/* * linux/arch/m68k/mac/debug.c * * Shamelessly stolen (SCC code and general framework) from: * * linux/arch/m68k/atari/debug.c * * Atari debugging and serial console stuff * * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include #include #include #include #include #include #include #define BOOTINFO_COMPAT_1_0 #include #include #include #include extern char m68k_debug_device[]; extern struct compat_bootinfo compat_boot_info; extern unsigned long mac_videobase; extern unsigned long mac_videodepth; extern unsigned long mac_rowbytes; extern void mac_serial_print(const char *); #define DEBUG_HEADS #undef DEBUG_SCREEN #define DEBUG_SERIAL /* * These two auxiliary debug functions should go away ASAP. Only usage: * before the console output is up (after head.S come some other crucial * setup routines :-) it permits writing 'data' to the screen as bit patterns * (good luck reading those). Helped to figure that the bootinfo contained * garbage data on the amount and size of memory chunks ... * * The 'pos' argument now simply means 'linefeed after print' ... */ #ifdef DEBUG_SCREEN static int peng=0, line=0; #endif void mac_debugging_short(int pos, short num) { #ifdef DEBUG_SCREEN unsigned char *pengoffset; unsigned char *pptr; int i; #endif #ifdef DEBUG_SERIAL printk("debug: %d !\n", num); #endif #ifdef DEBUG_SCREEN if (!MACH_IS_MAC) { /* printk("debug: %d !\n", num); */ return; } /* calculate current offset */ pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes) +80*peng; pptr=pengoffset; for(i=0;i { /* value mask for bit i, reverse order */ *pptr++ = (num & ( 1 } peng++; if (pos) { line++; peng = 0; } #endif } void mac_debugging_long(int pos, long addr) { #ifdef DEBUG_SCREEN unsigned char *pengoffset; unsigned char *pptr; int i; #endif #ifdef DEBUG_SERIAL printk("debug: #%ld !\n", addr); #endif #ifdef DEBUG_SCREEN if (!MACH_IS_MAC) { /* printk("debug: #%ld !\n", addr); */ return; } pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes) +80*peng; pptr=pengoffset; for(i=0;i { *pptr++ = (addr & ( 1 } peng++; if (pos) { line++; peng = 0; } #endif } #ifdef DEBUG_SERIAL /* * TODO: serial debug code */ struct mac_SCC { u_char cha_b_ctrl; u_char char_dummy1; u_char cha_a_ctrl; u_char char_dummy2; u_char cha_b_data; u_char char_dummy3; u_char cha_a_data; }; # define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase)) /* Flag that serial port is already initialized and used */ int mac_SCC_init_done = 0; /* Can be set somewhere, if a SCC master reset has already be done and should * not be repeated; used by kgdb */ int mac_SCC_reset_done = 0; static int scc_port = -1; static struct console mac_console_driver = { name: "debug", flags: CON_PRINTBUFFER, index: -1, }; /* * Crude hack to get console output to the screen before the framebuffer * is initialized (happens a lot later in 2.1!). * We just use the console routines declared in head.S, this will interfere * with regular framebuffer console output and should be used exclusively * to debug kernel problems manifesting before framebuffer init (aka WSOD) * * To keep this hack from interfering with the regular console driver, either * deregister this driver before/on framebuffer console init, or silence this * function after the fbcon driver is running (will lose console messages!?). * To debug real early bugs, need to write a 'mac_register_console_hack()' * that is called from start_kernel() before setup_arch() and just registers * this driver if Mac. */ void mac_debug_console_write (struct console *co, const char *str, unsigned int count) { mac_serial_print(str); } /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/ #define uSEC 1 static inline void mac_sccb_out (char c) { int i; do { for( i = uSEC; i > 0; --i ) barrier(); } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */ for( i = uSEC; i > 0; --i ) barrier(); scc.cha_b_data = c; } static inline void mac_scca_out (char c) { int i; do { for( i = uSEC; i > 0; --i ) barrier(); } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */ for( i = uSEC; i > 0; --i ) barrier(); scc.cha_a_data = c; } void mac_sccb_console_write (struct console *co, const char *str, unsigned int count) { while (count--) { if (*str == '\n') mac_sccb_out( '\r' ); mac_sccb_out( *str++ ); } } void mac_scca_console_write (struct console *co, const char *str, unsigned int count) { while (count--) { if (*str == '\n') mac_scca_out( '\r' ); mac_scca_out( *str++ ); } } /* The following two functions do a quick'n'dirty initialization of the MFP or * SCC serial ports. They're used by the debugging interface, kgdb, and the * serial console code. */ #define SCCB_WRITE(reg,val) \ do { \ int i; \ scc.cha_b_ctrl = (reg); \ for( i = uSEC; i > 0; --i ) \ barrier(); \ scc.cha_b_ctrl = (val); \ for( i = uSEC; i > 0; --i ) \ barrier(); \ } while(0) #define SCCA_WRITE(reg,val) \ do { \ int i; \ scc.cha_a_ctrl = (reg); \ for( i = uSEC; i > 0; --i ) \ barrier(); \ scc.cha_a_ctrl = (val); \ for( i = uSEC; i > 0; --i ) \ barrier(); \ } while(0) /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a * delay of ~ 60us. */ /* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/ #define LONG_DELAY() \ do { \ int i; \ for( i = 60*uSEC; i > 0; --i ) \ barrier(); \ } while(0) #ifndef CONFIG_SERIAL_CONSOLE static void __init mac_init_scc_port( int cflag, int port ) #else void mac_init_scc_port( int cflag, int port ) #endif { extern int mac_SCC_reset_done; /* * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k */ static int clksrc_table[9] = /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */ { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 }; static int clkmode_table[9] = /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */ { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 }; static int div_table[9] = /* reg12 (BRG low) */ { 94, 62, 46, 22, 10, 4, 1, 0, 0 }; int baud = cflag & CBAUD; int clksrc, clkmode, div, reg3, reg5; if (cflag & CBAUDEX) baud += B38400; if (baud < B1200 || baud > B38400+2) baud = B9600; /* use default 9600bps for non-implemented rates */ baud -= B1200; /* tables starts at 1200bps */ clksrc = clksrc_table[baud]; clkmode = clkmode_table[baud]; div = div_table[baud]; reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40); reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */; if (port == 1) { (void)scc.cha_b_ctrl; /* reset reg pointer */ SCCB_WRITE( 9, 0xc0 ); /* reset */ LONG_DELAY(); /* extra delay after WR9 access */ SCCB_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 | 0x04 /* 1 stopbit */ | clkmode ); SCCB_WRITE( 3, reg3 ); SCCB_WRITE( 5, reg5 ); SCCB_WRITE( 9, 0 ); /* no interrupts */ LONG_DELAY(); /* extra delay after WR9 access */ SCCB_WRITE( 10, 0 ); /* NRZ mode */ SCCB_WRITE( 11, clksrc ); /* main clock source */ SCCB_WRITE( 12, div ); /* BRG value */ SCCB_WRITE( 13, 0 ); /* BRG high byte */ SCCB_WRITE( 14, 1 ); SCCB_WRITE( 3, reg3 | 1 ); SCCB_WRITE( 5, reg5 | 8 ); } else if (port == 0) { (void)scc.cha_a_ctrl; /* reset reg pointer */ SCCA_WRITE( 9, 0xc0 ); /* reset */ LONG_DELAY(); /* extra delay after WR9 access */ SCCA_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 | 0x04 /* 1 stopbit */ | clkmode ); SCCA_WRITE( 3, reg3 ); SCCA_WRITE( 5, reg5 ); SCCA_WRITE( 9, 0 ); /* no interrupts */ LONG_DELAY(); /* extra delay after WR9 access */ SCCA_WRITE( 10, 0 ); /* NRZ mode */ SCCA_WRITE( 11, clksrc ); /* main clock source */ SCCA_WRITE( 12, div ); /* BRG value */ SCCA_WRITE( 13, 0 ); /* BRG high byte */ SCCA_WRITE( 14, 1 ); SCCA_WRITE( 3, reg3 | 1 ); SCCA_WRITE( 5, reg5 | 8 ); } mac_SCC_reset_done = 1; mac_SCC_init_done = 1; } #endif /* DEBUG_SERIAL */ void mac_init_scca_port( int cflag ) { mac_init_scc_port(cflag, 0); } void mac_init_sccb_port( int cflag ) { mac_init_scc_port(cflag, 1); } void __init mac_debug_init(void) { #ifdef DEBUG_SERIAL if ( !strcmp( m68k_debug_device, "ser" ) || !strcmp( m68k_debug_device, "ser1" )) { /* Mac modem port */ mac_init_scc_port( B9600|CS8, 0 ); mac_console_driver.write = mac_scca_console_write; scc_port = 0; } else if (!strcmp( m68k_debug_device, "ser2" )) { /* Mac printer port */ mac_init_scc_port( B9600|CS8, 1 ); mac_console_driver.write = mac_sccb_console_write; scc_port = 1; } #endif #ifdef DEBUG_HEADS if ( !strcmp( m68k_debug_device, "scn" ) || !strcmp( m68k_debug_device, "con" )) { /* display, using head.S console routines */ mac_console_driver.write = mac_debug_console_write; } #endif if (mac_console_driver.write) register_console(&mac_console_driver); } /* * Local variables: * c-indent-level: 4 * tab-width: 8 * End: */
