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authorMichael Abbott <michael.abbott@diamond.ac.uk>2013-10-16 11:41:33 +0300
committerDavid S. Miller <davem@davemloft.net>2013-10-17 13:35:56 -0400
commit09ee9f87d02e779e4fc3f5c29212c733d6d6e349 (patch)
tree8110bb3b546ae52f7d8a1a93d41bb30ac7dc850e /drivers/net/ethernet/davicom
parent677d7d28686e468b4940c573ab2a01b198084bc4 (diff)
downloadlinux-09ee9f87d02e779e4fc3f5c29212c733d6d6e349.tar.bz2
dm9000: Implement full reset of DM9000 network device
A Davicom application note for the DM9000 network device recommends performing software reset twice to correctly initialise the device. Without this reset some devices fail to initialise correctly on system startup. Cc: David S. Miller <davem@davemloft.net> Cc: Jingoo Han <jg1.han@samsung.com> Cc: Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/davicom')
-rw-r--r--drivers/net/ethernet/davicom/dm9000.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index 3f650ce10cf4..a179f8150034 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -158,18 +158,6 @@ static inline board_info_t *to_dm9000_board(struct net_device *dev)
/* DM9000 network board routine ---------------------------- */
-static void
-dm9000_reset(board_info_t * db)
-{
- dev_dbg(db->dev, "resetting device\n");
-
- /* RESET device */
- writeb(DM9000_NCR, db->io_addr);
- udelay(200);
- writeb(NCR_RST, db->io_data);
- udelay(200);
-}
-
/*
* Read a byte from I/O port
*/
@@ -191,6 +179,27 @@ iow(board_info_t * db, int reg, int value)
writeb(value, db->io_data);
}
+static void
+dm9000_reset(board_info_t *db)
+{
+ dev_dbg(db->dev, "resetting device\n");
+
+ /* Reset DM9000, see DM9000 Application Notes V1.22 Jun 11, 2004 page 29
+ * The essential point is that we have to do a double reset, and the
+ * instruction is to set LBK into MAC internal loopback mode.
+ */
+ iow(db, DM9000_NCR, 0x03);
+ udelay(100); /* Application note says at least 20 us */
+ if (ior(db, DM9000_NCR) & 1)
+ dev_err(db->dev, "dm9000 did not respond to first reset\n");
+
+ iow(db, DM9000_NCR, 0);
+ iow(db, DM9000_NCR, 0x03);
+ udelay(100);
+ if (ior(db, DM9000_NCR) & 1)
+ dev_err(db->dev, "dm9000 did not respond to second reset\n");
+}
+
/* routines for sending block to chip */
static void dm9000_outblk_8bit(void __iomem *reg, void *data, int count)