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 <asm/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) */
212 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
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(unsigned long context);
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=0;
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 info->port.close_delay = 5*HZ/10;
534 info->port.closing_wait = 30*HZ;
535 init_waitqueue_head(&info->status_event_wait_q);
536 init_waitqueue_head(&info->event_wait_q);
537 spin_lock_init(&info->lock);
538 spin_lock_init(&info->netlock);
539 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
540 info->idle_mode = HDLC_TXIDLE_FLAGS;
541 info->imra_value = 0xffff;
542 info->imrb_value = 0xffff;
543 info->pim_value = 0xff;
548 /* Initialize the struct pcmcia_device structure */
550 ret = mgslpc_config(link);
554 ret = mgslpc_add_device(info);
561 mgslpc_release((u_long)link);
563 tty_port_destroy(&info->port);
568 /* Card has been inserted.
571 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
573 return pcmcia_request_io(p_dev);
576 static int mgslpc_config(struct pcmcia_device *link)
578 MGSLPC_INFO *info = link->priv;
581 if (debug_level >= DEBUG_LEVEL_INFO)
582 printk("mgslpc_config(0x%p)\n", link);
584 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
586 ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
590 link->config_index = 8;
591 link->config_regs = PRESENT_OPTION;
593 ret = pcmcia_request_irq(link, mgslpc_isr);
596 ret = pcmcia_enable_device(link);
600 info->io_base = link->resource[0]->start;
601 info->irq_level = link->irq;
605 mgslpc_release((u_long)link);
609 /* Card has been removed.
610 * Unregister device and release PCMCIA configuration.
611 * If device is open, postpone until it is closed.
613 static void mgslpc_release(u_long arg)
615 struct pcmcia_device *link = (struct pcmcia_device *)arg;
617 if (debug_level >= DEBUG_LEVEL_INFO)
618 printk("mgslpc_release(0x%p)\n", link);
620 pcmcia_disable_device(link);
623 static void mgslpc_detach(struct pcmcia_device *link)
625 if (debug_level >= DEBUG_LEVEL_INFO)
626 printk("mgslpc_detach(0x%p)\n", link);
628 ((MGSLPC_INFO *)link->priv)->stop = 1;
629 mgslpc_release((u_long)link);
631 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
634 static int mgslpc_suspend(struct pcmcia_device *link)
636 MGSLPC_INFO *info = link->priv;
643 static int mgslpc_resume(struct pcmcia_device *link)
645 MGSLPC_INFO *info = link->priv;
653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
654 char *name, const char *routine)
656 #ifdef MGSLPC_PARANOIA_CHECK
657 static const char *badmagic =
658 "Warning: bad magic number for mgsl struct (%s) in %s\n";
659 static const char *badinfo =
660 "Warning: null mgslpc_info for (%s) in %s\n";
663 printk(badinfo, name, routine);
666 if (info->magic != MGSLPC_MAGIC) {
667 printk(badmagic, name, routine);
678 #define CMD_RXFIFO BIT7 // release current rx FIFO
679 #define CMD_RXRESET BIT6 // receiver reset
680 #define CMD_RXFIFO_READ BIT5
681 #define CMD_START_TIMER BIT4
682 #define CMD_TXFIFO BIT3 // release current tx FIFO
683 #define CMD_TXEOM BIT1 // transmit end message
684 #define CMD_TXRESET BIT0 // transmit reset
686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
689 /* wait for command completion */
690 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
700 wait_command_complete(info, channel);
701 write_reg(info, (unsigned char) (channel + CMDR), cmd);
704 static void tx_pause(struct tty_struct *tty)
706 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
709 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
711 if (debug_level >= DEBUG_LEVEL_INFO)
712 printk("tx_pause(%s)\n", info->device_name);
714 spin_lock_irqsave(&info->lock, flags);
715 if (info->tx_enabled)
717 spin_unlock_irqrestore(&info->lock, flags);
720 static void tx_release(struct tty_struct *tty)
722 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
725 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
727 if (debug_level >= DEBUG_LEVEL_INFO)
728 printk("tx_release(%s)\n", info->device_name);
730 spin_lock_irqsave(&info->lock, flags);
731 if (!info->tx_enabled)
733 spin_unlock_irqrestore(&info->lock, flags);
736 /* Return next bottom half action to perform.
737 * or 0 if nothing to do.
739 static int bh_action(MGSLPC_INFO *info)
744 spin_lock_irqsave(&info->lock, flags);
746 if (info->pending_bh & BH_RECEIVE) {
747 info->pending_bh &= ~BH_RECEIVE;
749 } else if (info->pending_bh & BH_TRANSMIT) {
750 info->pending_bh &= ~BH_TRANSMIT;
752 } else if (info->pending_bh & BH_STATUS) {
753 info->pending_bh &= ~BH_STATUS;
758 /* Mark BH routine as complete */
759 info->bh_running = false;
760 info->bh_requested = false;
763 spin_unlock_irqrestore(&info->lock, flags);
768 static void bh_handler(struct work_struct *work)
770 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
771 struct tty_struct *tty;
777 if (debug_level >= DEBUG_LEVEL_BH)
778 printk("%s(%d):bh_handler(%s) entry\n",
779 __FILE__,__LINE__,info->device_name);
781 info->bh_running = true;
782 tty = tty_port_tty_get(&info->port);
784 while((action = bh_action(info)) != 0) {
786 /* Process work item */
787 if (debug_level >= DEBUG_LEVEL_BH)
788 printk("%s(%d):bh_handler() work item action=%d\n",
789 __FILE__,__LINE__,action);
794 while(rx_get_frame(info, tty));
797 bh_transmit(info, tty);
803 /* unknown work item ID */
804 printk("Unknown work item ID=%08X!\n", action);
810 if (debug_level >= DEBUG_LEVEL_BH)
811 printk("%s(%d):bh_handler(%s) exit\n",
812 __FILE__,__LINE__,info->device_name);
815 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
817 if (debug_level >= DEBUG_LEVEL_BH)
818 printk("bh_transmit() entry on %s\n", info->device_name);
824 static void bh_status(MGSLPC_INFO *info)
826 info->ri_chkcount = 0;
827 info->dsr_chkcount = 0;
828 info->dcd_chkcount = 0;
829 info->cts_chkcount = 0;
832 /* eom: non-zero = end of frame */
833 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
835 unsigned char data[2];
836 unsigned char fifo_count, read_count, i;
837 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
839 if (debug_level >= DEBUG_LEVEL_ISR)
840 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
842 if (!info->rx_enabled)
845 if (info->rx_frame_count >= info->rx_buf_count) {
846 /* no more free buffers */
847 issue_command(info, CHA, CMD_RXRESET);
848 info->pending_bh |= BH_RECEIVE;
849 info->rx_overflow = true;
850 info->icount.buf_overrun++;
855 /* end of frame, get FIFO count from RBCL register */
856 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
863 if (fifo_count == 1) {
865 data[0] = read_reg(info, CHA + RXFIFO);
868 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
870 fifo_count -= read_count;
871 if (!fifo_count && eom)
872 buf->status = data[--read_count];
874 for (i = 0; i < read_count; i++) {
875 if (buf->count >= info->max_frame_size) {
876 /* frame too large, reset receiver and reset current buffer */
877 issue_command(info, CHA, CMD_RXRESET);
881 *(buf->data + buf->count) = data[i];
884 } while (fifo_count);
887 info->pending_bh |= BH_RECEIVE;
888 info->rx_frame_count++;
890 if (info->rx_put >= info->rx_buf_count)
893 issue_command(info, CHA, CMD_RXFIFO);
896 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
898 unsigned char data, status, flag;
901 struct mgsl_icount *icount = &info->icount;
904 /* tty is not available anymore */
905 issue_command(info, CHA, CMD_RXRESET);
906 if (debug_level >= DEBUG_LEVEL_ISR)
907 printk("%s(%d):rx_ready_async(tty=NULL)\n", __FILE__, __LINE__);
912 /* early termination, get FIFO count from RBCL register */
913 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
915 /* Zero fifo count could mean 0 or 32 bytes available.
916 * If BIT5 of STAR is set then at least 1 byte is available.
918 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
923 tty_buffer_request_room(tty, fifo_count);
924 /* Flush received async data to receive data buffer. */
926 data = read_reg(info, CHA + RXFIFO);
927 status = read_reg(info, CHA + RXFIFO);
933 // if no frameing/crc error then save data
935 // BIT6:framing error
937 if (status & (BIT7 + BIT6)) {
943 /* discard char if tty control flags say so */
944 if (status & info->ignore_status_mask)
947 status &= info->read_status_mask;
951 else if (status & BIT6)
954 work += tty_insert_flip_char(tty, data, flag);
956 issue_command(info, CHA, CMD_RXFIFO);
958 if (debug_level >= DEBUG_LEVEL_ISR) {
959 printk("%s(%d):rx_ready_async",
961 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
962 __FILE__,__LINE__,icount->rx,icount->brk,
963 icount->parity,icount->frame,icount->overrun);
967 tty_flip_buffer_push(tty);
971 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
973 if (!info->tx_active)
976 info->tx_active = false;
977 info->tx_aborting = false;
979 if (info->params.mode == MGSL_MODE_ASYNC)
982 info->tx_count = info->tx_put = info->tx_get = 0;
983 del_timer(&info->tx_timer);
985 if (info->drop_rts_on_tx_done) {
987 if (info->serial_signals & SerialSignal_RTS) {
988 info->serial_signals &= ~SerialSignal_RTS;
991 info->drop_rts_on_tx_done = false;
994 #if SYNCLINK_GENERIC_HDLC
996 hdlcdev_tx_done(info);
1000 if (tty && (tty->stopped || tty->hw_stopped)) {
1004 info->pending_bh |= BH_TRANSMIT;
1008 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1010 unsigned char fifo_count = 32;
1013 if (debug_level >= DEBUG_LEVEL_ISR)
1014 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1016 if (info->params.mode == MGSL_MODE_HDLC) {
1017 if (!info->tx_active)
1020 if (tty && (tty->stopped || tty->hw_stopped)) {
1024 if (!info->tx_count)
1025 info->tx_active = false;
1028 if (!info->tx_count)
1031 while (info->tx_count && fifo_count) {
1032 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1035 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1037 write_reg16(info, CHA + TXFIFO,
1038 *((unsigned short*)(info->tx_buf + info->tx_get)));
1040 info->tx_count -= c;
1041 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1045 if (info->params.mode == MGSL_MODE_ASYNC) {
1046 if (info->tx_count < WAKEUP_CHARS)
1047 info->pending_bh |= BH_TRANSMIT;
1048 issue_command(info, CHA, CMD_TXFIFO);
1051 issue_command(info, CHA, CMD_TXFIFO);
1053 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1057 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1060 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1061 irq_disable(info, CHB, IRQ_CTS);
1063 if (info->serial_signals & SerialSignal_CTS)
1064 info->input_signal_events.cts_up++;
1066 info->input_signal_events.cts_down++;
1067 wake_up_interruptible(&info->status_event_wait_q);
1068 wake_up_interruptible(&info->event_wait_q);
1070 if (tty && tty_port_cts_enabled(&info->port)) {
1071 if (tty->hw_stopped) {
1072 if (info->serial_signals & SerialSignal_CTS) {
1073 if (debug_level >= DEBUG_LEVEL_ISR)
1074 printk("CTS tx start...");
1075 tty->hw_stopped = 0;
1076 tx_start(info, tty);
1077 info->pending_bh |= BH_TRANSMIT;
1081 if (!(info->serial_signals & SerialSignal_CTS)) {
1082 if (debug_level >= DEBUG_LEVEL_ISR)
1083 printk("CTS tx stop...");
1084 tty->hw_stopped = 1;
1089 info->pending_bh |= BH_STATUS;
1092 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1095 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1096 irq_disable(info, CHB, IRQ_DCD);
1098 if (info->serial_signals & SerialSignal_DCD) {
1099 info->input_signal_events.dcd_up++;
1102 info->input_signal_events.dcd_down++;
1103 #if SYNCLINK_GENERIC_HDLC
1104 if (info->netcount) {
1105 if (info->serial_signals & SerialSignal_DCD)
1106 netif_carrier_on(info->netdev);
1108 netif_carrier_off(info->netdev);
1111 wake_up_interruptible(&info->status_event_wait_q);
1112 wake_up_interruptible(&info->event_wait_q);
1114 if (info->port.flags & ASYNC_CHECK_CD) {
1115 if (debug_level >= DEBUG_LEVEL_ISR)
1116 printk("%s CD now %s...", info->device_name,
1117 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1118 if (info->serial_signals & SerialSignal_DCD)
1119 wake_up_interruptible(&info->port.open_wait);
1121 if (debug_level >= DEBUG_LEVEL_ISR)
1122 printk("doing serial hangup...");
1127 info->pending_bh |= BH_STATUS;
1130 static void dsr_change(MGSLPC_INFO *info)
1133 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1134 port_irq_disable(info, PVR_DSR);
1136 if (info->serial_signals & SerialSignal_DSR)
1137 info->input_signal_events.dsr_up++;
1139 info->input_signal_events.dsr_down++;
1140 wake_up_interruptible(&info->status_event_wait_q);
1141 wake_up_interruptible(&info->event_wait_q);
1142 info->pending_bh |= BH_STATUS;
1145 static void ri_change(MGSLPC_INFO *info)
1148 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1149 port_irq_disable(info, PVR_RI);
1151 if (info->serial_signals & SerialSignal_RI)
1152 info->input_signal_events.ri_up++;
1154 info->input_signal_events.ri_down++;
1155 wake_up_interruptible(&info->status_event_wait_q);
1156 wake_up_interruptible(&info->event_wait_q);
1157 info->pending_bh |= BH_STATUS;
1160 /* Interrupt service routine entry point.
