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authorAlan Cox <alan@linux.intel.com>2010-09-13 15:39:56 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:20:03 -0700
commit91efa75ce14db63d1eb47a2935bc7332de243f8d (patch)
treeb51944dec371ea57d4aef64a361c7dc41a305738 /drivers/serial
parentee9b4500eb6433015f35762d390666fede48e574 (diff)
downloadlinux-91efa75ce14db63d1eb47a2935bc7332de243f8d.tar.bz2
serial: mrst_max3110: Make the IRQ option runtime
And while we are at it allow it to fail to find one. Without this the IRQ option will cause the 3110 driver to fail on 0.7 SFI firmware. Acked-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/Kconfig7
-rw-r--r--drivers/serial/mrst_max3110.c55
2 files changed, 28 insertions, 34 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 12900f7083b0..ba4b390299d5 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -717,13 +717,6 @@ config SERIAL_MRST_MAX3110
the Intel Moorestown platform. On other systems use the max3100
driver.
-config MRST_MAX3110_IRQ
- boolean "Enable GPIO IRQ for Max3110 over Moorestown"
- default n
- depends on SERIAL_MRST_MAX3110 && GPIO_LANGWELL
- help
- This has to be enabled after Moorestown GPIO driver is loaded
-
config SERIAL_MFD_HSU
tristate "Medfield High Speed UART support"
depends on PCI
diff --git a/drivers/serial/mrst_max3110.c b/drivers/serial/mrst_max3110.c
index af8db27f9e87..b62857bf2fdb 100644
--- a/drivers/serial/mrst_max3110.c
+++ b/drivers/serial/mrst_max3110.c
@@ -447,7 +447,6 @@ static int max3110_main_thread(void *_max)
return ret;
}
-#ifdef CONFIG_MRST_MAX3110_IRQ
static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
{
struct uart_max3110 *max = dev_id;
@@ -459,7 +458,7 @@ static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
-#else
+
/* if don't use RX IRQ, then need a thread to polling read */
static int max3110_read_thread(void *_max)
{
@@ -482,7 +481,6 @@ static int max3110_read_thread(void *_max)
return 0;
}
-#endif
static int serial_m3110_startup(struct uart_port *port)
{
@@ -505,34 +503,38 @@ static int serial_m3110_startup(struct uart_port *port)
/* as we use thread to handle tx/rx, need set low latency */
port->state->port.tty->low_latency = 1;
-#ifdef CONFIG_MRST_MAX3110_IRQ
- ret = request_irq(max->irq, serial_m3110_irq,
+ if (max->irq) {
+ max->read_thread = NULL;
+ ret = request_irq(max->irq, serial_m3110_irq,
IRQ_TYPE_EDGE_FALLING, "max3110", max);
- if (ret)
- return ret;
+ if (ret) {
+ max->irq = 0;
+ pr_err(PR_FMT "unable to allocate IRQ, polling\n");
+ } else {
+ /* Enable RX IRQ only */
+ config |= WC_RXA_IRQ_ENABLE;
+ }
+ }
- /* Enable RX IRQ only */
- config |= WC_RXA_IRQ_ENABLE;
-#else
- /* If IRQ is disabled, start a read thread for input data */
- max->read_thread =
- kthread_run(max3110_read_thread, max, "max3110_read");
- if (IS_ERR(max->read_thread)) {
- ret = PTR_ERR(max->read_thread);
- max->read_thread = NULL;
- pr_err(PR_FMT "Can't create read thread!");
- return ret;
+ if (max->irq == 0) {
+ /* If IRQ is disabled, start a read thread for input data */
+ max->read_thread =
+ kthread_run(max3110_read_thread, max, "max3110_read");
+ if (IS_ERR(max->read_thread)) {
+ ret = PTR_ERR(max->read_thread);
+ max->read_thread = NULL;
+ pr_err(PR_FMT "Can't create read thread!\n");
+ return ret;
+ }
}
-#endif
ret = max3110_out(max, config);
if (ret) {
-#ifdef CONFIG_MRST_MAX3110_IRQ
- free_irq(max->irq, max);
-#else
- kthread_stop(max->read_thread);
+ if (max->irq)
+ free_irq(max->irq, max);
+ if (max->read_thread)
+ kthread_stop(max->read_thread);
max->read_thread = NULL;
-#endif
return ret;
}
@@ -551,9 +553,8 @@ static void serial_m3110_shutdown(struct uart_port *port)
max->read_thread = NULL;
}
-#ifdef CONFIG_MRST_MAX3110_IRQ
- free_irq(max->irq, max);
-#endif
+ if (max->irq)
+ free_irq(max->irq, max);
/* Disable interrupts from this port */
config = WC_TAG | WC_SW_SHDI;