| Message ID | 1276587015-13506-1-git-send-email-agust@denx.de |
|---|---|
| State | Accepted |
| Commit | dd02b67d5e9e7896891fa27eb5db65f55a290998 |
| Headers | show |
On Tue, Jun 15, 2010 at 03:30, Anatolij Gustschin wrote: > 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. i dont really have a way of testing the MMU path, but this looks sane. Acked-by: Mike Frysinger <vapier@gentoo.org> -mike
On Tue, 2010-06-15 at 09:30 +0200, Anatolij Gustschin wrote: > 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> Pushed to l2-mtd-2.6.git / dunno
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 8b223c0..c3e5423 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> @@ -941,9 +942,34 @@ 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;
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> --- Changes since v3: - remove vma->vm_pgoff check as suggested by Mike - update commit message Changes since v2: - improved commit message and patch description - rebased to apply cleanly on current mtd-2.6 tree drivers/mtd/mtdchar.c | 28 +++++++++++++++++++++++++++- 1 files changed, 27 insertions(+), 1 deletions(-)