Re: [PATCH 02/10] media: mtk-vcodec: add SCP firmware ops

[Tiffany Lin <tiffany.lin@mediatek.com>]

On Wed, 2020-05-20 at 17:27 +0900, Alexandre Courbot wrote:
> From: Yunfei Dong <yunfei.dong@mediatek.com>
> 
> Add support for communicating with the SCP firmware, which will be used
> by MT8183.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> [acourbot: refactor, cleanup and split]
> Co-developed-by: Alexandre Courbot <acourbot@chromium.org>
> Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
> ---
>  drivers/media/platform/Kconfig                |  2 +
>  .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c  |  3 +
>  .../platform/mtk-vcodec/mtk_vcodec_enc_drv.c  |  3 +
>  .../media/platform/mtk-vcodec/mtk_vcodec_fw.c | 56 +++++++++++++++++++
>  .../media/platform/mtk-vcodec/mtk_vcodec_fw.h |  2 +
>  5 files changed, 66 insertions(+)
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index c57ee78fa99d..9b11dd6b1ef3 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -256,6 +256,8 @@ config VIDEO_MEDIATEK_VCODEC
>  	select VIDEOBUF2_DMA_CONTIG
>  	select V4L2_MEM2MEM_DEV
>  	select VIDEO_MEDIATEK_VPU
> +	select MTK_SCP
> +	default n
>  	help
>  	    Mediatek video codec driver provides HW capability to
>  	    encode and decode in a range of video formats
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> index 4f07a5fcce7f..5b5765b98e57 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> @@ -225,6 +225,9 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  	if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
>  				  &rproc_phandle)) {
>  		fw_type = VPU;
> +	} else if (!of_property_read_u32(pdev->dev.of_node, "mediatek,scp",
> +					 &rproc_phandle)) {
> +		fw_type = SCP;
>  	} else {
>  		mtk_v4l2_err("Could not get vdec IPI device");
>  		return -ENODEV;
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> index 4340ea10afd0..42530cd01a30 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> @@ -233,6 +233,9 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  	if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
>  				  &rproc_phandle)) {
>  		fw_type = VPU;
> +	} else if (!of_property_read_u32(pdev->dev.of_node, "mediatek,scp",
> +					 &rproc_phandle)) {
> +		fw_type = SCP;
>  	} else {
>  		mtk_v4l2_err("Could not get venc IPI device");
>  		return -ENODEV;
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> index 967bb100a990..f2a62ea62fc6 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> @@ -19,6 +19,7 @@ struct mtk_vcodec_fw {
>  	enum mtk_vcodec_fw_type type;
>  	const struct mtk_vcodec_fw_ops *ops;
>  	struct platform_device *pdev;
> +	struct mtk_scp *scp;
>  };
>  
>  static int mtk_vcodec_vpu_load_firmware(struct mtk_vcodec_fw *fw)
> @@ -71,6 +72,48 @@ static const struct mtk_vcodec_fw_ops mtk_vcodec_vpu_msg = {
>  	.ipi_send = mtk_vcodec_vpu_ipi_send,
>  };
>  
> +static int mtk_vcodec_scp_load_firmware(struct mtk_vcodec_fw *fw)
> +{
> +	return rproc_boot(scp_get_rproc(fw->scp));


Does rproc_boot and scp_get_rproc depend on the other kernel module?
where are they defineded?

> +}
> +
> +static unsigned int mtk_vcodec_scp_get_vdec_capa(struct mtk_vcodec_fw *fw)
> +{
> +	return scp_get_vdec_hw_capa(fw->scp);
> +}
> +
> +static unsigned int mtk_vcodec_scp_get_venc_capa(struct mtk_vcodec_fw *fw)
> +{
> +	return scp_get_venc_hw_capa(fw->scp);
> +}
> +
> +static void *mtk_vcodec_vpu_scp_dm_addr(struct mtk_vcodec_fw *fw,
> +					u32 dtcm_dmem_addr)
> +{
> +	return scp_mapping_dm_addr(fw->scp, dtcm_dmem_addr);
> +}
> +
> +static int mtk_vcodec_scp_set_ipi_register(struct mtk_vcodec_fw *fw, int id,
> +		mtk_vcodec_ipi_handler handler, const char *name, void *priv)
> +{
> +	return scp_ipi_register(fw->scp, id, handler, priv);
> +}
> +
> +static int mtk_vcodec_scp_ipi_send(struct mtk_vcodec_fw *fw, int id, void *buf,
> +		unsigned int len, unsigned int wait)
> +{
> +	return scp_ipi_send(fw->scp, id, buf, len, wait);
> +}
> +
> +static const struct mtk_vcodec_fw_ops mtk_vcodec_rproc_msg = {
> +	.load_firmware = mtk_vcodec_scp_load_firmware,
> +	.get_vdec_capa = mtk_vcodec_scp_get_vdec_capa,
> +	.get_venc_capa = mtk_vcodec_scp_get_venc_capa,
> +	.map_dm_addr = mtk_vcodec_vpu_scp_dm_addr,
> +	.ipi_register = mtk_vcodec_scp_set_ipi_register,
> +	.ipi_send = mtk_vcodec_scp_ipi_send,
> +};
> +
>  static void mtk_vcodec_reset_handler(void *priv)
>  {
>  	struct mtk_vcodec_dev *dev = priv;
> @@ -94,6 +137,7 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_select(struct mtk_vcodec_dev *dev,
>  	const struct mtk_vcodec_fw_ops *ops;
>  	struct mtk_vcodec_fw *fw;
>  	struct platform_device *fw_pdev = NULL;
> +	struct mtk_scp *scp = NULL;
>  
>  	switch (type) {
>  	case VPU:
> @@ -106,6 +150,14 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_select(struct mtk_vcodec_dev *dev,
>  		vpu_wdt_reg_handler(fw_pdev, mtk_vcodec_reset_handler,
>  				    dev, rst_id);
>  		break;
> +	case SCP:
> +		ops = &mtk_vcodec_rproc_msg;
> +		scp = scp_get(dev->plat_dev);
> +		if (!scp) {
> +			mtk_v4l2_err("could not get vdec scp handle");
> +			return ERR_PTR(-EPROBE_DEFER);
> +		}
> +		break;
>  	default:
>  		mtk_v4l2_err("invalid vcodec fw type");
>  		return ERR_PTR(-EINVAL);
> @@ -118,6 +170,7 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_select(struct mtk_vcodec_dev *dev,
>  	fw->type = type;
>  	fw->ops = ops;
>  	fw->pdev = fw_pdev;
> +	fw->scp = scp;
>  
>  	return fw;
>  }
> @@ -129,6 +182,9 @@ void mtk_vcodec_fw_release(struct mtk_vcodec_fw *fw)
>  	case VPU:
>  		put_device(&fw->pdev->dev);
>  		break;
> +	case SCP:
> +		scp_put(fw->scp);
> +		break;
>  	}
>  }
>  EXPORT_SYMBOL_GPL(mtk_vcodec_fw_release);
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.h
> index ff25b0c19f74..ced1b6a10e07 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.h
> @@ -4,6 +4,7 @@
>  #define _MTK_VCODEC_FW_H_
>  
>  #include <linux/remoteproc.h>
> +#include <linux/remoteproc/mtk_scp.h>
>  
>  #include "../mtk-vpu/mtk_vpu.h"
>  
> @@ -11,6 +12,7 @@ struct mtk_vcodec_dev;
>  
>  enum mtk_vcodec_fw_type {
>  	VPU,
> +	SCP,
>  };
>  
>  struct mtk_vcodec_fw;