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/config.h>
  14 #include <linux/types.h>
  15 #include <linux/tty.h>
  16 #include <linux/console.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19
  20 #include <asm/atarihw.h>
  21 #include <asm/atariints.h>
  22
  23 extern char m68k_debug_device[];
  24
  25 /* Flag that Modem1 port is already initialized and used */
  26 int atari_MFP_init_done;
  27 /* Flag that Modem1 port is already initialized and used */
  28 int atari_SCC_init_done;
  29 /* Can be set somewhere, if a SCC master reset has already be done and should
  30  * not be repeated; used by kgdb */
  31 int atari_SCC_reset_done;
  32
  33 static struct console atari_console_driver = {
  34         .name =         "debug",
  35         .flags =        CON_PRINTBUFFER,
  36         .index =        -1,
  37 };
  38
  39
  40 static inline void ata_mfp_out (char c)
  41 {
  42     while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */
  43         barrier ();
  44     mfp.usart_dta = c;
  45 }
  46
  47 void atari_mfp_console_write (struct console *co, const char *str,
  48                               unsigned int count)
  49 {
  50     while (count--) {
  51         if (*str == '\n')
  52             ata_mfp_out( '\r' );
  53         ata_mfp_out( *str++ );
  54     }
  55 }
  56
  57 static inline void ata_scc_out (char c)
  58 {
  59     do {
  60         MFPDELAY();
  61     } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
  62     MFPDELAY();
  63     scc.cha_b_data = c;
  64 }
  65
  66 void atari_scc_console_write (struct console *co, const char *str,
  67                               unsigned int count)
  68 {
  69     while (count--) {
  70         if (*str == '\n')
  71             ata_scc_out( '\r' );
  72         ata_scc_out( *str++ );
  73     }
  74 }
  75
  76 static inline void ata_midi_out (char c)
  77 {
  78     while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */
  79         barrier ();
  80     acia.mid_data = c;
  81 }
  82
  83 void atari_midi_console_write (struct console *co, const char *str,
  84                                unsigned int count)
  85 {
  86     while (count--) {
  87         if (*str == '\n')
  88             ata_midi_out( '\r' );
  89         ata_midi_out( *str++ );
  90     }
  91 }
  92
  93 static int ata_par_out (char c)
  94 {
  95     unsigned char tmp;
  96     /* This a some-seconds timeout in case no printer is connected */
  97     unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ;
  98
  99     while( (mfp.par_dt_reg & 1) && --i ) /* wait for BUSY == L */
 100         ;
 101     if (!i) return( 0 );
 102
 103     sound_ym.rd_data_reg_sel = 15;  /* select port B */
 104     sound_ym.wd_data = c;           /* put char onto port */
 105     sound_ym.rd_data_reg_sel = 14;  /* select port A */
 106     tmp = sound_ym.rd_data_reg_sel;
 107     sound_ym.wd_data = tmp & ~0x20; /* set strobe L */
 108     MFPDELAY();                     /* wait a bit */
 109     sound_ym.wd_data = tmp | 0x20;  /* set strobe H */
 110     return( 1 );
 111 }
 112
 113 static void atari_par_console_write (struct console *co, const char *str,
 114                                      unsigned int count)
 115 {
 116     static int printer_present = 1;
 117
 118     if (!printer_present)
 119         return;
 120
 121     while (count--) {
 122         if (*str == '\n')
 123             if (!ata_par_out( '\r' )) {
 124                 printer_present = 0;
 125                 return;
 126             }
 127         if (!ata_par_out( *str++ )) {
 128             printer_present = 0;
 129             return;
 130         }
 131     }
 132 }
 133
 134 #ifdef CONFIG_SERIAL_CONSOLE
 135 int atari_mfp_console_wait_key(struct console *co)
 136 {
 137     while( !(mfp.rcv_stat & 0x80) ) /* wait for rx buf filled */
 138         barrier();
 139     return( mfp.usart_dta );
 140 }
 141
 142 int atari_scc_console_wait_key(struct console *co)
 143 {
 144     do {
 145         MFPDELAY();
 146     } while( !(scc.cha_b_ctrl & 0x01) ); /* wait for rx buf filled */
