patch-2.4.2 linux/arch/cris/kernel/debugport.c
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- 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);
+}
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