/* * 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 #define BOOTINFO_COMPAT_1_0 #include #include #include extern unsigned long mac_videobase; 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, line; #endif #if 0 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 < 8 * sizeof(short); i++) { /* # of bits */ /* value mask for bit i, reverse order */ *pptr++ = (num & (1 << (8*sizeof(short)-i-1)) ? 0xFF : 0x00); } 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 < 8 * sizeof(long); i++) { /* # of bits */ *pptr++ = (addr & (1 << (8*sizeof(long)-i-1)) ? 0xFF : 0x00); } peng++; if (pos) { line++; peng = 0; } #endif } #endif /* 0 */ #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)) 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. */ static 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; } static 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++); } } static 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) static void __init mac_init_scc_port(int cflag, int port) { /* * 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); } } #endif /* DEBUG_SERIAL */ static int __init mac_debug_setup(char *arg) { if (!MACH_IS_MAC) return 0; #ifdef DEBUG_SERIAL if (!strcmp(arg, "ser") || !strcmp(arg, "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(arg, "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(arg, "scn") || !strcmp(arg, "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); return 0; } early_param("debug", mac_debug_setup);