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;
771 if (debug_level >= DEBUG_LEVEL_BH)
772 printk( "%s(%d):bh_handler(%s) entry\n",
773 __FILE__,__LINE__,info->device_name);
775 info->bh_running = true;
776 tty = tty_port_tty_get(&info->port);
778 while((action = bh_action(info)) != 0) {
780 /* Process work item */
781 if ( debug_level >= DEBUG_LEVEL_BH )
782 printk( "%s(%d):bh_handler() work item action=%d\n",
783 __FILE__,__LINE__,action);
788 while(rx_get_frame(info, tty));
791 bh_transmit(info, tty);
797 /* unknown work item ID */
798 printk("Unknown work item ID=%08X!\n", action);
804 if (debug_level >= DEBUG_LEVEL_BH)
805 printk( "%s(%d):bh_handler(%s) exit\n",
806 __FILE__,__LINE__,info->device_name);
809 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
811 if (debug_level >= DEBUG_LEVEL_BH)
812 printk("bh_transmit() entry on %s\n", info->device_name);
818 static void bh_status(MGSLPC_INFO *info)
820 info->ri_chkcount = 0;
821 info->dsr_chkcount = 0;
822 info->dcd_chkcount = 0;
823 info->cts_chkcount = 0;
826 /* eom: non-zero = end of frame */
827 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
829 unsigned char data[2];
830 unsigned char fifo_count, read_count, i;
831 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
833 if (debug_level >= DEBUG_LEVEL_ISR)
834 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
836 if (!info->rx_enabled)
839 if (info->rx_frame_count >= info->rx_buf_count) {
840 /* no more free buffers */
841 issue_command(info, CHA, CMD_RXRESET);
842 info->pending_bh |= BH_RECEIVE;
843 info->rx_overflow = true;
844 info->icount.buf_overrun++;
849 /* end of frame, get FIFO count from RBCL register */
850 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
856 if (fifo_count == 1) {
858 data[0] = read_reg(info, CHA + RXFIFO);
861 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
863 fifo_count -= read_count;
864 if (!fifo_count && eom)
865 buf->status = data[--read_count];
867 for (i = 0; i < read_count; i++) {
868 if (buf->count >= info->max_frame_size) {
869 /* frame too large, reset receiver and reset current buffer */
870 issue_command(info, CHA, CMD_RXRESET);
874 *(buf->data + buf->count) = data[i];
877 } while (fifo_count);
880 info->pending_bh |= BH_RECEIVE;
881 info->rx_frame_count++;
883 if (info->rx_put >= info->rx_buf_count)
886 issue_command(info, CHA, CMD_RXFIFO);
889 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
891 struct tty_port *port = &info->port;
892 unsigned char data, status, flag;
895 struct mgsl_icount *icount = &info->icount;
898 /* tty is not available anymore */
899 issue_command(info, CHA, CMD_RXRESET);
900 if (debug_level >= DEBUG_LEVEL_ISR)
901 printk("%s(%d):rx_ready_async(tty=NULL)\n",__FILE__,__LINE__);
906 /* early termination, get FIFO count from RBCL register */
907 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
909 /* Zero fifo count could mean 0 or 32 bytes available.
910 * If BIT5 of STAR is set then at least 1 byte is available.
912 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
917 tty_buffer_request_room(port, fifo_count);
918 /* Flush received async data to receive data buffer. */
920 data = read_reg(info, CHA + RXFIFO);
921 status = read_reg(info, CHA + RXFIFO);
927 // if no frameing/crc error then save data
929 // BIT6:framing error
931 if (status & (BIT7 + BIT6)) {
937 /* discard char if tty control flags say so */
938 if (status & info->ignore_status_mask)
941 status &= info->read_status_mask;
945 else if (status & BIT6)
948 work += tty_insert_flip_char(port, data, flag);
950 issue_command(info, CHA, CMD_RXFIFO);
952 if (debug_level >= DEBUG_LEVEL_ISR) {
953 printk("%s(%d):rx_ready_async",
955 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
956 __FILE__,__LINE__,icount->rx,icount->brk,
957 icount->parity,icount->frame,icount->overrun);
961 tty_flip_buffer_push(tty);
965 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
967 if (!info->tx_active)
970 info->tx_active = false;
971 info->tx_aborting = false;
973 if (info->params.mode == MGSL_MODE_ASYNC)
976 info->tx_count = info->tx_put = info->tx_get = 0;
977 del_timer(&info->tx_timer);
979 if (info->drop_rts_on_tx_done) {
981 if (info->serial_signals & SerialSignal_RTS) {
982 info->serial_signals &= ~SerialSignal_RTS;
985 info->drop_rts_on_tx_done = false;
988 #if SYNCLINK_GENERIC_HDLC
990 hdlcdev_tx_done(info);
994 if (tty && (tty->stopped || tty->hw_stopped)) {
998 info->pending_bh |= BH_TRANSMIT;
1002 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1004 unsigned char fifo_count = 32;
1007 if (debug_level >= DEBUG_LEVEL_ISR)
1008 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1010 if (info->params.mode == MGSL_MODE_HDLC) {
1011 if (!info->tx_active)
1014 if (tty && (tty->stopped || tty->hw_stopped)) {
1018 if (!info->tx_count)
1019 info->tx_active = false;
1022 if (!info->tx_count)
1025 while (info->tx_count && fifo_count) {
1026 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1029 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1031 write_reg16(info, CHA + TXFIFO,
1032 *((unsigned short*)(info->tx_buf + info->tx_get)));
1034 info->tx_count -= c;
1035 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1039 if (info->params.mode == MGSL_MODE_ASYNC) {
1040 if (info->tx_count < WAKEUP_CHARS)
1041 info->pending_bh |= BH_TRANSMIT;
1042 issue_command(info, CHA, CMD_TXFIFO);
1045 issue_command(info, CHA, CMD_TXFIFO);
1047 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1051 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1054 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1055 irq_disable(info, CHB, IRQ_CTS);
1057 if (info->serial_signals & SerialSignal_CTS)
1058 info->input_signal_events.cts_up++;
1060 info->input_signal_events.cts_down++;
1061 wake_up_interruptible(&info->status_event_wait_q);
1062 wake_up_interruptible(&info->event_wait_q);
1064 if (tty && tty_port_cts_enabled(&info->port)) {
1065 if (tty->hw_stopped) {
1066 if (info->serial_signals & SerialSignal_CTS) {
1067 if (debug_level >= DEBUG_LEVEL_ISR)
1068 printk("CTS tx start...");
1069 tty->hw_stopped = 0;
1070 tx_start(info, tty);
1071 info->pending_bh |= BH_TRANSMIT;
1075 if (!(info->serial_signals & SerialSignal_CTS)) {
1076 if (debug_level >= DEBUG_LEVEL_ISR)
1077 printk("CTS tx stop...");
1078 tty->hw_stopped = 1;
1083 info->pending_bh |= BH_STATUS;
1086 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1089 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1090 irq_disable(info, CHB, IRQ_DCD);
1092 if (info->serial_signals & SerialSignal_DCD) {
1093 info->input_signal_events.dcd_up++;
1096 info->input_signal_events.dcd_down++;
1097 #if SYNCLINK_GENERIC_HDLC
1098 if (info->netcount) {
1099 if (info->serial_signals & SerialSignal_DCD)
1100 netif_carrier_on(info->netdev);
1102 netif_carrier_off(info->netdev);
1105 wake_up_interruptible(&info->status_event_wait_q);
1106 wake_up_interruptible(&info->event_wait_q);
1108 if (info->port.flags & ASYNC_CHECK_CD) {
1109 if (debug_level >= DEBUG_LEVEL_ISR)
1110 printk("%s CD now %s...", info->device_name,
1111 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1112 if (info->serial_signals & SerialSignal_DCD)
1113 wake_up_interruptible(&info->port.open_wait);
1115 if (debug_level >= DEBUG_LEVEL_ISR)
1116 printk("doing serial hangup...");
1121 info->pending_bh |= BH_STATUS;
1124 static void dsr_change(MGSLPC_INFO *info)
1127 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1128 port_irq_disable(info, PVR_DSR);
1130 if (info->serial_signals & SerialSignal_DSR)
1131 info->input_signal_events.dsr_up++;
1133 info->input_signal_events.dsr_down++;
1134 wake_up_interruptible(&info->status_event_wait_q);
1135 wake_up_interruptible(&info->event_wait_q);
1136 info->pending_bh |= BH_STATUS;
1139 static void ri_change(MGSLPC_INFO *info)
1142 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1143 port_irq_disable(info, PVR_RI);
1145 if (info->serial_signals & SerialSignal_RI)
1146 info->input_signal_events.ri_up++;
1148 info->input_signal_events.ri_down++;
1149 wake_up_interruptible(&info->status_event_wait_q);
1150 wake_up_interruptible(&info->event_wait_q);
1151 info->pending_bh |= BH_STATUS;
1154 /* Interrupt service routine entry point.