 147     MFPDELAY();
 148     return( scc.cha_b_data );
 149 }
 150
 151 int atari_midi_console_wait_key(struct console *co)
 152 {
 153     while( !(acia.mid_ctrl & ACIA_RDRF) ) /* wait for rx buf filled */
 154         barrier();
 155     return( acia.mid_data );
 156 }
 157 #endif
 158
 159 /* The following two functions do a quick'n'dirty initialization of the MFP or
 160  * SCC serial ports. They're used by the debugging interface, kgdb, and the
 161  * serial console code. */
 162 #ifndef CONFIG_SERIAL_CONSOLE
 163 static void __init atari_init_mfp_port( int cflag )
 164 #else
 165 void atari_init_mfp_port( int cflag )
 166 #endif
 167 {
 168     /* timer values for 1200...115200 bps; > 38400 select 110, 134, or 150
 169      * bps, resp., and work only correct if there's a RSVE or RSSPEED */
 170     static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };
 171     int baud = cflag & CBAUD;
 172     int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;
 173     int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00;
 174
 175     if (cflag & CBAUDEX)
 176         baud += B38400;
 177     if (baud < B1200 || baud > B38400+2)
 178         baud = B9600; /* use default 9600bps for non-implemented rates */
 179     baud -= B1200; /* baud_table[] starts at 1200bps */
 180
 181     mfp.trn_stat &= ~0x01; /* disable TX */
 182     mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
 183     mfp.tim_ct_cd &= 0x70;  /* stop timer D */
 184     mfp.tim_dt_d = baud_table[baud];
 185     mfp.tim_ct_cd |= 0x01;  /* start timer D, 1:4 */
 186     mfp.trn_stat |= 0x01;  /* enable TX */
 187
 188     atari_MFP_init_done = 1;
 189 }
 190
 191 #define SCC_WRITE(reg,val)                              \
 192     do {                                                \
 193         scc.cha_b_ctrl = (reg);                         \
 194         MFPDELAY();                                     \
 195         scc.cha_b_ctrl = (val);                         \
 196         MFPDELAY();                                     \
 197     } while(0)
 198
 199 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
 200  * delay of ~ 60us. */
 201 #define LONG_DELAY()                            \
 202     do {                                        \
 203         int i;                                  \
 204         for( i = 100; i > 0; --i )              \
 205             MFPDELAY();                         \
 206     } while(0)
 207
 208 #ifndef CONFIG_SERIAL_CONSOLE
 209 static void __init atari_init_scc_port( int cflag )
 210 #else
 211 void atari_init_scc_port( int cflag )
 212 #endif
 213 {
 214     extern int atari_SCC_reset_done;
 215     static int clksrc_table[9] =
 216         /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
 217         { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
 218     static int brgsrc_table[9] =
 219         /* reg 14: 0 = RTxC, 2 = PCLK */
 220         { 2, 2, 2, 2, 2, 2, 0, 2, 2 };
 221     static int clkmode_table[9] =
 222         /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
 223         { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
 224     static int div_table[9] =
 225         /* reg12 (BRG low) */
 226         { 208, 138, 103, 50, 24, 11, 1, 0, 0 };
 227
 228     int baud = cflag & CBAUD;
 229     int clksrc, clkmode, div, reg3, reg5;
 230
 231     if (cflag & CBAUDEX)
 232         baud += B38400;
 233     if (baud < B1200 || baud > B38400+2)
 234         baud = B9600; /* use default 9600bps for non-implemented rates */
 235     baud -= B1200; /* tables starts at 1200bps */
 236
 237     clksrc  = clksrc_table[baud];
 238     clkmode = clkmode_table[baud];
 239     div     = div_table[baud];
 240     if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {
 241         /* special treatment for TT, where rates >= 38400 are done via TRxC */
 242         clksrc = 0x28; /* TRxC */
 243         clkmode = baud == 6 ? 0xc0 :
 244                   baud == 7 ? 0x80 : /* really 76800bps */
 245                               0x40;  /* really 153600bps */
