arch/arm/mach-ixp2000/core.c

   1 /*
   2  * arch/arm/mach-ixp2000/core.c
   3  *
   4  * Common routines used by all IXP2400/2800 based platforms.
   5  *
   6  * Author: Deepak Saxena <dsaxena@plexity.net>
   7  *
   8  * Copyright 2004 (C) MontaVista Software, Inc.
   9  *
  10  * Based on work Copyright (C) 2002-2003 Intel Corporation
  11  *
  12  * This file is licensed under the terms of the GNU General Public
  13  * License version 2. This program is licensed "as is" without any
  14  * warranty of any kind, whether express or implied.
  15  */
  16 #include <linux/gpio.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/serial.h>
  24 #include <linux/tty.h>
  25 #include <linux/bitops.h>
  26 #include <linux/serial_8250.h>
  27 #include <linux/mm.h>
  28 #include <linux/export.h>
  29
  30 #include <asm/types.h>
  31 #include <asm/setup.h>
  32 #include <asm/memory.h>
  33 #include <mach/hardware.h>
  34 #include <asm/irq.h>
  35 #include <asm/system.h>
  36 #include <asm/tlbflush.h>
  37 #include <asm/pgtable.h>
  38
  39 #include <asm/mach/map.h>
  40 #include <asm/mach/time.h>
  41 #include <asm/mach/irq.h>
  42
  43 #include <mach/gpio-ixp2000.h>
  44
  45 static DEFINE_SPINLOCK(ixp2000_slowport_lock);
  46 static unsigned long ixp2000_slowport_irq_flags;
  47
  48 /*************************************************************************
  49  * Slowport access routines
  50  *************************************************************************/
  51 void ixp2000_acquire_slowport(struct slowport_cfg *new_cfg, struct slowport_cfg *old_cfg)
  52 {
  53         spin_lock_irqsave(&ixp2000_slowport_lock, ixp2000_slowport_irq_flags);
  54
  55         old_cfg->CCR = *IXP2000_SLOWPORT_CCR;
  56         old_cfg->WTC = *IXP2000_SLOWPORT_WTC2;
  57         old_cfg->RTC = *IXP2000_SLOWPORT_RTC2;
  58         old_cfg->PCR = *IXP2000_SLOWPORT_PCR;
  59         old_cfg->ADC = *IXP2000_SLOWPORT_ADC;
  60
  61         ixp2000_reg_write(IXP2000_SLOWPORT_CCR, new_cfg->CCR);
  62         ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, new_cfg->WTC);
  63         ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, new_cfg->RTC);
  64         ixp2000_reg_write(IXP2000_SLOWPORT_PCR, new_cfg->PCR);
  65         ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, new_cfg->ADC);
  66 }
  67
  68 void ixp2000_release_slowport(struct slowport_cfg *old_cfg)
  69 {
  70         ixp2000_reg_write(IXP2000_SLOWPORT_CCR, old_cfg->CCR);
  71         ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, old_cfg->WTC);
  72         ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, old_cfg->RTC);
  73         ixp2000_reg_write(IXP2000_SLOWPORT_PCR, old_cfg->PCR);
  74         ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, old_cfg->ADC);
  75
  76         spin_unlock_irqrestore(&ixp2000_slowport_lock,
  77                                         ixp2000_slowport_irq_flags);
  78 }
  79
  80 /*************************************************************************
  81  * Chip specific mappings shared by all IXP2000 systems
  82  *************************************************************************/
  83 static struct map_desc ixp2000_io_desc[] __initdata = {
  84         {
  85                 .virtual        = IXP2000_CAP_VIRT_BASE,
  86                 .pfn            = __phys_to_pfn(IXP2000_CAP_PHYS_BASE),
  87                 .length         = IXP2000_CAP_SIZE,
  88                 .type           = MT_DEVICE,
  89         }, {
  90                 .virtual        = IXP2000_INTCTL_VIRT_BASE,
  91                 .pfn            = __phys_to_pfn(IXP2000_INTCTL_PHYS_BASE),
  92                 .length         = IXP2000_INTCTL_SIZE,
  93                 .type           = MT_DEVICE,
  94         }, {
  95                 .virtual        = IXP2000_PCI_CREG_VIRT_BASE,
  96                 .pfn            = __phys_to_pfn(IXP2000_PCI_CREG_PHYS_BASE),
  97                 .length         = IXP2000_PCI_CREG_SIZE,
  98                 .type           = MT_DEVICE,
  99         }, {
 100                 .virtual        = IXP2000_PCI_CSR_VIRT_BASE,
 101                 .pfn            = __phys_to_pfn(IXP2000_PCI_CSR_PHYS_BASE),
 102                 .length         = IXP2000_PCI_CSR_SIZE,
 103                 .type           = MT_DEVICE,
 104         }, {
 105                 .virtual        = IXP2000_MSF_VIRT_BASE,
 106                 .pfn            = __phys_to_pfn(IXP2000_MSF_PHYS_BASE),
 107                 .length         = IXP2000_MSF_SIZE,
 108                 .type           = MT_DEVICE,
 109         }, {
 110                 .virtual        = IXP2000_SCRATCH_RING_VIRT_BASE,
