2 * linux/drivers/char/pcmcia/synclink_cs.c
4 * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
6 * Device driver for Microgate SyncLink PC Card
7 * multiprotocol serial adapter.
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
12 * Microgate and SyncLink are trademarks of Microgate Corporation
14 * This code is released under the GNU General Public License (GPL)
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.
29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
31 # define BREAKPOINT() asm(" int $3");
33 # define BREAKPOINT() { }
36 #define MAX_DEVICE_COUNT 4
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>
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>
66 #include <linux/bitops.h>
67 #include <asm/types.h>
68 #include <linux/termios.h>
69 #include <linux/workqueue.h>
70 #include <linux/hdlc.h>
72 #include <pcmcia/cistpl.h>
73 #include <pcmcia/cisreg.h>
74 #include <pcmcia/ds.h>
76 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
77 #define SYNCLINK_GENERIC_HDLC 1
79 #define SYNCLINK_GENERIC_HDLC 0
82 #define GET_USER(error,value,addr) error = get_user(value,addr)
83 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
84 #define PUT_USER(error,value,addr) error = put_user(value,addr)
85 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
87 #include <linux/uaccess.h>
89 static MGSL_PARAMS default_params = {
90 MGSL_MODE_HDLC, /* unsigned long mode */
91 0, /* unsigned char loopback; */
92 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
93 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
94 0, /* unsigned long clock_speed; */
95 0xff, /* unsigned char addr_filter; */
96 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
97 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
98 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
99 9600, /* unsigned long data_rate; */
100 8, /* unsigned char data_bits; */
101 1, /* unsigned char stop_bits; */
102 ASYNC_PARITY_NONE /* unsigned char parity; */
107 unsigned char status;
111 /* The queue of BH actions to be performed */
114 #define BH_TRANSMIT 2
117 #define IO_PIN_SHUTDOWN_LIMIT 100
119 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
121 struct _input_signal_events {
134 * Device instance data structure
137 typedef struct _mgslpc_info {
138 struct tty_port port;
139 void *if_ptr; /* General purpose pointer (used by SPPP) */
143 struct mgsl_icount icount;
146 int x_char; /* xon/xoff character */
147 unsigned char read_status_mask;
148 unsigned char ignore_status_mask;
150 unsigned char *tx_buf;
155 /* circular list of fixed length rx buffers */
157 unsigned char *rx_buf; /* memory allocated for all rx buffers */
158 int rx_buf_total_size; /* size of memory allocated for rx buffers */
159 int rx_put; /* index of next empty rx buffer */
160 int rx_get; /* index of next full rx buffer */
161 int rx_buf_size; /* size in bytes of single rx buffer */
162 int rx_buf_count; /* total number of rx buffers */
163 int rx_frame_count; /* number of full rx buffers */
165 wait_queue_head_t status_event_wait_q;
166 wait_queue_head_t event_wait_q;
167 struct timer_list tx_timer; /* HDLC transmit timeout timer */
168 struct _mgslpc_info *next_device; /* device list link */
170 unsigned short imra_value;
171 unsigned short imrb_value;
172 unsigned char pim_value;
175 struct work_struct task; /* task structure for scheduling bh */
184 int dcd_chkcount; /* check counts to prevent */
185 int cts_chkcount; /* too many IRQs if a signal */
186 int dsr_chkcount; /* is floating */
197 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
199 char device_name[25]; /* device instance name */
201 unsigned int io_base; /* base I/O address of adapter */
202 unsigned int irq_level;
204 MGSL_PARAMS params; /* communications parameters */
206 unsigned char serial_signals; /* current serial signal states */
208 bool irq_occurred; /* for diagnostics use */
210 unsigned int init_error; /* startup error (DIAGS) */
213 bool drop_rts_on_tx_done;
215 struct _input_signal_events input_signal_events;
218 struct pcmcia_device *p_dev;
221 /* SPPP/Cisco HDLC device parts */
225 #if SYNCLINK_GENERIC_HDLC
226 struct net_device *netdev;
231 #define MGSLPC_MAGIC 0x5402
234 * The size of the serial xmit buffer is 1 page, or 4096 bytes
236 #define TXBUFSIZE 4096
239 #define CHA 0x00 /* channel A offset */
240 #define CHB 0x40 /* channel B offset */
243 * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
290 #define IRQ_BREAK_ON BIT15 // rx break detected
291 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
292 #define IRQ_ALLSENT BIT13 // all sent
293 #define IRQ_UNDERRUN BIT12 // transmit data underrun
294 #define IRQ_TIMER BIT11 // timer interrupt
295 #define IRQ_CTS BIT10 // CTS status change
296 #define IRQ_TXREPEAT BIT9 // tx message repeat
297 #define IRQ_TXFIFO BIT8 // transmit pool ready
298 #define IRQ_RXEOM BIT7 // receive message end
299 #define IRQ_EXITHUNT BIT6 // receive frame start
300 #define IRQ_RXTIME BIT6 // rx char timeout
301 #define IRQ_DCD BIT2 // carrier detect status change
302 #define IRQ_OVERRUN BIT1 // receive frame overflow
303 #define IRQ_RXFIFO BIT0 // receive pool full
307 #define XFW BIT6 // transmit FIFO write enable
308 #define CEC BIT2 // command executing
309 #define CTS BIT1 // CTS state
314 #define PVR_AUTOCTS BIT3
315 #define PVR_RS232 0x20 /* 0010b */
316 #define PVR_V35 0xe0 /* 1110b */
317 #define PVR_RS422 0x40 /* 0100b */
319 /* Register access functions */
321 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
322 #define read_reg(info, reg) inb((info)->io_base + (reg))
324 #define read_reg16(info, reg) inw((info)->io_base + (reg))
325 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
327 #define set_reg_bits(info, reg, mask) \
328 write_reg(info, (reg), \
329 (unsigned char) (read_reg(info, (reg)) | (mask)))
330 #define clear_reg_bits(info, reg, mask) \
331 write_reg(info, (reg), \
332 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
334 * interrupt enable/disable routines
336 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
338 if (channel == CHA) {
339 info->imra_value |= mask;
340 write_reg16(info, CHA + IMR, info->imra_value);
342 info->imrb_value |= mask;
343 write_reg16(info, CHB + IMR, info->imrb_value);
346 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
348 if (channel == CHA) {
349 info->imra_value &= ~mask;
350 write_reg16(info, CHA + IMR, info->imra_value);
352 info->imrb_value &= ~mask;
353 write_reg16(info, CHB + IMR, info->imrb_value);
357 #define port_irq_disable(info, mask) \
358 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
360 #define port_irq_enable(info, mask) \
361 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
363 static void rx_start(MGSLPC_INFO *info);
364 static void rx_stop(MGSLPC_INFO *info);
366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
367 static void tx_stop(MGSLPC_INFO *info);
368 static void tx_set_idle(MGSLPC_INFO *info);
370 static void get_signals(MGSLPC_INFO *info);
371 static void set_signals(MGSLPC_INFO *info);
373 static void reset_device(MGSLPC_INFO *info);
375 static void hdlc_mode(MGSLPC_INFO *info);
376 static void async_mode(MGSLPC_INFO *info);
378 static void tx_timeout(struct timer_list *t);
380 static int carrier_raised(struct tty_port *port);
381 static void dtr_rts(struct tty_port *port, int onoff);
383 #if SYNCLINK_GENERIC_HDLC
384 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
385 static void hdlcdev_tx_done(MGSLPC_INFO *info);
386 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
387 static int hdlcdev_init(MGSLPC_INFO *info);
388 static void hdlcdev_exit(MGSLPC_INFO *info);
391 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
393 static bool register_test(MGSLPC_INFO *info);
394 static bool irq_test(MGSLPC_INFO *info);
395 static int adapter_test(MGSLPC_INFO *info);
397 static int claim_resources(MGSLPC_INFO *info);
398 static void release_resources(MGSLPC_INFO *info);
399 static int mgslpc_add_device(MGSLPC_INFO *info);
400 static void mgslpc_remove_device(MGSLPC_INFO *info);
402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
403 static void rx_reset_buffers(MGSLPC_INFO *info);
404 static int rx_alloc_buffers(MGSLPC_INFO *info);
405 static void rx_free_buffers(MGSLPC_INFO *info);
407 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
410 * Bottom half interrupt handlers
412 static void bh_handler(struct work_struct *work);
413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
414 static void bh_status(MGSLPC_INFO *info);
419 static int tiocmget(struct tty_struct *tty);
420 static int tiocmset(struct tty_struct *tty,
421 unsigned int set, unsigned int clear);
422 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
423 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
425 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
426 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
428 static int tx_abort(MGSLPC_INFO *info);
429 static int set_rxenable(MGSLPC_INFO *info, int enable);
430 static int wait_events(MGSLPC_INFO *info, int __user *mask);
432 static MGSLPC_INFO *mgslpc_device_list = NULL;
433 static int mgslpc_device_count = 0;
436 * Set this param to non-zero to load eax with the
437 * .text section address and breakpoint on module load.
438 * This is useful for use with gdb and add-symbol-file command.
440 static bool break_on_load;
443 * Driver major number, defaults to zero to get auto
444 * assigned major number. May be forced as module parameter.
446 static int ttymajor=0;
448 static int debug_level = 0;
449 static int maxframe[MAX_DEVICE_COUNT] = {0,};
451 module_param(break_on_load, bool, 0);
452 module_param(ttymajor, int, 0);
453 module_param(debug_level, int, 0);
454 module_param_array(maxframe, int, NULL, 0);
456 MODULE_LICENSE("GPL");
458 static char *driver_name = "SyncLink PC Card driver";
459 static char *driver_version = "$Revision: 4.34 $";
461 static struct tty_driver *serial_driver;
463 /* number of characters left in xmit buffer before we ask for more */
464 #define WAKEUP_CHARS 256
466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
469 /* PCMCIA prototypes */
471 static int mgslpc_config(struct pcmcia_device *link);
472 static void mgslpc_release(u_long arg);
473 static void mgslpc_detach(struct pcmcia_device *p_dev);
476 * 1st function defined in .text section. Calling this function in
477 * init_module() followed by a breakpoint allows a remote debugger
478 * (gdb) to get the .text address for the add-symbol-file command.
479 * This allows remote debugging of dynamically loadable modules.
481 static void* mgslpc_get_text_ptr(void)
483 return mgslpc_get_text_ptr;
487 * line discipline callback wrappers
489 * The wrappers maintain line discipline references
490 * while calling into the line discipline.
492 * ldisc_receive_buf - pass receive data to line discipline
495 static void ldisc_receive_buf(struct tty_struct *tty,
496 const __u8 *data, char *flags, int count)
498 struct tty_ldisc *ld;
501 ld = tty_ldisc_ref(tty);
503 if (ld->ops->receive_buf)
504 ld->ops->receive_buf(tty, data, flags, count);
509 static const struct tty_port_operations mgslpc_port_ops = {
510 .carrier_raised = carrier_raised,
514 static int mgslpc_probe(struct pcmcia_device *link)
519 if (debug_level >= DEBUG_LEVEL_INFO)
520 printk("mgslpc_attach\n");
522 info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
524 printk("Error can't allocate device instance data\n");
528 info->magic = MGSLPC_MAGIC;
529 tty_port_init(&info->port);
530 info->port.ops = &mgslpc_port_ops;
531 INIT_WORK(&info->task, bh_handler);
532 info->max_frame_size = 4096;
533 init_waitqueue_head(&info->status_event_wait_q);
534 init_waitqueue_head(&info->event_wait_q);
535 spin_lock_init(&info->lock);
536 spin_lock_init(&info->netlock);
537 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
538 info->idle_mode = HDLC_TXIDLE_FLAGS;
539 info->imra_value = 0xffff;
540 info->imrb_value = 0xffff;
541 info->pim_value = 0xff;
546 /* Initialize the struct pcmcia_device structure */
548 ret = mgslpc_config(link);
552 ret = mgslpc_add_device(info);
559 mgslpc_release((u_long)link);
561 tty_port_destroy(&info->port);
566 /* Card has been inserted.
569 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
571 return pcmcia_request_io(p_dev);
574 static int mgslpc_config(struct pcmcia_device *link)
576 MGSLPC_INFO *info = link->priv;
579 if (debug_level >= DEBUG_LEVEL_INFO)
580 printk("mgslpc_config(0x%p)\n", link);
582 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
584 ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
588 link->config_index = 8;
589 link->config_regs = PRESENT_OPTION;
591 ret = pcmcia_request_irq(link, mgslpc_isr);
594 ret = pcmcia_enable_device(link);
598 info->io_base = link->resource[0]->start;
599 info->irq_level = link->irq;
603 mgslpc_release((u_long)link);
607 /* Card has been removed.
