[MTD] Add mapping driver for Intel PXA27x Mainstone board flash.

From: Nicolas Pitre <nico@cam.org>
Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/maps/Kconfig

@@ -1,5 +1,5 @@
 # drivers/mtd/maps/Kconfig
-# $Id: Kconfig,v 1.51 2005/03/18 02:07:22 gleixner Exp $
+# $Id: Kconfig,v 1.54 2005/06/30 22:41:36 tpoynor Exp $
 
 menu "Mapping drivers for chip access"
 	depends on MTD!=n
@@ -129,6 +129,14 @@ config MTD_LUBBOCK
 	  This provides a driver for the on-board flash of the Intel
 	  'Lubbock' XScale evaluation board.
 
+config MTD_MAINSTONE
+	tristate "CFI Flash device mapped on Intel Mainstone XScale eval board"
+	depends on MACH_MAINSTONE && MTD_CFI_INTELEXT
+	select MTD_PARTITIONS
+	help
+	  This provides a driver for the on-board flash of the Intel
+	  'Mainstone PXA27x evaluation board.
+
 config MTD_OCTAGON
 	tristate "JEDEC Flash device mapped on Octagon 5066 SBC"
 	depends on X86 && MTD_JEDEC && MTD_COMPLEX_MAPPINGS

drivers/mtd/maps/Makefile

@@ -1,7 +1,7 @@
 #
 # linux/drivers/maps/Makefile
 #
-# $Id: Makefile.common,v 1.26 2005/03/02 14:51:04 dvrabel Exp $
+# $Id: Makefile.common,v 1.29 2005/06/30 22:41:36 tpoynor Exp $
 
 ifeq ($(CONFIG_MTD_COMPLEX_MAPPINGS),y)
 obj-$(CONFIG_MTD)		+= map_funcs.o
@@ -22,6 +22,7 @@ obj-$(CONFIG_MTD_AMD76XROM)	+= amd76xrom.o
 obj-$(CONFIG_MTD_ICHXROM)	+= ichxrom.o
 obj-$(CONFIG_MTD_TSUNAMI)	+= tsunami_flash.o
 obj-$(CONFIG_MTD_LUBBOCK)	+= lubbock-flash.o
+obj-$(CONFIG_MTD_MAINSTONE)	+= mainstone-flash.o
 obj-$(CONFIG_MTD_MBX860)	+= mbx860.o
 obj-$(CONFIG_MTD_CEIVA)		+= ceiva.o
 obj-$(CONFIG_MTD_OCTAGON)	+= octagon-5066.o

