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Diffstat (limited to 'drivers/char/specialix.c')
| -rw-r--r-- | drivers/char/specialix.c | 2610 |
1 files changed, 2610 insertions, 0 deletions
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c new file mode 100644 index 000000000000..c789d5ceac76 --- /dev/null +++ b/drivers/char/specialix.c @@ -0,0 +1,2610 @@ +/* + * specialix.c -- specialix IO8+ multiport serial driver. + * + * Copyright (C) 1997 Roger Wolff (R.E.Wolff@BitWizard.nl) + * Copyright (C) 1994-1996 Dmitry Gorodchanin (pgmdsg@ibi.com) + * + * Specialix pays for the development and support of this driver. + * Please DO contact io8-linux@specialix.co.uk if you require + * support. But please read the documentation (specialix.txt) + * first. + * + * This driver was developped in the BitWizard linux device + * driver service. If you require a linux device driver for your + * product, please contact devices@BitWizard.nl for a quote. + * + * This code is firmly based on the riscom/8 serial driver, + * written by Dmitry Gorodchanin. The specialix IO8+ card + * programming information was obtained from the CL-CD1865 Data + * Book, and Specialix document number 6200059: IO8+ Hardware + * Functional Specification. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be + * useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR + * PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + * Revision history: + * + * Revision 1.0: April 1st 1997. + * Initial release for alpha testing. + * Revision 1.1: April 14th 1997. + * Incorporated Richard Hudsons suggestions, + * removed some debugging printk's. + * Revision 1.2: April 15th 1997. + * Ported to 2.1.x kernels. + * Revision 1.3: April 17th 1997 + * Backported to 2.0. (Compatibility macros). + * Revision 1.4: April 18th 1997 + * Fixed DTR/RTS bug that caused the card to indicate + * "don't send data" to a modem after the password prompt. + * Fixed bug for premature (fake) interrupts. + * Revision 1.5: April 19th 1997 + * fixed a minor typo in the header file, cleanup a little. + * performance warnings are now MAXed at once per minute. + * Revision 1.6: May 23 1997 + * Changed the specialix=... format to include interrupt. + * Revision 1.7: May 27 1997 + * Made many more debug printk's a compile time option. + * Revision 1.8: Jul 1 1997 + * port to linux-2.1.43 kernel. + * Revision 1.9: Oct 9 1998 + * Added stuff for the IO8+/PCI version. + * Revision 1.10: Oct 22 1999 / Jan 21 2000. + * Added stuff for setserial. + * Nicolas Mailhot (Nicolas.Mailhot@email.enst.fr) + * + */ + +#define VERSION "1.11" + + +/* + * There is a bunch of documentation about the card, jumpers, config + * settings, restrictions, cables, device names and numbers in + * Documentation/specialix.txt + */ + +#include <linux/config.h> +#include <linux/module.h> + +#include <asm/io.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/tty.h> +#include <linux/mm.h> +#include <linux/serial.h> +#include <linux/fcntl.h> +#include <linux/major.h> +#include <linux/delay.h> +#include <linux/version.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <asm/uaccess.h> + +#include "specialix_io8.h" +#include "cd1865.h" + + +/* + This driver can spew a whole lot of debugging output at you. If you + need maximum performance, you should disable the DEBUG define. To + aid in debugging in the field, I'm leaving the compile-time debug + features enabled, and disable them "runtime". That allows me to + instruct people with problems to enable debugging without requiring + them to recompile... +*/ +#define DEBUG + +static int sx_debug; +static int sx_rxfifo = SPECIALIX_RXFIFO; + +#ifdef DEBUG +#define dprintk(f, str...) if (sx_debug & f) printk (str) +#else +#define dprintk(f, str...) /* nothing */ +#endif + +#define SX_DEBUG_FLOW 0x0001 +#define SX_DEBUG_DATA 0x0002 +#define SX_DEBUG_PROBE 0x0004 +#define SX_DEBUG_CHAN 0x0008 +#define SX_DEBUG_INIT 0x0010 +#define SX_DEBUG_RX 0x0020 +#define SX_DEBUG_TX 0x0040 +#define SX_DEBUG_IRQ 0x0080 +#define SX_DEBUG_OPEN 0x0100 +#define SX_DEBUG_TERMIOS 0x0200 +#define SX_DEBUG_SIGNALS 0x0400 +#define SX_DEBUG_FIFO 0x0800 + + +#define func_enter() dprintk (SX_DEBUG_FLOW, "io8: enter %s\n",__FUNCTION__) +#define func_exit() dprintk (SX_DEBUG_FLOW, "io8: exit %s\n", __FUNCTION__) + +#define jiffies_from_ms(a) ((((a) * HZ)/1000)+1) + + +/* Configurable options: */ + +/* Am I paranoid or not ? ;-) */ +#define SPECIALIX_PARANOIA_CHECK + +/* Do I trust the IRQ from the card? (enabeling it doesn't seem to help) + When the IRQ routine leaves the chip in a state that is keeps on + requiring attention, the timer doesn't help either. */ +#undef SPECIALIX_TIMER + +#ifdef SPECIALIX_TIMER +static int sx_poll = HZ; +#endif + + + +/* + * The following defines are mostly for testing purposes. But if you need + * some nice reporting in your syslog, you can define them also. + */ +#undef SX_REPORT_FIFO +#undef SX_REPORT_OVERRUN + + + +#ifdef CONFIG_SPECIALIX_RTSCTS +#define SX_CRTSCTS(bla) 1 +#else +#define SX_CRTSCTS(tty) C_CRTSCTS(tty) +#endif + + +/* Used to be outb (0xff, 0x80); */ +#define short_pause() udelay (1) + + +#define SPECIALIX_LEGAL_FLAGS \ + (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \ + ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \ + ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP) + +#undef RS_EVENT_WRITE_WAKEUP +#define RS_EVENT_WRITE_WAKEUP 0 + +static struct tty_driver *specialix_driver; +static unsigned char * tmp_buf; +static DECLARE_MUTEX(tmp_buf_sem); + +static unsigned long baud_table[] = { + 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, + 9600, 19200, 38400, 57600, 115200, 0, +}; + +static struct specialix_board sx_board[SX_NBOARD] = { + { 0, SX_IOBASE1, 9, }, + { 0, SX_IOBASE2, 11, }, + { 0, SX_IOBASE3, 12, }, + { 0, SX_IOBASE4, 15, }, +}; + +static struct specialix_port sx_port[SX_NBOARD * SX_NPORT]; + + +#ifdef SPECIALIX_TIMER +static struct timer_list missed_irq_timer; +static irqreturn_t sx_interrupt(int irq, void * dev_id, struct pt_regs * regs); +#endif + + + +static inline int sx_paranoia_check(struct specialix_port const * port, + char *name, const char *routine) +{ +#ifdef SPECIALIX_PARANOIA_CHECK + static const char *badmagic = + KERN_ERR "sx: Warning: bad specialix port magic number for device %s in %s\n"; + static const char *badinfo = + KERN_ERR "sx: Warning: null specialix port for device %s in %s\n"; + + if (!port) { + printk(badinfo, name, routine); + return 1; + } + if (port->magic != SPECIALIX_MAGIC) { + printk(badmagic, name, routine); + return 1; + } +#endif + return 0; +} + + +/* + * + * Service functions for specialix IO8+ driver. + * + */ + +/* Get board number from pointer */ +static inline int board_No (struct specialix_board * bp) +{ + return bp - sx_board; +} + + +/* Get port number from pointer */ +static inline int port_No (struct specialix_port const * port) +{ + return SX_PORT(port - sx_port); +} + + +/* Get pointer to board from pointer to port */ +static inline struct specialix_board * port_Board(struct specialix_port const * port) +{ + return &sx_board[SX_BOARD(port - sx_port)]; +} + + +/* Input Byte from CL CD186x register */ +static inline unsigned char sx_in(struct specialix_board * bp, unsigned short reg) +{ + bp->reg = reg | 0x80; + outb (reg | 0x80, bp->base + SX_ADDR_REG); + return inb (bp->base + SX_DATA_REG); +} + + +/* Output Byte to CL CD186x register */ +static inline void sx_out(struct specialix_board * bp, unsigned short reg, + unsigned char val) +{ + bp->reg = reg | 0x80; + outb (reg | 0x80, bp->base + SX_ADDR_REG); + outb (val, bp->base + SX_DATA_REG); +} + + +/* Input Byte from CL CD186x register */ +static inline unsigned char sx_in_off(struct specialix_board * bp, unsigned short reg) +{ + bp->reg = reg; + outb (reg, bp->base + SX_ADDR_REG); + return inb (bp->base + SX_DATA_REG); +} + + +/* Output