1158 * irq interrupt number that caused interrupt
1159 * dev_id device ID supplied during interrupt registration
1161 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1163 MGSLPC_INFO *info = dev_id;
1164 struct tty_struct *tty;
1166 unsigned char gis, pis;
1169 if (debug_level >= DEBUG_LEVEL_ISR)
1170 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1172 if (!(info->p_dev->_locked))
1175 tty = tty_port_tty_get(&info->port);
1177 spin_lock(&info->lock);
1179 while ((gis = read_reg(info, CHA + GIS))) {
1180 if (debug_level >= DEBUG_LEVEL_ISR)
1181 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1183 if ((gis & 0x70) || count > 1000) {
1184 printk("synclink_cs:hardware failed or ejected\n");
1189 if (gis & (BIT1 + BIT0)) {
1190 isr = read_reg16(info, CHB + ISR);
1192 dcd_change(info, tty);
1194 cts_change(info, tty);
1196 if (gis & (BIT3 + BIT2))
1198 isr = read_reg16(info, CHA + ISR);
1199 if (isr & IRQ_TIMER) {
1200 info->irq_occurred = true;
1201 irq_disable(info, CHA, IRQ_TIMER);
1205 if (isr & IRQ_EXITHUNT) {
1206 info->icount.exithunt++;
1207 wake_up_interruptible(&info->event_wait_q);
1209 if (isr & IRQ_BREAK_ON) {
1211 if (info->port.flags & ASYNC_SAK)
1214 if (isr & IRQ_RXTIME) {
1215 issue_command(info, CHA, CMD_RXFIFO_READ);
1217 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1218 if (info->params.mode == MGSL_MODE_HDLC)
1219 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1221 rx_ready_async(info, isr & IRQ_RXEOM, tty);
1225 if (isr & IRQ_UNDERRUN) {
1226 if (info->tx_aborting)
1227 info->icount.txabort++;
1229 info->icount.txunder++;
1232 else if (isr & IRQ_ALLSENT) {
1233 info->icount.txok++;
1236 else if (isr & IRQ_TXFIFO)
1237 tx_ready(info, tty);
1240 pis = read_reg(info, CHA + PIS);
1248 /* Request bottom half processing if there's something
1249 * for it to do and the bh is not already running
1252 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1253 if ( debug_level >= DEBUG_LEVEL_ISR )
1254 printk("%s(%d):%s queueing bh task.\n",
1255 __FILE__,__LINE__,info->device_name);
1256 schedule_work(&info->task);
1257 info->bh_requested = true;
1260 spin_unlock(&info->lock);
1263 if (debug_level >= DEBUG_LEVEL_ISR)
1264 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1265 __FILE__, __LINE__, info->irq_level);
1270 /* Initialize and start device.
1272 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1276 if (debug_level >= DEBUG_LEVEL_INFO)
1277 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1279 if (info->port.flags & ASYNC_INITIALIZED)
1282 if (!info->tx_buf) {
1283 /* allocate a page of memory for a transmit buffer */
1284 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1285 if (!info->tx_buf) {
1286 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1287 __FILE__,__LINE__,info->device_name);
1292 info->pending_bh = 0;
1294 memset(&info->icount, 0, sizeof(info->icount));
1296 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1298 /* Allocate and claim adapter resources */
1299 retval = claim_resources(info);
1301 /* perform existence check and diagnostics */
1303 retval = adapter_test(info);
1306 if (capable(CAP_SYS_ADMIN) && tty)
1307 set_bit(TTY_IO_ERROR, &tty->flags);
1308 release_resources(info);
1312 /* program hardware for current parameters */
1313 mgslpc_change_params(info, tty);
1316 clear_bit(TTY_IO_ERROR, &tty->flags);
1318 info->port.flags |= ASYNC_INITIALIZED;
1323 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1325 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1327 unsigned long flags;
1329 if (!(info->port.flags & ASYNC_INITIALIZED))
1332 if (debug_level >= DEBUG_LEVEL_INFO)
1333 printk("%s(%d):mgslpc_shutdown(%s)\n",
1334 __FILE__,__LINE__, info->device_name );
1336 /* clear status wait queue because status changes */
1337 /* can't happen after shutting down the hardware */
1338 wake_up_interruptible(&info->status_event_wait_q);
1339 wake_up_interruptible(&info->event_wait_q);
1341 del_timer_sync(&info->tx_timer);
1344 free_page((unsigned long) info->tx_buf);
1345 info->tx_buf = NULL;
1348 spin_lock_irqsave(&info->lock,flags);
1353 /* TODO:disable interrupts instead of reset to preserve signal states */
1356 if (!tty || tty->termios.c_cflag & HUPCL) {
1357 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1361 spin_unlock_irqrestore(&info->lock,flags);
1363 release_resources(info);
1366 set_bit(TTY_IO_ERROR, &tty->flags);
1368 info->port.flags &= ~ASYNC_INITIALIZED;
1371 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1373 unsigned long flags;
1375 spin_lock_irqsave(&info->lock,flags);
1379 info->tx_count = info->tx_put = info->tx_get = 0;
1381 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1388 info->dcd_chkcount = 0;
1389 info->cts_chkcount = 0;
1390 info->ri_chkcount = 0;
1391 info->dsr_chkcount = 0;
1393 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1394 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1397 if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1400 spin_unlock_irqrestore(&info->lock,flags);
1403 /* Reconfigure adapter based on new parameters
1405 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1413 if (debug_level >= DEBUG_LEVEL_INFO)
1414 printk("%s(%d):mgslpc_change_params(%s)\n",
1415 __FILE__,__LINE__, info->device_name );
1417 cflag = tty->termios.c_cflag;
1419 /* if B0 rate (hangup) specified then negate DTR and RTS */
1420 /* otherwise assert DTR and RTS */
1422 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1424 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1426 /* byte size and parity */
1428 switch (cflag & CSIZE) {
1429 case CS5: info->params.data_bits = 5; break;
1430 case CS6: info->params.data_bits = 6; break;
1431 case CS7: info->params.data_bits = 7; break;
1432 case CS8: info->params.data_bits = 8; break;
1433 default: info->params.data_bits = 7; break;
1437 info->params.stop_bits = 2;
1439 info->params.stop_bits = 1;
1441 info->params.parity = ASYNC_PARITY_NONE;
1442 if (cflag & PARENB) {
1444 info->params.parity = ASYNC_PARITY_ODD;
1446 info->params.parity = ASYNC_PARITY_EVEN;
1449 info->params.parity = ASYNC_PARITY_SPACE;
1453 /* calculate number of jiffies to transmit a full
1454 * FIFO (32 bytes) at specified data rate
1456 bits_per_char = info->params.data_bits +
1457 info->params.stop_bits + 1;
1459 /* if port data rate is set to 460800 or less then
1460 * allow tty settings to override, otherwise keep the
1461 * current data rate.
