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; */
108 unsigned char status;
112 /* The queue of BH actions to be performed */
115 #define BH_TRANSMIT 2
118 #define IO_PIN_SHUTDOWN_LIMIT 100
120 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
122 struct _input_signal_events {
135 * Device instance data structure
138 typedef struct _mgslpc_info {
139 struct tty_port port;
140 void *if_ptr; /* General purpose pointer (used by SPPP) */
144 struct mgsl_icount icount;
147 int x_char; /* xon/xoff character */
148 unsigned char read_status_mask;
149 unsigned char ignore_status_mask;
151 unsigned char *tx_buf;
156 /* circular list of fixed length rx buffers */
158 unsigned char *rx_buf; /* memory allocated for all rx buffers */
159 int rx_buf_total_size; /* size of memory allocated for rx buffers */
160 int rx_put; /* index of next empty rx buffer */
161 int rx_get; /* index of next full rx buffer */
162 int rx_buf_size; /* size in bytes of single rx buffer */
163 int rx_buf_count; /* total number of rx buffers */
164 int rx_frame_count; /* number of full rx buffers */
166 wait_queue_head_t status_event_wait_q;
167 wait_queue_head_t event_wait_q;
168 struct timer_list tx_timer; /* HDLC transmit timeout timer */
169 struct _mgslpc_info *next_device; /* device list link */
171 unsigned short imra_value;
172 unsigned short imrb_value;
173 unsigned char pim_value;
176 struct work_struct task; /* task structure for scheduling bh */
185 int dcd_chkcount; /* check counts to prevent */
186 int cts_chkcount; /* too many IRQs if a signal */
187 int dsr_chkcount; /* is floating */
198 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
200 char device_name[25]; /* device instance name */
202 unsigned int io_base; /* base I/O address of adapter */
203 unsigned int irq_level;
205 MGSL_PARAMS params; /* communications parameters */
207 unsigned char serial_signals; /* current serial signal states */
209 bool irq_occurred; /* for diagnostics use */
211 unsigned int init_error; /* startup error (DIAGS) */
214 bool drop_rts_on_tx_done;
216 struct _input_signal_events input_signal_events;
219 struct pcmcia_device *p_dev;
222 /* SPPP/Cisco HDLC device parts */
226 #if SYNCLINK_GENERIC_HDLC
227 struct net_device *netdev;
232 #define MGSLPC_MAGIC 0x5402
235 * The size of the serial xmit buffer is 1 page, or 4096 bytes
237 #define TXBUFSIZE 4096
240 #define CHA 0x00 /* channel A offset */
241 #define CHB 0x40 /* channel B offset */
244 * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
291 #define IRQ_BREAK_ON BIT15 // rx break detected
292 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
293 #define IRQ_ALLSENT BIT13 // all sent
294 #define IRQ_UNDERRUN BIT12 // transmit data underrun
295 #define IRQ_TIMER BIT11 // timer interrupt
296 #define IRQ_CTS BIT10 // CTS status change
297 #define IRQ_TXREPEAT BIT9 // tx message repeat
298 #define IRQ_TXFIFO BIT8 // transmit pool ready
299 #define IRQ_RXEOM BIT7 // receive message end
300 #define IRQ_EXITHUNT BIT6 // receive frame start
301 #define IRQ_RXTIME BIT6 // rx char timeout
302 #define IRQ_DCD BIT2 // carrier detect status change
303 #define IRQ_OVERRUN BIT1 // receive frame overflow
304 #define IRQ_RXFIFO BIT0 // receive pool full
308 #define XFW BIT6 // transmit FIFO write enable
309 #define CEC BIT2 // command executing
310 #define CTS BIT1 // CTS state
315 #define PVR_AUTOCTS BIT3
316 #define PVR_RS232 0x20 /* 0010b */
317 #define PVR_V35 0xe0 /* 1110b */
318 #define PVR_RS422 0x40 /* 0100b */
320 /* Register access functions */
322 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
323 #define read_reg(info, reg) inb((info)->io_base + (reg))
325 #define read_reg16(info, reg) inw((info)->io_base + (reg))
326 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
328 #define set_reg_bits(info, reg, mask) \
329 write_reg(info, (reg), \
330 (unsigned char) (read_reg(info, (reg)) | (mask)))
331 #define clear_reg_bits(info, reg, mask) \
332 write_reg(info, (reg), \
333 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
335 * interrupt enable/disable routines
337 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
339 if (channel == CHA) {
340 info->imra_value |= mask;
341 write_reg16(info, CHA + IMR, info->imra_value);
343 info->imrb_value |= mask;
344 write_reg16(info, CHB + IMR, info->imrb_value);
347 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
349 if (channel == CHA) {
350 info->imra_value &= ~mask;
351 write_reg16(info, CHA + IMR, info->imra_value);
353 info->imrb_value &= ~mask;
354 write_reg16(info, CHB + IMR, info->imrb_value);
358 #define port_irq_disable(info, mask) \
359 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
361 #define port_irq_enable(info, mask) \
362 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
364 static void rx_start(MGSLPC_INFO *info);
365 static void rx_stop(MGSLPC_INFO *info);
367 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
368 static void tx_stop(MGSLPC_INFO *info);
369 static void tx_set_idle(MGSLPC_INFO *info);
371 static void get_signals(MGSLPC_INFO *info);
372 static void set_signals(MGSLPC_INFO *info);
374 static void reset_device(MGSLPC_INFO *info);
376 static void hdlc_mode(MGSLPC_INFO *info);
377 static void async_mode(MGSLPC_INFO *info);
379 static void tx_timeout(unsigned long context);
381 static int carrier_raised(struct tty_port *port);
382 static void dtr_rts(struct tty_port *port, int onoff);
384 #if SYNCLINK_GENERIC_HDLC
385 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
386 static void hdlcdev_tx_done(MGSLPC_INFO *info);
387 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
388 static int hdlcdev_init(MGSLPC_INFO *info);
389 static void hdlcdev_exit(MGSLPC_INFO *info);
392 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
394 static bool register_test(MGSLPC_INFO *info);
395 static bool irq_test(MGSLPC_INFO *info);
396 static int adapter_test(MGSLPC_INFO *info);
398 static int claim_resources(MGSLPC_INFO *info);
399 static void release_resources(MGSLPC_INFO *info);
400 static void mgslpc_add_device(MGSLPC_INFO *info);
401 static void mgslpc_remove_device(MGSLPC_INFO *info);
403 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
404 static void rx_reset_buffers(MGSLPC_INFO *info);
405 static int rx_alloc_buffers(MGSLPC_INFO *info);
406 static void rx_free_buffers(MGSLPC_INFO *info);
408 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
411 * Bottom half interrupt handlers
413 static void bh_handler(struct work_struct *work);
414 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
415 static void bh_status(MGSLPC_INFO *info);
420 static int tiocmget(struct tty_struct *tty);
421 static int tiocmset(struct tty_struct *tty,
422 unsigned int set, unsigned int clear);
423 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
424 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
425 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
426 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
427 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
428 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
429 static int tx_abort(MGSLPC_INFO *info);
430 static int set_rxenable(MGSLPC_INFO *info, int enable);
431 static int wait_events(MGSLPC_INFO *info, int __user *mask);
433 static MGSLPC_INFO *mgslpc_device_list = NULL;
434 static int mgslpc_device_count = 0;
437 * Set this param to non-zero to load eax with the
438 * .text section address and breakpoint on module load.
439 * This is useful for use with gdb and add-symbol-file command.
441 static bool break_on_load=0;
444 * Driver major number, defaults to zero to get auto
445 * assigned major number. May be forced as module parameter.
447 static int ttymajor=0;
449 static int debug_level = 0;
450 static int maxframe[MAX_DEVICE_COUNT] = {0,};
452 module_param(break_on_load, bool, 0);
453 module_param(ttymajor, int, 0);
454 module_param(debug_level, int, 0);
455 module_param_array(maxframe, int, NULL, 0);
457 MODULE_LICENSE("GPL");
459 static char *driver_name = "SyncLink PC Card driver";
460 static char *driver_version = "$Revision: 4.34 $";
462 static struct tty_driver *serial_driver;
464 /* number of characters left in xmit buffer before we ask for more */
465 #define WAKEUP_CHARS 256
467 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
468 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
470 /* PCMCIA prototypes */
472 static int mgslpc_config(struct pcmcia_device *link);
473 static void mgslpc_release(u_long arg);
474 static void mgslpc_detach(struct pcmcia_device *p_dev);
477 * 1st function defined in .text section. Calling this function in
478 * init_module() followed by a breakpoint allows a remote debugger
479 * (gdb) to get the .text address for the add-symbol-file command.
480 * This allows remote debugging of dynamically loadable modules.
482 static void* mgslpc_get_text_ptr(void)
484 return mgslpc_get_text_ptr;
488 * line discipline callback wrappers
490 * The wrappers maintain line discipline references
491 * while calling into the line discipline.
493 * ldisc_receive_buf - pass receive data to line discipline
496 static void ldisc_receive_buf(struct tty_struct *tty,
497 const __u8 *data, char *flags, int count)
499 struct tty_ldisc *ld;
502 ld = tty_ldisc_ref(tty);
504 if (ld->ops->receive_buf)
505 ld->ops->receive_buf(tty, data, flags, count);
510 static const struct tty_port_operations mgslpc_port_ops = {
511 .carrier_raised = carrier_raised,
515 static int mgslpc_probe(struct pcmcia_device *link)
520 if (debug_level >= DEBUG_LEVEL_INFO)
521 printk("mgslpc_attach\n");
523 info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
525 printk("Error can't allocate device instance data\n");
529 info->magic = MGSLPC_MAGIC;
530 tty_port_init(&info->port);
531 info->port.ops = &mgslpc_port_ops;
532 INIT_WORK(&info->task, bh_handler);
533 info->max_frame_size = 4096;
534 info->port.close_delay = 5*HZ/10;
535 info->port.closing_wait = 30*HZ;
536 init_waitqueue_head(&info->status_event_wait_q);
537 init_waitqueue_head(&info->event_wait_q);
538 spin_lock_init(&info->lock);
539 spin_lock_init(&info->netlock);
540 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
541 info->idle_mode = HDLC_TXIDLE_FLAGS;
542 info->imra_value = 0xffff;
543 info->imrb_value = 0xffff;
544 info->pim_value = 0xff;
549 /* Initialize the struct pcmcia_device structure */
551 ret = mgslpc_config(link);
553 tty_port_destroy(&info->port);
557 mgslpc_add_device(info);
562 /* Card has been inserted.
565 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
567 return pcmcia_request_io(p_dev);
570 static int mgslpc_config(struct pcmcia_device *link)
572 MGSLPC_INFO *info = link->priv;
575 if (debug_level >= DEBUG_LEVEL_INFO)
576 printk("mgslpc_config(0x%p)\n", link);
578 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
580 ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
584 link->config_index = 8;
585 link->config_regs = PRESENT_OPTION;
587 ret = pcmcia_request_irq(link, mgslpc_isr);
590 ret = pcmcia_enable_device(link);
594 info->io_base = link->resource[0]->start;
595 info->irq_level = link->irq;
599 mgslpc_release((u_long)link);
603 /* Card has been removed.
604 * Unregister device and release PCMCIA configuration.
605 * If device is open, postpone until it is closed.
