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2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 | /* $Id: zs.c,v 1.42 1999/05/12 11:15:26 davem Exp $ * zs.c: Zilog serial port driver for the Sparc. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) * Fixes by Pete A. Zaitcev <zaitcev@metabyte.com>. */ #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/config.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/kernel.h> #include <linux/keyboard.h> #include <linux/console.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/sysrq.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/oplib.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/bitops.h> #include <asm/kdebug.h> #include <asm/sbus.h> #ifdef __sparc_v9__ #include <asm/fhc.h> #endif #ifdef CONFIG_PCI #include <linux/pci.h> #endif #include "sunserial.h" #include "zs.h" #include "sunkbd.h" #include "sunmouse.h" static int num_serial = 2; /* sun4/sun4c/sun4m - Two chips on board. */ #define NUM_SERIAL num_serial #define NUM_CHANNELS (NUM_SERIAL * 2) #define KEYBOARD_LINE 0x2 #define MOUSE_LINE 0x3 /* On 32-bit sparcs we need to delay after register accesses * to accomodate sun4 systems, but we do not need to flush writes. * On 64-bit sparc we only need to flush single writes to ensure * completion. */ #ifndef __sparc_v9__ #define ZSDELAY() udelay(5) #define ZSDELAY_LONG() udelay(20) #define ZS_WSYNC(channel) do { } while(0) #else #define ZSDELAY() #define ZSDELAY_LONG() #define ZS_WSYNC(channel) \ ((void) *((volatile unsigned char *)(&((channel)->control)))) #endif struct sun_zslayout **zs_chips; struct sun_zschannel **zs_channels; struct sun_zschannel *zs_mousechan; struct sun_zschannel *zs_kbdchan; struct sun_zschannel *zs_kgdbchan; int *zs_nodes; struct sun_serial *zs_soft; struct sun_serial *zs_chain; /* IRQ servicing chain */ int zilog_irq; struct tty_struct *zs_ttys; /* Console hooks... */ #ifdef CONFIG_SERIAL_CONSOLE static struct console zs_console; static int zs_console_init(void); /* * Define this to get the zs_fair_output() functionality. */ #undef SERIAL_CONSOLE_FAIR_OUTPUT #endif /* CONFIG_SERIAL_CONSOLE */ static unsigned char kgdb_regs[16] = { 0, 0, 0, /* write 0, 1, 2 */ (Rx8 | RxENAB), /* write 3 */ (X16CLK | SB1 | PAR_EVEN), /* write 4 */ (DTR | Tx8 | TxENAB), /* write 5 */ 0, 0, 0, /* write 6, 7, 8 */ (NV), /* write 9 */ (NRZ), /* write 10 */ (TCBR | RCBR), /* write 11 */ 0, 0, /* BRG time constant, write 12 + 13 */ (BRSRC | BRENAB), /* write 14 */ (DCDIE) /* write 15 */ }; static unsigned char zscons_regs[16] = { 0, /* write 0 */ (EXT_INT_ENAB | INT_ALL_Rx), /* write 1 */ 0, /* write 2 */ (Rx8 | RxENAB), /* write 3 */ (X16CLK), /* write 4 */ (DTR | Tx8 | TxENAB), /* write 5 */ 0, 0, 0, /* write 6, 7, 8 */ (NV | MIE), /* write 9 */ (NRZ), /* write 10 */ (TCBR | RCBR), /* write 11 */ 0, 0, /* BRG time constant, write 12 + 13 */ (BRSRC | BRENAB), /* write 14 */ (DCDIE | CTSIE | TxUIE | BRKIE) /* write 15 */ }; #define ZS_CLOCK 4915200 /* Zilog input clock rate */ DECLARE_TASK_QUEUE(tq_serial); static struct tty_driver serial_driver, callout_driver; static int serial_refcount; /* serial subtype definitions */ #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 #define SERIAL_DO_RESTART /* Debugging... DEBUG_INTR is bad to use when one of the zs * lines is your console ;( */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #define RS_STROBE_TIME 10 #define RS_ISR_PASS_LIMIT 256 #define _INLINE_ inline int zs_init(void); static void zs_kgdb_hook(int); static void change_speed(struct sun_serial *info); static struct tty_struct **serial_table; static struct termios **serial_termios; static struct termios **serial_termios_locked; #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /* * tmp_buf is used as a temporary buffer by serial_write. We need to * lock it in case the memcpy_fromfs blocks while swapping in a page, * and some other program tries to do a serial write at the same time. * Since the lock will only come under contention when the system is * swapping and available memory is low, it makes sense to share one * buffer across all the serial ports, since it significantly saves * memory if large numbers of serial ports are open. */ static unsigned char tmp_buf[4096]; /* This is cheating */ static DECLARE_MUTEX(tmp_buf_sem); static inline int serial_paranoia_check(struct sun_serial *info, dev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for serial struct (%d, %d) in %s\n"; static const char *badinfo = "Warning: null sun_serial for (%d, %d) in %s\n"; if (!info) { printk(badinfo, MAJOR(device), MINOR(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, MAJOR(device), MINOR(device), routine); return 1; } #endif return 0; } /* * This is used to figure out the divisor speeds and the timeouts */ static int baud_table[] = { 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 76800, 0 }; /* * Reading and writing Zilog8530 registers. The delays are to make this * driver work on the Sun4 which needs a settling delay after each chip * register access, other machines handle this in hardware via auxiliary * flip-flops which implement the settle time we do in software. */ static inline unsigned char read_zsreg(struct sun_zschannel *channel, unsigned char reg) { unsigned char retval; channel->control = reg; ZSDELAY(); retval = channel->control; ZSDELAY(); return retval; } static inline void write_zsreg(struct sun_zschannel *channel, unsigned char reg, unsigned char value) { channel->control = reg; ZSDELAY(); channel->control = value; ZSDELAY(); } static inline void load_zsregs(struct sun_serial *info, unsigned char *regs) { unsigned long flags; struct sun_zschannel *channel = info->zs_channel; unsigned char stat; int i; for (i = 0; i < 1000; i++) { stat = read_zsreg(channel, R1); if (stat & ALL_SNT) break; udelay(100); } write_zsreg(channel, R3, 0); ZS_CLEARSTAT(channel); ZS_CLEARERR(channel); ZS_CLEARFIFO(channel); /* Load 'em up */ save_flags(flags); cli(); if (info->channelA) write_zsreg(channel, R9, CHRA); else write_zsreg(channel, R9, CHRB); ZSDELAY_LONG(); write_zsreg(channel, R4, regs[R4]); write_zsreg(channel, R3, regs[R3] & ~RxENAB); write_zsreg(channel, R5, regs[R5] & ~TxENAB); write_zsreg(channel, R9, regs[R9] & ~MIE); write_zsreg(channel, R10, regs[R10]); write_zsreg(channel, R11, regs[R11]); write_zsreg(channel, R12, regs[R12]); write_zsreg(channel, R13, regs[R13]); write_zsreg(channel, R14, regs[R14] & ~BRENAB); write_zsreg(channel, R14, regs[R14]); write_zsreg(channel, R14, (regs[R14] & ~SNRZI) | BRENAB); write_zsreg(channel, R3, regs[R3]); write_zsreg(channel, R5, regs[R5]); write_zsreg(channel, R15, regs[R15]); write_zsreg(channel, R0, RES_EXT_INT); write_zsreg(channel, R0, ERR_RES); write_zsreg(channel, R1, regs[R1]); write_zsreg(channel, R9, regs[R9]); restore_flags(flags); } #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */ static inline void zs_put_char(struct sun_zschannel *channel, char ch) { int loops = ZS_PUT_CHAR_MAX_DELAY; /* Do not change this to use ZSDELAY as this is * a timed polling loop and on sparc64 ZSDELAY * is a nop. -DaveM */ while((channel->control & Tx_BUF_EMP) == 0 && --loops) udelay(5); channel->data = ch; ZSDELAY(); ZS_WSYNC(channel); } /* Sets or clears DTR/RTS on the requested line */ static inline void zs_rtsdtr(struct sun_serial *ss, int set) { unsigned long flags; save_flags(flags); cli(); if(set) { ss->curregs[5] |= (RTS | DTR); write_zsreg(ss->zs_channel, 5, ss->curregs[5]); } else { ss->curregs[5] &= ~(RTS | DTR); write_zsreg(ss->zs_channel, 5, ss->curregs[5]); } restore_flags(flags); return; } static inline void kgdb_chaninit(struct sun_serial *ss, int intson, int bps) { int brg; if(intson) { kgdb_regs[R1] = INT_ALL_Rx; kgdb_regs[R9] |= MIE; } else { kgdb_regs[R1] = 0; kgdb_regs[R9] &= ~MIE; } brg = BPS_TO_BRG(bps, ZS_CLOCK/16); kgdb_regs[R12] = (brg & 255); kgdb_regs[R13] = ((brg >> 8) & 255); load_zsregs(ss, kgdb_regs); } /* * ------------------------------------------------------------ * zs_stop() and zs_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. * ------------------------------------------------------------ */ static void zs_stop(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "zs_stop")) return; save_flags(flags); cli(); if (info->curregs[5] & TxENAB) { info->curregs[5] &= ~TxENAB; write_zsreg(info->zs_channel, 5, info->curregs[5]); } restore_flags(flags); } static void zs_start(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "zs_start")) return; save_flags(flags); cli(); if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) { info->curregs[5] |= TxENAB; write_zsreg(info->zs_channel, 5, info->curregs[5]); } restore_flags(flags); } /* Drop into either the boot monitor or kadb upon receiving a break * from keyboard/console input. */ void batten_down_hatches(void) { /* If we are doing kadb, we call the debugger * else we just drop into the boot monitor. * Note that we must flush the user windows * first before giving up control. */ printk("\n"); flush_user_windows(); #ifndef __sparc_v9__ if((((unsigned long)linux_dbvec)>=DEBUG_FIRSTVADDR) && (((unsigned long)linux_dbvec)<=DEBUG_LASTVADDR)) sp_enter_debugger(); else #endif prom_cmdline(); /* XXX We want to notify the keyboard driver that all * XXX keys are in the up state or else weird things * XXX happen... */ return; } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * zs_interrupt(). They were separated out for readability's sake. * * Note: zs_interrupt() is a "fast" interrupt, which means that it * runs with interrupts turned off. People who may want to modify * zs_interrupt() should try to keep the interrupt handler as fast as * possible. After you are done making modifications, it is not a bad * idea to do: * * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c * * and look at the resulting assemble code in serial.s. * * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 * ----------------------------------------------------------------------- */ /* * This routine is used by the interrupt handler to schedule * processing in the software interrupt portion of the driver. */ static _INLINE_ void zs_sched_event(struct sun_serial *info, int event) { info->event |= 1 << event; queue_task(&info->tqueue, &tq_serial); mark_bh(SERIAL_BH); } #ifndef __sparc_v9__ extern void breakpoint(void); /* For the KGDB frame character */ #endif static _INLINE_ void receive_chars(struct sun_serial *info, struct pt_regs *regs) { struct tty_struct *tty = info->tty; unsigned char ch, stat; do { ch = (info->zs_channel->data) & info->parity_mask; ZSDELAY(); /* If this is the console keyboard, we need to handle * L1-A's here. */ if(info->cons_keyb) { if(ch == SUNKBD_RESET) { l1a_state.kbd_id = 1; l1a_state.l1_down = 0; } else if(l1a_state.kbd_id) { l1a_state.kbd_id = 0; } else if(ch == SUNKBD_L1) { l1a_state.l1_down = 1; } else if(ch == (SUNKBD_L1|SUNKBD_UP)) { l1a_state.l1_down = 0; } else if(ch == SUNKBD_A && l1a_state.l1_down) { /* whee... */ batten_down_hatches(); /* Continue execution... */ l1a_state.l1_down = 0; l1a_state.kbd_id = 0; return; } sunkbd_inchar(ch, regs); return; } if(info->cons_mouse) { sun_mouse_inbyte(ch); return; } if(info->is_cons) { if(ch==0) { /* whee, break received */ batten_down_hatches(); /* Continue execution... */ return; } /* It is a 'keyboard interrupt' ;-) */ wake_up(&keypress_wait); } #ifndef __sparc_v9__ /* Look for kgdb 'stop' character, consult the gdb * documentation for remote target debugging and * arch/sparc/kernel/sparc-stub.c to see how all this works. */ if((info->kgdb_channel) && (ch =='\003')) { breakpoint(); return; } #endif if(!tty) return; if (tty->flip.count >= TTY_FLIPBUF_SIZE) break; tty->flip.count++; *tty->flip.flag_buf_ptr++ = 0; *tty->flip.char_buf_ptr++ = ch; /* Check if we have another character... */ stat = info->zs_channel->control; ZSDELAY(); if (!(stat & Rx_CH_AV)) break; /* ... and see if it is clean. */ stat = read_zsreg(info->zs_channel, R1); } while (!(stat & (PAR_ERR | Rx_OVR | CRC_ERR))); queue_task(&tty->flip.tqueue, &tq_timer); } static _INLINE_ void transmit_chars(struct sun_serial *info) { struct tty_struct *tty = info->tty; if (info->x_char) { /* Send next char */ zs_put_char(info->zs_channel, info->x_char); info->x_char = 0; return; } if((info->xmit_cnt <= 0) || (tty != 0 && tty->stopped)) { /* That's peculiar... */ info->zs_channel->control = RES_Tx_P; ZSDELAY(); ZS_WSYNC(info->zs_channel); return; } /* Send char */ zs_put_char(info->zs_channel, info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; if (info->xmit_cnt < WAKEUP_CHARS) zs_sched_event(info, RS_EVENT_WRITE_WAKEUP); if(info->xmit_cnt <= 0) { info->zs_channel->control = RES_Tx_P; ZSDELAY(); ZS_WSYNC(info->zs_channel); } } static _INLINE_ void status_handle(struct sun_serial *info) { unsigned char status; /* Get status from Read Register 0 */ status = info->zs_channel->control; ZSDELAY(); /* Clear status condition... */ info->zs_channel->control = RES_EXT_INT; ZSDELAY(); ZS_WSYNC(info->zs_channel); #if 0 if(status & DCD) { if((info->tty->termios->c_cflag & CRTSCTS) && ((info->curregs[3] & AUTO_ENAB)==0)) { info->curregs[3] |= AUTO_ENAB; write_zsreg(info->zs_channel, 3, info->curregs[3]); } } else { if((info->curregs[3] & AUTO_ENAB)) { info->curregs[3] &= ~AUTO_ENAB; write_zsreg(info->zs_channel, 3, info->curregs[3]); } } #endif /* Whee, if this is console input and this is a * 'break asserted' status change interrupt, call * the boot prom. */ if((status & BRK_ABRT) && info->break_abort) batten_down_hatches(); /* XXX Whee, put in a buffer somewhere, the status information * XXX whee whee whee... Where does the information go... */ return; } static _INLINE_ void special_receive(struct sun_serial *info) { struct tty_struct *tty = info->tty; unsigned char ch, stat; stat = read_zsreg(info->zs_channel, R1); if (stat & (PAR_ERR | Rx_OVR | CRC_ERR)) { ch = info->zs_channel->data; ZSDELAY(); } if (!tty) goto clear; if (tty->flip.count >= TTY_FLIPBUF_SIZE) goto done; tty->flip.count++; if(stat & PAR_ERR) *tty->flip.flag_buf_ptr++ = TTY_PARITY; else if(stat & Rx_OVR) *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; else if(stat & CRC_ERR) *tty->flip.flag_buf_ptr++ = TTY_FRAME; done: queue_task(&tty->flip.tqueue, &tq_timer); clear: info->zs_channel->control = ERR_RES; ZSDELAY(); ZS_WSYNC(info->zs_channel); } /* * This is the serial driver's generic interrupt routine */ void zs_interrupt(int irq, void *dev_id, struct pt_regs * regs) { struct sun_serial *info; unsigned char zs_intreg; int i; info = (struct sun_serial *)dev_id; for (i = 0; i < NUM_SERIAL; i++) { zs_intreg = read_zsreg(info->zs_next->zs_channel, 2); zs_intreg &= STATUS_MASK; /* NOTE: The read register 2, which holds the irq status, * does so for both channels on each chip. Although * the status value itself must be read from the B * channel and is only valid when read from channel B. * When read from channel A, read register 2 contains * the value written to write register 2. */ /* Channel A -- /dev/ttya or /dev/kbd, could be the console */ if (zs_intreg == CHA_Rx_AVAIL) { receive_chars(info, regs); return; } if(zs_intreg == CHA_Tx_EMPTY) { transmit_chars(info); return; } if (zs_intreg == CHA_EXT_STAT) { status_handle(info); return; } if (zs_intreg == CHA_SPECIAL) { special_receive(info); return; } /* Channel B -- /dev/ttyb or /dev/mouse, could be the console */ if(zs_intreg == CHB_Rx_AVAIL) { receive_chars(info->zs_next, regs); return; } if(zs_intreg == CHB_Tx_EMPTY) { transmit_chars(info->zs_next); return; } if (zs_intreg == CHB_EXT_STAT) { status_handle(info->zs_next); return; } /* NOTE: The default value for the IRQ status in read register * 2 in channel B is CHB_SPECIAL, so we need to look at * read register 3 in channel A to check if this is a * real interrupt, or just the default value. * Yes... broken hardware... */ zs_intreg = read_zsreg(info->zs_channel, 3); if (zs_intreg & CHBRxIP) { special_receive(info->zs_next); return; } info = info->zs_next->zs_next; } } /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * This routine is used to handle the "bottom half" processing for the * serial driver, known also the "software interrupt" processing. * This processing is done at the kernel interrupt level, after the * zs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This * is where time-consuming activities which can not be done in the * interrupt driver proper are done; the interrupt driver schedules * them using zs_sched_event(), and they get done here. */ static void do_serial_bh(void) { run_task_queue(&tq_serial); } static void do_softint(void *private_) { struct sun_serial *info = (struct sun_serial *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); } } /* * This routine is called from the scheduler tqueue when the interrupt * routine has signalled that a hangup has occurred. The path of * hangup processing is: * * serial interrupt routine -> (scheduler tqueue) -> * do_serial_hangup() -> tty->hangup() -> zs_hangup() * */ static void do_serial_hangup(void *private_) { struct sun_serial *info = (struct sun_serial *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; #ifdef SERIAL_DEBUG_OPEN printk("do_serial_hangup<%p: tty-%d\n", __builtin_return_address(0), info->line); #endif tty_hangup(tty); } /* * This subroutine is called when the RS_TIMER goes off. It is used * by the serial driver to handle ports that do not have an interrupt * (irq=0). This doesn't work at all for 16450's, as a sun has a Z8530. */ static void zs_timer(void) { printk("zs_timer called\n"); prom_halt(); return; } static int startup(struct sun_serial * info) { unsigned long flags; if (info->flags & ZILOG_INITIALIZED) return 0; if (!info->xmit_buf) { info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL); if (!info->xmit_buf) return -ENOMEM; } save_flags(flags); cli(); #ifdef SERIAL_DEBUG_OPEN printk("Starting up tty-%d (irq %d)...\n", info->line, info->irq); #endif /* * Clear the FIFO buffers and disable them * (they will be reenabled in change_speed()) */ ZS_CLEARFIFO(info->zs_channel); info->xmit_fifo_size = 1; /* * Clear the interrupt registers. */ info->zs_channel->control = ERR_RES; ZSDELAY(); ZS_WSYNC(info->zs_channel); info->zs_channel->control = RES_H_IUS; ZSDELAY(); ZS_WSYNC(info->zs_channel); /* * Now, initialize the Zilog */ zs_rtsdtr(info, 1); /* * Finally, enable sequencing and interrupts */ info->curregs[1] |= (info->curregs[1] & ~(RxINT_MASK)) | (EXT_INT_ENAB | INT_ALL_Rx); info->curregs[3] |= (RxENAB | Rx8); /* We enable Tx interrupts as needed. */ info->curregs[5] |= (TxENAB | Tx8); info->curregs[9] |= (NV | MIE); write_zsreg(info->zs_channel, 3, info->curregs[3]); write_zsreg(info->zs_channel, 5, info->curregs[5]); write_zsreg(info->zs_channel, 9, info->curregs[9]); /* * And clear the interrupt registers again for luck. */ info->zs_channel->control = ERR_RES; ZSDELAY(); ZS_WSYNC(info->zs_channel); info->zs_channel->control = RES_H_IUS; ZSDELAY(); ZS_WSYNC(info->zs_channel); if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * Set up serial timers... */ #if 0 /* Works well and stops the machine. */ timer_table[RS_TIMER].expires = jiffies + 2; timer_active |= 1 << RS_TIMER; #endif /* * and set the speed of the serial port */ change_speed(info); info->flags |= ZILOG_INITIALIZED; restore_flags(flags); return 0; } /* * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void shutdown(struct sun_serial * info) { unsigned long flags; if (!(info->flags & ZILOG_INITIALIZED)) return; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d (irq %d)....", info->line, info->irq); #endif save_flags(flags); cli(); /* Disable interrupts */ if (info->xmit_buf) { free_page((unsigned long) info->xmit_buf); info->xmit_buf = 0; } if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); info->flags &= ~ZILOG_INITIALIZED; restore_flags(flags); } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static void change_speed(struct sun_serial *info) { unsigned short port; unsigned cflag; int quot = 0; int i; int brg; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; if (!(port = info->port)) return; i = cflag & CBAUD; if (cflag & CBAUDEX) { i &= ~CBAUDEX; if (i != 5) info->tty->termios->c_cflag &= ~CBAUDEX; else i = 16; } if (i == 15) { if ((info->flags & ZILOG_SPD_MASK) == ZILOG_SPD_HI) i += 1; if ((info->flags & ZILOG_SPD_MASK) == ZILOG_SPD_CUST) quot = info->custom_divisor; } if (quot) { info->zs_baud = info->baud_base / quot; info->clk_divisor = 16; info->curregs[4] = X16CLK; info->curregs[11] = TCBR | RCBR; brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor); info->curregs[12] = (brg & 255); info->curregs[13] = ((brg >> 8) & 255); info->curregs[14] = BRSRC | BRENAB; zs_rtsdtr(info, 1); } else if (baud_table[i]) { info->zs_baud = baud_table[i]; info->clk_divisor = 16; info->curregs[4] = X16CLK; info->curregs[11] = TCBR | RCBR; brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor); info->curregs[12] = (brg & 255); info->curregs[13] = ((brg >> 8) & 255); info->curregs[14] = BRSRC | BRENAB; zs_rtsdtr(info, 1); } else { zs_rtsdtr(info, 0); return; } /* byte size and parity */ switch (cflag & CSIZE) { case CS5: info->curregs[3] &= ~(RxN_MASK); info->curregs[3] |= Rx5; info->curregs[5] &= ~(TxN_MASK); info->curregs[5] |= Tx5; info->parity_mask = 0x1f; break; case CS6: info->curregs[3] &= ~(RxN_MASK); info->curregs[3] |= Rx6; info->curregs[5] &= ~(TxN_MASK); info->curregs[5] |= Tx6; info->parity_mask = 0x3f; break; case CS7: info->curregs[3] &= ~(RxN_MASK); info->curregs[3] |= Rx7; info->curregs[5] &= ~(TxN_MASK); info->curregs[5] |= Tx7; info->parity_mask = 0x7f; break; case CS8: default: /* defaults to 8 bits */ info->curregs[3] &= ~(RxN_MASK); info->curregs[3] |= Rx8; info->curregs[5] &= ~(TxN_MASK); info->curregs[5] |= Tx8; info->parity_mask = 0xff; break; } info->curregs[4] &= ~(0x0c); if (cflag & CSTOPB) { info->curregs[4] |= SB2; } else { info->curregs[4] |= SB1; } if (cflag & PARENB) { info->curregs[4] |= PAR_ENAB; } else { info->curregs[4] &= ~PAR_ENAB; } if (!(cflag & PARODD)) { info->curregs[4] |= PAR_EVEN; } else { info->curregs[4] &= ~PAR_EVEN; } /* Load up the new values */ load_zsregs(info, info->curregs); return; } /* This is for mouse/keyboard output. * XXX mouse output??? can we send it commands??? XXX */ static void kbd_put_char(unsigned char ch) { struct sun_zschannel *chan = zs_kbdchan; unsigned long flags; if(!chan) return; save_flags(flags); cli(); zs_put_char(chan, ch); restore_flags(flags); } void mouse_put_char(char ch) { struct sun_zschannel *chan = zs_mousechan; unsigned long flags; if(!chan) return; save_flags(flags); cli(); zs_put_char(chan, ch); restore_flags(flags); } /* These are for receiving and sending characters under the kgdb * source level kernel debugger. */ void putDebugChar(char kgdb_char) { struct sun_zschannel *chan = zs_kgdbchan; while((chan->control & Tx_BUF_EMP)==0) udelay(5); chan->data = kgdb_char; ZS_WSYNC(chan); } char getDebugChar(void) { struct sun_zschannel *chan = zs_kgdbchan; while((chan->control & Rx_CH_AV)==0) udelay(5); return chan->data; } static void zs_flush_chars(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "zs_flush_chars")) return; save_flags(flags); cli(); if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !info->xmit_buf) goto