嵌入式Linux

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stallion.c：源码内容

ioaddr += EREG_BANKSIZE;
brdp->nrports += panelp->nrports;
brdp->panels[panelnr++] = panelp;
if ((brdp->brdtype != BRD_ECHPCI) &&
(ioaddr >= (brdp->ioaddr2 + brdp->iosize2)))
break;
}
brdp->nrpanels = panelnr;
brdp->nrbnks = banknr;
if (brdp->brdtype == BRD_ECH)
outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
brdp->state |= BRD_FOUND;
i = stl_mapirq(brdp->irq, name);
return(i);
}
/*****************************************************************************/
/*
* Initialize and configure the specified board.
* Scan through all the boards in the configuration and see what we
* can find. Handle EIO and the ECH boards a little differently here
* since the initial search and setup is very different.
*/
static int __init stl_brdinit(stlbrd_t *brdp)
{
int i;
#if DEBUG
printk("stl_brdinit(brdp=%x)n", (int) brdp);
#endif
switch (brdp->brdtype) {
case BRD_EASYIO:
case BRD_EASYIOPCI:
stl_initeio(brdp);
break;
case BRD_ECH:
case BRD_ECHMC:
case BRD_ECHPCI:
case BRD_ECH64PCI:
stl_initech(brdp);
break;
default:
printk("STALLION: board=%d is unknown board type=%dn",
brdp->brdnr, brdp->brdtype);
return(ENODEV);
}
stl_brds[brdp->brdnr] = brdp;
if ((brdp->state & BRD_FOUND) == 0) {
printk("STALLION: %s board not found, board=%d io=%x irq=%dn",
stl_brdnames[brdp->brdtype], brdp->brdnr,
brdp->ioaddr1, brdp->irq);
return(ENODEV);
}
for (i = 0; (i < STL_MAXPANELS); i++)
if (brdp->panels[i] != (stlpanel_t *) NULL)
stl_initports(brdp, brdp->panels[i]);
printk("STALLION: %s found, board=%d io=%x irq=%d "
"nrpanels=%d nrports=%dn", stl_brdnames[brdp->brdtype],
brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
brdp->nrports);
return(0);
}
/*****************************************************************************/
/*
* Find the next available board number that is free.
*/
static inline int stl_getbrdnr()
{
int i;
for (i = 0; (i < STL_MAXBRDS); i++) {
if (stl_brds[i] == (stlbrd_t *) NULL) {
if (i >= stl_nrbrds)
stl_nrbrds = i + 1;
return(i);
}
}
return(-1);
}
/*****************************************************************************/
#ifdef CONFIG_PCI
/*
* We have a Stallion board. Allocate a board structure and
* initialize it. Read its IO and IRQ resources from PCI
* configuration space.
*/
static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp)
{
stlbrd_t *brdp;
#if DEBUG
printk("stl_initpcibrd(brdtype=%d,busnr=%x,devnr=%x)n", brdtype,
devp->bus->number, devp->devfn);
#endif
if (pci_enable_device(devp))
return(-EIO);
if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
return(-ENOMEM);
if ((brdp->brdnr = stl_getbrdnr()) < 0) {
printk("STALLION: too many boards found, "
"maximum supported %dn", STL_MAXBRDS);
return(0);
}
brdp->brdtype = brdtype;
/*
* Different Stallion boards use the BAR registers in different ways,
* so set up io addresses based on board type.
*/
#if DEBUG
printk("%s(%d): BAR[]=%x,%x,%x,%x IRQ=%xn", __FILE__, __LINE__,
pci_resource_start(devp, 0), pci_resource_start(devp, 1),
pci_resource_start(devp, 2), pci_resource_start(devp, 3), devp->irq);
#endif
/*
* We have all resources from the board, so let's setup the actual
* board structure now.
*/
switch (brdtype) {
case BRD_ECHPCI:
brdp->ioaddr2 = pci_resource_start(devp, 0);
brdp->ioaddr1 = pci_resource_start(devp, 1);
break;
case BRD_ECH64PCI:
brdp->ioaddr2 = pci_resource_start(devp, 2);
brdp->ioaddr1 = pci_resource_start(devp, 1);
break;
case BRD_EASYIOPCI:
brdp->ioaddr1 = pci_resource_start(devp, 2);
brdp->ioaddr2 = pci_resource_start(devp, 1);
break;
default:
printk("STALLION: unknown PCI board type=%dn", brdtype);
break;
}
brdp->irq = devp->irq;
stl_brdinit(brdp);
return(0);
}
/*****************************************************************************/
/*
* Find all Stallion PCI boards that might be installed. Initialize each
* one as it is found.
*/
static inline int stl_findpcibrds()
{
struct pci_dev *dev = NULL;
int i, rc;
#if DEBUG
printk("stl_findpcibrds()n");
#endif
if (! pci_present())
return(0);
for (i = 0; (i < stl_nrpcibrds); i++)
while ((dev = pci_find_device(stl_pcibrds[i].vendid,
stl_pcibrds[i].devid, dev))) {
/*
* Found a device on the PCI bus that has our vendor and
* device ID. Need to check now that it is really us.
*/
if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
continue;
rc = stl_initpcibrd(stl_pcibrds[i].brdtype, dev);
if (rc)
return(rc);
}
return(0);
}
#endif
/*****************************************************************************/
/*
* Scan through all the boards in the configuration and see what we
* can find. Handle EIO and the ECH boards a little differently here
* since the initial search and setup is too different.
*/
static inline int stl_initbrds()
{
stlbrd_t *brdp;
stlconf_t *confp;
int i;
#if DEBUG
printk("stl_initbrds()n");
#endif
if (stl_nrbrds > STL_MAXBRDS) {
printk("STALLION: too many boards in configuration table, "
"truncating to %dn", STL_MAXBRDS);
stl_nrbrds = STL_MAXBRDS;
}
/*
* Firstly scan the list of static boards configured. Allocate
* resources and initialize the boards as found.
*/
for (i = 0; (i < stl_nrbrds); i++) {
confp = &stl_brdconf[i];
#ifdef MODULE
stl_parsebrd(confp, stl_brdsp[i]);
#endif
if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
return(-ENOMEM);
brdp->brdnr = i;
brdp->brdtype = confp->brdtype;
brdp->ioaddr1 = confp->ioaddr1;
brdp->ioaddr2 = confp->ioaddr2;
brdp->irq = confp->irq;
brdp->irqtype = confp->irqtype;
stl_brdinit(brdp);
}
/*
* Find any dynamically supported boards. That is via module load
* line options or auto-detected on the PCI bus.
*/
#ifdef MODULE
stl_argbrds();
#endif
#ifdef CONFIG_PCI
stl_findpcibrds();
#endif
return(0);
}
/*****************************************************************************/
/*
* Return the board stats structure to user app.
*/
static int stl_getbrdstats(combrd_t *bp)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
int i;
copy_from_user(&stl_brdstats, bp, sizeof(combrd_t));
if (stl_brdstats.brd >= STL_MAXBRDS)
return(-ENODEV);
brdp = stl_brds[stl_brdstats.brd];
if (brdp == (stlbrd_t *) NULL)
return(-ENODEV);
memset(&stl_brdstats, 0, sizeof(combrd_t));
stl_brdstats.brd = brdp->brdnr;
stl_brdstats.type = brdp->brdtype;
stl_brdstats.hwid = brdp->hwid;
stl_brdstats.state = brdp->state;
stl_brdstats.ioaddr = brdp->ioaddr1;
stl_brdstats.ioaddr2 = brdp->ioaddr2;
stl_brdstats.irq = brdp->irq;
stl_brdstats.nrpanels = brdp->nrpanels;
stl_brdstats.nrports = brdp->nrports;
for (i = 0; (i < brdp->nrpanels); i++) {
panelp = brdp->panels[i];
stl_brdstats.panels[i].panel = i;
stl_brdstats.panels[i].hwid = panelp->hwid;
stl_brdstats.panels[i].nrports = panelp->nrports;
}
copy_to_user(bp, &stl_brdstats, sizeof(combrd_t));
return(0);
}
/*****************************************************************************/
/*
* Resolve the referenced port number into a port struct pointer.
