OpenHarmony实战：瑞芯微RK3568移植案例
本文章是基于瑞芯微RK3568芯片的DAYU200开发板，进行标准系统相关功能的移植，主要包括产品配置添加，内核启动、升级，音频ADM化，Camera，TP，LCD，WIFI，BT，vibrator、sensor、图形显示模块的适配案例总结，以及相关功能的适配。
产品配置和目录规划
产品配置
在产品//productdefine/common/device目录下创建以rk3568名字命名的json文件，并指定CPU的架构。//productdefine/common/device/rk3568.json配置如下：
{
"device_name": "rk3568",
"device_company": "rockchip",
"target_os": "ohos",
"target_cpu": "arm",
"kernel_version": "",
"device_build_path": "device/board/hihope/rk3568",
"enable_ramdisk": true, //是否支持ramdisk二级启动
"build_selinux": true // 是否支持selinux权限管理
}在//productdefine/common/products目录下创建以产品名命名的rk3568.json文件。该文件用于描述产品所使用的SOC 以及所需的子系统。配置如下
{
"product_name": "rk3568",
"product_company" : "hihope",
"product_device": "rk3568",
"version": "2.0",
"type": "standard",
"parts":{
"ace:ace_engine_standard":{},
"ace:napi":{},
...
"xts:phone_tests":{}
}
}主要的配置内容包括：
- product_device：配置所使用的SOC。
- type：配置系统的级别， 这里直接standard即可。
- parts：系统需要启用的子系统。子系统可以简单理解为一块独立构建的功能块。
已定义的子系统可以在//build/subsystem_config.json中找到。当然你也可以定制子系统。
这里建议先拷贝Hi3516DV300开发板的配置文件，删除掉hisilicon_products这个子系统。这个子系统为Hi3516DV300 SOC编译内核，不适合rk3568。
目录规划
参考Board和SoC解耦的设计思路，并把芯片适配目录规划为：
device
├── board --- 单板厂商目录
│ └── hihope --- 单板厂商名字：
│ └── rk3568 --- 单板名：rk3568,主要放置开发板相关的驱动业务代码
└── soc --- SoC厂商目录
└── rockchip --- SoC厂商名字：rockchip
└── rk3568 --- SoC Series名：rk3568,主要为芯片原厂提供的一些方案，以及闭源库等
vendor
└── hihope
└── rk3568 --- 产品名字：产品、hcs以及demo相关内核启动
二级启动
二级启动简单来说就是将之前直接挂载sytem,从system下的init启动，改成先挂载ramdsik,从ramdsik中的init 启动，做些必要的初始化动作，如挂载system,vendor等分区，然后切到system下的init 。
Rk3568适配主要是将主线编译出来的ramdisk 打包到boot_linux.img中，主要有以下工作：
1.使能二级启动
在productdefine/common/device/rk3568.json 中使能enable_ramdisk。
{
"device_name": "rk3568",
"device_company": "hihope",
"target_os": "ohos",
"target_cpu": "arm",
"kernel_version": "",
"device_build_path": "device/hihope/build",
"enable_ramdisk": true,
"build_selinux": true
}2.把主线编译出来的ramdsik.img 打包到boot_linux.img
配置：
由于rk 启动uboot 支持从ramdisk 启动，只需要在打包boot_linux.img 的配置文件中增加ramdisk.img ,因此没有使用主线的its格式，具体配置就是在内核编译脚本make-ohos.sh 中增加:
function make_extlinux_conf()
{
dtb_path=$1
uart=$2
image=$3
echo "label rockchip-kernel-5.10" > ${EXTLINUX_CONF}
echo " kernel /extlinux/${image}" >> ${EXTLINUX_CONF}
echo " fdt /extlinux/${TOYBRICK_DTB}" >> ${EXTLINUX_CONF}
if [ "enable_ramdisk" == "${ramdisk_flag}" ]; then
echo " initrd /extlinux/ramdisk.img" >> ${EXTLINUX_CONF}
fi
cmdline="append earlycon=uart8250,mmio32,${uart} root=PARTUUID=614e0000-0000-4b53-8000-1d28000054a9 rw rootwait rootfstype=ext4"
echo " ${cmdline}" >> ${EXTLINUX_CONF}
}打包
增加了打包boot镜像的脚本make-boot.sh，供编译完ramdisk,打包boot 镜像时调用, 主要内容:
genext2fs -B ${blocks} -b ${block_size} -d boot_linux -i 8192 -U boot_linux.img音频
RK3568 Audio总体结构图
ADM适配方案介绍
RK3568平台适配ADM框架图
-
ADM Drivers adapter