608 * Unregister device and release PCMCIA configuration.
609 * If device is open, postpone until it is closed.
611 static void mgslpc_release(u_long arg)
613 struct pcmcia_device *link = (struct pcmcia_device *)arg;
615 if (debug_level >= DEBUG_LEVEL_INFO)
616 printk("mgslpc_release(0x%p)\n", link);
618 pcmcia_disable_device(link);
621 static void mgslpc_detach(struct pcmcia_device *link)
623 if (debug_level >= DEBUG_LEVEL_INFO)
624 printk("mgslpc_detach(0x%p)\n", link);
626 ((MGSLPC_INFO *)link->priv)->stop = 1;
627 mgslpc_release((u_long)link);
629 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
632 static int mgslpc_suspend(struct pcmcia_device *link)
634 MGSLPC_INFO *info = link->priv;
641 static int mgslpc_resume(struct pcmcia_device *link)
643 MGSLPC_INFO *info = link->priv;
651 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
652 char *name, const char *routine)
654 #ifdef MGSLPC_PARANOIA_CHECK
655 static const char *badmagic =
656 "Warning: bad magic number for mgsl struct (%s) in %s\n";
657 static const char *badinfo =
658 "Warning: null mgslpc_info for (%s) in %s\n";
661 printk(badinfo, name, routine);
664 if (info->magic != MGSLPC_MAGIC) {
665 printk(badmagic, name, routine);
676 #define CMD_RXFIFO BIT7 // release current rx FIFO
677 #define CMD_RXRESET BIT6 // receiver reset
678 #define CMD_RXFIFO_READ BIT5
679 #define CMD_START_TIMER BIT4
680 #define CMD_TXFIFO BIT3 // release current tx FIFO
681 #define CMD_TXEOM BIT1 // transmit end message
682 #define CMD_TXRESET BIT0 // transmit reset
684 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
687 /* wait for command completion */
688 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
696 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
698 wait_command_complete(info, channel);
699 write_reg(info, (unsigned char) (channel + CMDR), cmd);
702 static void tx_pause(struct tty_struct *tty)
704 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
707 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
709 if (debug_level >= DEBUG_LEVEL_INFO)
710 printk("tx_pause(%s)\n", info->device_name);
712 spin_lock_irqsave(&info->lock, flags);
713 if (info->tx_enabled)
715 spin_unlock_irqrestore(&info->lock, flags);
718 static void tx_release(struct tty_struct *tty)
720 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
723 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
725 if (debug_level >= DEBUG_LEVEL_INFO)
726 printk("tx_release(%s)\n", info->device_name);
728 spin_lock_irqsave(&info->lock, flags);
729 if (!info->tx_enabled)
731 spin_unlock_irqrestore(&info->lock, flags);
734 /* Return next bottom half action to perform.
735 * or 0 if nothing to do.
737 static int bh_action(MGSLPC_INFO *info)
742 spin_lock_irqsave(&info->lock, flags);
744 if (info->pending_bh & BH_RECEIVE) {
745 info->pending_bh &= ~BH_RECEIVE;
747 } else if (info->pending_bh & BH_TRANSMIT) {
748 info->pending_bh &= ~BH_TRANSMIT;
750 } else if (info->pending_bh & BH_STATUS) {
751 info->pending_bh &= ~BH_STATUS;
756 /* Mark BH routine as complete */
757 info->bh_running = false;
758 info->bh_requested = false;
761 spin_unlock_irqrestore(&info->lock, flags);
766 static void bh_handler(struct work_struct *work)
768 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
769 struct tty_struct *tty;
772 if (debug_level >= DEBUG_LEVEL_BH)
773 printk("%s(%d):bh_handler(%s) entry\n",
774 __FILE__,__LINE__,info->device_name);
776 info->bh_running = true;
777 tty = tty_port_tty_get(&info->port);
779 while((action = bh_action(info)) != 0) {
781 /* Process work item */
782 if (debug_level >= DEBUG_LEVEL_BH)
783 printk("%s(%d):bh_handler() work item action=%d\n",
784 __FILE__,__LINE__,action);
789 while(rx_get_frame(info, tty));
792 bh_transmit(info, tty);
798 /* unknown work item ID */
799 printk("Unknown work item ID=%08X!\n", action);
805 if (debug_level >= DEBUG_LEVEL_BH)
806 printk("%s(%d):bh_handler(%s) exit\n",
807 __FILE__,__LINE__,info->device_name);
810 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
812 if (debug_level >= DEBUG_LEVEL_BH)
813 printk("bh_transmit() entry on %s\n", info->device_name);
819 static void bh_status(MGSLPC_INFO *info)
821 info->ri_chkcount = 0;
822 info->dsr_chkcount = 0;
823 info->dcd_chkcount = 0;
824 info->cts_chkcount = 0;
827 /* eom: non-zero = end of frame */
828 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
830 unsigned char data[2];
831 unsigned char fifo_count, read_count, i;
832 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
834 if (debug_level >= DEBUG_LEVEL_ISR)
835 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
837 if (!info->rx_enabled)
840 if (info->rx_frame_count >= info->rx_buf_count) {
841 /* no more free buffers */
842 issue_command(info, CHA, CMD_RXRESET);
843 info->pending_bh |= BH_RECEIVE;
844 info->rx_overflow = true;
845 info->icount.buf_overrun++;
850 /* end of frame, get FIFO count from RBCL register */
851 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
858 if (fifo_count == 1) {
860 data[0] = read_reg(info, CHA + RXFIFO);
863 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
865 fifo_count -= read_count;
866 if (!fifo_count && eom)
867 buf->status = data[--read_count];
869 for (i = 0; i < read_count; i++) {
870 if (buf->count >= info->max_frame_size) {
871 /* frame too large, reset receiver and reset current buffer */
872 issue_command(info, CHA, CMD_RXRESET);
876 *(buf->data + buf->count) = data[i];
879 } while (fifo_count);
882 info->pending_bh |= BH_RECEIVE;
883 info->rx_frame_count++;
885 if (info->rx_put >= info->rx_buf_count)
888 issue_command(info, CHA, CMD_RXFIFO);
891 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
893 struct tty_port *port = &info->port;
894 unsigned char data, status, flag;
897 struct mgsl_icount *icount = &info->icount;
900 /* early termination, get FIFO count from RBCL register */
901 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
903 /* Zero fifo count could mean 0 or 32 bytes available.
904 * If BIT5 of STAR is set then at least 1 byte is available.
906 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
911 tty_buffer_request_room(port, fifo_count);
912 /* Flush received async data to receive data buffer. */
914 data = read_reg(info, CHA + RXFIFO);
915 status = read_reg(info, CHA + RXFIFO);
921 // if no frameing/crc error then save data
923 // BIT6:framing error
925 if (status & (BIT7 + BIT6)) {
931 /* discard char if tty control flags say so */
932 if (status & info->ignore_status_mask)
935 status &= info->read_status_mask;
939 else if (status & BIT6)
942 work += tty_insert_flip_char(port, data, flag);
944 issue_command(info, CHA, CMD_RXFIFO);
946 if (debug_level >= DEBUG_LEVEL_ISR) {
947 printk("%s(%d):rx_ready_async",
949 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
950 __FILE__,__LINE__,icount->rx,icount->brk,
951 icount->parity,icount->frame,icount->overrun);
955 tty_flip_buffer_push(port);
959 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
961 if (!info->tx_active)
964 info->tx_active = false;
965 info->tx_aborting = false;
967 if (info->params.mode == MGSL_MODE_ASYNC)
970 info->tx_count = info->tx_put = info->tx_get = 0;
971 del_timer(&info->tx_timer);
973 if (info->drop_rts_on_tx_done) {
975 if (info->serial_signals & SerialSignal_RTS) {
976 info->serial_signals &= ~SerialSignal_RTS;
979 info->drop_rts_on_tx_done = false;
982 #if SYNCLINK_GENERIC_HDLC
984 hdlcdev_tx_done(info);
988 if (tty && (tty->flow.stopped || tty->hw_stopped)) {
992 info->pending_bh |= BH_TRANSMIT;
996 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
998 unsigned char fifo_count = 32;
1001 if (debug_level >= DEBUG_LEVEL_ISR)
1002 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1004 if (info->params.mode == MGSL_MODE_HDLC) {
1005 if (!info->tx_active)
1008 if (tty && (tty->flow.stopped || tty->hw_stopped)) {
1012 if (!info->tx_count)
1013 info->tx_active = false;
1016 if (!info->tx_count)
1019 while (info->tx_count && fifo_count) {
1020 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1023 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1025 write_reg16(info, CHA + TXFIFO,
1026 *((unsigned short*)(info->tx_buf + info->tx_get)));
1028 info->tx_count -= c;
1029 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1033 if (info->params.mode == MGSL_MODE_ASYNC) {
1034 if (info->tx_count < WAKEUP_CHARS)
1035 info->pending_bh |= BH_TRANSMIT;
1036 issue_command(info, CHA, CMD_TXFIFO);
1039 issue_command(info, CHA, CMD_TXFIFO);
1041 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1045 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1048 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1049 irq_disable(info, CHB, IRQ_CTS);
1051 if (info->serial_signals & SerialSignal_CTS)
1052 info->input_signal_events.cts_up++;
1054 info->input_signal_events.cts_down++;
1055 wake_up_interruptible(&info->status_event_wait_q);
1056 wake_up_interruptible(&info->event_wait_q);
1058 if (tty && tty_port_cts_enabled(&info->port)) {
1059 if (tty->hw_stopped) {
1060 if (info->serial_signals & SerialSignal_CTS) {
1061 if (debug_level >= DEBUG_LEVEL_ISR)
1062 printk("CTS tx start...");
1063 tty->hw_stopped = 0;
1064 tx_start(info, tty);
1065 info->pending_bh |= BH_TRANSMIT;
1069 if (!(info->serial_signals & SerialSignal_CTS)) {
1070 if (debug_level >= DEBUG_LEVEL_ISR)
1071 printk("CTS tx stop...");
1072 tty->hw_stopped = 1;
1077 info->pending_bh |= BH_STATUS;
1080 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1083 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1084 irq_disable(info, CHB, IRQ_DCD);
1086 if (info->serial_signals & SerialSignal_DCD) {
1087 info->input_signal_events.dcd_up++;
1090 info->input_signal_events.dcd_down++;
1091 #if SYNCLINK_GENERIC_HDLC
1092 if (info->netcount) {
1093 if (info->serial_signals & SerialSignal_DCD)
1094 netif_carrier_on(info->netdev);
1096 netif_carrier_off(info->netdev);
1099 wake_up_interruptible(&info->status_event_wait_q);
1100 wake_up_interruptible(&info->event_wait_q);
1102 if (tty_port_check_carrier(&info->port)) {
1103 if (debug_level >= DEBUG_LEVEL_ISR)
1104 printk("%s CD now %s...", info->device_name,
1105 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1106 if (info->serial_signals & SerialSignal_DCD)
1107 wake_up_interruptible(&info->port.open_wait);
1109 if (debug_level >= DEBUG_LEVEL_ISR)
1110 printk("doing serial hangup...");
1115 info->pending_bh |= BH_STATUS;
1118 static void dsr_change(MGSLPC_INFO *info)
1121 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1122 port_irq_disable(info, PVR_DSR);
1124 if (info->serial_signals & SerialSignal_DSR)
1125 info->input_signal_events.dsr_up++;
1127 info->input_signal_events.dsr_down++;
1128 wake_up_interruptible(&info->status_event_wait_q);
1129 wake_up_interruptible(&info->event_wait_q);
1130 info->pending_bh |= BH_STATUS;
1133 static void ri_change(MGSLPC_INFO *info)
1136 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1137 port_irq_disable(info, PVR_RI);
1139 if (info->serial_signals & SerialSignal_RI)
1140 info->input_signal_events.ri_up++;
1142 info->input_signal_events.ri_down++;
1143 wake_up_interruptible(&info->status_event_wait_q);
1144 wake_up_interruptible(&info->event_wait_q);
1145 info->pending_bh |= BH_STATUS;
1148 /* Interrupt service routine entry point.
