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/* * CPPC (Collaborative Processor Performance Control) methods used * by CPUfreq drivers. * * (C) Copyright 2014, 2015 Linaro Ltd. * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; version 2 * of the License. / #ifndef _CPPC_ACPI_H #define _CPPC_ACPI_H #include <linux/acpi.h> #include <linux/mailbox_controller.h> #include <linux/mailbox_client.h> #include <linux/types.h> #include <acpi/processor.h> / Only support CPPCv2 for now. / #define CPPC_NUM_ENT 21 #define CPPC_REV 2 #define PCC_CMD_COMPLETE_MASK (1 << 0) #define PCC_ERROR_MASK (1 << 2) #define MAX_CPC_REG_ENT 19 / CPPC specific PCC commands. / #define CMD_READ 0 #define CMD_WRITE 1 / Each register has the folowing format. / struct cpc_reg { u8 descriptor; u16 length; u8 space_id; u8 bit_width; u8 bit_offset; u8 access_width; u64 __iomem address; } __packed; / * Each entry in the CPC table is either * of type ACPI_TYPE_BUFFER or * ACPI_TYPE_INTEGER. / struct cpc_register_resource { acpi_object_type type; u64 __iomem sys_mem_vaddr; union { struct cpc_reg reg; u64 int_value; } cpc_entry; }; /* Container to hold the CPC details for each CPU / struct cpc_desc { int num_entries; int version; int cpu_id; int write_cmd_status; int write_cmd_id; struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; struct acpi_psd_package domain_info; struct kobject kobj; }; / These are indexes into the per-cpu cpc_regs[]. Order is important. / enum cppc_regs { HIGHEST_PERF, NOMINAL_PERF, LOW_NON_LINEAR_PERF, LOWEST_PERF, GUARANTEED_PERF, DESIRED_PERF, MIN_PERF, MAX_PERF, PERF_REDUC_TOLERANCE, TIME_WINDOW, CTR_WRAP_TIME, REFERENCE_CTR, DELIVERED_CTR, PERF_LIMITED, ENABLE, AUTO_SEL_ENABLE, AUTO_ACT_WINDOW, ENERGY_PERF, REFERENCE_PERF, }; / * Categorization of registers as described * in the ACPI v.5.1 spec. * XXX: Only filling up ones which are used by governors * today. / struct cppc_perf_caps { u32 guaranteed_perf; u32 highest_perf; u32 nominal_perf; u32 lowest_perf; u32 lowest_nonlinear_perf; }; struct cppc_perf_ctrls { u32 max_perf; u32 min_perf; u32 desired_perf; }; struct cppc_perf_fb_ctrs { u64 reference; u64 delivered; u64 reference_perf; u64 wraparound_time; }; / Per CPU container for runtime CPPC management. / struct cppc_cpudata { int cpu; struct cppc_perf_caps perf_caps; struct cppc_perf_ctrls perf_ctrls; struct cppc_perf_fb_ctrs perf_fb_ctrs; struct cpufreq_policy cur_policy; unsigned int shared_type; cpumask_var_t shared_cpu_map; }; extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls perf_ctrls); extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps caps); extern int acpi_get_psd_map(struct cppc_cpudata ); extern unsigned int cppc_get_transition_latency(int cpu); / Methods to interact with the PCC mailbox controller. / extern struct mbox_chan pcc_mbox_request_channel(struct mbox_client , unsigned int); extern int mbox_send_message(struct mbox_chan chan, void mssg); #endif / _CPPC_ACPI_H*/

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