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/drivers/char/pcmcia/synclink_cs.c

https://bitbucket.org/wisechild/galaxy-nexus
C | 4311 lines | 2938 code | 672 blank | 701 comment | 620 complexity | 9990b381aff71ea36e28a41ddda3c1f6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0

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   1/*
   2 * linux/drivers/char/pcmcia/synclink_cs.c
   3 *
   4 * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
   5 *
   6 * Device driver for Microgate SyncLink PC Card
   7 * multiprotocol serial adapter.
   8 *
   9 * written by Paul Fulghum for Microgate Corporation
  10 * paulkf@microgate.com
  11 *
  12 * Microgate and SyncLink are trademarks of Microgate Corporation
  13 *
  14 * This code is released under the GNU General Public License (GPL)
  15 *
  16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26 * OF THE POSSIBILITY OF SUCH DAMAGE.
  27 */
  28
  29#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  30#if defined(__i386__)
  31#  define BREAKPOINT() asm("   int $3");
  32#else
  33#  define BREAKPOINT() { }
  34#endif
  35
  36#define MAX_DEVICE_COUNT 4
  37
  38#include <linux/module.h>
  39#include <linux/errno.h>
  40#include <linux/signal.h>
  41#include <linux/sched.h>
  42#include <linux/timer.h>
  43#include <linux/time.h>
  44#include <linux/interrupt.h>
  45#include <linux/tty.h>
  46#include <linux/tty_flip.h>
  47#include <linux/serial.h>
  48#include <linux/major.h>
  49#include <linux/string.h>
  50#include <linux/fcntl.h>
  51#include <linux/ptrace.h>
  52#include <linux/ioport.h>
  53#include <linux/mm.h>
  54#include <linux/seq_file.h>
  55#include <linux/slab.h>
  56#include <linux/netdevice.h>
  57#include <linux/vmalloc.h>
  58#include <linux/init.h>
  59#include <linux/delay.h>
  60#include <linux/ioctl.h>
  61#include <linux/synclink.h>
  62
  63#include <asm/system.h>
  64#include <asm/io.h>
  65#include <asm/irq.h>
  66#include <asm/dma.h>
  67#include <linux/bitops.h>
  68#include <asm/types.h>
  69#include <linux/termios.h>
  70#include <linux/workqueue.h>
  71#include <linux/hdlc.h>
  72
  73#include <pcmcia/cistpl.h>
  74#include <pcmcia/cisreg.h>
  75#include <pcmcia/ds.h>
  76
  77#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  78#define SYNCLINK_GENERIC_HDLC 1
  79#else
  80#define SYNCLINK_GENERIC_HDLC 0
  81#endif
  82
  83#define GET_USER(error,value,addr) error = get_user(value,addr)
  84#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  85#define PUT_USER(error,value,addr) error = put_user(value,addr)
  86#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  87
  88#include <asm/uaccess.h>
  89
  90static MGSL_PARAMS default_params = {
  91	MGSL_MODE_HDLC,			/* unsigned long mode */
  92	0,				/* unsigned char loopback; */
  93	HDLC_FLAG_UNDERRUN_ABORT15,	/* unsigned short flags; */
  94	HDLC_ENCODING_NRZI_SPACE,	/* unsigned char encoding; */
  95	0,				/* unsigned long clock_speed; */
  96	0xff,				/* unsigned char addr_filter; */
  97	HDLC_CRC_16_CCITT,		/* unsigned short crc_type; */
  98	HDLC_PREAMBLE_LENGTH_8BITS,	/* unsigned char preamble_length; */
  99	HDLC_PREAMBLE_PATTERN_NONE,	/* unsigned char preamble; */
 100	9600,				/* unsigned long data_rate; */
 101	8,				/* unsigned char data_bits; */
 102	1,				/* unsigned char stop_bits; */
 103	ASYNC_PARITY_NONE		/* unsigned char parity; */
 104};
 105
 106typedef struct
 107{
 108	int count;
 109	unsigned char status;
 110	char data[1];
 111} RXBUF;
 112
 113/* The queue of BH actions to be performed */
 114
 115#define BH_RECEIVE  1
 116#define BH_TRANSMIT 2
 117#define BH_STATUS   4
 118
 119#define IO_PIN_SHUTDOWN_LIMIT 100
 120
 121#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 122
 123struct _input_signal_events {
 124	int	ri_up;
 125	int	ri_down;
 126	int	dsr_up;
 127	int	dsr_down;
 128	int	dcd_up;
 129	int	dcd_down;
 130	int	cts_up;
 131	int	cts_down;
 132};
 133
 134
 135/*
 136 * Device instance data structure
 137 */
 138
 139typedef struct _mgslpc_info {
 140	struct tty_port		port;
 141	void *if_ptr;	/* General purpose pointer (used by SPPP) */
 142	int			magic;
 143	int			line;
 144
 145	struct mgsl_icount	icount;
 146
 147	int			timeout;
 148	int			x_char;		/* xon/xoff character */
 149	unsigned char		read_status_mask;
 150	unsigned char		ignore_status_mask;
 151
 152	unsigned char *tx_buf;
 153	int            tx_put;
 154	int            tx_get;
 155	int            tx_count;
 156
 157	/* circular list of fixed length rx buffers */
 158
 159	unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 160	int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 161	int            rx_put;         /* index of next empty rx buffer */
 162	int            rx_get;         /* index of next full rx buffer */
 163	int            rx_buf_size;    /* size in bytes of single rx buffer */
 164	int            rx_buf_count;   /* total number of rx buffers */
 165	int            rx_frame_count; /* number of full rx buffers */
 166
 167	wait_queue_head_t	status_event_wait_q;
 168	wait_queue_head_t	event_wait_q;
 169	struct timer_list	tx_timer;	/* HDLC transmit timeout timer */
 170	struct _mgslpc_info	*next_device;	/* device list link */
 171
 172	unsigned short imra_value;
 173	unsigned short imrb_value;
 174	unsigned char  pim_value;
 175
 176	spinlock_t lock;
 177	struct work_struct task;		/* task structure for scheduling bh */
 178
 179	u32 max_frame_size;
 180
 181	u32 pending_bh;
 182
 183	bool bh_running;
 184	bool bh_requested;
 185
 186	int dcd_chkcount; /* check counts to prevent */
 187	int cts_chkcount; /* too many IRQs if a signal */
 188	int dsr_chkcount; /* is floating */
 189	int ri_chkcount;
 190
 191	bool rx_enabled;
 192	bool rx_overflow;
 193
 194	bool tx_enabled;
 195	bool tx_active;
 196	bool tx_aborting;
 197	u32 idle_mode;
 198
 199	int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 200
 201	char device_name[25];		/* device instance name */
 202
 203	unsigned int io_base;	/* base I/O address of adapter */
 204	unsigned int irq_level;
 205
 206	MGSL_PARAMS params;		/* communications parameters */
 207
 208	unsigned char serial_signals;	/* current serial signal states */
 209
 210	bool irq_occurred;		/* for diagnostics use */
 211	char testing_irq;
 212	unsigned int init_error;	/* startup error (DIAGS)	*/
 213
 214	char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 215	bool drop_rts_on_tx_done;
 216
 217	struct	_input_signal_events	input_signal_events;
 218
 219	/* PCMCIA support */
 220	struct pcmcia_device	*p_dev;
 221	int		      stop;
 222
 223	/* SPPP/Cisco HDLC device parts */
 224	int netcount;
 225	spinlock_t netlock;
 226
 227#if SYNCLINK_GENERIC_HDLC
 228	struct net_device *netdev;
 229#endif
 230
 231} MGSLPC_INFO;
 232
 233#define MGSLPC_MAGIC 0x5402
 234
 235/*
 236 * The size of the serial xmit buffer is 1 page, or 4096 bytes
 237 */
 238#define TXBUFSIZE 4096
 239
 240
 241#define CHA     0x00   /* channel A offset */
