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-rw-r--r--arch/mips/gt64120/ev64120/serialGT.c212
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diff --git a/arch/mips/gt64120/ev64120/serialGT.c b/arch/mips/gt64120/ev64120/serialGT.c
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-/*
- * serialGT.c
- *
- * BRIEF MODULE DESCRIPTION
- * Low Level Serial Port control for use
- * with the Galileo EVB64120A MIPS eval board and
- * its on board two channel 16552 Uart.
- *
- * Copyright (C) 2000 RidgeRun, Inc.
- * Author: RidgeRun, Inc.
- * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.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.
- *
- */
-
-// Note:
-// Serial CHANNELS - 0 is the bottom connector of evb64120A.
-// (The one that maps to the "B" channel of the
-// board's uart)
-// 1 is the top connector of evb64120A.
-// (The one that maps to the "A" channel of the
-// board's uart)
-int DEBUG_CHANNEL = 0; // See Note Above
-int CONSOLE_CHANNEL = 1; // See Note Above
-
-#define DUART 0xBD000000 /* Base address of Uart. */
-#define CHANNELOFFSET 0x20 /* DUART+CHANNELOFFSET gets you to the ChanA
- register set of the 16552 Uart device.
- DUART+0 gets you to the ChanB register set.
- */
-#define DUART_DELTA 0x4
-#define FIFO_ENABLE 0x07
-#define INT_ENABLE 0x04 /* default interrupt mask */
-
-#define RBR 0x00
-#define THR 0x00
-#define DLL 0x00
-#define IER 0x01
-#define DLM 0x01
-#define IIR 0x02
-#define FCR 0x02
-#define LCR 0x03
-#define MCR 0x04
-#define LSR 0x05
-#define MSR 0x06
-#define SCR 0x07
-
-#define LCR_DLAB 0x80
-#define XTAL 1843200
-#define LSR_THRE 0x20
-#define LSR_BI 0x10
-#define LSR_DR 0x01
-#define MCR_LOOP 0x10
-#define ACCESS_DELAY 0x10000
-
-/******************************
- Routine:
- Description:
- ******************************/
-int inreg(int channel, int reg)
-{
- int val;
- val =
- *((volatile unsigned char *) DUART +
- (channel * CHANNELOFFSET) + (reg * DUART_DELTA));
- return val;
-}
-
-/******************************
- Routine:
- Description:
- ******************************/
-void outreg(int channel, int reg, unsigned char val)
-{
- *((volatile unsigned char *) DUART + (channel * CHANNELOFFSET)
- + (reg * DUART_DELTA)) = val;
-}
-
-/******************************
- Routine:
- Description:
- Initialize the device driver.
- ******************************/
-void serial_init(int channel)
-{
- /*
- * Configure active port, (CHANNELOFFSET already set.)
- *
- * Set 8 bits, 1 stop bit, no parity.
- *
- * LCR<7> 0 divisor latch access bit
- * LCR<6> 0 break control (1=send break)
- * LCR<5> 0 stick parity (0=space, 1=mark)
- * LCR<4> 0 parity even (0=odd, 1=even)
- * LCR<3> 0 parity enable (1=enabled)
- * LCR<2> 0 # stop bits (0=1, 1=1.5)
- * LCR<1:0> 11 bits per character(00=5, 01=6, 10=7, 11=8)
- */
- outreg(channel, LCR, 0x3);
-
- outreg(channel, FCR, FIFO_ENABLE); /* Enable the FIFO */
-
- outreg(channel, IER, INT_ENABLE); /* Enable appropriate interrupts */
-}
-
-/******************************
- Routine:
- Description:
- Set the baud rate.
- ******************************/
-void serial_set(int channel, unsigned long baud)
-{
- unsigned char sav_lcr;
-
- /*
- * Enable access to the divisor latches by setting DLAB in LCR.
- *
- */
- sav_lcr = inreg(channel, LCR);
-
-#if 0
- /*
- * Set baud rate
- */
- outreg(channel, LCR, LCR_DLAB | sav_lcr);
- // outreg(DLL,(XTAL/(16*2*(baud))-2));
- outreg(channel, DLL, XTAL / (16 * baud));
- // outreg(DLM,(XTAL/(16*2*(baud))-2)>>8);
- outreg(channel, DLM, (XTAL / (16 * baud)) >> 8);
-#else
- /*
- * Note: Set baud rate, hardcoded here for rate of 115200
- * since became unsure of above "baud rate" algorithm (??).
- */
- outreg(channel, LCR, 0x83);
- outreg(channel, DLM, 0x00); // See note above
- outreg(channel, DLL, 0x02); // See note above.
- outreg(channel, LCR, 0x03);
-#endif
-
- /*
- * Restore line control register
- */
- outreg(channel, LCR, sav_lcr);
-}
-
-
-/******************************
- Routine:
- Description:
- Transmit a character.
- ******************************/
-void serial_putc(int channel, int c)
-{
- while ((inreg(channel, LSR) & LSR_THRE) == 0);
- outreg(channel, THR, c);
-}
-
-/******************************
- Routine:
- Description:
- Read a received character if one is
- available. Return -1 otherwise.
- ******************************/
-int serial_getc(int channel)
-{
- if (inreg(channel, LSR) & LSR_DR) {
- return inreg(channel, RBR);
- }
- return -1;
-}
-
-/******************************
- Routine:
- Description:
- Used by embedded gdb client. (example; gdb-stub.c)
- ******************************/
-char getDebugChar()
-{
- int val;
- while ((val = serial_getc(DEBUG_CHANNEL)) == -1); // loop until we get a character in.
- return (char) val;
-}
-
-/******************************
- Routine:
- Description:
- Used by embedded gdb target. (example; gdb-stub.c)
- ******************************/
-void putDebugChar(char c)
-{
- serial_putc(DEBUG_CHANNEL, (int) c);
-}
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