patch-2.4.22 linux-2.4.22/arch/mips/gt64120/ev64120/serialGT.c
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- Lines: 213
- Date:
2003-08-25 04:44:40.000000000 -0700
- Orig file:
linux-2.4.21/arch/mips/gt64120/ev64120/serialGT.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/arch/mips/gt64120/ev64120/serialGT.c linux-2.4.22/arch/mips/gt64120/ev64120/serialGT.c
@@ -0,0 +1,212 @@
+/*
+ * 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 "buad 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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