 242#define CHB     0x40   /* channel B offset */
 243
 244/*
 245 *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 246 */
 247#undef PVR
 248
 249#define RXFIFO  0
 250#define TXFIFO  0
 251#define STAR    0x20
 252#define CMDR    0x20
 253#define RSTA    0x21
 254#define PRE     0x21
 255#define MODE    0x22
 256#define TIMR    0x23
 257#define XAD1    0x24
 258#define XAD2    0x25
 259#define RAH1    0x26
 260#define RAH2    0x27
 261#define DAFO    0x27
 262#define RAL1    0x28
 263#define RFC     0x28
 264#define RHCR    0x29
 265#define RAL2    0x29
 266#define RBCL    0x2a
 267#define XBCL    0x2a
 268#define RBCH    0x2b
 269#define XBCH    0x2b
 270#define CCR0    0x2c
 271#define CCR1    0x2d
 272#define CCR2    0x2e
 273#define CCR3    0x2f
 274#define VSTR    0x34
 275#define BGR     0x34
 276#define RLCR    0x35
 277#define AML     0x36
 278#define AMH     0x37
 279#define GIS     0x38
 280#define IVA     0x38
 281#define IPC     0x39
 282#define ISR     0x3a
 283#define IMR     0x3a
 284#define PVR     0x3c
 285#define PIS     0x3d
 286#define PIM     0x3d
 287#define PCR     0x3e
 288#define CCR4    0x3f
 289
 290// IMR/ISR
 291
 292#define IRQ_BREAK_ON    BIT15   // rx break detected
 293#define IRQ_DATAOVERRUN BIT14	// receive data overflow
 294#define IRQ_ALLSENT     BIT13	// all sent
 295#define IRQ_UNDERRUN    BIT12	// transmit data underrun
 296#define IRQ_TIMER       BIT11	// timer interrupt
 297#define IRQ_CTS         BIT10	// CTS status change
 298#define IRQ_TXREPEAT    BIT9	// tx message repeat
 299#define IRQ_TXFIFO      BIT8	// transmit pool ready
 300#define IRQ_RXEOM       BIT7	// receive message end
 301#define IRQ_EXITHUNT    BIT6	// receive frame start
 302#define IRQ_RXTIME      BIT6    // rx char timeout
 303#define IRQ_DCD         BIT2	// carrier detect status change
 304#define IRQ_OVERRUN     BIT1	// receive frame overflow
 305#define IRQ_RXFIFO      BIT0	// receive pool full
 306
 307// STAR
 308
 309#define XFW   BIT6		// transmit FIFO write enable
 310#define CEC   BIT2		// command executing
 311#define CTS   BIT1		// CTS state
 312
 313#define PVR_DTR      BIT0
 314#define PVR_DSR      BIT1
 315#define PVR_RI       BIT2
 316#define PVR_AUTOCTS  BIT3
 317#define PVR_RS232    0x20   /* 0010b */
 318#define PVR_V35      0xe0   /* 1110b */
 319#define PVR_RS422    0x40   /* 0100b */
 320
 321/* Register access functions */
 322
 323#define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 324#define read_reg(info, reg) inb((info)->io_base + (reg))
 325
 326#define read_reg16(info, reg) inw((info)->io_base + (reg))
 327#define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 328
 329#define set_reg_bits(info, reg, mask) \
 330    write_reg(info, (reg), \
 331		 (unsigned char) (read_reg(info, (reg)) | (mask)))
 332#define clear_reg_bits(info, reg, mask) \
 333    write_reg(info, (reg), \
 334		 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 335/*
 336 * interrupt enable/disable routines
 337 */
 338static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 339{
 340	if (channel == CHA) {
 341		info->imra_value |= mask;
 342		write_reg16(info, CHA + IMR, info->imra_value);
 343	} else {
 344		info->imrb_value |= mask;
 345		write_reg16(info, CHB + IMR, info->imrb_value);
 346	}
 347}
 348static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 349{
 350	if (channel == CHA) {
 351		info->imra_value &= ~mask;
 352		write_reg16(info, CHA + IMR, info->imra_value);
 353	} else {
 354		info->imrb_value &= ~mask;
 355		write_reg16(info, CHB + IMR, info->imrb_value);
 356	}
 357}
 358
 359#define port_irq_disable(info, mask) \
 360  { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 361
 362#define port_irq_enable(info, mask) \
 363  { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 364
 365static void rx_start(MGSLPC_INFO *info);
 366static void rx_stop(MGSLPC_INFO *info);
 367
 368static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
 369static void tx_stop(MGSLPC_INFO *info);
 370static void tx_set_idle(MGSLPC_INFO *info);
 371
 372static void get_signals(MGSLPC_INFO *info);
 373static void set_signals(MGSLPC_INFO *info);
 374
 375static void reset_device(MGSLPC_INFO *info);
 376
 377static void hdlc_mode(MGSLPC_INFO *info);
 378static void async_mode(MGSLPC_INFO *info);
 379
 380static void tx_timeout(unsigned long context);
 381
 382static int carrier_raised(struct tty_port *port);
 383static void dtr_rts(struct tty_port *port, int onoff);
 384
 385#if SYNCLINK_GENERIC_HDLC
 386#define dev_to_port(D) (dev_to_hdlc(D)->priv)
 387static void hdlcdev_tx_done(MGSLPC_INFO *info);
 388static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 389static int  hdlcdev_init(MGSLPC_INFO *info);
 390static void hdlcdev_exit(MGSLPC_INFO *info);
 391#endif
 392
 393static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 394
 395static bool register_test(MGSLPC_INFO *info);
 396static bool irq_test(MGSLPC_INFO *info);
 397static int adapter_test(MGSLPC_INFO *info);
 398
 399static int claim_resources(MGSLPC_INFO *info);
 400static void release_resources(MGSLPC_INFO *info);
 401static void mgslpc_add_device(MGSLPC_INFO *info);
 402static void mgslpc_remove_device(MGSLPC_INFO *info);
 403
 404static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
 405static void rx_reset_buffers(MGSLPC_INFO *info);
 406static int  rx_alloc_buffers(MGSLPC_INFO *info);
 407static void rx_free_buffers(MGSLPC_INFO *info);
 408
 409static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 410
 411/*
 412 * Bottom half interrupt handlers
 413 */
 414static void bh_handler(struct work_struct *work);
 415static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
 416static void bh_status(MGSLPC_INFO *info);
 417
 418/*
 419 * ioctl handlers
 420 */
 421static int tiocmget(struct tty_struct *tty);
 422static int tiocmset(struct tty_struct *tty,
 423					unsigned int set, unsigned int clear);
 424static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 425static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 426static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
 427static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 428static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 429static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
 430static int tx_abort(MGSLPC_INFO *info);
 431static int set_rxenable(MGSLPC_INFO *info, int enable);
 432static int wait_events(MGSLPC_INFO *info, int __user *mask);
 433
 434static MGSLPC_INFO *mgslpc_device_list = NULL;
 435static int mgslpc_device_count = 0;
 436
 437/*
 438 * Set this param to non-zero to load eax with the
 439 * .text section address and breakpoint on module load.
 440 * This is useful for use with gdb and add-symbol-file command.
 441 */
 442static int break_on_load=0;
 443
 444/*
 445 * Driver major number, defaults to zero to get auto
 446 * assigned major number. May be forced as module parameter.
