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linux/drivers/char/isicom.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

2040 lines
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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 alan@redhat.com 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 alan@redhat.com 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 acme@conectiva.com.br 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 <asm/uaccess.h>
#include <asm/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)
#ifdef DEBUG
#define pr_dbg(str...) printk(KERN_DEBUG "ISICOM: " str)
#define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
#else
#define pr_dbg(str...) do { } while (0)
#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 struct timer_list tx;
static char re_schedule = 1;
static void isicom_tx(unsigned long _data);
static void isicom_start(struct tty_struct *tty);
/* 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
};
struct isi_board {
unsigned long base;
unsigned char 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;
unsigned char isa;
spinlock_t card_lock; /* Card wide lock 11/5/00 -sameer */
unsigned long flags;
};
struct isi_port {
unsigned short magic;
unsigned int flags;
int count;
int blocked_open;
int close_delay;
u16 channel;
u16 status;
u16 closing_wait;
struct isi_board * card;
struct tty_struct * tty;
wait_queue_head_t close_wait;
wait_queue_head_t open_wait;
struct work_struct hangup_tq;
struct work_struct bh_tqueue;
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 int lock_card(struct isi_board *card)
{
char retries;
unsigned long base = card->base;
for (retries = 0; retries < 100; retries++) {
spin_lock_irqsave(&card->card_lock, card->flags);
if (inw(base + 0xe) & 0x1) {
return 1;
} else {
spin_unlock_irqrestore(&card->card_lock, card->flags);
udelay(1000); /* 1ms */
}
}
printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%lx)\n",
card->base);
return 0; /* Failed to acquire the card! */
}
static int lock_card_at_interrupt(struct isi_board *card)
{
unsigned char retries;
unsigned long base = card->base;
for (retries = 0; retries < 200; retries++) {
spin_lock_irqsave(&card->card_lock, card->flags);
if (inw(base + 0xe) & 0x1)
return 1;
else
spin_unlock_irqrestore(&card->card_lock, card->flags);
}
/* Failing in interrupt is an acceptable event */
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 ...
*/
static void raise_dtr(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0504, base);
InterruptTheCard(base);
port->status |= ISI_DTR;
unlock_card(card);
}
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 (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0404, base);
InterruptTheCard(base);
port->status &= ~ISI_DTR;
unlock_card(card);
}
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 (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0a04, base);
InterruptTheCard(base);
port->status |= ISI_RTS;
unlock_card(card);
}
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 (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0804, base);
InterruptTheCard(base);
port->status &= ~ISI_RTS;
unlock_card(card);
}
static inline void raise_dtr_rts(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0f04, base);
InterruptTheCard(base);
port->status |= (ISI_DTR | ISI_RTS);
unlock_card(card);
}
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 (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0c04, base);
InterruptTheCard(base);
port->status &= ~(ISI_RTS | ISI_DTR);
unlock_card(card);
}
static inline void kill_queue(struct isi_port *port, short queue)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
u16 channel = port->channel;
if (!lock_card(card))
return;
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw((queue << 8) | 0x06, base);
InterruptTheCard(base);
unlock_card(card);
}
/*
* 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)
{
short count = (BOARD_COUNT-1), card, base;
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;
