2 * linux/arch/m68k/mac/debug.c
4 * Shamelessly stolen (SCC code and general framework) from:
6 * linux/arch/m68k/atari/debug.c
8 * Atari debugging and serial console stuff
10 * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file COPYING in the main directory of this archive
17 #include <linux/types.h>
18 #include <linux/sched.h>
19 #include <linux/tty.h>
20 #include <linux/console.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
24 #define BOOTINFO_COMPAT_1_0
25 #include <asm/setup.h>
26 #include <asm/bootinfo.h>
27 #include <asm/machw.h>
28 #include <asm/macints.h>
30 extern char m68k_debug_device[];
32 extern struct compat_bootinfo compat_boot_info;
34 extern unsigned long mac_videobase;
35 extern unsigned long mac_videodepth;
36 extern unsigned long mac_rowbytes;
38 extern void mac_serial_print(const char *);
45 * These two auxiliary debug functions should go away ASAP. Only usage:
46 * before the console output is up (after head.S come some other crucial
47 * setup routines :-) it permits writing 'data' to the screen as bit patterns
48 * (good luck reading those). Helped to figure that the bootinfo contained
49 * garbage data on the amount and size of memory chunks ...
51 * The 'pos' argument now simply means 'linefeed after print' ...
55 static int peng=0, line=0;
58 void mac_debugging_short(int pos, short num)
61 unsigned char *pengoffset;
67 printk("debug: %d !\n", num);
72 /* printk("debug: %d !\n", num); */
76 /* calculate current offset */
77 pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
82 for(i=0;i<8*sizeof(short);i++) /* # of bits */
84 /* value mask for bit i, reverse order */
85 *pptr++ = (num & ( 1 << (8*sizeof(short)-i-1) ) ? 0xFF : 0x00);
97 void mac_debugging_long(int pos, long addr)
100 unsigned char *pengoffset;
106 printk("debug: #%ld !\n", addr);
111 /* printk("debug: #%ld !\n", addr); */
115 pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
120 for(i=0;i<8*sizeof(long);i++) /* # of bits */
122 *pptr++ = (addr & ( 1 << (8*sizeof(long)-i-1) ) ? 0xFF : 0x00);
136 * TODO: serial debug code
150 # define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))
152 /* Flag that serial port is already initialized and used */
153 int mac_SCC_init_done;
154 /* Can be set somewhere, if a SCC master reset has already be done and should
155 * not be repeated; used by kgdb */
156 int mac_SCC_reset_done;
158 static int scc_port = -1;
160 static struct console mac_console_driver = {
162 .flags = CON_PRINTBUFFER,
167 * Crude hack to get console output to the screen before the framebuffer
168 * is initialized (happens a lot later in 2.1!).
169 * We just use the console routines declared in head.S, this will interfere
170 * with regular framebuffer console output and should be used exclusively
171 * to debug kernel problems manifesting before framebuffer init (aka WSOD)
173 * To keep this hack from interfering with the regular console driver, either
174 * deregister this driver before/on framebuffer console init, or silence this
175 * function after the fbcon driver is running (will lose console messages!?).
176 * To debug real early bugs, need to write a 'mac_register_console_hack()'
177 * that is called from start_kernel() before setup_arch() and just registers
178 * this driver if Mac.
