diff options
Diffstat (limited to 'drivers/mtd/devices/mtdram.c')
| -rw-r--r-- | drivers/mtd/devices/mtdram.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c index cbd8547d7aad..0bf4aeaf0cb8 100644 --- a/drivers/mtd/devices/mtdram.c +++ b/drivers/mtd/devices/mtdram.c @@ -13,6 +13,7 @@ #include <linux/slab.h> #include <linux/ioport.h> #include <linux/vmalloc.h> +#include <linux/mm.h> #include <linux/init.h> #include <linux/mtd/mtd.h> #include <linux/mtd/mtdram.h> @@ -69,6 +70,27 @@ static int ram_point(struct mtd_info *mtd, loff_t from, size_t len, { *virt = mtd->priv + from; *retlen = len; + + if (phys) { + /* limit retlen to the number of contiguous physical pages */ + unsigned long page_ofs = offset_in_page(*virt); + void *addr = *virt - page_ofs; + unsigned long pfn1, pfn0 = vmalloc_to_pfn(addr); + + *phys = __pfn_to_phys(pfn0) + page_ofs; + len += page_ofs; + while (len > PAGE_SIZE) { + len -= PAGE_SIZE; + addr += PAGE_SIZE; + pfn0++; + pfn1 = vmalloc_to_pfn(addr); + if (pfn1 != pfn0) { + *retlen = addr - *virt; + break; + } + } + } + return 0; } @@ -77,19 +99,6 @@ static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) return 0; } -/* - * 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) { @@ -134,7 +143,6 @@ 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; |