mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
|
|
*
|
|
* BRIEF MODULE DESCRIPTION
|
|
* Low level uart routines to directly access a 16550 uart.
|
|
*
|
|
* Copyright 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>
|
|
#include <asm/mach-au1x00/au1000.h>
|
|
|
|
#define SERIAL_BASE UART_BASE
|
|
#define SER_CMD 0x7
|
|
#define SER_DATA 0x1
|
|
#define TX_BUSY 0x20
|
|
|
|
#define TIMEOUT 0xffffff
|
|
#define SLOW_DOWN
|
|
|
|
static const char digits[16] = "0123456789abcdef";
|
|
static volatile unsigned long * const com1 = (unsigned long *)SERIAL_BASE;
|
|
|
|
|
|
#ifdef SLOW_DOWN
|
|
static inline void slow_down(void)
|
|
{
|
|
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(const 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);
|
|
}
|