[U-Boot] [PATCH 4/5] usb: gadget: f_sdp: Allow SPL to load and boot FIT via SDP

[Schrempf Frieder]

Hi Sjoerd,

On 03.06.19 21:00, Sjoerd Simons wrote:
> From: Frieder Schrempf <frieder.schrempf at kontron.de>
> 
> Add support for loading u-boot FIT images over the USB SPD protocol in
> the SPL

I always get confused by this acronym too, but *SPD* is the Social 
Democratic Party of Germany, currently in a deep crisis after the recent 
election and after their leader resigned from all offices two days ago.

And *SDP* is the Serial Download Protocol ;)

> 
> [Small fixes to build]
> Signed-off-by: Sjoerd Simons <sjoerd.simons at collabora.co.uk>

Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>

Thanks a lot for preparing the patch and sending it!

Regards,
Frieder

> ---
> 
>   common/spl/spl_sdp.c       | 11 ++++++++--
>   drivers/usb/gadget/f_sdp.c | 41 ++++++++++++++++++++++++++++++++------
>   include/sdp.h              |  4 +++-
>   3 files changed, 47 insertions(+), 9 deletions(-)
> 
> diff --git a/common/spl/spl_sdp.c b/common/spl/spl_sdp.c
> index 807256e908..dc57171966 100644
> --- a/common/spl/spl_sdp.c
> +++ b/common/spl/spl_sdp.c
> @@ -26,9 +26,16 @@ static int spl_sdp_load_image(struct spl_image_info *spl_image,
>   	}
>   
>   	/* This command typically does not return but jumps to an image */
> -	sdp_handle(controller_index);
> +	sdp_handle(controller_index, spl_image);
>   	pr_err("SDP ended\n");
> +	/*
> +	 * This command either loads a legacy image, jumps and never returns,
> +	 * or it loads a FIT image and returns it to be handled by the SPL
> +	 * code.
> +	 */
> +	ret = sdp_handle(controller_index, spl_image);
> +	debug("SDP ended\n");
>   
> -	return -EINVAL;
> +	return ret;
>   }
>   SPL_LOAD_IMAGE_METHOD("USB SDP", 0, BOOT_DEVICE_BOARD, spl_sdp_load_image);
> diff --git a/drivers/usb/gadget/f_sdp.c b/drivers/usb/gadget/f_sdp.c
> index ae97ab2b49..2a23160d91 100644
> --- a/drivers/usb/gadget/f_sdp.c
> +++ b/drivers/usb/gadget/f_sdp.c
> @@ -638,7 +638,18 @@ static u32 sdp_jump_imxheader(void *address)
>   	return 0;
>   }
>   
> -static void sdp_handle_in_ep(void)
> +#ifdef CONFIG_SPL_LOAD_FIT
> +static ulong sdp_fit_read(struct spl_load_info *load, ulong sector,
> +			  ulong count, void *buf)
> +{
> +	debug("%s: sector %lx, count %lx, buf %lx\n",
> +	      __func__, sector, count, (ulong)buf);
> +	memcpy(buf, (void *)(load->dev + sector), count);
> +	return count;
> +}
> +#endif
> +
> +static void sdp_handle_in_ep(struct spl_image_info *spl_image)
>   {
>   	u8 *data = sdp_func->in_req->buf;
>   	u32 status;
> @@ -689,11 +700,26 @@ static void sdp_handle_in_ep(void)
>   
>   		/* If imx header fails, try some U-Boot specific headers */
>   		if (status) {
> +			image_header_t *header =
> +				sdp_ptr(sdp_func->jmp_address);
>   #ifdef CONFIG_SPL_BUILD
> +#ifdef CONFIG_SPL_LOAD_FIT
> +			if (image_get_magic(header) == FDT_MAGIC) {
> +				struct spl_load_info load;
> +
> +				debug("Found FIT\n");
> +				load.dev = header;
> +				load.bl_len = 1;
> +				load.read = sdp_fit_read;
> +				spl_load_simple_fit(spl_image, &load, 0,
> +						    header);
> +
> +				return;
> +			}
> +#endif
>   			/* In SPL, allow jumps to U-Boot images */
>   			struct spl_image_info spl_image = {};
> -			spl_parse_image_header(&spl_image,
> -				(struct image_header *)sdp_func->jmp_address);
> +			spl_parse_image_header(&spl_image, header);
>   			jump_to_image_no_args(&spl_image);
>   #else
>   			/* In U-Boot, allow jumps to scripts */
> @@ -715,19 +741,22 @@ static void sdp_handle_in_ep(void)
>   	};
>   }
>   
> -void sdp_handle(int controller_index)
> +int sdp_handle(int controller_index, struct spl_image_info *spl_image)
>   {
>   	printf("SDP: handle requests...\n");
>   	while (1) {
>   		if (ctrlc()) {
>   			puts("\rCTRL+C - Operation aborted.\n");
> -			return;
> +			return -EINVAL;
>   		}
>   
> +		if (spl_image->flags & SPL_FIT_FOUND)
> +			return 0;
> +
>   		WATCHDOG_RESET();
>   		usb_gadget_handle_interrupts(controller_index);
>   
> -		sdp_handle_in_ep();
> +		sdp_handle_in_ep(spl_image);
>   	}
>   }
>   
> diff --git a/include/sdp.h b/include/sdp.h
> index f6252d027f..f30e2bca19 100644
> --- a/include/sdp.h
> +++ b/include/sdp.h
> @@ -9,7 +9,9 @@
>   #ifndef __SDP_H_
>   #define __SDP_H_
>   
> +#include <spl.h>
> +
>   int sdp_init(int controller_index);
> -void sdp_handle(int controller_index);
> +int sdp_handle(int controller_index, struct spl_image_info *spl_image);
>   
>   #endif /* __SDP_H_ */
>