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authorStefan Agner <stefan@agner.ch>2014-08-19 17:54:28 +0200
committerStefano Babic <sbabic@denx.de>2014-09-09 16:54:16 +0200
commit89e69fd4a96bcab2469d3d084ba335c6b925771a (patch)
treee113dbf2c25453e6dd7fb3ded88813d40ff92277
parenta3db78d8870c8fb5bc0b1acd73bdc998d0d34200 (diff)
arm: vf610: lpuart: disable FIFO on initializaton
UART does not use the UART FIFO, but we should also not rely that the UART FIFO is diabled by default. For instance, when loading U-Boot using the boot ROMs serial downloader protocol over UART, FIFO is enabled at U-Boot start time. This patch disables the RX and TX FIFO, sets back their thresholds and flushes them. Signed-off-by: Stefan Agner <stefan@agner.ch>
-rw-r--r--drivers/serial/serial_lpuart.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 96173ca440..0a5e15919f 100644
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -17,6 +17,10 @@
#define US1_OR (1 << 3)
#define UC2_TE (1 << 3)
#define UC2_RE (1 << 2)
+#define CFIFO_TXFLUSH (1 << 7)
+#define CFIFO_RXFLUSH (1 << 6)
+#define SFIFO_RXOF (1 << 2)
+#define SFIFO_RXUF (1 << 0)
DECLARE_GLOBAL_DATA_PTR;
@@ -85,6 +89,12 @@ static int lpuart_serial_init(void)
__raw_writeb(0, &base->umodem);
__raw_writeb(0, &base->uc1);
+ /* Disable FIFO and flush buffer */
+ __raw_writeb(0x0, &base->upfifo);
+ __raw_writeb(0x0, &base->utwfifo);
+ __raw_writeb(0x1, &base->urwfifo);
+ __raw_writeb(CFIFO_TXFLUSH | CFIFO_RXFLUSH, &base->ucfifo);
+
/* provide data bits, parity, stop bit, etc */
serial_setbrg();