for (;count > 0;count--, port++) {
if (!lock_card_at_interrupt(&isi_card[card]))
continue;
/* port not active or tx disabled to force flow control */
if (!(port->flags & ASYNC_INITIALIZED) ||
!(port->status & ISI_TXOK))
unlock_card(&isi_card[card]);
continue;
tty = port->tty;
if (tty == NULL) {
unlock_card(&isi_card[card]);
continue;
}
txcount = min_t(short, TX_SIZE, port->xmit_cnt);
if (txcount <= 0 || tty->stopped || tty->hw_stopped) {
unlock_card(&isi_card[card]);
continue;
}
if (!(inw(base + 0x02) & (1 << port->channel))) {
unlock_card(&isi_card[card]);
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->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->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->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)
schedule_work(&port->bh_tqueue);
unlock_card(&isi_card[card]);
}
/* schedule another tx for hopefully in about 10ms */
sched_again:
if (!re_schedule) {
re_schedule = 2;
return;
}
init_timer(&tx);
tx.expires = jiffies + HZ/100;
tx.data = 0;
tx.function = isicom_tx;
add_timer(&tx);
return;
}
/* Interrupt handlers */
static void isicom_bottomhalf(void *data)
{
struct isi_port *port = (struct isi_port *) data;
struct tty_struct *tty = port->tty;
if (!tty)
return;
tty_wakeup(tty);
wake_up_interruptible(&tty->write_wait);
}
/*
* 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;
spin_lock(&card->card_lock);
if (card->isa == NO) {
/*
* 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);
if (card->isa)
ClearInterrupt(base);
else
outw(0x0000, base+0x04); /* enable interrupts */
spin_unlock(&card->card_lock);
return IRQ_HANDLED;
}
port = card->ports + channel;
if (!(port->flags & ASYNC_INITIALIZED)) {
if (card->isa)
ClearInterrupt(base);
else
outw(0x0000, base+0x04); /* enable interrupts */
return IRQ_HANDLED;
}
tty = port->tty;
if (tty == NULL) {
word_count = byte_count >> 1;
while(byte_count > 1) {
inw(base);
byte_count -= 2;
}
if (byte_count & 0x01)
inw(base);
if (card->isa == YES)
ClearInterrupt(base);
else
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->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;
schedule_work(&port->hangup_tq);
}
} else if (header & ISI_DCD) {
/* Carrier has been detected */
pr_dbg("interrupt: DCD->high.\n");
port->status |= ISI_DCD;
wake_up_interruptible(&port->open_wait);
}
} else {
if (header & ISI_DCD)
port->status |= ISI_DCD;
else
port->status &= ~ISI_DCD;
}
if (port->flags & ASYNC_CTS_FLOW) {
if (port->tty->hw_stopped) {
if (header & ISI_CTS) {
port->tty->hw_stopped = 0;
/* start tx ing */
port->status |= (ISI_TXOK
| ISI_CTS);
schedule_work(&port->bh_tqueue);
}
} else if (!(header & ISI_CTS)) {
port->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->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);
while(byte_count > 0) { /* drain out unread xtra data */
inw(base);
byte_count -= 2;
}
}
tty_flip_buffer_push(tty);
}
if (card->isa == YES)
ClearInterrupt(base);
else
outw(0x0000, base+0x04); /* enable interrupts */
return IRQ_HANDLED;
}
static void isicom_config_port(struct isi_port *port)
{
struct isi_board *card = port->card;
struct tty_struct *tty;
unsigned long baud;
unsigned long base = card->base;
u16 channel_setup, channel = port->channel,
shift_count = card->shift_count;
unsigned char flow_ctrl;
if (!(tty = port->tty) || !tty->termios)
return;
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.
*/
if (baud < 1 || baud > 2)
port->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->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baud++; /* 57.6 Kbps */
if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baud +=2; /* 115 Kbps */
}
if (linuxb_to_isib[baud] == -1) {
/* hang up */
drop_dtr(port);
return;
}
else
raise_dtr(port);
if (lock_card(card)) {
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);
unlock_card(card);
}
if (C_CLOCAL(tty))
port->flags &= ~ASYNC_CHECK_CD;
else
port->flags |= ASYNC_CHECK_CD;
/* flow control settings ...*/
flow_ctrl = 0;