*/
static stlport_t *stl_getport(int brdnr, int panelnr, int portnr)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
return((stlport_t *) NULL);
brdp = stl_brds[brdnr];
if (brdp == (stlbrd_t *) NULL)
return((stlport_t *) NULL);
if ((panelnr < 0) || (panelnr >= brdp->nrpanels))
return((stlport_t *) NULL);
panelp = brdp->panels[panelnr];
if (panelp == (stlpanel_t *) NULL)
return((stlport_t *) NULL);
if ((portnr < 0) || (portnr >= panelp->nrports))
return((stlport_t *) NULL);
return(panelp->ports[portnr]);
}
/*****************************************************************************/
/*
* Return the port stats structure to user app. A NULL port struct
* pointer passed in means that we need to find out from the app
* what port to get stats for (used through board control device).
*/
static int stl_getportstats(stlport_t *portp, comstats_t *cp)
{
unsigned char *head, *tail;
unsigned long flags;
if (portp == (stlport_t *) NULL) {
copy_from_user(&stl_comstats, cp, sizeof(comstats_t));
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == (stlport_t *) NULL)
return(-ENODEV);
}
portp->stats.state = portp->istate;
portp->stats.flags = portp->flags;
portp->stats.hwid = portp->hwid;
portp->stats.ttystate = 0;
portp->stats.cflags = 0;
portp->stats.iflags = 0;
portp->stats.oflags = 0;
portp->stats.lflags = 0;
portp->stats.rxbuffered = 0;
save_flags(flags);
cli();
if (portp->tty != (struct tty_struct *) NULL) {
if (portp->tty->driver_data == portp) {
portp->stats.ttystate = portp->tty->flags;
portp->stats.rxbuffered = portp->tty->flip.count;
if (portp->tty->termios != (struct termios *) NULL) {
portp->stats.cflags = portp->tty->termios->c_cflag;
portp->stats.iflags = portp->tty->termios->c_iflag;
portp->stats.oflags = portp->tty->termios->c_oflag;
portp->stats.lflags = portp->tty->termios->c_lflag;
}
}
}
restore_flags(flags);
head = portp->tx.head;
tail = portp->tx.tail;
portp->stats.txbuffered = ((head >= tail) ? (head - tail) :
(STL_TXBUFSIZE - (tail - head)));
portp->stats.signals = (unsigned long) stl_getsignals(portp);
copy_to_user(cp, &portp->stats, sizeof(comstats_t));
return(0);
}
/*****************************************************************************/
/*
* Clear the port stats structure. We also return it zeroed out...
*/
static int stl_clrportstats(stlport_t *portp, comstats_t *cp)
{
if (portp == (stlport_t *) NULL) {
copy_from_user(&stl_comstats, cp, sizeof(comstats_t));
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == (stlport_t *) NULL)
return(-ENODEV);
}
memset(&portp->stats, 0, sizeof(comstats_t));
portp->stats.brd = portp->brdnr;
portp->stats.panel = portp->panelnr;
portp->stats.port = portp->portnr;
copy_to_user(cp, &portp->stats, sizeof(comstats_t));
return(0);
}
/*****************************************************************************/
/*
* Return the entire driver ports structure to a user app.
*/
static int stl_getportstruct(unsigned long arg)
{
stlport_t *portp;
copy_from_user(&stl_dummyport, (void *) arg, sizeof(stlport_t));
portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
stl_dummyport.portnr);
if (portp == (stlport_t *) NULL)
return(-ENODEV);
copy_to_user((void *) arg, portp, sizeof(stlport_t));
return(0);
}
/*****************************************************************************/
/*
* Return the entire driver board structure to a user app.
*/
static int stl_getbrdstruct(unsigned long arg)
{
stlbrd_t *brdp;
copy_from_user(&stl_dummybrd, (void *) arg, sizeof(stlbrd_t));
if ((stl_dummybrd.brdnr < 0) || (stl_dummybrd.brdnr >= STL_MAXBRDS))
return(-ENODEV);
brdp = stl_brds[stl_dummybrd.brdnr];
if (brdp == (stlbrd_t *) NULL)
return(-ENODEV);
copy_to_user((void *) arg, brdp, sizeof(stlbrd_t));
return(0);
}
/*****************************************************************************/
/*
* The "staliomem" device is also required to do some special operations
* on the board and/or ports. In this driver it is mostly used for stats
* collection.
*/
static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
{
int brdnr, rc;
#if DEBUG
printk("stl_memioctl(ip=%x,fp=%x,cmd=%x,arg=%x)n", (int) ip,
(int) fp, cmd, (int) arg);
#endif
brdnr = MINOR(ip->i_rdev);
if (brdnr >= STL_MAXBRDS)
return(-ENODEV);
rc = 0;
switch (cmd) {
case COM_GETPORTSTATS:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(comstats_t))) == 0)
rc = stl_getportstats((stlport_t *) NULL,
(comstats_t *) arg);
break;
case COM_CLRPORTSTATS:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(comstats_t))) == 0)
rc = stl_clrportstats((stlport_t *) NULL,
(comstats_t *) arg);
break;
case COM_GETBRDSTATS:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(combrd_t))) == 0)
rc = stl_getbrdstats((combrd_t *) arg);
break;
case COM_READPORT:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(stlport_t))) == 0)
rc = stl_getportstruct(arg);
break;
case COM_READBOARD:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(stlbrd_t))) == 0)
rc = stl_getbrdstruct(arg);
break;
default:
rc = -ENOIOCTLCMD;
break;
}
return(rc);
}
/*****************************************************************************/
int __init stl_init(void)
{
printk(KERN_INFO "%s: version %sn", stl_drvtitle, stl_drvversion);
stl_initbrds();
/*
* Allocate a temporary write buffer.
*/
stl_tmpwritebuf = (char *) stl_memalloc(STL_TXBUFSIZE);
if (stl_tmpwritebuf == (char *) NULL)
printk("STALLION: failed to allocate memory (size=%d)n",
STL_TXBUFSIZE);
/*
* Set up a character driver for per board stuff. This is mainly used
* to do stats ioctls on the ports.
*/
if (devfs_register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
printk("STALLION: failed to register serial board devicen");
devfs_handle = devfs_mk_dir (NULL, "staliomem", NULL);
devfs_register_series (devfs_handle, "%u", 4, DEVFS_FL_DEFAULT,
STL_SIOMEMMAJOR, 0,
S_IFCHR | S_IRUSR | S_IWUSR,
&stl_fsiomem, NULL);
/*
* Set up the tty driver structure and register us as a driver.
* Also setup the callout tty device.
*/
memset(&stl_serial, 0, sizeof(struct tty_driver));
stl_serial.magic = TTY_DRIVER_MAGIC;
stl_serial.driver_name = stl_drvname;
stl_serial.name = stl_serialname;
stl_serial.major = STL_SERIALMAJOR;
stl_serial.minor_start = 0;
stl_serial.num = STL_MAXBRDS * STL_MAXPORTS;
stl_serial.type = TTY_DRIVER_TYPE_SERIAL;
stl_serial.subtype = STL_DRVTYPSERIAL;
stl_serial.init_termios = stl_deftermios;
stl_serial.flags = TTY_DRIVER_REAL_RAW;
stl_serial.refcount = &stl_refcount;
stl_serial.table = stl_ttys;
stl_serial.termios = stl_termios;
stl_serial.termios_locked = stl_termioslocked;
stl_serial.open = stl_open;
stl_serial.close = stl_close;
stl_serial.write = stl_write;
stl_serial.put_char = stl_putchar;
stl_serial.flush_chars = stl_flushchars;
stl_serial.write_room = stl_writeroom;
stl_serial.chars_in_buffer = stl_charsinbuffer;
stl_serial.ioctl = stl_ioctl;
stl_serial.set_termios = stl_settermios;
stl_serial.throttle = stl_throttle;
stl_serial.unthrottle = stl_unthrottle;
stl_serial.stop = stl_stop;
stl_serial.start = stl_start;
stl_serial.hangup = stl_hangup;
stl_serial.flush_buffer = stl_flushbuffer;
stl_serial.break_ctl = stl_breakctl;
stl_serial.wait_until_sent = stl_waituntilsent;
stl_serial.send_xchar = stl_sendxchar;
stl_serial.read_proc = stl_readproc;
stl_callout = stl_serial;
stl_callout.name = stl_calloutname;
stl_callout.major = STL_CALLOUTMAJOR;
stl_callout.subtype = STL_DRVTYPCALLOUT;
stl_callout.read_proc = 0;
if (tty_register_driver(&stl_serial))
printk("STALLION: failed to register serial drivern");
if (tty_register_driver(&stl_callout))
printk("STALLION: failed to register callout drivern");
return(0);
}
/*****************************************************************************/
/* CD1400 HARDWARE FUNCTIONS */
/*****************************************************************************/
/*
* These functions get/set/update the registers of the cd1400 UARTs.
* Access to the cd1400 registers is via an address/data io port pair.