 447 */
 448static int ttymajor=0;
 449
 450static int debug_level = 0;
 451static int maxframe[MAX_DEVICE_COUNT] = {0,};
 452
 453module_param(break_on_load, bool, 0);
 454module_param(ttymajor, int, 0);
 455module_param(debug_level, int, 0);
 456module_param_array(maxframe, int, NULL, 0);
 457
 458MODULE_LICENSE("GPL");
 459
 460static char *driver_name = "SyncLink PC Card driver";
 461static char *driver_version = "$Revision: 4.34 $";
 462
 463static struct tty_driver *serial_driver;
 464
 465/* number of characters left in xmit buffer before we ask for more */
 466#define WAKEUP_CHARS 256
 467
 468static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
 469static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 470
 471/* PCMCIA prototypes */
 472
 473static int mgslpc_config(struct pcmcia_device *link);
 474static void mgslpc_release(u_long arg);
 475static void mgslpc_detach(struct pcmcia_device *p_dev);
 476
 477/*
 478 * 1st function defined in .text section. Calling this function in
 479 * init_module() followed by a breakpoint allows a remote debugger
 480 * (gdb) to get the .text address for the add-symbol-file command.
 481 * This allows remote debugging of dynamically loadable modules.
 482 */
 483static void* mgslpc_get_text_ptr(void)
 484{
 485	return mgslpc_get_text_ptr;
 486}
 487
 488/**
 489 * line discipline callback wrappers
 490 *
 491 * The wrappers maintain line discipline references
 492 * while calling into the line discipline.
 493 *
 494 * ldisc_receive_buf  - pass receive data to line discipline
 495 */
 496
 497static void ldisc_receive_buf(struct tty_struct *tty,
 498			      const __u8 *data, char *flags, int count)
 499{
 500	struct tty_ldisc *ld;
 501	if (!tty)
 502		return;
 503	ld = tty_ldisc_ref(tty);
 504	if (ld) {
 505		if (ld->ops->receive_buf)
 506			ld->ops->receive_buf(tty, data, flags, count);
 507		tty_ldisc_deref(ld);
 508	}
 509}
 510
 511static const struct tty_port_operations mgslpc_port_ops = {
 512	.carrier_raised = carrier_raised,
 513	.dtr_rts = dtr_rts
 514};
 515
 516static int mgslpc_probe(struct pcmcia_device *link)
 517{
 518    MGSLPC_INFO *info;
 519    int ret;
 520
 521    if (debug_level >= DEBUG_LEVEL_INFO)
 522	    printk("mgslpc_attach\n");
 523
 524    info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 525    if (!info) {
 526	    printk("Error can't allocate device instance data\n");
 527	    return -ENOMEM;
 528    }
 529
 530    info->magic = MGSLPC_MAGIC;
 531    tty_port_init(&info->port);
 532    info->port.ops = &mgslpc_port_ops;
 533    INIT_WORK(&info->task, bh_handler);
 534    info->max_frame_size = 4096;
 535    info->port.close_delay = 5*HZ/10;
 536    info->port.closing_wait = 30*HZ;
 537    init_waitqueue_head(&info->status_event_wait_q);
 538    init_waitqueue_head(&info->event_wait_q);
 539    spin_lock_init(&info->lock);
 540    spin_lock_init(&info->netlock);
 541    memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 542    info->idle_mode = HDLC_TXIDLE_FLAGS;
 543    info->imra_value = 0xffff;
 544    info->imrb_value = 0xffff;
 545    info->pim_value = 0xff;
 546
 547    info->p_dev = link;
 548    link->priv = info;
 549
 550    /* Initialize the struct pcmcia_device structure */
 551
 552    ret = mgslpc_config(link);
 553    if (ret)
 554	    return ret;
 555
 556    mgslpc_add_device(info);
 557
 558    return 0;
 559}
 560
 561/* Card has been inserted.
 562 */
 563
 564static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
 565{
 566	return pcmcia_request_io(p_dev);
 567}
 568
 569static int mgslpc_config(struct pcmcia_device *link)
 570{
 571    MGSLPC_INFO *info = link->priv;
 572    int ret;
 573
 574    if (debug_level >= DEBUG_LEVEL_INFO)
 575	    printk("mgslpc_config(0x%p)\n", link);
 576
 577    link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 578
 579    ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
 580    if (ret != 0)
 581	    goto failed;
 582
 583    link->config_index = 8;
 584    link->config_regs = PRESENT_OPTION;
 585
 586    ret = pcmcia_request_irq(link, mgslpc_isr);
 587    if (ret)
 588	    goto failed;
 589    ret = pcmcia_enable_device(link);
 590    if (ret)
 591	    goto failed;
 592
 593    info->io_base = link->resource[0]->start;
 594    info->irq_level = link->irq;
 595    return 0;
 596
 597failed:
 598    mgslpc_release((u_long)link);
 599    return -ENODEV;
 600}
 601
 602/* Card has been removed.
 603 * Unregister device and release PCMCIA configuration.
 604 * If device is open, postpone until it is closed.
 605 */
 606static void mgslpc_release(u_long arg)
 607{
 608	struct pcmcia_device *link = (struct pcmcia_device *)arg;
 609
 610	if (debug_level >= DEBUG_LEVEL_INFO)
 611		printk("mgslpc_release(0x%p)\n", link);
 612
 613	pcmcia_disable_device(link);
 614}
 615
 616static void mgslpc_detach(struct pcmcia_device *link)
 617{
 618	if (debug_level >= DEBUG_LEVEL_INFO)
 619		printk("mgslpc_detach(0x%p)\n", link);
 620
 621	((MGSLPC_INFO *)link->priv)->stop = 1;
 622	mgslpc_release((u_long)link);
 623
 624	mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 625}
 626
 627static int mgslpc_suspend(struct pcmcia_device *link)
 628{
 629	MGSLPC_INFO *info = link->priv;
 630
 631	info->stop = 1;
 632
 633	return 0;
 634}
 635
 636static int mgslpc_resume(struct pcmcia_device *link)
 637{
 638	MGSLPC_INFO *info = link->priv;
 639
 640	info->stop = 0;
 641
 642	return 0;
 643}
 644
 645
 646static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
 647					char *name, const char *routine)
 648{
 649#ifdef MGSLPC_PARANOIA_CHECK
 650	static const char *badmagic =
 651		"Warning: bad magic number for mgsl struct (%s) in %s\n";
 652	static const char *badinfo =
 653		"Warning: null mgslpc_info for (%s) in %s\n";
 654
 655	if (!info) {
 656		printk(badinfo, name, routine);
 657		return true;
 658	}
 659	if (info->magic != MGSLPC_MAGIC) {
 660		printk(badmagic, name, routine);
 661		return true;
 662	}
 663#else
 664	if (!info)
 665		return true;
 666#endif
 667	return false;
 668}
 669
 670
 671#define CMD_RXFIFO      BIT7	// release current rx FIFO
 672#define CMD_RXRESET     BIT6	// receiver reset
 673#define CMD_RXFIFO_READ BIT5
 674#define CMD_START_TIMER BIT4
 675#define CMD_TXFIFO      BIT3	// release current tx FIFO
 676#define CMD_TXEOM       BIT1	// transmit end message
 677#define CMD_TXRESET     BIT0	// transmit reset
 678
 679static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 680{
 681	int i = 0;
 682	/* wait for command completion */
 683	while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 684		udelay(1);
 685		if (i++ == 1000)
 686			return false;
 687	}
 688	return true;
 689}
 690
 691static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 692{
 693	wait_command_complete(info, channel);
 694	write_reg(info, (unsigned char) (channel + CMDR), cmd);
 695}
 696
 697static void tx_pause(struct tty_struct *tty)
 698{
 699	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 700	unsigned long flags;
 701
 702	if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 703		return;
 704	if (debug_level >= DEBUG_LEVEL_INFO)
 705		printk("tx_pause(%s)\n",info->device_name);
 706
 707	spin_lock_irqsave(&info->lock,flags);
 708	if (info->tx_enabled)
 709	 	tx_stop(info);
 710	spin_unlock_irqrestore(&info->lock,flags);
 711}
 712
 713static void tx_release(struct tty_struct *tty)
 714{
 715	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 716	unsigned long flags;
 717
 718	if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 719		return;
 720	if (debug_level >= DEBUG_LEVEL_INFO)
 721		printk("tx_release(%s)\n",info->device_name);
 722
 723	spin_lock_irqsave(&info->lock,flags);
 724	if (!info->tx_enabled)
 725	 	tx_start(info, tty);
 726	spin_unlock_irqrestore(&info->lock,flags);
 727}
 728
 729/* Return next bottom half action to perform.
