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authorSamuel Iglesias Gonsalvez <siglesias@igalia.com>2012-12-10 11:50:07 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-15 18:24:39 -0800
commitb0d17fbdacb32f9f4b9ee1ad2b8f42f6a480d842 (patch)
tree35f703a72c975bee4f79d4505ec3667e18ca346b /drivers/ipack
parentb06073f963b7b00a628e58e87d02028e2c9e430d (diff)
downloadlinux-b0d17fbdacb32f9f4b9ee1ad2b8f42f6a480d842.tar.gz
ipack/devices/ipoctal: add rx_enable flag
Thus, we don't enable RX when a termios setup has been called, as it could be disabled previously. As the control registers (Rx, Tx flags specifically) cannot be read from the device, we keep this info in rx_enable. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/ipack')
-rw-r--r--drivers/ipack/devices/ipoctal.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 34fcfce0cdd..8666d2d05ee 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -43,6 +43,7 @@ struct ipoctal_channel {
unsigned int board_id;
u8 isr_rx_rdy_mask;
u8 isr_tx_rdy_mask;
+ unsigned int rx_enable;
};
struct ipoctal {
@@ -65,6 +66,7 @@ static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
* there is something to send
*/
iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+ channel->rx_enable = 1;
return 0;
}
@@ -309,6 +311,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
}
iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
@@ -430,6 +433,7 @@ static int ipoctal_write_tty(struct tty_struct *tty,
/* As the IP-OCTAL 485 only supports half duplex, do it manually */
if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
}
@@ -589,8 +593,9 @@ static void ipoctal_set_termios(struct tty_struct *tty,
iowrite8(mr2, &channel->regs->w.mr);
iowrite8(csr, &channel->regs->w.csr);
- /* Enable again the RX */
- iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+ /* Enable again the RX, if it was before */
+ if (channel->rx_enable)
+ iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
}
static void ipoctal_hangup(struct tty_struct *tty)
@@ -610,6 +615,7 @@ static void ipoctal_hangup(struct tty_struct *tty)
tty_port_hangup(&channel->tty_port);
iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);