1463 if (info->params.data_rate <= 460800) {
1464 info->params.data_rate = tty_get_baud_rate(tty);
1467 if ( info->params.data_rate ) {
1468 info->timeout = (32*HZ*bits_per_char) /
1469 info->params.data_rate;
1471 info->timeout += HZ/50; /* Add .02 seconds of slop */
1473 if (cflag & CRTSCTS)
1474 info->port.flags |= ASYNC_CTS_FLOW;
1476 info->port.flags &= ~ASYNC_CTS_FLOW;
1479 info->port.flags &= ~ASYNC_CHECK_CD;
1481 info->port.flags |= ASYNC_CHECK_CD;
1483 /* process tty input control flags */
1485 info->read_status_mask = 0;
1487 info->read_status_mask |= BIT7 | BIT6;
1489 info->ignore_status_mask |= BIT7 | BIT6;
1491 mgslpc_program_hw(info, tty);
1494 /* Add a character to the transmit buffer
1496 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1498 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1499 unsigned long flags;
1501 if (debug_level >= DEBUG_LEVEL_INFO) {
1502 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1503 __FILE__,__LINE__,ch,info->device_name);
1506 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1512 spin_lock_irqsave(&info->lock,flags);
1514 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1515 if (info->tx_count < TXBUFSIZE - 1) {
1516 info->tx_buf[info->tx_put++] = ch;
1517 info->tx_put &= TXBUFSIZE-1;
1522 spin_unlock_irqrestore(&info->lock,flags);
1526 /* Enable transmitter so remaining characters in the
1527 * transmit buffer are sent.
1529 static void mgslpc_flush_chars(struct tty_struct *tty)
1531 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1532 unsigned long flags;
1534 if (debug_level >= DEBUG_LEVEL_INFO)
1535 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1536 __FILE__,__LINE__,info->device_name,info->tx_count);
1538 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1541 if (info->tx_count <= 0 || tty->stopped ||
1542 tty->hw_stopped || !info->tx_buf)
1545 if (debug_level >= DEBUG_LEVEL_INFO)
1546 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1547 __FILE__,__LINE__,info->device_name);
1549 spin_lock_irqsave(&info->lock,flags);
1550 if (!info->tx_active)
1551 tx_start(info, tty);
1552 spin_unlock_irqrestore(&info->lock,flags);
1555 /* Send a block of data
1559 * tty pointer to tty information structure
1560 * buf pointer to buffer containing send data
1561 * count size of send data in bytes
1563 * Returns: number of characters written
1565 static int mgslpc_write(struct tty_struct * tty,
1566 const unsigned char *buf, int count)
1569 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1570 unsigned long flags;
1572 if (debug_level >= DEBUG_LEVEL_INFO)
1573 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1574 __FILE__,__LINE__,info->device_name,count);
1576 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1580 if (info->params.mode == MGSL_MODE_HDLC) {
1581 if (count > TXBUFSIZE) {
1585 if (info->tx_active)
1587 else if (info->tx_count)
1593 min(TXBUFSIZE - info->tx_count - 1,
1594 TXBUFSIZE - info->tx_put));
1598 memcpy(info->tx_buf + info->tx_put, buf, c);
1600 spin_lock_irqsave(&info->lock,flags);
1601 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1602 info->tx_count += c;
1603 spin_unlock_irqrestore(&info->lock,flags);
1610 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1611 spin_lock_irqsave(&info->lock,flags);
1612 if (!info->tx_active)
1613 tx_start(info, tty);
1614 spin_unlock_irqrestore(&info->lock,flags);
1617 if (debug_level >= DEBUG_LEVEL_INFO)
1618 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1619 __FILE__,__LINE__,info->device_name,ret);
1623 /* Return the count of free bytes in transmit buffer
1625 static int mgslpc_write_room(struct tty_struct *tty)
1627 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1630 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1633 if (info->params.mode == MGSL_MODE_HDLC) {
1634 /* HDLC (frame oriented) mode */
1635 if (info->tx_active)
1638 return HDLC_MAX_FRAME_SIZE;
1640 ret = TXBUFSIZE - info->tx_count - 1;
1645 if (debug_level >= DEBUG_LEVEL_INFO)
1646 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1647 __FILE__,__LINE__, info->device_name, ret);
1651 /* Return the count of bytes in transmit buffer
1653 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1655 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1658 if (debug_level >= DEBUG_LEVEL_INFO)
1659 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1660 __FILE__,__LINE__, info->device_name );
1662 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1665 if (info->params.mode == MGSL_MODE_HDLC)
1666 rc = info->tx_active ? info->max_frame_size : 0;
1668 rc = info->tx_count;
1670 if (debug_level >= DEBUG_LEVEL_INFO)
1671 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1672 __FILE__,__LINE__, info->device_name, rc);
1677 /* Discard all data in the send buffer
1679 static void mgslpc_flush_buffer(struct tty_struct *tty)
1681 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1682 unsigned long flags;
1684 if (debug_level >= DEBUG_LEVEL_INFO)
1685 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1686 __FILE__,__LINE__, info->device_name );
1688 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1691 spin_lock_irqsave(&info->lock,flags);
1692 info->tx_count = info->tx_put = info->tx_get = 0;
1693 del_timer(&info->tx_timer);
1694 spin_unlock_irqrestore(&info->lock,flags);
1696 wake_up_interruptible(&tty->write_wait);
1700 /* Send a high-priority XON/XOFF character
1702 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1704 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1705 unsigned long flags;
1707 if (debug_level >= DEBUG_LEVEL_INFO)
1708 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1709 __FILE__,__LINE__, info->device_name, ch );
1711 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1716 spin_lock_irqsave(&info->lock,flags);
1717 if (!info->tx_enabled)
1718 tx_start(info, tty);
1719 spin_unlock_irqrestore(&info->lock,flags);
1723 /* Signal remote device to throttle send data (our receive data)
1725 static void mgslpc_throttle(struct tty_struct * tty)
1727 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1728 unsigned long flags;
1730 if (debug_level >= DEBUG_LEVEL_INFO)
1731 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1732 __FILE__,__LINE__, info->device_name );
1734 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1738 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1740 if (tty->termios.c_cflag & CRTSCTS) {
1741 spin_lock_irqsave(&info->lock,flags);
1742 info->serial_signals &= ~SerialSignal_RTS;
1744 spin_unlock_irqrestore(&info->lock,flags);
1748 /* Signal remote device to stop throttling send data (our receive data)
1750 static void mgslpc_unthrottle(struct tty_struct * tty)
1752 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1753 unsigned long flags;
1755 if (debug_level >= DEBUG_LEVEL_INFO)
1756 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1757 __FILE__,__LINE__, info->device_name );
1759 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1766 mgslpc_send_xchar(tty, START_CHAR(tty));
1769 if (tty->termios.c_cflag & CRTSCTS) {
1770 spin_lock_irqsave(&info->lock,flags);
1771 info->serial_signals |= SerialSignal_RTS;
1773 spin_unlock_irqrestore(&info->lock,flags);
1777 /* get the current serial statistics
1779 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1782 if (debug_level >= DEBUG_LEVEL_INFO)
1783 printk("get_params(%s)\n", info->device_name);
1785 memset(&info->icount, 0, sizeof(info->icount));
1787 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1794 /* get the current serial parameters
1796 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1799 if (debug_level >= DEBUG_LEVEL_INFO)
1800 printk("get_params(%s)\n", info->device_name);
1801 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1807 /* set the serial parameters
1811 * info pointer to device instance data
1812 * new_params user buffer containing new serial params
1814 * Returns: 0 if success, otherwise error code
1816 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1818 unsigned long flags;
1819 MGSL_PARAMS tmp_params;
1822 if (debug_level >= DEBUG_LEVEL_INFO)
1823 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1824 info->device_name );
1825 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1827 if ( debug_level >= DEBUG_LEVEL_INFO )
1828 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1829 __FILE__,__LINE__,info->device_name);
1833 spin_lock_irqsave(&info->lock,flags);
1834 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1835 spin_unlock_irqrestore(&info->lock,flags);
1837 mgslpc_change_params(info, tty);
1842 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1845 if (debug_level >= DEBUG_LEVEL_INFO)
1846 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1847 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1853 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1855 unsigned long flags;
1856 if (debug_level >= DEBUG_LEVEL_INFO)
1857 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1858 spin_lock_irqsave(&info->lock,flags);
1859 info->idle_mode = idle_mode;
1861 spin_unlock_irqrestore(&info->lock,flags);
1865 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1868 if (debug_level >= DEBUG_LEVEL_INFO)
1869 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1870 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1876 static int set_interface(MGSLPC_INFO * info, int if_mode)
1878 unsigned long flags;
1880 if (debug_level >= DEBUG_LEVEL_INFO)
1881 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1882 spin_lock_irqsave(&info->lock,flags);
1883 info->if_mode = if_mode;
1885 val = read_reg(info, PVR) & 0x0f;
1886 switch (info->if_mode)
1888 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1889 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1890 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1892 write_reg(info, PVR, val);
1894 spin_unlock_irqrestore(&info->lock,flags);
1898 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1900 unsigned long flags;
1902 if (debug_level >= DEBUG_LEVEL_INFO)
1903 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1905 spin_lock_irqsave(&info->lock,flags);
1907 if (!info->tx_enabled)
1908 tx_start(info, tty);
1910 if (info->tx_enabled)
1913 spin_unlock_irqrestore(&info->lock,flags);
1917 static int tx_abort(MGSLPC_INFO * info)
1919 unsigned long flags;
1921 if (debug_level >= DEBUG_LEVEL_INFO)
1922 printk("tx_abort(%s)\n", info->device_name);
1924 spin_lock_irqsave(&info->lock,flags);
1925 if (info->tx_active && info->tx_count &&
1926 info->params.mode == MGSL_MODE_HDLC) {
1927 /* clear data count so FIFO is not filled on next IRQ.
