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/config.h>
18 #include <linux/types.h>
19 #include <linux/sched.h>
20 #include <linux/tty.h>
21 #include <linux/console.h>
22 #include <linux/init.h>
23 #include <linux/delay.h>
25 #define BOOTINFO_COMPAT_1_0
26 #include <asm/setup.h>
27 #include <asm/bootinfo.h>
28 #include <asm/machw.h>
29 #include <asm/macints.h>
31 extern char m68k_debug_device[];
33 extern struct compat_bootinfo compat_boot_info;
35 extern unsigned long mac_videobase;
36 extern unsigned long mac_videodepth;
37 extern unsigned long mac_rowbytes;
39 extern void mac_serial_print(const char *);
46 * These two auxiliary debug functions should go away ASAP. Only usage:
47 * before the console output is up (after head.S come some other crucial
48 * setup routines :-) it permits writing 'data' to the screen as bit patterns
49 * (good luck reading those). Helped to figure that the bootinfo contained
50 * garbage data on the amount and size of memory chunks ...
52 * The 'pos' argument now simply means 'linefeed after print' ...
56 static int peng=0, line=0;
59 void mac_debugging_short(int pos, short num)
62 unsigned char *pengoffset;
68 printk("debug: %d !\n", num);
73 /* printk("debug: %d !\n", num); */
77 /* calculate current offset */
78 pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
83 for(i=0;i<8*sizeof(short);i++) /* # of bits */
85 /* value mask for bit i, reverse order */
86 *pptr++ = (num & ( 1 << (8*sizeof(short)-i-1) ) ? 0xFF : 0x00);
98 void mac_debugging_long(int pos, long addr)
101 unsigned char *pengoffset;
107 printk("debug: #%ld !\n", addr);
112 /* printk("debug: #%ld !\n", addr); */
116 pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
121 for(i=0;i<8*sizeof(long);i++) /* # of bits */
123 *pptr++ = (addr & ( 1 << (8*sizeof(long)-i-1) ) ? 0xFF : 0x00);
137 * TODO: serial debug code
151 # define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))
153 /* Flag that serial port is already initialized and used */
154 int mac_SCC_init_done;
155 /* Can be set somewhere, if a SCC master reset has already be done and should
156 * not be repeated; used by kgdb */
157 int mac_SCC_reset_done;
159 static int scc_port = -1;
161 static struct console mac_console_driver = {
163 .flags = CON_PRINTBUFFER,
168 * Crude hack to get console output to the screen before the framebuffer
169 * is initialized (happens a lot later in 2.1!).
170 * We just use the console routines declared in head.S, this will interfere
171 * with regular framebuffer console output and should be used exclusively
172 * to debug kernel problems manifesting before framebuffer init (aka WSOD)
174 * To keep this hack from interfering with the regular console driver, either
175 * deregister this driver before/on framebuffer console init, or silence this
176 * function after the fbcon driver is running (will lose console messages!?).
177 * To debug real early bugs, need to write a 'mac_register_console_hack()'
178 * that is called from start_kernel() before setup_arch() and just registers
179 * this driver if Mac.
