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Diffstat (limited to 'arch/mips/powertv/memory.c')
| -rw-r--r-- | arch/mips/powertv/memory.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/arch/mips/powertv/memory.c b/arch/mips/powertv/memory.c new file mode 100644 index 00000000..fb3d2966 --- /dev/null +++ b/arch/mips/powertv/memory.c @@ -0,0 +1,354 @@ +/* + * 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 <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); + } +} |