1164 * irq interrupt number that caused interrupt
1165 * dev_id device ID supplied during interrupt registration
1167 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1169 MGSLPC_INFO *info = dev_id;
1170 struct tty_struct *tty;
1172 unsigned char gis, pis;
1175 if (debug_level >= DEBUG_LEVEL_ISR)
1176 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1178 if (!(info->p_dev->_locked))
1181 tty = tty_port_tty_get(&info->port);
1183 spin_lock(&info->lock);
1185 while ((gis = read_reg(info, CHA + GIS))) {
1186 if (debug_level >= DEBUG_LEVEL_ISR)
1187 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1189 if ((gis & 0x70) || count > 1000) {
1190 printk("synclink_cs:hardware failed or ejected\n");
1195 if (gis & (BIT1 + BIT0)) {
1196 isr = read_reg16(info, CHB + ISR);
1198 dcd_change(info, tty);
1200 cts_change(info, tty);
1202 if (gis & (BIT3 + BIT2))
1204 isr = read_reg16(info, CHA + ISR);
1205 if (isr & IRQ_TIMER) {
1206 info->irq_occurred = true;
1207 irq_disable(info, CHA, IRQ_TIMER);
1211 if (isr & IRQ_EXITHUNT) {
1212 info->icount.exithunt++;
1213 wake_up_interruptible(&info->event_wait_q);
1215 if (isr & IRQ_BREAK_ON) {
1217 if (info->port.flags & ASYNC_SAK)
1220 if (isr & IRQ_RXTIME) {
1221 issue_command(info, CHA, CMD_RXFIFO_READ);
1223 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1224 if (info->params.mode == MGSL_MODE_HDLC)
1225 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1227 rx_ready_async(info, isr & IRQ_RXEOM, tty);
1231 if (isr & IRQ_UNDERRUN) {
1232 if (info->tx_aborting)
1233 info->icount.txabort++;
1235 info->icount.txunder++;
1238 else if (isr & IRQ_ALLSENT) {
1239 info->icount.txok++;
1242 else if (isr & IRQ_TXFIFO)
1243 tx_ready(info, tty);
1246 pis = read_reg(info, CHA + PIS);
1254 /* Request bottom half processing if there's something
1255 * for it to do and the bh is not already running
1258 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1259 if (debug_level >= DEBUG_LEVEL_ISR)
1260 printk("%s(%d):%s queueing bh task.\n",
1261 __FILE__,__LINE__,info->device_name);
1262 schedule_work(&info->task);
1263 info->bh_requested = true;
1266 spin_unlock(&info->lock);
1269 if (debug_level >= DEBUG_LEVEL_ISR)
1270 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1271 __FILE__, __LINE__, info->irq_level);
1276 /* Initialize and start device.
1278 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1282 if (debug_level >= DEBUG_LEVEL_INFO)
1283 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1285 if (info->port.flags & ASYNC_INITIALIZED)
1288 if (!info->tx_buf) {
1289 /* allocate a page of memory for a transmit buffer */
1290 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1291 if (!info->tx_buf) {
1292 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1293 __FILE__, __LINE__, info->device_name);
1298 info->pending_bh = 0;
1300 memset(&info->icount, 0, sizeof(info->icount));
1302 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1304 /* Allocate and claim adapter resources */
1305 retval = claim_resources(info);
1307 /* perform existence check and diagnostics */
1309 retval = adapter_test(info);
1312 if (capable(CAP_SYS_ADMIN) && tty)
1313 set_bit(TTY_IO_ERROR, &tty->flags);
1314 release_resources(info);
1318 /* program hardware for current parameters */
1319 mgslpc_change_params(info, tty);
1322 clear_bit(TTY_IO_ERROR, &tty->flags);
1324 info->port.flags |= ASYNC_INITIALIZED;
1329 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1331 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1333 unsigned long flags;
1335 if (!(info->port.flags & ASYNC_INITIALIZED))
1338 if (debug_level >= DEBUG_LEVEL_INFO)
1339 printk("%s(%d):mgslpc_shutdown(%s)\n",
1340 __FILE__, __LINE__, info->device_name);
1342 /* clear status wait queue because status changes */
1343 /* can't happen after shutting down the hardware */
1344 wake_up_interruptible(&info->status_event_wait_q);
1345 wake_up_interruptible(&info->event_wait_q);
1347 del_timer_sync(&info->tx_timer);
1350 free_page((unsigned long) info->tx_buf);
1351 info->tx_buf = NULL;
1354 spin_lock_irqsave(&info->lock, flags);
1359 /* TODO:disable interrupts instead of reset to preserve signal states */
1362 if (!tty || tty->termios.c_cflag & HUPCL) {
1363 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1367 spin_unlock_irqrestore(&info->lock, flags);
1369 release_resources(info);
1372 set_bit(TTY_IO_ERROR, &tty->flags);
1374 info->port.flags &= ~ASYNC_INITIALIZED;
1377 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1379 unsigned long flags;
1381 spin_lock_irqsave(&info->lock, flags);
1385 info->tx_count = info->tx_put = info->tx_get = 0;
1387 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1394 info->dcd_chkcount = 0;
1395 info->cts_chkcount = 0;
1396 info->ri_chkcount = 0;
1397 info->dsr_chkcount = 0;
1399 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1400 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1403 if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1406 spin_unlock_irqrestore(&info->lock, flags);
1409 /* Reconfigure adapter based on new parameters
1411 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1419 if (debug_level >= DEBUG_LEVEL_INFO)
1420 printk("%s(%d):mgslpc_change_params(%s)\n",
1421 __FILE__, __LINE__, info->device_name);
1423 cflag = tty->termios.c_cflag;
1425 /* if B0 rate (hangup) specified then negate DTR and RTS */
1426 /* otherwise assert DTR and RTS */
1428 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1430 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1432 /* byte size and parity */
1434 switch (cflag & CSIZE) {
1435 case CS5: info->params.data_bits = 5; break;
1436 case CS6: info->params.data_bits = 6; break;
1437 case CS7: info->params.data_bits = 7; break;
1438 case CS8: info->params.data_bits = 8; break;
1439 default: info->params.data_bits = 7; break;
1443 info->params.stop_bits = 2;
1445 info->params.stop_bits = 1;
1447 info->params.parity = ASYNC_PARITY_NONE;
1448 if (cflag & PARENB) {
1450 info->params.parity = ASYNC_PARITY_ODD;
1452 info->params.parity = ASYNC_PARITY_EVEN;
1455 info->params.parity = ASYNC_PARITY_SPACE;
1459 /* calculate number of jiffies to transmit a full
1460 * FIFO (32 bytes) at specified data rate
1462 bits_per_char = info->params.data_bits +
1463 info->params.stop_bits + 1;
1465 /* if port data rate is set to 460800 or less then
1466 * allow tty settings to override, otherwise keep the
1467 * current data rate.
1469 if (info->params.data_rate <= 460800) {
1470 info->params.data_rate = tty_get_baud_rate(tty);
1473 if (info->params.data_rate) {
1474 info->timeout = (32*HZ*bits_per_char) /
1475 info->params.data_rate;
1477 info->timeout += HZ/50; /* Add .02 seconds of slop */
1479 if (cflag & CRTSCTS)
1480 info->port.flags |= ASYNC_CTS_FLOW;
1482 info->port.flags &= ~ASYNC_CTS_FLOW;
1485 info->port.flags &= ~ASYNC_CHECK_CD;
1487 info->port.flags |= ASYNC_CHECK_CD;
1489 /* process tty input control flags */
1491 info->read_status_mask = 0;
1493 info->read_status_mask |= BIT7 | BIT6;
1495 info->ignore_status_mask |= BIT7 | BIT6;
1497 mgslpc_program_hw(info, tty);
1500 /* Add a character to the transmit buffer
1502 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1504 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1505 unsigned long flags;
1507 if (debug_level >= DEBUG_LEVEL_INFO) {
1508 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1509 __FILE__, __LINE__, ch, info->device_name);
1512 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1518 spin_lock_irqsave(&info->lock, flags);
1520 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1521 if (info->tx_count < TXBUFSIZE - 1) {
1522 info->tx_buf[info->tx_put++] = ch;
1523 info->tx_put &= TXBUFSIZE-1;
1528 spin_unlock_irqrestore(&info->lock, flags);
1532 /* Enable transmitter so remaining characters in the
1533 * transmit buffer are sent.
