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 #include <linux/module.h> 19 20 #include <asm/atarihw.h> 21 #include <asm/atariints.h> 22 23 /* Flag that Modem1 port is already initialized and used */ 24 int atari_MFP_init_done; 25 EXPORT_SYMBOL(atari_MFP_init_done); 26 27 /* Flag that Modem1 port is already initialized and used */ 28 int atari_SCC_init_done; 29 EXPORT_SYMBOL(atari_SCC_init_done); 30 31 /* Can be set somewhere, if a SCC master reset has already be done and should 32 * not be repeated; used by kgdb */ 33 int atari_SCC_reset_done; 34 EXPORT_SYMBOL(atari_SCC_reset_done); 35 36 static struct console atari_console_driver = { 37 .name = "debug", 38 .flags = CON_PRINTBUFFER, 39 .index = -1, 40 }; 41 42 43 static inline void ata_mfp_out(char c) 44 { 45 while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */ 46 barrier(); 47 mfp.usart_dta = c; 48 } 49 50 void atari_mfp_console_write(struct console *co, const char *str, 51 unsigned int count) 52 { 53 while (count--) { 54 if (*str == '\n') 55 ata_mfp_out('\r'); 56 ata_mfp_out(*str++); 57 } 58 } 59 60 static inline void ata_scc_out(char c) 61 { 62 do { 63 MFPDELAY(); 64 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */ 65 MFPDELAY(); 66 scc.cha_b_data = c; 67 } 68 69 void atari_scc_console_write(struct console *co, const char *str, 70 unsigned int count) 71 { 72 while (count--) { 73 if (*str == '\n') 74 ata_scc_out('\r'); 75 ata_scc_out(*str++); 76 } 77 } 78 79 static inline void ata_midi_out(char c) 80 { 81 while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */ 82 barrier(); 83 acia.mid_data = c; 84 } 85 86 void atari_midi_console_write(struct console *co, const char *str, 87 unsigned int count) 88 { 89 while (count--) { 90 if (*str == '\n') 91 ata_midi_out('\r'); 92 ata_midi_out(*str++); 93 } 94 } 95 96 static int ata_par_out(char c) 97 { 98 unsigned char tmp; 99 /* This a some-seconds timeout in case no printer is connected */ 100 unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ; 101 102 while ((mfp.par_dt_reg & 1) && --i) /* wait for BUSY == L */ 103 ; 104 if (!i) 105 return 0; 106 107 sound_ym.rd_data_reg_sel = 15; /* select port B */ 108 sound_ym.wd_data = c; /* put char onto port */ 109 sound_ym.rd_data_reg_sel = 14; /* select port A */ 110 tmp = sound_ym.rd_data_reg_sel; 111 sound_ym.wd_data = tmp & ~0x20; /* set strobe L */ 112 MFPDELAY(); /* wait a bit */ 113 sound_ym.wd_data = tmp | 0x20; /* set strobe H */ 114 return 1; 115 } 116 117 static void atari_par_console_write(struct console *co, const char *str, 118 unsigned int count) 119 { 120 static int printer_present = 1; 121 122 if (!printer_present) 123 return; 124 125 while (count--) { 126 if (*str == '\n') { 127 if (!ata_par_out('\r')) { 128 printer_present = 0; 129 return; 130 } 131 } 132 if (!ata_par_out(*str++)) { 133 printer_present = 0; 134 return; 135 } 136 } 137 } 138 139 #ifdef CONFIG_SERIAL_CONSOLE 140 int atari_mfp_console_wait_key(struct console *co) 141 { 142 while (!(mfp.rcv_stat & 0x80)) /* wait for rx buf filled */ 143 barrier(); 144 return mfp.usart_dta; 145 } 146 147 int atari_scc_console_wait_key(struct console *co) 148 { 149 do { 150 MFPDELAY(); 151 } while (!(scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */ 152 MFPDELAY(); 153 return scc.cha_b_data; 154 } 155 156 int atari_midi_console_wait_key(struct console *co) 157 { 158 while (!(acia.mid_ctrl & ACIA_RDRF)) /* wait for rx buf filled */ 159 barrier(); 160 return acia.mid_data; 161 } 162 #endif 163 164 /* 165 * The following two functions do a quick'n'dirty initialization of the MFP or 166 * SCC serial ports. They're used by the debugging interface, kgdb, and the 167 * serial console code. 168 */ 169 #ifndef CONFIG_SERIAL_CONSOLE 170 static void __init atari_init_mfp_port(int cflag) 171 #else 172 void atari_init_mfp_port(int cflag) 173 #endif 174 { 175 /* 176 * timer values for 1200...115200 bps; > 38400 select 110, 134, or 150 177 * bps, resp., and work only correct if there's a RSVE or RSSPEED 178 */ 179 static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 }; 180 int baud = cflag & CBAUD; 181 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0; 182 int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00; 183 184 if (cflag & CBAUDEX) 185 baud += B38400; 186 if (baud < B1200 || baud > B38400+2) 187 baud = B9600; /* use default 9600bps for non-implemented rates */ 188 baud -= B1200; /* baud_table[] starts at 1200bps */ 189 190 mfp.trn_stat &= ~0x01; /* disable TX */ 191 mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */ 192 mfp.tim_ct_cd &= 0x70; /* stop timer D */ 193 mfp.tim_dt_d = baud_table[baud]; 194 mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */ 195 mfp.trn_stat |= 0x01; /* enable TX */ 196 197 atari_MFP_init_done = 1; 198 } 199 200 #define SCC_WRITE(reg, val) \ 201 do { \ 202 scc.cha_b_ctrl = (reg); \ 203 MFPDELAY(); \ 204 scc.cha_b_ctrl = (val); \ 205 