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Initial version of a generic RAM initialization framework.

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Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Peter Stuge <peter@stuge.se>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@338 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Uwe Hermann 2007-05-28 14:34:05 +00:00
commit 3fcf95e1a2
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lib/ram.c Normal file
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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2007 Ronald G. Minnich <rminnich@gmail.com>
* Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <hlt.h>
/**
* Print an error message which says why the RAM initialization failed,
* then halt the processor(s).
*
* @param why The reason why the RAM initialization failed.
*/
void ram_failure(const char *why)
{
printk(BIOS_EMERG, "RAM failure: %s: Halting\n", why);
hlt();
}
/**
* ram_initialize() is is the main RAM init function.
*
* It sets basic registers that can not be detected, then does the SPD step.
* Mainboards and other code can skip one of these steps by the expedient
* of making it an empty function.
*
* @param controllers How many memory controllers there are.
* @param ctrl Pointer to the mem control structure.
* @param sysinfo Not used on all targets. NULL if not used. This function
* does nothing with sysinfo but pass it on.
*/
void ram_initialize(int controllers, const struct mem_controller *ctrl,
void *sysinfo)
{
int i;
/* Set the registers we can set once to reasonable values. */
for (i = 0; i < controllers; i++) {
printk(BIOS_INFO,
"Setting registers of RAM controller %d\n", i);
ram_set_registers(ctrl + i, sysinfo);
}
/* Now setup those things we can auto detect. */
for (i = 0; i < controllers; i++) {
printk(BIOS_INFO,
"Setting SPD based registers of RAM controller %d\n", i);
ram_set_spd_registers(ctrl + i, sysinfo);
}
/* Now that everything is setup enable the RAM. Some chipsets do
* the work for us while on others we need to it by hand.
*/
printk(BIOS_DEBUG, "Enabling RAM\n");
ram_enable(controllers, ctrl, sysinfo);
/* RAM initialization is done. */
printk(BIOS_DEBUG, "RAM enabled successfully\n");
}