puts.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- /*
- *
- * BRIEF MODULE DESCRIPTION
- * Low level uart routines to directly access a 16550 uart.
- *
- * Copyright 2000,2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * ppopov@mvista.com or source@mvista.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <linux/types.h>
- #define SERIAL_BASE 0xB4011800 /* it8172 */
- #define SER_CMD 5
- #define SER_DATA 0x00
- #define TX_BUSY 0x20
- #define TIMEOUT 0xffff
- #undef SLOW_DOWN
- static const char digits[16] = "0123456789abcdef";
- static volatile unsigned char *const com1 = (unsigned char *) SERIAL_BASE;
- #ifdef SLOW_DOWN
- static inline void slow_down()
- {
- int k;
- for (k = 0; k < 10000; k++);
- }
- #else
- #define slow_down()
- #endif
- void putch(const unsigned char c)
- {
- unsigned char ch;
- int i = 0;
- do {
- ch = com1[SER_CMD];
- slow_down();
- i++;
- if (i > TIMEOUT) {
- break;
- }
- } while (0 == (ch & TX_BUSY));
- com1[SER_DATA] = c;
- }
- void puts(unsigned char *cp)
- {
- unsigned char ch;
- int i = 0;
- while (*cp) {
- do {
- ch = com1[SER_CMD];
- slow_down();
- i++;
- if (i > TIMEOUT) {
- break;
- }
- } while (0 == (ch & TX_BUSY));
- com1[SER_DATA] = *cp++;
- }
- putch('r');
- putch('n');
- }
- void fputs(unsigned char *cp)
- {
- unsigned char ch;
- int i = 0;
- while (*cp) {
- do {
- ch = com1[SER_CMD];
- slow_down();
- i++;
- if (i > TIMEOUT) {
- break;
- }
- } while (0 == (ch & TX_BUSY));
- com1[SER_DATA] = *cp++;
- }
- }
- void put64(uint64_t ul)
- {
- int cnt;
- unsigned ch;
- cnt = 16; /* 16 nibbles in a 64 bit long */
- putch('0');
- putch('x');
- do {
- cnt--;
- ch = (unsigned char) (ul >> cnt * 4) & 0x0F;
- putch(digits[ch]);
- } while (cnt > 0);
- }
- void put32(unsigned u)
- {
- int cnt;
- unsigned ch;
- cnt = 8; /* 8 nibbles in a 32 bit long */
- putch('0');
- putch('x');
- do {
- cnt--;
- ch = (unsigned char) (u >> cnt * 4) & 0x0F;
- putch(digits[ch]);
- } while (cnt > 0);
- }