1152 * irq interrupt number that caused interrupt
1153 * dev_id device ID supplied during interrupt registration
1155 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1157 MGSLPC_INFO *info = dev_id;
1158 struct tty_struct *tty;
1160 unsigned char gis, pis;
1163 if (debug_level >= DEBUG_LEVEL_ISR)
1164 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1166 if (!(info->p_dev->_locked))
1169 tty = tty_port_tty_get(&info->port);
1171 spin_lock(&info->lock);
1173 while ((gis = read_reg(info, CHA + GIS))) {
1174 if (debug_level >= DEBUG_LEVEL_ISR)
1175 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1177 if ((gis & 0x70) || count > 1000) {
1178 printk("synclink_cs:hardware failed or ejected\n");
1183 if (gis & (BIT1 | BIT0)) {
1184 isr = read_reg16(info, CHB + ISR);
1186 dcd_change(info, tty);
1188 cts_change(info, tty);
1190 if (gis & (BIT3 | BIT2))
1192 isr = read_reg16(info, CHA + ISR);
1193 if (isr & IRQ_TIMER) {
1194 info->irq_occurred = true;
1195 irq_disable(info, CHA, IRQ_TIMER);
1199 if (isr & IRQ_EXITHUNT) {
1200 info->icount.exithunt++;
1201 wake_up_interruptible(&info->event_wait_q);
1203 if (isr & IRQ_BREAK_ON) {
1205 if (info->port.flags & ASYNC_SAK)
1208 if (isr & IRQ_RXTIME) {
1209 issue_command(info, CHA, CMD_RXFIFO_READ);
1211 if (isr & (IRQ_RXEOM | IRQ_RXFIFO)) {
1212 if (info->params.mode == MGSL_MODE_HDLC)
1213 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1215 rx_ready_async(info, isr & IRQ_RXEOM);
1219 if (isr & IRQ_UNDERRUN) {
1220 if (info->tx_aborting)
1221 info->icount.txabort++;
1223 info->icount.txunder++;
1226 else if (isr & IRQ_ALLSENT) {
1227 info->icount.txok++;
1230 else if (isr & IRQ_TXFIFO)
1231 tx_ready(info, tty);
1234 pis = read_reg(info, CHA + PIS);
1242 /* Request bottom half processing if there's something
1243 * for it to do and the bh is not already running
1246 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1247 if (debug_level >= DEBUG_LEVEL_ISR)
1248 printk("%s(%d):%s queueing bh task.\n",
1249 __FILE__,__LINE__,info->device_name);
1250 schedule_work(&info->task);
1251 info->bh_requested = true;
1254 spin_unlock(&info->lock);
1257 if (debug_level >= DEBUG_LEVEL_ISR)
1258 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1259 __FILE__, __LINE__, info->irq_level);
1264 /* Initialize and start device.
1266 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1270 if (debug_level >= DEBUG_LEVEL_INFO)
1271 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1273 if (tty_port_initialized(&info->port))
1276 if (!info->tx_buf) {
1277 /* allocate a page of memory for a transmit buffer */
1278 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1279 if (!info->tx_buf) {
1280 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1281 __FILE__, __LINE__, info->device_name);
1286 info->pending_bh = 0;
1288 memset(&info->icount, 0, sizeof(info->icount));
1290 timer_setup(&info->tx_timer, tx_timeout, 0);
1292 /* Allocate and claim adapter resources */
1293 retval = claim_resources(info);
1295 /* perform existence check and diagnostics */
1297 retval = adapter_test(info);
1300 if (capable(CAP_SYS_ADMIN) && tty)
1301 set_bit(TTY_IO_ERROR, &tty->flags);
1302 release_resources(info);
1306 /* program hardware for current parameters */
1307 mgslpc_change_params(info, tty);
1310 clear_bit(TTY_IO_ERROR, &tty->flags);
1312 tty_port_set_initialized(&info->port, 1);
1317 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1319 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1321 unsigned long flags;
1323 if (!tty_port_initialized(&info->port))
1326 if (debug_level >= DEBUG_LEVEL_INFO)
1327 printk("%s(%d):mgslpc_shutdown(%s)\n",
1328 __FILE__, __LINE__, info->device_name);
1330 /* clear status wait queue because status changes */
1331 /* can't happen after shutting down the hardware */
1332 wake_up_interruptible(&info->status_event_wait_q);
1333 wake_up_interruptible(&info->event_wait_q);
1335 del_timer_sync(&info->tx_timer);
1338 free_page((unsigned long) info->tx_buf);
1339 info->tx_buf = NULL;
1342 spin_lock_irqsave(&info->lock, flags);
1347 /* TODO:disable interrupts instead of reset to preserve signal states */
1350 if (!tty || C_HUPCL(tty)) {
1351 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1355 spin_unlock_irqrestore(&info->lock, flags);
1357 release_resources(info);
1360 set_bit(TTY_IO_ERROR, &tty->flags);
1362 tty_port_set_initialized(&info->port, 0);
1365 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1367 unsigned long flags;
1369 spin_lock_irqsave(&info->lock, flags);
1373 info->tx_count = info->tx_put = info->tx_get = 0;
1375 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1382 info->dcd_chkcount = 0;
1383 info->cts_chkcount = 0;
1384 info->ri_chkcount = 0;
1385 info->dsr_chkcount = 0;
1387 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1388 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1391 if (info->netcount || (tty && C_CREAD(tty)))
1394 spin_unlock_irqrestore(&info->lock, flags);
1397 /* Reconfigure adapter based on new parameters
1399 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1407 if (debug_level >= DEBUG_LEVEL_INFO)
1408 printk("%s(%d):mgslpc_change_params(%s)\n",
1409 __FILE__, __LINE__, info->device_name);
1411 cflag = tty->termios.c_cflag;
1413 /* if B0 rate (hangup) specified then negate RTS and DTR */
1414 /* otherwise assert RTS and DTR */
1416 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1418 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1420 /* byte size and parity */
1422 info->params.data_bits = tty_get_char_size(cflag);
1425 info->params.stop_bits = 2;
1427 info->params.stop_bits = 1;
1429 info->params.parity = ASYNC_PARITY_NONE;
1430 if (cflag & PARENB) {
1432 info->params.parity = ASYNC_PARITY_ODD;
1434 info->params.parity = ASYNC_PARITY_EVEN;
1437 info->params.parity = ASYNC_PARITY_SPACE;
1441 /* calculate number of jiffies to transmit a full
1442 * FIFO (32 bytes) at specified data rate
1444 bits_per_char = info->params.data_bits +
1445 info->params.stop_bits + 1;
1447 /* if port data rate is set to 460800 or less then
1448 * allow tty settings to override, otherwise keep the
1449 * current data rate.
1451 if (info->params.data_rate <= 460800) {
1452 info->params.data_rate = tty_get_baud_rate(tty);
1455 if (info->params.data_rate) {
1456 info->timeout = (32*HZ*bits_per_char) /
1457 info->params.data_rate;
1459 info->timeout += HZ/50; /* Add .02 seconds of slop */
1461 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
1462 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
1464 /* process tty input control flags */
1466 info->read_status_mask = 0;
1468 info->read_status_mask |= BIT7 | BIT6;
1470 info->ignore_status_mask |= BIT7 | BIT6;
1472 mgslpc_program_hw(info, tty);
1475 /* Add a character to the transmit buffer
1477 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1479 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1480 unsigned long flags;
1482 if (debug_level >= DEBUG_LEVEL_INFO) {
1483 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1484 __FILE__, __LINE__, ch, info->device_name);
1487 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1493 spin_lock_irqsave(&info->lock, flags);
1495 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1496 if (info->tx_count < TXBUFSIZE - 1) {
1497 info->tx_buf[info->tx_put++] = ch;
1498 info->tx_put &= TXBUFSIZE-1;
1503 spin_unlock_irqrestore(&info->lock, flags);
1507 /* Enable transmitter so remaining characters in the
1508 * transmit buffer are sent.
1510 static void mgslpc_flush_chars(struct tty_struct *tty)
1512 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1513 unsigned long flags;
1515 if (debug_level >= DEBUG_LEVEL_INFO)
1516 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1517 __FILE__, __LINE__, info->device_name, info->tx_count);
1519 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1522 if (info->tx_count <= 0 || tty->flow.stopped ||
1523 tty->hw_stopped || !info->tx_buf)
1526 if (debug_level >= DEBUG_LEVEL_INFO)
1527 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1528 __FILE__, __LINE__, info->device_name);
1530 spin_lock_irqsave(&info->lock, flags);
1531 if (!info->tx_active)
1532 tx_start(info, tty);
1533 spin_unlock_irqrestore(&info->lock, flags);
1536 /* Send a block of data
1540 * tty pointer to tty information structure
1541 * buf pointer to buffer containing send data
1542 * count size of send data in bytes
1544 * Returns: number of characters written
1546 static int mgslpc_write(struct tty_struct * tty,
1547 const unsigned char *buf, int count)
1550 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1551 unsigned long flags;
1553 if (debug_level >= DEBUG_LEVEL_INFO)
1554 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1555 __FILE__, __LINE__, info->device_name, count);
1557 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1561 if (info->params.mode == MGSL_MODE_HDLC) {
1562 if (count > TXBUFSIZE) {
1566 if (info->tx_active)
1568 else if (info->tx_count)
1574 min(TXBUFSIZE - info->tx_count - 1,
1575 TXBUFSIZE - info->tx_put));
1579 memcpy(info->tx_buf + info->tx_put, buf, c);
1581 spin_lock_irqsave(&info->lock, flags);
1582 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1583 info->tx_count += c;
1584 spin_unlock_irqrestore(&info->lock, flags);
1591 if (info->tx_count && !tty->flow.stopped && !tty->hw_stopped) {
1592 spin_lock_irqsave(&info->lock, flags);
1593 if (!info->tx_active)
1594 tx_start(info, tty);
1595 spin_unlock_irqrestore(&info->lock, flags);
1598 if (debug_level >= DEBUG_LEVEL_INFO)
1599 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1600 __FILE__, __LINE__, info->device_name, ret);
1604 /* Return the count of free bytes in transmit buffer
1606 static unsigned int mgslpc_write_room(struct tty_struct *tty)
1608 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1611 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1614 if (info->params.mode == MGSL_MODE_HDLC) {
1615 /* HDLC (frame oriented) mode */
1616 if (info->tx_active)
1619 return HDLC_MAX_FRAME_SIZE;
1621 ret = TXBUFSIZE - info->tx_count - 1;
1626 if (debug_level >= DEBUG_LEVEL_INFO)
1627 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1628 __FILE__, __LINE__, info->device_name, ret);
1632 /* Return the count of bytes in transmit buffer
1634 static unsigned int mgslpc_chars_in_buffer(struct tty_struct *tty)
1636 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1639 if (debug_level >= DEBUG_LEVEL_INFO)
1640 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1641 __FILE__, __LINE__, info->device_name);
1643 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1646 if (info->params.mode == MGSL_MODE_HDLC)
1647 rc = info->tx_active ? info->max_frame_size : 0;
1649 rc = info->tx_count;
1651 if (debug_level >= DEBUG_LEVEL_INFO)
1652 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%u\n",
1653 __FILE__, __LINE__, info->device_name, rc);
1658 /* Discard all data in the send buffer
1660 static void mgslpc_flush_buffer(struct tty_struct *tty)
1662 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1663 unsigned long flags;
1665 if (debug_level >= DEBUG_LEVEL_INFO)
1666 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1667 __FILE__, __LINE__, info->device_name);
1669 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1672 spin_lock_irqsave(&info->lock, flags);
1673 info->tx_count = info->tx_put = info->tx_get = 0;
1674 del_timer(&info->tx_timer);
1675 spin_unlock_irqrestore(&info->lock, flags);
1677 wake_up_interruptible(&tty->write_wait);
1681 /* Send a high-priority XON/XOFF character
1683 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1685 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1686 unsigned long flags;
1688 if (debug_level >= DEBUG_LEVEL_INFO)
1689 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1690 __FILE__, __LINE__, info->device_name, ch);
1692 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1697 spin_lock_irqsave(&info->lock, flags);
1698 if (!info->tx_enabled)
1699 tx_start(info, tty);
1700 spin_unlock_irqrestore(&info->lock, flags);
1704 /* Signal remote device to throttle send data (our receive data)
1706 static void mgslpc_throttle(struct tty_struct * tty)
1708 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1709 unsigned long flags;
1711 if (debug_level >= DEBUG_LEVEL_INFO)
1712 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1713 __FILE__, __LINE__, info->device_name);
1715 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1719 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1721 if (C_CRTSCTS(tty)) {
1722 spin_lock_irqsave(&info->lock, flags);
1723 info->serial_signals &= ~SerialSignal_RTS;
1725 spin_unlock_irqrestore(&info->lock, flags);
1729 /* Signal remote device to stop throttling send data (our receive data)
1731 static void mgslpc_unthrottle(struct tty_struct * tty)
1733 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1734 unsigned long flags;
1736 if (debug_level >= DEBUG_LEVEL_INFO)
1737 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1738 __FILE__, __LINE__, info->device_name);
1740 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1747 mgslpc_send_xchar(tty, START_CHAR(tty));
1750 if (C_CRTSCTS(tty)) {
1751 spin_lock_irqsave(&info->lock, flags);
1752 info->serial_signals |= SerialSignal_RTS;
1754 spin_unlock_irqrestore(&info->lock, flags);
1758 /* get the current serial statistics
1760 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1763 if (debug_level >= DEBUG_LEVEL_INFO)
1764 printk("get_params(%s)\n", info->device_name);
1766 memset(&info->icount, 0, sizeof(info->icount));
1768 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1775 /* get the current serial parameters
1777 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1780 if (debug_level >= DEBUG_LEVEL_INFO)
1781 printk("get_params(%s)\n", info->device_name);
1782 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1788 /* set the serial parameters
1792 * info pointer to device instance data
1793 * new_params user buffer containing new serial params
1795 * Returns: 0 if success, otherwise error code
