diff options
Diffstat (limited to 'target/linux/rb1xx-2.6/files/arch/mips/adm5120/memory.c')
| -rw-r--r-- | target/linux/rb1xx-2.6/files/arch/mips/adm5120/memory.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/target/linux/rb1xx-2.6/files/arch/mips/adm5120/memory.c b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/memory.c new file mode 100644 index 0000000000..e5c7f0c914 --- /dev/null +++ b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/memory.c @@ -0,0 +1,135 @@ +/***************************************************************************** + * 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) +{ + /* We do not have to prom memory to free */ + return 0; +} |