port->flags &= ~ASYNC_CTS_FLOW;
if (C_CRTSCTS(tty)) {
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 (lock_card(card)) {
outw(0x8000 | (channel << shift_count) |0x04, base);
outw(flow_ctrl << 8 | 0x05, base);
outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
InterruptTheCard(base);
unlock_card(card);
}
/* 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;
spin_unlock_irqrestore(&bp->card_lock, flags);
for (channel = 0; channel < bp->port_count; channel++, port++)
drop_dtr_rts(port);
return;
}
static int isicom_setup_port(struct isi_port *port)
{
struct isi_board *card = port->card;
unsigned long flags;
if (port->flags & ASYNC_INITIALIZED) {
return 0;
}
if (!port->xmit_buf) {
unsigned long page;
if (!(page = get_zeroed_page(GFP_KERNEL)))
return -ENOMEM;
if (port->xmit_buf) {
free_page(page);
return -ERESTARTSYS;
}
port->xmit_buf = (unsigned char *) page;
}
spin_lock_irqsave(&card->card_lock, flags);
if (port->tty)
clear_bit(TTY_IO_ERROR, &port->tty->flags);
if (port->count == 1)
card->count++;
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
/* discard any residual data */
kill_queue(port, ISICOM_KILLTX | ISICOM_KILLRX);
isicom_config_port(port);
port->flags |= ASYNC_INITIALIZED;
spin_unlock_irqrestore(&card->card_lock, flags);
return 0;
}
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct isi_port *port)
{
struct isi_board *card = port->card;
int do_clocal = 0, retval;
unsigned long flags;
DECLARE_WAITQUEUE(wait, current);
/* block if port is in the process of being closed */
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
pr_dbg("block_til_ready: close in progress.\n");
interruptible_sleep_on(&port->close_wait);
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
}
/* if non-blocking mode is set ... */
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
pr_dbg("block_til_ready: non-block mode.\n");
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (C_CLOCAL(tty))
do_clocal = 1;
/* block waiting for DCD to be asserted, and while
callout dev is busy */
retval = 0;
add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
port->count--;
port->blocked_open++;
spin_unlock_irqrestore(&card->card_lock, flags);
while (1) {
raise_dtr_rts(port);
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 || (port->status & ISI_DCD))) {
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
port->count++;
port->blocked_open--;
spin_unlock_irqrestore(&card->card_lock, flags);
if (retval)
return retval;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
static int isicom_open(struct tty_struct *tty, struct file *filp)
{
struct isi_port *port;
struct isi_board *card;
unsigned int line, board;
int error;
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);
port->count++;
tty->driver_data = port;
port->tty = tty;
if ((error = isicom_setup_port(port))!=0)
return error;
if ((error = block_til_ready(tty, filp, port))!=0)
return error;
return 0;
}
/* close et all */
static inline void isicom_shutdown_board(struct isi_board *bp)
{
unsigned long flags;
spin_lock_irqsave(&bp->card_lock, flags);
if (bp->status & BOARD_ACTIVE) {
bp->status &= ~BOARD_ACTIVE;
}
spin_unlock_irqrestore(&bp->card_lock, flags);
}
static void isicom_shutdown_port(struct isi_port *port)
{
struct isi_board *card = port->card;
struct tty_struct *tty;
unsigned long flags;
tty = port->tty;
spin_lock_irqsave(&card->card_lock, flags);
if (!(port->flags & ASYNC_INITIALIZED)) {
spin_unlock_irqrestore(&card->card_lock, flags);
return;
}
if (port->xmit_buf) {
free_page((unsigned long) port->xmit_buf);
port->xmit_buf = NULL;
}
port->flags &= ~ASYNC_INITIALIZED;
/* 3rd October 2000 : Vinayak P Risbud */
port->tty = NULL;
spin_unlock_irqrestore(&card->card_lock, flags);
/*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);
}
}
static void isicom_close(struct tty_struct *tty, struct file *filp)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long flags;
if (!port)
return;
if (isicom_paranoia_check(port, tty->name, "isicom_close"))
return;
pr_dbg("Close start!!!.\n");
