Merge branch 'master' of /home/davem/src/GIT/linux-2.6/

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 00000000000..f49eb3d0358
--- /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);
+	}
+}