 111                 .pfn            = __phys_to_pfn(IXP2000_SCRATCH_RING_PHYS_BASE),
 112                 .length         = IXP2000_SCRATCH_RING_SIZE,
 113                 .type           = MT_DEVICE,
 114         }, {
 115                 .virtual        = IXP2000_SRAM0_VIRT_BASE,
 116                 .pfn            = __phys_to_pfn(IXP2000_SRAM0_PHYS_BASE),
 117                 .length         = IXP2000_SRAM0_SIZE,
 118                 .type           = MT_DEVICE,
 119         }, {
 120                 .virtual        = IXP2000_PCI_IO_VIRT_BASE,
 121                 .pfn            = __phys_to_pfn(IXP2000_PCI_IO_PHYS_BASE),
 122                 .length         = IXP2000_PCI_IO_SIZE,
 123                 .type           = MT_DEVICE,
 124         }, {
 125                 .virtual        = IXP2000_PCI_CFG0_VIRT_BASE,
 126                 .pfn            = __phys_to_pfn(IXP2000_PCI_CFG0_PHYS_BASE),
 127                 .length         = IXP2000_PCI_CFG0_SIZE,
 128                 .type           = MT_DEVICE,
 129         }, {
 130                 .virtual        = IXP2000_PCI_CFG1_VIRT_BASE,
 131                 .pfn            = __phys_to_pfn(IXP2000_PCI_CFG1_PHYS_BASE),
 132                 .length         = IXP2000_PCI_CFG1_SIZE,
 133                 .type           = MT_DEVICE,
 134         }
 135 };
 136
 137 void __init ixp2000_map_io(void)
 138 {
 139         iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
 140
 141         /* Set slowport to 8-bit mode.  */
 142         ixp2000_reg_wrb(IXP2000_SLOWPORT_FRM, 1);
 143 }
 144
 145
 146 /*************************************************************************
 147  * Serial port support for IXP2000
 148  *************************************************************************/
 149 static struct plat_serial8250_port ixp2000_serial_port[] = {
 150         {
 151                 .mapbase        = IXP2000_UART_PHYS_BASE,
 152                 .membase        = (char *)(IXP2000_UART_VIRT_BASE + 3),
 153                 .irq            = IRQ_IXP2000_UART,
 154                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 155                 .iotype         = UPIO_MEM,
 156                 .regshift       = 2,
 157                 .uartclk        = 50000000,
 158         },
 159         { },
 160 };
 161
 162 static struct resource ixp2000_uart_resource = {
 163         .start          = IXP2000_UART_PHYS_BASE,
 164         .end            = IXP2000_UART_PHYS_BASE + 0x1f,
 165         .flags          = IORESOURCE_MEM,
 166 };
 167
 168 static struct platform_device ixp2000_serial_device = {
 169         .name           = "serial8250",
 170         .id             = PLAT8250_DEV_PLATFORM,
 171         .dev            = {
 172                 .platform_data          = ixp2000_serial_port,
 173         },
 174         .num_resources  = 1,
 175         .resource       = &ixp2000_uart_resource,
 176 };
 177
 178 void __init ixp2000_uart_init(void)
 179 {
 180         platform_device_register(&ixp2000_serial_device);
 181 }
 182
 183
 184 /*************************************************************************
 185  * Timer-tick functions for IXP2000
 186  *************************************************************************/
 187 static unsigned ticks_per_jiffy;
 188 static unsigned ticks_per_usec;
 189 static unsigned next_jiffy_time;
 190 static volatile unsigned long *missing_jiffy_timer_csr;
 191
 192 unsigned long ixp2000_gettimeoffset (void)
 193 {
 194         unsigned long offset;
 195
 196         offset = next_jiffy_time - *missing_jiffy_timer_csr;
 197
 198         return offset / ticks_per_usec;
 199 }
 200
 201 static irqreturn_t ixp2000_timer_interrupt(int irq, void *dev_id)
 202 {
 203         /* clear timer 1 */
 204         ixp2000_reg_wrb(IXP2000_T1_CLR, 1);
 205
 206         while ((signed long)(next_jiffy_time - *missing_jiffy_timer_csr)
 207                                                         >= ticks_per_jiffy) {
 208                 timer_tick();
 209                 next_jiffy_time -= ticks_per_jiffy;
 210         }
 211
 212         return IRQ_HANDLED;
 213 }
 214
 215 static struct irqaction ixp2000_timer_irq = {
 216         .name           = "IXP2000 Timer Tick",
 217         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 218         .handler        = ixp2000_timer_interrupt,
 219 };
 220
 221 void __init ixp2000_init_time(unsigned long tick_rate)
 222 {
 223         ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
 224         ticks_per_usec = tick_rate / 1000000;
 225
 226         /*
 227          * We use timer 1 as our timer interrupt.
