arch/m68k/atari/debug.c - kernel/prism - Git at Google

 /*
  * 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 (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
 	MFPDELAY();
 	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 0
 int 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 (!(scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
 	MFPDELAY();
 	return 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 {						\
 		scc.cha_b_ctrl = (reg);			\
 		MFPDELAY();				\
 		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)
 {
 	extern int atari_SCC_reset_done;
 	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)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)
 {
 	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";

 	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)
 		register_console(&atari_console_driver);

 	return 0;
 }

 early_param("debug", atari_debug_setup);
	/*
	* 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 (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
	MFPDELAY();
	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 0
	int 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 (!(scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
	MFPDELAY();
	return 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 { \
	scc.cha_b_ctrl = (reg); \
	MFPDELAY(); \
	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)
	{
	extern int atari_SCC_reset_done;
	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)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)
	{
	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";

	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)
	register_console(&atari_console_driver);

	return 0;
	}

	early_param("debug", atari_debug_setup);