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linux/drivers/char/stallion.c
Alan Cox fcc8ac1825 tty: Add carrier processing on close to the tty_port core 
Some drivers implement this internally, others miss it out. Push the
behaviour into the core code as that way everyone will do it consistently.

Update the dtr rts method to raise or lower depending upon flags. Having a
single method in this style fits most of the implementations more cleanly than
two funtions.

We need this in place before we tackle the USB side

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-11 08:50:56 -07:00

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/*****************************************************************************/
/*
* stallion.c -- stallion multiport serial driver.
*
* Copyright (C) 1996-1999 Stallion Technologies
* Copyright (C) 1994-1996 Greg Ungerer.
*
* This code is loosely based on the Linux serial driver, written by
* Linus Torvalds, Theodore T'so and others.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*****************************************************************************/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/seq_file.h>
#include <linux/cd1400.h>
#include <linux/sc26198.h>
#include <linux/comstats.h>
#include <linux/stallion.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/pci.h>
/*****************************************************************************/
/*
* Define different board types. Use the standard Stallion "assigned"
* board numbers. Boards supported in this driver are abbreviated as
* EIO = EasyIO and ECH = EasyConnection 8/32.
*/
#define BRD_EASYIO 20
#define BRD_ECH 21
#define BRD_ECHMC 22
#define BRD_ECHPCI 26
#define BRD_ECH64PCI 27
#define BRD_EASYIOPCI 28
struct stlconf {
unsigned int brdtype;
int ioaddr1;
int ioaddr2;
unsigned long memaddr;
int irq;
int irqtype;
};
static unsigned int stl_nrbrds;
/*****************************************************************************/
/*
* Define some important driver characteristics. Device major numbers
* allocated as per Linux Device Registry.
*/
#ifndef STL_SIOMEMMAJOR
#define STL_SIOMEMMAJOR 28
#endif
#ifndef STL_SERIALMAJOR
#define STL_SERIALMAJOR 24
#endif
#ifndef STL_CALLOUTMAJOR
#define STL_CALLOUTMAJOR 25
#endif
/*
* Set the TX buffer size. Bigger is better, but we don't want
* to chew too much memory with buffers!
*/
#define STL_TXBUFLOW 512
#define STL_TXBUFSIZE 4096
/*****************************************************************************/
/*
* Define our local driver identity first. Set up stuff to deal with
* all the local structures required by a serial tty driver.
*/
static char *stl_drvtitle = "Stallion Multiport Serial Driver";
static char *stl_drvname = "stallion";
static char *stl_drvversion = "5.6.0";
static struct tty_driver *stl_serial;
/*
* Define a local default termios struct. All ports will be created
* with this termios initially. Basically all it defines is a raw port
* at 9600, 8 data bits, 1 stop bit.
*/
static struct ktermios stl_deftermios = {
.c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
.c_cc = INIT_C_CC,
.c_ispeed = 9600,
.c_ospeed = 9600,
};
/*
* Define global place to put buffer overflow characters.
*/
static char stl_unwanted[SC26198_RXFIFOSIZE];
/*****************************************************************************/
static DEFINE_MUTEX(stl_brdslock);
static struct stlbrd *stl_brds[STL_MAXBRDS];
static const struct tty_port_operations stl_port_ops;
/*
* Per board state flags. Used with the state field of the board struct.
* Not really much here!
*/
#define BRD_FOUND 0x1
#define STL_PROBED 0x2
/*
* Define the port structure istate flags. These set of flags are
* modified at interrupt time - so setting and reseting them needs
* to be atomic. Use the bit clear/setting routines for this.
*/
#define ASYI_TXBUSY 1
#define ASYI_TXLOW 2
#define ASYI_TXFLOWED 3
/*
* Define an array of board names as printable strings. Handy for
* referencing boards when printing trace and stuff.
*/
static char *stl_brdnames[] = {
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
"EasyIO",
"EC8/32-AT",
"EC8/32-MC",
NULL,
NULL,
NULL,
"EC8/32-PCI",
"EC8/64-PCI",
"EasyIO-PCI",
};
/*****************************************************************************/
/*
* Define some string labels for arguments passed from the module
* load line. These allow for easy board definitions, and easy
* modification of the io, memory and irq resoucres.
*/
static unsigned int stl_nargs;
static char *board0[4];
static char *board1[4];
static char *board2[4];
static char *board3[4];
static char **stl_brdsp[] = {
(char **) &board0,
(char **) &board1,
(char **) &board2,
(char **) &board3
};
/*
* Define a set of common board names, and types. This is used to
* parse any module arguments.
*/
static struct {
char *name;
int type;
} stl_brdstr[] = {
{ "easyio", BRD_EASYIO },
{ "eio", BRD_EASYIO },
{ "20", BRD_EASYIO },
{ "ec8/32", BRD_ECH },
{ "ec8/32-at", BRD_ECH },
{ "ec8/32-isa", BRD_ECH },
{ "ech", BRD_ECH },
{ "echat", BRD_ECH },
{ "21", BRD_ECH },
{ "ec8/32-mc", BRD_ECHMC },
{ "ec8/32-mca", BRD_ECHMC },
{ "echmc", BRD_ECHMC },
{ "echmca", BRD_ECHMC },
{ "22", BRD_ECHMC },
{ "ec8/32-pc", BRD_ECHPCI },
{ "ec8/32-pci", BRD_ECHPCI },
{ "26", BRD_ECHPCI },
{ "ec8/64-pc", BRD_ECH64PCI },
{ "ec8/64-pci", BRD_ECH64PCI },
{ "ech-pci", BRD_ECH64PCI },
{ "echpci", BRD_ECH64PCI },
{ "echpc", BRD_ECH64PCI },
{ "27", BRD_ECH64PCI },
{ "easyio-pc", BRD_EASYIOPCI },
{ "easyio-pci", BRD_EASYIOPCI },
{ "eio-pci", BRD_EASYIOPCI },
{ "eiopci", BRD_EASYIOPCI },
{ "28", BRD_EASYIOPCI },
};
/*
* Define the module agruments.
*/
module_param_array(board0, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board1, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board2, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board3, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,ioaddr2][,irq]]");
/*****************************************************************************/
/*
* Hardware ID bits for the EasyIO and ECH boards. These defines apply
* to the directly accessible io ports of these boards (not the uarts -
* they are in cd1400.h and sc26198.h).
*/
#define EIO_8PORTRS 0x04
#define EIO_4PORTRS 0x05
#define EIO_8PORTDI 0x00
#define EIO_8PORTM 0x06
#define EIO_MK3 0x03
#define EIO_IDBITMASK 0x07
#define EIO_BRDMASK 0xf0
#define ID_BRD4 0x10
#define ID_BRD8 0x20
#define ID_BRD16 0x30
#define EIO_INTRPEND 0x08
#define EIO_INTEDGE 0x00
#define EIO_INTLEVEL 0x08
#define EIO_0WS 0x10
#define ECH_ID 0xa0
#define ECH_IDBITMASK 0xe0
#define ECH_BRDENABLE 0x08
#define ECH_BRDDISABLE 0x00
#define ECH_INTENABLE 0x01
#define ECH_INTDISABLE 0x00
#define ECH_INTLEVEL 0x02
#define ECH_INTEDGE 0x00
#define ECH_INTRPEND 0x01
#define ECH_BRDRESET 0x01
#define ECHMC_INTENABLE 0x01
#define ECHMC_BRDRESET 0x02
#define ECH_PNLSTATUS 2
#define ECH_PNL16PORT 0x20
#define ECH_PNLIDMASK 0x07
#define ECH_PNLXPID 0x40
#define ECH_PNLINTRPEND 0x80
#define ECH_ADDR2MASK 0x1e0
/*
* Define the vector mapping bits for the programmable interrupt board
* hardware. These bits encode the interrupt for the board to use - it
* is software selectable (except the EIO-8M).
*/
static unsigned char stl_vecmap[] = {
0xff, 0xff, 0xff, 0x04, 0x06, 0x05, 0xff, 0x07,
0xff, 0xff, 0x00, 0x02, 0x01, 0xff, 0xff, 0x03
};
/*
* Lock ordering is that you may not take stallion_lock holding
* brd_lock.
*/
static spinlock_t brd_lock; /* Guard the board mapping */
static spinlock_t stallion_lock; /* Guard the tty driver */
/*
* Set up enable and disable macros for the ECH boards. They require
* the secondary io address space to be activated and deactivated.
* This way all ECH boards can share their secondary io region.
* If this is an ECH-PCI board then also need to set the page pointer
* to point to the correct page.
*/
#define BRDENABLE(brdnr,pagenr) \
if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDENABLE), \
stl_brds[(brdnr)]->ioctrl); \
else if (stl_brds[(brdnr)]->brdtype == BRD_ECHPCI) \
outb((pagenr), stl_brds[(brdnr)]->ioctrl);
#define BRDDISABLE(brdnr) \
if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDDISABLE), \
stl_brds[(brdnr)]->ioctrl);
#define STL_CD1400MAXBAUD 230400
#define STL_SC26198MAXBAUD 460800
#define STL_BAUDBASE 115200
#define STL_CLOSEDELAY (5 * HZ / 10)
/*****************************************************************************/
/*
* Define the Stallion PCI vendor and device IDs.
*/
#ifndef PCI_VENDOR_ID_STALLION
#define PCI_VENDOR_ID_STALLION 0x124d
#endif
#ifndef PCI_DEVICE_ID_ECHPCI832
#define PCI_DEVICE_ID_ECHPCI832 0x0000
#endif
#ifndef PCI_DEVICE_ID_ECHPCI864
#define PCI_DEVICE_ID_ECHPCI864 0x0002
#endif
#ifndef PCI_DEVICE_ID_EIOPCI
#define PCI_DEVICE_ID_EIOPCI 0x0003
#endif
/*
* Define structure to hold all Stallion PCI boards.
*/
static struct pci_device_id stl_pcibrds[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI864),
.driver_data = BRD_ECH64PCI },
{ PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_EIOPCI),
.driver_data = BRD_EASYIOPCI },
{ PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI832),
.driver_data = BRD_ECHPCI },
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410),
.driver_data = BRD_ECHPCI },
{ }
};
MODULE_DEVICE_TABLE(pci, stl_pcibrds);
/*****************************************************************************/
/*
* Define macros to extract a brd/port number from a minor number.
