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debug.c

/*
 * linux/arch/m68k/mac/debug.c
 *
 * Shamelessly stolen (SCC code and general framework) from:
 *
 * 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/sched.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/delay.h>

#define BOOTINFO_COMPAT_1_0
#include <asm/setup.h>
#include <asm/bootinfo.h>
#include <asm/macints.h>

extern unsigned long mac_videobase;
extern unsigned long mac_rowbytes;

extern void mac_serial_print(const char *);

#define DEBUG_HEADS
#undef DEBUG_SCREEN
#define DEBUG_SERIAL

/*
 * These two auxiliary debug functions should go away ASAP. Only usage:
 * before the console output is up (after head.S come some other crucial
 * setup routines :-) it permits writing 'data' to the screen as bit patterns
 * (good luck reading those). Helped to figure that the bootinfo contained
 * garbage data on the amount and size of memory chunks ...
 *
 * The 'pos' argument now simply means 'linefeed after print' ...
 */

#ifdef DEBUG_SCREEN
static int peng, line;
#endif

#if 0

void mac_debugging_short(int pos, short num)
{
#ifdef DEBUG_SCREEN
      unsigned char *pengoffset;
      unsigned char *pptr;
      int i;
#endif

#ifdef DEBUG_SERIAL
      printk("debug: %d !\n", num);
#endif

#ifdef DEBUG_SCREEN
      if (!MACH_IS_MAC) {
            /* printk("debug: %d !\n", num); */
            return;
      }

      /* calculate current offset */
      pengoffset = (unsigned char *)mac_videobase +
            (150+line*2) * mac_rowbytes + 80 * peng;

      pptr = pengoffset;

      for (i = 0; i < 8 * sizeof(short); i++) { /* # of bits */
            /*        value        mask for bit i, reverse order */
            *pptr++ = (num & (1 << (8*sizeof(short)-i-1)) ? 0xFF : 0x00);
      }

      peng++;

      if (pos) {
            line++;
            peng = 0;
      }
#endif
}

void mac_debugging_long(int pos, long addr)
{
#ifdef DEBUG_SCREEN
      unsigned char *pengoffset;
      unsigned char *pptr;
      int i;
#endif

#ifdef DEBUG_SERIAL
      printk("debug: #%ld !\n", addr);
#endif

#ifdef DEBUG_SCREEN
      if (!MACH_IS_MAC) {
            /* printk("debug: #%ld !\n", addr); */
            return;
      }

      pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
                +80*peng;

      pptr = pengoffset;

      for (i = 0; i < 8 * sizeof(long); i++) { /* # of bits */
            *pptr++ = (addr & (1 << (8*sizeof(long)-i-1)) ? 0xFF : 0x00);
      }

      peng++;

      if (pos) {
            line++;
            peng = 0;
      }
#endif
}

#endif  /*  0  */

#ifdef DEBUG_SERIAL
/*
 * TODO: serial debug code
 */

00135 struct mac_SCC {
      u_char cha_b_ctrl;
      u_char char_dummy1;
      u_char cha_a_ctrl;
      u_char char_dummy2;
      u_char cha_b_data;
      u_char char_dummy3;
      u_char cha_a_data;
};

# define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))

static int scc_port = -1;

static struct console mac_console_driver = {
      .name = "debug",
      .flags      = CON_PRINTBUFFER,
      .index      = -1,
};

/*
 * Crude hack to get console output to the screen before the framebuffer
 * is initialized (happens a lot later in 2.1!).
 * We just use the console routines declared in head.S, this will interfere
 * with regular framebuffer console output and should be used exclusively
 * to debug kernel problems manifesting before framebuffer init (aka WSOD)
 *
 * To keep this hack from interfering with the regular console driver, either
 * deregister this driver before/on framebuffer console init, or silence this
 * function after the fbcon driver is running (will lose console messages!?).
 * To debug real early bugs, need to write a 'mac_register_console_hack()'
 * that is called from start_kernel() before setup_arch() and just registers
 * this driver if Mac.
 */

static void mac_debug_console_write(struct console *co, const char *str,
                            unsigned int count)
{
      mac_serial_print(str);
}



/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/

#define uSEC 1

static inline void mac_sccb_out(char c)
{
      int i;

      do {
            for (i = uSEC; i > 0; --i)
                  barrier();
      } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
      for (i = uSEC; i > 0; --i)
            barrier();
      scc.cha_b_data = c;
}

static inline void mac_scca_out(char c)
{
      int i;

      do {
            for (i = uSEC; i > 0; --i)
                  barrier();
      } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
      for (i = uSEC; i > 0; --i)
            barrier();
      scc.cha_a_data = c;
}

static void mac_sccb_console_write(struct console *co, const char *str,
                           unsigned int count)
{
      while (count--) {
            if (*str == '\n')
                  mac_sccb_out('\r');
            mac_sccb_out(*str++);
      }
}

static void mac_scca_console_write(struct console *co, const char *str,
                           unsigned int count)
{
      while (count--) {
            if (*str == '\n')
                  mac_scca_out('\r');
            mac_scca_out(*str++);
      }
}


