diff options
| -rw-r--r-- | drivers/mtd/Makefile | 2 | ||||
| -rw-r--r-- | drivers/mtd/chips/map_ram.c | 17 | ||||
| -rw-r--r-- | drivers/mtd/chips/map_rom.c | 17 | ||||
| -rw-r--r-- | drivers/mtd/devices/mtdram.c | 14 | ||||
| -rw-r--r-- | drivers/mtd/internal.h | 17 | ||||
| -rw-r--r-- | drivers/mtd/mtdbdi.c | 43 | ||||
| -rw-r--r-- | drivers/mtd/mtdchar.c | 63 | ||||
| -rw-r--r-- | drivers/mtd/mtdcore.c | 15 | ||||
| -rw-r--r-- | drivers/mtd/mtdpart.c | 15 | ||||
| -rw-r--r-- | include/linux/mtd/mtd.h | 14 |
10 files changed, 215 insertions, 2 deletions
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index 4521b1e..82d1e4d 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -4,7 +4,7 @@ # Core functionality. obj-$(CONFIG_MTD) += mtd.o -mtd-y := mtdcore.o mtdsuper.o +mtd-y := mtdcore.o mtdsuper.o mtdbdi.o mtd-$(CONFIG_MTD_PARTITIONS) += mtdpart.o obj-$(CONFIG_MTD_CONCAT) += mtdconcat.o diff --git a/drivers/mtd/chips/map_ram.c b/drivers/mtd/chips/map_ram.c index 072dd8a..6bdc50c 100644 --- a/drivers/mtd/chips/map_ram.c +++ b/drivers/mtd/chips/map_ram.c @@ -21,6 +21,8 @@ static int mapram_write (struct mtd_info *, loff_t, size_t, size_t *, const u_ch static int mapram_erase (struct mtd_info *, struct erase_info *); static void mapram_nop (struct mtd_info *); static struct mtd_info *map_ram_probe(struct map_info *map); +static unsigned long mapram_unmapped_area(struct mtd_info *, unsigned long, + unsigned long, unsigned long); static struct mtd_chip_driver mapram_chipdrv = { @@ -64,6 +66,7 @@ static struct mtd_info *map_ram_probe(struct map_info *map) mtd->type = MTD_RAM; mtd->size = map->size; mtd->erase = mapram_erase; + mtd->get_unmapped_area = mapram_unmapped_area; mtd->read = mapram_read; mtd->write = mapram_write; mtd->sync = mapram_nop; @@ -79,6 +82,20 @@ static struct mtd_info *map_ram_probe(struct map_info *map) } +/* + * Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ +static unsigned long mapram_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + struct map_info *map = mtd->priv; + return (unsigned long) map->virt + offset; +} + static int mapram_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct map_info *map = mtd->priv; diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c index c76d6e5..076090a 100644 --- a/drivers/mtd/chips/map_rom.c +++ b/drivers/mtd/chips/map_rom.c @@ -20,6 +20,8 @@ static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_ch static void maprom_nop (struct mtd_info *); static struct mtd_info *map_rom_probe(struct map_info *map); static int maprom_erase (struct mtd_info *mtd, struct erase_info *info); +static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long, + unsigned long, unsigned long); static struct mtd_chip_driver maprom_chipdrv = { .probe = map_rom_probe, @@ -40,6 +42,7 @@ static struct mtd_info *map_rom_probe(struct map_info *map) mtd->name = map->name; mtd->type = MTD_ROM; mtd->size = map->size; + mtd->get_unmapped_area = maprom_unmapped_area; mtd->read = maprom_read; mtd->write = maprom_write; mtd->sync = maprom_nop; @@ -53,6 +56,20 @@ static struct mtd_info *map_rom_probe(struct map_info *map) } +/* + * Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ +static unsigned long maprom_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + struct map_info *map = mtd->priv; + return (unsigned long) map->virt + offset; +} + static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct map_info *map = mtd->priv; diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c index 3aaca88..fce5ff7 100644 --- a/drivers/mtd/devices/mtdram.c +++ b/drivers/mtd/devices/mtdram.c @@ -65,6 +65,19 @@ static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) { } +/* + * Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ +static unsigned long ram_get_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + return (unsigned long) mtd->priv + offset; +} + static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { @@ -116,6 +129,7 @@ int mtdram_init_device(struct mtd_info *mtd, void *mapped_address, mtd->erase = ram_erase; mtd->point = ram_point; mtd->unpoint = ram_unpoint; + mtd->get_unmapped_area = ram_get_unmapped_area; mtd->read = ram_read; mtd->write = ram_write; diff --git a/drivers/mtd/internal.h b/drivers/mtd/internal.h new file mode 100644 index 0000000..c658fe7 --- /dev/null +++ b/drivers/mtd/internal.h @@ -0,0 +1,17 @@ +/* Internal MTD definitions + * + * Copyright © 2006 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * 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. + */ + +/* + * mtdbdi.c + */ +extern struct backing_dev_info mtd_bdi_unmappable; +extern struct backing_dev_info mtd_bdi_ro_mappable; +extern struct backing_dev_info mtd_bdi_rw_mappable; diff --git a/drivers/mtd/mtdbdi.c b/drivers/mtd/mtdbdi.c new file mode 100644 index 0000000..5ca5aed --- /dev/null +++ b/drivers/mtd/mtdbdi.c @@ -0,0 +1,43 @@ +/* MTD backing device capabilities + * + * Copyright © 2006 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * 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 <linux/backing-dev.h> +#include <linux/mtd/mtd.h> +#include "internal.h" + +/* + * backing device capabilities for non-mappable devices (such as NAND flash) + * - permits private mappings, copies are taken of the data + */ +struct backing_dev_info mtd_bdi_unmappable = { + .capabilities = BDI_CAP_MAP_COPY, +}; + +/* + * backing device capabilities for R/O mappable devices (such as ROM) + * - permits private mappings, copies are taken of the data + * - permits non-writable shared mappings + */ +struct backing_dev_info mtd_bdi_ro_mappable = { + .