*/
#define MINOR2BRD(min) (((min) & 0xc0) >> 6)
#define MINOR2PORT(min) ((min) & 0x3f)
/*
* Define a baud rate table that converts termios baud rate selector
* into the actual baud rate value. All baud rate calculations are
* based on the actual baud rate required.
*/
static unsigned int stl_baudrates[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};
/*****************************************************************************/
/*
* Declare all those functions in this driver!
*/
static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
static int stl_brdinit(struct stlbrd *brdp);
static int stl_getportstats(struct tty_struct *tty, struct stlport *portp, comstats_t __user *cp);
static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp);
/*
* CD1400 uart specific handling functions.
*/
static void stl_cd1400setreg(struct stlport *portp, int regnr, int value);
static int stl_cd1400getreg(struct stlport *portp, int regnr);
static int stl_cd1400updatereg(struct stlport *portp, int regnr, int value);
static int stl_cd1400panelinit(struct stlbrd *brdp, struct stlpanel *panelp);
static void stl_cd1400portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
static void stl_cd1400setport(struct stlport *portp, struct ktermios *tiosp);
static int stl_cd1400getsignals(struct stlport *portp);
static void stl_cd1400setsignals(struct stlport *portp, int dtr, int rts);
static void stl_cd1400ccrwait(struct stlport *portp);
static void stl_cd1400enablerxtx(struct stlport *portp, int rx, int tx);
static void stl_cd1400startrxtx(struct stlport *portp, int rx, int tx);
static void stl_cd1400disableintrs(struct stlport *portp);
static void stl_cd1400sendbreak(struct stlport *portp, int len);
static void stl_cd1400flowctrl(struct stlport *portp, int state);
static void stl_cd1400sendflow(struct stlport *portp, int state);
static void stl_cd1400flush(struct stlport *portp);
static int stl_cd1400datastate(struct stlport *portp);
static void stl_cd1400eiointr(struct stlpanel *panelp, unsigned int iobase);
static void stl_cd1400echintr(struct stlpanel *panelp, unsigned int iobase);
static void stl_cd1400txisr(struct stlpanel *panelp, int ioaddr);
static void stl_cd1400rxisr(struct stlpanel *panelp, int ioaddr);
static void stl_cd1400mdmisr(struct stlpanel *panelp, int ioaddr);
static inline int stl_cd1400breakisr(struct stlport *portp, int ioaddr);
/*
* SC26198 uart specific handling functions.
*/
static void stl_sc26198setreg(struct stlport *portp, int regnr, int value);
static int stl_sc26198getreg(struct stlport *portp, int regnr);
static int stl_sc26198updatereg(struct stlport *portp, int regnr, int value);
static int stl_sc26198getglobreg(struct stlport *portp, int regnr);
static int stl_sc26198panelinit(struct stlbrd *brdp, struct stlpanel *panelp);
static void stl_sc26198portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
static void stl_sc26198setport(struct stlport *portp, struct ktermios *tiosp);
static int stl_sc26198getsignals(struct stlport *portp);
static void stl_sc26198setsignals(struct stlport *portp, int dtr, int rts);
static void stl_sc26198enablerxtx(struct stlport *portp, int rx, int tx);
static void stl_sc26198startrxtx(struct stlport *portp, int rx, int tx);
static void stl_sc26198disableintrs(struct stlport *portp);
static void stl_sc26198sendbreak(struct stlport *portp, int len);
static void stl_sc26198flowctrl(struct stlport *portp, int state);
static void stl_sc26198sendflow(struct stlport *portp, int state);
static void stl_sc26198flush(struct stlport *portp);
static int stl_sc26198datastate(struct stlport *portp);
static void stl_sc26198wait(struct stlport *portp);
static void stl_sc26198txunflow(struct stlport *portp, struct tty_struct *tty);
static void stl_sc26198intr(struct stlpanel *panelp, unsigned int iobase);
static void stl_sc26198txisr(struct stlport *port);
static void stl_sc26198rxisr(struct stlport *port, unsigned int iack);
static void stl_sc26198rxbadch(struct stlport *portp, unsigned char status, char ch);
static void stl_sc26198rxbadchars(struct stlport *portp);
static void stl_sc26198otherisr(struct stlport *port, unsigned int iack);
/*****************************************************************************/
/*
* Generic UART support structure.
*/
typedef struct uart {
int (*panelinit)(struct stlbrd *brdp, struct stlpanel *panelp);
void (*portinit)(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
void (*setport)(struct stlport *portp, struct ktermios *tiosp);
int (*getsignals)(struct stlport *portp);
void (*setsignals)(struct stlport *portp, int dtr, int rts);
void (*enablerxtx)(struct stlport *portp, int rx, int tx);
void (*startrxtx)(struct stlport *portp, int rx, int tx);
void (*disableintrs)(struct stlport *portp);
void (*sendbreak)(struct stlport *portp, int len);
void (*flowctrl)(struct stlport *portp, int state);
void (*sendflow)(struct stlport *portp, int state);
void (*flush)(struct stlport *portp);
int (*datastate)(struct stlport *portp);
void (*intr)(struct stlpanel *panelp, unsigned int iobase);
} uart_t;
/*
* Define some macros to make calling these functions nice and clean.
*/
#define stl_panelinit (* ((uart_t *) panelp->uartp)->panelinit)
#define stl_portinit (* ((uart_t *) portp->uartp)->portinit)
#define stl_setport (* ((uart_t *) portp->uartp)->setport)
#define stl_getsignals (* ((uart_t *) portp->uartp)->getsignals)
#define stl_setsignals (* ((uart_t *) portp->uartp)->setsignals)
#define stl_enablerxtx (* ((uart_t *) portp->uartp)->enablerxtx)
#define stl_startrxtx (* ((uart_t *) portp->uartp)->startrxtx)
#define stl_disableintrs (* ((uart_t *) portp->uartp)->disableintrs)
#define stl_sendbreak (* ((uart_t *) portp->uartp)->sendbreak)
#define stl_flowctrl (* ((uart_t *) portp->uartp)->flowctrl)
#define stl_sendflow (* ((uart_t *) portp->uartp)->sendflow)
#define stl_flush (* ((uart_t *) portp->uartp)->flush)
#define stl_datastate (* ((uart_t *) portp->uartp)->datastate)
/*****************************************************************************/
/*
* CD1400 UART specific data initialization.
*/
static uart_t stl_cd1400uart = {
stl_cd1400panelinit,
stl_cd1400portinit,
stl_cd1400setport,
stl_cd1400getsignals,
stl_cd1400setsignals,
stl_cd1400enablerxtx,
stl_cd1400startrxtx,
stl_cd1400disableintrs,
stl_cd1400sendbreak,
stl_cd1400flowctrl,
stl_cd1400sendflow,
stl_cd1400flush,
stl_cd1400datastate,
stl_cd1400eiointr
};
/*
* Define the offsets within the register bank of a cd1400 based panel.
* These io address offsets are common to the EasyIO board as well.
*/
#define EREG_ADDR 0
#define EREG_DATA 4
#define EREG_RXACK 5
#define EREG_TXACK 6
#define EREG_MDACK 7
#define EREG_BANKSIZE 8
#define CD1400_CLK 25000000
#define CD1400_CLK8M 20000000
/*
* Define the cd1400 baud rate clocks. These are used when calculating
* what clock and divisor to use for the required baud rate. Also
* define the maximum baud rate allowed, and the default base baud.
*/
static int stl_cd1400clkdivs[] = {
CD1400_CLK0, CD1400_CLK1, CD1400_CLK2, CD1400_CLK3, CD1400_CLK4
};
/*****************************************************************************/
/*
* SC26198 UART specific data initization.
*/
static uart_t stl_sc26198uart = {
stl_sc26198panelinit,
stl_sc26198portinit,
stl_sc26198setport,
stl_sc26198getsignals,
stl_sc26198setsignals,
stl_sc26198enablerxtx,
stl_sc26198startrxtx,
stl_sc26198disableintrs,
stl_sc26198sendbreak,
stl_sc26198flowctrl,
stl_sc26198sendflow,
stl_sc26198flush,
stl_sc26198datastate,
stl_sc26198intr
};
/*
* Define the offsets within the register bank of a sc26198 based panel.
*/
#define XP_DATA 0
#define XP_ADDR 1
#define XP_MODID 2
#define XP_STATUS 2
#define XP_IACK 3
#define XP_BANKSIZE 4
/*
* Define the sc26198 baud rate table. Offsets within the table
* represent the actual baud rate selector of sc26198 registers.
*/
static unsigned int sc26198_baudtable[] = {
50, 75, 150, 200, 300, 450, 600, 900, 1200, 1800, 2400, 3600,
4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200,
230400, 460800, 921600
};
#define SC26198_NRBAUDS ARRAY_SIZE(sc26198_baudtable)
/*****************************************************************************/
/*
* Define the driver info for a user level control device. Used mainly
* to get at port stats - only not using the port device itself.
*/
static const struct file_operations stl_fsiomem = {
.owner = THIS_MODULE,
.ioctl = stl_memioctl,
};
static struct class *stallion_class;
static void stl_cd_change(struct stlport *portp)
{
unsigned int oldsigs = portp->sigs;
struct tty_struct *tty = tty_port_tty_get(&portp->port);
if (!tty)
return;
portp->sigs = stl_getsignals(portp);
if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
wake_up_interruptible(&portp->port.open_wait);
if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0))
if (portp->port.flags & ASYNC_CHECK_CD)
tty_hangup(tty);
tty_kref_put(tty);
}
/*
* Check for any arguments passed in on the module load command line.
*/
/*****************************************************************************/
/*
* Parse the supplied argument string, into the board conf struct.
