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snow: Add flush to UART driver. 

Wait for UART FIFO to be ready.
(Credit to dhendrix for finding the bits to test with.)

Change-Id: Ib6733e422cbc1c61b942bd90d85f88a3f412d6ff
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3698
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Hung-Te Lin 2013-06-05 14:06:55 -07:00 committed by Stefan Reinauer
parent ce7a5a790b
commit 7dd581494d
1 changed files with 9 additions and 1 deletions
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10
src/cpu/samsung/exynos5250/uart.c
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@ -162,12 +162,19 @@ static void exynos5_uart_tx_byte(unsigned char data)
writeb(data, &uart->utxh); writeb(data, &uart->utxh);
} }
static void exynos5_uart_tx_flush(void)
{
struct s5p_uart *uart = (struct s5p_uart *)base_port;
while (readl(&uart->ufstat) & 0x1ff0000);
}
#if !defined(__PRE_RAM__) #if !defined(__PRE_RAM__)
static const struct console_driver exynos5_uart_console __console = { static const struct console_driver exynos5_uart_console __console = {
.init = exynos5_init_dev, .init = exynos5_init_dev,
.tx_byte = exynos5_uart_tx_byte, .tx_byte = exynos5_uart_tx_byte,
// .tx_flush = exynos5_uart_tx_flush, .tx_flush = exynos5_uart_tx_flush,
.rx_byte = exynos5_uart_rx_byte, .rx_byte = exynos5_uart_rx_byte,
// .tst_byte = exynos5_uart_tst_byte, // .tst_byte = exynos5_uart_tst_byte,
}; };
@ -196,6 +203,7 @@ void uart_tx_byte(unsigned char data)
void uart_tx_flush(void) void uart_tx_flush(void)
{ {
exynos5_uart_tx_flush();
} }
#endif #endif