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   1 /* linux/arch/arm/plat-s3c24xx/irq.c
   2  *
   3  * Copyright (c) 2003,2004 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Changelog:
  21  *
  22  *   22-Jul-2004  Ben Dooks <ben@simtec.co.uk>
  23  *                Fixed compile warnings
  24  *
  25  *   22-Jul-2004  Roc Wu <cooloney@yahoo.com.cn>
  26  *                Fixed s3c_extirq_type
  27  *
  28  *   21-Jul-2004  Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
  29  *                Addition of ADC/TC demux
  30  *
  31  *   04-Oct-2004  Klaus Fetscher <k.fetscher@fetron.de>
  32  *                Fix for set_irq_type() on low EINT numbers
  33  *
  34  *   05-Oct-2004  Ben Dooks <ben@simtec.co.uk>
  35  *                Tidy up KF's patch and sort out new release
  36  *
  37  *   05-Oct-2004  Ben Dooks <ben@simtec.co.uk>
  38  *                Add support for power management controls
  39  *
  40  *   04-Nov-2004  Ben Dooks
  41  *                Fix standard IRQ wake for EINT0..4 and RTC
  42  *
  43  *   22-Feb-2005  Ben Dooks
  44  *                Fixed edge-triggering on ADC IRQ
  45  *
  46  *   28-Jun-2005  Ben Dooks
  47  *                Mark IRQ_LCD valid
  48  *
  49  *   25-Jul-2005  Ben Dooks
  50  *                Split the S3C2440 IRQ code to separate file
  51 */
  52
  53 #include <linux/init.h>
  54 #include <linux/module.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/ioport.h>
  57 #include <linux/sysdev.h>
  58
  59 #include <asm/hardware.h>
  60 #include <asm/irq.h>
  61 #include <asm/io.h>
  62
  63 #include <asm/mach/irq.h>
  64
  65 #include <asm/arch/regs-irq.h>
  66 #include <asm/arch/regs-gpio.h>
  67
  68 #include <asm/plat-s3c24xx/cpu.h>
  69 #include <asm/plat-s3c24xx/pm.h>
  70 #include <asm/plat-s3c24xx/irq.h>
  71
  72 /* wakeup irq control */
  73
  74 #ifdef CONFIG_PM
  75
  76 /* state for IRQs over sleep */
  77
  78 /* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
  79  *
  80  * set bit to 1 in allow bitfield to enable the wakeup settings on it
  81 */
  82
  83 unsigned long s3c_irqwake_intallow      = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
  84 unsigned long s3c_irqwake_intmask       = 0xffffffffL;
  85 unsigned long s3c_irqwake_eintallow     = 0x0000fff0L;
  86 unsigned long s3c_irqwake_eintmask      = 0xffffffffL;
  87
  88 int
  89 s3c_irq_wake(unsigned int irqno, unsigned int state)
  90 {
  91         unsigned long irqbit = 1 << (irqno - IRQ_EINT0);
  92
  93         if (!(s3c_irqwake_intallow & irqbit))
  94                 return -ENOENT;
  95
  96         printk(KERN_INFO "wake %s for irq %d\n",
  97                state ? "enabled" : "disabled", irqno);
  98
  99         if (!state)
 100                 s3c_irqwake_intmask |= irqbit;
 101         else
 102                 s3c_irqwake_intmask &= ~irqbit;
 103
 104         return 0;
 105 }
 106
 107 static int
 108 s3c_irqext_wake(unsigned int irqno, unsigned int state)
 109 {
 110         unsigned long bit = 1L << (irqno - EXTINT_OFF);
 111
 112         if (!(s3c_irqwake_eintallow & bit))
 113                 return -ENOENT;
 114
 115         printk(KERN_INFO "wake %s for irq %d\n",
 116                state ? "enabled" : "disabled", irqno);
 117
 118         if (!state)
 119                 s3c_irqwake_eintmask |= bit;
 120         else
 121                 s3c_irqwake_eintmask &= ~bit;
 122
 123         return 0;
 124 }
 125
 126 #else
 127 #define s3c_irqext_wake NULL
 128 #define s3c_irq_wake NULL
 129 #endif
 130
 131
 132 static void
 133 s3c_irq_mask(unsigned int irqno)
 134 {
 135         unsigned long mask;
 136
 137         irqno -= IRQ_EINT0;
 138
 139         mask = __raw_readl(S3C2410_INTMSK);
 140         mask |= 1UL << irqno;
 141         __raw_writel(mask, S3C2410_INTMSK);
 142 }
 143
 144 static inline void
 145 s3c_irq_ack(unsigned int irqno)
 146 {
 147         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
 148
 149         __raw_writel(bitval, S3C2410_SRCPND);
 150         __raw_writel(bitval, S3C2410_INTPND);
 151 }
 152
 153 static inline void
 154 s3c_irq_maskack(unsigned int irqno)
 155 {
 156         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
 157         unsigned long mask;
 158