*/
static int __init stl_parsebrd(struct stlconf *confp, char **argp)
{
char *sp;
unsigned int i;
pr_debug("stl_parsebrd(confp=%p,argp=%p)\n", confp, argp);
if ((argp[0] == NULL) || (*argp[0] == 0))
return 0;
for (sp = argp[0], i = 0; (*sp != 0) && (i < 25); sp++, i++)
*sp = tolower(*sp);
for (i = 0; i < ARRAY_SIZE(stl_brdstr); i++)
if (strcmp(stl_brdstr[i].name, argp[0]) == 0)
break;
if (i == ARRAY_SIZE(stl_brdstr)) {
printk("STALLION: unknown board name, %s?\n", argp[0]);
return 0;
}
confp->brdtype = stl_brdstr[i].type;
i = 1;
if ((argp[i] != NULL) && (*argp[i] != 0))
confp->ioaddr1 = simple_strtoul(argp[i], NULL, 0);
i++;
if (confp->brdtype == BRD_ECH) {
if ((argp[i] != NULL) && (*argp[i] != 0))
confp->ioaddr2 = simple_strtoul(argp[i], NULL, 0);
i++;
}
if ((argp[i] != NULL) && (*argp[i] != 0))
confp->irq = simple_strtoul(argp[i], NULL, 0);
return 1;
}
/*****************************************************************************/
/*
* Allocate a new board structure. Fill out the basic info in it.
*/
static struct stlbrd *stl_allocbrd(void)
{
struct stlbrd *brdp;
brdp = kzalloc(sizeof(struct stlbrd), GFP_KERNEL);
if (!brdp) {
printk("STALLION: failed to allocate memory (size=%Zd)\n",
sizeof(struct stlbrd));
return NULL;
}
brdp->magic = STL_BOARDMAGIC;
return brdp;
}
/*****************************************************************************/
static int stl_open(struct tty_struct *tty, struct file *filp)
{
struct stlport *portp;
struct stlbrd *brdp;
struct tty_port *port;
unsigned int minordev, brdnr, panelnr;
int portnr;
pr_debug("stl_open(tty=%p,filp=%p): device=%s\n", tty, filp, tty->name);
minordev = tty->index;
brdnr = MINOR2BRD(minordev);
if (brdnr >= stl_nrbrds)
return -ENODEV;
brdp = stl_brds[brdnr];
if (brdp == NULL)
return -ENODEV;
minordev = MINOR2PORT(minordev);
for (portnr = -1, panelnr = 0; panelnr < STL_MAXPANELS; panelnr++) {
if (brdp->panels[panelnr] == NULL)
break;
if (minordev < brdp->panels[panelnr]->nrports) {
portnr = minordev;
break;
}
minordev -= brdp->panels[panelnr]->nrports;
}
if (portnr < 0)
return -ENODEV;
portp = brdp->panels[panelnr]->ports[portnr];
if (portp == NULL)
return -ENODEV;
port = &portp->port;
/*
* On the first open of the device setup the port hardware, and
* initialize the per port data structure.
*/
tty_port_tty_set(port, tty);
tty->driver_data = portp;
port->count++;
if ((port->flags & ASYNC_INITIALIZED) == 0) {
if (!portp->tx.buf) {
portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
if (!portp->tx.buf)
return -ENOMEM;
portp->tx.head = portp->tx.buf;
portp->tx.tail = portp->tx.buf;
}
stl_setport(portp, tty->termios);
portp->sigs = stl_getsignals(portp);
stl_setsignals(portp, 1, 1);
stl_enablerxtx(portp, 1, 1);
stl_startrxtx(portp, 1, 0);
clear_bit(TTY_IO_ERROR, &tty->flags);
port->flags |= ASYNC_INITIALIZED;
}
return tty_port_block_til_ready(port, tty, filp);
}
/*****************************************************************************/
static int stl_carrier_raised(struct tty_port *port)
{
struct stlport *portp = container_of(port, struct stlport, port);
return (portp->sigs & TIOCM_CD) ? 1 : 0;
}
static void stl_dtr_rts(struct tty_port *port, int on)
{
struct stlport *portp = container_of(port, struct stlport, port);
/* Takes brd_lock internally */
stl_setsignals(portp, on, on);
}
/*****************************************************************************/
static void stl_flushbuffer(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_flushbuffer(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
stl_flush(portp);
tty_wakeup(tty);
}
/*****************************************************************************/
static void stl_waituntilsent(struct tty_struct *tty, int timeout)
{
struct stlport *portp;
unsigned long tend;
pr_debug("stl_waituntilsent(tty=%p,timeout=%d)\n", tty, timeout);
portp = tty->driver_data;
if (portp == NULL)
return;
if (timeout == 0)
timeout = HZ;
tend = jiffies + timeout;
lock_kernel();
while (stl_datastate(portp)) {
if (signal_pending(current))
break;
msleep_interruptible(20);
if (time_after_eq(jiffies, tend))
break;
}
unlock_kernel();
}
/*****************************************************************************/
static void stl_close(struct tty_struct *tty, struct file *filp)
{
struct stlport *portp;
struct tty_port *port;
unsigned long flags;
pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
portp = tty->driver_data;
BUG_ON(portp == NULL);
port = &portp->port;
if (tty_port_close_start(port, tty, filp) == 0)
return;
/*
* May want to wait for any data to drain before closing. The BUSY
* flag keeps track of whether we are still sending or not - it is
* very accurate for the cd1400, not quite so for the sc26198.
* (The sc26198 has no "end-of-data" interrupt only empty FIFO)
*/
stl_waituntilsent(tty, (HZ / 2));
spin_lock_irqsave(&port->lock, flags);
portp->port.flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&port->lock, flags);
stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
stl_setsignals(portp, 0, 0);
stl_enablerxtx(portp, 0, 0);
stl_flushbuffer(tty);
portp->istate = 0;
if (portp->tx.buf != NULL) {
kfree(portp->tx.buf);
portp->tx.buf = NULL;
portp->tx.head = NULL;
portp->tx.tail = NULL;
}
tty_port_close_end(port, tty);
tty_port_tty_set(port, NULL);
}
/*****************************************************************************/
/*
* Write routine. Take data and stuff it in to the TX ring queue.
* If transmit interrupts are not running then start them.
*/
static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct stlport *portp;
unsigned int len, stlen;
unsigned char *chbuf;
char *head, *tail;
pr_debug("stl_write(tty=%p,buf=%p,count=%d)\n", tty, buf, count);
portp = tty->driver_data;
if (portp == NULL)
return 0;
if (portp->tx.buf == NULL)
return 0;
/*
* If copying direct from user space we must cater for page faults,
* causing us to "sleep" here for a while. To handle this copy in all
* the data we need now, into a local buffer. Then when we got it all
* copy it into the TX buffer.
*/
chbuf = (unsigned char *) buf;
head = portp->tx.head;
tail = portp->tx.tail;
if (head >= tail) {
len = STL_TXBUFSIZE - (head - tail) - 1;
stlen = STL_TXBUFSIZE - (head - portp->tx.buf);
} else {
len = tail - head - 1;
stlen = len;
}
len = min(len, (unsigned int)count);
count = 0;
while (len > 0) {
stlen = min(len, stlen);
memcpy(head, chbuf, stlen);
len -= stlen;
chbuf += stlen;
count += stlen;
head += stlen;
if (head >= (portp->tx.buf + STL_TXBUFSIZE)) {
head = portp->tx.buf;
stlen = tail - head;
}
}
portp->tx.head = head;
clear_bit(ASYI_TXLOW, &portp->istate);
stl_startrxtx(portp, -1, 1);
return count;
}
/*****************************************************************************/
static int stl_putchar(struct tty_struct *tty, unsigned char ch)
{
struct stlport *portp;
unsigned int len;
char *head, *tail;
pr_debug("stl_putchar(tty=%p,ch=%x)\n", tty, ch);
portp = tty->driver_data;
if (portp == NULL)
return -EINVAL;
if (portp->tx.buf == NULL)
return -EINVAL;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (STL_TXBUFSIZE - (head - tail)) : (tail - head);
len--;
if (len > 0) {
*head++ = ch;
if (head >= (portp->tx.buf + STL_TXBUFSIZE))
head = portp->tx.buf;
}
portp->tx.head = head;
return 0;
}
/*****************************************************************************/
/*
* If there are any characters in the buffer then make sure that TX
* interrupts are on and get'em out. Normally used after the putchar
* routine has been called.
*/
static void stl_flushchars(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_flushchars(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
if (portp->tx.buf == NULL)
return;
stl_startrxtx(portp, -1, 1);
}
/*****************************************************************************/
static int stl_writeroom(struct tty_struct *tty)
{
struct stlport *portp;
char *head, *tail;
pr_debug("stl_writeroom(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return 0;
if (portp->tx.buf == NULL)
return 0;
head = portp->tx.head;
tail = portp->tx.tail;
return (head >= tail) ? (STL_TXBUFSIZE - (head - tail) - 1) : (tail - head - 1);
}
/*****************************************************************************/
/*
* Return number of chars in the TX buffer. Normally we would just
* calculate the number of chars in the buffer and return that, but if
* the buffer is empty and TX interrupts are still on then we return
* that the buffer still has 1 char in it. This way whoever called us
* will not think that ALL chars have drained - since the UART still
* must have some chars in it (we are busy after all).
*/
static int stl_charsinbuffer(struct tty_struct *tty)
{
struct stlport *portp;
unsigned int size;
char *head, *tail;
pr_debug("stl_charsinbuffer(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return 0;
if (portp->tx.buf == NULL)
return 0;
head = portp->tx.head;
tail = portp->tx.tail;
size = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((size == 0) && test_bit(ASYI_TXBUSY, &portp->istate))
size = 1;
return size;
}
/*****************************************************************************/
/*
* Generate the serial struct info.
*/
static int stl_getserial(struct stlport *portp, struct serial_struct __user *sp)
{
struct serial_struct sio;
struct stlbrd *brdp;
pr_debug("stl_getserial(portp=%p,sp=%p)\n", portp, sp);
memset(&sio, 0, sizeof(struct serial_struct));
sio.line = portp->portnr;
sio.port = portp->ioaddr;
sio.flags = portp->port.flags;
sio.baud_base = portp->baud_base;
sio.close_delay = portp->close_delay;
sio.closing_wait = portp->closing_wait;
sio.custom_divisor = portp->custom_divisor;
sio.hub6 = 0;
if (portp->uartp == &stl_cd1400uart) {
sio.type = PORT_CIRRUS;
sio.xmit_fifo_size = CD1400_TXFIFOSIZE;
} else {
sio.type = PORT_UNKNOWN;
sio.xmit_fifo_size = SC26198_TXFIFOSIZE;
}
brdp = stl_brds[portp->brdnr];
if (brdp != NULL)
sio.irq = brdp->irq;
return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Set port according to the serial struct info.
