File: /usr/src/linux/arch/m68k/atari/debug.c
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/config.h>
14 #include <linux/types.h>
15 #include <linux/tty.h>
16 #include <linux/console.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19
20 #include <asm/atarihw.h>
21 #include <asm/atariints.h>
22
23 extern char m68k_debug_device[];
24
25 /* Flag that Modem1 port is already initialized and used */
26 int atari_MFP_init_done = 0;
27 /* Flag that Modem1 port is already initialized and used */
28 int atari_SCC_init_done = 0;
29 /* Can be set somewhere, if a SCC master reset has already be done and should
30 * not be repeated; used by kgdb */
31 int atari_SCC_reset_done = 0;
32
33 static struct console atari_console_driver = {
34 name: "debug",
35 flags: CON_PRINTBUFFER,
36 index: -1,
37 };
38
39
40 static inline void ata_mfp_out (char c)
41 {
42 while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */
43 barrier ();
44 mfp.usart_dta = c;
45 }
46
47 void atari_mfp_console_write (struct console *co, const char *str,
48 unsigned int count)
49 {
50 while (count--) {
51 if (*str == '\n')
52 ata_mfp_out( '\r' );
53 ata_mfp_out( *str++ );
54 }
55 }
56
57 static inline void ata_scc_out (char c)
58 {
59 do {
60 MFPDELAY();
61 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
62 MFPDELAY();
63 scc.cha_b_data = c;
64 }
65
66 void atari_scc_console_write (struct console *co, const char *str,
67 unsigned int count)
68 {
69 while (count--) {
70 if (*str == '\n')
71 ata_scc_out( '\r' );
72 ata_scc_out( *str++ );
73 }
74 }
75
76 static inline void ata_midi_out (char c)
77 {
78 while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */
79 barrier ();
80 acia.mid_data = c;
81 }
82
83 void atari_midi_console_write (struct console *co, const char *str,
84 unsigned int count)
85 {
86 while (count--) {
87 if (*str == '\n')
88 ata_midi_out( '\r' );
89 ata_midi_out( *str++ );
90 }
91 }
92
93 static int ata_par_out (char c)
94 {
95 unsigned char tmp;
96 /* This a some-seconds timeout in case no printer is connected */
97 unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ;
98
99 while( (mfp.par_dt_reg & 1) && --i ) /* wait for BUSY == L */
100 ;
101 if (!i) return( 0 );
102
103 sound_ym.rd_data_reg_sel = 15; /* select port B */
104 sound_ym.wd_data = c; /* put char onto port */
105 sound_ym.rd_data_reg_sel = 14; /* select port A */
106 tmp = sound_ym.rd_data_reg_sel;
107 sound_ym.wd_data = tmp & ~0x20; /* set strobe L */
108 MFPDELAY(); /* wait a bit */
109 sound_ym.wd_data = tmp | 0x20; /* set strobe H */
110 return( 1 );
111 }
112
113 static void atari_par_console_write (struct console *co, const char *str,
114 unsigned int count)
115 {
116 static int printer_present = 1;
117
118 if (!printer_present)
119 return;
120
121 while (count--) {
122 if (*str == '\n')
123 if (!ata_par_out( '\r' )) {
124 printer_present = 0;
125 return;
126 }
127 if (!ata_par_out( *str++ )) {
128 printer_present = 0;
129 return;
130 }
131 }
132 }
133
134 #ifdef CONFIG_SERIAL_CONSOLE
135 int atari_mfp_console_wait_key(struct console *co)
136 {
137 while( !(mfp.rcv_stat & 0x80) ) /* wait for rx buf filled */
138 barrier();
139 return( mfp.usart_dta );
140 }
141
142 int atari_scc_console_wait_key(struct console *co)
143 {
144 do {
145 MFPDELAY();
146 } while( !(scc.cha_b_ctrl & 0x01) ); /* wait for rx buf filled */
147 MFPDELAY();
148 return( scc.cha_b_data );
149 }
150
151 int atari_midi_console_wait_key(struct console *co)
152 {
153 while( !(acia.mid_ctrl & ACIA_RDRF) ) /* wait for rx buf filled */
154 barrier();
155 return( acia.mid_data );
156 }
157 #endif
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 #ifndef CONFIG_SERIAL_CONSOLE
163 static void __init atari_init_mfp_port( int cflag )
164 #else
165 void atari_init_mfp_port( int cflag )
166 #endif
167 {
168 /* timer values for 1200...115200 bps; > 38400 select 110, 134, or 150
169 * bps, resp., and work only correct if there's a RSVE or RSSPEED */
170 static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };
171 int baud = cflag & CBAUD;
172 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;
173 int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00;
174
175 if (cflag & CBAUDEX)
176 baud += B38400;
177 if (baud < B1200 || baud > B38400+2)
178 baud = B9600; /* use default 9600bps for non-implemented rates */
179 baud -= B1200; /* baud_table[] starts at 1200bps */
180
181 mfp.trn_stat &= ~0x01; /* disable TX */
182 mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
183 mfp.tim_ct_cd &= 0x70; /* stop timer D */
184 mfp.tim_dt_d = baud_table[baud];
185 mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */
186 mfp.trn_stat |= 0x01; /* enable TX */
