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sleep-t20.S

sleep-t20.S 2.1 KB
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  1. /*
    2. 

  2.  * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
    3. 

  3.  * Copyright (c) 2011, Google, Inc.
    4. 

  4.  *
    5. 

  5.  * Author: Colin Cross <ccross@android.com>
    6. 

  6.  *         Gary King <gking@nvidia.com>
    7. 

  7.  *
    8. 

  8.  * This program is free software; you can redistribute it and/or modify it
    9. 

  9.  * under the terms and conditions of the GNU General Public License,
    10. 

  10.  * version 2, as published by the Free Software Foundation.
    11. 

  11.  *
    12. 

  12.  * This program is distributed in the hope it will be useful, but WITHOUT
    13. 

  13.  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    14. 

  14.  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
    15. 

  15.  * more details.
    16. 

  16.  *
    17. 

  17.  * You should have received a copy of the GNU General Public License
    18. 

  18.  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    19. 

  19.  */
    20. 

  20. 

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

  22. 

  23. #include <asm/assembler.h>
    24. 

  24. 

  25. #include <mach/iomap.h>
    26. 

  26. 

  27. #include "sleep.h"
    28. 

  28. #include "flowctrl.h"
    29. 

  29. 

  30. #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
    31. 

  31. /*
    32. 

  32.  * tegra20_hotplug_shutdown(void)
    33. 

  33.  *
    34. 

  34.  * puts the current cpu in reset
    35. 

  35.  * should never return
    36. 

  36.  */
    37. 

  37. ENTRY(tegra20_hotplug_shutdown)
    38. 

  38. 	/* Turn off SMP coherency */
    39. 

  39. 	exit_smp r4, r5
    40. 

  40. 

  41. 	/* Put this CPU down */
    42. 

  42. 	cpu_id	r0
    43. 

  43. 	bl	tegra20_cpu_shutdown
    44. 

  44. 	mov	pc, lr			@ should never get here
    45. 

  45. ENDPROC(tegra20_hotplug_shutdown)
    46. 

  46. 

  47. /*
    48. 

  48.  * tegra20_cpu_shutdown(int cpu)
    49. 

  49.  *
    50. 

  50.  * r0 is cpu to reset
    51. 

  51.  *
    52. 

  52.  * puts the specified CPU in wait-for-event mode on the flow controller
    53. 

  53.  * and puts the CPU in reset
    54. 

  54.  * can be called on the current cpu or another cpu
    55. 

  55.  * if called on the current cpu, does not return
    56. 

  56.  * MUST NOT BE CALLED FOR CPU 0.
    57. 

  57.  *
    58. 

  58.  * corrupts r0-r3, r12
    59. 

  59.  */
    60. 

  60. ENTRY(tegra20_cpu_shutdown)
    61. 

  61. 	cmp	r0, #0
    62. 

  62. 	moveq	pc, lr			@ must not be called for CPU 0
    63. 

  63. 

  64. 	cpu_to_halt_reg r1, r0
    65. 

  65. 	ldr	r3, =TEGRA_FLOW_CTRL_VIRT
    66. 

  66. 	mov	r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
    67. 

  67. 	str	r2, [r3, r1]		@ put flow controller in wait event mode
    68. 

  68. 	ldr	r2, [r3, r1]
    69. 

  69. 	isb
    70. 

  70. 	dsb
    71. 

  71. 	movw	r1, 0x1011
    72. 

  72. 	mov	r1, r1, lsl r0
    73. 

  73. 	ldr	r3, =TEGRA_CLK_RESET_VIRT
    74. 

  74. 	str	r1, [r3, #0x340]	@ put slave CPU in reset
    75. 

  75. 	isb
    76. 

  76. 	dsb
    77. 

  77. 	cpu_id	r3
    78. 

  78. 	cmp	r3, r0
    79. 

  79. 	beq	.
    80. 

  80. 	mov	pc, lr
    81. 

  81. ENDPROC(tegra20_cpu_shutdown)
    82. 

  82. #endif
    83.