2 * linux/arch/m68k/atari/debug.c
4 * Atari debugging and serial console stuff
6 * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
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
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>
19 #include <asm/atarihw.h>
20 #include <asm/atariints.h>
22 /* Flag that Modem1 port is already initialized and used */
23 int atari_MFP_init_done;
24 /* Flag that Modem1 port is already initialized and used */
25 int 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 */
28 int atari_SCC_reset_done;
30 static struct console atari_console_driver = {
32 .flags = CON_PRINTBUFFER,
37 static inline void ata_mfp_out(char c)
39 while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */
44 void atari_mfp_console_write(struct console *co, const char *str,
54 static inline void ata_scc_out(char c)
58 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
63 void atari_scc_console_write(struct console *co, const char *str,
73 static inline void ata_midi_out(char c)
75 while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */
80 void atari_midi_console_write(struct console *co, const char *str,
90 static int ata_par_out(char c)
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;
96 while ((mfp.par_dt_reg & 1) && --i) /* wait for BUSY == L */
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 */
111 static void atari_par_console_write(struct console *co, const char *str,
114 static int printer_present = 1;
116 if (!printer_present)
121 if (!ata_par_out('\r')) {
126 if (!ata_par_out(*str++)) {
133 #ifdef CONFIG_SERIAL_CONSOLE
134 int atari_mfp_console_wait_key(struct console *co)
136 while (!(mfp.rcv_stat & 0x80)) /* wait for rx buf filled */
138 return mfp.usart_dta;
141 int atari_scc_console_wait_key(struct console *co)
145 } while (!(scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
147 return scc.cha_b_data;
150 int atari_midi_console_wait_key(struct console *co)
152 while (!(acia.mid_ctrl & ACIA_RDRF)) /* wait for rx buf filled */
154 return acia.mid_data;
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.
163 #ifndef CONFIG_SERIAL_CONSOLE
164 static void __init atari_init_mfp_port(int cflag)
166 void atari_init_mfp_port(int cflag)
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
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;
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 */
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 */
191 atari_MFP_init_done = 1;
194 #define SCC_WRITE(reg, val) \
196 scc.cha_b_ctrl = (reg); \
198 scc.cha_b_ctrl = (val); \
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() \
207 for (i = 100; i > 0; --i) \
211 #ifndef CONFIG_SERIAL_CONSOLE
212 static void __init atari_init_scc_port(int cflag)
214 void atari_init_scc_port(int cflag)
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 };
231 int baud = cflag & CBAUD;
232 int clksrc, clkmode, div, reg3, reg5;
236 if (baud < B1200 || baud > B38400+2)
237 baud = B9600; /* use default 9600bps for non-implemented rates */
238 baud -= B1200; /* tables starts at 1200bps */
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 */
252 reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
253 reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
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);
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);
273 atari_SCC_reset_done = 1;
274 atari_SCC_init_done = 1;
277 #ifndef CONFIG_SERIAL_CONSOLE
278 static void __init atari_init_midi_port(int cflag)
280 void atari_init_midi_port(int cflag)
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;
289 /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
290 * default) the standard MIDI speed 31250. */
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??) */
298 div = ACIA_DIV16; /* 31250 bps, standard for MIDI */
300 /* RTS low, ints disabled */
301 acia.mid_ctrl = div | csize | parity |
302 ((atari_switches & ATARI_SWITCH_MIDI) ?
303 ACIA_RHTID : ACIA_RLTID);
306 static int __init atari_debug_setup(char *arg)
311 if (!strcmp(arg, "ser"))
312 /* defaults to ser2 for a Falcon and ser1 otherwise */
313 arg = MACH_IS_FALCON ? "ser2" : "ser1";
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")) {
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;
338 if (atari_console_driver.write)
339 register_console(&atari_console_driver);
344 early_param("debug", atari_debug_setup);