 246         div = 0;
 247     }
 248
 249     reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
 250     reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
 251
 252     (void)scc.cha_b_ctrl;       /* reset reg pointer */
 253     SCC_WRITE( 9, 0xc0 );       /* reset */
 254     LONG_DELAY();               /* extra delay after WR9 access */
 255     SCC_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
 256                   0x04 /* 1 stopbit */ |
 257                   clkmode );
 258     SCC_WRITE( 3, reg3 );
 259     SCC_WRITE( 5, reg5 );
 260     SCC_WRITE( 9, 0 );          /* no interrupts */
 261     LONG_DELAY();               /* extra delay after WR9 access */
 262     SCC_WRITE( 10, 0 );         /* NRZ mode */
 263     SCC_WRITE( 11, clksrc );    /* main clock source */
 264     SCC_WRITE( 12, div );       /* BRG value */
 265     SCC_WRITE( 13, 0 );         /* BRG high byte */
 266     SCC_WRITE( 14, brgsrc_table[baud] );
 267     SCC_WRITE( 14, brgsrc_table[baud] | (div ? 1 : 0) );
 268     SCC_WRITE( 3, reg3 | 1 );
 269     SCC_WRITE( 5, reg5 | 8 );
 270
 271     atari_SCC_reset_done = 1;
 272     atari_SCC_init_done = 1;
 273 }
 274
 275 #ifndef CONFIG_SERIAL_CONSOLE
 276 static void __init atari_init_midi_port( int cflag )
 277 #else
 278 void atari_init_midi_port( int cflag )
 279 #endif
 280 {
 281     int baud = cflag & CBAUD;
 282     int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;
 283     /* warning 7N1 isn't possible! (instead 7O2 is used...) */
 284     int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;
 285     int div;
 286
 287     /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
 288      * default) the standard MIDI speed 31250. */
 289     if (cflag & CBAUDEX)
 290         baud += B38400;
 291     if (baud == B4800)
 292         div = ACIA_DIV64; /* really 7812.5 bps */
 293     else if (baud == B38400+2 /* 115200 */)
 294         div = ACIA_DIV1; /* really 500 kbps (does that work??) */
 295     else
 296         div = ACIA_DIV16; /* 31250 bps, standard for MIDI */
 297
 298     /* RTS low, ints disabled */
 299     acia.mid_ctrl = div | csize | parity |
 300                     ((atari_switches & ATARI_SWITCH_MIDI) ?
 301                      ACIA_RHTID : ACIA_RLTID);
 302 }
 303
 304 void __init atari_debug_init(void)
 305 {
 306     if (!strcmp( m68k_debug_device, "ser" )) {
 307         /* defaults to ser2 for a Falcon and ser1 otherwise */
 308         strcpy( m68k_debug_device, MACH_IS_FALCON ? "ser2" : "ser1" );
 309
 310     }
 311
 312     if (!strcmp( m68k_debug_device, "ser1" )) {
 313         /* ST-MFP Modem1 serial port */
 314         atari_init_mfp_port( B9600|CS8 );
 315         atari_console_driver.write = atari_mfp_console_write;
 316     }
 317     else if (!strcmp( m68k_debug_device, "ser2" )) {
 318         /* SCC Modem2 serial port */
 319         atari_init_scc_port( B9600|CS8 );
 320         atari_console_driver.write = atari_scc_console_write;
 321     }
 322     else if (!strcmp( m68k_debug_device, "midi" )) {
 323         /* MIDI port */
 324         atari_init_midi_port( B9600|CS8 );
 325         atari_console_driver.write = atari_midi_console_write;
 326     }
 327     else if (!strcmp( m68k_debug_device, "par" )) {
 328         /* parallel printer */
 329         atari_turnoff_irq( IRQ_MFP_BUSY ); /* avoid ints */
 330         sound_ym.rd_data_reg_sel = 7;  /* select mixer control */
 331         sound_ym.wd_data = 0xff;       /* sound off, ports are output */
 332         sound_ym.rd_data_reg_sel = 15; /* select port B */
 333         sound_ym.wd_data = 0;          /* no char */
 334         sound_ym.rd_data_reg_sel = 14; /* select port A */
 335         sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */
 336         atari_console_driver.write = atari_par_console_write;
 337     }
 338     if (atari_console_driver.write)
 339         register_console(&atari_console_driver);
 340 }
 341
 342 /*
 343  * Local variables:
 344  *  c-indent-level: 4
 345  *  tab-width: 8
 346  * End:
 347  */