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isicom.c
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/*
* 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.
*
* Original driver code supplied by Multi-Tech
*
* Changes
* 1/9/98 [email protected]
* Merge to 2.0.x kernel tree
* Obtain and use official major/minors
* Loader switched to a misc device
* (fixed range check bug as a side effect)
* Printk clean up
* 9/12/98 [email protected]
* Rough port to 2.1.x
*
* 10/6/99 sameer Merged the ISA and PCI drivers to
* a new unified driver.
*
* 3/9/99 sameer Added support for ISI4616 cards.
*
* 16/9/99 sameer We do not force RTS low anymore.
* This is to prevent the firmware
* from getting confused.
*
* 26/10/99 sameer Cosmetic changes:The driver now
* dumps the Port Count information
* along with I/O address and IRQ.
*
* 13/12/99 sameer Fixed the problem with IRQ sharing.
*
* 10/5/00 sameer Fixed isicom_shutdown_board()
* to not lower DTR on all the ports
* when the last port on the card is
* closed.
*
* 10/5/00 sameer Signal mask setup command added
* to isicom_setup_port and
* isicom_shutdown_port.
*
* 24/5/00 sameer The driver is now SMP aware.
*
*
* 27/11/00 Vinayak P Risbud Fixed the Driver Crash Problem
*
*
* 03/01/01 anil .s Added support for resetting the
* internal modems on ISI cards.
*
* 08/02/01 anil .s Upgraded the driver for kernel
* 2.4.x
*
* 11/04/01 Kevin Fixed firmware load problem with
* ISIHP-4X card
*
* 30/04/01 anil .s Fixed the remote login through
* ISI port problem. Now the link
* does not go down before password
* prompt.
*
* 03/05/01 anil .s Fixed the problem with IRQ sharing
* among ISI-PCI cards.
*
* 03/05/01 anil .s Added support to display the version
* info during insmod as well as module
* listing by lsmod.
*
* 10/05/01 anil .s Done the modifications to the source
* file and Install script so that the
* same installation can be used for
* 2.2.x and 2.4.x kernel.
*
* 06/06/01 anil .s Now we drop both dtr and rts during
* shutdown_port as well as raise them
* during isicom_config_port.
*
* 09/06/01 [email protected] use capable, not suser, do
* restore_flags on failure in
* isicom_send_break, verify put_user
* result
*
* 11/02/03 ranjeeth Added support for 230 Kbps and 460 Kbps
* Baud index extended to 21
*
* 20/03/03 ranjeeth Made to work for Linux Advanced server.
* Taken care of license warning.
*
* 10/12/03 Ravindra Made to work for Fedora Core 1 of
* Red Hat Distribution
*
* 06/01/05 Alan Cox Merged the ISI and base kernel strands
* into a single 2.6 driver
*
* ***********************************************************
*
* To use this driver you also need the support package. You
* can find this in RPM format on
* ftp://ftp.linux.org.uk/pub/linux/alan
*
* You can find the original tools for this direct from Multitech
* ftp://ftp.multitech.com/ISI-Cards/
*
* Having installed the cards the module options (/etc/modprobe.conf)
*
* options isicom io=card1,card2,card3,card4 irq=card1,card2,card3,card4
*
* Omit those entries for boards you don't have installed.
