Re: [PATCH v4 2/8] [media] VPU: mediatek: support Mediatek VPU

From: andrew-ct chen
Date: Tue Feb 16 2016 - 04:36:44 EST

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On Mon, 2016-02-15 at 21:59 +0800, Wu-Cheng Li (æåè) wrote:
> On Thu, Feb 4, 2016 at 7:34 PM, Tiffany Lin <tiffany.lin@xxxxxxxxxxxx> wrote:
> > The VPU driver for hw video codec embedded in Mediatek's MT8173 SOCs.
> > It is able to handle video decoding/encoding of in a range of formats.
> > The driver provides with VPU firmware download, memory management and
> > the communication interface between CPU and VPU.
> > For VPU initialization, it will create virtual memory for CPU access and
> > IOMMU address for vcodec hw device access. When a decode/encode instance
> > opens a device node, vpu driver will download vpu firmware to the device.
> > A decode/encode instant will decode/encode a frame using VPU
> > interface to interrupt vpu to handle decoding/encoding jobs.
> >
> > Signed-off-by: Andrew-CT Chen <andrew-ct.chen@xxxxxxxxxxxx>
> > Signed-off-by: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
> > ---
> > drivers/media/platform/Kconfig | 9 +
> > drivers/media/platform/Makefile | 2 +
> > drivers/media/platform/mtk-vpu/Makefile | 1 +
> > drivers/media/platform/mtk-vpu/mtk_vpu.c | 994 ++++++++++++++++++++++++++++++
> > drivers/media/platform/mtk-vpu/mtk_vpu.h | 167 +++++
> > 5 files changed, 1173 insertions(+)
> > create mode 100644 drivers/media/platform/mtk-vpu/Makefile
> > create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.c
> > create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.h
> >
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index ccbc974..ba812d6 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -148,6 +148,15 @@ config VIDEO_CODA
> > Coda is a range of video codec IPs that supports
> > H.264, MPEG-4, and other video formats.
> >
> > +config VIDEO_MEDIATEK_VPU
> > + tristate "Mediatek Video Processor Unit"
> > + depends on VIDEO_DEV && VIDEO_V4L2 && ARCH_MEDIATEK
> > + ---help---
> > + This driver provides downloading VPU firmware and
> > + communicating with VPU. This driver for hw video
> > + codec embedded in new Mediatek's SOCs. It is able
> > + to handle video decoding/encoding in a range of formats.
> > +
> > config VIDEO_MEM2MEM_DEINTERLACE
> > tristate "Deinterlace support"
> > depends on VIDEO_DEV && VIDEO_V4L2 && DMA_ENGINE
> > diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> > index efa0295..e5b19c6 100644
> > --- a/drivers/media/platform/Makefile
> > +++ b/drivers/media/platform/Makefile
> > @@ -55,3 +55,5 @@ obj-$(CONFIG_VIDEO_AM437X_VPFE) += am437x/
> > obj-$(CONFIG_VIDEO_XILINX) += xilinx/
> >
> > ccflags-y += -I$(srctree)/drivers/media/i2c
> > +
> > +obj-$(CONFIG_VIDEO_MEDIATEK_VPU) += mtk-vpu/
> > diff --git a/drivers/media/platform/mtk-vpu/Makefile b/drivers/media/platform/mtk-vpu/Makefile
> > new file mode 100644
> > index 0000000..d890a66
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vpu/Makefile
> > @@ -0,0 +1 @@
> > +obj-y += mtk_vpu.o
> > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > new file mode 100644
> > index 0000000..f54fd89
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > @@ -0,0 +1,994 @@
> > +/*
> > +* Copyright (c) 2015 MediaTek Inc.
> > +* Author: Andrew-CT Chen <andrew-ct.chen@xxxxxxxxxxxx>
> > +*
> > +* 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.
> > +*/
> > +#include <linux/bootmem.h>
> > +#include <linux/clk.h>
> > +#include <linux/debugfs.h>
> > +#include <linux/firmware.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/iommu.h>
> > +#include <linux/module.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/of_reserved_mem.h>
> > +#include <linux/sched.h>
> > +#include <linux/sizes.h>
> > +
> > +#include "mtk_vpu.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.
> > + **/
> > +
> > +#define INIT_TIMEOUT_MS 2000U
> > +#define IPI_TIMEOUT_MS 2000U
> > +#define VPU_FW_VER_LEN 16
> > +
> > +/* maximum program/data TCM (Tightly-Coupled Memory) size */
> > +#define VPU_PTCM_SIZE (96 * SZ_1K)
> > +#define VPU_DTCM_SIZE (32 * SZ_1K)
> > +/* the offset to get data tcm address */
> > +#define VPU_DTCM_OFFSET 0x18000UL
> > +/* daynamic allocated maximum extended memory size */
> > +#define VPU_EXT_P_SIZE SZ_1M
> > +#define VPU_EXT_D_SIZE SZ_4M
> > +/* maximum binary firmware size */
> > +#define VPU_P_FW_SIZE (VPU_PTCM_SIZE + VPU_EXT_P_SIZE)
> > +#define VPU_D_FW_SIZE (VPU_DTCM_SIZE + VPU_EXT_D_SIZE)
> > +/* the size of share buffer between Host and VPU */
> > +#define SHARE_BUF_SIZE 48
> > +
> > +/* binary firmware name */
> > +#define VPU_P_FW "vpu_p.bin"
> > +#define VPU_D_FW "vpu_d.bin"
> > +
> > +#define VPU_RESET 0x0
> > +#define VPU_TCM_CFG 0x0008
> > +#define VPU_PMEM_EXT0_ADDR 0x000C
> > +#define VPU_PMEM_EXT1_ADDR 0x0010
> > +#define VPU_TO_HOST 0x001C
> > +#define VPU_DMEM_EXT0_ADDR 0x0014
> > +#define VPU_DMEM_EXT1_ADDR 0x0018
> > +#define HOST_TO_VPU 0x0024
> > +#define VPU_PC_REG 0x0060
> > +#define VPU_WDT_REG 0x0084
> > +
> > +/* vpu inter-processor communication interrupt */
> > +#define VPU_IPC_INT BIT(8)
> > +
> > +/**
> > + * enum vpu_fw_type - VPU firmware type
> > + *
> > + * @P_FW: program firmware
> > + * @D_FW: data firmware
> > + *
> > + */
> > +enum vpu_fw_type {
> > + P_FW,
> > + D_FW,
> > +};
> > +
> > +/**
> > + * struct vpu_mem - VPU extended program/data memory information
> > + *
> > + * @va: the kernel virtual memory address of VPU extended memory
> > + * @pa: the physical memory address of VPU extended memory
> This should be device memory address? If yes, s/physical/device/ and
> s/pa/dma_addr/.

