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authorAkshay Saraswat <akshay.s@samsung.com>2013-03-21 20:33:04 +0000
committerMinkyu Kang <mk7.kang@samsung.com>2013-05-21 20:20:30 +0900
commitffbff1dd6e6a25cc7db60576ad64e7bd570fa643 (patch)
treef37f7d24c143c744522a3980eb3b39103f539991
parent234370cab4b2f096e095fe8f3284fd39740a4023 (diff)
downloadu-boot-ffbff1dd6e6a25cc7db60576ad64e7bd570fa643.tar.gz
Exynos: uart: s5p: enabling the uart tx/rx fifo
This patch enables the uart tx/rx fifo. Now that fifo is enabled, the uart read/write functions are modfied to check the UFSTAT register for fifo status instead of UTRSTAT (as required with fifo's enabled). Tested by booting linux kernel. Before enabling tx/rx fifo "Uncompressing linux" message is garbled and after enabling it is proper. Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
-rw-r--r--drivers/serial/serial_s5p.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 3c41242a8e..e65125ccd7 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -30,6 +30,10 @@
DECLARE_GLOBAL_DATA_PTR;
+#define RX_FIFO_COUNT_MASK 0xff
+#define RX_FIFO_FULL_MASK (1 << 8)
+#define TX_FIFO_FULL_MASK (1 << 24)
+
static inline struct s5p_uart *s5p_get_base_uart(int dev_index)
{
u32 offset = dev_index * sizeof(struct s5p_uart);
@@ -87,8 +91,8 @@ int serial_init_dev(const int dev_index)
{
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
- /* reset and enable FIFOs, set triggers to the maximum */
- writel(0, &uart->ufcon);
+ /* enable FIFOs */
+ writel(0x1, &uart->ufcon);
writel(0, &uart->umcon);
/* 8N1 */
writel(0x3, &uart->ulcon);
@@ -130,7 +134,8 @@ int serial_getc_dev(const int dev_index)
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
/* wait for character to arrive */
- while (!(readl(&uart->utrstat) & 0x1)) {
+ while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
+ RX_FIFO_FULL_MASK))) {
if (serial_err_check(dev_index, 0))
return 0;
}
@@ -146,7 +151,7 @@ void serial_putc_dev(const char c, const int dev_index)
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
/* wait for room in the tx FIFO */
- while (!(readl(&uart->utrstat) & 0x2)) {
+ while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
if (serial_err_check(dev_index, 1))
return;
}