patch-2.4.2 linux/arch/cris/kernel/debugport.c

• Lines: 243
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/arch/cris/kernel/debugport.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/cris/kernel/debugport.c linux/arch/cris/kernel/debugport.c
@@ -0,0 +1,242 @@
+/* Serialport functions for debugging
+ *
+ * Copyright (c) 2000 Axis Communications AB
+ *
+ * Authors:  Bjorn Wesen
+ *
+ * Exports:
+ *    console_print_etrax(char *buf)
+ *    int getDebugChar()
+ *    putDebugChar(int)
+ *    enableDebugIRQ()
+ *    init_etrax_debug()
+ *
+ * $Log: debugport.c,v $
+ * Revision 1.4  2000/10/06 12:37:26  bjornw
+ * Use physical addresses when talking to DMA
+ *
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/major.h>
+
+#include <asm/system.h>
+#include <asm/svinto.h>
+#include <asm/io.h>             /* Get SIMCOUT. */
+
+/* Which serial-port is our debug port ? */
+
+#if defined(CONFIG_DEBUG_PORT0) || defined(CONFIG_DEBUG_PORT_NULL)
+#define DEBUG_PORT_IDX 0
+#define DEBUG_OCMD R_DMA_CH6_CMD
+#define DEBUG_FIRST R_DMA_CH6_FIRST
+#define DEBUG_OCLRINT R_DMA_CH6_CLR_INTR
+#define DEBUG_STATUS R_DMA_CH6_STATUS
+#define DEBUG_READ R_SERIAL0_READ
+#define DEBUG_WRITE R_SERIAL0_TR_DATA
+#define DEBUG_TR_CTRL R_SERIAL0_TR_CTRL
+#define DEBUG_REC_CTRL R_SERIAL0_REC_CTRL
+#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser0_data, set)
+#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma6_descr, clr)
+#endif
+
+#ifdef CONFIG_DEBUG_PORT1
+#define DEBUG_PORT_IDX 1
+#define DEBUG_OCMD R_DMA_CH8_CMD
+#define DEBUG_FIRST R_DMA_CH8_FIRST
+#define DEBUG_OCLRINT R_DMA_CH8_CLR_INTR
+#define DEBUG_STATUS R_DMA_CH8_STATUS
+#define DEBUG_READ R_SERIAL1_READ
+#define DEBUG_WRITE R_SERIAL1_TR_DATA
+#define DEBUG_TR_CTRL R_SERIAL1_TR_CTRL
+#define DEBUG_REC_CTRL R_SERIAL1_REC_CTRL
+#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser1_data, set)
+#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma8_descr, clr)
+#endif
+
+#ifdef CONFIG_DEBUG_PORT2
+#define DEBUG_PORT_IDX 2
+#define DEBUG_OCMD R_DMA_CH2_CMD
+#define DEBUG_FIRST R_DMA_CH2_FIRST
+#define DEBUG_OCLRINT R_DMA_CH2_CLR_INTR
+#define DEBUG_STATUS R_DMA_CH2_STATUS
+#define DEBUG_READ R_SERIAL2_READ
+#define DEBUG_WRITE R_SERIAL2_TR_DATA
+#define DEBUG_TR_CTRL R_SERIAL2_TR_CTRL
+#define DEBUG_REC_CTRL R_SERIAL2_REC_CTRL
+#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser2_data, set)
+#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma2_descr, clr)
+#endif
+
+#ifdef CONFIG_DEBUG_PORT3
+#define DEBUG_PORT_IDX 3
+#define DEBUG_OCMD R_DMA_CH4_CMD
+#define DEBUG_FIRST R_DMA_CH4_FIRST
+#define DEBUG_OCLRINT R_DMA_CH4_CLR_INTR
+#define DEBUG_STATUS R_DMA_CH4_STATUS
+#define DEBUG_READ R_SERIAL3_READ
+#define DEBUG_WRITE R_SERIAL3_TR_DATA
+#define DEBUG_TR_CTRL R_SERIAL3_TR_CTRL
+#define DEBUG_REC_CTRL R_SERIAL3_REC_CTRL
+#define DEBUG_IRQ IO_STATE(R_IRQ_MASK1_SET, ser3_data, set)
+#define DEBUG_DMA_IRQ_CLR IO_STATE(R_IRQ_MASK2_CLR, dma4_descr, clr)
+#endif
+
+/* Write a string of count length to the console (debug port) using DMA, polled
+ * for completion. Interrupts are disabled during the whole process. Some
+ * caution needs to be taken to not interfere with ttyS business on this port.
