/* * 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 #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 */ #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) #else #define DBG_CNT(s) #endif /* * End of serial driver configuration section. */ #include #include #include #include static char *serial_version = "4.30"; #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct serial_state { struct tty_port tport; struct circ_buf xmit; struct async_icount icount; unsigned long port; int baud_base; int xmit_fifo_size; int custom_divisor; int read_status_mask; int ignore_status_mask; int timeout; int quot; int IER; /* Interrupt Enable Register */ int MCR; /* Modem control register */ int x_char; /* xon/xoff character */ }; #define custom amiga_custom static char *serial_name = "Amiga-builtin serial driver"; static struct tty_driver *serial_driver; /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 static unsigned char current_ctl_bits; static void change_speed(struct tty_struct *tty, struct serial_state *info, struct ktermios *old); static void rs_wait_until_sent(struct tty_struct *tty, int timeout); static struct serial_state rs_table[1]; #define NR_PORTS ARRAY_SIZE(rs_table) #include #define serial_isroot() (capable(CAP_SYS_ADMIN)) static inline int serial_paranoia_check(struct serial_state *info, char *name, 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, name, routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, name, 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 serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_stop")) return; local_irq_save(flags); 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(); } local_irq_restore(flags); } static void rs_start(struct tty_struct *tty) { struct serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_start")) return; local_irq_save(flags); 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(); } local_irq_restore(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 * ----------------------------------------------------------------------- */ static void receive_chars(struct serial_state *info) { int status; int serdatr; unsigned char ch, flag; struct async_icount *icount; int oe = 0; icount = &info->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; icount->rx++; #ifdef SERIAL_DEBUG_INTR printk("DR%02x:%02x...", ch, status); #endif flag = TTY_NORMAL; /* * 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 out; status &= info->read_status_mask; if (status & (UART_LSR_BI)) { #ifdef SERIAL_DEBUG_INTR printk("handling break...."); #endif flag = TTY_BREAK; if (info->tport.flags & ASYNC_SAK) do_SAK(info->tport.tty); } else if (status & UART_LSR_PE) flag = TTY_PARITY; else if (status & UART_LSR_FE) flag = TTY_FRAME; if (status & UART_LSR_OE) { /* * Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ oe = 1; } } tty_insert_flip_char(&info->tport, ch, flag); if (oe == 1) tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); tty_flip_buffer_push(&info->tport); out: return; } static void transmit_chars(struct serial_state *info) { custom.intreq = IF_TBE; mb(); if (info->x_char) { custom.serdat = info->x_char | 0x100; mb(); info->icount.tx++; info->x_char = 0; return; } if (info->xmit.head == info->xmit.tail || info->tport.tty->stopped || info->tport.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->icount.tx++; if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) < WAKEUP_CHARS) tty_wakeup(info->tport.tty); #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 void check_modem_status(struct serial_state *info) { struct tty_port *port = &info->tport; 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->icount; /* update input line counters */ if (dstatus & SER_DSR) icount->dsr++; if (dstatus & SER_DCD) { icount->dcd++; } if (dstatus & SER_CTS) icount->cts++; wake_up_interruptible(&port->delta_msr_wait); } if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) printk("ttyS%d CD now %s...", info->line, (!(status & SER_DCD)) ? "on" : "off"); #endif if (!(status & SER_DCD)) wake_up_interruptible(&port->open_wait); else { #ifdef SERIAL_DEBUG_OPEN printk("doing serial hangup..."); #endif if (port->tty) tty_hangup(port->tty); } } if (tty_port_cts_enabled(port)) { if (port->tty->hw_stopped) { if (!(status & SER_CTS)) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx start..."); #endif port->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(); tty_wakeup(port->tty); return; } } else { if ((status & SER_CTS)) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx stop..."); #endif port->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 irqreturn_t ser_vbl_int( int irq, void *data) { /* vbl is just a periodic interrupt we tie into to update modem status */ struct serial_state *info = data; /* * 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); return IRQ_HANDLED; } static irqreturn_t ser_rx_int(int irq, void *dev_id) { struct serial_state *info = dev_id; #ifdef SERIAL_DEBUG_INTR printk("ser_rx_int..."); #endif if (!info->tport.tty) return IRQ_NONE; receive_chars(info); #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif return IRQ_HANDLED; } static