diff options
| author | Anatolij Gustschin <agust@denx.de> | 2010-06-15 09:30:15 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-08-04 10:57:33 +0100 |
| commit | dd02b67d5e9e7896891fa27eb5db65f55a290998 (patch) | |
| tree | 9e7236232878a894cbb745d68411fe8f54e35ec4 /drivers/mtd | |
| parent | 68640c2a416849ba8e0a69577d4be51a458a045a (diff) | |
| download | linux-dd02b67d5e9e7896891fa27eb5db65f55a290998.tar.bz2 | |
mtd: mtdchar: fix mmap for MTD RAM/ROM char devices
For no-mmu systems mmap() on RAM/ROM devices already works
but for systems with mmu it probably was not tested and
doesn't work.
This patch allows using mmap() on MTD RAM/ROM devices on systems
with MMU. It has been tested on mpc5121e based platform with
MR0A16A MRAM device attached over LocalBus.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdchar.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index a8e69dd2b2e4..c27e65e3e291 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -18,6 +18,7 @@ #include <linux/mount.h> #include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> #include <linux/mtd/compatmac.h> #include <asm/uaccess.h> @@ -955,9 +956,34 @@ 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; + struct map_info *map = mtd->priv; + unsigned long start; + unsigned long off; + u32 len; + + if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { + off = vma->vm_pgoff << PAGE_SHIFT; + start = map->phys; + len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); + start &= PAGE_MASK; + if ((vma->vm_end - vma->vm_start + off) > len) + return -EINVAL; + + off += start; + vma->vm_pgoff = off >> PAGE_SHIFT; + vma->vm_flags |= VM_IO | VM_RESERVED; + +#ifdef pgprot_noncached + if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); +#endif + if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) + return -EAGAIN; - if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) return 0; + } return -ENOSYS; #else return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; |