| /* |
| * 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. |
| * |
| * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. |
| * Copyright (C) 2013 Imagination Technologies Ltd. |
| */ |
| #include <linux/init.h> |
| #include <linux/libfdt.h> |
| #include <linux/of_fdt.h> |
| |
| #include <asm/prom.h> |
| #include <asm/fw/fw.h> |
| |
| #include <asm/mips-boards/generic.h> |
| |
| const char *get_system_type(void) |
| { |
| return "MIPS SEAD3"; |
| } |
| |
| static uint32_t get_memsize_from_cmdline(void) |
| { |
| int memsize = 0; |
| char *p = arcs_cmdline; |
| char *s = "memsize="; |
| |
| p = strstr(p, s); |
| if (p) { |
| p += strlen(s); |
| memsize = memparse(p, NULL); |
| } |
| |
| return memsize; |
| } |
| |
| static uint32_t get_memsize_from_env(void) |
| { |
| int memsize = 0; |
| char *p; |
| |
| p = fw_getenv("memsize"); |
| if (p) |
| memsize = memparse(p, NULL); |
| |
| return memsize; |
| } |
| |
| static uint32_t get_memsize(void) |
| { |
| uint32_t memsize; |
| |
| memsize = get_memsize_from_cmdline(); |
| if (memsize) |
| return memsize; |
| |
| return get_memsize_from_env(); |
| } |
| |
| static void __init parse_memsize_param(void) |
| { |
| int offset; |
| const uint64_t *prop_value; |
| int prop_len; |
| uint32_t memsize = get_memsize(); |
| |
| if (!memsize) |
| return; |
| |
| offset = fdt_path_offset(__dtb_start, "/memory"); |
| if (offset > 0) { |
| uint64_t new_value; |
| /* |
| * reg contains 2 32-bits BE values, offset and size. We just |
| * want to replace the size value without affecting the offset |
| */ |
| prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len); |
| new_value = be64_to_cpu(*prop_value); |
| new_value = (new_value & ~0xffffffffllu) | memsize; |
| fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value); |
| } |
| } |
| |
| void __init *plat_get_fdt(void) |
| { |
| return (void *)__dtb_start; |
| } |
| |
| void __init plat_mem_setup(void) |
| { |
| /* allow command line/bootloader env to override memory size in DT */ |
| parse_memsize_param(); |
| |
| /* |
| * Load the builtin devicetree. This causes the chosen node to be |
| * parsed resulting in our memory appearing |
| */ |
| __dt_setup_arch(__dtb_start); |
| } |
| |
| void __init device_tree_init(void) |
| { |
| if (!initial_boot_params) |
| return; |
| |
| unflatten_and_copy_device_tree(); |
| } |