It's really a physical memory since vpu is not attached to IOMMU.It
should be s/dma_addr_t/phys_addr_t for the data type.Thanks.

> > + *
> > + */
> > +struct vpu_mem {
> > + void *va;
> > + dma_addr_t pa;
> > +};
> > +
> > +/**
> > + * struct vpu_regs - VPU TCM and configuration registers
> > + *
> > + * @tcm: the register for VPU Tightly-Coupled Memory
> > + * @cfg: the register for VPU configuration
> > + * @irq: the irq number for VPU interrupt
> > + */
> > +struct vpu_regs {
> > + void __iomem *tcm;
> > + void __iomem *cfg;
> > + int irq;
> > +};
> > +
> > +/**
> > + * struct vpu_wdt_handler - VPU watchdog reset handler
> > + *
> > + * @reset_func: reset handler
> > + * @priv: private data
> > + */
> > +struct vpu_wdt_handler {
> > + void (*reset_func)(void *);
> > + void *priv;
> > +};
> > +
> > +/**
> > + * struct vpu_wdt - VPU watchdog workqueue
> > + *
> > + * @handler: VPU watchdog reset handler
> > + * @ws: workstruct for VPU watchdog
> > + * @wq: workqueue for VPU watchdog
> > + */
> > +struct vpu_wdt {
> > + struct vpu_wdt_handler handler[VPU_RST_MAX];
> > + struct work_struct ws;
> > + struct workqueue_struct *wq;
> > +};
> > +
> > +/**
> > + * struct vpu_run - VPU initialization status
> > + *
> > + * @signaled: the signal of vpu initialization completed
> > + * @fw_ver: VPU firmware version
> > + * @enc_capability: encoder capability
> We should document the meaning of the bit used. Since no bit is used
> by the codec driver, document this is not used for now and the value
> is reserved for future use.

This is not used for now. I will document this in next version. Thanks.

> > + * @wq: wait queue for VPU initialization status
> > + */
> > +struct vpu_run {
> > + u32 signaled;
> > + char fw_ver[VPU_FW_VER_LEN];
> > + unsigned int enc_capability;
> > + wait_queue_head_t wq;
> > +};
> > +
> > +/**
> > + * struct vpu_ipi_desc - VPU IPI descriptor
> > + *
> > + * @handler: IPI handler
> > + * @name: the name of IPI handler
> > + * @priv: the private data of IPI handler
> > + */
> > +struct vpu_ipi_desc {
> > + ipi_handler_t handler;
> > + const char *name;
> > + void *priv;
> > +};
> > +
> > +/**
> > + * struct share_obj - DTCM (Data Tightly-Coupled Memory) buffer shared with
> > + * AP and VPU
> > + *
> > + * @id: IPI id
> > + * @len: share buffer length
> > + * @share_buf: share buffer data
> > + */
> > +struct share_obj {
> > + s32 id;
> > + u32 len;
> > + unsigned char share_buf[SHARE_BUF_SIZE];
> > +};
> > +
> > +/**
> > + * struct mtk_vpu - vpu driver data
> > + * @extmem: VPU extended memory information
> > + * @reg: VPU TCM and configuration registers
> > + * @run: VPU initialization status
> > + * @ipi_desc: VPU IPI descriptor
> > + * @recv_buf: VPU DTCM share buffer for receiving. The
> > + * receive buffer is only accessed in interrupt context.
> > + * @send_buf: VPU DTCM share buffer for sending
> > + * @dev: VPU struct device
> > + * @clk: VPU clock on/off
> > + * @enable_4GB: VPU 4GB mode on/off
> > + * @vpu_mutex: protect mtk_vpu (except recv_buf) and ensure only
> > + * one client to use VPU service at a time. For example,
> > + * suppose a client is using VPU to decode VP8.
> > + * If the other client wants to encode VP8,
> > + * it has to wait until VP8 decode completes.
> > + * @wdt_refcnt WDT reference count to make sure the watchdog can be
> > + * disabled if no other client is using VPU service
> > + * @ipi_ack_signaled: The ACKs for registered IPI function sending
> > + * interrupt to VPU
> s/ipi_ack_signaled/ipi_id_ack/. Move to after |ack_wq| to be
> consistent with the order of variable declaration.

I will change this in next version. Thanks.