 159         mask = __raw_readl(S3C2410_INTMSK);
 160         __raw_writel(mask|bitval, S3C2410_INTMSK);
 161
 162         __raw_writel(bitval, S3C2410_SRCPND);
 163         __raw_writel(bitval, S3C2410_INTPND);
 164 }
 165
 166
 167 static void
 168 s3c_irq_unmask(unsigned int irqno)
 169 {
 170         unsigned long mask;
 171
 172         if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
 173                 irqdbf2("s3c_irq_unmask %d\n", irqno);
 174
 175         irqno -= IRQ_EINT0;
 176
 177         mask = __raw_readl(S3C2410_INTMSK);
 178         mask &= ~(1UL << irqno);
 179         __raw_writel(mask, S3C2410_INTMSK);
 180 }
 181
 182 struct irq_chip s3c_irq_level_chip = {
 183         .name           = "s3c-level",
 184         .ack            = s3c_irq_maskack,
 185         .mask           = s3c_irq_mask,
 186         .unmask         = s3c_irq_unmask,
 187         .set_wake       = s3c_irq_wake
 188 };
 189
 190 struct irq_chip s3c_irq_chip = {
 191         .name           = "s3c",
 192         .ack            = s3c_irq_ack,
 193         .mask           = s3c_irq_mask,
 194         .unmask         = s3c_irq_unmask,
 195         .set_wake       = s3c_irq_wake
 196 };
 197
 198 static void
 199 s3c_irqext_mask(unsigned int irqno)
 200 {
 201         unsigned long mask;
 202
 203         irqno -= EXTINT_OFF;
 204
 205         mask = __raw_readl(S3C24XX_EINTMASK);
 206         mask |= ( 1UL << irqno);
 207         __raw_writel(mask, S3C24XX_EINTMASK);
 208 }
 209
 210 static void
 211 s3c_irqext_ack(unsigned int irqno)
 212 {
 213         unsigned long req;
 214         unsigned long bit;
 215         unsigned long mask;
 216
 217         bit = 1UL << (irqno - EXTINT_OFF);
 218
 219         mask = __raw_readl(S3C24XX_EINTMASK);
 220
 221         __raw_writel(bit, S3C24XX_EINTPEND);
 222
 223         req = __raw_readl(S3C24XX_EINTPEND);
 224         req &= ~mask;
 225
 226         /* not sure if we should be acking the parent irq... */
 227
 228         if (irqno <= IRQ_EINT7 ) {
 229                 if ((req & 0xf0) == 0)
 230                         s3c_irq_ack(IRQ_EINT4t7);
 231         } else {
 232                 if ((req >> 8) == 0)
 233                         s3c_irq_ack(IRQ_EINT8t23);
 234         }
 235 }
 236
 237 static void
 238 s3c_irqext_unmask(unsigned int irqno)
 239 {
 240         unsigned long mask;
 241
 242         irqno -= EXTINT_OFF;
 243
 244         mask = __raw_readl(S3C24XX_EINTMASK);
 245         mask &= ~( 1UL << irqno);
 246         __raw_writel(mask, S3C24XX_EINTMASK);
 247 }
 248
 249 int
 250 s3c_irqext_type(unsigned int irq, unsigned int type)
 251 {
 252         void __iomem *extint_reg;
 253         void __iomem *gpcon_reg;
 254         unsigned long gpcon_offset, extint_offset;
 255         unsigned long newvalue = 0, value;
 256
 257         if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
 258         {
 259                 gpcon_reg = S3C2410_GPFCON;
 260                 extint_reg = S3C24XX_EXTINT0;
 261                 gpcon_offset = (irq - IRQ_EINT0) * 2;
 262                 extint_offset = (irq - IRQ_EINT0) * 4;
 263         }
 264         else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
 265         {
 266                 gpcon_reg = S3C2410_GPFCON;
 267                 extint_reg = S3C24XX_EXTINT0;
 268                 gpcon_offset = (irq - (EXTINT_OFF)) * 2;
 269                 extint_offset = (irq - (EXTINT_OFF)) * 4;
 270         }
 271         else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
 272         {
 273                 gpcon_reg = S3C2410_GPGCON;
 274                 extint_reg = S3C24XX_EXTINT1;
 275                 gpcon_offset = (irq - IRQ_EINT8) * 2;
 276                 extint_offset = (irq - IRQ_EINT8) * 4;
 277         }
 278         else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
 279         {
 280                 gpcon_reg = S3C2410_GPGCON;
 281                 extint_reg = S3C24XX_EXTINT2;
 282                 gpcon_offset = (irq - IRQ_EINT8) * 2;
 283                 extint_offset = (irq - IRQ_EINT16) * 4;
 284         } else
 285                 return -1;
 286
 287         /* Set the GPIO to external interrupt mode */
 288         value = __raw_readl(gpcon_reg);
