/* * * BRIEF MODULE DESCRIPTION * Low level uart routines to directly access a 16550 uart. * * Copyright 2001 MontaVista Software Inc. * Author: MontaVista Software, Inc. * stevel@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 #include #define SERIAL_BASE RC32300_UART0_BASE #define SER_CMD (SERIAL_BASE + 0x14) #define SER_DATA (SERIAL_BASE + 0x00) #define TX_BUSY 0x20 #define TIMEOUT 0xffff #undef SLOW_DOWN static const char digits[16] = "0123456789abcdef"; #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 = rc32300_inb(SER_CMD); slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); rc32300_outb(c, SER_DATA); } void puts(unsigned char *cp) { unsigned char ch; int i = 0; while (*cp) { do { ch = rc32300_inb(SER_CMD); slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); rc32300_outb(*cp++, SER_DATA); } putch('\r'); putch('\n'); } void fputs(unsigned char *cp) { unsigned char ch; int i = 0; while (*cp) { do { ch = rc32300_inb(SER_CMD); slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); rc32300_outb(*cp++, SER_DATA); } } 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); }