1535 static void mgslpc_flush_chars(struct tty_struct *tty)
1537 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1538 unsigned long flags;
1540 if (debug_level >= DEBUG_LEVEL_INFO)
1541 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1542 __FILE__, __LINE__, info->device_name, info->tx_count);
1544 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1547 if (info->tx_count <= 0 || tty->stopped ||
1548 tty->hw_stopped || !info->tx_buf)
1551 if (debug_level >= DEBUG_LEVEL_INFO)
1552 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1553 __FILE__, __LINE__, info->device_name);
1555 spin_lock_irqsave(&info->lock, flags);
1556 if (!info->tx_active)
1557 tx_start(info, tty);
1558 spin_unlock_irqrestore(&info->lock, flags);
1561 /* Send a block of data
1565 * tty pointer to tty information structure
1566 * buf pointer to buffer containing send data
1567 * count size of send data in bytes
1569 * Returns: number of characters written
1571 static int mgslpc_write(struct tty_struct * tty,
1572 const unsigned char *buf, int count)
1575 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1576 unsigned long flags;
1578 if (debug_level >= DEBUG_LEVEL_INFO)
1579 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1580 __FILE__, __LINE__, info->device_name, count);
1582 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1586 if (info->params.mode == MGSL_MODE_HDLC) {
1587 if (count > TXBUFSIZE) {
1591 if (info->tx_active)
1593 else if (info->tx_count)
1599 min(TXBUFSIZE - info->tx_count - 1,
1600 TXBUFSIZE - info->tx_put));
1604 memcpy(info->tx_buf + info->tx_put, buf, c);
1606 spin_lock_irqsave(&info->lock, flags);
1607 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1608 info->tx_count += c;
1609 spin_unlock_irqrestore(&info->lock, flags);
1616 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1617 spin_lock_irqsave(&info->lock, flags);
1618 if (!info->tx_active)
1619 tx_start(info, tty);
1620 spin_unlock_irqrestore(&info->lock, flags);
1623 if (debug_level >= DEBUG_LEVEL_INFO)
1624 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1625 __FILE__, __LINE__, info->device_name, ret);
1629 /* Return the count of free bytes in transmit buffer
1631 static int mgslpc_write_room(struct tty_struct *tty)
1633 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1636 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1639 if (info->params.mode == MGSL_MODE_HDLC) {
1640 /* HDLC (frame oriented) mode */
1641 if (info->tx_active)
1644 return HDLC_MAX_FRAME_SIZE;
1646 ret = TXBUFSIZE - info->tx_count - 1;
1651 if (debug_level >= DEBUG_LEVEL_INFO)
1652 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1653 __FILE__, __LINE__, info->device_name, ret);
1657 /* Return the count of bytes in transmit buffer
1659 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1661 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1664 if (debug_level >= DEBUG_LEVEL_INFO)
1665 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1666 __FILE__, __LINE__, info->device_name);
1668 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1671 if (info->params.mode == MGSL_MODE_HDLC)
1672 rc = info->tx_active ? info->max_frame_size : 0;
1674 rc = info->tx_count;
1676 if (debug_level >= DEBUG_LEVEL_INFO)
1677 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1678 __FILE__, __LINE__, info->device_name, rc);
1683 /* Discard all data in the send buffer
1685 static void mgslpc_flush_buffer(struct tty_struct *tty)
1687 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1688 unsigned long flags;
1690 if (debug_level >= DEBUG_LEVEL_INFO)
1691 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1692 __FILE__, __LINE__, info->device_name);
1694 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1697 spin_lock_irqsave(&info->lock, flags);
1698 info->tx_count = info->tx_put = info->tx_get = 0;
1699 del_timer(&info->tx_timer);
1700 spin_unlock_irqrestore(&info->lock, flags);
1702 wake_up_interruptible(&tty->write_wait);
1706 /* Send a high-priority XON/XOFF character
1708 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1710 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1711 unsigned long flags;
1713 if (debug_level >= DEBUG_LEVEL_INFO)
1714 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1715 __FILE__, __LINE__, info->device_name, ch);
1717 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1722 spin_lock_irqsave(&info->lock, flags);
1723 if (!info->tx_enabled)
1724 tx_start(info, tty);
1725 spin_unlock_irqrestore(&info->lock, flags);
1729 /* Signal remote device to throttle send data (our receive data)
1731 static void mgslpc_throttle(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_throttle(%s) entry\n",
1738 __FILE__, __LINE__, info->device_name);
1740 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1744 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1746 if (tty->termios.c_cflag & CRTSCTS) {
1747 spin_lock_irqsave(&info->lock, flags);
1748 info->serial_signals &= ~SerialSignal_RTS;
1750 spin_unlock_irqrestore(&info->lock, flags);
1754 /* Signal remote device to stop throttling send data (our receive data)
1756 static void mgslpc_unthrottle(struct tty_struct * tty)
1758 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1759 unsigned long flags;
1761 if (debug_level >= DEBUG_LEVEL_INFO)
1762 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1763 __FILE__, __LINE__, info->device_name);
1765 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1772 mgslpc_send_xchar(tty, START_CHAR(tty));
1775 if (tty->termios.c_cflag & CRTSCTS) {
1776 spin_lock_irqsave(&info->lock, flags);
1777 info->serial_signals |= SerialSignal_RTS;
1779 spin_unlock_irqrestore(&info->lock, flags);
1783 /* get the current serial statistics
1785 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1788 if (debug_level >= DEBUG_LEVEL_INFO)
1789 printk("get_params(%s)\n", info->device_name);
1791 memset(&info->icount, 0, sizeof(info->icount));
1793 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1800 /* get the current serial parameters
1802 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1805 if (debug_level >= DEBUG_LEVEL_INFO)
1806 printk("get_params(%s)\n", info->device_name);
1807 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1813 /* set the serial parameters
1817 * info pointer to device instance data
1818 * new_params user buffer containing new serial params
1820 * Returns: 0 if success, otherwise error code
1822 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1824 unsigned long flags;
1825 MGSL_PARAMS tmp_params;
1828 if (debug_level >= DEBUG_LEVEL_INFO)
1829 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1831 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1833 if (debug_level >= DEBUG_LEVEL_INFO)
1834 printk("%s(%d):set_params(%s) user buffer copy failed\n",
1835 __FILE__, __LINE__, info->device_name);
1839 spin_lock_irqsave(&info->lock, flags);
1840 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1841 spin_unlock_irqrestore(&info->lock, flags);
1843 mgslpc_change_params(info, tty);
1848 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1851 if (debug_level >= DEBUG_LEVEL_INFO)
1852 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1853 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1859 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1861 unsigned long flags;
1862 if (debug_level >= DEBUG_LEVEL_INFO)
1863 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1864 spin_lock_irqsave(&info->lock, flags);
1865 info->idle_mode = idle_mode;
1867 spin_unlock_irqrestore(&info->lock, flags);
1871 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1874 if (debug_level >= DEBUG_LEVEL_INFO)
1875 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1876 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1882 static int set_interface(MGSLPC_INFO * info, int if_mode)
1884 unsigned long flags;
1886 if (debug_level >= DEBUG_LEVEL_INFO)
1887 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1888 spin_lock_irqsave(&info->lock, flags);
1889 info->if_mode = if_mode;
1891 val = read_reg(info, PVR) & 0x0f;
1892 switch (info->if_mode)
1894 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1895 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1896 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1898 write_reg(info, PVR, val);
1900 spin_unlock_irqrestore(&info->lock, flags);
1904 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1906 unsigned long flags;
1908 if (debug_level >= DEBUG_LEVEL_INFO)
1909 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1911 spin_lock_irqsave(&info->lock, flags);
1913 if (!info->tx_enabled)
1914 tx_start(info, tty);
1916 if (info->tx_enabled)
1919 spin_unlock_irqrestore(&info->lock, flags);
1923 static int tx_abort(MGSLPC_INFO * info)
1925 unsigned long flags;
1927 if (debug_level >= DEBUG_LEVEL_INFO)
1928 printk("tx_abort(%s)\n", info->device_name);
1930 spin_lock_irqsave(&info->lock, flags);
1931 if (info->tx_active && info->tx_count &&
1932 info->params.mode == MGSL_MODE_HDLC) {
1933 /* clear data count so FIFO is not filled on next IRQ.
1934 * This results in underrun and abort transmission.