607 static void mgslpc_release(u_long arg)
609 struct pcmcia_device *link = (struct pcmcia_device *)arg;
611 if (debug_level >= DEBUG_LEVEL_INFO)
612 printk("mgslpc_release(0x%p)\n", link);
614 pcmcia_disable_device(link);
617 static void mgslpc_detach(struct pcmcia_device *link)
619 if (debug_level >= DEBUG_LEVEL_INFO)
620 printk("mgslpc_detach(0x%p)\n", link);
622 ((MGSLPC_INFO *)link->priv)->stop = 1;
623 mgslpc_release((u_long)link);
625 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
628 static int mgslpc_suspend(struct pcmcia_device *link)
630 MGSLPC_INFO *info = link->priv;
637 static int mgslpc_resume(struct pcmcia_device *link)
639 MGSLPC_INFO *info = link->priv;
647 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
648 char *name, const char *routine)
650 #ifdef MGSLPC_PARANOIA_CHECK
651 static const char *badmagic =
652 "Warning: bad magic number for mgsl struct (%s) in %s\n";
653 static const char *badinfo =
654 "Warning: null mgslpc_info for (%s) in %s\n";
657 printk(badinfo, name, routine);
660 if (info->magic != MGSLPC_MAGIC) {
661 printk(badmagic, name, routine);
672 #define CMD_RXFIFO BIT7 // release current rx FIFO
673 #define CMD_RXRESET BIT6 // receiver reset
674 #define CMD_RXFIFO_READ BIT5
675 #define CMD_START_TIMER BIT4
676 #define CMD_TXFIFO BIT3 // release current tx FIFO
677 #define CMD_TXEOM BIT1 // transmit end message
678 #define CMD_TXRESET BIT0 // transmit reset
680 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
683 /* wait for command completion */
684 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
692 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
694 wait_command_complete(info, channel);
695 write_reg(info, (unsigned char) (channel + CMDR), cmd);
698 static void tx_pause(struct tty_struct *tty)
700 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
703 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
705 if (debug_level >= DEBUG_LEVEL_INFO)
706 printk("tx_pause(%s)\n",info->device_name);
708 spin_lock_irqsave(&info->lock,flags);
709 if (info->tx_enabled)
711 spin_unlock_irqrestore(&info->lock,flags);
714 static void tx_release(struct tty_struct *tty)
716 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
719 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
721 if (debug_level >= DEBUG_LEVEL_INFO)
722 printk("tx_release(%s)\n",info->device_name);
724 spin_lock_irqsave(&info->lock,flags);
725 if (!info->tx_enabled)
727 spin_unlock_irqrestore(&info->lock,flags);
730 /* Return next bottom half action to perform.
731 * or 0 if nothing to do.
733 static int bh_action(MGSLPC_INFO *info)
738 spin_lock_irqsave(&info->lock,flags);
740 if (info->pending_bh & BH_RECEIVE) {
741 info->pending_bh &= ~BH_RECEIVE;
743 } else if (info->pending_bh & BH_TRANSMIT) {
744 info->pending_bh &= ~BH_TRANSMIT;
746 } else if (info->pending_bh & BH_STATUS) {
747 info->pending_bh &= ~BH_STATUS;
752 /* Mark BH routine as complete */
753 info->bh_running = false;
754 info->bh_requested = false;
757 spin_unlock_irqrestore(&info->lock,flags);
762 static void bh_handler(struct work_struct *work)
764 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
765 struct tty_struct *tty;
768 if (debug_level >= DEBUG_LEVEL_BH)
769 printk( "%s(%d):bh_handler(%s) entry\n",
770 __FILE__,__LINE__,info->device_name);
772 info->bh_running = true;
773 tty = tty_port_tty_get(&info->port);
775 while((action = bh_action(info)) != 0) {
777 /* Process work item */
778 if ( debug_level >= DEBUG_LEVEL_BH )
779 printk( "%s(%d):bh_handler() work item action=%d\n",
780 __FILE__,__LINE__,action);
785 while(rx_get_frame(info, tty));
788 bh_transmit(info, tty);
794 /* unknown work item ID */
795 printk("Unknown work item ID=%08X!\n", action);
801 if (debug_level >= DEBUG_LEVEL_BH)
802 printk( "%s(%d):bh_handler(%s) exit\n",
803 __FILE__,__LINE__,info->device_name);
806 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
808 if (debug_level >= DEBUG_LEVEL_BH)
809 printk("bh_transmit() entry on %s\n", info->device_name);
815 static void bh_status(MGSLPC_INFO *info)
817 info->ri_chkcount = 0;
818 info->dsr_chkcount = 0;
819 info->dcd_chkcount = 0;
820 info->cts_chkcount = 0;
823 /* eom: non-zero = end of frame */
824 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
826 unsigned char data[2];
827 unsigned char fifo_count, read_count, i;
828 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
830 if (debug_level >= DEBUG_LEVEL_ISR)
831 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
833 if (!info->rx_enabled)
836 if (info->rx_frame_count >= info->rx_buf_count) {
837 /* no more free buffers */
838 issue_command(info, CHA, CMD_RXRESET);
839 info->pending_bh |= BH_RECEIVE;
840 info->rx_overflow = true;
841 info->icount.buf_overrun++;
846 /* end of frame, get FIFO count from RBCL register */
847 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
853 if (fifo_count == 1) {
855 data[0] = read_reg(info, CHA + RXFIFO);
858 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
860 fifo_count -= read_count;
861 if (!fifo_count && eom)
862 buf->status = data[--read_count];
864 for (i = 0; i < read_count; i++) {
865 if (buf->count >= info->max_frame_size) {
866 /* frame too large, reset receiver and reset current buffer */
867 issue_command(info, CHA, CMD_RXRESET);
871 *(buf->data + buf->count) = data[i];
874 } while (fifo_count);
877 info->pending_bh |= BH_RECEIVE;
878 info->rx_frame_count++;
880 if (info->rx_put >= info->rx_buf_count)
883 issue_command(info, CHA, CMD_RXFIFO);
886 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
888 struct tty_port *port = &info->port;
889 unsigned char data, status, flag;
892 struct mgsl_icount *icount = &info->icount;
895 /* early termination, get FIFO count from RBCL register */
896 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
898 /* Zero fifo count could mean 0 or 32 bytes available.
899 * If BIT5 of STAR is set then at least 1 byte is available.
901 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
906 tty_buffer_request_room(port, fifo_count);
907 /* Flush received async data to receive data buffer. */
909 data = read_reg(info, CHA + RXFIFO);
910 status = read_reg(info, CHA + RXFIFO);
916 // if no frameing/crc error then save data
918 // BIT6:framing error
920 if (status & (BIT7 + BIT6)) {
926 /* discard char if tty control flags say so */
927 if (status & info->ignore_status_mask)
930 status &= info->read_status_mask;
934 else if (status & BIT6)
937 work += tty_insert_flip_char(port, data, flag);
939 issue_command(info, CHA, CMD_RXFIFO);
941 if (debug_level >= DEBUG_LEVEL_ISR) {
942 printk("%s(%d):rx_ready_async",
944 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
945 __FILE__,__LINE__,icount->rx,icount->brk,
946 icount->parity,icount->frame,icount->overrun);
950 tty_flip_buffer_push(port);
954 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
956 if (!info->tx_active)
959 info->tx_active = false;
960 info->tx_aborting = false;
962 if (info->params.mode == MGSL_MODE_ASYNC)
965 info->tx_count = info->tx_put = info->tx_get = 0;
966 del_timer(&info->tx_timer);
968 if (info->drop_rts_on_tx_done) {
970 if (info->serial_signals & SerialSignal_RTS) {
971 info->serial_signals &= ~SerialSignal_RTS;
974 info->drop_rts_on_tx_done = false;
977 #if SYNCLINK_GENERIC_HDLC
979 hdlcdev_tx_done(info);
983 if (tty && (tty->stopped || tty->hw_stopped)) {
987 info->pending_bh |= BH_TRANSMIT;
991 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
993 unsigned char fifo_count = 32;
996 if (debug_level >= DEBUG_LEVEL_ISR)
997 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
999 if (info->params.mode == MGSL_MODE_HDLC) {
1000 if (!info->tx_active)
1003 if (tty && (tty->stopped || tty->hw_stopped)) {
1007 if (!info->tx_count)
1008 info->tx_active = false;
1011 if (!info->tx_count)
1014 while (info->tx_count && fifo_count) {
1015 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1018 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1020 write_reg16(info, CHA + TXFIFO,
1021 *((unsigned short*)(info->tx_buf + info->tx_get)));
1023 info->tx_count -= c;
1024 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1028 if (info->params.mode == MGSL_MODE_ASYNC) {
1029 if (info->tx_count < WAKEUP_CHARS)
1030 info->pending_bh |= BH_TRANSMIT;
1031 issue_command(info, CHA, CMD_TXFIFO);
1034 issue_command(info, CHA, CMD_TXFIFO);
1036 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1040 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1043 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1044 irq_disable(info, CHB, IRQ_CTS);
1046 if (info->serial_signals & SerialSignal_CTS)
1047 info->input_signal_events.cts_up++;
1049 info->input_signal_events.cts_down++;
1050 wake_up_interruptible(&info->status_event_wait_q);
1051 wake_up_interruptible(&info->event_wait_q);
1053 if (tty && tty_port_cts_enabled(&info->port)) {
1054 if (tty->hw_stopped) {
1055 if (info->serial_signals & SerialSignal_CTS) {
1056 if (debug_level >= DEBUG_LEVEL_ISR)
1057 printk("CTS tx start...");
1058 tty->hw_stopped = 0;
1059 tx_start(info, tty);
1060 info->pending_bh |= BH_TRANSMIT;
1064 if (!(info->serial_signals & SerialSignal_CTS)) {
1065 if (debug_level >= DEBUG_LEVEL_ISR)
1066 printk("CTS tx stop...");
1067 tty->hw_stopped = 1;
1072 info->pending_bh |= BH_STATUS;
1075 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1078 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1079 irq_disable(info, CHB, IRQ_DCD);
1081 if (info->serial_signals & SerialSignal_DCD) {
1082 info->input_signal_events.dcd_up++;
1085 info->input_signal_events.dcd_down++;
1086 #if SYNCLINK_GENERIC_HDLC
1087 if (info->netcount) {
1088 if (info->serial_signals & SerialSignal_DCD)
1089 netif_carrier_on(info->netdev);
1091 netif_carrier_off(info->netdev);
1094 wake_up_interruptible(&info->status_event_wait_q);
1095 wake_up_interruptible(&info->event_wait_q);
1097 if (info->port.flags & ASYNC_CHECK_CD) {
1098 if (debug_level >= DEBUG_LEVEL_ISR)
1099 printk("%s CD now %s...", info->device_name,
1100 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1101 if (info->serial_signals & SerialSignal_DCD)
1102 wake_up_interruptible(&info->port.open_wait);
1104 if (debug_level >= DEBUG_LEVEL_ISR)
1105 printk("doing serial hangup...");
1110 info->pending_bh |= BH_STATUS;
1113 static void dsr_change(MGSLPC_INFO *info)
1116 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1117 port_irq_disable(info, PVR_DSR);
1119 if (info->serial_signals & SerialSignal_DSR)
1120 info->input_signal_events.dsr_up++;
1122 info->input_signal_events.dsr_down++;
1123 wake_up_interruptible(&info->status_event_wait_q);
1124 wake_up_interruptible(&info->event_wait_q);
1125 info->pending_bh |= BH_STATUS;
1128 static void ri_change(MGSLPC_INFO *info)
1131 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1132 port_irq_disable(info, PVR_RI);
1134 if (info->serial_signals & SerialSignal_RI)
1135 info->input_signal_events.ri_up++;
1137 info->input_signal_events.ri_down++;
1138 wake_up_interruptible(&info->status_event_wait_q);
1139 wake_up_interruptible(&info->event_wait_q);
1140 info->pending_bh |= BH_STATUS;
1143 /* Interrupt service routine entry point.
1147 * irq interrupt number that caused interrupt
1148 * dev_id device ID supplied during interrupt registration
1150 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1152 MGSLPC_INFO *info = dev_id;
1153 struct tty_struct *tty;
1155 unsigned char gis, pis;
1158 if (debug_level >= DEBUG_LEVEL_ISR)
1159 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1161 if (!(info->p_dev->_locked))
1164 tty = tty_port_tty_get(&info->port);
1166 spin_lock(&info->lock);
1168 while ((gis = read_reg(info, CHA + GIS))) {
1169 if (debug_level >= DEBUG_LEVEL_ISR)
1170 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1172 if ((gis & 0x70) || count > 1000) {
1173 printk("synclink_cs:hardware failed or ejected\n");
1178 if (gis & (BIT1 + BIT0)) {
1179 isr = read_reg16(info, CHB + ISR);
1181 dcd_change(info, tty);
1183 cts_change(info, tty);
1185 if (gis & (BIT3 + BIT2))
1187 isr = read_reg16(info, CHA + ISR);
1188 if (isr & IRQ_TIMER) {
1189 info->irq_occurred = true;
1190 irq_disable(info, CHA, IRQ_TIMER);
1194 if (isr & IRQ_EXITHUNT) {
1195 info->icount.exithunt++;
1196 wake_up_interruptible(&info->event_wait_q);
1198 if (isr & IRQ_BREAK_ON) {
1200 if (info->port.flags & ASYNC_SAK)
1203 if (isr & IRQ_RXTIME) {
1204 issue_command(info, CHA, CMD_RXFIFO_READ);
1206 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1207 if (info->params.mode == MGSL_MODE_HDLC)
1208 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1210 rx_ready_async(info, isr & IRQ_RXEOM);
1214 if (isr & IRQ_UNDERRUN) {
1215 if (info->tx_aborting)
1216 info->icount.txabort++;
1218 info->icount.txunder++;
1221 else if (isr & IRQ_ALLSENT) {
1222 info->icount.txok++;
1225 else if (isr & IRQ_TXFIFO)
1226 tx_ready(info, tty);
1229 pis = read_reg(info, CHA + PIS);
1237 /* Request bottom half processing if there's something
1238 * for it to do and the bh is not already running
1241 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1242 if ( debug_level >= DEBUG_LEVEL_ISR )
1243 printk("%s(%d):%s queueing bh task.\n",
1244 __FILE__,__LINE__,info->device_name);
1245 schedule_work(&info->task);
1246 info->bh_requested = true;
1249 spin_unlock(&info->lock);
1252 if (debug_level >= DEBUG_LEVEL_ISR)
1253 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1254 __FILE__, __LINE__, info->irq_level);
1259 /* Initialize and start device.