181 void mac_debug_console_write (struct console *co, const char *str,
184 mac_serial_print(str);
189 /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
193 static inline void mac_sccb_out (char c)
197 for( i = uSEC; i > 0; --i )
199 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
200 for( i = uSEC; i > 0; --i )
205 static inline void mac_scca_out (char c)
209 for( i = uSEC; i > 0; --i )
211 } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
212 for( i = uSEC; i > 0; --i )
217 void mac_sccb_console_write (struct console *co, const char *str,
222 mac_sccb_out( '\r' );
223 mac_sccb_out( *str++ );
227 void mac_scca_console_write (struct console *co, const char *str,
232 mac_scca_out( '\r' );
233 mac_scca_out( *str++ );
238 /* The following two functions do a quick'n'dirty initialization of the MFP or
239 * SCC serial ports. They're used by the debugging interface, kgdb, and the
240 * serial console code. */
241 #define SCCB_WRITE(reg,val) \
244 scc.cha_b_ctrl = (reg); \
245 for( i = uSEC; i > 0; --i ) \
247 scc.cha_b_ctrl = (val); \
248 for( i = uSEC; i > 0; --i ) \
252 #define SCCA_WRITE(reg,val) \
255 scc.cha_a_ctrl = (reg); \
256 for( i = uSEC; i > 0; --i ) \
258 scc.cha_a_ctrl = (val); \
259 for( i = uSEC; i > 0; --i ) \
263 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
264 * delay of ~ 60us. */
265 /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
266 #define LONG_DELAY() \
269 for( i = 60*uSEC; i > 0; --i ) \
273 #ifndef CONFIG_SERIAL_CONSOLE
274 static void __init mac_init_scc_port( int cflag, int port )
276 void mac_init_scc_port( int cflag, int port )
279 extern int mac_SCC_reset_done;
282 * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
285 static int clksrc_table[9] =
286 /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
287 { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
288 static int clkmode_table[9] =
289 /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
290 { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
291 static int div_table[9] =
292 /* reg12 (BRG low) */
293 { 94, 62, 46, 22, 10, 4, 1, 0, 0 };
295 int baud = cflag & CBAUD;
296 int clksrc, clkmode, div, reg3, reg5;
300 if (baud < B1200 || baud > B38400+2)
301 baud = B9600; /* use default 9600bps for non-implemented rates */
302 baud -= B1200; /* tables starts at 1200bps */
304 clksrc = clksrc_table[baud];
305 clkmode = clkmode_table[baud];
306 div = div_table[baud];
308 reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
309 reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;
312 (void)scc.cha_b_ctrl; /* reset reg pointer */
313 SCCB_WRITE( 9, 0xc0 ); /* reset */
314 LONG_DELAY(); /* extra delay after WR9 access */
315 SCCB_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
316 0x04 /* 1 stopbit */ |
318 SCCB_WRITE( 3, reg3 );
319 SCCB_WRITE( 5, reg5 );
320 SCCB_WRITE( 9, 0 ); /* no interrupts */
321 LONG_DELAY(); /* extra delay after WR9 access */
322 SCCB_WRITE( 10, 0 ); /* NRZ mode */
323 SCCB_WRITE( 11, clksrc ); /* main clock source */
324 SCCB_WRITE( 12, div ); /* BRG value */
325 SCCB_WRITE( 13, 0 ); /* BRG high byte */
327 SCCB_WRITE( 3, reg3 | 1 );
328 SCCB_WRITE( 5, reg5 | 8 );
329 } else if (port == 0) {
330 (void)scc.cha_a_ctrl; /* reset reg pointer */
331 SCCA_WRITE( 9, 0xc0 ); /* reset */
332 LONG_DELAY(); /* extra delay after WR9 access */
333 SCCA_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
334 0x04 /* 1 stopbit */ |
336 SCCA_WRITE( 3, reg3 );
337 SCCA_WRITE( 5, reg5 );
338 SCCA_WRITE( 9, 0 ); /* no interrupts */
339 LONG_DELAY(); /* extra delay after WR9 access */
340 SCCA_WRITE( 10, 0 ); /* NRZ mode */
341 SCCA_WRITE( 11, clksrc ); /* main clock source */
342 SCCA_WRITE( 12, div ); /* BRG value */
343 SCCA_WRITE( 13, 0 ); /* BRG high byte */
345 SCCA_WRITE( 3, reg3 | 1 );
346 SCCA_WRITE( 5, reg5 | 8 );
349 mac_SCC_reset_done = 1;
350 mac_SCC_init_done = 1;
352 #endif /* DEBUG_SERIAL */
354 void mac_init_scca_port( int cflag )
356 mac_init_scc_port(cflag, 0);
359 void mac_init_sccb_port( int cflag )
361 mac_init_scc_port(cflag, 1);
364 void __init mac_debug_init(void)
367 if ( !strcmp( m68k_debug_device, "ser" )
368 || !strcmp( m68k_debug_device, "ser1" )) {
370 mac_init_scc_port( B9600|CS8, 0 );
371 mac_console_driver.write = mac_scca_console_write;
374 else if (!strcmp( m68k_debug_device, "ser2" )) {
375 /* Mac printer port */
376 mac_init_scc_port( B9600|CS8, 1 );
377 mac_console_driver.write = mac_sccb_console_write;
382 if ( !strcmp( m68k_debug_device, "scn" )
383 || !strcmp( m68k_debug_device, "con" )) {
384 /* display, using head.S console routines */
385 mac_console_driver.write = mac_debug_console_write;
388 if (mac_console_driver.write)
389 register_console(&mac_console_driver);