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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/mcfuart.c
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.
32 #include <asm/immap.h>
35 DECLARE_GLOBAL_DATA_PTR
;
37 extern void uart_port_conf(void);
41 volatile uart_t
*uart
;
44 uart
= (volatile uart_t
*)(CONFIG_SYS_UART_BASE
);
48 /* write to SICR: SIM2 = uart mode,dcd does not affect rx */
49 uart
->ucr
= UART_UCR_RESET_RX
;
50 uart
->ucr
= UART_UCR_RESET_TX
;
51 uart
->ucr
= UART_UCR_RESET_ERROR
;
52 uart
->ucr
= UART_UCR_RESET_MR
;
57 /* write to CSR: RX/TX baud rate from timers */
58 uart
->ucsr
= (UART_UCSR_RCS_SYS_CLK
| UART_UCSR_TCS_SYS_CLK
);
60 uart
->umr
= (UART_UMR_BC_8
| UART_UMR_PM_NONE
);
61 uart
->umr
= UART_UMR_SB_STOP_BITS_1
;
63 /* Setting up BaudRate */
64 counter
= (u32
) ((gd
->bus_clk
/ 32) + (gd
->baudrate
/ 2));
65 counter
= counter
/ gd
->baudrate
;
67 /* write to CTUR: divide counter upper byte */
68 uart
->ubg1
= (u8
) ((counter
& 0xff00) >> 8);
69 /* write to CTLR: divide counter lower byte */
70 uart
->ubg2
= (u8
) (counter
& 0x00ff);
72 uart
->ucr
= (UART_UCR_RX_ENABLED
| UART_UCR_TX_ENABLED
);
77 void serial_putc(const char c
)
79 volatile uart_t
*uart
= (volatile uart_t
*)(CONFIG_SYS_UART_BASE
);
84 /* Wait for last character to go. */
85 while (!(uart
->usr
& UART_USR_TXRDY
)) ;
90 void serial_puts(const char *s
)
99 volatile uart_t
*uart
= (volatile uart_t
*)(CONFIG_SYS_UART_BASE
);
101 /* Wait for a character to arrive. */
102 while (!(uart
->usr
& UART_USR_RXRDY
)) ;
106 int serial_tstc(void)
108 volatile uart_t
*uart
= (volatile uart_t
*)(CONFIG_SYS_UART_BASE
);
110 return (uart
->usr
& UART_USR_RXRDY
);
113 void serial_setbrg(void)
115 volatile uart_t
*uart
= (volatile uart_t
*)(CONFIG_SYS_UART_BASE
);
118 /* Setting up BaudRate */
119 counter
= (u32
) ((gd
->bus_clk
/ 32) + (gd
->baudrate
/ 2));
120 counter
= counter
/ gd
->baudrate
;
122 /* write to CTUR: divide counter upper byte */
123 uart
->ubg1
= ((counter
& 0xff00) >> 8);
124 /* write to CTLR: divide counter lower byte */
125 uart
->ubg2
= (counter
& 0x00ff);
127 uart
->ucr
= UART_UCR_RESET_RX
;
128 uart
->ucr
= UART_UCR_RESET_TX
;
130 uart
->ucr
= UART_UCR_RX_ENABLED
| UART_UCR_TX_ENABLED
;