spin_lock_irqsave(&card->card_lock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&card->card_lock, flags);
return;
}
if (tty->count == 1 && port->count != 1) {
printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
"count tty->count = 1 port count = %d.\n",
card->base, port->count);
port->count = 1;
}
if (--port->count < 0) {
printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
"count for channel%d = %d", card->base, port->channel,
port->count);
port->count = 0;
}
if (port->count) {
spin_unlock_irqrestore(&card->card_lock, flags);
return;
}
port->flags |= ASYNC_CLOSING;
tty->closing = 1;
spin_unlock_irqrestore(&card->card_lock, flags);
if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, port->closing_wait);
/* 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 << port->channel);
outw(card->port_status, card->base + 0x02);
}
isicom_shutdown_port(port);
spin_unlock_irqrestore(&card->card_lock, flags);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
spin_lock_irqsave(&card->card_lock, flags);
tty->closing = 0;
if (port->blocked_open) {
spin_unlock_irqrestore(&card->card_lock, flags);
if (port->close_delay) {
pr_dbg("scheduling until time out.\n");
msleep_interruptible(
jiffies_to_msecs(port->close_delay));
}
spin_lock_irqsave(&card->card_lock, flags);
wake_up_interruptible(&port->open_wait);
}
port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
wake_up_interruptible(&port->close_wait);
spin_unlock_irqrestore(&card->card_lock, flags);
}
/* 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;
if (!port->xmit_buf)
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->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;
total += cnt;
}
if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
port->status |= ISI_TXOK;
spin_unlock_irqrestore(&card->card_lock, flags);
return total;
}
/* put_char et all */
static void isicom_put_char(struct tty_struct *tty, unsigned char ch)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
unsigned long flags;
if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
return;
if (!port->xmit_buf)
return;
spin_lock_irqsave(&card->card_lock, flags);
if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
spin_unlock_irqrestore(&card->card_lock, flags);
return;
}
port->xmit_buf[port->xmit_head++] = ch;
port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
port->xmit_cnt++;
spin_unlock_irqrestore(&card->card_lock, flags);
}
/* flush_chars et all */
static void isicom_flush_chars(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
return;
if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
!port->xmit_buf)
return;
/* this tells the transmitter to consider this port for
data output to the card ... that's the best we can do. */
port->status |= ISI_TXOK;
}
/* write_room et all */
static int isicom_write_room(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
int free;
if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
return 0;
free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
if (free < 0)
free = 0;
return free;
}
/* chars_in_buffer et all */
static int isicom_chars_in_buffer(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
return 0;
return port->xmit_cnt;
}
/* ioctl et all */
static inline void isicom_send_break(struct isi_port *port,
unsigned long length)
{
struct isi_board *card = port->card;
unsigned long base = card->base;
if (!lock_card(card))
return;
outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
outw((length & 0xff) << 8 | 0x00, base);
outw((length & 0xff00), base);
InterruptTheCard(base);
unlock_card(card);
}
static int isicom_tiocmget(struct tty_struct *tty, struct file *file)
{
struct isi_port *port = tty->driver_data;
/* just send the port status */
u16 status = port->status;
if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
return -ENODEV;
return ((status & ISI_RTS) ? TIOCM_RTS : 0) |
((status & ISI_DTR) ? TIOCM_DTR : 0) |
((status & ISI_DCD) ? TIOCM_CAR : 0) |
((status & ISI_DSR) ? TIOCM_DSR : 0) |