1261 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1265 if (debug_level >= DEBUG_LEVEL_INFO)
1266 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1268 if (info->port.flags & ASYNC_INITIALIZED)
1271 if (!info->tx_buf) {
1272 /* allocate a page of memory for a transmit buffer */
1273 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1274 if (!info->tx_buf) {
1275 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1276 __FILE__,__LINE__,info->device_name);
1281 info->pending_bh = 0;
1283 memset(&info->icount, 0, sizeof(info->icount));
1285 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1287 /* Allocate and claim adapter resources */
1288 retval = claim_resources(info);
1290 /* perform existence check and diagnostics */
1292 retval = adapter_test(info);
1295 if (capable(CAP_SYS_ADMIN) && tty)
1296 set_bit(TTY_IO_ERROR, &tty->flags);
1297 release_resources(info);
1301 /* program hardware for current parameters */
1302 mgslpc_change_params(info, tty);
1305 clear_bit(TTY_IO_ERROR, &tty->flags);
1307 info->port.flags |= ASYNC_INITIALIZED;
1312 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1314 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1316 unsigned long flags;
1318 if (!(info->port.flags & ASYNC_INITIALIZED))
1321 if (debug_level >= DEBUG_LEVEL_INFO)
1322 printk("%s(%d):mgslpc_shutdown(%s)\n",
1323 __FILE__,__LINE__, info->device_name );
1325 /* clear status wait queue because status changes */
1326 /* can't happen after shutting down the hardware */
1327 wake_up_interruptible(&info->status_event_wait_q);
1328 wake_up_interruptible(&info->event_wait_q);
1330 del_timer_sync(&info->tx_timer);
1333 free_page((unsigned long) info->tx_buf);
1334 info->tx_buf = NULL;
1337 spin_lock_irqsave(&info->lock,flags);
1342 /* TODO:disable interrupts instead of reset to preserve signal states */
1345 if (!tty || tty->termios.c_cflag & HUPCL) {
1346 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1350 spin_unlock_irqrestore(&info->lock,flags);
1352 release_resources(info);
1355 set_bit(TTY_IO_ERROR, &tty->flags);
1357 info->port.flags &= ~ASYNC_INITIALIZED;
1360 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1362 unsigned long flags;
1364 spin_lock_irqsave(&info->lock,flags);
1368 info->tx_count = info->tx_put = info->tx_get = 0;
1370 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1377 info->dcd_chkcount = 0;
1378 info->cts_chkcount = 0;
1379 info->ri_chkcount = 0;
1380 info->dsr_chkcount = 0;
1382 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1383 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1386 if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1389 spin_unlock_irqrestore(&info->lock,flags);
1392 /* Reconfigure adapter based on new parameters
1394 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1402 if (debug_level >= DEBUG_LEVEL_INFO)
1403 printk("%s(%d):mgslpc_change_params(%s)\n",
1404 __FILE__,__LINE__, info->device_name );
1406 cflag = tty->termios.c_cflag;
1408 /* if B0 rate (hangup) specified then negate RTS and DTR */
1409 /* otherwise assert RTS and DTR */
1411 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1413 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1415 /* byte size and parity */
1417 switch (cflag & CSIZE) {
1418 case CS5: info->params.data_bits = 5; break;
1419 case CS6: info->params.data_bits = 6; break;
1420 case CS7: info->params.data_bits = 7; break;
1421 case CS8: info->params.data_bits = 8; break;
1422 default: info->params.data_bits = 7; break;
1426 info->params.stop_bits = 2;
1428 info->params.stop_bits = 1;
1430 info->params.parity = ASYNC_PARITY_NONE;
1431 if (cflag & PARENB) {
1433 info->params.parity = ASYNC_PARITY_ODD;
1435 info->params.parity = ASYNC_PARITY_EVEN;
1438 info->params.parity = ASYNC_PARITY_SPACE;
1442 /* calculate number of jiffies to transmit a full
1443 * FIFO (32 bytes) at specified data rate
1445 bits_per_char = info->params.data_bits +
1446 info->params.stop_bits + 1;
1448 /* if port data rate is set to 460800 or less then
1449 * allow tty settings to override, otherwise keep the
1450 * current data rate.
1452 if (info->params.data_rate <= 460800) {
1453 info->params.data_rate = tty_get_baud_rate(tty);
1456 if ( info->params.data_rate ) {
1457 info->timeout = (32*HZ*bits_per_char) /
1458 info->params.data_rate;
1460 info->timeout += HZ/50; /* Add .02 seconds of slop */
1462 if (cflag & CRTSCTS)
1463 info->port.flags |= ASYNC_CTS_FLOW;
1465 info->port.flags &= ~ASYNC_CTS_FLOW;
1468 info->port.flags &= ~ASYNC_CHECK_CD;
1470 info->port.flags |= ASYNC_CHECK_CD;
1472 /* process tty input control flags */
1474 info->read_status_mask = 0;
1476 info->read_status_mask |= BIT7 | BIT6;
1478 info->ignore_status_mask |= BIT7 | BIT6;
1480 mgslpc_program_hw(info, tty);
1483 /* Add a character to the transmit buffer
1485 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1487 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1488 unsigned long flags;
1490 if (debug_level >= DEBUG_LEVEL_INFO) {
1491 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1492 __FILE__,__LINE__,ch,info->device_name);
1495 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1501 spin_lock_irqsave(&info->lock,flags);
1503 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1504 if (info->tx_count < TXBUFSIZE - 1) {
1505 info->tx_buf[info->tx_put++] = ch;
1506 info->tx_put &= TXBUFSIZE-1;
1511 spin_unlock_irqrestore(&info->lock,flags);
1515 /* Enable transmitter so remaining characters in the
1516 * transmit buffer are sent.
1518 static void mgslpc_flush_chars(struct tty_struct *tty)
1520 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1521 unsigned long flags;
1523 if (debug_level >= DEBUG_LEVEL_INFO)
1524 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1525 __FILE__,__LINE__,info->device_name,info->tx_count);
1527 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1530 if (info->tx_count <= 0 || tty->stopped ||
1531 tty->hw_stopped || !info->tx_buf)
1534 if (debug_level >= DEBUG_LEVEL_INFO)
1535 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1536 __FILE__,__LINE__,info->device_name);
1538 spin_lock_irqsave(&info->lock,flags);
1539 if (!info->tx_active)
1540 tx_start(info, tty);
1541 spin_unlock_irqrestore(&info->lock,flags);
1544 /* Send a block of data
1548 * tty pointer to tty information structure
1549 * buf pointer to buffer containing send data
1550 * count size of send data in bytes
1552 * Returns: number of characters written
1554 static int mgslpc_write(struct tty_struct * tty,
1555 const unsigned char *buf, int count)
1558 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1559 unsigned long flags;
1561 if (debug_level >= DEBUG_LEVEL_INFO)
1562 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1563 __FILE__,__LINE__,info->device_name,count);
1565 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1569 if (info->params.mode == MGSL_MODE_HDLC) {
1570 if (count > TXBUFSIZE) {
1574 if (info->tx_active)
1576 else if (info->tx_count)
1582 min(TXBUFSIZE - info->tx_count - 1,
1583 TXBUFSIZE - info->tx_put));
1587 memcpy(info->tx_buf + info->tx_put, buf, c);
1589 spin_lock_irqsave(&info->lock,flags);
1590 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1591 info->tx_count += c;
1592 spin_unlock_irqrestore(&info->lock,flags);
1599 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1600 spin_lock_irqsave(&info->lock,flags);
1601 if (!info->tx_active)
1602 tx_start(info, tty);
1603 spin_unlock_irqrestore(&info->lock,flags);
1606 if (debug_level >= DEBUG_LEVEL_INFO)
1607 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1608 __FILE__,__LINE__,info->device_name,ret);
1612 /* Return the count of free bytes in transmit buffer
1614 static int mgslpc_write_room(struct tty_struct *tty)
1616 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1619 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1622 if (info->params.mode == MGSL_MODE_HDLC) {
1623 /* HDLC (frame oriented) mode */
1624 if (info->tx_active)
1627 return HDLC_MAX_FRAME_SIZE;
1629 ret = TXBUFSIZE - info->tx_count - 1;
1634 if (debug_level >= DEBUG_LEVEL_INFO)
1635 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1636 __FILE__,__LINE__, info->device_name, ret);
1640 /* Return the count of bytes in transmit buffer
1642 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1644 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1647 if (debug_level >= DEBUG_LEVEL_INFO)
1648 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1649 __FILE__,__LINE__, info->device_name );
1651 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1654 if (info->params.mode == MGSL_MODE_HDLC)
1655 rc = info->tx_active ? info->max_frame_size : 0;
1657 rc = info->tx_count;
1659 if (debug_level >= DEBUG_LEVEL_INFO)
1660 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1661 __FILE__,__LINE__, info->device_name, rc);
1666 /* Discard all data in the send buffer
1668 static void mgslpc_flush_buffer(struct tty_struct *tty)
1670 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1671 unsigned long flags;
1673 if (debug_level >= DEBUG_LEVEL_INFO)
1674 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1675 __FILE__,__LINE__, info->device_name );
1677 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1680 spin_lock_irqsave(&info->lock,flags);
1681 info->tx_count = info->tx_put = info->tx_get = 0;
1682 del_timer(&info->tx_timer);
1683 spin_unlock_irqrestore(&info->lock,flags);
1685 wake_up_interruptible(&tty->write_wait);
1689 /* Send a high-priority XON/XOFF character
1691 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1693 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1694 unsigned long flags;
1696 if (debug_level >= DEBUG_LEVEL_INFO)
1697 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1698 __FILE__,__LINE__, info->device_name, ch );
1700 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1705 spin_lock_irqsave(&info->lock,flags);
1706 if (!info->tx_enabled)
1707 tx_start(info, tty);
1708 spin_unlock_irqrestore(&info->lock,flags);
1712 /* Signal remote device to throttle send data (our receive data)
1714 static void mgslpc_throttle(struct tty_struct * tty)
1716 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1717 unsigned long flags;
1719 if (debug_level >= DEBUG_LEVEL_INFO)
1720 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1721 __FILE__,__LINE__, info->device_name );
1723 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1727 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1729 if (tty->termios.c_cflag & CRTSCTS) {
1730 spin_lock_irqsave(&info->lock,flags);
1731 info->serial_signals &= ~SerialSignal_RTS;
1733 spin_unlock_irqrestore(&info->lock,flags);
1737 /* Signal remote device to stop throttling send data (our receive data)
1739 static void mgslpc_unthrottle(struct tty_struct * tty)
1741 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1742 unsigned long flags;
1744 if (debug_level >= DEBUG_LEVEL_INFO)
1745 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1746 __FILE__,__LINE__, info->device_name );
1748 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1755 mgslpc_send_xchar(tty, START_CHAR(tty));
1758 if (tty->termios.c_cflag & CRTSCTS) {
1759 spin_lock_irqsave(&info->lock,flags);
1760 info->serial_signals |= SerialSignal_RTS;
1762 spin_unlock_irqrestore(&info->lock,flags);
1766 /* get the current serial statistics
1768 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1771 if (debug_level >= DEBUG_LEVEL_INFO)
1772 printk("get_params(%s)\n", info->device_name);
1774 memset(&info->icount, 0, sizeof(info->icount));
1776 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1783 /* get the current serial parameters
1785 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1788 if (debug_level >= DEBUG_LEVEL_INFO)
1789 printk("get_params(%s)\n", info->device_name);
1790 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1796 /* set the serial parameters
1800 * info pointer to device instance data
1801 * new_params user buffer containing new serial params
1803 * Returns: 0 if success, otherwise error code
1805 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1807 unsigned long flags;
1808 MGSL_PARAMS tmp_params;
1811 if (debug_level >= DEBUG_LEVEL_INFO)
1812 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1813 info->device_name );
1814 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1816 if ( debug_level >= DEBUG_LEVEL_INFO )
1817 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1818 __FILE__,__LINE__,info->device_name);
1822 spin_lock_irqsave(&info->lock,flags);
1823 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1824 spin_unlock_irqrestore(&info->lock,flags);
1826 mgslpc_change_params(info, tty);
1831 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1834 if (debug_level >= DEBUG_LEVEL_INFO)
1835 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1836 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1842 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1844 unsigned long flags;
1845 if (debug_level >= DEBUG_LEVEL_INFO)
1846 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1847 spin_lock_irqsave(&info->lock,flags);
1848 info->idle_mode = idle_mode;
1850 spin_unlock_irqrestore(&info->lock,flags);
1854 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1857 if (debug_level >= DEBUG_LEVEL_INFO)
1858 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1859 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1865 static int set_interface(MGSLPC_INFO * info, int if_mode)
1867 unsigned long flags;
1869 if (debug_level >= DEBUG_LEVEL_INFO)
1870 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1871 spin_lock_irqsave(&info->lock,flags);
1872 info->if_mode = if_mode;
1874 val = read_reg(info, PVR) & 0x0f;
1875 switch (info->if_mode)
1877 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1878 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1879 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1881 write_reg(info, PVR, val);
1883 spin_unlock_irqrestore(&info->lock,flags);
1887 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1889 unsigned long flags;
1891 if (debug_level >= DEBUG_LEVEL_INFO)
1892 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1894 spin_lock_irqsave(&info->lock,flags);
1896 if (!info->tx_enabled)
1897 tx_start(info, tty);
1899 if (info->tx_enabled)
1902 spin_unlock_irqrestore(&info->lock,flags);
1906 static int tx_abort(MGSLPC_INFO * info)
1908 unsigned long flags;
1910 if (debug_level >= DEBUG_LEVEL_INFO)
1911 printk("tx_abort(%s)\n", info->device_name);
1913 spin_lock_irqsave(&info->lock,flags);
1914 if (info->tx_active && info->tx_count &&
1915 info->params.mode == MGSL_MODE_HDLC) {
1916 /* clear data count so FIFO is not filled on next IRQ.