> > + * @ack_wq: The wait queue for each codec and mdp. When sleeping
> > + * processes wake up, they will check the condition
> > + * "ipi_ack_signaled" to run the corresponding action or
> > + * go back to sleep.
> > + *
> > + */
> > +struct mtk_vpu {
> > + struct vpu_mem extmem[2];
> > + struct vpu_regs reg;
> > + struct vpu_run run;
> > + struct vpu_wdt wdt;
> > + struct vpu_ipi_desc ipi_desc[IPI_MAX];
> > + struct share_obj *recv_buf;
> > + struct share_obj *send_buf;
> > + struct device *dev;
> > + struct clk *clk;
> > + bool enable_4GB;
> > + struct mutex vpu_mutex; /* for protecting vpu data data structure */
> Remove the comment here. It should be documented in function comment above

It will get message "CHECK" from checkpatch script if removing this
comment.

> .
> > + atomic_t wdt_refcnt;
> > + wait_queue_head_t ack_wq;
> > + bool ipi_id_ack[IPI_MAX];
> > +};
> > +
> > +static inline void vpu_cfg_writel(struct mtk_vpu *vpu, u32 val, u32 offset)
> > +{
> > + writel(val, vpu->reg.cfg + offset);
> > +}
> > +
> > +static inline u32 vpu_cfg_readl(struct mtk_vpu *vpu, u32 offset)
> > +{
> > + return readl(vpu->reg.cfg + offset);
> > +}
> > +
> > +static inline bool vpu_running(struct mtk_vpu *vpu)
> > +{
> > + return vpu_cfg_readl(vpu, VPU_RESET) & BIT(0);
> > +}
> > +
> > +void vpu_clock_disable(struct mtk_vpu *vpu)
> > +{
> > + /* Disable VPU watchdog */
> > + if (atomic_dec_and_test(&vpu->wdt_refcnt))
> Checking wdt_refcnt and doing vpu_cfg_writel should be done
> atomically. For example, if vpu_clock_enable is called after
> atomic_dec_and_test(&vpu->wdt_refcnt) and before vpu_cfg_writel(...),
> the state of watchdog could be wrong. Adding a spinlock to protect
> wdt_refcnt and vpu_cfg_writel together. Then wdt_refcnt doesn't need
> to be atomic_t.

I would use mutex to protect this since this only be called in process
context. I will change this in next version. Thanks.

> > + vpu_cfg_writel(vpu,
> > + vpu_cfg_readl(vpu, VPU_WDT_REG) & ~(1L << 31),
> > + VPU_WDT_REG);
> > +
> > + clk_disable(vpu->clk);
> > +}
> > +
> > +int vpu_clock_enable(struct mtk_vpu *vpu)
> > +{
> > + int ret;
> > +
> > + ret = clk_enable(vpu->clk);
> > + if (ret)
> > + return ret;
> > + /* Enable VPU watchdog */
> > + if (!atomic_read(&vpu->wdt_refcnt))
> Do we need to enable the watchdog other than vpu_ipi_send? The only
> place that AP waits for VPU is in vpu_ipi_send. Right? If yes, can we
> just enable and disable the watchdog in vpu_ipi_send?

Watchdog also should be enabled during driver initialization and
firmware download.

> > + vpu_cfg_writel(vpu,
> > + vpu_cfg_readl(vpu, VPU_WDT_REG) | (1L << 31),
> > + VPU_WDT_REG);
> > +
> > + atomic_inc(&vpu->wdt_refcnt);
> Same above. atomic_read, vpu_cfg_writel, and atomic_inc should be done
> atomically.

I will change this in next version. Thanks.

> > +
> > + return ret;
> > +}
> > +
> > +int vpu_ipi_register(struct platform_device *pdev,
> > + enum ipi_id id, ipi_handler_t handler,
> > + const char *name, void *priv)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > + struct vpu_ipi_desc *ipi_desc;
> > +
> > + if (!vpu) {
> > + dev_err(&pdev->dev, "vpu device in not ready\n");
> > + return -EPROBE_DEFER;
> > + }
> > +
> > + if (id < IPI_MAX && handler) {
> Check if id >= 0 because type of enum is implementation dependent.

I will change this in next version. Thanks.

> > + ipi_desc = vpu->ipi_desc;
> > + ipi_desc[id].name = name;
> > + ipi_desc[id].handler = handler;
> > + ipi_desc[id].priv = priv;
> > + return 0;
> > + }
> > +
> > + dev_err(&pdev->dev, "register vpu ipi with invalid arguments\n");
> print id

I will change this in next version. Thanks.