irqreturn_t ser_tx_int(int irq, void *dev_id) { struct serial_state *info = dev_id; if (custom.serdatr & SDR_TBE) { #ifdef SERIAL_DEBUG_INTR printk("ser_tx_int..."); #endif if (!info->tport.tty) return IRQ_NONE; transmit_chars(info); #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } return IRQ_HANDLED; } /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * --------------------------------------------------------------- * 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 tty_struct *tty, struct serial_state *info) { struct tty_port *port = &info->tport; unsigned long flags; int retval=0; unsigned long page; page = get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; local_irq_save(flags); if (port->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()) { set_bit(TTY_IO_ERROR, &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); info->MCR = 0; if (C_BAUD(tty)) info->MCR = SER_DTR | SER_RTS; rtsdtr_ctrl(info->MCR); clear_bit(TTY_IO_ERROR, &tty->flags); info->xmit.head = info->xmit.tail = 0; /* * Set up the tty->alt_speed kludge */ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) tty->alt_speed = 57600; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) tty->alt_speed = 115200; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) tty->alt_speed = 230400; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) tty->alt_speed = 460800; /* * and set the speed of the serial port */ change_speed(tty, info, NULL); port->flags |= ASYNC_INITIALIZED; local_irq_restore(flags); return 0; errout: local_irq_restore(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 tty_struct *tty, struct serial_state *info) { unsigned long flags; struct serial_state *state; if (!(info->tport.flags & ASYNC_INITIALIZED)) return; state = info; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d ....\n", info->line); #endif local_irq_save(flags); /* 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->tport.delta_msr_wait); /* * 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 = NULL; } info->IER = 0; custom.intena = IF_RBF | IF_TBE; mb(); /* disable break condition */ custom.adkcon = AC_UARTBRK; mb(); if (tty->termios.c_cflag & HUPCL) info->MCR &= ~(SER_DTR|SER_RTS); rtsdtr_ctrl(info->MCR); set_bit(TTY_IO_ERROR, &tty->flags); info->tport.flags &= ~ASYNC_INITIALIZED; local_irq_restore(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 tty_struct *tty, struct serial_state *info, struct ktermios *old_termios) { struct tty_port *port = &info->tport; int quot = 0, baud_base, baud; unsigned cflag, cval = 0; int bits; unsigned long flags; cflag = 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(tty); if (!baud) baud = 9600; /* B0 transition handled in rs_set_termios */ baud_base = info->baud_base; if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) quot = info->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) { /* FIXME: Will need updating for new tty in the end */ tty->termios.c_cflag &= ~CBAUD; tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); baud = tty_get_baud_rate(tty); if (!baud) baud = 9600; if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) quot = info->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 (port->flags & ASYNC_HARDPPS_CD) info->IER |= UART_IER_MSI; if (cflag & CRTSCTS) { port->flags |= ASYNC_CTS_FLOW; info->IER |= UART_IER_MSI; } else port->flags &= ~ASYNC_CTS_FLOW; if (cflag & CLOCAL) port->flags &= ~ASYNC_CHECK_CD; else { port->flags |= ASYNC_CHECK_CD; info->IER |= UART_IER_MSI; } /* TBD: * Does clearing IER_MSI imply that we should disable the VBL interrupt ? */ /* * Set up parity check flag */ info->read_status_mask = UART_LSR_OE | UART_LSR_DR; if (I_INPCK(tty)) info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; if (I_BRKINT(tty) || I_PARMRK(tty)) info->read_status_mask |= UART_LSR_BI; /* * Characters to ignore */ info->ignore_status_mask = 0; if (I_IGNPAR(tty)) info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; if (I_IGNBRK(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(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; local_irq_save(flags); { 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(); } local_irq_restore(flags); } static int rs_put_char(struct tty_struct *tty, unsigned char ch) { struct serial_state *info; unsigned long flags; info = tty->driver_data; if (serial_paranoia_check(info, tty->name, "rs_put_char")) return 0; if (!info->xmit.buf) return 0; local_irq_save(flags); if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) { local_irq_restore(flags); return 0; } info->xmit.buf[info->xmit.head++] = ch; info->xmit.head &= SERIAL_XMIT_SIZE-1; local_irq_restore(flags); return 1; } static void rs_flush_chars(struct tty_struct *tty) { struct serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) return; if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped || !info->xmit.buf) return; local_irq_save(flags); 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(); local_irq_restore(flags); } static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) { int c, ret = 0; struct serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_write")) return 