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rocket.c
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/*
* RocketPort device driver for Linux
*
* Written by Theodore Ts'o, 1995, 1996, 1997, 1998, 1999, 2000.
*
* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2003 by Comtrol, Inc.
*
* 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.
*/
/*
* Kernel Synchronization:
*
* This driver has 2 kernel control paths - exception handlers (calls into the driver
* from user mode) and the timer bottom half (tasklet). This is a polled driver, interrupts
* are not used.
*
* Critical data:
* - rp_table[], accessed through passed "info" pointers, is a global (static) array of
* serial port state information and the xmit_buf circular buffer. Protected by
* a per port spinlock.
* - xmit_flags[], an array of ints indexed by line (port) number, indicating that there
* is data to be transmitted. Protected by atomic bit operations.
* - rp_num_ports, int indicating number of open ports, protected by atomic operations.
*
* rp_write() and rp_write_char() functions use a per port semaphore to protect against
* simultaneous access to the same port by more than one process.
*/
/****** Defines ******/
#ifdef PCI_NUM_RESOURCES
#define PCI_BASE_ADDRESS(dev, r) ((dev)->resource[r].start)
#else
#define PCI_BASE_ADDRESS(dev, r) ((dev)->base_address[r])
#endif
#define ROCKET_PARANOIA_CHECK
#define ROCKET_DISABLE_SIMUSAGE
#undef ROCKET_SOFT_FLOW
#undef ROCKET_DEBUG_OPEN
#undef ROCKET_DEBUG_INTR
#undef ROCKET_DEBUG_WRITE
#undef ROCKET_DEBUG_FLOW
#undef ROCKET_DEBUG_THROTTLE
#undef ROCKET_DEBUG_WAIT_UNTIL_SENT
#undef ROCKET_DEBUG_RECEIVE
#undef ROCKET_DEBUG_HANGUP
#undef REV_PCI_ORDER
#undef ROCKET_DEBUG_IO
#define POLL_PERIOD HZ/100 /* Polling period .01 seconds (10ms) */
/****** Kernel includes ******/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/major.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/mutex.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/init.h>
/****** RocketPort includes ******/
#include "rocket_int.h"
#include "rocket.h"
#define ROCKET_VERSION "2.09"
#define ROCKET_DATE "12-June-2003"
/****** RocketPort Local Variables ******/
static void rp_do_poll(unsigned long dummy);
static struct tty_driver *rocket_driver;
static struct rocket_version driver_version = {
ROCKET_VERSION, ROCKET_DATE
};
static struct r_port *rp_table[MAX_RP_PORTS]; /* The main repository of serial port state information. */
static unsigned int xmit_flags[NUM_BOARDS]; /* Bit significant, indicates port had data to transmit. */
/* eg. Bit 0 indicates port 0 has xmit data, ... */
static atomic_t rp_num_ports_open; /* Number of serial ports open */
static DEFINE_TIMER(rocket_timer, rp_do_poll, 0, 0);
static unsigned long board1; /* ISA addresses, retrieved from rocketport.conf */
static unsigned long board2;
static unsigned long board3;
static unsigned long board4;
static unsigned long controller;
static int support_low_speed;
static unsigned long modem1;
static unsigned long modem2;
static unsigned long modem3;
static unsigned long modem4;
static unsigned long pc104_1[8];
static unsigned long pc104_2[8];
static unsigned long pc104_3[8];
static unsigned long pc104_4[8];
static unsigned long *pc104[4] = { pc104_1, pc104_2, pc104_3, pc104_4 };
static int rp_baud_base[NUM_BOARDS]; /* Board config info (Someday make a per-board structure) */
static unsigned long rcktpt_io_addr[NUM_BOARDS];
static int rcktpt_type[NUM_BOARDS];
static int is_PCI[NUM_BOARDS];
static rocketModel_t rocketModel[NUM_BOARDS];
static int max_board;
/*
* The following arrays define the interrupt bits corresponding to each AIOP.
* These bits are different between the ISA and regular PCI boards and the
* Universal PCI boards.