Byte to CL CD186x register */ +static inline void sx_out_off(struct specialix_board * bp, unsigned short reg, + unsigned char val) +{ + bp->reg = reg; + outb (reg, bp->base + SX_ADDR_REG); + outb (val, bp->base + SX_DATA_REG); +} + + +/* Wait for Channel Command Register ready */ +static inline void sx_wait_CCR(struct specialix_board * bp) +{ + unsigned long delay, flags; + unsigned char ccr; + + for (delay = SX_CCR_TIMEOUT; delay; delay--) { + spin_lock_irqsave(&bp->lock, flags); + ccr = sx_in(bp, CD186x_CCR); + spin_unlock_irqrestore(&bp->lock, flags); + if (!ccr) + return; + udelay (1); + } + + printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp)); +} + + +/* Wait for Channel Command Register ready */ +static inline void sx_wait_CCR_off(struct specialix_board * bp) +{ + unsigned long delay; + unsigned char crr; + unsigned long flags; + + for (delay = SX_CCR_TIMEOUT; delay; delay--) { + spin_lock_irqsave(&bp->lock, flags); + crr = sx_in_off(bp, CD186x_CCR); + spin_unlock_irqrestore(&bp->lock, flags); + if (!crr) + return; + udelay (1); + } + + printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp)); +} + + +/* + * specialix IO8+ IO range functions. + */ + +static inline int sx_check_io_range(struct specialix_board * bp) +{ + return check_region (bp->base, SX_IO_SPACE); +} + + +static inline void sx_request_io_range(struct specialix_board * bp) +{ + request_region(bp->base, + bp->flags&SX_BOARD_IS_PCI?SX_PCI_IO_SPACE:SX_IO_SPACE, + "specialix IO8+" ); +} + + +static inline void sx_release_io_range(struct specialix_board * bp) +{ + release_region(bp->base, + bp->flags&SX_BOARD_IS_PCI?SX_PCI_IO_SPACE:SX_IO_SPACE); +} + + +/* Must be called with enabled interrupts */ +/* Ugly. Very ugly. Don't use this for anything else than initialization + code */ +static inline void sx_long_delay(unsigned long delay) +{ + unsigned long i; + + for (i = jiffies + delay; time_after(i, jiffies); ) ; +} + + + +/* Set the IRQ using the RTS lines that run to the PAL on the board.... */ +static int sx_set_irq ( struct specialix_board *bp) +{ + int virq; + int i; + unsigned long flags; + + if (bp->flags & SX_BOARD_IS_PCI) + return 1; + switch (bp->irq) { + /* In the same order as in the docs... */ + case 15: virq = 0;break; + case 12: virq = 1;break; + case 11: virq = 2;break; + case 9: virq = 3;break; + default: printk (KERN_ERR "Speclialix: cannot set irq to %d.\n", bp->irq); + return 0; + } + spin_lock_irqsave(&bp->lock, flags); + for (i=0;i<2;i++) { + sx_out(bp, CD186x_CAR, i); + sx_out(bp, CD186x_MSVRTS, ((virq >> i) & 0x1)? MSVR_RTS:0); + } + spin_unlock_irqrestore(&bp->lock, flags); + return 1; +} + + +/* Reset and setup CD186x chip */ +static int sx_init_CD186x(struct specialix_board * bp) +{ + unsigned long flags; + int scaler; + int rv = 1; + + func_enter(); + sx_wait_CCR_off(bp); /* Wait for CCR ready */ + spin_lock_irqsave(&bp->lock, flags); + sx_out_off(bp, CD186x_CCR, CCR_HARDRESET); /* Reset CD186x chip */ + spin_unlock_irqrestore(&bp->lock, flags); + sx_long_delay(HZ/20); /* Delay 0.05 sec */ + spin_lock_irqsave(&bp->lock, flags); + sx_out_off(bp, CD186x_GIVR, SX_ID); /* Set ID for this chip */ + sx_out_off(bp, CD186x_GICR, 0); /* Clear all bits */ + sx_out_off(bp, CD186x_PILR1, SX_ACK_MINT); /* Prio for modem intr */ + sx_out_off(bp, CD186x_PILR2, SX_ACK_TINT); /* Prio for transmitter intr */ + sx_out_off(bp, CD186x_PILR3, SX_ACK_RINT); /* Prio for receiver intr */ + /* Set RegAckEn */ + sx_out_off(bp, CD186x_SRCR, sx_in (bp, CD186x_SRCR) | SRCR_REGACKEN); + + /* Setting up prescaler. We need 4 ticks per 1 ms */ + scaler = SX_OSCFREQ/SPECIALIX_TPS; + + sx_out_off(bp, CD186x_PPRH, scaler >> 8); + sx_out_off(bp, CD186x_PPRL, scaler & 0xff); + spin_unlock_irqrestore(&bp->lock, flags); + + if (!sx_set_irq (bp)) { + /* Figure out how to pass this along... */ + printk (KERN_ERR "Cannot set irq to %d.\n", bp->irq); + rv = 0; + } + + func_exit(); + return rv; +} + + +static int read_cross_byte (struct specialix_board *bp, int reg, int bit) +{ + int i; + int t; + unsigned long flags; + + spin_lock_irqsave(&bp->lock, flags); + for (i=0, t=0;i<8;i++) { + sx_out_off (bp, CD186x_CAR, i); + if (sx_in_off (bp, reg) & bit) + t |= 1 << i; + } + spin_unlock_irqrestore(&bp->lock, flags); + + return t; +} + + +#ifdef SPECIALIX_TIMER +void missed_irq (unsigned long data) +{ + unsigned char irq; + unsigned long flags; + struct specialix_board *bp = (struct specialix_board *)data; + + spin_lock_irqsave(&bp->lock, flags); + irq = sx_in ((struct specialix_board *)data, CD186x_SRSR) & + (SRSR_RREQint | + SRSR_TREQint | + SRSR_MREQint); + spin_unlock_irqrestore(&bp->lock, flags); + if (irq) { + printk (KERN_INFO "Missed interrupt... Calling int from timer. \n"); + sx_interrupt (((struct specialix_board *)data)->irq, + (void*)data, NULL); + } + missed_irq_timer.expires = jiffies + sx_poll; + add_timer (&missed_irq_timer); +} +#endif + + + +/* Main probing routine, also sets irq. */ +static int sx_probe(struct specialix_board *bp) +{ + unsigned char val1, val2; +#if 0 + int irqs = 0; + int retries; +#endif + int rev; + int chip; + + func_enter(); + + if (sx_check_io_range(bp)) { + func_exit(); + return 1; + } + + /* Are the I/O ports here ? */ + sx_out_off(bp, CD186x_PPRL, 0x5a); + short_pause (); + val1 = sx_in_off(bp, CD186x_PPRL); + + sx_out_off(bp, CD186x_PPRL, 0xa5); + short_pause (); + val2 = sx_in_off(bp, CD186x_PPRL); + + + if ((val1 != 0x5a) || (val2 != 0xa5)) { + printk(KERN_INFO "sx%d: specialix IO8+ Board at 0x%03x not found.\n", + board_No(bp), bp->base); + func_exit(); + return 1; + } + + /* Check the DSR lines that Specialix uses as board + identification */ + val1 = read_cross_byte (bp, CD186x_MSVR, MSVR_DSR); + val2 = read_cross_byte (bp, CD186x_MSVR, MSVR_RTS); + dprintk (SX_DEBUG_INIT, "sx%d: DSR lines are: %02x, rts lines are: %02x\n", + board_No(bp), val1, val2); + + /* They managed to switch the bit order between the docs and + the IO8+ card. The new PCI card now conforms to old docs. + They changed the PCI docs to reflect the situation on the + old card. */ + val2 = (bp->flags & SX_BOARD_IS_PCI)?0x4d : 0xb2; + if (val1 != val2) { + printk(KERN_INFO "sx%d: specialix IO8+ ID %02x at 0x%03x not found (%02x).\n", + board_No(bp), val2, bp->base, val1); + func_exit(); + return 1; + } + + +#if 0 + /* It's time to find IRQ for this board */ + for (retries = 0; retries < 5 && irqs <= 0; retries++) { + irqs = probe_irq_on(); + sx_init_CD186x(bp); /* Reset CD186x chip */ + sx_out(bp, CD186x_CAR, 2); /* Select port 2 */ + sx_wait_CCR(bp); + sx_out(bp, CD186x_CCR, CCR_TXEN); /* Enable transmitter */ + sx_out(bp, CD186x_IER, IER_TXRDY); /* Enable tx empty intr */ + sx_long_delay(HZ/20); + irqs = probe_irq_off(irqs); + + dprintk (SX_DEBUG_INIT, "SRSR = %02x, ", sx_in(bp, CD186x_SRSR)); + dprintk (SX_DEBUG_INIT, "TRAR = %02x, ", sx_in(bp, CD186x_TRAR)); + dprintk (SX_DEBUG_INIT, "GIVR = %02x, ", sx_in(bp, CD186x_GIVR)); + dprintk (SX_DEBUG_INIT, "GICR = %02x, ", sx_in(bp, CD186x_GICR)); + dprintk (SX_DEBUG_INIT, "\n"); + + /* Reset CD186x again */ + if (!sx_init_CD186x(bp)) { + /* Hmmm. This is dead code anyway. */ + } + + dprintk (SX_DEBUG_INIT "val1 = %02x, val2 = %02x, val3 = %02x.\n", + val1, val2, val3); + + } + +#if 0 + if (irqs <= 0) { + printk(KERN_ERR "sx%d: Can't find IRQ for specialix IO8+ board at 0x%03x.\n", + board_No(bp), bp->base); + func_exit(); + return 1; + } +#endif + printk (KERN_INFO "Started with irq=%d, but now have irq=%d.