arch/m68k/atari/debug.c

   1 /*
   2  * linux/arch/m68k/atari/debug.c
   3  *
   4  * Atari debugging and serial console stuff
   5  *
   6  * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/tty.h>
  15 #include <linux/console.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18
  19 #include <asm/atarihw.h>
  20 #include <asm/atariints.h>
  21
  22 extern char m68k_debug_device[];
  23
  24 /* Flag that Modem1 port is already initialized and used */
  25 int atari_MFP_init_done;
  26 /* Flag that Modem1 port is already initialized and used */
  27 int atari_SCC_init_done;
  28 /* Can be set somewhere, if a SCC master reset has already be done and should
  29  * not be repeated; used by kgdb */
  30 int atari_SCC_reset_done;
  31
  32 static struct console atari_console_driver = {
  33         .name =         "debug",
  34         .flags =        CON_PRINTBUFFER,
  35         .index =        -1,
  36 };
  37
  38
  39 static inline void ata_mfp_out (char c)
  40 {
  41     while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */
  42         barrier ();
  43     mfp.usart_dta = c;
  44 }
  45
  46 void atari_mfp_console_write (struct console *co, const char *str,
  47                               unsigned int count)
  48 {
  49     while (count--) {
  50         if (*str == '\n')
  51             ata_mfp_out( '\r' );
  52         ata_mfp_out( *str++ );
  53     }
  54 }
  55
  56 static inline void ata_scc_out (char c)
  57 {
  58     do {
  59         MFPDELAY();
  60     } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
  61     MFPDELAY();
  62     scc.cha_b_data = c;
  63 }
  64
  65 void atari_scc_console_write (struct console *co, const char *str,
  66                               unsigned int count)
  67 {
  68     while (count--) {
  69         if (*str == '\n')
  70             ata_scc_out( '\r' );
  71         ata_scc_out( *str++ );
  72     }
  73 }
  74
  75 static inline void ata_midi_out (char c)
  76 {
  77     while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */
  78         barrier ();
  79     acia.mid_data = c;
  80 }
  81
  82 void atari_midi_console_write (struct console *co, const char *str,
  83                                unsigned int count)
  84 {
  85     while (count--) {
  86         if (*str == '\n')
  87             ata_midi_out( '\r' );
  88         ata_midi_out( *str++ );
  89     }
  90 }
  91
  92 static int ata_par_out (char c)
  93 {
  94     unsigned char tmp;
  95     /* This a some-seconds timeout in case no printer is connected */
  96     unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ;
  97
  98     while( (mfp.par_dt_reg & 1) && --i ) /* wait for BUSY == L */
  99         ;
 100     if (!i) return( 0 );
 101
 102     sound_ym.rd_data_reg_sel = 15;  /* select port B */
 103     sound_ym.wd_data = c;           /* put char onto port */
 104     sound_ym.rd_data_reg_sel = 14;  /* select port A */
 105     tmp = sound_ym.rd_data_reg_sel;
 106     sound_ym.wd_data = tmp & ~0x20; /* set strobe L */
 107     MFPDELAY();                     /* wait a bit */
 108     sound_ym.wd_data = tmp | 0x20;  /* set strobe H */
 109     return( 1 );
 110 }
 111
 112 static void atari_par_console_write (struct console *co, const char *str,
 113                                      unsigned int count)
 114 {
 115     static int printer_present = 1;
 116
 117     if (!printer_present)
 118         return;
 119
 120     while (count--) {
 121         if (*str == '\n')
 122             if (!ata_par_out( '\r' )) {
 123                 printer_present = 0;
 124                 return;
 125             }
 126         if (!ata_par_out( *str++ )) {
 127             printer_present = 0;
 128             return;
 129         }
 130     }
 131 }
 132
 133 #ifdef CONFIG_SERIAL_CONSOLE
 134 int atari_mfp_console_wait_key(struct console *co)
 135 {
 136     while( !(mfp.rcv_stat & 0x80) ) /* wait for rx buf filled */
 137         barrier();
 138     return( mfp.usart_dta );
 139 }
 140
 141 int atari_scc_console_wait_key(struct console *co)
 142 {
 143     do {
 144         MFPDELAY();