> > + return -EINVAL;
> > +}
> > +
> > +int vpu_ipi_send(struct platform_device *pdev,
> > + enum ipi_id id, void *buf,
> > + unsigned int len)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > + struct share_obj *send_obj = vpu->send_buf;
> > + unsigned long timeout;
> > + int ret = 0;
> > +
> > + if (id <= IPI_VPU_INIT || id >= IPI_MAX ||
> > + len > sizeof(send_obj->share_buf) || !buf) {
> > + dev_err(vpu->dev, "failed to send ipi message\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> > + dev_err(vpu->dev, "failed to enable vpu clock\n");
> > + return ret;
> > + }
> > + if (!vpu_running(vpu)) {
> > + dev_err(vpu->dev, "vpu_ipi_send: VPU is not running\n");
> > + ret = -EINVAL;
> > + goto clock_disable;
> > + }
> > +
> > + mutex_lock(&vpu->vpu_mutex);
> > +
> > + /* Wait until VPU receives the last command */
> > + timeout = jiffies + msecs_to_jiffies(IPI_TIMEOUT_MS);
> > + do {
> > + if (time_after(jiffies, timeout)) {
> > + dev_err(vpu->dev, "vpu_ipi_send: IPI timeout!\n");
> > + ret = -EIO;
> > + goto mut_unlock;
> > + }
> > + } while (vpu_cfg_readl(vpu, HOST_TO_VPU));
> > +
> > + memcpy((void *)send_obj->share_buf, buf, len);
> > + send_obj->len = len;
> > + send_obj->id = id;
> > +
> > + vpu->ipi_id_ack[id] = false;
> > + /* send the command to VPU */
> > + vpu_cfg_writel(vpu, 0x1, HOST_TO_VPU);
> > +
> > + mutex_unlock(&vpu->vpu_mutex);
> > +
> > + /* wait for VPU's ACK */
> > + timeout = msecs_to_jiffies(IPI_TIMEOUT_MS);
> > + ret = wait_event_interruptible_timeout(vpu->ack_wq,
> > + vpu->ipi_id_ack[id], timeout);
> > + vpu->ipi_id_ack[id] = false;
> > + if (ret == 0) {
> > + dev_err(vpu->dev, "vpu ipi %d ack time out !", id);
> > + ret = -EIO;
> > + goto clock_disable;
> > + } else if (-ERESTARTSYS == ret) {
> > + dev_err(vpu->dev, "vpu ipi %d ack wait interrupted by a signal",
> > + id);
> > + ret = -ERESTARTSYS;
> > + goto clock_disable;
> > + }
> > + vpu_clock_disable(vpu);
> > +
> > + return 0;
> > +
> > +mut_unlock:
> > + vpu->ipi_id_ack[id] = false;
> I don't see why we need to set it to false here. Remove if not needed.
I will remove this in next version. Thanks.
> > + mutex_unlock(&vpu->vpu_mutex);
> > +clock_disable:
> > + vpu_clock_disable(vpu);
> > +
> > + return ret;
> > +}
> > +
> > +static void vpu_wdt_reset_func(struct work_struct *ws)
> > +{
> > + struct vpu_wdt *wdt = container_of(ws, struct vpu_wdt, ws);
> > + struct mtk_vpu *vpu = container_of(wdt, struct mtk_vpu, wdt);
> > + struct vpu_wdt_handler *handler = wdt->handler;
> > + int index, ret;
> > +
> > + dev_info(vpu->dev, "vpu reset\n");
> > + mutex_lock(&vpu->vpu_mutex);
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> This is missing mutex_unlock. Move mutex_lock right before
> vpu_cfg_writel(vpu, 0x0, VPU_RESET);. So we don't need to unlock when
> vpu_clock_enable fails.

I will change this in next version. Thanks.

> > + dev_err(vpu->dev, "[VPU] wdt enables clock failed %d\n", ret);
> > + return;
> > + }
> > + vpu_cfg_writel(vpu, 0x0, VPU_RESET);
> > + vpu_clock_disable(vpu);
> > + mutex_unlock(&vpu->vpu_mutex);
> > +
> > + for (index = 0; index < VPU_RST_MAX; index++) {
> > + if (handler[index].reset_func) {
> > + handler[index].reset_func(handler[index].priv);
> > + dev_dbg(vpu->dev, "wdt handler func %d\n", index);
> > + }
> > + }
> > +}
> > +
> > +int vpu_wdt_reg_handler(struct platform_device *pdev,
> > + void wdt_reset(void *),
> > + void *priv, enum rst_id id)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > + struct vpu_wdt_handler *handler = vpu->wdt.handler;
> > +
> > + if (!vpu) {
> > + dev_err(vpu->dev, "vpu device in not ready\n");
> > + return -EPROBE_DEFER;
> > + }
> > +
> > + if (id < VPU_RST_MAX && wdt_reset != NULL) {
> Check id >= 0

I will change this in next version. Thanks.

