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 /** 32 * struct scpi_ops - represents the various operations provided 33 * by SCP through SCPI message protocol 34 * @get_version: returns the major and minor revision on the SCPI 35 * message protocol 36 * @clk_get_range: gets clock range limit(min - max in Hz) 37 * @clk_get_val: gets clock value(in Hz) 38 * @clk_set_val: sets the clock value, setting to 0 will disable the 39 * clock (if supported) 40 * @dvfs_get_idx: gets the Operating Point of the given power domain. 41 * OPP is an index to the list return by @dvfs_get_info 42 * @dvfs_set_idx: sets the Operating Point of the given power domain. 43 * OPP is an index to the list return by @dvfs_get_info 44 * @dvfs_get_info: returns the DVFS capabilities of the given power 45 * domain. It includes the OPP list and the latency information 46 */ 47 struct scpi_ops { 48 u32 (*get_version)(void); 49 int (*clk_get_range)(u16, unsigned long *, unsigned long *); 50 unsigned long (*clk_get_val)(u16); 51 int (*clk_set_val)(u16, unsigned long); 52 int (*dvfs_get_idx)(u8); 53 int (*dvfs_set_idx)(u8, u8); 54 struct scpi_dvfs_info *(*dvfs_get_info)(u8); 55 }; 56 57 #if IS_ENABLED(CONFIG_ARM_SCPI_PROTOCOL) 58 struct scpi_ops *get_scpi_ops(void); 59 #else 60 static inline struct scpi_ops *get_scpi_ops(void) { return NULL; } 61 #endif 62