1917 * This results in underrun and abort transmission.
1919 info->tx_count = info->tx_put = info->tx_get = 0;
1920 info->tx_aborting = true;
1922 spin_unlock_irqrestore(&info->lock,flags);
1926 static int set_rxenable(MGSLPC_INFO * info, int enable)
1928 unsigned long flags;
1930 if (debug_level >= DEBUG_LEVEL_INFO)
1931 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1933 spin_lock_irqsave(&info->lock,flags);
1935 if (!info->rx_enabled)
1938 if (info->rx_enabled)
1941 spin_unlock_irqrestore(&info->lock,flags);
1945 /* wait for specified event to occur
1947 * Arguments: info pointer to device instance data
1948 * mask pointer to bitmask of events to wait for
1949 * Return Value: 0 if successful and bit mask updated with
1950 * of events triggerred,
1951 * otherwise error code
1953 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1955 unsigned long flags;
1958 struct mgsl_icount cprev, cnow;
1961 struct _input_signal_events oldsigs, newsigs;
1962 DECLARE_WAITQUEUE(wait, current);
1964 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1968 if (debug_level >= DEBUG_LEVEL_INFO)
1969 printk("wait_events(%s,%d)\n", info->device_name, mask);
1971 spin_lock_irqsave(&info->lock,flags);
1973 /* return immediately if state matches requested events */
1975 s = info->serial_signals;
1977 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1978 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1979 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1980 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1982 spin_unlock_irqrestore(&info->lock,flags);
1986 /* save current irq counts */
1987 cprev = info->icount;
1988 oldsigs = info->input_signal_events;
1990 if ((info->params.mode == MGSL_MODE_HDLC) &&
1991 (mask & MgslEvent_ExitHuntMode))
1992 irq_enable(info, CHA, IRQ_EXITHUNT);
1994 set_current_state(TASK_INTERRUPTIBLE);
1995 add_wait_queue(&info->event_wait_q, &wait);
1997 spin_unlock_irqrestore(&info->lock,flags);
2002 if (signal_pending(current)) {
2007 /* get current irq counts */
2008 spin_lock_irqsave(&info->lock,flags);
2009 cnow = info->icount;
2010 newsigs = info->input_signal_events;
2011 set_current_state(TASK_INTERRUPTIBLE);
2012 spin_unlock_irqrestore(&info->lock,flags);
2014 /* if no change, wait aborted for some reason */
2015 if (newsigs.dsr_up == oldsigs.dsr_up &&
2016 newsigs.dsr_down == oldsigs.dsr_down &&
2017 newsigs.dcd_up == oldsigs.dcd_up &&
2018 newsigs.dcd_down == oldsigs.dcd_down &&
2019 newsigs.cts_up == oldsigs.cts_up &&
2020 newsigs.cts_down == oldsigs.cts_down &&
2021 newsigs.ri_up == oldsigs.ri_up &&
2022 newsigs.ri_down == oldsigs.ri_down &&
2023 cnow.exithunt == cprev.exithunt &&
2024 cnow.rxidle == cprev.rxidle) {
2030 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2031 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2032 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2033 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2034 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2035 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2036 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2037 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2038 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2039 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2047 remove_wait_queue(&info->event_wait_q, &wait);
2048 set_current_state(TASK_RUNNING);
2050 if (mask & MgslEvent_ExitHuntMode) {
2051 spin_lock_irqsave(&info->lock,flags);
2052 if (!waitqueue_active(&info->event_wait_q))
2053 irq_disable(info, CHA, IRQ_EXITHUNT);
2054 spin_unlock_irqrestore(&info->lock,flags);
2058 PUT_USER(rc, events, mask_ptr);
2062 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2064 unsigned long flags;
2066 struct mgsl_icount cprev, cnow;
2067 DECLARE_WAITQUEUE(wait, current);
2069 /* save current irq counts */
2070 spin_lock_irqsave(&info->lock,flags);
2071 cprev = info->icount;
2072 add_wait_queue(&info->status_event_wait_q, &wait);
2073 set_current_state(TASK_INTERRUPTIBLE);
2074 spin_unlock_irqrestore(&info->lock,flags);
2078 if (signal_pending(current)) {
2083 /* get new irq counts */
2084 spin_lock_irqsave(&info->lock,flags);
2085 cnow = info->icount;
2086 set_current_state(TASK_INTERRUPTIBLE);
2087 spin_unlock_irqrestore(&info->lock,flags);
2089 /* if no change, wait aborted for some reason */
2090 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2091 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2096 /* check for change in caller specified modem input */
2097 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2098 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2099 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2100 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2107 remove_wait_queue(&info->status_event_wait_q, &wait);
2108 set_current_state(TASK_RUNNING);
2112 /* return the state of the serial control and status signals
2114 static int tiocmget(struct tty_struct *tty)
2116 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2117 unsigned int result;
2118 unsigned long flags;
2120 spin_lock_irqsave(&info->lock,flags);
2122 spin_unlock_irqrestore(&info->lock,flags);
2124 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2125 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2126 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2127 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2128 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2129 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2131 if (debug_level >= DEBUG_LEVEL_INFO)
2132 printk("%s(%d):%s tiocmget() value=%08X\n",
2133 __FILE__,__LINE__, info->device_name, result );
2137 /* set modem control signals (DTR/RTS)
2139 static int tiocmset(struct tty_struct *tty,
2140 unsigned int set, unsigned int clear)
2142 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2143 unsigned long flags;
2145 if (debug_level >= DEBUG_LEVEL_INFO)
2146 printk("%s(%d):%s tiocmset(%x,%x)\n",
2147 __FILE__,__LINE__,info->device_name, set, clear);
2149 if (set & TIOCM_RTS)
2150 info->serial_signals |= SerialSignal_RTS;
2151 if (set & TIOCM_DTR)
2152 info->serial_signals |= SerialSignal_DTR;
2153 if (clear & TIOCM_RTS)
2154 info->serial_signals &= ~SerialSignal_RTS;
2155 if (clear & TIOCM_DTR)
2156 info->serial_signals &= ~SerialSignal_DTR;
2158 spin_lock_irqsave(&info->lock,flags);
2160 spin_unlock_irqrestore(&info->lock,flags);
2165 /* Set or clear transmit break condition
2167 * Arguments: tty pointer to tty instance data
2168 * break_state -1=set break condition, 0=clear
2170 static int mgslpc_break(struct tty_struct *tty, int break_state)
2172 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2173 unsigned long flags;
2175 if (debug_level >= DEBUG_LEVEL_INFO)
2176 printk("%s(%d):mgslpc_break(%s,%d)\n",
2177 __FILE__,__LINE__, info->device_name, break_state);
2179 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2182 spin_lock_irqsave(&info->lock,flags);
2183 if (break_state == -1)
2184 set_reg_bits(info, CHA+DAFO, BIT6);
2186 clear_reg_bits(info, CHA+DAFO, BIT6);
2187 spin_unlock_irqrestore(&info->lock,flags);
2191 static int mgslpc_get_icount(struct tty_struct *tty,
2192 struct serial_icounter_struct *icount)
2194 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2195 struct mgsl_icount cnow; /* kernel counter temps */
2196 unsigned long flags;
2198 spin_lock_irqsave(&info->lock,flags);
2199 cnow = info->icount;
2200 spin_unlock_irqrestore(&info->lock,flags);
2202 icount->cts = cnow.cts;
2203 icount->dsr = cnow.dsr;
2204 icount->rng = cnow.rng;
2205 icount->dcd = cnow.dcd;
2206 icount->rx = cnow.rx;
2207 icount->tx = cnow.tx;
2208 icount->frame = cnow.frame;
2209 icount->overrun = cnow.overrun;
2210 icount->parity = cnow.parity;
2211 icount->brk = cnow.brk;
2212 icount->buf_overrun = cnow.buf_overrun;
2217 /* Service an IOCTL request
2221 * tty pointer to tty instance data
2222 * cmd IOCTL command code
2223 * arg command argument/context
2225 * Return Value: 0 if success, otherwise error code
2227 static int mgslpc_ioctl(struct tty_struct *tty,
2228 unsigned int cmd, unsigned long arg)
2230 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2231 void __user *argp = (void __user *)arg;
2233 if (debug_level >= DEBUG_LEVEL_INFO)
2234 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2235 info->device_name, cmd );
2237 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2240 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2241 (cmd != TIOCMIWAIT)) {
2242 if (tty->flags & (1 << TTY_IO_ERROR))
2247 case MGSL_IOCGPARAMS:
2248 return get_params(info, argp);
2249 case MGSL_IOCSPARAMS:
2250 return set_params(info, argp, tty);
2251 case MGSL_IOCGTXIDLE:
2252 return get_txidle(info, argp);
2253 case MGSL_IOCSTXIDLE:
2254 return set_txidle(info, (int)arg);
2256 return get_interface(info, argp);
2258 return set_interface(info,(int)arg);
2259 case MGSL_IOCTXENABLE:
2260 return set_txenable(info,(int)arg, tty);
2261 case MGSL_IOCRXENABLE:
2262 return set_rxenable(info,(int)arg);
2263 case MGSL_IOCTXABORT:
2264 return tx_abort(info);
2265 case MGSL_IOCGSTATS:
2266 return get_stats(info, argp);
2267 case MGSL_IOCWAITEVENT:
2268 return wait_events(info, argp);
2270 return modem_input_wait(info,(int)arg);
2272 return -ENOIOCTLCMD;
2277 /* Set new termios settings
2281 * tty pointer to tty structure
2282 * termios pointer to buffer to hold returned old termios
2284 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2286 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2287 unsigned long flags;
2289 if (debug_level >= DEBUG_LEVEL_INFO)
2290 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2291 tty->driver->name );
2293 /* just return if nothing has changed */
2294 if ((tty->termios.c_cflag == old_termios->c_cflag)
2295 && (RELEVANT_IFLAG(tty->termios.c_iflag)
2296 == RELEVANT_IFLAG(old_termios->c_iflag)))
2299 mgslpc_change_params(info, tty);
2301 /* Handle transition to B0 status */
2302 if (old_termios->c_cflag & CBAUD &&
2303 !(tty->termios.c_cflag & CBAUD)) {
2304 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2305 spin_lock_irqsave(&info->lock,flags);
2307 spin_unlock_irqrestore(&info->lock,flags);
2310 /* Handle transition away from B0 status */
2311 if (!(old_termios->c_cflag & CBAUD) &&
2312 tty->termios.c_cflag & CBAUD) {
2313 info->serial_signals |= SerialSignal_DTR;
2314 if (!(tty->termios.c_cflag & CRTSCTS) ||
2315 !test_bit(TTY_THROTTLED, &tty->flags)) {
2316 info->serial_signals |= SerialSignal_RTS;
2318 spin_lock_irqsave(&info->lock,flags);
2320 spin_unlock_irqrestore(&info->lock,flags);
2323 /* Handle turning off CRTSCTS */
2324 if (old_termios->c_cflag & CRTSCTS &&
2325 !(tty->termios.c_cflag & CRTSCTS)) {
2326 tty->hw_stopped = 0;
2331 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2333 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2334 struct tty_port *port = &info->port;
2336 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2339 if (debug_level >= DEBUG_LEVEL_INFO)
2340 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2341 __FILE__,__LINE__, info->device_name, port->count);
2343 WARN_ON(!port->count);
2345 if (tty_port_close_start(port, tty, filp) == 0)
2348 if (port->flags & ASYNC_INITIALIZED)
2349 mgslpc_wait_until_sent(tty, info->timeout);
2351 mgslpc_flush_buffer(tty);
2353 tty_ldisc_flush(tty);
2354 shutdown(info, tty);
2356 tty_port_close_end(port, tty);
2357 tty_port_tty_set(port, NULL);
2359 if (debug_level >= DEBUG_LEVEL_INFO)
2360 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2361 tty->driver->name, port->count);
2364 /* Wait until the transmitter is empty.
