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   1 /*
   2  *  icu.c, Interrupt Control Unit routines for the NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2001-2002  MontaVista Software Inc.
   5  *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
   6  *  Copyright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 /*
  23  * Changes:
  24  *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
  25  *  - New creation, NEC VR4122 and VR4131 are supported.
  26  *  - Added support for NEC VR4111 and VR4121.
  27  *
  28  *  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
  29  *  - Coped with INTASSIGN of NEC VR4133.
  30  */
  31 #include <linux/errno.h>
  32 #include <linux/init.h>
  33 #include <linux/ioport.h>
  34 #include <linux/irq.h>
  35 #include <linux/module.h>
  36 #include <linux/smp.h>
  37 #include <linux/types.h>
  38
  39 #include <asm/cpu.h>
  40 #include <asm/io.h>
  41 #include <asm/vr41xx/irq.h>
  42 #include <asm/vr41xx/vr41xx.h>
  43
  44 static void __iomem *icu1_base;
  45 static void __iomem *icu2_base;
  46
  47 static unsigned char sysint1_assign[16] = {
  48         0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  49 static unsigned char sysint2_assign[16] = {
  50         2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  51
  52 #define ICU1_TYPE1_BASE 0x0b000080UL
  53 #define ICU2_TYPE1_BASE 0x0b000200UL
  54
  55 #define ICU1_TYPE2_BASE 0x0f000080UL
  56 #define ICU2_TYPE2_BASE 0x0f0000a0UL
  57
  58 #define ICU1_SIZE       0x20
  59 #define ICU2_SIZE       0x1c
  60
  61 #define SYSINT1REG      0x00
  62 #define PIUINTREG       0x02
  63 #define INTASSIGN0      0x04
  64 #define INTASSIGN1      0x06
  65 #define GIUINTLREG      0x08
  66 #define DSIUINTREG      0x0a
  67 #define MSYSINT1REG     0x0c
  68 #define MPIUINTREG      0x0e
  69 #define MAIUINTREG      0x10
  70 #define MKIUINTREG      0x12
  71 #define MGIUINTLREG     0x14
  72 #define MDSIUINTREG     0x16
  73 #define NMIREG          0x18
  74 #define SOFTREG         0x1a
  75 #define INTASSIGN2      0x1c
  76 #define INTASSIGN3      0x1e
  77
  78 #define SYSINT2REG      0x00
  79 #define GIUINTHREG      0x02
  80 #define FIRINTREG       0x04
  81 #define MSYSINT2REG     0x06
  82 #define MGIUINTHREG     0x08
  83 #define MFIRINTREG      0x0a
  84 #define PCIINTREG       0x0c
  85  #define PCIINT0        0x0001
  86 #define SCUINTREG       0x0e
  87  #define SCUINT0        0x0001
  88 #define CSIINTREG       0x10
  89 #define MPCIINTREG      0x12
  90 #define MSCUINTREG      0x14
  91 #define MCSIINTREG      0x16
  92 #define BCUINTREG       0x18
  93  #define BCUINTR        0x0001
  94 #define MBCUINTREG      0x1a
  95
  96 #define SYSINT1_IRQ_TO_PIN(x)   ((x) - SYSINT1_IRQ_BASE)        /* Pin 0-15 */
  97 #define SYSINT2_IRQ_TO_PIN(x)   ((x) - SYSINT2_IRQ_BASE)        /* Pin 0-15 */
  98
  99 #define INT_TO_IRQ(x)           ((x) + 2)       /* Int0-4 -> IRQ2-6 */
 100
 101 #define icu1_read(offset)               readw(icu1_base + (offset))
 102 #define icu1_write(offset, value)       writew((value), icu1_base + (offset))
 103
 104 #define icu2_read(offset)               readw(icu2_base + (offset))
 105 #define icu2_write(offset, value)       writew((value), icu2_base + (offset))
 106
 107 #define INTASSIGN_MAX   4
 108 #define INTASSIGN_MASK  0x0007
 109
 110 static inline uint16_t icu1_set(uint8_t offset, uint16_t set)
 111 {
