140 lines
3 KiB
C
140 lines
3 KiB
C
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/*
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*
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* BRIEF MODULE DESCRIPTION
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* Low level uart routines to directly access a 16550 uart.
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*
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* Copyright 2000,2001 MontaVista Software Inc.
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* Author: MontaVista Software, Inc.
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* ppopov@mvista.com or source@mvista.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/types.h>
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#define SERIAL_BASE 0xB4011800 /* it8172 */
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#define SER_CMD 5
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#define SER_DATA 0x00
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#define TX_BUSY 0x20
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#define TIMEOUT 0xffff
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#undef SLOW_DOWN
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static const char digits[16] = "0123456789abcdef";
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static volatile unsigned char *const com1 = (unsigned char *) SERIAL_BASE;
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#ifdef SLOW_DOWN
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static inline void slow_down()
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{
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int k;
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for (k = 0; k < 10000; k++);
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}
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#else
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#define slow_down()
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#endif
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void putch(const unsigned char c)
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{
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unsigned char ch;
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int i = 0;
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do {
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ch = com1[SER_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SER_DATA] = c;
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}
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void puts(unsigned char *cp)
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{
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unsigned char ch;
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int i = 0;
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while (*cp) {
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do {
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ch = com1[SER_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SER_DATA] = *cp++;
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}
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putch('\r');
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putch('\n');
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}
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void fputs(unsigned char *cp)
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{
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unsigned char ch;
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int i = 0;
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while (*cp) {
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do {
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ch = com1[SER_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SER_DATA] = *cp++;
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}
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}
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void put64(uint64_t ul)
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{
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int cnt;
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unsigned ch;
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cnt = 16; /* 16 nibbles in a 64 bit long */
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putch('0');
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putch('x');
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do {
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cnt--;
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ch = (unsigned char) (ul >> cnt * 4) & 0x0F;
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putch(digits[ch]);
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} while (cnt > 0);
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}
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void put32(unsigned u)
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{
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int cnt;
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unsigned ch;
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cnt = 8; /* 8 nibbles in a 32 bit long */
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putch('0');
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putch('x');
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do {
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cnt--;
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ch = (unsigned char) (u >> cnt * 4) & 0x0F;
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putch(digits[ch]);
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} while (cnt > 0);
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}
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