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authorJon Hunter <jon-hunter@ti.com>2011-11-09 17:34:49 +0530
committerKevin Hilman <khilman@ti.com>2011-12-14 16:05:24 -0800
commita9e210e0b7a344c0e44aa6bf6888176bbc635c42 (patch)
treee24466ff2fd9c2f10979d5fce32a870c451448ff /drivers/tty
parentc86845db77ce220f77e6645b18800744684946ac (diff)
downloadop-kernel-dev-a9e210e0b7a344c0e44aa6bf6888176bbc635c42.zip
op-kernel-dev-a9e210e0b7a344c0e44aa6bf6888176bbc635c42.tar.gz
ARM: OMAP2+: UART: Make the RX_TIMEOUT for DMA configurable for each UART
When using DMA there are two timeouts defined. The first timeout, rx_timeout, is really a polling rate in which software polls the DMA status to see if the DMA has finished. This is necessary for the RX side because we do not know how much data we will receive. The secound timeout, RX_TIMEOUT, is a timeout after which the DMA will be stopped if no more data is received. To make this clearer, rename rx_timeout as rx_poll_rate and rename the function serial_omap_rx_timeout() to serial_omap_rxdma_poll(). The OMAP-Serial driver defines an RX_TIMEOUT of 3 seconds that is used to indicate when the DMA for UART can be stopped if no more data is received. The value is a global definition that is applied to all instances of the UART. Each UART may be used for a different purpose and so the timeout required may differ. Make this value configurable for each UART so that this value can be optimised for power savings. Signed-off-by: Jon Hunter <jon-hunter@ti.com> Signed-off-by: Govindraj.R <govindraj.raja@ti.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> (for drivers/tty changes) Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/omap-serial.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index d60e001..e1eaa66 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -47,7 +47,7 @@ static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
/* Forward declaration of functions */
static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
-static void serial_omap_rx_timeout(unsigned long uart_no);
+static void serial_omap_rxdma_poll(unsigned long uart_no);
static int serial_omap_start_rxdma(struct uart_omap_port *up);
static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
@@ -542,7 +542,7 @@ static int serial_omap_startup(struct uart_port *port)
(dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
0);
init_timer(&(up->uart_dma.rx_timer));
- up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
+ up->uart_dma.rx_timer.function = serial_omap_rxdma_poll;
up->uart_dma.rx_timer.data = up->pdev->id;
/* Currently the buffer size is 4KB. Can increase it */
up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
@@ -1160,7 +1160,7 @@ static int serial_omap_resume(struct device *dev)
}
#endif
-static void serial_omap_rx_timeout(unsigned long uart_no)
+static void serial_omap_rxdma_poll(unsigned long uart_no)
{
struct uart_omap_port *up = ui[uart_no];
unsigned int curr_dma_pos, curr_transmitted_size;
@@ -1170,9 +1170,9 @@ static void serial_omap_rx_timeout(unsigned long uart_no)
if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
(curr_dma_pos == 0)) {
if (jiffies_to_msecs(jiffies - up->port_activity) <
- RX_TIMEOUT) {
+ up->uart_dma.rx_timeout) {
mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_timeout));
+ usecs_to_jiffies(up->uart_dma.rx_poll_rate));
} else {
serial_omap_stop_rxdma(up);
up->ier |= (UART_IER_RDI | UART_IER_RLSI);
@@ -1201,7 +1201,7 @@ static void serial_omap_rx_timeout(unsigned long uart_no)
}
} else {
mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_timeout));
+ usecs_to_jiffies(up->uart_dma.rx_poll_rate));
}
up->port_activity = jiffies;
}
@@ -1240,7 +1240,7 @@ static int serial_omap_start_rxdma(struct uart_omap_port *up)
/* FIXME: Cache maintenance needed here? */
omap_start_dma(up->uart_dma.rx_dma_channel);
mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_timeout));
+ usecs_to_jiffies(up->uart_dma.rx_poll_rate));
up->uart_dma.rx_dma_used = true;
return ret;
}
@@ -1376,6 +1376,7 @@ static int serial_omap_probe(struct platform_device *pdev)
up->use_dma = 1;
up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size;
up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout;
+ up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate;
spin_lock_init(&(up->uart_dma.tx_lock));
spin_lock_init(&(up->uart_dma.rx_lock));
up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
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