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 */ 25int atari_SCC_reset_done; 26EXPORT_SYMBOL(atari_SCC_reset_done); 27 28static struct console atari_console_driver = { 29 .name = "debug", 30 .flags = CON_PRINTBUFFER, 31 .index = -1, 32}; 33 34 35static 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 42static 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 52static inline void ata_scc_out(char c) 53{ 54 do { 55 MFPDELAY(); 56 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */ 57 MFPDELAY(); 58 scc.cha_b_data = c; 59} 60 61static 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 71static 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 78static 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 88static 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 109static 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} 130 131 132/* 133 * The following two functions do a quick'n'dirty initialization of the MFP or 134 * SCC serial ports. They're used by the debugging interface, kgdb, and the 135 * serial console code. 136 */ 137static void __init atari_init_mfp_port(int cflag) 138{ 139 /* 140 * timer values for 1200...115200 bps; > 38400 select 110, 134, or 150 141 * bps, resp., and work only correct if there's a RSVE or RSSPEED 142 */ 143 static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 }; 144 int baud = cflag & CBAUD; 145 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0; 146 int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00; 147 148 if (cflag & CBAUDEX) 149 baud += B38400; 150 if (baud < B1200 || baud > B38400+2) 151 baud = B9600; /* use default 9600bps for non-implemented rates */ 152 baud -= B1200; /* baud_table[] starts at 1200bps */ 153 154 st_mfp.trn_stat &= ~0x01; /* disable TX */ 155 st_mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */ 156 st_mfp.tim_ct_cd &= 0x70; /* stop timer D */ 157 st_mfp.tim_dt_d = baud_table[baud]; 158 st_mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */ 159 st_mfp.trn_stat |= 0x01; /* enable TX */ 160} 161 162#define SCC_WRITE(reg, val) \ 163 do { \ 164 scc.cha_b_ctrl = (reg); \ 165 MFPDELAY(); \ 166 scc.cha_b_ctrl = (val); \ 167 MFPDELAY(); \ 168 } while (0) 169 170/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a 171 * delay of ~ 60us. */ 172#define LONG_DELAY() \ 173 do { \ 174 int i; \ 175 for (i = 100; i > 0; --i) \ 176 MFPDELAY(); \ 177 } while (0) 178 179static void __init atari_init_scc_port(int cflag) 180{ 181 extern int atari_SCC_reset_done; 182 static int clksrc_table[9] = 183 /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */ 184 { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 }; 185 static int brgsrc_table[9] = 186 /* reg 14: 0 = RTxC, 2 = PCLK */ 187 { 2, 2, 2, 2, 2, 2, 0, 2, 2 }; 188 static int clkmode_table[9] = 189 /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */ 190 { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 }; 191 static int div_table[9] = 192 /* reg12 (BRG low) */ 193 { 208, 138, 103, 50, 24, 11, 1, 0, 0 }; 194 195 int baud = cflag & CBAUD; 196 int clksrc, clkmode, div, reg3, reg5; 197 198 if (cflag & CBAUDEX) 199 baud += B38400; 200 if (baud < B1200 || baud > B38400+2) 201 baud = B9600; /* use default 9600bps for non-implemented rates */ 202 baud -= B1200; /* tables starts at 1200bps */ 203 204 clksrc = clksrc_table[baud]; 205 clkmode = clkmode_table[baud]; 206 div = div_table[baud]; 207 if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) { 208 /* special treatment for TT, where rates >= 38400 are done via TRxC */ 209 clksrc = 0x28; /* TRxC */ 210 clkmode = baud == 6 ? 0xc0 : 211 baud == 7 ? 0x80 : /* really 76800bps */ 212 0x40; /* really 153600bps */ 213 div = 0; 214 } 215 216 reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40; 217 reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */; 218 219 (void)scc.cha_b_ctrl; /* reset reg pointer */ 220 SCC_WRITE(9, 0xc0); /* reset */ 221 LONG_DELAY(); /* extra delay after WR9 access */ 222 SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) 223 : 0 | 0x04 /* 1 stopbit */ | clkmode); 224 SCC_WRITE(3, reg3); 225 SCC_WRITE(5, reg5); 226 SCC_WRITE(9, 0); /* no interrupts */ 227 LONG_DELAY(); /* extra delay after WR9 access */ 228 SCC_WRITE(10, 0); /* NRZ mode */ 229 SCC_WRITE(11, clksrc); /* main clock source */ 230 SCC_WRITE(12, div); /* BRG value */ 231 SCC_WRITE(13, 0); /* BRG high byte */ 232 SCC_WRITE(14, brgsrc_table[baud]); 233 SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0)); 234 SCC_WRITE(3, reg3 | 1); 235 SCC_WRITE(5, reg5 | 8); 236 237 atari_SCC_reset_done = 1; 238} 239 240static void __init atari_init_midi_port(int cflag) 241{ 242 int baud = cflag & CBAUD; 243 int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00; 244 /* warning 7N1 isn't possible! (instead 7O2 is used...) */ 245 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04; 246 int div; 247 248 /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as 249 * default) the standard MIDI speed 31250. */ 250 if (cflag & CBAUDEX) 251 baud += B38400; 252 if (baud == B4800) 253 div = ACIA_DIV64; /* really 7812.5 bps */ 254 else if (baud == B38400+2 /* 115200 */) 255 div = ACIA_DIV1; /* really 500 kbps (does that work??) */ 256 else 257 div = ACIA_DIV16; /* 31250 bps, standard for MIDI */ 258 259 /* RTS low, ints disabled */ 260 acia.mid_ctrl = div | csize | parity | 261 ((atari_switches & ATARI_SWITCH_MIDI) ? 262 ACIA_RHTID : ACIA_RLTID); 263} 264 265static int __init atari_debug_setup(char *arg) 266{ 267 if (!MACH_IS_ATARI) 268 return 0; 269 270 if (!strcmp(arg, "ser")) 271 /* defaults to ser2 for a Falcon and ser1 otherwise */ 272 arg = MACH_IS_FALCON ? "ser2" : "ser1"; 273 274 if (!strcmp(arg, "ser1")) { 275 /* ST-MFP Modem1 serial port */ 276 atari_init_mfp_port(B9600|CS8); 277 atari_console_driver.write = atari_mfp_console_write; 278 } else if (!strcmp(arg, "ser2")) { 279 /* SCC Modem2 serial port */ 280 atari_init_scc_port(B9600|CS8); 281 atari_console_driver.write = atari_scc_console_write; 282 } else if (!strcmp(arg, "midi")) { 283 /* MIDI port */ 284 atari_init_midi_port(B9600|CS8); 285 atari_console_driver.write = atari_midi_console_write; 286 } else if (!strcmp(arg, "par")) { 287 /* parallel printer */ 288 atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */ 289 sound_ym.rd_data_reg_sel = 7; /* select mixer control */ 290 sound_ym.wd_data = 0xff; /* sound off, ports are output */ 291 sound_ym.rd_data_reg_sel = 15; /* select port B */ 292 sound_ym.wd_data = 0; /* no char */ 293 sound_ym.rd_data_reg_sel = 14; /* select port A */ 294 sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */ 295 atari_console_driver.write = atari_par_console_write; 296 } 297 if (atari_console_driver.write) 298 register_console(&atari_console_driver); 299 300 return 0; 301} 302 303early_param("debug", atari_debug_setup); 304