* At this point we do not do any auto-configure stuff, so we will
* just quietly ignore any requests to change irq, etc.
*/
static int stl_setserial(struct tty_struct *tty, struct serial_struct __user *sp)
{
struct stlport * portp = tty->driver_data;
struct serial_struct sio;
pr_debug("stl_setserial(portp=%p,sp=%p)\n", portp, sp);
if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
return -EFAULT;
if (!capable(CAP_SYS_ADMIN)) {
if ((sio.baud_base != portp->baud_base) ||
(sio.close_delay != portp->close_delay) ||
((sio.flags & ~ASYNC_USR_MASK) !=
(portp->port.flags & ~ASYNC_USR_MASK)))
return -EPERM;
}
portp->port.flags = (portp->port.flags & ~ASYNC_USR_MASK) |
(sio.flags & ASYNC_USR_MASK);
portp->baud_base = sio.baud_base;
portp->close_delay = sio.close_delay;
portp->closing_wait = sio.closing_wait;
portp->custom_divisor = sio.custom_divisor;
stl_setport(portp, tty->termios);
return 0;
}
/*****************************************************************************/
static int stl_tiocmget(struct tty_struct *tty, struct file *file)
{
struct stlport *portp;
portp = tty->driver_data;
if (portp == NULL)
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
return stl_getsignals(portp);
}
static int stl_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct stlport *portp;
int rts = -1, dtr = -1;
portp = tty->driver_data;
if (portp == NULL)
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
if (set & TIOCM_RTS)
rts = 1;
if (set & TIOCM_DTR)
dtr = 1;
if (clear & TIOCM_RTS)
rts = 0;
if (clear & TIOCM_DTR)
dtr = 0;
stl_setsignals(portp, dtr, rts);
return 0;
}
static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
struct stlport *portp;
int rc;
void __user *argp = (void __user *)arg;
pr_debug("stl_ioctl(tty=%p,file=%p,cmd=%x,arg=%lx)\n", tty, file, cmd,
arg);
portp = tty->driver_data;
if (portp == NULL)
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS))
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
rc = 0;
lock_kernel();
switch (cmd) {
case TIOCGSERIAL:
rc = stl_getserial(portp, argp);
break;
case TIOCSSERIAL:
rc = stl_setserial(tty, argp);
break;
case COM_GETPORTSTATS:
rc = stl_getportstats(tty, portp, argp);
break;
case COM_CLRPORTSTATS:
rc = stl_clrportstats(portp, argp);
break;
case TIOCSERCONFIG:
case TIOCSERGWILD:
case TIOCSERSWILD:
case TIOCSERGETLSR:
case TIOCSERGSTRUCT:
case TIOCSERGETMULTI:
case TIOCSERSETMULTI:
default:
rc = -ENOIOCTLCMD;
break;
}
unlock_kernel();
return rc;
}
/*****************************************************************************/
/*
* Start the transmitter again. Just turn TX interrupts back on.
*/
static void stl_start(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_start(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
stl_startrxtx(portp, -1, 1);
}
/*****************************************************************************/
static void stl_settermios(struct tty_struct *tty, struct ktermios *old)
{
struct stlport *portp;
struct ktermios *tiosp;
pr_debug("stl_settermios(tty=%p,old=%p)\n", tty, old);
portp = tty->driver_data;
if (portp == NULL)
return;
tiosp = tty->termios;
if ((tiosp->c_cflag == old->c_cflag) &&
(tiosp->c_iflag == old->c_iflag))
return;
stl_setport(portp, tiosp);
stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
-1);
if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
tty->hw_stopped = 0;
stl_start(tty);
}
if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
wake_up_interruptible(&portp->port.open_wait);
}
/*****************************************************************************/
/*
* Attempt to flow control who ever is sending us data. Based on termios
* settings use software or/and hardware flow control.
*/
static void stl_throttle(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_throttle(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
stl_flowctrl(portp, 0);
}
/*****************************************************************************/
/*
* Unflow control the device sending us data...
*/
static void stl_unthrottle(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_unthrottle(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
stl_flowctrl(portp, 1);
}
/*****************************************************************************/
/*
* Stop the transmitter. Basically to do this we will just turn TX
* interrupts off.
*/
static void stl_stop(struct tty_struct *tty)
{
struct stlport *portp;
pr_debug("stl_stop(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
stl_startrxtx(portp, -1, 0);
}
/*****************************************************************************/
/*
* Hangup this port. This is pretty much like closing the port, only
* a little more brutal. No waiting for data to drain. Shutdown the
* port and maybe drop signals.
*/
static void stl_hangup(struct tty_struct *tty)
{
struct stlport *portp;
struct tty_port *port;
unsigned long flags;
pr_debug("stl_hangup(tty=%p)\n", tty);
portp = tty->driver_data;
if (portp == NULL)
return;
port = &portp->port;
spin_lock_irqsave(&port->lock, flags);
port->flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&port->lock, flags);
stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
stl_setsignals(portp, 0, 0);
stl_enablerxtx(portp, 0, 0);
stl_flushbuffer(tty);
portp->istate = 0;
set_bit(TTY_IO_ERROR, &tty->flags);
if (portp->tx.buf != NULL) {
kfree(portp->tx.buf);
portp->tx.buf = NULL;
portp->tx.head = NULL;
portp->tx.tail = NULL;
}
tty_port_hangup(port);
}
/*****************************************************************************/
static int stl_breakctl(struct tty_struct *tty, int state)
{
struct stlport *portp;
pr_debug("stl_breakctl(tty=%p,state=%d)\n", tty, state);
portp = tty->driver_data;
if (portp == NULL)
return -EINVAL;
stl_sendbreak(portp, ((state == -1) ? 1 : 2));
return 0;
}
/*****************************************************************************/
static void stl_sendxchar(struct tty_struct *tty, char ch)
{
struct stlport *portp;
pr_debug("stl_sendxchar(tty=%p,ch=%x)\n", tty, ch);
portp = tty->driver_data;
if (portp == NULL)
return;
if (ch == STOP_CHAR(tty))
stl_sendflow(portp, 0);
else if (ch == START_CHAR(tty))
stl_sendflow(portp, 1);
else
stl_putchar(tty, ch);
}
static void stl_portinfo(struct seq_file *m, struct stlport *portp, int portnr)
{
int sigs;
char sep;
seq_printf(m, "%d: uart:%s tx:%d rx:%d",
portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
(int) portp->stats.txtotal, (int) portp->stats.rxtotal);
if (portp->stats.rxframing)
seq_printf(m, " fe:%d", (int) portp->stats.rxframing);
if (portp->stats.rxparity)
seq_printf(m, " pe:%d", (int) portp->stats.rxparity);
if (portp->stats.rxbreaks)
seq_printf(m, " brk:%d", (int) portp->stats.rxbreaks);
if (portp->stats.rxoverrun)
seq_printf(m, " oe:%d", (int) portp->stats.rxoverrun);
sigs = stl_getsignals(portp);
sep = ' ';
if (sigs & TIOCM_RTS) {
seq_printf(m, "%c%s", sep, "RTS");
sep = '|';
}
if (sigs & TIOCM_CTS) {
seq_printf(m, "%c%s", sep, "CTS");
sep = '|';
}
if (sigs & TIOCM_DTR) {
seq_printf(m, "%c%s", sep, "DTR");
sep = '|';
}
if (sigs & TIOCM_CD) {
seq_printf(m, "%c%s", sep, "DCD");
sep = '|';
}
if (sigs & TIOCM_DSR) {
seq_printf(m, "%c%s", sep, "DSR");
sep = '|';
}
seq_putc(m, '\n');
}
/*****************************************************************************/
/*
* Port info, read from the /proc file system.
*/
static int stl_proc_show(struct seq_file *m, void *v)
{
struct stlbrd *brdp;
struct stlpanel *panelp;
struct stlport *portp;
unsigned int brdnr, panelnr, portnr;
int totalport;
totalport = 0;
seq_printf(m, "%s: version %s\n", stl_drvtitle, stl_drvversion);
/*
* We scan through for each board, panel and port. The offset is
* calculated on the fly, and irrelevant ports are skipped.
*/
for (brdnr = 0; brdnr < stl_nrbrds; brdnr++) {
brdp = stl_brds[brdnr];
if (brdp == NULL)
continue;
if (brdp->state == 0)
continue;
totalport = brdnr * STL_MAXPORTS;
for (panelnr = 0; panelnr < brdp->nrpanels; panelnr++) {
panelp = brdp->panels[panelnr];
if (panelp == NULL)
continue;
for (portnr = 0; portnr < panelp->nrports; portnr++,
totalport++) {
portp = panelp->ports[portnr];
if (portp == NULL)
continue;
stl_portinfo(m, portp, totalport);
}
}
}
return 0;
}
static int stl_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, stl_proc_show, NULL);
}
static const struct file_operations stl_proc_fops = {
.owner = THIS_MODULE,
.open = stl_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/*****************************************************************************/
/*
* All board interrupts are vectored through here first. This code then
* calls off to the approrpriate board interrupt handlers.
*/
static irqreturn_t stl_intr(int irq, void *dev_id)
{
struct stlbrd *brdp = dev_id;
pr_debug("stl_intr(brdp=%p,irq=%d)\n", brdp, brdp->irq);
return IRQ_RETVAL((* brdp->isr)(brdp));
}
/*****************************************************************************/
/*
* Interrupt service routine for EasyIO board types.
*/
static int stl_eiointr(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int iobase;
int handled = 0;
spin_lock(&brd_lock);
panelp = brdp->panels[0];
iobase = panelp->iobase;
while (inb(brdp->iostatus) & EIO_INTRPEND) {
handled = 1;
(* panelp->isr)(panelp, iobase);
}
spin_unlock(&brd_lock);
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-AT board types.
*/
static int stl_echatintr(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int ioaddr, bnknr;
int handled = 0;
outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
while (inb(brdp->iostatus) & ECH_INTRPEND) {
handled = 1;
for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-MCA board types.
*/
static int stl_echmcaintr(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int ioaddr, bnknr;
int handled = 0;
while (inb(brdp->iostatus) & ECH_INTRPEND) {
handled = 1;
for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-PCI board types.
