }
 288
 289 static void __init
 290 tx4938_irq_pic_init(void)
 291 {
 292         unsigned long flags;
 293         int i;
 294
 295         for (i = TX4938_IRQ_PIC_BEG; i <= TX4938_IRQ_PIC_END; i++) {
 296                 irq_desc[i].status = IRQ_DISABLED;
 297                 irq_desc[i].action = 0;
 298                 irq_desc[i].depth = 2;
 299                 irq_desc[i].chip = &tx4938_irq_pic_type;
 300         }
 301
 302         setup_irq(TX4938_IRQ_NEST_PIC_ON_CP0, &tx4938_irq_pic_action);
 303
 304         spin_lock_irqsave(&tx4938_pic_lock, flags);
 305
 306         TX4938_WR(0xff1ff640, 0x6);     /* irq level mask -- only accept hightest */
 307         TX4938_WR(0xff1ff600, TX4938_RD(0xff1ff600) | 0x1);     /* irq enable */
 308
 309         spin_unlock_irqrestore(&tx4938_pic_lock, flags);
 310 }
 311
 312 static unsigned int
 313 tx4938_irq_pic_startup(unsigned int irq)
 314 {
 315         tx4938_irq_pic_enable(irq);
 316
 317         return 0;
 318 }
 319
 320 static void
 321 tx4938_irq_pic_shutdown(unsigned int irq)
 322 {
 323         tx4938_irq_pic_disable(irq);
 324 }
 325
 326 static void
 327 tx4938_irq_pic_enable(unsigned int irq)
 328 {
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&tx4938_pic_lock, flags);
 332
 333         tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq), 0,
 334                               tx4938_irq_pic_mask(irq));
 335
 336         spin_unlock_irqrestore(&tx4938_pic_lock, flags);
 337 }
 338
 339 static void
 340 tx4938_irq_pic_disable(unsigned int irq)
 341 {
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&tx4938_pic_lock, flags);
 345
 346         tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq),
 347                               tx4938_irq_pic_mask(irq), 0);
 348
 349         spin_unlock_irqrestore(&tx4938_pic_lock, flags);
 350 }
 351
 352 static void
 353 tx4938_irq_pic_mask_and_ack(unsigned int irq)
 354 {
 355         tx4938_irq_pic_disable(irq);
 356 }
 357
 358 static void
 359 tx4938_irq_pic_end(unsigned int irq)
 360 {
 361         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 362                 tx4938_irq_pic_enable(irq);
 363         }
 364 }
 365
 366 /**********************************************************************************/
 367 /* Main init functions                                                            */
 368 /**********************************************************************************/
 369
 370 void __init
 371 tx4938_irq_init(void)
 372 {
 373         tx4938_irq_cp0_init();
 374         tx4938_irq_pic_init();
 375 }
 376
 377 int
 378 tx4938_irq_nested(void)
 379 {
 380         int sw_irq = 0;
 381         u32 level2;
 382
 383         level2 = TX4938_RD(0xff1ff6a0);
 384         if ((level2 & 0x10000) == 0) {
 385                 level2 &= 0x1f;
 386                 sw_irq = TX4938_IRQ_PIC_BEG + level2;
 387                 if (sw_irq == 26) {
 388                         {
 389                                 extern int toshiba_rbtx4938_irq_nested(int sw_irq);
 390                                 sw_irq = toshiba_rbtx4938_irq_nested(sw_irq);
 391                         }
 392                 }
 393         }
 394
 395         wbflush();
 396         return sw_irq;
 397 }
 398
 399 asmlinkage void plat_irq_dispatch(void)
 400 {
 401         unsigned int pending = read_c0_cause() & read_c0_status();
 402
 403         if (pending & STATUSF_IP7)
 404                 do_IRQ(TX4938_IRQ_CPU_TIMER);
 405         else if (pending & STATUSF_IP2) {
 406                 int irq = tx4938_irq_nested();
 407                 if (irq)
 408                         do_IRQ(irq);
 409                 else
 410                         spurious_interrupt();
 411         } else if (pending & STATUSF_IP1)
 412                 do_IRQ(TX4938_IRQ_USER1);
 413         else if (pending & STATUSF_IP0)
 414                 do_IRQ(TX4938_IRQ_USER0);
 415 }