/* * linux/arch/m68k/atari/debug.c * * Atari debugging and serial console stuff * * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file COPYING in the main directory of this archive * for more details. */ #include <linux/types.h>#include <linux/tty.h>#include <linux/console.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/module.h> #include <asm/atarihw.h>#include <asm/atariints.h> /* Can be set somewhere, if a SCC master reset has already be done and should * not be repeated; used by kgdb */int atari_SCC_reset_done;EXPORT_SYMBOL(atari_SCC_reset_done); static struct console atari_console_driver = {	.name	= "debug",	.flags	= CON_PRINTBUFFER,	.index	= -1,};  static inline void ata_mfp_out(char c){	while (!(st_mfp.trn_stat & 0x80))	/* wait for tx buf empty */		barrier();	st_mfp.usart_dta = c;} static void atari_mfp_console_write(struct console *co, const char *str,				    unsigned int count){	while (count--) {		if (*str == '\n')			ata_mfp_out('\r');		ata_mfp_out(*str++);	}} static inline void ata_scc_out(char c){	do {		MFPDELAY();	} while (!(atari_scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */	MFPDELAY();	atari_scc.cha_b_data = c;} static void atari_scc_console_write(struct console *co, const char *str,				    unsigned int count){	while (count--) {		if (*str == '\n')			ata_scc_out('\r');		ata_scc_out(*str++);	}} static inline void ata_midi_out(char c){	while (!(acia.mid_ctrl & ACIA_TDRE))	/* wait for tx buf empty */		barrier();	acia.mid_data = c;} static void atari_midi_console_write(struct console *co, const char *str,				     unsigned int count){	while (count--) {		if (*str == '\n')			ata_midi_out('\r');		ata_midi_out(*str++);	}} static int ata_par_out(char c){	unsigned char tmp;	/* This a some-seconds timeout in case no printer is connected */	unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ; 	while ((st_mfp.par_dt_reg & 1) && --i) /* wait for BUSY == L */		;	if (!i)		return 0; 	sound_ym.rd_data_reg_sel = 15;	/* select port B */	sound_ym.wd_data = c;		/* put char onto port */	sound_ym.rd_data_reg_sel = 14;	/* select port A */	tmp = sound_ym.rd_data_reg_sel;	sound_ym.wd_data = tmp & ~0x20;	/* set strobe L */	MFPDELAY();			/* wait a bit */	sound_ym.wd_data = tmp | 0x20;	/* set strobe H */	return 1;} static void atari_par_console_write(struct console *co, const char *str,				    unsigned int count){	static int printer_present = 1; 	if (!printer_present)		return; 	while (count--) {		if (*str == '\n') {			if (!ata_par_out('\r')) {				printer_present = 0;				return;			}		}		if (!ata_par_out(*str++)) {			printer_present = 0;			return;		}	}} #if 0int atari_mfp_console_wait_key(struct console *co){	while (!(st_mfp.rcv_stat & 0x80))	/* wait for rx buf filled */		barrier();	return st_mfp.usart_dta;} int atari_scc_console_wait_key(struct console *co){	do {		MFPDELAY();	} while (!(atari_scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */	MFPDELAY();	return atari_scc.cha_b_data;} int atari_midi_console_wait_key(struct console *co){	while (!(acia.mid_ctrl & ACIA_RDRF)) /* wait for rx buf filled */		barrier();	return acia.mid_data;}#endif /* * The following two functions do a quick'n'dirty initialization of the MFP or * SCC serial ports. They're used by the debugging interface, kgdb, and the * serial console code. */static void __init atari_init_mfp_port(int cflag){	/*	 * timer values for 1200...115200 bps; > 38400 select 110, 134, or 150	 * bps, resp., and work only correct if there's a RSVE or RSSPEED	 */	static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };	int baud = cflag & CBAUD;	int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;	int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00; 	if (cflag & CBAUDEX)		baud += B38400;	if (baud < B1200 || baud > B38400+2)		baud = B9600;		/* use default 9600bps for non-implemented rates */	baud -= B1200;			/* baud_table[] starts at 1200bps */ 	st_mfp.trn_stat &= ~0x01;	/* disable TX */	st_mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */	st_mfp.tim_ct_cd &= 0x70;	/* stop timer D */	st_mfp.tim_dt_d = baud_table[baud];	st_mfp.tim_ct_cd |= 0x01;	/* start timer D, 1:4 */	st_mfp.trn_stat |= 0x01;	/* enable TX */} #define SCC_WRITE(reg, val)				\	do {						\		atari_scc.cha_b_ctrl = (reg);		\		MFPDELAY();				\		atari_scc.cha_b_ctrl = (val);		\		