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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* PROM library functions for acquiring/using memory descriptors given to
* us from the YAMON.
*
* Copyright (C) 1999,2000,2012 MIPS Technologies, Inc.
* All rights reserved.
* Authors: Carsten Langgaard <carstenl@mips.com>
* Steven J. Hill <sjhill@mips.com>
*/
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/string.h>
#include <asm/bootinfo.h>
#include <asm/cdmm.h>
#include <asm/maar.h>
#include <asm/sections.h>
#include <asm/fw/fw.h>
/* determined physical memory size, not overridden by command line args */
unsigned long physical_memsize = 0L;
static void free_init_pages_eva_malta(void *begin, void *end)
{
free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
__pa_symbol((unsigned long *)end));
}
void __init fw_meminit(void)
{
char *memsize_str, *ememsize_str = NULL, *ptr;
unsigned long memsize = 0, ememsize = 0;
unsigned long kernel_start_phys, kernel_end_phys;
static char cmdline[COMMAND_LINE_SIZE] __initdata;
bool eva = config_enabled(CONFIG_EVA);
int tmp;
free_init_pages_eva = eva ? free_init_pages_eva_malta : NULL;
memsize_str = fw_getenv("memsize");
if (memsize_str) {
tmp = kstrtoul(memsize_str, 0, &memsize);
if (tmp)
pr_warn("Failed to read the 'memsize' env variable.\n");
}
if (eva) {
/* Look for ememsize for EVA */
ememsize_str = fw_getenv("ememsize");
if (ememsize_str) {
tmp = kstrtoul(ememsize_str, 0, &ememsize);
if (tmp)
pr_warn("Failed to read the 'ememsize' env variable.\n");
}
}
if (!memsize && !ememsize) {
pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
physical_memsize = 0x02000000;
} else {
if (memsize > (256 << 20)) { /* memsize should be capped to 256M */
pr_warn("Unsupported memsize value (0x%lx) detected! "
"Using 0x10000000 (256M) instead\n",
memsize);
memsize = 256 << 20;
}
/* If ememsize is set, then set physical_memsize to that */
physical_memsize = ememsize ? : memsize;
}
#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=");
/* And now look for ememsize */
if (eva) {
ptr = strstr(cmdline, "ememsize=");
if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
ptr = strstr(ptr, " ememsize=");
}
if (ptr)
memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
else
memsize = physical_memsize;
/* Last 64K for HIGHMEM arithmetics */
if (memsize > 0x7fff0000)
memsize = 0x7fff0000;
add_memory_region(PHYS_OFFSET, 0x00001000, BOOT_MEM_RESERVED);
/*
* YAMON may still be using the region of memory from 0x1000 to 0xfffff
* if it has started secondary CPUs.
*/
add_memory_region(PHYS_OFFSET + 0x00001000, 0x000ef000,
BOOT_MEM_ROM_DATA);
/*
* 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.
*/
add_memory_region(PHYS_OFFSET + 0x000f0000, 0x00010000,
BOOT_MEM_RESERVED);
/*
* Reserve the memory used by kernel code, and allow the rest of RAM to
* be used.
*/
kernel_start_phys = PHYS_OFFSET + 0x00100000;
kernel_end_phys = PHYS_OFFSET + CPHYSADDR(PFN_ALIGN(&_end));
add_memory_region(kernel_start_phys, kernel_end_phys,
BOOT_MEM_RESERVED);
add_memory_region(kernel_end_phys, memsize - kernel_end_phys,
BOOT_MEM_RAM);
}
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("YAMON memory",
addr, addr + boot_mem_map.map[i].size);
}
}
phys_addr_t mips_cdmm_phys_base(void)
{
/* This address is "typically unused" */
return 0x1fc10000;
}
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