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 */ 347