*/
static Word_t aiop_intr_bits[AIOP_CTL_SIZE] = {
AIOP_INTR_BIT_0,
AIOP_INTR_BIT_1,
AIOP_INTR_BIT_2,
AIOP_INTR_BIT_3
};
static Word_t upci_aiop_intr_bits[AIOP_CTL_SIZE] = {
UPCI_AIOP_INTR_BIT_0,
UPCI_AIOP_INTR_BIT_1,
UPCI_AIOP_INTR_BIT_2,
UPCI_AIOP_INTR_BIT_3
};
static Byte_t RData[RDATASIZE] = {
0x00, 0x09, 0xf6, 0x82,
0x02, 0x09, 0x86, 0xfb,
0x04, 0x09, 0x00, 0x0a,
0x06, 0x09, 0x01, 0x0a,
0x08, 0x09, 0x8a, 0x13,
0x0a, 0x09, 0xc5, 0x11,
0x0c, 0x09, 0x86, 0x85,
0x0e, 0x09, 0x20, 0x0a,
0x10, 0x09, 0x21, 0x0a,
0x12, 0x09, 0x41, 0xff,
0x14, 0x09, 0x82, 0x00,
0x16, 0x09, 0x82, 0x7b,
0x18, 0x09, 0x8a, 0x7d,
0x1a, 0x09, 0x88, 0x81,
0x1c, 0x09, 0x86, 0x7a,
0x1e, 0x09, 0x84, 0x81,
0x20, 0x09, 0x82, 0x7c,
0x22, 0x09, 0x0a, 0x0a
};
static Byte_t RRegData[RREGDATASIZE] = {
0x00, 0x09, 0xf6, 0x82, /* 00: Stop Rx processor */
0x08, 0x09, 0x8a, 0x13, /* 04: Tx software flow control */
0x0a, 0x09, 0xc5, 0x11, /* 08: XON char */
0x0c, 0x09, 0x86, 0x85, /* 0c: XANY */
0x12, 0x09, 0x41, 0xff, /* 10: Rx mask char */
0x14, 0x09, 0x82, 0x00, /* 14: Compare/Ignore #0 */
0x16, 0x09, 0x82, 0x7b, /* 18: Compare #1 */
0x18, 0x09, 0x8a, 0x7d, /* 1c: Compare #2 */
0x1a, 0x09, 0x88, 0x81, /* 20: Interrupt #1 */
0x1c, 0x09, 0x86, 0x7a, /* 24: Ignore/Replace #1 */
0x1e, 0x09, 0x84, 0x81, /* 28: Interrupt #2 */
0x20, 0x09, 0x82, 0x7c, /* 2c: Ignore/Replace #2 */
0x22, 0x09, 0x0a, 0x0a /* 30: Rx FIFO Enable */
};
static CONTROLLER_T sController[CTL_SIZE] = {
{-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
{0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
{-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
{0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
{-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
{0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
{-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
{0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}}
};
static Byte_t sBitMapClrTbl[8] = {
0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f
};
static Byte_t sBitMapSetTbl[8] = {
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
};
static int sClockPrescale = 0x14;
/*
* Line number is the ttySIx number (x), the Minor number. We
* assign them sequentially, starting at zero. The following
* array keeps track of the line number assigned to a given board/aiop/channel.
