/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
* Portions copyright (C) 2009 Cisco Systems, Inc.
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Apparently originally from arch/mips/malta-memory.c. Modified to work
* with the PowerTV bootloader.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/string.h>
#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/mips-boards/prom.h>
#include "init.h"
/* Memory constants */
#define KIBIBYTE(n) ((n) * 1024) /* Number of kibibytes */
#define MEBIBYTE(n) ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
#define DEFAULT_MEMSIZE MEBIBYTE(256) /* If no memsize provided */
#define LOW_MEM_MAX MEBIBYTE(252) /* Max usable low mem */
#define RES_BOOTLDR_MEMSIZE MEBIBYTE(1) /* Memory reserved for bldr */
#define BOOT_MEM_SIZE KIBIBYTE(256) /* Memory reserved for bldr */
#define PHYS_MEM_START 0x10000000 /* Start of physical memory */
char __initdata cmdline[COMMAND_LINE_SIZE];
void __init prom_meminit(void)
{
char *memsize_str;
unsigned long memsize = 0;
unsigned int physend;
char *ptr;
int low_mem;
int high_mem;
/* Check the command line first for a memsize directive */
strcpy(cmdline, arcs_cmdline);
ptr = strstr(cmdline, "memsize=");
if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
ptr = strstr(ptr, " memsize=");
if (ptr) {
memsize = memparse(ptr + 8, &ptr);
} else {
/* otherwise look in the environment */
memsize_str = prom_getenv("memsize");
if (memsize_str != NULL) {
pr_info("prom memsize = %s\n", memsize_str);
memsize = simple_strtol(memsize_str, NULL, 0);
}
if (memsize == 0) {
if (_prom_memsize != 0) {
memsize = _prom_memsize;
pr_info("_prom_memsize = 0x%lx\n", memsize);
/* add in memory that the bootloader doesn't
* report */
memsize += BOOT_MEM_SIZE;
} else {
memsize = DEFAULT_MEMSIZE;
pr_info("Memsize not passed by bootloader, "
"defaulting to 0x%lx\n", memsize);
}
}
}
physend = PFN_ALIGN(&_end) - 0x80000000;
if (memsize > LOW_MEM_MAX) {
low_mem = LOW_MEM_MAX;
high_mem = memsize - low_mem;
} else {
low_mem = memsize;
high_mem = 0;
}
/*
* TODO: We will use the hard code for memory configuration until
* the bootloader releases their device tree to us.
*/
/*
* Add the memory reserved for use by the bootloader to the
* memory map.
*/
add_memory_region(PHYS_MEM_START, RES_BOOTLDR_MEMSIZE,
BOOT_MEM_RESERVED);
#ifdef CONFIG_HIGHMEM_256_128
/*
* Add memory in low for general use by the kernel and its friends
* (like drivers, applications, etc).
*/
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
LOW_MEM_MAX - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
/*
* Add the memory reserved for reset vector.
*/
add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
/*
* Add the memory reserved.
*/
add_memory_region(0x20000000, MEBIBYTE(1024 + 75), BOOT_MEM_RESERVED);
/*
* Add memory in high for general use by the kernel and its friends
* (like drivers, applications, etc).
*
* 75MB is reserved for devices which are using the memory in high.
*/
add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
BOOT_MEM_RAM);
#elif defined CONFIG_HIGHMEM_128_128
/*
* Add memory in low for general use by the kernel and its friends
* (like drivers, applications, etc).
*/
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
MEBIBYTE(128) - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
/*
* Add the memory reserved.
*/
add_memory_region(PHYS_MEM_START + MEBIBYTE(128),
MEBIBYTE(128 + 1024 + 75), BOOT_MEM_RESERVED);
/*
* Add memory in high for general use by the kernel and its friends
* (like drivers, applications, etc).
*
* 75MB is reserved for devices which are using the memory in high.
*/
add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
BOOT_MEM_RAM);
#else
/* Add low memory regions for either:
* - no-highmemory configuration case -OR-
* - highmemory "HIGHMEM_LOWBANK_ONLY" case
*/
/*
* Add memory for general use by the kernel and its friends
* (like drivers, applications, etc).
*/
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
low_mem - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
/*
* Add the memory reserved for reset vector.
*/
add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
#endif
}
void __init prom_free_prom_memory(void)
{
unsigned long addr;
int i;
for (i = 0; i < boot_mem_map.nr_map; i++) {
if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
continue;
addr = boot_mem_map.map[i].addr;
free_init_pages("prom memory",
addr, addr + boot_mem_map.map[i].size);
}
}
