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dm9000: clean up reset code 

* Change a hard-coded 0x3 to NCR_RST | NCR_MAC_LBK in dm9000_reset

* Every single place where dm9000_init_dm9000 was ran, a dm9000_reset
  was called immediately before-hand.  Bring dm9000_reset into
  dm9000_init_dm9000.

* The following commit updated the dm9000_probe reset routine to use NCR_RST
  | NCR_MAC_LBK:

    6741f40 DM9000B: driver initialization upgrade

  and a later commit added a bug-fix to always reset the chip twice:

    09ee9f8 dm9000: Implement full reset of DM9000 network device

  Unfortunately, since the changes in 6741f40 were made by replacing the
  dm9000_probe dm9000_reset with the adjusted iow(), the changes in
  09ee9f8 were not incorporated into the dm9000_probe reset.
  Furthermore, it bypassed the requisite reset-delay causing some boards
  to get at least one "read wrong id ..." dev_err message during
  dm9000_probe.

Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Ruder 2014-06-04 17:28:45 -05:00 committed by David S. Miller
parent 6b50d038e7
commit 751bb6fd80
1 changed files with 5 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/ethernet/davicom/dm9000.c
View File

@ -187,13 +187,13 @@ dm9000_reset(board_info_t *db)
* 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);
iow(db, DM9000_NCR, NCR_RST | NCR_MAC_LBK);
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);
iow(db, DM9000_NCR, NCR_RST | NCR_MAC_LBK);
udelay(100);
if (ior(db, DM9000_NCR) & 1)
dev_err(db->dev, "dm9000 did not respond to second reset\n");
@ -894,6 +894,8 @@ dm9000_init_dm9000(struct net_device *dev)
dm9000_dbg(db, 1, "entering %s\n", __func__);
dm9000_reset(db);
/* I/O mode */
db->io_mode = ior(db, DM9000_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */
@ -962,7 +964,6 @@ static void dm9000_timeout(struct net_device *dev)
reg_save = readb(db->io_addr);
netif_stop_queue(dev);
dm9000_reset(db);
dm9000_init_dm9000(dev);
/* We can accept TX packets again */
dev->trans_start = jiffies; /* prevent tx timeout */
@ -1304,7 +1305,6 @@ dm9000_open(struct net_device *dev)
mdelay(1); /* delay needs by DM9000B */
/* Initialize DM9000 board */
dm9000_reset(db);
dm9000_init_dm9000(dev);
if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))
@ -1550,12 +1550,7 @@ dm9000_probe(struct platform_device *pdev)
db->flags |= DM9000_PLATF_SIMPLE_PHY;
#endif
/* Fixing bug on dm9000_probe, takeover dm9000_reset(db),
* Need 'NCR_MAC_LBK' bit to indeed stable our DM9000 fifo
* while probe stage.
*/
iow(db, DM9000_NCR, NCR_MAC_LBK | NCR_RST);
dm9000_reset(db);
/* try multiple times, DM9000 sometimes gets the read wrong */
for (i = 0; i < 8; i++) {
@ -1698,7 +1693,6 @@ dm9000_drv_resume(struct device *dev)
/* reset if we were not in wake mode to ensure if
* the device was powered off it is in a known state */
if (!db->wake_state) {
dm9000_reset(db);
dm9000_init_dm9000(ndev);
}