532 lines
12 KiB
C
532 lines
12 KiB
C
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/* Serialport functions for debugging
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*
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* Copyright (c) 2000 Axis Communications AB
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*
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* Authors: Bjorn Wesen
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*
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* Exports:
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* console_print_etrax(char *buf)
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* int getDebugChar()
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* putDebugChar(int)
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* enableDebugIRQ()
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* init_etrax_debug()
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*
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* $Log: debugport.c,v $
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* Revision 1.19 2004/10/21 07:26:16 starvik
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* Made it possible to specify console settings on kernel command line.
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*
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* Revision 1.18 2004/10/19 13:07:37 starvik
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* Merge of Linux 2.6.9
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*
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* Revision 1.17 2004/09/29 10:33:46 starvik
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* Resolved a dealock when printing debug from kernel.
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*
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* Revision 1.16 2004/08/24 06:12:19 starvik
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* Whitespace cleanup
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*
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* Revision 1.15 2004/08/16 12:37:19 starvik
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* Merge of Linux 2.6.8
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*
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* Revision 1.14 2004/05/17 13:11:29 starvik
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* Disable DMA until real serial driver is up
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*
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* Revision 1.13 2004/05/14 07:58:01 starvik
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* Merge of changes from 2.4
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*
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* Revision 1.12 2003/09/11 07:29:49 starvik
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* Merge of Linux 2.6.0-test5
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*
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* Revision 1.11 2003/07/07 09:53:36 starvik
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* Revert all the 2.5.74 merge changes to make the console work again
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*
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* Revision 1.9 2003/02/17 17:07:23 starvik
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* Solved the problem with corrupted debug output (from Linux 2.4)
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* * Wait until DMA, FIFO and pipe is empty before and after transmissions
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* * Buffer data until a FIFO flush can be triggered.
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*
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* Revision 1.8 2003/01/22 06:48:36 starvik
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* Fixed warnings issued by GCC 3.2.1
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*
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* Revision 1.7 2002/12/12 08:26:32 starvik
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* Don't use C-comments inside CVS comments
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*
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* Revision 1.6 2002/12/11 15:42:02 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/
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*
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* Revision 1.5 2002/11/20 06:58:03 starvik
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* Compiles with kgdb
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*
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* Revision 1.4 2002/11/19 14:35:24 starvik
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* Changes from linux 2.4
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* Changed struct initializer syntax to the currently prefered notation
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*
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* Revision 1.3 2002/11/06 09:47:03 starvik
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* Modified for new interrupt macros
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*
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* Revision 1.2 2002/01/21 15:21:50 bjornw
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* Update for kdev_t changes
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*
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* Revision 1.6 2001/04/17 13:58:39 orjanf
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* * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB.
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*
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* Revision 1.5 2001/03/26 14:22:05 bjornw
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* Namechange of some config options
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*
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* Revision 1.4 2000/10/06 12:37:26 bjornw
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* Use physical addresses when talking to DMA
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*
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*
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*/
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#include <linux/config.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/major.h>
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#include <linux/delay.h>
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#include <linux/tty.h>
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#include <asm/system.h>
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#include <asm/arch/svinto.h>
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#include <asm/io.h> /* Get SIMCOUT. */
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struct dbg_port
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{
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unsigned int index;
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const volatile unsigned* read;
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volatile char* write;
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volatile unsigned* xoff;
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volatile char* baud;
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volatile char* tr_ctrl;
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volatile char* rec_ctrl;
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unsigned long irq;
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unsigned int started;
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unsigned long baudrate;
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unsigned char parity;
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unsigned int bits;
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};
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struct dbg_port ports[]=
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{
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{
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0,
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R_SERIAL0_READ,
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R_SERIAL0_TR_DATA,
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R_SERIAL0_XOFF,
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R_SERIAL0_BAUD,
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R_SERIAL0_TR_CTRL,
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R_SERIAL0_REC_CTRL,
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IO_STATE(R_IRQ_MASK1_SET, ser0_data, set)
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},
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{
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1,
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R_SERIAL1_READ,
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R_SERIAL1_TR_DATA,
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R_SERIAL1_XOFF,
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R_SERIAL1_BAUD,
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R_SERIAL1_TR_CTRL,
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R_SERIAL1_REC_CTRL,