2366 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2368 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2369 unsigned long orig_jiffies, char_time;
2374 if (debug_level >= DEBUG_LEVEL_INFO)
2375 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2376 __FILE__,__LINE__, info->device_name );
2378 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2381 if (!(info->port.flags & ASYNC_INITIALIZED))
2384 orig_jiffies = jiffies;
2386 /* Set check interval to 1/5 of estimated time to
2387 * send a character, and make it at least 1. The check
2388 * interval should also be less than the timeout.
2389 * Note: use tight timings here to satisfy the NIST-PCTS.
2392 if ( info->params.data_rate ) {
2393 char_time = info->timeout/(32 * 5);
2400 char_time = min_t(unsigned long, char_time, timeout);
2402 if (info->params.mode == MGSL_MODE_HDLC) {
2403 while (info->tx_active) {
2404 msleep_interruptible(jiffies_to_msecs(char_time));
2405 if (signal_pending(current))
2407 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2411 while ((info->tx_count || info->tx_active) &&
2413 msleep_interruptible(jiffies_to_msecs(char_time));
2414 if (signal_pending(current))
2416 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2422 if (debug_level >= DEBUG_LEVEL_INFO)
2423 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2424 __FILE__,__LINE__, info->device_name );
2427 /* Called by tty_hangup() when a hangup is signaled.
2428 * This is the same as closing all open files for the port.
2430 static void mgslpc_hangup(struct tty_struct *tty)
2432 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2434 if (debug_level >= DEBUG_LEVEL_INFO)
2435 printk("%s(%d):mgslpc_hangup(%s)\n",
2436 __FILE__,__LINE__, info->device_name );
2438 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2441 mgslpc_flush_buffer(tty);
2442 shutdown(info, tty);
2443 tty_port_hangup(&info->port);
2446 static int carrier_raised(struct tty_port *port)
2448 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2449 unsigned long flags;
2451 spin_lock_irqsave(&info->lock,flags);
2453 spin_unlock_irqrestore(&info->lock,flags);
2455 if (info->serial_signals & SerialSignal_DCD)
2460 static void dtr_rts(struct tty_port *port, int onoff)
2462 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2463 unsigned long flags;
2465 spin_lock_irqsave(&info->lock,flags);
2467 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2469 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2471 spin_unlock_irqrestore(&info->lock,flags);
2475 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2478 struct tty_port *port;
2480 unsigned long flags;
2482 /* verify range of specified line number */
2484 if (line >= mgslpc_device_count) {
2485 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2486 __FILE__,__LINE__,line);
2490 /* find the info structure for the specified line */
2491 info = mgslpc_device_list;
2492 while(info && info->line != line)
2493 info = info->next_device;
2494 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2498 tty->driver_data = info;
2499 tty_port_tty_set(port, tty);
2501 if (debug_level >= DEBUG_LEVEL_INFO)
2502 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2503 __FILE__,__LINE__,tty->driver->name, port->count);
2505 /* If port is closing, signal caller to try again */
2506 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2507 if (port->flags & ASYNC_CLOSING)
2508 interruptible_sleep_on(&port->close_wait);
2509 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2510 -EAGAIN : -ERESTARTSYS);
2514 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2516 spin_lock_irqsave(&info->netlock, flags);
2517 if (info->netcount) {
2519 spin_unlock_irqrestore(&info->netlock, flags);
2522 spin_lock(&port->lock);
2524 spin_unlock(&port->lock);
2525 spin_unlock_irqrestore(&info->netlock, flags);
2527 if (port->count == 1) {
2528 /* 1st open on this device, init hardware */
2529 retval = startup(info, tty);
2534 retval = tty_port_block_til_ready(&info->port, tty, filp);
2536 if (debug_level >= DEBUG_LEVEL_INFO)
2537 printk("%s(%d):block_til_ready(%s) returned %d\n",
2538 __FILE__,__LINE__, info->device_name, retval);
2542 if (debug_level >= DEBUG_LEVEL_INFO)
2543 printk("%s(%d):mgslpc_open(%s) success\n",
2544 __FILE__,__LINE__, info->device_name);
2552 * /proc fs routines....
2555 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2558 unsigned long flags;
2560 seq_printf(m, "%s:io:%04X irq:%d",
2561 info->device_name, info->io_base, info->irq_level);
2563 /* output current serial signal states */
2564 spin_lock_irqsave(&info->lock,flags);
2566 spin_unlock_irqrestore(&info->lock,flags);
2570 if (info->serial_signals & SerialSignal_RTS)
2571 strcat(stat_buf, "|RTS");
2572 if (info->serial_signals & SerialSignal_CTS)
2573 strcat(stat_buf, "|CTS");
2574 if (info->serial_signals & SerialSignal_DTR)
2575 strcat(stat_buf, "|DTR");
2576 if (info->serial_signals & SerialSignal_DSR)
2577 strcat(stat_buf, "|DSR");
2578 if (info->serial_signals & SerialSignal_DCD)
2579 strcat(stat_buf, "|CD");
2580 if (info->serial_signals & SerialSignal_RI)
2581 strcat(stat_buf, "|RI");
2583 if (info->params.mode == MGSL_MODE_HDLC) {
2584 seq_printf(m, " HDLC txok:%d rxok:%d",
2585 info->icount.txok, info->icount.rxok);
2586 if (info->icount.txunder)
2587 seq_printf(m, " txunder:%d", info->icount.txunder);
2588 if (info->icount.txabort)
2589 seq_printf(m, " txabort:%d", info->icount.txabort);
2590 if (info->icount.rxshort)
2591 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2592 if (info->icount.rxlong)
2593 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2594 if (info->icount.rxover)
2595 seq_printf(m, " rxover:%d", info->icount.rxover);
2596 if (info->icount.rxcrc)
2597 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2599 seq_printf(m, " ASYNC tx:%d rx:%d",
2600 info->icount.tx, info->icount.rx);
2601 if (info->icount.frame)
2602 seq_printf(m, " fe:%d", info->icount.frame);
2603 if (info->icount.parity)
2604 seq_printf(m, " pe:%d", info->icount.parity);
2605 if (info->icount.brk)
2606 seq_printf(m, " brk:%d", info->icount.brk);
2607 if (info->icount.overrun)
2608 seq_printf(m, " oe:%d", info->icount.overrun);
2611 /* Append serial signal status to end */
2612 seq_printf(m, " %s\n", stat_buf+1);
2614 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2615 info->tx_active,info->bh_requested,info->bh_running,
2619 /* Called to print information about devices
2621 static int mgslpc_proc_show(struct seq_file *m, void *v)
2625 seq_printf(m, "synclink driver:%s\n", driver_version);
2627 info = mgslpc_device_list;
2630 info = info->next_device;
2635 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2637 return single_open(file, mgslpc_proc_show, NULL);
2640 static const struct file_operations mgslpc_proc_fops = {
2641 .owner = THIS_MODULE,
2642 .open = mgslpc_proc_open,
2644 .llseek = seq_lseek,
2645 .release = single_release,
2648 static int rx_alloc_buffers(MGSLPC_INFO *info)
2650 /* each buffer has header and data */
2651 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2653 /* calculate total allocation size for 8 buffers */
2654 info->rx_buf_total_size = info->rx_buf_size * 8;
2656 /* limit total allocated memory */
2657 if (info->rx_buf_total_size > 0x10000)
2658 info->rx_buf_total_size = 0x10000;
2660 /* calculate number of buffers */
2661 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2663 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2664 if (info->rx_buf == NULL)
2667 /* unused flag buffer to satisfy receive_buf calling interface */
2668 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2669 if (!info->flag_buf) {
2670 kfree(info->rx_buf);
2671 info->rx_buf = NULL;
2675 rx_reset_buffers(info);
2679 static void rx_free_buffers(MGSLPC_INFO *info)
2681 kfree(info->rx_buf);
2682 info->rx_buf = NULL;
2683 kfree(info->flag_buf);
2684 info->flag_buf = NULL;
2687 static int claim_resources(MGSLPC_INFO *info)
2689 if (rx_alloc_buffers(info) < 0 ) {
2690 printk( "Can't allocate rx buffer %s\n", info->device_name);
2691 release_resources(info);
2697 static void release_resources(MGSLPC_INFO *info)
2699 if (debug_level >= DEBUG_LEVEL_INFO)
2700 printk("release_resources(%s)\n", info->device_name);
2701 rx_free_buffers(info);
2704 /* Add the specified device instance data structure to the
2705 * global linked list of devices and increment the device count.
