diff options
Diffstat (limited to 'arch/mips/jmr3927/rbhma3100/kgdb_io.c')
| -rw-r--r-- | arch/mips/jmr3927/rbhma3100/kgdb_io.c | 155 |
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 +} |