((status & ISI_CTS) ? TIOCM_CTS : 0) |
((status & ISI_RI ) ? TIOCM_RI : 0);
}
static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
return -ENODEV;
if (set & TIOCM_RTS)
raise_rts(port);
if (set & TIOCM_DTR)
raise_dtr(port);
if (clear & TIOCM_RTS)
drop_rts(port);
if (clear & TIOCM_DTR)
drop_dtr(port);
return 0;
}
static int isicom_set_serial_info(struct isi_port *port,
struct serial_struct __user *info)
{
struct serial_struct newinfo;
int reconfig_port;
if (copy_from_user(&newinfo, info, sizeof(newinfo)))
return -EFAULT;
reconfig_port = ((port->flags & ASYNC_SPD_MASK) !=
(newinfo.flags & ASYNC_SPD_MASK));
if (!capable(CAP_SYS_ADMIN)) {
if ((newinfo.close_delay != port->close_delay) ||
(newinfo.closing_wait != port->closing_wait) ||
((newinfo.flags & ~ASYNC_USR_MASK) !=
(port->flags & ~ASYNC_USR_MASK)))
return -EPERM;
port->flags = ((port->flags & ~ ASYNC_USR_MASK) |
(newinfo.flags & ASYNC_USR_MASK));
}
else {
port->close_delay = newinfo.close_delay;
port->closing_wait = newinfo.closing_wait;
port->flags = ((port->flags & ~ASYNC_FLAGS) |
(newinfo.flags & ASYNC_FLAGS));
}
if (reconfig_port) {
isicom_config_port(port);
}
return 0;
}
static int isicom_get_serial_info(struct isi_port *port,
struct serial_struct __user *info)
{
struct serial_struct out_info;
memset(&out_info, 0, sizeof(out_info));
/* out_info.type = ? */
out_info.line = port - isi_ports;
out_info.port = port->card->base;
out_info.irq = port->card->irq;
out_info.flags = port->flags;
/* out_info.baud_base = ? */
out_info.close_delay = port->close_delay;
out_info.closing_wait = port->closing_wait;
if (copy_to_user(info, &out_info, sizeof(out_info)))
return -EFAULT;
return 0;
}
static int isicom_ioctl(struct tty_struct *tty, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct isi_port *port = tty->driver_data;
void __user *argp = (void __user *)arg;
int retval;
if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
return -ENODEV;
switch(cmd) {
case TCSBRK:
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
if (!arg)
isicom_send_break(port, HZ/4);
return 0;
case TCSBRKP:
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
isicom_send_break(port, arg ? arg * (HZ/10) : HZ/4);
return 0;
case TIOCGSOFTCAR:
return put_user(C_CLOCAL(tty) ? 1 : 0,
(unsigned long __user *)argp);
case TIOCSSOFTCAR:
if (get_user(arg, (unsigned long __user *) argp))
return -EFAULT;
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
return 0;
case TIOCGSERIAL:
return isicom_get_serial_info(port, argp);
case TIOCSSERIAL:
return isicom_set_serial_info(port, argp);
default:
return -ENOIOCTLCMD;
}
return 0;
}
/* set_termios et all */
static void isicom_set_termios(struct tty_struct *tty,
struct termios *old_termios)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
return;
if (tty->termios->c_cflag == old_termios->c_cflag &&
tty->termios->c_iflag == old_termios->c_iflag)
return;
isicom_config_port(port);
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
isicom_start(tty);
}
}
/* throttle et all */
static void isicom_throttle(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
return;
/* tell the card that this port cannot handle any more data for now */
card->port_status &= ~(1 << port->channel);
outw(card->port_status, card->base + 0x02);
}
/* unthrottle et all */
static void isicom_unthrottle(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
struct isi_board *card = port->card;
if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
return;
/* tell the card that this port is ready to accept more data */
card->port_status |= (1 << port->channel);
outw(card->port_status, card->base + 0x02);
}
/* stop et all */
static void isicom_stop(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
return;
/* this tells the transmitter not to consider this port for
data output to the card. */
port->status &= ~ISI_TXOK;
}
/* start et all */
static void isicom_start(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_start"))
return;
/* this tells the transmitter to consider this port for
