1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * System Control and Management Interface (SCMI) System Power Protocol
4 *
5 * Copyright (C) 2020-2021 ARM Ltd.
6 */
7
8 #define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
9
10 #include <linux/module.h>
11 #include <linux/scmi_protocol.h>
12
13 #include "common.h"
14 #include "notify.h"
15
16 #define SCMI_SYSTEM_NUM_SOURCES 1
17
18 enum scmi_system_protocol_cmd {
19 SYSTEM_POWER_STATE_NOTIFY = 0x5,
20 };
21
22 struct scmi_system_power_state_notify {
23 __le32 notify_enable;
24 };
25
26 struct scmi_system_power_state_notifier_payld {
27 __le32 agent_id;
28 __le32 flags;
29 __le32 system_state;
30 };
31
32 struct scmi_system_info {
33 u32 version;
34 };
35
scmi_system_request_notify(const struct scmi_protocol_handle * ph,bool enable)36 static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
37 bool enable)
38 {
39 int ret;
40 struct scmi_xfer *t;
41 struct scmi_system_power_state_notify *notify;
42
43 ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
44 sizeof(*notify), 0, &t);
45 if (ret)
46 return ret;
47
48 notify = t->tx.buf;
49 notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
50
51 ret = ph->xops->do_xfer(ph, t);
52
53 ph->xops->xfer_put(ph, t);
54 return ret;
55 }
56
scmi_system_set_notify_enabled(const struct scmi_protocol_handle * ph,u8 evt_id,u32 src_id,bool enable)57 static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
58 u8 evt_id, u32 src_id, bool enable)
59 {
60 int ret;
61
62 ret = scmi_system_request_notify(ph, enable);
63 if (ret)
64 pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
65
66 return ret;
67 }
68
69 static void *
scmi_system_fill_custom_report(const struct scmi_protocol_handle * ph,u8 evt_id,ktime_t timestamp,const void * payld,size_t payld_sz,void * report,u32 * src_id)70 scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
71 u8 evt_id, ktime_t timestamp,
72 const void *payld, size_t payld_sz,
73 void *report, u32 *src_id)
74 {
75 const struct scmi_system_power_state_notifier_payld *p = payld;
76 struct scmi_system_power_state_notifier_report *r = report;
77
78 if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
79 sizeof(*p) != payld_sz)
80 return NULL;
81
82 r->timestamp = timestamp;
83 r->agent_id = le32_to_cpu(p->agent_id);
84 r->flags = le32_to_cpu(p->flags);
85 r->system_state = le32_to_cpu(p->system_state);
86 *src_id = 0;
87
88 return r;
89 }
90
91 static const struct scmi_event system_events[] = {
92 {
93 .id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
94 .max_payld_sz =
95 sizeof(struct scmi_system_power_state_notifier_payld),
96 .max_report_sz =
97 sizeof(struct scmi_system_power_state_notifier_report),
98 },
99 };
100
101 static const struct scmi_event_ops system_event_ops = {
102 .set_notify_enabled = scmi_system_set_notify_enabled,
103 .fill_custom_report = scmi_system_fill_custom_report,
104 };
105
106 static const struct scmi_protocol_events system_protocol_events = {
107 .queue_sz = SCMI_PROTO_QUEUE_SZ,
108 .ops = &system_event_ops,
109 .evts = system_events,
110 .num_events = ARRAY_SIZE(system_events),
111 .num_sources = SCMI_SYSTEM_NUM_SOURCES,
112 };
113
scmi_system_protocol_init(const struct scmi_protocol_handle * ph)114 static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
115 {
116 u32 version;
117 struct scmi_system_info *pinfo;
118
119 ph->xops->version_get(ph, &version);
120
121 dev_dbg(ph->dev, "System Power Version %d.%d\n",
122 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
123
124 pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
125 if (!pinfo)
126 return -ENOMEM;
127
128 pinfo->version = version;
129 return ph->set_priv(ph, pinfo);
130 }
131
132 static const struct scmi_protocol scmi_system = {
133 .id = SCMI_PROTOCOL_SYSTEM,
134 .owner = THIS_MODULE,
135 .instance_init = &scmi_system_protocol_init,
136 .ops = NULL,
137 .events = &system_protocol_events,
138 };
139
140 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)
141