1 files changed, 287 insertions, 178 deletions

diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index bbb42c35b69..217c25d7381 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -1,9 +1,12 @@
 /*
- * Normal mappings of chips in physical memory for OF devices
+ * Flash mappings described by the OF (or flattened) device tree
  *
  * Copyright (C) 2006 MontaVista Software Inc.
  * Author: Vitaly Wool <vwool@ru.mvista.com>
  *
+ * Revised to handle newer style flash binding by:
+ *   Copyright (C) 2007 David Gibson, IBM Corporation.
+ *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
@@ -12,244 +15,350 @@
 
 #include <linux/module.h>
 #include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/partitions.h>
-#include <linux/mtd/physmap.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/of_device.h>
-#include <asm/of_platform.h>
-
-struct physmap_flash_info {
-	struct mtd_info		*mtd;
-	struct map_info		map;
-	struct resource		*res;
-#ifdef CONFIG_MTD_PARTITIONS
-	int			nr_parts;
-	struct mtd_partition	*parts;
-#endif
+#include <linux/mtd/concat.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+struct of_flash_list {
+	struct mtd_info *mtd;
+	struct map_info map;
+	struct resource *res;
 };
 
-static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
-#ifdef CONFIG_MTD_PARTITIONS
-static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
-#endif
+struct of_flash {
+	struct mtd_info		*cmtd;
+	int list_size; /* number of elements in of_flash_list */
+	struct of_flash_list	list[0];
+};
 
-#ifdef CONFIG_MTD_PARTITIONS
-static int parse_flash_partitions(struct device_node *node,
-		struct mtd_partition **parts)
+static int of_flash_remove(struct platform_device *dev)
 {
-	int i, plen, retval = -ENOMEM;
-	const  u32  *part;
-	const  char *name;
-
-	part = of_get_property(node, "partitions", &plen);
-	if (part == NULL)
-		goto err;
-
-	retval = plen / (2 * sizeof(u32));
-	*parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
-	if (*parts == NULL) {
-		printk(KERN_ERR "Can't allocate the flash partition data!\n");
-		goto err;
+	struct of_flash *info;
+	int i;
+
+	info = dev_get_drvdata(&dev->dev);
+	if (!info)
+		return 0;
+	dev_set_drvdata(&dev->dev, NULL);
+
+	if (info->cmtd != info->list[0].mtd) {
+		mtd_device_unregister(info->cmtd);
+		mtd_concat_destroy(info->cmtd);
 	}
 
-	name = of_get_property(node, "partition-names", &plen);
+	if (info->cmtd)
+		mtd_device_unregister(info->cmtd);
 
-	for (i = 0; i < retval; i++) {
-		(*parts)[i].offset = *part++;
-		(*parts)[i].size   = *part & ~1;
-		if (*part++ & 1) /* bit 0 set signifies read only partition */
-			(*parts)[i].mask_flags = MTD_WRITEABLE;
+	for (i = 0; i < info->list_size; i++) {
+		if (info->list[i].mtd)
+			map_destroy(info->list[i].mtd);
 
-		if (name != NULL && plen > 0) {
-			int len = strlen(name) + 1;
+		if (info->list[i].map.virt)
+			iounmap(info->list[i].map.virt);
 
-			(*parts)[i].name = (char *)name;
-			plen -= len;
-			name += len;
-		} else
-			(*parts)[i].name = "unnamed";
+		if (info->list[i].res) {
+			release_resource(info->list[i].res);
+			kfree(info->list[i].res);
+		}
 	}
-err:
-	return retval;
+	return 0;
 }
-#endif
 
-static int of_physmap_remove(struct of_device *dev)
+static const char * const rom_probe_types[] = {
+	"cfi_probe", "jedec_probe", "map_rom" };
+
+/* Helper function to handle probing of the obsolete "direct-mapped"
+ * compatible binding, which has an extra "probe-type" property
+ * describing the type of flash probe necessary. */
+static struct mtd_info *obsolete_probe(struct platform_device *dev,
+				       struct map_info *map)
 {
-	struct physmap_flash_info *info;
+	struct device_node *dp = dev->dev.of_node;
+	const char *of_probe;
+	struct mtd_info *mtd;
+	int i;
 
-	info = dev_get_drvdata(&dev->dev);
-	if (info == NULL)
-		return 0;
-	dev_set_drvdata(&dev->dev, NULL);
+	dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
+		 "flash binding\n");
 
