Re: [Xen-devel] [PATCH v3 2/2] xen/arm: Add Marvell ARMADA 3700 early printk support

[Andre Przywara <andre.przywara@xxxxxxx>]

Hi,

On 05/04/18 11:16, Amit Singh Tomar wrote:
> Signed-off-by: Amit Singh Tomar <amittomer25@xxxxxxxxx>

Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>

Cheers,
Andre.

> ---
> Changes since v2:
>     * Addressed Andre's comments.
> Changes since v1:
>     * Removed header file dependency.
> ---
>  docs/misc/arm/early-printk.txt     |  1 +
>  xen/arch/arm/Rules.mk              |  1 +
>  xen/arch/arm/arm64/debug-mvebu.inc | 50 
> ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 52 insertions(+)
>  create mode 100644 xen/arch/arm/arm64/debug-mvebu.inc
> 
> diff --git a/docs/misc/arm/early-printk.txt b/docs/misc/arm/early-printk.txt
> index 20a8af8..f765f59 100644
> --- a/docs/misc/arm/early-printk.txt
> +++ b/docs/misc/arm/early-printk.txt
> @@ -41,6 +41,7 @@ the name of the machine:
>    - juno: printk with pl011 on Juno platform
>    - lager: printk with SCIF0 on Renesas R-Car H2 processors
>    - midway: printk with the pl011 on Calxeda Midway processors
> +  - mvebu: printk with the MVEBU for Marvell Armada 3700 SoCs
>    - omap5432: printk with UART3 on TI OMAP5432 processors
>    - rcar3: printk with SCIF2 on Renesas R-Car Gen3 processors
>    - seattle: printk with pl011 for AMD Seattle processor
> diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
> index b66c19f..f264592 100644
> --- a/xen/arch/arm/Rules.mk
> +++ b/xen/arch/arm/Rules.mk
> @@ -36,6 +36,7 @@ EARLY_PRINTK_hikey960       := pl011,0xfff32000
>  EARLY_PRINTK_juno           := pl011,0x7ff80000
>  EARLY_PRINTK_lager          := scif,0xe6e60000
>  EARLY_PRINTK_midway         := pl011,0xfff36000
> +EARLY_PRINTK_mvebu          := mvebu,0xd0012000
>  EARLY_PRINTK_omap5432       := 8250,0x48020000,2
>  EARLY_PRINTK_rcar3          := scif,0xe6e88000
>  EARLY_PRINTK_seattle        := pl011,0xe1010000
> diff --git a/xen/arch/arm/arm64/debug-mvebu.inc 
> b/xen/arch/arm/arm64/debug-mvebu.inc
> new file mode 100644
> index 0000000..3579ea6
> --- /dev/null
> +++ b/xen/arch/arm/arm64/debug-mvebu.inc
> @@ -0,0 +1,50 @@
> +/*
> + * xen/arch/arm/arm64/debug-mvebu.inc
> + *
> + * MVEBU specific debug code.
> + *
> + * Copyright (c) 2018, Amit Singh Tomar <amittomer25@xxxxxxxxx>.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms and conditions of the GNU General Public
> + * License, version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> + * License along with this program; If not, see 
> <http://www.gnu.org/licenses/>.
> + */
> +
> +#define UART_STATUS_REG     0x0c
> +#define UART_TX_REG         0x04
> +
> +/*
> + * MVEBU UART wait UART to be ready to transmit
> + * xb: register which contains the UART base address
> + * c: scratch register
> + */
> +.macro early_uart_ready xb c
> +1:
> +        ldrh   w\c, [\xb, #UART_STATUS_REG]  /* status register */
> +        tst    w\c, #(1 << 11)                        /* Check TXFIFO FULL 
> bit */
> +        b.ne   1b                            /* Wait for the UART to be 
> ready */
> +.endm
> +
> +/*
> + * MVEBU UART transmit character
> + * xb: register which contains the UART base address
> + * wt: register which contains the character to transmit
> + */
> +.macro early_uart_transmit xb wt
> +     strb  \wt, [\xb, #UART_TX_REG]
> +.endm
> +
> +/*
> + * Local variables:
> + * mode: ASM
> + * indent-tabs-mode: nil
> + * End:
> + */
> --
> 1.9.1
> 

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