| /* |
| * 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/delay.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 */ |
| |
| #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->flags), serial_driver->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/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/smp_lock.h> |
| #include <linux/init.h> |
| #include <linux/bitops.h> |
| #include <linux/platform_device.h> |
| |
| #include <asm/setup.h> |
| |
| #include <asm/system.h> |
| |
| #include <asm/irq.h> |
| |
| #include <asm/amigahw.h> |
| #include <asm/amigaints.h> |
| |
| #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 struct async_struct *IRQ_ports; |
| |
| static unsigned char current_ctl_bits; |
| |
| static void change_speed(struct async_struct *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 <asm/uaccess.h> |
| |
| #define serial_isroot() (capable(CAP_SYS_ADMIN)) |
| |
| |
| static inline int serial_paranoia_check(struct async_struct *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 async_struct *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 async_struct *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 |
| * ----------------------------------------------------------------------- |
| */ |
| |
| /* |
| * This routine is used by the interrupt handler to schedule |
| * processing in the software interrupt portion of the driver. |
| */ |
| static void rs_sched_event(struct async_struct *info, |
| int event) |
| { |
| info->event |= 1 << event; |
| tasklet_schedule(&info->tlet); |
| } |
| |
| static void receive_chars(struct async_struct *info) |
| { |
| int status; |
| int serdatr; |
| struct tty_struct *tty = info->tty; |
| unsigned char ch, flag; |
| struct async_icount *icount; |
| int oe = 0; |
| |
| 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; |
| 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->flags & ASYNC_SAK) |
| do_SAK(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(tty, ch, flag); |
| if (oe == 1) |
| tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| tty_flip_buffer_push(tty); |
| out: |
| return; |
| } |
| |
| static 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 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%d CD now %s...", info->line, |
| (!(status & SER_DCD)) ? "on" : "off"); |
| #endif |
| if (!(status & SER_DCD)) |
| wake_up_interruptible(&info->open_wait); |
| else { |
| #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 irqreturn_t ser_vbl_int( int irq, void *data) |
| { |
| /* 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); |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t ser_rx_int(int irq, void *dev_id) |
| { |
| struct async_struct * info; |
| |
| #ifdef SERIAL_DEBUG_INTR |
| printk("ser_rx_int..."); |
| #endif |
| |
| info = IRQ_ports; |
| if (!info || !info->tty) |
| return IRQ_NONE; |
| |
| receive_chars(info); |
| info->last_active = jiffies; |
| #ifdef SERIAL_DEBUG_INTR |
| printk("end.\n"); |
| #endif |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t ser_tx_int(int irq, void *dev_id) |
| { |
| 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 IRQ_NONE; |
| |
| transmit_chars(info); |
| info->last_active = jiffies; |
| #ifdef SERIAL_DEBUG_INTR |
| printk("end.\n"); |
| #endif |
| } |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * ------------------------------------------------------------------- |
| * 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_softint(unsigned long 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)) |
| tty_wakeup(tty); |
| } |
| |
| /* |
| * --------------------------------------------------------------- |
| * 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_zeroed_page(GFP_KERNEL); |
| if (!page) |
| return -ENOMEM; |
| |
| local_irq_save(flags); |
| |
| 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, NULL); |
| |
| info->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 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 |
| |
| 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->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 = NULL; |
| } |
| |
| 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; |
| 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 async_struct *info, |
| struct ktermios *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) { |
| /* FIXME: Will need updating for new tty in the end */ |
| 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 disable the VBL interrupt ? |
| */ |
| |
| /* |
| * Set up parity check flag |
| */ |
| |
| 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; |
| 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(); |
| } |
| |
| info->LCR = cval; /* Save LCR */ |
| local_irq_restore(flags); |
| } |
| |
| static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
| { |
| struct async_struct *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 async_struct *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 async_struct *info; |
| unsigned long flags; |
| |
| info = tty->driver_data; |
| |
| 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 async_struct *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 async_struct *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 async_struct *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 async_struct *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 async_struct *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 async_struct *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 async_struct * info, |
| struct serial_struct __user * retinfo) |
| { |
| struct serial_struct tmp; |
| struct serial_state *state = info->state; |
| |
| if (!retinfo) |
| return -EFAULT; |
| memset(&tmp, 0, sizeof(tmp)); |
| tty_lock(); |
| 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; |
| tty_unlock(); |
| if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int set_serial_info(struct async_struct * info, |
| struct serial_struct __user * 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; |
| |
| tty_lock(); |
| 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)) { |
| tty_unlock(); |
| 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) { |
| tty_unlock(); |
| 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, NULL); |
| } |
| } else |
| retval = startup(info); |
| tty_unlock(); |
| 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 __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 file *file) |
| { |
| struct async_struct * 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, struct file *file, |
| unsigned int set, unsigned int clear) |
| { |
| struct async_struct * 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 async_struct * 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; |
| } |
| |
| |
| static int rs_ioctl(struct tty_struct *tty, struct file * file, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct async_struct * info = tty->driver_data; |
| struct async_icount cprev, cnow; /* kernel counter temps */ |
| struct serial_icounter_struct icount; |