> > + dev_dbg(vpu->dev, "wdt register id %d\n", id);
> > + mutex_lock(&vpu->vpu_mutex);
> > + handler[id].reset_func = wdt_reset;
> > + handler[id].priv = priv;
> > + mutex_unlock(&vpu->vpu_mutex);
> > + return 0;
> > + }
> > +
> > + dev_err(vpu->dev, "register vpu wdt handler failed\n");
> > + return -EINVAL;
> > +}
> > +
> > +unsigned int vpu_get_venc_hw_capa(struct platform_device *pdev)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > +
> > + return vpu->run.enc_capability;
> > +}
> > +
> > +void *vpu_mapping_dm_addr(struct platform_device *pdev,
> > + u32 dtcm_dmem_addr)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > +
> > + if (!dtcm_dmem_addr ||
> > + (dtcm_dmem_addr > (VPU_DTCM_SIZE + VPU_EXT_D_SIZE))) {
> > + dev_err(vpu->dev, "invalid virtual data memory address\n");
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + if (dtcm_dmem_addr < VPU_DTCM_SIZE)
> > + return dtcm_dmem_addr + vpu->reg.tcm + VPU_DTCM_OFFSET;
> > +
> > + return vpu->extmem[D_FW].va + (dtcm_dmem_addr - VPU_DTCM_SIZE);
> > +}
> > +
> > +struct platform_device *vpu_get_plat_device(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *vpu_node;
> > + struct platform_device *vpu_pdev;
> > +
> > + vpu_node = of_parse_phandle(dev->of_node, "mediatek,vpu", 0);
> > + if (!vpu_node) {
> > + dev_err(dev, "can't get vpu node\n");
> > + return NULL;
> > + }
> > +
> > + vpu_pdev = of_find_device_by_node(vpu_node);
> > + if (WARN_ON(!vpu_pdev)) {
> > + dev_err(dev, "vpu pdev failed\n");
> > + of_node_put(vpu_node);
> > + return NULL;
> > + }
> > +
> > + return vpu_pdev;
> > +}
> > +
> > +/* load vpu program/data memory */
> > +static int load_requested_vpu(struct mtk_vpu *vpu,
> > + const struct firmware *vpu_fw,
> > + u8 fw_type)
> > +{
> > + size_t tcm_size = fw_type ? VPU_DTCM_SIZE : VPU_PTCM_SIZE;
> > + size_t fw_size = fw_type ? VPU_D_FW_SIZE : VPU_P_FW_SIZE;
> > + char *fw_name = fw_type ? VPU_D_FW : VPU_P_FW;
> > + size_t dl_size = 0;
> > + size_t extra_fw_size = 0;
> > + void *dest;
> > + int ret;
> > +
> > + ret = request_firmware(&vpu_fw, fw_name, vpu->dev);
> > + if (ret < 0) {
> > + dev_err(vpu->dev, "Failed to load %s, %d\n", fw_name, ret);
> > + return ret;
> > + }
> > + dl_size = vpu_fw->size;
> > + if (dl_size > fw_size) {
> > + dev_err(vpu->dev, "fw %s size %zu is abnormal\n", fw_name,
> > + dl_size);
> > + release_firmware(vpu_fw);
> > + return -EFBIG;
> > + }
> > + dev_dbg(vpu->dev, "Downloaded fw %s size: %zu.\n",
> > + fw_name,
> > + dl_size);
> > + /* reset VPU */
> > + vpu_cfg_writel(vpu, 0x0, VPU_RESET);
> > +
> > + /* handle extended firmware size */
> > + if (dl_size > tcm_size) {
> > + dev_dbg(vpu->dev, "fw size %lx > limited fw size %lx\n",
> > + dl_size, tcm_size);
> > + extra_fw_size = dl_size - tcm_size;
> > + dev_dbg(vpu->dev, "extra_fw_size %lx\n", extra_fw_size);
> > + dl_size = tcm_size;
> > + }
> > + dest = vpu->reg.tcm;
> > + if (fw_type == D_FW)
> > + dest += VPU_DTCM_OFFSET;
> > + memcpy(dest, vpu_fw->data, dl_size);
> > + /* download to extended memory if need */
> > + if (extra_fw_size > 0) {
> > + dest = vpu->extmem[fw_type].va;
> > + dev_dbg(vpu->dev, "download extended memory type %x\n",
> > + fw_type);
> > + memcpy(dest, vpu_fw->data + tcm_size, extra_fw_size);
> > + }
> > +
> > + release_firmware(vpu_fw);
> > +
> > + return 0;
> > +}
> > +
> > +int vpu_load_firmware(struct platform_device *pdev)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > + struct device *dev = &pdev->dev;
> > + struct vpu_run *run = &vpu->run;
> > + const struct firmware *vpu_fw;
> > + int ret;
> > +
> > + if (!pdev) {
> > + dev_err(dev, "VPU platform device is invalid\n");
> > + return -EINVAL;
> > + }
> > +
> > + mutex_lock(&vpu->vpu_mutex);
> > +
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> > + dev_err(dev, "enable clock failed %d\n", ret);
> > + goto OUT_LOAD_FW;
> > + }
> > +
> > + if (vpu_running(vpu)) {
> > + vpu_clock_disable(vpu);
> > + mutex_unlock(&vpu->vpu_mutex);
> > + dev_warn(dev, "vpu is running already\n");
> > + return 0;
> > + }
> > +
> > + run->signaled = false;
> > + dev_dbg(vpu->dev, "firmware request\n");
> > + /* Downloading program firmware to device*/
> > + ret = load_requested_vpu(vpu, vpu_fw, P_FW);
> > + if (ret < 0) {
> > + dev_err(dev, "Failed to request %s, %d\n", VPU_P_FW, ret);
> > + goto OUT_LOAD_FW;
> > + }
> > +
> > + /* Downloading data firmware to device */
> > + ret = load_requested_vpu(vpu, vpu_fw, D_FW);
> > + if (ret < 0) {
> > + dev_err(dev, "Failed to request %s, %d\n", VPU_D_FW, ret);
> > + goto OUT_LOAD_FW;
> > + }
> > +
> > + /* boot up vpu */
> > + vpu_cfg_writel(vpu, 0x1, VPU_RESET);
> > +
> > + ret = wait_event_interruptible_timeout(run->wq,
> > + run->signaled,
> > + msecs_to_jiffies(INIT_TIMEOUT_MS)
> > + );
> > + if (ret == 0) {
> > + ret = -ETIME;
> > + dev_err(dev, "wait vpu initialization timout!\n");
> > + goto OUT_LOAD_FW;
> > + } else if (-ERESTARTSYS == ret) {
> > + dev_err(dev, "wait vpu interrupted by a signal!\n");
> > + goto OUT_LOAD_FW;
