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mach-tegra
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sleep-tegra20.S

sleep-tegra20.S 2.0 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 "sleep.h"
    26. 

  26. #include "flowctrl.h"
    27. 

  27. 

  28. #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
    29. 

  29. /*
    30. 

  30.  * tegra20_hotplug_shutdown(void)
    31. 

  31.  *
    32. 

  32.  * puts the current cpu in reset
    33. 

  33.  * should never return
    34. 

  34.  */
    35. 

  35. ENTRY(tegra20_hotplug_shutdown)
    36. 

  36. 	/* Put this CPU down */
    37. 

  37. 	cpu_id	r0
    38. 

  38. 	bl	tegra20_cpu_shutdown
    39. 

  39. 	mov	pc, lr			@ should never get here
    40. 

  40. ENDPROC(tegra20_hotplug_shutdown)
    41. 

  41. 

  42. /*
    43. 

  43.  * tegra20_cpu_shutdown(int cpu)
    44. 

  44.  *
    45. 

  45.  * r0 is cpu to reset
    46. 

  46.  *
    47. 

  47.  * puts the specified CPU in wait-for-event mode on the flow controller
    48. 

  48.  * and puts the CPU in reset
    49. 

  49.  * can be called on the current cpu or another cpu
    50. 

  50.  * if called on the current cpu, does not return
    51. 

  51.  * MUST NOT BE CALLED FOR CPU 0.
    52. 

  52.  *
    53. 

  53.  * corrupts r0-r3, r12
    54. 

  54.  */
    55. 

  55. ENTRY(tegra20_cpu_shutdown)
    56. 

  56. 	cmp	r0, #0
    57. 

  57. 	moveq	pc, lr			@ must not be called for CPU 0
    58. 

  58. 

  59. 	cpu_to_halt_reg r1, r0
    60. 

  60. 	ldr	r3, =TEGRA_FLOW_CTRL_VIRT
    61. 

  61. 	mov	r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
    62. 

  62. 	str	r2, [r3, r1]		@ put flow controller in wait event mode
    63. 

  63. 	ldr	r2, [r3, r1]
    64. 

  64. 	isb
    65. 

  65. 	dsb
    66. 

  66. 	movw	r1, 0x1011
    67. 

  67. 	mov	r1, r1, lsl r0
    68. 

  68. 	ldr	r3, =TEGRA_CLK_RESET_VIRT
    69. 

  69. 	str	r1, [r3, #0x340]	@ put slave CPU in reset
    70. 

  70. 	isb
    71. 

  71. 	dsb
    72. 

  72. 	cpu_id	r3
    73. 

  73. 	cmp	r3, r0
    74. 

  74. 	beq	.
    75. 

  75. 	mov	pc, lr
    76. 

  76. ENDPROC(tegra20_cpu_shutdown)
    77. 

  77. #endif
    78.