354 строки
9.5 KiB
C
354 строки
9.5 KiB
C
/*
|
|
* Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
|
|
* Portions copyright (C) 2009 Cisco Systems, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* Apparently originally from arch/mips/malta-memory.c. Modified to work
|
|
* with the PowerTV bootloader.
|
|
*/
|
|
#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/mach-powertv/asic.h>
|
|
#include <asm/mach-powertv/ioremap.h>
|
|
|
|
#include "init.h"
|
|
|
|
/* Memory constants */
|
|
#define KIBIBYTE(n) ((n) * 1024) /* Number of kibibytes */
|
|
#define MEBIBYTE(n) ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
|
|
#define DEFAULT_MEMSIZE MEBIBYTE(128) /* If no memsize provided */
|
|
|
|
#define BLDR_SIZE KIBIBYTE(256) /* Memory reserved for bldr */
|
|
#define RV_SIZE MEBIBYTE(4) /* Size of reset vector */
|
|
|
|
#define LOW_MEM_END 0x20000000 /* Highest low memory address */
|
|
#define BLDR_ALIAS 0x10000000 /* Bootloader address */
|
|
#define RV_PHYS 0x1fc00000 /* Reset vector address */
|
|
#define LOW_RAM_END RV_PHYS /* End of real RAM in low mem */
|
|
|
|
/*
|
|
* Very low-level conversion from processor physical address to device
|
|
* DMA address for the first bank of memory.
|
|
*/
|
|
#define PHYS_TO_DMA(paddr) ((paddr) + (CONFIG_LOW_RAM_DMA - LOW_RAM_ALIAS))
|
|
|
|
unsigned long ptv_memsize;
|
|
|
|
/*
|
|
* struct low_mem_reserved - Items in low memory that are reserved
|
|
* @start: Physical address of item
|
|
* @size: Size, in bytes, of this item
|
|
* @is_aliased: True if this is RAM aliased from another location. If false,
|
|
* it is something other than aliased RAM and the RAM in the
|
|
* unaliased address is still visible outside of low memory.
|
|
*/
|
|
struct low_mem_reserved {
|
|
phys_addr_t start;
|
|
phys_addr_t size;
|
|
bool is_aliased;
|
|
};
|
|
|
|
/*
|
|
* Must be in ascending address order
|
|
*/
|
|
struct low_mem_reserved low_mem_reserved[] = {
|
|
{BLDR_ALIAS, BLDR_SIZE, true}, /* Bootloader RAM */
|
|
{RV_PHYS, RV_SIZE, false}, /* Reset vector */
|
|
};
|
|
|
|
/*
|
|
* struct mem_layout - layout of a piece of the system RAM
|
|
* @phys: Physical address of the start of this piece of RAM. This is the
|
|
* address at which both the processor and I/O devices see the
|
|
* RAM.
|
|
* @alias: Alias of this piece of memory in order to make it appear in
|
|
* the low memory part of the processor's address space. I/O
|
|
* devices don't see anything here.