\n", bp->irq, irqs); + if (irqs > 0) + bp->irq = irqs; +#endif + /* Reset CD186x again */ + if (!sx_init_CD186x(bp)) { + func_exit(); + return -EIO; + } + + sx_request_io_range(bp); + bp->flags |= SX_BOARD_PRESENT; + + /* Chip revcode pkgtype + GFRCR SRCR bit 7 + CD180 rev B 0x81 0 + CD180 rev C 0x82 0 + CD1864 rev A 0x82 1 + CD1865 rev A 0x83 1 -- Do not use!!! Does not work. + CD1865 rev B 0x84 1 + -- Thanks to Gwen Wang, Cirrus Logic. + */ + + switch (sx_in_off(bp, CD186x_GFRCR)) { + case 0x82:chip = 1864;rev='A';break; + case 0x83:chip = 1865;rev='A';break; + case 0x84:chip = 1865;rev='B';break; + case 0x85:chip = 1865;rev='C';break; /* Does not exist at this time */ + default:chip=-1;rev='x'; + } + + dprintk (SX_DEBUG_INIT, " GFCR = 0x%02x\n", sx_in_off(bp, CD186x_GFRCR) ); + +#ifdef SPECIALIX_TIMER + init_timer (&missed_irq_timer); + missed_irq_timer.function = missed_irq; + missed_irq_timer.data = (unsigned long) bp; + missed_irq_timer.expires = jiffies + sx_poll; + add_timer (&missed_irq_timer); +#endif + + printk(KERN_INFO"sx%d: specialix IO8+ board detected at 0x%03x, IRQ %d, CD%d Rev. %c.\n", + board_No(bp), + bp->base, bp->irq, + chip, rev); + + func_exit(); + return 0; +} + +/* + * + * Interrupt processing routines. + * */ + +static inline void sx_mark_event(struct specialix_port * port, int event) +{ + func_enter(); + + set_bit(event, &port->event); + schedule_work(&port->tqueue); + + func_exit(); +} + + +static inline struct specialix_port * sx_get_port(struct specialix_board * bp, + unsigned char const * what) +{ + unsigned char channel; + struct specialix_port * port = NULL; + + channel = sx_in(bp, CD186x_GICR) >> GICR_CHAN_OFF; + dprintk (SX_DEBUG_CHAN, "channel: %d\n", channel); + if (channel < CD186x_NCH) { + port = &sx_port[board_No(bp) * SX_NPORT + channel]; + dprintk (SX_DEBUG_CHAN, "port: %d %p flags: 0x%x\n",board_No(bp) * SX_NPORT + channel, port, port->flags & ASYNC_INITIALIZED); + + if (port->flags & ASYNC_INITIALIZED) { + dprintk (SX_DEBUG_CHAN, "port: %d %p\n", channel, port); + func_exit(); + return port; + } + } + printk(KERN_INFO "sx%d: %s interrupt from invalid port %d\n", + board_No(bp), what, channel); + return NULL; +} + + +static inline void sx_receive_exc(struct specialix_board * bp) +{ + struct specialix_port *port; + struct tty_struct *tty; + unsigned char status; + unsigned char ch; + + func_enter(); + + port = sx_get_port(bp, "Receive"); + if (!port) { + dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n"); + func_exit(); + return; + } + tty = port->tty; + dprintk (SX_DEBUG_RX, "port: %p count: %d BUFF_SIZE: %d\n", + port, tty->flip.count, TTY_FLIPBUF_SIZE); + + status = sx_in(bp, CD186x_RCSR); + + dprintk (SX_DEBUG_RX, "status: 0x%x\n", status); + if (status & RCSR_OE) { + port->overrun++; + dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Overrun. Total %ld overruns.\n", + board_No(bp), port_No(port), port->overrun); + } + status &= port->mark_mask; + + /* This flip buffer check needs to be below the reading of the + status register to reset the chip's IRQ.... */ + if (tty->flip.count >= TTY_FLIPBUF_SIZE) { + dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Working around flip buffer overflow.\n", + board_No(bp), port_No(port)); + func_exit(); + return; + } + + ch = sx_in(bp, CD186x_RDR); + if (!status) { + func_exit(); + return; + } + if (status & RCSR_TOUT) { + printk(KERN_INFO "sx%d: port %d: Receiver timeout. Hardware problems ?\n", + board_No(bp), port_No(port)); + func_exit(); + return; + + } else if (status & RCSR_BREAK) { + dprintk(SX_DEBUG_RX, "sx%d: port %d: Handling break...\n", + board_No(bp), port_No(port)); + *tty->flip.flag_buf_ptr++ = TTY_BREAK; + if (port->flags & ASYNC_SAK) + do_SAK(tty); + + } else if (status & RCSR_PE) + *tty->flip.flag_buf_ptr++ = TTY_PARITY; + + else if (status & RCSR_FE) + *tty->flip.flag_buf_ptr++ = TTY_FRAME; + + else if (status & RCSR_OE) + *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; + + else + *tty->flip.flag_buf_ptr++ = 0; + + *tty->flip.char_buf_ptr++ = ch; + tty->flip.count++; + schedule_delayed_work(&tty->flip.work, 1); + + func_exit(); +} + + +static inline void sx_receive(struct specialix_board * bp) +{ + struct specialix_port *port; + struct tty_struct *tty; + unsigned char count; + + func_enter(); + + if (!(port = sx_get_port(bp, "Receive"))) { + dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n"); + func_exit(); + return; + } + tty = port->tty; + + count = sx_in(bp, CD186x_RDCR); + dprintk (SX_DEBUG_RX, "port: %p: count: %d\n", port, count); + port->hits[count > 8 ? 9 : count]++; + + while (count--) { + if (tty->flip.count >= TTY_FLIPBUF_SIZE) { + printk(KERN_INFO "sx%d: port %d: Working around flip buffer overflow.\n", + board_No(bp), port_No(port)); + break; + } + *tty->flip.char_buf_ptr++ = sx_in(bp, CD186x_RDR); + *tty->flip.flag_buf_ptr++ = 0; + tty->flip.count++; + } + schedule_delayed_work(&tty->flip.work, 1); + + func_exit(); +} + + +static inline void sx_transmit(struct specialix_board * bp) +{ + struct specialix_port *port; + struct tty_struct *tty; + unsigned char count; + + func_enter(); + if (!(port = sx_get_port(bp, "Transmit"))) { + func_exit(); + return; + } + dprintk (SX_DEBUG_TX, "port: %p\n", port); + tty = port->tty; + + if (port->IER & IER_TXEMPTY) { + /* FIFO drained */ + sx_out(bp, CD186x_CAR, port_No(port)); + port->IER &= ~IER_TXEMPTY; + sx_out(bp, CD186x_IER, port->IER); + func_exit(); + return; + } + + if ((port->xmit_cnt <= 0 && !port->break_length) + || tty->stopped || tty->hw_stopped) { + sx_out(bp, CD186x_CAR, port_No(port)); + port->IER &= ~IER_TXRDY; + sx_out(bp, CD186x_IER, port->IER); + func_exit(); + return; + } + + if (port->break_length) { + if (port->break_length > 0) { + if (port->COR2 & COR2_ETC) { + sx_out(bp, CD186x_TDR, CD186x_C_ESC); + sx_out(bp, CD186x_TDR, CD186x_C_SBRK); + port->COR2 &= ~COR2_ETC; + } + count = min_t(int, port->break_length, 0xff); + sx_out(bp, CD186x_TDR, CD186x_C_ESC); + sx_out(bp, CD186x_TDR, CD186x_C_DELAY); + sx_out(bp, CD186x_TDR, count); + if (!(port->break_length -= count)) + port->break_length--; + } else { + sx_out(bp, CD186x_TDR, CD186x_C_ESC); + sx_out(bp, CD186x_TDR, CD186x_C_EBRK); + sx_out(bp, CD186x_COR2, port->COR2); + sx_wait_CCR(bp); + sx_out(bp, CD186x_CCR, CCR_CORCHG2); + port->break_length = 0; + } + + func_exit(); + return; + } + + count = CD186x_NFIFO; + do { + sx_out(bp, CD186x_TDR, port->xmit_buf[port->xmit_tail++]); + port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1); + if (--port->xmit_cnt <= 0) + break; + } while (--count > 0); + + if (port->xmit_cnt <= 0) { + sx_out(bp, CD186x_CAR, port_No(port)); + port->IER &= ~IER_TXRDY; + sx_out(bp, CD186x_IER, port->IER); + } + if (port->xmit_cnt <= port->wakeup_chars) + sx_mark_event(port, RS_EVENT_WRITE_WAKEUP); + + func_exit(); +} + + +static inline void sx_check_modem(struct specialix_board * bp) +{ + struct specialix_port *port; + struct tty_struct *tty; + unsigned char mcr; + int msvr_cd; + + dprintk (SX_DEBUG_SIGNALS, "Modem intr. "); + if (!(port = sx_get_port(bp, "Modem"))) + return; + + tty = port->tty; + + mcr = sx_in(bp, CD186x_MCR); + printk ("mcr = %02x.\n", mcr); + + if ((mcr & MCR_CDCHG)) { + dprintk (SX_DEBUG_SIGNALS, "CD just changed... "); + msvr_cd = sx_in(bp, CD186x_MSVR) & MSVR_CD; + if (msvr_cd) { + dprintk (SX_DEBUG_SIGNALS, "Waking up guys in open.\n"); + wake_up_interruptible(&port->open_wait); + } else { + dprintk (SX_DEBUG_SIGNALS, "Sending HUP.\n"); + schedule_work(&port->tqueue_hangup); + } + } + +#ifdef SPECIALIX_BRAIN_DAMAGED_CTS + if (mcr & MCR_CTSCHG) { + if (sx_in(bp, CD186x_MSVR) & MSVR_CTS) { + tty->hw_stopped = 0; + port->IER |= IER_TXRDY; + if (port->xmit_cnt <= port->wakeup_chars) + sx_mark_event(port, RS_EVENT_WRITE_WAKEUP); + } else { + tty->hw_stopped = 1; + port->IER &= ~IER_TXRDY; + } + sx_out(bp, CD186x_IER, port->IER); + } + if (mcr & MCR_DSSXHG) { + if (sx_in(bp, CD186x_MSVR) & MSVR_DSR) { + tty->hw_stopped = 0; + port->IER |= IER_TXRDY; + if (port->xmit_cnt <= port->wakeup_chars) + sx_mark_event(port, RS_EVENT_WRITE_WAKEUP); + } else { + tty->hw_stopped = 1; + port->IER &= ~IER_TXRDY; + } + sx_out(bp, CD186x_IER, port->IER); + } +#endif /* SPECIALIX_BRAIN_DAMAGED_CTS */ + + /* Clear change bits */ + sx_out(bp, CD186x_MCR, 0); +} + + +/* The main interrupt processing routine */ +static irqreturn_t sx_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + unsigned char status; + unsigned char ack; + struct specialix_board *bp; + unsigned long loop = 0; + int saved_reg; + unsigned long flags; + + func_enter(); + + bp = dev_id; + spin_lock_irqsave(&bp->lock, flags); + + dprintk (SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __FUNCTION__, port_No(sx_get_port(bp, "INT")), SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1); + if (!bp || !