*/
static unsigned char lineNumbers[MAX_RP_PORTS];
static unsigned long nextLineNumber;
/***** RocketPort Static Prototypes *********/
static int __init init_ISA(int i);
static void rp_wait_until_sent(struct tty_struct *tty, int timeout);
static void rp_flush_buffer(struct tty_struct *tty);
static void rmSpeakerReset(CONTROLLER_T * CtlP, unsigned long model);
static unsigned char GetLineNumber(int ctrl, int aiop, int ch);
static unsigned char SetLineNumber(int ctrl, int aiop, int ch);
static void rp_start(struct tty_struct *tty);
static int sInitChan(CONTROLLER_T * CtlP, CHANNEL_T * ChP, int AiopNum,
int ChanNum);
static void sSetInterfaceMode(CHANNEL_T * ChP, Byte_t mode);
static void sFlushRxFIFO(CHANNEL_T * ChP);
static void sFlushTxFIFO(CHANNEL_T * ChP);
static void sEnInterrupts(CHANNEL_T * ChP, Word_t Flags);
static void sDisInterrupts(CHANNEL_T * ChP, Word_t Flags);
static void sModemReset(CONTROLLER_T * CtlP, int chan, int on);
static void sPCIModemReset(CONTROLLER_T * CtlP, int chan, int on);
static int sWriteTxPrioByte(CHANNEL_T * ChP, Byte_t Data);
static int sPCIInitController(CONTROLLER_T * CtlP, int CtlNum,
ByteIO_t * AiopIOList, int AiopIOListSize,
WordIO_t ConfigIO, int IRQNum, Byte_t Frequency,
int PeriodicOnly, int altChanRingIndicator,
int UPCIRingInd);
static int sInitController(CONTROLLER_T * CtlP, int CtlNum, ByteIO_t MudbacIO,
ByteIO_t * AiopIOList, int AiopIOListSize,
int IRQNum, Byte_t Frequency, int PeriodicOnly);
static int sReadAiopID(ByteIO_t io);
static int sReadAiopNumChan(WordIO_t io);
MODULE_AUTHOR("Theodore Ts'o");
MODULE_DESCRIPTION("Comtrol RocketPort driver");
module_param(board1, ulong, 0);
MODULE_PARM_DESC(board1, "I/O port for (ISA) board #1");
module_param(board2, ulong, 0);
MODULE_PARM_DESC(board2, "I/O port for (ISA) board #2");
module_param(board3, ulong, 0);
MODULE_PARM_DESC(board3, "I/O port for (ISA) board #3");
module_param(board4, ulong, 0);
MODULE_PARM_DESC(board4, "I/O port for (ISA) board #4");
module_param(controller, ulong, 0);
MODULE_PARM_DESC(controller, "I/O port for (ISA) rocketport controller");
module_param(support_low_speed, bool, 0);
MODULE_PARM_DESC(support_low_speed, "1 means support 50 baud, 0 means support 460400 baud");
module_param(modem1, ulong, 0);
MODULE_PARM_DESC(modem1, "1 means (ISA) board #1 is a RocketModem");
module_param(modem2, ulong, 0);
MODULE_PARM_DESC(modem2, "1 means (ISA) board #2 is a RocketModem");
module_param(modem3, ulong, 0);
MODULE_PARM_DESC(modem3, "1 means (ISA) board #3 is a RocketModem");
module_param(modem4, ulong, 0);
MODULE_PARM_DESC(modem4, "1 means (ISA) board #4 is a RocketModem");
module_param_array(pc104_1, ulong, NULL, 0);
MODULE_PARM_DESC(pc104_1, "set interface types for ISA(PC104) board #1 (e.g. pc104_1=232,232,485,485,...");
module_param_array(pc104_2, ulong, NULL, 0);
MODULE_PARM_DESC(pc104_2, "set interface types for ISA(PC104) board #2 (e.g. pc104_2=232,232,485,485,...");
module_param_array(pc104_3, ulong, NULL, 0);
MODULE_PARM_DESC(pc104_3, "set interface types for ISA(PC104) board #3 (e.g. pc104_3=232,232,485,485,...");
module_param_array(pc104_4, ulong, NULL, 0);
MODULE_PARM_DESC(pc104_4, "set interface types for ISA(PC104) board #4 (e.g. pc104_4=232,232,485,485,...");
static int rp_init(void);
static void rp_cleanup_module(void);
module_init(rp_init);
module_exit(rp_cleanup_module);
MODULE_LICENSE("Dual BSD/GPL");
/*************************************************************************/
/* Module code starts here */
static inline int rocket_paranoia_check(struct r_port *info,
const char *routine)
{
#ifdef ROCKET_PARANOIA_CHECK
if (!info)
return 1;
if (info->magic != RPORT_MAGIC) {
printk(KERN_INFO "Warning: bad magic number for rocketport struct in %s\n",
routine);
return 1;
}
#endif
return 0;
}
/* Serial port receive data function. Called (from timer poll) when an AIOPIC signals
* that receive data is present on a serial port. Pulls data from FIFO, moves it into the
* tty layer.
