| Krzysztof Kozlowski | 84b2170 | 2017-12-25 20:54:32 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| 2 | /* |
| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 3 | * Copyright (c) 2007 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * S3C2412 Power Manager low-level sleep support |
| Krzysztof Kozlowski | 84b2170 | 2017-12-25 20:54:32 +0100 | [diff] [blame] | 7 | */ |
| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 8 | |
| 9 | #include <linux/linkage.h> |
| 10 | #include <asm/assembler.h> |
| Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 11 | #include <mach/hardware.h> |
| 12 | #include <mach/map.h> |
| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 13 | |
| Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 14 | #include <mach/regs-irq.h> |
| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 15 | |
| 16 | .text |
| 17 | |
| 18 | .global s3c2412_sleep_enter |
| 19 | |
| 20 | s3c2412_sleep_enter: |
| 21 | mov r0, #0 /* argument for coprocessors */ |
| 22 | ldr r1, =S3C2410_INTPND |
| 23 | ldr r2, =S3C2410_SRCPND |
| 24 | ldr r3, =S3C2410_EINTPEND |
| 25 | |
| 26 | teq r0, r0 |
| 27 | bl s3c2412_sleep_enter1 |
| 28 | teq pc, r0 |
| 29 | bl s3c2412_sleep_enter1 |
| 30 | |
| 31 | .align 5 |
| 32 | |
| 33 | /* this is called twice, first with the Z flag to ensure that the |
| 34 | * instructions have been loaded into the cache, and the second |
| 35 | * time to try and suspend the system. |
| 36 | */ |
| 37 | s3c2412_sleep_enter1: |
| 38 | mcr p15, 0, r0, c7, c10, 4 |
| 39 | mcrne p15, 0, r0, c7, c0, 4 |
| 40 | |
| 41 | /* if we return from here, it is because an interrupt was |
| 42 | * active when we tried to shutdown. Try and ack the IRQ and |
| 43 | * retry, as simply returning causes the system to lock. |
| 44 | */ |
| 45 | |
| Arnd Bergmann | 2815774 | 2013-01-08 21:58:31 +0000 | [diff] [blame] | 46 | ldrne r9, [r1] |
| 47 | strne r9, [r1] |
| 48 | ldrne r9, [r2] |
| 49 | strne r9, [r2] |
| 50 | ldrne r9, [r3] |
| 51 | strne r9, [r3] |
| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 52 | bne s3c2412_sleep_enter1 |
| 53 | |
| Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 54 | ret lr |