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git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/nios2/serial.c
2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.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,
30 /*------------------------------------------------------------------
31 * JTAG acts as the serial port
32 *-----------------------------------------------------------------*/
33 #if defined(CONFIG_CONSOLE_JTAG)
35 static nios_jtag_t
*jtag
=
36 (nios_jtag_t
*)CACHE_BYPASS(CFG_NIOS_CONSOLE
);
38 void serial_setbrg( void ){ return; }
39 int serial_init( void ) { return(0);}
41 void serial_putc (char c
)
45 while (NIOS_JTAG_WSPACE (jtag
->control
) == 0)
47 jtag
->data
= (unsigned char)c
;
50 void serial_puts (const char *s
)
56 int serial_tstc (void)
58 return (jtag
->control
& NIOS_JTAG_RRDY
);
61 int serial_getc (void)
69 if (val
& NIOS_JTAG_RVALID
)
76 /*------------------------------------------------------------------
77 * UART the serial port
78 *-----------------------------------------------------------------*/
81 static nios_uart_t
*uart
= (nios_uart_t
*)
82 CACHE_BYPASS(CFG_NIOS_CONSOLE
);
84 #if defined(CFG_NIOS_FIXEDBAUD)
86 /* Everything's already setup for fixed-baud PTF
89 void serial_setbrg (void){ return; }
90 int serial_init (void) { return (0);}
94 void serial_setbrg (void)
96 DECLARE_GLOBAL_DATA_PTR
;
99 div
= (CONFIG_SYS_CLK_FREQ
/gd
->baudrate
)-1;
104 int serial_init (void)
110 #endif /* CFG_NIOS_FIXEDBAUD */
113 /*-----------------------------------------------------------------------
115 *---------------------------------------------------------------------*/
116 void serial_putc (char c
)
120 while ((uart
->status
& NIOS_UART_TRDY
) == 0)
122 uart
->txdata
= (unsigned char)c
;
125 void serial_puts (const char *s
)
132 int serial_tstc (void)
134 return (uart
->status
& NIOS_UART_RRDY
);
137 int serial_getc (void)
139 while (serial_tstc () == 0)
141 return( uart
->rxdata
& 0x00ff );
144 #endif /* CONFIG_JTAG_CONSOLE */