2707 * Arguments: info pointer to device instance data
2709 static void mgslpc_add_device(MGSLPC_INFO *info)
2711 info->next_device = NULL;
2712 info->line = mgslpc_device_count;
2713 sprintf(info->device_name,"ttySLP%d",info->line);
2715 if (info->line < MAX_DEVICE_COUNT) {
2716 if (maxframe[info->line])
2717 info->max_frame_size = maxframe[info->line];
2720 mgslpc_device_count++;
2722 if (!mgslpc_device_list)
2723 mgslpc_device_list = info;
2725 MGSLPC_INFO *current_dev = mgslpc_device_list;
2726 while( current_dev->next_device )
2727 current_dev = current_dev->next_device;
2728 current_dev->next_device = info;
2731 if (info->max_frame_size < 4096)
2732 info->max_frame_size = 4096;
2733 else if (info->max_frame_size > 65535)
2734 info->max_frame_size = 65535;
2736 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2737 info->device_name, info->io_base, info->irq_level);
2739 #if SYNCLINK_GENERIC_HDLC
2742 tty_port_register_device(&info->port, serial_driver, info->line,
2746 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2748 MGSLPC_INFO *info = mgslpc_device_list;
2749 MGSLPC_INFO *last = NULL;
2752 if (info == remove_info) {
2754 last->next_device = info->next_device;
2756 mgslpc_device_list = info->next_device;
2757 tty_unregister_device(serial_driver, info->line);
2758 #if SYNCLINK_GENERIC_HDLC
2761 release_resources(info);
2762 tty_port_destroy(&info->port);
2764 mgslpc_device_count--;
2768 info = info->next_device;
2772 static const struct pcmcia_device_id mgslpc_ids[] = {
2773 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2776 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2778 static struct pcmcia_driver mgslpc_driver = {
2779 .owner = THIS_MODULE,
2780 .name = "synclink_cs",
2781 .probe = mgslpc_probe,
2782 .remove = mgslpc_detach,
2783 .id_table = mgslpc_ids,
2784 .suspend = mgslpc_suspend,
2785 .resume = mgslpc_resume,
2788 static const struct tty_operations mgslpc_ops = {
2789 .open = mgslpc_open,
2790 .close = mgslpc_close,
2791 .write = mgslpc_write,
2792 .put_char = mgslpc_put_char,
2793 .flush_chars = mgslpc_flush_chars,
2794 .write_room = mgslpc_write_room,
2795 .chars_in_buffer = mgslpc_chars_in_buffer,
2796 .flush_buffer = mgslpc_flush_buffer,
2797 .ioctl = mgslpc_ioctl,
2798 .throttle = mgslpc_throttle,
2799 .unthrottle = mgslpc_unthrottle,
2800 .send_xchar = mgslpc_send_xchar,
2801 .break_ctl = mgslpc_break,
2802 .wait_until_sent = mgslpc_wait_until_sent,
2803 .set_termios = mgslpc_set_termios,
2805 .start = tx_release,
2806 .hangup = mgslpc_hangup,
2807 .tiocmget = tiocmget,
2808 .tiocmset = tiocmset,
2809 .get_icount = mgslpc_get_icount,
2810 .proc_fops = &mgslpc_proc_fops,
2813 static int __init synclink_cs_init(void)
2817 if (break_on_load) {
2818 mgslpc_get_text_ptr();
2822 serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2823 TTY_DRIVER_REAL_RAW |
2824 TTY_DRIVER_DYNAMIC_DEV);
2825 if (IS_ERR(serial_driver)) {
2826 rc = PTR_ERR(serial_driver);
2830 /* Initialize the tty_driver structure */
2831 serial_driver->driver_name = "synclink_cs";
2832 serial_driver->name = "ttySLP";
2833 serial_driver->major = ttymajor;
2834 serial_driver->minor_start = 64;
2835 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2836 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2837 serial_driver->init_termios = tty_std_termios;
2838 serial_driver->init_termios.c_cflag =
2839 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2840 tty_set_operations(serial_driver, &mgslpc_ops);
2842 rc = tty_register_driver(serial_driver);
2844 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2845 __FILE__, __LINE__);
2849 rc = pcmcia_register_driver(&mgslpc_driver);
2853 printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2854 serial_driver->major);
2858 tty_unregister_driver(serial_driver);
2860 put_tty_driver(serial_driver);
2865 static void __exit synclink_cs_exit(void)
2867 pcmcia_unregister_driver(&mgslpc_driver);
2868 tty_unregister_driver(serial_driver);
2869 put_tty_driver(serial_driver);
2872 module_init(synclink_cs_init);
2873 module_exit(synclink_cs_exit);
2875 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2880 /* note:standard BRG mode is broken in V3.2 chip
2881 * so enhanced mode is always used
2889 for (M = 1; N > 64 && M < 16; M++)
2895 * BGR[7..0] contained in BGR register
2896 * BGR[9..8] contained in CCR2[7..6]
2897 * divisor = (N+1)*2^M
2899 * Note: M *must* not be zero (causes asymetric duty cycle)
2901 write_reg(info, (unsigned char) (channel + BGR),
2902 (unsigned char) ((M << 6) + N));
2903 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2904 val |= ((M << 4) & 0xc0);
2905 write_reg(info, (unsigned char) (channel + CCR2), val);
2909 /* Enabled the AUX clock output at the specified frequency.
2911 static void enable_auxclk(MGSLPC_INFO *info)
2917 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2918 * 05 ADM Address Mode, 0 = no addr recognition
2919 * 04 TMD Timer Mode, 0 = external
2920 * 03 RAC Receiver Active, 0 = inactive
2921 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2922 * 01 TRS Timer Resolution, 1=512
2923 * 00 TLP Test Loop, 0 = no loop
2929 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2930 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2932 write_reg(info, CHB + MODE, val);
2936 * 07 PU Power Up, 1=active, 0=power down
2937 * 06 MCE Master Clock Enable, 1=enabled
2939 * 04..02 SC[2..0] Encoding
2940 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2944 write_reg(info, CHB + CCR0, 0xc0);
2948 * 07 SFLG Shared Flag, 0 = disable shared flags
2949 * 06 GALP Go Active On Loop, 0 = not used
2950 * 05 GLP Go On Loop, 0 = not used
2951 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2952 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2953 * 02..00 CM[2..0] Clock Mode
2957 write_reg(info, CHB + CCR1, 0x17);
2961 * 07..06 BGR[9..8] Baud rate bits 9..8
2962 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2963 * 04 SSEL Clock source select, 1=submode b
2964 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2965 * 02 RWX Read/Write Exchange 0=disabled
2966 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2967 * 00 DIV, data inversion 0=disabled, 1=enabled
2971 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2972 write_reg(info, CHB + CCR2, 0x38);
2974 write_reg(info, CHB + CCR2, 0x30);
2978 * 07 MCK4 Master Clock Divide by 4, 1=enabled
2979 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2980 * 05 TST1 Test Pin, 0=normal operation
2981 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
2982 * 03..02 Reserved, must be 0
2983 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
2987 write_reg(info, CHB + CCR4, 0x50);
2989 /* if auxclk not enabled, set internal BRG so
2990 * CTS transitions can be detected (requires TxC)
2992 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2993 mgslpc_set_rate(info, CHB, info->params.clock_speed);
2995 mgslpc_set_rate(info, CHB, 921600);
2998 static void loopback_enable(MGSLPC_INFO *info)
3002 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3003 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3004 write_reg(info, CHA + CCR1, val);
3006 /* CCR2:04 SSEL Clock source select, 1=submode b */
3007 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3008 write_reg(info, CHA + CCR2, val);
3010 /* set LinkSpeed if available, otherwise default to 2Mbps */
3011 if (info->params.clock_speed)
3012 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3014 mgslpc_set_rate(info, CHA, 1843200);
3016 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3017 val = read_reg(info, CHA + MODE) | BIT0;
3018 write_reg(info, CHA + MODE, val);
3021 static void hdlc_mode(MGSLPC_INFO *info)
3024 unsigned char clkmode, clksubmode;
3026 /* disable all interrupts */
3027 irq_disable(info, CHA, 0xffff);
3028 irq_disable(info, CHB, 0xffff);
3029 port_irq_disable(info, 0xff);
3031 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3032 clkmode = clksubmode = 0;
3033 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3034 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3035 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3037 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3038 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3039 /* clock mode 7b, rcv = BRG, xmt = BRG */
3042 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3043 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3044 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3048 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3051 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3052 /* clock mode 0b, rcv = RxC, xmt = BRG */
3058 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3059 * 05 ADM Address Mode, 0 = no addr recognition
3060 * 04 TMD Timer Mode, 0 = external
3061 * 03 RAC Receiver Active, 0 = inactive
3062 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3063 * 01 TRS Timer Resolution, 1=512
3064 * 00 TLP Test Loop, 0 = no loop
3069 if (info->params.loopback)
3072 /* preserve RTS state */
3073 if (info->serial_signals & SerialSignal_RTS)
3075 write_reg(info, CHA + MODE, val);
3079 * 07 PU Power Up, 1=active, 0=power down
3080 * 06 MCE Master Clock Enable, 1=enabled
3082 * 04..02 SC[2..0] Encoding
3083 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3088 switch (info->params.encoding)
3090 case HDLC_ENCODING_NRZI:
3093 case HDLC_ENCODING_BIPHASE_SPACE:
3096 case HDLC_ENCODING_BIPHASE_MARK:
3099 case HDLC_ENCODING_BIPHASE_LEVEL:
3101 break; // Manchester
3103 write_reg(info, CHA + CCR0, val);
3107 * 07 SFLG Shared Flag, 0 = disable shared flags
3108 * 06 GALP Go Active On Loop, 0 = not used
3109 * 05 GLP Go On Loop, 0 = not used
3110 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3111 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3112 * 02..00 CM[2..0] Clock Mode
3116 val = 0x10 + clkmode;
3117 write_reg(info, CHA + CCR1, val);
3121 * 07..06 BGR[9..8] Baud rate bits 9..8
3122 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3123 * 04 SSEL Clock source select, 1=submode b
3124 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3125 * 02 RWX Read/Write Exchange 0=disabled
3126 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3127 * 00 DIV, data inversion 0=disabled, 1=enabled
3132 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3133 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3137 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3139 if (info->params.encoding == HDLC_ENCODING_NRZB)
3141 write_reg(info, CHA + CCR2, val);
3145 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3146 * 05 EPT Enable preamble transmission, 1=enabled
3147 * 04 RADD Receive address pushed to FIFO, 0=disabled
3148 * 03 CRL CRC Reset Level, 0=FFFF
3149 * 02 RCRC Rx CRC 0=On 1=Off
3150 * 01 TCRC Tx CRC 0=On 1=Off
3151 * 00 PSD DPLL Phase Shift Disable
3156 if (info->params.crc_type == HDLC_CRC_NONE)
3158 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3160 switch (info->params.preamble_length)
3162 case HDLC_PREAMBLE_LENGTH_16BITS:
3165 case HDLC_PREAMBLE_LENGTH_32BITS:
3168 case HDLC_PREAMBLE_LENGTH_64BITS:
3172 write_reg(info, CHA + CCR3, val);
3174 /* PRE - Preamble pattern */
3176 switch (info->params.preamble)
3178 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3179 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3180 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3181 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3183 write_reg(info, CHA + PRE, val);
3187 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3188 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3189 * 05 TST1 Test Pin, 0=normal operation
3190 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3191 * 03..02 Reserved, must be 0
3192 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3197 write_reg(info, CHA + CCR4, val);
3198 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3199 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3201 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3203 /* RLCR Receive length check register
3205 * 7 1=enable receive length check
3206 * 6..0 Max frame length = (RL + 1) * 32
3208 write_reg(info, CHA + RLCR, 0);
3210 /* XBCH Transmit Byte Count High
3212 * 07 DMA mode, 0 = interrupt driven
3213 * 06 NRM, 0=ABM (ignored)
3214 * 05 CAS Carrier Auto Start
3215 * 04 XC Transmit Continuously (ignored)
3216 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3221 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3223 write_reg(info, CHA + XBCH, val);
3224 enable_auxclk(info);
3225 if (info->params.loopback || info->testing_irq)
3226 loopback_enable(info);
3227 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3229 irq_enable(info, CHB, IRQ_CTS);
3230 /* PVR[3] 1=AUTO CTS active */
3231 set_reg_bits(info, CHA + PVR, BIT3);
3233 clear_reg_bits(info, CHA + PVR, BIT3);
3235 irq_enable(info, CHA,
3236 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3237 IRQ_UNDERRUN + IRQ_TXFIFO);
3238 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3239 wait_command_complete(info, CHA);
3240 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3242 /* Master clock mode enabled above to allow reset commands
3243 * to complete even if no data clocks are present.
3245 * Disable master clock mode for normal communications because
3246 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3247 * IRQ when in master clock mode.
3249 * Leave master clock mode enabled for IRQ test because the
3250 * timer IRQ used by the test can only happen in master clock mode.
