Merge branch 'wip-2.6.34' into old-private-masterarchived-private-master

1 files changed, 181 insertions, 0 deletions

diff --git a/arch/mips/powertv/memory.c b/arch/mips/powertv/memory.c
new file mode 100644
index 000000000000..f49eb3d0358b
--- /dev/null
+++ b/arch/mips/powertv/memory.c
@@ -0,0 +1,181 @@
+/*
+ * 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 */
+
+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);
+                        }
+                }
+        }
+
+        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);
+        }
+}