/* 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. */
#define SCCB_WRITE(reg,val)                     \
      do {                                \
            int i;                              \
            scc.cha_b_ctrl = (reg);             \
            for (i = uSEC; i > 0; --i)          \
                  barrier();              \
            scc.cha_b_ctrl = (val);             \
            for (i = uSEC; i > 0; --i)          \
                  barrier();              \
      } while(0)

#define SCCA_WRITE(reg,val)                     \
      do {                                \
            int i;                              \
            scc.cha_a_ctrl = (reg);             \
            for (i = uSEC; i > 0; --i)          \
                  barrier();              \
            scc.cha_a_ctrl = (val);             \
            for (i = uSEC; i > 0; --i)          \
                  barrier();              \
      } while(0)

/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
 * delay of ~ 60us. */
/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
#define LONG_DELAY()                            \
      do {                                \
            int i;                              \
            for (i = 60*uSEC; i > 0; --i)       \
                barrier();                      \
      } while(0)

static void __init mac_init_scc_port(int cflag, int port)
{
      /*
       * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
       */

      static int clksrc_table[9] =
            /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
            { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
      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) */
            { 94, 62, 46, 22, 10, 4, 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];

      reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
      reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;

      if (port == 1) {
            (void)scc.cha_b_ctrl;   /* reset reg pointer */
            SCCB_WRITE(9, 0xc0);    /* reset */
            LONG_DELAY();           /* extra delay after WR9 access */
            SCCB_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
                     0x04 /* 1 stopbit */ |
                     clkmode);
            SCCB_WRITE(3, reg3);
            SCCB_WRITE(5, reg5);
            SCCB_WRITE(9, 0); /* no interrupts */
            LONG_DELAY();           /* extra delay after WR9 access */
            SCCB_WRITE(10, 0);      /* NRZ mode */
            SCCB_WRITE(11, clksrc); /* main clock source */
            SCCB_WRITE(12, div);    /* BRG value */
            SCCB_WRITE(13, 0);      /* BRG high byte */
            SCCB_WRITE(14, 1);
            SCCB_WRITE(3, reg3 | 1);
            SCCB_WRITE(5, reg5 | 8);
      } else if (port == 0) {
            (void)scc.cha_a_ctrl;   /* reset reg pointer */
            SCCA_WRITE(9, 0xc0);    /* reset */
            LONG_DELAY();           /* extra delay after WR9 access */
            SCCA_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
                    0x04 /* 1 stopbit */ |
                    clkmode);
            SCCA_WRITE(3, reg3);
            SCCA_WRITE(5, reg5);
            SCCA_WRITE(9, 0); /* no interrupts */
            LONG_DELAY();           /* extra delay after WR9 access */
            SCCA_WRITE(10, 0);      /* NRZ mode */
            SCCA_WRITE(11, clksrc); /* main clock source */
            SCCA_WRITE(12, div);    /* BRG value */
            SCCA_WRITE(13, 0);      /* BRG high byte */
            SCCA_WRITE(14, 1);
            SCCA_WRITE(3, reg3 | 1);
            SCCA_WRITE(5, reg5 | 8);
      }
}
#endif /* DEBUG_SERIAL */

static int __init mac_debug_setup(char *arg)
{
      if (!MACH_IS_MAC)
            return 0;

#ifdef DEBUG_SERIAL
      if (!strcmp(arg, "ser") || !strcmp(arg, "ser1")) {
            /* Mac modem port */
            mac_init_scc_port(B9600|CS8, 0);
            mac_console_driver.write = mac_scca_console_write;
            scc_port = 0;
      } else if (!strcmp(arg, "ser2")) {
            /* Mac printer port */
            mac_init_scc_port(B9600|CS8, 1);
            mac_console_driver.write = mac_sccb_console_write;
            scc_port = 1;
      }
#endif
#ifdef DEBUG_HEADS
      if (!strcmp(arg, "scn") || !strcmp(arg, "con")) {
            /* display, using head.S console routines */
            mac_console_driver.write = mac_debug_console_write;
      }
#endif
      if (mac_console_driver.write)
            register_console(&mac_console_driver);
      return 0;
}

early_param("debug", mac_debug_setup);

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