主要完成Codec/DMA/I2S驱动注册，使得ADM可以加载驱动节点；并注册ADM与Drivers交互的接口函数
-
ADM Drivers impl
主要完成ADM Drivers adapter接口函数的实现，以及Codec_config.hcs/dai_config.hcs等配置信息的获取，并注册到对应的设备
-
Linux Drivers
ADM Drivers impl可以直接阅读硬件手册，完成驱动端到端的配置；也可以借用Linux原生驱动实现与接口，减少开发者工作量。
目录结构
./device/board/hihope/rk3568/audio_drivers
├── codec
│ └── rk809_codec
│ ├── include
│ │ ├── rk809_codec_impl.h
│ │ └── rk817_codec.h
│ └── src
│ ├── rk809_codec_adapter.c
│ ├── rk809_codec_linux_driver.c
│ └── rk809_codec_ops.c
├── dai
│ ├── include
│ │ ├── rk3568_dai_linux.h
│ │ └── rk3568_dai_ops.h
│ └── src
│ ├── rk3568_dai_adapter.c
│ ├── rk3568_dai_linux_driver.c
│ └── rk3568_dai_ops.c
├── dsp
│ ├── include
│ │ └── rk3568_dsp_ops.h
│ └── src
│ ├── rk3568_dsp_adapter.c
│ └── rk3568_dsp_ops.c
├── include
│ ├── audio_device_log.h
│ └── rk3568_audio_common.h
└── soc
├── include
│ └── rk3568_dma_ops.h
└── src
├── rk3568_dma_adapter.c
└── rk3568_dma_ops.cRK3568适配ADM详细过程
梳理平台Audio框架
梳理目标平台的Audio结构，明确数据流与控制流通路。
- 针对RK3568平台，Audio的结构相对简单见RK3568 Audio总体结构图，Codec作为一个独立设备。I2C完成对设备的控制，I2S完成Codec设备与CPU之间的交互。
- 结合原理图整理I2S通道号，对应的引脚编号；I2C的通道号，地址等硬件信息。
- 获取Codec对应的datasheet，以及RK3568平台的Datasheet(包含I2S/DMA通道等寄存器的介绍)。
熟悉并了解ADM结构
ADM结构框图如下，Audio Peripheral Drivers和Platform Drivers为平台适配需要完成的工作。
结合第1步梳理出来的Audio结构分析，Audio Peripheral Drivers包含Rk809的驱动，Platform Drivers包含DMA驱动和I2S驱动。
| 需要适配的驱动 | ADM对应模块 | 接口文件路径 |
|---|---|---|
| RK809驱动 | Accessory | drivers/framework/include/audio/audio_accessory_if.h |
| DMA驱动 | platform | drivers/framework/include/audio/audio_platform_if.h |
| I2S驱动 | DAI | drivers/framework/include/audio/audio_dai_if.h.h |
搭建驱动代码框架
配置HCS文件
在device_info.hcs文件中Audio下注册驱动节点
audio :: host {
hostName = "audio_host";
priority = 60;
device_dai0 :: device {
device0 :: deviceNode {
policy = 1;
priority = 50;
preload = 0;
permission = 0666;
moduleName = "DAI_RK3568";
serviceName = "dai_service";
deviceMatchAttr = "hdf_dai_driver";
}
}
device_codec :: device {
device0 :: deviceNode {
policy = 1;
priority = 50;
preload = 0;
permission = 0666;
moduleName = "CODEC_RK809";
serviceName = "codec_service_0";
deviceMatchAttr = "hdf_codec_driver";
}
}
device_codec_ex :: device {
device0 :: deviceNode {
policy = 1;
priority = 50;
preload = 0;
permission = 0666;
moduleName = "CODEC_RK817";
serviceName = "codec_service_1";
deviceMatchAttr = "hdf_codec_driver_ex";
}
}
device_dsp :: device {
device0 :: deviceNode {
policy = 1;
priority = 50;
preload = 0;
permission = 0666;
moduleName = "DSP_RK3568";
serviceName = "dsp_service_0";
deviceMatchAttr = "hdf_dsp_driver";
}
}
device_dma :: device {
device0 :: deviceNode {
policy = 1;
priority = 50;
preload = 0;
permission = 0666;
moduleName = "DMA_RK3568";
serviceName = "dma_service_0";
deviceMatchAttr = "hdf_dma_driver";
}
}
......
