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debug.c

/*
 * 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 (!(mfp.trn_stat & 0x80))      /* wait for tx buf empty */
            barrier();
      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 ((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 (!(mfp.rcv_stat & 0x80))      /* wait for rx buf filled */
            barrier();
      return 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 */

      mfp.trn_stat &= ~0x01;        /* disable TX */
      mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
      mfp.tim_ct_cd &= 0x70;        /* stop timer D */
      mfp.tim_dt_d = baud_table[baud];
      mfp.tim_ct_cd |= 0x01;        /* start timer D, 1:4 */
      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);

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