 112         uint16_t data;
 113
 114         data = icu1_read(offset);
 115         data |= set;
 116         icu1_write(offset, data);
 117
 118         return data;
 119 }
 120
 121 static inline uint16_t icu1_clear(uint8_t offset, uint16_t clear)
 122 {
 123         uint16_t data;
 124
 125         data = icu1_read(offset);
 126         data &= ~clear;
 127         icu1_write(offset, data);
 128
 129         return data;
 130 }
 131
 132 static inline uint16_t icu2_set(uint8_t offset, uint16_t set)
 133 {
 134         uint16_t data;
 135
 136         data = icu2_read(offset);
 137         data |= set;
 138         icu2_write(offset, data);
 139
 140         return data;
 141 }
 142
 143 static inline uint16_t icu2_clear(uint8_t offset, uint16_t clear)
 144 {
 145         uint16_t data;
 146
 147         data = icu2_read(offset);
 148         data &= ~clear;
 149         icu2_write(offset, data);
 150
 151         return data;
 152 }
 153
 154 void vr41xx_enable_piuint(uint16_t mask)
 155 {
 156         struct irq_desc *desc = irq_desc + PIU_IRQ;
 157         unsigned long flags;
 158
 159         if (current_cpu_data.cputype == CPU_VR4111 ||
 160             current_cpu_data.cputype == CPU_VR4121) {
 161                 spin_lock_irqsave(&desc->lock, flags);
 162                 icu1_set(MPIUINTREG, mask);
 163                 spin_unlock_irqrestore(&desc->lock, flags);
 164         }
 165 }
 166
 167 EXPORT_SYMBOL(vr41xx_enable_piuint);
 168
 169 void vr41xx_disable_piuint(uint16_t mask)
 170 {
 171         struct irq_desc *desc = irq_desc + PIU_IRQ;
 172         unsigned long flags;
 173
 174         if (current_cpu_data.cputype == CPU_VR4111 ||
 175             current_cpu_data.cputype == CPU_VR4121) {
 176                 spin_lock_irqsave(&desc->lock, flags);
 177                 icu1_clear(MPIUINTREG, mask);
 178                 spin_unlock_irqrestore(&desc->lock, flags);
 179         }
 180 }
 181
 182 EXPORT_SYMBOL(vr41xx_disable_piuint);
 183
 184 void vr41xx_enable_aiuint(uint16_t mask)
 185 {
 186         struct irq_desc *desc = irq_desc + AIU_IRQ;
 187         unsigned long flags;
 188
 189         if (current_cpu_data.cputype == CPU_VR4111 ||
 190             current_cpu_data.cputype == CPU_VR4121) {
 191                 spin_lock_irqsave(&desc->lock, flags);
 192                 icu1_set(MAIUINTREG, mask);
 193                 spin_unlock_irqrestore(&desc->lock, flags);
 194         }
 195 }
 196
 197 EXPORT_SYMBOL(vr41xx_enable_aiuint);
 198
 199 void vr41xx_disable_aiuint(uint16_t mask)
 200 {
 201         struct irq_desc *desc = irq_desc + AIU_IRQ;
 202         unsigned long flags;
 203
 204         if (current_cpu_data.cputype == CPU_VR4111 ||
 205             current_cpu_data.cputype == CPU_VR4121) {
 206                 spin_lock_irqsave(&desc->lock, flags);
 207                 icu1_clear(MAIUINTREG, mask);
 208                 spin_unlock_irqrestore(&desc->lock, flags);
 209         }
 210 }
 211
 212 EXPORT_SYMBOL(vr41xx_disable_aiuint);
 213
 214 void vr41xx_enable_kiuint(uint16_t mask)
 215 {
 216         struct irq_desc *desc = irq_desc + KIU_IRQ;
 217         unsigned long flags;
 218
 219         if (current_cpu_data.cputype == CPU_VR4111 ||
 220             current_cpu_data.cputype == CPU_VR4121) {
 221                 spin_lock_irqsave(&desc->lock, flags);
 222                 icu1_set(MKIUINTREG, mask);
 223                 spin_unlock_irqrestore(&desc->lock, flags);