1928 * This results in underrun and abort transmission.
1930 info->tx_count = info->tx_put = info->tx_get = 0;
1931 info->tx_aborting = true;
1933 spin_unlock_irqrestore(&info->lock,flags);
1937 static int set_rxenable(MGSLPC_INFO * info, int enable)
1939 unsigned long flags;
1941 if (debug_level >= DEBUG_LEVEL_INFO)
1942 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1944 spin_lock_irqsave(&info->lock,flags);
1946 if (!info->rx_enabled)
1949 if (info->rx_enabled)
1952 spin_unlock_irqrestore(&info->lock,flags);
1956 /* wait for specified event to occur
1958 * Arguments: info pointer to device instance data
1959 * mask pointer to bitmask of events to wait for
1960 * Return Value: 0 if successful and bit mask updated with
1961 * of events triggerred,
1962 * otherwise error code
1964 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1966 unsigned long flags;
1969 struct mgsl_icount cprev, cnow;
1972 struct _input_signal_events oldsigs, newsigs;
1973 DECLARE_WAITQUEUE(wait, current);
1975 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1979 if (debug_level >= DEBUG_LEVEL_INFO)
1980 printk("wait_events(%s,%d)\n", info->device_name, mask);
1982 spin_lock_irqsave(&info->lock,flags);
1984 /* return immediately if state matches requested events */
1986 s = info->serial_signals;
1988 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1989 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1990 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1991 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1993 spin_unlock_irqrestore(&info->lock,flags);
1997 /* save current irq counts */
1998 cprev = info->icount;
1999 oldsigs = info->input_signal_events;
2001 if ((info->params.mode == MGSL_MODE_HDLC) &&
2002 (mask & MgslEvent_ExitHuntMode))
2003 irq_enable(info, CHA, IRQ_EXITHUNT);
2005 set_current_state(TASK_INTERRUPTIBLE);
2006 add_wait_queue(&info->event_wait_q, &wait);
2008 spin_unlock_irqrestore(&info->lock,flags);
2013 if (signal_pending(current)) {
2018 /* get current irq counts */
2019 spin_lock_irqsave(&info->lock,flags);
2020 cnow = info->icount;
2021 newsigs = info->input_signal_events;
2022 set_current_state(TASK_INTERRUPTIBLE);
2023 spin_unlock_irqrestore(&info->lock,flags);
2025 /* if no change, wait aborted for some reason */
2026 if (newsigs.dsr_up == oldsigs.dsr_up &&
2027 newsigs.dsr_down == oldsigs.dsr_down &&
2028 newsigs.dcd_up == oldsigs.dcd_up &&
2029 newsigs.dcd_down == oldsigs.dcd_down &&
2030 newsigs.cts_up == oldsigs.cts_up &&
2031 newsigs.cts_down == oldsigs.cts_down &&
2032 newsigs.ri_up == oldsigs.ri_up &&
2033 newsigs.ri_down == oldsigs.ri_down &&
2034 cnow.exithunt == cprev.exithunt &&
2035 cnow.rxidle == cprev.rxidle) {
2041 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2042 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2043 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2044 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2045 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2046 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2047 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2048 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2049 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2050 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2058 remove_wait_queue(&info->event_wait_q, &wait);
2059 set_current_state(TASK_RUNNING);
2061 if (mask & MgslEvent_ExitHuntMode) {
2062 spin_lock_irqsave(&info->lock,flags);
2063 if (!waitqueue_active(&info->event_wait_q))
2064 irq_disable(info, CHA, IRQ_EXITHUNT);
2065 spin_unlock_irqrestore(&info->lock,flags);
2069 PUT_USER(rc, events, mask_ptr);
2073 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2075 unsigned long flags;
2077 struct mgsl_icount cprev, cnow;
2078 DECLARE_WAITQUEUE(wait, current);
2080 /* save current irq counts */
2081 spin_lock_irqsave(&info->lock,flags);
2082 cprev = info->icount;
2083 add_wait_queue(&info->status_event_wait_q, &wait);
2084 set_current_state(TASK_INTERRUPTIBLE);
2085 spin_unlock_irqrestore(&info->lock,flags);
2089 if (signal_pending(current)) {
2094 /* get new irq counts */
2095 spin_lock_irqsave(&info->lock,flags);
2096 cnow = info->icount;
2097 set_current_state(TASK_INTERRUPTIBLE);
2098 spin_unlock_irqrestore(&info->lock,flags);
2100 /* if no change, wait aborted for some reason */
2101 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2102 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2107 /* check for change in caller specified modem input */
2108 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2109 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2110 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2111 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2118 remove_wait_queue(&info->status_event_wait_q, &wait);
2119 set_current_state(TASK_RUNNING);
2123 /* return the state of the serial control and status signals
2125 static int tiocmget(struct tty_struct *tty)
2127 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2128 unsigned int result;
2129 unsigned long flags;
2131 spin_lock_irqsave(&info->lock,flags);
2133 spin_unlock_irqrestore(&info->lock,flags);
2135 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2136 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2137 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2138 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2139 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2140 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2142 if (debug_level >= DEBUG_LEVEL_INFO)
2143 printk("%s(%d):%s tiocmget() value=%08X\n",
2144 __FILE__,__LINE__, info->device_name, result );
2148 /* set modem control signals (DTR/RTS)
2150 static int tiocmset(struct tty_struct *tty,
2151 unsigned int set, unsigned int clear)
2153 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2154 unsigned long flags;
2156 if (debug_level >= DEBUG_LEVEL_INFO)
2157 printk("%s(%d):%s tiocmset(%x,%x)\n",
2158 __FILE__,__LINE__,info->device_name, set, clear);
2160 if (set & TIOCM_RTS)
2161 info->serial_signals |= SerialSignal_RTS;
2162 if (set & TIOCM_DTR)
2163 info->serial_signals |= SerialSignal_DTR;
2164 if (clear & TIOCM_RTS)
2165 info->serial_signals &= ~SerialSignal_RTS;
2166 if (clear & TIOCM_DTR)
2167 info->serial_signals &= ~SerialSignal_DTR;
2169 spin_lock_irqsave(&info->lock,flags);
2171 spin_unlock_irqrestore(&info->lock,flags);
2176 /* Set or clear transmit break condition
2178 * Arguments: tty pointer to tty instance data
2179 * break_state -1=set break condition, 0=clear
2181 static int mgslpc_break(struct tty_struct *tty, int break_state)
2183 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2184 unsigned long flags;
2186 if (debug_level >= DEBUG_LEVEL_INFO)
2187 printk("%s(%d):mgslpc_break(%s,%d)\n",
2188 __FILE__,__LINE__, info->device_name, break_state);
2190 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2193 spin_lock_irqsave(&info->lock,flags);
2194 if (break_state == -1)
2195 set_reg_bits(info, CHA+DAFO, BIT6);
2197 clear_reg_bits(info, CHA+DAFO, BIT6);
2198 spin_unlock_irqrestore(&info->lock,flags);
2202 static int mgslpc_get_icount(struct tty_struct *tty,
2203 struct serial_icounter_struct *icount)
2205 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2206 struct mgsl_icount cnow; /* kernel counter temps */
2207 unsigned long flags;
2209 spin_lock_irqsave(&info->lock,flags);
2210 cnow = info->icount;
2211 spin_unlock_irqrestore(&info->lock,flags);
2213 icount->cts = cnow.cts;
2214 icount->dsr = cnow.dsr;
2215 icount->rng = cnow.rng;
2216 icount->dcd = cnow.dcd;
2217 icount->rx = cnow.rx;
2218 icount->tx = cnow.tx;
2219 icount->frame = cnow.frame;
2220 icount->overrun = cnow.overrun;
2221 icount->parity = cnow.parity;
2222 icount->brk = cnow.brk;
2223 icount->buf_overrun = cnow.buf_overrun;
2228 /* Service an IOCTL request
2232 * tty pointer to tty instance data
2233 * cmd IOCTL command code
2234 * arg command argument/context
