/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* 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.
*
* PROM library functions for acquiring/using memory descriptors given to
* us from the YAMON.
*/
#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>
/*#define DEBUG*/
enum yamon_memtypes {
yamon_dontuse,
yamon_prom,
yamon_free,
};
struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
#ifdef DEBUG
static char *mtypes[3] = {
"Dont use memory",
"YAMON PROM memory",
"Free memmory",
};
#endif
/* determined physical memory size, not overridden by command line args */
unsigned long physical_memsize = 0L;
struct prom_pmemblock * __init prom_getmdesc(void)
{
char *memsize_str;
unsigned int memsize;
char cmdline[CL_SIZE], *ptr;
/* otherwise look in the environment */
memsize_str = prom_getenv("memsize");
if (!memsize_str) {
prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
physical_memsize = 0x02000000;
} else {
#ifdef DEBUG
prom_printf("prom_memsize = %s\n", memsize_str);
#endif
physical_memsize = simple_strtol(memsize_str, NULL, 0);
}
#ifdef CONFIG_CPU_BIG_ENDIAN
/* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
word of physical memory */
physical_memsize -= PAGE_SIZE;
#endif
/* Check the command line for a memsize directive that overrides
the physical/default amount */
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
memsize = physical_memsize;
memset(mdesc, 0, sizeof(mdesc));
mdesc[0].type = yamon_dontuse;
mdesc[0].base = 0x00000000;
mdesc[0].size = 0x00001000;
mdesc[1].type = yamon_prom;
mdesc[1].base = 0x00001000;
mdesc[1].size = 0x000ef000;
#ifdef CONFIG_MIPS_MALTA
/*
* The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
* south bridge and PCI access always forwarded to the ISA Bus and
* BIOSCS# is always generated.
* This mean that this area can't be used as DMA memory for PCI
* devices.
*/
mdesc[2].type = yamon_dontuse;
mdesc[2].base = 0x000f0000;
mdesc[2].size = 0x00010000;
#else
mdesc[2].type = yamon_prom;
mdesc[2].base = 0x000f0000;
mdesc[2].size = 0x00010000;
#endif
mdesc[3].type = yamon_dontuse;
mdesc[3].base = 0x00100000;
mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - mdesc[3].base;
mdesc[4].type = yamon_free;
mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
mdesc[4].size = memsize - mdesc[4].base;
return &mdesc[0];
}
static int __init prom_memtype_classify (unsigned int type)
{
switch (type) {
case yamon_free:
return BOOT_MEM_RAM;
case yamon_prom:
return BOOT_MEM_ROM_DATA;
default:
return BOOT_MEM_RESERVED;
}
}
void __init prom_meminit(void)
{
struct prom_pmemblock *p;
#ifdef DEBUG
prom_printf("YAMON MEMORY DESCRIPTOR dump:\n");
p = prom_getmdesc();
while (p->size) {
int i = 0;
prom_printf("[%d,%p]: base<%08lx> size<%08lx> type<%s>\n",
i, p, p->base, p->size, mtypes[p->type]);
p++;
i++;
}
#endif
p = prom_getmdesc();
while (p->size) {
long type;
unsigned long base, size;
type = prom_memtype_classify (p->type);
base = p->base;
size = p->size;
add_memory_region(base, size, type);
p++;
}
}
unsigned long __init prom_free_prom_memory(void)
{
unsigned long freed = 0;
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 = PAGE_ALIGN(boot_mem_map.map[i].addr);
while (addr < boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size) {
ClearPageReserved(virt_to_page(__va(addr)));
init_page_count(virt_to_page(__va(addr)));
free_page((unsigned long)__va(addr));
addr += PAGE_SIZE;
freed += PAGE_SIZE;
}
}
printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
return freed;
}
