diff options
Diffstat (limited to 'kernel/arch/mips/mti-malta/malta-memory.c')
| -rw-r--r-- | kernel/arch/mips/mti-malta/malta-memory.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/kernel/arch/mips/mti-malta/malta-memory.c b/kernel/arch/mips/mti-malta/malta-memory.c new file mode 100644 index 000000000..b769657be --- /dev/null +++ b/kernel/arch/mips/mti-malta/malta-memory.c @@ -0,0 +1,211 @@ +/* + * 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/cdmm.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); +} + +phys_addr_t mips_cdmm_phys_base(void) +{ + /* This address is "typically unused" */ + return 0x1fc10000; +} |