> > + }
> > +
> > + ret = 0;
> > + dev_info(dev, "vpu is ready. Fw version %s\n", run->fw_ver);
> > +
> > +OUT_LOAD_FW:
> > + vpu_clock_disable(vpu);
> > + mutex_unlock(&vpu->vpu_mutex);
> > +
> > + return ret;
> > +}
> > +
> > +int vpu_compare_version(struct platform_device *pdev,
> > + const char *expected_version)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > + int cur_major, cur_minor, cur_build, cur_rel, cur_ver_num;
> > + int major, minor, build, rel, ver_num;
> > + char *cur_version = vpu->run.fw_ver;
> > +
> > + cur_ver_num = sscanf(cur_version, "%d.%d.%d-rc%d",
> > + &cur_major, &cur_minor, &cur_build, &cur_rel);
> > + if (cur_ver_num < 3)
> > + return -1;
> > + ver_num = sscanf(expected_version, "%d.%d.%d-rc%d",
> > + &major, &minor, &build, &rel);
> > + if (ver_num < 3)
> > + return -1;
> > +
> > + if (cur_major < major)
> > + return -1;
> > + if (cur_major > major)
> > + return 1;
> > +
> > + if (cur_minor < minor)
> > + return -1;
> > + if (cur_minor > minor)
> > + return 1;
> > +
> > + if (cur_build < build)
> > + return -1;
> > + if (cur_build > build)
> > + return 1;
> > +
> > + if (cur_ver_num < ver_num)
> > + return -1;
> > + if (cur_ver_num > ver_num)
> > + return 1;
> > +
> > + if (ver_num > 3) {
> > + if (cur_rel < rel)
> > + return -1;
> > + if (cur_rel > rel)
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void vpu_init_ipi_handler(void *data, unsigned int len, void *priv)
> > +{
> > + struct mtk_vpu *vpu = (struct mtk_vpu *)priv;
> > + struct vpu_run *run = (struct vpu_run *)data;
> > +
> > + vpu->run.signaled = run->signaled;
> > + strncpy(vpu->run.fw_ver, run->fw_ver, VPU_FW_VER_LEN);
> > + vpu->run.enc_capability = run->enc_capability;
> > + wake_up_interruptible(&vpu->run.wq);
> > +}
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +static int vpu_debug_open(struct inode *inode, struct file *file)
> > +{
> > + file->private_data = inode->i_private;
> > + return 0;
> > +}
> > +
> > +static ssize_t vpu_debug_read(struct file *file, char __user *user_buf,
> > + size_t count, loff_t *ppos)
> > +{
> > + char buf[256];
> > + unsigned int len;
> > + unsigned int running, pc, vpu_to_host, host_to_vpu, wdt;
> > + int ret;
> > + struct device *dev = file->private_data;
> > + struct mtk_vpu *vpu = dev_get_drvdata(dev);
> > +
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> > + dev_err(vpu->dev, "[VPU] enable clock failed %d\n", ret);
> > + return 0;
> > + }
> > +
> > + /* vpu register status */
> > + running = vpu_running(vpu);
> > + pc = vpu_cfg_readl(vpu, VPU_PC_REG);
> > + wdt = vpu_cfg_readl(vpu, VPU_WDT_REG);
> > + host_to_vpu = vpu_cfg_readl(vpu, HOST_TO_VPU);
> > + vpu_to_host = vpu_cfg_readl(vpu, VPU_TO_HOST);
> > + vpu_clock_disable(vpu);
> > +
> > + if (running) {
> > + len = sprintf(buf, "VPU is running\n\n"
> > + "FW Version: %s\n"
> > + "PC: 0x%x\n"
> > + "WDT: 0x%x\n"
> > + "Host to VPU: 0x%x\n"
> > + "VPU to Host: 0x%x\n",
> > + vpu->run.fw_ver, pc, wdt,
> > + host_to_vpu, vpu_to_host);
> > + } else {
> > + len = sprintf(buf, "VPU not running\n");
> > + }
> > +
> > + return simple_read_from_buffer(user_buf, count, ppos, buf, len);
> > +}
> > +
> > +static const struct file_operations vpu_debug_fops = {
> > + .open = vpu_debug_open,
> > + .read = vpu_debug_read,
> > +};
> > +#endif /* CONFIG_DEBUG_FS */
> > +
> > +static void vpu_free_ext_mem(struct mtk_vpu *vpu, u8 fw_type)
> > +{
> > + struct device *dev = vpu->dev;
> > + size_t fw_ext_size = fw_type ? VPU_EXT_D_SIZE : VPU_EXT_P_SIZE;
> > +
> > + dma_free_coherent(dev, fw_ext_size, vpu->extmem[fw_type].va,
> > + vpu->extmem[fw_type].pa);
> > +}
> > +
> > +static int vpu_alloc_ext_mem(struct mtk_vpu *vpu, u32 fw_type)
> > +{
> > + struct device *dev = vpu->dev;
> > + size_t fw_ext_size = fw_type ? VPU_EXT_D_SIZE : VPU_EXT_P_SIZE;
> > + u32 vpu_ext_mem0 = fw_type ? VPU_DMEM_EXT0_ADDR : VPU_PMEM_EXT0_ADDR;
> > + u32 vpu_ext_mem1 = fw_type ? VPU_DMEM_EXT1_ADDR : VPU_PMEM_EXT1_ADDR;
> > + u32 offset_4gb = vpu->enable_4GB ? 0x40000000 : 0;
> > +
> > + vpu->extmem[fw_type].va = dma_alloc_coherent(dev,
> > + fw_ext_size,
> > + &vpu->extmem[fw_type].pa,
> > + GFP_KERNEL);
> > + if (!vpu->extmem[fw_type].va) {
> > + dev_err(dev, "Failed to allocate the extended program memory\n");
> > + return PTR_ERR(vpu->extmem[fw_type].va);
> > + }
> > +
> > + /* Disable extend0. Enable extend1 */
> > + vpu_cfg_writel(vpu, 0x1, vpu_ext_mem0);
> > + vpu_cfg_writel(vpu, (vpu->extmem[fw_type].pa & 0xFFFFF000) + offset_4gb,
> > + vpu_ext_mem1);
> > +
> > + dev_info(dev, "%s extend memory phy=0x%llx virt=0x%p\n",
> > + fw_type ? "Data" : "Program",
> > + (unsigned long long)vpu->extmem[fw_type].pa,
> > + vpu->extmem[fw_type].va);
> > +
> > + return 0;
> > +}
> > +
> > +static void vpu_ipi_handler(struct mtk_vpu *vpu)
> > +{
> > + struct share_obj *rcv_obj = vpu->recv_buf;
> > + struct vpu_ipi_desc *ipi_desc = vpu->ipi_desc;
> > +
> > + if (rcv_obj->id < IPI_MAX && ipi_desc[rcv_obj->id].handler) {
> check rcv_obj->id >= 0