0; if (!info->xmit.buf) return 0; local_irq_save(flags); 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; } local_irq_restore(flags); if (info->xmit.head != info->xmit.tail && !tty->stopped && !tty->hw_stopped && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; local_irq_disable(); custom.intena = IF_SETCLR | IF_TBE; mb(); /* set a pending Tx Interrupt, transmitter should restart now */ custom.intreq = IF_SETCLR | IF_TBE; mb(); local_irq_restore(flags); } return ret; } static int rs_write_room(struct tty_struct *tty) { struct serial_state *info = tty->driver_data; if (serial_paranoia_check(info, tty->name, "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 serial_state *info = tty->driver_data; if (serial_paranoia_check(info, tty->name, "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 serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) return; local_irq_save(flags); info->xmit.head = info->xmit.tail = 0; local_irq_restore(flags); tty_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 serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_send_char")) return; info->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ /* Check this ! */ local_irq_save(flags); 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(); } local_irq_restore(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 serial_state *info = 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->name, "rs_throttle")) return; if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); if (tty->termios.c_cflag & CRTSCTS) info->MCR &= ~SER_RTS; local_irq_save(flags); rtsdtr_ctrl(info->MCR); local_irq_restore(flags); } static void rs_unthrottle(struct tty_struct * tty) { struct serial_state *info = 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->name, "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; local_irq_save(flags); rtsdtr_ctrl(info->MCR); local_irq_restore(flags); } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct tty_struct *tty, struct serial_state *state, struct serial_struct __user * retinfo) { struct serial_struct tmp; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tty_lock(tty); tmp.line = tty->index; tmp.port = state->port; tmp.flags = state->tport.flags; tmp.xmit_fifo_size = state->xmit_fifo_size; tmp.baud_base = state->baud_base; tmp.close_delay = state->tport.close_delay; tmp.closing_wait = state->tport.closing_wait; tmp.custom_divisor = state->custom_divisor; tty_unlock(tty); if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) return -EFAULT; return 0; } static int set_serial_info(struct tty_struct *tty, struct serial_state *state, struct serial_struct __user * new_info) { struct tty_port *port = &state->tport; struct serial_struct new_serial; bool change_spd; int retval = 0; if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; tty_lock(tty); change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || new_serial.custom_divisor != state->custom_divisor; if (new_serial.irq || new_serial.port != state->port || new_serial.xmit_fifo_size != state->xmit_fifo_size) { tty_unlock(tty); return -EINVAL; } if (!serial_isroot()) { if ((new_serial.baud_base != state->baud_base) || (new_serial.close_delay != port->close_delay) || (new_serial.xmit_fifo_size != state->xmit_fifo_size) || ((new_serial.flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) { tty_unlock(tty); return -EPERM; } port->flags = ((port->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) { tty_unlock(tty); 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; port->flags = ((port->flags & ~ASYNC_FLAGS) | (new_serial.flags & ASYNC_FLAGS)); state->custom_divisor = new_serial.custom_divisor; port->close_delay = new_serial.close_delay * HZ/100; port->closing_wait = new_serial.closing_wait * HZ/100; port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; check_and_exit: if (port->flags & ASYNC_INITIALIZED) { if (change_spd) { if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) tty->alt_speed = 57600; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) tty->alt_speed = 115200; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) tty->alt_speed = 230400; if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) tty->alt_speed = 460800; change_speed(tty, state, NULL); } } else retval = startup(tty, state); tty_unlock(tty); 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 serial_state *info, unsigned int __user *value) { unsigned char status; unsigned int result; unsigned long flags; local_irq_save(flags); status = custom.serdatr; mb(); local_irq_restore(flags); result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); if (copy_to_user(value, &result, sizeof(int))) return -EFAULT; return 0; } static int rs_tiocmget(struct tty_struct *tty) { struct serial_state *info = tty->driver_data; unsigned char control, status; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_ioctl")) return -ENODEV; if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; control = info->MCR; local_irq_save(flags); status = ciab.pra; local_irq_restore(flags); return ((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); } static int