X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fserial%2Fatmel_serial.c;h=c065a704a93ab68cfe167d73f67edbb700a8420c;hb=dd18434ff0b7d9b9ad3d596985fc84b329d2f9a8;hp=d57bf3e708d8fffb187dcbe33e410811cdeb1f66;hpb=1ca721cdb748ba72c47e9c661d54696db3cde796;p=linux-2.6

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index d57bf3e708..c065a704a9 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -106,6 +106,7 @@
 
 #define UART_PUT_TPR(port,v)	__raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
 #define UART_PUT_TCR(port,v)	__raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
+#define UART_GET_TCR(port)	__raw_readl((port)->membase + ATMEL_PDC_TCR)
 
 static int (*atmel_open_hook)(struct uart_port *);
 static void (*atmel_close_hook)(struct uart_port *);
@@ -562,17 +563,22 @@ static void atmel_tx_dma(struct uart_port *port)
 	struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
 	int count;
 
+	/* nothing left to transmit? */
+	if (UART_GET_TCR(port))
+		return;
+
 	xmit->tail += pdc->ofs;
 	xmit->tail &= UART_XMIT_SIZE - 1;
 
 	port->icount.tx += pdc->ofs;
 	pdc->ofs = 0;
 
-	if (!uart_circ_empty(xmit)) {
-		/* more to transmit - setup next transfer */
+	/* more to transmit - setup next transfer */
 
-		/* disable PDC transmit */
-		UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+	/* disable PDC transmit */
+	UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+
+	if (!uart_circ_empty(xmit)) {
 		dma_sync_single_for_device(port->dev,
 					   pdc->dma_addr,
 					   pdc->dma_size,
@@ -586,11 +592,6 @@ static void atmel_tx_dma(struct uart_port *port)
 		/* re-enable PDC transmit and interrupts */
 		UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
 		UART_PUT_IER(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
-	} else {
-		/* nothing left to transmit - disable the transmitter */
-
-		/* disable PDC transmit */
-		UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
 	}
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -1274,6 +1275,7 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
 {
 	struct uart_port *port = &atmel_ports[co->index].uart;
 	unsigned int status, imr;
+	unsigned int pdc_tx;
 
 	/*
 	 * First, save IMR and then disable interrupts
@@ -1281,6 +1283,10 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
 	imr = UART_GET_IMR(port);
 	UART_PUT_IDR(port, ATMEL_US_RXRDY | ATMEL_US_TXRDY);
 
+	/* Store PDC transmit status and disable it */
+	pdc_tx = UART_GET_PTSR(port) & ATMEL_PDC_TXTEN;
+	UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+
 	uart_console_write(port, s, count, atmel_console_putchar);
 
 	/*
@@ -1290,6 +1296,11 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
 	do {
 		status = UART_GET_CSR(port);
 	} while (!(status & ATMEL_US_TXRDY));
+
+	/* Restore PDC transmit status */
+	if (pdc_tx)
+		UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
+
 	/* set interrupts back the way they were */
 	UART_PUT_IER(port, imr);
 }
@@ -1565,3 +1576,4 @@ module_exit(atmel_serial_exit);
 MODULE_AUTHOR("Rick Bronson");
 MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_usart");