-	if (info->mtd != NULL) {
-#ifdef CONFIG_MTD_PARTITIONS
-		if (info->nr_parts) {
-			del_mtd_partitions(info->mtd);
-			kfree(info->parts);
-		} else {
-			del_mtd_device(info->mtd);
+	of_probe = of_get_property(dp, "probe-type", NULL);
+	if (!of_probe) {
+		for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
+			mtd = do_map_probe(rom_probe_types[i], map);
+			if (mtd)
+				return mtd;
 		}
-#else
-		del_mtd_device(info->mtd);
-#endif
-		map_destroy(info->mtd);
+		return NULL;
+	} else if (strcmp(of_probe, "CFI") == 0) {
+		return do_map_probe("cfi_probe", map);
+	} else if (strcmp(of_probe, "JEDEC") == 0) {
+		return do_map_probe("jedec_probe", map);
+	} else {
+		if (strcmp(of_probe, "ROM") != 0)
+			dev_warn(&dev->dev, "obsolete_probe: don't know probe "
+				 "type '%s', mapping as rom\n", of_probe);
+		return do_map_probe("mtd_rom", map);
 	}
+}
 
-	if (info->map.virt != NULL)
-		iounmap(info->map.virt);
+/* When partitions are set we look for a linux,part-probe property which
+   specifies the list of partition probers to use. If none is given then the
+   default is use. These take precedence over other device tree
+   information. */
+static const char * const part_probe_types_def[] = {
+	"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
 
-	if (info->res != NULL) {
-		release_resource(info->res);
-		kfree(info->res);
+static const char * const *of_get_probes(struct device_node *dp)
+{
+	const char *cp;
+	int cplen;
+	unsigned int l;
+	unsigned int count;
+	const char **res;
+
+	cp = of_get_property(dp, "linux,part-probe", &cplen);
+	if (cp == NULL)
+		return part_probe_types_def;
+
+	count = 0;
+	for (l = 0; l != cplen; l++)
+		if (cp[l] == 0)
+			count++;
+
+	res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
+	count = 0;
+	while (cplen > 0) {
+		res[count] = cp;
+		l = strlen(cp) + 1;
+		cp += l;
+		cplen -= l;
+		count++;
 	}
+	return res;
+}
 
-	return 0;
+static void of_free_probes(const char * const *probes)
+{
+	if (probes != part_probe_types_def)
+		kfree(probes);
 }
 
-static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
+static struct of_device_id of_flash_match[];
+static int of_flash_probe(struct platform_device *dev)
 {
-	struct device_node *dp = dev->node;
+	const char * const *part_probe_types;
+	const struct of_device_id *match;
+	struct device_node *dp = dev->dev.of_node;
 	struct resource res;
-	struct physmap_flash_info *info;
-	const char **probe_type;
-	const char *of_probe;
-	const u32 *width;
+	struct of_flash *info;
+	const char *probe_type;
+	const __be32 *width;
 	int err;
-
-
-	if (of_address_to_resource(dp, 0, &res)) {
-		dev_err(&dev->dev, "Can't get the flash mapping!\n");
+	int i;
+	int count;
+	const __be32 *p;
+	int reg_tuple_size;
+	struct mtd_info **mtd_list = NULL;
+	resource_size_t res_size;
+	struct mtd_part_parser_data ppdata;
+	bool map_indirect;
+	const char *mtd_name = NULL;
+
+	match = of_match_device(of_flash_match, &dev->dev);
+	if (!match)
+		return -EINVAL;
+	probe_type = match->data;
+
+	reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32);
+
+	of_property_read_string(dp, "linux,mtd-name", &mtd_name);
+
+	/*
+	 * Get number of "reg" tuples. Scan for MTD devices on area's
+	 * described by each "reg" region. This makes it possible (including
+	 * the concat support) to support the Intel P30 48F4400 chips which
+	 * consists internally of 2 non-identical NOR chips on one die.
+	 */
+	p = of_get_property(dp, "reg", &count);
+	if (count % reg_tuple_size != 0) {
+		dev_err(&dev->dev, "Malformed reg property on %s\n",
+				dev->dev.of_node->full_name);
 		err = -EINVAL;
-		goto err_out;
+		goto err_flash_remove;
 	}
+	count /= reg_tuple_size;
 