2236 * Return Value: 0 if success, otherwise error code
2238 static int mgslpc_ioctl(struct tty_struct *tty,
2239 unsigned int cmd, unsigned long arg)
2241 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2242 void __user *argp = (void __user *)arg;
2244 if (debug_level >= DEBUG_LEVEL_INFO)
2245 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2246 info->device_name, cmd );
2248 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2251 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2252 (cmd != TIOCMIWAIT)) {
2253 if (tty->flags & (1 << TTY_IO_ERROR))
2258 case MGSL_IOCGPARAMS:
2259 return get_params(info, argp);
2260 case MGSL_IOCSPARAMS:
2261 return set_params(info, argp, tty);
2262 case MGSL_IOCGTXIDLE:
2263 return get_txidle(info, argp);
2264 case MGSL_IOCSTXIDLE:
2265 return set_txidle(info, (int)arg);
2267 return get_interface(info, argp);
2269 return set_interface(info,(int)arg);
2270 case MGSL_IOCTXENABLE:
2271 return set_txenable(info,(int)arg, tty);
2272 case MGSL_IOCRXENABLE:
2273 return set_rxenable(info,(int)arg);
2274 case MGSL_IOCTXABORT:
2275 return tx_abort(info);
2276 case MGSL_IOCGSTATS:
2277 return get_stats(info, argp);
2278 case MGSL_IOCWAITEVENT:
2279 return wait_events(info, argp);
2281 return modem_input_wait(info,(int)arg);
2283 return -ENOIOCTLCMD;
2288 /* Set new termios settings
2292 * tty pointer to tty structure
2293 * termios pointer to buffer to hold returned old termios
2295 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2297 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2298 unsigned long flags;
2300 if (debug_level >= DEBUG_LEVEL_INFO)
2301 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2302 tty->driver->name );
2304 /* just return if nothing has changed */
2305 if ((tty->termios.c_cflag == old_termios->c_cflag)
2306 && (RELEVANT_IFLAG(tty->termios.c_iflag)
2307 == RELEVANT_IFLAG(old_termios->c_iflag)))
2310 mgslpc_change_params(info, tty);
2312 /* Handle transition to B0 status */
2313 if (old_termios->c_cflag & CBAUD &&
2314 !(tty->termios.c_cflag & CBAUD)) {
2315 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2316 spin_lock_irqsave(&info->lock,flags);
2318 spin_unlock_irqrestore(&info->lock,flags);
2321 /* Handle transition away from B0 status */
2322 if (!(old_termios->c_cflag & CBAUD) &&
2323 tty->termios.c_cflag & CBAUD) {
2324 info->serial_signals |= SerialSignal_DTR;
2325 if (!(tty->termios.c_cflag & CRTSCTS) ||
2326 !test_bit(TTY_THROTTLED, &tty->flags)) {
2327 info->serial_signals |= SerialSignal_RTS;
2329 spin_lock_irqsave(&info->lock,flags);
2331 spin_unlock_irqrestore(&info->lock,flags);
2334 /* Handle turning off CRTSCTS */
2335 if (old_termios->c_cflag & CRTSCTS &&
2336 !(tty->termios.c_cflag & CRTSCTS)) {
2337 tty->hw_stopped = 0;
2342 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2344 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2345 struct tty_port *port = &info->port;
2347 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2350 if (debug_level >= DEBUG_LEVEL_INFO)
2351 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2352 __FILE__,__LINE__, info->device_name, port->count);
2354 WARN_ON(!port->count);
2356 if (tty_port_close_start(port, tty, filp) == 0)
2359 if (port->flags & ASYNC_INITIALIZED)
2360 mgslpc_wait_until_sent(tty, info->timeout);
2362 mgslpc_flush_buffer(tty);
2364 tty_ldisc_flush(tty);
2365 shutdown(info, tty);
2367 tty_port_close_end(port, tty);
2368 tty_port_tty_set(port, NULL);
2370 if (debug_level >= DEBUG_LEVEL_INFO)
2371 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2372 tty->driver->name, port->count);
2375 /* Wait until the transmitter is empty.
2377 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2379 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2380 unsigned long orig_jiffies, char_time;
2385 if (debug_level >= DEBUG_LEVEL_INFO)
2386 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2387 __FILE__,__LINE__, info->device_name );
2389 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2392 if (!(info->port.flags & ASYNC_INITIALIZED))
2395 orig_jiffies = jiffies;
2397 /* Set check interval to 1/5 of estimated time to
2398 * send a character, and make it at least 1. The check
2399 * interval should also be less than the timeout.
2400 * Note: use tight timings here to satisfy the NIST-PCTS.
2403 if ( info->params.data_rate ) {
2404 char_time = info->timeout/(32 * 5);
2411 char_time = min_t(unsigned long, char_time, timeout);
2413 if (info->params.mode == MGSL_MODE_HDLC) {
2414 while (info->tx_active) {
2415 msleep_interruptible(jiffies_to_msecs(char_time));
2416 if (signal_pending(current))
2418 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2422 while ((info->tx_count || info->tx_active) &&
2424 msleep_interruptible(jiffies_to_msecs(char_time));
2425 if (signal_pending(current))
2427 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2433 if (debug_level >= DEBUG_LEVEL_INFO)
2434 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2435 __FILE__,__LINE__, info->device_name );
2438 /* Called by tty_hangup() when a hangup is signaled.
2439 * This is the same as closing all open files for the port.
2441 static void mgslpc_hangup(struct tty_struct *tty)
2443 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2445 if (debug_level >= DEBUG_LEVEL_INFO)
2446 printk("%s(%d):mgslpc_hangup(%s)\n",
2447 __FILE__,__LINE__, info->device_name );
2449 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2452 mgslpc_flush_buffer(tty);
2453 shutdown(info, tty);
2454 tty_port_hangup(&info->port);
2457 static int carrier_raised(struct tty_port *port)
2459 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2460 unsigned long flags;
2462 spin_lock_irqsave(&info->lock,flags);
2464 spin_unlock_irqrestore(&info->lock,flags);
2466 if (info->serial_signals & SerialSignal_DCD)
2471 static void dtr_rts(struct tty_port *port, int onoff)
2473 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2474 unsigned long flags;
2476 spin_lock_irqsave(&info->lock,flags);
2478 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2480 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2482 spin_unlock_irqrestore(&info->lock,flags);
2486 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2489 struct tty_port *port;
2491 unsigned long flags;
2493 /* verify range of specified line number */
2495 if (line >= mgslpc_device_count) {
2496 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2497 __FILE__,__LINE__,line);
2501 /* find the info structure for the specified line */
2502 info = mgslpc_device_list;
2503 while(info && info->line != line)
2504 info = info->next_device;
2505 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2509 tty->driver_data = info;
2510 tty_port_tty_set(port, tty);
2512 if (debug_level >= DEBUG_LEVEL_INFO)
2513 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2514 __FILE__,__LINE__,tty->driver->name, port->count);
2516 /* If port is closing, signal caller to try again */
2517 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2518 if (port->flags & ASYNC_CLOSING)
2519 interruptible_sleep_on(&port->close_wait);
2520 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2521 -EAGAIN : -ERESTARTSYS);
2525 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2527 spin_lock_irqsave(&info->netlock, flags);
2528 if (info->netcount) {
2530 spin_unlock_irqrestore(&info->netlock, flags);
2533 spin_lock(&port->lock);
2535 spin_unlock(&port->lock);
2536 spin_unlock_irqrestore(&info->netlock, flags);
2538 if (port->count == 1) {
2539 /* 1st open on this device, init hardware */
2540 retval = startup(info, tty);
2545 retval = tty_port_block_til_ready(&info->port, tty, filp);
2547 if (debug_level >= DEBUG_LEVEL_INFO)
2548 printk("%s(%d):block_til_ready(%s) returned %d\n",
2549 __FILE__,__LINE__, info->device_name, retval);
2553 if (debug_level >= DEBUG_LEVEL_INFO)
2554 printk("%s(%d):mgslpc_open(%s) success\n",
2555 __FILE__,__LINE__, info->device_name);
2563 * /proc fs routines....
