linux-kernel - Re: [PATCH 3/7] of: Fix uart16550 initialization on little-endian systems

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Date:	Wed, 29 Sep 2010 15:29:45 +0900
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Michal Simek <monstr@...str.eu>
Cc:	linux-kernel@...r.kernel.org, john.williams@...alogix.com,
	edgar.iglesias@...il.com, duyl@...inx.com, linnj@...inx.com,
	microblaze-uclinux@...e.uq.edu.au,
	"David S. Miller" <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 3/7] of: Fix uart16550 initialization on little-endian
 systems

On Wed, Sep 29, 2010 at 03:52:14PM +1000, Michal Simek wrote:
> Convert values from big-endian to cpu-endian.
> 
> Signed-off-by: Michal Simek <monstr@...str.eu>
> CC: Grant Likely <grant.likely@...retlab.ca>
> CC: "David S. Miller" <davem@...emloft.net>
> CC: Tejun Heo <tj@...nel.org>
> CC: linux-kernel@...r.kernel.org
> CC: devicetree-discuss@...ts.ozlabs.org

Applied, thanks.

g.

> ---
>  drivers/serial/of_serial.c |   17 ++++++++++-------
>  1 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c
> index 2af8fd1..0e4d894 100644
> --- a/drivers/serial/of_serial.c
> +++ b/drivers/serial/of_serial.c
> @@ -31,17 +31,19 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
>  {
>  	struct resource resource;
>  	struct device_node *np = ofdev->dev.of_node;
> -	const unsigned int *clk, *spd;
> +	const unsigned int *spd;
> +	unsigned int clk;
>  	const u32 *prop;
>  	int ret, prop_size;
>  
>  	memset(port, 0, sizeof *port);
>  	spd = of_get_property(np, "current-speed", NULL);
> -	clk = of_get_property(np, "clock-frequency", NULL);
> -	if (!clk) {
> +	prop = of_get_property(np, "clock-frequency", NULL);
> +	if (!prop) {
>  		dev_warn(&ofdev->dev, "no clock-frequency property set\n");
>  		return -ENODEV;
>  	}
> +	clk = be32_to_cpup(prop);
>  
>  	ret = of_address_to_resource(np, 0, &resource);
>  	if (ret) {
> @@ -55,23 +57,24 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
>  	/* Check for shifted address mapping */
>  	prop = of_get_property(np, "reg-offset", &prop_size);
>  	if (prop && (prop_size == sizeof(u32)))
> -		port->mapbase += *prop;
> +		port->mapbase += be32_to_cpup(prop);
>  
>  	/* Check for registers offset within the devices address range */
>  	prop = of_get_property(np, "reg-shift", &prop_size);
>  	if (prop && (prop_size == sizeof(u32)))
> -		port->regshift = *prop;
> +		port->regshift = be32_to_cpup(prop);
>  
>  	port->irq = irq_of_parse_and_map(np, 0);
>  	port->iotype = UPIO_MEM;
>  	port->type = type;
> -	port->uartclk = *clk;
> +	port->uartclk = clk;
>  	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
>  		| UPF_FIXED_PORT | UPF_FIXED_TYPE;
>  	port->dev = &ofdev->dev;
> +
>  	/* If current-speed was set, then try not to change it. */
>  	if (spd)
> -		port->custom_divisor = *clk / (16 * (*spd));
> +		port->custom_divisor = clk / (16 * be32_to_cpup(spd));
>  
>  	return 0;
>  }
> -- 
> 1.5.5.1
> 
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