*
* TODO
* Merge testing
* 64-bit verification
*/
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/termios.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/system.h>
#include <linux/pci.h>
#include <linux/isicom.h>
#define InterruptTheCard(base) outw(0, (base) + 0xc)
#define ClearInterrupt(base) inw((base) + 0x0a)
#define pr_dbg(str...) pr_debug("ISICOM: " str)
#ifdef DEBUG
#define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
#else
#define isicom_paranoia_check(a, b, c) 0
#endif
static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
static void __devexit isicom_remove(struct pci_dev *);
static struct pci_device_id isicom_pci_tbl[] = {
{ PCI_DEVICE(VENDOR_ID, 0x2028) },
{ PCI_DEVICE(VENDOR_ID, 0x2051) },
{ PCI_DEVICE(VENDOR_ID, 0x2052) },
{ PCI_DEVICE(VENDOR_ID, 0x2053) },
{ PCI_DEVICE(VENDOR_ID, 0x2054) },
{ PCI_DEVICE(VENDOR_ID, 0x2055) },
{ PCI_DEVICE(VENDOR_ID, 0x2056) },
{ PCI_DEVICE(VENDOR_ID, 0x2057) },
{ PCI_DEVICE(VENDOR_ID, 0x2058) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
static struct pci_driver isicom_driver = {
.name = "isicom",
.id_table = isicom_pci_tbl,
.probe = isicom_probe,
.remove = __devexit_p(isicom_remove)
};
static int prev_card = 3; /* start servicing isi_card[0] */
static struct tty_driver *isicom_normal;
static void isicom_tx(unsigned long _data);
static void isicom_start(struct tty_struct *tty);
static DEFINE_TIMER(tx, isicom_tx, 0, 0);
/* baud index mappings from linux defns to isi */
static signed char linuxb_to_isib[] = {
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
};
struct isi_board {
unsigned long base;
int irq;
unsigned char port_count;
unsigned short status;
unsigned short port_status; /* each bit for each port */
unsigned short shift_count;
struct isi_port *ports;
signed char count;
spinlock_t card_lock; /* Card wide lock 11/5/00 -sameer */
unsigned long flags;
unsigned int index;
};
struct isi_port {
unsigned short magic;
struct tty_port port;
u16 channel;
u16 status;
struct isi_board *card;
unsigned char *xmit_buf;
int xmit_head;
int xmit_tail;
int xmit_cnt;
};
static struct isi_board isi_card[BOARD_COUNT];
static struct isi_port isi_ports[PORT_COUNT];
/*
* Locking functions for card level locking. We need to own both
* the kernel lock for the card and have the card in a position that
* it wants to talk.
*/
static inline int WaitTillCardIsFree(unsigned long base)
{
unsigned int count = 0;
unsigned int a = in_atomic(); /* do we run under spinlock? */
while (!(inw(base + 0xe) & 0x1) && count++ < 100)
if (a)
mdelay(1);
else
msleep(1);
return !(inw(base + 0xe) & 0x1);
}
static int lock_card(struct isi_board *card)
{
unsigned long base = card->base;
unsigned int retries, a;
for (retries = 0; retries < 10; retries++) {
spin_lock_irqsave(&card->card_lock, card->flags);
for (a = 0; a < 10; a++) {
if (inw(base + 0xe) & 0x1)
return 1;
udelay(10);
}
spin_unlock_irqrestore(&card->card_lock, card->flags);
msleep(10);
}
printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%lx)\n",
card->base);
return 0; /* Failed to acquire the card! */
}
static void unlock_card(struct isi_board *card)
{
spin_unlock_irqrestore(&card->card_lock, card->flags);
}
/*
* ISI Card specific ops ...
*/
/* card->lock HAS to be held */
static void raise_dtr(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (WaitTillCardIsFree(base))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0504, base);
InterruptTheCard(base);
port->status |= ISI_DTR;
}
/* card->lock HAS to be held */
static inline void drop_dtr(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (WaitTillCardIsFree(base))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0404, base);
InterruptTheCard(base);
port->status &= ~ISI_DTR;
}
/* card->lock HAS to be held */
static inline void raise_rts(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (WaitTillCardIsFree(base))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0a04, base);
InterruptTheCard(base);
port->status |= ISI_RTS;
}
/* card->lock HAS to be held */
static inline void drop_rts(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (WaitTillCardIsFree(base))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0804, base);
InterruptTheCard(base);
port->status &= ~ISI_RTS;
}
/* card->lock MUST NOT be held */
static void isicom_raise_dtr_rts(struct tty_port *port)
{
struct isi_port *ip = container_of(port, struct isi_port, port);
struct isi_board *card = ip->card;
unsigned long base = card->base;
u16 channel = ip->channel;
if (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0f04, base);
InterruptTheCard(base);
ip->status |= (ISI_DTR | ISI_RTS);
unlock_card(card);
}
/* card->lock HAS to be held */
static void drop_dtr_rts(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (WaitTillCardIsFree(base))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0c04, base);
InterruptTheCard(base);
port->status &= ~(ISI_RTS | ISI_DTR);
}
/*
* ISICOM Driver specific routines ...