*/
static int stl_echpciintr(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int ioaddr, bnknr, recheck;
int handled = 0;
while (1) {
recheck = 0;
for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
outb(brdp->bnkpageaddr[bnknr], brdp->ioctrl);
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
recheck++;
handled = 1;
}
}
if (! recheck)
break;
}
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-8/64-PCI board types.
*/
static int stl_echpci64intr(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int ioaddr, bnknr;
int handled = 0;
while (inb(brdp->ioctrl) & 0x1) {
handled = 1;
for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
return handled;
}
/*****************************************************************************/
/*
* Initialize all the ports on a panel.
*/
static int __devinit stl_initports(struct stlbrd *brdp, struct stlpanel *panelp)
{
struct stlport *portp;
unsigned int i;
int chipmask;
pr_debug("stl_initports(brdp=%p,panelp=%p)\n", brdp, panelp);
chipmask = stl_panelinit(brdp, panelp);
/*
* All UART's are initialized (if found!). Now go through and setup
* each ports data structures.
*/
for (i = 0; i < panelp->nrports; i++) {
portp = kzalloc(sizeof(struct stlport), GFP_KERNEL);
if (!portp) {
printk("STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(struct stlport));
break;
}
tty_port_init(&portp->port);
portp->port.ops = &stl_port_ops;
portp->magic = STL_PORTMAGIC;
portp->portnr = i;
portp->brdnr = panelp->brdnr;
portp->panelnr = panelp->panelnr;
portp->uartp = panelp->uartp;
portp->clk = brdp->clk;
portp->baud_base = STL_BAUDBASE;
portp->close_delay = STL_CLOSEDELAY;
portp->closing_wait = 30 * HZ;
init_waitqueue_head(&portp->port.open_wait);
init_waitqueue_head(&portp->port.close_wait);
portp->stats.brd = portp->brdnr;
portp->stats.panel = portp->panelnr;
portp->stats.port = portp->portnr;
panelp->ports[i] = portp;
stl_portinit(brdp, panelp, portp);
}
return 0;
}
static void stl_cleanup_panels(struct stlbrd *brdp)
{
struct stlpanel *panelp;
struct stlport *portp;
unsigned int j, k;
struct tty_struct *tty;
for (j = 0; j < STL_MAXPANELS; j++) {
panelp = brdp->panels[j];
if (panelp == NULL)
continue;
for (k = 0; k < STL_PORTSPERPANEL; k++) {
portp = panelp->ports[k];
if (portp == NULL)
continue;
tty = tty_port_tty_get(&portp->port);
if (tty != NULL) {
stl_hangup(tty);
tty_kref_put(tty);
}
kfree(portp->tx.buf);
kfree(portp);
}
kfree(panelp);
}
}
/*****************************************************************************/
/*
* Try to find and initialize an EasyIO board.
*/
static int __devinit stl_initeio(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int status;
char *name;
int retval;
pr_debug("stl_initeio(brdp=%p)\n", brdp);
brdp->ioctrl = brdp->ioaddr1 + 1;
brdp->iostatus = brdp->ioaddr1 + 2;
status = inb(brdp->iostatus);
if ((status & EIO_IDBITMASK) == EIO_MK3)
brdp->ioctrl++;
/*
* Handle board specific stuff now. The real difference is PCI
* or not PCI.
*/
if (brdp->brdtype == BRD_EASYIOPCI) {
brdp->iosize1 = 0x80;
brdp->iosize2 = 0x80;
name = "serial(EIO-PCI)";
outb(0x41, (brdp->ioaddr2 + 0x4c));
} else {
brdp->iosize1 = 8;
name = "serial(EIO)";
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
retval = -EINVAL;
goto err;
}
outb((stl_vecmap[brdp->irq] | EIO_0WS |
((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
brdp->ioctrl);
}
retval = -EBUSY;
if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
"%x conflicts with another device\n", brdp->brdnr,
brdp->ioaddr1);
goto err;
}
if (brdp->iosize2 > 0)
if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O "
"address %x conflicts with another device\n",
brdp->brdnr, brdp->ioaddr2);
printk(KERN_WARNING "STALLION: Warning, also "
"releasing board %d I/O address %x \n",
brdp->brdnr, brdp->ioaddr1);
goto err_rel1;
}
/*
* Everything looks OK, so let's go ahead and probe for the hardware.
*/
brdp->clk = CD1400_CLK;
brdp->isr = stl_eiointr;
retval = -ENODEV;
switch (status & EIO_IDBITMASK) {
case EIO_8PORTM:
brdp->clk = CD1400_CLK8M;
/* fall thru */
case EIO_8PORTRS:
case EIO_8PORTDI:
brdp->nrports = 8;
break;
case EIO_4PORTRS:
brdp->nrports = 4;
break;
case EIO_MK3:
switch (status & EIO_BRDMASK) {
case ID_BRD4:
brdp->nrports = 4;
break;
case ID_BRD8:
brdp->nrports = 8;
break;
case ID_BRD16:
brdp->nrports = 16;
break;
default:
goto err_rel2;
}
break;
default:
goto err_rel2;
}
/*
* We have verified that the board is actually present, so now we
* can complete the setup.
*/
panelp = kzalloc(sizeof(struct stlpanel), GFP_KERNEL);
if (!panelp) {
printk(KERN_WARNING "STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(struct stlpanel));
retval = -ENOMEM;
goto err_rel2;
}
panelp->magic = STL_PANELMAGIC;
panelp->brdnr = brdp->brdnr;
panelp->panelnr = 0;
panelp->nrports = brdp->nrports;
panelp->iobase = brdp->ioaddr1;
panelp->hwid = status;
if ((status & EIO_IDBITMASK) == EIO_MK3) {
panelp->uartp = &stl_sc26198uart;
panelp->isr = stl_sc26198intr;
} else {
panelp->uartp = &stl_cd1400uart;
panelp->isr = stl_cd1400eiointr;
}
brdp->panels[0] = panelp;
brdp->nrpanels = 1;
brdp->state |= BRD_FOUND;
brdp->hwid = status;
if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
printk("STALLION: failed to register interrupt "
"routine for %s irq=%d\n", name, brdp->irq);
retval = -ENODEV;
goto err_fr;
}
return 0;
err_fr:
stl_cleanup_panels(brdp);
err_rel2:
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
err_rel1:
release_region(brdp->ioaddr1, brdp->iosize1);
err:
return retval;
}
/*****************************************************************************/
/*
* Try to find an ECH board and initialize it. This code is capable of
* dealing with all types of ECH board.
*/
static int __devinit stl_initech(struct stlbrd *brdp)
{
struct stlpanel *panelp;
unsigned int status, nxtid, ioaddr, conflict, panelnr, banknr, i;
int retval;
char *name;
pr_debug("stl_initech(brdp=%p)\n", brdp);
status = 0;
conflict = 0;
/*
* Set up the initial board register contents for boards. This varies a
* bit between the different board types. So we need to handle each
* separately. Also do a check that the supplied IRQ is good.
*/
switch (brdp->brdtype) {
case BRD_ECH:
brdp->isr = stl_echatintr;
brdp->ioctrl = brdp->ioaddr1 + 1;
brdp->iostatus = brdp->ioaddr1 + 1;
status = inb(brdp->iostatus);
if ((status & ECH_IDBITMASK) != ECH_ID) {
retval = -ENODEV;
goto err;
}
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
retval = -EINVAL;
goto err;
}
status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
status |= (stl_vecmap[brdp->irq] << 1);
outb((status | ECH_BRDRESET), brdp->ioaddr1);
brdp->ioctrlval = ECH_INTENABLE |
((brdp->irqtype) ? ECH_INTLEVEL : ECH_INTEDGE);
for (i = 0; i < 10; i++)
outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
brdp->iosize1 = 2;
brdp->iosize2 = 32;
name = "serial(EC8/32)";
outb(status, brdp->ioaddr1);
break;
case BRD_ECHMC:
brdp->isr = stl_echmcaintr;
brdp->ioctrl = brdp->ioaddr1 + 0x20;
brdp->iostatus = brdp->ioctrl;
status = inb(brdp->iostatus);
if ((status & ECH_IDBITMASK) != ECH_ID) {
retval = -ENODEV;
goto err;
}
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
retval = -EINVAL;
goto err;
}
outb(ECHMC_BRDRESET, brdp->ioctrl);
outb(ECHMC_INTENABLE, brdp->ioctrl);
brdp->iosize1 = 64;
name = "serial(EC8/32-MC)";
break;
case BRD_ECHPCI:
brdp->isr = stl_echpciintr;
brdp->ioctrl = brdp->ioaddr1 + 2;
brdp->iosize1 = 4;
brdp->iosize2 = 8;
name = "serial(EC8/32-PCI)";
break;
case BRD_ECH64PCI:
brdp->isr = stl_echpci64intr;
brdp->ioctrl = brdp->ioaddr2 + 0x40;
outb(0x43, (brdp->ioaddr1 + 0x4c));
brdp->iosize1 = 0x80;
brdp->iosize2 = 0x80;
name = "serial(EC8/64-PCI)";
break;
default:
printk("STALLION: unknown board type=%d\n", brdp->brdtype);
retval = -EINVAL;
goto err;
}
/*
* Check boards for possible IO address conflicts and return fail status
* if an IO conflict found.
*/
retval = -EBUSY;
if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
"%x conflicts with another device\n", brdp->brdnr,
brdp->ioaddr1);
goto err;
}
if (brdp->iosize2 > 0)
if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O "
"address %x conflicts with another device\n",
brdp->brdnr, brdp->ioaddr2);
printk(KERN_WARNING "STALLION: Warning, also "
"releasing board %d I/O address %x \n",
brdp->brdnr, brdp->ioaddr1);
goto err_rel1;
}
/*
* Scan through the secondary io address space looking for panels.
* As we find'em allocate and initialize panel structures for each.