1797 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1799 unsigned long flags;
1800 MGSL_PARAMS tmp_params;
1803 if (debug_level >= DEBUG_LEVEL_INFO)
1804 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1806 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1808 if (debug_level >= DEBUG_LEVEL_INFO)
1809 printk("%s(%d):set_params(%s) user buffer copy failed\n",
1810 __FILE__, __LINE__, info->device_name);
1814 spin_lock_irqsave(&info->lock, flags);
1815 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1816 spin_unlock_irqrestore(&info->lock, flags);
1818 mgslpc_change_params(info, tty);
1823 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1826 if (debug_level >= DEBUG_LEVEL_INFO)
1827 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1828 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1834 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1836 unsigned long flags;
1837 if (debug_level >= DEBUG_LEVEL_INFO)
1838 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1839 spin_lock_irqsave(&info->lock, flags);
1840 info->idle_mode = idle_mode;
1842 spin_unlock_irqrestore(&info->lock, flags);
1846 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1849 if (debug_level >= DEBUG_LEVEL_INFO)
1850 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1851 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1857 static int set_interface(MGSLPC_INFO * info, int if_mode)
1859 unsigned long flags;
1861 if (debug_level >= DEBUG_LEVEL_INFO)
1862 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1863 spin_lock_irqsave(&info->lock, flags);
1864 info->if_mode = if_mode;
1866 val = read_reg(info, PVR) & 0x0f;
1867 switch (info->if_mode)
1869 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1870 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1871 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1873 write_reg(info, PVR, val);
1875 spin_unlock_irqrestore(&info->lock, flags);
1879 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1881 unsigned long flags;
1883 if (debug_level >= DEBUG_LEVEL_INFO)
1884 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1886 spin_lock_irqsave(&info->lock, flags);
1888 if (!info->tx_enabled)
1889 tx_start(info, tty);
1891 if (info->tx_enabled)
1894 spin_unlock_irqrestore(&info->lock, flags);
1898 static int tx_abort(MGSLPC_INFO * info)
1900 unsigned long flags;
1902 if (debug_level >= DEBUG_LEVEL_INFO)
1903 printk("tx_abort(%s)\n", info->device_name);
1905 spin_lock_irqsave(&info->lock, flags);
1906 if (info->tx_active && info->tx_count &&
1907 info->params.mode == MGSL_MODE_HDLC) {
1908 /* clear data count so FIFO is not filled on next IRQ.
1909 * This results in underrun and abort transmission.
1911 info->tx_count = info->tx_put = info->tx_get = 0;
1912 info->tx_aborting = true;
1914 spin_unlock_irqrestore(&info->lock, flags);
1918 static int set_rxenable(MGSLPC_INFO * info, int enable)
1920 unsigned long flags;
1922 if (debug_level >= DEBUG_LEVEL_INFO)
1923 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1925 spin_lock_irqsave(&info->lock, flags);
1927 if (!info->rx_enabled)
1930 if (info->rx_enabled)
1933 spin_unlock_irqrestore(&info->lock, flags);
1937 /* wait for specified event to occur
1939 * Arguments: info pointer to device instance data
1940 * mask pointer to bitmask of events to wait for
1941 * Return Value: 0 if successful and bit mask updated with
1942 * of events triggerred,
1943 * otherwise error code
1945 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1947 unsigned long flags;
1950 struct mgsl_icount cprev, cnow;
1953 struct _input_signal_events oldsigs, newsigs;
1954 DECLARE_WAITQUEUE(wait, current);
1956 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1960 if (debug_level >= DEBUG_LEVEL_INFO)
1961 printk("wait_events(%s,%d)\n", info->device_name, mask);
1963 spin_lock_irqsave(&info->lock, flags);
1965 /* return immediately if state matches requested events */
1967 s = info->serial_signals;
1969 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1970 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1971 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1972 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1974 spin_unlock_irqrestore(&info->lock, flags);
1978 /* save current irq counts */
1979 cprev = info->icount;
1980 oldsigs = info->input_signal_events;
1982 if ((info->params.mode == MGSL_MODE_HDLC) &&
1983 (mask & MgslEvent_ExitHuntMode))
1984 irq_enable(info, CHA, IRQ_EXITHUNT);
1986 set_current_state(TASK_INTERRUPTIBLE);
1987 add_wait_queue(&info->event_wait_q, &wait);
1989 spin_unlock_irqrestore(&info->lock, flags);
1994 if (signal_pending(current)) {
1999 /* get current irq counts */
2000 spin_lock_irqsave(&info->lock, flags);
2001 cnow = info->icount;
2002 newsigs = info->input_signal_events;
2003 set_current_state(TASK_INTERRUPTIBLE);
2004 spin_unlock_irqrestore(&info->lock, flags);
2006 /* if no change, wait aborted for some reason */
2007 if (newsigs.dsr_up == oldsigs.dsr_up &&
2008 newsigs.dsr_down == oldsigs.dsr_down &&
2009 newsigs.dcd_up == oldsigs.dcd_up &&
2010 newsigs.dcd_down == oldsigs.dcd_down &&
2011 newsigs.cts_up == oldsigs.cts_up &&
2012 newsigs.cts_down == oldsigs.cts_down &&
2013 newsigs.ri_up == oldsigs.ri_up &&
2014 newsigs.ri_down == oldsigs.ri_down &&
2015 cnow.exithunt == cprev.exithunt &&
2016 cnow.rxidle == cprev.rxidle) {
2022 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2023 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2024 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2025 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2026 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2027 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2028 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2029 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2030 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2031 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2039 remove_wait_queue(&info->event_wait_q, &wait);
2040 set_current_state(TASK_RUNNING);
2042 if (mask & MgslEvent_ExitHuntMode) {
2043 spin_lock_irqsave(&info->lock, flags);
2044 if (!waitqueue_active(&info->event_wait_q))
2045 irq_disable(info, CHA, IRQ_EXITHUNT);
2046 spin_unlock_irqrestore(&info->lock, flags);
2050 PUT_USER(rc, events, mask_ptr);
2054 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2056 unsigned long flags;
2058 struct mgsl_icount cprev, cnow;
2059 DECLARE_WAITQUEUE(wait, current);
2061 /* save current irq counts */
2062 spin_lock_irqsave(&info->lock, flags);
2063 cprev = info->icount;
2064 add_wait_queue(&info->status_event_wait_q, &wait);
2065 set_current_state(TASK_INTERRUPTIBLE);
2066 spin_unlock_irqrestore(&info->lock, flags);
2070 if (signal_pending(current)) {
2075 /* get new irq counts */
2076 spin_lock_irqsave(&info->lock, flags);
2077 cnow = info->icount;
2078 set_current_state(TASK_INTERRUPTIBLE);
2079 spin_unlock_irqrestore(&info->lock, flags);
2081 /* if no change, wait aborted for some reason */
2082 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2083 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2088 /* check for change in caller specified modem input */
2089 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2090 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2091 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2092 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2099 remove_wait_queue(&info->status_event_wait_q, &wait);
2100 set_current_state(TASK_RUNNING);
2104 /* return the state of the serial control and status signals
2106 static int tiocmget(struct tty_struct *tty)
2108 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2109 unsigned int result;
2110 unsigned long flags;
2112 spin_lock_irqsave(&info->lock, flags);
2114 spin_unlock_irqrestore(&info->lock, flags);
2116 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2117 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2118 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2119 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2120 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2121 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2123 if (debug_level >= DEBUG_LEVEL_INFO)
2124 printk("%s(%d):%s tiocmget() value=%08X\n",
2125 __FILE__, __LINE__, info->device_name, result);
2129 /* set modem control signals (DTR/RTS)
2131 static int tiocmset(struct tty_struct *tty,
2132 unsigned int set, unsigned int clear)
2134 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2135 unsigned long flags;
2137 if (debug_level >= DEBUG_LEVEL_INFO)
2138 printk("%s(%d):%s tiocmset(%x,%x)\n",
2139 __FILE__, __LINE__, info->device_name, set, clear);
2141 if (set & TIOCM_RTS)
2142 info->serial_signals |= SerialSignal_RTS;
2143 if (set & TIOCM_DTR)
2144 info->serial_signals |= SerialSignal_DTR;
2145 if (clear & TIOCM_RTS)
2146 info->serial_signals &= ~SerialSignal_RTS;
2147 if (clear & TIOCM_DTR)
2148 info->serial_signals &= ~SerialSignal_DTR;
2150 spin_lock_irqsave(&info->lock, flags);
2152 spin_unlock_irqrestore(&info->lock, flags);
2157 /* Set or clear transmit break condition
2159 * Arguments: tty pointer to tty instance data
2160 * break_state -1=set break condition, 0=clear
2162 static int mgslpc_break(struct tty_struct *tty, int break_state)
2164 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2165 unsigned long flags;
2167 if (debug_level >= DEBUG_LEVEL_INFO)
2168 printk("%s(%d):mgslpc_break(%s,%d)\n",
2169 __FILE__, __LINE__, info->device_name, break_state);
2171 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2174 spin_lock_irqsave(&info->lock, flags);
2175 if (break_state == -1)
2176 set_reg_bits(info, CHA+DAFO, BIT6);
2178 clear_reg_bits(info, CHA+DAFO, BIT6);
2179 spin_unlock_irqrestore(&info->lock, flags);
2183 static int mgslpc_get_icount(struct tty_struct *tty,
2184 struct serial_icounter_struct *icount)
2186 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2187 struct mgsl_icount cnow; /* kernel counter temps */
2188 unsigned long flags;
2190 spin_lock_irqsave(&info->lock, flags);
2191 cnow = info->icount;
2192 spin_unlock_irqrestore(&info->lock, flags);
2194 icount->cts = cnow.cts;
2195 icount->dsr = cnow.dsr;
2196 icount->rng = cnow.rng;
2197 icount->dcd = cnow.dcd;
2198 icount->rx = cnow.rx;
2199 icount->tx = cnow.tx;
2200 icount->frame = cnow.frame;
2201 icount->overrun = cnow.overrun;
2202 icount->parity = cnow.parity;
2203 icount->brk = cnow.brk;
2204 icount->buf_overrun = cnow.buf_overrun;
2209 /* Service an IOCTL request
2213 * tty pointer to tty instance data
2214 * cmd IOCTL command code
2215 * arg command argument/context
2217 * Return Value: 0 if success, otherwise error code
2219 static int mgslpc_ioctl(struct tty_struct *tty,
2220 unsigned int cmd, unsigned long arg)
2222 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2223 void __user *argp = (void __user *)arg;
2225 if (debug_level >= DEBUG_LEVEL_INFO)
2226 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2227 info->device_name, cmd);
2229 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2232 if (cmd != TIOCMIWAIT) {
2233 if (tty_io_error(tty))
2238 case MGSL_IOCGPARAMS:
2239 return get_params(info, argp);
2240 case MGSL_IOCSPARAMS:
2241 return set_params(info, argp, tty);
2242 case MGSL_IOCGTXIDLE:
2243 return get_txidle(info, argp);
2244 case MGSL_IOCSTXIDLE:
2245 return set_txidle(info, (int)arg);
2247 return get_interface(info, argp);
2249 return set_interface(info,(int)arg);
2250 case MGSL_IOCTXENABLE:
2251 return set_txenable(info,(int)arg, tty);
2252 case MGSL_IOCRXENABLE:
2253 return set_rxenable(info,(int)arg);
2254 case MGSL_IOCTXABORT:
2255 return tx_abort(info);
2256 case MGSL_IOCGSTATS:
2257 return get_stats(info, argp);
2258 case MGSL_IOCWAITEVENT:
2259 return wait_events(info, argp);
2261 return modem_input_wait(info,(int)arg);
2263 return -ENOIOCTLCMD;
2268 /* Set new termios settings
2272 * tty pointer to tty structure
2273 * termios pointer to buffer to hold returned old termios
2275 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2277 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2278 unsigned long flags;
2280 if (debug_level >= DEBUG_LEVEL_INFO)
2281 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2284 /* just return if nothing has changed */
2285 if ((tty->termios.c_cflag == old_termios->c_cflag)
2286 && (RELEVANT_IFLAG(tty->termios.c_iflag)
2287 == RELEVANT_IFLAG(old_termios->c_iflag)))
2290 mgslpc_change_params(info, tty);
2292 /* Handle transition to B0 status */
2293 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
2294 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2295 spin_lock_irqsave(&info->lock, flags);
2297 spin_unlock_irqrestore(&info->lock, flags);
2300 /* Handle transition away from B0 status */
2301 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
2302 info->serial_signals |= SerialSignal_DTR;
2303 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
2304 info->serial_signals |= SerialSignal_RTS;
2305 spin_lock_irqsave(&info->lock, flags);
2307 spin_unlock_irqrestore(&info->lock, flags);
2310 /* Handle turning off CRTSCTS */
2311 if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
2312 tty->hw_stopped = 0;
2317 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2319 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2320 struct tty_port *port = &info->port;
2322 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2325 if (debug_level >= DEBUG_LEVEL_INFO)
2326 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2327 __FILE__, __LINE__, info->device_name, port->count);
2329 if (tty_port_close_start(port, tty, filp) == 0)
2332 if (tty_port_initialized(port))
2333 mgslpc_wait_until_sent(tty, info->timeout);
2335 mgslpc_flush_buffer(tty);
2337 tty_ldisc_flush(tty);
2338 shutdown(info, tty);
2340 tty_port_close_end(port, tty);
2341 tty_port_tty_set(port, NULL);
2343 if (debug_level >= DEBUG_LEVEL_INFO)
2344 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2345 tty->driver->name, port->count);
2348 /* Wait until the transmitter is empty.
