[7/7] Serial: OMAP2+: Make the RX_TIMEOUT for DMA configurable for each UART

Commit Message

Govindraj.R Feb. 28, 2011, 2:39 p.m. UTC

None

Patch

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 530e9e3..ff52442 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -48,6 +48,7 @@  static struct omap_uart_port_info omap_serial_default_info[] = {
 	{
 		.dma_enabled	= 0,
 		.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
+		.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
 		.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
 		.idle_timeout	= DEFAULT_IDLE_TIMEOUT,
 	},
@@ -268,6 +269,7 @@  void __init omap_serial_init_port(struct omap_board_data *bdata,
 	pdata->flags = UPF_BOOT_AUTOCONF;
 	pdata->dma_enabled = info->dma_enabled;
 	pdata->dma_rx_buf_size = info->dma_rx_buf_size;
+	pdata->dma_rx_poll_rate = info->dma_rx_poll_rate;
 	pdata->dma_rx_timeout = info->dma_rx_timeout;
 	pdata->idle_timeout = info->idle_timeout;
 	if (bdata->id == omap_uart_con_id)
diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
index 4f12d6c..e338f4e 100644
--- a/arch/arm/plat-omap/include/plat/omap-serial.h
+++ b/arch/arm/plat-omap/include/plat/omap-serial.h
@@ -51,8 +51,8 @@ 
 
 #define OMAP_UART_DMA_CH_FREE	-1
 
-#define RX_TIMEOUT		(3 * HZ)	/* RX DMA timeout (jiffies) */
-#define DEFAULT_RXDMA_TIMEOUT	1		/* RX DMA polling rate (us) */
+#define DEFAULT_RXDMA_TIMEOUT	(3 * HZ)	/* RX DMA timeout (jiffies) */
+#define DEFAULT_RXDMA_POLLRATE	1		/* RX DMA polling rate (us) */
 #define DEFAULT_RXDMA_BUFSIZE	4096		/* RX DMA buffer size */
 #define DEFAULT_IDLE_TIMEOUT	(5 * HZ)	/* UART idle timeout (secs) */
 
@@ -70,6 +70,7 @@  struct omap_uart_port_info {
 	unsigned int		console_uart;
 	unsigned int		dma_rx_buf_size;/* DMA Rx Buffer Size */
 	unsigned int		dma_rx_timeout;	/* DMA RX timeout */
+	unsigned int		dma_rx_poll_rate;	/* DMA RX timeout */
 	unsigned int		idle_timeout;	/* OMAP UART idle timeout */
 
 	void __iomem *wk_st;
@@ -99,6 +100,7 @@  struct uart_omap_dma {
 	/* timer to poll activity on rx dma */
 	struct timer_list	rx_timer;
 	unsigned int		rx_buf_size;
+	unsigned int		rx_poll_rate;
 	unsigned int		rx_timeout;
 };
 
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 008645c..5c3d2fc 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -51,7 +51,7 @@  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 omap_uart_mdr1_errataset(struct uart_omap_port *up);
 
@@ -589,7 +589,7 @@  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,
@@ -1191,7 +1191,7 @@  static int serial_omap_resume(struct device *dev)
 	return 0;
 }
 
-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;
@@ -1201,9 +1201,9 @@  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);
@@ -1232,7 +1232,7 @@  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;
 }
@@ -1270,7 +1270,7 @@  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;
 }
@@ -1412,6 +1412,7 @@  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;