2566 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2569 unsigned long flags;
2571 seq_printf(m, "%s:io:%04X irq:%d",
2572 info->device_name, info->io_base, info->irq_level);
2574 /* output current serial signal states */
2575 spin_lock_irqsave(&info->lock,flags);
2577 spin_unlock_irqrestore(&info->lock,flags);
2581 if (info->serial_signals & SerialSignal_RTS)
2582 strcat(stat_buf, "|RTS");
2583 if (info->serial_signals & SerialSignal_CTS)
2584 strcat(stat_buf, "|CTS");
2585 if (info->serial_signals & SerialSignal_DTR)
2586 strcat(stat_buf, "|DTR");
2587 if (info->serial_signals & SerialSignal_DSR)
2588 strcat(stat_buf, "|DSR");
2589 if (info->serial_signals & SerialSignal_DCD)
2590 strcat(stat_buf, "|CD");
2591 if (info->serial_signals & SerialSignal_RI)
2592 strcat(stat_buf, "|RI");
2594 if (info->params.mode == MGSL_MODE_HDLC) {
2595 seq_printf(m, " HDLC txok:%d rxok:%d",
2596 info->icount.txok, info->icount.rxok);
2597 if (info->icount.txunder)
2598 seq_printf(m, " txunder:%d", info->icount.txunder);
2599 if (info->icount.txabort)
2600 seq_printf(m, " txabort:%d", info->icount.txabort);
2601 if (info->icount.rxshort)
2602 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2603 if (info->icount.rxlong)
2604 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2605 if (info->icount.rxover)
2606 seq_printf(m, " rxover:%d", info->icount.rxover);
2607 if (info->icount.rxcrc)
2608 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2610 seq_printf(m, " ASYNC tx:%d rx:%d",
2611 info->icount.tx, info->icount.rx);
2612 if (info->icount.frame)
2613 seq_printf(m, " fe:%d", info->icount.frame);
2614 if (info->icount.parity)
2615 seq_printf(m, " pe:%d", info->icount.parity);
2616 if (info->icount.brk)
2617 seq_printf(m, " brk:%d", info->icount.brk);
2618 if (info->icount.overrun)
2619 seq_printf(m, " oe:%d", info->icount.overrun);
2622 /* Append serial signal status to end */
2623 seq_printf(m, " %s\n", stat_buf+1);
2625 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2626 info->tx_active,info->bh_requested,info->bh_running,
2630 /* Called to print information about devices
2632 static int mgslpc_proc_show(struct seq_file *m, void *v)
2636 seq_printf(m, "synclink driver:%s\n", driver_version);
2638 info = mgslpc_device_list;
2641 info = info->next_device;
2646 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2648 return single_open(file, mgslpc_proc_show, NULL);
2651 static const struct file_operations mgslpc_proc_fops = {
2652 .owner = THIS_MODULE,
2653 .open = mgslpc_proc_open,
2655 .llseek = seq_lseek,
2656 .release = single_release,
2659 static int rx_alloc_buffers(MGSLPC_INFO *info)
2661 /* each buffer has header and data */
2662 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2664 /* calculate total allocation size for 8 buffers */
2665 info->rx_buf_total_size = info->rx_buf_size * 8;
2667 /* limit total allocated memory */
2668 if (info->rx_buf_total_size > 0x10000)
2669 info->rx_buf_total_size = 0x10000;
2671 /* calculate number of buffers */
2672 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2674 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2675 if (info->rx_buf == NULL)
2678 /* unused flag buffer to satisfy receive_buf calling interface */
2679 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2680 if (!info->flag_buf) {
2681 kfree(info->rx_buf);
2682 info->rx_buf = NULL;
2686 rx_reset_buffers(info);
2690 static void rx_free_buffers(MGSLPC_INFO *info)
2692 kfree(info->rx_buf);
2693 info->rx_buf = NULL;
2694 kfree(info->flag_buf);
2695 info->flag_buf = NULL;
2698 static int claim_resources(MGSLPC_INFO *info)
2700 if (rx_alloc_buffers(info) < 0 ) {
2701 printk( "Can't allocate rx buffer %s\n", info->device_name);
2702 release_resources(info);
2708 static void release_resources(MGSLPC_INFO *info)
2710 if (debug_level >= DEBUG_LEVEL_INFO)
2711 printk("release_resources(%s)\n", info->device_name);
2712 rx_free_buffers(info);
2715 /* Add the specified device instance data structure to the
2716 * global linked list of devices and increment the device count.
2718 * Arguments: info pointer to device instance data
2720 static void mgslpc_add_device(MGSLPC_INFO *info)
2722 info->next_device = NULL;
2723 info->line = mgslpc_device_count;
2724 sprintf(info->device_name,"ttySLP%d",info->line);
2726 if (info->line < MAX_DEVICE_COUNT) {
2727 if (maxframe[info->line])
2728 info->max_frame_size = maxframe[info->line];
2731 mgslpc_device_count++;
2733 if (!mgslpc_device_list)
2734 mgslpc_device_list = info;
2736 MGSLPC_INFO *current_dev = mgslpc_device_list;
2737 while( current_dev->next_device )
2738 current_dev = current_dev->next_device;
2739 current_dev->next_device = info;
2742 if (info->max_frame_size < 4096)
2743 info->max_frame_size = 4096;
2744 else if (info->max_frame_size > 65535)
2745 info->max_frame_size = 65535;
2747 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2748 info->device_name, info->io_base, info->irq_level);
2750 #if SYNCLINK_GENERIC_HDLC
2753 tty_port_register_device(&info->port, serial_driver, info->line,
2757 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2759 MGSLPC_INFO *info = mgslpc_device_list;
2760 MGSLPC_INFO *last = NULL;
2763 if (info == remove_info) {
2765 last->next_device = info->next_device;
2767 mgslpc_device_list = info->next_device;
2768 tty_unregister_device(serial_driver, info->line);
2769 #if SYNCLINK_GENERIC_HDLC
2772 release_resources(info);
2773 tty_port_destroy(&info->port);
2775 mgslpc_device_count--;
2779 info = info->next_device;
2783 static const struct pcmcia_device_id mgslpc_ids[] = {
2784 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2787 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2789 static struct pcmcia_driver mgslpc_driver = {
2790 .owner = THIS_MODULE,
2791 .name = "synclink_cs",
2792 .probe = mgslpc_probe,
2793 .remove = mgslpc_detach,
2794 .id_table = mgslpc_ids,
2795 .suspend = mgslpc_suspend,
2796 .resume = mgslpc_resume,
2799 static const struct tty_operations mgslpc_ops = {
2800 .open = mgslpc_open,
2801 .close = mgslpc_close,
2802 .write = mgslpc_write,
2803 .put_char = mgslpc_put_char,
2804 .flush_chars = mgslpc_flush_chars,
2805 .write_room = mgslpc_write_room,
2806 .chars_in_buffer = mgslpc_chars_in_buffer,
2807 .flush_buffer = mgslpc_flush_buffer,
2808 .ioctl = mgslpc_ioctl,
2809 .throttle = mgslpc_throttle,
2810 .unthrottle = mgslpc_unthrottle,
2811 .send_xchar = mgslpc_send_xchar,
2812 .break_ctl = mgslpc_break,
2813 .wait_until_sent = mgslpc_wait_until_sent,
2814 .set_termios = mgslpc_set_termios,
2816 .start = tx_release,
2817 .hangup = mgslpc_hangup,
2818 .tiocmget = tiocmget,
2819 .tiocmset = tiocmset,
2820 .get_icount = mgslpc_get_icount,
2821 .proc_fops = &mgslpc_proc_fops,
2824 static int __init synclink_cs_init(void)
2828 if (break_on_load) {
2829 mgslpc_get_text_ptr();
2833 serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2834 TTY_DRIVER_REAL_RAW |
2835 TTY_DRIVER_DYNAMIC_DEV);
2836 if (IS_ERR(serial_driver)) {
2837 rc = PTR_ERR(serial_driver);
2841 /* Initialize the tty_driver structure */
2842 serial_driver->driver_name = "synclink_cs";
2843 serial_driver->name = "ttySLP";
2844 serial_driver->major = ttymajor;
2845 serial_driver->minor_start = 64;
2846 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2847 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2848 serial_driver->init_termios = tty_std_termios;
2849 serial_driver->init_termios.c_cflag =
2850 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2851 tty_set_operations(serial_driver, &mgslpc_ops);
2853 rc = tty_register_driver(serial_driver);
2855 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2856 __FILE__, __LINE__);
2860 rc = pcmcia_register_driver(&mgslpc_driver);
2864 printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2865 serial_driver->major);
2869 tty_unregister_driver(serial_driver);
2871 put_tty_driver(serial_driver);
2876 static void __exit synclink_cs_exit(void)
2878 pcmcia_unregister_driver(&mgslpc_driver);
2879 tty_unregister_driver(serial_driver);
2880 put_tty_driver(serial_driver);
2883 module_init(synclink_cs_init);
2884 module_exit(synclink_cs_exit);
2886 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2891 /* note:standard BRG mode is broken in V3.2 chip
2892 * so enhanced mode is always used
2900 for (M = 1; N > 64 && M < 16; M++)
2906 * BGR[7..0] contained in BGR register
2907 * BGR[9..8] contained in CCR2[7..6]
2908 * divisor = (N+1)*2^M
2910 * Note: M *must* not be zero (causes asymetric duty cycle)
2912 write_reg(info, (unsigned char) (channel + BGR),
2913 (unsigned char) ((M << 6) + N));
2914 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2915 val |= ((M << 4) & 0xc0);
2916 write_reg(info, (unsigned char) (channel + CCR2), val);
2920 /* Enabled the AUX clock output at the specified frequency.
