diff options
Diffstat (limited to 'arch/mips/mti-malta/malta-memory.c')
| -rw-r--r-- | arch/mips/mti-malta/malta-memory.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/mips/mti-malta/malta-memory.c b/arch/mips/mti-malta/malta-memory.c new file mode 100644 index 00000000000..61888ff72c8 --- /dev/null +++ b/arch/mips/mti-malta/malta-memory.c @@ -0,0 +1,177 @@ +/* + * 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, +}; +static 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; + +static 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) { + printk(KERN_WARNING + "memsize not set in boot prom, set to default (32Mb)\n"); + physical_memsize = 0x02000000; + } else { +#ifdef DEBUG + pr_debug("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; + + /* + * 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; + + 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 + pr_debug("YAMON MEMORY DESCRIPTOR dump:\n"); + p = prom_getmdesc(); + while (p->size) { + int i = 0; + pr_debug("[%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++; + } +} + +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); + } +} |