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c76fcc8a PDS |
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> | |
26 | #include <mach/io.h> | |
27 | #include <mach/iomap.h> | |
28 | ||
29 | #include "flowctrl.h" | |
30 | ||
31 | #define TEGRA_FLOW_CTRL_VIRT (TEGRA_FLOW_CTRL_BASE - IO_PPSB_PHYS \ | |
32 | + IO_PPSB_VIRT) | |
33 | ||
34 | /* returns the offset of the flow controller halt register for a cpu */ | |
35 | .macro cpu_to_halt_reg rd, rcpu | |
36 | cmp \rcpu, #0 | |
37 | subne \rd, \rcpu, #1 | |
38 | movne \rd, \rd, lsl #3 | |
39 | addne \rd, \rd, #0x14 | |
40 | moveq \rd, #0 | |
41 | .endm | |
42 | ||
43 | /* returns the offset of the flow controller csr register for a cpu */ | |
44 | .macro cpu_to_csr_reg rd, rcpu | |
45 | cmp \rcpu, #0 | |
46 | subne \rd, \rcpu, #1 | |
47 | movne \rd, \rd, lsl #3 | |
48 | addne \rd, \rd, #0x18 | |
49 | moveq \rd, #8 | |
50 | .endm | |
51 | ||
52 | /* returns the ID of the current processor */ | |
53 | .macro cpu_id, rd | |
54 | mrc p15, 0, \rd, c0, c0, 5 | |
55 | and \rd, \rd, #0xF | |
56 | .endm | |
57 | ||
58 | /* loads a 32-bit value into a register without a data access */ | |
59 | .macro mov32, reg, val | |
60 | movw \reg, #:lower16:\val | |
61 | movt \reg, #:upper16:\val | |
62 | .endm | |
63 | ||
64 | /* | |
65 | * tegra_cpu_wfi | |
66 | * | |
67 | * puts current CPU in clock-gated wfi using the flow controller | |
68 | * | |
69 | * corrupts r0-r3 | |
70 | * must be called with MMU on | |
71 | */ | |
72 | ||
73 | ENTRY(tegra_cpu_wfi) | |
74 | cpu_id r0 | |
75 | cpu_to_halt_reg r1, r0 | |
76 | cpu_to_csr_reg r2, r0 | |
77 | mov32 r0, TEGRA_FLOW_CTRL_VIRT | |
78 | mov r3, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG | |
79 | str r3, [r0, r2] @ clear event & interrupt status | |
80 | mov r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT | FLOW_CTRL_JTAG_RESUME | |
81 | str r3, [r0, r1] @ put flow controller in wait irq mode | |
82 | dsb | |
83 | wfi | |
84 | mov r3, #0 | |
85 | str r3, [r0, r1] @ clear flow controller halt status | |
86 | mov r3, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG | |
87 | str r3, [r0, r2] @ clear event & interrupt status | |
88 | dsb | |
89 | mov pc, lr | |
90 | ENDPROC(tegra_cpu_wfi) | |
91 |