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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 0int 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);