Merge tag 'v5.15-rc2' into spi-5.15
[platform/kernel/linux-rpi.git] / drivers / xen / acpi.c
1 /******************************************************************************
2  * acpi.c
3  * acpi file for domain 0 kernel
4  *
5  * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
6  * Copyright (c) 2011 Yu Ke ke.yu@intel.com
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2
10  * as published by the Free Software Foundation; or, when distributed
11  * separately from the Linux kernel or incorporated into other
12  * software packages, subject to the following license:
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this source file (the "Software"), to deal in the Software without
16  * restriction, including without limitation the rights to use, copy, modify,
17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18  * and to permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * IN THE SOFTWARE.
31  */
32
33 #include <xen/acpi.h>
34 #include <xen/interface/platform.h>
35 #include <asm/xen/hypercall.h>
36 #include <asm/xen/hypervisor.h>
37
38 static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
39                                             u32 val_a, u32 val_b,
40                                             bool extended)
41 {
42         unsigned int bits = extended ? 8 : 16;
43
44         struct xen_platform_op op = {
45                 .cmd = XENPF_enter_acpi_sleep,
46                 .interface_version = XENPF_INTERFACE_VERSION,
47                 .u.enter_acpi_sleep = {
48                         .val_a = (u16)val_a,
49                         .val_b = (u16)val_b,
50                         .sleep_state = sleep_state,
51                         .flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
52                 },
53         };
54
55         if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
56                  "Using more than %u bits of sleep control values %#x/%#x!"
57                  "Email xen-devel@lists.xen.org - Thank you.\n", \
58                  bits, val_a, val_b))
59                 return -1;
60
61         HYPERVISOR_platform_op(&op);
62         return 1;
63 }
64
65 int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
66                                      u32 pm1a_cnt, u32 pm1b_cnt)
67 {
68         return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
69                                                 pm1b_cnt, false);
70 }
71
72 int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
73                                      u32 val_a, u32 val_b)
74 {
75         return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
76                                                 val_b, true);
77 }