drivers/mtd/maps/mainstone-flash.c

@@ -0,0 +1,178 @@
+/*
+ * $Id:  $
+ *
+ * Map driver for the Mainstone developer platform.
+ *
+ * Author:	Nicolas Pitre
+ * Copyright:	(C) 2001 MontaVista Software Inc.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/mainstone.h>
+
+
+#define ROM_ADDR	0x00000000
+#define FLASH_ADDR	0x04000000
+
+#define WINDOW_SIZE 	0x04000000
+
+static void mainstone_map_inval_cache(struct map_info *map, unsigned long from,
+				      ssize_t len)
+{
+	consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
+}
+
+static struct map_info mainstone_maps[2] = { {
+	.size =		WINDOW_SIZE,
+	.phys =		PXA_CS0_PHYS,
+	.inval_cache = 	mainstone_map_inval_cache,
+}, {
+	.size =		WINDOW_SIZE,
+	.phys =		PXA_CS1_PHYS,
+	.inval_cache = 	mainstone_map_inval_cache,
+} };
+
+static struct mtd_partition mainstone_partitions[] = {
+	{
+		.name =		"Bootloader",
+		.size =		0x00040000,
+		.offset =	0,
+		.mask_flags =	MTD_WRITEABLE  /* force read-only */
+	},{
+		.name =		"Kernel",
+		.size =		0x00400000,
+		.offset =	0x00040000,
+	},{
+		.name =		"Filesystem",
+		.size =		MTDPART_SIZ_FULL,
+		.offset =	0x00440000
+	}
+};
+
+static struct mtd_info *mymtds[2];
+static struct mtd_partition *parsed_parts[2];
+static int nr_parsed_parts[2];
+
+static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
+
+static int __init init_mainstone(void)
+{
+	int SW7 = 0;  /* FIXME: get from SCR (Mst doc section 3.2.1.1) */
+	int ret = 0, i;
+
+	mainstone_maps[0].bankwidth = (BOOT_DEF & 1) ? 2 : 4;
+	mainstone_maps[1].bankwidth = 4;
+
+	/* Compensate for SW7 which swaps the flash banks */
+	mainstone_maps[SW7].name = "processor flash";
+	mainstone_maps[SW7 ^ 1].name = "main board flash";
+
+	printk(KERN_NOTICE "Mainstone configured to boot from %s\n",
+	       mainstone_maps[0].name);
+
+	for (i = 0; i < 2; i++) {
+		mainstone_maps[i].virt = ioremap(mainstone_maps[i].phys,
+						 WINDOW_SIZE);
+		if (!mainstone_maps[i].virt) {
+			printk(KERN_WARNING "Failed to ioremap %s\n", 
+			       mainstone_maps[i].name);
+			if (!ret)
+				ret = -ENOMEM;
+			continue;
+		}
+		mainstone_maps[i].cached = 
+			ioremap_cached(mainstone_maps[i].phys, WINDOW_SIZE);
+		if (!mainstone_maps[i].cached)
+			printk(KERN_WARNING "Failed to ioremap cached %s\n",
+			       mainstone_maps[i].name);
+		simple_map_init(&mainstone_maps[i]);
+
+		printk(KERN_NOTICE 
+		       "Probing %s at physical address 0x%08lx"
+		       " (%d-bit bankwidth)\n",
+		       mainstone_maps[i].name, mainstone_maps[i].phys, 
+		       mainstone_maps[i].bankwidth * 8);
+
+		mymtds[i] = do_map_probe("cfi_probe", &mainstone_maps[i]);
+		
+		if (!mymtds[i]) {
+			iounmap((void *)mainstone_maps[i].virt);
+			if (mainstone_maps[i].cached)
+				iounmap(mainstone_maps[i].cached);
+			if (!ret)
+				ret = -EIO;
+			continue;
+		}
+		mymtds[i]->owner = THIS_MODULE;
+
+		ret = parse_mtd_partitions(mymtds[i], probes,
+					   &parsed_parts[i], 0);
+
+		if (ret > 0)
+			nr_parsed_parts[i] = ret;
+	}
+
+	if (!mymtds[0] && !mymtds[1])
+		return ret;
+	
+	for (i = 0; i < 2; i++) {
+		if (!mymtds[i]) {
+			printk(KERN_WARNING "%s is absent. Skipping\n", 
+			       mainstone_maps[i].name);
+		} else if (nr_parsed_parts[i]) {
+			add_mtd_partitions(mymtds[i], parsed_parts[i], 
+					   nr_parsed_parts[i]);
+		} else if (!i) {
+			printk("Using static partitions on %s\n",
+			       mainstone_maps[i].name);
+			add_mtd_partitions(mymtds[i], mainstone_partitions, 
+					   ARRAY_SIZE(mainstone_partitions));
+		} else {
+			printk("Registering %s as whole device\n", 
+			       mainstone_maps[i].name);
+			add_mtd_device(mymtds[i]);
+		}
+	}
+	return 0;
+}
+
+static void __exit cleanup_mainstone(void)
+{
+	int i;
+	for (i = 0; i < 2; i++) {
+		if (!mymtds[i])
+			continue;
+
+		if (nr_parsed_parts[i] || !i)
+			del_mtd_partitions(mymtds[i]);
+		else
+			del_mtd_device(mymtds[i]);
+
+		map_destroy(mymtds[i]);
+		iounmap((void *)mainstone_maps[i].virt);
+		if (mainstone_maps[i].cached)
+			iounmap(mainstone_maps[i].cached);
+		kfree(parsed_parts[i]);
+	}
+}
+
+module_init(init_mainstone);
+module_exit(cleanup_mainstone);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
+MODULE_DESCRIPTION("MTD map driver for Intel Mainstone");