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-rw-r--r--arch/mips/jmr3927/rbhma3100/kgdb_io.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/mips/jmr3927/rbhma3100/kgdb_io.c b/arch/mips/jmr3927/rbhma3100/kgdb_io.c
new file mode 100644
index 000000000000..269a42deae06
--- /dev/null
+++ b/arch/mips/jmr3927/rbhma3100/kgdb_io.c
@@ -0,0 +1,155 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ * Low level uart routines to directly access a TX[34]927 SIO.
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ * ahennessy@mvista.com or source@mvista.com
+ *
+ * Based on arch/mips/ddb5xxx/ddb5477/kgdb_io.c
+ *
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 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/jmr3927/txx927.h>
+#include <asm/jmr3927/tx3927.h>
+#include <asm/jmr3927/jmr3927.h>
+
+#define TIMEOUT 0xffffff
+#define SLOW_DOWN
+
+static const char digits[16] = "0123456789abcdef";
+
+#ifdef SLOW_DOWN
+#define slow_down() { int k; for (k=0; k<10000; k++); }
+#else
+#define slow_down()
+#endif
+
+static int remoteDebugInitialized = 0;
+
+int putDebugChar(unsigned char c)
+{
+ int i = 0;
+
+ if (!remoteDebugInitialized) {
+ remoteDebugInitialized = 1;
+ debugInit(38400);
+ }
+
+ do {
+ slow_down();
+ i++;
+ if (i>TIMEOUT) {
+ break;
+ }
+ } while (!(tx3927_sioptr(0)->cisr & TXx927_SICISR_TXALS));
+ tx3927_sioptr(0)->tfifo = c;
+
+ return 1;
+}
+
+unsigned char getDebugChar(void)
+{
+ int i = 0;
+ int dicr;
+ char c;
+
+ if (!remoteDebugInitialized) {
+ remoteDebugInitialized = 1;
+ debugInit(38400);
+ }
+
+ /* diable RX int. */
+ dicr = tx3927_sioptr(0)->dicr;
+ tx3927_sioptr(0)->dicr = 0;
+
+ do {
+ slow_down();
+ i++;
+ if (i>TIMEOUT) {
+ break;
+ }
+ } while (tx3927_sioptr(0)->disr & TXx927_SIDISR_UVALID)
+ ;
+ c = tx3927_sioptr(0)->rfifo;
+
+ /* clear RX int. status */
+ tx3927_sioptr(0)->disr &= ~TXx927_SIDISR_RDIS;
+ /* enable RX int. */
+ tx3927_sioptr(0)->dicr = dicr;
+
+ return c;
+}
+
+void debugInit(int baud)
+{
+ /*
+ volatile unsigned long lcr;
+ volatile unsigned long dicr;
+ volatile unsigned long disr;
+ volatile unsigned long cisr;
+ volatile unsigned long fcr;
+ volatile unsigned long flcr;
+ volatile unsigned long bgr;
+ volatile unsigned long tfifo;
+ volatile unsigned long rfifo;
+ */
+
+ tx3927_sioptr(0)->lcr = 0x020;
+ tx3927_sioptr(0)->dicr = 0;
+ tx3927_sioptr(0)->disr = 0x4100;
+ tx3927_sioptr(0)->cisr = 0x014;
+ tx3927_sioptr(0)->fcr = 0;
+ tx3927_sioptr(0)->flcr = 0x02;
+ tx3927_sioptr(0)->bgr = ((JMR3927_BASE_BAUD + baud / 2) / baud) |
+ TXx927_SIBGR_BCLK_T0;
+#if 0
+ /*
+ * Reset the UART.
+ */
+ tx3927_sioptr(0)->fcr = TXx927_SIFCR_SWRST;
+ while (tx3927_sioptr(0)->fcr & TXx927_SIFCR_SWRST)
+ ;
+
+ /*
+ * and set the speed of the serial port
+ * (currently hardwired to 9600 8N1
+ */
+
+ tx3927_sioptr(0)->lcr = TXx927_SILCR_UMODE_8BIT |
+ TXx927_SILCR_USBL_1BIT |
+ TXx927_SILCR_SCS_IMCLK_BG;
+ tx3927_sioptr(0)->bgr =
+ ((JMR3927_BASE_BAUD + baud / 2) / baud) |
+ TXx927_SIBGR_BCLK_T0;
+
+ /* HW RTS/CTS control */
+ if (ser->flags & ASYNC_HAVE_CTS_LINE)
+ tx3927_sioptr(0)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
+ TXx927_SIFLCR_RTSTL_MAX /* 15 */;
+ /* Enable RX/TX */
+ tx3927_sioptr(0)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
+#endif
+}
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