linux-kernel - Re: [PATCH] ARM: at91: debug: use DEBUG_UART

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Message-ID: <20150918221323.GK4287@piout.net>
Date:	Sat, 19 Sep 2015 00:13:23 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: at91: debug: use DEBUG_UART_PHYS

Hi,

On 18/09/2015 at 16:48:43 +0200, Nicolas Ferre wrote :
> > -	config AT91_DEBUG_LL_DBGU1
> > -		bool "Kernel low-level debugging on 9263, 9g45 and sama5d3"
> > -		select DEBUG_AT91_UART
> > -		depends on ARCH_AT91
> > -		depends on SOC_AT91SAM9 || SOC_SAMA5
> > +		  SOC                  DEBUG_UART_PHYS   DEBUG_UART_VIRT  PORT
> > +		  rm9200, 9260/9g20,   0xfffff200        0xfefff200       DBGU
> > +		  9261/9g10, 9rl
> > +		  9263, 9g45, sama5d3  0xffffee00        0xfeffee00       DBGU
> > +		  sama5d4              0xfc00c000        0xfb00c000       USART3
> > +		  sama5d4              0xfc069000        0xfb069000       DBGU
> 
> This last one must be sama5d3, mustn't it?
> 

No, that is the DBGU for sama5d4, sama5d3 is mentionned and is at
0xffffee00. I added it in case someone doesn't use USART3 for debugging
and wants to use the DBGU. I actually doubt it may happen but we never
now. I can remove it in a v2 if you prefer.

> Otherwise I'm okay:
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> 
> > +		  sama5d2              0xf8020000        0xf7020000       UART1
> >  
> > -	config AT91_DEBUG_LL_DBGU2
> > -		bool "Kernel low-level debugging on sama5d4"
> > -		select DEBUG_AT91_UART
> > -		depends on ARCH_AT91
> > -		depends on SOC_SAMA5
> > -
> > -	config AT91_DEBUG_LL_DBGU3
> > -		bool "Kernel low-level debugging on sama5d2"
> > -		select DEBUG_AT91_UART
> > -		depends on ARCH_AT91
> > -		depends on SOC_SAMA5
> > +		  Please adjust DEBUG_UART_PHYS configuration options based on
> > +		  your needs.
> >  
> >  	config DEBUG_BCM2835
> >  		bool "Kernel low-level debugging on BCM2835 PL011 UART"
> > @@ -1242,10 +1236,6 @@ choice
> >  
> >  endchoice
> >  
> > -config DEBUG_AT91_UART
> > -	bool
> > -	depends on ARCH_AT91
> > -
> >  config DEBUG_EXYNOS_UART
> >  	bool
> >  
> > @@ -1476,7 +1466,8 @@ config DEBUG_UART_PHYS
> >  		DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \
> >  		DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \
> >  		DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \
> > -		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0
> > +		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
> > +		DEBUG_AT91_UART
> >  
> >  config DEBUG_UART_VIRT
> >  	hex "Virtual base address of debug UART"
> > diff --git a/arch/arm/include/debug/at91.S b/arch/arm/include/debug/at91.S
> > index 2556a8801c8c..43243be94cfc 100644
> > --- a/arch/arm/include/debug/at91.S
> > +++ b/arch/arm/include/debug/at91.S
> > @@ -9,32 +9,22 @@
> >   *
> >  */
> >  
> > -#if defined(CONFIG_AT91_DEBUG_LL_DBGU0)
> > -#define AT91_DBGU 0xfffff200 /* AT91_BASE_DBGU0 */
> > -#elif defined(CONFIG_AT91_DEBUG_LL_DBGU1)
> > -#define AT91_DBGU 0xffffee00 /* AT91_BASE_DBGU1 */
> > -#elif defined(CONFIG_AT91_DEBUG_LL_DBGU2)
> > -/* On sama5d4, use USART3 as low level serial console */
> > -#define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
> > -#else
> > -/* On sama5d2, use UART1 as low level serial console */
> > -#define AT91_DBGU 0xf8020000
> > -#endif
> > -
> >  #ifdef CONFIG_MMU
> >  #define AT91_IO_P2V(x) ((x) - 0x01000000)
> >  #else
> >  #define AT91_IO_P2V(x) (x)
> >  #endif
> >  
> > +#define CONFIG_DEBUG_UART_VIRT AT91_IO_P2V(CONFIG_DEBUG_UART_PHYS)
> > +
> >  #define AT91_DBGU_SR		(0x14)	/* Status Register */
> >  #define AT91_DBGU_THR		(0x1c)	/* Transmitter Holding Register */
> >  #define AT91_DBGU_TXRDY		(1 << 1)	/* Transmitter Ready */
> >  #define AT91_DBGU_TXEMPTY	(1 << 9)	/* Transmitter Empty */
> >  
> >  	.macro	addruart, rp, rv, tmp
> > -	ldr	\rp, =AT91_DBGU				@ System peripherals (phys address)
> > -	ldr	\rv, =AT91_IO_P2V(AT91_DBGU)		@ System peripherals (virt address)
> > +	ldr	\rp, =CONFIG_DEBUG_UART_PHYS		@ System peripherals (phys address)
> > +	ldr	\rv, =CONFIG_DEBUG_UART_VIRT		@ System peripherals (virt address)
> >  	.endm
> >  
> >  	.macro	senduart,rd,rx
> > 
> 
> 
> -- 
> Nicolas Ferre

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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