}根据接入的设备，选择Codec节点还是Accessory节点，配置硬件设备对应的私有属性（包含寄存器首地址，相关control寄存器地址）涉及Codec_config.hcs和DAI_config.hcs
配置相关介绍见Audio hcs配置章节以及ADM框架的audio_parse模块代码。
codec/accessory模块
-
将驱动注册到HDF框架中，代码片段如下，启动moduleName与HCS文件的中moduleName一致
struct HdfDriverEntry g_codecDriverEntry = { .moduleVersion = 1, .moduleName = "CODEC_HI3516", .Bind = CodecDriverBind, .Init = CodecDriverInit, .Release = CodecDriverRelease, }; HDF_INIT(g_codecDriverEntry); -
Codec模块需要填充：
g_codecData：codec设备的操作函数集和私有数据集。
g_codecDaiDeviceOps：codecDai的操作函数集，包括启动传输和参数配置等函数接口。
g_codecDaiData：codec的数字音频接口的操作函数集和私有数据集。
-
完成 bind、init和release函数的实现
-
验证
在bind和init函数加调试日志，编译版本并获取系统系统日志:
[ 1.548624] [E/"rk809_codec_adapter"] [Rk809DriverBind][line:258]: enter
[ 1.548635] [E/"rk809_codec_adapter"] [Rk809DriverBind][line:260]: success
[ 1.548655] [E/"rk809_codec_adapter"] [Rk809DriverInit][line:270]: enter
[ 1.549050] [E/"rk809_codec_adapter"] [GetServiceName][line:226]: enter
[ 1.549061] [E/"rk809_codec_adapter"] [GetServiceName][line:250]: success
[ 1.549072] [E/"rk809_codec_adapter"] [Rk809DriverInit][line:316]: g_chip->accessory.drvAccessoryName = codec_service_1
[ 1.549085] [E/audio_core] [AudioSocRegisterDai][line:86]: Register [accessory_dai] success.
[ 1.549096] [E/audio_core] [AudioRegisterAccessory][line:120]: Register [codec_service_1] success.
[ 1.549107] [E/"rk809_codec_adapter"] [Rk809DriverInit][line:323]: success!DAI模块
-
将I2S驱动注册到HDF框架中，代码片段如下，启动moduleName与HCS文件的中moduleName一致
struct HdfDriverEntry g_daiDriverEntry = { .moduleVersion = 1, .moduleName = "DAI_RK3568", .Bind = DaiDriverBind, .Init = DaiDriverInit, .Release = DaiDriverRelease, }; HDF_INIT(g_daiDriverEntry); -
DAI模块填充：
struct AudioDaiOps g_daiDeviceOps = { .Startup = Rk3568DaiStartup, .HwParams = Rk3568DaiHwParams, .Trigger = Rk3568NormalTrigger, }; struct DaiData g_daiData = { .Read = Rk3568DeviceReadReg, .Write = Rk3568DeviceWriteReg, .DaiInit = Rk3568DaiDeviceInit, .ops = &g_daiDeviceOps, }; -
完成 bind、init和release函数的实现
-
验证
在bind/init函数加调试日志，编译版本并获取系统系统日志
[ 1.549193] [I/device_node] launch devnode dai_service [ 1.549204] [E/HDF_LOG_TAG] [DaiDriverBind][line:38]: entry! [ 1.549216] [E/HDF_LOG_TAG] [DaiDriverBind][line:55]: success! [ 1.549504] [E/audio_core] [AudioSocRegisterDai][line:86]: Register [dai_service] success. [ 1.549515] [E/HDF_LOG_TAG] [DaiDriverInit][line:116]: success.