 145     } while( !(scc.cha_b_ctrl & 0x01) ); /* wait for rx buf filled */
 146     MFPDELAY();
 147     return( scc.cha_b_data );
 148 }
 149
 150 int atari_midi_console_wait_key(struct console *co)
 151 {
 152     while( !(acia.mid_ctrl & ACIA_RDRF) ) /* wait for rx buf filled */
 153         barrier();
 154     return( acia.mid_data );
 155 }
 156 #endif
 157
 158 /* The following two functions do a quick'n'dirty initialization of the MFP or
 159  * SCC serial ports. They're used by the debugging interface, kgdb, and the
 160  * serial console code. */
 161 #ifndef CONFIG_SERIAL_CONSOLE
 162 static void __init atari_init_mfp_port( int cflag )
 163 #else
 164 void atari_init_mfp_port( int cflag )
 165 #endif
 166 {
 167     /* timer values for 1200...115200 bps; > 38400 select 110, 134, or 150
 168      * bps, resp., and work only correct if there's a RSVE or RSSPEED */
 169     static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };
 170     int baud = cflag & CBAUD;
 171     int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;
 172     int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00;
 173
 174     if (cflag & CBAUDEX)
 175         baud += B38400;
 176     if (baud < B1200 || baud > B38400+2)
 177         baud = B9600; /* use default 9600bps for non-implemented rates */
 178     baud -= B1200; /* baud_table[] starts at 1200bps */
 179
 180     mfp.trn_stat &= ~0x01; /* disable TX */
 181     mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
 182     mfp.tim_ct_cd &= 0x70;  /* stop timer D */
 183     mfp.tim_dt_d = baud_table[baud];
 184     mfp.tim_ct_cd |= 0x01;  /* start timer D, 1:4 */
 185     mfp.trn_stat |= 0x01;  /* enable TX */
 186
 187     atari_MFP_init_done = 1;
 188 }
 189
 190 #define SCC_WRITE(reg,val)                              \
 191     do {                                                \
 192         scc.cha_b_ctrl = (reg);                         \
 193         MFPDELAY();                                     \
 194         scc.cha_b_ctrl = (val);                         \
 195         MFPDELAY();                                     \
 196     } while(0)
 197
 198 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
 199  * delay of ~ 60us. */
 200 #define LONG_DELAY()                            \
 201     do {                                        \
 202         int i;                                  \
 203         for( i = 100; i > 0; --i )              \
 204             MFPDELAY();                         \
 205     } while(0)
 206
 207 #ifndef CONFIG_SERIAL_CONSOLE
 208 static void __init atari_init_scc_port( int cflag )
 209 #else
 210 void atari_init_scc_port( int cflag )
 211 #endif
 212 {
 213     extern int atari_SCC_reset_done;
 214     static int clksrc_table[9] =
 215         /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
 216         { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
 217     static int brgsrc_table[9] =
 218         /* reg 14: 0 = RTxC, 2 = PCLK */
 219         { 2, 2, 2, 2, 2, 2, 0, 2, 2 };
 220     static int clkmode_table[9] =
 221         /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
 222         { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
 223     static int div_table[9] =
 224         /* reg12 (BRG low) */
 225         { 208, 138, 103, 50, 24, 11, 1, 0, 0 };
 226
 227     int baud = cflag & CBAUD;
 228     int clksrc, clkmode, div, reg3, reg5;
 229
 230     if (cflag & CBAUDEX)
 231         baud += B38400;
 232     if (baud < B1200 || baud > B38400+2)
 233         baud = B9600; /* use default 9600bps for non-implemented rates */
 234     baud -= B1200; /* tables starts at 1200bps */
 235
 236     clksrc  = clksrc_table[baud];
 237     clkmode = clkmode_table[baud];
 238     div     = div_table[baud];
 239     if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {
 240         /* special treatment for TT, where rates >= 38400 are done via TRxC */
 241         clksrc = 0x28; /* TRxC */
 242         clkmode = baud == 6 ? 0xc0 :
 243                   baud == 7 ? 0x80 : /* really 76800bps */