out; /* Enable transmitter */ info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB; write_zsreg(info->zs_channel, 1, info->curregs[1]); info->curregs[5] |= TxENAB; write_zsreg(info->zs_channel, 5, info->curregs[5]); /* * Send a first (bootstrapping) character. A best solution is * to call transmit_chars() here which handles output in a * generic way. Current transmit_chars() not only transmits, * but resets interrupts also what we do not desire here. * XXX Discuss with David. */ zs_put_char(info->zs_channel, info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; out: restore_flags(flags); } static int zs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, total = 0; struct sun_serial *info = (struct sun_serial *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "zs_write")) return 0; if (!info || !info->xmit_buf) return 0; save_flags(flags); while (1) { cli(); c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) break; if (from_user) { down(&tmp_buf_sem); copy_from_user(tmp_buf, buf, c); c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); up(&tmp_buf_sem); } else memcpy(info->xmit_buf + info->xmit_head, buf, c); info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; total += c; } cli(); if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { /* Enable transmitter */ info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB; write_zsreg(info->zs_channel, 1, info->curregs[1]); info->curregs[5] |= TxENAB; write_zsreg(info->zs_channel, 5, info->curregs[5]); #if 1 zs_put_char(info->zs_channel, info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; #endif } restore_flags(flags); return total; } static int zs_write_room(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; int ret; if (serial_paranoia_check(info, tty->device, "zs_write_room")) return 0; ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; if (ret < 0) ret = 0; return ret; } static int zs_chars_in_buffer(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "zs_chars_in_buffer")) return 0; return info->xmit_cnt; } static void zs_flush_buffer(struct tty_struct *tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "zs_flush_buffer")) return; cli(); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; sti(); wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * ------------------------------------------------------------ * zs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void zs_throttle(struct tty_struct * tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("throttle %s: %d....\n", _tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "zs_throttle")) return; if (I_IXOFF(tty)) info->x_char = STOP_CHAR(tty); /* Turn off RTS line */ cli(); info->curregs[5] &= ~RTS; write_zsreg(info->zs_channel, 5, info->curregs[5]); sti(); } static void zs_unthrottle(struct tty_struct * tty) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("unthrottle %s: %d....\n", _tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "zs_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else info->x_char = START_CHAR(tty); } /* Assert RTS line */ cli(); info->curregs[5] |= RTS; write_zsreg(info->zs_channel, 5, info->curregs[5]); sti(); } /* * ------------------------------------------------------------ * zs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct sun_serial * info, struct serial_struct * retinfo) { struct serial_struct tmp; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tmp.type = info->type; tmp.line = info->line; tmp.port = info->port; tmp.irq = info->irq; tmp.flags = info->flags; tmp.baud_base = info->baud_base; tmp.close_delay = info->close_delay; tmp.closing_wait = info->closing_wait; tmp.custom_divisor = info->custom_divisor; copy_to_user_ret(retinfo,&tmp,sizeof(*retinfo), -EFAULT); return 0; } static int set_serial_info(struct sun_serial * info, struct serial_struct * new_info) { struct serial_struct new_serial; struct sun_serial old_info; int retval = 0; if (!new_info || copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; old_info = *info; if (!capable(CAP_SYS_ADMIN)) { if ((new_serial.baud_base != info->baud_base) || (new_serial.type != info->type) || (new_serial.close_delay != info->close_delay) || ((new_serial.flags & ~ZILOG_USR_MASK) != (info->flags & ~ZILOG_USR_MASK))) return -EPERM; info->flags = ((info->flags & ~ZILOG_USR_MASK) | (new_serial.flags & ZILOG_USR_MASK)); info->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } if(new_serial.baud_base < 9600) return -EINVAL; if (info->count > 1) return -EBUSY; /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ info->baud_base = new_serial.baud_base; info->flags = ((info->flags & ~ZILOG_FLAGS) | (new_serial.flags & ZILOG_FLAGS)); info->custom_divisor = new_serial.custom_divisor; info->type = new_serial.type; info->close_delay = new_serial.close_delay; info->closing_wait = new_serial.closing_wait; check_and_exit: retval = startup(info); return retval; } /* * get_lsr_info - get line status register info * * Purpose: Let user call ioctl() to get info when the UART physically * is emptied. On bus types like RS485, the transmitter must * release the bus after transmitting. This must be done when * the transmit shift register is empty, not be done when the * transmit holding register is empty. This functionality * allows an RS485 driver to be written in user space. */ static int get_lsr_info(struct sun_serial * info, unsigned int *value) { unsigned char status; cli(); status = info->zs_channel->control; ZSDELAY(); sti(); put_user_ret(status,value, -EFAULT); return 0; } static int get_modem_info(struct sun_serial * info, unsigned int *value) { unsigned char status; unsigned int result; cli(); status = info->zs_channel->control; ZSDELAY(); sti(); result = ((info->curregs[5] & RTS) ? TIOCM_RTS : 0) | ((info->curregs[5] & DTR) ? TIOCM_DTR : 0) | ((status & DCD) ? TIOCM_CAR : 0) | ((status & SYNC) ? TIOCM_DSR : 0) | ((status & CTS) ? TIOCM_CTS : 0); put_user_ret(result, value, -EFAULT); return 0; } static int set_modem_info(struct sun_serial * info, unsigned int cmd, unsigned int *value) { unsigned int arg; get_user_ret(arg, value, -EFAULT); switch (cmd) { case TIOCMBIS: if (arg & TIOCM_RTS) info->curregs[5] |= RTS; if (arg & TIOCM_DTR) info->curregs[5] |= DTR; break; case TIOCMBIC: if (arg & TIOCM_RTS) info->curregs[5] &= ~RTS; if (arg & TIOCM_DTR) info->curregs[5] &= ~DTR; break; case TIOCMSET: info->curregs[5] = ((info->curregs[5] & ~(RTS | DTR)) | ((arg & TIOCM_RTS) ? RTS : 0) | ((arg & TIOCM_DTR) ? DTR : 0)); break; default: return -EINVAL; } cli(); write_zsreg(info->zs_channel, 5, info->curregs[5]); sti(); return 0; } /* * This routine sends a break character out the serial port. */ static void send_break( struct sun_serial * info, int duration) { if (!info->port) return; current->state = TASK_INTERRUPTIBLE; cli(); write_zsreg(info->zs_channel, 5, (info->curregs[5] | SND_BRK)); schedule_timeout(duration); write_zsreg(info->zs_channel, 5, info->curregs[5]); sti(); } static int zs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { struct sun_serial * info = (struct sun_serial *)tty->driver_data; int retval; if (serial_paranoia_check(info, tty->device, "zs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } switch (cmd) { case TCSBRK: /* SVID version: non-zero arg --> no break */ retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); if (!arg) send_break(info, HZ/4); /* 1/4 second */ return 0; case TCSBRKP: /* support for POSIX tcsendbreak() */ retval = tty_check_change(tty); if (retval) return retval; tty_wait_until_sent(tty, 0); send_break(info, arg ? arg*(HZ/10) : HZ/4); return 0; case TIOCGSOFTCAR: put_user_ret(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg, -EFAULT); return 0; case TIOCSSOFTCAR: get_user_ret(arg, (unsigned long *) arg, -EFAULT); tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0)); return 0; case TIOCMGET: return get_modem_info(info, (unsigned int *) arg); case TIOCMBIS: case TIOCMBIC: case TIOCMSET: return set_modem_info(info, cmd, (unsigned int *) arg); case TIOCGSERIAL: return get_serial_info(info, (struct serial_struct *) arg); case TIOCSSERIAL: return set_serial_info(info, (struct serial_struct *) arg); case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, (unsigned int *) arg); case TIOCSERGSTRUCT: copy_to_user_ret((struct sun_serial *) arg, info, sizeof(struct sun_serial), -EFAULT); return 0; default: return -ENOIOCTLCMD; } return 0; } static void zs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct sun_serial *info = (struct sun_serial *)tty->driver_data; if (tty->termios->c_cflag == old_termios->c_cflag) return; change_speed(info); if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; zs_start(tty); } } /* * ------------------------------------------------------------ * zs_close() * * This routine is called when the serial port gets closed. First, we * wait for the last remaining data to be sent. Then, we unlink its * ZILOG structure from the interrupt chain if necessary, and we free * that IRQ if nothing is left in the chain. * ------------------------------------------------------------ */ static void zs_close(struct tty_struct *tty, struct file * filp) { struct sun_serial * info = (struct sun_serial *)tty->driver_data; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "zs_close")) return; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { restore_flags(flags); return; } #ifdef SERIAL_DEBUG_OPEN printk("zs_close tty-%d, count = %d\n", info->line, info->count); #endif if ((tty->count == 1) && (info->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. Info->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk("zs_close: bad serial port count; tty->count is 1, " "info->count is %d\n", info->count); info->count = 1; } if (--info->count < 0) { printk("zs_close: bad serial port count for ttys%d: %d\n", info->line, info->count); info->count = 0; } if (info->count) { restore_flags(flags); return; } info->flags |= ZILOG_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ZILOG_NORMAL_ACTIVE) info->normal_termios = *tty->termios; if (info->flags & ZILOG_CALLOUT_ACTIVE) info->callout_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->closing_wait); /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ /** if (!info->iscons) ... **/ info->curregs[3] &= ~RxENAB; write_zsreg(info->zs_channel, 3, info->curregs[3]); info->curregs[1] &= ~(RxINT_MASK); write_zsreg(info->zs_channel, 1, info->curregs[1]); ZS_CLEARFIFO(info->zs_channel); shutdown(info); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (tty->ldisc.num != ldiscs[N_TTY].num) { if (tty->ldisc.close) (tty->ldisc.close)(tty); tty->ldisc = ldiscs[N_TTY]; tty->termios->c_line = N_TTY; if (tty->ldisc.open) (tty->ldisc.open)(tty); } if (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE| ZILOG_CLOSING); wake_up_interruptible(&info->close_wait); #ifdef SERIAL_DEBUG_OPEN printk("zs_close tty-%d exiting, count = %d\n", info->line, info->count); #endif restore_flags(flags); } /* * zs_hangup() --- called by tty_hangup() when a hangup is signaled. */ void zs_hangup(struct tty_struct *tty) { struct sun_serial * info = (struct sun_serial *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "zs_hangup")) return; if (info->is_cons) return; #ifdef SERIAL_DEBUG_OPEN printk("zs_hangup<%p: tty-%d, count = %d bye\n", __builtin_return_address(0), info->line, info->count); #endif zs_flush_buffer(tty); shutdown(info); info->event = 0; info->count = 0; info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * zs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct sun_serial *info) { DECLARE_WAITQUEUE(wait, current); int retval; int do_clocal = 0; unsigned char r0; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (info->flags & ZILOG_CLOSING) { interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART if (info->flags & ZILOG_HUP_NOTIFY) return -EAGAIN; else return -ERESTARTSYS; #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & ZILOG_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ZILOG_CALLOUT_ACTIVE) && (info->flags & ZILOG_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ZILOG_CALLOUT_ACTIVE) && (info->flags & ZILOG_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ZILOG_CALLOUT_ACTIVE; return 0; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { if (info->flags & ZILOG_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ZILOG_NORMAL_ACTIVE; return 0; } if (info->flags & ZILOG_CALLOUT_ACTIVE) { if (info->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; } /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, info->count is dropped by one, so that * zs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready before block: ttys%d, count = %d\n", info->line, info->count); #endif cli(); if(!tty_hung_up_p(filp)) info->count--; sti(); info->blocked_open++; while (1) { cli(); if (!(info->flags & ZILOG_CALLOUT_ACTIVE)) zs_rtsdtr(info, 1); sti(); current->state = TASK_INTERRUPTIBLE; if (tty_hung_up_p(filp) || !(info->flags & ZILOG_INITIALIZED)) { #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready hup-ed: ttys%d, count = %d\n", info->line, info->count); #endif #ifdef SERIAL_DO_RESTART if (info->flags & ZILOG_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } cli(); r0 = read_zsreg(info->zs_channel, R0); sti(); if (!(info->flags & ZILOG_CALLOUT_ACTIVE) && !(info->flags & ZILOG_CLOSING) && (do_clocal || (DCD & r0))) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready blocking: ttys%d, count = %d\n", info->line, info->count); #endif schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (!tty_hung_up_p(filp)) info->count++; info->blocked_open--; #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready after blocking: ttys%d, count = %d\n", info->line, info->count); #endif if (retval) return retval; info->flags |= ZILOG_NORMAL_ACTIVE; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its ZILOG structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ int zs_open(struct tty_struct *tty, struct file * filp) { struct sun_serial *info; int retval, line; line = MINOR(tty->device) - tty->driver.minor_start; /* The zilog lines for the mouse/keyboard must be * opened using their respective drivers. */ if ((line < 0) || (line >= NUM_CHANNELS)) return -ENODEV; if((line == KEYBOARD_LINE) || (line == MOUSE_LINE)) return -ENODEV; info = zs_soft + line; /* Is the kgdb running over this line? */ if (info->kgdb_channel) return -ENODEV; if (serial_paranoia_check(info, tty->device, "zs_open")) return -ENODEV; #ifdef SERIAL_DEBUG_OPEN printk("zs_open %s%d, count = %d\n", tty->driver.name, info->line, info->count); #endif if (info->tty != 0 && info->tty != tty) { /* Never happen? */ printk("zs_open %s%d, tty overwrite.