 228          */
 229         ixp2000_reg_write(IXP2000_T1_CLR, 0);
 230         ixp2000_reg_write(IXP2000_T1_CLD, ticks_per_jiffy - 1);
 231         ixp2000_reg_write(IXP2000_T1_CTL, (1 << 7));
 232
 233         /*
 234          * We use a second timer as a monotonic counter for tracking
 235          * missed jiffies.  The IXP2000 has four timers, but if we're
 236          * on an A-step IXP2800, timer 2 and 3 don't work, so on those
 237          * chips we use timer 4.  Timer 4 is the only timer that can
 238          * be used for the watchdog, so we use timer 2 if we're on a
 239          * non-buggy chip.
 240          */
 241         if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) {
 242                 printk(KERN_INFO "Enabling IXP2800 erratum #25 workaround\n");
 243
 244                 ixp2000_reg_write(IXP2000_T4_CLR, 0);
 245                 ixp2000_reg_write(IXP2000_T4_CLD, -1);
 246                 ixp2000_reg_wrb(IXP2000_T4_CTL, (1 << 7));
 247                 missing_jiffy_timer_csr = IXP2000_T4_CSR;
 248         } else {
 249                 ixp2000_reg_write(IXP2000_T2_CLR, 0);
 250                 ixp2000_reg_write(IXP2000_T2_CLD, -1);
 251                 ixp2000_reg_wrb(IXP2000_T2_CTL, (1 << 7));
 252                 missing_jiffy_timer_csr = IXP2000_T2_CSR;
 253         }
 254         next_jiffy_time = 0xffffffff;
 255
 256         /* register for interrupt */
 257         setup_irq(IRQ_IXP2000_TIMER1, &ixp2000_timer_irq);
 258 }
 259
 260 /*************************************************************************
 261  * GPIO helpers
 262  *************************************************************************/
 263 static unsigned long GPIO_IRQ_falling_edge;
 264 static unsigned long GPIO_IRQ_rising_edge;
 265 static unsigned long GPIO_IRQ_level_low;
 266 static unsigned long GPIO_IRQ_level_high;
 267
 268 static void update_gpio_int_csrs(void)
 269 {
 270         ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
 271         ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
 272         ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
 273         ixp2000_reg_wrb(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
 274 }
 275
 276 void gpio_line_config(int line, int direction)
 277 {
 278         unsigned long flags;
 279
 280         local_irq_save(flags);
 281         if (direction == GPIO_OUT) {
 282                 /* if it's an output, it ain't an interrupt anymore */
 283                 GPIO_IRQ_falling_edge &= ~(1 << line);
 284                 GPIO_IRQ_rising_edge &= ~(1 << line);
 285                 GPIO_IRQ_level_low &= ~(1 << line);
 286                 GPIO_IRQ_level_high &= ~(1 << line);
 287                 update_gpio_int_csrs();
 288
 289                 ixp2000_reg_wrb(IXP2000_GPIO_PDSR, 1 << line);
 290         } else if (direction == GPIO_IN) {
 291                 ixp2000_reg_wrb(IXP2000_GPIO_PDCR, 1 << line);
 292         }
 293         local_irq_restore(flags);
 294 }
 295 EXPORT_SYMBOL(gpio_line_config);
 296
 297
 298 /*************************************************************************
 299  * IRQ handling IXP2000
 300  *************************************************************************/
 301 static void ixp2000_GPIO_irq_handler(unsigned int irq, struct irq_desc *desc)
 302 {
 303         int i;
 304         unsigned long status = *IXP2000_GPIO_INST;
 305
 306         for (i = 0; i <= 7; i++) {
 307                 if (status & (1<<i)) {
 308                         generic_handle_irq(i + IRQ_IXP2000_GPIO0);
 309                 }
 310         }
 311 }
 312
 313 static int ixp2000_GPIO_irq_type(struct irq_data *d, unsigned int type)
 314 {
 315         int line = d->irq - IRQ_IXP2000_GPIO0;
 316
 317         /*
 318          * First, configure this GPIO line as an input.