*/
brdp->clk = CD1400_CLK;
brdp->hwid = status;
ioaddr = brdp->ioaddr2;
banknr = 0;
panelnr = 0;
nxtid = 0;
for (i = 0; i < STL_MAXPANELS; i++) {
if (brdp->brdtype == BRD_ECHPCI) {
outb(nxtid, brdp->ioctrl);
ioaddr = brdp->ioaddr2;
}
status = inb(ioaddr + ECH_PNLSTATUS);
if ((status & ECH_PNLIDMASK) != nxtid)
break;
panelp = kzalloc(sizeof(struct stlpanel), GFP_KERNEL);
if (!panelp) {
printk("STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(struct stlpanel));
retval = -ENOMEM;
goto err_fr;
}
panelp->magic = STL_PANELMAGIC;
panelp->brdnr = brdp->brdnr;
panelp->panelnr = panelnr;
panelp->iobase = ioaddr;
panelp->pagenr = nxtid;
panelp->hwid = status;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = nxtid;
brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;
if (status & ECH_PNLXPID) {
panelp->uartp = &stl_sc26198uart;
panelp->isr = stl_sc26198intr;
if (status & ECH_PNL16PORT) {
panelp->nrports = 16;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = nxtid;
brdp->bnkstataddr[banknr++] = ioaddr + 4 +
ECH_PNLSTATUS;
} else
panelp->nrports = 8;
} else {
panelp->uartp = &stl_cd1400uart;
panelp->isr = stl_cd1400echintr;
if (status & ECH_PNL16PORT) {
panelp->nrports = 16;
panelp->ackmask = 0x80;
if (brdp->brdtype != BRD_ECHPCI)
ioaddr += EREG_BANKSIZE;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = ++nxtid;
brdp->bnkstataddr[banknr++] = ioaddr +
ECH_PNLSTATUS;
} else {
panelp->nrports = 8;
panelp->ackmask = 0xc0;
}
}
nxtid++;
ioaddr += EREG_BANKSIZE;
brdp->nrports += panelp->nrports;
brdp->panels[panelnr++] = panelp;
if ((brdp->brdtype != BRD_ECHPCI) &&
(ioaddr >= (brdp->ioaddr2 + brdp->iosize2))) {
retval = -EINVAL;
goto err_fr;
}
}
brdp->nrpanels = panelnr;
brdp->nrbnks = banknr;
if (brdp->brdtype == BRD_ECH)
outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
brdp->state |= BRD_FOUND;
if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
printk("STALLION: failed to register interrupt "
"routine for %s irq=%d\n", name, brdp->irq);
retval = -ENODEV;
goto err_fr;
}
return 0;
err_fr:
stl_cleanup_panels(brdp);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
err_rel1:
release_region(brdp->ioaddr1, brdp->iosize1);
err:
return retval;
}
/*****************************************************************************/
/*
* 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 __devinit stl_brdinit(struct stlbrd *brdp)
{
int i, retval;
pr_debug("stl_brdinit(brdp=%p)\n", brdp);
switch (brdp->brdtype) {
case BRD_EASYIO:
case BRD_EASYIOPCI:
retval = stl_initeio(brdp);
if (retval)
goto err;
break;
case BRD_ECH:
case BRD_ECHMC:
case BRD_ECHPCI:
case BRD_ECH64PCI:
retval = stl_initech(brdp);
if (retval)
goto err;
break;
default:
printk("STALLION: board=%d is unknown board type=%d\n",
brdp->brdnr, brdp->brdtype);
retval = -ENODEV;
goto err;
}
if ((brdp->state & BRD_FOUND) == 0) {
printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
stl_brdnames[brdp->brdtype], brdp->brdnr,
brdp->ioaddr1, brdp->irq);
goto err_free;
}
for (i = 0; i < STL_MAXPANELS; i++)
if (brdp->panels[i] != NULL)
stl_initports(brdp, brdp->panels[i]);
printk("STALLION: %s found, board=%d io=%x irq=%d "
"nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
brdp->nrports);
return 0;
err_free:
free_irq(brdp->irq, brdp);
stl_cleanup_panels(brdp);
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
err:
return retval;
}
/*****************************************************************************/
/*
* Find the next available board number that is free.
*/
static int __devinit stl_getbrdnr(void)
{
unsigned int i;
for (i = 0; i < STL_MAXBRDS; i++)
if (stl_brds[i] == NULL) {
if (i >= stl_nrbrds)
stl_nrbrds = i + 1;
return i;
}
return -1;
}
/*****************************************************************************/
/*
* We have a Stallion board. Allocate a board structure and
* initialize it. Read its IO and IRQ resources from PCI
* configuration space.
*/
static int __devinit stl_pciprobe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct stlbrd *brdp;
unsigned int i, brdtype = ent->driver_data;
int brdnr, retval = -ENODEV;
if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE)
goto err;
retval = pci_enable_device(pdev);
if (retval)
goto err;
brdp = stl_allocbrd();
if (brdp == NULL) {
retval = -ENOMEM;
goto err;
}
mutex_lock(&stl_brdslock);
brdnr = stl_getbrdnr();
if (brdnr < 0) {
dev_err(&pdev->dev, "too many boards found, "
"maximum supported %d\n", STL_MAXBRDS);
mutex_unlock(&stl_brdslock);
retval = -ENODEV;
goto err_fr;
}
brdp->brdnr = (unsigned int)brdnr;
stl_brds[brdp->brdnr] = brdp;
mutex_unlock(&stl_brdslock);
brdp->brdtype = brdtype;
brdp->state |= STL_PROBED;
/*
* 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(pdev, 0);
brdp->ioaddr1 = pci_resource_start(pdev, 1);
break;
case BRD_ECH64PCI:
brdp->ioaddr2 = pci_resource_start(pdev, 2);
brdp->ioaddr1 = pci_resource_start(pdev, 1);
break;
case BRD_EASYIOPCI:
brdp->ioaddr1 = pci_resource_start(pdev, 2);
brdp->ioaddr2 = pci_resource_start(pdev, 1);
break;
default:
dev_err(&pdev->dev, "unknown PCI board type=%u\n", brdtype);
break;
}
brdp->irq = pdev->irq;
retval = stl_brdinit(brdp);
if (retval)
goto err_null;
pci_set_drvdata(pdev, brdp);
for (i = 0; i < brdp->nrports; i++)
tty_register_device(stl_serial,
brdp->brdnr * STL_MAXPORTS + i, &pdev->dev);
return 0;
err_null:
stl_brds[brdp->brdnr] = NULL;
err_fr:
kfree(brdp);
err:
return retval;
}
static void __devexit stl_pciremove(struct pci_dev *pdev)
{
struct stlbrd *brdp = pci_get_drvdata(pdev);
unsigned int i;
free_irq(brdp->irq, brdp);
stl_cleanup_panels(brdp);
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
for (i = 0; i < brdp->nrports; i++)
tty_unregister_device(stl_serial,
brdp->brdnr * STL_MAXPORTS + i);
stl_brds[brdp->brdnr] = NULL;
kfree(brdp);
}
static struct pci_driver stl_pcidriver = {
.name = "stallion",
.id_table = stl_pcibrds,
.probe = stl_pciprobe,
.remove = __devexit_p(stl_pciremove)
};
/*****************************************************************************/
/*
* Return the board stats structure to user app.
*/
static int stl_getbrdstats(combrd_t __user *bp)
{
combrd_t stl_brdstats;
struct stlbrd *brdp;
struct stlpanel *panelp;
unsigned int i;
if (copy_from_user(&stl_brdstats, bp, sizeof(combrd_t)))
return -EFAULT;
if (stl_brdstats.brd >= STL_MAXBRDS)
return -ENODEV;
brdp = stl_brds[stl_brdstats.brd];
if (brdp == 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;
}
return copy_to_user(bp, &stl_brdstats, sizeof(combrd_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Resolve the referenced port number into a port struct pointer.
*/
static struct stlport *stl_getport(int brdnr, int panelnr, int portnr)
{
struct stlbrd *brdp;
struct stlpanel *panelp;
if (brdnr < 0 || brdnr >= STL_MAXBRDS)
return NULL;
brdp = stl_brds[brdnr];
if (brdp == NULL)
return NULL;
if (panelnr < 0 || (unsigned int)panelnr >= brdp->nrpanels)
return NULL;
panelp = brdp->panels[panelnr];
if (panelp == NULL)
return NULL;
if (portnr < 0 || (unsigned int)portnr >= panelp->nrports)
return 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(struct tty_struct *tty, struct stlport *portp, comstats_t __user *cp)
{
comstats_t stl_comstats;
unsigned char *head, *tail;
unsigned long flags;
if (!portp) {
if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
return -EFAULT;
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == NULL)
return -ENODEV;
}
portp->stats.state = portp->istate;
portp->stats.flags = portp->port.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;
spin_lock_irqsave(&stallion_lock, flags);
if (tty != NULL && portp->port.tty == tty) {
portp->stats.ttystate = tty->flags;
/* No longer available as a statistic */
portp->stats.rxbuffered = 1; /*tty->flip.count; */
if (tty->termios != NULL) {
portp->stats.cflags = tty->termios->c_cflag;
portp->stats.iflags = tty->termios->c_iflag;
portp->stats.oflags = tty->termios->c_oflag;
portp->stats.lflags = tty->termios->c_lflag;
}
}
spin_unlock_irqrestore(&stallion_lock, 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);
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Clear the port stats structure. We also return it zeroed out...
*/
static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp)
{
comstats_t stl_comstats;
if (!portp) {
if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
return -EFAULT;
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == 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;
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Return the entire driver ports structure to a user app.
*/
static int stl_getportstruct(struct stlport __user *arg)
{
struct stlport stl_dummyport;
struct stlport *portp;
if (copy_from_user(&stl_dummyport, arg, sizeof(struct stlport)))
return -EFAULT;
portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
stl_dummyport.portnr);
if (!portp)
return -ENODEV;
return copy_to_user(arg, portp, sizeof(struct stlport)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Return the entire driver board structure to a user app.
