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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/maar.h>
#include <asm/sections.h>
#include <asm/fw/fw.h>
static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
/* determined physical memory size, not overridden by command line args */
unsigned long physical_memsize = 0L;
fw_memblock_t * __init fw_getmdesc(int eva)
{
char *memsize_str, *ememsize_str = NULL, *ptr;
unsigned long memsize = 0, ememsize = 0;
static char cmdline[COMMAND_LINE_SIZE] __initdata;
int tmp;
/* otherwise look in the environment */
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;
memset(mdesc, 0, sizeof(mdesc));
mdesc[0].type = fw_dontuse;
mdesc[0].base = PHYS_OFFSET;
mdesc[0].size = 0x00001000;
mdesc[1].type = fw_code;
mdesc[1].base = mdesc[0].base + 0x00001000UL;
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 = fw_dontuse;
mdesc[2].base = mdesc[0].base + 0x000f0000UL;
mdesc[2].size = 0x00010000;
mdesc[3].type = fw_dontuse;
mdesc[3].base = mdesc[0].base + 0x00100000UL;
mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
0x00100000UL;
mdesc[4].type = fw_free;
mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end));
mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base);
return &mdesc[0];
}
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));
}
static int __init fw_memtype_classify(unsigned int type)
{
switch (type) {
case fw_free:
return BOOT_MEM_RAM;
case fw_code:
return BOOT_MEM_ROM_DATA;
default:
return BOOT_MEM_RESERVED;
}
}
void __init fw_meminit(void)
{
fw_memblock_t *p;
p = fw_getmdesc(config_enabled(CONFIG_EVA));
free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
free_init_pages_eva_malta : NULL);
while (p->size) {
long type;
unsigned long base, size;
type = fw_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("YAMON memory",
addr, addr + boot_mem_map.map[i].size);
}
}
unsigned platform_maar_init(unsigned num_pairs)
{
phys_addr_t mem_end = (physical_memsize & ~0xffffull) - 1;
struct maar_config cfg[] = {
/* DRAM preceding I/O */
{ 0x00000000, 0x0fffffff, MIPS_MAAR_S },
/* DRAM following I/O */
{ 0x20000000, mem_end, MIPS_MAAR_S },
/* DRAM alias in upper half of physical */
{ 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S },
};
unsigned i, num_cfg = ARRAY_SIZE(cfg);
/* If DRAM fits before I/O, drop the region following it */
if (physical_memsize <= 0x10000000) {
num_cfg--;
for (i = 1; i < num_cfg; i++)
cfg[i] = cfg[i + 1];
}
return maar_config(cfg, num_cfg, num_pairs);
}
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