MFPDELAY(); \ 206 } while (0) 207 208 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a 209 * delay of ~ 60us. */ 210 #define LONG_DELAY() \ 211 do { \ 212 int i; \ 213 for (i = 100; i > 0; --i) \ 214 MFPDELAY(); \ 215 } while (0) 216 217 #ifndef CONFIG_SERIAL_CONSOLE 218 static void __init atari_init_scc_port(int cflag) 219 #else 220 void atari_init_scc_port(int cflag) 221 #endif 222 { 223 extern int atari_SCC_reset_done; 224 static int clksrc_table[9] = 225 /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */ 226 { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 }; 227 static int brgsrc_table[9] = 228 /* reg 14: 0 = RTxC, 2 = PCLK */ 229 { 2, 2, 2, 2, 2, 2, 0, 2, 2 }; 230 static int clkmode_table[9] = 231 /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */ 232 { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 }; 233 static int div_table[9] = 234 /* reg12 (BRG low) */ 235 { 208, 138, 103, 50, 24, 11, 1, 0, 0 }; 236 237 int baud = cflag & CBAUD; 238 int clksrc, clkmode, div, reg3, reg5; 239 240 if (cflag & CBAUDEX) 241 baud += B38400; 242 if (baud < B1200 || baud > B38400+2) 243 baud = B9600; /* use default 9600bps for non-implemented rates */ 244 baud -= B1200; /* tables starts at 1200bps */ 245 246 clksrc = clksrc_table[baud]; 247 clkmode = clkmode_table[baud]; 248 div = div_table[baud]; 249 if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) { 250 /* special treatment for TT, where rates >= 38400 are done via TRxC */ 251 clksrc = 0x28; /* TRxC */ 252 clkmode = baud == 6 ? 0xc0 : 253 baud == 7 ? 0x80 : /* really 76800bps */ 254 0x40; /* really 153600bps */ 255 div = 0; 256 } 257 258 reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40; 259 reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */; 260 261 (void)scc.cha_b_ctrl; /* reset reg pointer */ 262 SCC_WRITE(9, 0xc0); /* reset */ 263 LONG_DELAY(); /* extra delay after WR9 access */ 264 SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) 265 : 0 | 0x04 /* 1 stopbit */ | clkmode); 266 SCC_WRITE(3, reg3); 267 SCC_WRITE(5, reg5); 268 SCC_WRITE(9, 0); /* no interrupts */ 269 LONG_DELAY(); /* extra delay after WR9 access */ 270 SCC_WRITE(10, 0); /* NRZ mode */ 271 SCC_WRITE(11, clksrc); /* main clock source */ 272 SCC_WRITE(12, div); /* BRG value */ 273 SCC_WRITE(13, 0); /* BRG high byte */ 274 SCC_WRITE(14, brgsrc_table[baud]); 275 SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0)); 276 SCC_WRITE(3, reg3 | 1); 277 SCC_WRITE(5, reg5 | 8); 278 279 atari_SCC_reset_done = 1; 280 atari_SCC_init_done = 1; 281 } 282 283 #ifndef CONFIG_SERIAL_CONSOLE 284 static void __init atari_init_midi_port(int cflag) 285 #else 286 void atari_init_midi_port(int cflag) 287 #endif 288 { 289 int baud = cflag & CBAUD; 290 int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00; 291 /* warning 7N1 isn't possible! (instead 7O2 is used...) */ 292 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04; 293 int div; 294 295 /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as 296 * default) the standard MIDI speed 31250. */ 297 if (cflag & CBAUDEX) 298 baud += B38400; 299 if (baud == B4800) 300 div = ACIA_DIV64; /* really 7812.5 bps */ 301 else if (baud == B38400+2 /* 115200 */) 302 div = ACIA_DIV1; /* really 500 kbps (does that work??) */ 303 else 304 div = ACIA_DIV16; /* 31250 bps, standard for MIDI */ 305 306 /* RTS low, ints disabled */ 307 acia.mid_ctrl = div | csize | parity | 308 ((atari_switches & ATARI_SWITCH_MIDI) ? 309 ACIA_RHTID : ACIA_RLTID); 310 } 311 312 static int __init atari_debug_setup(char *arg) 313 { 314 if (!MACH_IS_ATARI) 315 return 0; 316 317 if (!strcmp(arg, "ser")) 318 /* defaults to ser2 for a Falcon and ser1 otherwise */ 319 arg = MACH_IS_FALCON ? "ser2" : "ser1"; 320 321 if (!strcmp(arg, "ser1")) { 322 /* ST-MFP Modem1 serial port */ 323 atari_init_mfp_port(B9600|CS8); 324 atari_console_driver.write = atari_mfp_console_write; 325 } else if (!strcmp(arg, "ser2")) { 326 /* SCC Modem2 serial port */ 327 atari_init_scc_port(B9600|CS8); 328 atari_console_driver.write = atari_scc_console_write; 329 } else if (!strcmp(arg, "midi")) { 330 /* MIDI port */ 331 atari_init_midi_port(B9600|CS8); 332 atari_console_driver.write = atari_midi_console_write; 333 } else if (!strcmp(arg, "par")) { 334 /* parallel printer */ 335 atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */ 336 sound_ym.rd_data_reg_sel = 7; /* select mixer control */ 337 sound_ym.wd_data = 0xff; /* sound off, ports are output */ 338 sound_ym.rd_data_reg_sel = 15; /* select port B */ 339 sound_ym.wd_data = 0; /* no char */ 340 sound_ym.rd_data_reg_sel = 14; /* select port A */ 341 sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */ 342 atari_console_driver.write = atari_par_console_write; 343 } 344 if (atari_console_driver.write) 345 register_console(&atari_console_driver); 346 347 return 0; 348 } 349 350 early_param("debug", atari_debug_setup); 351