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