 224         }
 225 }
 226
 227 EXPORT_SYMBOL(vr41xx_enable_kiuint);
 228
 229 void vr41xx_disable_kiuint(uint16_t mask)
 230 {
 231         struct irq_desc *desc = irq_desc + KIU_IRQ;
 232         unsigned long flags;
 233
 234         if (current_cpu_data.cputype == CPU_VR4111 ||
 235             current_cpu_data.cputype == CPU_VR4121) {
 236                 spin_lock_irqsave(&desc->lock, flags);
 237                 icu1_clear(MKIUINTREG, mask);
 238                 spin_unlock_irqrestore(&desc->lock, flags);
 239         }
 240 }
 241
 242 EXPORT_SYMBOL(vr41xx_disable_kiuint);
 243
 244 void vr41xx_enable_dsiuint(uint16_t mask)
 245 {
 246         struct irq_desc *desc = irq_desc + DSIU_IRQ;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&desc->lock, flags);
 250         icu1_set(MDSIUINTREG, mask);
 251         spin_unlock_irqrestore(&desc->lock, flags);
 252 }
 253
 254 EXPORT_SYMBOL(vr41xx_enable_dsiuint);
 255
 256 void vr41xx_disable_dsiuint(uint16_t mask)
 257 {
 258         struct irq_desc *desc = irq_desc + DSIU_IRQ;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&desc->lock, flags);
 262         icu1_clear(MDSIUINTREG, mask);
 263         spin_unlock_irqrestore(&desc->lock, flags);
 264 }
 265
 266 EXPORT_SYMBOL(vr41xx_disable_dsiuint);
 267
 268 void vr41xx_enable_firint(uint16_t mask)
 269 {
 270         struct irq_desc *desc = irq_desc + FIR_IRQ;
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&desc->lock, flags);
 274         icu2_set(MFIRINTREG, mask);
 275         spin_unlock_irqrestore(&desc->lock, flags);
 276 }
 277
 278 EXPORT_SYMBOL(vr41xx_enable_firint);
 279
 280 void vr41xx_disable_firint(uint16_t mask)
 281 {
 282         struct irq_desc *desc = irq_desc + FIR_IRQ;
 283         unsigned long flags;
 284
 285         spin_lock_irqsave(&desc->lock, flags);
 286         icu2_clear(MFIRINTREG, mask);
 287         spin_unlock_irqrestore(&desc->lock, flags);
 288 }
 289
 290 EXPORT_SYMBOL(vr41xx_disable_firint);
 291
 292 void vr41xx_enable_pciint(void)
 293 {
 294         struct irq_desc *desc = irq_desc + PCI_IRQ;
 295         unsigned long flags;
 296
 297         if (current_cpu_data.cputype == CPU_VR4122 ||
 298             current_cpu_data.cputype == CPU_VR4131 ||
 299             current_cpu_data.cputype == CPU_VR4133) {
 300                 spin_lock_irqsave(&desc->lock, flags);
 301                 icu2_write(MPCIINTREG, PCIINT0);
 302                 spin_unlock_irqrestore(&desc->lock, flags);
 303         }
 304 }
 305
 306 EXPORT_SYMBOL(vr41xx_enable_pciint);
 307
 308 void vr41xx_disable_pciint(void)
 309 {
 310         struct irq_desc *desc = irq_desc + PCI_IRQ;
 311         unsigned long flags;
 312
 313         if (current_cpu_data.cputype == CPU_VR4122 ||
 314             current_cpu_data.cputype == CPU_VR4131 ||
 315             current_cpu_data.cputype == CPU_VR4133) {
 316                 spin_lock_irqsave(&desc->lock, flags);
 317                 icu2_write(MPCIINTREG, 0);
 318                 spin_unlock_irqrestore(&desc->lock, flags);
 319         }
 320 }
 321
 322 EXPORT_SYMBOL(vr41xx_disable_pciint);
 323
 324 void vr41xx_enable_scuint(void)
 325 {
 326         struct irq_desc *desc = irq_desc + SCU_IRQ;
 327         unsigned long flags;
 328
 329         if (current_cpu_data.cputype == CPU_VR4122 ||
 330             current_cpu_data.cputype == CPU_VR4131 ||
