pm-s3c2412.c 2.7 KB

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  1. /* linux/arch/arm/mach-s3c2412/pm.c
  2. *
  3. * Copyright (c) 2006 Simtec Electronics
  4. * Ben Dooks <ben@simtec.co.uk>
  5. *
  6. * http://armlinux.simtec.co.uk/.
  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 version 2 as
  10. * published by the Free Software Foundation.
  11. */
  12. #include <linux/kernel.h>
  13. #include <linux/types.h>
  14. #include <linux/interrupt.h>
  15. #include <linux/list.h>
  16. #include <linux/timer.h>
  17. #include <linux/init.h>
  18. #include <linux/device.h>
  19. #include <linux/syscore_ops.h>
  20. #include <linux/platform_device.h>
  21. #include <linux/io.h>
  22. #include <mach/hardware.h>
  23. #include <asm/cacheflush.h>
  24. #include <asm/irq.h>
  25. #include <mach/regs-power.h>
  26. #include <mach/regs-gpio.h>
  27. #include <mach/regs-dsc.h>
  28. #include <plat/cpu.h>
  29. #include <plat/pm.h>
  30. #include <plat/s3c2412.h>
  31. extern void s3c2412_sleep_enter(void);
  32. static int s3c2412_cpu_suspend(unsigned long arg)
  33. {
  34. unsigned long tmp;
  35. /* set our standby method to sleep */
  36. tmp = __raw_readl(S3C2412_PWRCFG);
  37. tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  38. __raw_writel(tmp, S3C2412_PWRCFG);
  39. s3c2412_sleep_enter();
  40. panic("sleep resumed to originator?");
  41. }
  42. static void s3c2412_pm_prepare(void)
  43. {
  44. }
  45. static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
  46. {
  47. pm_cpu_prep = s3c2412_pm_prepare;
  48. pm_cpu_sleep = s3c2412_cpu_suspend;
  49. return 0;
  50. }
  51. static struct sleep_save s3c2412_sleep[] = {
  52. SAVE_ITEM(S3C2412_DSC0),
  53. SAVE_ITEM(S3C2412_DSC1),
  54. SAVE_ITEM(S3C2413_GPJDAT),
  55. SAVE_ITEM(S3C2413_GPJCON),
  56. SAVE_ITEM(S3C2413_GPJUP),
  57. /* save the PWRCFG to get back to original sleep method */
  58. SAVE_ITEM(S3C2412_PWRCFG),
  59. /* save the sleep configuration anyway, just in case these
  60. * get damaged during wakeup */
  61. SAVE_ITEM(S3C2412_GPBSLPCON),
  62. SAVE_ITEM(S3C2412_GPCSLPCON),
  63. SAVE_ITEM(S3C2412_GPDSLPCON),
  64. SAVE_ITEM(S3C2412_GPFSLPCON),
  65. SAVE_ITEM(S3C2412_GPGSLPCON),
  66. SAVE_ITEM(S3C2412_GPHSLPCON),
  67. SAVE_ITEM(S3C2413_GPJSLPCON),
  68. };
  69. static struct subsys_interface s3c2412_pm_interface = {
  70. .name = "s3c2412_pm",
  71. .subsys = &s3c2412_subsys,
  72. .add_dev = s3c2412_pm_add,
  73. };
  74. static __init int s3c2412_pm_init(void)
  75. {
  76. return subsys_interface_register(&s3c2412_pm_interface);
  77. }
  78. arch_initcall(s3c2412_pm_init);
  79. static int s3c2412_pm_suspend(void)
  80. {
  81. s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
  82. return 0;
  83. }
  84. static void s3c2412_pm_resume(void)
  85. {
  86. unsigned long tmp;
  87. tmp = __raw_readl(S3C2412_PWRCFG);
  88. tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
  89. tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
  90. __raw_writel(tmp, S3C2412_PWRCFG);
  91. s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
  92. }
  93. struct syscore_ops s3c2412_pm_syscore_ops = {
  94. .suspend = s3c2412_pm_suspend,
  95. .resume = s3c2412_pm_resume,
  96. };