Platform模块
-
将DMA驱动注册到HDF框架中，代码片段如下，启动moduleName与HCS文件的中moduleName一致
struct HdfDriverEntry g_platformDriverEntry = { .moduleVersion = 1, .moduleName = "DMA_RK3568", .Bind = PlatformDriverBind, .Init = PlatformDriverInit, .Release = PlatformDriverRelease, }; HDF_INIT(g_platformDriverEntry); -
DMA模块需要填充：
struct AudioDmaOps g_dmaDeviceOps = { .DmaBufAlloc = Rk3568DmaBufAlloc, .DmaBufFree = Rk3568DmaBufFree, .DmaRequestChannel = Rk3568DmaRequestChannel, .DmaConfigChannel = Rk3568DmaConfigChannel, .DmaPrep = Rk3568DmaPrep, .DmaSubmit = Rk3568DmaSubmit, .DmaPending = Rk3568DmaPending, .DmaPause = Rk3568DmaPause, .DmaResume = Rk3568DmaResume, .DmaPointer = Rk3568PcmPointer, }; struct PlatformData g_platformData = { .PlatformInit = AudioDmaDeviceInit, .ops = &g_dmaDeviceOps, }; -
完成 bind、init和release函数的实现
-
验证
在bind和init函数加调试日志,编译版本并获取系统系统日志
[ 1.548469] [E/rk3568_platform_adapter] [PlatformDriverBind][line:42]: entry! [ 1.548481] [E/rk3568_platform_adapter] [PlatformDriverBind][line:58]: success! [ 1.548492] [E/rk3568_platform_adapter] [PlatformDriverInit][line:100]: entry. [ 1.548504] [E/rk3568_platform_adapter] [PlatformGetServiceName][line:67]: entry! [ 1.548515] [E/rk3568_platform_adapter] [PlatformGetServiceName][line:91]: success! [ 1.548528] [E/audio_core] [AudioSocRegisterPlatform][line:63]: Register [dma_service_0] success. [ 1.548536] [E/rk3568_platform_adapter] [PlatformDriverInit][line:119]: success.
驱动适配
code/accessory模块
-
读取DTS文件，获取到对应设备节点，使用Linux原生的驱动注册函数，获取到对应device。
static int rk817_platform_probe(struct platform_device *pdev) { rk817_pdev = pdev; dev_info(&pdev->dev, "got rk817-codec platform_device"); return 0; } static struct platform_driver rk817_codec_driver = { .driver = { .name = "rk817-codec", // codec node in dts file .of_match_table = rk817_codec_dt_ids, }, .probe = rk817_platform_probe, .remove = rk817_platform_remove, }; -
读写寄存器函数封装 根据上述获取到的device, 使用Linux的regmap函数，开发者不需要获取模块的基地址 获取rk817的regmap代码段
g_chip = devm_kzalloc(&rk817_pdev->dev, sizeof(struct Rk809ChipData), GFP_KERNEL); if (!g_chip) { AUDIO_DEVICE_LOG_ERR("no memory"); return HDF_ERR_MALLOC_FAIL; } g_chip->pdev = rk817_pdev; struct rk808 *rk808 = dev_get_drvdata(g_chip->pdev->dev.parent); if (!rk808) { AUDIO_DEVICE_LOG_ERR("%s: rk808 is NULL\n", __func__); ret = HDF_FAILURE; RK809ChipRelease(); return ret; } g_chip->regmap = devm_regmap_init_i2c(rk808->i2c, &rk817_codec_regmap_config); if (IS_ERR(g_chip->regmap)) { AUDIO_DEVICE_LOG_ERR("failed to allocate regmap: %ld\n", PTR_ERR(g_chip->regmap)); RK809ChipRelease(); return ret; }寄存器读写函数代码段
int32_t Rk809DeviceRegRead(uint32_t reg, uint32_t *val) { if (regmap_read(g_chip->regmap, reg, val)) { AUDIO_DRIVER_LOG_ERR("read register fail: [%04x]", reg); return HDF_FAILURE; } return HDF_SUCCESS; } int32_t Rk809DeviceRegWrite(uint32_t reg, uint32_t value) { if (regmap_write(g_chip->regmap, reg, value)) { AUDIO_DRIVER_LOG_ERR("write register fail: [%04x] = %04x", reg, value); return HDF_FAILURE; } return HDF_SUCCESS; } int32_t Rk809DeviceRegUpdatebits(uint32_t reg, uint32_t mask, uint32_t value) { if (regmap_update_bits(g_chip->regmap, reg, mask, value)) { AUDIO_DRIVER_LOG_ERR("update register bits fail: [%04x] = %04x", reg, value); return HDF_FAILURE; } return HDF_SUCCESS; } -
