openwrtv3/target/linux/adm5120-2.6/files/arch/mips/adm5120/memory.c
Florian Fainelli d9dfd7341b Preliminary ADM5120 support, marked as broken
SVN-Revision: 6614
2007-03-19 17:34:37 +00:00

154 lines
4.3 KiB
C

/*****************************************************************************
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2003 ADMtek Incorporated.
* daniell@admtek.com.tw
* Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
*
* ########################################################################
*
* 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.
*
* ########################################################################
*
*****************************************************************************/
#include <linux/autoconf.h>
#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/mips-boards/prom.h>
extern char *prom_getenv(char *envname);
#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
#define ADM5120_MEMCTRL 0x1200001c
#define ADM5120_MEMCTRL_SDRAM_MASK 0x7
static const unsigned long adm_sdramsize[] __initdata = {
0x0, /* Reserved */
0x0400000, /* 4Mb */
0x0800000, /* 8Mb */
0x1000000, /* 16Mb */
0x4000000, /* 64Mb */
0x8000000, /* 128Mb */
};
/* determined physical memory size, not overridden by command line args */
unsigned long physical_memsize = 0L;
struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
struct prom_pmemblock * __init prom_getmdesc(void)
{
char *memsize_str;
unsigned int memsize;
char cmdline[CL_SIZE], *ptr;
memsize_str = prom_getenv("memsize");
if (!memsize_str)
{
prom_printf("memsize not set in boot prom, set to default (8Mb)\n");
physical_memsize = 0x00800000;
}
else
#ifdef DEBUG
prom_printf("prom_memsize = %s\n", memsize_str);
#endif
physical_memsize = simple_strtol(memsize_str, NULL, 0);
/* 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 = BOOT_MEM_RAM;
mdesc[0].base = CPHYSADDR(PFN_ALIGN(&_end));
mdesc[0].size = memsize - mdesc[0].base;
return &mdesc[0];
}
void __init prom_meminit(void)
{
struct prom_pmemblock *p;
p = prom_getmdesc();
while (p->size)
{
long type;
unsigned long base, size;
base = p->base;
type = p->type,
size = p->size;
add_memory_region(base, size, type);
p++;
}
}
#if 0
void __init prom_meminit(void)
{
unsigned long base = CPHYSADDR(PFN_ALIGN(&_end));
unsigned long size;
u32 memctrl = *(u32*)KSEG1ADDR(ADM5120_MEMCTRL);
size = adm_sdramsize[memctrl & ADM5120_MEMCTRL_SDRAM_MASK];
add_memory_region(base, size-base, BOOT_MEM_RAM);
}
#endif
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;
}