|
|
* @size: Size, in bytes, of this piece of RAM
|
|
*/
|
|
struct mem_layout {
|
|
phys_addr_t phys;
|
|
phys_addr_t alias;
|
|
phys_addr_t size;
|
|
};
|
|
|
|
/*
|
|
* struct mem_layout_list - list descriptor for layouts of system RAM pieces
|
|
* @family: Specifies the family being described
|
|
* @n: Number of &struct mem_layout elements
|
|
* @layout: Pointer to the list of &mem_layout structures
|
|
*/
|
|
struct mem_layout_list {
|
|
enum family_type family;
|
|
size_t n;
|
|
struct mem_layout *layout;
|
|
};
|
|
|
|
static struct mem_layout f1500_layout[] = {
|
|
{0x20000000, 0x10000000, MEBIBYTE(256)},
|
|
};
|
|
|
|
static struct mem_layout f4500_layout[] = {
|
|
{0x40000000, 0x10000000, MEBIBYTE(256)},
|
|
{0x20000000, 0x20000000, MEBIBYTE(32)},
|
|
};
|
|
|
|
static struct mem_layout f8500_layout[] = {
|
|
{0x40000000, 0x10000000, MEBIBYTE(256)},
|
|
{0x20000000, 0x20000000, MEBIBYTE(32)},
|
|
{0x30000000, 0x30000000, MEBIBYTE(32)},
|
|
};
|
|
|
|
static struct mem_layout fx600_layout[] = {
|
|
{0x20000000, 0x10000000, MEBIBYTE(256)},
|
|
{0x60000000, 0x60000000, MEBIBYTE(128)},
|
|
};
|
|
|
|
static struct mem_layout_list layout_list[] = {
|
|
{FAMILY_1500, ARRAY_SIZE(f1500_layout), f1500_layout},
|
|
{FAMILY_1500VZE, ARRAY_SIZE(f1500_layout), f1500_layout},
|
|
{FAMILY_1500VZF, ARRAY_SIZE(f1500_layout), f1500_layout},
|
|
{FAMILY_4500, ARRAY_SIZE(f4500_layout), f4500_layout},
|
|
{FAMILY_8500, ARRAY_SIZE(f8500_layout), f8500_layout},
|
|
{FAMILY_8500RNG, ARRAY_SIZE(f8500_layout), f8500_layout},
|
|
{FAMILY_4600, ARRAY_SIZE(fx600_layout), fx600_layout},
|
|
{FAMILY_4600VZA, ARRAY_SIZE(fx600_layout), fx600_layout},
|
|
{FAMILY_8600, ARRAY_SIZE(fx600_layout), fx600_layout},
|
|
{FAMILY_8600VZB, ARRAY_SIZE(fx600_layout), fx600_layout},
|
|
};
|
|
|
|
/* If we can't determine the layout, use this */
|
|
static struct mem_layout default_layout[] = {
|
|
{0x20000000, 0x10000000, MEBIBYTE(128)},
|
|
};
|
|
|
|
/**
|
|
* register_non_ram - register low memory not available for RAM usage
|
|
*/
|
|
static __init void register_non_ram(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(low_mem_reserved); i++)
|
|
add_memory_region(low_mem_reserved[i].start,
|
|
low_mem_reserved[i].size, BOOT_MEM_RESERVED);
|
|
}
|
|
|
|
/**
|
|
* get_memsize - get the size of memory as a single bank
|
|
*/
|
|
static phys_addr_t get_memsize(void)
|
|
{
|
|
static char cmdline[COMMAND_LINE_SIZE] __initdata;
|
|
phys_addr_t memsize = 0;
|
|
char *memsize_str;
|
|
char *ptr;
|
|
|
|
/* Check the command line first for a memsize directive */
|
|
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 {
|
|
/* otherwise look in the environment */
|
|
memsize_str = prom_getenv("memsize");
|
|
|
|
if (memsize_str != NULL) {
|
|
pr_info("prom memsize = %s\n", memsize_str);
|
|
memsize = simple_strtol(memsize_str, NULL, 0);
|
|
}
|
|
|
|
if (memsize == 0) {
|
|
if (_prom_memsize != 0) {
|
|
memsize = _prom_memsize;
|
|
pr_info("_prom_memsize = 0x%x\n", memsize);
|
|
/* add in memory that the bootloader doesn't
|
|
* report */
|
|
memsize += BLDR_SIZE;
|
|
} else {
|
|
memsize = DEFAULT_MEMSIZE;
|
|
pr_info("Memsize not passed by bootloader, "
|
|
"defaulting to 0x%x\n", memsize);
|
|
}
|
|
}
|
|
}
|
|
|
|
return memsize;
|
|
}
|
|
|
|
/**
|
|
* register_low_ram - register an aliased section of RAM
|
|
* @p: Alias address of memory
|
|
* @n: Number of bytes in this section of memory
|
|
*
|
|
* Returns the number of bytes registered
|
