[PATCH 1/4] MIPS: ath79: pbl: import AR9331 CP0 init routine from U-Boot_mod

[Yegor Yefremov]

On Thu, Feb 25, 2016 at 10:14 AM, Antony Pavlov <antonynpavlov at gmail.com> wrote:
> U-Boot_mod is a popular bootloader for Atheros AR93xx chips,
> please see https://github.com/pepe2k/u-boot_mod for details.
>
> It's reasonable to import some lowlevel AR9331 initialization
> code from U-Boot_mod.
>
> This patch imports AR9331 MIPS24K coprocessor0 initialization
> code from u-boot_mod/u-boot/cpu/mips/start_bootstrap.S.
>
> Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>

Reviewed-by: Yegor Yefremov <yegorslists at googlemail.com>

> ---
>  arch/mips/mach-ath79/include/mach/pbl_macros.h | 44 ++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
>
> diff --git a/arch/mips/mach-ath79/include/mach/pbl_macros.h b/arch/mips/mach-ath79/include/mach/pbl_macros.h
> index c00dd28..810f49d 100644
> --- a/arch/mips/mach-ath79/include/mach/pbl_macros.h
> +++ b/arch/mips/mach-ath79/include/mach/pbl_macros.h
> @@ -179,4 +179,48 @@
>                         | AR933X_GPIO_FUNC_RSRV15, GPIO_FUNC
>  .endm
>
> +.macro hornet_mips24k_cp0_setup
> +       .set push
> +       .set noreorder
> +
> +       /*
> +        * Clearing CP0 registers - This is generally required for the MIPS-24k
> +        * core used by Atheros.
> +        */
> +       mtc0    zero, CP0_INDEX
> +       mtc0    zero, CP0_ENTRYLO0
> +       mtc0    zero, CP0_ENTRYLO1
> +       mtc0    zero, CP0_CONTEXT
> +       mtc0    zero, CP0_PAGEMASK
> +       mtc0    zero, CP0_WIRED
> +       mtc0    zero, CP0_INFO
> +       mtc0    zero, CP0_COUNT
> +       mtc0    zero, CP0_ENTRYHI
> +       mtc0    zero, CP0_COMPARE
> +
> +       li      t0, ST0_CU0 | ST0_ERL
> +       mtc0    t0, CP0_STATUS
> +
> +       mtc0    zero, CP0_CAUSE
> +       mtc0    zero, CP0_EPC
> +
> +       li      t0, CONF_CM_UNCACHED
> +       mtc0    t0, CP0_CONFIG
> +
> +       mtc0    zero, CP0_LLADDR
> +       mtc0    zero, CP0_WATCHLO
> +       mtc0    zero, CP0_WATCHHI
> +       mtc0    zero, CP0_XCONTEXT
> +       mtc0    zero, CP0_FRAMEMASK
> +       mtc0    zero, CP0_DIAGNOSTIC
> +       mtc0    zero, CP0_DEBUG
> +       mtc0    zero, CP0_DEPC
> +       mtc0    zero, CP0_PERFORMANCE
> +       mtc0    zero, CP0_ECC
> +       mtc0    zero, CP0_CACHEERR
> +       mtc0    zero, CP0_TAGLO
> +
> +       .set    pop
> +.endm
> +
>  #endif /* __ASM_MACH_ATH79_PBL_MACROS_H */
> --
> 2.7.0
>