[PATCH v7 2/7] fpga: add fit_fpga_load function

[Oleksandr Suvorov]

Hi Adrian,

On Wed, May 4, 2022 at 5:28 PM Adrian Fiergolski
<adrian.fiergolski at fastree3d.com> wrote:
>
> Hi Oleksandr,
>
> On 03.05.2022 09:42, Michal Simek wrote:
> >
> >
> > On 4/11/22 20:00, Adrian Fiergolski wrote:
> >> From: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> >>
> >> Introduce a function which passes an fpga compatible string from
> >> FIT images to FPGA drivers. This lets the different implementations
> >> decide how to handle it.
> >>
> >> Some code of Jorge Ramirez-Ortiz <jorge at foundries.io> is reused.
> >>
> >> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> >> Tested-by: Ricardo Salveti <ricardo at foundries.io>
> >> Co-developed-by: Adrian Fiergolski <adrian.fiergolski at fastree3d.com>
> >> Signed-off-by: Adrian Fiergolski <adrian.fiergolski at fastree3d.com>
> >> ---
> >>   common/spl/spl_fit.c |  6 ++----
> >>   drivers/fpga/fpga.c  | 23 ++++++++++++++++++++++-
> >>   include/fpga.h       |  4 ++++
> >>   3 files changed, 28 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
> >> index 1bbf824684..0e3c2a94b6 100644
> >> --- a/common/spl/spl_fit.c
> >> +++ b/common/spl/spl_fit.c
> >> @@ -588,11 +588,9 @@ static int spl_fit_upload_fpga(struct
> >> spl_fit_info *ctx, int node,
> >>       compatible = fdt_getprop(ctx->fit, node, "compatible", NULL);
> >>       if (!compatible)
> >>           warn_deprecated("'fpga' image without 'compatible' property");
> >> -    else if (strcmp(compatible, "u-boot,fpga-legacy"))
> >> -        printf("Ignoring compatible = %s property\n", compatible);
> >>   -    ret = fpga_load(0, (void *)fpga_image->load_addr,
> >> fpga_image->size,
> >> -            BIT_FULL);
> >> +    ret = fit_fpga_load(0, (void *)fpga_image->load_addr,
> >> fpga_image->size,
> >> +                BIT_FULL, compatible);
> >>       if (ret) {
> >>           printf("%s: Cannot load the image to the FPGA\n", __func__);
> >>           return ret;
> >> diff --git a/drivers/fpga/fpga.c b/drivers/fpga/fpga.c
> >> index 3b0a44b242..a306dd81f9 100644
> >> --- a/drivers/fpga/fpga.c
> >> +++ b/drivers/fpga/fpga.c
> >> @@ -249,8 +249,23 @@ int fpga_loads(int devnum, const void *buf,
> >> size_t size,
> >>   }
> >>   #endif
> >>   +int fit_fpga_load(int devnum, const void *buf, size_t bsize,
> >> +          bitstream_type bstype, const char *compatible)
> >> +{
> >> +    fpga_desc *desc = fpga_get_desc(devnum);
> >
> > this generates warning which you should fix.
> >
> > +  fpga_desc *desc = fpga_get_desc(devnum);
> > +                    ^~~~~~~~~~~~~
> > w+../drivers/fpga/fpga.c: In function ‘fit_fpga_load’:
> > w+../drivers/fpga/fpga.c:255:20: warning: initialization discards
> > ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
>
> As it's your patch, could you address it?
>
> The 'compatible' field can't be set here, as fpga_get_desc returns
> 'const fpga_desc * const'. The descriptors table is populated (fpga_add)
> in board_init. At that stage, I am afraid, we don't have access to the
> fit image information yet to set a proper 'compatible' (would need to
> check the code more carefully). Moreover, IMHO it's not the cleanest way
> to change the 'compatible' field after the driver's initialisation.

Obviously, the "compatible" attribute belongs to an image, not to an FPGA
driver. Unfortunately, I don't see an easy way to stick this attribute to an
image in the current architecture. Maybe I missed that way, so I'd appreciate
any help with this.

Anyway, we could come back to the FPGA driver subsystem later and rework
it better and deeper.

For now, I'd only fix the warning. Are you ok with this?

> >
> >
> >> +
> >> +    /*
> >> +     * Store the compatible string to proceed it in underlying
> >> +     * functions
> >> +     */
> >> +    desc->compatible = (char *)compatible;
> >> +
> >> +    return fpga_load(devnum, buf, bsize, bstype);
> >> +}
> >> +
> >>   /*
> >> - * Generic multiplexing code
> >> + * Generic multiplexing code:
> >> + * Each architecture must handle the mandatory FPGA DT compatible
> >> property.
> >>    */
> >>   int fpga_load(int devnum, const void *buf, size_t bsize,
> >> bitstream_type bstype)
> >>   {
> >> @@ -270,6 +285,9 @@ int fpga_load(int devnum, const void *buf, size_t
> >> bsize, bitstream_type bstype)
> >>               break;
> >>           case fpga_altera:
> >>   #if defined(CONFIG_FPGA_ALTERA)
> >> +            if (strncmp(desc->compatible, "u-boot,fpga-legacy", 18))
> >> +                printf("Ignoring compatible = %s property\n",
> >> +                       desc->compatible);
> >>               ret_val = altera_load(desc->devdesc, buf, bsize);
> >>   #else
> >>               fpga_no_sup((char *)__func__, "Altera devices");
> >> @@ -277,6 +295,9 @@ int fpga_load(int devnum, const void *buf, size_t
> >> bsize, bitstream_type bstype)
> >>               break;
> >>           case fpga_lattice:
> >>   #if defined(CONFIG_FPGA_LATTICE)
> >> +            if (strncmp(desc->compatible, "u-boot,fpga-legacy", 18))
> >> +                printf("Ignoring compatible = %s property\n",
> >> +                       desc->compatible);
> >>               ret_val = lattice_load(desc->devdesc, buf, bsize);
> >>   #else
> >>               fpga_no_sup((char *)__func__, "Lattice devices");
> >> diff --git a/include/fpga.h b/include/fpga.h
> >> index ec5144334d..2891f32106 100644
> >> --- a/include/fpga.h
> >> +++ b/include/fpga.h
> >> @@ -35,6 +35,7 @@ typedef enum {            /* typedef fpga_type */
> >>   typedef struct {        /* typedef fpga_desc */
> >>       fpga_type devtype;    /* switch value to select sub-functions */
> >>       void *devdesc;        /* real device descriptor */
> >> +    char *compatible;    /* device compatible string */
> >>   } fpga_desc;            /* end, typedef fpga_desc */
> >>     typedef struct {                /* typedef fpga_desc */
> >> @@ -63,6 +64,9 @@ int fpga_add(fpga_type devtype, void *desc);
> >>   int fpga_count(void);
> >>   const fpga_desc *const fpga_get_desc(int devnum);
> >>   int fpga_is_partial_data(int devnum, size_t img_len);
> >> +/* the DT compatible property must be handled by the different FPGA
> >> archs */
> >> +int fit_fpga_load(int devnum, const void *buf, size_t bsize,
> >> +          bitstream_type bstype, const char *compatible);
> >>   int fpga_load(int devnum, const void *buf, size_t bsize,
> >>             bitstream_type bstype);
> >>   int fpga_fsload(int devnum, const void *buf, size_t size,
> >
> > M
> Adrian



--
Best regards
Oleksandr

Oleksandr Suvorov
cryosay at gmail.com