-       	dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
-	    (unsigned long long)res.end - res.start + 1,
-	    (unsigned long long)res.start);
+	map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
 
-	info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
-	if (info == NULL) {
-		err = -ENOMEM;
-		goto err_out;
-	}
-	memset(info, 0, sizeof(*info));
+	err = -ENOMEM;
+	info = devm_kzalloc(&dev->dev,
+			    sizeof(struct of_flash) +
+			    sizeof(struct of_flash_list) * count, GFP_KERNEL);
+	if (!info)
+		goto err_flash_remove;
 
 	dev_set_drvdata(&dev->dev, info);
 
-	info->res = request_mem_region(res.start, res.end - res.start + 1,
-			dev->dev.bus_id);
-	if (info->res == NULL) {
-		dev_err(&dev->dev, "Could not reserve memory region\n");
-		err = -ENOMEM;
-		goto err_out;
-	}
+	mtd_list = kzalloc(sizeof(*mtd_list) * count, GFP_KERNEL);
+	if (!mtd_list)
+		goto err_flash_remove;
 
-	width = of_get_property(dp, "bank-width", NULL);
-	if (width == NULL) {
-		dev_err(&dev->dev, "Can't get the flash bank width!\n");
-		err = -EINVAL;
-		goto err_out;
-	}
+	for (i = 0; i < count; i++) {
+		err = -ENXIO;
+		if (of_address_to_resource(dp, i, &res)) {
+			/*
+			 * Continue with next register tuple if this
+			 * one is not mappable
+			 */
+			continue;
+		}
 
-	info->map.name = dev->dev.bus_id;
-	info->map.phys = res.start;
-	info->map.size = res.end - res.start + 1;
-	info->map.bankwidth = *width;
+		dev_dbg(&dev->dev, "of_flash device: %pR\n", &res);
 
-	info->map.virt = ioremap(info->map.phys, info->map.size);
-	if (info->map.virt == NULL) {
-		dev_err(&dev->dev, "Failed to ioremap flash region\n");
-		err = EIO;
-		goto err_out;
-	}
+		err = -EBUSY;
+		res_size = resource_size(&res);
+		info->list[i].res = request_mem_region(res.start, res_size,
+						       dev_name(&dev->dev));
+		if (!info->list[i].res)
+			goto err_out;
 
-	simple_map_init(&info->map);
+		err = -ENXIO;
+		width = of_get_property(dp, "bank-width", NULL);
+		if (!width) {
+			dev_err(&dev->dev, "Can't get bank width from device"
+				" tree\n");
+			goto err_out;
+		}
 