*/
static void rp_do_receive(struct r_port *info,
struct tty_struct *tty,
CHANNEL_t * cp, unsigned int ChanStatus)
{
unsigned int CharNStat;
int ToRecv, wRecv, space;
unsigned char *cbuf;
ToRecv = sGetRxCnt(cp);
#ifdef ROCKET_DEBUG_INTR
printk(KERN_INFO "rp_do_receive(%d)...", ToRecv);
#endif
if (ToRecv == 0)
return;
/*
* if status indicates there are errored characters in the
* FIFO, then enter status mode (a word in FIFO holds
* character and status).
*/
if (ChanStatus & (RXFOVERFL | RXBREAK | RXFRAME | RXPARITY)) {
if (!(ChanStatus & STATMODE)) {
#ifdef ROCKET_DEBUG_RECEIVE
printk(KERN_INFO "Entering STATMODE...");
#endif
ChanStatus |= STATMODE;
sEnRxStatusMode(cp);
}
}
/*
* if we previously entered status mode, then read down the
* FIFO one word at a time, pulling apart the character and
* the status. Update error counters depending on status
*/
if (ChanStatus & STATMODE) {
#ifdef ROCKET_DEBUG_RECEIVE
printk(KERN_INFO "Ignore %x, read %x...", info->ignore_status_mask,
info->read_status_mask);
#endif
while (ToRecv) {
char flag;
CharNStat = sInW(sGetTxRxDataIO(cp));
#ifdef ROCKET_DEBUG_RECEIVE
printk(KERN_INFO "%x...", CharNStat);
#endif
if (CharNStat & STMBREAKH)
CharNStat &= ~(STMFRAMEH | STMPARITYH);
if (CharNStat & info->ignore_status_mask) {
ToRecv--;
continue;
}
CharNStat &= info->read_status_mask;
if (CharNStat & STMBREAKH)
flag = TTY_BREAK;
else if (CharNStat & STMPARITYH)
flag = TTY_PARITY;
else if (CharNStat & STMFRAMEH)
flag = TTY_FRAME;
else if (CharNStat & STMRCVROVRH)
flag = TTY_OVERRUN;
else
flag = TTY_NORMAL;
tty_insert_flip_char(tty, CharNStat & 0xff, flag);
ToRecv--;
}
/*
* after we've emptied the FIFO in status mode, turn
* status mode back off
*/
if (sGetRxCnt(cp) == 0) {
#ifdef ROCKET_DEBUG_RECEIVE
printk(KERN_INFO "Status mode off.\n");
#endif
sDisRxStatusMode(cp);
}
} else {
/*
* we aren't in status mode, so read down the FIFO two
* characters at time by doing repeated word IO
* transfer.
*/
space = tty_prepare_flip_string(tty, &cbuf, ToRecv);
if (space < ToRecv) {
#ifdef ROCKET_DEBUG_RECEIVE
printk(KERN_INFO "rp_do_receive:insufficient space ToRecv=%d space=%d\n", ToRecv, space);
#endif
if (space <= 0)
return;
ToRecv = space;
}
wRecv = ToRecv >> 1;
if (wRecv)
sInStrW(sGetTxRxDataIO(cp), (unsigned short *) cbuf, wRecv);
if (ToRecv & 1)
cbuf[ToRecv - 1] = sInB(sGetTxRxDataIO(cp));
}
/* Push the data up to the tty layer */
tty_flip_buffer_push(tty);
}
/*
* Serial port transmit data function. Called from the timer polling loop as a
* result of a bit set in xmit_flags[], indicating data (from the tty layer) is ready
* to be sent out the serial port. Data is buffered in rp_table[line].xmit_buf, it is
* moved to the port's xmit FIFO. *info is critical data, protected by spinlocks.