 289         value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
 290         __raw_writel(value, gpcon_reg);
 291
 292         /* Set the external interrupt to pointed trigger type */
 293         switch (type)
 294         {
 295                 case IRQ_TYPE_NONE:
 296                         printk(KERN_WARNING "No edge setting!\n");
 297                         break;
 298
 299                 case IRQ_TYPE_EDGE_RISING:
 300                         newvalue = S3C2410_EXTINT_RISEEDGE;
 301                         break;
 302
 303                 case IRQ_TYPE_EDGE_FALLING:
 304                         newvalue = S3C2410_EXTINT_FALLEDGE;
 305                         break;
 306
 307                 case IRQ_TYPE_EDGE_BOTH:
 308                         newvalue = S3C2410_EXTINT_BOTHEDGE;
 309                         break;
 310
 311                 case IRQ_TYPE_LEVEL_LOW:
 312                         newvalue = S3C2410_EXTINT_LOWLEV;
 313                         break;
 314
 315                 case IRQ_TYPE_LEVEL_HIGH:
 316                         newvalue = S3C2410_EXTINT_HILEV;
 317                         break;
 318
 319                 default:
 320                         printk(KERN_ERR "No such irq type %d", type);
 321                         return -1;
 322         }
 323
 324         value = __raw_readl(extint_reg);
 325         value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
 326         __raw_writel(value, extint_reg);
 327
 328         return 0;
 329 }
 330
 331 static struct irq_chip s3c_irqext_chip = {
 332         .name           = "s3c-ext",
 333         .mask           = s3c_irqext_mask,
 334         .unmask         = s3c_irqext_unmask,
 335         .ack            = s3c_irqext_ack,
 336         .set_type       = s3c_irqext_type,
 337         .set_wake       = s3c_irqext_wake
 338 };
 339
 340 static struct irq_chip s3c_irq_eint0t4 = {
 341         .name           = "s3c-ext0",
 342         .ack            = s3c_irq_ack,
 343         .mask           = s3c_irq_mask,
 344         .unmask         = s3c_irq_unmask,
 345         .set_wake       = s3c_irq_wake,
 346         .set_type       = s3c_irqext_type,
 347 };
 348
 349 /* mask values for the parent registers for each of the interrupt types */
 350
 351 #define INTMSK_UART0     (1UL << (IRQ_UART0 - IRQ_EINT0))
 352 #define INTMSK_UART1     (1UL << (IRQ_UART1 - IRQ_EINT0))
 353 #define INTMSK_UART2     (1UL << (IRQ_UART2 - IRQ_EINT0))
 354 #define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
 355
 356
 357 /* UART0 */
 358
 359 static void
 360 s3c_irq_uart0_mask(unsigned int irqno)
 361 {
 362         s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
 363 }
 364
 365 static void
 366 s3c_irq_uart0_unmask(unsigned int irqno)
 367 {
 368         s3c_irqsub_unmask(irqno, INTMSK_UART0);
 369 }
 370
 371 static void
 372 s3c_irq_uart0_ack(unsigned int irqno)
 373 {
 374         s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
 375 }
 376
 377 static struct irq_chip s3c_irq_uart0 = {
 378         .name           = "s3c-uart0",
 379         .mask           = s3c_irq_uart0_mask,
 380         .unmask         = s3c_irq_uart0_unmask,
 381         .ack            = s3c_irq_uart0_ack,
 382 };
 383
 384 /* UART1 */
 385
 386 static void
 387 s3c_irq_uart1_mask(unsigned int irqno)
 388 {
 389         s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
 390 }
 391
 392 static void
 393 s3c_irq_uart1_unmask(unsigned int irqno)
 394 {
 395         s3c_irqsub_unmask(irqno, INTMSK_UART1);
 396 }
 397
 398 static void
 399 s3c_irq_uart1_ack(unsigned int irqno)
 400 {
 401         s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
 402 }
 403
 404 static struct irq_chip s3c_irq_uart1 = {
 405         .name           = "s3c-uart1",
 406         .mask           = s3c_irq_uart1_mask,
 407         .unmask         = s3c_irq_uart1_unmask,
 408         .ack            = s3c_irq_uart1_ack,
 409 };
 410
 411 /* UART2 */
 412
 413 static void
 414 s3c_irq_uart2_mask(unsigned int irqno)
 415 {
 416         s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
 417 }
 418
 419 static void
 420 s3c_irq_uart2_unmask(unsigned int irqno)
 421 {
 422         s3c_irqsub_unmask(irqno, INTMSK_UART2);
 423 }
 424