*
*/
static inline int __isicom_paranoia_check(struct isi_port const *port,
char *name, const char *routine)
{
if (!port) {
printk(KERN_WARNING "ISICOM: Warning: bad isicom magic for "
"dev %s in %s.\n", name, routine);
return 1;
}
if (port->magic != ISICOM_MAGIC) {
printk(KERN_WARNING "ISICOM: Warning: NULL isicom port for "
"dev %s in %s.\n", name, routine);
return 1;
}
return 0;
}
/*
* Transmitter.
*
* We shovel data into the card buffers on a regular basis. The card
* will do the rest of the work for us.
*/
static void isicom_tx(unsigned long _data)
{
unsigned long flags, base;
unsigned int retries;
short count = (BOARD_COUNT-1), card;
short txcount, wrd, residue, word_count, cnt;
struct isi_port *port;
struct tty_struct *tty;
/* find next active board */
card = (prev_card + 1) & 0x0003;
while (count-- > 0) {
if (isi_card[card].status & BOARD_ACTIVE)
break;
card = (card + 1) & 0x0003;
}
if (!(isi_card[card].status & BOARD_ACTIVE))
goto sched_again;
prev_card = card;
count = isi_card[card].port_count;
port = isi_card[card].ports;
base = isi_card[card].base;
spin_lock_irqsave(&isi_card[card].card_lock, flags);
for (retries = 0; retries < 100; retries++) {
if (inw(base + 0xe) & 0x1)
break;
udelay(2);
}
if (retries >= 100)
goto unlock;
tty = tty_port_tty_get(&port->port);
if (tty == NULL)
goto put_unlock;
for (; count > 0; count--, port++) {
/* port not active or tx disabled to force flow control */
if (!(port->port.flags & ASYNC_INITIALIZED) ||
!(port->status & ISI_TXOK))
continue;
txcount = min_t(short, TX_SIZE, port->xmit_cnt);
if (txcount <= 0 || tty->stopped || tty->hw_stopped)
continue;
if (!(inw(base + 0x02) & (1 << port->channel)))
continue;
pr_dbg("txing %d bytes, port%d.\n", txcount,
port->channel + 1);
outw((port->channel << isi_card[card].shift_count) | txcount,
base);
residue = NO;
wrd = 0;
while (1) {
cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
- port->xmit_tail));
if (residue == YES) {
residue = NO;
if (cnt > 0) {
wrd |= (port->port.xmit_buf[port->xmit_tail]
<< 8);
port->xmit_tail = (port->xmit_tail + 1)
& (SERIAL_XMIT_SIZE - 1);
port->xmit_cnt--;
txcount--;
cnt--;
outw(wrd, base);
} else {
outw(wrd, base);
break;
}
}
if (cnt <= 0)
break;
word_count = cnt >> 1;
outsw(base, port->port.xmit_buf+port->xmit_tail, word_count);
port->xmit_tail = (port->xmit_tail
+ (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
txcount -= (word_count << 1);
port->xmit_cnt -= (word_count << 1);
if (cnt & 0x0001) {
residue = YES;
wrd = port->port.xmit_buf[port->xmit_tail];
port->xmit_tail = (port->xmit_tail + 1)
& (SERIAL_XMIT_SIZE - 1);
port->xmit_cnt--;
txcount--;
}
}
InterruptTheCard(base);
if (port->xmit_cnt <= 0)
port->status &= ~ISI_TXOK;
if (port->xmit_cnt <= WAKEUP_CHARS)
tty_wakeup(tty);
}
put_unlock:
tty_kref_put(tty);
unlock:
spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
/* schedule another tx for hopefully in about 10ms */
sched_again:
mod_timer(&tx, jiffies + msecs_to_jiffies(10));
}
/*
* Main interrupt handler routine
*/
static irqreturn_t isicom_interrupt(int irq, void *dev_id)
{
struct isi_board *card = dev_id;
struct isi_port *port;
struct tty_struct *tty;
unsigned long base;
u16 header, word_count, count, channel;
short byte_count;
unsigned char *rp;
if (!card || !(card->status & FIRMWARE_LOADED))
return IRQ_NONE;
base = card->base;
/* did the card interrupt us? */
if (!(inw(base + 0x0e) & 0x02))
return IRQ_NONE;
spin_lock(&card->card_lock);
/*
* disable any interrupts from the PCI card and lower the
