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/*
* Copyright (c) 2016 MediaTek Inc.
* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License 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 _MTK_VPU_H
#define _MTK_VPU_H
#include <linux/platform_device.h>
/**
* VPU (video processor unit) is a tiny processor controlling video hardware
* related to video codec, scaling and color format converting.
* VPU interfaces with other blocks by share memory and interrupt.
**/
typedef void (*ipi_handler_t) (void *data,
unsigned int len,
void *priv);
/**
* enum ipi_id - the id of inter-processor interrupt
*
* @IPI_VPU_INIT: The interrupt from vpu is to notfiy kernel
VPU initialization completed.
IPI_VPU_INIT is sent from VPU when firmware is
loaded. AP doesn't need to send IPI_VPU_INIT
command to VPU.
For other IPI below, AP should send the request
to VPU to trigger the interrupt.
* @IPI_VENC_H264: The interrupt from vpu is to notify kernel to
handle H264 video encoder job, and vice versa.
* @IPI_VENC_VP8: The interrupt fro vpu is to notify kernel to
handle VP8 video encoder job,, and vice versa.
* @IPI_MAX: The maximum IPI number
*/
enum ipi_id {
IPI_VPU_INIT = 0,
IPI_VENC_H264,
IPI_VENC_VP8,
IPI_MAX,
};
/**
* enum rst_id - reset id to register reset function for VPU watchdog timeout
*
* @VPU_RST_ENC: encoder reset id
* @VPU_RST_MAX: maximum reset id
*/
enum rst_id {
VPU_RST_ENC,
VPU_RST_MAX,
};
/**
* vpu_ipi_register - register an ipi function
*
* @pdev: VPU platform device
* @id: IPI ID
* @handler: IPI handler
* @name: IPI name
* @priv: private data for IPI handler
*
* Register an ipi function to receive ipi interrupt from VPU.
*
* Return: Return 0 if ipi registers successfully, otherwise it is failed.
*/
int vpu_ipi_register(struct platform_device *pdev, enum ipi_id id,
ipi_handler_t handler, const char *name, void *priv);
/**
* vpu_ipi_send - send data from AP to vpu.
*
* @pdev: VPU platform device
* @id: IPI ID
* @buf: the data buffer
* @len: the data buffer length
*
* This function is thread-safe. When this function returns,
* VPU has received the data and starts the processing.
* When the processing completes, IPI handler registered
* by vpu_ipi_register will be called in interrupt context.
*
* Return: Return 0 if sending data successfully, otherwise it is failed.
**/
int vpu_ipi_send(struct platform_device *pdev,
enum ipi_id id, void *buf,
unsigned int len);
/**
* vpu_get_plat_device - get VPU's platform device
*
* @pdev: the platform device of the module requesting VPU platform
* device for using VPU API.
*
* Return: Return NULL if it is failed.
* otherwise it is VPU's platform device
**/
struct platform_device *vpu_get_plat_device(struct platform_device *pdev);
/**
* vpu_wdt_reg_handler - register a VPU watchdog handler
*
* @pdev: VPU platform device
* @vpu_wdt_reset_func: the callback reset function
* @private_data: the private data for reset function
* @rst_id: reset id
*
* Register a handler performing own tasks when vpu reset by watchdog
*
* Return: Return 0 if the handler is added successfully,
* otherwise it is failed.
*
**/
int vpu_wdt_reg_handler(struct platform_device *pdev,
void vpu_wdt_reset_func(void *),
void *priv, enum rst_id id);
/**
* vpu_get_venc_hw_capa - get video encoder hardware capability
*
* @pdev: VPU platform device
*
* Return: video encoder hardware capability
**/
unsigned int vpu_get_venc_hw_capa(struct platform_device *pdev);
/**
* vpu_load_firmware - download VPU firmware and boot it
*
* @pdev: VPU platform device
*
* Return: Return 0 if downloading firmware successfully,
* otherwise it is failed
**/
int vpu_load_firmware(struct platform_device *pdev);
/**
* vpu_mapping_dm_addr - Mapping DTCM/DMEM to kernel virtual address
*
* @pdev: VPU platform device
* @dmem_addr: VPU's data memory address
*
* Mapping the VPU's DTCM (Data Tightly-Coupled Memory) /
* DMEM (Data Extended Memory) memory address to
* kernel virtual address.
*
* Return: Return ERR_PTR(-EINVAL) if mapping failed,
* otherwise the mapped kernel virtual address
**/
void *vpu_mapping_dm_addr(struct platform_device *pdev,
u32 dtcm_dmem_addr);
#endif /* _MTK_VPU_H */
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