From 9a310d21196f38f6ad0ad146057548653e495c09 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 15 Jan 2008 17:54:43 -0600 Subject: [MTD] Factor out OF partition support from the NOR driver. Signed-off-by: Scott Wood Signed-off-by: David Woodhouse --- drivers/mtd/Kconfig | 8 ++++ drivers/mtd/Makefile | 1 + drivers/mtd/maps/physmap_of.c | 89 +++++++++++++----------------------------- drivers/mtd/ofpart.c | 74 +++++++++++++++++++++++++++++++++++ include/linux/mtd/partitions.h | 9 ++++- 5 files changed, 118 insertions(+), 63 deletions(-) create mode 100644 drivers/mtd/ofpart.c diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index 661eac09f5c..e8503341e3b 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -150,6 +150,14 @@ config MTD_AFS_PARTS for your particular device. It won't happen automatically. The 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example. +config MTD_OF_PARTS + tristate "Flash partition map based on OF description" + depends on PPC_OF && MTD_PARTITIONS + help + This provides a partition parsing function which derives + the partition map from the children of the flash node, + as described in Documentation/powerpc/booting-without-of.txt. + comment "User Modules And Translation Layers" config MTD_CHAR diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index 7f0b04b4caa..538e33d11d4 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_MTD_CONCAT) += mtdconcat.o obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o obj-$(CONFIG_MTD_AFS_PARTS) += afs.o +obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o # 'Users' - code which presents functionality to userspace. obj-$(CONFIG_MTD_CHAR) += mtdchar.o diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c index d4bcd3f8c57..49acd417189 100644 --- a/drivers/mtd/maps/physmap_of.c +++ b/drivers/mtd/maps/physmap_of.c @@ -80,65 +80,6 @@ static int parse_obsolete_partitions(struct of_device *dev, return nr_parts; } - -static int __devinit parse_partitions(struct of_flash *info, - struct of_device *dev) -{ - const char *partname; - static const char *part_probe_types[] - = { "cmdlinepart", "RedBoot", NULL }; - struct device_node *dp = dev->node, *pp; - int nr_parts, i; - - /* First look for RedBoot table or partitions on the command - * line, these take precedence over device tree information */ - nr_parts = parse_mtd_partitions(info->mtd, part_probe_types, - &info->parts, 0); - if (nr_parts > 0) - return nr_parts; - - /* First count the subnodes */ - nr_parts = 0; - for (pp = of_get_next_child(dp, NULL); pp; - pp = of_get_next_child(dp, pp)) - nr_parts++; - - if (nr_parts == 0) - return parse_obsolete_partitions(dev, info, dp); - - info->parts = kzalloc(nr_parts * sizeof(*info->parts), - GFP_KERNEL); - if (!info->parts) - return -ENOMEM; - - for (pp = of_get_next_child(dp, NULL), i = 0; pp; - pp = of_get_next_child(dp, pp), i++) { - const u32 *reg; - int len; - - reg = of_get_property(pp, "reg", &len); - if (!reg || (len != 2*sizeof(u32))) { - of_node_put(pp); - dev_err(&dev->dev, "Invalid 'reg' on %s\n", - dp->full_name); - kfree(info->parts); - info->parts = NULL; - return -EINVAL; - } - info->parts[i].offset = reg[0]; - info->parts[i].size = reg[1]; - - partname = of_get_property(pp, "label", &len); - if (!partname) - partname = of_get_property(pp, "name", &len); - info->parts[i].name = (char *)partname; - - if (of_get_property(pp, "read-only", &len)) - info->parts[i].mask_flags = MTD_WRITEABLE; - } - - return nr_parts; -} #else /* MTD_PARTITIONS */ #define OF_FLASH_PARTS(info) (0) #define parse_partitions(info, dev) (0) @@ -213,6 +154,10 @@ static struct mtd_info * __devinit obsolete_probe(struct of_device *dev, static int __devinit of_flash_probe(struct of_device *dev, const struct of_device_id *match) { +#ifdef CONFIG_MTD_PARTITIONS + static const char *part_probe_types[] + = { "cmdlinepart", "RedBoot", NULL }; +#endif struct device_node *dp = dev->node; struct resource res; struct of_flash *info; @@ -275,13 +220,33 @@ static int __devinit of_flash_probe(struct of_device *dev, } info->mtd->owner = THIS_MODULE; - err = parse_partitions(info, dev); +#ifdef CONFIG_MTD_PARTITIONS + /* First look for RedBoot table or partitions on the command + * line, these take precedence over device tree information */ + err = parse_mtd_partitions(info->mtd, part_probe_types, + &info->parts, 0); if (err < 0) - goto err_out; + return err; + +#ifdef CONFIG_MTD_OF_PARTS + if (err == 0) { + err = of_mtd_parse_partitions(&dev->dev, info->mtd, + dp, &info->parts); + if (err < 0) + return err; + } +#endif + + if (err == 0) { + err = parse_obsolete_partitions(dev, info, dp); + if (err < 0) + return err; + } if (err > 0) - add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err); + add_mtd_partitions(info->mtd, info->parts, err); else +#endif add_mtd_device(info->mtd); return 0; diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c new file mode 100644 index 00000000000..f86e06934cd --- /dev/null +++ b/drivers/mtd/ofpart.c @@ -0,0 +1,74 @@ +/* + * Flash partitions described by the OF (or flattened) device tree + * + * Copyright (C) 2006 MontaVista Software Inc. + * Author: Vitaly Wool + * + * 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 + * option) any later version. + */ + +#include +#include +#include +#include +#include + +int __devinit of_mtd_parse_partitions(struct device *dev, + struct mtd_info *mtd, + struct device_node *node, + struct mtd_partition **pparts) +{ + const char *partname; + struct device_node *pp; + int nr_parts, i; + + /* First count the subnodes */ + pp = NULL; + nr_parts = 0; + while ((pp = of_get_next_child(node, pp))) + nr_parts++; + + if (nr_parts == 0) + return 0; + + *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); + if (!*pparts) + return -ENOMEM; + + pp = NULL; + i = 0; + while ((pp = of_get_next_child(node, pp))) { + const u32 *reg; + int len; + + reg = of_get_property(pp, "reg", &len); + if (!reg || (len != 2 * sizeof(u32))) { + of_node_put(pp); + dev_err(dev, "Invalid 'reg' on %s\n", node->full_name); + kfree(*pparts); + *pparts = NULL; + return -EINVAL; + } + (*pparts)[i].offset = reg[0]; + (*pparts)[i].size = reg[1]; + + partname = of_get_property(pp, "label", &len); + if (!partname) + partname = of_get_property(pp, "name", &len); + (*pparts)[i].name = (char *)partname; + + if (of_get_property(pp, "read-only", &len)) + (*pparts)[i].mask_flags = MTD_WRITEABLE; + + i++; + } + + return nr_parts; +} +EXPORT_SYMBOL(of_mtd_parse_partitions); diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h index da6b3d6f12a..7c37d7e55ab 100644 --- a/include/linux/mtd/partitions.h +++ b/include/linux/mtd/partitions.h @@ -71,5 +71,12 @@ extern int parse_mtd_partitions(struct mtd_info *master, const char **types, #define put_partition_parser(p) do { module_put((p)->owner); } while(0) -#endif +struct device; +struct device_node; + +int __devinit of_mtd_parse_partitions(struct device *dev, + struct mtd_info *mtd, + struct device_node *node, + struct mtd_partition **pparts); +#endif -- cgit v1.2.3