182 void mac_debug_console_write (struct console *co, const char *str,
185 mac_serial_print(str);
190 /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
194 static inline void mac_sccb_out (char c)
198 for( i = uSEC; i > 0; --i )
200 } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
201 for( i = uSEC; i > 0; --i )
206 static inline void mac_scca_out (char c)
210 for( i = uSEC; i > 0; --i )
212 } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
213 for( i = uSEC; i > 0; --i )
218 void mac_sccb_console_write (struct console *co, const char *str,
223 mac_sccb_out( '\r' );
224 mac_sccb_out( *str++ );
228 void mac_scca_console_write (struct console *co, const char *str,
233 mac_scca_out( '\r' );
234 mac_scca_out( *str++ );
239 /* The following two functions do a quick'n'dirty initialization of the MFP or
240 * SCC serial ports. They're used by the debugging interface, kgdb, and the
241 * serial console code. */
242 #define SCCB_WRITE(reg,val) \
245 scc.cha_b_ctrl = (reg); \
246 for( i = uSEC; i > 0; --i ) \
248 scc.cha_b_ctrl = (val); \
249 for( i = uSEC; i > 0; --i ) \
253 #define SCCA_WRITE(reg,val) \
256 scc.cha_a_ctrl = (reg); \
257 for( i = uSEC; i > 0; --i ) \
259 scc.cha_a_ctrl = (val); \
260 for( i = uSEC; i > 0; --i ) \
264 /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
265 * delay of ~ 60us. */
266 /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
267 #define LONG_DELAY() \
270 for( i = 60*uSEC; i > 0; --i ) \
274 #ifndef CONFIG_SERIAL_CONSOLE
275 static void __init mac_init_scc_port( int cflag, int port )
277 void mac_init_scc_port( int cflag, int port )
280 extern int mac_SCC_reset_done;
283 * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
286 static int clksrc_table[9] =
287 /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
288 { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
289 static int clkmode_table[9] =
290 /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
291 { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
292 static int div_table[9] =
293 /* reg12 (BRG low) */
294 { 94, 62, 46, 22, 10, 4, 1, 0, 0 };
296 int baud = cflag & CBAUD;
297 int clksrc, clkmode, div, reg3, reg5;
301 if (baud < B1200 || baud > B38400+2)
302 baud = B9600; /* use default 9600bps for non-implemented rates */
303 baud -= B1200; /* tables starts at 1200bps */
305 clksrc = clksrc_table[baud];
306 clkmode = clkmode_table[baud];
307 div = div_table[baud];
309 reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
310 reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;
313 (void)scc.cha_b_ctrl; /* reset reg pointer */
314 SCCB_WRITE( 9, 0xc0 ); /* reset */
315 LONG_DELAY(); /* extra delay after WR9 access */
316 SCCB_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
317 0x04 /* 1 stopbit */ |
319 SCCB_WRITE( 3, reg3 );
320 SCCB_WRITE( 5, reg5 );
321 SCCB_WRITE( 9, 0 ); /* no interrupts */
322 LONG_DELAY(); /* extra delay after WR9 access */
323 SCCB_WRITE( 10, 0 ); /* NRZ mode */
324 SCCB_WRITE( 11, clksrc ); /* main clock source */
325 SCCB_WRITE( 12, div ); /* BRG value */
326 SCCB_WRITE( 13, 0 ); /* BRG high byte */
328 SCCB_WRITE( 3, reg3 | 1 );
329 SCCB_WRITE( 5, reg5 | 8 );
330 } else if (port == 0) {
331 (void)scc.cha_a_ctrl; /* reset reg pointer */
332 SCCA_WRITE( 9, 0xc0 ); /* reset */
333 LONG_DELAY(); /* extra delay after WR9 access */
334 SCCA_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
335 0x04 /* 1 stopbit */ |
337 SCCA_WRITE( 3, reg3 );
338 SCCA_WRITE( 5, reg5 );
339 SCCA_WRITE( 9, 0 ); /* no interrupts */
340 LONG_DELAY(); /* extra delay after WR9 access */
341 SCCA_WRITE( 10, 0 ); /* NRZ mode */
342 SCCA_WRITE( 11, clksrc ); /* main clock source */
343 SCCA_WRITE( 12, div ); /* BRG value */
344 SCCA_WRITE( 13, 0 ); /* BRG high byte */
346 SCCA_WRITE( 3, reg3 | 1 );
347 SCCA_WRITE( 5, reg5 | 8 );
350 mac_SCC_reset_done = 1;
351 mac_SCC_init_done = 1;
353 #endif /* DEBUG_SERIAL */
355 void mac_init_scca_port( int cflag )
357 mac_init_scc_port(cflag, 0);
360 void mac_init_sccb_port( int cflag )
362 mac_init_scc_port(cflag, 1);
365 void __init mac_debug_init(void)
368 if ( !strcmp( m68k_debug_device, "ser" )
369 || !strcmp( m68k_debug_device, "ser1" )) {
371 mac_init_scc_port( B9600|CS8, 0 );
372 mac_console_driver.write = mac_scca_console_write;
375 else if (!strcmp( m68k_debug_device, "ser2" )) {
376 /* Mac printer port */
377 mac_init_scc_port( B9600|CS8, 1 );
378 mac_console_driver.write = mac_sccb_console_write;
383 if ( !strcmp( m68k_debug_device, "scn" )
384 || !strcmp( m68k_debug_device, "con" )) {
385 /* display, using head.S console routines */
386 mac_console_driver.write = mac_debug_console_write;
389 if (mac_console_driver.write)
390 register_console(&mac_console_driver);