diff options
Diffstat (limited to 'arch/m68k/mac/debug.c')
| -rw-r--r-- | arch/m68k/mac/debug.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/arch/m68k/mac/debug.c b/arch/m68k/mac/debug.c new file mode 100644 index 000000000000..cc62ed61cda2 --- /dev/null +++ b/arch/m68k/mac/debug.c @@ -0,0 +1,398 @@ +/* + * 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 <linux/config.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/tty.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/delay.h> + +#define BOOTINFO_COMPAT_1_0 +#include <asm/setup.h> +#include <asm/bootinfo.h> +#include <asm/machw.h> +#include <asm/macints.h> + +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<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 +} + +#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; +/* 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; + +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: + */ |
