stallion.c

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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/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];

/*
 *	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_DCDCHANGE	3
#define	ASYI_TXFLOWED	4

/*
 *	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 stlport *portp, comstats_t __user *cp);
static int	stl_clrportstats(struct stlport *portp, comstats_t __user *cp);
static int	stl_waitcarrier(struct stlport *portp, struct file *filp);

/*
 *	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)

/*****************************************************************************/

/*