MFPDELAY();				\	} while (0) /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a * delay of ~ 60us. */#define LONG_DELAY()					\	do {						\		int i;					\		for (i = 100; i > 0; --i)		\			MFPDELAY();			\	} while (0) static void __init atari_init_scc_port(int cflag){	static int clksrc_table[9] =		/* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */		{ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };	static int brgsrc_table[9] =		/* reg 14: 0 = RTxC, 2 = PCLK */		{ 2, 2, 2, 2, 2, 2, 0, 2, 2 };	static int clkmode_table[9] =		/* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */		{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };	static int div_table[9] =		/* reg12 (BRG low) */		{ 208, 138, 103, 50, 24, 11, 1, 0, 0 }; 	int baud = cflag & CBAUD;	int clksrc, clkmode, div, reg3, reg5; 	if (cflag & CBAUDEX)		baud += B38400;	if (baud < B1200 || baud > B38400+2)		baud = B9600;		/* use default 9600bps for non-implemented rates */	baud -= B1200;			/* tables starts at 1200bps */ 	clksrc  = clksrc_table[baud];	clkmode = clkmode_table[baud];	div     = div_table[baud];	if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {		/* special treatment for TT, where rates >= 38400 are done via TRxC */		clksrc = 0x28;		/* TRxC */		clkmode = baud == 6 ? 0xc0 :			  baud == 7 ? 0x80 : /* really 76800bps */				      0x40;  /* really 153600bps */		div = 0;	} 	reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;	reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */; 	(void)atari_scc.cha_b_ctrl;	/* reset reg pointer */	SCC_WRITE(9, 0xc0);		/* reset */	LONG_DELAY();			/* extra delay after WR9 access */	SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03)				      : 0 | 0x04 /* 1 stopbit */ | clkmode);	SCC_WRITE(3, reg3);	SCC_WRITE(5, reg5);	SCC_WRITE(9, 0);		/* no interrupts */	LONG_DELAY();			/* extra delay after WR9 access */	SCC_WRITE(10, 0);		/* NRZ mode */	SCC_WRITE(11, clksrc);		/* main clock source */	SCC_WRITE(12, div);		/* BRG value */	SCC_WRITE(13, 0);		/* BRG high byte */	SCC_WRITE(14, brgsrc_table[baud]);	SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0));	SCC_WRITE(3, reg3 | 1);	SCC_WRITE(5, reg5 | 8); 	atari_SCC_reset_done = 1;} static void __init atari_init_midi_port(int cflag){	int baud = cflag & CBAUD;	int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;	/* warning 7N1 isn't possible! (instead 7O2 is used...) */	int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;	int div; 	/* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as	 * default) the standard MIDI speed 31250. */	if (cflag & CBAUDEX)		baud += B38400;	if (baud == B4800)		div = ACIA_DIV64;	/* really 7812.5 bps */	else if (baud == B38400+2 /* 115200 */)		div = ACIA_DIV1;	/* really 500 kbps (does that work??) */	else		div = ACIA_DIV16;	/* 31250 bps, standard for MIDI */ 	/* RTS low, ints disabled */	acia.mid_ctrl = div | csize | parity |		    ((atari_switches & ATARI_SWITCH_MIDI) ?		     ACIA_RHTID : ACIA_RLTID);} static int __init atari_debug_setup(char *arg){	bool registered; 	if (!MACH_IS_ATARI)		return 0; 	if (!strcmp(arg, "ser"))		/* defaults to ser2 for a Falcon and ser1 otherwise */		arg = MACH_IS_FALCON ? "ser2" : "ser1"; 	registered = !!atari_console_driver.write;	if (!strcmp(arg, "ser1")) {		/* ST-MFP Modem1 serial port */		atari_init_mfp_port(B9600|CS8);		atari_console_driver.write = atari_mfp_console_write;	} else if (!strcmp(arg, "ser2")) {		/* SCC Modem2 serial port */		atari_init_scc_port(B9600|CS8);		atari_console_driver.write = atari_scc_console_write;	} else if (!strcmp(arg, "midi")) {		/* MIDI port */		atari_init_midi_port(B9600|CS8);		atari_console_driver.write = atari_midi_console_write;	} else if (!strcmp(arg, "par")) {		/* parallel printer */		atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */		sound_ym.rd_data_reg_sel = 7;	/* select mixer control */		sound_ym.wd_data = 0xff;	/* sound off, ports are output */		sound_ym.rd_data_reg_sel = 15;	/* select port B */		sound_ym.wd_data = 0;		/* no char */		sound_ym.rd_data_reg_sel = 14;	/* select port A */		sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */		atari_console_driver.write = atari_par_console_write;	}	if (atari_console_driver.write && !registered)		register_console(&atari_console_driver); 	return 0;} early_param("debug", atari_debug_setup);