/* * 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 extern char m68k_debug_device[]; /* Flag that Modem1 port is already initialized and used */ int atari_MFP_init_done; /* Flag that Modem1 port is already initialized and used */ int atari_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 atari_SCC_reset_done; static struct console atari_console_driver = { .name = "debug", .flags = CON_PRINTBUFFER, .index = -1, }; static inline void ata_mfp_out (char c) { while (!(mfp.trn_stat & 0x80)) /* wait for tx buf empty */ barrier (); mfp.usart_dta = c; } void atari_mfp_console_write (struct console *co, const char *str, unsigned int count) { while (count--) { if (*str == '\n') ata_mfp_out( '\r' ); ata_mfp_out( *str++ ); } } static inline void ata_scc_out (char c) { do { MFPDELAY(); } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */ MFPDELAY(); scc.cha_b_data = c; } void atari_scc_console_write (struct console *co, const char *str, unsigned int count) { while (count--) { if (*str == '\n') ata_scc_out( '\r' ); ata_scc_out( *str++ ); } } static inline void ata_midi_out (char c) { while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */ barrier (); acia.mid_data = c; } void atari_midi_console_write (struct console *co, const char *str, unsigned int count) { while (count--) { if (*str == '\n') ata_midi_out( '\r' ); ata_midi_out( *str++ ); } } static int ata_par_out (char c) { unsigned char tmp; /* This a some-seconds timeout in case no printer is connected */ unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ; while( (mfp.par_dt_reg & 1) && --i ) /* wait for BUSY == L */ ; if (!i) return( 0 ); sound_ym.rd_data_reg_sel = 15; /* select port B */ sound_ym.wd_data = c; /* put char onto port */ sound_ym.rd_data_reg_sel = 14; /* select port A */ tmp = sound_ym.rd_data_reg_sel; sound_ym.wd_data = tmp & ~0x20; /* set strobe L */ MFPDELAY(); /* wait a bit */ sound_ym.wd_data = tmp | 0x20; /* set strobe H */ return( 1 ); } static void atari_par_console_write (struct console *co, const char *str, unsigned int count) { static int printer_present = 1; if (!printer_present) return; while (count--) { if (*str == '\n') if (!ata_par_out( '\r' )) { printer_present = 0; return; } if (!ata_par_out( *str++ )) { printer_present = 0; return; } } } #ifdef CONFIG_SERIAL_CONSOLE int atari_mfp_console_wait_key(struct console *co) { while( !(mfp.rcv_stat & 0x80) ) /* wait for rx buf filled */ barrier(); return( mfp.usart_dta ); } int atari_scc_console_wait_key(struct console *co) { do { MFPDELAY(); } while( !(scc.cha_b_ctrl & 0x01) ); /* wait for rx buf filled */ MFPDELAY(); return( scc.cha_b_data ); } int atari_midi_console_wait_key(struct console *co) { while( !(acia.mid_ctrl & ACIA_RDRF) ) /* wait for rx buf filled */ barrier(); return( acia.mid_data ); } #endif /* 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. */ #ifndef CONFIG_SERIAL_CONSOLE static void __init atari_init_mfp_port( int cflag ) #else void atari_init_mfp_port( int cflag ) #endif { /* timer values for 1200...115200 bps; > 38400 select 110, 134, or 150 * bps, resp., and work only correct if there's a RSVE or RSSPEED */ static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 }; int baud = cflag & CBAUD; int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0; int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00; if (cflag & CBAUDEX) baud += B38400; if (baud < B1200 || baud > B38400+2) baud = B9600; /* use default 9600bps for non-implemented rates */ baud -= B1200; /* baud_table[] starts at 1200bps */ mfp.trn_stat &= ~0x01; /* disable TX */ mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */ mfp.tim_ct_cd &= 0x70; /* stop timer D */ mfp.tim_dt_d = baud_table[baud]; mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */ mfp.trn_stat |= 0x01; /* enable TX */ atari_MFP_init_done = 1; } #define SCC_WRITE(reg,val) \ do { \ scc.cha_b_ctrl = (reg); \ MFPDELAY(); \ scc.cha_b_ctrl = (val); \ MFPDELAY(); \ } while(0) /* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a * delay of ~ 60us. */ #define LONG_DELAY() \ do { \ int i; \ for( i = 100; i > 0; --i ) \ MFPDELAY(); \ } while(0) #ifndef CONFIG_SERIAL_CONSOLE static void __init atari_init_scc_port( int cflag ) #else void atari_init_scc_port( int cflag ) #endif { extern int atari_SCC_reset_done; static int clksrc_table[9] = /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */ { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 }; static int brgsrc_table[9] = /* reg 14: 0 = RTxC, 2 = PCLK */ { 2, 2, 2, 2, 2, 2, 0, 2, 2 }; 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) */ { 208, 138, 103, 50, 24, 11, 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]; if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) { /* special treatment for TT, where rates >= 38400 are done via TRxC */ clksrc = 0x28; /* TRxC */ clkmode = baud == 6 ? 0xc0 : baud == 7 ? 0x80 : /* really 76800bps */ 0x40; /* really 153600bps */ div = 0; } reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40; reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */; (void)scc.cha_b_ctrl; /* reset reg pointer */ SCC_WRITE( 9, 0xc0 ); /* reset */ LONG_DELAY(); /* extra delay after WR9 access */ SCC_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 | 0x04 /* 1 stopbit */ | clkmode ); SCC_WRITE( 3, reg3 ); SCC_WRITE( 5, reg5 ); SCC_WRITE( 9, 0 ); /* no interrupts */ LONG_DELAY(); /* extra delay after WR9 access */ SCC_WRITE( 10, 0 ); /* NRZ mode */ SCC_WRITE( 11, clksrc ); /* main clock source */ SCC_WRITE( 12, div ); /* BRG value */ SCC_WRITE( 13, 0 ); /* BRG high byte */ SCC_WRITE( 14, brgsrc_table[baud] ); SCC_WRITE( 14, brgsrc_table[baud] | (div ? 1 : 0) ); SCC_WRITE( 3, reg3 | 1 ); SCC_WRITE( 5, reg5 | 8 ); atari_SCC_reset_done = 1; atari_SCC_init_done = 1; } #ifndef CONFIG_SERIAL_CONSOLE static void __init atari_init_midi_port( int cflag ) #else void atari_init_midi_port( int cflag ) #endif { int baud = cflag & CBAUD; int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00; /* warning 7N1 isn't possible! (instead 7O2 is used...) */ int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04; int div; /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as * default) the standard MIDI speed 31250. */ if (cflag & CBAUDEX) baud += B38400; if (baud == B4800) div = ACIA_DIV64; /* really 7812.5 bps */ else if (baud == B38400+2 /* 115200 */) div = ACIA_DIV1; /* really 500 kbps (does that work??) */ else div = ACIA_DIV16; /* 31250 bps, standard for MIDI */ /* RTS low, ints disabled */ acia.mid_ctrl = div | csize | parity | ((atari_switches & ATARI_SWITCH_MIDI) ? ACIA_RHTID : ACIA_RLTID); } void __init atari_debug_init(void) { if (!strcmp( m68k_debug_device, "ser" )) { /* defaults to ser2 for a Falcon and ser1 otherwise */ strcpy( m68k_debug_device, MACH_IS_FALCON ? "ser2" : "ser1" ); } if (!strcmp( m68k_debug_device, "ser1" )) { /* ST-MFP Modem1 serial port */ atari_init_mfp_port( B9600|CS8 ); atari_console_driver.write = atari_mfp_console_write; } else if (!strcmp( m68k_debug_device, "ser2" )) { /* SCC Modem2 serial port */ atari_init_scc_port( B9600|CS8 ); atari_console_driver.write = atari_scc_console_write; } else if (!strcmp( m68k_debug_device, "midi" )) { /* MIDI port */ atari_init_midi_port( B9600|CS8 ); atari_console_driver.write = atari_midi_console_write; } else if (!strcmp( m68k_debug_device, "par" )) { /* parallel printer */ atari_turnoff_irq( IRQ_MFP_BUSY ); /* avoid ints */ sound_ym.rd_data_reg_sel = 7; /* select mixer control */ sound_ym.wd_data = 0xff; /* sound off, ports are output */ sound_ym.rd_data_reg_sel = 15; /* select port B */ sound_ym.wd_data = 0; /* no char */ sound_ym.rd_data_reg_sel = 14; /* select port A */ sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */ atari_console_driver.write = atari_par_console_write; } if (atari_console_driver.write) register_console(&atari_console_driver); } /* * Local variables: * c-indent-level: 4 * tab-width: 8 * End: */