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.
34 #include <asm/immap.h>
37 DECLARE_GLOBAL_DATA_PTR;
39 extern void uart_port_conf(void);
43 volatile uart_t *uart;
46 uart = (volatile uart_t *)(CFG_UART_BASE);
50 /* write to SICR: SIM2 = uart mode,dcd does not affect rx */
51 uart->ucr = UART_UCR_RESET_RX;
52 uart->ucr = UART_UCR_RESET_TX;
53 uart->ucr = UART_UCR_RESET_ERROR;
54 uart->ucr = UART_UCR_RESET_MR;
59 /* write to CSR: RX/TX baud rate from timers */
60 uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);
62 uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
63 uart->umr = UART_UMR_SB_STOP_BITS_1;
65 /* Setting up BaudRate */
66 counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2));
67 counter = counter / gd->baudrate;
69 /* write to CTUR: divide counter upper byte */
70 uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
71 /* write to CTLR: divide counter lower byte */
72 uart->ubg2 = (u8) (counter & 0x00ff);
74 uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);
79 void serial_putc(const char c)
81 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
86 /* Wait for last character to go. */
87 while (!(uart->usr & UART_USR_TXRDY)) ;
92 void serial_puts(const char *s)
101 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
103 /* Wait for a character to arrive. */
104 while (!(uart->usr & UART_USR_RXRDY)) ;
108 int serial_tstc(void)
110 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
112 return (uart->usr & UART_USR_RXRDY);
115 void serial_setbrg(void)
117 volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
120 counter = ((gd->bus_clk / gd->baudrate)) >> 5;
123 /* write to CTUR: divide counter upper byte */
124 uart->ubg1 = ((counter & 0xff00) >> 8);
125 /* write to CTLR: divide counter lower byte */
126 uart->ubg2 = (counter & 0x00ff);
128 uart->ucr = UART_UCR_RESET_RX;
129 uart->ucr = UART_UCR_RESET_TX;
131 uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
133 #endif /* CONFIG_MCFUART */