寄存器初始化函数
因为使用Linux的regmap函数，所以需要自行定义RegDefaultInit函数，读取hcs中initSeqConfig的寄存器以及数值来进行配置
RK809RegDefaultInit代码段
int32_t RK809RegDefaultInit(struct AudioRegCfgGroupNode **regCfgGroup) { int32_t i; struct AudioAddrConfig *regAttr = NULL; if (regCfgGroup == NULL || regCfgGroup[AUDIO_INIT_GROUP] == NULL || regCfgGroup[AUDIO_INIT_GROUP]->addrCfgItem == NULL || regCfgGroup[AUDIO_INIT_GROUP]->itemNum <= 0) { AUDIO_DEVICE_LOG_ERR("input invalid parameter."); return HDF_ERR_INVALID_PARAM; } regAttr = regCfgGroup[AUDIO_INIT_GROUP]->addrCfgItem; for (i = 0; i < regCfgGroup[AUDIO_INIT_GROUP]->itemNum; i++) { Rk809DeviceRegWrite(regAttr[i].addr, regAttr[i].value); } return HDF_SUCCESS; } -
封装控制接口的读写函数
设置控制读写函数为RK809CodecReadReg和RK809CodecWriteReg
struct CodecData g_rk809Data = { .Init = Rk809DeviceInit, .Read = RK809CodecReadReg, .Write = RK809CodecWriteReg, }; struct AudioDaiOps g_rk809DaiDeviceOps = { .Startup = Rk809DaiStartup, .HwParams = Rk809DaiHwParams, .Trigger = RK809NormalTrigger, }; struct DaiData g_rk809DaiData = { .DaiInit = Rk809DaiDeviceInit, .ops = &g_rk809DaiDeviceOps, };封装控制接口的读写函数
因为原来的读写原型，涉及三个参数(unsigned long virtualAddress,uint32_t reg, uint32_t *val)，其中virtualAddress我们并不需要用到，所以封装个接口即可，封装如下
int32_t RK809CodecReadReg(unsigned long virtualAddress,uint32_t reg, uint32_t *val) { if (val == NULL) { AUDIO_DRIVER_LOG_ERR("param val is null."); return HDF_FAILURE; } if (Rk809DeviceRegRead(reg, val)) { AUDIO_DRIVER_LOG_ERR("read register fail: [%04x]", reg); return HDF_FAILURE; } ADM_LOG_ERR("read reg 0x[%02x] = 0x[%02x]",reg,*val); return HDF_SUCCESS; } int32_t RK809CodecWriteReg(unsigned long virtualAddress,uint32_t reg, uint32_t value) { if (Rk809DeviceRegWrite(reg, value)) { AUDIO_DRIVER_LOG_ERR("write register fail: [%04x] = %04x", reg, value); return HDF_FAILURE; } ADM_LOG_ERR("write reg 0x[%02x] = 0x[%02x]",reg,value); return HDF_SUCCESS; } -
其他ops函数
- Rk809DeviceInit，读取hcs文件，初始化Codec寄存器，同时将对应的control配置（/* reg, rreg, shift, rshift, min, max, mask, invert, value */添加到kcontrol，便于dispatch contro进行控制
- Rk809DaiStartup, 读取hcs文件，配置可选设备（codec/accessory）的控制寄存器
- Rk809DaiHwParams, 根据hal下发的audio attrs（采样率、format、channel等）,配置对应的寄存器
- RK809NormalTrigger，根据hal下发的操作命令码，操作对应的寄存器，实现Codec的启动停止、录音和放音的切换等
DAI(i2s)模块
-
读写寄存器函数 思路与Codec模块的一致,读取Linux DTS文件，使用Linux的regmap函数完成寄存器的读写操作
int32_t Rk3568DeviceReadReg(unsigned long regBase, uint32_t reg, uint32_t *val) { AUDIO_DEVICE_LOG_ERR("entry"); (void)regBase; struct device_node *dmaOfNode = of_find_node_by_path("/i2s@fe410000"); if(dmaOfNode == NULL) { AUDIO_DEVICE_LOG_ERR("of_node is NULL."); } struct platform_device *platformdev = of_find_device_by_node(dmaOfNode); struct rk3568_i2s_tdm_dev *i2s_tdm = dev_get_drvdata(&platformdev->dev); (void)regBase; if (regmap_read(i2s_tdm->regmap, reg, val)) { AUDIO_DEVICE_LOG_ERR("read register fail: [%04x]", reg); return HDF_FAILURE; } return