* (Maybe should make this inline...)
*/
static int stl_cd1400getreg(stlport_t *portp, int regnr)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
return(inb(portp->ioaddr + EREG_DATA));
}
static void stl_cd1400setreg(stlport_t *portp, int regnr, int value)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
outb(value, portp->ioaddr + EREG_DATA);
}
static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
if (inb(portp->ioaddr + EREG_DATA) != value) {
outb(value, portp->ioaddr + EREG_DATA);
return(1);
}
return(0);
}
/*****************************************************************************/
/*
* Inbitialize the UARTs in a panel. We don't care what sort of board
* these ports are on - since the port io registers are almost
* identical when dealing with ports.
*/
static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
unsigned int gfrcr;
int chipmask, i, j;
int nrchips, uartaddr, ioaddr;
#if DEBUG
printk("stl_panelinit(brdp=%x,panelp=%x)n", (int) brdp, (int) panelp);
#endif
BRDENABLE(panelp->brdnr, panelp->pagenr);
/*
* Check that each chip is present and started up OK.
*/
chipmask = 0;
nrchips = panelp->nrports / CD1400_PORTS;
for (i = 0; (i < nrchips); i++) {
if (brdp->brdtype == BRD_ECHPCI) {
outb((panelp->pagenr + (i >> 1)), brdp->ioctrl);
ioaddr = panelp->iobase;
} else {
ioaddr = panelp->iobase + (EREG_BANKSIZE * (i >> 1));
}
uartaddr = (i & 0x01) ? 0x080 : 0;
outb((GFRCR + uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
outb((CCR + uartaddr), ioaddr);
outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
outb((GFRCR + uartaddr), ioaddr);
for (j = 0; (j < CCR_MAXWAIT); j++) {
if ((gfrcr = inb(ioaddr + EREG_DATA)) != 0)
break;
}
if ((j >= CCR_MAXWAIT) || (gfrcr < 0x40) || (gfrcr > 0x60)) {
printk("STALLION: cd1400 not responding, "
"brd=%d panel=%d chip=%dn",
panelp->brdnr, panelp->panelnr, i);
continue;
}
chipmask |= (0x1 << i);
outb((PPR + uartaddr), ioaddr);
outb(PPR_SCALAR, (ioaddr + EREG_DATA));
}
BRDDISABLE(panelp->brdnr);
return(chipmask);
}
/*****************************************************************************/
/*
* Initialize hardware specific port registers.
*/
static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
#if DEBUG
printk("stl_cd1400portinit(brdp=%x,panelp=%x,portp=%x)n",
(int) brdp, (int) panelp, (int) portp);
#endif
if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
(portp == (stlport_t *) NULL))
return;
portp->ioaddr = panelp->iobase + (((brdp->brdtype == BRD_ECHPCI) ||
(portp->portnr < 8)) ? 0 : EREG_BANKSIZE);
portp->uartaddr = (portp->portnr & 0x04) << 5;
portp->pagenr = panelp->pagenr + (portp->portnr >> 3);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, LIVR, (portp->portnr << 3));
portp->hwid = stl_cd1400getreg(portp, GFRCR);
BRDDISABLE(portp->brdnr);
}
/*****************************************************************************/
/*
* Wait for the command register to be ready. We will poll this,
* since it won't usually take too long to be ready.
*/
static void stl_cd1400ccrwait(stlport_t *portp)
{
int i;
for (i = 0; (i < CCR_MAXWAIT); i++) {
if (stl_cd1400getreg(portp, CCR) == 0) {
return;
}
}
printk("STALLION: cd1400 not responding, port=%d panel=%d brd=%dn",
portp->portnr, portp->panelnr, portp->brdnr);
}
/*****************************************************************************/
/*
* Set up the cd1400 registers for a port based on the termios port
* settings.
*/
static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp)
{
stlbrd_t *brdp;
unsigned long flags;
unsigned int clkdiv, baudrate;
unsigned char cor1, cor2, cor3;
unsigned char cor4, cor5, ccr;
unsigned char srer, sreron, sreroff;
unsigned char mcor1, mcor2, rtpr;
unsigned char clk, div;
cor1 = 0;
cor2 = 0;
cor3 = 0;
cor4 = 0;
cor5 = 0;
ccr = 0;
rtpr = 0;
clk = 0;
div = 0;
mcor1 = 0;
mcor2 = 0;
sreron = 0;
sreroff = 0;
brdp = stl_brds[portp->brdnr];
if (brdp == (stlbrd_t *) NULL)
return;
/*
* Set up the RX char ignore mask with those RX error types we
* can ignore. We can get the cd1400 to help us out a little here,
* it will ignore parity errors and breaks for us.
*/
portp->rxignoremsk = 0;
if (tiosp->c_iflag & IGNPAR) {
portp->rxignoremsk |= (ST_PARITY | ST_FRAMING | ST_OVERRUN);
cor1 |= COR1_PARIGNORE;
}
if (tiosp->c_iflag & IGNBRK) {
portp->rxignoremsk |= ST_BREAK;
cor4 |= COR4_IGNBRK;
}
portp->rxmarkmsk = ST_OVERRUN;
if (tiosp->c_iflag & (INPCK | PARMRK))
portp->rxmarkmsk |= (ST_PARITY | ST_FRAMING);
if (tiosp->c_iflag & BRKINT)
portp->rxmarkmsk |= ST_BREAK;
/*
* Go through the char size, parity and stop bits and set all the
* option register appropriately.
*/
switch (tiosp->c_cflag & CSIZE) {
case CS5:
cor1 |= COR1_CHL5;
break;
case CS6:
cor1 |= COR1_CHL6;
break;
case CS7:
cor1 |= COR1_CHL7;
break;
default:
cor1 |= COR1_CHL8;
break;
}
if (tiosp->c_cflag & CSTOPB)
cor1 |= COR1_STOP2;
else
cor1 |= COR1_STOP1;
if (tiosp->c_cflag & PARENB) {
if (tiosp->c_cflag & PARODD)
cor1 |= (COR1_PARENB | COR1_PARODD);
else
cor1 |= (COR1_PARENB | COR1_PAREVEN);
} else {
cor1 |= COR1_PARNONE;
}
/*
* Set the RX FIFO threshold at 6 chars. This gives a bit of breathing
* space for hardware flow control and the like. This should be set to
* VMIN. Also here we will set the RX data timeout to 10ms - this should
* really be based on VTIME.
*/
cor3 |= FIFO_RXTHRESHOLD;
rtpr = 2;
/*
* Calculate the baud rate timers. For now we will just assume that
* the input and output baud are the same. Could have used a baud
* table here, but this way we can generate virtually any baud rate
* we like!
*/
baudrate = tiosp->c_cflag & CBAUD;
if (baudrate & CBAUDEX) {
baudrate &= ~CBAUDEX;
if ((baudrate < 1) || (baudrate > 4))
tiosp->c_cflag &= ~CBAUDEX;
else
baudrate += 15;
}
baudrate = stl_baudrates[baudrate];
if ((tiosp->c_cflag & CBAUD) == B38400) {
if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
baudrate = (portp->baud_base / portp->custom_divisor);
}
if (baudrate > STL_CD1400MAXBAUD)
baudrate = STL_CD1400MAXBAUD;
if (baudrate > 0) {
for (clk = 0; (clk < CD1400_NUMCLKS); clk++) {
clkdiv = ((portp->clk / stl_cd1400clkdivs[clk]) / baudrate);
if (clkdiv < 0x100)
break;
}
div = (unsigned char) clkdiv;
}
/*
* Check what form of modem signaling is required and set it up.
*/
if ((tiosp->c_cflag & CLOCAL) == 0) {
mcor1 |= MCOR1_DCD;
mcor2 |= MCOR2_DCD;
sreron |= SRER_MODEM;
portp->flags |= ASYNC_CHECK_CD;
} else {
portp->flags &= ~ASYNC_CHECK_CD;
}
/*
* Setup cd1400 enhanced modes if we can. In particular we want to
* handle as much of the flow control as possible automatically. As
* well as saving a few CPU cycles it will also greatly improve flow
* control reliability.
*/
if (tiosp->c_iflag & IXON) {
cor2 |= COR2_TXIBE;
cor3 |= COR3_SCD12;
if (tiosp->c_iflag & IXANY)
cor2 |= COR2_IXM;
}
if (tiosp->c_cflag & CRTSCTS) {
cor2 |= COR2_CTSAE;
mcor1 |= FIFO_RTSTHRESHOLD;
}
/*
* All cd1400 register values calculated so go through and set
* them all up.
