| Joseph Lo | 453689e | 2012-08-16 17:31:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved. |
| 3 | * Copyright (c) 2011, Google, Inc. |
| 4 | * |
| 5 | * Author: Colin Cross <ccross@android.com> |
| 6 | * Gary King <gking@nvidia.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms and conditions of the GNU General Public License, |
| 10 | * version 2, as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/linkage.h> |
| 22 | |
| 23 | #include <asm/assembler.h> |
| 24 | |
| 25 | #include <mach/iomap.h> |
| 26 | |
| 27 | #include "sleep.h" |
| 28 | #include "flowctrl.h" |
| 29 | |
| 30 | #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP) |
| 31 | /* |
| 32 | * tegra20_hotplug_shutdown(void) |
| 33 | * |
| 34 | * puts the current cpu in reset |
| 35 | * should never return |
| 36 | */ |
| 37 | ENTRY(tegra20_hotplug_shutdown) |
| 38 | /* Turn off SMP coherency */ |
| 39 | exit_smp r4, r5 |
| 40 | |
| 41 | /* Put this CPU down */ |
| 42 | cpu_id r0 |
| 43 | bl tegra20_cpu_shutdown |
| 44 | mov pc, lr @ should never get here |
| 45 | ENDPROC(tegra20_hotplug_shutdown) |
| 46 | |
| 47 | /* |
| 48 | * tegra20_cpu_shutdown(int cpu) |
| 49 | * |
| 50 | * r0 is cpu to reset |
| 51 | * |
| 52 | * puts the specified CPU in wait-for-event mode on the flow controller |
| 53 | * and puts the CPU in reset |
| 54 | * can be called on the current cpu or another cpu |
| 55 | * if called on the current cpu, does not return |
| 56 | * MUST NOT BE CALLED FOR CPU 0. |
| 57 | * |
| 58 | * corrupts r0-r3, r12 |
| 59 | */ |
| 60 | ENTRY(tegra20_cpu_shutdown) |
| 61 | cmp r0, #0 |
| 62 | moveq pc, lr @ must not be called for CPU 0 |
| 63 | |
| 64 | cpu_to_halt_reg r1, r0 |
| 65 | ldr r3, =TEGRA_FLOW_CTRL_VIRT |
| 66 | mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME |
| 67 | str r2, [r3, r1] @ put flow controller in wait event mode |
| 68 | ldr r2, [r3, r1] |
| 69 | isb |
| 70 | dsb |
| 71 | movw r1, 0x1011 |
| 72 | mov r1, r1, lsl r0 |
| 73 | ldr r3, =TEGRA_CLK_RESET_VIRT |
| 74 | str r1, [r3, #0x340] @ put slave CPU in reset |
| 75 | isb |
| 76 | dsb |
| 77 | cpu_id r3 |
| 78 | cmp r3, r0 |
| 79 | beq . |
| 80 | mov pc, lr |
| 81 | ENDPROC(tegra20_cpu_shutdown) |
| 82 | #endif |