* interrupt line
*/
outw(0x8000, base+0x04);
ClearInterrupt(base);
inw(base); /* get the dummy word out */
header = inw(base);
channel = (header & 0x7800) >> card->shift_count;
byte_count = header & 0xff;
if (channel + 1 > card->port_count) {
printk(KERN_WARNING "ISICOM: isicom_interrupt(0x%lx): "
"%d(channel) > port_count.\n", base, channel+1);
outw(0x0000, base+0x04); /* enable interrupts */
spin_unlock(&card->card_lock);
return IRQ_HANDLED;
}
port = card->ports + channel;
if (!(port->port.flags & ASYNC_INITIALIZED)) {
outw(0x0000, base+0x04); /* enable interrupts */
spin_unlock(&card->card_lock);
return IRQ_HANDLED;
}
tty = tty_port_tty_get(&port->port);
if (tty == NULL) {
word_count = byte_count >> 1;
while (byte_count > 1) {
inw(base);
byte_count -= 2;
}
if (byte_count & 0x01)
inw(base);
outw(0x0000, base+0x04); /* enable interrupts */
spin_unlock(&card->card_lock);
return IRQ_HANDLED;
}
if (header & 0x8000) { /* Status Packet */
header = inw(base);
switch (header & 0xff) {
case 0: /* Change in EIA signals */
if (port->port.flags & ASYNC_CHECK_CD) {
if (port->status & ISI_DCD) {
if (!(header & ISI_DCD)) {
/* Carrier has been lost */
pr_dbg("interrupt: DCD->low.\n"
);
port->status &= ~ISI_DCD;
tty_hangup(tty);
}
} else if (header & ISI_DCD) {
/* Carrier has been detected */
pr_dbg("interrupt: DCD->high.\n");
port->status |= ISI_DCD;
wake_up_interruptible(&port->port.open_wait);
}
} else {
if (header & ISI_DCD)
port->status |= ISI_DCD;
else
port->status &= ~ISI_DCD;
}
if (port->port.flags & ASYNC_CTS_FLOW) {
if (tty->hw_stopped) {
if (header & ISI_CTS) {
port->port.tty->hw_stopped = 0;
/* start tx ing */
port->status |= (ISI_TXOK
| ISI_CTS);
tty_wakeup(tty);
}
} else if (!(header & ISI_CTS)) {
tty->hw_stopped = 1;
/* stop tx ing */
port->status &= ~(ISI_TXOK | ISI_CTS);
}
} else {
if (header & ISI_CTS)
port->status |= ISI_CTS;
else
port->status &= ~ISI_CTS;
}
if (header & ISI_DSR)
port->status |= ISI_DSR;
else
port->status &= ~ISI_DSR;
if (header & ISI_RI)
port->status |= ISI_RI;
else
port->status &= ~ISI_RI;
break;
case 1: /* Received Break !!! */
tty_insert_flip_char(tty, 0, TTY_BREAK);
if (port->port.flags & ASYNC_SAK)
do_SAK(tty);
tty_flip_buffer_push(tty);
break;
case 2: /* Statistics */
pr_dbg("isicom_interrupt: stats!!!.\n");
break;
default:
pr_dbg("Intr: Unknown code in status packet.\n");
break;
}
} else { /* Data Packet */
count = tty_prepare_flip_string(tty, &rp, byte_count & ~1);
pr_dbg("Intr: Can rx %d of %d bytes.\n", count, byte_count);
word_count = count >> 1;
insw(base, rp, word_count);
byte_count -= (word_count << 1);
if (count & 0x0001) {
tty_insert_flip_char(tty, inw(base) & 0xff,
TTY_NORMAL);
byte_count -= 2;
}
if (byte_count > 0) {
pr_dbg("Intr(0x%lx:%d): Flip buffer overflow! dropping "
"bytes...\n", base, channel + 1);
/* drain out unread xtra data */
while (byte_count > 0) {
inw(base);
byte_count -= 2;
}
}
tty_flip_buffer_push(tty);
}
outw(0x0000, base+0x04); /* enable interrupts */
spin_unlock(&card->card_lock);
tty_kref_put(tty);
return IRQ_HANDLED;
}
static void isicom_config_port(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long baud;
unsigned long base = card->base;
u16 channel_setup, channel = port->channel,
shift_count = card->shift_count;
unsigned char flow_ctrl;
/* FIXME: Switch to new tty baud API */
baud = C_BAUD(tty);
if (baud & CBAUDEX) {
baud &= ~CBAUDEX;
/* if CBAUDEX bit is on and the baud is set to either 50 or 75
* then the card is programmed for 57.6Kbps or 115Kbps
* respectively.
