treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / powerpc / sysdev / 6xx-suspend.S
blobe882524fff5aa62b978697aeabc5cb314132c8a8
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Enter and leave sleep state on chips with 6xx-style HID0
4  * power management bits, which don't leave sleep state via reset.
5  *
6  * Author: Scott Wood <scottwood@freescale.com>
7  *
8  * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
9  */
11 #include <asm/ppc_asm.h>
12 #include <asm/reg.h>
13 #include <asm/thread_info.h>
14 #include <asm/asm-offsets.h>
16 _GLOBAL(mpc6xx_enter_standby)
17         mflr    r4
19         mfspr   r5, SPRN_HID0
20         rlwinm  r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
21         oris    r5, r5, HID0_SLEEP@h
22         mtspr   SPRN_HID0, r5
23         isync
25         lis     r5, ret_from_standby@h
26         ori     r5, r5, ret_from_standby@l
27         mtlr    r5
29         lwz     r6, TI_LOCAL_FLAGS(r2)
30         ori     r6, r6, _TLF_SLEEPING
31         stw     r6, TI_LOCAL_FLAGS(r2)
33         mfmsr   r5
34         ori     r5, r5, MSR_EE
35         oris    r5, r5, MSR_POW@h
36         sync
37         mtmsr   r5
38         isync
40 1:      b       1b
42 ret_from_standby:
43         mfspr   r5, SPRN_HID0
44         rlwinm  r5, r5, 0, ~HID0_SLEEP
45         mtspr   SPRN_HID0, r5
47         mtlr    r4
48         blr