2922 static void enable_auxclk(MGSLPC_INFO *info)
2928 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2929 * 05 ADM Address Mode, 0 = no addr recognition
2930 * 04 TMD Timer Mode, 0 = external
2931 * 03 RAC Receiver Active, 0 = inactive
2932 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2933 * 01 TRS Timer Resolution, 1=512
2934 * 00 TLP Test Loop, 0 = no loop
2940 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2941 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2943 write_reg(info, CHB + MODE, val);
2947 * 07 PU Power Up, 1=active, 0=power down
2948 * 06 MCE Master Clock Enable, 1=enabled
2950 * 04..02 SC[2..0] Encoding
2951 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2955 write_reg(info, CHB + CCR0, 0xc0);
2959 * 07 SFLG Shared Flag, 0 = disable shared flags
2960 * 06 GALP Go Active On Loop, 0 = not used
2961 * 05 GLP Go On Loop, 0 = not used
2962 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2963 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2964 * 02..00 CM[2..0] Clock Mode
2968 write_reg(info, CHB + CCR1, 0x17);
2972 * 07..06 BGR[9..8] Baud rate bits 9..8
2973 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2974 * 04 SSEL Clock source select, 1=submode b
2975 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2976 * 02 RWX Read/Write Exchange 0=disabled
2977 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2978 * 00 DIV, data inversion 0=disabled, 1=enabled
2982 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2983 write_reg(info, CHB + CCR2, 0x38);
2985 write_reg(info, CHB + CCR2, 0x30);
2989 * 07 MCK4 Master Clock Divide by 4, 1=enabled
2990 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2991 * 05 TST1 Test Pin, 0=normal operation
2992 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
2993 * 03..02 Reserved, must be 0
2994 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
2998 write_reg(info, CHB + CCR4, 0x50);
3000 /* if auxclk not enabled, set internal BRG so
3001 * CTS transitions can be detected (requires TxC)
3003 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3004 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3006 mgslpc_set_rate(info, CHB, 921600);
3009 static void loopback_enable(MGSLPC_INFO *info)
3013 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3014 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3015 write_reg(info, CHA + CCR1, val);
3017 /* CCR2:04 SSEL Clock source select, 1=submode b */
3018 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3019 write_reg(info, CHA + CCR2, val);
3021 /* set LinkSpeed if available, otherwise default to 2Mbps */
3022 if (info->params.clock_speed)
3023 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3025 mgslpc_set_rate(info, CHA, 1843200);
3027 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3028 val = read_reg(info, CHA + MODE) | BIT0;
3029 write_reg(info, CHA + MODE, val);
3032 static void hdlc_mode(MGSLPC_INFO *info)
3035 unsigned char clkmode, clksubmode;
3037 /* disable all interrupts */
3038 irq_disable(info, CHA, 0xffff);
3039 irq_disable(info, CHB, 0xffff);
3040 port_irq_disable(info, 0xff);
3042 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3043 clkmode = clksubmode = 0;
3044 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3045 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3046 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3048 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3049 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3050 /* clock mode 7b, rcv = BRG, xmt = BRG */
3053 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3054 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3055 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3059 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3062 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3063 /* clock mode 0b, rcv = RxC, xmt = BRG */
3069 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3070 * 05 ADM Address Mode, 0 = no addr recognition
3071 * 04 TMD Timer Mode, 0 = external
3072 * 03 RAC Receiver Active, 0 = inactive
3073 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3074 * 01 TRS Timer Resolution, 1=512
3075 * 00 TLP Test Loop, 0 = no loop
3080 if (info->params.loopback)
3083 /* preserve RTS state */
3084 if (info->serial_signals & SerialSignal_RTS)
3086 write_reg(info, CHA + MODE, val);
3090 * 07 PU Power Up, 1=active, 0=power down
3091 * 06 MCE Master Clock Enable, 1=enabled
3093 * 04..02 SC[2..0] Encoding
3094 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3099 switch (info->params.encoding)
3101 case HDLC_ENCODING_NRZI:
3104 case HDLC_ENCODING_BIPHASE_SPACE:
3107 case HDLC_ENCODING_BIPHASE_MARK:
3110 case HDLC_ENCODING_BIPHASE_LEVEL:
3112 break; // Manchester
3114 write_reg(info, CHA + CCR0, val);
3118 * 07 SFLG Shared Flag, 0 = disable shared flags
3119 * 06 GALP Go Active On Loop, 0 = not used
3120 * 05 GLP Go On Loop, 0 = not used
3121 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3122 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3123 * 02..00 CM[2..0] Clock Mode
3127 val = 0x10 + clkmode;
3128 write_reg(info, CHA + CCR1, val);
3132 * 07..06 BGR[9..8] Baud rate bits 9..8
3133 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3134 * 04 SSEL Clock source select, 1=submode b
3135 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3136 * 02 RWX Read/Write Exchange 0=disabled
3137 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3138 * 00 DIV, data inversion 0=disabled, 1=enabled
3143 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3144 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3148 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3150 if (info->params.encoding == HDLC_ENCODING_NRZB)
3152 write_reg(info, CHA + CCR2, val);
3156 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3157 * 05 EPT Enable preamble transmission, 1=enabled
3158 * 04 RADD Receive address pushed to FIFO, 0=disabled
3159 * 03 CRL CRC Reset Level, 0=FFFF
3160 * 02 RCRC Rx CRC 0=On 1=Off
3161 * 01 TCRC Tx CRC 0=On 1=Off
3162 * 00 PSD DPLL Phase Shift Disable
3167 if (info->params.crc_type == HDLC_CRC_NONE)
3169 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3171 switch (info->params.preamble_length)
3173 case HDLC_PREAMBLE_LENGTH_16BITS:
3176 case HDLC_PREAMBLE_LENGTH_32BITS:
3179 case HDLC_PREAMBLE_LENGTH_64BITS:
3183 write_reg(info, CHA + CCR3, val);
3185 /* PRE - Preamble pattern */
3187 switch (info->params.preamble)
3189 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3190 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3191 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3192 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3194 write_reg(info, CHA + PRE, val);
3198 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3199 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3200 * 05 TST1 Test Pin, 0=normal operation
3201 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3202 * 03..02 Reserved, must be 0
3203 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3208 write_reg(info, CHA + CCR4, val);
3209 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3210 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3212 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3214 /* RLCR Receive length check register
3216 * 7 1=enable receive length check
3217 * 6..0 Max frame length = (RL + 1) * 32
3219 write_reg(info, CHA + RLCR, 0);
3221 /* XBCH Transmit Byte Count High
3223 * 07 DMA mode, 0 = interrupt driven
3224 * 06 NRM, 0=ABM (ignored)
3225 * 05 CAS Carrier Auto Start
3226 * 04 XC Transmit Continuously (ignored)
3227 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3232 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3234 write_reg(info, CHA + XBCH, val);
3235 enable_auxclk(info);
3236 if (info->params.loopback || info->testing_irq)
3237 loopback_enable(info);
3238 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3240 irq_enable(info, CHB, IRQ_CTS);
3241 /* PVR[3] 1=AUTO CTS active */
3242 set_reg_bits(info, CHA + PVR, BIT3);
3244 clear_reg_bits(info, CHA + PVR, BIT3);
3246 irq_enable(info, CHA,
3247 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3248 IRQ_UNDERRUN + IRQ_TXFIFO);
3249 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3250 wait_command_complete(info, CHA);
3251 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3253 /* Master clock mode enabled above to allow reset commands
3254 * to complete even if no data clocks are present.
