2 * (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
3 * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * Minimal serial functions needed to use one of the uart ports
27 * as serial console interface.
31 #include <asm/immap.h>
34 DECLARE_GLOBAL_DATA_PTR;
39 volatile uart_t *uart;
42 uart = (volatile uart_t *)(CFG_UART_BASE);
44 /* write to SICR: SIM2 = uart mode,dcd does not affect rx */
45 uart->ucr = UART_UCR_RESET_RX;
46 uart->ucr = UART_UCR_RESET_TX;
47 uart->ucr = UART_UCR_RESET_ERROR;
48 uart->ucr = UART_UCR_RESET_MR;
53 /* write to CSR: RX/TX baud rate from timers */
54 uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);
56 uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
57 uart->umr = UART_UMR_SB_STOP_BITS_1;
59 /* Setting up BaudRate */
60 counter = (u32) (gd->bus_clk / (gd->baudrate));
63 /* write to CTUR: divide counter upper byte */
64 uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
65 /* write to CTLR: divide counter lower byte */
66 uart->ubg2 = (u8) (counter & 0x00ff);
68 uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);
73 void serial_putc(const char c)
75 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
80 /* Wait for last character to go. */
81 while (!(uart->usr & UART_USR_TXRDY)) ;
86 void serial_puts(const char *s)
95 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
97 /* Wait for a character to arrive. */
98 while (!(uart->usr & UART_USR_RXRDY)) ;
102 int serial_tstc(void)
104 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
106 return (uart->usr & UART_USR_RXRDY);
109 void serial_setbrg(void)
111 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
114 counter = ((gd->bus_clk / gd->baudrate)) >> 5;
117 /* write to CTUR: divide counter upper byte */
118 uart->ubg1 = ((counter & 0xff00) >> 8);
119 /* write to CTLR: divide counter lower byte */
120 uart->ubg2 = (counter & 0x00ff);
122 uart->ucr = UART_UCR_RESET_RX;
123 uart->ucr = UART_UCR_RESET_TX;
125 uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
127 #endif /* CONFIG_MCFUART */