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | + BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), +}; + +/* + * backing device capabilities for writable mappable devices (such as RAM) + * - permits private mappings, copies are taken of the data + * - permits non-writable shared mappings + */ +struct backing_dev_info mtd_bdi_rw_mappable = { + .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | + BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | + BDI_CAP_WRITE_MAP), +}; diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 2c8a16f..f478f1f 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -13,6 +13,7 @@ #include <linux/slab.h> #include <linux/sched.h> #include <linux/smp_lock.h> +#include <linux/backing-dev.h> #include <linux/mtd/mtd.h> #include <linux/mtd/compatmac.h> @@ -107,12 +108,15 @@ static int mtd_open(struct inode *inode, struct file *file) goto out; } - if (MTD_ABSENT == mtd->type) { + if (mtd->type == MTD_ABSENT) { put_mtd_device(mtd); ret = -ENODEV; goto out; } + if (mtd->backing_dev_info) + file->f_mapping->backing_dev_info = mtd->backing_dev_info; + /* You can't open it RW if it's not a writeable device */ if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { put_mtd_device(mtd); @@ -781,6 +785,59 @@ static int mtd_ioctl(struct inode *inode, struct file *file, return ret; } /* memory_ioctl */ +/* + * try to determine where a shared mapping can be made + * - only supported for NOMMU at the moment (MMU can't doesn't copy private + * mappings) + */ +#ifndef CONFIG_MMU +static unsigned long mtd_get_unmapped_area(struct file *file, + unsigned long addr, + unsigned long len, + unsigned long pgoff, + unsigned long flags) +{ + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; + + if (mtd->get_unmapped_area) { + unsigned long offset; + + if (addr != 0) + return (unsigned long) -EINVAL; + + if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) + return (unsigned long) -EINVAL; + + offset = pgoff << PAGE_SHIFT; + if (offset > mtd->size - len) + return (unsigned long) -EINVAL; + + return mtd->get_unmapped_area(mtd, len, offset, flags); + } + + /* can't map directly */ + return (unsigned long) -ENOSYS; +} +#endif + +/* + * set up a mapping for shared memory segments + */ +static int mtd_mmap(struct file *file, struct vm_area_struct *vma) +{ +#ifdef CONFIG_MMU + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; + + if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) + return 0; + return -ENOSYS; +#else + return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; +#endif +} + static const struct file_operations mtd_fops = { .owner = THIS_MODULE, .llseek = mtd_lseek, @@ -789,6 +846,10 @@ static const struct file_operations mtd_fops = { .ioctl = mtd_ioctl, .open = mtd_open, .release = mtd_close, + .mmap = mtd_mmap, +#ifndef CONFIG_MMU + .get_unmapped_area = mtd_get_unmapped_area, +#endif }; static int __init init_mtdchar(void) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 76fe0a1..65a7f37 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -19,6 +19,7 @@ #include <linux/proc_fs.h> #include <linux/mtd/mtd.h> +#include "internal.h" #include "mtdcore.h" @@ -46,6 +47,20 @@ int add_mtd_device(struct mtd_info *mtd) { int i; + if (!mtd->backing_dev_info) { + switch (mtd->type) { + case MTD_RAM: + mtd->backing_dev_info = &mtd_bdi_rw_mappable; + break; + case MTD_ROM: + mtd->backing_dev_info = &mtd_bdi_ro_mappable; + break; + default: + mtd->backing_dev_info = &mtd_bdi_unmappable; + break; + } + } + BUG_ON(mtd->writesize == 0); mutex_lock(&mtd_table_mutex); diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index 144e6b6..06d5b9d 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -84,6 +84,18 @@ static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) part->master->unpoint(part->master, from + part->offset, len); } +static unsigned long part_get_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + struct mtd_part *part = PART(mtd); + + offset += part->offset; + return part->master->get_unmapped_area(part->master, len, offset, + flags); +} + static int part_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { @@ -342,6 +354,7 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, slave->mtd.name = part->name; slave->mtd.owner = master->owner; + slave->mtd.backing_dev_info = master->backing_dev_info; slave->mtd.read = part_read; slave->mtd.write = part_write; @@ -354,6 +367,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, slave->mtd.unpoint = part_unpoint; } + if (master->get_unmapped_area) + slave->mtd.get_unmapped_area = part_get_unmapped_area; if (master->read_oob) slave->mtd.read_oob = part_read_oob; if (master->write_oob) diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 3aa5d77..0c079fd 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -162,6 +162,20 @@ struct mtd_info { /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len); + /* Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ + unsigned long (*get_unmapped_area) (struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags); + + /* Backing device capabilities for this device + * - provides mmap capabilities + */ + struct backing_dev_info *backing_dev_info; + int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); |