-	of_probe = of_get_property(dp, "probe-type", NULL);
-	if (of_probe == NULL) {
-		probe_type = rom_probe_types;
-		for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
-			info->mtd = do_map_probe(*probe_type, &info->map);
-	} else if (!strcmp(of_probe, "CFI"))
-		info->mtd = do_map_probe("cfi_probe", &info->map);
-	else if (!strcmp(of_probe, "JEDEC"))
-		info->mtd = do_map_probe("jedec_probe", &info->map);
-	else {
- 		if (strcmp(of_probe, "ROM"))
-			dev_dbg(&dev->dev, "map_probe: don't know probe type "
-			"'%s', mapping as rom\n", of_probe);
-		info->mtd = do_map_probe("mtd_rom", &info->map);
+		info->list[i].map.name = mtd_name ?: dev_name(&dev->dev);
+		info->list[i].map.phys = res.start;
+		info->list[i].map.size = res_size;
+		info->list[i].map.bankwidth = be32_to_cpup(width);
+		info->list[i].map.device_node = dp;
+
+		err = -ENOMEM;
+		info->list[i].map.virt = ioremap(info->list[i].map.phys,
+						 info->list[i].map.size);
+		if (!info->list[i].map.virt) {
+			dev_err(&dev->dev, "Failed to ioremap() flash"
+				" region\n");
+			goto err_out;
+		}
+
+		simple_map_init(&info->list[i].map);
+
+		/*
+		 * On some platforms (e.g. MPC5200) a direct 1:1 mapping
+		 * may cause problems with JFFS2 usage, as the local bus (LPB)
+		 * doesn't support unaligned accesses as implemented in the
+		 * JFFS2 code via memcpy(). By setting NO_XIP, the
+		 * flash will not be exposed directly to the MTD users
+		 * (e.g. JFFS2) any more.
+		 */
+		if (map_indirect)
+			info->list[i].map.phys = NO_XIP;
+
+		if (probe_type) {
+			info->list[i].mtd = do_map_probe(probe_type,
+							 &info->list[i].map);
+		} else {
+			info->list[i].mtd = obsolete_probe(dev,
+							   &info->list[i].map);
+		}
+		mtd_list[i] = info->list[i].mtd;
+
+		err = -ENXIO;
+		if (!info->list[i].mtd) {
+			dev_err(&dev->dev, "do_map_probe() failed\n");
+			goto err_out;
+		} else {
+			info->list_size++;
+		}
+		info->list[i].mtd->owner = THIS_MODULE;
+		info->list[i].mtd->dev.parent = &dev->dev;
+	}
+
+	err = 0;
+	info->cmtd = NULL;
+	if (info->list_size == 1) {
+		info->cmtd = info->list[0].mtd;
+	} else if (info->list_size > 1) {
+		/*
+		 * We detected multiple devices. Concatenate them together.
+		 */
+		info->cmtd = mtd_concat_create(mtd_list, info->list_size,
+					       dev_name(&dev->dev));
 	}
-	if (info->mtd == NULL) {
-		dev_err(&dev->dev, "map_probe failed\n");
+	if (info->cmtd == NULL)
 		err = -ENXIO;
+
+	if (err)
 		goto err_out;
-	}
-	info->mtd->owner = THIS_MODULE;
-
-#ifdef CONFIG_MTD_PARTITIONS
-	err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
-	if (err > 0) {
-		add_mtd_partitions(info->mtd, info->parts, err);
-	} else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
-		dev_info(&dev->dev, "Using OF partition information\n");
-		add_mtd_partitions(info->mtd, info->parts, err);
-		info->nr_parts = err;
-	} else
-#endif
-
-	add_mtd_device(info->mtd);
-	return 0;
 
-err_out:
-	of_physmap_remove(dev);
-	return err;
+	ppdata.of_node = dp;
+	part_probe_types = of_get_probes(dp);
+	mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
+			NULL, 0);
+	of_free_probes(part_probe_types);
+
+	kfree(mtd_list);
 
 	return 0;
 
+err_out:
+	kfree(mtd_list);
+err_flash_remove:
+	of_flash_remove(dev);
 
+	return err;
 }
 
-static struct of_device_id of_physmap_match[] = {
+static struct of_device_id of_flash_match[] = {
+	{
+		.compatible	= "cfi-flash",
+		.data		= (void *)"cfi_probe",
+	},
+	{
+		/* FIXME: JEDEC chips can't be safely and reliably
+		 * probed, although the mtd code gets it right in
+		 * practice most of the time.  We should use the
+		 * vendor and device ids specified by the binding to
+		 * bypass the heuristic probe code, but the mtd layer
+		 * provides, at present, no interface for doing so
+		 * :(. */
+		.compatible	= "jedec-flash",
+		.data		= (void *)"jedec_probe",
+	},
+	{
+		.compatible     = "mtd-ram",
+		.data           = (void *)"map_ram",
+	},
 	{
 		.type		= "rom",
 		.compatible	= "direct-mapped"
 	},
 	{ },
 };
+MODULE_DEVICE_TABLE(of, of_flash_match);
 
-MODULE_DEVICE_TABLE(of, of_physmap_match);
-
-
-static struct of_platform_driver of_physmap_flash_driver = {
-	.name		= "physmap-flash",
-	.match_table	= of_physmap_match,
-	.probe		= of_physmap_probe,
-	.remove		= of_physmap_remove,
+static struct platform_driver of_flash_driver = {
+	.driver = {
+		.name = "of-flash",
+		.owner = THIS_MODULE,
+		.of_match_table = of_flash_match,
+	},
+	.probe		= of_flash_probe,
+	.remove		= of_flash_remove,
 };
 
-static int __init of_physmap_init(void)
-{
-	return of_register_platform_driver(&of_physmap_flash_driver);
-}
-
-static void __exit of_physmap_exit(void)
-{
-	of_unregister_platform_driver(&of_physmap_flash_driver);
-}
-
-module_init(of_physmap_init);
-module_exit(of_physmap_exit);
+module_platform_driver(of_flash_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
-MODULE_DESCRIPTION("Configurable MTD map driver for OF");
+MODULE_DESCRIPTION("Device tree based MTD map driver");