mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
d3799020d5
- Don't make write_phys/read_phys static, they can be useful elsewhere. - Rename write_phys/read_phys to ram_write_phys/ram_read_phys for consistency with the other RAM-related functions. - Simplify some parts of the code a bit. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Ronald G. Minnich <rminnich@gmail.com> git-svn-id: svn://coreboot.org/repository/coreboot-v3@635 f3766cd6-281f-0410-b1cd-43a5c92072e9
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2001 Tyson Sawyer, irobot
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* Copyright (C) 2008 Ronald G. Minnich
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <types.h>
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#include <lib.h>
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#include <console.h>
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/**
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* Write a value into memory.
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*
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* @param addr The memory address to write to.
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* @param value The value to write into the specified memory address.
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*/
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void ram_write_phys(unsigned long addr, unsigned long value)
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{
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volatile unsigned long *ptr;
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ptr = (void *)addr;
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*ptr = value;
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}
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/**
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* Read a value from memory.
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*
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* @param addr The memory address to read from.
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* @return The value read from the specified memory address.
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*/
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unsigned long ram_read_phys(unsigned long addr)
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{
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volatile unsigned long *ptr;
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ptr = (void *)addr;
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return *ptr;
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}
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/**
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* Fill the specified RAM area.
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*
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* The data which is written into RAM is the address of each memory location.
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* E.g., we write a value of 0x1234 into address 0x1234, we write 0x1235 into
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* memory address 0x1235, and so on.
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*
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* @param start The beginning of the RAM area.
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* @param stop The end of the RAM area.
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*/
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static void ram_fill(unsigned long start, unsigned long stop)
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{
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unsigned long addr;
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printk(BIOS_DEBUG, "DRAM fill: %lx-%lx\n", start, stop);
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for (addr = start; addr < stop; addr += 4) {
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/* Display address being filled. */
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if (!(addr & 0xffff))
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printk(BIOS_DEBUG, "%lx\r", addr);
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ram_write_phys(addr, addr);
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};
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/* Display final address. */
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printk(BIOS_DEBUG, "%lx\nDRAM filled.\n", addr);
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}
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/**
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* Verify the specified RAM area.
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*
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* This checks whether the specified RAM locations return the "correct" data
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* as written by ram_fill(). The value at address 0x1234 for example should
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* be 0x1234, the value of address 0x1235 should be 0x1235, and so on.
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*
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* @param start The beginning of the RAM area.
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* @param stop The end of the RAM area.
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*/
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static void ram_verify(unsigned long start, unsigned long stop)
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{
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unsigned long addr, value;
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int i = 0;
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printk(BIOS_DEBUG, "DRAM verify: %lx-%lx\n", start, stop);
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for (addr = start; addr < stop; addr += 4) {
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/* Display address being tested. */
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if (!(addr & 0xffff))
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printk(BIOS_DEBUG, "%lx\r", addr);
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value = ram_read_phys(addr);
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if (value != addr) {
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/* Display address with error. */
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printk(BIOS_ERR, "Fail @%lx Read value=%lx\n",
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addr, value);
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/* Abort after 256 verify errors. */
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if (++i > 256) {
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printk(BIOS_ERR, "Aborting.\n");
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break;
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}
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}
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}
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/* Display final address. */
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printk(BIOS_DEBUG, "%lx\r", addr);
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/* Print whether or not the verify failed. */
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printk(BIOS_DEBUG, "\nDRAM range %sverified.", i ? "_NOT_ " : "");
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}
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/**
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* Check whether the specified RAM area verifies correctly, and thus whether
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* we can be reasonably confident that our DRAM setup is correct.
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*
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* This is much more of a "Is my DRAM properly configured?" test than
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* a "Is my DRAM faulty?" test, though.
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*
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* @param start The beginning of the RAM area.
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* @param stop The end of the RAM area.
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*/
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void ram_check(unsigned long start, unsigned long stop)
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{
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printk(BIOS_DEBUG, "Testing DRAM: %lx-%lx\n", start, stop);
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ram_fill(start, stop);
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ram_verify(start, stop);
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printk(BIOS_DEBUG, "Done.\n");
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}
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