 425 static void
 426 s3c_irq_uart2_ack(unsigned int irqno)
 427 {
 428         s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
 429 }
 430
 431 static struct irq_chip s3c_irq_uart2 = {
 432         .name           = "s3c-uart2",
 433         .mask           = s3c_irq_uart2_mask,
 434         .unmask         = s3c_irq_uart2_unmask,
 435         .ack            = s3c_irq_uart2_ack,
 436 };
 437
 438 /* ADC and Touchscreen */
 439
 440 static void
 441 s3c_irq_adc_mask(unsigned int irqno)
 442 {
 443         s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
 444 }
 445
 446 static void
 447 s3c_irq_adc_unmask(unsigned int irqno)
 448 {
 449         s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
 450 }
 451
 452 static void
 453 s3c_irq_adc_ack(unsigned int irqno)
 454 {
 455         s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
 456 }
 457
 458 static struct irq_chip s3c_irq_adc = {
 459         .name           = "s3c-adc",
 460         .mask           = s3c_irq_adc_mask,
 461         .unmask         = s3c_irq_adc_unmask,
 462         .ack            = s3c_irq_adc_ack,
 463 };
 464
 465 /* irq demux for adc */
 466 static void s3c_irq_demux_adc(unsigned int irq,
 467                               struct irq_desc *desc)
 468 {
 469         unsigned int subsrc, submsk;
 470         unsigned int offset = 9;
 471         struct irq_desc *mydesc;
 472
 473         /* read the current pending interrupts, and the mask
 474          * for what it is available */
 475
 476         subsrc = __raw_readl(S3C2410_SUBSRCPND);
 477         submsk = __raw_readl(S3C2410_INTSUBMSK);
 478
 479         subsrc &= ~submsk;
 480         subsrc >>= offset;
 481         subsrc &= 3;
 482
 483         if (subsrc != 0) {
 484                 if (subsrc & 1) {
 485                         mydesc = irq_desc + IRQ_TC;
 486                         desc_handle_irq(IRQ_TC, mydesc);
 487                 }
 488                 if (subsrc & 2) {
 489                         mydesc = irq_desc + IRQ_ADC;
 490                         desc_handle_irq(IRQ_ADC, mydesc);
 491                 }
 492         }
 493 }
 494
 495 static void s3c_irq_demux_uart(unsigned int start)
 496 {
 497         unsigned int subsrc, submsk;
 498         unsigned int offset = start - IRQ_S3CUART_RX0;
 499         struct irq_desc *desc;
 500
 501         /* read the current pending interrupts, and the mask
 502          * for what it is available */
 503
 504         subsrc = __raw_readl(S3C2410_SUBSRCPND);
 505         submsk = __raw_readl(S3C2410_INTSUBMSK);
 506
 507         irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
 508                 start, offset, subsrc, submsk);
 509
 510         subsrc &= ~submsk;
 511         subsrc >>= offset;
 512         subsrc &= 7;
 513
 514         if (subsrc != 0) {
 515                 desc = irq_desc + start;
 516
 517                 if (subsrc & 1)
 518                         desc_handle_irq(start, desc);
 519
 520                 desc++;
 521
 522                 if (subsrc & 2)
 523                         desc_handle_irq(start+1, desc);
 524
 525                 desc++;
 526
 527                 if (subsrc & 4)
 528                         desc_handle_irq(start+2, desc);
 529         }
 530 }
 531
 532 /* uart demux entry points */
 533
 534 static void
 535 s3c_irq_demux_uart0(unsigned int irq,
 536                     struct irq_desc *desc)
 537 {
 538         irq = irq;
 539         s3c_irq_demux_uart(IRQ_S3CUART_RX0);
 540 }
 541
 542 static void
 543 s3c_irq_demux_uart1(unsigned int irq,
 544                     struct irq_desc *desc)
 545 {
 546         irq = irq;
 547         s3c_irq_demux_uart(IRQ_S3CUART_RX1);
 548 }
 549
 550 static void
 551 s3c_irq_demux_uart2(unsigned int irq,
 552                     struct irq_desc *desc)
 553 {
 554         irq = irq;
 555         s3c_irq_demux_uart(IRQ_S3CUART_RX2);
 556 }
 557
 558 static void
 559 s3c_irq_demux_extint8(unsigned int irq,
 560                       struct irq_desc *desc)
 561 {
 562         unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
 563         unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
 564
 565         eintpnd &= ~eintmsk;
 566         eintpnd &= ~0xff;       /* ignore lower irqs */