*/
static void rp_do_transmit(struct r_port *info)
{
int c;
CHANNEL_t *cp = &info->channel;
struct tty_struct *tty;
unsigned long flags;
#ifdef ROCKET_DEBUG_INTR
printk(KERN_INFO "rp_do_transmit ");
#endif
if (!info)
return;
if (!info->tty) {
printk(KERN_INFO "rp: WARNING rp_do_transmit called with info->tty==NULL\n");
clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
return;
}
spin_lock_irqsave(&info->slock, flags);
tty = info->tty;
info->xmit_fifo_room = TXFIFO_SIZE - sGetTxCnt(cp);
/* Loop sending data to FIFO until done or FIFO full */
while (1) {
if (tty->stopped || tty->hw_stopped)
break;
c = min(info->xmit_fifo_room, min(info->xmit_cnt, XMIT_BUF_SIZE - info->xmit_tail));
if (c <= 0 || info->xmit_fifo_room <= 0)
break;
sOutStrW(sGetTxRxDataIO(cp), (unsigned short *) (info->xmit_buf + info->xmit_tail), c / 2);
if (c & 1)
sOutB(sGetTxRxDataIO(cp), info->xmit_buf[info->xmit_tail + c - 1]);
info->xmit_tail += c;
info->xmit_tail &= XMIT_BUF_SIZE - 1;
info->xmit_cnt -= c;
info->xmit_fifo_room -= c;
#ifdef ROCKET_DEBUG_INTR
printk(KERN_INFO "tx %d chars...", c);
#endif
}
if (info->xmit_cnt == 0)
clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
if (info->xmit_cnt < WAKEUP_CHARS) {
tty_wakeup(tty);
#ifdef ROCKETPORT_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
}
spin_unlock_irqrestore(&info->slock, flags);
#ifdef ROCKET_DEBUG_INTR
printk(KERN_INFO "(%d,%d,%d,%d)...", info->xmit_cnt, info->xmit_head,
info->xmit_tail, info->xmit_fifo_room);
#endif
}
/*
* Called when a serial port signals it has read data in it's RX FIFO.
* It checks what interrupts are pending and services them, including
* receiving serial data.
*/
static void rp_handle_port(struct r_port *info)
{
CHANNEL_t *cp;
struct tty_struct *tty;
unsigned int IntMask, ChanStatus;
if (!info)
return;
if ((info->flags & ROCKET_INITIALIZED) == 0) {
printk(KERN_INFO "rp: WARNING: rp_handle_port called with info->flags & NOT_INIT\n");
return;
}
if (!info->tty) {
printk(KERN_INFO "rp: WARNING: rp_handle_port called with info->tty==NULL\n");
return;
}
cp = &info->channel;
tty = info->tty;
IntMask = sGetChanIntID(cp) & info->intmask;
#ifdef ROCKET_DEBUG_INTR
printk(KERN_INFO "rp_interrupt %02x...", IntMask);
#endif
ChanStatus = sGetChanStatus(cp);
if (IntMask & RXF_TRIG) { /* Rx FIFO trigger level */
rp_do_receive(info, tty, cp, ChanStatus);
}
if (IntMask & DELTA_CD) { /* CD change */
#if (defined(ROCKET_DEBUG_OPEN) || defined(ROCKET_DEBUG_INTR) || defined(ROCKET_DEBUG_HANGUP))
printk(KERN_INFO "ttyR%d CD now %s...", info->line,
(ChanStatus & CD_ACT) ? "on" : "off");
#endif
if (!(ChanStatus & CD_ACT) && info->cd_status) {
#ifdef ROCKET_DEBUG_HANGUP
printk(KERN_INFO "CD drop, calling hangup.\n");
#endif
tty_hangup(tty);
}
info->cd_status = (ChanStatus & CD_ACT) ? 1 : 0;
wake_up_interruptible(&info->open_wait);
}
#ifdef ROCKET_DEBUG_INTR
if (IntMask & DELTA_CTS) { /* CTS change */
printk(KERN_INFO "CTS change...\n");
}
if (IntMask & DELTA_DSR) { /* DSR change */
printk(KERN_INFO "DSR change...\n");
}
#endif
}
/*
* The top level polling routine. Repeats every 1/100 HZ (10ms).
