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Diffstat (limited to 'kernel/arch/m68k/atari/debug.c')
| -rw-r--r-- | kernel/arch/m68k/atari/debug.c | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/kernel/arch/m68k/atari/debug.c b/kernel/arch/m68k/atari/debug.c new file mode 100644 index 000000000..03cb5e08d --- /dev/null +++ b/kernel/arch/m68k/atari/debug.c @@ -0,0 +1,329 @@ +/* + * 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/types.h> +#include <linux/tty.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/module.h> + +#include <asm/atarihw.h> +#include <asm/atariints.h> + +/* 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; +EXPORT_SYMBOL(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 (!(st_mfp.trn_stat & 0x80)) /* wait for tx buf empty */ + barrier(); + st_mfp.usart_dta = c; +} + +static 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 (!(atari_scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */ + MFPDELAY(); + atari_scc.cha_b_data = c; +} + +static 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; +} + +static 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 ((st_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; + } + } +} + +#if 0 +int atari_mfp_console_wait_key(struct console *co) +{ + while (!(st_mfp.rcv_stat & 0x80)) /* wait for rx buf filled */ + barrier(); + return st_mfp.usart_dta; +} + +int atari_scc_console_wait_key(struct console *co) +{ + do { + MFPDELAY(); + } while (!(atari_scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */ + MFPDELAY(); + return atari_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. + */ +static void __init atari_init_mfp_port(int cflag) +{ + /* + * 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 */ + + st_mfp.trn_stat &= ~0x01; /* disable TX */ + st_mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */ + st_mfp.tim_ct_cd &= 0x70; /* stop timer D */ + st_mfp.tim_dt_d = baud_table[baud]; + st_mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */ + st_mfp.trn_stat |= 0x01; /* enable TX */ +} + +#define SCC_WRITE(reg, val) \ + do { \ + atari_scc.cha_b_ctrl = (reg); \ + MFPDELAY(); \ + atari_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) + +static void __init atari_init_scc_port(int cflag) +{ + 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)atari_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; +} + +static void __init atari_init_midi_port(int cflag) +{ + 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); +} + +static int __init atari_debug_setup(char *arg) +{ + bool registered; + + if (!MACH_IS_ATARI) + return 0; + + if (!strcmp(arg, "ser")) + /* defaults to ser2 for a Falcon and ser1 otherwise */ + arg = MACH_IS_FALCON ? "ser2" : "ser1"; + + registered = !!atari_console_driver.write; + if (!strcmp(arg, "ser1")) { + /* ST-MFP Modem1 serial port */ + atari_init_mfp_port(B9600|CS8); + atari_console_driver.write = atari_mfp_console_write; + } else if (!strcmp(arg, "ser2")) { + /* SCC Modem2 serial port */ + atari_init_scc_port(B9600|CS8); + atari_console_driver.write = atari_scc_console_write; + } else if (!strcmp(arg, "midi")) { + /* MIDI port */ + atari_init_midi_port(B9600|CS8); + atari_console_driver.write = atari_midi_console_write; + } else if (!strcmp(arg, "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 && !registered) + register_console(&atari_console_driver); + + return 0; +} + +early_param("debug", atari_debug_setup); |