+ */
+
+static void 
+console_write(struct console *co, const char *buf, unsigned int len)
+{
+	static struct etrax_dma_descr descr;
+	unsigned long flags; 
+	int in_progress;
+	
+#ifdef CONFIG_DEBUG_PORT_NULL
+        /* no debug printout at all */
+        return;
+#endif
+
+#ifdef CONFIG_SVINTO_SIM
+	/* no use to simulate the serial debug output */
+	SIMCOUT(buf,len);
+	return;
+#endif
+	
+	save_flags(flags);
+	cli();
+
+#ifdef CONFIG_KGDB
+	/* kgdb needs to output debug info using the gdb protocol */
+	putDebugString(buf, len);
+	restore_flags(flags);
+	return;
+#endif
+
+	/* make sure the transmitter is enabled. 
+	 * NOTE: this overrides any setting done in ttySx, to 8N1, no auto-CTS.
+	 * in the future, move the tr/rec_ctrl shadows from etrax100ser.c to
+	 * shadows.c and use it here as well...
+	 */
+
+	*DEBUG_TR_CTRL = 0x40;
+
+	/* if the tty has some ongoing business, remember it */
+
+	in_progress = *DEBUG_OCMD & 7;
+
+	if(in_progress) {
+		/* wait until the output dma channel is ready */
+		
+		while(*DEBUG_OCMD & 7) /* nothing */ ;
+	}
+
+	descr.ctrl = d_eol;
+	descr.sw_len = len;
+	descr.buf = __pa(buf);
+
+	*DEBUG_FIRST = __pa(&descr); /* write to R_DMAx_FIRST */
+	*DEBUG_OCMD = 1;       /* dma command start -> R_DMAx_CMD */
+
+	/* wait until the output dma channel is ready again */
+
+	while(*DEBUG_OCMD & 7) /* nothing */;
+
+	/* clear pending interrupts so we don't get a surprise below */
+
+	if(in_progress)
+		*DEBUG_OCLRINT = 2;  /* only clear EOP, leave DESCR for the tty */
+	else
+		*DEBUG_OCLRINT = 3;  /* clear both EOP and DESCR */
+
+	while(*DEBUG_STATUS & 0x7f); /* wait until output FIFO is empty as well */
+
+	restore_flags(flags);
+}
+
+/* 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 = *DEBUG_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(!(*DEBUG_READ & IO_MASK(R_SERIAL0_READ, tr_ready))) ;
+;
+	*DEBUG_WRITE = val;
+}
+
+/* Enable irq for receiving chars on the debug port, used by kgdb */
+
+void
+enableDebugIRQ(void)
+{
+	*R_IRQ_MASK1_SET = DEBUG_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);
+
+	*DEBUG_REC_CTRL = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
+}
+
+static kdev_t 
+console_device(struct console *c)
+{
+         return MKDEV(TTY_MAJOR, 64 + c->index);
+}
+
+static int __init 
+console_setup(struct console *co, char *options)
+{
+        return 0;
+}
+
+static struct console sercons = {
+        "ttyS",
+        console_write,
+        NULL,
+        console_device,
+        NULL,
+	NULL,
+	console_setup,
+	CON_PRINTBUFFER,
+	DEBUG_PORT_IDX,
+	0,
+	NULL
+};
+
+/*
+ *      Register console (for printk's etc)
+ */
+
+void __init 
+init_etrax_debug(void)
+{
+	register_console(&sercons);
+}