154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/*****************************************************************************
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2003 ADMtek Incorporated.
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* daniell@admtek.com.tw
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* Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
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*
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* ########################################################################
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* ########################################################################
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*
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*****************************************************************************/
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#include <linux/autoconf.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/pfn.h>
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#include <linux/string.h>
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#include <asm/bootinfo.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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#include <asm-mips/mips-boards/prom.h>
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extern char *prom_getenv(char *envname);
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#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
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#define ADM5120_MEMCTRL 0x1200001c
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#define ADM5120_MEMCTRL_SDRAM_MASK 0x7
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static const unsigned long adm_sdramsize[] __initdata = {
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0x0, /* Reserved */
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0x0400000, /* 4Mb */
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0x0800000, /* 8Mb */
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0x1000000, /* 16Mb */
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0x4000000, /* 64Mb */
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0x8000000, /* 128Mb */
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};
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/* determined physical memory size, not overridden by command line args */
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unsigned long physical_memsize = 0L;
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struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
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struct prom_pmemblock * __init prom_getmdesc(void)
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{
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char *memsize_str;
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unsigned int memsize;
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char cmdline[CL_SIZE], *ptr;
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memsize_str = prom_getenv("memsize");
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if (!memsize_str)
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{
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prom_printf("memsize not set in boot prom, set to default (8Mb)\n");
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physical_memsize = 0x00800000;
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}
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else
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#ifdef DEBUG
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prom_printf("prom_memsize = %s\n", memsize_str);
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#endif
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physical_memsize = simple_strtol(memsize_str, NULL, 0);
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/* Check the command line for a memsize directive that overrides
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* the physical/default amount */
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strcpy(cmdline, arcs_cmdline);
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ptr = strstr(cmdline, "memsize=");
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if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
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ptr = strstr(ptr, " memsize=");
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if (ptr)
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memsize = memparse(ptr + 8, &ptr);
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else
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memsize = physical_memsize;
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memset(mdesc, 0, sizeof(mdesc));
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mdesc[0].type = BOOT_MEM_RAM;
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mdesc[0].base = CPHYSADDR(PFN_ALIGN(&_end));
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mdesc[0].size = memsize - mdesc[0].base;
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return &mdesc[0];
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}
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void __init prom_meminit(void)
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{
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struct prom_pmemblock *p;
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p = prom_getmdesc();
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while (p->size)
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{
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long type;
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unsigned long base, size;
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base = p->base;
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type = p->type,
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size = p->size;
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add_memory_region(base, size, type);
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p++;
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}
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}
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#if 0
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void __init prom_meminit(void)
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{
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unsigned long base = CPHYSADDR(PFN_ALIGN(&_end));
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unsigned long size;
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u32 memctrl = *(u32*)KSEG1ADDR(ADM5120_MEMCTRL);
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size = adm_sdramsize[memctrl & ADM5120_MEMCTRL_SDRAM_MASK];
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add_memory_region(base, size-base, BOOT_MEM_RAM);
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}
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#endif
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unsigned long __init prom_free_prom_memory(void)
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{
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unsigned long freed = 0;
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unsigned long addr;
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int i;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
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continue;
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addr = PAGE_ALIGN(boot_mem_map.map[i].addr);
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while (addr < boot_mem_map.map[i].addr
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+ boot_mem_map.map[i].size) {
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ClearPageReserved(virt_to_page(__va(addr)));
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init_page_count(virt_to_page(__va(addr)));
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free_page((unsigned long)__va(addr));
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addr += PAGE_SIZE;
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freed += PAGE_SIZE;
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}
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}
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printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
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return freed;
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}
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