data output to the card. */
port->status |= ISI_TXOK;
}
/* hangup et all */
static void do_isicom_hangup(void *data)
{
struct isi_port *port = data;
struct tty_struct *tty;
tty = port->tty;
if (tty)
tty_hangup(tty);
}
static void isicom_hangup(struct tty_struct *tty)
{
struct isi_port *port = tty->driver_data;
if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
return;
isicom_shutdown_port(port);
port->count = 0;
port->flags &= ~ASYNC_NORMAL_ACTIVE;
port->tty = NULL;
wake_up_interruptible(&port->open_wait);
}
/* flush_buffer et all */
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);
wake_up_interruptible(&tty->write_wait);
tty_wakeup(tty);
}
/*
* Driver init and deinit functions
*/
static int __devinit isicom_register_ioregion(struct pci_dev *pdev,
const unsigned int index)
{
struct isi_board *board = pci_get_drvdata(pdev);
if (!board->base)
return -EINVAL;
if (!request_region(board->base, 16, ISICOM_NAME)) {
dev_dbg(&pdev->dev, "I/O Region 0x%lx-0x%lx is busy. Card%d "
"will be disabled.\n", board->base, board->base + 15,
index + 1);
return -EBUSY;
}
return 0;
}
static void isicom_unregister_ioregion(struct pci_dev *pdev)
{
struct isi_board *board = pci_get_drvdata(pdev);
if (!board->base)
return;
release_region(board->base, 16);
dev_dbg(&pdev->dev, "I/O Region 0x%lx-0x%lx released.\n",
board->base, board->base + 15);
board->base = 0;
}
static const struct tty_operations isicom_ops = {
.open = isicom_open,
.close = isicom_close,
.write = isicom_write,
.put_char = isicom_put_char,
.flush_chars = isicom_flush_chars,
.write_room = isicom_write_room,
.chars_in_buffer = isicom_chars_in_buffer,
.ioctl = isicom_ioctl,
.set_termios = isicom_set_termios,
.throttle = isicom_throttle,
.unthrottle = isicom_unthrottle,
.stop = isicom_stop,
.start = isicom_start,
.hangup = isicom_hangup,
.flush_buffer = isicom_flush_buffer,
.tiocmget = isicom_tiocmget,
.tiocmset = isicom_tiocmset,
};
static int __devinit isicom_register_tty_driver(void)
{
int error = -ENOMEM;
/* tty driver structure initialization */
isicom_normal = alloc_tty_driver(PORT_COUNT);
if (!isicom_normal)
goto end;
isicom_normal->owner = THIS_MODULE;
isicom_normal->name = "ttyM";
isicom_normal->major = ISICOM_NMAJOR;
isicom_normal->minor_start = 0;
isicom_normal->type = TTY_DRIVER_TYPE_SERIAL;
isicom_normal->subtype = SERIAL_TYPE_NORMAL;
isicom_normal->init_termios = tty_std_termios;
isicom_normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
CLOCAL;
isicom_normal->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(isicom_normal, &isicom_ops);
if ((error = tty_register_driver(isicom_normal))) {
pr_dbg("Couldn't register the dialin driver, error=%d\n",
error);
put_tty_driver(isicom_normal);
}
end:
return error;
}
static void isicom_unregister_tty_driver(void)
{
int error;
if ((error = tty_unregister_driver(isicom_normal)))
pr_dbg("couldn't unregister normal driver, error=%d.\n", error);
put_tty_driver(isicom_normal);
}
static int __devinit isicom_register_isr(struct pci_dev *pdev,
const unsigned int index)
{
struct isi_board *board = pci_get_drvdata(pdev);
unsigned long irqflags = IRQF_DISABLED;
int retval = -EINVAL;
if (!board->base)
goto end;
if (board->isa == NO)
irqflags |= IRQF_SHARED;
retval = request_irq(board->irq, isicom_interrupt, irqflags,
ISICOM_NAME, board);
if (retval < 0)
dev_warn(&pdev->dev, "Could not install handler at Irq %d. "
"Card%d will be disabled.\n", board->irq, index + 1);
else
retval = 0;
end:
return retval;
}
static int __devinit reset_card(struct pci_dev *pdev,
const unsigned int card, unsigned int *signature)
{
struct isi_board *board = pci_get_drvdata(pdev);
unsigned long base = board->base;
unsigned int portcount = 0;
int retval = 0;
dev_dbg(&pdev->dev, "ISILoad:Resetting Card%d at 0x%lx\n", card + 1,
base);
inw(base + 0x8);
mdelay(10);
outw(0, base + 0x8); /* Reset */
msleep(3000);
*signature = inw(base + 0x4) & 0xff;
if (board->isa == YES) {
if (!(inw(base + 0xe) & 0x1) || (inw(base + 0x2))) {