3252 if (!info->testing_irq)
3253 clear_reg_bits(info, CHA + CCR0, BIT6);
3261 static void rx_stop(MGSLPC_INFO *info)
3263 if (debug_level >= DEBUG_LEVEL_ISR)
3264 printk("%s(%d):rx_stop(%s)\n",
3265 __FILE__,__LINE__, info->device_name );
3267 /* MODE:03 RAC Receiver Active, 0=inactive */
3268 clear_reg_bits(info, CHA + MODE, BIT3);
3270 info->rx_enabled = false;
3271 info->rx_overflow = false;
3274 static void rx_start(MGSLPC_INFO *info)
3276 if (debug_level >= DEBUG_LEVEL_ISR)
3277 printk("%s(%d):rx_start(%s)\n",
3278 __FILE__,__LINE__, info->device_name );
3280 rx_reset_buffers(info);
3281 info->rx_enabled = false;
3282 info->rx_overflow = false;
3284 /* MODE:03 RAC Receiver Active, 1=active */
3285 set_reg_bits(info, CHA + MODE, BIT3);
3287 info->rx_enabled = true;
3290 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3292 if (debug_level >= DEBUG_LEVEL_ISR)
3293 printk("%s(%d):tx_start(%s)\n",
3294 __FILE__,__LINE__, info->device_name );
3296 if (info->tx_count) {
3297 /* If auto RTS enabled and RTS is inactive, then assert */
3298 /* RTS and set a flag indicating that the driver should */
3299 /* negate RTS when the transmission completes. */
3300 info->drop_rts_on_tx_done = false;
3302 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3304 if (!(info->serial_signals & SerialSignal_RTS)) {
3305 info->serial_signals |= SerialSignal_RTS;
3307 info->drop_rts_on_tx_done = true;
3311 if (info->params.mode == MGSL_MODE_ASYNC) {
3312 if (!info->tx_active) {
3313 info->tx_active = true;
3314 tx_ready(info, tty);
3317 info->tx_active = true;
3318 tx_ready(info, tty);
3319 mod_timer(&info->tx_timer, jiffies +
3320 msecs_to_jiffies(5000));
3324 if (!info->tx_enabled)
3325 info->tx_enabled = true;
3328 static void tx_stop(MGSLPC_INFO *info)
3330 if (debug_level >= DEBUG_LEVEL_ISR)
3331 printk("%s(%d):tx_stop(%s)\n",
3332 __FILE__,__LINE__, info->device_name );
3334 del_timer(&info->tx_timer);
3336 info->tx_enabled = false;
3337 info->tx_active = false;
3340 /* Reset the adapter to a known state and prepare it for further use.
3342 static void reset_device(MGSLPC_INFO *info)
3344 /* power up both channels (set BIT7) */
3345 write_reg(info, CHA + CCR0, 0x80);
3346 write_reg(info, CHB + CCR0, 0x80);
3347 write_reg(info, CHA + MODE, 0);
3348 write_reg(info, CHB + MODE, 0);
3350 /* disable all interrupts */
3351 irq_disable(info, CHA, 0xffff);
3352 irq_disable(info, CHB, 0xffff);
3353 port_irq_disable(info, 0xff);
3355 /* PCR Port Configuration Register
3357 * 07..04 DEC[3..0] Serial I/F select outputs
3358 * 03 output, 1=AUTO CTS control enabled
3359 * 02 RI Ring Indicator input 0=active
3360 * 01 DSR input 0=active
3361 * 00 DTR output 0=active
3365 write_reg(info, PCR, 0x06);
3367 /* PVR Port Value Register
3369 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3370 * 03 AUTO CTS output 1=enabled
3371 * 02 RI Ring Indicator input
3373 * 00 DTR output (1=inactive)
3377 // write_reg(info, PVR, PVR_DTR);
3379 /* IPC Interrupt Port Configuration
3381 * 07 VIS 1=Masked interrupts visible
3382 * 06..05 Reserved, 0
3383 * 04..03 SLA Slave address, 00 ignored
3384 * 02 CASM Cascading Mode, 1=daisy chain
3385 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3389 write_reg(info, IPC, 0x05);
3392 static void async_mode(MGSLPC_INFO *info)
3396 /* disable all interrupts */
3397 irq_disable(info, CHA, 0xffff);
3398 irq_disable(info, CHB, 0xffff);
3399 port_irq_disable(info, 0xff);
3404 * 06 FRTS RTS State, 0=active
3405 * 05 FCTS Flow Control on CTS
3406 * 04 FLON Flow Control Enable
3407 * 03 RAC Receiver Active, 0 = inactive
3408 * 02 RTS 0=Auto RTS, 1=manual RTS
3409 * 01 TRS Timer Resolution, 1=512
3410 * 00 TLP Test Loop, 0 = no loop
3415 if (info->params.loopback)
3418 /* preserve RTS state */
3419 if (!(info->serial_signals & SerialSignal_RTS))
3421 write_reg(info, CHA + MODE, val);
3425 * 07 PU Power Up, 1=active, 0=power down
3426 * 06 MCE Master Clock Enable, 1=enabled
3428 * 04..02 SC[2..0] Encoding, 000=NRZ
3429 * 01..00 SM[1..0] Serial Mode, 11=Async
3433 write_reg(info, CHA + CCR0, 0x83);
3437 * 07..05 Reserved, 0
3438 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3439 * 03 BCR Bit Clock Rate, 1=16x
3440 * 02..00 CM[2..0] Clock Mode, 111=BRG
3444 write_reg(info, CHA + CCR1, 0x1f);
3448 * 07..06 BGR[9..8] Baud rate bits 9..8
3449 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3450 * 04 SSEL Clock source select, 1=submode b
3451 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3452 * 02 RWX Read/Write Exchange 0=disabled
3454 * 00 DIV, data inversion 0=disabled, 1=enabled
3458 write_reg(info, CHA + CCR2, 0x10);
3462 * 07..01 Reserved, 0
3463 * 00 PSD DPLL Phase Shift Disable
3467 write_reg(info, CHA + CCR3, 0);
3471 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3472 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3473 * 05 TST1 Test Pin, 0=normal operation
3474 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3475 * 03..00 Reserved, must be 0
3479 write_reg(info, CHA + CCR4, 0x50);
3480 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3485 * 06 XBRK transmit break, 0=normal operation
3486 * 05 Stop bits (0=1, 1=2)
3487 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3488 * 02 PAREN Parity Enable
3489 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3493 if (info->params.data_bits != 8)
3494 val |= BIT0; /* 7 bits */
3495 if (info->params.stop_bits != 1)
3497 if (info->params.parity != ASYNC_PARITY_NONE)
3499 val |= BIT2; /* Parity enable */
3500 if (info->params.parity == ASYNC_PARITY_ODD)
3505 write_reg(info, CHA + DAFO, val);
3507 /* RFC Rx FIFO Control
3510 * 06 DPS, 1=parity bit not stored in data byte
3511 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3512 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3513 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3515 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3519 write_reg(info, CHA + RFC, 0x5c);
3521 /* RLCR Receive length check register
3523 * Max frame length = (RL + 1) * 32
3525 write_reg(info, CHA + RLCR, 0);
3527 /* XBCH Transmit Byte Count High
3529 * 07 DMA mode, 0 = interrupt driven
3530 * 06 NRM, 0=ABM (ignored)
3531 * 05 CAS Carrier Auto Start
3532 * 04 XC Transmit Continuously (ignored)
3533 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3538 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3540 write_reg(info, CHA + XBCH, val);
3541 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3542 irq_enable(info, CHA, IRQ_CTS);
3544 /* MODE:03 RAC Receiver Active, 1=active */
3545 set_reg_bits(info, CHA + MODE, BIT3);
3546 enable_auxclk(info);
3547 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3548 irq_enable(info, CHB, IRQ_CTS);
3549 /* PVR[3] 1=AUTO CTS active */
3550 set_reg_bits(info, CHA + PVR, BIT3);
3552 clear_reg_bits(info, CHA + PVR, BIT3);
3553 irq_enable(info, CHA,
3554 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3555 IRQ_ALLSENT + IRQ_TXFIFO);
3556 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3557 wait_command_complete(info, CHA);
3558 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3561 /* Set the HDLC idle mode for the transmitter.
3563 static void tx_set_idle(MGSLPC_INFO *info)
3565 /* Note: ESCC2 only supports flags and one idle modes */
3566 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3567 set_reg_bits(info, CHA + CCR1, BIT3);
3569 clear_reg_bits(info, CHA + CCR1, BIT3);
3572 /* get state of the V24 status (input) signals.
3574 static void get_signals(MGSLPC_INFO *info)
3576 unsigned char status = 0;
3578 /* preserve RTS and DTR */
3579 info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
3581 if (read_reg(info, CHB + VSTR) & BIT7)
3582 info->serial_signals |= SerialSignal_DCD;
3583 if (read_reg(info, CHB + STAR) & BIT1)
3584 info->serial_signals |= SerialSignal_CTS;
3586 status = read_reg(info, CHA + PVR);
3587 if (!(status & PVR_RI))
3588 info->serial_signals |= SerialSignal_RI;
3589 if (!(status & PVR_DSR))
3590 info->serial_signals |= SerialSignal_DSR;
3593 /* Set the state of RTS and DTR based on contents of
3594 * serial_signals member of device extension.
3596 static void set_signals(MGSLPC_INFO *info)
3600 val = read_reg(info, CHA + MODE);
3601 if (info->params.mode == MGSL_MODE_ASYNC) {
3602 if (info->serial_signals & SerialSignal_RTS)
3607 if (info->serial_signals & SerialSignal_RTS)
3612 write_reg(info, CHA + MODE, val);
3614 if (info->serial_signals & SerialSignal_DTR)
3615 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3617 set_reg_bits(info, CHA + PVR, PVR_DTR);
3620 static void rx_reset_buffers(MGSLPC_INFO *info)
3627 info->rx_frame_count = 0;
3628 for (i=0 ; i < info->rx_buf_count ; i++) {
3629 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3630 buf->status = buf->count = 0;
3634 /* Attempt to return a received HDLC frame
3635 * Only frames received without errors are returned.
