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This patch implements simple hwconfig infrastructure: an interface for software knobs to control a hardware. This is very simple implementation, i.e. it is implemented via `hwconfig' environment variable. Later we could write some "hwconfig <enable|disable|list>" commands, ncurses interface for Award BIOS-like interface, and frame-buffer interface for AMI GUI[1] BIOS-like interface with mouse support[2]. Current implementation details/limitations: 1. Doesn't support options dependencies and mutual exclusion. We can implement this by integrating apt-get[3] into the u-boot. But I didn't bother yet. 2. Since we don't implement hwconfig command, i.e. we're working with the environement directly, there is no way to tell that toggling a particular option will need a reboot to take an effect. So, for now it's advised to always reboot the target after modifying hwconfig variable. 3. We support hwconfig options with arguments. For example, set hwconfig dr_usb:mode=peripheral,phy_type=ulpi That means: - dr_usb - enable Dual-Role USB controller; - dr_usb:mode=peripheral - USB in Function mode; - dr_usb:phy_type=ulpi - USB should work with ULPI PHYs; The purpose of this simple implementation is to define some internal API and then we can continue improving user experience by adding more mature interface, like hwconfig command with bells and whistles. Or not adding, if we feel that current interface fits its needs. [1] http://en.wikipedia.org/wiki/American_Megatrends [2] Regarding ncurses and GUI with mouse support -- I'm just kidding. [3] The comment regarding apt-get is also a joke, meaning that dependency tracking could be non-trivial. For example, for enabling HW feature X we may need to disable Y, and turn Z into reduced mode (like RMII-only interface for ethernet, no MII). It's quite trivial to implement simple cases though. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Acked-by: Kim Phillips <kim.phillips@freescale.com>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* An inteface for configuring a hardware via u-boot environment.
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*
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* Copyright (c) 2009 MontaVista Software, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#ifndef _HWCONFIG_H
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#define _HWCONFIG_H
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#include <linux/types.h>
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#include <asm/errno.h>
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#ifdef CONFIG_HWCONFIG
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extern int hwconfig(const char *opt);
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extern const char *hwconfig_arg(const char *opt, size_t *arglen);
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extern int hwconfig_arg_cmp(const char *opt, const char *arg);
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extern int hwconfig_sub(const char *opt, const char *subopt);
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extern const char *hwconfig_subarg(const char *opt, const char *subopt,
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size_t *subarglen);
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extern int hwconfig_subarg_cmp(const char *opt, const char *subopt,
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const char *subarg);
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#else
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static inline int hwconfig(const char *opt)
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{
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return -ENOSYS;
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}
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static inline const char *hwconfig_arg(const char *opt, size_t *arglen)
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{
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*arglen = 0;
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return "";
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}
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static inline int hwconfig_arg_cmp(const char *opt, const char *arg)
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{
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return -ENOSYS;
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}
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static inline int hwconfig_sub(const char *opt, const char *subopt)
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{
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return -ENOSYS;
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}
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static inline const char *hwconfig_subarg(const char *opt, const char *subopt,
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size_t *subarglen)
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{
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*subarglen = 0;
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return "";
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}
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static inline int hwconfig_subarg_cmp(const char *opt, const char *subopt,
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const char *subarg)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_HWCONFIG */
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#endif /* _HWCONFIG_H */
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