dev_dbg(&pdev->dev, "base+0x2=0x%lx, base+0xe=0x%lx\n",
inw(base + 0x2), inw(base + 0xe));
dev_err(&pdev->dev, "ISILoad:ISA Card%d reset failure "
"(Possible bad I/O Port Address 0x%lx).\n",
card + 1, base);
retval = -EIO;
goto end;
}
} else {
portcount = inw(base + 0x2);
if (!(inw(base + 0xe) & 0x1) || ((portcount != 0) &&
(portcount != 4) && (portcount != 8))) {
dev_dbg(&pdev->dev, "base+0x2=0x%lx, base+0xe=0x%lx\n",
inw(base + 0x2), inw(base + 0xe));
dev_err(&pdev->dev, "ISILoad:PCI Card%d reset failure "
"(Possible bad I/O Port Address 0x%lx).\n",
card + 1, base);
retval = -EIO;
goto end;
}
}
switch (*signature) {
case 0xa5:
case 0xbb:
case 0xdd:
board->port_count = (board->isa == NO && portcount == 4) ? 4 :
8;
board->shift_count = 12;
break;
case 0xcc:
board->port_count = 16;
board->shift_count = 11;
break;
default:
dev_warn(&pdev->dev, "ISILoad:Card%d reset failure (Possible "
"bad I/O Port Address 0x%lx).\n", card + 1, base);
dev_dbg(&pdev->dev, "Sig=0x%lx\n", signature);
retval = -EIO;
}
dev_info(&pdev->dev, "-Done\n");
end:
return retval;
}
static inline int WaitTillCardIsFree(u16 base)
{
unsigned long count = 0;
while (!(inw(base + 0xe) & 0x1) && count++ < 100)
msleep(5);
return !(inw(base + 0xe) & 0x1);
}
static int __devinit load_firmware(struct pci_dev *pdev,
const unsigned int index, const unsigned int signature)
{
struct isi_board *board = pci_get_drvdata(pdev);
const struct firmware *fw;
unsigned long base = board->base;
unsigned int a;
u16 word_count, status;
int retval = -EIO;
char *name;
u8 *data;
struct stframe {
u16 addr;
u16 count;
u8 data[0];
} *frame;
switch (signature) {
case 0xa5:
name = "isi608.bin";
break;
case 0xbb:
name = "isi608em.bin";
break;
case 0xcc:
name = "isi616em.bin";
break;
case 0xdd:
name = "isi4608.bin";
break;
case 0xee:
name = "isi4616.bin";
break;
default:
dev_err(&pdev->dev, "Unknown signature.\n");
goto end;
}
retval = request_firmware(&fw, name, &pdev->dev);
if (retval)
goto end;
retval = -EIO;
for (frame = (struct stframe *)fw->data;
frame < (struct stframe *)(fw->data + fw->size);
frame = (struct stframe *)((u8 *)(frame + 1) +
frame->count)) {
if (WaitTillCardIsFree(base))
goto errrelfw;
outw(0xf0, base); /* start upload sequence */
outw(0x00, base);
outw(frame->addr, base); /* lsb of address */
word_count = frame->count / 2 + frame->count % 2;
outw(word_count, base);
InterruptTheCard(base);
udelay(100); /* 0x2f */
if (WaitTillCardIsFree(base))
goto errrelfw;
if ((status = inw(base + 0x4)) != 0) {
dev_warn(&pdev->dev, "Card%d rejected load header:\n"
"Address:0x%x\nCount:0x%x\nStatus:0x%x\n",
index + 1, frame->addr, frame->count, status);
goto errrelfw;
}
outsw(base, frame->data, word_count);
InterruptTheCard(base);
udelay(50); /* 0x0f */
if (WaitTillCardIsFree(base))
goto errrelfw;
if ((status = inw(base + 0x4)) != 0) {
dev_err(&pdev->dev, "Card%d got out of sync.Card "
"Status:0x%x\n", index + 1, status);
goto errrelfw;
}
}
/* XXX: should we test it by reading it back and comparing with original like
* in load firmware package? */
for (frame = (struct stframe *)fw->data;
frame < (struct stframe *)(fw->data + fw->size);
frame = (struct stframe *)((u8 *)(frame + 1) +
frame->count)) {
if (WaitTillCardIsFree(base))
goto errrelfw;
outw(0xf1, base); /* start download sequence */
outw(0x00, base);
outw(frame->addr, base); /* lsb of address */
word_count = (frame->count >> 1) + frame->count % 2;
outw(word_count + 1, base);
InterruptTheCard(base);
udelay(50); /* 0xf */
if (WaitTillCardIsFree(base))
goto errrelfw;
if ((status = inw(base + 0x4)) != 0) {
dev_warn(&pdev->dev, "Card%d rejected verify header:\n"
"Address:0x%x\nCount:0x%x\nStatus: 0x%x\n",
index + 1, frame->addr, frame->count, status);
goto errrelfw;
}
data = kmalloc(word_count * 2, GFP_KERNEL);
inw(base);
insw(base, data, word_count);
InterruptTheCard(base);
for (a = 0; a < frame->count; a++)
if (data[a] != frame->data[a]) {
kfree(data);
dev_err(&pdev->dev, "Card%d, firmware upload "
"failed\n", index + 1);
goto errrelfw;
}
kfree(data);