187
188 atari_MFP_init_done = 1;
189 }
190
191 #define SCC_WRITE(reg,val) \
192 do { \
193 scc.cha_b_ctrl = (reg); \
194 MFPDELAY(); \
195 scc.cha_b_ctrl = (val); \
196 MFPDELAY(); \
197 } while(0)
198
199 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
200 * delay of ~ 60us. */
201 #define LONG_DELAY() \
202 do { \
203 int i; \
204 for( i = 100; i > 0; --i ) \
205 MFPDELAY(); \
206 } while(0)
207
208 #ifndef CONFIG_SERIAL_CONSOLE
209 static void __init atari_init_scc_port( int cflag )
210 #else
211 void atari_init_scc_port( int cflag )
212 #endif
213 {
214 extern int atari_SCC_reset_done;
215 static int clksrc_table[9] =
216 /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
217 { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
218 static int brgsrc_table[9] =
219 /* reg 14: 0 = RTxC, 2 = PCLK */
220 { 2, 2, 2, 2, 2, 2, 0, 2, 2 };
221 static int clkmode_table[9] =
222 /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
223 { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
224 static int div_table[9] =
225 /* reg12 (BRG low) */
226 { 208, 138, 103, 50, 24, 11, 1, 0, 0 };
227
228 int baud = cflag & CBAUD;
229 int clksrc, clkmode, div, reg3, reg5;
230
231 if (cflag & CBAUDEX)
232 baud += B38400;
233 if (baud < B1200 || baud > B38400+2)
234 baud = B9600; /* use default 9600bps for non-implemented rates */
235 baud -= B1200; /* tables starts at 1200bps */
236
237 clksrc = clksrc_table[baud];
238 clkmode = clkmode_table[baud];
239 div = div_table[baud];
240 if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {
241 /* special treatment for TT, where rates >= 38400 are done via TRxC */
242 clksrc = 0x28; /* TRxC */
243 clkmode = baud == 6 ? 0xc0 :
244 baud == 7 ? 0x80 : /* really 76800bps */
245 0x40; /* really 153600bps */
246 div = 0;
247 }
248
249 reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
250 reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
251
252 (void)scc.cha_b_ctrl; /* reset reg pointer */
253 SCC_WRITE( 9, 0xc0 ); /* reset */
254 LONG_DELAY(); /* extra delay after WR9 access */
255 SCC_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
256 0x04 /* 1 stopbit */ |
257 clkmode );
258 SCC_WRITE( 3, reg3 );
259 SCC_WRITE( 5, reg5 );
260 SCC_WRITE( 9, 0 ); /* no interrupts */
261 LONG_DELAY(); /* extra delay after WR9 access */
262 SCC_WRITE( 10, 0 ); /* NRZ mode */
263 SCC_WRITE( 11, clksrc ); /* main clock source */
264 SCC_WRITE( 12, div ); /* BRG value */
265 SCC_WRITE( 13, 0 ); /* BRG high byte */
266 SCC_WRITE( 14, brgsrc_table[baud] );
267 SCC_WRITE( 14, brgsrc_table[baud] | (div ? 1 : 0) );
268 SCC_WRITE( 3, reg3 | 1 );
269 SCC_WRITE( 5, reg5 | 8 );
270
271 atari_SCC_reset_done = 1;
272 atari_SCC_init_done = 1;
273 }
274
275 #ifndef CONFIG_SERIAL_CONSOLE
276 static void __init atari_init_midi_port( int cflag )
277 #else
278 void atari_init_midi_port( int cflag )
279 #endif
280 {
281 int baud = cflag & CBAUD;
282 int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;
283 /* warning 7N1 isn't possible! (instead 7O2 is used...) */
284 int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;
285 int div;
286
287 /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
288 * default) the standard MIDI speed 31250. */
289 if (cflag & CBAUDEX)
290 baud += B38400;
291 if (baud == B4800)
292 div = ACIA_DIV64; /* really 7812.5 bps */
293 else if (baud == B38400+2 /* 115200 */)
294 div = ACIA_DIV1; /* really 500 kbps (does that work??) */
295 else
296 div = ACIA_DIV16; /* 31250 bps, standard for MIDI */
297
298 /* RTS low, ints disabled */
299 acia.mid_ctrl = div | csize | parity |
300 ((atari_switches & ATARI_SWITCH_MIDI) ?
301 ACIA_RHTID : ACIA_RLTID);
302 }
303
304 void __init atari_debug_init(void)
305 {
306 if (!strcmp( m68k_debug_device, "ser" )) {
307 /* defaults to ser2 for a Falcon and ser1 otherwise */
308 strcpy( m68k_debug_device, MACH_IS_FALCON ? "ser2" : "ser1" );
309
310 }
311
312 if (!strcmp( m68k_debug_device, "ser1" )) {
313 /* ST-MFP Modem1 serial port */
314 atari_init_mfp_port( B9600|CS8 );
315 atari_console_driver.write = atari_mfp_console_write;
316 }
317 else if (!strcmp( m68k_debug_device, "ser2" )) {
318 /* SCC Modem2 serial port */
319 atari_init_scc_port( B9600|CS8 );
320 atari_console_driver.write = atari_scc_console_write;
321 }
322 else if (!strcmp( m68k_debug_device, "midi" )) {
323 /* MIDI port */
324 atari_init_midi_port( B9600|CS8 );
325 atari_console_driver.write = atari_midi_console_write;
326 }
327 else if (!strcmp( m68k_debug_device, "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
342 /*
343 * Local variables:
344 * c-indent-level: 4
345 * tab-width: 8
346 * End:
347 */
348