3 * BRIEF MODULE DESCRIPTION
4 * Low level uart routines to directly access a 16550 uart.
6 * Copyright 2000,2001 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * ppopov@mvista.com or source@mvista.com
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
18 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
21 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <linux/types.h>
33 #define SERIAL_BASE 0xB4011800 /* it8172 */
38 #define TIMEOUT 0xffff
41 static const char digits[16] = "0123456789abcdef";
42 static volatile unsigned char *const com1 = (unsigned char *) SERIAL_BASE;
46 static inline void slow_down()
49 for (k = 0; k < 10000; k++);
55 void putch(const unsigned char c)
67 } while (0 == (ch & TX_BUSY));
71 void puts(unsigned char *cp)
84 } while (0 == (ch & TX_BUSY));
85 com1[SER_DATA] = *cp++;
91 void fputs(unsigned char *cp)
105 } while (0 == (ch & TX_BUSY));
106 com1[SER_DATA] = *cp++;
111 void put64(uint64_t ul)
116 cnt = 16; /* 16 nibbles in a 64 bit long */
121 ch = (unsigned char) (ul >> cnt * 4) & 0x0F;
126 void put32(unsigned u)
131 cnt = 8; /* 8 nibbles in a 32 bit long */
136 ch = (unsigned char) (u >> cnt * 4) & 0x0F;