 730 * or 0 if nothing to do.
 731 */
 732static int bh_action(MGSLPC_INFO *info)
 733{
 734	unsigned long flags;
 735	int rc = 0;
 736
 737	spin_lock_irqsave(&info->lock,flags);
 738
 739	if (info->pending_bh & BH_RECEIVE) {
 740		info->pending_bh &= ~BH_RECEIVE;
 741		rc = BH_RECEIVE;
 742	} else if (info->pending_bh & BH_TRANSMIT) {
 743		info->pending_bh &= ~BH_TRANSMIT;
 744		rc = BH_TRANSMIT;
 745	} else if (info->pending_bh & BH_STATUS) {
 746		info->pending_bh &= ~BH_STATUS;
 747		rc = BH_STATUS;
 748	}
 749
 750	if (!rc) {
 751		/* Mark BH routine as complete */
 752		info->bh_running = false;
 753		info->bh_requested = false;
 754	}
 755
 756	spin_unlock_irqrestore(&info->lock,flags);
 757
 758	return rc;
 759}
 760
 761static void bh_handler(struct work_struct *work)
 762{
 763	MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 764	struct tty_struct *tty;
 765	int action;
 766
 767	if (!info)
 768		return;
 769
 770	if (debug_level >= DEBUG_LEVEL_BH)
 771		printk( "%s(%d):bh_handler(%s) entry\n",
 772			__FILE__,__LINE__,info->device_name);
 773
 774	info->bh_running = true;
 775	tty = tty_port_tty_get(&info->port);
 776
 777	while((action = bh_action(info)) != 0) {
 778
 779		/* Process work item */
 780		if ( debug_level >= DEBUG_LEVEL_BH )
 781			printk( "%s(%d):bh_handler() work item action=%d\n",
 782				__FILE__,__LINE__,action);
 783
 784		switch (action) {
 785
 786		case BH_RECEIVE:
 787			while(rx_get_frame(info, tty));
 788			break;
 789		case BH_TRANSMIT:
 790			bh_transmit(info, tty);
 791			break;
 792		case BH_STATUS:
 793			bh_status(info);
 794			break;
 795		default:
 796			/* unknown work item ID */
 797			printk("Unknown work item ID=%08X!\n", action);
 798			break;
 799		}
 800	}
 801
 802	tty_kref_put(tty);
 803	if (debug_level >= DEBUG_LEVEL_BH)
 804		printk( "%s(%d):bh_handler(%s) exit\n",
 805			__FILE__,__LINE__,info->device_name);
 806}
 807
 808static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
 809{
 810	if (debug_level >= DEBUG_LEVEL_BH)
 811		printk("bh_transmit() entry on %s\n", info->device_name);
 812
 813	if (tty)
 814		tty_wakeup(tty);
 815}
 816
 817static void bh_status(MGSLPC_INFO *info)
 818{
 819	info->ri_chkcount = 0;
 820	info->dsr_chkcount = 0;
 821	info->dcd_chkcount = 0;
 822	info->cts_chkcount = 0;
 823}
 824
 825/* eom: non-zero = end of frame */
 826static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 827{
 828	unsigned char data[2];
 829	unsigned char fifo_count, read_count, i;
 830	RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 831
 832	if (debug_level >= DEBUG_LEVEL_ISR)
 833		printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 834
 835	if (!info->rx_enabled)
 836		return;
 837
 838	if (info->rx_frame_count >= info->rx_buf_count) {
 839		/* no more free buffers */
 840		issue_command(info, CHA, CMD_RXRESET);
 841		info->pending_bh |= BH_RECEIVE;
 842		info->rx_overflow = true;
 843		info->icount.buf_overrun++;
 844		return;
 845	}
 846
 847	if (eom) {
 848		/* end of frame, get FIFO count from RBCL register */
 849		if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
 850			fifo_count = 32;
 851	} else
 852		fifo_count = 32;
 853
 854	do {
 855		if (fifo_count == 1) {
 856			read_count = 1;
 857			data[0] = read_reg(info, CHA + RXFIFO);
 858		} else {
 859			read_count = 2;
 860			*((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 861		}
 862		fifo_count -= read_count;
 863		if (!fifo_count && eom)
 864			buf->status = data[--read_count];
 865
 866		for (i = 0; i < read_count; i++) {
 867			if (buf->count >= info->max_frame_size) {
 868				/* frame too large, reset receiver and reset current buffer */
 869				issue_command(info, CHA, CMD_RXRESET);
 870				buf->count = 0;
 871				return;
 872			}
 873			*(buf->data + buf->count) = data[i];
 874			buf->count++;
 875		}
 876	} while (fifo_count);
 877
 878	if (eom) {
 879		info->pending_bh |= BH_RECEIVE;
 880		info->rx_frame_count++;
 881		info->rx_put++;
 882		if (info->rx_put >= info->rx_buf_count)
 883			info->rx_put = 0;
 884	}
 885	issue_command(info, CHA, CMD_RXFIFO);
 886}
 887
 888static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
 889{
 890	unsigned char data, status, flag;
 891	int fifo_count;
 892	int work = 0;
 893 	struct mgsl_icount *icount = &info->icount;
 894
 895	if (tcd) {
 896		/* early termination, get FIFO count from RBCL register */
 897		fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 898
 899		/* Zero fifo count could mean 0 or 32 bytes available.
 900		 * If BIT5 of STAR is set then at least 1 byte is available.