 567
 568         /* we may as well handle all the pending IRQs here */
 569
 570         while (eintpnd) {
 571                 irq = __ffs(eintpnd);
 572                 eintpnd &= ~(1<<irq);
 573
 574                 irq += (IRQ_EINT4 - 4);
 575                 desc_handle_irq(irq, irq_desc + irq);
 576         }
 577
 578 }
 579
 580 static void
 581 s3c_irq_demux_extint4t7(unsigned int irq,
 582                         struct irq_desc *desc)
 583 {
 584         unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
 585         unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
 586
 587         eintpnd &= ~eintmsk;
 588         eintpnd &= 0xff;        /* only lower irqs */
 589
 590         /* we may as well handle all the pending IRQs here */
 591
 592         while (eintpnd) {
 593                 irq = __ffs(eintpnd);
 594                 eintpnd &= ~(1<<irq);
 595
 596                 irq += (IRQ_EINT4 - 4);
 597
 598                 desc_handle_irq(irq, irq_desc + irq);
 599         }
 600 }
 601
 602 #ifdef CONFIG_PM
 603
 604 static struct sleep_save irq_save[] = {
 605         SAVE_ITEM(S3C2410_INTMSK),
 606         SAVE_ITEM(S3C2410_INTSUBMSK),
 607 };
 608
 609 /* the extint values move between the s3c2410/s3c2440 and the s3c2412
 610  * so we use an array to hold them, and to calculate the address of
 611  * the register at run-time
 612 */
 613
 614 static unsigned long save_extint[3];
 615 static unsigned long save_eintflt[4];
 616 static unsigned long save_eintmask;
 617
 618 int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
 619 {
 620         unsigned int i;
 621
 622         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
 623                 save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
 624
 625         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
 626                 save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
 627
 628         s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
 629         save_eintmask = __raw_readl(S3C24XX_EINTMASK);
 630
 631         return 0;
 632 }
 633
 634 int s3c24xx_irq_resume(struct sys_device *dev)
 635 {
 636         unsigned int i;
 637
 638         for (i = 0; i < ARRAY_SIZE(save_extint); i++)
 639                 __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
 640
 641         for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
 642                 __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
 643
 644         s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
 645         __raw_writel(save_eintmask, S3C24XX_EINTMASK);
 646
 647         return 0;
 648 }
 649
 650 #else
 651 #define s3c24xx_irq_suspend NULL
 652 #define s3c24xx_irq_resume  NULL
 653 #endif
 654
 655 /* s3c24xx_init_irq
 656  *
 657  * Initialise S3C2410 IRQ system
 658 */
 659
 660 void __init s3c24xx_init_irq(void)
 661 {
 662         unsigned long pend;
 663         unsigned long last;
 664         int irqno;
 665         int i;
 666
 667         irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
 668
 669         /* first, clear all interrupts pending... */
 670
 671         last = 0;
 672         for (i = 0; i < 4; i++) {
 673                 pend = __raw_readl(S3C24XX_EINTPEND);
 674
 675                 if (pend == 0 || pend == last)
 676                         break;
 677
 678                 __raw_writel(pend, S3C24XX_EINTPEND);
 679                 printk("irq: clearing pending ext status %08x\n", (int)pend);
 680                 last = pend;
 681         }
 682
 683         last = 0;
 684         for (i = 0; i < 4; i++) {
 685                 pend = __raw_readl(S3C2410_INTPND);
 686
 687                 if (pend == 0 || pend == last)
 688                         break;
 689
 690                 __raw_writel(pend, S3C2410_SRCPND);
 691                 __raw_writel(pend, S3C2410_INTPND);
 692                 printk("irq: clearing pending status %08x\n", (int)pend);
 693                 last = pend;
 694         }
 695
 696         last = 0;
 697         for (i = 0; i < 4; i++) {
 698                 pend = __raw_readl(S3C2410_SUBSRCPND);
 699
 700                 if (pend == 0 || pend == last)
 701                         break;
 702