*/
static int stl_getbrdstruct(struct stlbrd __user *arg)
{
struct stlbrd stl_dummybrd;
struct stlbrd *brdp;
if (copy_from_user(&stl_dummybrd, arg, sizeof(struct stlbrd)))
return -EFAULT;
if (stl_dummybrd.brdnr >= STL_MAXBRDS)
return -ENODEV;
brdp = stl_brds[stl_dummybrd.brdnr];
if (!brdp)
return -ENODEV;
return copy_to_user(arg, brdp, sizeof(struct stlbrd)) ? -EFAULT : 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;
void __user *argp = (void __user *)arg;
pr_debug("stl_memioctl(ip=%p,fp=%p,cmd=%x,arg=%lx)\n", ip, fp, cmd,arg);
brdnr = iminor(ip);
if (brdnr >= STL_MAXBRDS)
return -ENODEV;
rc = 0;
switch (cmd) {
case COM_GETPORTSTATS:
rc = stl_getportstats(NULL, NULL, argp);
break;
case COM_CLRPORTSTATS:
rc = stl_clrportstats(NULL, argp);
break;
case COM_GETBRDSTATS:
rc = stl_getbrdstats(argp);
break;
case COM_READPORT:
rc = stl_getportstruct(argp);
break;
case COM_READBOARD:
rc = stl_getbrdstruct(argp);
break;
default:
rc = -ENOIOCTLCMD;
break;
}
return rc;
}
static const struct tty_operations stl_ops = {
.open = stl_open,
.close = stl_close,
.write = stl_write,
.put_char = stl_putchar,
.flush_chars = stl_flushchars,
.write_room = stl_writeroom,
.chars_in_buffer = stl_charsinbuffer,
.ioctl = stl_ioctl,
.set_termios = stl_settermios,
.throttle = stl_throttle,
.unthrottle = stl_unthrottle,
.stop = stl_stop,
.start = stl_start,
.hangup = stl_hangup,
.flush_buffer = stl_flushbuffer,
.break_ctl = stl_breakctl,
.wait_until_sent = stl_waituntilsent,
.send_xchar = stl_sendxchar,
.tiocmget = stl_tiocmget,
.tiocmset = stl_tiocmset,
.proc_fops = &stl_proc_fops,
};
static const struct tty_port_operations stl_port_ops = {
.carrier_raised = stl_carrier_raised,
.dtr_rts = stl_dtr_rts,
};
/*****************************************************************************/
/* 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(struct stlport *portp, int regnr)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
return inb(portp->ioaddr + EREG_DATA);
}
static void stl_cd1400setreg(struct stlport *portp, int regnr, int value)
{
outb(regnr + portp->uartaddr, portp->ioaddr);
outb(value, portp->ioaddr + EREG_DATA);
}
static int stl_cd1400updatereg(struct stlport *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(struct stlbrd *brdp, struct stlpanel *panelp)
{
unsigned int gfrcr;
int chipmask, i, j;
int nrchips, uartaddr, ioaddr;
unsigned long flags;
pr_debug("stl_panelinit(brdp=%p,panelp=%p)\n", brdp, panelp);
spin_lock_irqsave(&brd_lock, flags);
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=%d\n",
panelp->brdnr, panelp->panelnr, i);
continue;
}
chipmask |= (0x1 << i);
outb((PPR + uartaddr), ioaddr);
outb(PPR_SCALAR, (ioaddr + EREG_DATA));
}
BRDDISABLE(panelp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
return chipmask;
}
/*****************************************************************************/
/*
* Initialize hardware specific port registers.
*/
static void stl_cd1400portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp)
{
unsigned long flags;
pr_debug("stl_cd1400portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
panelp, portp);
if ((brdp == NULL) || (panelp == NULL) ||
(portp == NULL))
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* 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(struct stlport *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=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
}
/*****************************************************************************/
/*
* Set up the cd1400 registers for a port based on the termios port
* settings.
*/
static void stl_cd1400setport(struct stlport *portp, struct ktermios *tiosp)
{
struct stlbrd *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 == 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->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->port.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->port.flags |= ASYNC_CHECK_CD;
} else
portp->port.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.
*/
pr_debug("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
pr_debug(" cor1=%x cor2=%x cor3=%x cor4=%x cor5=%x\n",
cor1, cor2, cor3, cor4, cor5);
pr_debug(" mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%x\n",
mcor1, mcor2, rtpr, sreron, sreroff);
pr_debug(" tcor=%x tbpr=%x rcor=%x rbpr=%x\n", clk, div, clk, div);
pr_debug(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_cd1400setsignals(struct stlport *portp, int dtr, int rts)
{
unsigned char msvr1, msvr2;
unsigned long flags;
pr_debug("stl_cd1400setsignals(portp=%p,dtr=%d,rts=%d)\n",
portp, dtr, rts);
msvr1 = 0;
msvr2 = 0;
if (dtr > 0)
msvr1 = MSVR1_DTR;
if (rts > 0)
msvr2 = MSVR2_RTS;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_cd1400getsignals(struct stlport *portp)
{
unsigned char msvr1, msvr2;
unsigned long flags;
int sigs;
pr_debug("stl_cd1400getsignals(portp=%p)\n", portp);
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, 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(struct stlport *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
pr_debug("stl_cd1400enablerxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
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;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_cd1400startrxtx(struct stlport *portp, int rx, int tx)
{
unsigned char sreron, sreroff;
unsigned long flags;
pr_debug("stl_cd1400startrxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
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;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_cd1400disableintrs(struct stlport *portp)
{
unsigned long flags;
pr_debug("stl_cd1400disableintrs(portp=%p)\n", portp);
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER, 0);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_cd1400sendbreak(struct stlport *portp, int len)
{
unsigned long flags;
pr_debug("stl_cd1400sendbreak(portp=%p,len=%d)\n", portp, len);
spin_lock_irqsave(&brd_lock, flags);
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++;
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_cd1400flowctrl(struct stlport *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
pr_debug("stl_cd1400flowctrl(portp=%p,state=%x)\n", portp, state);
if (portp == NULL)
return;
tty = tty_port_tty_get(&portp->port);
if (tty == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
tty_kref_put(tty);
}
/*****************************************************************************/
/*
* Send a flow control character...
*/
static void stl_cd1400sendflow(struct stlport *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
pr_debug("stl_cd1400sendflow(portp=%p,state=%x)\n", portp, state);
if (portp == NULL)
return;
tty = tty_port_tty_get(&portp->port);
if (tty == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
tty_kref_put(tty);
}
/*****************************************************************************/
static void stl_cd1400flush(struct stlport *portp)
{
unsigned long flags;
pr_debug("stl_cd1400flush(portp=%p)\n", portp);
if (portp == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, 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(struct stlport *portp)
{
pr_debug("stl_cd1400datastate(portp=%p)\n", portp);
if (portp == NULL)
return 0;
return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 EasyIO boards.
*/
static void stl_cd1400eiointr(struct stlpanel *panelp, unsigned int iobase)
{
unsigned char svrtype;
pr_debug("stl_cd1400eiointr(panelp=%p,iobase=%x)\n", panelp, iobase);
spin_lock(&brd_lock);
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);
spin_unlock(&brd_lock);
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 panels.
*/
static void stl_cd1400echintr(struct stlpanel *panelp, unsigned int iobase)
{
unsigned char svrtype;
pr_debug("stl_cd1400echintr(panelp=%p,iobase=%x)\n", panelp, iobase);
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 int stl_cd1400breakisr(struct stlport *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(struct stlpanel *panelp, int ioaddr)
{
struct stlport *portp;
int len, stlen;
char *head, *tail;
unsigned char ioack, srer;
struct tty_struct *tty;
pr_debug("stl_cd1400txisr(panelp=%p,ioaddr=%x)\n", panelp, ioaddr);
ioack = inb(ioaddr + EREG_TXACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
printk("STALLION: bad TX interrupt ack value=%x\n", 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);
tty = tty_port_tty_get(&portp->port);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
}
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_t(unsigned int, 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(struct stlpanel *panelp, int ioaddr)
{
struct stlport *portp;
struct tty_struct *tty;
unsigned int ioack, len, buflen;
unsigned char status;
char ch;
pr_debug("stl_cd1400rxisr(panelp=%p,ioaddr=%x)\n", panelp, ioaddr);
ioack = inb(ioaddr + EREG_RXACK);
if ((ioack & panelp->ackmask) != 0) {
printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
tty = tty_port_tty_get(&portp->port);
if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
outb((RDCR + portp->uartaddr), ioaddr);
len = inb(ioaddr + EREG_DATA);
if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
len = min_t(unsigned int, 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) {
unsigned char *ptr;
outb((RDSR + portp->uartaddr), ioaddr);
tty_prepare_flip_string(tty, &ptr, len);
insb((ioaddr + EREG_DATA), ptr, 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 != NULL && (portp->rxignoremsk & status) == 0) {
if (portp->rxmarkmsk & status) {
if (status & ST_BREAK) {
status = TTY_BREAK;
if (portp->port.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;
tty_insert_flip_char(tty, ch, status);
tty_schedule_flip(tty);
}
} else {
printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
tty_kref_put(tty);
return;
}
stl_rxalldone:
tty_kref_put(tty);
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(struct stlpanel *panelp, int ioaddr)
{
struct stlport *portp;
unsigned int ioack;
unsigned char misr;
pr_debug("stl_cd1400mdmisr(panelp=%p)\n", panelp);
ioack = inb(ioaddr + EREG_MDACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
printk("STALLION: bad MODEM interrupt ack value=%x\n", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
outb((MISR + portp->uartaddr), ioaddr);
misr = inb(ioaddr + EREG_DATA);
if (misr & MISR_DCD) {
stl_cd_change(portp);
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(struct stlport *portp, int regnr)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
return inb(portp->ioaddr + XP_DATA);
}
static void stl_sc26198setreg(struct stlport *portp, int regnr, int value)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
outb(value, (portp->ioaddr + XP_DATA));
}
static int stl_sc26198updatereg(struct stlport *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(struct stlport *portp, int regnr)
{
outb(regnr, (portp->ioaddr + XP_ADDR));
return inb(portp->ioaddr + XP_DATA);
}
#if 0
static void stl_sc26198setglobreg(struct stlport *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(struct stlbrd *brdp, struct stlpanel *panelp)
{
int chipmask, i;
int nrchips, ioaddr;
pr_debug("stl_sc26198panelinit(brdp=%p,panelp=%p)\n", brdp, panelp);
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=%d\n",
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(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp)
{
pr_debug("stl_sc26198portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
panelp, portp);
if ((brdp == NULL) || (panelp == NULL) ||
(portp == 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(struct stlport *portp, struct ktermios *tiosp)
{
struct stlbrd *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 == 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->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->port.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->port.flags &= ~ASYNC_CHECK_CD;
} else {
iopr |= IOPR_DCDCOS;
imron |= IR_IOPORT;
portp->port.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.