*/
#if DEBUG
printk("SETPORT: portnr=%d panelnr=%d brdnr=%dn",
portp->portnr, portp->panelnr, portp->brdnr);
printk(" cor1=%x cor2=%x cor3=%x cor4=%x cor5=%xn",
cor1, cor2, cor3, cor4, cor5);
printk(" mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%xn",
mcor1, mcor2, rtpr, sreron, sreroff);
printk(" tcor=%x tbpr=%x rcor=%x rbpr=%xn", clk, div, clk, div);
printk(" schr1=%x schr2=%x schr3=%x schr4=%xn",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x3));
srer = stl_cd1400getreg(portp, SRER);
stl_cd1400setreg(portp, SRER, 0);
if (stl_cd1400updatereg(portp, COR1, cor1))
ccr = 1;
if (stl_cd1400updatereg(portp, COR2, cor2))
ccr = 1;
if (stl_cd1400updatereg(portp, COR3, cor3))
ccr = 1;
if (ccr) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_CORCHANGE);
}
stl_cd1400setreg(portp, COR4, cor4);
stl_cd1400setreg(portp, COR5, cor5);
stl_cd1400setreg(portp, MCOR1, mcor1);
stl_cd1400setreg(portp, MCOR2, mcor2);
if (baudrate > 0) {
stl_cd1400setreg(portp, TCOR, clk);
stl_cd1400setreg(portp, TBPR, div);
stl_cd1400setreg(portp, RCOR, clk);
stl_cd1400setreg(portp, RBPR, div);
}
stl_cd1400setreg(portp, SCHR1, tiosp->c_cc[VSTART]);
stl_cd1400setreg(portp, SCHR2, tiosp->c_cc[VSTOP]);
stl_cd1400setreg(portp, SCHR3, tiosp->c_cc[VSTART]);
stl_cd1400setreg(portp, SCHR4, tiosp->c_cc[VSTOP]);
stl_cd1400setreg(portp, RTPR, rtpr);
mcor1 = stl_cd1400getreg(portp, MSVR1);
if (mcor1 & MSVR1_DCD)
portp->sigs |= TIOCM_CD;
else
portp->sigs &= ~TIOCM_CD;
stl_cd1400setreg(portp, SRER, ((srer & ~sreroff) | sreron));
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts)
{
unsigned char msvr1, msvr2;
unsigned long flags;
#if DEBUG
printk("stl_cd1400setsignals(portp=%x,dtr=%d,rts=%d)n",
(int) portp, dtr, rts);
#endif
msvr1 = 0;
msvr2 = 0;
if (dtr > 0)
msvr1 = MSVR1_DTR;
if (rts > 0)
msvr2 = MSVR2_RTS;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (rts >= 0)
stl_cd1400setreg(portp, MSVR2, msvr2);
if (dtr >= 0)
stl_cd1400setreg(portp, MSVR1, msvr1);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_cd1400getsignals(stlport_t *portp)
{
unsigned char msvr1, msvr2;
unsigned long flags;
int sigs;
#if DEBUG
printk("stl_cd1400getsignals(portp=%x)n", (int) portp);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
msvr1 = stl_cd1400getreg(portp, MSVR1);
msvr2 = stl_cd1400getreg(portp, MSVR2);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
sigs = 0;
sigs |= (msvr1 & MSVR1_DCD) ? TIOCM_CD : 0;
sigs |= (msvr1 & MSVR1_CTS) ? TIOCM_CTS : 0;
sigs |= (msvr1 & MSVR1_DTR) ? TIOCM_DTR : 0;
sigs |= (msvr2 & MSVR2_RTS) ? TIOCM_RTS : 0;
#if 0
sigs |= (msvr1 & MSVR1_RI) ? TIOCM_RI : 0;
sigs |= (msvr1 & MSVR1_DSR) ? TIOCM_DSR : 0;
#else
sigs |= TIOCM_DSR;
#endif
return(sigs);
}
/*****************************************************************************/
/*
* Enable/Disable the Transmitter and/or Receiver.
*/
static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
#if DEBUG
printk("stl_cd1400enablerxtx(portp=%x,rx=%d,tx=%d)n",
(int) portp, rx, tx);
#endif
ccr = 0;
if (tx == 0)
ccr |= CCR_TXDISABLE;
else if (tx > 0)
ccr |= CCR_TXENABLE;
if (rx == 0)
ccr |= CCR_RXDISABLE;
else if (rx > 0)
ccr |= CCR_RXENABLE;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, ccr);
stl_cd1400ccrwait(portp);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx)
{
unsigned char sreron, sreroff;
unsigned long flags;
#if DEBUG
printk("stl_cd1400startrxtx(portp=%x,rx=%d,tx=%d)n",
(int) portp, rx, tx);
#endif
sreron = 0;
sreroff = 0;
if (tx == 0)
sreroff |= (SRER_TXDATA | SRER_TXEMPTY);
else if (tx == 1)
sreron |= SRER_TXDATA;
else if (tx >= 2)
sreron |= SRER_TXEMPTY;
if (rx == 0)
sreroff |= SRER_RXDATA;
else if (rx > 0)
sreron |= SRER_RXDATA;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER,
((stl_cd1400getreg(portp, SRER) & ~sreroff) | sreron));
BRDDISABLE(portp->brdnr);
if (tx > 0)
set_bit(ASYI_TXBUSY, &portp->istate);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_cd1400disableintrs(stlport_t *portp)
{
unsigned long flags;
#if DEBUG
printk("stl_cd1400disableintrs(portp=%x)n", (int) portp);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER, 0);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
static void stl_cd1400sendbreak(stlport_t *portp, int len)
{
unsigned long flags;
#if DEBUG
printk("stl_cd1400sendbreak(portp=%x,len=%d)n", (int) portp, len);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER,
((stl_cd1400getreg(portp, SRER) & ~SRER_TXDATA) |
SRER_TXEMPTY));
BRDDISABLE(portp->brdnr);
portp->brklen = len;
if (len == 1)
portp->stats.txbreaks++;
restore_flags(flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_cd1400flowctrl(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
#if DEBUG
printk("stl_cd1400flowctrl(portp=%x,state=%x)n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (state) {
if (tty->termios->c_iflag & IXOFF) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
portp->stats.rxxon++;
stl_cd1400ccrwait(portp);
}
/*
* Question: should we return RTS to what it was before? It may
* have been set by an ioctl... Suppose not, since if you have
* hardware flow control set then it is pretty silly to go and
* set the RTS line by hand.
*/
if (tty->termios->c_cflag & CRTSCTS) {
stl_cd1400setreg(portp, MCOR1,
(stl_cd1400getreg(portp, MCOR1) |
FIFO_RTSTHRESHOLD));
stl_cd1400setreg(portp, MSVR2, MSVR2_RTS);
portp->stats.rxrtson++;
}
} else {
if (tty->termios->c_iflag & IXOFF) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
portp->stats.rxxoff++;
stl_cd1400ccrwait(portp);
}
if (tty->termios->c_cflag & CRTSCTS) {
stl_cd1400setreg(portp, MCOR1,
(stl_cd1400getreg(portp, MCOR1) & 0xf0));
stl_cd1400setreg(portp, MSVR2, 0);
portp->stats.rxrtsoff++;
}
}
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Send a flow control character...
*/
static void stl_cd1400sendflow(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
#if DEBUG
printk("stl_cd1400sendflow(portp=%x,state=%x)n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (state) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
portp->stats.rxxon++;
stl_cd1400ccrwait(portp);
} else {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
portp->stats.rxxoff++;
stl_cd1400ccrwait(portp);
}
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
static void stl_cd1400flush(stlport_t *portp)
{
unsigned long flags;
#if DEBUG
printk("stl_cd1400flush(portp=%x)n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_TXFLUSHFIFO);
stl_cd1400ccrwait(portp);
portp->tx.tail = portp->tx.head;
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Return the current state of data flow on this port. This is only
* really interresting when determining if data has fully completed
* transmission or not... This is easy for the cd1400, it accurately
* maintains the busy port flag.
*/
static int stl_cd1400datastate(stlport_t *portp)
{
#if DEBUG
printk("stl_cd1400datastate(portp=%x)n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return(0);
return(test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0);
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 EasyIO boards.