|
*
|
|
*/
|
|
static __init phys_addr_t register_low_ram(phys_addr_t p, phys_addr_t n)
|
|
{
|
|
phys_addr_t s;
|
|
int i;
|
|
phys_addr_t orig_n;
|
|
|
|
orig_n = n;
|
|
|
|
BUG_ON(p + n > RV_PHYS);
|
|
|
|
for (i = 0; n != 0 && i < ARRAY_SIZE(low_mem_reserved); i++) {
|
|
phys_addr_t start;
|
|
phys_addr_t size;
|
|
|
|
start = low_mem_reserved[i].start;
|
|
size = low_mem_reserved[i].size;
|
|
|
|
/* Handle memory before this low memory section */
|
|
if (p < start) {
|
|
phys_addr_t s;
|
|
s = min(n, start - p);
|
|
add_memory_region(p, s, BOOT_MEM_RAM);
|
|
p += s;
|
|
n -= s;
|
|
}
|
|
|
|
/* Handle the low memory section itself. If it's aliased,
|
|
* we reduce the number of byes left, but if not, the RAM
|
|
* is available elsewhere and we don't reduce the number of
|
|
* bytes remaining. */
|
|
if (p == start) {
|
|
if (low_mem_reserved[i].is_aliased) {
|
|
s = min(n, size);
|
|
n -= s;
|
|
p += s;
|
|
} else
|
|
p += n;
|
|
}
|
|
}
|
|
|
|
return orig_n - n;
|
|
}
|
|
|
|
/*
|
|
* register_ram - register real RAM
|
|
* @p: Address of memory as seen by devices
|
|
* @alias: If the memory is seen at an additional address by the processor,
|
|
* this will be the address, otherwise it is the same as @p.
|
|
* @n: Number of bytes in this section of memory
|
|
*/
|
|
static __init void register_ram(phys_addr_t p, phys_addr_t alias,
|
|
phys_addr_t n)
|
|
{
|
|
/*
|
|
* If some or all of this memory has an alias, break it into the
|
|
* aliased and non-aliased portion.
|
|
*/
|
|
if (p != alias) {
|
|
phys_addr_t alias_size;
|
|
phys_addr_t registered;
|
|
|
|
alias_size = min(n, LOW_RAM_END - alias);
|
|
registered = register_low_ram(alias, alias_size);
|
|
ioremap_add_map(alias, p, n);
|
|
n -= registered;
|
|
p += registered;
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (n != 0) {
|
|
add_memory_region(p, n, BOOT_MEM_RAM);
|
|
ioremap_add_map(p, p, n);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* register_address_space - register things in the address space
|
|
* @memsize: Number of bytes of RAM installed
|
|
*
|
|
* Takes the given number of bytes of RAM and registers as many of the regions,
|
|
* or partial regions, as it can. So, the default configuration might have
|
|
* two regions with 256 MiB each. If the memsize passed in on the command line
|
|
* is 384 MiB, it will register the first region with 256 MiB and the second
|
|
* with 128 MiB.
|
|
*/
|
|
static __init void register_address_space(phys_addr_t memsize)
|
|
{
|
|
int i;
|
|
phys_addr_t size;
|
|
size_t n;
|
|
struct mem_layout *layout;
|
|
enum family_type family;
|
|
|
|
/*
|
|
* Register all of the things that aren't available to the kernel as
|
|
* memory.
|
|
*/
|
|
register_non_ram();
|
|
|
|
/* Find the appropriate memory description */
|
|
family = platform_get_family();
|
|
|
|
for (i = 0; i < ARRAY_SIZE(layout_list); i++) {
|
|
if (layout_list[i].family == family)
|
|
break;
|
|
}
|
|
|
|
if (i == ARRAY_SIZE(layout_list)) {
|
|
n = ARRAY_SIZE(default_layout);
|
|
layout = default_layout;
|
|
} else {
|
|
n = layout_list[i].n;
|
|
layout = layout_list[i].layout;
|
|
}
|
|
|
|
for (i = 0; memsize != 0 && i < n; i++) {
|
|
size = min(memsize, layout[i].size);
|
|
register_ram(layout[i].phys, layout[i].alias, size);
|
|
memsize -= size;
|
|
}
|
|
}
|
|
|
|
void __init prom_meminit(void)
|
|
{
|
|
ptv_memsize = get_memsize();
|
|
register_address_space(ptv_memsize);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|