*/
/* 1,2,3,4 => 57.6, 115.2, 230, 460 kbps resp. */
if (baud < 1 || baud > 4)
tty->termios->c_cflag &= ~CBAUDEX;
else
baud += 15;
}
if (baud == 15) {
/* the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set
* by the set_serial_info ioctl ... this is done by
* the 'setserial' utility.
*/
if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baud++; /* 57.6 Kbps */
if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baud += 2; /* 115 Kbps */
if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baud += 3; /* 230 kbps*/
if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baud += 4; /* 460 kbps*/
}
if (linuxb_to_isib[baud] == -1) {
/* hang up */
drop_dtr(port);
return;
} else
raise_dtr(port);
if (WaitTillCardIsFree(base) == 0) {
outw(0x8000 | (channel << shift_count) | 0x03, base);
outw(linuxb_to_isib[baud] << 8 | 0x03, base);
channel_setup = 0;
switch (C_CSIZE(tty)) {
case CS5:
channel_setup |= ISICOM_CS5;
break;
case CS6:
channel_setup |= ISICOM_CS6;
break;
case CS7:
channel_setup |= ISICOM_CS7;
break;
case CS8:
channel_setup |= ISICOM_CS8;
break;
}
if (C_CSTOPB(tty))
channel_setup |= ISICOM_2SB;
if (C_PARENB(tty)) {
channel_setup |= ISICOM_EVPAR;
if (C_PARODD(tty))
channel_setup |= ISICOM_ODPAR;
}
outw(channel_setup, base);
InterruptTheCard(base);
}
if (C_CLOCAL(tty))
port->port.flags &= ~ASYNC_CHECK_CD;
else
port->port.flags |= ASYNC_CHECK_CD;
/* flow control settings ...*/
flow_ctrl = 0;
port->port.flags &= ~ASYNC_CTS_FLOW;
if (C_CRTSCTS(tty)) {
port->port.flags |= ASYNC_CTS_FLOW;
flow_ctrl |= ISICOM_CTSRTS;
}
if (I_IXON(tty))
flow_ctrl |= ISICOM_RESPOND_XONXOFF;
if (I_IXOFF(tty))
flow_ctrl |= ISICOM_INITIATE_XONXOFF;
if (WaitTillCardIsFree(base) == 0) {
outw(0x8000 | (channel << shift_count) | 0x04, base);
outw(flow_ctrl << 8 | 0x05, base);
outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
InterruptTheCard(base);
}
/* rx enabled -> enable port for rx on the card */
if (C_CREAD(tty)) {
card->port_status |= (1 << channel);
outw(card->port_status, base + 0x02);
}
}
/* open et all */
static inline void isicom_setup_board(struct isi_board *bp)
{
int channel;
struct isi_port *port;
unsigned long flags;
spin_lock_irqsave(&bp->card_lock, flags);
if (bp->status & BOARD_ACTIVE) {
spin_unlock_irqrestore(&bp->card_lock, flags);
return;
}
port = bp->ports;
bp->status |= BOARD_ACTIVE;
for (channel = 0; channel < bp->port_count; channel++, port++)
drop_dtr_rts(port);
spin_unlock_irqrestore(&bp->card_lock, flags);
}
static int isicom_setup_port(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long flags;
if (port->port.flags & ASYNC_INITIALIZED)
return 0;
if (tty_port_alloc_xmit_buf(&port->port) < 0)
return -ENOMEM;
spin_lock_irqsave(&card->card_lock, flags);
clear_bit(TTY_IO_ERROR, &tty->flags);
if (port->port.count == 1)
card->count++;
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
/* discard any residual data */
if (WaitTillCardIsFree(card->base) == 0) {
outw(0x8000 | (port->channel << card->shift_count) | 0x02,
card->base);
outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
InterruptTheCard(card->base);
}
isicom_config_port(tty);
port->port.flags |= ASYNC_INITIALIZED;
spin_unlock_irqrestore(&card->card_lock, flags);
return 0;
}
static int isicom_carrier_raised(struct tty_port *port)
{
struct isi_port *ip = container_of(port, struct isi_port, port);
return (ip->status & ISI_DCD)?1 : 0;
}
static int isicom_open(struct tty_struct *tty, struct file *filp)
{
struct isi_port *port;
struct isi_board *card;
unsigned int board;
