1 files changed, 177 insertions, 0 deletions

diff --git a/arch/mips/mti-malta/malta-memory.c b/arch/mips/mti-malta/malta-memory.c
new file mode 100644
index 000000000000..61888ff72c87
--- /dev/null
+++ b/arch/mips/mti-malta/malta-memory.c
@@ -0,0 +1,177 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  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.
+ *
+ * PROM library functions for acquiring/using memory descriptors given to
+ * us from the YAMON.
+ */
+#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>
+
+/*#define DEBUG*/
+
+enum yamon_memtypes {
+        yamon_dontuse,
+        yamon_prom,
+        yamon_free,
+};
+static struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
+
+#ifdef DEBUG
+static char *mtypes[3] = {
+        "Dont use memory",
+        "YAMON PROM memory",
+        "Free memmory",
+};
+#endif
+
+/* determined physical memory size, not overridden by command line args  */
+unsigned long physical_memsize = 0L;
+
+static struct prom_pmemblock * __init prom_getmdesc(void)
+{
+        char *memsize_str;
+        unsigned int memsize;
+        char cmdline[CL_SIZE], *ptr;
+
+        /* otherwise look in the environment */
+        memsize_str = prom_getenv("memsize");
+        if (!memsize_str) {
+                printk(KERN_WARNING
+                       "memsize not set in boot prom, set to default (32Mb)\n");
+                physical_memsize = 0x02000000;
+        } else {
+#ifdef DEBUG
+                pr_debug("prom_memsize = %s\n", memsize_str);
+#endif
+                physical_memsize = simple_strtol(memsize_str, NULL, 0);
+        }
+
+#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=");
+
+        if (ptr)
+                memsize = memparse(ptr + 8, &ptr);
+        else
+                memsize = physical_memsize;
+
+        memset(mdesc, 0, sizeof(mdesc));
+
+        mdesc[0].type = yamon_dontuse;
+        mdesc[0].base = 0x00000000;
+        mdesc[0].size = 0x00001000;
+
+        mdesc[1].type = yamon_prom;
+        mdesc[1].base = 0x00001000;
+        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 = yamon_dontuse;
+        mdesc[2].base = 0x000f0000;
+        mdesc[2].size = 0x00010000;
+
+        mdesc[3].type = yamon_dontuse;
+        mdesc[3].base = 0x00100000;
+        mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - mdesc[3].base;
+
+        mdesc[4].type = yamon_free;
+        mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
+        mdesc[4].size = memsize - mdesc[4].base;
+
+        return &mdesc[0];
+}
+
+static int __init prom_memtype_classify(unsigned int type)
+{
+        switch (type) {
+        case yamon_free:
+                return BOOT_MEM_RAM;
+        case yamon_prom:
+                return BOOT_MEM_ROM_DATA;
+        default:
+                return BOOT_MEM_RESERVED;
+        }
+}
+
+void __init prom_meminit(void)
+{
+        struct prom_pmemblock *p;
+
+#ifdef DEBUG
+        pr_debug("YAMON MEMORY DESCRIPTOR dump:\n");
+        p = prom_getmdesc();
+        while (p->size) {
+                int i = 0;
+                pr_debug("[%d,%p]: base<%08lx> size<%08lx> type<%s>\n",
+                         i, p, p->base, p->size, mtypes[p->type]);
+                p++;
+                i++;
+        }
+#endif
+        p = prom_getmdesc();
+
+        while (p->size) {
+                long type;
+                unsigned long base, size;
+
+                type = prom_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("prom memory",
+                                addr, addr + boot_mem_map.map[i].size);
+        }
+}