1936 info->tx_count = info->tx_put = info->tx_get = 0;
1937 info->tx_aborting = true;
1939 spin_unlock_irqrestore(&info->lock, flags);
1943 static int set_rxenable(MGSLPC_INFO * info, int enable)
1945 unsigned long flags;
1947 if (debug_level >= DEBUG_LEVEL_INFO)
1948 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1950 spin_lock_irqsave(&info->lock, flags);
1952 if (!info->rx_enabled)
1955 if (info->rx_enabled)
1958 spin_unlock_irqrestore(&info->lock, flags);
1962 /* wait for specified event to occur
1964 * Arguments: info pointer to device instance data
1965 * mask pointer to bitmask of events to wait for
1966 * Return Value: 0 if successful and bit mask updated with
1967 * of events triggerred,
1968 * otherwise error code
1970 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1972 unsigned long flags;
1975 struct mgsl_icount cprev, cnow;
1978 struct _input_signal_events oldsigs, newsigs;
1979 DECLARE_WAITQUEUE(wait, current);
1981 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1985 if (debug_level >= DEBUG_LEVEL_INFO)
1986 printk("wait_events(%s,%d)\n", info->device_name, mask);
1988 spin_lock_irqsave(&info->lock, flags);
1990 /* return immediately if state matches requested events */
1992 s = info->serial_signals;
1994 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1995 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1996 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1997 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1999 spin_unlock_irqrestore(&info->lock, flags);
2003 /* save current irq counts */
2004 cprev = info->icount;
2005 oldsigs = info->input_signal_events;
2007 if ((info->params.mode == MGSL_MODE_HDLC) &&
2008 (mask & MgslEvent_ExitHuntMode))
2009 irq_enable(info, CHA, IRQ_EXITHUNT);
2011 set_current_state(TASK_INTERRUPTIBLE);
2012 add_wait_queue(&info->event_wait_q, &wait);
2014 spin_unlock_irqrestore(&info->lock, flags);
2019 if (signal_pending(current)) {
2024 /* get current irq counts */
2025 spin_lock_irqsave(&info->lock, flags);
2026 cnow = info->icount;
2027 newsigs = info->input_signal_events;
2028 set_current_state(TASK_INTERRUPTIBLE);
2029 spin_unlock_irqrestore(&info->lock, flags);
2031 /* if no change, wait aborted for some reason */
2032 if (newsigs.dsr_up == oldsigs.dsr_up &&
2033 newsigs.dsr_down == oldsigs.dsr_down &&
2034 newsigs.dcd_up == oldsigs.dcd_up &&
2035 newsigs.dcd_down == oldsigs.dcd_down &&
2036 newsigs.cts_up == oldsigs.cts_up &&
2037 newsigs.cts_down == oldsigs.cts_down &&
2038 newsigs.ri_up == oldsigs.ri_up &&
2039 newsigs.ri_down == oldsigs.ri_down &&
2040 cnow.exithunt == cprev.exithunt &&
2041 cnow.rxidle == cprev.rxidle) {
2047 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2048 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2049 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2050 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2051 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2052 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2053 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2054 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2055 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2056 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2064 remove_wait_queue(&info->event_wait_q, &wait);
2065 set_current_state(TASK_RUNNING);
2067 if (mask & MgslEvent_ExitHuntMode) {
2068 spin_lock_irqsave(&info->lock, flags);
2069 if (!waitqueue_active(&info->event_wait_q))
2070 irq_disable(info, CHA, IRQ_EXITHUNT);
2071 spin_unlock_irqrestore(&info->lock, flags);
2075 PUT_USER(rc, events, mask_ptr);
2079 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2081 unsigned long flags;
2083 struct mgsl_icount cprev, cnow;
2084 DECLARE_WAITQUEUE(wait, current);
2086 /* save current irq counts */
2087 spin_lock_irqsave(&info->lock, flags);
2088 cprev = info->icount;
2089 add_wait_queue(&info->status_event_wait_q, &wait);
2090 set_current_state(TASK_INTERRUPTIBLE);
2091 spin_unlock_irqrestore(&info->lock, flags);
2095 if (signal_pending(current)) {
2100 /* get new irq counts */
2101 spin_lock_irqsave(&info->lock, flags);
2102 cnow = info->icount;
2103 set_current_state(TASK_INTERRUPTIBLE);
2104 spin_unlock_irqrestore(&info->lock, flags);
2106 /* if no change, wait aborted for some reason */
2107 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2108 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2113 /* check for change in caller specified modem input */
2114 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2115 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2116 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2117 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2124 remove_wait_queue(&info->status_event_wait_q, &wait);
2125 set_current_state(TASK_RUNNING);
2129 /* return the state of the serial control and status signals
2131 static int tiocmget(struct tty_struct *tty)
2133 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2134 unsigned int result;
2135 unsigned long flags;
2137 spin_lock_irqsave(&info->lock, flags);
2139 spin_unlock_irqrestore(&info->lock, flags);
2141 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2142 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2143 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2144 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2145 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2146 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2148 if (debug_level >= DEBUG_LEVEL_INFO)
2149 printk("%s(%d):%s tiocmget() value=%08X\n",
2150 __FILE__, __LINE__, info->device_name, result);
2154 /* set modem control signals (DTR/RTS)
2156 static int tiocmset(struct tty_struct *tty,
2157 unsigned int set, unsigned int clear)
2159 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2160 unsigned long flags;
2162 if (debug_level >= DEBUG_LEVEL_INFO)
2163 printk("%s(%d):%s tiocmset(%x,%x)\n",
2164 __FILE__, __LINE__, info->device_name, set, clear);
2166 if (set & TIOCM_RTS)
2167 info->serial_signals |= SerialSignal_RTS;
2168 if (set & TIOCM_DTR)
2169 info->serial_signals |= SerialSignal_DTR;
2170 if (clear & TIOCM_RTS)
2171 info->serial_signals &= ~SerialSignal_RTS;
2172 if (clear & TIOCM_DTR)
2173 info->serial_signals &= ~SerialSignal_DTR;
2175 spin_lock_irqsave(&info->lock, flags);
2177 spin_unlock_irqrestore(&info->lock, flags);
2182 /* Set or clear transmit break condition
2184 * Arguments: tty pointer to tty instance data
2185 * break_state -1=set break condition, 0=clear
2187 static int mgslpc_break(struct tty_struct *tty, int break_state)
2189 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2190 unsigned long flags;
2192 if (debug_level >= DEBUG_LEVEL_INFO)
2193 printk("%s(%d):mgslpc_break(%s,%d)\n",
2194 __FILE__, __LINE__, info->device_name, break_state);
2196 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2199 spin_lock_irqsave(&info->lock, flags);
2200 if (break_state == -1)
2201 set_reg_bits(info, CHA+DAFO, BIT6);
2203 clear_reg_bits(info, CHA+DAFO, BIT6);
2204 spin_unlock_irqrestore(&info->lock, flags);
2208 static int mgslpc_get_icount(struct tty_struct *tty,
2209 struct serial_icounter_struct *icount)
2211 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2212 struct mgsl_icount cnow; /* kernel counter temps */
2213 unsigned long flags;
2215 spin_lock_irqsave(&info->lock, flags);
2216 cnow = info->icount;
2217 spin_unlock_irqrestore(&info->lock, flags);
2219 icount->cts = cnow.cts;
2220 icount->dsr = cnow.dsr;
2221 icount->rng = cnow.rng;
2222 icount->dcd = cnow.dcd;
2223 icount->rx = cnow.rx;
2224 icount->tx = cnow.tx;
2225 icount->frame = cnow.frame;
2226 icount->overrun = cnow.overrun;
2227 icount->parity = cnow.parity;
2228 icount->brk = cnow.brk;
2229 icount->buf_overrun = cnow.buf_overrun;
2234 /* Service an IOCTL request
2238 * tty pointer to tty instance data
2239 * cmd IOCTL command code
2240 * arg command argument/context
2242 * Return Value: 0 if success, otherwise error code
2244 static int mgslpc_ioctl(struct tty_struct *tty,
2245 unsigned int cmd, unsigned long arg)
2247 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2248 void __user *argp = (void __user *)arg;
2250 if (debug_level >= DEBUG_LEVEL_INFO)
2251 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2252 info->device_name, cmd);
2254 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2257 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2258 (cmd != TIOCMIWAIT)) {
2259 if (tty->flags & (1 << TTY_IO_ERROR))
2264 case MGSL_IOCGPARAMS:
2265 return get_params(info, argp);
2266 case MGSL_IOCSPARAMS:
2267 return set_params(info, argp, tty);
2268 case MGSL_IOCGTXIDLE:
2269 return get_txidle(info, argp);
2270 case MGSL_IOCSTXIDLE:
2271 return set_txidle(info, (int)arg);
2273 return get_interface(info, argp);
2275 return set_interface(info,(int)arg);
2276 case MGSL_IOCTXENABLE:
2277 return set_txenable(info,(int)arg, tty);
2278 case MGSL_IOCRXENABLE:
2279 return set_rxenable(info,(int)arg);
2280 case MGSL_IOCTXABORT:
2281 return tx_abort(info);
2282 case MGSL_IOCGSTATS:
2283 return get_stats(info, argp);
2284 case MGSL_IOCWAITEVENT:
2285 return wait_events(info, argp);
2287 return modem_input_wait(info,(int)arg);
2289 return -ENOIOCTLCMD;
2294 /* Set new termios settings
2298 * tty pointer to tty structure
2299 * termios pointer to buffer to hold returned old termios
2301 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2303 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2304 unsigned long flags;
2306 if (debug_level >= DEBUG_LEVEL_INFO)
2307 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2310 /* just return if nothing has changed */
2311 if ((tty->termios.c_cflag == old_termios->c_cflag)
2312 && (RELEVANT_IFLAG(tty->termios.c_iflag)
2313 == RELEVANT_IFLAG(old_termios->c_iflag)))
2316 mgslpc_change_params(info, tty);
2318 /* Handle transition to B0 status */
2319 if (old_termios->c_cflag & CBAUD &&
2320 !(tty->termios.c_cflag & CBAUD)) {
2321 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2322 spin_lock_irqsave(&info->lock, flags);
2324 spin_unlock_irqrestore(&info->lock, flags);
2327 /* Handle transition away from B0 status */
2328 if (!(old_termios->c_cflag & CBAUD) &&
2329 tty->termios.c_cflag & CBAUD) {
2330 info->serial_signals |= SerialSignal_DTR;
2331 if (!(tty->termios.c_cflag & CRTSCTS) ||
2332 !test_bit(TTY_THROTTLED, &tty->flags)) {
2333 info->serial_signals |= SerialSignal_RTS;
2335 spin_lock_irqsave(&info->lock, flags);
2337 spin_unlock_irqrestore(&info->lock, flags);
2340 /* Handle turning off CRTSCTS */
2341 if (old_termios->c_cflag & CRTSCTS &&
2342 !(tty->termios.c_cflag & CRTSCTS)) {
2343 tty->hw_stopped = 0;
2348 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2350 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2351 struct tty_port *port = &info->port;
2353 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2356 if (debug_level >= DEBUG_LEVEL_INFO)
2357 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2358 __FILE__, __LINE__, info->device_name, port->count);
2360 WARN_ON(!port->count);
2362 if (tty_port_close_start(port, tty, filp) == 0)
2365 if (port->flags & ASYNC_INITIALIZED)
2366 mgslpc_wait_until_sent(tty, info->timeout);
2368 mgslpc_flush_buffer(tty);
2370 tty_ldisc_flush(tty);
2371 shutdown(info, tty);
2373 tty_port_close_end(port, tty);
2374 tty_port_tty_set(port, NULL);
2376 if (debug_level >= DEBUG_LEVEL_INFO)
2377 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2378 tty->driver->name, port->count);
2381 /* Wait until the transmitter is empty.
2383 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2385 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2386 unsigned long orig_jiffies, char_time;
2391 if (debug_level >= DEBUG_LEVEL_INFO)
2392 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2393 __FILE__, __LINE__, info->device_name);
2395 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2398 if (!(info->port.flags & ASYNC_INITIALIZED))
2401 orig_jiffies = jiffies;
2403 /* Set check interval to 1/5 of estimated time to
2404 * send a character, and make it at least 1. The check
2405 * interval should also be less than the timeout.
2406 * Note: use tight timings here to satisfy the NIST-PCTS.
2409 if (info->params.data_rate) {
2410 char_time = info->timeout/(32 * 5);
2417 char_time = min_t(unsigned long, char_time, timeout);
2419 if (info->params.mode == MGSL_MODE_HDLC) {
2420 while (info->tx_active) {
2421 msleep_interruptible(jiffies_to_msecs(char_time));
2422 if (signal_pending(current))
2424 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2428 while ((info->tx_count || info->tx_active) &&
2430 msleep_interruptible(jiffies_to_msecs(char_time));
2431 if (signal_pending(current))
2433 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2439 if (debug_level >= DEBUG_LEVEL_INFO)
2440 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2441 __FILE__, __LINE__, info->device_name);
2444 /* Called by tty_hangup() when a hangup is signaled.
2445 * This is the same as closing all open files for the port.