(bp->flags & SX_BOARD_ACTIVE)) { + dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", irq); + spin_unlock_irqrestore(&bp->lock, flags); + func_exit(); + return IRQ_NONE; + } + + saved_reg = bp->reg; + + while ((++loop < 16) && (status = (sx_in(bp, CD186x_SRSR) & + (SRSR_RREQint | + SRSR_TREQint | + SRSR_MREQint)))) { + if (status & SRSR_RREQint) { + ack = sx_in(bp, CD186x_RRAR); + + if (ack == (SX_ID | GIVR_IT_RCV)) + sx_receive(bp); + else if (ack == (SX_ID | GIVR_IT_REXC)) + sx_receive_exc(bp); + else + printk(KERN_ERR "sx%d: status: 0x%x Bad receive ack 0x%02x.\n", + board_No(bp), status, ack); + + } else if (status & SRSR_TREQint) { + ack = sx_in(bp, CD186x_TRAR); + + if (ack == (SX_ID | GIVR_IT_TX)) + sx_transmit(bp); + else + printk(KERN_ERR "sx%d: status: 0x%x Bad transmit ack 0x%02x. port: %d\n", + board_No(bp), status, ack, port_No (sx_get_port (bp, "Int"))); + } else if (status & SRSR_MREQint) { + ack = sx_in(bp, CD186x_MRAR); + + if (ack == (SX_ID | GIVR_IT_MODEM)) + sx_check_modem(bp); + else + printk(KERN_ERR "sx%d: status: 0x%x Bad modem ack 0x%02x.\n", + board_No(bp), status, ack); + + } + + sx_out(bp, CD186x_EOIR, 0); /* Mark end of interrupt */ + } + bp->reg = saved_reg; + outb (bp->reg, bp->base + SX_ADDR_REG); + spin_unlock_irqrestore(&bp->lock, flags); + func_exit(); + return IRQ_HANDLED; +} + + +/* + * Routines for open & close processing. + */ + +static void turn_ints_off (struct specialix_board *bp) +{ + unsigned long flags; + + func_enter(); + if (bp->flags & SX_BOARD_IS_PCI) { + /* This was intended for enabeling the interrupt on the + * PCI card. However it seems that it's already enabled + * and as PCI interrupts can be shared, there is no real + * reason to have to turn it off. */ + } + + spin_lock_irqsave(&bp->lock, flags); + (void) sx_in_off (bp, 0); /* Turn off interrupts. */ + spin_unlock_irqrestore(&bp->lock, flags); + + func_exit(); +} + +static void turn_ints_on (struct specialix_board *bp) +{ + unsigned long flags; + + func_enter(); + + if (bp->flags & SX_BOARD_IS_PCI) { + /* play with the PCI chip. See comment above. */ + } + spin_lock_irqsave(&bp->lock, flags); + (void) sx_in (bp, 0); /* Turn ON interrupts. */ + spin_unlock_irqrestore(&bp->lock, flags); + + func_exit(); +} + + +/* Called with disabled interrupts */ +static inline int sx_setup_board(struct specialix_board * bp) +{ + int error; + + if (bp->flags & SX_BOARD_ACTIVE) + return 0; + + if (bp->flags & SX_BOARD_IS_PCI) + error = request_irq(bp->irq, sx_interrupt, SA_INTERRUPT | SA_SHIRQ, "specialix IO8+", bp); + else + error = request_irq(bp->irq, sx_interrupt, SA_INTERRUPT, "specialix IO8+", bp); + + if (error) + return error; + + turn_ints_on (bp); + bp->flags |= SX_BOARD_ACTIVE; + + return 0; +} + + +/* Called with disabled interrupts */ +static inline void sx_shutdown_board(struct specialix_board *bp) +{ + func_enter(); + + if (!(bp->flags & SX_BOARD_ACTIVE)) { + func_exit(); + return; + } + + bp->flags &= ~SX_BOARD_ACTIVE; + + dprintk (SX_DEBUG_IRQ, "Freeing IRQ%d for board %d.\n", + bp->irq, board_No (bp)); + free_irq(bp->irq, bp); + + turn_ints_off (bp); + + + func_exit(); +} + + +/* + * Setting up port characteristics. + * Must be called with disabled interrupts + */ +static void sx_change_speed(struct specialix_board *bp, struct specialix_port *port) +{ + struct tty_struct *tty; + unsigned long baud; + long tmp; + unsigned char cor1 = 0, cor3 = 0; + unsigned char mcor1 = 0, mcor2 = 0; + static unsigned long again; + unsigned long flags; + + func_enter(); + + if (!(tty = port->tty) || !tty->termios) { + func_exit(); + return; + } + + port->IER = 0; + port->COR2 = 0; + /* Select port on the board */ + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + + /* The Specialix board doens't implement the RTS lines. + They are used to set the IRQ level. Don't touch them. */ + if (SX_CRTSCTS(tty)) + port->MSVR = MSVR_DTR | (sx_in(bp, CD186x_MSVR) & MSVR_RTS); + else + port->MSVR = (sx_in(bp, CD186x_MSVR) & MSVR_RTS); + spin_unlock_irqrestore(&bp->lock, flags); + dprintk (SX_DEBUG_TERMIOS, "sx: got MSVR=%02x.\n", port->MSVR); + baud = C_BAUD(tty); + + if (baud & CBAUDEX) { + baud &= ~CBAUDEX; + if (baud < 1 || baud > 2) + port->tty->termios->c_cflag &= ~CBAUDEX; + else + baud += 15; + } + if (baud == 15) { + if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) + baud ++; + if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) + baud += 2; + } + + + if (!baud_table[baud]) { + /* Drop DTR & exit */ + dprintk (SX_DEBUG_TERMIOS, "Dropping DTR... Hmm....\n"); + if (!SX_CRTSCTS (tty)) { + port -> MSVR &= ~ MSVR_DTR; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_MSVR, port->MSVR ); + spin_unlock_irqrestore(&bp->lock, flags); + } + else + dprintk (SX_DEBUG_TERMIOS, "Can't drop DTR: no DTR.\n"); + return; + } else { + /* Set DTR on */ + if (!SX_CRTSCTS (tty)) { + port ->MSVR |= MSVR_DTR; + } + } + + /* + * Now we must calculate some speed depended things + */ + + /* Set baud rate for port */ + tmp = port->custom_divisor ; + if ( tmp ) + printk (KERN_INFO "sx%d: Using custom baud rate divisor %ld. \n" + "This is an untested option, please be carefull.\n", + port_No (port), tmp); + else + tmp = (((SX_OSCFREQ + baud_table[baud]/2) / baud_table[baud] + + CD186x_TPC/2) / CD186x_TPC); + + if ((tmp < 0x10) && time_before(again, jiffies)) { + again = jiffies + HZ * 60; + /* Page 48 of version 2.0 of the CL-CD1865 databook */ + if (tmp >= 12) { + printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n" + "Performance degradation is possible.\n" + "Read specialix.txt for more info.\n", + port_No (port), tmp); + } else { + printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n" + "Warning: overstressing Cirrus chip. " + "This might not work.\n" + "Read specialix.txt for more info.\n", + port_No (port), tmp); + } + } + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_RBPRH, (tmp >> 8) & 0xff); + sx_out(bp, CD186x_TBPRH, (tmp >> 8) & 0xff); + sx_out(bp, CD186x_RBPRL, tmp & 0xff); + sx_out(bp, CD186x_TBPRL, tmp & 0xff); + spin_unlock_irqrestore(&bp->lock, flags); + if (port->custom_divisor) { + baud = (SX_OSCFREQ + port->custom_divisor/2) / port->custom_divisor; + baud = ( baud + 5 ) / 10; + } else + baud = (baud_table[baud] + 5) / 10; /* Estimated CPS */ + + /* Two timer ticks seems enough to wakeup something like SLIP driver */ + tmp = ((baud + HZ/2) / HZ) * 2 - CD186x_NFIFO; + port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ? + SERIAL_XMIT_SIZE - 1 : tmp); + + /* Receiver timeout will be transmission time for 1.5 chars */ + tmp = (SPECIALIX_TPS + SPECIALIX_TPS/2 + baud/2) / baud; + tmp = (tmp > 0xff) ? 0xff : tmp; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_RTPR, tmp); + spin_unlock_irqrestore(&bp->lock, flags); + switch (C_CSIZE(tty)) { + case CS5: + cor1 |= COR1_5BITS; + break; + case CS6: + cor1 |= COR1_6BITS; + break; + case CS7: + cor1 |= COR1_7BITS; + break; + case CS8: + cor1 |= COR1_8BITS; + break; + } + + if (C_CSTOPB(tty)) + cor1 |= COR1_2SB; + + cor1 |= COR1_IGNORE; + if (C_PARENB(tty)) { + cor1 |= COR1_NORMPAR; + if (C_PARODD(tty)) + cor1 |= COR1_ODDP; + if (I_INPCK(tty)) + cor1 &= ~COR1_IGNORE; + } + /* Set marking of some errors */ + port->mark_mask = RCSR_OE | RCSR_TOUT; + if (I_INPCK(tty)) + port->mark_mask |= RCSR_FE | RCSR_PE; + if (I_BRKINT(tty) || I_PARMRK(tty)) + port->mark_mask |= RCSR_BREAK; + if (I_IGNPAR(tty)) + port->mark_mask &= ~(RCSR_FE | RCSR_PE); + if (I_IGNBRK(tty)) { + port->mark_mask &= ~RCSR_BREAK; + if (I_IGNPAR(tty)) + /* Real raw mode. Ignore all */ + port->mark_mask &= ~RCSR_OE; + } + /* Enable Hardware Flow Control */ + if (C_CRTSCTS(tty)) { +#ifdef SPECIALIX_BRAIN_DAMAGED_CTS + port->IER |= IER_DSR | IER_CTS; + mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD; + mcor2 |= MCOR2_DSROD | MCOR2_CTSOD; + spin_lock_irqsave(&bp->lock, flags); + tty->hw_stopped = !