 331             current_cpu_data.cputype == CPU_VR4133) {
 332                 spin_lock_irqsave(&desc->lock, flags);
 333                 icu2_write(MSCUINTREG, SCUINT0);
 334                 spin_unlock_irqrestore(&desc->lock, flags);
 335         }
 336 }
 337
 338 EXPORT_SYMBOL(vr41xx_enable_scuint);
 339
 340 void vr41xx_disable_scuint(void)
 341 {
 342         struct irq_desc *desc = irq_desc + SCU_IRQ;
 343         unsigned long flags;
 344
 345         if (current_cpu_data.cputype == CPU_VR4122 ||
 346             current_cpu_data.cputype == CPU_VR4131 ||
 347             current_cpu_data.cputype == CPU_VR4133) {
 348                 spin_lock_irqsave(&desc->lock, flags);
 349                 icu2_write(MSCUINTREG, 0);
 350                 spin_unlock_irqrestore(&desc->lock, flags);
 351         }
 352 }
 353
 354 EXPORT_SYMBOL(vr41xx_disable_scuint);
 355
 356 void vr41xx_enable_csiint(uint16_t mask)
 357 {
 358         struct irq_desc *desc = irq_desc + CSI_IRQ;
 359         unsigned long flags;
 360
 361         if (current_cpu_data.cputype == CPU_VR4122 ||
 362             current_cpu_data.cputype == CPU_VR4131 ||
 363             current_cpu_data.cputype == CPU_VR4133) {
 364                 spin_lock_irqsave(&desc->lock, flags);
 365                 icu2_set(MCSIINTREG, mask);
 366                 spin_unlock_irqrestore(&desc->lock, flags);
 367         }
 368 }
 369
 370 EXPORT_SYMBOL(vr41xx_enable_csiint);
 371
 372 void vr41xx_disable_csiint(uint16_t mask)
 373 {
 374         struct irq_desc *desc = irq_desc + CSI_IRQ;
 375         unsigned long flags;
 376
 377         if (current_cpu_data.cputype == CPU_VR4122 ||
 378             current_cpu_data.cputype == CPU_VR4131 ||
 379             current_cpu_data.cputype == CPU_VR4133) {
 380                 spin_lock_irqsave(&desc->lock, flags);
 381                 icu2_clear(MCSIINTREG, mask);
 382                 spin_unlock_irqrestore(&desc->lock, flags);
 383         }
 384 }
 385
 386 EXPORT_SYMBOL(vr41xx_disable_csiint);
 387
 388 void vr41xx_enable_bcuint(void)
 389 {
 390         struct irq_desc *desc = irq_desc + BCU_IRQ;
 391         unsigned long flags;
 392
 393         if (current_cpu_data.cputype == CPU_VR4122 ||
 394             current_cpu_data.cputype == CPU_VR4131 ||
 395             current_cpu_data.cputype == CPU_VR4133) {
 396                 spin_lock_irqsave(&desc->lock, flags);
 397                 icu2_write(MBCUINTREG, BCUINTR);
 398                 spin_unlock_irqrestore(&desc->lock, flags);
 399         }
 400 }
 401
 402 EXPORT_SYMBOL(vr41xx_enable_bcuint);
 403
 404 void vr41xx_disable_bcuint(void)
 405 {
 406         struct irq_desc *desc = irq_desc + BCU_IRQ;
 407         unsigned long flags;
 408
 409         if (current_cpu_data.cputype == CPU_VR4122 ||
 410             current_cpu_data.cputype == CPU_VR4131 ||
 411             current_cpu_data.cputype == CPU_VR4133) {
 412                 spin_lock_irqsave(&desc->lock, flags);
 413                 icu2_write(MBCUINTREG, 0);
 414                 spin_unlock_irqrestore(&desc->lock, flags);
 415         }
 416 }
 417
 418 EXPORT_SYMBOL(vr41xx_disable_bcuint);
 419
 420 static void disable_sysint1_irq(unsigned int irq)
 421 {
 422         icu1_clear(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
 423 }
 424
 425 static void enable_sysint1_irq(unsigned int irq)
 426 {
 427         icu1_set(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
