v4.19.13 snapshot.
diff --git a/arch/m68k/atari/debug.c b/arch/m68k/atari/debug.c
new file mode 100644
index 0000000..03cb5e0
--- /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);