2447 static void mgslpc_hangup(struct tty_struct *tty)
2449 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2451 if (debug_level >= DEBUG_LEVEL_INFO)
2452 printk("%s(%d):mgslpc_hangup(%s)\n",
2453 __FILE__, __LINE__, info->device_name);
2455 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2458 mgslpc_flush_buffer(tty);
2459 shutdown(info, tty);
2460 tty_port_hangup(&info->port);
2463 static int carrier_raised(struct tty_port *port)
2465 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2466 unsigned long flags;
2468 spin_lock_irqsave(&info->lock, flags);
2470 spin_unlock_irqrestore(&info->lock, flags);
2472 if (info->serial_signals & SerialSignal_DCD)
2477 static void dtr_rts(struct tty_port *port, int onoff)
2479 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2480 unsigned long flags;
2482 spin_lock_irqsave(&info->lock, flags);
2484 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2486 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2488 spin_unlock_irqrestore(&info->lock, flags);
2492 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2495 struct tty_port *port;
2497 unsigned long flags;
2499 /* verify range of specified line number */
2501 if (line >= mgslpc_device_count) {
2502 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2503 __FILE__, __LINE__, line);
2507 /* find the info structure for the specified line */
2508 info = mgslpc_device_list;
2509 while(info && info->line != line)
2510 info = info->next_device;
2511 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2515 tty->driver_data = info;
2516 tty_port_tty_set(port, tty);
2518 if (debug_level >= DEBUG_LEVEL_INFO)
2519 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2520 __FILE__, __LINE__, tty->driver->name, port->count);
2522 /* If port is closing, signal caller to try again */
2523 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2524 if (port->flags & ASYNC_CLOSING)
2525 interruptible_sleep_on(&port->close_wait);
2526 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2527 -EAGAIN : -ERESTARTSYS);
2531 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2533 spin_lock_irqsave(&info->netlock, flags);
2534 if (info->netcount) {
2536 spin_unlock_irqrestore(&info->netlock, flags);
2539 spin_lock(&port->lock);
2541 spin_unlock(&port->lock);
2542 spin_unlock_irqrestore(&info->netlock, flags);
2544 if (port->count == 1) {
2545 /* 1st open on this device, init hardware */
2546 retval = startup(info, tty);
2551 retval = tty_port_block_til_ready(&info->port, tty, filp);
2553 if (debug_level >= DEBUG_LEVEL_INFO)
2554 printk("%s(%d):block_til_ready(%s) returned %d\n",
2555 __FILE__, __LINE__, info->device_name, retval);
2559 if (debug_level >= DEBUG_LEVEL_INFO)
2560 printk("%s(%d):mgslpc_open(%s) success\n",
2561 __FILE__, __LINE__, info->device_name);
2569 * /proc fs routines....
2572 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2575 unsigned long flags;
2577 seq_printf(m, "%s:io:%04X irq:%d",
2578 info->device_name, info->io_base, info->irq_level);
2580 /* output current serial signal states */
2581 spin_lock_irqsave(&info->lock, flags);
2583 spin_unlock_irqrestore(&info->lock, flags);
2587 if (info->serial_signals & SerialSignal_RTS)
2588 strcat(stat_buf, "|RTS");
2589 if (info->serial_signals & SerialSignal_CTS)
2590 strcat(stat_buf, "|CTS");
2591 if (info->serial_signals & SerialSignal_DTR)
2592 strcat(stat_buf, "|DTR");
2593 if (info->serial_signals & SerialSignal_DSR)
2594 strcat(stat_buf, "|DSR");
2595 if (info->serial_signals & SerialSignal_DCD)
2596 strcat(stat_buf, "|CD");
2597 if (info->serial_signals & SerialSignal_RI)
2598 strcat(stat_buf, "|RI");
2600 if (info->params.mode == MGSL_MODE_HDLC) {
2601 seq_printf(m, " HDLC txok:%d rxok:%d",
2602 info->icount.txok, info->icount.rxok);
2603 if (info->icount.txunder)
2604 seq_printf(m, " txunder:%d", info->icount.txunder);
2605 if (info->icount.txabort)
2606 seq_printf(m, " txabort:%d", info->icount.txabort);
2607 if (info->icount.rxshort)
2608 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2609 if (info->icount.rxlong)
2610 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2611 if (info->icount.rxover)
2612 seq_printf(m, " rxover:%d", info->icount.rxover);
2613 if (info->icount.rxcrc)
2614 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2616 seq_printf(m, " ASYNC tx:%d rx:%d",
2617 info->icount.tx, info->icount.rx);
2618 if (info->icount.frame)
2619 seq_printf(m, " fe:%d", info->icount.frame);
2620 if (info->icount.parity)
2621 seq_printf(m, " pe:%d", info->icount.parity);
2622 if (info->icount.brk)
2623 seq_printf(m, " brk:%d", info->icount.brk);
2624 if (info->icount.overrun)
2625 seq_printf(m, " oe:%d", info->icount.overrun);
2628 /* Append serial signal status to end */
2629 seq_printf(m, " %s\n", stat_buf+1);
2631 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2632 info->tx_active,info->bh_requested,info->bh_running,
2636 /* Called to print information about devices
2638 static int mgslpc_proc_show(struct seq_file *m, void *v)
2642 seq_printf(m, "synclink driver:%s\n", driver_version);
2644 info = mgslpc_device_list;
2647 info = info->next_device;
2652 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2654 return single_open(file, mgslpc_proc_show, NULL);
2657 static const struct file_operations mgslpc_proc_fops = {
2658 .owner = THIS_MODULE,
2659 .open = mgslpc_proc_open,
2661 .llseek = seq_lseek,
2662 .release = single_release,
2665 static int rx_alloc_buffers(MGSLPC_INFO *info)
2667 /* each buffer has header and data */
2668 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2670 /* calculate total allocation size for 8 buffers */
2671 info->rx_buf_total_size = info->rx_buf_size * 8;
2673 /* limit total allocated memory */
2674 if (info->rx_buf_total_size > 0x10000)
2675 info->rx_buf_total_size = 0x10000;
2677 /* calculate number of buffers */
2678 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2680 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2681 if (info->rx_buf == NULL)
2684 rx_reset_buffers(info);
2688 static void rx_free_buffers(MGSLPC_INFO *info)
2690 kfree(info->rx_buf);
2691 info->rx_buf = NULL;
2694 static int claim_resources(MGSLPC_INFO *info)
2696 if (rx_alloc_buffers(info) < 0) {
2697 printk("Can't allocate rx buffer %s\n", info->device_name);
2698 release_resources(info);
2704 static void release_resources(MGSLPC_INFO *info)
2706 if (debug_level >= DEBUG_LEVEL_INFO)
2707 printk("release_resources(%s)\n", info->device_name);
2708 rx_free_buffers(info);
2711 /* Add the specified device instance data structure to the
2712 * global linked list of devices and increment the device count.
2714 * Arguments: info pointer to device instance data
2716 static int mgslpc_add_device(MGSLPC_INFO *info)
2718 MGSLPC_INFO *current_dev = NULL;
2719 struct device *tty_dev;
2722 info->next_device = NULL;
2723 info->line = mgslpc_device_count;
2724 sprintf(info->device_name,"ttySLP%d",info->line);
2726 if (info->line < MAX_DEVICE_COUNT) {
2727 if (maxframe[info->line])
2728 info->max_frame_size = maxframe[info->line];
2731 mgslpc_device_count++;
2733 if (!mgslpc_device_list)
2734 mgslpc_device_list = info;
2736 current_dev = mgslpc_device_list;
2737 while (current_dev->next_device)
2738 current_dev = current_dev->next_device;
2739 current_dev->next_device = info;
2742 if (info->max_frame_size < 4096)
2743 info->max_frame_size = 4096;
2744 else if (info->max_frame_size > 65535)
2745 info->max_frame_size = 65535;
2747 printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2748 info->device_name, info->io_base, info->irq_level);
2750 #if SYNCLINK_GENERIC_HDLC
2751 ret = hdlcdev_init(info);
2756 tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2758 if (IS_ERR(tty_dev)) {
2759 ret = PTR_ERR(tty_dev);
2760 #if SYNCLINK_GENERIC_HDLC
2770 current_dev->next_device = NULL;
2772 mgslpc_device_list = NULL;
2773 mgslpc_device_count--;
2777 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2779 MGSLPC_INFO *info = mgslpc_device_list;
2780 MGSLPC_INFO *last = NULL;
2783 if (info == remove_info) {
2785 last->next_device = info->next_device;
2787 mgslpc_device_list = info->next_device;
2788 tty_unregister_device(serial_driver, info->line);
2789 #if SYNCLINK_GENERIC_HDLC
2792 release_resources(info);
2793 tty_port_destroy(&info->port);
2795 mgslpc_device_count--;
2799 info = info->next_device;
2803 static const struct pcmcia_device_id mgslpc_ids[] = {
2804 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2807 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2809 static struct pcmcia_driver mgslpc_driver = {
2810 .owner = THIS_MODULE,
2811 .name = "synclink_cs",
2812 .probe = mgslpc_probe,
2813 .remove = mgslpc_detach,
2814 .id_table = mgslpc_ids,
2815 .suspend = mgslpc_suspend,
2816 .resume = mgslpc_resume,
2819 static const struct tty_operations mgslpc_ops = {
2820 .open = mgslpc_open,
2821 .close = mgslpc_close,
2822 .write = mgslpc_write,
2823 .put_char = mgslpc_put_char,
2824 .flush_chars = mgslpc_flush_chars,
2825 .write_room = mgslpc_write_room,
2826 .chars_in_buffer = mgslpc_chars_in_buffer,
2827 .flush_buffer = mgslpc_flush_buffer,
2828 .ioctl = mgslpc_ioctl,
2829 .throttle = mgslpc_throttle,
2830 .unthrottle = mgslpc_unthrottle,
2831 .send_xchar = mgslpc_send_xchar,
2832 .break_ctl = mgslpc_break,
2833 .wait_until_sent = mgslpc_wait_until_sent,
2834 .set_termios = mgslpc_set_termios,
2836 .start = tx_release,
2837 .hangup = mgslpc_hangup,
2838 .tiocmget = tiocmget,
2839 .tiocmset = tiocmset,
2840 .get_icount = mgslpc_get_icount,
2841 .proc_fops = &mgslpc_proc_fops,
2844 static int __init synclink_cs_init(void)
2848 if (break_on_load) {
2849 mgslpc_get_text_ptr();
2853 serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2854 TTY_DRIVER_REAL_RAW |
2855 TTY_DRIVER_DYNAMIC_DEV);
2856 if (IS_ERR(serial_driver)) {
2857 rc = PTR_ERR(serial_driver);
2861 /* Initialize the tty_driver structure */
2862 serial_driver->driver_name = "synclink_cs";
2863 serial_driver->name = "ttySLP";
2864 serial_driver->major = ttymajor;
2865 serial_driver->minor_start = 64;
2866 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2867 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2868 serial_driver->init_termios = tty_std_termios;
2869 serial_driver->init_termios.c_cflag =
2870 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2871 tty_set_operations(serial_driver, &mgslpc_ops);
2873 rc = tty_register_driver(serial_driver);
2875 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2876 __FILE__, __LINE__);
2880 rc = pcmcia_register_driver(&mgslpc_driver);
2884 printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2885 serial_driver->major);
2889 tty_unregister_driver(serial_driver);
2891 put_tty_driver(serial_driver);
2896 static void __exit synclink_cs_exit(void)
2898 pcmcia_unregister_driver(&mgslpc_driver);
2899 tty_unregister_driver(serial_driver);
2900 put_tty_driver(serial_driver);
2903 module_init(synclink_cs_init);
2904 module_exit(synclink_cs_exit);
2906 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2911 /* note:standard BRG mode is broken in V3.2 chip
2912 * so enhanced mode is always used
2920 for (M = 1; N > 64 && M < 16; M++)
2926 * BGR[7..0] contained in BGR register
2927 * BGR[9..8] contained in CCR2[7..6]
2928 * divisor = (N+1)*2^M
2930 * Note: M *must* not be zero (causes asymetric duty cycle)
2932 write_reg(info, (unsigned char) (channel + BGR),
2933 (unsigned char) ((M << 6) + N));
2934 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2935 val |= ((M << 4) & 0xc0);
2936 write_reg(info, (unsigned char) (channel + CCR2), val);
2940 /* Enabled the AUX clock output at the specified frequency.