2350 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2352 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2353 unsigned long orig_jiffies, char_time;
2358 if (debug_level >= DEBUG_LEVEL_INFO)
2359 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2360 __FILE__, __LINE__, info->device_name);
2362 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2365 if (!tty_port_initialized(&info->port))
2368 orig_jiffies = jiffies;
2370 /* Set check interval to 1/5 of estimated time to
2371 * send a character, and make it at least 1. The check
2372 * interval should also be less than the timeout.
2373 * Note: use tight timings here to satisfy the NIST-PCTS.
2376 if (info->params.data_rate) {
2377 char_time = info->timeout/(32 * 5);
2384 char_time = min_t(unsigned long, char_time, timeout);
2386 if (info->params.mode == MGSL_MODE_HDLC) {
2387 while (info->tx_active) {
2388 msleep_interruptible(jiffies_to_msecs(char_time));
2389 if (signal_pending(current))
2391 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2395 while ((info->tx_count || info->tx_active) &&
2397 msleep_interruptible(jiffies_to_msecs(char_time));
2398 if (signal_pending(current))
2400 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2406 if (debug_level >= DEBUG_LEVEL_INFO)
2407 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2408 __FILE__, __LINE__, info->device_name);
2411 /* Called by tty_hangup() when a hangup is signaled.
2412 * This is the same as closing all open files for the port.
2414 static void mgslpc_hangup(struct tty_struct *tty)
2416 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2418 if (debug_level >= DEBUG_LEVEL_INFO)
2419 printk("%s(%d):mgslpc_hangup(%s)\n",
2420 __FILE__, __LINE__, info->device_name);
2422 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2425 mgslpc_flush_buffer(tty);
2426 shutdown(info, tty);
2427 tty_port_hangup(&info->port);
2430 static int carrier_raised(struct tty_port *port)
2432 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2433 unsigned long flags;
2435 spin_lock_irqsave(&info->lock, flags);
2437 spin_unlock_irqrestore(&info->lock, flags);
2439 if (info->serial_signals & SerialSignal_DCD)
2444 static void dtr_rts(struct tty_port *port, int onoff)
2446 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2447 unsigned long flags;
2449 spin_lock_irqsave(&info->lock, flags);
2451 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2453 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2455 spin_unlock_irqrestore(&info->lock, flags);
2459 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2462 struct tty_port *port;
2464 unsigned long flags;
2466 /* verify range of specified line number */
2468 if (line >= mgslpc_device_count) {
2469 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2470 __FILE__, __LINE__, line);
2474 /* find the info structure for the specified line */
2475 info = mgslpc_device_list;
2476 while(info && info->line != line)
2477 info = info->next_device;
2478 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2482 tty->driver_data = info;
2483 tty_port_tty_set(port, tty);
2485 if (debug_level >= DEBUG_LEVEL_INFO)
2486 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2487 __FILE__, __LINE__, tty->driver->name, port->count);
2489 spin_lock_irqsave(&info->netlock, flags);
2490 if (info->netcount) {
2492 spin_unlock_irqrestore(&info->netlock, flags);
2495 spin_lock(&port->lock);
2497 spin_unlock(&port->lock);
2498 spin_unlock_irqrestore(&info->netlock, flags);
2500 if (port->count == 1) {
2501 /* 1st open on this device, init hardware */
2502 retval = startup(info, tty);
2507 retval = tty_port_block_til_ready(&info->port, tty, filp);
2509 if (debug_level >= DEBUG_LEVEL_INFO)
2510 printk("%s(%d):block_til_ready(%s) returned %d\n",
2511 __FILE__, __LINE__, info->device_name, retval);
2515 if (debug_level >= DEBUG_LEVEL_INFO)
2516 printk("%s(%d):mgslpc_open(%s) success\n",
2517 __FILE__, __LINE__, info->device_name);
2525 * /proc fs routines....
2528 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2531 unsigned long flags;
2533 seq_printf(m, "%s:io:%04X irq:%d",
2534 info->device_name, info->io_base, info->irq_level);
2536 /* output current serial signal states */
2537 spin_lock_irqsave(&info->lock, flags);
2539 spin_unlock_irqrestore(&info->lock, flags);
2543 if (info->serial_signals & SerialSignal_RTS)
2544 strcat(stat_buf, "|RTS");
2545 if (info->serial_signals & SerialSignal_CTS)
2546 strcat(stat_buf, "|CTS");
2547 if (info->serial_signals & SerialSignal_DTR)
2548 strcat(stat_buf, "|DTR");
2549 if (info->serial_signals & SerialSignal_DSR)
2550 strcat(stat_buf, "|DSR");
2551 if (info->serial_signals & SerialSignal_DCD)
2552 strcat(stat_buf, "|CD");
2553 if (info->serial_signals & SerialSignal_RI)
2554 strcat(stat_buf, "|RI");
2556 if (info->params.mode == MGSL_MODE_HDLC) {
2557 seq_printf(m, " HDLC txok:%d rxok:%d",
2558 info->icount.txok, info->icount.rxok);
2559 if (info->icount.txunder)
2560 seq_printf(m, " txunder:%d", info->icount.txunder);
2561 if (info->icount.txabort)
2562 seq_printf(m, " txabort:%d", info->icount.txabort);
2563 if (info->icount.rxshort)
2564 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2565 if (info->icount.rxlong)
2566 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2567 if (info->icount.rxover)
2568 seq_printf(m, " rxover:%d", info->icount.rxover);
2569 if (info->icount.rxcrc)
2570 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2572 seq_printf(m, " ASYNC tx:%d rx:%d",
2573 info->icount.tx, info->icount.rx);
2574 if (info->icount.frame)
2575 seq_printf(m, " fe:%d", info->icount.frame);
2576 if (info->icount.parity)
2577 seq_printf(m, " pe:%d", info->icount.parity);
2578 if (info->icount.brk)
2579 seq_printf(m, " brk:%d", info->icount.brk);
2580 if (info->icount.overrun)
2581 seq_printf(m, " oe:%d", info->icount.overrun);
2584 /* Append serial signal status to end */
2585 seq_printf(m, " %s\n", stat_buf+1);
2587 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2588 info->tx_active,info->bh_requested,info->bh_running,
2592 /* Called to print information about devices
2594 static int mgslpc_proc_show(struct seq_file *m, void *v)
2598 seq_printf(m, "synclink driver:%s\n", driver_version);
2600 info = mgslpc_device_list;
2603 info = info->next_device;
2608 static int rx_alloc_buffers(MGSLPC_INFO *info)
2610 /* each buffer has header and data */
2611 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2613 /* calculate total allocation size for 8 buffers */
2614 info->rx_buf_total_size = info->rx_buf_size * 8;
2616 /* limit total allocated memory */
2617 if (info->rx_buf_total_size > 0x10000)
2618 info->rx_buf_total_size = 0x10000;
2620 /* calculate number of buffers */
2621 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2623 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2624 if (info->rx_buf == NULL)
2627 /* unused flag buffer to satisfy receive_buf calling interface */
2628 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2629 if (!info->flag_buf) {
2630 kfree(info->rx_buf);
2631 info->rx_buf = NULL;
2635 rx_reset_buffers(info);
2639 static void rx_free_buffers(MGSLPC_INFO *info)
2641 kfree(info->rx_buf);
2642 info->rx_buf = NULL;
2643 kfree(info->flag_buf);
2644 info->flag_buf = NULL;
2647 static int claim_resources(MGSLPC_INFO *info)
2649 if (rx_alloc_buffers(info) < 0) {
2650 printk("Can't allocate rx buffer %s\n", info->device_name);
2651 release_resources(info);
2657 static void release_resources(MGSLPC_INFO *info)
2659 if (debug_level >= DEBUG_LEVEL_INFO)
2660 printk("release_resources(%s)\n", info->device_name);
2661 rx_free_buffers(info);
2664 /* Add the specified device instance data structure to the
2665 * global linked list of devices and increment the device count.