*/
static void rp_do_poll(unsigned long dummy)
{
CONTROLLER_t *ctlp;
int ctrl, aiop, ch, line, i;
unsigned int xmitmask;
unsigned int CtlMask;
unsigned char AiopMask;
Word_t bit;
/* Walk through all the boards (ctrl's) */
for (ctrl = 0; ctrl < max_board; ctrl++) {
if (rcktpt_io_addr[ctrl] <= 0)
continue;
/* Get a ptr to the board's control struct */
ctlp = sCtlNumToCtlPtr(ctrl);
/* Get the interupt status from the board */
#ifdef CONFIG_PCI
if (ctlp->BusType == isPCI)
CtlMask = sPCIGetControllerIntStatus(ctlp);
else
#endif
CtlMask = sGetControllerIntStatus(ctlp);
/* Check if any AIOP read bits are set */
for (aiop = 0; CtlMask; aiop++) {
bit = ctlp->AiopIntrBits[aiop];
if (CtlMask & bit) {
CtlMask &= ~bit;
AiopMask = sGetAiopIntStatus(ctlp, aiop);
/* Check if any port read bits are set */
for (ch = 0; AiopMask; AiopMask >>= 1, ch++) {
if (AiopMask & 1) {
/* Get the line number (/dev/ttyRx number). */
/* Read the data from the port. */
line = GetLineNumber(ctrl, aiop, ch);
rp_handle_port(rp_table[line]);
}
}
}
}
xmitmask = xmit_flags[ctrl];
/*
* xmit_flags contains bit-significant flags, indicating there is data
* to xmit on the port. Bit 0 is port 0 on this board, bit 1 is port
* 1, ... (32 total possible). The variable i has the aiop and ch
* numbers encoded in it (port 0-7 are aiop0, 8-15 are aiop1, etc).
*/
if (xmitmask) {
for (i = 0; i < rocketModel[ctrl].numPorts; i++) {
if (xmitmask & (1 << i)) {
aiop = (i & 0x18) >> 3;
ch = i & 0x07;
line = GetLineNumber(ctrl, aiop, ch);
rp_do_transmit(rp_table[line]);
}
}
}
}
/*
* Reset the timer so we get called at the next clock tick (10ms).
*/
if (atomic_read(&rp_num_ports_open))
mod_timer(&rocket_timer, jiffies + POLL_PERIOD);
}
/*
* Initializes the r_port structure for a port, as well as enabling the port on
* the board.
* Inputs: board, aiop, chan numbers
*/
static void init_r_port(int board, int aiop, int chan, struct pci_dev *pci_dev)
{
unsigned rocketMode;
struct r_port *info;
int line;
CONTROLLER_T *ctlp;
/* Get the next available line number */
line = SetLineNumber(board, aiop, chan);
ctlp = sCtlNumToCtlPtr(board);
/* Get a r_port struct for the port, fill it in and save it globally, indexed by line number */
info = kzalloc(sizeof (struct r_port), GFP_KERNEL);
if (!info) {
printk(KERN_INFO "Couldn't allocate info struct for line #%d\n", line);
return;
}
info->magic = RPORT_MAGIC;
info->line = line;
info->ctlp = ctlp;
info->board = board;
info->aiop = aiop;
info->chan = chan;
info->closing_wait = 3000;
info->close_delay = 50;
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
info->flags &= ~ROCKET_MODE_MASK;
switch (pc104[board][line]) {
case 422:
info->flags |= ROCKET_MODE_RS422;
break;
case 485:
info->flags |= ROCKET_MODE_RS485;
break;
case 232:
default:
info->flags |= ROCKET_MODE_RS232;
break;
}
info->intmask = RXF_TRIG | TXFIFO_MT | SRC_INT | DELTA_CD | DELTA_CTS | DELTA_DSR;
if (sInitChan(ctlp, &info->channel, aiop, chan) == 0) {
printk(KERN_INFO "RocketPort sInitChan(%d, %d, %d) failed!\n", board, aiop, chan);
kfree(info);
return;
}
rocketMode = info->flags & ROCKET_MODE_MASK;
if ((info->flags & ROCKET_RTS_TOGGLE) || (rocketMode == ROCKET_MODE_RS485))
sEnRTSToggle(&info->channel);
else
sDisRTSToggle(&info->channel);
if (ctlp->boardType == ROCKET_TYPE_PC104) {
switch (rocketMode) {
case ROCKET_MODE_RS485:
sSetInterfaceMode(&info->channel, InterfaceModeRS485);
break;
case ROCKET_MODE_RS422:
sSetInterfaceMode(&info->channel, InterfaceModeRS422);
break;
case ROCKET_MODE_RS232:
default:
if (info->flags & ROCKET_RTS_TOGGLE)
sSetInterfaceMode(&info->channel, InterfaceModeRS232T);
else
sSetInterfaceMode(&info->channel, InterfaceModeRS232);
break;
}
}
spin_lock_init(&info->slock);
mutex_init(&info->write_mtx);
rp_table[line] = info;
if (pci_dev)
tty_register_device(rocket_driver, line, &pci_dev->dev);
}
/*
* Configures a rocketport port according to its termio settings. Called from
* user mode into the driver (exception handler). *info CD manipulation is spinlock protected.
