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(c: '\r'); |
48 | ata_mfp_out(c: *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(c: '\r'); |
67 | ata_scc_out(c: *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(c: '\r'); |
84 | ata_midi_out(c: *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(c: '\r')) { |
120 | printer_present = 0; |
121 | return; |
122 | } |
123 | } |
124 | if (!ata_par_out(c: *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 | static int clksrc_table[9] = |
206 | /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */ |
207 | { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 }; |
208 | static int brgsrc_table[9] = |
209 | /* reg 14: 0 = RTxC, 2 = PCLK */ |
210 | { 2, 2, 2, 2, 2, 2, 0, 2, 2 }; |
211 | static int clkmode_table[9] = |
212 | /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */ |
213 | { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 }; |
214 | static int div_table[9] = |
215 | /* reg12 (BRG low) */ |
216 | { 208, 138, 103, 50, 24, 11, 1, 0, 0 }; |
217 | |
218 | int baud = cflag & CBAUD; |
219 | int clksrc, clkmode, div, reg3, reg5; |
220 | |
221 | if (cflag & CBAUDEX) |
222 | baud += B38400; |
223 | if (baud < B1200 || baud > B38400+2) |
224 | baud = B9600; /* use default 9600bps for non-implemented rates */ |
225 | baud -= B1200; /* tables starts at 1200bps */ |
226 | |
227 | clksrc = clksrc_table[baud]; |
228 | clkmode = clkmode_table[baud]; |
229 | div = div_table[baud]; |
230 | if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) { |
231 | /* special treatment for TT, where rates >= 38400 are done via TRxC */ |
232 | clksrc = 0x28; /* TRxC */ |
233 | clkmode = baud == 6 ? 0xc0 : |
234 | baud == 7 ? 0x80 : /* really 76800bps */ |
235 | 0x40; /* really 153600bps */ |
236 | div = 0; |
237 | } |
238 | |
239 | reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40; |
240 | reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */; |
241 | |
242 | (void)atari_scc.cha_b_ctrl; /* reset reg pointer */ |
243 | SCC_WRITE(9, 0xc0); /* reset */ |
244 | LONG_DELAY(); /* extra delay after WR9 access */ |
245 | SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) |
246 | : 0 | 0x04 /* 1 stopbit */ | clkmode); |
247 | SCC_WRITE(3, reg3); |
248 | SCC_WRITE(5, reg5); |
249 | SCC_WRITE(9, 0); /* no interrupts */ |
250 | LONG_DELAY(); /* extra delay after WR9 access */ |
251 | SCC_WRITE(10, 0); /* NRZ mode */ |
252 | SCC_WRITE(11, clksrc); /* main clock source */ |
253 | SCC_WRITE(12, div); /* BRG value */ |
254 | SCC_WRITE(13, 0); /* BRG high byte */ |
255 | SCC_WRITE(14, brgsrc_table[baud]); |
256 | SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0)); |
257 | SCC_WRITE(3, reg3 | 1); |
258 | SCC_WRITE(5, reg5 | 8); |
259 | |
260 | atari_SCC_reset_done = 1; |
261 | } |
262 | |
263 | static void __init atari_init_midi_port(int cflag) |
264 | { |
265 | int baud = cflag & CBAUD; |
266 | int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00; |
267 | /* warning 7N1 isn't possible! (instead 7O2 is used...) */ |
268 | int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04; |
269 | int div; |
270 | |
271 | /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as |
272 | * default) the standard MIDI speed 31250. */ |
273 | if (cflag & CBAUDEX) |
274 | baud += B38400; |
275 | if (baud == B4800) |
276 | div = ACIA_DIV64; /* really 7812.5 bps */ |
277 | else if (baud == B38400+2 /* 115200 */) |
278 | div = ACIA_DIV1; /* really 500 kbps (does that work??) */ |
279 | else |
280 | div = ACIA_DIV16; /* 31250 bps, standard for MIDI */ |
281 | |
282 | /* RTS low, ints disabled */ |
283 | acia.mid_ctrl = div | csize | parity | |
284 | ((atari_switches & ATARI_SWITCH_MIDI) ? |
285 | ACIA_RHTID : ACIA_RLTID); |
286 | } |
287 | |
288 | static int __init atari_debug_setup(char *arg) |
289 | { |
290 | bool registered; |
291 | |
292 | if (!MACH_IS_ATARI) |
293 | return 0; |
294 | |
295 | if (!strcmp(arg, "ser" )) |
296 | /* defaults to ser2 for a Falcon and ser1 otherwise */ |
297 | arg = MACH_IS_FALCON ? "ser2" : "ser1" ; |
298 | |
299 | registered = !!atari_console_driver.write; |
300 | if (!strcmp(arg, "ser1" )) { |
301 | /* ST-MFP Modem1 serial port */ |
302 | atari_init_mfp_port(B9600|CS8); |
303 | atari_console_driver.write = atari_mfp_console_write; |
304 | } else if (!strcmp(arg, "ser2" )) { |
305 | /* SCC Modem2 serial port */ |
306 | atari_init_scc_port(B9600|CS8); |
307 | atari_console_driver.write = atari_scc_console_write; |
308 | } else if (!strcmp(arg, "midi" )) { |
309 | /* MIDI port */ |
310 | atari_init_midi_port(B9600|CS8); |
311 | atari_console_driver.write = atari_midi_console_write; |
312 | } else if (!strcmp(arg, "par" )) { |
313 | /* parallel printer */ |
314 | atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */ |
315 | sound_ym.rd_data_reg_sel = 7; /* select mixer control */ |
316 | sound_ym.wd_data = 0xff; /* sound off, ports are output */ |
317 | sound_ym.rd_data_reg_sel = 15; /* select port B */ |
318 | sound_ym.wd_data = 0; /* no char */ |
319 | sound_ym.rd_data_reg_sel = 14; /* select port A */ |
320 | sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */ |
321 | atari_console_driver.write = atari_par_console_write; |
322 | } |
323 | if (atari_console_driver.write && !registered) |
324 | register_console(&atari_console_driver); |
325 | |
326 | return 0; |
327 | } |
328 | |
329 | early_param("debug" , atari_debug_setup); |
330 | |