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Diffstat (limited to 'arch/mips/powertv/memory.c')
| -rw-r--r-- | arch/mips/powertv/memory.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/mips/powertv/memory.c b/arch/mips/powertv/memory.c new file mode 100644 index 0000000..28d0660 --- /dev/null +++ b/arch/mips/powertv/memory.c @@ -0,0 +1,186 @@ +/* + * 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/mips-boards/prom.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(256) /* If no memsize provided */ +#define LOW_MEM_MAX MEBIBYTE(252) /* Max usable low mem */ +#define RES_BOOTLDR_MEMSIZE MEBIBYTE(1) /* Memory reserved for bldr */ +#define BOOT_MEM_SIZE KIBIBYTE(256) /* Memory reserved for bldr */ +#define PHYS_MEM_START 0x10000000 /* Start of physical memory */ + +unsigned long ptv_memsize; + +char __initdata cmdline[COMMAND_LINE_SIZE]; + +void __init prom_meminit(void) +{ + char *memsize_str; + unsigned long memsize = 0; + unsigned int physend; + char *ptr; + int low_mem; + int high_mem; + + /* 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%lx\n", memsize); + /* add in memory that the bootloader doesn't + * report */ + memsize += BOOT_MEM_SIZE; + } else { + memsize = DEFAULT_MEMSIZE; + pr_info("Memsize not passed by bootloader, " + "defaulting to 0x%lx\n", memsize); + } + } + } + + /* Store memsize for diagnostic purposes */ + ptv_memsize = memsize; + + physend = PFN_ALIGN(&_end) - 0x80000000; + if (memsize > LOW_MEM_MAX) { + low_mem = LOW_MEM_MAX; + high_mem = memsize - low_mem; + } else { + low_mem = memsize; + high_mem = 0; + } + +/* + * TODO: We will use the hard code for memory configuration until + * the bootloader releases their device tree to us. + */ + /* + * Add the memory reserved for use by the bootloader to the + * memory map. + */ + add_memory_region(PHYS_MEM_START, RES_BOOTLDR_MEMSIZE, + BOOT_MEM_RESERVED); +#ifdef CONFIG_HIGHMEM_256_128 + /* + * Add memory in low for general use by the kernel and its friends + * (like drivers, applications, etc). + */ + add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE, + LOW_MEM_MAX - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM); + /* + * Add the memory reserved for reset vector. + */ + add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED); + /* + * Add the memory reserved. + */ + add_memory_region(0x20000000, MEBIBYTE(1024 + 75), BOOT_MEM_RESERVED); + /* + * Add memory in high for general use by the kernel and its friends + * (like drivers, applications, etc). + * + * 75MB is reserved for devices which are using the memory in high. + */ + add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75), + BOOT_MEM_RAM); +#elif defined CONFIG_HIGHMEM_128_128 + /* + * Add memory in low for general use by the kernel and its friends + * (like drivers, applications, etc). + */ + add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE, + MEBIBYTE(128) - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM); + /* + * Add the memory reserved. + */ + add_memory_region(PHYS_MEM_START + MEBIBYTE(128), + MEBIBYTE(128 + 1024 + 75), BOOT_MEM_RESERVED); + /* + * Add memory in high for general use by the kernel and its friends + * (like drivers, applications, etc). + * + * 75MB is reserved for devices which are using the memory in high. + */ + add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75), + BOOT_MEM_RAM); +#else + /* Add low memory regions for either: + * - no-highmemory configuration case -OR- + * - highmemory "HIGHMEM_LOWBANK_ONLY" case + */ + /* + * Add memory for general use by the kernel and its friends + * (like drivers, applications, etc). + */ + add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE, + low_mem - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM); + /* + * Add the memory reserved for reset vector. + */ + add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED); +#endif +} + +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); + } +} |