 319          */
 320         ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
 321
 322         /*
 323          * Then, set the proper trigger type.
 324          */
 325         if (type & IRQ_TYPE_EDGE_FALLING)
 326                 GPIO_IRQ_falling_edge |= 1 << line;
 327         else
 328                 GPIO_IRQ_falling_edge &= ~(1 << line);
 329         if (type & IRQ_TYPE_EDGE_RISING)
 330                 GPIO_IRQ_rising_edge |= 1 << line;
 331         else
 332                 GPIO_IRQ_rising_edge &= ~(1 << line);
 333         if (type & IRQ_TYPE_LEVEL_LOW)
 334                 GPIO_IRQ_level_low |= 1 << line;
 335         else
 336                 GPIO_IRQ_level_low &= ~(1 << line);
 337         if (type & IRQ_TYPE_LEVEL_HIGH)
 338                 GPIO_IRQ_level_high |= 1 << line;
 339         else
 340                 GPIO_IRQ_level_high &= ~(1 << line);
 341         update_gpio_int_csrs();
 342
 343         return 0;
 344 }
 345
 346 static void ixp2000_GPIO_irq_mask_ack(struct irq_data *d)
 347 {
 348         unsigned int irq = d->irq;
 349
 350         ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
 351
 352         ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
 353         ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
 354         ixp2000_reg_wrb(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0)));
 355 }
 356
 357 static void ixp2000_GPIO_irq_mask(struct irq_data *d)
 358 {
 359         unsigned int irq = d->irq;
 360
 361         ixp2000_reg_wrb(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
 362 }
 363
 364 static void ixp2000_GPIO_irq_unmask(struct irq_data *d)
 365 {
 366         unsigned int irq = d->irq;
 367
 368         ixp2000_reg_write(IXP2000_GPIO_INSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
 369 }
 370
 371 static struct irq_chip ixp2000_GPIO_irq_chip = {
 372         .irq_ack        = ixp2000_GPIO_irq_mask_ack,
 373         .irq_mask       = ixp2000_GPIO_irq_mask,
 374         .irq_unmask     = ixp2000_GPIO_irq_unmask,
 375         .irq_set_type   = ixp2000_GPIO_irq_type,
 376 };
 377
 378 static void ixp2000_pci_irq_mask(struct irq_data *d)
 379 {
 380         unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
 381         if (d->irq == IRQ_IXP2000_PCIA)
 382                 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 26)));
 383         else if (d->irq == IRQ_IXP2000_PCIB)
 384                 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 27)));
 385 }
 386
 387 static void ixp2000_pci_irq_unmask(struct irq_data *d)
 388 {
 389         unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
 390         if (d->irq == IRQ_IXP2000_PCIA)
 391                 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 26)));
 392         else if (d->irq == IRQ_IXP2000_PCIB)
 393                 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 27)));
 394 }
 395
 396 /*
 397  * Error interrupts. These are used extensively by the microengine drivers
 398  */
 399 static void ixp2000_err_irq_handler(unsigned int irq, struct irq_desc *desc)
 400 {
 401         int i;
 402         unsigned long status = *IXP2000_IRQ_ERR_STATUS;
 403
 404         for(i = 31; i >= 0; i--) {
 405                 if(status & (1 << i)) {
 406                         generic_handle_irq(IRQ_IXP2000_DRAM0_MIN_ERR + i);
 407                 }
 408         }
 409 }
 410
 411 static void ixp2000_err_irq_mask(struct irq_data *d)
 412 {
 413         ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_CLR,
 414                         (1 << (d->irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
 415 }
 416
 417 static void ixp2000_err_irq_unmask(struct irq_data *d)
 418 {
 419         ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_SET,
 420                         (1 << (d->irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
 421 }
 422
 423 static struct irq_chip ixp2000_err_irq_chip = {
 424         .irq_ack        = ixp2000_err_irq_mask,