 428 }
 429
 430 static void end_sysint1_irq(unsigned int irq)
 431 {
 432         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 433                 icu1_set(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
 434 }
 435
 436 static struct irq_chip sysint1_irq_type = {
 437         .typename       = "SYSINT1",
 438         .ack            = disable_sysint1_irq,
 439         .mask           = disable_sysint1_irq,
 440         .mask_ack       = disable_sysint1_irq,
 441         .unmask         = enable_sysint1_irq,
 442         .end            = end_sysint1_irq,
 443 };
 444
 445 static void disable_sysint2_irq(unsigned int irq)
 446 {
 447         icu2_clear(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
 448 }
 449
 450 static void enable_sysint2_irq(unsigned int irq)
 451 {
 452         icu2_set(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
 453 }
 454
 455 static void end_sysint2_irq(unsigned int irq)
 456 {
 457         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 458                 icu2_set(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
 459 }
 460
 461 static struct irq_chip sysint2_irq_type = {
 462         .typename       = "SYSINT2",
 463         .ack            = disable_sysint2_irq,
 464         .mask           = disable_sysint2_irq,
 465         .mask_ack       = disable_sysint2_irq,
 466         .unmask         = enable_sysint2_irq,
 467         .end            = end_sysint2_irq,
 468 };
 469
 470 static inline int set_sysint1_assign(unsigned int irq, unsigned char assign)
 471 {
 472         struct irq_desc *desc = irq_desc + irq;
 473         uint16_t intassign0, intassign1;
 474         unsigned int pin;
 475
 476         pin = SYSINT1_IRQ_TO_PIN(irq);
 477
 478         spin_lock_irq(&desc->lock);
 479
 480         intassign0 = icu1_read(INTASSIGN0);
 481         intassign1 = icu1_read(INTASSIGN1);
 482
 483         switch (pin) {
 484         case 0:
 485                 intassign0 &= ~INTASSIGN_MASK;
 486                 intassign0 |= (uint16_t)assign;
 487                 break;
 488         case 1:
 489                 intassign0 &= ~(INTASSIGN_MASK << 3);
 490                 intassign0 |= (uint16_t)assign << 3;
 491                 break;
 492         case 2:
 493                 intassign0 &= ~(INTASSIGN_MASK << 6);
 494                 intassign0 |= (uint16_t)assign << 6;
 495                 break;
 496         case 3:
 497                 intassign0 &= ~(INTASSIGN_MASK << 9);
 498                 intassign0 |= (uint16_t)assign << 9;
 499                 break;
 500         case 8:
 501                 intassign0 &= ~(INTASSIGN_MASK << 12);
 502                 intassign0 |= (uint16_t)assign << 12;
 503                 break;
 504         case 9:
 505                 intassign1 &= ~INTASSIGN_MASK;
 506                 intassign1 |= (uint16_t)assign;
 507                 break;
 508         case 11:
 509                 intassign1 &= ~(INTASSIGN_MASK << 6);
 510                 intassign1 |= (uint16_t)assign << 6;
 511                 break;
 512         case 12:
 513                 intassign1 &= ~(INTASSIGN_MASK << 9);
 514                 intassign1 |= (uint16_t)assign << 9;
 515                 break;
 516         default:
 517                 return -EINVAL;
 518         }
 519
 520         sysint1_assign[pin] = assign;
 521         icu1_write(INTASSIGN0, intassign0);
 522         icu1_write(INTASSIGN1, intassign1);