 901		 */
 902		if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 903			fifo_count = 32;
 904	} else
 905		fifo_count = 32;
 906
 907	tty_buffer_request_room(tty, fifo_count);
 908	/* Flush received async data to receive data buffer. */
 909	while (fifo_count) {
 910		data   = read_reg(info, CHA + RXFIFO);
 911		status = read_reg(info, CHA + RXFIFO);
 912		fifo_count -= 2;
 913
 914		icount->rx++;
 915		flag = TTY_NORMAL;
 916
 917		// if no frameing/crc error then save data
 918		// BIT7:parity error
 919		// BIT6:framing error
 920
 921		if (status & (BIT7 + BIT6)) {
 922			if (status & BIT7)
 923				icount->parity++;
 924			else
 925				icount->frame++;
 926
 927			/* discard char if tty control flags say so */
 928			if (status & info->ignore_status_mask)
 929				continue;
 930
 931			status &= info->read_status_mask;
 932
 933			if (status & BIT7)
 934				flag = TTY_PARITY;
 935			else if (status & BIT6)
 936				flag = TTY_FRAME;
 937		}
 938		work += tty_insert_flip_char(tty, data, flag);
 939	}
 940	issue_command(info, CHA, CMD_RXFIFO);
 941
 942	if (debug_level >= DEBUG_LEVEL_ISR) {
 943		printk("%s(%d):rx_ready_async",
 944			__FILE__,__LINE__);
 945		printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
 946			__FILE__,__LINE__,icount->rx,icount->brk,
 947			icount->parity,icount->frame,icount->overrun);
 948	}
 949
 950	if (work)
 951		tty_flip_buffer_push(tty);
 952}
 953
 954
 955static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
 956{
 957	if (!info->tx_active)
 958		return;
 959
 960	info->tx_active = false;
 961	info->tx_aborting = false;
 962
 963	if (info->params.mode == MGSL_MODE_ASYNC)
 964		return;
 965
 966	info->tx_count = info->tx_put = info->tx_get = 0;
 967	del_timer(&info->tx_timer);
 968
 969	if (info->drop_rts_on_tx_done) {
 970		get_signals(info);
 971		if (info->serial_signals & SerialSignal_RTS) {
 972			info->serial_signals &= ~SerialSignal_RTS;
 973			set_signals(info);
 974		}
 975		info->drop_rts_on_tx_done = false;
 976	}
 977
 978#if SYNCLINK_GENERIC_HDLC
 979	if (info->netcount)
 980		hdlcdev_tx_done(info);
 981	else
 982#endif
 983	{
 984		if (tty->stopped || tty->hw_stopped) {
 985			tx_stop(info);
 986			return;
 987		}
 988		info->pending_bh |= BH_TRANSMIT;
 989	}
 990}
 991
 992static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
 993{
 994	unsigned char fifo_count = 32;
 995	int c;
 996
 997	if (debug_level >= DEBUG_LEVEL_ISR)
 998		printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
 999
1000	if (info->params.mode == MGSL_MODE_HDLC) {
1001		if (!info->tx_active)
1002			return;
1003	} else {
1004		if (tty->stopped || tty->hw_stopped) {
1005			tx_stop(info);
1006			return;
1007		}
1008		if (!info->tx_count)
1009			info->tx_active = false;
1010	}
1011
1012	if (!info->tx_count)
1013		return;
1014
1015	while (info->tx_count && fifo_count) {
1016		c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1017
1018		if (c == 1) {
1019			write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1020		} else {
1021			write_reg16(info, CHA + TXFIFO,
1022					  *((unsigned short*)(info->tx_buf + info->tx_get)));
1023		}
1024		info->tx_count -= c;
1025		info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1026		fifo_count -= c;
1027	}
1028
1029	if (info->params.mode == MGSL_MODE_ASYNC) {
1030		if (info->tx_count < WAKEUP_CHARS)
1031			info->pending_bh |= BH_TRANSMIT;
1032		issue_command(info, CHA, CMD_TXFIFO);
1033	} else {
1034		if (info->tx_count)
1035			issue_command(info, CHA, CMD_TXFIFO);
1036		else
1037			issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1038	}
1039}
1040
1041static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1042{
1043	get_signals(info);
1044	if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1045		irq_disable(info, CHB, IRQ_CTS);
1046	info->icount.cts++;
1047	if (info->serial_signals & SerialSignal_CTS)
1048		info->input_signal_events.cts_up++;
1049	else
1050		info->input_signal_events.cts_down++;
1051	wake_up_interruptible(&info->status_event_wait_q);
1052	wake_up_interruptible(&info->event_wait_q);
1053
1054	if (info->port.flags & ASYNC_CTS_FLOW) {
1055		if (tty->hw_stopped) {
1056			if (info->serial_signals & SerialSignal_CTS) {
1057				if (debug_level >= DEBUG_LEVEL_ISR)
1058					printk("CTS tx start...");
1059				if (tty)
1060					tty->hw_stopped = 0;
1061				tx_start(info, tty);
1062				info->pending_bh |= BH_TRANSMIT;
1063				return;
1064			}
1065		} else {
1066			if (!(info->serial_signals & SerialSignal_CTS)) {
1067				if (debug_level >= DEBUG_LEVEL_ISR)
1068					printk("CTS tx stop...");
1069				if (tty)
1070					tty->hw_stopped = 1;
1071				tx_stop(info);
1072			}
1073		}
1074	}
1075	info->pending_bh |= BH_STATUS;
1076}
1077
1078static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1079{
1080	get_signals(info);
1081	if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1082		irq_disable(info, CHB, IRQ_DCD);
1083	info->icount.dcd++;
1084	if (info->serial_signals & SerialSignal_DCD) {
1085		info->input_signal_events.dcd_up++;
1086	}
1087	else
1088		info->input_signal_events.dcd_down++;
1089#if SYNCLINK_GENERIC_HDLC
1090	if (info->netcount) {
1091		if (info->serial_signals & SerialSignal_DCD)
1092			netif_carrier_on(info->netdev);
1093		else
1094			netif_carrier_off(info->netdev);
1095	}
1096#endif
1097	wake_up_interruptible(&info->status_event_wait_q);
1098	wake_up_interruptible(&info->event_wait_q);
1099
1100	if (info->port.flags & ASYNC_CHECK_CD) {
1101		if (debug_level >= DEBUG_LEVEL_ISR)
1102			printk("%s CD now %s...", info->device_name,
1103			       (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1104		if (info->serial_signals & SerialSignal_DCD)
1105			wake_up_interruptible(&info->port.open_wait);
1106		else {
1107			if (debug_level >= DEBUG_LEVEL_ISR)
1108				printk("doing serial hangup...");
1109			if (tty)
1110				tty_hangup(tty);
1111		}
1112	}
1113	info->pending_bh |= BH_STATUS;
1114}
1115
1116static void dsr_change(MGSLPC_INFO *info)
1117{
1118	get_signals(info);
1119	if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1120		port_irq_disable(info, PVR_DSR);
1121	info->icount.dsr++;
1122	if (info->serial_signals & SerialSignal_DSR)
1123		info->input_signal_events.dsr_up++;
1124	else
1125		info->input_signal_events.dsr_down++;
1126	wake_up_interruptible(&info->status_event_wait_q);
1127	wake_up_interruptible(&info->event_wait_q);
1128	info->pending_bh |= BH_STATUS;
1129}
1130
1131static void ri_change(MGSLPC_INFO *info)
1132{
1133	get_signals(info);
1134	if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1135		port_irq_disable(info, PVR_RI);
1136	info->icount.rng++;
1137	if (info->serial_signals & SerialSignal_RI)
1138		info->input_signal_events.ri_up++;
1139	else
1140		info->input_signal_events.ri_down++;
1141	wake_up_interruptible(&info->status_event_wait_q);
1142	wake_up_interruptible(&info->event_wait_q);
1143	info->pending_bh |= BH_STATUS;
1144}
1145
1146/* Interrupt service routine entry point.