(sx_in(bp, CD186x_MSVR) & (MSVR_CTS|MSVR_DSR)); + spin_unlock_irqrestore(&bp->lock, flags); +#else + port->COR2 |= COR2_CTSAE; +#endif + } + /* Enable Software Flow Control. FIXME: I'm not sure about this */ + /* Some people reported that it works, but I still doubt it */ + if (I_IXON(tty)) { + port->COR2 |= COR2_TXIBE; + cor3 |= (COR3_FCT | COR3_SCDE); + if (I_IXANY(tty)) + port->COR2 |= COR2_IXM; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_SCHR1, START_CHAR(tty)); + sx_out(bp, CD186x_SCHR2, STOP_CHAR(tty)); + sx_out(bp, CD186x_SCHR3, START_CHAR(tty)); + sx_out(bp, CD186x_SCHR4, STOP_CHAR(tty)); + spin_unlock_irqrestore(&bp->lock, flags); + } + if (!C_CLOCAL(tty)) { + /* Enable CD check */ + port->IER |= IER_CD; + mcor1 |= MCOR1_CDZD; + mcor2 |= MCOR2_CDOD; + } + + if (C_CREAD(tty)) + /* Enable receiver */ + port->IER |= IER_RXD; + + /* Set input FIFO size (1-8 bytes) */ + cor3 |= sx_rxfifo; + /* Setting up CD186x channel registers */ + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_COR1, cor1); + sx_out(bp, CD186x_COR2, port->COR2); + sx_out(bp, CD186x_COR3, cor3); + spin_unlock_irqrestore(&bp->lock, flags); + /* Make CD186x know about registers change */ + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3); + /* Setting up modem option registers */ + dprintk (SX_DEBUG_TERMIOS, "Mcor1 = %02x, mcor2 = %02x.\n", mcor1, mcor2); + sx_out(bp, CD186x_MCOR1, mcor1); + sx_out(bp, CD186x_MCOR2, mcor2); + spin_unlock_irqrestore(&bp->lock, flags); + /* Enable CD186x transmitter & receiver */ + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_TXEN | CCR_RXEN); + /* Enable interrupts */ + sx_out(bp, CD186x_IER, port->IER); + /* And finally set the modem lines... */ + sx_out(bp, CD186x_MSVR, port->MSVR); + spin_unlock_irqrestore(&bp->lock, flags); + + func_exit(); +} + + +/* Must be called with interrupts enabled */ +static int sx_setup_port(struct specialix_board *bp, struct specialix_port *port) +{ + unsigned long flags; + + func_enter(); + + if (port->flags & ASYNC_INITIALIZED) { + func_exit(); + return 0; + } + + if (!port->xmit_buf) { + /* We may sleep in get_zeroed_page() */ + unsigned long tmp; + + if (!(tmp = get_zeroed_page(GFP_KERNEL))) { + func_exit(); + return -ENOMEM; + } + + if (port->xmit_buf) { + free_page(tmp); + func_exit(); + return -ERESTARTSYS; + } + port->xmit_buf = (unsigned char *) tmp; + } + + spin_lock_irqsave(&port->lock, flags); + + if (port->tty) + clear_bit(TTY_IO_ERROR, &port->tty->flags); + + port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; + sx_change_speed(bp, port); + port->flags |= ASYNC_INITIALIZED; + + spin_unlock_irqrestore(&port->lock, flags); + + + func_exit(); + return 0; +} + + +/* Must be called with interrupts disabled */ +static void sx_shutdown_port(struct specialix_board *bp, struct specialix_port *port) +{ + struct tty_struct *tty; + int i; + unsigned long flags; + + func_enter(); + + if (!(port->flags & ASYNC_INITIALIZED)) { + func_exit(); + return; + } + + if (sx_debug & SX_DEBUG_FIFO) { + dprintk(SX_DEBUG_FIFO, "sx%d: port %d: %ld overruns, FIFO hits [ ", + board_No(bp), port_No(port), port->overrun); + for (i = 0; i < 10; i++) { + dprintk(SX_DEBUG_FIFO, "%ld ", port->hits[i]); + } + dprintk(SX_DEBUG_FIFO, "].\n"); + } + + if (port->xmit_buf) { + free_page((unsigned long) port->xmit_buf); + port->xmit_buf = NULL; + } + + /* Select port */ + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + + if (!(tty = port->tty) || C_HUPCL(tty)) { + /* Drop DTR */ + sx_out(bp, CD186x_MSVDTR, 0); + } + spin_unlock_irqrestore(&bp->lock, flags); + /* Reset port */ + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_SOFTRESET); + /* Disable all interrupts from this port */ + port->IER = 0; + sx_out(bp, CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + if (tty) + set_bit(TTY_IO_ERROR, &tty->flags); + port->flags &= ~ASYNC_INITIALIZED; + + if (!bp->count) + sx_shutdown_board(bp); + func_exit(); +} + + +static int block_til_ready(struct tty_struct *tty, struct file * filp, + struct specialix_port *port) +{ + DECLARE_WAITQUEUE(wait, current); + struct specialix_board *bp = port_Board(port); + int retval; + int do_clocal = 0; + int CD; + unsigned long flags; + + func_enter(); + + /* + * 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) || port->flags & ASYNC_CLOSING) { + interruptible_sleep_on(&port->close_wait); + if (port->flags & ASYNC_HUP_NOTIFY) { + func_exit(); + return -EAGAIN; + } else { + func_exit(); + return -ERESTARTSYS; + } + } + + /* + * 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))) { + port->flags |= ASYNC_NORMAL_ACTIVE; + func_exit(); + return 0; + } + + if (C_CLOCAL(tty)) + do_clocal = 1; + + /* + * Block waiting for the carrier detect and the line to become + * free (i.e., not in use by the callout). While we are in + * this loop, info->count is dropped by one, so that + * rs_close() knows when to free things. We restore it upon + * exit, either normal or abnormal. + */ + retval = 0; + add_wait_queue(&port->open_wait, &wait); + spin_lock_irqsave(&port->lock, flags); + if (!tty_hung_up_p(filp)) { + port->count--; + } + spin_unlock_irqrestore(&port->lock, flags); + port->blocked_open++; + while (1) { + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + CD = sx_in(bp, CD186x_MSVR) & MSVR_CD; + if (SX_CRTSCTS (tty)) { + /* Activate RTS */ + port->MSVR |= MSVR_DTR; /* WTF? */ + sx_out (bp, CD186x_MSVR, port->MSVR); + } else { + /* Activate DTR */ + port->MSVR |= MSVR_DTR; + sx_out (bp, CD186x_MSVR, port->MSVR); + } + spin_unlock_irqrestore(&bp->lock, flags); + set_current_state(TASK_INTERRUPTIBLE); + if (tty_hung_up_p(filp) || + !(port->flags & ASYNC_INITIALIZED)) { + if (port->flags & ASYNC_HUP_NOTIFY) + retval = -EAGAIN; + else + retval = -ERESTARTSYS; + break; + } + if (!(port->flags & ASYNC_CLOSING) && + (do_clocal || CD)) + break; + if (signal_pending(current)) { + retval = -ERESTARTSYS; + break; + } + schedule(); + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(&port->open_wait, &wait); + spin_lock_irqsave(&port->lock, flags); + if (!tty_hung_up_p(filp)) { + port->count++; + } + port->blocked_open--; + spin_unlock_irqrestore(&port->lock, flags); + if (retval) { + func_exit(); + return retval; + } + + port->flags |= ASYNC_NORMAL_ACTIVE; + func_exit(); + return 0; +} + + +static int sx_open(struct tty_struct * tty, struct file * filp) +{ + int board; + int error; + struct specialix_port * port; + struct specialix_board * bp; + int i; + unsigned long flags; + + func_enter(); + + board = SX_BOARD(tty->index); + + if (board >= SX_NBOARD || !(sx_board[board].flags & SX_BOARD_PRESENT)) { + func_exit(); + return -ENODEV; + } + + bp = &sx_board[board]; + port = sx_port + board * SX_NPORT + SX_PORT(tty->index); + port->overrun = 0; + for (i = 0; i < 10; i++) + port->hits[i]=0; + + dprintk (SX_DEBUG_OPEN, "Board = %d, bp = %p, port = %p, portno = %d.