diff options
Diffstat (limited to 'drivers/serial/mcfserial.c')
| -rw-r--r-- | drivers/serial/mcfserial.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c new file mode 100644 index 0000000..a8ca78a --- /dev/null +++ b/drivers/serial/mcfserial.c @@ -0,0 +1,126 @@ +/* + * (C) Copyright 2004, Freescale, Inc + * TsiChung Liew, Tsi-Chung.Liew@freescale.com. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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 + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + +/* + * Minimal serial functions needed to use one of the uart ports + * as serial console interface. + */ + +#include <common.h> +#include <asm/mcfuart.h> + +DECLARE_GLOBAL_DATA_PTR; + +#ifdef CONFIG_MCFSERIAL +int serial_init(void) +{ + volatile uart_t *uart; + u32 counter; + + uart = (volatile uart_t *)(CFG_UART_BASE); + + /* write to SICR: SIM2 = uart mode,dcd does not affect rx */ + uart->ucr = UART_UCR_RESET_RX; + uart->ucr = UART_UCR_RESET_TX; + uart->ucr = UART_UCR_RESET_ERROR; + uart->ucr = UART_UCR_RESET_MR; + __asm__("nop"); + + uart->uimr = 0; + + /* write to CSR: RX/TX baud rate from timers */ + uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK); + + uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE); + uart->umr = UART_UMR_SB_STOP_BITS_1; + + /* Setting up BaudRate */ + counter = (u32) (gd->bus_clk / (gd->baudrate)); + counter >>= 5; + + /* write to CTUR: divide counter upper byte */ + uart->ubg1 = (u8) ((counter & 0xff00) >> 8); + /* write to CTLR: divide counter lower byte */ + uart->ubg2 = (u8) (counter & 0x00ff); + + uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED); + + return (0); +} + +void serial_putc(const char c) +{ + volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); + + if (c == '\n') + serial_putc('\r'); + + /* Wait for last character to go. */ + while (!(uart->usr & UART_USR_TXRDY)) ; + + uart->utb = c; +} + +void serial_puts(const char *s) +{ + while (*s) { + serial_putc(*s++); + } +} + +int serial_getc(void) +{ + volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); + + /* Wait for a character to arrive. */ + while (!(uart->usr & UART_USR_RXRDY)) ; + return uart->urb; +} + +int serial_tstc(void) +{ + volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); + + return (uart->usr & UART_USR_RXRDY); +} + +void serial_setbrg(void) +{ + volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); + u32 counter; + + counter = ((gd->bus_clk / gd->baudrate)) >> 5; + counter++; + + /* write to CTUR: divide counter upper byte */ + uart->ubg1 = ((counter & 0xff00) >> 8); + /* write to CTLR: divide counter lower byte */ + uart->ubg2 = (counter & 0x00ff); + + uart->ucr = UART_UCR_RESET_RX; + uart->ucr = UART_UCR_RESET_TX; + + uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED; +} +#endif /* CONFIG_MCFSERIAL */ |