 523
 524         spin_unlock_irq(&desc->lock);
 525
 526         return 0;
 527 }
 528
 529 static inline int set_sysint2_assign(unsigned int irq, unsigned char assign)
 530 {
 531         struct irq_desc *desc = irq_desc + irq;
 532         uint16_t intassign2, intassign3;
 533         unsigned int pin;
 534
 535         pin = SYSINT2_IRQ_TO_PIN(irq);
 536
 537         spin_lock_irq(&desc->lock);
 538
 539         intassign2 = icu1_read(INTASSIGN2);
 540         intassign3 = icu1_read(INTASSIGN3);
 541
 542         switch (pin) {
 543         case 0:
 544                 intassign2 &= ~INTASSIGN_MASK;
 545                 intassign2 |= (uint16_t)assign;
 546                 break;
 547         case 1:
 548                 intassign2 &= ~(INTASSIGN_MASK << 3);
 549                 intassign2 |= (uint16_t)assign << 3;
 550                 break;
 551         case 3:
 552                 intassign2 &= ~(INTASSIGN_MASK << 6);
 553                 intassign2 |= (uint16_t)assign << 6;
 554                 break;
 555         case 4:
 556                 intassign2 &= ~(INTASSIGN_MASK << 9);
 557                 intassign2 |= (uint16_t)assign << 9;
 558                 break;
 559         case 5:
 560                 intassign2 &= ~(INTASSIGN_MASK << 12);
 561                 intassign2 |= (uint16_t)assign << 12;
 562                 break;
 563         case 6:
 564                 intassign3 &= ~INTASSIGN_MASK;
 565                 intassign3 |= (uint16_t)assign;
 566                 break;
 567         case 7:
 568                 intassign3 &= ~(INTASSIGN_MASK << 3);
 569                 intassign3 |= (uint16_t)assign << 3;
 570                 break;
 571         case 8:
 572                 intassign3 &= ~(INTASSIGN_MASK << 6);
 573                 intassign3 |= (uint16_t)assign << 6;
 574                 break;
 575         case 9:
 576                 intassign3 &= ~(INTASSIGN_MASK << 9);
 577                 intassign3 |= (uint16_t)assign << 9;
 578                 break;
 579         case 10:
 580                 intassign3 &= ~(INTASSIGN_MASK << 12);
 581                 intassign3 |= (uint16_t)assign << 12;
 582                 break;
 583         default:
 584                 return -EINVAL;
 585         }
 586
 587         sysint2_assign[pin] = assign;
 588         icu1_write(INTASSIGN2, intassign2);
 589         icu1_write(INTASSIGN3, intassign3);
 590
 591         spin_unlock_irq(&desc->lock);
 592
 593         return 0;
 594 }
 595
 596 int vr41xx_set_intassign(unsigned int irq, unsigned char intassign)
 597 {
 598         int retval = -EINVAL;
 599
 600         if (current_cpu_data.cputype != CPU_VR4133)
 601                 return -EINVAL;
 602
 603         if (intassign > INTASSIGN_MAX)
 604                 return -EINVAL;
 605
 606         if (irq >= SYSINT1_IRQ_BASE && irq <= SYSINT1_IRQ_LAST)
 607                 retval = set_sysint1_assign(irq, intassign);
 608         else if (irq >= SYSINT2_IRQ_BASE && irq <= SYSINT2_IRQ_LAST)
 609                 retval = set_sysint2_assign(irq, intassign);
 610
 611         return retval;
 612 }
 613
 614 EXPORT_SYMBOL(vr41xx_set_intassign);
 615
 616 static int icu_get_irq(unsigned int irq)
 617 {
 618         uint16_t pend1, pend2;
 619         uint16_t mask1, mask2;
 620         int i;
 621
 622         pend1 = icu1_read(SYSINT1REG);
 623         mask1 = icu1_read(MSYSINT1REG);
 624