2667 * Arguments: info pointer to device instance data
2669 static int mgslpc_add_device(MGSLPC_INFO *info)
2671 MGSLPC_INFO *current_dev = NULL;
2672 struct device *tty_dev;
2675 info->next_device = NULL;
2676 info->line = mgslpc_device_count;
2677 sprintf(info->device_name,"ttySLP%d",info->line);
2679 if (info->line < MAX_DEVICE_COUNT) {
2680 if (maxframe[info->line])
2681 info->max_frame_size = maxframe[info->line];
2684 mgslpc_device_count++;
2686 if (!mgslpc_device_list)
2687 mgslpc_device_list = info;
2689 current_dev = mgslpc_device_list;
2690 while (current_dev->next_device)
2691 current_dev = current_dev->next_device;
2692 current_dev->next_device = info;
2695 if (info->max_frame_size < 4096)
2696 info->max_frame_size = 4096;
2697 else if (info->max_frame_size > 65535)
2698 info->max_frame_size = 65535;
2700 printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2701 info->device_name, info->io_base, info->irq_level);
2703 #if SYNCLINK_GENERIC_HDLC
2704 ret = hdlcdev_init(info);
2709 tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2711 if (IS_ERR(tty_dev)) {
2712 ret = PTR_ERR(tty_dev);
2713 #if SYNCLINK_GENERIC_HDLC
2723 current_dev->next_device = NULL;
2725 mgslpc_device_list = NULL;
2726 mgslpc_device_count--;
2730 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2732 MGSLPC_INFO *info = mgslpc_device_list;
2733 MGSLPC_INFO *last = NULL;
2736 if (info == remove_info) {
2738 last->next_device = info->next_device;
2740 mgslpc_device_list = info->next_device;
2741 tty_unregister_device(serial_driver, info->line);
2742 #if SYNCLINK_GENERIC_HDLC
2745 release_resources(info);
2746 tty_port_destroy(&info->port);
2748 mgslpc_device_count--;
2752 info = info->next_device;
2756 static const struct pcmcia_device_id mgslpc_ids[] = {
2757 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2760 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2762 static struct pcmcia_driver mgslpc_driver = {
2763 .owner = THIS_MODULE,
2764 .name = "synclink_cs",
2765 .probe = mgslpc_probe,
2766 .remove = mgslpc_detach,
2767 .id_table = mgslpc_ids,
2768 .suspend = mgslpc_suspend,
2769 .resume = mgslpc_resume,
2772 static const struct tty_operations mgslpc_ops = {
2773 .open = mgslpc_open,
2774 .close = mgslpc_close,
2775 .write = mgslpc_write,
2776 .put_char = mgslpc_put_char,
2777 .flush_chars = mgslpc_flush_chars,
2778 .write_room = mgslpc_write_room,
2779 .chars_in_buffer = mgslpc_chars_in_buffer,
2780 .flush_buffer = mgslpc_flush_buffer,
2781 .ioctl = mgslpc_ioctl,
2782 .throttle = mgslpc_throttle,
2783 .unthrottle = mgslpc_unthrottle,
2784 .send_xchar = mgslpc_send_xchar,
2785 .break_ctl = mgslpc_break,
2786 .wait_until_sent = mgslpc_wait_until_sent,
2787 .set_termios = mgslpc_set_termios,
2789 .start = tx_release,
2790 .hangup = mgslpc_hangup,
2791 .tiocmget = tiocmget,
2792 .tiocmset = tiocmset,
2793 .get_icount = mgslpc_get_icount,
2794 .proc_show = mgslpc_proc_show,
2797 static int __init synclink_cs_init(void)
2801 if (break_on_load) {
2802 mgslpc_get_text_ptr();
2806 serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2807 TTY_DRIVER_REAL_RAW |
2808 TTY_DRIVER_DYNAMIC_DEV);
2809 if (IS_ERR(serial_driver)) {
2810 rc = PTR_ERR(serial_driver);
2814 /* Initialize the tty_driver structure */
2815 serial_driver->driver_name = "synclink_cs";
2816 serial_driver->name = "ttySLP";
2817 serial_driver->major = ttymajor;
2818 serial_driver->minor_start = 64;
2819 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2820 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2821 serial_driver->init_termios = tty_std_termios;
2822 serial_driver->init_termios.c_cflag =
2823 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2824 tty_set_operations(serial_driver, &mgslpc_ops);
2826 rc = tty_register_driver(serial_driver);
2828 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2829 __FILE__, __LINE__);
2833 rc = pcmcia_register_driver(&mgslpc_driver);
2837 printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2838 serial_driver->major);
2842 tty_unregister_driver(serial_driver);
2844 tty_driver_kref_put(serial_driver);
2849 static void __exit synclink_cs_exit(void)
2851 pcmcia_unregister_driver(&mgslpc_driver);
2852 tty_unregister_driver(serial_driver);
2853 tty_driver_kref_put(serial_driver);
2856 module_init(synclink_cs_init);
2857 module_exit(synclink_cs_exit);
2859 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2864 /* note:standard BRG mode is broken in V3.2 chip
2865 * so enhanced mode is always used
2873 for (M = 1; N > 64 && M < 16; M++)
2879 * BGR[7..0] contained in BGR register
2880 * BGR[9..8] contained in CCR2[7..6]
2881 * divisor = (N+1)*2^M
2883 * Note: M *must* not be zero (causes asymetric duty cycle)
2885 write_reg(info, (unsigned char) (channel + BGR),
2886 (unsigned char) ((M << 6) + N));
2887 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2888 val |= ((M << 4) & 0xc0);
2889 write_reg(info, (unsigned char) (channel + CCR2), val);
2893 /* Enabled the AUX clock output at the specified frequency.
2895 static void enable_auxclk(MGSLPC_INFO *info)
2901 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2902 * 05 ADM Address Mode, 0 = no addr recognition
2903 * 04 TMD Timer Mode, 0 = external
2904 * 03 RAC Receiver Active, 0 = inactive
2905 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2906 * 01 TRS Timer Resolution, 1=512
2907 * 00 TLP Test Loop, 0 = no loop
2913 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2914 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2916 write_reg(info, CHB + MODE, val);
2920 * 07 PU Power Up, 1=active, 0=power down
2921 * 06 MCE Master Clock Enable, 1=enabled
2923 * 04..02 SC[2..0] Encoding
2924 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2928 write_reg(info, CHB + CCR0, 0xc0);
2932 * 07 SFLG Shared Flag, 0 = disable shared flags
2933 * 06 GALP Go Active On Loop, 0 = not used
2934 * 05 GLP Go On Loop, 0 = not used
2935 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2936 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2937 * 02..00 CM[2..0] Clock Mode
2941 write_reg(info, CHB + CCR1, 0x17);
2945 * 07..06 BGR[9..8] Baud rate bits 9..8
2946 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2947 * 04 SSEL Clock source select, 1=submode b
2948 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2949 * 02 RWX Read/Write Exchange 0=disabled
2950 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2951 * 00 DIV, data inversion 0=disabled, 1=enabled
2955 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2956 write_reg(info, CHB + CCR2, 0x38);
2958 write_reg(info, CHB + CCR2, 0x30);
2962 * 07 MCK4 Master Clock Divide by 4, 1=enabled
2963 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2964 * 05 TST1 Test Pin, 0=normal operation
2965 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
2966 * 03..02 Reserved, must be 0
2967 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
2971 write_reg(info, CHB + CCR4, 0x50);
2973 /* if auxclk not enabled, set internal BRG so
2974 * CTS transitions can be detected (requires TxC)
2976 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2977 mgslpc_set_rate(info, CHB, info->params.clock_speed);
2979 mgslpc_set_rate(info, CHB, 921600);
2982 static void loopback_enable(MGSLPC_INFO *info)
2986 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
2987 val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0);
2988 write_reg(info, CHA + CCR1, val);
2990 /* CCR2:04 SSEL Clock source select, 1=submode b */
2991 val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5);
2992 write_reg(info, CHA + CCR2, val);
2994 /* set LinkSpeed if available, otherwise default to 2Mbps */
2995 if (info->params.clock_speed)
2996 mgslpc_set_rate(info, CHA, info->params.clock_speed);
2998 mgslpc_set_rate(info, CHA, 1843200);
3000 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3001 val = read_reg(info, CHA + MODE) | BIT0;
3002 write_reg(info, CHA + MODE, val);
3005 static void hdlc_mode(MGSLPC_INFO *info)
3008 unsigned char clkmode, clksubmode;
3010 /* disable all interrupts */
3011 irq_disable(info, CHA, 0xffff);
3012 irq_disable(info, CHB, 0xffff);
3013 port_irq_disable(info, 0xff);
3015 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3016 clkmode = clksubmode = 0;
3017 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3018 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3019 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3021 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3022 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3023 /* clock mode 7b, rcv = BRG, xmt = BRG */
3026 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3027 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3028 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3032 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3035 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3036 /* clock mode 0b, rcv = RxC, xmt = BRG */
3042 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3043 * 05 ADM Address Mode, 0 = no addr recognition
3044 * 04 TMD Timer Mode, 0 = external
3045 * 03 RAC Receiver Active, 0 = inactive
3046 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3047 * 01 TRS Timer Resolution, 1=512
3048 * 00 TLP Test Loop, 0 = no loop
3053 if (info->params.loopback)
3056 /* preserve RTS state */
3057 if (info->serial_signals & SerialSignal_RTS)
3059 write_reg(info, CHA + MODE, val);
3063 * 07 PU Power Up, 1=active, 0=power down
3064 * 06 MCE Master Clock Enable, 1=enabled
3066 * 04..02 SC[2..0] Encoding
3067 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3072 switch (info->params.encoding)
3074 case HDLC_ENCODING_NRZI:
3077 case HDLC_ENCODING_BIPHASE_SPACE:
3080 case HDLC_ENCODING_BIPHASE_MARK:
3083 case HDLC_ENCODING_BIPHASE_LEVEL:
3085 break; // Manchester
3087 write_reg(info, CHA + CCR0, val);
3091 * 07 SFLG Shared Flag, 0 = disable shared flags
3092 * 06 GALP Go Active On Loop, 0 = not used
3093 * 05 GLP Go On Loop, 0 = not used
3094 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3095 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3096 * 02..00 CM[2..0] Clock Mode
3100 val = 0x10 + clkmode;
3101 write_reg(info, CHA + CCR1, val);
3105 * 07..06 BGR[9..8] Baud rate bits 9..8
3106 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3107 * 04 SSEL Clock source select, 1=submode b
3108 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3109 * 02 RWX Read/Write Exchange 0=disabled
3110 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3111 * 00 DIV, data inversion 0=disabled, 1=enabled
3116 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3117 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3121 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3123 if (info->params.encoding == HDLC_ENCODING_NRZB)
3125 write_reg(info, CHA + CCR2, val);
3129 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3130 * 05 EPT Enable preamble transmission, 1=enabled
3131 * 04 RADD Receive address pushed to FIFO, 0=disabled
3132 * 03 CRL CRC Reset Level, 0=FFFF
3133 * 02 RCRC Rx CRC 0=On 1=Off
3134 * 01 TCRC Tx CRC 0=On 1=Off
3135 * 00 PSD DPLL Phase Shift Disable
3140 if (info->params.crc_type == HDLC_CRC_NONE)
3142 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3144 switch (info->params.preamble_length)
3146 case HDLC_PREAMBLE_LENGTH_16BITS:
3149 case HDLC_PREAMBLE_LENGTH_32BITS:
3152 case HDLC_PREAMBLE_LENGTH_64BITS:
3156 write_reg(info, CHA + CCR3, val);
3158 /* PRE - Preamble pattern */
3160 switch (info->params.preamble)
3162 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3163 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3164 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3165 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3167 write_reg(info, CHA + PRE, val);
3171 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3172 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3173 * 05 TST1 Test Pin, 0=normal operation
3174 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3175 * 03..02 Reserved, must be 0
3176 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3181 write_reg(info, CHA + CCR4, val);
3182 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3183 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3185 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3187 /* RLCR Receive length check register
3189 * 7 1=enable receive length check
3190 * 6..0 Max frame length = (RL + 1) * 32
3192 write_reg(info, CHA + RLCR, 0);
3194 /* XBCH Transmit Byte Count High
3196 * 07 DMA mode, 0 = interrupt driven
3197 * 06 NRM, 0=ABM (ignored)
3198 * 05 CAS Carrier Auto Start
3199 * 04 XC Transmit Continuously (ignored)
3200 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3205 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3207 write_reg(info, CHA + XBCH, val);
3208 enable_auxclk(info);
3209 if (info->params.loopback || info->testing_irq)
3210 loopback_enable(info);
3211 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3213 irq_enable(info, CHB, IRQ_CTS);
3214 /* PVR[3] 1=AUTO CTS active */
3215 set_reg_bits(info, CHA + PVR, BIT3);
3217 clear_reg_bits(info, CHA + PVR, BIT3);
3219 irq_enable(info, CHA,
3220 IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT |
3221 IRQ_UNDERRUN | IRQ_TXFIFO);
3222 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3223 wait_command_complete(info, CHA);
3224 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3226 /* Master clock mode enabled above to allow reset commands
3227 * to complete even if no data clocks are present.
3229 * Disable master clock mode for normal communications because
3230 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3231 * IRQ when in master clock mode.
3233 * Leave master clock mode enabled for IRQ test because the
3234 * timer IRQ used by the test can only happen in master clock mode.