The variable type of "rcv_obj->id" is u32. I think we don't need to
check this range.Thanks.

> > + ipi_desc[rcv_obj->id].handler(rcv_obj->share_buf,
> > + rcv_obj->len,
> > + ipi_desc[rcv_obj->id].priv);
> > + if (rcv_obj->id > IPI_VPU_INIT) {
> > + vpu->ipi_id_ack[rcv_obj->id] = true;
> > + wake_up_interruptible(&vpu->ack_wq);
> > + }
> > + } else {
> > + dev_err(vpu->dev, "No such ipi id = %d\n", rcv_obj->id);
> > + }
> > +}
> > +
> > +static int vpu_ipi_init(struct mtk_vpu *vpu)
> > +{
> > + /* Disable VPU to host interrupt */
> > + vpu_cfg_writel(vpu, 0x0, VPU_TO_HOST);
> > +
> > + /* shared buffer initialization */
> > + vpu->recv_buf = (struct share_obj *)(vpu->reg.tcm + VPU_DTCM_OFFSET);
> > + vpu->send_buf = vpu->recv_buf + 1;
> > + memset(vpu->recv_buf, 0, sizeof(struct share_obj));
> > + memset(vpu->send_buf, 0, sizeof(struct share_obj));
> > + mutex_init(&vpu->vpu_mutex);
> > +
> > + return 0;
> > +}
> > +
> > +static irqreturn_t vpu_irq_handler(int irq, void *priv)
> > +{
> > + struct mtk_vpu *vpu = priv;
> > + u32 vpu_to_host;
> > + int ret;
> > +
> > + /*
> > + * Clock should have been enabled already.
> > + * Enable again in case vpu_ipi_send times out
> > + * and has disabled the clock.
> > + */
> > + ret = clk_enable(vpu->clk);
> > + if (ret) {
> > + dev_err(vpu->dev, "[VPU] enable clock failed %d\n", ret);
> > + return IRQ_NONE;
> > + }
> > + vpu_to_host = vpu_cfg_readl(vpu, VPU_TO_HOST);
> > + if (vpu_to_host & VPU_IPC_INT) {
> > + vpu_ipi_handler(vpu);
> > + } else {
> > + dev_err(vpu->dev, "vpu watchdog timeout! 0x%x", vpu_to_host);
> > + if (vpu->wdt.wq)
> Remove. mtk_vpu_probe makes sure wdt.wq is not NULL.
I will change this in next version. Thanks.

