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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [amiserial.c] - Rev 1774
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/* * linux/drivers/char/amiserial.c * * Serial driver for the amiga builtin port. * * This code was created by taking serial.c version 4.30 from kernel * release 2.3.22, replacing all hardware related stuff with the * corresponding amiga hardware actions, and removing all irrelevant * code. As a consequence, it uses many of the constants and names * associated with the registers and bits of 16550 compatible UARTS - * but only to keep track of status, etc in the state variables. It * was done this was to make it easier to keep the code in line with * (non hardware specific) changes to serial.c. * * The port is registered with the tty driver as minor device 64, and * therefore other ports should should only use 65 upwards. * * Richard Lucock 28/12/99 * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, * 1998, 1999 Theodore Ts'o * */ /* * Serial driver configuration section. Here are the various options: * * SERIAL_PARANOIA_CHECK * Check the magic number for the async_structure where * ever possible. */ #include <linux/config.h> #include <linux/version.h> #undef SERIAL_PARANOIA_CHECK #define SERIAL_DO_RESTART /* Set of debugging defines */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT /* Sanity checks */ #define SERIAL_INLINE #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s) #else #define DBG_CNT(s) #endif /* * End of serial driver configuration section. */ #include <linux/module.h> #include <linux/types.h> #include <linux/serial.h> #include <linux/serialP.h> #include <linux/serial_reg.h> static char *serial_version = "4.30"; #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/console.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/ptrace.h> #include <linux/ioport.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/delay.h> #include <asm/setup.h> #include <asm/system.h> #include <asm/irq.h> #include <asm/bitops.h> #include <asm/amigahw.h> #include <asm/amigaints.h> #ifdef SERIAL_INLINE #define _INLINE_ inline #endif static char *serial_name = "Amiga-builtin serial driver"; static DECLARE_TASK_QUEUE(tq_serial); static struct tty_driver serial_driver, callout_driver; static int serial_refcount; /* serial subtype definitions */ #ifndef SERIAL_TYPE_NORMAL #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 #endif /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 static struct async_struct *IRQ_ports; static unsigned char current_ctl_bits; static void change_speed(struct async_struct *info, struct termios *old); static void rs_wait_until_sent(struct tty_struct *tty, int timeout); static struct serial_state rs_table[1]; #define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state)) static struct tty_struct *serial_table[NR_PORTS]; static struct termios *serial_termios[NR_PORTS]; static struct termios *serial_termios_locked[NR_PORTS]; #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 copy_from_user 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; static DECLARE_MUTEX(tmp_buf_sem); #include <asm/uaccess.h> #define serial_isroot() (capable(CAP_SYS_ADMIN)) static inline int serial_paranoia_check(struct async_struct *info, kdev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for serial struct (%s) in %s\n"; static const char *badinfo = "Warning: null async_struct for (%s) in %s\n"; if (!info) { printk(badinfo, kdevname(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, kdevname(device), routine); return 1; } #endif return 0; } /* some serial hardware definitions */ #define SDR_OVRUN (1<<15) #define SDR_RBF (1<<14) #define SDR_TBE (1<<13) #define SDR_TSRE (1<<12) #define SERPER_PARENB (1<<15) #define AC_SETCLR (1<<15) #define AC_UARTBRK (1<<11) #define SER_DTR (1<<7) #define SER_RTS (1<<6) #define SER_DCD (1<<5) #define SER_CTS (1<<4) #define SER_DSR (1<<3) static __inline__ void rtsdtr_ctrl(int bits) { ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); } /* * ------------------------------------------------------------ * rs_stop() and rs_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. * ------------------------------------------------------------ */ static void rs_stop(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_stop")) return; save_flags(flags); cli(); if (info->IER & UART_IER_THRI) { info->IER &= ~UART_IER_THRI; /* disable Tx interrupt and remove any pending interrupts */ custom.intena = IF_TBE; mb(); custom.intreq = IF_TBE; mb(); } restore_flags(flags); } static void rs_start(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_start")) return; save_flags(flags); cli(); if (info->xmit.head != info->xmit.tail && info->xmit.buf && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); } restore_flags(flags); } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * rs_interrupt(). They were separated out for readability's sake. * * Note: rs_interrupt() is a "fast" interrupt, which means that it * runs with interrupts turned off. People who may want to modify * rs_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 rs_sched_event(struct async_struct *info, int event) { info->event |= 1 << event; queue_task(&info->tqueue, &tq_serial); mark_bh(SERIAL_BH); } static _INLINE_ void receive_chars(struct async_struct *info) { int status; int serdatr; struct tty_struct *tty = info->tty; unsigned char ch; struct async_icount *icount; icount = &info->state->icount; status = UART_LSR_DR; /* We obviously have a character! */ serdatr = custom.serdatr; mb(); custom.intreq = IF_RBF; mb(); if((serdatr & 0x1ff) == 0) status |= UART_LSR_BI; if(serdatr & SDR_OVRUN) status |= UART_LSR_OE; ch = serdatr & 0xff; if (tty->flip.count >= TTY_FLIPBUF_SIZE) goto ignore_char; *tty->flip.char_buf_ptr = ch; icount->rx++; #ifdef SERIAL_DEBUG_INTR printk("DR%02x:%02x...", ch, status); #endif *tty->flip.flag_buf_ptr = 0; /* * We don't handle parity or frame errors - but I have left * the code in, since I'm not sure that the errors can't be * detected. */ if (status & (UART_LSR_BI | UART_LSR_PE | UART_LSR_FE | UART_LSR_OE)) { /* * For statistics only */ if (status & UART_LSR_BI) { status &= ~(UART_LSR_FE | UART_LSR_PE); icount->brk++; } else if (status & UART_LSR_PE) icount->parity++; else if (status & UART_LSR_FE) icount->frame++; if (status & UART_LSR_OE) icount->overrun++; /* * Now check to see if character should be * ignored, and mask off conditions which * should be ignored. */ if (status & info->ignore_status_mask) goto ignore_char; status &= info->read_status_mask; if (status & (UART_LSR_BI)) { #ifdef SERIAL_DEBUG_INTR printk("handling break...."); #endif *tty->flip.flag_buf_ptr = TTY_BREAK; if (info->flags & ASYNC_SAK) do_SAK(tty); } else if (status & UART_LSR_PE) *tty->flip.flag_buf_ptr = TTY_PARITY; else if (status & UART_LSR_FE) *tty->flip.flag_buf_ptr = TTY_FRAME; if (status & UART_LSR_OE) { /* * Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ if (tty->flip.count < TTY_FLIPBUF_SIZE) { tty->flip.count++; tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; *tty->flip.flag_buf_ptr = TTY_OVERRUN; } } } tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; tty->flip.count++; ignore_char: tty_flip_buffer_push(tty); } static _INLINE_ void transmit_chars(struct async_struct *info) { custom.intreq = IF_TBE; mb(); if (info->x_char) { custom.serdat = info->x_char | 0x100; mb(); info->state->icount.tx++; info->x_char = 0; return; } if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) { info->IER &= ~UART_IER_THRI; custom.intena = IF_TBE; mb(); return; } custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; mb(); info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); info->state->icount.tx++; if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) < WAKEUP_CHARS) rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); #ifdef SERIAL_DEBUG_INTR printk("THRE..."); #endif if (info->xmit.head == info->xmit.tail) { custom.intena = IF_TBE; mb(); info->IER &= ~UART_IER_THRI; } } static _INLINE_ void check_modem_status(struct async_struct *info) { unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); unsigned char dstatus; struct async_icount *icount; /* Determine bits that have changed */ dstatus = status ^ current_ctl_bits; current_ctl_bits = status; if (dstatus) { icount = &info->state->icount; /* update input line counters */ if (dstatus & SER_DSR) icount->dsr++; if (dstatus & SER_DCD) { icount->dcd++; #ifdef CONFIG_HARD_PPS if ((info->flags & ASYNC_HARDPPS_CD) && !(status & SER_DCD)) hardpps(); #endif } if (dstatus & SER_CTS) icount->cts++; wake_up_interruptible(&info->delta_msr_wait); } if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) printk("ttyS%02d CD now %s...", info->line, (!(status & SER_DCD)) ? "on" : "off"); #endif if (!(status & SER_DCD)) wake_up_interruptible(&info->open_wait); else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_CALLOUT_NOHUP))) { #ifdef SERIAL_DEBUG_OPEN printk("doing serial hangup..."); #endif if (info->tty) tty_hangup(info->tty); } } if (info->flags & ASYNC_CTS_FLOW) { if (info->tty->hw_stopped) { if (!(status & SER_CTS)) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx start..."); #endif info->tty->hw_stopped = 0; info->IER |= UART_IER_THRI; custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); return; } } else { if ((status & SER_CTS)) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx stop..."); #endif info->tty->hw_stopped = 1; info->IER &= ~UART_IER_THRI; /* disable Tx interrupt and remove any pending interrupts */ custom.intena = IF_TBE; mb(); custom.intreq = IF_TBE; mb(); } } } } static void ser_vbl_int( int irq, void *data, struct pt_regs *regs) { /* vbl is just a periodic interrupt we tie into to update modem status */ struct async_struct * info = IRQ_ports; /* * TBD - is it better to unregister from this interrupt or to * ignore it if MSI is clear ? */ if(info->IER & UART_IER_MSI) check_modem_status(info); } static void ser_rx_int(int irq, void *dev_id, struct pt_regs * regs) { struct async_struct * info; #ifdef SERIAL_DEBUG_INTR printk("ser_rx_int..."); #endif info = IRQ_ports; if (!info || !info->tty) return; receive_chars(info); info->last_active = jiffies; #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } static void ser_tx_int(int irq, void *dev_id, struct pt_regs * regs) { struct async_struct * info; if (custom.serdatr & SDR_TBE) { #ifdef SERIAL_DEBUG_INTR printk("ser_tx_int..."); #endif info = IRQ_ports; if (!info || !info->tty) return; transmit_chars(info); info->last_active = jiffies; #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } } /* * ------------------------------------------------------------------- * 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 * rs_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 rs_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 async_struct *info = (struct async_struct *) 