diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/mcfuart.c | 4 | ||||
| -rw-r--r-- | drivers/serial/serial.c | 11 | ||||
| -rw-r--r-- | drivers/serial/serial_xuartlite.c | 37 |
3 files changed, 32 insertions, 20 deletions
diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c index 88f3eb1..5eb4f45 100644 --- a/drivers/serial/mcfuart.c +++ b/drivers/serial/mcfuart.c @@ -63,8 +63,8 @@ int serial_init(void) uart->umr = UART_UMR_SB_STOP_BITS_1; /* Setting up BaudRate */ - counter = (u32) (gd->bus_clk / (gd->baudrate)); - counter >>= 5; + counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2)); + counter = counter / gd->baudrate; /* write to CTUR: divide counter upper byte */ uart->ubg1 = (u8) ((counter & 0xff00) >> 8); diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c index 182ca2d..4ccaee2 100644 --- a/drivers/serial/serial.c +++ b/drivers/serial/serial.c @@ -124,6 +124,8 @@ static NS16550_t serial_ports[4] = { static int calc_divisor (NS16550_t port) { + uint32_t clk_divisor; + #ifdef CONFIG_OMAP1510 /* If can't cleanly clock 115200 set div to 1 */ if ((CFG_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) { @@ -147,10 +149,15 @@ static int calc_divisor (NS16550_t port) /* Compute divisor value. Normally, we should simply return: * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate - * but we need to round that value by adding 0.5 or 8/16. + * but we need to round that value by adding 0.5 (2/4). * Rounding is especially important at high baud rates. */ - return (((16 * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate) + 8) / 16; + clk_divisor = (((4 * CFG_NS16550_CLK) / + (MODE_X_DIV * gd->baudrate)) + 2) / 4; + + debug("NS16550 clock divisor = %d\n", clk_divisor); + + return clk_divisor; } #if !defined(CONFIG_SERIAL_MULTI) diff --git a/drivers/serial/serial_xuartlite.c b/drivers/serial/serial_xuartlite.c index d678ab6..5c41a1c 100644 --- a/drivers/serial/serial_xuartlite.c +++ b/drivers/serial/serial_xuartlite.c @@ -1,6 +1,8 @@ /* - * (C) Copyright 2004 Atmark Techno, Inc. + * (C) Copyright 2008 Michal Simek <monstr@monstr.eu> + * Clean driver and add xilinx constant from header file * + * (C) Copyright 2004 Atmark Techno, Inc. * Yasushi SHOJI <yashi@atmark-techno.com> * * See file CREDITS for list of people who contributed to this @@ -13,7 +15,7 @@ * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License @@ -23,19 +25,21 @@ */ #include <config.h> +#include <asm/io.h> #ifdef CONFIG_XILINX_UARTLITE -#include <asm/serial_xuartlite.h> +#define RX_FIFO_OFFSET 0 /* receive FIFO, read only */ +#define TX_FIFO_OFFSET 4 /* transmit FIFO, write only */ +#define STATUS_REG_OFFSET 8 /* status register, read only */ -/* FIXME: we should convert these to in32 and out32 */ -#define IO_WORD(offset) (*(volatile unsigned long *)(offset)) -#define IO_SERIAL(offset) IO_WORD(CONFIG_SERIAL_BASE + (offset)) +#define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */ +#define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */ +#define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */ -#define IO_SERIAL_RX_FIFO IO_SERIAL(XUL_RX_FIFO_OFFSET) -#define IO_SERIAL_TX_FIFO IO_SERIAL(XUL_TX_FIFO_OFFSET) -#define IO_SERIAL_STATUS IO_SERIAL(XUL_STATUS_REG_OFFSET) -#define IO_SERIAL_CONTROL IO_SERIAL(XUL_CONTROL_REG_OFFSET) +#define UARTLITE_STATUS (CONFIG_SERIAL_BASE + STATUS_REG_OFFSET) +#define UARTLITE_TX_FIFO (CONFIG_SERIAL_BASE + TX_FIFO_OFFSET) +#define UARTLITE_RX_FIFO (CONFIG_SERIAL_BASE + RX_FIFO_OFFSET) int serial_init(void) { @@ -50,9 +54,10 @@ void serial_setbrg(void) void serial_putc(const char c) { - if (c == '\n') serial_putc('\r'); - while (IO_SERIAL_STATUS & XUL_SR_TX_FIFO_FULL); - IO_SERIAL_TX_FIFO = (unsigned char) (c & 0xff); + if (c == '\n') + serial_putc('\r'); + while (in_be32(UARTLITE_STATUS) & SR_TX_FIFO_FULL); + out_be32(UARTLITE_TX_FIFO, (unsigned char) (c & 0xff)); } void serial_puts(const char * s) @@ -64,13 +69,13 @@ void serial_puts(const char * s) int serial_getc(void) { - while (!(IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA)); - return IO_SERIAL_RX_FIFO & 0xff; + while (!(in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA)); + return in_be32(UARTLITE_RX_FIFO) & 0xff; } int serial_tstc(void) { - return (IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA); + return (in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA); } #endif /* CONFIG_MICROBLZE */ |