*/
static void configure_r_port(struct r_port *info,
struct ktermios *old_termios)
{
unsigned cflag;
unsigned long flags;
unsigned rocketMode;
int bits, baud, divisor;
CHANNEL_t *cp;
if (!info->tty || !info->tty->termios)
return;
cp = &info->channel;
cflag = info->tty->termios->c_cflag;
/* Byte size and parity */
if ((cflag & CSIZE) == CS8) {
sSetData8(cp);
bits = 10;
} else {
sSetData7(cp);
bits = 9;
}
if (cflag & CSTOPB) {
sSetStop2(cp);
bits++;
} else {
sSetStop1(cp);
}
if (cflag & PARENB) {
sEnParity(cp);
bits++;
if (cflag & PARODD) {
sSetOddParity(cp);
} else {
sSetEvenParity(cp);
}
} else {
sDisParity(cp);
}
/* baud rate */
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
divisor = ((rp_baud_base[info->board] + (baud >> 1)) / baud) - 1;
if ((divisor >= 8192 || divisor < 0) && old_termios) {
info->tty->termios->c_cflag &= ~CBAUD;
info->tty->termios->c_cflag |=
(old_termios->c_cflag & CBAUD);
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
divisor = (rp_baud_base[info->board] / baud) - 1;
}
if (divisor >= 8192 || divisor < 0) {
baud = 9600;
divisor = (rp_baud_base[info->board] / baud) - 1;
}
info->cps = baud / bits;
sSetBaud(cp, divisor);
if (cflag & CRTSCTS) {
info->intmask |= DELTA_CTS;
sEnCTSFlowCtl(cp);
} else {
info->intmask &= ~DELTA_CTS;
sDisCTSFlowCtl(cp);
}
if (cflag & CLOCAL) {
info->intmask &= ~DELTA_CD;
} else {
spin_lock_irqsave(&info->slock, flags);
if (sGetChanStatus(cp) & CD_ACT)
info->cd_status = 1;
else
info->cd_status = 0;
info->intmask |= DELTA_CD;
spin_unlock_irqrestore(&info->slock, flags);
}
/*
* Handle software flow control in the board
*/
#ifdef ROCKET_SOFT_FLOW
if (I_IXON(info->tty)) {
sEnTxSoftFlowCtl(cp);
if (I_IXANY(info->tty)) {
sEnIXANY(cp);
} else {
sDisIXANY(cp);
}
sSetTxXONChar(cp, START_CHAR(info->tty));
sSetTxXOFFChar(cp, STOP_CHAR(info->tty));
} else {
sDisTxSoftFlowCtl(cp);
sDisIXANY(cp);
sClrTxXOFF(cp);
}
#endif
/*
* Set up ignore/read mask words
*/
info->read_status_mask = STMRCVROVRH | 0xFF;
if (I_INPCK(info->tty))
info->read_status_mask |= STMFRAMEH | STMPARITYH;
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
info->read_status_mask |= STMBREAKH;
/*
* Characters to ignore
*/
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= STMFRAMEH | STMPARITYH;
if (I_IGNBRK(info->tty)) {
info->ignore_status_mask |= STMBREAKH;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too. (For real raw support).
