/kern_oII/arch/arm/mach-w90x900/time.c

http://omnia2droid.googlecode.com/ · C · 79 lines · 50 code · 11 blank · 18 comment · 0 complexity · c9b850632809ee6b2dee7509dc10cfb6 MD5 · raw file 

    

  1. /*
    2. 

  2.  * linux/arch/arm/mach-w90x900/time.c
    3. 

  3.  *
    4. 

  4.  * Based on linux/arch/arm/plat-s3c24xx/time.c by Ben Dooks
    5. 

  5.  *
    6. 

  6.  * Copyright (c) 2008 Nuvoton technology corporation
    7. 

  7.  * All rights reserved.
    8. 

  8.  *
    9. 

  9.  * Wan ZongShun <mcuos.com@gmail.com>
    10. 

  10.  *
    11. 

  11.  * This program is free software; you can redistribute it and/or modify
    12. 

  12.  * it under the terms of the GNU General Public License as published by
    13. 

  13.  * the Free Software Foundation; either version 2 of the License, or
    14. 

  14.  * (at your option) any later version.
    15. 

  15.  *
    16. 

  16.  */
    17. 

  17. 

  18. #include <linux/kernel.h>
    19. 

  19. #include <linux/sched.h>
    20. 

  20. #include <linux/init.h>
    21. 

  21. #include <linux/interrupt.h>
    22. 

  22. #include <linux/err.h>
    23. 

  23. #include <linux/clk.h>
    24. 

  24. #include <linux/io.h>
    25. 

  25. #include <linux/leds.h>
    26. 

  26. 

  27. #include <asm/mach-types.h>
    28. 

  28. #include <asm/mach/irq.h>
    29. 

  29. #include <asm/mach/time.h>
    30. 

  30. 

  31. #include <mach/map.h>
    32. 

  32. #include <mach/regs-timer.h>
    33. 

  33. 

  34. static unsigned long w90x900_gettimeoffset(void)
    35. 

  35. {
    36. 

  36. 	return 0;
    37. 

  37. }
    38. 

  38. 

  39. /*IRQ handler for the timer*/
    40. 

  40. 

  41. static irqreturn_t
    42. 

  42. w90x900_timer_interrupt(int irq, void *dev_id)
    43. 

  43. {
    44. 

  44. 	timer_tick();
    45. 

  45. 	__raw_writel(0x01, REG_TISR); /* clear TIF0 */
    46. 

  46. 	return IRQ_HANDLED;
    47. 

  47. }
    48. 

  48. 

  49. static struct irqaction w90x900_timer_irq = {
    50. 

  50. 	.name		= "w90x900 Timer Tick",
    51. 

  51. 	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
    52. 

  52. 	.handler	= w90x900_timer_interrupt,
    53. 

  53. };
    54. 

  54. 

  55. /*Set up timer reg.*/
    56. 

  56. 

  57. static void w90x900_timer_setup(void)
    58. 

  58. {
    59. 

  59. 	__raw_writel(0, REG_TCSR0);
    60. 

  60. 	__raw_writel(0, REG_TCSR1);
    61. 

  61. 	__raw_writel(0, REG_TCSR2);
    62. 

  62. 	__raw_writel(0, REG_TCSR3);
    63. 

  63. 	__raw_writel(0, REG_TCSR4);
    64. 

  64. 	__raw_writel(0x1F, REG_TISR);
    65. 

  65. 	__raw_writel(15000000/(100 * 100), REG_TICR0);
    66. 

  66. 	__raw_writel(0x68000063, REG_TCSR0);
    67. 

  67. }
    68. 

  68. 

  69. static void __init w90x900_timer_init(void)
    70. 

  70. {
    71. 

  71. 	w90x900_timer_setup();
    72. 

  72. 	setup_irq(IRQ_TIMER0, &w90x900_timer_irq);
    73. 

  73. }
    74. 

  74. 

  75. struct sys_timer w90x900_timer = {
    76. 

  76. 	.init		= w90x900_timer_init,
    77. 

  77. 	.offset		= w90x900_gettimeoffset,
    78. 

  78. 	.resume		= w90x900_timer_setup
    79. 

  79. };
    80.