Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 329 insertions, 0 deletions

diff --git a/arch/m68k/atari/debug.c b/arch/m68k/atari/debug.c
new file mode 100644
index 000000000..03cb5e08d
--- /dev/null
+++ b/arch/m68k/atari/debug.c
@@ -0,0 +1,329 @@
+/*
+ * 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 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 (!(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);