2942 static void enable_auxclk(MGSLPC_INFO *info)
2948 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2949 * 05 ADM Address Mode, 0 = no addr recognition
2950 * 04 TMD Timer Mode, 0 = external
2951 * 03 RAC Receiver Active, 0 = inactive
2952 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2953 * 01 TRS Timer Resolution, 1=512
2954 * 00 TLP Test Loop, 0 = no loop
2960 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2961 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2963 write_reg(info, CHB + MODE, val);
2967 * 07 PU Power Up, 1=active, 0=power down
2968 * 06 MCE Master Clock Enable, 1=enabled
2970 * 04..02 SC[2..0] Encoding
2971 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2975 write_reg(info, CHB + CCR0, 0xc0);
2979 * 07 SFLG Shared Flag, 0 = disable shared flags
2980 * 06 GALP Go Active On Loop, 0 = not used
2981 * 05 GLP Go On Loop, 0 = not used
2982 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2983 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2984 * 02..00 CM[2..0] Clock Mode
2988 write_reg(info, CHB + CCR1, 0x17);
2992 * 07..06 BGR[9..8] Baud rate bits 9..8
2993 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2994 * 04 SSEL Clock source select, 1=submode b
2995 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2996 * 02 RWX Read/Write Exchange 0=disabled
2997 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2998 * 00 DIV, data inversion 0=disabled, 1=enabled
3002 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3003 write_reg(info, CHB + CCR2, 0x38);
3005 write_reg(info, CHB + CCR2, 0x30);
3009 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3010 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3011 * 05 TST1 Test Pin, 0=normal operation
3012 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3013 * 03..02 Reserved, must be 0
3014 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3018 write_reg(info, CHB + CCR4, 0x50);
3020 /* if auxclk not enabled, set internal BRG so
3021 * CTS transitions can be detected (requires TxC)
3023 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3024 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3026 mgslpc_set_rate(info, CHB, 921600);
3029 static void loopback_enable(MGSLPC_INFO *info)
3033 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3034 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3035 write_reg(info, CHA + CCR1, val);
3037 /* CCR2:04 SSEL Clock source select, 1=submode b */
3038 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3039 write_reg(info, CHA + CCR2, val);
3041 /* set LinkSpeed if available, otherwise default to 2Mbps */
3042 if (info->params.clock_speed)
3043 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3045 mgslpc_set_rate(info, CHA, 1843200);
3047 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3048 val = read_reg(info, CHA + MODE) | BIT0;
3049 write_reg(info, CHA + MODE, val);
3052 static void hdlc_mode(MGSLPC_INFO *info)
3055 unsigned char clkmode, clksubmode;
3057 /* disable all interrupts */
3058 irq_disable(info, CHA, 0xffff);
3059 irq_disable(info, CHB, 0xffff);
3060 port_irq_disable(info, 0xff);
3062 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3063 clkmode = clksubmode = 0;
3064 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3065 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3066 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3068 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3069 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3070 /* clock mode 7b, rcv = BRG, xmt = BRG */
3073 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3074 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3075 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3079 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3082 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3083 /* clock mode 0b, rcv = RxC, xmt = BRG */
3089 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3090 * 05 ADM Address Mode, 0 = no addr recognition
3091 * 04 TMD Timer Mode, 0 = external
3092 * 03 RAC Receiver Active, 0 = inactive
3093 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3094 * 01 TRS Timer Resolution, 1=512
3095 * 00 TLP Test Loop, 0 = no loop
3100 if (info->params.loopback)
3103 /* preserve RTS state */
3104 if (info->serial_signals & SerialSignal_RTS)
3106 write_reg(info, CHA + MODE, val);
3110 * 07 PU Power Up, 1=active, 0=power down
3111 * 06 MCE Master Clock Enable, 1=enabled
3113 * 04..02 SC[2..0] Encoding
3114 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3119 switch (info->params.encoding)
3121 case HDLC_ENCODING_NRZI:
3124 case HDLC_ENCODING_BIPHASE_SPACE:
3127 case HDLC_ENCODING_BIPHASE_MARK:
3130 case HDLC_ENCODING_BIPHASE_LEVEL:
3132 break; // Manchester
3134 write_reg(info, CHA + CCR0, val);
3138 * 07 SFLG Shared Flag, 0 = disable shared flags
3139 * 06 GALP Go Active On Loop, 0 = not used
3140 * 05 GLP Go On Loop, 0 = not used
3141 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3142 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3143 * 02..00 CM[2..0] Clock Mode
3147 val = 0x10 + clkmode;
3148 write_reg(info, CHA + CCR1, val);
3152 * 07..06 BGR[9..8] Baud rate bits 9..8
3153 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3154 * 04 SSEL Clock source select, 1=submode b
3155 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3156 * 02 RWX Read/Write Exchange 0=disabled
3157 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3158 * 00 DIV, data inversion 0=disabled, 1=enabled
3163 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3164 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3168 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3170 if (info->params.encoding == HDLC_ENCODING_NRZB)
3172 write_reg(info, CHA + CCR2, val);
3176 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3177 * 05 EPT Enable preamble transmission, 1=enabled
3178 * 04 RADD Receive address pushed to FIFO, 0=disabled
3179 * 03 CRL CRC Reset Level, 0=FFFF
3180 * 02 RCRC Rx CRC 0=On 1=Off
3181 * 01 TCRC Tx CRC 0=On 1=Off
3182 * 00 PSD DPLL Phase Shift Disable
3187 if (info->params.crc_type == HDLC_CRC_NONE)
3189 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3191 switch (info->params.preamble_length)
3193 case HDLC_PREAMBLE_LENGTH_16BITS:
3196 case HDLC_PREAMBLE_LENGTH_32BITS:
3199 case HDLC_PREAMBLE_LENGTH_64BITS:
3203 write_reg(info, CHA + CCR3, val);
3205 /* PRE - Preamble pattern */
3207 switch (info->params.preamble)
3209 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3210 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3211 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3212 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3214 write_reg(info, CHA + PRE, val);
3218 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3219 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3220 * 05 TST1 Test Pin, 0=normal operation
3221 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3222 * 03..02 Reserved, must be 0
3223 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3228 write_reg(info, CHA + CCR4, val);
3229 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3230 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3232 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3234 /* RLCR Receive length check register
3236 * 7 1=enable receive length check
3237 * 6..0 Max frame length = (RL + 1) * 32
3239 write_reg(info, CHA + RLCR, 0);
3241 /* XBCH Transmit Byte Count High
3243 * 07 DMA mode, 0 = interrupt driven
3244 * 06 NRM, 0=ABM (ignored)
3245 * 05 CAS Carrier Auto Start
3246 * 04 XC Transmit Continuously (ignored)
3247 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3252 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3254 write_reg(info, CHA + XBCH, val);
3255 enable_auxclk(info);
3256 if (info->params.loopback || info->testing_irq)
3257 loopback_enable(info);
3258 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3260 irq_enable(info, CHB, IRQ_CTS);
3261 /* PVR[3] 1=AUTO CTS active */
3262 set_reg_bits(info, CHA + PVR, BIT3);
3264 clear_reg_bits(info, CHA + PVR, BIT3);
3266 irq_enable(info, CHA,
3267 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3268 IRQ_UNDERRUN + IRQ_TXFIFO);
3269 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3270 wait_command_complete(info, CHA);
3271 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3273 /* Master clock mode enabled above to allow reset commands
3274 * to complete even if no data clocks are present.
3276 * Disable master clock mode for normal communications because
3277 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3278 * IRQ when in master clock mode.
3280 * Leave master clock mode enabled for IRQ test because the
3281 * timer IRQ used by the test can only happen in master clock mode.
3283 if (!info->testing_irq)
3284 clear_reg_bits(info, CHA + CCR0, BIT6);
3292 static void rx_stop(MGSLPC_INFO *info)
3294 if (debug_level >= DEBUG_LEVEL_ISR)
3295 printk("%s(%d):rx_stop(%s)\n",
3296 __FILE__, __LINE__, info->device_name);
3298 /* MODE:03 RAC Receiver Active, 0=inactive */
3299 clear_reg_bits(info, CHA + MODE, BIT3);
3301 info->rx_enabled = false;
3302 info->rx_overflow = false;
3305 static void rx_start(MGSLPC_INFO *info)
3307 if (debug_level >= DEBUG_LEVEL_ISR)
3308 printk("%s(%d):rx_start(%s)\n",
3309 __FILE__, __LINE__, info->device_name);
3311 rx_reset_buffers(info);
3312 info->rx_enabled = false;
3313 info->rx_overflow = false;
3315 /* MODE:03 RAC Receiver Active, 1=active */
3316 set_reg_bits(info, CHA + MODE, BIT3);
3318 info->rx_enabled = true;
3321 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3323 if (debug_level >= DEBUG_LEVEL_ISR)
3324 printk("%s(%d):tx_start(%s)\n",
3325 __FILE__, __LINE__, info->device_name);
3327 if (info->tx_count) {
3328 /* If auto RTS enabled and RTS is inactive, then assert */
3329 /* RTS and set a flag indicating that the driver should */
3330 /* negate RTS when the transmission completes. */
3331 info->drop_rts_on_tx_done = false;
3333 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3335 if (!(info->serial_signals & SerialSignal_RTS)) {
3336 info->serial_signals |= SerialSignal_RTS;
3338 info->drop_rts_on_tx_done = true;
3342 if (info->params.mode == MGSL_MODE_ASYNC) {
3343 if (!info->tx_active) {
3344 info->tx_active = true;
3345 tx_ready(info, tty);
3348 info->tx_active = true;
3349 tx_ready(info, tty);
3350 mod_timer(&info->tx_timer, jiffies +
3351 msecs_to_jiffies(5000));
3355 if (!info->tx_enabled)
3356 info->tx_enabled = true;
3359 static void tx_stop(MGSLPC_INFO *info)
3361 if (debug_level >= DEBUG_LEVEL_ISR)
3362 printk("%s(%d):tx_stop(%s)\n",
3363 __FILE__, __LINE__, info->device_name);
3365 del_timer(&info->tx_timer);
3367 info->tx_enabled = false;
3368 info->tx_active = false;
3371 /* Reset the adapter to a known state and prepare it for further use.