*/
static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase)
{
unsigned char svrtype;
#if DEBUG
printk("stl_cd1400eiointr(panelp=%x,iobase=%x)n",
(int) panelp, iobase);
#endif
outb(SVRR, iobase);
svrtype = inb(iobase + EREG_DATA);
if (panelp->nrports > 4) {
outb((SVRR + 0x80), iobase);
svrtype |= inb(iobase + EREG_DATA);
}
if (svrtype & SVRR_RX)
stl_cd1400rxisr(panelp, iobase);
else if (svrtype & SVRR_TX)
stl_cd1400txisr(panelp, iobase);
else if (svrtype & SVRR_MDM)
stl_cd1400mdmisr(panelp, iobase);
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 panels.
*/
static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase)
{
unsigned char svrtype;
#if DEBUG
printk("stl_cd1400echintr(panelp=%x,iobase=%x)n", (int) panelp,
iobase);
#endif
outb(SVRR, iobase);
svrtype = inb(iobase + EREG_DATA);
outb((SVRR + 0x80), iobase);
svrtype |= inb(iobase + EREG_DATA);
if (svrtype & SVRR_RX)
stl_cd1400rxisr(panelp, iobase);
else if (svrtype & SVRR_TX)
stl_cd1400txisr(panelp, iobase);
else if (svrtype & SVRR_MDM)
stl_cd1400mdmisr(panelp, iobase);
}
/*****************************************************************************/
/*
* Unfortunately we need to handle breaks in the TX data stream, since
* this is the only way to generate them on the cd1400.
*/
static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr)
{
if (portp->brklen == 1) {
outb((COR2 + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) | COR2_ETC),
(ioaddr + EREG_DATA));
outb((TDR + portp->uartaddr), ioaddr);
outb(ETC_CMD, (ioaddr + EREG_DATA));
outb(ETC_STARTBREAK, (ioaddr + EREG_DATA));
outb((SRER + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) & ~(SRER_TXDATA | SRER_TXEMPTY)),
(ioaddr + EREG_DATA));
return(1);
} else if (portp->brklen > 1) {
outb((TDR + portp->uartaddr), ioaddr);
outb(ETC_CMD, (ioaddr + EREG_DATA));
outb(ETC_STOPBREAK, (ioaddr + EREG_DATA));
portp->brklen = -1;
return(1);
} else {
outb((COR2 + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) & ~COR2_ETC),
(ioaddr + EREG_DATA));
portp->brklen = 0;
}
return(0);
}
/*****************************************************************************/
/*
* Transmit interrupt handler. This has gotta be fast! Handling TX
* chars is pretty simple, stuff as many as possible from the TX buffer
* into the cd1400 FIFO. Must also handle TX breaks here, since they
* are embedded as commands in the data stream. Oh no, had to use a goto!
* This could be optimized more, will do when I get time...
* In practice it is possible that interrupts are enabled but that the
* port has been hung up. Need to handle not having any TX buffer here,
* this is done by using the side effect that head and tail will also
* be NULL if the buffer has been freed.
*/
static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
int len, stlen;
char *head, *tail;
unsigned char ioack, srer;
#if DEBUG
printk("stl_cd1400txisr(panelp=%x,ioaddr=%x)n", (int) panelp, ioaddr);
#endif
ioack = inb(ioaddr + EREG_TXACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
printk("STALLION: bad TX interrupt ack value=%xn", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
/*
* Unfortunately we need to handle breaks in the data stream, since
* this is the only way to generate them on the cd1400. Do it now if
* a break is to be sent.
*/
if (portp->brklen != 0)
if (stl_cd1400breakisr(portp, ioaddr))
goto stl_txalldone;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
MOD_INC_USE_COUNT;
if (schedule_task(&portp->tqueue) == 0)
MOD_DEC_USE_COUNT;
}
if (len == 0) {
outb((SRER + portp->uartaddr), ioaddr);
srer = inb(ioaddr + EREG_DATA);
if (srer & SRER_TXDATA) {
srer = (srer & ~SRER_TXDATA) | SRER_TXEMPTY;
} else {
srer &= ~(SRER_TXDATA | SRER_TXEMPTY);
clear_bit(ASYI_TXBUSY, &portp->istate);
}
outb(srer, (ioaddr + EREG_DATA));
} else {
len = MIN(len, CD1400_TXFIFOSIZE);
portp->stats.txtotal += len;
stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
outb((TDR + portp->uartaddr), ioaddr);
outsb((ioaddr + EREG_DATA), tail, stlen);
len -= stlen;
tail += stlen;
if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
tail = portp->tx.buf;
if (len > 0) {
outsb((ioaddr + EREG_DATA), tail, len);
tail += len;
}
portp->tx.tail = tail;
}
stl_txalldone:
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/*
* Receive character interrupt handler. Determine if we have good chars
* or bad chars and then process appropriately. Good chars are easy
* just shove the lot into the RX buffer and set all status byte to 0.
* If a bad RX char then process as required. This routine needs to be
* fast! In practice it is possible that we get an interrupt on a port
* that is closed. This can happen on hangups - since they completely
* shutdown a port not in user context. Need to handle this case.
*/
static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
struct tty_struct *tty;
unsigned int ioack, len, buflen;
unsigned char status;
char ch;
#if DEBUG
printk("stl_cd1400rxisr(panelp=%x,ioaddr=%x)n", (int) panelp, ioaddr);
#endif
ioack = inb(ioaddr + EREG_RXACK);
if ((ioack & panelp->ackmask) != 0) {
printk("STALLION: bad RX interrupt ack value=%xn", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
tty = portp->tty;
if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
outb((RDCR + portp->uartaddr), ioaddr);
len = inb(ioaddr + EREG_DATA);
if ((tty == (struct tty_struct *) NULL) ||
(tty->flip.char_buf_ptr == (char *) NULL) ||
((buflen = TTY_FLIPBUF_SIZE - tty->flip.count) == 0)) {
len = MIN(len, sizeof(stl_unwanted));
outb((RDSR + portp->uartaddr), ioaddr);
insb((ioaddr + EREG_DATA), &stl_unwanted[0], len);
portp->stats.rxlost += len;
portp->stats.rxtotal += len;
} else {
len = MIN(len, buflen);
if (len > 0) {
outb((RDSR + portp->uartaddr), ioaddr);
insb((ioaddr + EREG_DATA), tty->flip.char_buf_ptr, len);
memset(tty->flip.flag_buf_ptr, 0, len);
tty->flip.flag_buf_ptr += len;
tty->flip.char_buf_ptr += len;
tty->flip.count += len;
tty_schedule_flip(tty);
portp->stats.rxtotal += len;
}
}
} else if ((ioack & ACK_TYPMASK) == ACK_TYPRXBAD) {
outb((RDSR + portp->uartaddr), ioaddr);
status = inb(ioaddr + EREG_DATA);
ch = inb(ioaddr + EREG_DATA);
if (status & ST_PARITY)
portp->stats.rxparity++;
if (status & ST_FRAMING)
portp->stats.rxframing++;
if (status & ST_OVERRUN)
portp->stats.rxoverrun++;
if (status & ST_BREAK)
portp->stats.rxbreaks++;
if (status & ST_SCHARMASK) {
if ((status & ST_SCHARMASK) == ST_SCHAR1)
portp->stats.txxon++;
if ((status & ST_SCHARMASK) == ST_SCHAR2)
portp->stats.txxoff++;
goto stl_rxalldone;
}
if ((tty != (struct tty_struct *) NULL) &&
((portp->rxignoremsk & status) == 0)) {
if (portp->rxmarkmsk & status) {
if (status & ST_BREAK) {
status = TTY_BREAK;
if (portp->flags & ASYNC_SAK) {
do_SAK(tty);
BRDENABLE(portp->brdnr, portp->pagenr);
}
} else if (status & ST_PARITY) {
status = TTY_PARITY;
} else if (status & ST_FRAMING) {
status = TTY_FRAME;
} else if(status & ST_OVERRUN) {
status = TTY_OVERRUN;
} else {
status = 0;
}
} else {
status = 0;
}
if (tty->flip.char_buf_ptr != (char *) NULL) {
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.flag_buf_ptr++ = status;
*tty->flip.char_buf_ptr++ = ch;
tty->flip.count++;
}
tty_schedule_flip(tty);
}
}
} else {
printk("STALLION: bad RX interrupt ack value=%xn", ioack);
return;
}
stl_rxalldone:
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/*
* Modem interrupt handler. The is called when the modem signal line
* (DCD) has changed state. Leave most of the work to the off-level
* processing routine.