 244                               0x40;  /* really 153600bps */
 245         div = 0;
 246     }
 247
 248     reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
 249     reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
 250
 251     (void)scc.cha_b_ctrl;       /* reset reg pointer */
 252     SCC_WRITE( 9, 0xc0 );       /* reset */
 253     LONG_DELAY();               /* extra delay after WR9 access */
 254     SCC_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
 255                   0x04 /* 1 stopbit */ |
 256                   clkmode );
 257     SCC_WRITE( 3, reg3 );
 258     SCC_WRITE( 5, reg5 );
 259     SCC_WRITE( 9, 0 );          /* no interrupts */
 260     LONG_DELAY();               /* extra delay after WR9 access */
 261     SCC_WRITE( 10, 0 );         /* NRZ mode */
 262     SCC_WRITE( 11, clksrc );    /* main clock source */
 263     SCC_WRITE( 12, div );       /* BRG value */
 264     SCC_WRITE( 13, 0 );         /* BRG high byte */
 265     SCC_WRITE( 14, brgsrc_table[baud] );
 266     SCC_WRITE( 14, brgsrc_table[baud] | (div ? 1 : 0) );
 267     SCC_WRITE( 3, reg3 | 1 );
 268     SCC_WRITE( 5, reg5 | 8 );
 269
 270     atari_SCC_reset_done = 1;
 271     atari_SCC_init_done = 1;
 272 }
 273
 274 #ifndef CONFIG_SERIAL_CONSOLE
 275 static void __init atari_init_midi_port( int cflag )
 276 #else
 277 void atari_init_midi_port( int cflag )
 278 #endif
 279 {
 280     int baud = cflag & CBAUD;
 281     int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;
 282     /* warning 7N1 isn't possible! (instead 7O2 is used...) */
 283     int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;
 284     int div;
 285
 286     /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
 287      * default) the standard MIDI speed 31250. */
 288     if (cflag & CBAUDEX)
 289         baud += B38400;
 290     if (baud == B4800)
 291         div = ACIA_DIV64; /* really 7812.5 bps */
 292     else if (baud == B38400+2 /* 115200 */)
 293         div = ACIA_DIV1; /* really 500 kbps (does that work??) */
 294     else
 295         div = ACIA_DIV16; /* 31250 bps, standard for MIDI */
 296
 297     /* RTS low, ints disabled */
 298     acia.mid_ctrl = div | csize | parity |
 299                     ((atari_switches & ATARI_SWITCH_MIDI) ?
 300                      ACIA_RHTID : ACIA_RLTID);
 301 }
 302
 303 void __init atari_debug_init(void)
 304 {
 305     if (!strcmp( m68k_debug_device, "ser" )) {
 306         /* defaults to ser2 for a Falcon and ser1 otherwise */
 307         strcpy( m68k_debug_device, MACH_IS_FALCON ? "ser2" : "ser1" );
 308
 309     }
 310
 311     if (!strcmp( m68k_debug_device, "ser1" )) {
 312         /* ST-MFP Modem1 serial port */
 313         atari_init_mfp_port( B9600|CS8 );
 314         atari_console_driver.write = atari_mfp_console_write;
 315     }
 316     else if (!strcmp( m68k_debug_device, "ser2" )) {
 317         /* SCC Modem2 serial port */
 318         atari_init_scc_port( B9600|CS8 );
 319         atari_console_driver.write = atari_scc_console_write;
 320     }
 321     else if (!strcmp( m68k_debug_device, "midi" )) {
 322         /* MIDI port */
 323         atari_init_midi_port( B9600|CS8 );
 324         atari_console_driver.write = atari_midi_console_write;
 325     }
 326     else if (!strcmp( m68k_debug_device, "par" )) {
 327         /* parallel printer */
 328         atari_turnoff_irq( IRQ_MFP_BUSY ); /* avoid ints */
 329         sound_ym.rd_data_reg_sel = 7;  /* select mixer control */
 330         sound_ym.wd_data = 0xff;       /* sound off, ports are output */
 331         sound_ym.rd_data_reg_sel = 15; /* select port B */
 332         sound_ym.wd_data = 0;          /* no char */
 333         sound_ym.rd_data_reg_sel = 14; /* select port A */
 334         sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */
 335         atari_console_driver.write = atari_par_console_write;
 336     }
 337     if (atari_console_driver.write)
 338         register_console(&atari_console_driver);
 339 }
 340
 341 /*
 342  * Local variables:
 343  *  c-indent-level: 4
 344  *  tab-width: 8
 345  * End:
 346  */