Kyösti Mälkki (kyosti.malkki@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5289
-gerrit
commit 6e5c169c4219ea81945ea5d0192dab5524a98f8c Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Wed Feb 19 08:58:12 2014 +0200
allwinner/a10: Fix baudrate calculation
UART input clock is platform dependent. Also account for possible use of get_option() where baudrate is not compile-time constant.
Change-Id: Ie1c8789ef72430e43fc33bfa9ffb9f5346762439 Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/cpu/allwinner/a10/uart.c | 4 ++-- src/cpu/allwinner/a10/uart_console.c | 22 ++++++---------------- 2 files changed, 8 insertions(+), 18 deletions(-)
diff --git a/src/cpu/allwinner/a10/uart.c b/src/cpu/allwinner/a10/uart.c index 97ac302..5486ac8 100644 --- a/src/cpu/allwinner/a10/uart.c +++ b/src/cpu/allwinner/a10/uart.c @@ -19,11 +19,11 @@ void a10_uart_configure(void *uart_base, u32 baud_rate, u8 data_bits, u16 div; struct a10_uart *uart = uart_base;
+ div = (u16) uart_baudrate_divisor(baud_rate, + uart_platform_refclk(), 16); /* Enable access to Divisor Latch register */ write32(UART_LCR_DLAB, &uart->lcr); /* Set baudrate */ - /* FIXME: We assume clock is 24MHz, which may not be the case */ - div = 24000000 / 16 / baud_rate; write32((div >> 8) & 0xff, &uart->dlh); write32(div & 0xff, &uart->dll); /* Set line control */ diff --git a/src/cpu/allwinner/a10/uart_console.c b/src/cpu/allwinner/a10/uart_console.c index 58930dd..f7bd3c6 100644 --- a/src/cpu/allwinner/a10/uart_console.c +++ b/src/cpu/allwinner/a10/uart_console.c @@ -38,29 +38,19 @@ static void *get_console_uart_base_addr(void) return (void *)A1X_UART0_BASE; }
-static u32 get_console_uart_baud(void) +/* FIXME: We assume clock is 24MHz, which may not be the case. */ +unsigned int uart_platform_refclk(void) { - if (CONFIG_CONSOLE_SERIAL_115200) - return 115200; - else if (CONFIG_CONSOLE_SERIAL_57600) - return 57600; - else if (CONFIG_CONSOLE_SERIAL_38400) - return 34800; - else if (CONFIG_CONSOLE_SERIAL_19200) - return 19200; - else if (CONFIG_CONSOLE_SERIAL_9600) - return 9600; - - /* Default to 115200 if selection is invalid */ - return 115200; + return 24000000; }
static void a10_uart_init_dev(void) { void *uart_base = get_console_uart_base_addr(); + /* Use default 8N1 encoding */ - a10_uart_configure(uart_base, get_console_uart_baud(), - 8, UART_PARITY_NONE, 1); + a10_uart_configure(uart_base, default_baudrate(), + 8, UART_PARITY_NONE, 1); a10_uart_enable_fifos(uart_base); }