HDF_SUCCESS; } int32_t Rk3568DeviceWriteReg(unsigned long regBase, uint32_t reg, uint32_t value) { AUDIO_DEVICE_LOG_ERR("entry"); (void)regBase; struct device_node *dmaOfNode = of_find_node_by_path("/i2s@fe410000"); if(dmaOfNode == NULL) { AUDIO_DEVICE_LOG_ERR("of_node is NULL."); } struct platform_device *platformdev = of_find_device_by_node(dmaOfNode); struct rk3568_i2s_tdm_dev *i2s_tdm = dev_get_drvdata(&platformdev->dev); if (regmap_write(i2s_tdm->regmap, reg, value)) { AUDIO_DEVICE_LOG_ERR("write register fail: [%04x] = %04x", reg, value); return HDF_FAILURE; } return HDF_SUCCESS; } -
其他ops函数
-
Rk3568DaiDeviceInit 原始框架，主要完成DAI_config.hcs参数列表的读取，与HwParams结合，完成参数的设置。
-
Rk3568DaiHwParams 主要完成I2S MCLK/BCLK/LRCLK时钟配置。
- 根据不同采样率计算MCLK
int32_t RK3568I2sTdmSetSysClk(struct rk3568_i2s_tdm_dev *i2s_tdm, const struct AudioPcmHwParams *param) { /* Put set mclk rate into rockchip_i2s_tdm_set_mclk() */ uint32_t sampleRate = param->rate; uint32_t mclk_parent_freq = 0; switch (sampleRate) { case AUDIO_DEVICE_SAMPLE_RATE_8000: case AUDIO_DEVICE_SAMPLE_RATE_16000: case AUDIO_DEVICE_SAMPLE_RATE_24000: case AUDIO_DEVICE_SAMPLE_RATE_32000: case AUDIO_DEVICE_SAMPLE_RATE_48000: case AUDIO_DEVICE_SAMPLE_RATE_64000: case AUDIO_DEVICE_SAMPLE_RATE_96000: mclk_parent_freq = i2s_tdm->bclk_fs * AUDIO_DEVICE_SAMPLE_RATE_192000; break; case AUDIO_DEVICE_SAMPLE_RATE_11025: case AUDIO_DEVICE_SAMPLE_RATE_22050: case AUDIO_DEVICE_SAMPLE_RATE_44100: mclk_parent_freq = i2s_tdm->bclk_fs * AUDIO_DEVICE_SAMPLE_RATE_176400; break; default: AUDIO_DEVICE_LOG_ERR("Invalid LRCK freq: %u Hz\n", sampleRate); return HDF_FAILURE; } i2s_tdm->mclk_tx_freq = mclk_parent_freq; i2s_tdm->mclk_rx_freq = mclk_parent_freq; return HDF_SUCCESS; }- 根据获取的mclk,计算BCLK/LRclk分频系数
-
Rk3568NormalTrigger 根据输入输出类型，以及cmd(启动/停止/暂停/恢复)，完成一系列配置：
- mclk的启停
- DMA搬运的启停
- 传输的启停 详细实现见代码，参考Linux原生I2s驱动对应接口函数
// 启动/恢复流程 if (streamType == AUDIO_RENDER_STREAM) { clk_prepare_enable(i2s_tdm->mclk_tx); regmap_update_bits(i2s_tdm->regmap, I2S_DMACR, I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_ENABLE); } else { clk_prepare_enable(i2s_tdm->mclk_rx); regmap_update_bits(i2s_tdm->regmap, I2S_DMACR, I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_ENABLE); if (regmap_read(i2s_tdm->regmap, I2S_DMACR, &val)) { AUDIO_DEVICE_LOG_ERR("read register fail: [%04x]", I2S_DMACR); return ; } AUDIO_DEVICE_LOG_ERR("i2s reg: 0x%x = 0x%x ", I2S_DMACR, val); } if (atomic_inc_return(&i2s_tdm->refcount) == 1) { regmap_update_bits(i2s_tdm->regmap, I2S_XFER, I2S_XFER_TXS_START | I2S_XFER_RXS_START, I2S_XFER_TXS_START | I2S_XFER_RXS_START); if (regmap_read(i2s_tdm->regmap, I2S_XFER, &val)) { AUDIO_DEVICE_LOG_ERR("read register fail: [%04x]", I2S_XFER); return ; } AUDIO_DEVICE_LOG_ERR("i2s reg: 0x%x = 0x%x ", I2S_XFER, val); }
Platform(DMA)模块
ops函数相关函数
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Rk3568DmaBufAlloc/Rk3568DmaBufFree
获取DMA设备节点，参考I2s设备获取方式，使用系统函数dma_alloc_wc/dma_free_wc，完成DMA虚拟内存与物理内存的申请/释放
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Rk3568DmaRequestChannel
使用Linux DMA原生接口函数获取DMA传输通道