[PATCH v4 3/3] generic/starfive: Add Starfive JH7110 platform implementation

[Anup Patel]

On Tue, Dec 20, 2022 at 9:12 AM Wei Liang Lim
<weiliang.lim at starfivetech.com> wrote:
>
> Add Starfive JH7110 platform implementation
>
> Signed-off-by: Wei Liang Lim <weiliang.lim at starfivetech.com>
> Reviewed-by: Chee Hong Ang <cheehong.ang at starfivetech.com>
> Reviewed-by: Jun Liang Tan <junliang.tan at starfivetech.com>
> ---
>  platform/generic/Kconfig             |  4 ++
>  platform/generic/configs/defconfig   |  1 +
>  platform/generic/starfive/jh7110.c   | 57 ++++++++++++++++++++++++++++
>  platform/generic/starfive/objects.mk |  6 +++
>  4 files changed, 68 insertions(+)
>  create mode 100644 platform/generic/starfive/jh7110.c
>  create mode 100644 platform/generic/starfive/objects.mk
>
> diff --git a/platform/generic/Kconfig b/platform/generic/Kconfig
> index 62c7a2d..47c10e5 100644
> --- a/platform/generic/Kconfig
> +++ b/platform/generic/Kconfig
> @@ -45,4 +45,8 @@ config PLATFORM_SIFIVE_FU740
>         depends on FDT_RESET && FDT_I2C
>         default n
>
> +config PLATFORM_STARFIVE_JH7110
> +       bool "StarFive JH7110 support"
> +       default n
> +
>  endif
> diff --git a/platform/generic/configs/defconfig b/platform/generic/configs/defconfig
> index 47fca95..4b0842e 100644
> --- a/platform/generic/configs/defconfig
> +++ b/platform/generic/configs/defconfig
> @@ -3,6 +3,7 @@ CONFIG_PLATFORM_ANDES_AE350=y
>  CONFIG_PLATFORM_RENESAS_RZFIVE=y
>  CONFIG_PLATFORM_SIFIVE_FU540=y
>  CONFIG_PLATFORM_SIFIVE_FU740=y
> +CONFIG_PLATFORM_STARFIVE_JH7110=y
>  CONFIG_FDT_GPIO=y
>  CONFIG_FDT_GPIO_SIFIVE=y
>  CONFIG_FDT_I2C=y
> diff --git a/platform/generic/starfive/jh7110.c b/platform/generic/starfive/jh7110.c
> new file mode 100644
> index 0000000..5d3ab6f
> --- /dev/null
> +++ b/platform/generic/starfive/jh7110.c
> @@ -0,0 +1,57 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 StarFive
> + *
> + * Authors:
> + *   Wei Liang Lim <weiliang.lim at starfivetech.com>
> + */
> +
> +#include <libfdt.h>
> +#include <platform_override.h>
> +#include <sbi_utils/fdt/fdt_helper.h>
> +
> +static bool hart_cold_booted = FALSE;
> +
> +static bool starfive_jh7110_cold_boot_allowed(u32 hartid,
> +                                  const struct fdt_match *match)
> +{
> +       const fdt32_t *val;
> +       int len, coff;
> +
> +       if (hart_cold_booted)
> +               return FALSE;
> +
> +       void *fdt = fdt_get_address();

starfive_jh7110_cold_boot_allowed() will be called at runtime
during CPU hotplug or CPU non-retentive suspend so don't
access FDT in this function because it might have been
corrupted/over-written by S-mode software.

You can save data from FDT in starfive_jh7110_early_init()
when cold_boot == TRUE.

Regards,
Anup

> +
> +       coff = fdt_path_offset(fdt, "/chosen");
> +       if (-1 < coff) {
> +               val = fdt_getprop(fdt, coff, "boot-hart", &len);
> +               if (val && len) {
> +                       u32 selected_hartid = (u32) fdt32_to_cpu(*val);
> +                       return (selected_hartid == hartid);
> +               }
> +       }
> +
> +       return TRUE;
> +}
> +
> +static int starfive_jh7110_early_init(bool cold_boot,
> +                                  const struct fdt_match *match)
> +{
> +       if (cold_boot)
> +               hart_cold_booted = TRUE;
> +
> +       return 0;
> +}
> +
> +static const struct fdt_match starfive_jh7110_match[] = {
> +       { .compatible = "starfive,jh7110" },
> +       { },
> +};
> +
> +const struct platform_override starfive_jh7110 = {
> +       .match_table = starfive_jh7110_match,
> +       .early_init = starfive_jh7110_early_init,
> +       .cold_boot_allowed = starfive_jh7110_cold_boot_allowed,
> +};
> diff --git a/platform/generic/starfive/objects.mk b/platform/generic/starfive/objects.mk
> new file mode 100644
> index 0000000..0b900fb
> --- /dev/null
> +++ b/platform/generic/starfive/objects.mk
> @@ -0,0 +1,6 @@
> +#
> +# SPDX-License-Identifier: BSD-2-Clause
> +#
> +
> +carray-platform_override_modules-$(CONFIG_PLATFORM_STARFIVE_JH7110) += starfive_jh7110
> +platform-objs-$(CONFIG_PLATFORM_STARFIVE_JH7110) += starfive/jh7110.o
> --
> 2.25.1
>