Re: [PATCH 4/4] arm: mediatek: Add earlyprintk support for MT6589
From: Gregory CLEMENT
Date: Wed Apr 09 2014 - 16:54:25 EST
Hi Matthias,
On 09/04/2014 19:45, Matthias Brugger wrote:
> Signed-off-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> ---
> arch/arm/Kconfig.debug | 49 +++++++++++++++++++++++++++++++++++--
> arch/arm/include/debug/mediatek.S | 38 ++++++++++++++++++++++++++++
> 2 files changed, 85 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm/include/debug/mediatek.S
>
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index 4a2fc0b..dc51495 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -797,6 +797,38 @@ choice
> Say Y here if you want kernel low-level debugging support
> on Ux500 based platforms.
>
> + config DEBUG_MTK6589_UART0
> + depends on ARCH_MEDIATEK
> + bool "Mediatek mt6589 UART0"
> + select DEBUG_UART_MEDIATEK
> + help
> + Say Y here if you want kernel low-level debugging support
> + on Mediatek mt6589 based platforms.
> +
> + config DEBUG_MTK6589_UART1
> + depends on ARCH_MEDIATEK
> + bool "Mediatek mt6589 UART1"
> + select DEBUG_UART_MEDIATEK
> + help
> + Say Y here if you want kernel low-level debugging support
> + on Mediatek mt6589 based platforms.
> +
> + config DEBUG_MTK6589_UART2
> + depends on ARCH_MEDIATEK
> + bool "Mediatek mt6589 UART2"
> + select DEBUG_UART_MEDIATEK
> + help
> + Say Y here if you want kernel low-level debugging support
> + on Mediatek mt6589 based platforms.
> +
> + config DEBUG_MTK6589_UART3
> + depends on ARCH_MEDIATEK
> + bool "Mediatek mt6589 UART3"
> + select DEBUG_UART_MEDIATEK
> + help
> + Say Y here if you want kernel low-level debugging support
> + on Mediatek mt6589 based platforms.
> +
> config DEBUG_VEXPRESS_UART0_DETECT
> bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
> depends on ARCH_VEXPRESS && CPU_CP15_MMU
> @@ -954,6 +986,10 @@ config DEBUG_MSM_UART
> bool
> depends on ARCH_MSM || ARCH_QCOM
>
> +config DEBUG_UART_MEDIATEK
> + bool
> + depends on ARCH_MEDIATEK
> +
> config DEBUG_LL_INCLUDE
> string
> default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
> @@ -971,6 +1007,7 @@ config DEBUG_LL_INCLUDE
> DEBUG_IMX53_UART ||\
> DEBUG_IMX6Q_UART || \
> DEBUG_IMX6SL_UART
> + default "debug/mediatek.S" if DEBUG_UART_MEDIATEK
> default "debug/msm.S" if DEBUG_MSM_UART
> default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
> default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
> @@ -1043,6 +1080,10 @@ config DEBUG_UART_PHYS
> default 0xd0012000 if DEBUG_MVEBU_UART
> default 0xd4017000 if DEBUG_MMP_UART2
> default 0xd4018000 if DEBUG_MMP_UART3
it seems that this symbol are sorted by address so your symbols
should go just after the line
default 0x101fb000 if DEBUG_NOMADIK_UART
> + default 0x11006000 if DEBUG_MTK6589_UART0
> + default 0x11007000 if DEBUG_MTK6589_UART1
> + default 0x11008000 if DEBUG_MTK6589_UART2
> + default 0x11009000 if DEBUG_MTK6589_UART3
> default 0xe0000000 if ARCH_SPEAR13XX
> default 0xf0000be0 if ARCH_EBSA110
> default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
> @@ -1058,7 +1099,7 @@ config DEBUG_UART_PHYS
> default 0xfffff700 if ARCH_IOP33X
> depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
> DEBUG_LL_UART_EFM32 || \
> - DEBUG_UART_8250 || DEBUG_UART_PL01X
> + DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_UART_MEDIATEK
>
> config DEBUG_UART_VIRT
> hex "Virtual base address of debug UART"
> @@ -1087,6 +1128,10 @@ config DEBUG_UART_VIRT
> default 0xfe012000 if ARCH_ORION5X
> default 0xfe017000 if DEBUG_MMP_UART2
> default 0xfe018000 if DEBUG_MMP_UART3
> + default 0xF1006000 if DEBUG_MTK6589_UART0
> + default 0xF1007000 if DEBUG_MTK6589_UART1
> + default 0xF1008000 if DEBUG_MTK6589_UART2
> + default 0xF1009000 if DEBUG_MTK6589_UART3
> default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
> default 0xfe230000 if DEBUG_PICOXCELL_UART
> default 0xfe300000 if DEBUG_BCM_KONA_UART
> @@ -1116,7 +1161,7 @@ config DEBUG_UART_VIRT
> default 0xff003000 if DEBUG_U300_UART
> default DEBUG_UART_PHYS if !MMU
> depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
> - DEBUG_UART_8250 || DEBUG_UART_PL01X
> + DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_UART_MEDIATEK
>
> config DEBUG_UART_8250_SHIFT
> int "Register offset shift for the 8250 debug UART"
> diff --git a/arch/arm/include/debug/mediatek.S b/arch/arm/include/debug/mediatek.S
> new file mode 100644
> index 0000000..98e8414
> --- /dev/null
> +++ b/arch/arm/include/debug/mediatek.S
> @@ -0,0 +1,38 @@
> +/*
> + * Low-level debug macro for Mediatek SoCs
> + *
> + * Copyright (c) 2014 MundoReader S.L.
> + * Author: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * 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.
> + */
> +#include <linux/serial_reg.h>
> +
> + .macro addruart, rp, rv, tmp
> + ldr \rp, =CONFIG_DEBUG_UART_PHYS
> + ldr \rv, =CONFIG_DEBUG_UART_VIRT
> + .endm
> +
> + .macro senduart,rd,rx
> + strb \rd, [\rx, #0x0]
What about using a #define instead of numerical value?
> + .endm
> +
> + .macro waituart,rd,rx
> +1001: ldr \rd, [\rx, #0x14]
ditto
> + tst \rd, #0x40
ditto
> + beq 1001b
> + .endm
> +
> + .macro busyuart,rd,rx
> +1002: ldr \rd, [\rx, #0x14]
ditto
> + tst \rd, #0x40
ditto
> + beq 1002b
> + .endm
>
This file looks very similar to arch/arm/include/debug/pl01x.S,
the only difference is the value of some register offsets.
Should it be possible to make it configurable and then use the
same file?
Thanks,
Gregory
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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