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authorNicolas Pitre <nico@cam.org>2009-05-31 22:25:40 -0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-06-08 07:26:59 -0400
commitbfee1a4311702c9fdecd8264ffd1126fd0ce92fb (patch)
tree71cdaa7d43688b6ee2a14210f4ec2391a7b84c62 /drivers/mtd
parent9dbc090274668abe3fc9f3a5de490d7d412cd74a (diff)
mtd: orion_nand: use burst reads with double word accesses
This is not 8 times faster than byte access, but still around 60% faster. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/orion_nand.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
index c2dfd3ea353d..7ad972229db4 100644
--- a/drivers/mtd/nand/orion_nand.c
+++ b/drivers/mtd/nand/orion_nand.c
@@ -47,6 +47,28 @@ static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl
47 writeb(cmd, nc->IO_ADDR_W + offs); 47 writeb(cmd, nc->IO_ADDR_W + offs);
48} 48}
49 49
50static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
51{
52 struct nand_chip *chip = mtd->priv;
53 void __iomem *io_base = chip->IO_ADDR_R;
54 uint64_t *buf64;
55 int i = 0;
56
57 while (len && (unsigned long)buf & 7) {
58 *buf++ = readb(io_base);
59 len--;
60 }
61 buf64 = (uint64_t *)buf;
62 while (i < len/8) {
63 uint64_t x;
64 asm ("ldrd\t%0, [%1]" : "=r" (x) : "r" (io_base));
65 buf64[i++] = x;
66 }
67 i *= 8;
68 while (i < len)
69 buf[i++] = readb(io_base);
70}
71
50static int __init orion_nand_probe(struct platform_device *pdev) 72static int __init orion_nand_probe(struct platform_device *pdev)
51{ 73{
52 struct mtd_info *mtd; 74 struct mtd_info *mtd;
@@ -83,6 +105,7 @@ static int __init orion_nand_probe(struct platform_device *pdev)
83 nc->priv = board; 105 nc->priv = board;
84 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base; 106 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
85 nc->cmd_ctrl = orion_nand_cmd_ctrl; 107 nc->cmd_ctrl = orion_nand_cmd_ctrl;
108 nc->read_buf = orion_nand_read_buf;
86 nc->ecc.mode = NAND_ECC_SOFT; 109 nc->ecc.mode = NAND_ECC_SOFT;
87 110
88 if (board->chip_delay) 111 if (board->chip_delay)