linux-kernel - Re: [PATCH 1/1] serial: earlycon: Add support for big-endian MMIO accesses

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Date:	Fri, 5 Jun 2015 11:00:47 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Noam Camus <noamc@...hip.com>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <linux-doc@...r.kernel.org>
CC:	<giladb@...hip.com>, <cmetcalf@...hip.com>, <cernekee@...il.com>,
	<robh@...nel.org>, <peter@...leysoftware.com>,
	<gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/1] serial: earlycon: Add support for big-endian MMIO
 accesses

On Monday 25 May 2015 09:24 AM, Noam Camus wrote:
> From: Noam Camus <noamc@...hip.com>
> 
> Support command line parameters of the form:
> earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
> 
> This commit seem to be needed even after commit:
> serial: 8250: Add support for big-endian MMIO accesses
> c627f2ceb692e8a9358b64ac2d139314e7bb0d17
> 
> Signed-off-by: Noam Camus <noamc@...hip.com>
> ---
>  Documentation/kernel-parameters.txt |    9 +++++----
>  drivers/tty/serial/earlycon.c       |    9 ++++++---
>  drivers/tty/serial/serial_core.c    |    7 +++++--
>  3 files changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 61ab162..55bb093 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -959,14 +959,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  		uart[8250],io,<addr>[,options]
>  		uart[8250],mmio,<addr>[,options]
>  		uart[8250],mmio32,<addr>[,options]
> +		uart[8250],mmio32be,<addr>[,options]
>  		uart[8250],0x<addr>[,options]
>  			Start an early, polled-mode console on the 8250/16550
>  			UART at the specified I/O port or MMIO address.
>  			MMIO inter-register address stride is either 8-bit
> -			(mmio) or 32-bit (mmio32).
> -			If none of [io|mmio|mmio32], <addr> is assumed to be
> -			equivalent to 'mmio'. 'options' are specified in the
> -			same format described for "console=ttyS<n>"; if
> +			(mmio) or 32-bit (mmio32 or mmio32be).
> +			If none of [io|mmio|mmio32|mmio32be], <addr> is assumed
> +			to be equivalent to 'mmio'. 'options' are specified
> +			in the same format described for "console=ttyS<n>"; if
>  			unspecified, the h/w is not initialized.
>  
>  		pl011,<addr>
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 5fdc9f3..a840732 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -72,6 +72,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
>  
>  	switch (port->iotype) {
>  	case UPIO_MEM32:
> +	case UPIO_MEM32BE:
>  		port->regshift = 2;	/* fall-through */
>  	case UPIO_MEM:
>  		port->mapbase = addr;
> @@ -90,9 +91,11 @@ static int __init parse_options(struct earlycon_device *device, char *options)
>  		strlcpy(device->options, options, length);
>  	}
>  
> -	if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32)
> +	if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32 ||
> +	    port->iotype == UPIO_MEM32BE)
>  		pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
> -			(port->iotype == UPIO_MEM32) ? "32" : "",
> +			(port->iotype == UPIO_MEM) ? "" :
> +			(port->iotype == UPIO_MEM32) ? "32" : "32be",
>  			(unsigned long long)port->mapbase,
>  			device->options);
>  	else
> @@ -133,7 +136,7 @@ static int __init register_earlycon(char *buf, const struct earlycon_id *match)
>   *
>   *	Registers the earlycon console matching the earlycon specified
>   *	in the param string @buf. Acceptable param strings are of the form
> - *	   <name>,io|mmio|mmio32,<addr>,<options>
> + *	   <name>,io|mmio|mmio32|mmio32be,<addr>,<options>
>   *	   <name>,0x<addr>,<options>
>   *	   <name>,<options>
>   *	   <name>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 0b7bb12..1124090 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -1816,8 +1816,8 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
>   *	@options: ptr for <options> field; NULL if not present (out)
>   *
>   *	Decodes earlycon kernel command line parameters of the form
> - *	   earlycon=<name>,io|mmio|mmio32,<addr>,<options>
> - *	   console=<name>,io|mmio|mmio32,<addr>,<options>
> + *	   earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
> + *	   console=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
>   *
>   *	The optional form
>   *	   earlycon=<name>,0x<addr>,<options>
> @@ -1835,6 +1835,9 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
>  	} else if (strncmp(p, "mmio32,", 7) == 0) {
>  		*iotype = UPIO_MEM32;
>  		p += 7;
> +	} else if (strncmp(p, "mmio32be,", 9) == 0) {
> +		*iotype = UPIO_MEM32BE;
> +		p += 9;
>  	} else if (strncmp(p, "io,", 3) == 0) {
>  		*iotype = UPIO_PORT;
>  		p += 3;
> 


Ping ! Peter, Rob, Kevin - can u please take a look.


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