1 /*
2 * SCPI Message Protocol driver header
3 *
4 * Copyright (C) 2014 ARM Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18 #include <linux/types.h>
19
20 struct scpi_opp {
21 u32 freq;
22 u32 m_volt;
23 } __packed;
24
25 struct scpi_dvfs_info {
26 unsigned int count;
27 unsigned int latency; /* in nanoseconds */
28 struct scpi_opp *opps;
29 };
30
31 enum scpi_sensor_class {
32 TEMPERATURE,
33 VOLTAGE,
34 CURRENT,
35 POWER,
36 ENERGY,
37 };
38
39 struct scpi_sensor_info {
40 u16 sensor_id;
41 u8 class;
42 u8 trigger_type;
43 char name[20];
44 } __packed;
45
46 /**
47 * struct scpi_ops - represents the various operations provided
48 * by SCP through SCPI message protocol
49 * @get_version: returns the major and minor revision on the SCPI
50 * message protocol
51 * @clk_get_range: gets clock range limit(min - max in Hz)
52 * @clk_get_val: gets clock value(in Hz)
53 * @clk_set_val: sets the clock value, setting to 0 will disable the
54 * clock (if supported)
55 * @dvfs_get_idx: gets the Operating Point of the given power domain.
56 * OPP is an index to the list return by @dvfs_get_info
57 * @dvfs_set_idx: sets the Operating Point of the given power domain.
58 * OPP is an index to the list return by @dvfs_get_info
59 * @dvfs_get_info: returns the DVFS capabilities of the given power
60 * domain. It includes the OPP list and the latency information
61 */
62 struct scpi_ops {
63 u32 (*get_version)(void);
64 int (*clk_get_range)(u16, unsigned long *, unsigned long *);
65 unsigned long (*clk_get_val)(u16);
66 int (*clk_set_val)(u16, unsigned long);
67 int (*dvfs_get_idx)(u8);
68 int (*dvfs_set_idx)(u8, u8);
69 struct scpi_dvfs_info *(*dvfs_get_info)(u8);
70 int (*device_domain_id)(struct device *);
71 int (*get_transition_latency)(struct device *);
72 int (*add_opps_to_device)(struct device *);
73 int (*sensor_get_capability)(u16 *sensors);
74 int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
75 int (*sensor_get_value)(u16, u64 *);
76 int (*device_get_power_state)(u16);
77 int (*device_set_power_state)(u16, u8);
78 };
79
80 #if IS_REACHABLE(CONFIG_ARM_SCPI_PROTOCOL)
81 struct scpi_ops *get_scpi_ops(void);
82 #else
get_scpi_ops(void)83 static inline struct scpi_ops *get_scpi_ops(void) { return NULL; }
84 #endif
85