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-rw-r--r--arch/mips/powertv/memory.c353
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diff --git a/arch/mips/powertv/memory.c b/arch/mips/powertv/memory.c
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--- a/arch/mips/powertv/memory.c
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-/*
- * 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);
- }
-}