*/
static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
unsigned int ioack;
unsigned char misr;
#if DEBUG
printk("stl_cd1400mdmisr(panelp=%x)n", (int) panelp);
#endif
ioack = inb(ioaddr + EREG_MDACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
printk("STALLION: bad MODEM interrupt ack value=%xn", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
outb((MISR + portp->uartaddr), ioaddr);
misr = inb(ioaddr + EREG_DATA);
if (misr & MISR_DCD) {
set_bit(ASYI_DCDCHANGE, &portp->istate);
MOD_INC_USE_COUNT;
if (schedule_task(&portp->tqueue) == 0)
MOD_DEC_USE_COUNT;
portp->stats.modem++;
}
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/* SC26198 HARDWARE FUNCTIONS */
/*****************************************************************************/
/*
* These functions get/set/update the registers of the sc26198 UARTs.
* Access to the sc26198 registers is via an address/data io port pair.
* (Maybe should make this inline...)
*/
static int stl_sc26198getreg(stlport_t *portp, int regnr)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
return(inb(portp->ioaddr + XP_DATA));
}
static void stl_sc26198setreg(stlport_t *portp, int regnr, int value)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
outb(value, (portp->ioaddr + XP_DATA));
}
static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
if (inb(portp->ioaddr + XP_DATA) != value) {
outb(value, (portp->ioaddr + XP_DATA));
return(1);
}
return(0);
}
/*****************************************************************************/
/*
* Functions to get and set the sc26198 global registers.
*/
static int stl_sc26198getglobreg(stlport_t *portp, int regnr)
{
outb(regnr, (portp->ioaddr + XP_ADDR));
return(inb(portp->ioaddr + XP_DATA));
}
#if 0
static void stl_sc26198setglobreg(stlport_t *portp, int regnr, int value)
{
outb(regnr, (portp->ioaddr + XP_ADDR));
outb(value, (portp->ioaddr + XP_DATA));
}
#endif
/*****************************************************************************/
/*
* Inbitialize the UARTs in a panel. We don't care what sort of board
* these ports are on - since the port io registers are almost
* identical when dealing with ports.
*/
static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
int chipmask, i;
int nrchips, ioaddr;
#if DEBUG
printk("stl_sc26198panelinit(brdp=%x,panelp=%x)n",
(int) brdp, (int) panelp);
#endif
BRDENABLE(panelp->brdnr, panelp->pagenr);
/*
* Check that each chip is present and started up OK.
*/
chipmask = 0;
nrchips = (panelp->nrports + 4) / SC26198_PORTS;
if (brdp->brdtype == BRD_ECHPCI)
outb(panelp->pagenr, brdp->ioctrl);
for (i = 0; (i < nrchips); i++) {
ioaddr = panelp->iobase + (i * 4);
outb(SCCR, (ioaddr + XP_ADDR));
outb(CR_RESETALL, (ioaddr + XP_DATA));
outb(TSTR, (ioaddr + XP_ADDR));
if (inb(ioaddr + XP_DATA) != 0) {
printk("STALLION: sc26198 not responding, "
"brd=%d panel=%d chip=%dn",
panelp->brdnr, panelp->panelnr, i);
continue;
}
chipmask |= (0x1 << i);
outb(GCCR, (ioaddr + XP_ADDR));
outb(GCCR_IVRTYPCHANACK, (ioaddr + XP_DATA));
outb(WDTRCR, (ioaddr + XP_ADDR));
outb(0xff, (ioaddr + XP_DATA));
}
BRDDISABLE(panelp->brdnr);
return(chipmask);
}
/*****************************************************************************/
/*
* Initialize hardware specific port registers.
*/
static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
#if DEBUG
printk("stl_sc26198portinit(brdp=%x,panelp=%x,portp=%x)n",
(int) brdp, (int) panelp, (int) portp);
#endif
if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
(portp == (stlport_t *) NULL))
return;
portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
portp->uartaddr = (portp->portnr & 0x07) << 4;
portp->pagenr = panelp->pagenr;
portp->hwid = 0x1;
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IOPCR, IOPCR_SETSIGS);
BRDDISABLE(portp->brdnr);
}
/*****************************************************************************/
/*
* Set up the sc26198 registers for a port based on the termios port
* settings.
*/
static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp)
{
stlbrd_t *brdp;
unsigned long flags;
unsigned int baudrate;
unsigned char mr0, mr1, mr2, clk;
unsigned char imron, imroff, iopr, ipr;
mr0 = 0;
mr1 = 0;
mr2 = 0;
clk = 0;
iopr = 0;
imron = 0;
imroff = 0;
brdp = stl_brds[portp->brdnr];
if (brdp == (stlbrd_t *) NULL)
return;
/*
* Set up the RX char ignore mask with those RX error types we
* can ignore.
*/
portp->rxignoremsk = 0;
if (tiosp->c_iflag & IGNPAR)
portp->rxignoremsk |= (SR_RXPARITY | SR_RXFRAMING |
SR_RXOVERRUN);
if (tiosp->c_iflag & IGNBRK)
portp->rxignoremsk |= SR_RXBREAK;
portp->rxmarkmsk = SR_RXOVERRUN;
if (tiosp->c_iflag & (INPCK | PARMRK))
portp->rxmarkmsk |= (SR_RXPARITY | SR_RXFRAMING);
if (tiosp->c_iflag & BRKINT)
portp->rxmarkmsk |= SR_RXBREAK;
/*
* Go through the char size, parity and stop bits and set all the
* option register appropriately.
*/
switch (tiosp->c_cflag & CSIZE) {
case CS5:
mr1 |= MR1_CS5;
break;
case CS6:
mr1 |= MR1_CS6;
break;
case CS7:
mr1 |= MR1_CS7;
break;
default:
mr1 |= MR1_CS8;
break;
}
if (tiosp->c_cflag & CSTOPB)
mr2 |= MR2_STOP2;
else
mr2 |= MR2_STOP1;
if (tiosp->c_cflag & PARENB) {
if (tiosp->c_cflag & PARODD)
mr1 |= (MR1_PARENB | MR1_PARODD);
else
mr1 |= (MR1_PARENB | MR1_PAREVEN);
} else {
mr1 |= MR1_PARNONE;
}
mr1 |= MR1_ERRBLOCK;
/*
* Set the RX FIFO threshold at 8 chars. This gives a bit of breathing
* space for hardware flow control and the like. This should be set to
* VMIN.
*/
mr2 |= MR2_RXFIFOHALF;
/*
* Calculate the baud rate timers. For now we will just assume that
* the input and output baud are the same. The sc26198 has a fixed
* baud rate table, so only discrete baud rates possible.
*/
baudrate = tiosp->c_cflag & CBAUD;
if (baudrate & CBAUDEX) {
baudrate &= ~CBAUDEX;
if ((baudrate < 1) || (baudrate > 4))
tiosp->c_cflag &= ~CBAUDEX;
else
baudrate += 15;
}
baudrate = stl_baudrates[baudrate];
if ((tiosp->c_cflag & CBAUD) == B38400) {
if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
baudrate = (portp->baud_base / portp->custom_divisor);
}
if (baudrate > STL_SC26198MAXBAUD)
baudrate = STL_SC26198MAXBAUD;
if (baudrate > 0) {
for (clk = 0; (clk < SC26198_NRBAUDS); clk++) {
if (baudrate <= sc26198_baudtable[clk])
break;
}
}
/*
* Check what form of modem signaling is required and set it up.
*/
if (tiosp->c_cflag & CLOCAL) {
portp->flags &= ~ASYNC_CHECK_CD;
} else {
iopr |= IOPR_DCDCOS;
imron |= IR_IOPORT;
portp->flags |= ASYNC_CHECK_CD;
}
/*
* Setup sc26198 enhanced modes if we can. In particular we want to
* handle as much of the flow control as possible automatically. As
* well as saving a few CPU cycles it will also greatly improve flow
* control reliability.
*/
if (tiosp->c_iflag & IXON) {
mr0 |= MR0_SWFTX | MR0_SWFT;
imron |= IR_XONXOFF;
} else {
imroff |= IR_XONXOFF;
}
if (tiosp->c_iflag & IXOFF)
mr0 |= MR0_SWFRX;
if (tiosp->c_cflag & CRTSCTS) {
mr2 |= MR2_AUTOCTS;
mr1 |= MR1_AUTORTS;
}
/*
* All sc26198 register values calculated so go through and set
* them all up.