*/
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= STMRCVROVRH;
}
rocketMode = info->flags & ROCKET_MODE_MASK;
if ((info->flags & ROCKET_RTS_TOGGLE)
|| (rocketMode == ROCKET_MODE_RS485))
sEnRTSToggle(cp);
else
sDisRTSToggle(cp);
sSetRTS(&info->channel);
if (cp->CtlP->boardType == ROCKET_TYPE_PC104) {
switch (rocketMode) {
case ROCKET_MODE_RS485:
sSetInterfaceMode(cp, InterfaceModeRS485);
break;
case ROCKET_MODE_RS422:
sSetInterfaceMode(cp, InterfaceModeRS422);
break;
case ROCKET_MODE_RS232:
default:
if (info->flags & ROCKET_RTS_TOGGLE)
sSetInterfaceMode(cp, InterfaceModeRS232T);
else
sSetInterfaceMode(cp, InterfaceModeRS232);
break;
}
}
}
/* info->count is considered critical, protected by spinlocks. */
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct r_port *info)
{
DECLARE_WAITQUEUE(wait, current);
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp))
return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
if (info->flags & ROCKET_CLOSING) {
interruptible_sleep_on(&info->close_wait);
return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
}
/*
* If non-blocking mode is set, or the port is not enabled,
* then make the check up front and then exit.
*/
if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
info->flags |= ROCKET_NORMAL_ACTIVE;
return 0;
}
if (tty->termios->c_cflag & CLOCAL)
do_clocal = 1;
/*
* Block waiting for the carrier detect and the line to become free. While we are in
* this loop, info->count is dropped by one, so that rp_close() knows when to free things.
* We restore it upon exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->open_wait, &wait);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, info->count);
#endif
spin_lock_irqsave(&info->slock, flags);
#ifdef ROCKET_DISABLE_SIMUSAGE
info->flags |= ROCKET_NORMAL_ACTIVE;
#else
if (!tty_hung_up_p(filp)) {
extra_count = 1;
info->count--;
}
#endif
info->blocked_open++;
spin_unlock_irqrestore(&info->slock, flags);
while (1) {
if (tty->termios->c_cflag & CBAUD) {
sSetDTR(&info->channel);
sSetRTS(&info->channel);
}
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->flags & ROCKET_INITIALIZED)) {
if (info->flags & ROCKET_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(info->flags & ROCKET_CLOSING) && (do_clocal || (sGetChanStatusLo(&info->channel) & CD_ACT)))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready blocking: ttyR%d, count = %d, flags=0x%0x\n",
info->line, info->count, info->flags);
#endif
schedule(); /* Don't hold spinlock here, will hang PC */
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
spin_lock_irqsave(&info->slock, flags);
if (extra_count)
info->count++;
info->blocked_open--;
spin_unlock_irqrestore(&info->slock, flags);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
info->line, info->count);
#endif
if (retval)
return retval;
info->flags |= ROCKET_NORMAL_ACTIVE;
return 0;
}
/*
* Exception handler that opens a serial port. Creates xmit_buf storage, fills in
* port's r_port struct. Initializes the port hardware.
*/
static int rp_open(struct tty_struct *tty, struct file *filp)
{
struct r_port *info;
int line = 0, retval;
CHANNEL_t *cp;
unsigned long page;
line = TTY_GET_LINE(tty);
if ((line < 0) || (line >= MAX_RP_PORTS) || ((info = rp_table[line]) == NULL))
return -ENXIO;
page = __get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
if (info->flags & ROCKET_CLOSING) {
interruptible_sleep_on(&info->close_wait);
free_page(page);
return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
}
/*
* We must not sleep from here until the port is marked fully in use.
*/
if (info->xmit_buf)
free_page(page);
else
info->xmit_buf = (unsigned char *) page;
tty->driver_data = info;
info->tty = tty;