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authorAndrew Ruder <andrew.ruder@elecsyscorp.com>2014-06-04 17:28:46 -0500
committerDavid S. Miller <davem@davemloft.net>2014-06-05 15:12:10 -0700
commit17ad78de7f60bfc9711acb57c3c9561def6ee402 (patch)
tree2677355c2646a5b32facf7e6a5836a7e8aa53acc /drivers
parentdm9000: clean up reset code (diff)
downloadlinux-dev-17ad78de7f60bfc9711acb57c3c9561def6ee402.tar.xz
linux-dev-17ad78de7f60bfc9711acb57c3c9561def6ee402.zip
dm9000: clean up edge-triggered irq compatibility
DM9000 uses level-triggered interrupts. Some systems (PXA270) only support edge-triggered interrupts on GPIOs. Some changes are necessary to ensure that interrupts are not triggered while the GPIO interrupt is masked or we will miss the interrupt forever. * Make some helper functions called dm9000_mask_interrupts() and dm9000_unmask_interrupts() for readability. * dm9000_init_dm9000(): ensure that this function always leaves interrupts masked regardless of the state when it entered the function. This is primarily to support the situation in dm9000_open where the logic used to go: dm9000_open() dm9000_init_dm9000() unmask interrupts request_irq() If an interrupt occurred between unmasking the interrupt and requesting the irq, it would be missed forever as the edge event would never be seen by the GPIO hardware in the PXA270. This allows us to change the logic to: dm9000_open() dm9000_init_dm9000() dm9000_mask_interrupts() request_irq() dm9000_unmask_interrupts() * dm9000_timeout(), dm9000_drv_resume(): Add the missing dm9000_unmask_interrupts() now required by the change above. * dm9000_shutdown(): Use mask helper function * dm9000_interrupt(): Use mask/unmask helper functions Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/davicom/dm9000.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index a10671ecbf81..a34f9fcc3992 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -882,6 +882,18 @@ dm9000_hash_table(struct net_device *dev)
spin_unlock_irqrestore(&db->lock, flags);
}
+static void
+dm9000_mask_interrupts(board_info_t *db)
+{
+ iow(db, DM9000_IMR, IMR_PAR);
+}
+
+static void
+dm9000_unmask_interrupts(board_info_t *db)
+{
+ iow(db, DM9000_IMR, db->imr_all);
+}
+
/*
* Initialize dm9000 board
*/
@@ -895,6 +907,7 @@ dm9000_init_dm9000(struct net_device *dev)
dm9000_dbg(db, 1, "entering %s\n", __func__);
dm9000_reset(db);
+ dm9000_mask_interrupts(db);
/* I/O mode */
db->io_mode = ior(db, DM9000_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */
@@ -943,9 +956,6 @@ dm9000_init_dm9000(struct net_device *dev)
db->imr_all = imr;
- /* Enable TX/RX interrupt mask */
- iow(db, DM9000_IMR, imr);
-
/* Init Driver variable */
db->tx_pkt_cnt = 0;
db->queue_pkt_len = 0;
@@ -965,6 +975,7 @@ static void dm9000_timeout(struct net_device *dev)
netif_stop_queue(dev);
dm9000_init_dm9000(dev);
+ dm9000_unmask_interrupts(db);
/* We can accept TX packets again */
dev->trans_start = jiffies; /* prevent tx timeout */
netif_wake_queue(dev);
@@ -1194,9 +1205,7 @@ static irqreturn_t dm9000_interrupt(int irq, void *dev_id)
/* Save previous register address */
reg_save = readb(db->io_addr);
- /* Disable all interrupts */
- iow(db, DM9000_IMR, IMR_PAR);
-
+ dm9000_mask_interrupts(db);
/* Got DM9000 interrupt status */
int_status = ior(db, DM9000_ISR); /* Got ISR */
iow(db, DM9000_ISR, int_status); /* Clear ISR status */
@@ -1219,9 +1228,7 @@ static irqreturn_t dm9000_interrupt(int irq, void *dev_id)
}
}
- /* Re-enable interrupt mask */
- iow(db, DM9000_IMR, db->imr_all);
-
+ dm9000_unmask_interrupts(db);
/* Restore previous register address */
writeb(reg_save, db->io_addr);
@@ -1309,6 +1316,10 @@ dm9000_open(struct net_device *dev)
if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))
return -EAGAIN;
+ /* Now that we have an interrupt handler hooked up we can unmask
+ * our interrupts
+ */
+ dm9000_unmask_interrupts(db);
/* Init driver variable */
db->dbug_cnt = 0;
@@ -1329,7 +1340,7 @@ dm9000_shutdown(struct net_device *dev)
/* RESET device */
dm9000_phy_write(dev, 0, MII_BMCR, BMCR_RESET); /* PHY RESET */
iow(db, DM9000_GPR, 0x01); /* Power-Down PHY */
- iow(db, DM9000_IMR, IMR_PAR); /* Disable all interrupt */
+ dm9000_mask_interrupts(db);
iow(db, DM9000_RCR, 0x00); /* Disable RX */
}
@@ -1694,6 +1705,7 @@ dm9000_drv_resume(struct device *dev)
* the device was powered off it is in a known state */
if (!db->wake_state) {
dm9000_init_dm9000(ndev);
+ dm9000_unmask_interrupts(db);
}
netif_device_attach(ndev);