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Linux/arch/m68k/atari/debug.c

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  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 

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