 425         .irq_mask       = ixp2000_err_irq_mask,
 426         .irq_unmask     = ixp2000_err_irq_unmask
 427 };
 428
 429 static struct irq_chip ixp2000_pci_irq_chip = {
 430         .irq_ack        = ixp2000_pci_irq_mask,
 431         .irq_mask       = ixp2000_pci_irq_mask,
 432         .irq_unmask     = ixp2000_pci_irq_unmask
 433 };
 434
 435 static void ixp2000_irq_mask(struct irq_data *d)
 436 {
 437         ixp2000_reg_wrb(IXP2000_IRQ_ENABLE_CLR, (1 << d->irq));
 438 }
 439
 440 static void ixp2000_irq_unmask(struct irq_data *d)
 441 {
 442         ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << d->irq));
 443 }
 444
 445 static struct irq_chip ixp2000_irq_chip = {
 446         .irq_ack        = ixp2000_irq_mask,
 447         .irq_mask       = ixp2000_irq_mask,
 448         .irq_unmask     = ixp2000_irq_unmask
 449 };
 450
 451 void __init ixp2000_init_irq(void)
 452 {
 453         int irq;
 454
 455         /*
 456          * Mask all sources
 457          */
 458         ixp2000_reg_write(IXP2000_IRQ_ENABLE_CLR, 0xffffffff);
 459         ixp2000_reg_write(IXP2000_FIQ_ENABLE_CLR, 0xffffffff);
 460
 461         /* clear all GPIO edge/level detects */
 462         ixp2000_reg_write(IXP2000_GPIO_REDR, 0);
 463         ixp2000_reg_write(IXP2000_GPIO_FEDR, 0);
 464         ixp2000_reg_write(IXP2000_GPIO_LSHR, 0);
 465         ixp2000_reg_write(IXP2000_GPIO_LSLR, 0);
 466         ixp2000_reg_write(IXP2000_GPIO_INCR, -1);
 467
 468         /* clear PCI interrupt sources */
 469         ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, 0);
 470
 471         /*
 472          * Certain bits in the IRQ status register of the
 473          * IXP2000 are reserved. Instead of trying to map
 474          * things non 1:1 from bit position to IRQ number,
 475          * we mark the reserved IRQs as invalid. This makes
 476          * our mask/unmask code much simpler.
 477          */
 478         for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) {
 479                 if ((1 << irq) & IXP2000_VALID_IRQ_MASK) {
 480                         irq_set_chip_and_handler(irq, &ixp2000_irq_chip,
 481                                                  handle_level_irq);
 482                         set_irq_flags(irq, IRQF_VALID);
 483                 } else set_irq_flags(irq, 0);
 484         }
 485
 486         for (irq = IRQ_IXP2000_DRAM0_MIN_ERR; irq <= IRQ_IXP2000_SP_INT; irq++) {
 487                 if((1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)) &
 488                                 IXP2000_VALID_ERR_IRQ_MASK) {
 489                         irq_set_chip_and_handler(irq, &ixp2000_err_irq_chip,
 490                                                  handle_level_irq);
 491                         set_irq_flags(irq, IRQF_VALID);
 492                 }
 493                 else
 494                         set_irq_flags(irq, 0);
 495         }
 496         irq_set_chained_handler(IRQ_IXP2000_ERRSUM, ixp2000_err_irq_handler);
 497
 498         for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) {
 499                 irq_set_chip_and_handler(irq, &ixp2000_GPIO_irq_chip,
 500                                          handle_level_irq);
 501                 set_irq_flags(irq, IRQF_VALID);
 502         }
 503         irq_set_chained_handler(IRQ_IXP2000_GPIO, ixp2000_GPIO_irq_handler);
 504
 505         /*
 506          * Enable PCI irqs.  The actual PCI[AB] decoding is done in
 507          * entry-macro.S, so we don't need a chained handler for the
 508          * PCI interrupt source.
 509          */
 510         ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << IRQ_IXP2000_PCI));
 511         for (irq = IRQ_IXP2000_PCIA; irq <= IRQ_IXP2000_PCIB; irq++) {
 512                 irq_set_chip_and_handler(irq, &ixp2000_pci_irq_chip,
 513                                          handle_level_irq);
 514                 set_irq_flags(irq, IRQF_VALID);
 515         }
 516 }
 517