linux-kernel - Re: [PATCH 11/12] unicore32 machine related files: ps2 driver

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Message-Id: <201102171803.15785.arnd@arndb.de>
Date:	Thu, 17 Feb 2011 18:03:15 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"'Greg KH'" <greg@...ah.com>
Subject: Re: [PATCH 11/12] unicore32 machine related files: ps2 driver

On Wednesday 16 February 2011, Guan Xuetao wrote:
> +/*
> + * Register numbers.
> + */
> +#define I8042_COMMAND_REG      ((unsigned long)&PS2_COMMAND)
> +#define I8042_STATUS_REG       ((unsigned long)&PS2_STATUS)
> +#define I8042_DATA_REG         ((unsigned long)&PS2_DATA)
> +
> +static inline int i8042_read_data(void)
> +{
> +       return inb(I8042_DATA_REG);
> +}
> +
> +static inline int i8042_read_status(void)
> +{
> +       return inb(I8042_STATUS_REG);
> +}
> +

This is not a correct way to use inb()/outb(), as far as I can tell:
PS2_COMMAND is an mmio pointer (or should be, see my other message).

inb() however is only defined on PCI/ISA PIO port numbers, which
are in the range between 0 and 65535, and typically get mapped
into the memory from the PCI driver.

	Arnd
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