\n", + board, bp, port, SX_PORT(tty->index)); + + if (sx_paranoia_check(port, tty->name, "sx_open")) { + func_enter(); + return -ENODEV; + } + + if ((error = sx_setup_board(bp))) { + func_exit(); + return error; + } + + spin_lock_irqsave(&bp->lock, flags); + port->count++; + bp->count++; + tty->driver_data = port; + port->tty = tty; + spin_unlock_irqrestore(&bp->lock, flags); + + if ((error = sx_setup_port(bp, port))) { + func_enter(); + return error; + } + + if ((error = block_til_ready(tty, filp, port))) { + func_enter(); + return error; + } + + func_exit(); + return 0; +} + + +static void sx_close(struct tty_struct * tty, struct file * filp) +{ + struct specialix_port *port = (struct specialix_port *) tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + unsigned long timeout; + + func_enter(); + if (!port || sx_paranoia_check(port, tty->name, "close")) { + func_exit(); + return; + } + spin_lock_irqsave(&port->lock, flags); + + if (tty_hung_up_p(filp)) { + spin_unlock_irqrestore(&port->lock, flags); + func_exit(); + return; + } + + bp = port_Board(port); + if ((tty->count == 1) && (port->count != 1)) { + printk(KERN_ERR "sx%d: sx_close: bad port count;" + " tty->count is 1, port count is %d\n", + board_No(bp), port->count); + port->count = 1; + } + + if (port->count > 1) { + port->count--; + bp->count--; + + spin_unlock_irqrestore(&port->lock, flags); + + func_exit(); + return; + } + port->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; + spin_unlock_irqrestore(&port->lock, flags); + dprintk (SX_DEBUG_OPEN, "Closing\n"); + if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) { + tty_wait_until_sent(tty, port->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. + */ + dprintk (SX_DEBUG_OPEN, "Closed\n"); + port->IER &= ~IER_RXD; + if (port->flags & ASYNC_INITIALIZED) { + port->IER &= ~IER_TXRDY; + port->IER |= IER_TXEMPTY; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + /* + * Before we drop DTR, make sure the UART transmitter + * has completely drained; this is especially + * important if there is a transmit FIFO! + */ + timeout = jiffies+HZ; + while(port->IER & IER_TXEMPTY) { + set_current_state (TASK_INTERRUPTIBLE); + msleep_interruptible(jiffies_to_msecs(port->timeout)); + if (time_after(jiffies, timeout)) { + printk (KERN_INFO "Timeout waiting for close\n"); + break; + } + } + + } + + if (--bp->count < 0) { + printk(KERN_ERR "sx%d: sx_shutdown_port: bad board count: %d port: %d\n", + board_No(bp), bp->count, tty->index); + bp->count = 0; + } + if (--port->count < 0) { + printk(KERN_ERR "sx%d: sx_close: bad port count for tty%d: %d\n", + board_No(bp), port_No(port), port->count); + port->count = 0; + } + + sx_shutdown_port(bp, port); + if (tty->driver->flush_buffer) + tty->driver->flush_buffer(tty); + tty_ldisc_flush(tty); + spin_lock_irqsave(&port->lock, flags); + tty->closing = 0; + port->event = 0; + port->tty = NULL; + spin_unlock_irqrestore(&port->lock, flags); + if (port->blocked_open) { + if (port->close_delay) { + msleep_interruptible(jiffies_to_msecs(port->close_delay)); + } + wake_up_interruptible(&port->open_wait); + } + port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); + wake_up_interruptible(&port->close_wait); + + func_exit(); +} + + +static int sx_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + int c, total = 0; + unsigned long flags; + + func_enter(); + if (sx_paranoia_check(port, tty->name, "sx_write")) { + func_exit(); + return 0; + } + + bp = port_Board(port); + + if (!tty || !port->xmit_buf || !tmp_buf) { + func_exit(); + return 0; + } + + while (1) { + spin_lock_irqsave(&port->lock, flags); + c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1, + SERIAL_XMIT_SIZE - port->xmit_head)); + if (c <= 0) { + spin_unlock_irqrestore(&port->lock, flags); + break; + } + memcpy(port->xmit_buf + port->xmit_head, buf, c); + port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1); + port->xmit_cnt += c; + spin_unlock_irqrestore(&port->lock, flags); + + buf += c; + count -= c; + total += c; + } + + spin_lock_irqsave(&bp->lock, flags); + if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped && + !(port->IER & IER_TXRDY)) { + port->IER |= IER_TXRDY; + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_IER, port->IER); + } + spin_unlock_irqrestore(&bp->lock, flags); + func_exit(); + + return total; +} + + +static void sx_put_char(struct tty_struct * tty, unsigned char ch) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + unsigned long flags; + struct specialix_board * bp; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_put_char")) { + func_exit(); + return; + } + dprintk (SX_DEBUG_TX, "check tty: %p %p\n", tty, port->xmit_buf); + if (!tty || !port->xmit_buf) { + func_exit(); + return; + } + bp = port_Board(port); + spin_lock_irqsave(&port->lock, flags); + + dprintk (SX_DEBUG_TX, "xmit_cnt: %d xmit_buf: %p\n", port->xmit_cnt, port->xmit_buf); + if ((port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) || (!port->xmit_buf)) { + spin_unlock_irqrestore(&port->lock, flags); + dprintk (SX_DEBUG_TX, "Exit size\n"); + func_exit(); + return; + } + dprintk (SX_DEBUG_TX, "Handle xmit: %p %p\n", port, port->xmit_buf); + port->xmit_buf[port->xmit_head++] = ch; + port->xmit_head &= SERIAL_XMIT_SIZE - 1; + port->xmit_cnt++; + spin_unlock_irqrestore(&port->lock, flags); + + func_exit(); +} + + +static void sx_flush_chars(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + unsigned long flags; + struct specialix_board * bp = port_Board(port); + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_flush_chars")) { + func_exit(); + return; + } + if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || + !port->xmit_buf) { + func_exit(); + return; + } + spin_lock_irqsave(&bp->lock, flags); + port->IER |= IER_TXRDY; + sx_out(port_Board(port), CD186x_CAR, port_No(port)); + sx_out(port_Board(port), CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + + func_exit(); +} + + +static int sx_write_room(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + int ret; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_write_room")) { + func_exit(); + return 0; + } + + ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; + if (ret < 0) + ret = 0; + + func_exit(); + return ret; +} + + +static int sx_chars_in_buffer(struct tty_struct *tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_chars_in_buffer")) { + func_exit(); + return 0; + } + func_exit(); + return port->xmit_cnt; +} + + +static void sx_flush_buffer(struct tty_struct *tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + unsigned long flags; + struct specialix_board * bp; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_flush_buffer")) { + func_exit(); + return; + } + + bp = port_Board(port); + spin_lock_irqsave(&port->lock, flags); + port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; + spin_unlock_irqrestore(&port->lock, flags); + tty_wakeup(tty); + + func_exit(); +} + + +static int sx_tiocmget(struct tty_struct *tty, struct file *file) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board * bp; + unsigned char status; + unsigned int result; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, __FUNCTION__)) { + func_exit(); + return -ENODEV; + } + + bp = port_Board(port); + spin_lock_irqsave (&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + status = sx_in(bp, CD186x_MSVR); + spin_unlock_irqrestore(&bp->lock, flags); + dprintk (SX_DEBUG_INIT, "Got msvr[%d] = %02x, car = %d.