| Peter De Schrijver | c76fcc8 | 2012-01-26 18:22:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * arch/arm/mach-tegra/sleep.S |
| 3 | * |
| 4 | * Copyright (c) 2010-2011, NVIDIA Corporation. |
| 5 | * Copyright (c) 2011, Google, Inc. |
| 6 | * |
| 7 | * Author: Colin Cross <ccross@android.com> |
| 8 | * Gary King <gking@nvidia.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 18 | * more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 23 | */ |
| 24 | |
| 25 | #include <linux/linkage.h> |
| Stephen Warren | 7175f80 | 2012-03-19 09:55:12 -0600 | [diff] [blame^] | 26 | |
| 27 | #include <asm/assembler.h> |
| 28 | |
| Peter De Schrijver | c76fcc8 | 2012-01-26 18:22:02 +0200 | [diff] [blame] | 29 | #include <mach/iomap.h> |
| 30 | |
| 31 | #include "flowctrl.h" |
| 32 | |
| 33 | #define TEGRA_FLOW_CTRL_VIRT (TEGRA_FLOW_CTRL_BASE - IO_PPSB_PHYS \ |
| 34 | + IO_PPSB_VIRT) |
| 35 | |
| 36 | /* returns the offset of the flow controller halt register for a cpu */ |
| 37 | .macro cpu_to_halt_reg rd, rcpu |
| 38 | cmp \rcpu, #0 |
| 39 | subne \rd, \rcpu, #1 |
| 40 | movne \rd, \rd, lsl #3 |
| 41 | addne \rd, \rd, #0x14 |
| 42 | moveq \rd, #0 |
| 43 | .endm |
| 44 | |
| 45 | /* returns the offset of the flow controller csr register for a cpu */ |
| 46 | .macro cpu_to_csr_reg rd, rcpu |
| 47 | cmp \rcpu, #0 |
| 48 | subne \rd, \rcpu, #1 |
| 49 | movne \rd, \rd, lsl #3 |
| 50 | addne \rd, \rd, #0x18 |
| 51 | moveq \rd, #8 |
| 52 | .endm |
| 53 | |
| 54 | /* returns the ID of the current processor */ |
| 55 | .macro cpu_id, rd |
| 56 | mrc p15, 0, \rd, c0, c0, 5 |
| 57 | and \rd, \rd, #0xF |
| 58 | .endm |
| 59 | |
| 60 | /* loads a 32-bit value into a register without a data access */ |
| 61 | .macro mov32, reg, val |
| 62 | movw \reg, #:lower16:\val |
| 63 | movt \reg, #:upper16:\val |
| 64 | .endm |
| 65 | |
| 66 | /* |
| 67 | * tegra_cpu_wfi |
| 68 | * |
| 69 | * puts current CPU in clock-gated wfi using the flow controller |
| 70 | * |
| 71 | * corrupts r0-r3 |
| 72 | * must be called with MMU on |
| 73 | */ |
| 74 | |
| 75 | ENTRY(tegra_cpu_wfi) |
| 76 | cpu_id r0 |
| 77 | cpu_to_halt_reg r1, r0 |
| 78 | cpu_to_csr_reg r2, r0 |
| 79 | mov32 r0, TEGRA_FLOW_CTRL_VIRT |
| 80 | mov r3, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG |
| 81 | str r3, [r0, r2] @ clear event & interrupt status |
| 82 | mov r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT | FLOW_CTRL_JTAG_RESUME |
| 83 | str r3, [r0, r1] @ put flow controller in wait irq mode |
| 84 | dsb |
| 85 | wfi |
| 86 | mov r3, #0 |
| 87 | str r3, [r0, r1] @ clear flow controller halt status |
| 88 | mov r3, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG |
| 89 | str r3, [r0, r2] @ clear event & interrupt status |
| 90 | dsb |
| 91 | mov pc, lr |
| 92 | ENDPROC(tegra_cpu_wfi) |
| 93 | |