int error, line;
line = tty->index;
if (line < 0 || line > PORT_COUNT-1)
return -ENODEV;
board = BOARD(line);
card = &isi_card[board];
if (!(card->status & FIRMWARE_LOADED))
return -ENODEV;
/* open on a port greater than the port count for the card !!! */
if (line > ((board * 16) + card->port_count - 1))
return -ENODEV;
port = &isi_ports[line];
if (isicom_paranoia_check(port, tty->name, "isicom_open"))
return -ENODEV;
isicom_setup_board(card);
/* FIXME: locking on port.count etc */
port->port.count++;
tty->driver_data = port;
tty_port_tty_set(&port->port, tty);
error = isicom_setup_port(tty);
if (error == 0)
error = tty_port_block_til_ready(&port->port, tty, filp);
return error;
}
/* close et all */
static inline void isicom_shutdown_board(struct isi_board *bp)
{
if (bp->status & BOARD_ACTIVE)
bp->status &= ~BOARD_ACTIVE;
}
/* card->lock HAS to be held */
static void isicom_shutdown_port(struct isi_port *port)
{
struct isi_board *card = port->card;
struct tty_struct *tty;
tty = tty_port_tty_get(&port->port);
if (!(port->port.flags & ASYNC_INITIALIZED)) {
tty_kref_put(tty);
return;
}
tty_port_free_xmit_buf(&port->port);
port->port.flags &= ~ASYNC_INITIALIZED;
/* 3rd October 2000 : Vinayak P Risbud */
tty_port_tty_set(&port->port, NULL);
/*Fix done by Anil .S on 30-04-2001
remote login through isi port has dtr toggle problem
due to which the carrier drops before the password prompt
appears on the remote end. Now we drop the dtr only if the
HUPCL(Hangup on close) flag is set for the tty*/
if (C_HUPCL(tty))
/* drop dtr on this port */
drop_dtr(port);
/* any other port uninits */
if (tty)
set_bit(TTY_IO_ERROR, &tty->flags);
if (--card->count < 0) {
pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n",
card->base, card->count);
card->count = 0;
}
/* last port was closed, shutdown that boad too */
if (C_HUPCL(tty)) {
if (!card->count)
isicom_shutdown_board(card);
}
tty_kref_put(tty);
}
static void isicom_flush_buffer(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long flags;
if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
return;
spin_lock_irqsave(&card->card_lock, flags);
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
spin_unlock_irqrestore(&card->card_lock, flags);
tty_wakeup(tty);
}
static void isicom_close(struct tty_struct *tty, struct file *filp)
{
struct isi_port *ip = tty->driver_data;
struct tty_port *port = &ip->port;
struct isi_board *card;
unsigned long flags;
BUG_ON(!ip);
card = ip->card;
if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
return;
/* indicate to the card that no more data can be received
on this port */
spin_lock_irqsave(&card->card_lock, flags);
if (port->flags & ASYNC_INITIALIZED) {
card->port_status &= ~(1 << ip->channel);
outw(card->port_status, card->base + 0x02);
}
isicom_shutdown_port(ip);
spin_unlock_irqrestore(&card->card_lock, flags);
isicom_flush_buffer(tty);
tty_port_close_end(port, tty);
}
/* write et all */
static int isicom_write(struct tty_struct *tty, const unsigned char *buf,
int count)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long flags;
int cnt, total = 0;
if (isicom_paranoia_check(port, tty->name, "isicom_write"))
return 0;
spin_lock_irqsave(&card->card_lock, flags);
while (1) {
cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt
- 1, SERIAL_XMIT_SIZE - port->xmit_head));
if (cnt <= 0)
break;
memcpy(port->port.xmit_buf + port->xmit_head, buf, cnt);
port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE
- 1);
port->xmit_cnt += cnt;
buf += cnt;
count -= cnt;