udelay(50); /* 0xf */
if (WaitTillCardIsFree(base))
goto errrelfw;
if ((status = inw(base + 0x4)) != 0) {
dev_err(&pdev->dev, "Card%d verify got out of sync. "
"Card Status:0x%x\n", index + 1, status);
goto errrelfw;
}
}
/* xfer ctrl */
if (WaitTillCardIsFree(base))
goto errrelfw;
outw(0xf2, base);
outw(0x800, base);
outw(0x0, base);
outw(0x0, base);
InterruptTheCard(base);
outw(0x0, base + 0x4); /* for ISI4608 cards */
board->status |= FIRMWARE_LOADED;
retval = 0;
errrelfw:
release_firmware(fw);
end:
return retval;
}
/*
* Insmod can set static symbols so keep these static
*/
static int io[4];
static int irq[4];
static int card;
static int __devinit isicom_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
unsigned int ioaddr, signature, index;
int retval = -EPERM;
u8 pciirq;
struct isi_board *board = NULL;
if (card >= BOARD_COUNT)
goto err;
ioaddr = pci_resource_start(pdev, 3);
/* i.e at offset 0x1c in the PCI configuration register space. */
pciirq = pdev->irq;
dev_info(&pdev->dev, "ISI PCI Card(Device ID 0x%x)\n", ent->device);
/* allot the first empty slot in the array */
for (index = 0; index < BOARD_COUNT; index++)
if (isi_card[index].base == 0) {
board = &isi_card[index];
break;
}
board->base = ioaddr;
board->irq = pciirq;
board->isa = NO;
card++;
pci_set_drvdata(pdev, board);
retval = isicom_register_ioregion(pdev, index);
if (retval < 0)
goto err;
retval = isicom_register_isr(pdev, index);
if (retval < 0)
goto errunrr;
retval = reset_card(pdev, index, &signature);
if (retval < 0)
goto errunri;
retval = load_firmware(pdev, index, signature);
if (retval < 0)
goto errunri;
return 0;
errunri:
free_irq(board->irq, board);
errunrr:
isicom_unregister_ioregion(pdev);
err:
board->base = 0;
return retval;
}
static void __devexit isicom_remove(struct pci_dev *pdev)
{
struct isi_board *board = pci_get_drvdata(pdev);
free_irq(board->irq, board);
isicom_unregister_ioregion(pdev);
}
static int __devinit isicom_setup(void)
{
int retval, idx, channel;
struct isi_port *port;
card = 0;
memset(isi_ports, 0, sizeof(isi_ports));
for(idx = 0; idx < BOARD_COUNT; idx++) {
port = &isi_ports[idx * 16];
isi_card[idx].ports = port;
spin_lock_init(&isi_card[idx].card_lock);
for (channel = 0; channel < 16; channel++, port++) {
port->magic = ISICOM_MAGIC;
port->card = &isi_card[idx];
port->channel = channel;
port->close_delay = 50 * HZ/100;
port->closing_wait = 3000 * HZ/100;
INIT_WORK(&port->hangup_tq, do_isicom_hangup, port);
INIT_WORK(&port->bh_tqueue, isicom_bottomhalf, port);
port->status = 0;
init_waitqueue_head(&port->open_wait);
init_waitqueue_head(&port->close_wait);
/* . . . */
}
isi_card[idx].base = 0;
isi_card[idx].irq = 0;
if (!io[idx])
continue;
if (irq[idx] == 2 || irq[idx] == 3 || irq[idx] == 4 ||
irq[idx] == 5 || irq[idx] == 7 ||
irq[idx] == 10 || irq[idx] == 11 ||
irq[idx] == 12 || irq[idx] == 15) {
printk(KERN_ERR "ISICOM: ISA not supported yet.\n");
retval = -EINVAL;
goto error;
} else
printk(KERN_ERR "ISICOM: Irq %d unsupported. "
"Disabling Card%d...\n", irq[idx], idx + 1);
}
retval = isicom_register_tty_driver();
if (retval < 0)
goto error;
retval = pci_register_driver(&isicom_driver);
if (retval < 0) {
printk(KERN_ERR "ISICOM: Unable to register pci driver.\n");
goto errtty;
}
init_timer(&tx);
tx.expires = jiffies + 1;
tx.data = 0;
tx.function = isicom_tx;
re_schedule = 1;
add_timer(&tx);
return 0;
errtty:
isicom_unregister_tty_driver();
error:
return retval;
}
static void __exit isicom_exit(void)
{
unsigned int index = 0;
re_schedule = 0;
while (re_schedule != 2 && index++ < 100)
msleep(10);
pci_unregister_driver(&isicom_driver);
isicom_unregister_tty_driver();
}
module_init(isicom_setup);
module_exit(isicom_exit);
MODULE_AUTHOR("MultiTech");
MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
MODULE_LICENSE("GPL");
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "I/O ports for the cards");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "Interrupts for the cards");
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