| 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(info, argp); |
| case TIOCSSERIAL: |
| return set_serial_info(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 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: |
| local_irq_save(flags); |
| /* note the counters on entry */ |
| cprev = info->state->icount; |
| local_irq_restore(flags); |
| while (1) { |
| interruptible_sleep_on(&info->delta_msr_wait); |
| /* see if a signal did it */ |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| local_irq_save(flags); |
| cnow = info->state->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 */ |
| |
| /* |
| * 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: |
| local_irq_save(flags); |
| cnow = info->state->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; |
| |
| if (copy_to_user(argp, &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 ktermios *old_termios) |
| { |
| struct async_struct *info = tty->driver_data; |
| unsigned long flags; |
| unsigned int cflag = tty->termios->c_cflag; |
| |
| change_speed(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 async_struct * info = tty->driver_data; |
| struct serial_state *state; |
| unsigned long flags; |
| |
| if (!info || serial_paranoia_check(info, tty->name, "rs_close")) |
| return; |
| |
| state = info->state; |
| |
| local_irq_save(flags); |
| |
| if (tty_hung_up_p(filp)) { |
| DBG_CNT("before DEC-hung"); |
| local_irq_restore(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"); |
| local_irq_restore(flags); |
| return; |
| } |
| info->flags |= ASYNC_CLOSING; |
| /* |
| * 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); |
| rs_flush_buffer(tty); |
| |
| tty_ldisc_flush(tty); |
| tty->closing = 0; |
| info->event = 0; |
| info->tty = NULL; |
| if (info->blocked_open) { |
| if (info->close_delay) { |
| msleep_interruptible(jiffies_to_msecs(info->close_delay)); |
| } |
| wake_up_interruptible(&info->open_wait); |
| } |
| info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| wake_up_interruptible(&info->close_wait); |
| local_irq_restore(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 = tty->driver_data; |
| unsigned long orig_jiffies, char_time; |
| int tty_was_locked = tty_locked(); |
| 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; |
| |
| /* |
| * tty_wait_until_sent is called from lots of places, |
| * with or without the BTM. |
| */ |
| if (!tty_was_locked) |
| tty_lock(); |
| /* |
| * 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); |
| if (!tty_was_locked) |
| tty_unlock(); |
| #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 = tty->driver_data; |
| struct serial_state *state = info->state; |
| |
| if (serial_paranoia_check(info, tty->name, "rs_hangup")) |
| return; |
| |
| state = info->state; |
| |
| rs_flush_buffer(tty); |
| shutdown(info); |
| info->event = 0; |
| state->count = 0; |
| info->flags &= ~ASYNC_NORMAL_ACTIVE; |
| info->tty = NULL; |
| 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 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))) { |
| info->flags |= ASYNC_NORMAL_ACTIVE; |
| return 0; |
| } |
| |
| 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 |
| local_irq_save(flags); |
| if (!tty_hung_up_p(filp)) { |
| extra_count = 1; |
| state->count--; |
| } |
| local_irq_restore(flags); |
| info->blocked_open++; |
| while (1) { |
| local_irq_save(flags); |
| if (tty->termios->c_cflag & CBAUD) |
| rtsdtr_ctrl(SER_DTR|SER_RTS); |
| local_irq_restore(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_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(); |
| } |
| __set_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 = kzalloc(sizeof(struct async_struct), GFP_KERNEL); |
| if (!info) { |
| sstate->count--; |
| return -ENOMEM; |
| } |
| #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; |
| tasklet_init(&info->tlet, do_softint, (unsigned long)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; |
| |
| line = tty->index; |
| if ((line < 0) || (line >= NR_PORTS)) { |
| return -ENODEV; |
| } |
| retval = get_async_struct(line, &info); |
| if (retval) { |
| return retval; |
| } |
| tty->driver_data = info; |
| info->tty = tty; |
| if (serial_paranoia_check(info, tty->name, "rs_open")) |
| return -ENODEV; |
| |
| #ifdef SERIAL_DEBUG_OPEN |
| printk("rs_open %s, count = %d\n", tty->name, info->state->count); |
| #endif |
| info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| |
| /* |
| * 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; |
| } |
| |
| #ifdef SERIAL_DEBUG_OPEN |
| printk("rs_open %s successful...", tty->name); |
| #endif |
| return 0; |
| } |
| |
| /* |
| * /proc fs routines.... |
| */ |
| |
| static inline void line_info(struct seq_file *m, struct serial_state *state) |
| { |
| struct async_struct *info = state->info, scr_info; |
| char stat_buf[30], control, status; |
| unsigned long flags; |
| |
| seq_printf(m, "%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 = NULL; |
| } |
| local_irq_save(flags); |
| status = ciab.pra; |
| control = info ? info->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 (info->quot) { |
| seq_printf(m, " baud:%d", state->baud_base / info->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, &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, |
| .proc_fops = &rs_proc_fops, |
| }; |
| |
| /* |
| * 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(1); |
| if (!serial_driver) |
| return -ENOMEM; |
| |
| IRQ_ports = NULL; |
| |
| show_serial_version(); |
| |
| /* Initialize the tty_driver structure */ |
| |
| serial_driver->owner = THIS_MODULE; |
| 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); |
| |
| error = tty_register_driver(serial_driver); |
| if (error) |
| goto fail_put_tty_driver; |
| |
| 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->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; |
| |
| printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n", |
| state->line); |
| |
| /* 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, IRQF_DISABLED, |
| "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: |
| 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); |
| struct async_struct *info = state->info; |
| |
| /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ |
| tasklet_kill(&info->tlet); |
| if ((error = tty_unregister_driver(serial_driver))) |
| printk("SERIAL: failed to unregister serial driver (%d)\n", |
| error); |
| put_tty_driver(serial_driver); |
| |
| rs_table[0].info = NULL; |
| kfree(info); |
| |
| free_irq(IRQ_AMIGA_TBE, rs_table); |
| free_irq(IRQ_AMIGA_RBF, rs_table); |
| |
| 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, |
| }, |
| }; |
| |
| static int __init amiga_serial_init(void) |
| { |
| return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe); |
| } |
| |
| module_init(amiga_serial_init); |
| |
| static void __exit amiga_serial_exit(void) |
| { |
| platform_driver_unregister(&amiga_serial_driver); |
| } |
| |
| module_exit(amiga_serial_exit); |
| |
| |
| #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"); |