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); } } /* * --------------------------------------------------------------- * Low level utility subroutines for the serial driver: routines to * figure out the appropriate timeout for an interrupt chain, routines * to initialize and startup a serial port, and routines to shutdown a * serial port. Useful stuff like that. * --------------------------------------------------------------- */ static int startup(struct async_struct * info) { unsigned long flags; int retval=0; unsigned long page; page = get_free_page(GFP_KERNEL); if (!page) return -ENOMEM; save_flags(flags); cli(); if (info->flags & ASYNC_INITIALIZED) { free_page(page); goto errout; } if (info->xmit.buf) free_page(page); else info->xmit.buf = (unsigned char *) page; #ifdef SERIAL_DEBUG_OPEN printk("starting up ttys%d ...", info->line); #endif /* Clear anything in the input buffer */ custom.intreq = IF_RBF; mb(); retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); if (retval) { if (serial_isroot()) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); retval = 0; } goto errout; } /* enable both Rx and Tx interrupts */ custom.intena = IF_SETCLR | IF_RBF | IF_TBE; mb(); info->IER = UART_IER_MSI; /* remember current state of the DCD and CTS bits */ current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); IRQ_ports = info; info->MCR = 0; if (info->tty->termios->c_cflag & CBAUD) info->MCR = SER_DTR | SER_RTS; rtsdtr_ctrl(info->MCR); if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit.head = info->xmit.tail = 0; /* * Set up the tty->alt_speed kludge */ if (info->tty) { if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) info->tty->alt_speed = 57600; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) info->tty->alt_speed = 115200; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) info->tty->alt_speed = 230400; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) info->tty->alt_speed = 460800; } /* * and set the speed of the serial port */ change_speed(info, 0); info->flags |= ASYNC_INITIALIZED; restore_flags(flags); return 0; errout: restore_flags(flags); return retval; } /* * 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 async_struct * info) { unsigned long flags; struct serial_state *state; if (!(info->flags & ASYNC_INITIALIZED)) return; state = info->state; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d ....\n", info->line); #endif save_flags(flags); cli(); /* Disable interrupts */ /* * clear delta_msr_wait queue to avoid mem leaks: we may free the irq * here so the queue might never be waken up */ wake_up_interruptible(&info->delta_msr_wait); IRQ_ports = NULL; /* * Free the IRQ, if necessary */ free_irq(IRQ_AMIGA_VERTB, info); if (info->xmit.buf) { free_page((unsigned long) info->xmit.buf); info->xmit.buf = 0; } info->IER = 0; custom.intena = IF_RBF | IF_TBE; mb(); /* disable break condition */ custom.adkcon = AC_UARTBRK; mb(); if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) info->MCR &= ~(SER_DTR|SER_RTS); rtsdtr_ctrl(info->MCR); if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); info->flags &= ~ASYNC_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 async_struct *info, struct termios *old_termios) { int quot = 0, baud_base, baud; unsigned cflag, cval = 0; int bits; unsigned long flags; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; /* Byte size is always 8 bits plus parity bit if requested */ cval = 3; bits = 10; if (cflag & CSTOPB) { cval |= 0x04; bits++; } if (cflag & PARENB) { cval |= UART_LCR_PARITY; bits++; } if (!(cflag & PARODD)) cval |= UART_LCR_EPAR; #ifdef CMSPAR if (cflag & CMSPAR) cval |= UART_LCR_SPAR; #endif /* Determine divisor based on baud rate */ baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; /* B0 transition handled in rs_set_termios */ baud_base = info->state->baud_base; if (baud == 38400 && ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) quot = info->state->custom_divisor; else { if (baud == 134) /* Special case since 134 is really 134.5 */ quot = (2*baud_base / 269); else if (baud) quot = baud_base / baud; } /* If the quotient is zero refuse the change */ if (!quot && old_termios) { info->tty->termios->c_cflag &= ~CBAUD; info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; if (baud == 38400 && ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) quot = info->state->custom_divisor; else { if (baud == 134) /* Special case since 134 is really 134.5 */ quot = (2*baud_base / 269); else if (baud) quot = baud_base / baud; } } /* As a last resort, if the quotient is zero, default to 9600 bps */ if (!quot) quot = baud_base / 9600; info->quot = quot; info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); info->timeout += HZ/50; /* Add .02 seconds of slop */ /* CTS flow control flag and modem status interrupts */ info->IER &= ~UART_IER_MSI; if (info->flags & ASYNC_HARDPPS_CD) info->IER |= UART_IER_MSI; if (cflag & CRTSCTS) { info->flags |= ASYNC_CTS_FLOW; info->IER |= UART_IER_MSI; } else info->flags &= ~ASYNC_CTS_FLOW; if (cflag & CLOCAL) info->flags &= ~ASYNC_CHECK_CD; else { info->flags |= ASYNC_CHECK_CD; info->IER |= UART_IER_MSI; } /* TBD: * Does clearing IER_MSI imply that we should disbale the VBL interrupt ? */ /* * Set up parity check flag */ #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) info->read_status_mask = UART_LSR_OE | UART_LSR_DR; if (I_INPCK(info->tty)) info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) info->read_status_mask |= UART_LSR_BI; /* * Characters to ignore */ info->ignore_status_mask = 0; if (I_IGNPAR(info->tty)) info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; if (I_IGNBRK(info->tty)) { info->ignore_status_mask |= UART_LSR_BI; /* * If we're ignore parity and break indicators, ignore * overruns too. (For real raw support). */ if (I_IGNPAR(info->tty)) info->ignore_status_mask |= UART_LSR_OE; } /* * !!! ignore all characters if CREAD is not set */ if ((cflag & CREAD) == 0) info->ignore_status_mask |= UART_LSR_DR; save_flags(flags); cli(); { short serper; /* Set up the baud rate */ serper = quot - 1; /* Enable or disable parity bit */ if(cval & UART_LCR_PARITY) serper |= (SERPER_PARENB); custom.serper = serper; mb(); } info->LCR = cval; /* Save LCR */ restore_flags(flags); } static void rs_put_char(struct tty_struct *tty, unsigned char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_put_char")) return; if (!tty || !info->xmit.buf) return; save_flags(flags); cli(); if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) { restore_flags(flags); return; } info->xmit.buf[info->xmit.head++] = ch; info->xmit.head &= SERIAL_XMIT_SIZE-1; restore_flags(flags); } static void rs_flush_chars(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_chars")) return; if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped || !info->xmit.buf) return; save_flags(flags); cli(); info->IER |= UART_IER_THRI; custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); restore_flags(flags); } static int rs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, ret = 0; struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_write")) return 0; if (!tty || !info->xmit.buf || !tmp_buf) return 0; save_flags(flags); if (from_user) { down(&tmp_buf_sem); while (1) { int c1; c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (count < c) c = count; c -= copy_from_user(tmp_buf, buf, c); if (!c) { if (!ret) ret = -EFAULT; break; } cli(); c1 = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (c1 < c) c = c1; memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c); info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1)); restore_flags(flags); buf += c; count -= c; ret += c; } up(&tmp_buf_sem); } else { cli(); while (1) { c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); if (count < c) c = count; if (c <= 0) { break; } memcpy(info->xmit.buf + info->xmit.head, buf, c); info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1)); buf += c; count -= c; ret += c; } restore_flags(flags); } if (info->xmit.head != info->xmit.tail && !tty->stopped && !tty->hw_stopped && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; cli(); custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); restore_flags(flags); } return ret; } static int rs_write_room(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_write_room")) return 0; return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); } static int rs_chars_in_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer")) return 0; return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); } static void rs_flush_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_buffer")) return; save_flags(flags); cli(); info->xmit.head = info->xmit.tail = 0; restore_flags(flags); wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * This function is used to send a high-priority XON/XOFF character to * the device */ static void rs_send_xchar(struct tty_struct *tty, char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_send_char")) return; info->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ /* Check this ! */ save_flags(flags); cli(); if(!(custom.intenar & IF_TBE)) { custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); } restore_flags(flags); info->IER |= UART_IER_THRI; } } /* * ------------------------------------------------------------ * rs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void rs_throttle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #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, "rs_throttle")) return; if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); if (tty->termios->c_cflag & CRTSCTS) info->MCR &= ~SER_RTS; save_flags(flags); cli(); rtsdtr_ctrl(info->MCR); restore_flags(flags); } static void rs_unthrottle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #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, "rs_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else rs_send_xchar(tty, START_CHAR(tty)); } if (tty->termios->c_cflag & CRTSCTS) info->MCR |= SER_RTS; save_flags(flags); cli(); rtsdtr_ctrl(info->MCR); restore_flags(flags); } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct async_struct * info, struct serial_struct * retinfo) { struct serial_struct tmp; struct serial_state *state = info->state; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tmp.type = state->type; tmp.line = state->line; tmp.port = state->port; tmp.irq = state->irq; tmp.flags = state->flags; tmp.xmit_fifo_size = state->xmit_fifo_size; tmp.baud_base = state->baud_base; tmp.close_delay = state->close_delay; tmp.closing_wait = state->closing_wait; tmp.custom_divisor = state->custom_divisor; if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) return -EFAULT; return 0; } static int set_serial_info(struct async_struct * info, struct serial_struct * new_info) { struct serial_struct new_serial; struct serial_state old_state, *state; unsigned int change_irq,change_port; int retval = 0; if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; state = info->state; old_state = *state; change_irq = new_serial.irq != state->irq; change_port = (new_serial.port != state->port); if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) return -EINVAL; if (!serial_isroot()) { if ((new_serial.baud_base != state->baud_base) || (new_serial.close_delay != state->close_delay) || (new_serial.xmit_fifo_size != state->xmit_fifo_size) || ((new_serial.flags & ~ASYNC_USR_MASK) != (state->flags & ~ASYNC_USR_MASK))) return -EPERM; state->flags = ((state->flags & ~ASYNC_USR_MASK) | (new_serial.flags & ASYNC_USR_MASK)); info->flags = ((info->flags & ~ASYNC_USR_MASK) | (new_serial.flags & ASYNC_USR_MASK)); state->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } if (new_serial.baud_base < 9600) return -EINVAL; /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ state->baud_base = new_serial.baud_base; state->flags = ((state->flags & ~ASYNC_FLAGS) | (new_serial.flags & ASYNC_FLAGS)); info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) | (info->flags & ASYNC_INTERNAL_FLAGS)); state->custom_divisor = new_serial.custom_divisor; state->close_delay = new_serial.close_delay * HZ/100; state->closing_wait = new_serial.closing_wait * HZ/100; info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; check_and_exit: if (info->flags & ASYNC_INITIALIZED) { if (((old_state.flags & ASYNC_SPD_MASK) != (state->flags & ASYNC_SPD_MASK)) || (old_state.custom_divisor != state->custom_divisor)) { if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) info->tty->alt_speed = 57600; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) info->tty->alt_speed = 115200; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) info->tty->alt_speed = 230400; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) info->tty->alt_speed = 460800; change_speed(info, 0); } } else 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 async_struct * info, unsigned int *value) { unsigned char status; unsigned int result; unsigned long flags; save_flags(flags); cli(); status = custom.serdatr; mb(); restore_flags(flags); result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); if (copy_to_user(value, &result, sizeof(int))) return -EFAULT; return 0; } static int get_modem_info(struct async_struct * info, unsigned int *value) { unsigned char control, status; unsigned int result; unsigned long flags; control = info->MCR; save_flags(flags); cli(); status = ciab.pra; restore_flags(flags); result = ((control & SER_RTS) ? TIOCM_RTS : 0) | ((control & SER_DTR) ? TIOCM_DTR : 0) | (!(status & SER_DCD) ? TIOCM_CAR : 0) | (!(status & SER_DSR) ? TIOCM_DSR : 0) | (!(status & SER_CTS) ? TIOCM_CTS : 0); if (copy_to_user(value, &result, sizeof(int))) return -EFAULT; return 0; } static int set_modem_info(struct async_struct * info, unsigned int cmd, unsigned int *value) { unsigned int arg; unsigned long flags; if (copy_from_user(&arg, value, sizeof(int))) return -EFAULT; switch (cmd) { case TIOCMBIS: if (arg & TIOCM_RTS) info->MCR |= SER_RTS; if (arg & TIOCM_DTR) info->MCR |= SER_DTR; break; case TIOCMBIC: if (arg & TIOCM_RTS) info->MCR &= ~SER_RTS; if (arg & TIOCM_DTR) info->MCR &= ~SER_DTR; break; case TIOCMSET: info->MCR = ((info->MCR & ~(SER_RTS | SER_DTR)) | ((arg & TIOCM_RTS) ? SER_RTS : 0) | ((arg & TIOCM_DTR) ? SER_DTR : 0)); break; default: return -EINVAL; } save_flags(flags); cli(); rtsdtr_ctrl(info->MCR); restore_flags(flags); return 0; } /* * rs_break() --- routine which turns the break handling on or off */ static void rs_break(struct tty_struct *tty, int break_state) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_break")) return; save_flags(flags); cli(); if (break_state == -1) custom.adkcon = AC_SETCLR | AC_UARTBRK; else custom.adkcon = AC_UARTBRK; mb(); restore_flags(flags); } static int rs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct async_icount cprev, cnow; /* kernel counter temps */ struct serial_icounter_struct icount; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } switch (cmd) { 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 TIOCSERCONFIG: return 0; case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, (unsigned int *) arg); case TIOCSERGSTRUCT: if (copy_to_user((struct async_struct *) arg, info, sizeof(struct async_struct))) return -EFAULT; return 0; /* * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change * - mask passed in arg for lines of interest * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) * Caller should use TIOCGICOUNT to see which one it was */ case TIOCMIWAIT: save_flags(flags); cli(); /* note the counters on entry */ cprev = info->state->icount; restore_flags(flags); while (1) { interruptible_sleep_on(&info->delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; save_flags(flags); cli(); cnow = info->state->icount; /* atomic copy */ restore_flags(flags); if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) return -EIO; /* no change => error */ if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { return 0; } cprev = cnow; } /* NOTREACHED */ /* * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) * Return: write counters to the user passed counter struct * NB: both 1->0 and 0->1 transitions are counted except for * RI where only 0->1 is counted. */ case TIOCGICOUNT: save_flags(flags); cli(); cnow = info->state->icount; restore_flags(flags); icount.cts = cnow.cts; icount.dsr = cnow.dsr; icount.rng = cnow.rng; icount.dcd = cnow.dcd; icount.rx = cnow.rx; icount.tx = cnow.tx; icount.frame = cnow.frame; icount.overrun = cnow.overrun; icount.parity = cnow.parity; icount.brk = cnow.brk; icount.buf_overrun = cnow.buf_overrun; if (copy_to_user((void *)arg, &icount, sizeof(icount))) return -EFAULT; return 0; case TIOCSERGWILD: case TIOCSERSWILD: /* "setserial -W" is called in Debian boot */ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); return 0; default: return -ENOIOCTLCMD; } return 0; } static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; unsigned int cflag = tty->termios->c_cflag; if ( (cflag == old_termios->c_cflag) && ( RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) return; change_speed(info, old_termios); /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { info->MCR &= ~(SER_DTR|SER_RTS); save_flags(flags); cli(); rtsdtr_ctrl(info->MCR); restore_flags(flags); } /* Handle transition away from B0 status */ if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { info->MCR |= SER_DTR; if (!(tty->termios->c_cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) { info->MCR |= SER_RTS; } save_flags(flags); cli(); rtsdtr_ctrl(info->MCR); restore_flags(flags); } /* Handle turning off CRTSCTS */ if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; rs_start(tty); } #if 0 /* * No need to wake up processes in open wait, since they * sample the CLOCAL flag once, and don't recheck it. * XXX It's not clear whether the current behavior is correct * or not. Hence, this may change..... */ if (!(old_termios->c_cflag & CLOCAL) && (tty->termios->c_cflag & CLOCAL)) wake_up_interruptible(&info->open_wait); #endif } /* * ------------------------------------------------------------ * rs_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 * async structure from the interrupt chain if necessary, and we free * that IRQ if nothing is left in the chain. * ------------------------------------------------------------ */ static void rs_close(struct tty_struct *tty, struct file * filp) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "rs_close")) return; state = info->state; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { DBG_CNT("before DEC-hung"); MOD_DEC_USE_COUNT; restore_flags(flags); return; } #ifdef SERIAL_DEBUG_OPEN printk("rs_close ttys%d, count = %d\n", info->line, state->count); #endif if ((tty->count == 1) && (state->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. state->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("rs_close: bad serial port count; tty->count is 1, " "state->count is %d\n", state->count); state->count = 1; } if (--state->count < 0) { printk("rs_close: bad serial port count for ttys%d: %d\n", info->line, state->count); state->count = 0; } if (state->count) { DBG_CNT("before DEC-2"); MOD_DEC_USE_COUNT; restore_flags(flags); return; } info->flags |= ASYNC_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ASYNC_NORMAL_ACTIVE) info->state->normal_termios = *tty->termios; if (info->flags & ASYNC_CALLOUT_ACTIVE) info->state->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 != ASYNC_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. */ info->read_status_mask &= ~UART_LSR_DR; if (info->flags & ASYNC_INITIALIZED) { /* disable receive interrupts */ custom.intena = IF_RBF; mb(); /* clear any pending receive interrupt */ custom.intreq = IF_RBF; mb(); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ rs_wait_until_sent(tty, info->timeout); } 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 (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); MOD_DEC_USE_COUNT; restore_flags(flags); } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long orig_jiffies, char_time; int lsr; if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent")) return; if (info->xmit_fifo_size == 0) return; /* Just in case.... */ orig_jiffies = jiffies; /* * Set the check interval to be 1/5 of the estimated time to * send a single character, and make it at least 1. The check * interval should also be less than the timeout. * * Note: we have to use pretty tight timings here to satisfy * the NIST-PCTS. */ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; char_time = char_time / 5; if (char_time == 0) char_time = 1; if (timeout) char_time = MIN(char_time, timeout); /* * If the transmitter hasn't cleared in twice the approximate * amount of time to send the entire FIFO, it probably won't * ever clear. This assumes the UART isn't doing flow * control, which is currently the case. Hence, if it ever * takes longer than info->timeout, this is probably due to a * UART bug of some kind. So, we clamp the timeout parameter at * 2*info->timeout. */ if (!timeout || timeout > 2*info->timeout) timeout = 2*info->timeout; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); printk("jiff=%lu...", jiffies); #endif while(!