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Date: Wed, 10 Apr 2019 12:19:38 +0200
From: Clément Péron <peron.clem@...il.com>
To: Erwan Le Ray <erwan.leray@...com>
Cc: Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
Kevin Hilman <khilman@...libre.com>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-stm32@...md-mailman.stormreply.com,
Russell King <linux@...linux.org.uk>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...com>,
Clement Peron <clement.peron@...ialet.com>,
Simon Horman <horms+renesas@...ge.net.au>,
Stefan Agner <stefan@...er.ch>,
Biju Das <biju.das@...renesas.com>,
Gerald Baeza <gerald.baeza@...com>,
Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
Clement Peron <peron.clem@...il.com>,
Bich Hemon <bich.hemon@...com>,
Fabrice Gasnier <fabrice.gasnier@...com>
Subject: Re: [PATCH] ARM: debug: stm32: add UART early console configuration
Hi,
On Wed, 10 Apr 2019 at 10:03, Erwan Le Ray <erwan.leray@...com> wrote:
>
> - This patch allows to configure UART instance for early console by setting
> physical and virtual base addresses.
> - This patch adds UART early console support for stm32h7 and stm32mp157c.
*Newbie kernel speaking*
I think this patch introduce at least 2, I will go for 3 modifications:
-Adding H7 Debug
-Adding MP1 debug
-(Fixing dependencies F4/F7)
With my little knowledge, I will separate this patch in 3.
Also try to have a commit log like this :
1) Explain What's wrong or is not present
2) Explain what you do in the patch
here you don't explain a lot what the issues are.
My 2cts on your patch, again newbie user here and I have post only few
patches but this is my sharing.
Thanks,
Clement
>
> Signed-off-by: Erwan Le Ray <erwan.leray@...com>
>
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index 6d6e033..4ea3e17 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -1201,23 +1201,49 @@ choice
>
> config STM32F4_DEBUG_UART
> bool "Use STM32F4 UART for low-level debug"
> - depends on ARCH_STM32
> + depends on MACH_STM32F429 || MACH_STM32F469
> select DEBUG_STM32_UART
> help
> Say Y here if you want kernel low-level debugging support
> on STM32F4 based platforms, which default UART is wired on
> - USART1.
> + USART1, but another UART instance can be selected by modifying
> + CONFIG_DEBUG_UART_PHYS.
>
> If unsure, say N.
>
> config STM32F7_DEBUG_UART
> bool "Use STM32F7 UART for low-level debug"
> - depends on ARCH_STM32
> + depends on MACH_STM32F746 || MACH_STM32F769
> select DEBUG_STM32_UART
> help
> Say Y here if you want kernel low-level debugging support
> on STM32F7 based platforms, which default UART is wired on
> - USART1.
> + USART1, but another UART instance can be selected by modifying
> + CONFIG_DEBUG_UART_PHYS.
> +
> + If unsure, say N.
> +
> + config STM32H7_DEBUG_UART
> + bool "Use STM32H7 UART for low-level debug"
> + depends on MACH_STM32H743
> + select DEBUG_STM32_UART
> + help
> + Say Y here if you want kernel low-level debugging support
> + on STM32H7 based platforms, which default UART is wired on
> + USART1, but another UART instance can be selected by modifying
> + CONFIG_DEBUG_UART_PHYS.
> +
> + If unsure, say N.
> +
> + config STM32MP1_DEBUG_UART
> + bool "Use STM32MP1 UART for low-level debug"
> + depends on MACH_STM32MP157
> + select DEBUG_STM32_UART
> + help
> + Say Y here if you want kernel low-level debugging support
> + on STM32MP1 based platforms, wich default UART is wired on
> + UART4, but another UART instance can be selected by modifying
> + CONFIG_DEBUG_UART_PHYS and CONFIG_DEBUG_UART_VIRT.
>
> If unsure, say N.
>
> @@ -1622,6 +1648,9 @@ config DEBUG_UART_PHYS
> default 0x3e000000 if DEBUG_BCM_KONA_UART
> default 0x3f201000 if DEBUG_BCM2836
> default 0x4000e400 if DEBUG_LL_UART_EFM32
> + default 0x40010000 if STM32MP1_DEBUG_UART
> + default 0x40011000 if STM32F4_DEBUG_UART || STM32F7_DEBUG_UART || \
> + STM32H7_DEBUG_UART
> default 0x40028000 if DEBUG_AT91_SAMV7_USART1
> default 0x40081000 if DEBUG_LPC18XX_UART0
> default 0x40090000 if DEBUG_LPC32XX
> @@ -1716,7 +1745,7 @@ config DEBUG_UART_PHYS
> DEBUG_S3C64XX_UART || \
> DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
> DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
> - DEBUG_AT91_UART
> + DEBUG_AT91_UART || DEBUG_STM32_UART
>
> config DEBUG_UART_VIRT
> hex "Virtual base address of debug UART"
> @@ -1784,6 +1813,7 @@ config DEBUG_UART_VIRT
> default 0xfd012000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_MV78XX0
> default 0xfd883000 if DEBUG_ALPINE_UART0
> default 0xfde12000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_DOVE
> + default 0xfe010000 if STM32MP1_DEBUG_UART
> default 0xfe012000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_ORION5X
> default 0xfe017000 if DEBUG_MMP_UART2
> default 0xfe018000 if DEBUG_MMP_UART3
> @@ -1832,7 +1862,7 @@ config DEBUG_UART_VIRT
> DEBUG_S3C64XX_UART || \
> DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
> DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
> - DEBUG_AT91_UART
> + DEBUG_AT91_UART || DEBUG_STM32_UART
>
> config DEBUG_UART_8250_SHIFT
> int "Register offset shift for the 8250 debug UART"
> diff --git a/arch/arm/include/debug/stm32.S b/arch/arm/include/debug/stm32.S
> index 1abb32f..6446e46 100644
> --- a/arch/arm/include/debug/stm32.S
> +++ b/arch/arm/include/debug/stm32.S
> @@ -4,14 +4,13 @@
> * Author: Gerald Baeza <gerald.baeza@...com> for STMicroelectronics.
> */
>
> -#define STM32_UART_BASE 0x40011000 /* USART1 */
> -
> #ifdef CONFIG_STM32F4_DEBUG_UART
> #define STM32_USART_SR_OFF 0x00
> #define STM32_USART_TDR_OFF 0x04
> #endif
>
> -#ifdef CONFIG_STM32F7_DEBUG_UART
> +#if defined(CONFIG_STM32F7_DEBUG_UART) || (CONFIG_STM32H7_DEBUG_UART) || \
> + defined(CONFIG_STM32MP1_DEBUG_UART)
> #define STM32_USART_SR_OFF 0x1C
> #define STM32_USART_TDR_OFF 0x28
> #endif
> @@ -20,8 +19,8 @@
> #define STM32_USART_TXE (1 << 7) /* Tx data reg empty */
>
> .macro addruart, rp, rv, tmp
> - ldr \rp, =STM32_UART_BASE @ physical base
> - ldr \rv, =STM32_UART_BASE @ virt base /* NoMMU */
> + ldr \rp, =CONFIG_DEBUG_UART_PHYS @ physical base
> + ldr \rv, =CONFIG_DEBUG_UART_VIRT @ virt base
> .endm
>
> .macro senduart,rd,rx
> --
> 1.9.1
>
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