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/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _ARCH_ARM_MACH_MSM_BUS_H
#define _ARCH_ARM_MACH_MSM_BUS_H
#include <linux/types.h>
#include <linux/input.h>
#include <linux/platform_device.h>
/*
* Macros for clients to convert their data to ib and ab
* Ws : Time window over which to transfer the data in SECONDS
* Bs : Size of the data block in bytes
* Per : Recurrence period
* Tb : Throughput bandwidth to prevent stalling
* R : Ratio of actual bandwidth used to Tb
* Ib : Instantaneous bandwidth
* Ab : Arbitrated bandwidth
*
* IB_RECURRBLOCK and AB_RECURRBLOCK:
* These are used if the requirement is to transfer a
* recurring block of data over a known time window.
*
* IB_THROUGHPUTBW and AB_THROUGHPUTBW:
* These are used for CPU style masters. Here the requirement
* is to have minimum throughput bandwidth available to avoid
* stalling.
*/
#define IB_RECURRBLOCK(Ws, Bs) ((Ws) == 0 ? 0 : ((Bs)/(Ws)))
#define AB_RECURRBLOCK(Ws, Per) ((Ws) == 0 ? 0 : ((Bs)/(Per)))
#define IB_THROUGHPUTBW(Tb) (Tb)
#define AB_THROUGHPUTBW(Tb, R) ((Tb) * (R))
struct msm_bus_vectors {
int src; /* Master */
int dst; /* Slave */
uint64_t ab; /* Arbitrated bandwidth */
uint64_t ib; /* Instantaneous bandwidth */
};
struct msm_bus_paths {
int num_paths;
struct msm_bus_vectors *vectors;
};
struct msm_bus_scale_pdata {
struct msm_bus_paths *usecase;
int num_usecases;
const char *name;
/*
* If the active_only flag is set to 1, the BW request is applied
* only when at least one CPU is active (powered on). If the flag
* is set to 0, then the BW request is always applied irrespective
* of the CPU state.
*/
unsigned int active_only;
};
/* Scaling APIs */
/*
* This function returns a handle to the client. This should be used to
* call msm_bus_scale_client_update_request.
* The function returns 0 if bus driver is unable to register a client
*/
#if (defined(CONFIG_MSM_BUS_SCALING) || defined(CONFIG_BUS_TOPOLOGY_ADHOC))
int __init msm_bus_fabric_init_driver(void);
uint32_t msm_bus_scale_register_client(struct msm_bus_scale_pdata *pdata);
int msm_bus_scale_client_update_request(uint32_t cl, unsigned int index);
void msm_bus_scale_unregister_client(uint32_t cl);
/* AXI Port configuration APIs */
int msm_bus_axi_porthalt(int master_port);
int msm_bus_axi_portunhalt(int master_port);
#else
static inline int __init msm_bus_fabric_init_driver(void) { return 0; }
static inline uint32_t
msm_bus_scale_register_client(struct msm_bus_scale_pdata *pdata)
{
return 1;
}
static inline int
msm_bus_scale_client_update_request(uint32_t cl, unsigned int index)
{
return 0;
}
static inline void
msm_bus_scale_unregister_client(uint32_t cl)
{
}
static inline int msm_bus_axi_porthalt(int master_port)
{
return 0;
}
static inline int msm_bus_axi_portunhalt(int master_port)
{
return 0;
}
#endif
#if defined(CONFIG_OF) && defined(CONFIG_MSM_BUS_SCALING)
struct msm_bus_scale_pdata *msm_bus_pdata_from_node(
struct platform_device *pdev, struct device_node *of_node);
struct msm_bus_scale_pdata *msm_bus_cl_get_pdata(struct platform_device *pdev);
void msm_bus_cl_clear_pdata(struct msm_bus_scale_pdata *pdata);
#else
static inline struct msm_bus_scale_pdata
*msm_bus_cl_get_pdata(struct platform_device *pdev)
{
return NULL;
}
static inline struct msm_bus_scale_pdata *msm_bus_pdata_from_node(
struct platform_device *pdev, struct device_node *of_node)
{
return NULL;
}
static inline void msm_bus_cl_clear_pdata(struct msm_bus_scale_pdata *pdata)
{
}
#endif
#endif /*_ARCH_ARM_MACH_MSM_BUS_H*/
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