rs_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_ioctl")) return -ENODEV; if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; local_irq_save(flags); if (set & TIOCM_RTS) info->MCR |= SER_RTS; if (set & TIOCM_DTR) info->MCR |= SER_DTR; if (clear & TIOCM_RTS) info->MCR &= ~SER_RTS; if (clear & TIOCM_DTR) info->MCR &= ~SER_DTR; rtsdtr_ctrl(info->MCR); local_irq_restore(flags); return 0; } /* * rs_break() --- routine which turns the break handling on or off */ static int rs_break(struct tty_struct *tty, int break_state) { struct serial_state *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "rs_break")) return -EINVAL; local_irq_save(flags); if (break_state == -1) custom.adkcon = AC_SETCLR | AC_UARTBRK; else custom.adkcon = AC_UARTBRK; mb(); local_irq_restore(flags); return 0; } /* * 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. */ static int rs_get_icount(struct tty_struct *tty, struct serial_icounter_struct *icount) { struct serial_state *info = tty->driver_data; struct async_icount cnow; unsigned long flags; local_irq_save(flags); cnow = info->icount; local_irq_restore(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; return 0; } static int rs_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { struct serial_state *info = tty->driver_data; struct async_icount cprev, cnow; /* kernel counter temps */ void __user *argp = (void __user *)arg; unsigned long flags; if (serial_paranoia_check(info, tty->name, "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 TIOCGSERIAL: return get_serial_info(tty, info, argp); case TIOCSSERIAL: return set_serial_info(tty, info, argp); case TIOCSERCONFIG: return 0; case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, argp); case TIOCSERGSTRUCT: if (copy_to_user(argp, info, sizeof(struct serial_state))) 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: local_irq_save(flags); /* note the counters on entry */ cprev = info->icount; local_irq_restore(flags); while (1) { interruptible_sleep_on(&info->tport.delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; local_irq_save(flags); cnow = info->icount; /* atomic copy */ local_irq_restore(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 */ 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 ktermios *old_termios) { struct serial_state *info = tty->driver_data; unsigned long flags; unsigned int cflag = tty->termios.c_cflag; change_speed(tty, info, old_termios); /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { info->MCR &= ~(SER_DTR|SER_RTS); local_irq_save(flags); rtsdtr_ctrl(info->MCR); local_irq_restore(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; } local_irq_save(flags); rtsdtr_ctrl(info->MCR); local_irq_restore(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 serial_state *state = tty->driver_data; struct tty_port *port = &state->tport; if (serial_paranoia_check(state, tty->name, "rs_close")) return; if (tty_port_close_start(port, tty, filp) == 0) return; /* * 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. */ state->read_status_mask &= ~UART_LSR_DR; if (port->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, state->timeout); } shutdown(tty, state); rs_flush_buffer(tty); tty_ldisc_flush(tty); port->tty = NULL; tty_port_close_end(port, tty); } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct serial_state *info = tty->driver_data; unsigned long orig_jiffies, char_time; int lsr; if (serial_paranoia_check(info, tty->name, "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_t(unsigned long, 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 msleep_interruptible(jiffies_to_msecs(char_time)); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } __set_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 serial_state *info = tty->driver_data; if (serial_paranoia_check(info, tty->name, "rs_hangup")) return; rs_flush_buffer(tty); shutdown(tty, info); info->tport.count = 0; info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; info->tport.tty = NULL; wake_up_interruptible(&info->tport.open_wait); } /* * 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 serial_state *info = rs_table + tty->index; struct tty_port *port = &info->tport; int retval; port->count++; port->tty = tty; tty->driver_data = info; tty->port = port; if (serial_paranoia_check(info, tty->name, "rs_open")) return -ENODEV; port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; retval = startup(tty, info); if (retval) { return retval; } return tty_port_block_til_ready(port, tty, filp); } /* * /proc fs routines.... */ static inline void line_info(struct seq_file *m, int line, struct serial_state *state) { char stat_buf[30], control, status; unsigned long flags; seq_printf(m, "%d: uart:amiga_builtin", line); local_irq_save(flags); status = ciab.pra; control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; local_irq_restore(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 (state->quot) seq_printf(m, " baud:%d", state->baud_base / state->quot); seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); if (state->icount.frame) seq_printf(m, " fe:%d", state->icount.frame); if (state->icount.parity) seq_printf(m, " pe:%d", state->icount.parity); if (state->icount.brk) seq_printf(m, " brk:%d", state->icount.brk); if (state->icount.overrun) seq_printf(m, " oe:%d", state->icount.overrun); /* * Last thing is the RS-232 status lines */ seq_printf(m, " %s\n", stat_buf+1); } static int rs_proc_show(struct seq_file *m, void *v) { seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); line_info(m, 0, &rs_table[0]); return 0; } static int rs_proc_open(struct inode *inode, struct file *file) { return single_open(file, rs_proc_show, NULL); } static const struct file_operations rs_proc_fops = { .owner = THIS_MODULE, .open = rs_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; /* * --------------------------------------------------------------------- * 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 void show_serial_version(void) { printk(KERN_INFO "%s version %s\n", serial_name, serial_version); } static const struct tty_operations serial_ops = { .open = rs_open, .close = rs_close, .write = rs_write, .put_char = rs_put_char, .flush_chars = rs_flush_chars, .write_room = rs_write_room, .chars_in_buffer = rs_chars_in_buffer, .flush_buffer = rs_flush_buffer, .ioctl = rs_ioctl, .throttle = rs_throttle, .unthrottle = rs_unthrottle, .set_termios = rs_set_termios, .stop = rs_stop, .start = rs_start, .hangup = rs_hangup, .break_ctl = rs_break, .send_xchar = rs_send_xchar, .wait_until_sent = rs_wait_until_sent, .tiocmget = rs_tiocmget, .tiocmset = rs_tiocmset, .get_icount = rs_get_icount, .proc_fops = &rs_proc_fops, }; static int amiga_carrier_raised(struct tty_port *port) { return !(ciab.pra & SER_DCD); } static void amiga_dtr_rts(struct tty_port *port, int raise) { struct serial_state *info = container_of(port, struct serial_state, tport); unsigned long flags; if (raise) info->MCR |= SER_DTR|SER_RTS; else info->MCR &= ~(SER_DTR|SER_RTS); local_irq_save(flags); rtsdtr_ctrl(info->MCR); local_irq_restore(flags); } static const struct tty_port_operations amiga_port_ops = { .carrier_raised = amiga_carrier_raised, .dtr_rts = amiga_dtr_rts, }; /* * The serial driver boot-time initialization code! */ static int __init amiga_serial_probe(struct platform_device *pdev) { unsigned long flags; struct serial_state * state; int error; serial_driver = alloc_tty_driver(NR_PORTS); if (!serial_driver) return -ENOMEM; show_serial_version(); /* Initialize the tty_driver structure */ serial_driver->driver_name = "amiserial"; serial_driver->name = "ttyS"; serial_driver->major = TTY_MAJOR; serial_driver->minor_start = 64; 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; tty_set_operations(serial_driver, &serial_ops); state = rs_table; state->port = (int)&custom.serdatr; /* Just to give it a value */ state->custom_divisor = 0; 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; tty_port_init(&state->tport); state->tport.ops = &amiga_port_ops; tty_port_link_device(&state->tport, serial_driver, 0); error = tty_register_driver(serial_driver); if (error) goto fail_put_tty_driver; printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); /* Hardware set up */ state->baud_base = amiga_colorclock; state->xmit_fifo_size = 1; /* set ISRs, and then disable the rx interrupts */ error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); if (error) goto fail_unregister; error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, "serial RX", state); if (error) goto fail_free_irq; local_irq_save(flags); /* turn off Rx and Tx interrupts */ custom.intena = IF_RBF | IF_TBE; mb(); /* clear any pending interrupt */ custom.intreq = IF_RBF | IF_TBE; mb(); local_irq_restore(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 */ platform_set_drvdata(pdev, state); return 0; fail_free_irq: free_irq(IRQ_AMIGA_TBE, state); fail_unregister: tty_unregister_driver(serial_driver); fail_put_tty_driver: tty_port_destroy(&state->tport); put_tty_driver(serial_driver); return error; } static int __exit amiga_serial_remove(struct platform_device *pdev) { int error; struct serial_state *state = platform_get_drvdata(pdev); /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ if ((error = tty_unregister_driver(serial_driver))) printk("SERIAL: failed to unregister serial driver (%d)\n", error); put_tty_driver(serial_driver); tty_port_destroy(&state->tport); free_irq(IRQ_AMIGA_TBE, state); free_irq(IRQ_AMIGA_RBF, state); platform_set_drvdata(pdev, NULL); return error; } static struct platform_driver amiga_serial_driver = { .remove = __exit_p(amiga_serial_remove), .driver = { .name = "amiga-serial", .owner = THIS_MODULE, }, }; module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ 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 struct tty_driver *serial_console_device(struct console *c, int *index) { *index = 0; return serial_driver; } static struct console sercons = { .name = "ttyS", .write = serial_console_write, .device = serial_console_device, .flags = CON_PRINTBUFFER, .index = -1, }; /* * Register console. */ static int __init amiserial_console_init(void) { register_console(&sercons); return 0; } console_initcall(amiserial_console_init); #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:amiga-serial");