3236 if (!info->testing_irq)
3237 clear_reg_bits(info, CHA + CCR0, BIT6);
3245 static void rx_stop(MGSLPC_INFO *info)
3247 if (debug_level >= DEBUG_LEVEL_ISR)
3248 printk("%s(%d):rx_stop(%s)\n",
3249 __FILE__, __LINE__, info->device_name);
3251 /* MODE:03 RAC Receiver Active, 0=inactive */
3252 clear_reg_bits(info, CHA + MODE, BIT3);
3254 info->rx_enabled = false;
3255 info->rx_overflow = false;
3258 static void rx_start(MGSLPC_INFO *info)
3260 if (debug_level >= DEBUG_LEVEL_ISR)
3261 printk("%s(%d):rx_start(%s)\n",
3262 __FILE__, __LINE__, info->device_name);
3264 rx_reset_buffers(info);
3265 info->rx_enabled = false;
3266 info->rx_overflow = false;
3268 /* MODE:03 RAC Receiver Active, 1=active */
3269 set_reg_bits(info, CHA + MODE, BIT3);
3271 info->rx_enabled = true;
3274 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3276 if (debug_level >= DEBUG_LEVEL_ISR)
3277 printk("%s(%d):tx_start(%s)\n",
3278 __FILE__, __LINE__, info->device_name);
3280 if (info->tx_count) {
3281 /* If auto RTS enabled and RTS is inactive, then assert */
3282 /* RTS and set a flag indicating that the driver should */
3283 /* negate RTS when the transmission completes. */
3284 info->drop_rts_on_tx_done = false;
3286 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3288 if (!(info->serial_signals & SerialSignal_RTS)) {
3289 info->serial_signals |= SerialSignal_RTS;
3291 info->drop_rts_on_tx_done = true;
3295 if (info->params.mode == MGSL_MODE_ASYNC) {
3296 if (!info->tx_active) {
3297 info->tx_active = true;
3298 tx_ready(info, tty);
3301 info->tx_active = true;
3302 tx_ready(info, tty);
3303 mod_timer(&info->tx_timer, jiffies +
3304 msecs_to_jiffies(5000));
3308 if (!info->tx_enabled)
3309 info->tx_enabled = true;
3312 static void tx_stop(MGSLPC_INFO *info)
3314 if (debug_level >= DEBUG_LEVEL_ISR)
3315 printk("%s(%d):tx_stop(%s)\n",
3316 __FILE__, __LINE__, info->device_name);
3318 del_timer(&info->tx_timer);
3320 info->tx_enabled = false;
3321 info->tx_active = false;
3324 /* Reset the adapter to a known state and prepare it for further use.
3326 static void reset_device(MGSLPC_INFO *info)
3328 /* power up both channels (set BIT7) */
3329 write_reg(info, CHA + CCR0, 0x80);
3330 write_reg(info, CHB + CCR0, 0x80);
3331 write_reg(info, CHA + MODE, 0);
3332 write_reg(info, CHB + MODE, 0);
3334 /* disable all interrupts */
3335 irq_disable(info, CHA, 0xffff);
3336 irq_disable(info, CHB, 0xffff);
3337 port_irq_disable(info, 0xff);
3339 /* PCR Port Configuration Register
3341 * 07..04 DEC[3..0] Serial I/F select outputs
3342 * 03 output, 1=AUTO CTS control enabled
3343 * 02 RI Ring Indicator input 0=active
3344 * 01 DSR input 0=active
3345 * 00 DTR output 0=active
3349 write_reg(info, PCR, 0x06);
3351 /* PVR Port Value Register
3353 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3354 * 03 AUTO CTS output 1=enabled
3355 * 02 RI Ring Indicator input
3357 * 00 DTR output (1=inactive)
3361 // write_reg(info, PVR, PVR_DTR);
3363 /* IPC Interrupt Port Configuration
3365 * 07 VIS 1=Masked interrupts visible
3366 * 06..05 Reserved, 0
3367 * 04..03 SLA Slave address, 00 ignored
3368 * 02 CASM Cascading Mode, 1=daisy chain
3369 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3373 write_reg(info, IPC, 0x05);
3376 static void async_mode(MGSLPC_INFO *info)
3380 /* disable all interrupts */
3381 irq_disable(info, CHA, 0xffff);
3382 irq_disable(info, CHB, 0xffff);
3383 port_irq_disable(info, 0xff);
3388 * 06 FRTS RTS State, 0=active
3389 * 05 FCTS Flow Control on CTS
3390 * 04 FLON Flow Control Enable
3391 * 03 RAC Receiver Active, 0 = inactive
3392 * 02 RTS 0=Auto RTS, 1=manual RTS
3393 * 01 TRS Timer Resolution, 1=512
3394 * 00 TLP Test Loop, 0 = no loop
3399 if (info->params.loopback)
3402 /* preserve RTS state */
3403 if (!(info->serial_signals & SerialSignal_RTS))
3405 write_reg(info, CHA + MODE, val);
3409 * 07 PU Power Up, 1=active, 0=power down
3410 * 06 MCE Master Clock Enable, 1=enabled
3412 * 04..02 SC[2..0] Encoding, 000=NRZ
3413 * 01..00 SM[1..0] Serial Mode, 11=Async
3417 write_reg(info, CHA + CCR0, 0x83);
3421 * 07..05 Reserved, 0
3422 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3423 * 03 BCR Bit Clock Rate, 1=16x
3424 * 02..00 CM[2..0] Clock Mode, 111=BRG
3428 write_reg(info, CHA + CCR1, 0x1f);
3432 * 07..06 BGR[9..8] Baud rate bits 9..8
3433 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3434 * 04 SSEL Clock source select, 1=submode b
3435 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3436 * 02 RWX Read/Write Exchange 0=disabled
3438 * 00 DIV, data inversion 0=disabled, 1=enabled
3442 write_reg(info, CHA + CCR2, 0x10);
3446 * 07..01 Reserved, 0
3447 * 00 PSD DPLL Phase Shift Disable
3451 write_reg(info, CHA + CCR3, 0);
3455 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3456 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3457 * 05 TST1 Test Pin, 0=normal operation
3458 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3459 * 03..00 Reserved, must be 0
3463 write_reg(info, CHA + CCR4, 0x50);
3464 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3469 * 06 XBRK transmit break, 0=normal operation
3470 * 05 Stop bits (0=1, 1=2)
3471 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3472 * 02 PAREN Parity Enable
3473 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3477 if (info->params.data_bits != 8)
3478 val |= BIT0; /* 7 bits */
3479 if (info->params.stop_bits != 1)
3481 if (info->params.parity != ASYNC_PARITY_NONE)
3483 val |= BIT2; /* Parity enable */
3484 if (info->params.parity == ASYNC_PARITY_ODD)
3489 write_reg(info, CHA + DAFO, val);
3491 /* RFC Rx FIFO Control
3494 * 06 DPS, 1=parity bit not stored in data byte
3495 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3496 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3497 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3499 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3503 write_reg(info, CHA + RFC, 0x5c);
3505 /* RLCR Receive length check register
3507 * Max frame length = (RL + 1) * 32
3509 write_reg(info, CHA + RLCR, 0);
3511 /* XBCH Transmit Byte Count High
3513 * 07 DMA mode, 0 = interrupt driven
3514 * 06 NRM, 0=ABM (ignored)
3515 * 05 CAS Carrier Auto Start
3516 * 04 XC Transmit Continuously (ignored)
3517 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3522 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3524 write_reg(info, CHA + XBCH, val);
3525 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3526 irq_enable(info, CHA, IRQ_CTS);
3528 /* MODE:03 RAC Receiver Active, 1=active */
3529 set_reg_bits(info, CHA + MODE, BIT3);
3530 enable_auxclk(info);
3531 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3532 irq_enable(info, CHB, IRQ_CTS);
3533 /* PVR[3] 1=AUTO CTS active */
3534 set_reg_bits(info, CHA + PVR, BIT3);
3536 clear_reg_bits(info, CHA + PVR, BIT3);
3537 irq_enable(info, CHA,
3538 IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME |
3539 IRQ_ALLSENT | IRQ_TXFIFO);
3540 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3541 wait_command_complete(info, CHA);
3542 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3545 /* Set the HDLC idle mode for the transmitter.
3547 static void tx_set_idle(MGSLPC_INFO *info)
3549 /* Note: ESCC2 only supports flags and one idle modes */
3550 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3551 set_reg_bits(info, CHA + CCR1, BIT3);
3553 clear_reg_bits(info, CHA + CCR1, BIT3);
3556 /* get state of the V24 status (input) signals.
3558 static void get_signals(MGSLPC_INFO *info)
3560 unsigned char status = 0;
3562 /* preserve RTS and DTR */
3563 info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
3565 if (read_reg(info, CHB + VSTR) & BIT7)
3566 info->serial_signals |= SerialSignal_DCD;
3567 if (read_reg(info, CHB + STAR) & BIT1)
3568 info->serial_signals |= SerialSignal_CTS;
3570 status = read_reg(info, CHA + PVR);
3571 if (!(status & PVR_RI))
3572 info->serial_signals |= SerialSignal_RI;
3573 if (!(status & PVR_DSR))
3574 info->serial_signals |= SerialSignal_DSR;
3577 /* Set the state of RTS and DTR based on contents of
3578 * serial_signals member of device extension.
3580 static void set_signals(MGSLPC_INFO *info)
3584 val = read_reg(info, CHA + MODE);
3585 if (info->params.mode == MGSL_MODE_ASYNC) {
3586 if (info->serial_signals & SerialSignal_RTS)
3591 if (info->serial_signals & SerialSignal_RTS)
3596 write_reg(info, CHA + MODE, val);
3598 if (info->serial_signals & SerialSignal_DTR)
3599 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3601 set_reg_bits(info, CHA + PVR, PVR_DTR);
3604 static void rx_reset_buffers(MGSLPC_INFO *info)
3611 info->rx_frame_count = 0;
3612 for (i=0 ; i < info->rx_buf_count ; i++) {
3613 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3614 buf->status = buf->count = 0;
3618 /* Attempt to return a received HDLC frame
3619 * Only frames received without errors are returned.