3373 static void reset_device(MGSLPC_INFO *info)
3375 /* power up both channels (set BIT7) */
3376 write_reg(info, CHA + CCR0, 0x80);
3377 write_reg(info, CHB + CCR0, 0x80);
3378 write_reg(info, CHA + MODE, 0);
3379 write_reg(info, CHB + MODE, 0);
3381 /* disable all interrupts */
3382 irq_disable(info, CHA, 0xffff);
3383 irq_disable(info, CHB, 0xffff);
3384 port_irq_disable(info, 0xff);
3386 /* PCR Port Configuration Register
3388 * 07..04 DEC[3..0] Serial I/F select outputs
3389 * 03 output, 1=AUTO CTS control enabled
3390 * 02 RI Ring Indicator input 0=active
3391 * 01 DSR input 0=active
3392 * 00 DTR output 0=active
3396 write_reg(info, PCR, 0x06);
3398 /* PVR Port Value Register
3400 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3401 * 03 AUTO CTS output 1=enabled
3402 * 02 RI Ring Indicator input
3404 * 00 DTR output (1=inactive)
3408 // write_reg(info, PVR, PVR_DTR);
3410 /* IPC Interrupt Port Configuration
3412 * 07 VIS 1=Masked interrupts visible
3413 * 06..05 Reserved, 0
3414 * 04..03 SLA Slave address, 00 ignored
3415 * 02 CASM Cascading Mode, 1=daisy chain
3416 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3420 write_reg(info, IPC, 0x05);
3423 static void async_mode(MGSLPC_INFO *info)
3427 /* disable all interrupts */
3428 irq_disable(info, CHA, 0xffff);
3429 irq_disable(info, CHB, 0xffff);
3430 port_irq_disable(info, 0xff);
3435 * 06 FRTS RTS State, 0=active
3436 * 05 FCTS Flow Control on CTS
3437 * 04 FLON Flow Control Enable
3438 * 03 RAC Receiver Active, 0 = inactive
3439 * 02 RTS 0=Auto RTS, 1=manual RTS
3440 * 01 TRS Timer Resolution, 1=512
3441 * 00 TLP Test Loop, 0 = no loop
3446 if (info->params.loopback)
3449 /* preserve RTS state */
3450 if (!(info->serial_signals & SerialSignal_RTS))
3452 write_reg(info, CHA + MODE, val);
3456 * 07 PU Power Up, 1=active, 0=power down
3457 * 06 MCE Master Clock Enable, 1=enabled
3459 * 04..02 SC[2..0] Encoding, 000=NRZ
3460 * 01..00 SM[1..0] Serial Mode, 11=Async
3464 write_reg(info, CHA + CCR0, 0x83);
3468 * 07..05 Reserved, 0
3469 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3470 * 03 BCR Bit Clock Rate, 1=16x
3471 * 02..00 CM[2..0] Clock Mode, 111=BRG
3475 write_reg(info, CHA + CCR1, 0x1f);
3479 * 07..06 BGR[9..8] Baud rate bits 9..8
3480 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3481 * 04 SSEL Clock source select, 1=submode b
3482 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3483 * 02 RWX Read/Write Exchange 0=disabled
3485 * 00 DIV, data inversion 0=disabled, 1=enabled
3489 write_reg(info, CHA + CCR2, 0x10);
3493 * 07..01 Reserved, 0
3494 * 00 PSD DPLL Phase Shift Disable
3498 write_reg(info, CHA + CCR3, 0);
3502 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3503 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3504 * 05 TST1 Test Pin, 0=normal operation
3505 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3506 * 03..00 Reserved, must be 0
3510 write_reg(info, CHA + CCR4, 0x50);
3511 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3516 * 06 XBRK transmit break, 0=normal operation
3517 * 05 Stop bits (0=1, 1=2)
3518 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3519 * 02 PAREN Parity Enable
3520 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3524 if (info->params.data_bits != 8)
3525 val |= BIT0; /* 7 bits */
3526 if (info->params.stop_bits != 1)
3528 if (info->params.parity != ASYNC_PARITY_NONE)
3530 val |= BIT2; /* Parity enable */
3531 if (info->params.parity == ASYNC_PARITY_ODD)
3536 write_reg(info, CHA + DAFO, val);
3538 /* RFC Rx FIFO Control
3541 * 06 DPS, 1=parity bit not stored in data byte
3542 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3543 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3544 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3546 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3550 write_reg(info, CHA + RFC, 0x5c);
3552 /* RLCR Receive length check register
3554 * Max frame length = (RL + 1) * 32
3556 write_reg(info, CHA + RLCR, 0);
3558 /* XBCH Transmit Byte Count High
3560 * 07 DMA mode, 0 = interrupt driven
3561 * 06 NRM, 0=ABM (ignored)
3562 * 05 CAS Carrier Auto Start
3563 * 04 XC Transmit Continuously (ignored)
3564 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3569 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3571 write_reg(info, CHA + XBCH, val);
3572 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3573 irq_enable(info, CHA, IRQ_CTS);
3575 /* MODE:03 RAC Receiver Active, 1=active */
3576 set_reg_bits(info, CHA + MODE, BIT3);
3577 enable_auxclk(info);
3578 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3579 irq_enable(info, CHB, IRQ_CTS);
3580 /* PVR[3] 1=AUTO CTS active */
3581 set_reg_bits(info, CHA + PVR, BIT3);
3583 clear_reg_bits(info, CHA + PVR, BIT3);
3584 irq_enable(info, CHA,
3585 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3586 IRQ_ALLSENT + IRQ_TXFIFO);
3587 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3588 wait_command_complete(info, CHA);
3589 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3592 /* Set the HDLC idle mode for the transmitter.
3594 static void tx_set_idle(MGSLPC_INFO *info)
3596 /* Note: ESCC2 only supports flags and one idle modes */
3597 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3598 set_reg_bits(info, CHA + CCR1, BIT3);
3600 clear_reg_bits(info, CHA + CCR1, BIT3);
3603 /* get state of the V24 status (input) signals.
3605 static void get_signals(MGSLPC_INFO *info)
3607 unsigned char status = 0;
3609 /* preserve DTR and RTS */
3610 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3612 if (read_reg(info, CHB + VSTR) & BIT7)
3613 info->serial_signals |= SerialSignal_DCD;
3614 if (read_reg(info, CHB + STAR) & BIT1)
3615 info->serial_signals |= SerialSignal_CTS;
3617 status = read_reg(info, CHA + PVR);
3618 if (!(status & PVR_RI))
3619 info->serial_signals |= SerialSignal_RI;
3620 if (!(status & PVR_DSR))
3621 info->serial_signals |= SerialSignal_DSR;
3624 /* Set the state of DTR and RTS based on contents of
3625 * serial_signals member of device extension.
3627 static void set_signals(MGSLPC_INFO *info)
3631 val = read_reg(info, CHA + MODE);
3632 if (info->params.mode == MGSL_MODE_ASYNC) {
3633 if (info->serial_signals & SerialSignal_RTS)
3638 if (info->serial_signals & SerialSignal_RTS)
3643 write_reg(info, CHA + MODE, val);
3645 if (info->serial_signals & SerialSignal_DTR)
3646 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3648 set_reg_bits(info, CHA + PVR, PVR_DTR);
3651 static void rx_reset_buffers(MGSLPC_INFO *info)
3658 info->rx_frame_count = 0;
3659 for (i=0 ; i < info->rx_buf_count ; i++) {
3660 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3661 buf->status = buf->count = 0;
3665 /* Attempt to return a received HDLC frame
3666 * Only frames received without errors are returned.
3668 * Returns true if frame returned, otherwise false
3670 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3672 unsigned short status;
3674 unsigned int framesize = 0;
3675 unsigned long flags;
3676 bool return_frame = false;
3678 if (info->rx_frame_count == 0)
3681 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3683 status = buf->status;
3685 /* 07 VFR 1=valid frame
3686 * 06 RDO 1=data overrun
3687 * 05 CRC 1=OK, 0=error
3688 * 04 RAB 1=frame aborted
3690 if ((status & 0xf0) != 0xA0) {
3691 if (!(status & BIT7) || (status & BIT4))
3692 info->icount.rxabort++;
3693 else if (status & BIT6)
3694 info->icount.rxover++;
3695 else if (!(status & BIT5)) {
3696 info->icount.rxcrc++;
3697 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3698 return_frame = true;
3701 #if SYNCLINK_GENERIC_HDLC
3703 info->netdev->stats.rx_errors++;
3704 info->netdev->stats.rx_frame_errors++;
3708 return_frame = true;
3711 framesize = buf->count;
3713 if (debug_level >= DEBUG_LEVEL_BH)
3714 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3715 __FILE__, __LINE__, info->device_name, status, framesize);
3717 if (debug_level >= DEBUG_LEVEL_DATA)
3718 trace_block(info, buf->data, framesize, 0);
3721 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3722 framesize+1 > info->max_frame_size) ||
3723 framesize > info->max_frame_size)
3724 info->icount.rxlong++;
3727 info->icount.rxok++;
3729 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3730 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3734 #if SYNCLINK_GENERIC_HDLC
3736 hdlcdev_rx(info, buf->data, framesize);
3739 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3743 spin_lock_irqsave(&info->lock, flags);
3744 buf->status = buf->count = 0;
3745 info->rx_frame_count--;
3747 if (info->rx_get >= info->rx_buf_count)
3749 spin_unlock_irqrestore(&info->lock, flags);
3754 static bool register_test(MGSLPC_INFO *info)
3756 static unsigned char patterns[] =
3757 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3758 static unsigned int count = ARRAY_SIZE(patterns);
3761 unsigned long flags;
3763 spin_lock_irqsave(&info->lock, flags);
3766 for (i = 0; i < count; i++) {
3767 write_reg(info, XAD1, patterns[i]);
3768 write_reg(info, XAD2, patterns[(i + 1) % count]);
3769 if ((read_reg(info, XAD1) != patterns[i]) ||
3770 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3776 spin_unlock_irqrestore(&info->lock, flags);
3780 static bool irq_test(MGSLPC_INFO *info)
3782 unsigned long end_time;
3783 unsigned long flags;
3785 spin_lock_irqsave(&info->lock, flags);
3788 info->testing_irq = true;
3791 info->irq_occurred = false;
3793 /* init hdlc mode */
3795 irq_enable(info, CHA, IRQ_TIMER);
3796 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3797 issue_command(info, CHA, CMD_START_TIMER);
3799 spin_unlock_irqrestore(&info->lock, flags);
3802 while(end_time-- && !info->irq_occurred) {
3803 msleep_interruptible(10);
3806 info->testing_irq = false;
3808 spin_lock_irqsave(&info->lock, flags);
3810 spin_unlock_irqrestore(&info->lock, flags);
3812 return info->irq_occurred;
3815 static int adapter_test(MGSLPC_INFO *info)
3817 if (!register_test(info)) {
3818 info->init_error = DiagStatus_AddressFailure;
3819 printk("%s(%d):Register test failure for device %s Addr=%04X\n",
3820 __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base));
3824 if (!irq_test(info)) {
3825 info->init_error = DiagStatus_IrqFailure;
3826 printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3827 __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level));
3831 if (debug_level >= DEBUG_LEVEL_INFO)
3832 printk("%s(%d):device %s passed diagnostics\n",
3833 __FILE__, __LINE__, info->device_name);
3837 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3842 printk("%s tx data:\n", info->device_name);
3844 printk("%s rx data:\n", info->device_name);
3852 for(i=0;i<linecount;i++)
3853 printk("%02X ", (unsigned char)data[i]);
3856 for(i=0;i<linecount;i++) {
3857 if (data[i]>=040 && data[i]<=0176)
3858 printk("%c", data[i]);
3869 /* HDLC frame time out
3870 * update stats and do tx completion processing
3872 static void tx_timeout(unsigned long context)
3874 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3875 unsigned long flags;
3877 if (debug_level >= DEBUG_LEVEL_INFO)
3878 printk("%s(%d):tx_timeout(%s)\n",
3879 __FILE__, __LINE__, info->device_name);
3880 if (info->tx_active &&
3881 info->params.mode == MGSL_MODE_HDLC) {
3882 info->icount.txtimeout++;
3884 spin_lock_irqsave(&info->lock, flags);
3885 info->tx_active = false;