 625         pend2 = icu2_read(SYSINT2REG);
 626         mask2 = icu2_read(MSYSINT2REG);
 627
 628         mask1 &= pend1;
 629         mask2 &= pend2;
 630
 631         if (mask1) {
 632                 for (i = 0; i < 16; i++) {
 633                         if (irq == INT_TO_IRQ(sysint1_assign[i]) && (mask1 & (1 << i)))
 634                                 return SYSINT1_IRQ(i);
 635                 }
 636         }
 637
 638         if (mask2) {
 639                 for (i = 0; i < 16; i++) {
 640                         if (irq == INT_TO_IRQ(sysint2_assign[i]) && (mask2 & (1 << i)))
 641                                 return SYSINT2_IRQ(i);
 642                 }
 643         }
 644
 645         printk(KERN_ERR "spurious ICU interrupt: %04x,%04x\n", pend1, pend2);
 646
 647         atomic_inc(&irq_err_count);
 648
 649         return -1;
 650 }
 651
 652 static int __init vr41xx_icu_init(void)
 653 {
 654         unsigned long icu1_start, icu2_start;
 655         int i;
 656
 657         switch (current_cpu_data.cputype) {
 658         case CPU_VR4111:
 659         case CPU_VR4121:
 660                 icu1_start = ICU1_TYPE1_BASE;
 661                 icu2_start = ICU2_TYPE1_BASE;
 662                 break;
 663         case CPU_VR4122:
 664         case CPU_VR4131:
 665         case CPU_VR4133:
 666                 icu1_start = ICU1_TYPE2_BASE;
 667                 icu2_start = ICU2_TYPE2_BASE;
 668                 break;
 669         default:
 670                 printk(KERN_ERR "ICU: Unexpected CPU of NEC VR4100 series\n");
 671                 return -ENODEV;
 672         }
 673
 674         if (request_mem_region(icu1_start, ICU1_SIZE, "ICU") == NULL)
 675                 return -EBUSY;
 676
 677         if (request_mem_region(icu2_start, ICU2_SIZE, "ICU") == NULL) {
 678                 release_mem_region(icu1_start, ICU1_SIZE);
 679                 return -EBUSY;
 680         }
 681
 682         icu1_base = ioremap(icu1_start, ICU1_SIZE);
 683         if (icu1_base == NULL) {
 684                 release_mem_region(icu1_start, ICU1_SIZE);
 685                 release_mem_region(icu2_start, ICU2_SIZE);
 686                 return -ENOMEM;
 687         }
 688
 689         icu2_base = ioremap(icu2_start, ICU2_SIZE);
 690         if (icu2_base == NULL) {
 691                 iounmap(icu1_base);
 692                 release_mem_region(icu1_start, ICU1_SIZE);
 693                 release_mem_region(icu2_start, ICU2_SIZE);
 694                 return -ENOMEM;
 695         }
 696
 697         icu1_write(MSYSINT1REG, 0);
 698         icu1_write(MGIUINTLREG, 0xffff);
 699
 700         icu2_write(MSYSINT2REG, 0);
 701         icu2_write(MGIUINTHREG, 0xffff);
 702
 703         for (i = SYSINT1_IRQ_BASE; i <= SYSINT1_IRQ_LAST; i++)
 704                 set_irq_chip_and_handler(i, &sysint1_irq_type,
 705                                          handle_level_irq);
 706
 707         for (i = SYSINT2_IRQ_BASE; i <= SYSINT2_IRQ_LAST; i++)
 708                 set_irq_chip_and_handler(i, &sysint2_irq_type,
 709                                          handle_level_irq);
 710
 711         cascade_irq(INT0_IRQ, icu_get_irq);
 712         cascade_irq(INT1_IRQ, icu_get_irq);
 713         cascade_irq(INT2_IRQ, icu_get_irq);
 714         cascade_irq(INT3_IRQ, icu_get_irq);
 715         cascade_irq(INT4_IRQ, icu_get_irq);
 716
 717         return 0;
 718 }
 719
 720 core_initcall(vr41xx_icu_init);