((lsr = custom.serdatr) & SDR_TSRE)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); #endif current->state = TASK_INTERRUPTIBLE; schedule_timeout(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } current->state = TASK_RUNNING; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); #endif } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ static void rs_hangup(struct tty_struct *tty) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state = info->state; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; state = info->state; rs_flush_buffer(tty); shutdown(info); info->event = 0; state->count = 0; info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct async_struct *info) { #ifdef DECLARE_WAITQUEUE DECLARE_WAITQUEUE(wait, current); #else struct wait_queue wait = { current, NULL }; #endif struct serial_state *state = info->state; int retval; int do_clocal = 0, extra_count = 0; unsigned long flags; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -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 & ASYNC_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ASYNC_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 & ASYNC_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } if (info->flags & ASYNC_CALLOUT_ACTIVE) { if (state->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, state->count is dropped by one, so that * rs_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", state->line, state->count); #endif save_flags(flags); cli(); if (!tty_hung_up_p(filp)) { extra_count = 1; state->count--; } restore_flags(flags); info->blocked_open++; while (1) { save_flags(flags); cli(); if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && (tty->termios->c_cflag & CBAUD)) rtsdtr_ctrl(SER_DTR|SER_RTS); restore_flags(flags); set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) { #ifdef SERIAL_DO_RESTART if (info->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && !(info->flags & ASYNC_CLOSING) && (do_clocal || (!(ciab.pra & SER_DCD)) )) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready blocking: ttys%d, count = %d\n", info->line, state->count); #endif schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (extra_count) state->count++; info->blocked_open--; #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready after blocking: ttys%d, count = %d\n", info->line, state->count); #endif if (retval) return retval; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } static int get_async_struct(int line, struct async_struct **ret_info) { struct async_struct *info; struct serial_state *sstate; sstate = rs_table + line; sstate->count++; if (sstate->info) { *ret_info = sstate->info; return 0; } info = kmalloc(sizeof(struct async_struct), GFP_KERNEL); if (!info) { sstate->count--; return -ENOMEM; } memset(info, 0, sizeof(struct async_struct)); #ifdef DECLARE_WAITQUEUE init_waitqueue_head(&info->open_wait); init_waitqueue_head(&info->close_wait); init_waitqueue_head(&info->delta_msr_wait); #endif info->magic = SERIAL_MAGIC; info->port = sstate->port; info->flags = sstate->flags; info->xmit_fifo_size = sstate->xmit_fifo_size; info->line = line; info->tqueue.routine = do_softint; info->tqueue.data = info; info->state = sstate; if (sstate->info) { kfree(info); *ret_info = sstate->info; return 0; } *ret_info = sstate->info = info; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its async structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int rs_open(struct tty_struct *tty, struct file * filp) { struct async_struct *info; int retval, line; unsigned long page; MOD_INC_USE_COUNT; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= NR_PORTS)) { MOD_DEC_USE_COUNT; return -ENODEV; } retval = get_async_struct(line, &info); if (retval) { MOD_DEC_USE_COUNT; return retval; } tty->driver_data = info; info->tty = tty; if (serial_paranoia_check(info, tty->device, "rs_open")) return -ENODEV; #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line, info->state->count); #endif info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; if (!tmp_buf) { page = get_free_page(GFP_KERNEL); if (!page) { return -ENOMEM; } if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * 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("rs_open returning after block_til_ready with %d\n", retval); #endif return retval; } if ((info->state->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->state->normal_termios; else *tty->termios = info->state->callout_termios; change_speed(info, 0); } info->session = current->session; info->pgrp = current->pgrp; #ifdef SERIAL_DEBUG_OPEN printk("rs_open ttys%d successful...", info->line); #endif return 0; } /* * /proc fs routines.... */ static inline int line_info(char *buf, struct serial_state *state) { struct async_struct *info = state->info, scr_info; char stat_buf[30], control, status; int ret; unsigned long flags; ret = sprintf(buf, "%d: uart:amiga_builtin",state->line); /* * Figure out the current RS-232 lines */ if (!info) { info = &scr_info; /* This is just for serial_{in,out} */ info->magic = SERIAL_MAGIC; info->flags = state->flags; info->quot = 0; info->tty = 0; } save_flags(flags); cli(); status = ciab.pra; control = info ? info->MCR : status; restore_flags(flags); stat_buf[0] = 0; stat_buf[1] = 0; if(!(control & SER_RTS)) strcat(stat_buf, "|RTS"); if(!(status & SER_CTS)) strcat(stat_buf, "|CTS"); if(!(control & SER_DTR)) strcat(stat_buf, "|DTR"); if(!(status & SER_DSR)) strcat(stat_buf, "|DSR"); if(!(status & SER_DCD)) strcat(stat_buf, "|CD"); if (info->quot) { ret += sprintf(buf+ret, " baud:%d", state->baud_base / info->quot); } ret += sprintf(buf+ret, " tx:%d rx:%d", state->icount.tx, state->icount.rx); if (state->icount.frame) ret += sprintf(buf+ret, " fe:%d", state->icount.frame); if (state->icount.parity) ret += sprintf(buf+ret, " pe:%d", state->icount.parity); if (state->icount.brk) ret += sprintf(buf+ret, " brk:%d", state->icount.brk); if (state->icount.overrun) ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); /* * Last thing is the RS-232 status lines */ ret += sprintf(buf+ret, " %s\n", stat_buf+1); return ret; } static int rs_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { int len = 0, l; off_t begin = 0; len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); l = line_info(page + len, &rs_table[0]); len += l; if (len+begin > off+count) goto done; if (len+begin < off) { begin += len; len = 0; } *eof = 1; done: if (off >= len+begin) return 0; *start = page + (off-begin); return ((count < begin+len-off) ? count : begin+len-off); } /* * --------------------------------------------------------------------- * rs_init() and friends * * rs_init() is called at boot-time to initialize the serial driver. * --------------------------------------------------------------------- */ /* * This routine prints out the appropriate serial driver version * number, and identifies which options were configured into this * driver. */ static _INLINE_ void show_serial_version(void) { printk(KERN_INFO "%s version %s\n", serial_name, serial_version); } int register_serial(struct serial_struct *req); void unregister_serial(int line); /* * The serial driver boot-time initialization code! */ static int __init rs_init(void) { unsigned long flags; struct serial_state * state; if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL)) return -ENODEV; /* * We request SERDAT and SERPER only, because the serial registers are * too spreaded over the custom register space */ if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]")) return -EBUSY; init_bh(SERIAL_BH, do_serial_bh); IRQ_ports = NULL; show_serial_version(); /* Initialize the tty_driver structure */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.driver_name = "amiserial"; serial_driver.name = "ttyS"; serial_driver.major = TTY_MAJOR; serial_driver.minor_start = 64; serial_driver.num = 1; 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 = rs_open; serial_driver.close = rs_close; serial_driver.write = rs_write; serial_driver.put_char = rs_put_char; serial_driver.flush_chars = rs_flush_chars; serial_driver.write_room = rs_write_room; serial_driver.chars_in_buffer = rs_chars_in_buffer; serial_driver.flush_buffer = rs_flush_buffer; serial_driver.ioctl = rs_ioctl; serial_driver.throttle = rs_throttle; serial_driver.unthrottle = rs_unthrottle; serial_driver.set_termios = rs_set_termios; serial_driver.stop = rs_stop; serial_driver.start = rs_start; serial_driver.hangup = rs_hangup; serial_driver.break_ctl = rs_break; serial_driver.send_xchar = rs_send_xchar; serial_driver.wait_until_sent = rs_wait_until_sent; serial_driver.read_proc = rs_read_proc; /* * 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; callout_driver.read_proc = 0; callout_driver.proc_entry = 0; 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"); state = rs_table; state->magic = SSTATE_MAGIC; state->port = (int)&custom.serdatr; /* Just to give it a value */ state->line = 0; state->custom_divisor = 0; state->close_delay = 5*HZ/10; state->closing_wait = 30*HZ; state->callout_termios = callout_driver.init_termios; state->normal_termios = serial_driver.init_termios; state->icount.cts = state->icount.dsr = state->icount.rng = state->icount.dcd = 0; state->icount.rx = state->icount.tx = 0; state->icount.frame = state->icount.parity = 0; state->icount.overrun = state->icount.brk = 0; /* if(state->port && check_region(state->port,REGION_LENGTH(state))) continue; */ printk(KERN_INFO "ttyS%02d is the amiga builtin serial port\n", state->line); /* Hardware set up */ state->baud_base = amiga_colorclock; state->xmit_fifo_size = 1; save_flags (flags); cli(); /* set ISRs, and then disable the rx interrupts */ request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state); /* turn off Rx and Tx interrupts */ custom.intena = IF_RBF | IF_TBE; mb(); /* clear any pending interrupt */ custom.intreq = IF_RBF | IF_TBE; mb(); restore_flags (flags); /* * set the appropriate directions for the modem control flags, * and clear RTS and DTR */ ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ return 0; } static __exit void rs_exit(void) { unsigned long flags; int e1, e2; struct async_struct *info; /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ save_flags(flags); cli(); remove_bh(SERIAL_BH); if ((e1 = tty_unregister_driver(&serial_driver))) printk("SERIAL: failed to unregister serial driver (%d)\n", e1); if ((e2 = tty_unregister_driver(&callout_driver))) printk("SERIAL: failed to unregister callout driver (%d)\n", e2); restore_flags(flags); info = rs_table[0].info; if (info) { rs_table[0].info = NULL; kfree(info); } if (tmp_buf) { free_page((unsigned long) tmp_buf); tmp_buf = NULL; } release_mem_region(CUSTOM_PHYSADDR+0x30, 4); } module_init(rs_init) module_exit(rs_exit) /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ #ifdef CONFIG_SERIAL_CONSOLE static void amiga_serial_putc(char c) { custom.serdat = (unsigned char)c | 0x100; while (!(custom.serdatr & 0x2000)) barrier(); } /* * Print a string to the serial port trying not to disturb * any possible real use of the port... * * The console must be locked when we get here. */ static void serial_console_write(struct console *co, const char *s, unsigned count) { unsigned short intena = custom.intenar; custom.intena = IF_TBE; while (count--) { if (*s == '\n') amiga_serial_putc('\r'); amiga_serial_putc(*s++); } custom.intena = IF_SETCLR | (intena & IF_TBE); } static kdev_t serial_console_device(struct console *c) { return MKDEV(TTY_MAJOR, 64); } static struct console sercons = { name: "ttyS", write: serial_console_write, device: serial_console_device, flags: CON_PRINTBUFFER, index: -1, }; /* * Register console. */ void __init serial_console_init(void) { register_console(&sercons); } #endif MODULE_LICENSE("GPL");
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