\n", + port_No(port), status, sx_in (bp, CD186x_CAR)); + dprintk (SX_DEBUG_INIT, "sx_port = %p, port = %p\n", sx_port, port); + if (SX_CRTSCTS(port->tty)) { + result = /* (status & MSVR_RTS) ? */ TIOCM_DTR /* : 0) */ + | ((status & MSVR_DTR) ? TIOCM_RTS : 0) + | ((status & MSVR_CD) ? TIOCM_CAR : 0) + |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */ + | ((status & MSVR_CTS) ? TIOCM_CTS : 0); + } else { + result = /* (status & MSVR_RTS) ? */ TIOCM_RTS /* : 0) */ + | ((status & MSVR_DTR) ? TIOCM_DTR : 0) + | ((status & MSVR_CD) ? TIOCM_CAR : 0) + |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */ + | ((status & MSVR_CTS) ? TIOCM_CTS : 0); + } + + func_exit(); + + return result; +} + + +static int sx_tiocmset(struct tty_struct *tty, struct file *file, + unsigned int set, unsigned int clear) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + unsigned long flags; + struct specialix_board *bp; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, __FUNCTION__)) { + func_exit(); + return -ENODEV; + } + + bp = port_Board(port); + + spin_lock_irqsave(&port->lock, flags); + /* if (set & TIOCM_RTS) + port->MSVR |= MSVR_RTS; */ + /* if (set & TIOCM_DTR) + port->MSVR |= MSVR_DTR; */ + + if (SX_CRTSCTS(port->tty)) { + if (set & TIOCM_RTS) + port->MSVR |= MSVR_DTR; + } else { + if (set & TIOCM_DTR) + port->MSVR |= MSVR_DTR; + } + + /* if (clear & TIOCM_RTS) + port->MSVR &= ~MSVR_RTS; */ + /* if (clear & TIOCM_DTR) + port->MSVR &= ~MSVR_DTR; */ + if (SX_CRTSCTS(port->tty)) { + if (clear & TIOCM_RTS) + port->MSVR &= ~MSVR_DTR; + } else { + if (clear & TIOCM_DTR) + port->MSVR &= ~MSVR_DTR; + } + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_MSVR, port->MSVR); + spin_unlock_irqrestore(&bp->lock, flags); + spin_unlock_irqrestore(&port->lock, flags); + func_exit(); + return 0; +} + + +static inline void sx_send_break(struct specialix_port * port, unsigned long length) +{ + struct specialix_board *bp = port_Board(port); + unsigned long flags; + + func_enter(); + + spin_lock_irqsave (&port->lock, flags); + port->break_length = SPECIALIX_TPS / HZ * length; + port->COR2 |= COR2_ETC; + port->IER |= IER_TXRDY; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_COR2, port->COR2); + sx_out(bp, CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + spin_unlock_irqrestore (&port->lock, flags); + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_CORCHG2); + spin_unlock_irqrestore(&bp->lock, flags); + sx_wait_CCR(bp); + + func_exit(); +} + + +static inline int sx_set_serial_info(struct specialix_port * port, + struct serial_struct __user * newinfo) +{ + struct serial_struct tmp; + struct specialix_board *bp = port_Board(port); + int change_speed; + + func_enter(); + /* + error = verify_area(VERIFY_READ, (void *) newinfo, sizeof(tmp)); + if (error) { + func_exit(); + return error; + } + */ + if (copy_from_user(&tmp, newinfo, sizeof(tmp))) { + func_enter(); + return -EFAULT; + } + +#if 0 + if ((tmp.irq != bp->irq) || + (tmp.port != bp->base) || + (tmp.type != PORT_CIRRUS) || + (tmp.baud_base != (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC) || + (tmp.custom_divisor != 0) || + (tmp.xmit_fifo_size != CD186x_NFIFO) || + (tmp.flags & ~SPECIALIX_LEGAL_FLAGS)) { + func_exit(); + return -EINVAL; + } +#endif + + change_speed = ((port->flags & ASYNC_SPD_MASK) != + (tmp.flags & ASYNC_SPD_MASK)); + change_speed |= (tmp.custom_divisor != port->custom_divisor); + + if (!capable(CAP_SYS_ADMIN)) { + if ((tmp.close_delay != port->close_delay) || + (tmp.closing_wait != port->closing_wait) || + ((tmp.flags & ~ASYNC_USR_MASK) != + (port->flags & ~ASYNC_USR_MASK))) { + func_exit(); + return -EPERM; + } + port->flags = ((port->flags & ~ASYNC_USR_MASK) | + (tmp.flags & ASYNC_USR_MASK)); + port->custom_divisor = tmp.custom_divisor; + } else { + port->flags = ((port->flags & ~ASYNC_FLAGS) | + (tmp.flags & ASYNC_FLAGS)); + port->close_delay = tmp.close_delay; + port->closing_wait = tmp.closing_wait; + port->custom_divisor = tmp.custom_divisor; + } + if (change_speed) { + sx_change_speed(bp, port); + } + func_exit(); + return 0; +} + + +static inline int sx_get_serial_info(struct specialix_port * port, + struct serial_struct __user *retinfo) +{ + struct serial_struct tmp; + struct specialix_board *bp = port_Board(port); + // int error; + + func_enter(); + + /* + error = verify_area(VERIFY_WRITE, (void *) retinfo, sizeof(tmp)); + if (error) + return error; + */ + + memset(&tmp, 0, sizeof(tmp)); + tmp.type = PORT_CIRRUS; + tmp.line = port - sx_port; + tmp.port = bp->base; + tmp.irq = bp->irq; + tmp.flags = port->flags; + tmp.baud_base = (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC; + tmp.close_delay = port->close_delay * HZ/100; + tmp.closing_wait = port->closing_wait * HZ/100; + tmp.custom_divisor = port->custom_divisor; + tmp.xmit_fifo_size = CD186x_NFIFO; + if (copy_to_user(retinfo, &tmp, sizeof(tmp))) { + func_exit(); + return -EFAULT; + } + + func_exit(); + return 0; +} + + +static int sx_ioctl(struct tty_struct * tty, struct file * filp, + unsigned int cmd, unsigned long arg) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + int retval; + void __user *argp = (void __user *)arg; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_ioctl")) { + func_exit(); + return -ENODEV; + } + + switch (cmd) { + case TCSBRK: /* SVID version: non-zero arg --> no break */ + retval = tty_check_change(tty); + if (retval) { + func_exit(); + return retval; + } + tty_wait_until_sent(tty, 0); + if (!arg) + sx_send_break(port, HZ/4); /* 1/4 second */ + return 0; + case TCSBRKP: /* support for POSIX tcsendbreak() */ + retval = tty_check_change(tty); + if (retval) { + func_exit(); + return retval; + } + tty_wait_until_sent(tty, 0); + sx_send_break(port, arg ? arg*(HZ/10) : HZ/4); + func_exit(); + return 0; + case TIOCGSOFTCAR: + if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)argp)) { + func_exit(); + return -EFAULT; + } + func_exit(); + return 0; + case TIOCSSOFTCAR: + if (get_user(arg, (unsigned long __user *) argp)) { + func_exit(); + return -EFAULT; + } + tty->termios->c_cflag = + ((tty->termios->c_cflag & ~CLOCAL) | + (arg ? CLOCAL : 0)); + func_exit(); + return 0; + case TIOCGSERIAL: + func_exit(); + return sx_get_serial_info(port, argp); + case TIOCSSERIAL: + func_exit(); + return sx_set_serial_info(port, argp); + default: + func_exit(); + return -ENOIOCTLCMD; + } + func_exit(); + return 0; +} + + +static void sx_throttle(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_throttle")) { + func_exit(); + return; + } + + bp = port_Board(port); + + /* Use DTR instead of RTS ! */ + if (SX_CRTSCTS (tty)) + port->MSVR &= ~MSVR_DTR; + else { + /* Auch!!! I think the system shouldn't call this then. */ + /* Or maybe we're supposed (allowed?) to do our side of hw + handshake anyway, even when hardware handshake is off. + When you see this in your logs, please report.... */ + printk (KERN_ERR "sx%d: Need to throttle, but can't (hardware hs is off)\n", + port_No (port)); + } + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + spin_unlock_irqrestore(&bp->lock, flags); + if (I_IXOFF(tty)) { + spin_unlock_irqrestore(&bp->lock, flags); + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_SSCH2); + spin_unlock_irqrestore(&bp->lock, flags); + sx_wait_CCR(bp); + } + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_MSVR, port->MSVR); + spin_unlock_irqrestore(&bp->lock, flags); + + func_exit(); +} + + +static void sx_unthrottle(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_unthrottle")) { + func_exit(); + return; + } + + bp = port_Board(port); + + spin_lock_irqsave(&port->lock, flags); + /* XXXX Use DTR INSTEAD???? */ + if (SX_CRTSCTS(tty)) { + port->MSVR |= MSVR_DTR; + } /* Else clause: see remark in "sx_throttle"... */ + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + spin_unlock_irqrestore(&bp->lock, flags); + if (I_IXOFF(tty)) { + spin_unlock_irqrestore(&port->lock, flags); + sx_wait_CCR(bp); + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CCR, CCR_SSCH1); + spin_unlock_irqrestore(&bp->lock, flags); + sx_wait_CCR(bp); + spin_lock_irqsave(&port->lock, flags); + } + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_MSVR, port->MSVR); + spin_unlock_irqrestore(&bp->lock, flags); + spin_unlock_irqrestore(&port->lock, flags); + + func_exit(); +} + + +static void sx_stop(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_stop")) { + func_exit(); + return; + } + + bp = port_Board(port); + + spin_lock_irqsave(&port->lock, flags); + port->IER &= ~IER_TXRDY; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + spin_unlock_irqrestore(&port->lock, flags); + + func_exit(); +} + + +static void sx_start(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_start")) { + func_exit(); + return; + } + + bp = port_Board(port); + + spin_lock_irqsave(&port->lock, flags); + if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) { + port->IER |= IER_TXRDY; + spin_lock_irqsave(&bp->lock, flags); + sx_out(bp, CD186x_CAR, port_No(port)); + sx_out(bp, CD186x_IER, port->IER); + spin_unlock_irqrestore(&bp->lock, flags); + } + spin_unlock_irqrestore(&port->lock, flags); + + func_exit(); +} + + +/* + * This routine is called from the work-queue when the interrupt + * routine has signalled that a hangup has occurred. The path of + * hangup processing is: + * + * serial interrupt routine -> (workqueue) -> + * do_sx_hangup() -> tty->hangup() -> sx_hangup() + * + */ +static void do_sx_hangup(void *private_) +{ + struct specialix_port *port = (struct specialix_port *) private_; + struct tty_struct *tty; + + func_enter(); + + tty = port->tty; + if (tty) + tty_hangup(tty); /* FIXME: module removal race here */ + + func_exit(); +} + + +static void sx_hangup(struct tty_struct * tty) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + struct specialix_board *bp; + unsigned long flags; + + func_enter(); + + if (sx_paranoia_check(port, tty->name, "sx_hangup")) { + func_exit(); + return; + } + + bp = port_Board(port); + + sx_shutdown_port(bp, port); + spin_lock_irqsave(&port->lock, flags); + port->event = 0; + bp->count -= port->count; + if (bp->count < 0) { + printk(KERN_ERR "sx%d: sx_hangup: bad board count: %d port: %d\n", + board_No(bp), bp->count, tty->index); + bp->count = 0; + } + port->count = 0; + port->flags &= ~ASYNC_NORMAL_ACTIVE; + port->tty = NULL; + spin_unlock_irqrestore(&port->lock, flags); + wake_up_interruptible(&port->open_wait); + + func_exit(); +} + + +static void sx_set_termios(struct tty_struct * tty, struct termios * old_termios) +{ + struct specialix_port *port = (struct specialix_port *)tty->driver_data; + unsigned long flags; + struct specialix_board * bp; + + if (sx_paranoia_check(port, tty->name, "sx_set_termios")) + return; + + if (tty->termios->c_cflag == old_termios->c_cflag && + tty->termios->c_iflag == old_termios->c_iflag) + return; + + bp = port_Board(port); + spin_lock_irqsave(&port->lock, flags); + sx_change_speed(port_Board(port), port); + spin_unlock_irqrestore(&port->lock, flags); + + if ((old_termios->c_cflag & CRTSCTS) && + !(tty->termios->c_cflag & CRTSCTS)) { + tty->hw_stopped = 0; + sx_start(tty); + } +} + + +static void do_softint(void *private_) +{ + struct specialix_port *port = (struct specialix_port *) private_; + struct tty_struct *tty; + + func_enter(); + + if(!(tty = port->tty)) { + func_exit(); + return; + } + + if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) { + tty_wakeup(tty); + //wake_up_interruptible(&tty->write_wait); + } + + func_exit(); +} + +static struct tty_operations sx_ops = { + .open = sx_open, + .close = sx_close, + .write = sx_write, + .put_char = sx_put_char, + .flush_chars = sx_flush_chars, + .write_room = sx_write_room, + .chars_in_buffer = sx_chars_in_buffer, + .flush_buffer = sx_flush_buffer, + .ioctl = sx_ioctl, + .throttle = sx_throttle, + .unthrottle = sx_unthrottle, + .set_termios = sx_set_termios, + .stop = sx_stop, + .start = sx_start, + .hangup = sx_hangup, + .tiocmget = sx_tiocmget, + .tiocmset = sx_tiocmset, +}; + +static int sx_init_drivers(void) +{ + int error; + int i; + + func_enter(); + + specialix_driver = alloc_tty_driver(SX_NBOARD * SX_NPORT); + if (!specialix_driver) { + printk(KERN_ERR "sx: Couldn't allocate tty_driver.\n"); + func_exit(); + return 1; + } + + if (!(tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL))) { + printk(KERN_ERR "sx: Couldn't get free page.\n"); + put_tty_driver(specialix_driver); + func_exit(); + return 1; + } + specialix_driver->owner = THIS_MODULE; + specialix_driver->name = "ttyW"; + specialix_driver->major = SPECIALIX_NORMAL_MAJOR; + specialix_driver->type = TTY_DRIVER_TYPE_SERIAL; + specialix_driver->subtype = SERIAL_TYPE_NORMAL; + specialix_driver->init_termios = tty_std_termios; + specialix_driver->init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + specialix_driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(specialix_driver, &sx_ops); + + if ((error = tty_register_driver(specialix_driver))) { + put_tty_driver(specialix_driver); + free_page((unsigned long)tmp_buf); + printk(KERN_ERR "sx: Couldn't register specialix IO8+ driver, error = %d\n", + error); + func_exit(); + return 1; + } + memset(sx_port, 0, sizeof(sx_port)); + for (i = 0; i < SX_NPORT * SX_NBOARD; i++) { + sx_port[i].magic = SPECIALIX_MAGIC; + INIT_WORK(&sx_port[i].tqueue, do_softint, &sx_port[i]); + INIT_WORK(&sx_port[i].tqueue_hangup, do_sx_hangup, &sx_port[i]); + sx_port[i].close_delay = 50 * HZ/100; + sx_port[i].closing_wait = 3000 * HZ/100; + init_waitqueue_head(&sx_port[i].open_wait); + init_waitqueue_head(&sx_port[i].close_wait); + spin_lock_init(&sx_port[i].lock); + } + + func_exit(); + return 0; +} + +static void sx_release_drivers(void) +{ + func_enter(); + + free_page((unsigned long)tmp_buf); + tty_unregister_driver(specialix_driver); + put_tty_driver(specialix_driver); + func_exit(); +} + +/* + * This routine must be called by kernel at boot time + */ +static int __init specialix_init(void) +{ + int i; + int found = 0; + + func_enter(); + + printk(KERN_INFO "sx: Specialix IO8+ driver v" VERSION ", (c) R.E.Wolff 1997/1998.\n"); + printk(KERN_INFO "sx: derived from work (c) D.Gorodchanin 1994-1996.\n"); +#ifdef CONFIG_SPECIALIX_RTSCTS + printk (KERN_INFO "sx: DTR/RTS pin is always RTS.\n"); +#else + printk (KERN_INFO "sx: DTR/RTS pin is RTS when CRTSCTS is on.\n"); +#endif + + for (i = 0; i < SX_NBOARD; i++) + sx_board[i].lock = SPIN_LOCK_UNLOCKED; + + if (sx_init_drivers()) { + func_exit(); + return -EIO; + } + + for (i = 0; i < SX_NBOARD; i++) + if (sx_board[i].base && !sx_probe(&sx_board[i])) + found++; + +#ifdef CONFIG_PCI + { + struct pci_dev *pdev = NULL; + + i=0; + while (i < SX_NBOARD) { + if (sx_board[i].flags & SX_BOARD_PRESENT) { + i++; + continue; + } + pdev = pci_find_device (PCI_VENDOR_ID_SPECIALIX, + PCI_DEVICE_ID_SPECIALIX_IO8, + pdev); + if (!pdev) break; + + if (pci_enable_device(pdev)) + continue; + + sx_board[i].irq = pdev->irq; + + sx_board[i].base = pci_resource_start (pdev, 2); + + sx_board[i].flags |= SX_BOARD_IS_PCI; + if (!sx_probe(&sx_board[i])) + found ++; + } + } +#endif + + if (!found) { + sx_release_drivers(); + printk(KERN_INFO "sx: No specialix IO8+ boards detected.\n"); + func_exit(); + return -EIO; + } + + func_exit(); + return 0; +} + +static int iobase[SX_NBOARD] = {0,}; + +static int irq [SX_NBOARD] = {0,}; + +module_param_array(iobase, int, NULL, 0); +module_param_array(irq, int, NULL, 0); +module_param(sx_debug, int, 0); +module_param(sx_rxfifo, int, 0); +#ifdef SPECIALIX_TIMER +module_param(sx_poll, int, 0); +#endif + +/* + * You can setup up to 4 boards. + * by specifying "iobase=0xXXX,0xXXX ..." as insmod parameter. + * You should specify the IRQs too in that case "irq=....,...". + * + * More than 4 boards in one computer is not possible, as the card can + * only use 4 different interrupts. + * + */ +static int __init specialix_init_module(void) +{ + int i; + + func_enter(); + + init_MUTEX(&tmp_buf_sem); /* Init de the semaphore - pvdl */ + + if (iobase[0] || iobase[1] || iobase[2] || iobase[3]) { + for(i = 0; i < SX_NBOARD; i++) { + sx_board[i].base = iobase[i]; + sx_board[i].irq = irq[i]; + sx_board[i].count= 0; + } + } + + func_exit(); + + return specialix_init(); +} + +static void __exit specialix_exit_module(void) +{ + int i; + + func_enter(); + + sx_release_drivers(); + for (i = 0; i < SX_NBOARD; i++) + if (sx_board[i].flags & SX_BOARD_PRESENT) + sx_release_io_range(&sx_board[i]); +#ifdef SPECIALIX_TIMER + del_timer (&missed_irq_timer); +#endif + + func_exit(); +} + +module_init(specialix_init_module); +module_exit(specialix_exit_module); + +MODULE_LICENSE("GPL"); |