1147 *
1148 * Arguments:
1149 *
1150 * irq     interrupt number that caused interrupt
1151 * dev_id  device ID supplied during interrupt registration
1152 */
1153static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1154{
1155	MGSLPC_INFO *info = dev_id;
1156	struct tty_struct *tty;
1157	unsigned short isr;
1158	unsigned char gis, pis;
1159	int count=0;
1160
1161	if (debug_level >= DEBUG_LEVEL_ISR)
1162		printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1163
1164	if (!(info->p_dev->_locked))
1165		return IRQ_HANDLED;
1166
1167	tty = tty_port_tty_get(&info->port);
1168
1169	spin_lock(&info->lock);
1170
1171	while ((gis = read_reg(info, CHA + GIS))) {
1172		if (debug_level >= DEBUG_LEVEL_ISR)
1173			printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1174
1175		if ((gis & 0x70) || count > 1000) {
1176			printk("synclink_cs:hardware failed or ejected\n");
1177			break;
1178		}
1179		count++;
1180
1181		if (gis & (BIT1 + BIT0)) {
1182			isr = read_reg16(info, CHB + ISR);
1183			if (isr & IRQ_DCD)
1184				dcd_change(info, tty);
1185			if (isr & IRQ_CTS)
1186				cts_change(info, tty);
1187		}
1188		if (gis & (BIT3 + BIT2))
1189		{
1190			isr = read_reg16(info, CHA + ISR);
1191			if (isr & IRQ_TIMER) {
1192				info->irq_occurred = true;
1193				irq_disable(info, CHA, IRQ_TIMER);
1194			}
1195
1196			/* receive IRQs */
1197			if (isr & IRQ_EXITHUNT) {
1198				info->icount.exithunt++;
1199				wake_up_interruptible(&info->event_wait_q);
1200			}
1201			if (isr & IRQ_BREAK_ON) {
1202				info->icount.brk++;
1203				if (info->port.flags & ASYNC_SAK)
1204					do_SAK(tty);
1205			}
1206			if (isr & IRQ_RXTIME) {
1207				issue_command(info, CHA, CMD_RXFIFO_READ);
1208			}
1209			if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1210				if (info->params.mode == MGSL_MODE_HDLC)
1211					rx_ready_hdlc(info, isr & IRQ_RXEOM);
1212				else
1213					rx_ready_async(info, isr & IRQ_RXEOM, tty);
1214			}
1215
1216			/* transmit IRQs */
1217			if (isr & IRQ_UNDERRUN) {
1218				if (info->tx_aborting)
1219					info->icount.txabort++;
1220				else
1221					info->icount.txunder++;
1222				tx_done(info, tty);
1223			}
1224			else if (isr & IRQ_ALLSENT) {
1225				info->icount.txok++;
1226				tx_done(info, tty);
1227			}
1228			else if (isr & IRQ_TXFIFO)
1229				tx_ready(info, tty);
1230		}
1231		if (gis & BIT7) {
1232			pis = read_reg(info, CHA + PIS);
1233			if (pis & BIT1)
1234				dsr_change(info);
1235			if (pis & BIT2)
1236				ri_change(info);
1237		}
1238	}
1239
1240	/* Request bottom half processing if there's something
1241	 * for it to do and the bh is not already running
1242	 */
1243
1244	if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1245		if ( debug_level >= DEBUG_LEVEL_ISR )
1246			printk("%s(%d):%s queueing bh task.\n",
1247				__FILE__,__LINE__,info->device_name);
1248		schedule_work(&info->task);
1249		info->bh_requested = true;
1250	}
1251
1252	spin_unlock(&info->lock);
1253	tty_kref_put(tty);
1254
1255	if (debug_level >= DEBUG_LEVEL_ISR)
1256		printk("%s(%d):mgslpc_isr(%d)exit.\n",
1257		       __FILE__, __LINE__, info->irq_level);
1258
1259	return IRQ_HANDLED;
1260}
1261
1262/* Initialize and start device.
1263 */
1264static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1265{
1266	int retval = 0;
1267
1268	if (debug_level >= DEBUG_LEVEL_INFO)
1269		printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1270
1271	if (info->port.flags & ASYNC_INITIALIZED)
1272		return 0;
1273
1274	if (!info->tx_buf) {
1275		/* allocate a page of memory for a transmit buffer */
1276		info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1277		if (!info->tx_buf) {
1278			printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1279				__FILE__,__LINE__,info->device_name);
1280			return -ENOMEM;
1281		}
1282	}
1283
1284	info->pending_bh = 0;
1285
1286	memset(&info->icount, 0, sizeof(info->icount));
1287
1288	setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1289
1290	/* Allocate and claim adapter resources */
1291	retval = claim_resources(info);
1292
1293	/* perform existence check and diagnostics */
1294	if ( !retval )
1295		retval = adapter_test(info);
1296
1297	if ( retval ) {
1298  		if (capable(CAP_SYS_ADMIN) && tty)
1299			set_bit(TTY_IO_ERROR, &tty->flags);
1300		release_resources(info);
1301  		return retval;
1302  	}
1303
1304	/* program hardware for current parameters */
1305	mgslpc_change_params(info, tty);
1306
1307	if (tty)
1308		clear_bit(TTY_IO_ERROR, &tty->flags);
1309
1310	info->port.flags |= ASYNC_INITIALIZED;
1311
1312	return 0;
1313}
1314
1315/* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1316 */
1317static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1318{
1319	unsigned long flags;
1320
1321	if (!(info->port.flags & ASYNC_INITIALIZED))
1322		return;
1323
1324	if (debug_level >= DEBUG_LEVEL_INFO)
1325		printk("%s(%d):mgslpc_shutdown(%s)\n",
1326			 __FILE__,__LINE__, info->device_name );
1327
1328	/* clear status wait queue because status changes */
1329	/* can't happen after shutting down the hardware */
1330	wake_up_interruptible(&info->status_event_wait_q);
1331	wake_up_interruptible(&info->event_wait_q);
1332
1333	del_timer_sync(&info->tx_timer);
1334
1335	if (info->tx_buf) {
1336		free_page((unsigned long) info->tx_buf);
1337		info->tx_buf = NULL;
1338	}
1339
1340	spin_lock_irqsave(&info->lock,flags);
1341
1342	rx_stop(info);
1343	tx_stop(info);
1344
1345	/* TODO:disable interrupts instead of reset to preserve signal states */
1346	reset_device(info);
1347
1348 	if (!tty || tty->termios->c_cflag & HUPCL) {
1349 		info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1350		set_signals(info);
1351	}
1352
1353	spin_unlock_irqrestore(&info->lock,flags);
1354
1355	release_resources(info);
1356
1357	if (tty)
1358		set_bit(TTY_IO_ERROR, &tty->flags);
1359
1360	info->port.flags &= ~ASYNC_INITIALIZED;
1361}
1362
1363static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1364{
1365	unsigned long flags;
1366
1367	spin_lock_irqsave(&info->lock,flags);
1368
1369	rx_stop(info);
1370	tx_stop(info);
1371	info->tx_count = info->tx_put = info->tx_get = 0;
1372
1373	if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1374		hdlc_mode(info);
1375	else
1376		async_mode(info);
1377
1378	set_signals(info);
1379
1380	info->dcd_chkcount = 0;
1381	info->cts_chkcount = 0;
1382	info->ri_chkcount = 0;
1383	info->dsr_chkcount = 0;
1384
1385	irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1386	port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1387	get_signals(info);
1388
1389	if (info->netcount || (tty && (tty->termios->c_cflag & CREAD)))
1390		rx_start(info);
1391
1392	spin_unlock_irqrestore(&info->lock,flags);
1393}
1394
1395/* Reconfigure adapter based on new parameters
1396 */
1397static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1398{
1399	unsigned cflag;
1400	int bits_per_char;
1401
1402	if (!tty || !tty->termios)
1403		return;
1404
1405	if (debug_level >= DEBUG_LEVEL_INFO)
1406		printk("%s(%d):mgslpc_change_params(%s)\n",
1407			 __FILE__,__LINE__, info->device_name );
1408
1409	cflag = tty->termios->c_cflag;
1410
1411	/* if B0 rate (hangup) specified then negate DTR and RTS */
1412	/* otherwise assert DTR and RTS */
1413 	if (cflag & CBAUD)
1414		info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1415	else
1416		info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1417
1418	/* byte size and parity */
1419
1420	switch (cflag & CSIZE) {
1421	case CS5: info->params.data_bits = 5; break;
1422	case CS6: info->params.data_bits = 6; break;
1423	case CS7: info->params.data_bits = 7; break;
1424	case CS8: info->params.data_bits = 8; break;
1425	default:  info->params.data_bits = 7; break;
1426	}
1427
1428	if (cflag & CSTOPB)
1429		info->params.stop_bits = 2;
1430	else
1431		info->params.stop_bits = 1;
1432
1433	info->params.parity = ASYNC_PARITY_NONE;
1434	if (cflag & PARENB) {
1435		if (cflag & PARODD)
1436			info->params.parity = ASYNC_PARITY_ODD;
1437		else
1438			info->params.parity = ASYNC_PARITY_EVEN;
1439#ifdef CMSPAR
1440		if (cflag & CMSPAR)
1441			info->params.parity = ASYNC_PARITY_SPACE;
1442#endif
1443	}
1444
1445	/* calculate number of jiffies to transmit a full
1446	 * FIFO (32 bytes) at specified data rate
1447	 */
1448	bits_per_char = info->params.data_bits +
1449			info->params.stop_bits + 1;
1450
1451	/* if port data rate is set to 460800 or less then
1452	 * allow tty settings to override, otherwise keep the
1453	 * current data rate.
