![Yoichi Yuasa](/assets/img/avatar_default.png)
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/799/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
182 lines
5.3 KiB
C
182 lines
5.3 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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* Portions copyright (C) 2009 Cisco Systems, Inc.
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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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* Apparently originally from arch/mips/malta-memory.c. Modified to work
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* with the PowerTV bootloader.
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*/
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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-boards/prom.h>
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#include "init.h"
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/* Memory constants */
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#define KIBIBYTE(n) ((n) * 1024) /* Number of kibibytes */
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#define MEBIBYTE(n) ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
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#define DEFAULT_MEMSIZE MEBIBYTE(256) /* If no memsize provided */
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#define LOW_MEM_MAX MEBIBYTE(252) /* Max usable low mem */
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#define RES_BOOTLDR_MEMSIZE MEBIBYTE(1) /* Memory reserved for bldr */
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#define BOOT_MEM_SIZE KIBIBYTE(256) /* Memory reserved for bldr */
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#define PHYS_MEM_START 0x10000000 /* Start of physical memory */
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char __initdata cmdline[COMMAND_LINE_SIZE];
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void __init prom_meminit(void)
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{
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char *memsize_str;
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unsigned long memsize = 0;
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unsigned int physend;
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char *ptr;
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int low_mem;
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int high_mem;
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/* Check the command line first for a memsize directive */
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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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/* otherwise look in the environment */
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memsize_str = prom_getenv("memsize");
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if (memsize_str != NULL) {
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pr_info("prom memsize = %s\n", memsize_str);
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memsize = simple_strtol(memsize_str, NULL, 0);
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}
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if (memsize == 0) {
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if (_prom_memsize != 0) {
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memsize = _prom_memsize;
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pr_info("_prom_memsize = 0x%lx\n", memsize);
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/* add in memory that the bootloader doesn't
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* report */
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memsize += BOOT_MEM_SIZE;
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} else {
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memsize = DEFAULT_MEMSIZE;
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pr_info("Memsize not passed by bootloader, "
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"defaulting to 0x%lx\n", memsize);
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}
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}
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}
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physend = PFN_ALIGN(&_end) - 0x80000000;
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if (memsize > LOW_MEM_MAX) {
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low_mem = LOW_MEM_MAX;
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high_mem = memsize - low_mem;
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} else {
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low_mem = memsize;
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high_mem = 0;
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}
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/*
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* TODO: We will use the hard code for memory configuration until
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* the bootloader releases their device tree to us.
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*/
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/*
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* Add the memory reserved for use by the bootloader to the
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* memory map.
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*/
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add_memory_region(PHYS_MEM_START, RES_BOOTLDR_MEMSIZE,
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BOOT_MEM_RESERVED);
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#ifdef CONFIG_HIGHMEM_256_128
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/*
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* Add memory in low for general use by the kernel and its friends
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* (like drivers, applications, etc).
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*/
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add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
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LOW_MEM_MAX - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
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/*
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* Add the memory reserved for reset vector.
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*/
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add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
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/*
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* Add the memory reserved.
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*/
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add_memory_region(0x20000000, MEBIBYTE(1024 + 75), BOOT_MEM_RESERVED);
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/*
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* Add memory in high for general use by the kernel and its friends
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* (like drivers, applications, etc).
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*
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* 75MB is reserved for devices which are using the memory in high.
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*/
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add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
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BOOT_MEM_RAM);
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#elif defined CONFIG_HIGHMEM_128_128
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/*
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* Add memory in low for general use by the kernel and its friends
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* (like drivers, applications, etc).
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*/
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add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
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MEBIBYTE(128) - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
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/*
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* Add the memory reserved.
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*/
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add_memory_region(PHYS_MEM_START + MEBIBYTE(128),
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MEBIBYTE(128 + 1024 + 75), BOOT_MEM_RESERVED);
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/*
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* Add memory in high for general use by the kernel and its friends
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* (like drivers, applications, etc).
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*
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* 75MB is reserved for devices which are using the memory in high.
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*/
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add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
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BOOT_MEM_RAM);
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#else
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/* Add low memory regions for either:
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* - no-highmemory configuration case -OR-
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* - highmemory "HIGHMEM_LOWBANK_ONLY" case
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*/
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/*
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* Add memory for general use by the kernel and its friends
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* (like drivers, applications, etc).
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*/
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add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
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low_mem - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
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/*
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* Add the memory reserved for reset vector.
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*/
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add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
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#endif
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}
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void __init prom_free_prom_memory(void)
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{
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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 = boot_mem_map.map[i].addr;
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free_init_pages("prom memory",
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addr, addr + boot_mem_map.map[i].size);
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}
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}
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