*/
pr_debug("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
pr_debug(" mr0=%x mr1=%x mr2=%x clk=%x\n", mr0, mr1, mr2, clk);
pr_debug(" iopr=%x imron=%x imroff=%x\n", iopr, imron, imroff);
pr_debug(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_sc26198setsignals(struct stlport *portp, int dtr, int rts)
{
unsigned char iopioron, iopioroff;
unsigned long flags;
pr_debug("stl_sc26198setsignals(portp=%p,dtr=%d,rts=%d)\n", portp,
dtr, rts);
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;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IOPIOR,
((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_sc26198getsignals(struct stlport *portp)
{
unsigned char ipr;
unsigned long flags;
int sigs;
pr_debug("stl_sc26198getsignals(portp=%p)\n", portp);
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
ipr = stl_sc26198getreg(portp, IPR);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, 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(struct stlport *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
pr_debug("stl_sc26198enablerxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx,tx);
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;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, SCCR, ccr);
BRDDISABLE(portp->brdnr);
portp->crenable = ccr;
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_sc26198startrxtx(struct stlport *portp, int rx, int tx)
{
unsigned char imr;
unsigned long flags;
pr_debug("stl_sc26198startrxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
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;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_sc26198disableintrs(struct stlport *portp)
{
unsigned long flags;
pr_debug("stl_sc26198disableintrs(portp=%p)\n", portp);
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
portp->imr = 0;
stl_sc26198setreg(portp, IMR, 0);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_sc26198sendbreak(struct stlport *portp, int len)
{
unsigned long flags;
pr_debug("stl_sc26198sendbreak(portp=%p,len=%d)\n", portp, len);
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_sc26198flowctrl(struct stlport *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
pr_debug("stl_sc26198flowctrl(portp=%p,state=%x)\n", portp, state);
if (portp == NULL)
return;
tty = tty_port_tty_get(&portp->port);
if (tty == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
tty_kref_put(tty);
}
/*****************************************************************************/
/*
* Send a flow control character.
*/
static void stl_sc26198sendflow(struct stlport *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
pr_debug("stl_sc26198sendflow(portp=%p,state=%x)\n", portp, state);
if (portp == NULL)
return;
tty = tty_port_tty_get(&portp->port);
if (tty == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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);
spin_unlock_irqrestore(&brd_lock, flags);
tty_kref_put(tty);
}
/*****************************************************************************/
static void stl_sc26198flush(struct stlport *portp)
{
unsigned long flags;
pr_debug("stl_sc26198flush(portp=%p)\n", portp);
if (portp == NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
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;
spin_unlock_irqrestore(&brd_lock, 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(struct stlport *portp)
{
unsigned long flags;
unsigned char sr;
pr_debug("stl_sc26198datastate(portp=%p)\n", portp);
if (portp == NULL)
return 0;
if (test_bit(ASYI_TXBUSY, &portp->istate))
return 1;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
sr = stl_sc26198getreg(portp, SR);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, 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(struct stlport *portp)
{
int i;
pr_debug("stl_sc26198wait(portp=%p)\n", portp);
if (portp == 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 void stl_sc26198txunflow(struct stlport *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(struct stlpanel *panelp, unsigned int iobase)
{
struct stlport *portp;
unsigned int iack;
spin_lock(&brd_lock);
/*
* 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);
spin_unlock(&brd_lock);
}
/*****************************************************************************/
/*
* 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(struct stlport *portp)
{
struct tty_struct *tty;
unsigned int ioaddr;
unsigned char mr0;
int len, stlen;
char *head, *tail;
pr_debug("stl_sc26198txisr(portp=%p)\n", portp);
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);
tty = tty_port_tty_get(&portp->port);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
}
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_t(unsigned int, 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(struct stlport *portp, unsigned int iack)
{
struct tty_struct *tty;
unsigned int len, buflen, ioaddr;
pr_debug("stl_sc26198rxisr(portp=%p,iack=%x)\n", portp, iack);
tty = tty_port_tty_get(&portp->port);
ioaddr = portp->ioaddr;
outb(GIBCR, (ioaddr + XP_ADDR));
len = inb(ioaddr + XP_DATA) + 1;
if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
len = min_t(unsigned int, 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) {
unsigned char *ptr;
outb(GRXFIFO, (ioaddr + XP_ADDR));
tty_prepare_flip_string(tty, &ptr, len);
insb((ioaddr + XP_DATA), ptr, 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 != NULL) &&
(tty->termios != NULL) &&
(tty->termios->c_iflag & IXANY)) {
stl_sc26198txunflow(portp, tty);
}
}
tty_kref_put(tty);
}
/*****************************************************************************/
/*
* Process an RX bad character.
*/
static void stl_sc26198rxbadch(struct stlport *portp, unsigned char status, char ch)
{
struct tty_struct *tty;
unsigned int ioaddr;
tty = tty_port_tty_get(&portp->port);
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 != NULL) &&
((portp->rxignoremsk & status) == 0)) {
if (portp->rxmarkmsk & status) {
if (status & SR_RXBREAK) {
status = TTY_BREAK;
if (portp->port.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;
tty_insert_flip_char(tty, ch, status);
tty_schedule_flip(tty);
if (status == 0)
portp->stats.rxtotal++;
}
tty_kref_put(tty);
}
/*****************************************************************************/
/*
* 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(struct stlport *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(struct stlport *portp, unsigned int iack)
{
unsigned char cir, ipr, xisr;
pr_debug("stl_sc26198otherisr(portp=%p,iack=%x)\n", portp, iack);
cir = stl_sc26198getglobreg(portp, CIR);
switch (cir & CIR_SUBTYPEMASK) {
case CIR_SUBCOS:
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCDCHANGE) {
stl_cd_change(portp);
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;
}
}
static void stl_free_isabrds(void)
{
struct stlbrd *brdp;
unsigned int i;
for (i = 0; i < stl_nrbrds; i++) {
if ((brdp = stl_brds[i]) == NULL || (brdp->state & STL_PROBED))
continue;
free_irq(brdp->irq, brdp);
stl_cleanup_panels(brdp);
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
kfree(brdp);
stl_brds[i] = NULL;
}
}
/*
* Loadable module initialization stuff.
*/
static int __init stallion_module_init(void)
{
struct stlbrd *brdp;
struct stlconf conf;
unsigned int i, j;
int retval;
printk(KERN_INFO "%s: version %s\n", stl_drvtitle, stl_drvversion);
spin_lock_init(&stallion_lock);
spin_lock_init(&brd_lock);
stl_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
if (!stl_serial) {
retval = -ENOMEM;
goto err;
}
stl_serial->owner = THIS_MODULE;
stl_serial->driver_name = stl_drvname;
stl_serial->name = "ttyE";
stl_serial->major = STL_SERIALMAJOR;
stl_serial->minor_start = 0;
stl_serial->type = TTY_DRIVER_TYPE_SERIAL;
stl_serial->subtype = SERIAL_TYPE_NORMAL;
stl_serial->init_termios = stl_deftermios;
stl_serial->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty_set_operations(stl_serial, &stl_ops);
retval = tty_register_driver(stl_serial);
if (retval) {
printk("STALLION: failed to register serial driver\n");
goto err_frtty;
}
/*
* Find any dynamically supported boards. That is via module load
* line options.
*/
for (i = stl_nrbrds; i < stl_nargs; i++) {
memset(&conf, 0, sizeof(conf));
if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
continue;
if ((brdp = stl_allocbrd()) == NULL)
continue;
brdp->brdnr = i;
brdp->brdtype = conf.brdtype;
brdp->ioaddr1 = conf.ioaddr1;
brdp->ioaddr2 = conf.ioaddr2;
brdp->irq = conf.irq;
brdp->irqtype = conf.irqtype;
stl_brds[brdp->brdnr] = brdp;
if (stl_brdinit(brdp)) {
stl_brds[brdp->brdnr] = NULL;
kfree(brdp);
} else {
for (j = 0; j < brdp->nrports; j++)
tty_register_device(stl_serial,
brdp->brdnr * STL_MAXPORTS + j, NULL);
stl_nrbrds = i + 1;
}
}
/* this has to be _after_ isa finding because of locking */
retval = pci_register_driver(&stl_pcidriver);
if (retval && stl_nrbrds == 0) {
printk(KERN_ERR "STALLION: can't register pci driver\n");
goto err_unrtty;
}
/*
* Set up a character driver for per board stuff. This is mainly used
* to do stats ioctls on the ports.
*/
if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
printk("STALLION: failed to register serial board device\n");
stallion_class = class_create(THIS_MODULE, "staliomem");
if (IS_ERR(stallion_class))
printk("STALLION: failed to create class\n");
for (i = 0; i < 4; i++)
device_create(stallion_class, NULL, MKDEV(STL_SIOMEMMAJOR, i),
NULL, "staliomem%d", i);
return 0;
err_unrtty:
tty_unregister_driver(stl_serial);
err_frtty:
put_tty_driver(stl_serial);
err:
return retval;
}
static void __exit stallion_module_exit(void)
{
struct stlbrd *brdp;
unsigned int i, j;
pr_debug("cleanup_module()\n");
printk(KERN_INFO "Unloading %s: version %s\n", stl_drvtitle,
stl_drvversion);
/*
* Free up all allocated resources used by the ports. This includes
* memory and interrupts. As part of this process we will also do
* a hangup on every open port - to try to flush out any processes
* hanging onto ports.
*/
for (i = 0; i < stl_nrbrds; i++) {
if ((brdp = stl_brds[i]) == NULL || (brdp->state & STL_PROBED))
continue;
for (j = 0; j < brdp->nrports; j++)
tty_unregister_device(stl_serial,
brdp->brdnr * STL_MAXPORTS + j);
}
for (i = 0; i < 4; i++)
device_destroy(stallion_class, MKDEV(STL_SIOMEMMAJOR, i));
unregister_chrdev(STL_SIOMEMMAJOR, "staliomem");
class_destroy(stallion_class);
pci_unregister_driver(&stl_pcidriver);
stl_free_isabrds();
tty_unregister_driver(stl_serial);
put_tty_driver(stl_serial);
}
module_init(stallion_module_init);
module_exit(stallion_module_exit);
MODULE_AUTHOR("Greg Ungerer");
MODULE_DESCRIPTION("Stallion Multiport Serial Driver");
MODULE_LICENSE("GPL");
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