*/
#if DEBUG
printk("SETPORT: portnr=%d panelnr=%d brdnr=%dn",
portp->portnr, portp->panelnr, portp->brdnr);
printk(" mr0=%x mr1=%x mr2=%x clk=%xn", mr0, mr1, mr2, clk);
printk(" iopr=%x imron=%x imroff=%xn", iopr, imron, imroff);
printk(" schr1=%x schr2=%x schr3=%x schr4=%xn",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IMR, 0);
stl_sc26198updatereg(portp, MR0, mr0);
stl_sc26198updatereg(portp, MR1, mr1);
stl_sc26198setreg(portp, SCCR, CR_RXERRBLOCK);
stl_sc26198updatereg(portp, MR2, mr2);
stl_sc26198updatereg(portp, IOPIOR,
((stl_sc26198getreg(portp, IOPIOR) & ~IPR_CHANGEMASK) | iopr));
if (baudrate > 0) {
stl_sc26198setreg(portp, TXCSR, clk);
stl_sc26198setreg(portp, RXCSR, clk);
}
stl_sc26198setreg(portp, XONCR, tiosp->c_cc[VSTART]);
stl_sc26198setreg(portp, XOFFCR, tiosp->c_cc[VSTOP]);
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCD)
portp->sigs &= ~TIOCM_CD;
else
portp->sigs |= TIOCM_CD;
portp->imr = (portp->imr & ~imroff) | imron;
stl_sc26198setreg(portp, IMR, portp->imr);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts)
{
unsigned char iopioron, iopioroff;
unsigned long flags;
#if DEBUG
printk("stl_sc26198setsignals(portp=%x,dtr=%d,rts=%d)n",
(int) portp, dtr, rts);
#endif
iopioron = 0;
iopioroff = 0;
if (dtr == 0)
iopioroff |= IPR_DTR;
else if (dtr > 0)
iopioron |= IPR_DTR;
if (rts == 0)
iopioroff |= IPR_RTS;
else if (rts > 0)
iopioron |= IPR_RTS;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IOPIOR,
((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_sc26198getsignals(stlport_t *portp)
{
unsigned char ipr;
unsigned long flags;
int sigs;
#if DEBUG
printk("stl_sc26198getsignals(portp=%x)n", (int) portp);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
ipr = stl_sc26198getreg(portp, IPR);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
sigs = 0;
sigs |= (ipr & IPR_DCD) ? 0 : TIOCM_CD;
sigs |= (ipr & IPR_CTS) ? 0 : TIOCM_CTS;
sigs |= (ipr & IPR_DTR) ? 0: TIOCM_DTR;
sigs |= (ipr & IPR_RTS) ? 0: TIOCM_RTS;
sigs |= TIOCM_DSR;
return(sigs);
}
/*****************************************************************************/
/*
* Enable/Disable the Transmitter and/or Receiver.
*/
static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
#if DEBUG
printk("stl_sc26198enablerxtx(portp=%x,rx=%d,tx=%d)n",
(int) portp, rx, tx);
#endif
ccr = portp->crenable;
if (tx == 0)
ccr &= ~CR_TXENABLE;
else if (tx > 0)
ccr |= CR_TXENABLE;
if (rx == 0)
ccr &= ~CR_RXENABLE;
else if (rx > 0)
ccr |= CR_RXENABLE;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, SCCR, ccr);
BRDDISABLE(portp->brdnr);
portp->crenable = ccr;
restore_flags(flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx)
{
unsigned char imr;
unsigned long flags;
#if DEBUG
printk("stl_sc26198startrxtx(portp=%x,rx=%d,tx=%d)n",
(int) portp, rx, tx);
#endif
imr = portp->imr;
if (tx == 0)
imr &= ~IR_TXRDY;
else if (tx == 1)
imr |= IR_TXRDY;
if (rx == 0)
imr &= ~(IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG);
else if (rx > 0)
imr |= IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IMR, imr);
BRDDISABLE(portp->brdnr);
portp->imr = imr;
if (tx > 0)
set_bit(ASYI_TXBUSY, &portp->istate);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_sc26198disableintrs(stlport_t *portp)
{
unsigned long flags;
#if DEBUG
printk("stl_sc26198disableintrs(portp=%x)n", (int) portp);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
portp->imr = 0;
stl_sc26198setreg(portp, IMR, 0);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
static void stl_sc26198sendbreak(stlport_t *portp, int len)
{
unsigned long flags;
#if DEBUG
printk("stl_sc26198sendbreak(portp=%x,len=%d)n", (int) portp, len);
#endif
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
if (len == 1) {
stl_sc26198setreg(portp, SCCR, CR_TXSTARTBREAK);
portp->stats.txbreaks++;
} else {
stl_sc26198setreg(portp, SCCR, CR_TXSTOPBREAK);
}
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_sc26198flowctrl(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
#if DEBUG
printk("stl_sc26198flowctrl(portp=%x,state=%x)n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
if (state) {
if (tty->termios->c_iflag & IXOFF) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
mr0 |= MR0_SWFRX;
portp->stats.rxxon++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
/*
* Question: should we return RTS to what it was before? It may
* have been set by an ioctl... Suppose not, since if you have
* hardware flow control set then it is pretty silly to go and
* set the RTS line by hand.
*/
if (tty->termios->c_cflag & CRTSCTS) {
stl_sc26198setreg(portp, MR1,
(stl_sc26198getreg(portp, MR1) | MR1_AUTORTS));
stl_sc26198setreg(portp, IOPIOR,
(stl_sc26198getreg(portp, IOPIOR) | IOPR_RTS));
portp->stats.rxrtson++;
}
} else {
if (tty->termios->c_iflag & IXOFF) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
mr0 &= ~MR0_SWFRX;
portp->stats.rxxoff++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
if (tty->termios->c_cflag & CRTSCTS) {
stl_sc26198setreg(portp, MR1,
(stl_sc26198getreg(portp, MR1) & ~MR1_AUTORTS));
stl_sc26198setreg(portp, IOPIOR,
(stl_sc26198getreg(portp, IOPIOR) & ~IOPR_RTS));
portp->stats.rxrtsoff++;
}
}
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
/*
* Send a flow control character.
*/
static void stl_sc26198sendflow(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
#if DEBUG
printk("stl_sc26198sendflow(portp=%x,state=%x)n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
if (state) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
mr0 |= MR0_SWFRX;
portp->stats.rxxon++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
} else {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
mr0 &= ~MR0_SWFRX;
portp->stats.rxxoff++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
BRDDISABLE(portp->brdnr);
restore_flags(flags);
}
/*****************************************************************************/
static void stl_sc26198flush(stlport_t *portp)
{
unsigned long flags;
#if DEBUG
printk("stl_sc26198flush(portp=%x)n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, SCCR, CR_TXRESET);
stl_sc26198setreg(portp, SCCR, portp->crenable);
BRDDISABLE(portp->brdnr);
portp->tx.tail = portp->tx.head;
restore_flags(flags);
}
/*****************************************************************************/
/*
* Return the current state of data flow on this port. This is only
* really interresting when determining if data has fully completed
* transmission or not... The sc26198 interrupt scheme cannot
* determine when all data has actually drained, so we need to
* check the port statusy register to be sure.
*/
static int stl_sc26198datastate(stlport_t *portp)
{
unsigned long flags;
unsigned char sr;
#if DEBUG
printk("stl_sc26198datastate(portp=%x)n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return(0);
if (test_bit(ASYI_TXBUSY, &portp->istate))
return(1);
save_flags(flags);
cli();
BRDENABLE(portp->brdnr, portp->pagenr);
sr = stl_sc26198getreg(portp, SR);
BRDDISABLE(portp->brdnr);
restore_flags(flags);
return((sr & SR_TXEMPTY) ? 0 : 1);
}
/*****************************************************************************/
/*
* Delay for a small amount of time, to give the sc26198 a chance
* to process a command...
*/
static void stl_sc26198wait(stlport_t *portp)
{
int i;
#if DEBUG
printk("stl_sc26198wait(portp=%x)n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
for (i = 0; (i < 20); i++)
stl_sc26198getglobreg(portp, TSTR);
}
/*****************************************************************************/
/*
* If we are TX flow controlled and in IXANY mode then we may
* need to unflow control here. We gotta do this because of the
* automatic flow control modes of the sc26198.
*/
static inline void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty)
{
unsigned char mr0;
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_HOSTXON);
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
clear_bit(ASYI_TXFLOWED, &portp->istate);
}
/*****************************************************************************/
/*
* Interrupt service routine for sc26198 panels.
*/
static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase)
{
stlport_t *portp;
unsigned int iack;
/*
* Work around bug in sc26198 chip... Cannot have A6 address
* line of UART high, else iack will be returned as 0.
