/* 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 1.6 2001/04/17 13:58:39 orjanf * * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB. * * Revision 1.5 2001/03/26 14:22:05 bjornw * Namechange of some config options * * Revision 1.4 2000/10/06 12:37:26 bjornw * Use physical addresses when talking to DMA * * */ #include #include #include #include #include #include #include /* Get SIMCOUT. */ /* Which serial-port is our debug port ? */ #if defined(CONFIG_ETRAX_DEBUG_PORT0) || defined(CONFIG_ETRAX_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_ETRAX_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_ETRAX_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_ETRAX_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_ETRAX_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_ETRAX_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); }