3886 info->tx_count = info->tx_put = info->tx_get = 0;
3888 spin_unlock_irqrestore(&info->lock, flags);
3890 #if SYNCLINK_GENERIC_HDLC
3892 hdlcdev_tx_done(info);
3896 struct tty_struct *tty = tty_port_tty_get(&info->port);
3897 bh_transmit(info, tty);
3902 #if SYNCLINK_GENERIC_HDLC
3905 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3906 * set encoding and frame check sequence (FCS) options
3908 * dev pointer to network device structure
3909 * encoding serial encoding setting
3910 * parity FCS setting
3912 * returns 0 if success, otherwise error code
3914 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3915 unsigned short parity)
3917 MGSLPC_INFO *info = dev_to_port(dev);
3918 struct tty_struct *tty;
3919 unsigned char new_encoding;
3920 unsigned short new_crctype;
3922 /* return error if TTY interface open */
3923 if (info->port.count)
3928 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3929 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3930 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3931 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3932 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3933 default: return -EINVAL;
3938 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3939 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3940 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3941 default: return -EINVAL;
3944 info->params.encoding = new_encoding;
3945 info->params.crc_type = new_crctype;
3947 /* if network interface up, reprogram hardware */
3948 if (info->netcount) {
3949 tty = tty_port_tty_get(&info->port);
3950 mgslpc_program_hw(info, tty);
3958 * called by generic HDLC layer to send frame
3960 * skb socket buffer containing HDLC frame
3961 * dev pointer to network device structure
3963 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3964 struct net_device *dev)
3966 MGSLPC_INFO *info = dev_to_port(dev);
3967 unsigned long flags;
3969 if (debug_level >= DEBUG_LEVEL_INFO)
3970 printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name);
3972 /* stop sending until this frame completes */
3973 netif_stop_queue(dev);
3975 /* copy data to device buffers */
3976 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3978 info->tx_put = info->tx_count = skb->len;
3980 /* update network statistics */
3981 dev->stats.tx_packets++;
3982 dev->stats.tx_bytes += skb->len;
3984 /* done with socket buffer, so free it */
3987 /* save start time for transmit timeout detection */
3988 dev->trans_start = jiffies;
3990 /* start hardware transmitter if necessary */
3991 spin_lock_irqsave(&info->lock, flags);
3992 if (!info->tx_active) {
3993 struct tty_struct *tty = tty_port_tty_get(&info->port);
3994 tx_start(info, tty);
3997 spin_unlock_irqrestore(&info->lock, flags);
3999 return NETDEV_TX_OK;
4003 * called by network layer when interface enabled
4004 * claim resources and initialize hardware
4006 * dev pointer to network device structure
4008 * returns 0 if success, otherwise error code
4010 static int hdlcdev_open(struct net_device *dev)
4012 MGSLPC_INFO *info = dev_to_port(dev);
4013 struct tty_struct *tty;
4015 unsigned long flags;
4017 if (debug_level >= DEBUG_LEVEL_INFO)
4018 printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name);
4020 /* generic HDLC layer open processing */
4021 rc = hdlc_open(dev);
4025 /* arbitrate between network and tty opens */
4026 spin_lock_irqsave(&info->netlock, flags);
4027 if (info->port.count != 0 || info->netcount != 0) {
4028 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4029 spin_unlock_irqrestore(&info->netlock, flags);
4033 spin_unlock_irqrestore(&info->netlock, flags);
4035 tty = tty_port_tty_get(&info->port);
4036 /* claim resources and init adapter */
4037 rc = startup(info, tty);
4040 spin_lock_irqsave(&info->netlock, flags);
4042 spin_unlock_irqrestore(&info->netlock, flags);
4045 /* assert DTR and RTS, apply hardware settings */
4046 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4047 mgslpc_program_hw(info, tty);
4050 /* enable network layer transmit */
4051 dev->trans_start = jiffies;
4052 netif_start_queue(dev);
4054 /* inform generic HDLC layer of current DCD status */
4055 spin_lock_irqsave(&info->lock, flags);
4057 spin_unlock_irqrestore(&info->lock, flags);
4058 if (info->serial_signals & SerialSignal_DCD)
4059 netif_carrier_on(dev);
4061 netif_carrier_off(dev);
4066 * called by network layer when interface is disabled
4067 * shutdown hardware and release resources
4069 * dev pointer to network device structure
4071 * returns 0 if success, otherwise error code
4073 static int hdlcdev_close(struct net_device *dev)
4075 MGSLPC_INFO *info = dev_to_port(dev);
4076 struct tty_struct *tty = tty_port_tty_get(&info->port);
4077 unsigned long flags;
4079 if (debug_level >= DEBUG_LEVEL_INFO)
4080 printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name);
4082 netif_stop_queue(dev);
4084 /* shutdown adapter and release resources */
4085 shutdown(info, tty);
4089 spin_lock_irqsave(&info->netlock, flags);
4091 spin_unlock_irqrestore(&info->netlock, flags);
4097 * called by network layer to process IOCTL call to network device
4099 * dev pointer to network device structure
4100 * ifr pointer to network interface request structure
4101 * cmd IOCTL command code
4103 * returns 0 if success, otherwise error code
4105 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4107 const size_t size = sizeof(sync_serial_settings);
4108 sync_serial_settings new_line;
4109 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4110 MGSLPC_INFO *info = dev_to_port(dev);
4113 if (debug_level >= DEBUG_LEVEL_INFO)
4114 printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name);
4116 /* return error if TTY interface open */
4117 if (info->port.count)
4120 if (cmd != SIOCWANDEV)
4121 return hdlc_ioctl(dev, ifr, cmd);
4123 memset(&new_line, 0, size);
4125 switch(ifr->ifr_settings.type) {
4126 case IF_GET_IFACE: /* return current sync_serial_settings */
4128 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4129 if (ifr->ifr_settings.size < size) {
4130 ifr->ifr_settings.size = size; /* data size wanted */
4134 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4135 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4136 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4137 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4140 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4141 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4142 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4143 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4144 default: new_line.clock_type = CLOCK_DEFAULT;
4147 new_line.clock_rate = info->params.clock_speed;
4148 new_line.loopback = info->params.loopback ? 1:0;
4150 if (copy_to_user(line, &new_line, size))
4154 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4156 if(!capable(CAP_NET_ADMIN))
4158 if (copy_from_user(&new_line, line, size))
4161 switch (new_line.clock_type)
4163 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4164 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4165 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4166 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4167 case CLOCK_DEFAULT: flags = info->params.flags &
4168 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4169 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4170 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4171 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4172 default: return -EINVAL;
4175 if (new_line.loopback != 0 && new_line.loopback != 1)
4178 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4179 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4180 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4181 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4182 info->params.flags |= flags;
4184 info->params.loopback = new_line.loopback;
4186 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4187 info->params.clock_speed = new_line.clock_rate;
4189 info->params.clock_speed = 0;
4191 /* if network interface up, reprogram hardware */
4192 if (info->netcount) {
4193 struct tty_struct *tty = tty_port_tty_get(&info->port);
4194 mgslpc_program_hw(info, tty);
4200 return hdlc_ioctl(dev, ifr, cmd);
4205 * called by network layer when transmit timeout is detected
4207 * dev pointer to network device structure
4209 static void hdlcdev_tx_timeout(struct net_device *dev)
4211 MGSLPC_INFO *info = dev_to_port(dev);
4212 unsigned long flags;
4214 if (debug_level >= DEBUG_LEVEL_INFO)
4215 printk("hdlcdev_tx_timeout(%s)\n", dev->name);
4217 dev->stats.tx_errors++;
4218 dev->stats.tx_aborted_errors++;
4220 spin_lock_irqsave(&info->lock, flags);
4222 spin_unlock_irqrestore(&info->lock, flags);
4224 netif_wake_queue(dev);
4228 * called by device driver when transmit completes
4229 * reenable network layer transmit if stopped
4231 * info pointer to device instance information
4233 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4235 if (netif_queue_stopped(info->netdev))
4236 netif_wake_queue(info->netdev);
4240 * called by device driver when frame received
4241 * pass frame to network layer
4243 * info pointer to device instance information
4244 * buf pointer to buffer contianing frame data
4245 * size count of data bytes in buf
4247 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4249 struct sk_buff *skb = dev_alloc_skb(size);
4250 struct net_device *dev = info->netdev;
4252 if (debug_level >= DEBUG_LEVEL_INFO)
4253 printk("hdlcdev_rx(%s)\n", dev->name);
4256 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4257 dev->stats.rx_dropped++;
4261 memcpy(skb_put(skb, size), buf, size);
4263 skb->protocol = hdlc_type_trans(skb, dev);
4265 dev->stats.rx_packets++;
4266 dev->stats.rx_bytes += size;
4271 static const struct net_device_ops hdlcdev_ops = {
4272 .ndo_open = hdlcdev_open,
4273 .ndo_stop = hdlcdev_close,
4274 .ndo_change_mtu = hdlc_change_mtu,
4275 .ndo_start_xmit = hdlc_start_xmit,
4276 .ndo_do_ioctl = hdlcdev_ioctl,
4277 .ndo_tx_timeout = hdlcdev_tx_timeout,
4281 * called by device driver when adding device instance
4282 * do generic HDLC initialization
4284 * info pointer to device instance information
4286 * returns 0 if success, otherwise error code
4288 static int hdlcdev_init(MGSLPC_INFO *info)
4291 struct net_device *dev;
4294 /* allocate and initialize network and HDLC layer objects */
4296 dev = alloc_hdlcdev(info);
4298 printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__);
4302 /* for network layer reporting purposes only */
4303 dev->base_addr = info->io_base;
4304 dev->irq = info->irq_level;
4306 /* network layer callbacks and settings */
4307 dev->netdev_ops = &hdlcdev_ops;
4308 dev->watchdog_timeo = 10 * HZ;
4309 dev->tx_queue_len = 50;
4311 /* generic HDLC layer callbacks and settings */
4312 hdlc = dev_to_hdlc(dev);
4313 hdlc->attach = hdlcdev_attach;
4314 hdlc->xmit = hdlcdev_xmit;
4316 /* register objects with HDLC layer */
4317 rc = register_hdlc_device(dev);
4319 printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__);
4329 * called by device driver when removing device instance
4330 * do generic HDLC cleanup
4332 * info pointer to device instance information
4334 static void hdlcdev_exit(MGSLPC_INFO *info)
4336 unregister_hdlc_device(info->netdev);
4337 free_netdev(info->netdev);
4338 info->netdev = NULL;
4341 #endif /* CONFIG_HDLC */