1454	 */
1455	if (info->params.data_rate <= 460800) {
1456		info->params.data_rate = tty_get_baud_rate(tty);
1457	}
1458
1459	if ( info->params.data_rate ) {
1460		info->timeout = (32*HZ*bits_per_char) /
1461				info->params.data_rate;
1462	}
1463	info->timeout += HZ/50;		/* Add .02 seconds of slop */
1464
1465	if (cflag & CRTSCTS)
1466		info->port.flags |= ASYNC_CTS_FLOW;
1467	else
1468		info->port.flags &= ~ASYNC_CTS_FLOW;
1469
1470	if (cflag & CLOCAL)
1471		info->port.flags &= ~ASYNC_CHECK_CD;
1472	else
1473		info->port.flags |= ASYNC_CHECK_CD;
1474
1475	/* process tty input control flags */
1476
1477	info->read_status_mask = 0;
1478	if (I_INPCK(tty))
1479		info->read_status_mask |= BIT7 | BIT6;
1480	if (I_IGNPAR(tty))
1481		info->ignore_status_mask |= BIT7 | BIT6;
1482
1483	mgslpc_program_hw(info, tty);
1484}
1485
1486/* Add a character to the transmit buffer
1487 */
1488static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1489{
1490	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1491	unsigned long flags;
1492
1493	if (debug_level >= DEBUG_LEVEL_INFO) {
1494		printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1495			__FILE__,__LINE__,ch,info->device_name);
1496	}
1497
1498	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1499		return 0;
1500
1501	if (!info->tx_buf)
1502		return 0;
1503
1504	spin_lock_irqsave(&info->lock,flags);
1505
1506	if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1507		if (info->tx_count < TXBUFSIZE - 1) {
1508			info->tx_buf[info->tx_put++] = ch;
1509			info->tx_put &= TXBUFSIZE-1;
1510			info->tx_count++;
1511		}
1512	}
1513
1514	spin_unlock_irqrestore(&info->lock,flags);
1515	return 1;
1516}
1517
1518/* Enable transmitter so remaining characters in the
1519 * transmit buffer are sent.
1520 */
1521static void mgslpc_flush_chars(struct tty_struct *tty)
1522{
1523	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1524	unsigned long flags;
1525
1526	if (debug_level >= DEBUG_LEVEL_INFO)
1527		printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1528			__FILE__,__LINE__,info->device_name,info->tx_count);
1529
1530	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1531		return;
1532
1533	if (info->tx_count <= 0 || tty->stopped ||
1534	    tty->hw_stopped || !info->tx_buf)
1535		return;
1536
1537	if (debug_level >= DEBUG_LEVEL_INFO)
1538		printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1539			__FILE__,__LINE__,info->device_name);
1540
1541	spin_lock_irqsave(&info->lock,flags);
1542	if (!info->tx_active)
1543	 	tx_start(info, tty);
1544	spin_unlock_irqrestore(&info->lock,flags);
1545}
1546
1547/* Send a block of data
1548 *
1549 * Arguments:
1550 *
1551 * tty        pointer to tty information structure
1552 * buf	      pointer to buffer containing send data
1553 * count      size of send data in bytes
1554 *
1555 * Returns: number of characters written
1556 */
1557static int mgslpc_write(struct tty_struct * tty,
1558			const unsigned char *buf, int count)
1559{
1560	int c, ret = 0;
1561	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1562	unsigned long flags;
1563
1564	if (debug_level >= DEBUG_LEVEL_INFO)
1565		printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1566			__FILE__,__LINE__,info->device_name,count);
1567
1568	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1569		!info->tx_buf)
1570		goto cleanup;
1571
1572	if (info->params.mode == MGSL_MODE_HDLC) {
1573		if (count > TXBUFSIZE) {
1574			ret = -EIO;
1575			goto cleanup;
1576		}
1577		if (info->tx_active)
1578			goto cleanup;
1579		else if (info->tx_count)
1580			goto start;
1581	}
1582
1583	for (;;) {
1584		c = min(count,
1585			min(TXBUFSIZE - info->tx_count - 1,
1586			    TXBUFSIZE - info->tx_put));
1587		if (c <= 0)
1588			break;
1589
1590		memcpy(info->tx_buf + info->tx_put, buf, c);
1591
1592		spin_lock_irqsave(&info->lock,flags);
1593		info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1594		info->tx_count += c;
1595		spin_unlock_irqrestore(&info->lock,flags);
1596
1597		buf += c;
1598		count -= c;
1599		ret += c;
1600	}
1601start:
1602 	if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1603		spin_lock_irqsave(&info->lock,flags);
1604		if (!info->tx_active)
1605		 	tx_start(info, tty);
1606		spin_unlock_irqrestore(&info->lock,flags);
1607 	}
1608cleanup:
1609	if (debug_level >= DEBUG_LEVEL_INFO)
1610		printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1611			__FILE__,__LINE__,info->device_name,ret);
1612	return ret;
1613}
1614
1615/* Return the count of free bytes in transmit buffer
1616 */
1617static int mgslpc_write_room(struct tty_struct *tty)
1618{
1619	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1620	int ret;
1621
1622	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1623		return 0;
1624
1625	if (info->params.mode == MGSL_MODE_HDLC) {
1626		/* HDLC (frame oriented) mode */
1627		if (info->tx_active)
1628			return 0;
1629		else
1630			return HDLC_MAX_FRAME_SIZE;
1631	} else {
1632		ret = TXBUFSIZE - info->tx_count - 1;
1633		if (ret < 0)
1634			ret = 0;
1635	}
1636
1637	if (debug_level >= DEBUG_LEVEL_INFO)
1638		printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1639			 __FILE__,__LINE__, info->device_name, ret);
1640	return ret;
1641}
1642
1643/* Return the count of bytes in transmit buffer
1644 */
1645static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1646{
1647	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1648	int rc;
1649
1650	if (debug_level >= DEBUG_LEVEL_INFO)
1651		printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1652			 __FILE__,__LINE__, info->device_name );
1653
1654	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1655		return 0;
1656
1657	if (info->params.mode == MGSL_MODE_HDLC)
1658		rc = info->tx_active ? info->max_frame_size : 0;
1659	else
1660		rc = info->tx_count;
1661
1662	if (debug_level >= DEBUG_LEVEL_INFO)
1663		printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1664			 __FILE__,__LINE__, info->device_name, rc);
1665
1666	return rc;
1667}
1668
1669/* Discard all data in the send buffer
1670 */
1671static void mgslpc_flush_buffer(struct tty_struct *tty)
1672{
1673	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1674	unsigned long flags;
1675
1676	if (debug_level >= DEBUG_LEVEL_INFO)
1677		printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1678			 __FILE__,__LINE__, info->device_name );
1679
1680	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1681		return;
1682
1683	spin_lock_irqsave(&info->lock,flags);
1684	info->tx_count = info->tx_put = info->tx_get = 0;
1685	del_timer(&info->tx_timer);
1686	spin_unlock_irqrestore(&info->lock,flags);
1687
1688	wake_up_interruptible(&tty->write_wait);
1689	tty_wakeup(tty);
1690}
1691
1692/* Send a high-priority XON/XOFF character
1693 */
1694static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1695{
1696	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1697	unsigned long flags;
1698
1699	if (debug_level >= DEBUG_LEVEL_INFO)
1700		printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1701			 __FILE__,__LINE__, info->device_name, ch );
1702
1703	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1704		return;
1705
1706	info->x_char = ch;
1707	if (ch) {
1708		spin_lock_irqsave(&info->lock,flags);
1709		if (!info->tx_enabled)
1710		 	tx_start(info, tty);
1711		spin_unlock_irqrestore(&info->lock,flags);
1712	}
1713}
1714