> > + queue_work(vpu->wdt.wq, &vpu->wdt.ws);
> > + }
> > +
> > + /* VPU won't send another interrupt until we set VPU_TO_HOST to 0. */
> > + vpu_cfg_writel(vpu, 0x0, VPU_TO_HOST);
> > + clk_disable(vpu->clk);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +static struct dentry *vpu_debugfs;
> > +#endif
> > +static int mtk_vpu_probe(struct platform_device *pdev)
> > +{
> > + struct mtk_vpu *vpu;
> > + struct device *dev;
> > + struct resource *res;
> > + int ret = 0;
> > +
> > + dev_dbg(&pdev->dev, "initialization\n");
> > +
> > + dev = &pdev->dev;
> > + vpu = devm_kzalloc(dev, sizeof(*vpu), GFP_KERNEL);
> > + if (!vpu)
> > + return -ENOMEM;
> > +
> > + vpu->dev = &pdev->dev;
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcm");
> > + vpu->reg.tcm = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(vpu->reg.tcm)) {
> > + dev_err(dev, "devm_ioremap_resource vpu tcm failed.\n");
> > + return PTR_ERR(vpu->reg.tcm);
> > + }
> > +
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_reg");
> > + vpu->reg.cfg = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(vpu->reg.cfg)) {
> > + dev_err(dev, "devm_ioremap_resource vpu cfg failed.\n");
> > + return PTR_ERR(vpu->reg.cfg);
> > + }
> > +
> > + /* Get VPU clock */
> > + vpu->clk = devm_clk_get(dev, "main");
> > + if (!vpu->clk) {
> > + dev_err(dev, "get vpu clock failed\n");
> > + return -EINVAL;
> > + }
> > +
> > + platform_set_drvdata(pdev, vpu);
> > +
> > + ret = clk_prepare(vpu->clk);
> > + if (ret) {
> > + dev_err(dev, "prepare vpu clock failed\n");
> > + return ret;
> > + }
> > +
> > + /* VPU watchdog */
> > + vpu->wdt.wq = create_singlethread_workqueue("vpu_wdt");
> > + if (!vpu->wdt.wq) {
> > + dev_err(dev, "initialize wdt workqueue failed\n");
> > + return -ENOMEM;
> > + }
> > + INIT_WORK(&vpu->wdt.ws, vpu_wdt_reset_func);
> > +
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> > + dev_err(dev, "enable vpu clock failed\n");
> > + goto workqueue_destroy;
> > + }
> > +
> > + dev_dbg(dev, "vpu ipi init\n");
> > + ret = vpu_ipi_init(vpu);
> > + if (ret) {
> > + dev_err(dev, "Failed to init ipi\n");
> > + goto disable_vpu_clk;
> > + }
> > +
> > + /* register vpu initialization IPI */
> > + ret = vpu_ipi_register(pdev, IPI_VPU_INIT, vpu_init_ipi_handler,
> > + "vpu_init", vpu);
> > + if (ret) {
> > + dev_err(dev, "Failed to register IPI_VPU_INIT\n");
> > + goto vpu_mutex_destroy;
> > + }
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > + vpu_debugfs = debugfs_create_file("mtk_vpu", S_IRUGO, NULL, (void *)dev,
> > + &vpu_debug_fops);
> > + if (!vpu_debugfs) {
> > + ret = -ENOMEM;
> > + goto cleanup_ipi;
> > + }
> > +#endif
> > +
> > + /* Set PTCM to 96K and DTCM to 32K */
> > + vpu_cfg_writel(vpu, 0x2, VPU_TCM_CFG);
> > +
> > + vpu->enable_4GB = !!(max_pfn > (0xffffffffUL >> PAGE_SHIFT));
> > + dev_dbg(dev, "4GB mode %u\n", vpu->enable_4GB);
> > +
> > + if (vpu->enable_4GB) {
> > + ret = of_reserved_mem_device_init(dev);
> > + if (ret)
> > + dev_info(dev, "init reserved memory failed\n");
> > + /* continue to use dynamic allocation if failed */
> > + }
> > +
> > + ret = vpu_alloc_ext_mem(vpu, D_FW);
> > + if (ret) {
> > + dev_err(dev, "Allocate DM failed\n");
> > + goto remove_debugfs;
> > + }
> > +
> > + ret = vpu_alloc_ext_mem(vpu, P_FW);
> > + if (ret) {
> > + dev_err(dev, "Allocate PM failed\n");
> > + goto free_d_mem;
> > + }
> > +
> > + init_waitqueue_head(&vpu->run.wq);
> > + init_waitqueue_head(&vpu->ack_wq);
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > + if (!res) {
> > + dev_err(dev, "get IRQ resource failed.\n");
> > + ret = -ENXIO;
> > + goto free_p_mem;
> > + }
> > + vpu->reg.irq = platform_get_irq(pdev, 0);
> > + ret = devm_request_irq(dev, vpu->reg.irq, vpu_irq_handler, 0,
> > + pdev->name, vpu);
> > + if (ret) {
> > + dev_err(dev, "failed to request irq\n");
> > + goto free_p_mem;
> > + }
> > +
> > + vpu_clock_disable(vpu);
> > + dev_dbg(dev, "initialization completed\n");
> > +
> > + return 0;
> > +
> > +free_p_mem:
> > + vpu_free_ext_mem(vpu, P_FW);
> > +free_d_mem:
> > + vpu_free_ext_mem(vpu, D_FW);
> > +remove_debugfs:
> > + of_reserved_mem_device_release(dev);
> > +#ifdef CONFIG_DEBUG_FS
> > + debugfs_remove(vpu_debugfs);
> > +cleanup_ipi:
> > +#endif
> > + memset(vpu->ipi_desc, 0, sizeof(struct vpu_ipi_desc) * IPI_MAX);
> > +vpu_mutex_destroy:
> > + mutex_destroy(&vpu->vpu_mutex);
> > +disable_vpu_clk:
> > + vpu_clock_disable(vpu);
> > +workqueue_destroy:
> > + destroy_workqueue(vpu->wdt.wq);
> > +
> > + return ret;
> > +}
> > +
> > +static const struct of_device_id mtk_vpu_match[] = {
> > + {
> > + .compatible = "mediatek,mt8173-vpu",
> > + },
> > + {},
> > +};
> > +MODULE_DEVICE_TABLE(of, mtk_vpu_match);
> > +
> > +static int mtk_vpu_remove(struct platform_device *pdev)
> > +{
> > + struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > + debugfs_remove(vpu_debugfs);
> > +#endif
> > + if (vpu->wdt.wq) {
> > + flush_workqueue(vpu->wdt.wq);
> > + destroy_workqueue(vpu->wdt.wq);
> > + }
> > + vpu_free_ext_mem(vpu, P_FW);
> > + vpu_free_ext_mem(vpu, D_FW);
> > + mutex_destroy(&vpu->vpu_mutex);
> > + clk_unprepare(vpu->clk);
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver mtk_vpu_driver = {
> > + .probe = mtk_vpu_probe,
> > + .remove = mtk_vpu_remove,
> > + .driver = {
> > + .name = "mtk_vpu",
> > + .owner = THIS_MODULE,
> > + .of_match_table = mtk_vpu_match,
> > + },
> > +};
> > +
> > +module_platform_driver(mtk_vpu_driver);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("Mediatek Video Prosessor Unit driver");
> > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.h b/drivers/media/platform/mtk-vpu/mtk_vpu.h
> > new file mode 100644
> > index 0000000..d9c3cde
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.h
> > @@ -0,0 +1,167 @@
> > +/*
> > +* Copyright (c) 2015 MediaTek Inc.
> > +* Author: Andrew-CT Chen <andrew-ct.chen@xxxxxxxxxxxx>
> > +*
> > +* 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_DEC: decoder reset id
> > + * @VPU_RST_ENC: encoder reset id
> > + * @VPU_RST_MDP: MDP (Media Data Path) reset id
> > + * @VPU_RST_MAX: maximum reset id
> > + */
> > +enum rst_id {
> > + VPU_RST_ENC,
> > + VPU_RST_DEC,
> > + VPU_RST_MDP,
> > + 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 */
> > --
> > 1.7.9.5
> >
> > --
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> > More majordomo info at http://vger.kernel.org/majordomo-info.html

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