3637 * Returns true if frame returned, otherwise false
3639 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3641 unsigned short status;
3643 unsigned int framesize = 0;
3644 unsigned long flags;
3645 bool return_frame = false;
3647 if (info->rx_frame_count == 0)
3650 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3652 status = buf->status;
3654 /* 07 VFR 1=valid frame
3655 * 06 RDO 1=data overrun
3656 * 05 CRC 1=OK, 0=error
3657 * 04 RAB 1=frame aborted
3659 if ((status & 0xf0) != 0xA0) {
3660 if (!(status & BIT7) || (status & BIT4))
3661 info->icount.rxabort++;
3662 else if (status & BIT6)
3663 info->icount.rxover++;
3664 else if (!(status & BIT5)) {
3665 info->icount.rxcrc++;
3666 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3667 return_frame = true;
3670 #if SYNCLINK_GENERIC_HDLC
3672 info->netdev->stats.rx_errors++;
3673 info->netdev->stats.rx_frame_errors++;
3677 return_frame = true;
3680 framesize = buf->count;
3682 if (debug_level >= DEBUG_LEVEL_BH)
3683 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3684 __FILE__,__LINE__,info->device_name,status,framesize);
3686 if (debug_level >= DEBUG_LEVEL_DATA)
3687 trace_block(info, buf->data, framesize, 0);
3690 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3691 framesize+1 > info->max_frame_size) ||
3692 framesize > info->max_frame_size)
3693 info->icount.rxlong++;
3696 info->icount.rxok++;
3698 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3699 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3703 #if SYNCLINK_GENERIC_HDLC
3705 hdlcdev_rx(info, buf->data, framesize);
3708 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3712 spin_lock_irqsave(&info->lock,flags);
3713 buf->status = buf->count = 0;
3714 info->rx_frame_count--;
3716 if (info->rx_get >= info->rx_buf_count)
3718 spin_unlock_irqrestore(&info->lock,flags);
3723 static bool register_test(MGSLPC_INFO *info)
3725 static unsigned char patterns[] =
3726 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3727 static unsigned int count = ARRAY_SIZE(patterns);
3730 unsigned long flags;
3732 spin_lock_irqsave(&info->lock,flags);
3735 for (i = 0; i < count; i++) {
3736 write_reg(info, XAD1, patterns[i]);
3737 write_reg(info, XAD2, patterns[(i + 1) % count]);
3738 if ((read_reg(info, XAD1) != patterns[i]) ||
3739 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3745 spin_unlock_irqrestore(&info->lock,flags);
3749 static bool irq_test(MGSLPC_INFO *info)
3751 unsigned long end_time;
3752 unsigned long flags;
3754 spin_lock_irqsave(&info->lock,flags);
3757 info->testing_irq = true;
3760 info->irq_occurred = false;
3762 /* init hdlc mode */
3764 irq_enable(info, CHA, IRQ_TIMER);
3765 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3766 issue_command(info, CHA, CMD_START_TIMER);
3768 spin_unlock_irqrestore(&info->lock,flags);
3771 while(end_time-- && !info->irq_occurred) {
3772 msleep_interruptible(10);
3775 info->testing_irq = false;
3777 spin_lock_irqsave(&info->lock,flags);
3779 spin_unlock_irqrestore(&info->lock,flags);
3781 return info->irq_occurred;
3784 static int adapter_test(MGSLPC_INFO *info)
3786 if (!register_test(info)) {
3787 info->init_error = DiagStatus_AddressFailure;
3788 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3789 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3793 if (!irq_test(info)) {
3794 info->init_error = DiagStatus_IrqFailure;
3795 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3796 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3800 if (debug_level >= DEBUG_LEVEL_INFO)
3801 printk("%s(%d):device %s passed diagnostics\n",
3802 __FILE__,__LINE__,info->device_name);
3806 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3811 printk("%s tx data:\n",info->device_name);
3813 printk("%s rx data:\n",info->device_name);
3821 for(i=0;i<linecount;i++)
3822 printk("%02X ",(unsigned char)data[i]);
3825 for(i=0;i<linecount;i++) {
3826 if (data[i]>=040 && data[i]<=0176)
3827 printk("%c",data[i]);
3838 /* HDLC frame time out
3839 * update stats and do tx completion processing
3841 static void tx_timeout(unsigned long context)
3843 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3844 unsigned long flags;
3846 if ( debug_level >= DEBUG_LEVEL_INFO )
3847 printk( "%s(%d):tx_timeout(%s)\n",
3848 __FILE__,__LINE__,info->device_name);
3849 if(info->tx_active &&
3850 info->params.mode == MGSL_MODE_HDLC) {
3851 info->icount.txtimeout++;
3853 spin_lock_irqsave(&info->lock,flags);
3854 info->tx_active = false;
3855 info->tx_count = info->tx_put = info->tx_get = 0;
3857 spin_unlock_irqrestore(&info->lock,flags);
3859 #if SYNCLINK_GENERIC_HDLC
3861 hdlcdev_tx_done(info);
3865 struct tty_struct *tty = tty_port_tty_get(&info->port);
3866 bh_transmit(info, tty);
3871 #if SYNCLINK_GENERIC_HDLC
3874 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3875 * set encoding and frame check sequence (FCS) options
3877 * dev pointer to network device structure
3878 * encoding serial encoding setting
3879 * parity FCS setting
3881 * returns 0 if success, otherwise error code
3883 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3884 unsigned short parity)
3886 MGSLPC_INFO *info = dev_to_port(dev);
3887 struct tty_struct *tty;
3888 unsigned char new_encoding;
3889 unsigned short new_crctype;
3891 /* return error if TTY interface open */
3892 if (info->port.count)
3897 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3898 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3899 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3900 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3901 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3902 default: return -EINVAL;
3907 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3908 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3909 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3910 default: return -EINVAL;
3913 info->params.encoding = new_encoding;
3914 info->params.crc_type = new_crctype;
3916 /* if network interface up, reprogram hardware */
3917 if (info->netcount) {
3918 tty = tty_port_tty_get(&info->port);
3919 mgslpc_program_hw(info, tty);
3927 * called by generic HDLC layer to send frame
3929 * skb socket buffer containing HDLC frame
3930 * dev pointer to network device structure
3932 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3933 struct net_device *dev)
3935 MGSLPC_INFO *info = dev_to_port(dev);
3936 unsigned long flags;
3938 if (debug_level >= DEBUG_LEVEL_INFO)
3939 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3941 /* stop sending until this frame completes */
3942 netif_stop_queue(dev);
3944 /* copy data to device buffers */
3945 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3947 info->tx_put = info->tx_count = skb->len;
3949 /* update network statistics */
3950 dev->stats.tx_packets++;
3951 dev->stats.tx_bytes += skb->len;
3953 /* done with socket buffer, so free it */
3956 /* save start time for transmit timeout detection */
3957 dev->trans_start = jiffies;
3959 /* start hardware transmitter if necessary */
3960 spin_lock_irqsave(&info->lock,flags);
3961 if (!info->tx_active) {
3962 struct tty_struct *tty = tty_port_tty_get(&info->port);
3963 tx_start(info, tty);
3966 spin_unlock_irqrestore(&info->lock,flags);
3968 return NETDEV_TX_OK;
3972 * called by network layer when interface enabled
3973 * claim resources and initialize hardware
3975 * dev pointer to network device structure
3977 * returns 0 if success, otherwise error code
3979 static int hdlcdev_open(struct net_device *dev)
3981 MGSLPC_INFO *info = dev_to_port(dev);
3982 struct tty_struct *tty;
3984 unsigned long flags;
3986 if (debug_level >= DEBUG_LEVEL_INFO)
3987 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
3989 /* generic HDLC layer open processing */
3990 if ((rc = hdlc_open(dev)))
3993 /* arbitrate between network and tty opens */
3994 spin_lock_irqsave(&info->netlock, flags);
3995 if (info->port.count != 0 || info->netcount != 0) {
3996 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
3997 spin_unlock_irqrestore(&info->netlock, flags);
4001 spin_unlock_irqrestore(&info->netlock, flags);
4003 tty = tty_port_tty_get(&info->port);
4004 /* claim resources and init adapter */
4005 if ((rc = startup(info, tty)) != 0) {
4007 spin_lock_irqsave(&info->netlock, flags);
4009 spin_unlock_irqrestore(&info->netlock, flags);
4012 /* assert RTS and DTR, apply hardware settings */
4013 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
4014 mgslpc_program_hw(info, tty);
4017 /* enable network layer transmit */
4018 dev->trans_start = jiffies;
4019 netif_start_queue(dev);
4021 /* inform generic HDLC layer of current DCD status */
4022 spin_lock_irqsave(&info->lock, flags);
4024 spin_unlock_irqrestore(&info->lock, flags);
4025 if (info->serial_signals & SerialSignal_DCD)
4026 netif_carrier_on(dev);
4028 netif_carrier_off(dev);
4033 * called by network layer when interface is disabled
4034 * shutdown hardware and release resources
4036 * dev pointer to network device structure
4038 * returns 0 if success, otherwise error code
4040 static int hdlcdev_close(struct net_device *dev)
4042 MGSLPC_INFO *info = dev_to_port(dev);
4043 struct tty_struct *tty = tty_port_tty_get(&info->port);
4044 unsigned long flags;
4046 if (debug_level >= DEBUG_LEVEL_INFO)
4047 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4049 netif_stop_queue(dev);
4051 /* shutdown adapter and release resources */
4052 shutdown(info, tty);
4056 spin_lock_irqsave(&info->netlock, flags);
4058 spin_unlock_irqrestore(&info->netlock, flags);
4064 * called by network layer to process IOCTL call to network device
4066 * dev pointer to network device structure
4067 * ifr pointer to network interface request structure
4068 * cmd IOCTL command code
4070 * returns 0 if success, otherwise error code
4072 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4074 const size_t size = sizeof(sync_serial_settings);
4075 sync_serial_settings new_line;
4076 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4077 MGSLPC_INFO *info = dev_to_port(dev);
4080 if (debug_level >= DEBUG_LEVEL_INFO)
4081 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4083 /* return error if TTY interface open */
4084 if (info->port.count)
4087 if (cmd != SIOCWANDEV)
4088 return hdlc_ioctl(dev, ifr, cmd);
4090 memset(&new_line, 0, size);
4092 switch(ifr->ifr_settings.type) {
4093 case IF_GET_IFACE: /* return current sync_serial_settings */
4095 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4096 if (ifr->ifr_settings.size < size) {
4097 ifr->ifr_settings.size = size; /* data size wanted */
4101 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4102 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4103 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4104 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4107 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4108 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4109 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4110 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4111 default: new_line.clock_type = CLOCK_DEFAULT;
4114 new_line.clock_rate = info->params.clock_speed;
4115 new_line.loopback = info->params.loopback ? 1:0;
4117 if (copy_to_user(line, &new_line, size))
4121 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4123 if(!capable(CAP_NET_ADMIN))
4125 if (copy_from_user(&new_line, line, size))
4128 switch (new_line.clock_type)
4130 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4131 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4132 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4133 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4134 case CLOCK_DEFAULT: flags = info->params.flags &
4135 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4136 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4137 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4138 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4139 default: return -EINVAL;
4142 if (new_line.loopback != 0 && new_line.loopback != 1)
4145 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4146 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4147 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4148 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4149 info->params.flags |= flags;
4151 info->params.loopback = new_line.loopback;
4153 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4154 info->params.clock_speed = new_line.clock_rate;
4156 info->params.clock_speed = 0;
4158 /* if network interface up, reprogram hardware */
4159 if (info->netcount) {
4160 struct tty_struct *tty = tty_port_tty_get(&info->port);
4161 mgslpc_program_hw(info, tty);
4167 return hdlc_ioctl(dev, ifr, cmd);
4172 * called by network layer when transmit timeout is detected
4174 * dev pointer to network device structure
4176 static void hdlcdev_tx_timeout(struct net_device *dev)
4178 MGSLPC_INFO *info = dev_to_port(dev);
4179 unsigned long flags;
4181 if (debug_level >= DEBUG_LEVEL_INFO)
4182 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4184 dev->stats.tx_errors++;
4185 dev->stats.tx_aborted_errors++;
4187 spin_lock_irqsave(&info->lock,flags);
4189 spin_unlock_irqrestore(&info->lock,flags);
4191 netif_wake_queue(dev);
4195 * called by device driver when transmit completes
4196 * reenable network layer transmit if stopped
4198 * info pointer to device instance information
4200 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4202 if (netif_queue_stopped(info->netdev))
4203 netif_wake_queue(info->netdev);
4207 * called by device driver when frame received
4208 * pass frame to network layer
4210 * info pointer to device instance information
4211 * buf pointer to buffer contianing frame data
4212 * size count of data bytes in buf
4214 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4216 struct sk_buff *skb = dev_alloc_skb(size);
4217 struct net_device *dev = info->netdev;
4219 if (debug_level >= DEBUG_LEVEL_INFO)
4220 printk("hdlcdev_rx(%s)\n",dev->name);
4223 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4224 dev->stats.rx_dropped++;
4228 memcpy(skb_put(skb, size), buf, size);
4230 skb->protocol = hdlc_type_trans(skb, dev);
4232 dev->stats.rx_packets++;
4233 dev->stats.rx_bytes += size;
4238 static const struct net_device_ops hdlcdev_ops = {
4239 .ndo_open = hdlcdev_open,
4240 .ndo_stop = hdlcdev_close,
4241 .ndo_change_mtu = hdlc_change_mtu,
4242 .ndo_start_xmit = hdlc_start_xmit,
4243 .ndo_do_ioctl = hdlcdev_ioctl,
4244 .ndo_tx_timeout = hdlcdev_tx_timeout,
4248 * called by device driver when adding device instance
4249 * do generic HDLC initialization
4251 * info pointer to device instance information
4253 * returns 0 if success, otherwise error code
4255 static int hdlcdev_init(MGSLPC_INFO *info)
4258 struct net_device *dev;
4261 /* allocate and initialize network and HDLC layer objects */
4263 if (!(dev = alloc_hdlcdev(info))) {
4264 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4268 /* for network layer reporting purposes only */
4269 dev->base_addr = info->io_base;
4270 dev->irq = info->irq_level;
4272 /* network layer callbacks and settings */
4273 dev->netdev_ops = &hdlcdev_ops;
4274 dev->watchdog_timeo = 10 * HZ;
4275 dev->tx_queue_len = 50;
4277 /* generic HDLC layer callbacks and settings */
4278 hdlc = dev_to_hdlc(dev);
4279 hdlc->attach = hdlcdev_attach;
4280 hdlc->xmit = hdlcdev_xmit;
4282 /* register objects with HDLC layer */
4283 if ((rc = register_hdlc_device(dev))) {
4284 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4294 * called by device driver when removing device instance
4295 * do generic HDLC cleanup
4297 * info pointer to device instance information
4299 static void hdlcdev_exit(MGSLPC_INFO *info)
4301 unregister_hdlc_device(info->netdev);
4302 free_netdev(info->netdev);
4303 info->netdev = NULL;
4306 #endif /* CONFIG_HDLC */