1715/* Signal remote device to throttle send data (our receive data)
1716 */
1717static void mgslpc_throttle(struct tty_struct * tty)
1718{
1719	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1720	unsigned long flags;
1721
1722	if (debug_level >= DEBUG_LEVEL_INFO)
1723		printk("%s(%d):mgslpc_throttle(%s) entry\n",
1724			 __FILE__,__LINE__, info->device_name );
1725
1726	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1727		return;
1728
1729	if (I_IXOFF(tty))
1730		mgslpc_send_xchar(tty, STOP_CHAR(tty));
1731
1732 	if (tty->termios->c_cflag & CRTSCTS) {
1733		spin_lock_irqsave(&info->lock,flags);
1734		info->serial_signals &= ~SerialSignal_RTS;
1735	 	set_signals(info);
1736		spin_unlock_irqrestore(&info->lock,flags);
1737	}
1738}
1739
1740/* Signal remote device to stop throttling send data (our receive data)
1741 */
1742static void mgslpc_unthrottle(struct tty_struct * tty)
1743{
1744	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1745	unsigned long flags;
1746
1747	if (debug_level >= DEBUG_LEVEL_INFO)
1748		printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1749			 __FILE__,__LINE__, info->device_name );
1750
1751	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1752		return;
1753
1754	if (I_IXOFF(tty)) {
1755		if (info->x_char)
1756			info->x_char = 0;
1757		else
1758			mgslpc_send_xchar(tty, START_CHAR(tty));
1759	}
1760
1761 	if (tty->termios->c_cflag & CRTSCTS) {
1762		spin_lock_irqsave(&info->lock,flags);
1763		info->serial_signals |= SerialSignal_RTS;
1764	 	set_signals(info);
1765		spin_unlock_irqrestore(&info->lock,flags);
1766	}
1767}
1768
1769/* get the current serial statistics
1770 */
1771static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1772{
1773	int err;
1774	if (debug_level >= DEBUG_LEVEL_INFO)
1775		printk("get_params(%s)\n", info->device_name);
1776	if (!user_icount) {
1777		memset(&info->icount, 0, sizeof(info->icount));
1778	} else {
1779		COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1780		if (err)
1781			return -EFAULT;
1782	}
1783	return 0;
1784}
1785
1786/* get the current serial parameters
1787 */
1788static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1789{
1790	int err;
1791	if (debug_level >= DEBUG_LEVEL_INFO)
1792		printk("get_params(%s)\n", info->device_name);
1793	COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1794	if (err)
1795		return -EFAULT;
1796	return 0;
1797}
1798
1799/* set the serial parameters
1800 *
1801 * Arguments:
1802 *
1803 * 	info		pointer to device instance data
1804 * 	new_params	user buffer containing new serial params
1805 *
1806 * Returns:	0 if success, otherwise error code
1807 */
1808static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1809{
1810 	unsigned long flags;
1811	MGSL_PARAMS tmp_params;
1812	int err;
1813
1814	if (debug_level >= DEBUG_LEVEL_INFO)
1815		printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1816			info->device_name );
1817	COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1818	if (err) {
1819		if ( debug_level >= DEBUG_LEVEL_INFO )
1820			printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1821				__FILE__,__LINE__,info->device_name);
1822		return -EFAULT;
1823	}
1824
1825	spin_lock_irqsave(&info->lock,flags);
1826	memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1827	spin_unlock_irqrestore(&info->lock,flags);
1828
1829 	mgslpc_change_params(info, tty);
1830
1831	return 0;
1832}
1833
1834static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1835{
1836	int err;
1837	if (debug_level >= DEBUG_LEVEL_INFO)
1838		printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1839	COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1840	if (err)
1841		return -EFAULT;
1842	return 0;
1843}
1844
1845static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1846{
1847 	unsigned long flags;
1848	if (debug_level >= DEBUG_LEVEL_INFO)
1849		printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1850	spin_lock_irqsave(&info->lock,flags);
1851	info->idle_mode = idle_mode;
1852	tx_set_idle(info);
1853	spin_unlock_irqrestore(&info->lock,flags);
1854	return 0;
1855}
1856
1857static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1858{
1859	int err;
1860	if (debug_level >= DEBUG_LEVEL_INFO)
1861		printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1862	COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1863	if (err)
1864		return -EFAULT;
1865	return 0;
1866}
1867
1868static int set_interface(MGSLPC_INFO * info, int if_mode)
1869{
1870 	unsigned long flags;
1871	unsigned char val;
1872	if (debug_level >= DEBUG_LEVEL_INFO)
1873		printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1874	spin_lock_irqsave(&info->lock,flags);
1875	info->if_mode = if_mode;
1876
1877	val = read_reg(info, PVR) & 0x0f;
1878	switch (info->if_mode)
1879	{
1880	case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1881	case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1882	case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1883	}
1884	write_reg(info, PVR, val);
1885
1886	spin_unlock_irqrestore(&info->lock,flags);
1887	return 0;
1888}
1889
1890static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1891{
1892 	unsigned long flags;
1893
1894	if (debug_level >= DEBUG_LEVEL_INFO)
1895		printk("set_txenable(%s,%d)\n", info->device_name, enable);
1896
1897	spin_lock_irqsave(&info->lock,flags);
1898	if (enable) {
1899		if (!info->tx_enabled)
1900			tx_start(info, tty);
1901	} else {
1902		if (info->tx_enabled)
1903			tx_stop(info);
1904	}
1905	spin_unlock_irqrestore(&info->lock,flags);
1906	return 0;
1907}
1908
1909static int tx_abort(MGSLPC_INFO * info)
1910{
1911 	unsigned long flags;
1912
1913	if (debug_level >= DEBUG_LEVEL_INFO)
1914		printk("tx_abort(%s)\n", info->device_name);
1915
1916	spin_lock_irqsave(&info->lock,flags);
1917	if (info->tx_active && info->tx_count &&
1918	    info->params.mode == MGSL_MODE_HDLC) {
1919		/* clear data count so FIFO is not filled on next IRQ.
1920		 * This results in underrun and abort transmission.
1921		 */
1922		info->tx_count = info->tx_put = info->tx_get = 0;
1923		info->tx_aborting = true;
1924	}
1925	spin_unlock_irqrestore(&info->lock,flags);
1926	return 0;
1927}
1928
1929static int set_rxenable(MGSLPC_INFO * info, int enable)
1930{
1931 	unsigned long flags;
1932
1933	if (debug_level >= DEBUG_LEVEL_INFO)
1934		printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1935
1936	spin_lock_irqsave(&info->lock,flags);
1937	if (enable) {
1938		if (!info->rx_enabled)
1939			rx_start(info);
1940	} else {
1941		if (info->rx_enabled)
1942			rx_stop(info);
1943	}
1944	spin_unlock_irqrestore(&info->lock,flags);
1945	return 0;
1946}
1947
1948/* wait for specified event to occur
1949 *
1950 * Arguments:	 	info	pointer to device instance data
1951 * 			mask	pointer to bitmask of events to wait for
1952 * Return Value:	0 	if successful and bit mask updated with
1953 *				of events triggerred,
1954 * 			otherwise error code
1955 */
1956static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1957{
1958 	unsigned long flags;
1959	int s;
1960	int rc=0;
1961	struct mgsl_icount cprev, cnow;
1962	int events;
1963	int mask;
1964	struct	_input_signal_events oldsigs, newsigs;
1965	DECLARE_WAITQUEUE(wait, current);
1966
1967	COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1968	if (rc)
1969		return  -EFAULT;
1970
1971	if 

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