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