*/
outb(0, (iobase + 1));
iack = inb(iobase + XP_IACK);
portp = panelp->ports[(iack & IVR_CHANMASK) + ((iobase & 0x4) << 1)];
if (iack & IVR_RXDATA)
stl_sc26198rxisr(portp, iack);
else if (iack & IVR_TXDATA)
stl_sc26198txisr(portp);
else
stl_sc26198otherisr(portp, iack);
}
/*****************************************************************************/
/*
* Transmit interrupt handler. This has gotta be fast! Handling TX
* chars is pretty simple, stuff as many as possible from the TX buffer
* into the sc26198 FIFO.
* In practice it is possible that interrupts are enabled but that the
* port has been hung up. Need to handle not having any TX buffer here,
* this is done by using the side effect that head and tail will also
* be NULL if the buffer has been freed.
*/
static void stl_sc26198txisr(stlport_t *portp)
{
unsigned int ioaddr;
unsigned char mr0;
int len, stlen;
char *head, *tail;
#if DEBUG
printk("stl_sc26198txisr(portp=%x)n", (int) portp);
#endif
ioaddr = portp->ioaddr;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
MOD_INC_USE_COUNT;
if (schedule_task(&portp->tqueue) == 0)
MOD_DEC_USE_COUNT;
}
if (len == 0) {
outb((MR0 | portp->uartaddr), (ioaddr + XP_ADDR));
mr0 = inb(ioaddr + XP_DATA);
if ((mr0 & MR0_TXMASK) == MR0_TXEMPTY) {
portp->imr &= ~IR_TXRDY;
outb((IMR | portp->uartaddr), (ioaddr + XP_ADDR));
outb(portp->imr, (ioaddr + XP_DATA));
clear_bit(ASYI_TXBUSY, &portp->istate);
} else {
mr0 |= ((mr0 & ~MR0_TXMASK) | MR0_TXEMPTY);
outb(mr0, (ioaddr + XP_DATA));
}
} else {
len = MIN(len, SC26198_TXFIFOSIZE);
portp->stats.txtotal += len;
stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
outb(GTXFIFO, (ioaddr + XP_ADDR));
outsb((ioaddr + XP_DATA), tail, stlen);
len -= stlen;
tail += stlen;
if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
tail = portp->tx.buf;
if (len > 0) {
outsb((ioaddr + XP_DATA), tail, len);
tail += len;
}
portp->tx.tail = tail;
}
}
/*****************************************************************************/
/*
* Receive character interrupt handler. Determine if we have good chars
* or bad chars and then process appropriately. Good chars are easy
* just shove the lot into the RX buffer and set all status byte to 0.
* If a bad RX char then process as required. This routine needs to be
* fast! In practice it is possible that we get an interrupt on a port
* that is closed. This can happen on hangups - since they completely
* shutdown a port not in user context. Need to handle this case.
*/
static void stl_sc26198rxisr(stlport_t *portp, unsigned int iack)
{
struct tty_struct *tty;
unsigned int len, buflen, ioaddr;
#if DEBUG
printk("stl_sc26198rxisr(portp=%x,iack=%x)n", (int) portp, iack);
#endif
tty = portp->tty;
ioaddr = portp->ioaddr;
outb(GIBCR, (ioaddr + XP_ADDR));
len = inb(ioaddr + XP_DATA) + 1;
if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
if ((tty == (struct tty_struct *) NULL) ||
(tty->flip.char_buf_ptr == (char *) NULL) ||
((buflen = TTY_FLIPBUF_SIZE - tty->flip.count) == 0)) {
len = MIN(len, sizeof(stl_unwanted));
outb(GRXFIFO, (ioaddr + XP_ADDR));
insb((ioaddr + XP_DATA), &stl_unwanted[0], len);
portp->stats.rxlost += len;
portp->stats.rxtotal += len;
} else {
len = MIN(len, buflen);
if (len > 0) {
outb(GRXFIFO, (ioaddr + XP_ADDR));
insb((ioaddr + XP_DATA), tty->flip.char_buf_ptr, len);
memset(tty->flip.flag_buf_ptr, 0, len);
tty->flip.flag_buf_ptr += len;
tty->flip.char_buf_ptr += len;
tty->flip.count += len;
tty_schedule_flip(tty);
portp->stats.rxtotal += len;
}
}
} else {
stl_sc26198rxbadchars(portp);
}
/*
* If we are TX flow controlled and in IXANY mode then we may need
* to unflow control here. We gotta do this because of the automatic
* flow control modes of the sc26198.
*/
if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
if ((tty != (struct tty_struct *) NULL) &&
(tty->termios != (struct termios *) NULL) &&
(tty->termios->c_iflag & IXANY)) {
stl_sc26198txunflow(portp, tty);
}
}
}
/*****************************************************************************/
/*
* Process an RX bad character.
*/
static void inline stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch)
{
struct tty_struct *tty;
unsigned int ioaddr;
tty = portp->tty;
ioaddr = portp->ioaddr;
if (status & SR_RXPARITY)
portp->stats.rxparity++;
if (status & SR_RXFRAMING)
portp->stats.rxframing++;
if (status & SR_RXOVERRUN)
portp->stats.rxoverrun++;
if (status & SR_RXBREAK)
portp->stats.rxbreaks++;
if ((tty != (struct tty_struct *) NULL) &&
((portp->rxignoremsk & status) == 0)) {
if (portp->rxmarkmsk & status) {
if (status & SR_RXBREAK) {
status = TTY_BREAK;
if (portp->flags & ASYNC_SAK) {
do_SAK(tty);
BRDENABLE(portp->brdnr, portp->pagenr);
}
} else if (status & SR_RXPARITY) {
status = TTY_PARITY;
} else if (status & SR_RXFRAMING) {
status = TTY_FRAME;
} else if(status & SR_RXOVERRUN) {
status = TTY_OVERRUN;
} else {
status = 0;
}
} else {
status = 0;
}
if (tty->flip.char_buf_ptr != (char *) NULL) {
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.flag_buf_ptr++ = status;
*tty->flip.char_buf_ptr++ = ch;
tty->flip.count++;
}
tty_schedule_flip(tty);
}
if (status == 0)
portp->stats.rxtotal++;
}
}
/*****************************************************************************/
/*
* Process all characters in the RX FIFO of the UART. Check all char
* status bytes as well, and process as required. We need to check
* all bytes in the FIFO, in case some more enter the FIFO while we
* are here. To get the exact character error type we need to switch
* into CHAR error mode (that is why we need to make sure we empty
* the FIFO).
*/
static void stl_sc26198rxbadchars(stlport_t *portp)
{
unsigned char status, mr1;
char ch;
/*
* To get the precise error type for each character we must switch
* back into CHAR error mode.
*/
mr1 = stl_sc26198getreg(portp, MR1);
stl_sc26198setreg(portp, MR1, (mr1 & ~MR1_ERRBLOCK));
while ((status = stl_sc26198getreg(portp, SR)) & SR_RXRDY) {
stl_sc26198setreg(portp, SCCR, CR_CLEARRXERR);
ch = stl_sc26198getreg(portp, RXFIFO);
stl_sc26198rxbadch(portp, status, ch);
}
/*
* To get correct interrupt class we must switch back into BLOCK
* error mode.
*/
stl_sc26198setreg(portp, MR1, mr1);
}
/*****************************************************************************/
/*
* Other interrupt handler. This includes modem signals, flow
* control actions, etc. Most stuff is left to off-level interrupt
* processing time.
*/
static void stl_sc26198otherisr(stlport_t *portp, unsigned int iack)
{
unsigned char cir, ipr, xisr;
#if DEBUG
printk("stl_sc26198otherisr(portp=%x,iack=%x)n", (int) portp, iack);
#endif
cir = stl_sc26198getglobreg(portp, CIR);
switch (cir & CIR_SUBTYPEMASK) {
case CIR_SUBCOS:
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCDCHANGE) {
set_bit(ASYI_DCDCHANGE, &portp->istate);
MOD_INC_USE_COUNT;
if (schedule_task(&portp->tqueue) == 0)
MOD_DEC_USE_COUNT;
portp->stats.modem++;
}
break;
case CIR_SUBXONXOFF:
xisr = stl_sc26198getreg(portp, XISR);
if (xisr & XISR_RXXONGOT) {
set_bit(ASYI_TXFLOWED, &portp->istate);
portp->stats.txxoff++;
}
if (xisr & XISR_RXXOFFGOT) {
clear_bit(ASYI_TXFLOWED, &portp->istate);
portp->stats.txxon++;
}
break;
case CIR_SUBBREAK:
stl_sc26198setreg(portp, SCCR, CR_BREAKRESET);
stl_sc26198rxbadchars(portp);
break;
default:
break;
}
}
/*****************************************************************************/