\n", tty->driver.name, info->line); return -EBUSY; } info->count++; tty->driver_data = info; info->tty = tty; /* * Start up serial port */ retval = startup(info); if (retval) return retval; retval = block_til_ready(tty, filp, info); if (retval) { #ifdef SERIAL_DEBUG_OPEN printk("zs_open returning after block_til_ready with %d\n", retval); #endif return retval; } if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->normal_termios; else *tty->termios = info->callout_termios; change_speed(info); } #ifdef CONFIG_SERIAL_CONSOLE if (zs_console.cflag && zs_console.index == line) { tty->termios->c_cflag = zs_console.cflag; zs_console.cflag = 0; change_speed(info); } #endif info->session = current->session; info->pgrp = current->pgrp; #ifdef SERIAL_DEBUG_OPEN printk("zs_open ttys%d successful...", info->line); #endif return 0; } /* Finally, routines used to initialize the serial driver. */ static void show_serial_version(void) { char *revision = "$Revision: 1.42 $"; char *version, *p; version = strchr(revision, ' '); p = strchr(++version, ' '); *p = '\0'; printk("Sparc Zilog8530 serial driver version %s\n", version); *p = ' '; } /* Probe the PROM for the request zs chip number. * * Note: The Sun Voyager shows two addresses and two intr for it's * Zilogs, what the second does, I don't know. It does work * with using only the first number of each property. Also * we have a special version for sun4u. */ #ifdef __sparc_v9__ __initfunc(static struct sun_zslayout * get_zs(int chip)) { unsigned int vaddr[2] = { 0, 0 }; unsigned long mapped_addr = 0; int busnode, seen, zsnode, sun4u_ino; static int irq = 0; if(chip < 0 || chip >= NUM_SERIAL) panic("get_zs bogon zs chip number"); if(central_bus) busnode = central_bus->child->prom_node; else busnode = prom_searchsiblings(prom_getchild(prom_root_node), "sbus"); if(busnode == 0 || busnode == -1) panic("get_zs: no zs bus to search"); zsnode = prom_getchild(busnode); seen = 0; while(zsnode) { int slave; zsnode = prom_searchsiblings(zsnode, "zs"); slave = prom_getintdefault(zsnode, "slave", -1); if((slave == chip) || (seen == chip)) { int len = prom_getproperty(zsnode, "address", (void *) vaddr, sizeof(vaddr)); if(len == -1 || central_bus != NULL) { struct linux_sbus *sbus = NULL; struct linux_sbus_device *sdev = NULL; /* "address" property is not guarenteed, * everything in I/O is implicitly mapped * anyways by our clever TLB miss handling * scheme, so don't fail here. -DaveM */ if (central_bus == NULL) { for_each_sbus(sbus) { for_each_sbusdev(sdev, sbus) { if (sdev->prom_node == zsnode) goto found; } } } found: if (sdev == NULL && central_bus == NULL) prom_halt(); if (central_bus == NULL) { prom_apply_sbus_ranges(sbus, sdev->reg_addrs, 1, sdev); mapped_addr = (unsigned long) sparc_alloc_io(sdev->reg_addrs[0].phys_addr, 0, PAGE_SIZE, "Zilog Registers", sdev->reg_addrs[0].which_io, 0x0); } else { struct linux_prom_registers zsregs[1]; int err; err = prom_getproperty(zsnode, "reg", (char *)&zsregs[0], sizeof(zsregs)); if (err == -1) { prom_printf("ZS: Cannot map Zilog regs.\n"); prom_halt(); } prom_apply_fhc_ranges(central_bus->child, &zsregs[0], 1); prom_apply_central_ranges(central_bus, &zsregs[0], 1); mapped_addr = (unsigned long) __va((((unsigned long)zsregs[0].which_io)<<32) | (((unsigned long)zsregs[0].phys_addr))); } } else if(len % sizeof(unsigned int)) { prom_printf("WHOOPS: proplen for %s " "was %d, need multiple of " "%d\n", "address", len, sizeof(unsigned int)); panic("zilog: address property"); } zs_nodes[chip] = zsnode; len = prom_getproperty(zsnode, "interrupts", (char *) &sun4u_ino, (sizeof(sun4u_ino))); if(!irq) { if (central_bus) { irq = zilog_irq = build_irq(12, 0, ¢ral_bus->child->fhc_regs.uregs->fhc_uart_iclr, ¢ral_bus->child->fhc_regs.uregs->fhc_uart_imap); } else { irq = zilog_irq = sbus_build_irq(SBus_chain, sun4u_ino); } } break; } zsnode = prom_getsibling(zsnode); seen++; } if(!zsnode) panic("get_zs: whee chip not found"); if(!vaddr[0] && !mapped_addr) panic("get_zs: whee no serial chip mappable"); if (mapped_addr != 0) return (struct sun_zslayout *) mapped_addr; else return (struct sun_zslayout *) (unsigned long) vaddr[0]; } #else /* !(__sparc_v9__) */ __initfunc(static struct sun_zslayout * get_zs(int chip)) { struct linux_prom_irqs tmp_irq[2]; unsigned int paddr = 0; unsigned int vaddr[2] = { 0, 0 }; int zsnode, tmpnode, iospace, slave, len; int cpunode = 0, bbnode = 0; static int irq = 0; int chipid = chip; #if CONFIG_AP1000 printk("No zs chip\n"); return NULL; #endif iospace = 0; if(chip < 0 || chip >= NUM_SERIAL) panic("get_zs bogon zs chip number"); if(sparc_cpu_model == sun4) { /* Grrr, these have to be hardcoded aieee */ switch(chip) { case 0: paddr = 0xf1000000; break; case 1: paddr = 0xf0000000; break; }; iospace = 0; zs_nodes[chip] = 0; if(!irq) zilog_irq = irq = 12; vaddr[0] = (unsigned long) sparc_alloc_io(paddr, 0, 8, "Zilog Serial", iospace, 0); } else { /* Can use the prom for other machine types */ zsnode = prom_getchild(prom_root_node); if (sparc_cpu_model == sun4d) { int node; int no = 0; tmpnode = zsnode; zsnode = 0; bbnode = 0; while (tmpnode && (tmpnode = prom_searchsiblings(tmpnode, "cpu-unit"))) { bbnode = prom_getchild(tmpnode); if (bbnode && (bbnode = prom_searchsiblings(bbnode, "bootbus"))) { if (no == (chip >> 1)) { cpunode = tmpnode; zsnode = prom_getchild(bbnode); chipid = (chip & 1); break; } no++; } tmpnode = prom_getsibling(tmpnode); } if (!tmpnode) panic ("get_zs: couldn't find %dth bootbus\n", chip >> 1); } else { tmpnode = prom_searchsiblings(zsnode, "obio"); if(tmpnode) zsnode = prom_getchild(tmpnode); } if(!zsnode) panic("get_zs no zs serial prom node"); while(zsnode) { zsnode = prom_searchsiblings(zsnode, "zs"); slave = prom_getintdefault(zsnode, "slave", -1); if(slave == chipid) { /* The one we want */ if (sparc_cpu_model != sun4d) { len = prom_getproperty(zsnode, "address", (void *) vaddr, sizeof(vaddr)); if (len % sizeof(unsigned int)) { prom_printf("WHOOPS: proplen for %s " "was %d, need multiple of " "%d\n", "address", len, sizeof(unsigned int)); panic("zilog: address property"); } } else { /* On sun4d don't have address property :( */ struct linux_prom_registers zsreg[4]; if (prom_getproperty(zsnode, "reg", (char *)zsreg, sizeof(zsreg)) == -1) { prom_printf ("Cannot map zs regs\n"); prom_halt(); } prom_apply_generic_ranges(bbnode, cpunode, zsreg, 1); vaddr[0] = (unsigned long) sparc_alloc_io(zsreg[0].phys_addr, 0, 8, "Zilog Serial", zsreg[0].which_io, 0); } zs_nodes[chip] = zsnode; len = prom_getproperty(zsnode, "intr", (char *) tmp_irq, sizeof(tmp_irq)); if (len % sizeof(struct linux_prom_irqs)) { prom_printf( "WHOOPS: proplen for %s " "was %d, need multiple of " "%d\n", "address", len, sizeof(struct linux_prom_irqs)); panic("zilog: address property"); } if(!irq) { irq = zilog_irq = tmp_irq[0].pri; } else { if(tmp_irq[0].pri != irq) panic("zilog: bogon irqs"); } break; } zsnode = prom_getsibling(zsnode); } if(!zsnode) panic("get_zs whee chip not found"); } if(!vaddr[0]) panic("get_zs whee no serial chip mappable"); return (struct sun_zslayout *)(unsigned long) vaddr[0]; } #endif /* This is for the auto baud rate detection in the mouse driver. */ void zs_change_mouse_baud(int newbaud) { int channel = MOUSE_LINE; int brg; zs_soft[channel].zs_baud = newbaud; brg = BPS_TO_BRG(zs_soft[channel].zs_baud, (ZS_CLOCK / zs_soft[channel].clk_divisor)); write_zsreg(zs_soft[channel].zs_channel, R12, (brg & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R13, ((brg >> 8) & 0xff)); } __initfunc(int zs_probe (unsigned long *memory_start)) { char *p; int node; int i; if(sparc_cpu_model == sun4) goto no_probe; NUM_SERIAL = 0; node = prom_getchild(prom_root_node); if (sparc_cpu_model == sun4d) { int bbnode; while (node && (node = prom_searchsiblings(node, "cpu-unit"))) { bbnode = prom_getchild(node); if (bbnode && prom_searchsiblings(bbnode, "bootbus")) NUM_SERIAL += 2; node = prom_getsibling(node); } goto no_probe; } #ifdef __sparc_v9__ else if (sparc_cpu_model == sun4u) { int central_node; /* Central bus zilogs must be checked for first, * since Enterprise boxes might have SBUSes as well. */ central_node = prom_finddevice("/central"); if(central_node != 0 && central_node != -1) node = prom_searchsiblings(prom_getchild(central_node), "fhc"); else node = prom_searchsiblings(node, "sbus"); if(node != 0 && node != -1) node = prom_getchild(node); if(node == 0 || node == -1) return -ENODEV; } #endif /* __sparc_v9__ */ else { node = prom_searchsiblings(node, "obio"); if(node) node = prom_getchild(node); NUM_SERIAL = 2; goto no_probe; } node = prom_searchsiblings(node, "zs"); if (!node) return -ENODEV; NUM_SERIAL = 2; no_probe: p = (char *)((*memory_start + 7) & ~7); zs_chips = (struct sun_zslayout **)(p); i = NUM_SERIAL * sizeof (struct sun_zslayout *); zs_channels = (struct sun_zschannel **)(p + i); i += NUM_CHANNELS * sizeof (struct sun_zschannel *); zs_nodes = (int *)(p + i); i += NUM_SERIAL * sizeof (int); zs_soft = (struct sun_serial *)(p + i); i += NUM_CHANNELS * sizeof (struct sun_serial); zs_ttys = (struct tty_struct *)(p + i); i += NUM_CHANNELS * sizeof (struct tty_struct); serial_table = (struct tty_struct **)(p + i); i += NUM_CHANNELS * sizeof (struct tty_struct *); serial_termios = (struct termios **)(p + i); i += NUM_CHANNELS * sizeof (struct termios *); serial_termios_locked = (struct termios **)(p + i); i += NUM_CHANNELS * sizeof (struct termios *); memset (p, 0, i); *memory_start = (((unsigned long)p) + i + 7) & ~7; /* Fill in rs_ops struct... */ #ifdef CONFIG_SERIAL_CONSOLE sunserial_setinitfunc(memory_start, zs_console_init); #endif sunserial_setinitfunc(memory_start, zs_init); rs_ops.rs_kgdb_hook = zs_kgdb_hook; rs_ops.rs_change_mouse_baud = zs_change_mouse_baud; sunkbd_setinitfunc(memory_start, sun_kbd_init); kbd_ops.compute_shiftstate = sun_compute_shiftstate; kbd_ops.setledstate = sun_setledstate; kbd_ops.getledstate = sun_getledstate; kbd_ops.setkeycode = sun_setkeycode; kbd_ops.getkeycode = sun_getkeycode; #if defined(__sparc_v9__) && defined(CONFIG_PCI) sunkbd_install_keymaps(memory_start, sun_key_maps, sun_keymap_count, sun_func_buf, sun_func_table, sun_funcbufsize, sun_funcbufleft, sun_accent_table, sun_accent_table_size); #endif return 0; } static inline void zs_prepare(void) { int channel, chip; unsigned long flags; if (!NUM_SERIAL) return; save_and_cli(flags); /* Set up our interrupt linked list */ zs_chain = &zs_soft[0]; for(channel = 0; channel < NUM_CHANNELS - 1; channel++) { zs_soft[channel].zs_next = &zs_soft[channel + 1]; zs_soft[channel].line = channel; } zs_soft[channel].zs_next = 0; /* Initialize Softinfo */ for(chip = 0; chip < NUM_SERIAL; chip++) { /* If we are doing kgdb over one of the channels on * chip zero, kgdb_channel will be set to 1 by the * zs_kgdb_hook() routine below. */ if(!zs_chips[chip]) { zs_chips[chip] = get_zs(chip); /* Two channels per chip */ zs_channels[(chip*2)] = &zs_chips[chip]->channelA; zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB; zs_soft[(chip*2)].kgdb_channel = 0; zs_soft[(chip*2)+1].kgdb_channel = 0; } /* First, set up channel A on this chip. */ channel = chip * 2; zs_soft[channel].zs_channel = zs_channels[channel]; zs_soft[channel].change_needed = 0; zs_soft[channel].clk_divisor = 16; zs_soft[channel].cons_keyb = 0; zs_soft[channel].cons_mouse = 0; zs_soft[channel].channelA = 1; /* Now, channel B */ channel++; zs_soft[channel].zs_channel = zs_channels[channel]; zs_soft[channel].change_needed = 0; zs_soft[channel].clk_divisor = 16; zs_soft[channel].cons_keyb = 0; zs_soft[channel].cons_mouse = 0; zs_soft[channel].channelA = 0; } restore_flags(flags); } __initfunc(int zs_init(void)) { int channel, brg, i; unsigned long flags; struct sun_serial *info; char dummy; #if CONFIG_AP1000 printk("not doing zs_init()\n"); return 0; #endif /* Setup base handler, and timer table. */ init_bh(SERIAL_BH, do_serial_bh); timer_table[RS_TIMER].fn = zs_timer; timer_table[RS_TIMER].expires = 0; show_serial_version(); /* Initialize the tty_driver structure */ /* SPARC: Not all of this is exactly right for us. */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.driver_name = "serial"; serial_driver.name = "ttyS"; serial_driver.major = TTY_MAJOR; serial_driver.minor_start = 64; serial_driver.num = NUM_CHANNELS; serial_driver.type = TTY_DRIVER_TYPE_SERIAL; serial_driver.subtype = SERIAL_TYPE_NORMAL; serial_driver.init_termios = tty_std_termios; serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; serial_driver.flags = TTY_DRIVER_REAL_RAW; serial_driver.refcount = &serial_refcount; serial_driver.table = serial_table; serial_driver.termios = serial_termios; serial_driver.termios_locked = serial_termios_locked; serial_driver.open = zs_open; serial_driver.close = zs_close; serial_driver.write = zs_write; serial_driver.flush_chars = zs_flush_chars; serial_driver.write_room = zs_write_room; serial_driver.chars_in_buffer = zs_chars_in_buffer; serial_driver.flush_buffer = zs_flush_buffer; serial_driver.ioctl = zs_ioctl; serial_driver.throttle = zs_throttle; serial_driver.unthrottle = zs_unthrottle; serial_driver.set_termios = zs_set_termios; serial_driver.stop = zs_stop; serial_driver.start = zs_start; serial_driver.hangup = zs_hangup; /* I'm too lazy, someone write versions of this for us. -DaveM */ serial_driver.read_proc = 0; serial_driver.proc_entry = 0; /* * The callout device is just like normal device except for * major number and the subtype code. */ callout_driver = serial_driver; callout_driver.name = "cua"; callout_driver.major = TTYAUX_MAJOR; callout_driver.subtype = SERIAL_TYPE_CALLOUT; if (tty_register_driver(&serial_driver)) panic("Couldn't register serial driver\n"); if (tty_register_driver(&callout_driver)) panic("Couldn't register callout driver\n"); save_flags(flags); cli(); /* Initialize Softinfo */ zs_prepare(); /* Grab IRQ line before poking the chips so we do * not lose any interrupts. */ if (request_irq(zilog_irq, zs_interrupt, (SA_INTERRUPT | SA_STATIC_ALLOC), "Zilog8530", zs_chain)) panic("Unable to attach zs intr\n"); /* Initialize Hardware */ for(channel = 0; channel < NUM_CHANNELS; channel++) { /* Hardware reset each chip */ if (!(channel & 1)) { write_zsreg(zs_soft[channel].zs_channel, R9, FHWRES); ZSDELAY_LONG(); dummy = read_zsreg(zs_soft[channel].zs_channel, R0); } if(channel == KEYBOARD_LINE) { zs_soft[channel].cons_keyb = 1; zs_soft[channel].parity_mask = 0xff; zs_kbdchan = zs_soft[channel].zs_channel; write_zsreg(zs_soft[channel].zs_channel, R4, (PAR_EVEN | X16CLK | SB1)); write_zsreg(zs_soft[channel].zs_channel, R3, Rx8); write_zsreg(zs_soft[channel].zs_channel, R5, Tx8); write_zsreg(zs_soft[channel].zs_channel, R9, NV); write_zsreg(zs_soft[channel].zs_channel, R10, NRZ); write_zsreg(zs_soft[channel].zs_channel, R11, (TCBR | RCBR)); zs_soft[channel].zs_baud = 1200; brg = BPS_TO_BRG(zs_soft[channel].zs_baud, ZS_CLOCK/zs_soft[channel].clk_divisor); write_zsreg(zs_soft[channel].zs_channel, R12, (brg & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R13, ((brg >> 8) & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC); /* Enable Rx/Tx, IRQs, and inform kbd driver */ write_zsreg(zs_soft[channel].zs_channel, R14, (BRSRC | BRENAB)); write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8 | RxENAB)); write_zsreg(zs_soft[channel].zs_channel, R5, (Tx8 | TxENAB | DTR | RTS)); write_zsreg(zs_soft[channel].zs_channel, R15, (DCDIE | CTSIE | TxUIE | BRKIE)); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); write_zsreg(zs_soft[channel].zs_channel, R1, (EXT_INT_ENAB | INT_ALL_Rx)); write_zsreg(zs_soft[channel].zs_channel, R9, (NV | MIE)); ZS_CLEARERR(zs_soft[channel].zs_channel); ZS_CLEARFIFO(zs_soft[channel].zs_channel); } else if(channel == MOUSE_LINE) { zs_soft[channel].cons_mouse = 1; zs_soft[channel].parity_mask = 0xff; zs_mousechan = zs_soft[channel].zs_channel; write_zsreg(zs_soft[channel].zs_channel, R4, (PAR_EVEN | X16CLK | SB1)); write_zsreg(zs_soft[channel].zs_channel, R3, Rx8); write_zsreg(zs_soft[channel].zs_channel, R5, Tx8); write_zsreg(zs_soft[channel].zs_channel, R9, NV); write_zsreg(zs_soft[channel].zs_channel, R10, NRZ); write_zsreg(zs_soft[channel].zs_channel, R11, (TCBR | RCBR)); zs_soft[channel].zs_baud = 4800; brg = BPS_TO_BRG(zs_soft[channel].zs_baud, ZS_CLOCK/zs_soft[channel].clk_divisor); write_zsreg(zs_soft[channel].zs_channel, R12, (brg & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R13, ((brg >> 8) & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC); /* Enable Rx, IRQs, and inform mouse driver */ write_zsreg(zs_soft[channel].zs_channel, R14, (BRSRC | BRENAB)); write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8 | RxENAB)); write_zsreg(zs_soft[channel].zs_channel, R5, Tx8); write_zsreg(zs_soft[channel].zs_channel, R15, (DCDIE | CTSIE | TxUIE | BRKIE)); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); write_zsreg(zs_soft[channel].zs_channel, R1, (EXT_INT_ENAB | INT_ALL_Rx)); write_zsreg(zs_soft[channel].zs_channel, R9, (NV | MIE)); sun_mouse_zsinit(); } else if (zs_soft[channel].is_cons) { brg = BPS_TO_BRG(zs_soft[channel].zs_baud, ZS_CLOCK/zs_soft[channel].clk_divisor); zscons_regs[12] = brg & 0xff; zscons_regs[13] = (brg >> 8) & 0xff; memcpy(zs_soft[channel].curregs, zscons_regs, sizeof(zscons_regs)); load_zsregs(&zs_soft[channel], zscons_regs); ZS_CLEARERR(zs_soft[channel].zs_channel); ZS_CLEARFIFO(zs_soft[channel].zs_channel); } else if (zs_soft[channel].kgdb_channel) { /* If this is the kgdb line, enable interrupts because * we now want to receive the 'control-c' character * from the client attached to us asynchronously. */ zs_soft[channel].parity_mask = 0xff; kgdb_chaninit(&zs_soft[channel], 1, zs_soft[channel].zs_baud); } else { zs_soft[channel].parity_mask = 0xff; write_zsreg(zs_soft[channel].zs_channel, R4, (PAR_EVEN | X16CLK | SB1)); write_zsreg(zs_soft[channel].zs_channel, R3, Rx8); write_zsreg(zs_soft[channel].zs_channel, R5, Tx8); write_zsreg(zs_soft[channel].zs_channel, R9, NV); write_zsreg(zs_soft[channel].zs_channel, R10, NRZ); write_zsreg(zs_soft[channel].zs_channel, R11, (RCBR | TCBR)); zs_soft[channel].zs_baud = 9600; brg = BPS_TO_BRG(zs_soft[channel].zs_baud, ZS_CLOCK/zs_soft[channel].clk_divisor); write_zsreg(zs_soft[channel].zs_channel, R12, (brg & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R13, ((brg >> 8) & 0xff)); write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC); write_zsreg(zs_soft[channel].zs_channel, R14, (BRSRC | BRENAB)); write_zsreg(zs_soft[channel].zs_channel, R3, Rx8); write_zsreg(zs_soft[channel].zs_channel, R5, Tx8); write_zsreg(zs_soft[channel].zs_channel, R15, DCDIE); write_zsreg(zs_soft[channel].zs_channel, R9, NV | MIE); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); write_zsreg(zs_soft[channel].zs_channel, R0, RES_EXT_INT); } } for (info = zs_chain, i=0; info; info = info->zs_next, i++) { info->magic = SERIAL_MAGIC; info->port = (long) info->zs_channel; info->line = i; info->tty = 0; info->irq = zilog_irq; info->custom_divisor = 16; info->close_delay = 50; info->closing_wait = 3000; info->x_char = 0; info->event = 0; info->count = 0; info->blocked_open = 0; info->tqueue.routine = do_softint; info->tqueue.data = info; info->tqueue_hangup.routine = do_serial_hangup; info->tqueue_hangup.data = info; info->callout_termios = callout_driver.init_termios; info->normal_termios = serial_driver.init_termios; init_waitqueue_head(&info->open_wait); init_waitqueue_head(&info->close_wait); printk("tty%02d at 0x%04x (irq = %s)", info->line, info->port, __irq_itoa(info->irq)); printk(" is a Zilog8530\n"); } restore_flags(flags); keyboard_zsinit(kbd_put_char); return 0; } /* This is called at boot time to prime the kgdb serial debugging * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 * for /dev/ttyb which is determined in setup_arch() from the * boot command line flags. */ __initfunc(static void zs_kgdb_hook(int tty_num)) { int chip = 0; if(!zs_chips[chip]) { zs_chips[chip] = get_zs(chip); /* Two channels per chip */ zs_channels[(chip*2)] = &zs_chips[chip]->channelA; zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB; } zs_soft[tty_num].zs_channel = zs_channels[tty_num]; zs_kgdbchan = zs_soft[tty_num].zs_channel; zs_soft[tty_num].change_needed = 0; zs_soft[tty_num].clk_divisor = 16; zs_soft[tty_num].zs_baud = 9600; zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */ zs_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */ /* Turn on transmitter/receiver at 8-bits/char */ kgdb_chaninit(&zs_soft[tty_num], 0, 9600); ZS_CLEARERR(zs_kgdbchan); ZS_CLEARFIFO(zs_kgdbchan); } #ifdef CONFIG_SERIAL_CONSOLE /* This is for console output over ttya/ttyb */ static void zs_console_putchar(struct sun_serial *info, char ch) { int loops = ZS_PUT_CHAR_MAX_DELAY; unsigned long flags; if(!info->zs_channel) return; save_flags(flags); cli(); zs_put_char(info->zs_channel, ch); while (!(read_zsreg(info->zs_channel, R1) & ALL_SNT) && --loops) udelay(5); restore_flags(flags); } #ifdef SERIAL_CONSOLE_FAIR_OUTPUT /* * Fair output driver allows a process to speak. */ static void zs_fair_output(struct sun_serial *info) { int left; /* Output no more than that */ unsigned long flags; char c; if (info == 0) return; if (info->xmit_buf == 0) return; save_flags(flags); cli(); left = info->xmit_cnt; while (left != 0) { c = info->xmit_buf[info->xmit_tail]; info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); info->xmit_cnt--; restore_flags(flags); zs_console_putchar(info, c); cli(); left = MIN(info->xmit_cnt, left-1); } /* Last character is being transmitted now (hopefully). */ info->zs_channel->control = RES_Tx_P; ZSDELAY(); restore_flags(flags); return; } #endif /* * zs_console_write is registered for printk. */ static void zs_console_write(struct console *con, const char *s, unsigned count) { struct sun_serial *info; int i; info = zs_soft + con->index; for (i = 0; i < count; i++, s++) { if(*s == '\n') zs_console_putchar(info, '\r'); zs_console_putchar(info, *s); } #ifdef SERIAL_CONSOLE_FAIR_OUTPUT /* Comment this if you want to have a strict interrupt-driven output */ zs_fair_output(info); #endif } static int zs_console_wait_key(struct console *con) { sleep_on(&keypress_wait); return 0; } static kdev_t zs_console_device(struct console *con) { return MKDEV(TTY_MAJOR, 64 + con->index); } __initfunc(static int zs_console_setup(struct console *con, char *options)) { struct sun_serial *info; int i, brg, baud; info = zs_soft + con->index; info->is_cons = 1; printk("Console: ttyS%d (Zilog8530)\n", info->line); sunserial_console_termios(con); i = con->cflag & CBAUD; if (con->cflag & CBAUDEX) { i &= ~CBAUDEX; con->cflag &= ~CBAUDEX; } baud = baud_table[i]; info->zs_baud = baud; switch (con->cflag & CSIZE) { case CS5: zscons_regs[3] = Rx5 | RxENAB; zscons_regs[5] = Tx5 | TxENAB; info->parity_mask = 0x1f; break; case CS6: zscons_regs[3] = Rx6 | RxENAB; zscons_regs[5] = Tx6 | TxENAB; info->parity_mask = 0x3f; break; case CS7: zscons_regs[3] = Rx7 | RxENAB; zscons_regs[5] = Tx7 | TxENAB; info->parity_mask = 0x7f; break; default: case CS8: zscons_regs[3] = Rx8 | RxENAB; zscons_regs[5] = Tx8 | TxENAB; info->parity_mask = 0xff; break; } zscons_regs[5] |= DTR; if (con->cflag & PARENB) zscons_regs[4] |= PAR_ENAB; if (!(con->cflag & PARODD)) zscons_regs[4] |= PAR_EVEN; if (con->cflag & CSTOPB) zscons_regs[4] |= SB2; else zscons_regs[4] |= SB1; brg = BPS_TO_BRG(baud, ZS_CLOCK / info->clk_divisor); zscons_regs[12] = brg & 0xff; zscons_regs[13] = (brg >> 8) & 0xff; memcpy(info->curregs, zscons_regs, sizeof(zscons_regs)); load_zsregs(info, zscons_regs); ZS_CLEARERR(info->zs_channel); ZS_CLEARFIFO(info->zs_channel); return 0; } static struct console zs_console = { "ttyS", zs_console_write, NULL, zs_console_device, zs_console_wait_key, NULL, zs_console_setup, CON_PRINTBUFFER, -1, 0, NULL }; __initfunc(static int zs_console_init(void)) { extern int con_is_present(void); if (con_is_present()) return 0; zs_console.index = serial_console - 1; register_console(&zs_console); return 0; } #endif /* CONFIG_SERIAL_CONSOLE */ |