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pch_uart: Support modem status interrupt

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Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomoya MORINAGA 2012-03-26 14:43:03 +09:00 committed by Greg Kroah-Hartman
parent b23954a3f7
commit 5181fb3d51
1 changed files with 13 additions and 2 deletions
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15
drivers/tty/serial/pch_uart.c
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@ -1043,10 +1043,15 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
int ret = 0;
unsigned char iid;
unsigned long flags;
int next = 1;
u8 msr;
spin_lock_irqsave(&priv->port.lock, flags);
handled = 0;
while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
while (next) {
iid = pch_uart_hal_get_iid(priv);
if (iid & PCH_UART_IIR_IP) /* No Interrupt */
break;
switch (iid) {
case PCH_UART_IID_RLS: /* Receiver Line Status */
lsr = pch_uart_hal_get_line_status(priv);
@ -1080,12 +1085,18 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
ret = handle_tx(priv);
break;
case PCH_UART_IID_MS: /* Modem Status */
ret = PCH_UART_HANDLED_MS_INT;
msr = pch_uart_hal_get_modem(priv);
next = 0; /* MS ir prioirty is the lowest. So, MS ir
means final interrupt */
if ((msr & UART_MSR_ANY_DELTA) == 0)
break;
ret |= PCH_UART_HANDLED_MS_INT;
break;
default: /* Never junp to this label */
dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
iid, jiffies);
ret = -1;
next = 0;
break;
}
handled |= (unsigned int)ret;