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IO_STATE(R_IRQ_MASK1_SET, ser1_data, set)
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},
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{
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2,
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R_SERIAL2_READ,
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R_SERIAL2_TR_DATA,
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R_SERIAL2_XOFF,
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R_SERIAL2_BAUD,
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R_SERIAL2_TR_CTRL,
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R_SERIAL2_REC_CTRL,
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IO_STATE(R_IRQ_MASK1_SET, ser2_data, set)
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},
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{
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3,
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R_SERIAL3_READ,
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R_SERIAL3_TR_DATA,
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R_SERIAL3_XOFF,
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R_SERIAL3_BAUD,
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R_SERIAL3_TR_CTRL,
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R_SERIAL3_REC_CTRL,
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IO_STATE(R_IRQ_MASK1_SET, ser3_data, set)
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}
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};
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static struct tty_driver *serial_driver;
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struct dbg_port* port =
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#if defined(CONFIG_ETRAX_DEBUG_PORT0)
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&ports[0];
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#elif defined(CONFIG_ETRAX_DEBUG_PORT1)
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&ports[1];
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#elif defined(CONFIG_ETRAX_DEBUG_PORT2)
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&ports[2];
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#elif defined(CONFIG_ETRAX_DEBUG_PORT3)
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&ports[3];
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#else
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NULL;
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#endif
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/* Used by serial.c to register a debug_write_function so that the normal
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* serial driver is used for kernel debug output
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*/
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typedef int (*debugport_write_function)(int i, const char *buf, unsigned int len);
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debugport_write_function debug_write_function = NULL;
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static void
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start_port(void)
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{
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unsigned long rec_ctrl = 0;
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unsigned long tr_ctrl = 0;
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if (!port)
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return;
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if (port->started)
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return;
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port->started = 1;
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if (port->index == 0)
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{
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
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}
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else if (port->index == 1)
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{
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
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}
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else if (port->index == 2)
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{
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser2, select);
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}
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else
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{
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
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genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
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genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser3, select);
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}
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*R_GEN_CONFIG = genconfig_shadow;
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*port->xoff =
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IO_STATE(R_SERIAL0_XOFF, tx_stop, enable) |
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IO_STATE(R_SERIAL0_XOFF, auto_xoff, disable) |
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IO_FIELD(R_SERIAL0_XOFF, xoff_char, 0);
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switch (port->baudrate)
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{
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case 0:
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case 115200:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
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break;
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case 1200:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c1200Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c1200Hz);
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break;
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case 2400:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c2400Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c2400Hz);
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break;
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case 4800:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c4800Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c4800Hz);
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break;
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case 9600:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c9600Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c9600Hz);
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break;
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case 19200:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c19k2Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c19k2Hz);
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break;
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case 38400:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c38k4Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c38k4Hz);
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break;
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case 57600:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c57k6Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c57k6Hz);
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break;
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default:
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*port->baud =
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IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
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IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
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break;
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}
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if (port->parity == 'E') {
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rec_ctrl =
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
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tr_ctrl =
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
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} else if (port->parity == 'O') {
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rec_ctrl =
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd) |
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
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tr_ctrl =
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd) |
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
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} else {
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rec_ctrl =
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
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IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, disable);
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tr_ctrl =
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
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IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, disable);
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}