3621 * Returns true if frame returned, otherwise false
3623 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3625 unsigned short status;
3627 unsigned int framesize = 0;
3628 unsigned long flags;
3629 bool return_frame = false;
3631 if (info->rx_frame_count == 0)
3634 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3636 status = buf->status;
3638 /* 07 VFR 1=valid frame
3639 * 06 RDO 1=data overrun
3640 * 05 CRC 1=OK, 0=error
3641 * 04 RAB 1=frame aborted
3643 if ((status & 0xf0) != 0xA0) {
3644 if (!(status & BIT7) || (status & BIT4))
3645 info->icount.rxabort++;
3646 else if (status & BIT6)
3647 info->icount.rxover++;
3648 else if (!(status & BIT5)) {
3649 info->icount.rxcrc++;
3650 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3651 return_frame = true;
3654 #if SYNCLINK_GENERIC_HDLC
3656 info->netdev->stats.rx_errors++;
3657 info->netdev->stats.rx_frame_errors++;
3661 return_frame = true;
3664 framesize = buf->count;
3666 if (debug_level >= DEBUG_LEVEL_BH)
3667 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3668 __FILE__, __LINE__, info->device_name, status, framesize);
3670 if (debug_level >= DEBUG_LEVEL_DATA)
3671 trace_block(info, buf->data, framesize, 0);
3674 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3675 framesize+1 > info->max_frame_size) ||
3676 framesize > info->max_frame_size)
3677 info->icount.rxlong++;
3680 info->icount.rxok++;
3682 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3683 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3687 #if SYNCLINK_GENERIC_HDLC
3689 hdlcdev_rx(info, buf->data, framesize);
3692 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3696 spin_lock_irqsave(&info->lock, flags);
3697 buf->status = buf->count = 0;
3698 info->rx_frame_count--;
3700 if (info->rx_get >= info->rx_buf_count)
3702 spin_unlock_irqrestore(&info->lock, flags);
3707 static bool register_test(MGSLPC_INFO *info)
3709 static unsigned char patterns[] =
3710 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3711 static unsigned int count = ARRAY_SIZE(patterns);
3714 unsigned long flags;
3716 spin_lock_irqsave(&info->lock, flags);
3719 for (i = 0; i < count; i++) {
3720 write_reg(info, XAD1, patterns[i]);
3721 write_reg(info, XAD2, patterns[(i + 1) % count]);
3722 if ((read_reg(info, XAD1) != patterns[i]) ||
3723 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3729 spin_unlock_irqrestore(&info->lock, flags);
3733 static bool irq_test(MGSLPC_INFO *info)
3735 unsigned long end_time;
3736 unsigned long flags;
3738 spin_lock_irqsave(&info->lock, flags);
3741 info->testing_irq = true;
3744 info->irq_occurred = false;
3746 /* init hdlc mode */
3748 irq_enable(info, CHA, IRQ_TIMER);
3749 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3750 issue_command(info, CHA, CMD_START_TIMER);
3752 spin_unlock_irqrestore(&info->lock, flags);
3755 while(end_time-- && !info->irq_occurred) {
3756 msleep_interruptible(10);
3759 info->testing_irq = false;
3761 spin_lock_irqsave(&info->lock, flags);
3763 spin_unlock_irqrestore(&info->lock, flags);
3765 return info->irq_occurred;
3768 static int adapter_test(MGSLPC_INFO *info)
3770 if (!register_test(info)) {
3771 info->init_error = DiagStatus_AddressFailure;
3772 printk("%s(%d):Register test failure for device %s Addr=%04X\n",
3773 __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base));
3777 if (!irq_test(info)) {
3778 info->init_error = DiagStatus_IrqFailure;
3779 printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3780 __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level));
3784 if (debug_level >= DEBUG_LEVEL_INFO)
3785 printk("%s(%d):device %s passed diagnostics\n",
3786 __FILE__, __LINE__, info->device_name);
3790 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3795 printk("%s tx data:\n", info->device_name);
3797 printk("%s rx data:\n", info->device_name);
3805 for(i=0;i<linecount;i++)
3806 printk("%02X ", (unsigned char)data[i]);
3809 for(i=0;i<linecount;i++) {
3810 if (data[i]>=040 && data[i]<=0176)
3811 printk("%c", data[i]);
3822 /* HDLC frame time out
3823 * update stats and do tx completion processing
3825 static void tx_timeout(struct timer_list *t)
3827 MGSLPC_INFO *info = from_timer(info, t, tx_timer);
3828 unsigned long flags;
3830 if (debug_level >= DEBUG_LEVEL_INFO)
3831 printk("%s(%d):tx_timeout(%s)\n",
3832 __FILE__, __LINE__, info->device_name);
3833 if (info->tx_active &&
3834 info->params.mode == MGSL_MODE_HDLC) {
3835 info->icount.txtimeout++;
3837 spin_lock_irqsave(&info->lock, flags);
3838 info->tx_active = false;
3839 info->tx_count = info->tx_put = info->tx_get = 0;
3841 spin_unlock_irqrestore(&info->lock, flags);
3843 #if SYNCLINK_GENERIC_HDLC
3845 hdlcdev_tx_done(info);
3849 struct tty_struct *tty = tty_port_tty_get(&info->port);
3850 bh_transmit(info, tty);
3855 #if SYNCLINK_GENERIC_HDLC
3858 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3859 * set encoding and frame check sequence (FCS) options
3861 * dev pointer to network device structure
3862 * encoding serial encoding setting
3863 * parity FCS setting
3865 * returns 0 if success, otherwise error code
3867 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3868 unsigned short parity)
3870 MGSLPC_INFO *info = dev_to_port(dev);
3871 struct tty_struct *tty;
3872 unsigned char new_encoding;
3873 unsigned short new_crctype;
3875 /* return error if TTY interface open */
3876 if (info->port.count)
3881 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3882 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3883 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3884 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3885 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3886 default: return -EINVAL;
3891 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3892 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3893 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3894 default: return -EINVAL;
3897 info->params.encoding = new_encoding;
3898 info->params.crc_type = new_crctype;
3900 /* if network interface up, reprogram hardware */
3901 if (info->netcount) {
3902 tty = tty_port_tty_get(&info->port);
3903 mgslpc_program_hw(info, tty);
3911 * called by generic HDLC layer to send frame
3913 * skb socket buffer containing HDLC frame
3914 * dev pointer to network device structure
3916 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3917 struct net_device *dev)
3919 MGSLPC_INFO *info = dev_to_port(dev);
3920 unsigned long flags;
3922 if (debug_level >= DEBUG_LEVEL_INFO)
3923 printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name);
3925 /* stop sending until this frame completes */
3926 netif_stop_queue(dev);
3928 /* copy data to device buffers */
3929 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3931 info->tx_put = info->tx_count = skb->len;
3933 /* update network statistics */
3934 dev->stats.tx_packets++;
3935 dev->stats.tx_bytes += skb->len;
3937 /* done with socket buffer, so free it */
3940 /* save start time for transmit timeout detection */
3941 netif_trans_update(dev);
3943 /* start hardware transmitter if necessary */
3944 spin_lock_irqsave(&info->lock, flags);
3945 if (!info->tx_active) {
3946 struct tty_struct *tty = tty_port_tty_get(&info->port);
3947 tx_start(info, tty);
3950 spin_unlock_irqrestore(&info->lock, flags);
3952 return NETDEV_TX_OK;
3956 * called by network layer when interface enabled
3957 * claim resources and initialize hardware
3959 * dev pointer to network device structure
3961 * returns 0 if success, otherwise error code
3963 static int hdlcdev_open(struct net_device *dev)
3965 MGSLPC_INFO *info = dev_to_port(dev);
3966 struct tty_struct *tty;
3968 unsigned long flags;
3970 if (debug_level >= DEBUG_LEVEL_INFO)
3971 printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name);
3973 /* generic HDLC layer open processing */
3974 rc = hdlc_open(dev);
3978 /* arbitrate between network and tty opens */
3979 spin_lock_irqsave(&info->netlock, flags);
3980 if (info->port.count != 0 || info->netcount != 0) {
3981 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
3982 spin_unlock_irqrestore(&info->netlock, flags);
3986 spin_unlock_irqrestore(&info->netlock, flags);
3988 tty = tty_port_tty_get(&info->port);
3989 /* claim resources and init adapter */
3990 rc = startup(info, tty);
3993 spin_lock_irqsave(&info->netlock, flags);
3995 spin_unlock_irqrestore(&info->netlock, flags);
3998 /* assert RTS and DTR, apply hardware settings */
3999 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
4000 mgslpc_program_hw(info, tty);
4003 /* enable network layer transmit */
4004 netif_trans_update(dev);
4005 netif_start_queue(dev);
4007 /* inform generic HDLC layer of current DCD status */
4008 spin_lock_irqsave(&info->lock, flags);
4010 spin_unlock_irqrestore(&info->lock, flags);
4011 if (info->serial_signals & SerialSignal_DCD)
4012 netif_carrier_on(dev);
4014 netif_carrier_off(dev);
4019 * called by network layer when interface is disabled
4020 * shutdown hardware and release resources
4022 * dev pointer to network device structure
4024 * returns 0 if success, otherwise error code
4026 static int hdlcdev_close(struct net_device *dev)
4028 MGSLPC_INFO *info = dev_to_port(dev);
4029 struct tty_struct *tty = tty_port_tty_get(&info->port);
4030 unsigned long flags;
4032 if (debug_level >= DEBUG_LEVEL_INFO)
4033 printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name);
4035 netif_stop_queue(dev);
4037 /* shutdown adapter and release resources */
4038 shutdown(info, tty);
4042 spin_lock_irqsave(&info->netlock, flags);
4044 spin_unlock_irqrestore(&info->netlock, flags);
4050 * called by network layer to process IOCTL call to network device
4052 * dev pointer to network device structure
4053 * ifr pointer to network interface request structure
4054 * cmd IOCTL command code
4056 * returns 0 if success, otherwise error code
4058 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4060 const size_t size = sizeof(sync_serial_settings);
4061 sync_serial_settings new_line;
4062 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4063 MGSLPC_INFO *info = dev_to_port(dev);
4066 if (debug_level >= DEBUG_LEVEL_INFO)
4067 printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name);
4069 /* return error if TTY interface open */
4070 if (info->port.count)
4073 if (cmd != SIOCWANDEV)
4074 return hdlc_ioctl(dev, ifr, cmd);
4076 memset(&new_line, 0, size);
4078 switch(ifr->ifr_settings.type) {
4079 case IF_GET_IFACE: /* return current sync_serial_settings */
4081 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4082 if (ifr->ifr_settings.size < size) {
4083 ifr->ifr_settings.size = size; /* data size wanted */
4087 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4088 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4089 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4090 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4093 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4094 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4095 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4096 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4097 default: new_line.clock_type = CLOCK_DEFAULT;
4100 new_line.clock_rate = info->params.clock_speed;
4101 new_line.loopback = info->params.loopback ? 1:0;
4103 if (copy_to_user(line, &new_line, size))
4107 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4109 if(!capable(CAP_NET_ADMIN))
4111 if (copy_from_user(&new_line, line, size))
4114 switch (new_line.clock_type)
4116 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4117 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4118 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4119 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4120 case CLOCK_DEFAULT: flags = info->params.flags &
4121 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4122 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4123 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4124 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4125 default: return -EINVAL;
4128 if (new_line.loopback != 0 && new_line.loopback != 1)
4131 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4132 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4133 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4134 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4135 info->params.flags |= flags;
4137 info->params.loopback = new_line.loopback;
4139 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4140 info->params.clock_speed = new_line.clock_rate;
4142 info->params.clock_speed = 0;
4144 /* if network interface up, reprogram hardware */
4145 if (info->netcount) {
4146 struct tty_struct *tty = tty_port_tty_get(&info->port);
4147 mgslpc_program_hw(info, tty);
4153 return hdlc_ioctl(dev, ifr, cmd);
4158 * called by network layer when transmit timeout is detected
4160 * dev pointer to network device structure
4162 static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
4164 MGSLPC_INFO *info = dev_to_port(dev);
4165 unsigned long flags;
4167 if (debug_level >= DEBUG_LEVEL_INFO)
4168 printk("hdlcdev_tx_timeout(%s)\n", dev->name);
4170 dev->stats.tx_errors++;
4171 dev->stats.tx_aborted_errors++;
4173 spin_lock_irqsave(&info->lock, flags);
4175 spin_unlock_irqrestore(&info->lock, flags);
4177 netif_wake_queue(dev);
4181 * called by device driver when transmit completes
4182 * reenable network layer transmit if stopped
4184 * info pointer to device instance information
4186 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4188 if (netif_queue_stopped(info->netdev))
4189 netif_wake_queue(info->netdev);
4193 * called by device driver when frame received
4194 * pass frame to network layer
4196 * info pointer to device instance information
4197 * buf pointer to buffer contianing frame data
4198 * size count of data bytes in buf
4200 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4202 struct sk_buff *skb = dev_alloc_skb(size);
4203 struct net_device *dev = info->netdev;
4205 if (debug_level >= DEBUG_LEVEL_INFO)
4206 printk("hdlcdev_rx(%s)\n", dev->name);
4209 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4210 dev->stats.rx_dropped++;
4214 skb_put_data(skb, buf, size);
4216 skb->protocol = hdlc_type_trans(skb, dev);
4218 dev->stats.rx_packets++;
4219 dev->stats.rx_bytes += size;
4224 static const struct net_device_ops hdlcdev_ops = {
4225 .ndo_open = hdlcdev_open,
4226 .ndo_stop = hdlcdev_close,
4227 .ndo_start_xmit = hdlc_start_xmit,
4228 .ndo_do_ioctl = hdlcdev_ioctl,
4229 .ndo_tx_timeout = hdlcdev_tx_timeout,
4233 * called by device driver when adding device instance
4234 * do generic HDLC initialization
4236 * info pointer to device instance information
4238 * returns 0 if success, otherwise error code
4240 static int hdlcdev_init(MGSLPC_INFO *info)
4243 struct net_device *dev;
4246 /* allocate and initialize network and HDLC layer objects */
4248 dev = alloc_hdlcdev(info);
4250 printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__);
4254 /* for network layer reporting purposes only */
4255 dev->base_addr = info->io_base;
4256 dev->irq = info->irq_level;
4258 /* network layer callbacks and settings */
4259 dev->netdev_ops = &hdlcdev_ops;
4260 dev->watchdog_timeo = 10 * HZ;
4261 dev->tx_queue_len = 50;
4263 /* generic HDLC layer callbacks and settings */
4264 hdlc = dev_to_hdlc(dev);
4265 hdlc->attach = hdlcdev_attach;
4266 hdlc->xmit = hdlcdev_xmit;
4268 /* register objects with HDLC layer */
4269 rc = register_hdlc_device(dev);
4271 printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__);
4281 * called by device driver when removing device instance
4282 * do generic HDLC cleanup
4284 * info pointer to device instance information
4286 static void hdlcdev_exit(MGSLPC_INFO *info)
4288 unregister_hdlc_device(info->netdev);
4289 free_netdev(info->netdev);
4290 info->netdev = NULL;
4293 #endif /* CONFIG_HDLC */