 703                 printk("irq: clearing subpending status %08x\n", (int)pend);
 704                 __raw_writel(pend, S3C2410_SUBSRCPND);
 705                 last = pend;
 706         }
 707
 708         /* register the main interrupts */
 709
 710         irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
 711
 712         for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
 713                 /* set all the s3c2410 internal irqs */
 714
 715                 switch (irqno) {
 716                         /* deal with the special IRQs (cascaded) */
 717
 718                 case IRQ_EINT4t7:
 719                 case IRQ_EINT8t23:
 720                 case IRQ_UART0:
 721                 case IRQ_UART1:
 722                 case IRQ_UART2:
 723                 case IRQ_ADCPARENT:
 724                         set_irq_chip(irqno, &s3c_irq_level_chip);
 725                         set_irq_handler(irqno, handle_level_irq);
 726                         break;
 727
 728                 case IRQ_RESERVED6:
 729                 case IRQ_RESERVED24:
 730                         /* no IRQ here */
 731                         break;
 732
 733                 default:
 734                         //irqdbf("registering irq %d (s3c irq)\n", irqno);
 735                         set_irq_chip(irqno, &s3c_irq_chip);
 736                         set_irq_handler(irqno, handle_edge_irq);
 737                         set_irq_flags(irqno, IRQF_VALID);
 738                 }
 739         }
 740
 741         /* setup the cascade irq handlers */
 742
 743         set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
 744         set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
 745
 746         set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
 747         set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
 748         set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
 749         set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
 750
 751         /* external interrupts */
 752
 753         for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
 754                 irqdbf("registering irq %d (ext int)\n", irqno);
 755                 set_irq_chip(irqno, &s3c_irq_eint0t4);
 756                 set_irq_handler(irqno, handle_edge_irq);
 757                 set_irq_flags(irqno, IRQF_VALID);
 758         }
 759
 760         for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
 761                 irqdbf("registering irq %d (extended s3c irq)\n", irqno);
 762                 set_irq_chip(irqno, &s3c_irqext_chip);
 763                 set_irq_handler(irqno, handle_edge_irq);
 764                 set_irq_flags(irqno, IRQF_VALID);
 765         }
 766
 767         /* register the uart interrupts */
 768
 769         irqdbf("s3c2410: registering external interrupts\n");
 770
 771         for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
 772                 irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
 773                 set_irq_chip(irqno, &s3c_irq_uart0);
 774                 set_irq_handler(irqno, handle_level_irq);
 775                 set_irq_flags(irqno, IRQF_VALID);
 776         }
 777
 778         for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
 779                 irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
 780                 set_irq_chip(irqno, &s3c_irq_uart1);
 781                 set_irq_handler(irqno, handle_level_irq);
 782                 set_irq_flags(irqno, IRQF_VALID);
 783         }
 784
 785         for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
 786                 irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
 787                 set_irq_chip(irqno, &s3c_irq_uart2);
 788                 set_irq_handler(irqno, handle_level_irq);
 789                 set_irq_flags(irqno, IRQF_VALID);
 790         }
 791
 792         for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
 793                 irqdbf("registering irq %d (s3c adc irq)\n", irqno);
 794                 set_irq_chip(irqno, &s3c_irq_adc);
 795                 set_irq_handler(irqno, handle_edge_irq);
 796                 set_irq_flags(irqno, IRQF_VALID);
 797         }
 798
 799         irqdbf("s3c2410: registered interrupt handlers\n");
 800 }