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if (port->bits == 7)
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{
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rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
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tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
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}
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else
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{
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rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit);
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tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit);
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}
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*port->rec_ctrl =
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IO_STATE(R_SERIAL0_REC_CTRL, dma_err, stop) |
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IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable) |
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IO_STATE(R_SERIAL0_REC_CTRL, rts_, active) |
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IO_STATE(R_SERIAL0_REC_CTRL, sampling, middle) |
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IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, normal) |
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rec_ctrl;
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*port->tr_ctrl =
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IO_FIELD(R_SERIAL0_TR_CTRL, txd, 0) |
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IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable) |
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IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, disabled) |
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IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, one_bit) |
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IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, normal) |
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tr_ctrl;
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}
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static void
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console_write_direct(struct console *co, const char *buf, unsigned int len)
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{
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int i;
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unsigned long flags;
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local_irq_save(flags);
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/* Send data */
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for (i = 0; i < len; i++) {
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/* Wait until transmitter is ready and send.*/
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while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
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;
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*port->write = buf[i];
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}
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local_irq_restore(flags);
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}
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static void
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console_write(struct console *co, const char *buf, unsigned int len)
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{
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if (!port)
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return;
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#ifdef CONFIG_SVINTO_SIM
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/* no use to simulate the serial debug output */
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SIMCOUT(buf, len);
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return;
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#endif
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start_port();
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#ifdef CONFIG_ETRAX_KGDB
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/* kgdb needs to output debug info using the gdb protocol */
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putDebugString(buf, len);
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return;
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||
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|
#endif
|
||
|
|
|
||
|
|
if (debug_write_function)
|
||
|
|
debug_write_function(co->index, buf, len);
|
||
|
|
else
|
||
|
|
console_write_direct(co, buf, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* legacy function */
|
||
|
|
|
||
|
|
void
|
||
|
|
console_print_etrax(const char *buf)
|
||
|
|
{
|
||
|
|
console_write(NULL, buf, strlen(buf));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Use polling to get a single character FROM the debug port */
|
||
|
|
|
||
|
|
int
|
||
|
|
getDebugChar(void)
|
||
|
|
{
|
||
|
|
unsigned long readval;
|
||
|
|
|
||
|
|
do {
|
||
|
|
readval = *port->read;
|
||
|
|
} while (!(readval & IO_MASK(R_SERIAL0_READ, data_avail)));
|
||
|
|
|
||
|
|
return (readval & IO_MASK(R_SERIAL0_READ, data_in));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Use polling to put a single character to the debug port */
|
||
|
|
|
||
|
|
void
|
||
|
|
putDebugChar(int val)
|
||
|
|
{
|
||
|
|
while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
|
||
|
|
;
|
||
|
|
*port->write = val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Enable irq for receiving chars on the debug port, used by kgdb */
|
||
|
|
|
||
|
|
void
|
||
|
|
enableDebugIRQ(void)
|
||
|
|
{
|
||
|
|
*R_IRQ_MASK1_SET = port->irq;
|
||
|
|
/* use R_VECT_MASK directly, since we really bypass Linux normal
|
||
|
|
* IRQ handling in kgdb anyway, we don't need to use enable_irq
|
||
|
|
*/
|
||
|
|
*R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
|
||
|
|
|
||
|
|
*port->rec_ctrl = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct tty_driver*
|
||
|
|
etrax_console_device(struct console* co, int *index)
|
||
|
|
{
|
||
|
|
return serial_driver;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init
|
||
|
|
console_setup(struct console *co, char *options)
|
||
|
|
{
|
||
|
|
char* s;
|
||
|
|
|
||
|
|
if (options) {
|
||
|
|
port = &ports[co->index];
|
||
|
|
port->baudrate = 115200;
|
||
|
|
port->parity = 'N';
|
||
|
|
port->bits = 8;
|
||
|
|
port->baudrate = simple_strtoul(options, NULL, 10);
|
||
|
|
s = options;
|
||
|
|
while(*s >= '0' && *s <= '9')
|
||
|
|
s++;
|
||
|
|
if (*s) port->parity = *s++;
|
||
|
|
if (*s) port->bits = *s++ - '0';
|
||
|
|
port->started = 0;
|
||
|
|
start_port();
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct console sercons = {
|
||
|
|
name : "ttyS",
|
||
|
|
write: console_write,
|
||
|
|
read : NULL,
|
||
|
|
device : etrax_console_device,
|
||
|
|
unblank : NULL,
|
||
|
|
setup : console_setup,
|
||
|
|
flags : CON_PRINTBUFFER,
|
||
|
|
index : -1,
|
||
|
|
cflag : 0,
|
||
|
|
next : NULL
|
||
|
|
};
|
||
|
|
static struct console sercons0 = {
|
||
|
|
name : "ttyS",
|
||
|
|
write: console_write,
|
||
|
|
read : NULL,
|
||
|
|
device : etrax_console_device,
|
||
|
|
unblank : NULL,
|
||
|
|
setup : console_setup,
|
||
|
|
flags : CON_PRINTBUFFER,
|
||
|
|
index : 0,
|
||
|
|
cflag : 0,
|
||
|
|
next : NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct console sercons1 = {
|
||
|
|
name : "ttyS",
|
||
|
|
write: console_write,
|
||
|
|
read : NULL,
|
||
|
|
device : etrax_console_device,
|
||
|
|
unblank : NULL,
|
||
|
|
setup : console_setup,
|
||
|
|
flags : CON_PRINTBUFFER,
|
||
|
|
index : 1,
|
||
|
|
cflag : 0,
|
||
|
|
next : NULL
|
||
|
|
};
|
||
|
|
static struct console sercons2 = {
|
||
|
|
name : "ttyS",
|
||
|
|
write: console_write,
|
||
|
|
read : NULL,
|
||
|
|
device : etrax_console_device,
|
||
|
|
unblank : NULL,
|
||
|
|
setup : console_setup,
|
||
|
|
flags : CON_PRINTBUFFER,
|
||
|
|
index : 2,
|
||
|
|
cflag : 0,
|
||
|
|
next : NULL
|
||
|
|
};
|
||
|
|
static struct console sercons3 = {
|
||
|
|
name : "ttyS",
|
||
|
|
write: console_write,
|
||
|
|
read : NULL,
|
||
|
|
device : etrax_console_device,
|
||
|
|
unblank : NULL,
|
||
|
|
setup : console_setup,
|
||
|
|
flags : CON_PRINTBUFFER,
|
||
|
|
index : 3,
|
||
|
|
cflag : 0,
|
||
|
|
next : NULL
|
||
|
|
};
|
||
|
|
/*
|
||
|
|
* Register console (for printk's etc)
|
||
|
|
*/
|
||
|
|
|
||
|
|
int __init
|
||
|
|
init_etrax_debug(void)
|
||
|
|
{
|
||
|
|
static int first = 1;
|
||
|
|
|
||
|
|
if (!first) {
|
||
|
|
if (!port) {
|
||
|
|
register_console(&sercons0);
|
||
|
|
register_console(&sercons1);
|
||
|
|
register_console(&sercons2);
|
||
|
|
register_console(&sercons3);
|
||
|
|
unregister_console(&sercons);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
first = 0;
|
||
|
|
if (port)
|
||
|
|
register_console(&sercons);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int __init
|
||
|
|
init_console(void)
|
||
|
|
{
|
||
|
|
serial_driver = alloc_tty_driver(1);
|
||
|
|
if (!serial_driver)
|
||
|
|
return -ENOMEM;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
__initcall(init_etrax_debug);
|