diff options
| author | Joseph Chen <chenjh@rock-chips.com> | 2017-07-06 15:29:24 +0800 |
|---|---|---|
| committer | Jérôme Forissier <jerome.forissier@linaro.org> | 2017-07-25 14:46:40 +0200 |
| commit | 65d34b1fc22a1fb769639cb933f1339592c91d8f (patch) | |
| tree | a62616c81d585b8ddca421a9f6e5a58c38591f61 /core/drivers/serial8250_uart.c | |
| parent | 6dc18b3025fbd9d5d36fd0fefcbbeb3cb5fa3ac4 (diff) | |
drivers: serial8250_uart: use 32-bit accesses to the uart registers
Due to hardware design, some platforms can't access the peripheral IO
registers once a byte(8-bit) but once a word(32-bit). Obviously, using
32-bit accesses to the registers is more flexible for other plaforms
to use serial8250 uart.
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Igor Opaniuk <igor.opaniuk@linaro.org> (serial8250_uart, TI-AM57xx)
Diffstat (limited to 'core/drivers/serial8250_uart.c')
| -rw-r--r-- | core/drivers/serial8250_uart.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/core/drivers/serial8250_uart.c b/core/drivers/serial8250_uart.c index 5e861581..f8054abb 100644 --- a/core/drivers/serial8250_uart.c +++ b/core/drivers/serial8250_uart.c @@ -63,7 +63,7 @@ static void serial8250_uart_flush(struct serial_chip *chip) vaddr_t base = chip_to_base(chip); while (1) { - uint8_t state = read8(base + UART_LSR); + uint32_t state = read32(base + UART_LSR); /* Wait until transmit FIFO is empty */ if ((state & LSR_EMPTY) == LSR_EMPTY) @@ -86,7 +86,7 @@ static int serial8250_uart_getchar(struct serial_chip *chip) /* Transmit FIFO is empty, waiting again */ ; } - return read8(base + UART_RHR); + return read32(base + UART_RHR) & 0xff; } static void serial8250_uart_putc(struct serial_chip *chip, int ch) @@ -96,7 +96,7 @@ static void serial8250_uart_putc(struct serial_chip *chip, int ch) serial8250_uart_flush(chip); /* Write out character to transmit FIFO */ - write8(ch, base + UART_THR); + write32(ch, base + UART_THR); } static const struct serial_ops serial8250_uart_ops = { |