3256 * Disable master clock mode for normal communications because
3257 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3258 * IRQ when in master clock mode.
3260 * Leave master clock mode enabled for IRQ test because the
3261 * timer IRQ used by the test can only happen in master clock mode.
3263 if (!info->testing_irq)
3264 clear_reg_bits(info, CHA + CCR0, BIT6);
3272 static void rx_stop(MGSLPC_INFO *info)
3274 if (debug_level >= DEBUG_LEVEL_ISR)
3275 printk("%s(%d):rx_stop(%s)\n",
3276 __FILE__,__LINE__, info->device_name );
3278 /* MODE:03 RAC Receiver Active, 0=inactive */
3279 clear_reg_bits(info, CHA + MODE, BIT3);
3281 info->rx_enabled = false;
3282 info->rx_overflow = false;
3285 static void rx_start(MGSLPC_INFO *info)
3287 if (debug_level >= DEBUG_LEVEL_ISR)
3288 printk("%s(%d):rx_start(%s)\n",
3289 __FILE__,__LINE__, info->device_name );
3291 rx_reset_buffers(info);
3292 info->rx_enabled = false;
3293 info->rx_overflow = false;
3295 /* MODE:03 RAC Receiver Active, 1=active */
3296 set_reg_bits(info, CHA + MODE, BIT3);
3298 info->rx_enabled = true;
3301 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3303 if (debug_level >= DEBUG_LEVEL_ISR)
3304 printk("%s(%d):tx_start(%s)\n",
3305 __FILE__,__LINE__, info->device_name );
3307 if (info->tx_count) {
3308 /* If auto RTS enabled and RTS is inactive, then assert */
3309 /* RTS and set a flag indicating that the driver should */
3310 /* negate RTS when the transmission completes. */
3311 info->drop_rts_on_tx_done = false;
3313 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3315 if (!(info->serial_signals & SerialSignal_RTS)) {
3316 info->serial_signals |= SerialSignal_RTS;
3318 info->drop_rts_on_tx_done = true;
3322 if (info->params.mode == MGSL_MODE_ASYNC) {
3323 if (!info->tx_active) {
3324 info->tx_active = true;
3325 tx_ready(info, tty);
3328 info->tx_active = true;
3329 tx_ready(info, tty);
3330 mod_timer(&info->tx_timer, jiffies +
3331 msecs_to_jiffies(5000));
3335 if (!info->tx_enabled)
3336 info->tx_enabled = true;
3339 static void tx_stop(MGSLPC_INFO *info)
3341 if (debug_level >= DEBUG_LEVEL_ISR)
3342 printk("%s(%d):tx_stop(%s)\n",
3343 __FILE__,__LINE__, info->device_name );
3345 del_timer(&info->tx_timer);
3347 info->tx_enabled = false;
3348 info->tx_active = false;
3351 /* Reset the adapter to a known state and prepare it for further use.
3353 static void reset_device(MGSLPC_INFO *info)
3355 /* power up both channels (set BIT7) */
3356 write_reg(info, CHA + CCR0, 0x80);
3357 write_reg(info, CHB + CCR0, 0x80);
3358 write_reg(info, CHA + MODE, 0);
3359 write_reg(info, CHB + MODE, 0);
3361 /* disable all interrupts */
3362 irq_disable(info, CHA, 0xffff);
3363 irq_disable(info, CHB, 0xffff);
3364 port_irq_disable(info, 0xff);
3366 /* PCR Port Configuration Register
3368 * 07..04 DEC[3..0] Serial I/F select outputs
3369 * 03 output, 1=AUTO CTS control enabled
3370 * 02 RI Ring Indicator input 0=active
3371 * 01 DSR input 0=active
3372 * 00 DTR output 0=active
3376 write_reg(info, PCR, 0x06);
3378 /* PVR Port Value Register
3380 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3381 * 03 AUTO CTS output 1=enabled
3382 * 02 RI Ring Indicator input
3384 * 00 DTR output (1=inactive)
3388 // write_reg(info, PVR, PVR_DTR);
3390 /* IPC Interrupt Port Configuration
3392 * 07 VIS 1=Masked interrupts visible
3393 * 06..05 Reserved, 0
3394 * 04..03 SLA Slave address, 00 ignored
3395 * 02 CASM Cascading Mode, 1=daisy chain
3396 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3400 write_reg(info, IPC, 0x05);
3403 static void async_mode(MGSLPC_INFO *info)
3407 /* disable all interrupts */
3408 irq_disable(info, CHA, 0xffff);
3409 irq_disable(info, CHB, 0xffff);
3410 port_irq_disable(info, 0xff);
3415 * 06 FRTS RTS State, 0=active
3416 * 05 FCTS Flow Control on CTS
3417 * 04 FLON Flow Control Enable
3418 * 03 RAC Receiver Active, 0 = inactive
3419 * 02 RTS 0=Auto RTS, 1=manual RTS
3420 * 01 TRS Timer Resolution, 1=512
3421 * 00 TLP Test Loop, 0 = no loop
3426 if (info->params.loopback)
3429 /* preserve RTS state */
3430 if (!(info->serial_signals & SerialSignal_RTS))
3432 write_reg(info, CHA + MODE, val);
3436 * 07 PU Power Up, 1=active, 0=power down
3437 * 06 MCE Master Clock Enable, 1=enabled
3439 * 04..02 SC[2..0] Encoding, 000=NRZ
3440 * 01..00 SM[1..0] Serial Mode, 11=Async
3444 write_reg(info, CHA + CCR0, 0x83);
3448 * 07..05 Reserved, 0
3449 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3450 * 03 BCR Bit Clock Rate, 1=16x
3451 * 02..00 CM[2..0] Clock Mode, 111=BRG
3455 write_reg(info, CHA + CCR1, 0x1f);
3459 * 07..06 BGR[9..8] Baud rate bits 9..8
3460 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3461 * 04 SSEL Clock source select, 1=submode b
3462 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3463 * 02 RWX Read/Write Exchange 0=disabled
3465 * 00 DIV, data inversion 0=disabled, 1=enabled
3469 write_reg(info, CHA + CCR2, 0x10);
3473 * 07..01 Reserved, 0
3474 * 00 PSD DPLL Phase Shift Disable
3478 write_reg(info, CHA + CCR3, 0);
3482 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3483 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3484 * 05 TST1 Test Pin, 0=normal operation
3485 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3486 * 03..00 Reserved, must be 0
3490 write_reg(info, CHA + CCR4, 0x50);
3491 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3496 * 06 XBRK transmit break, 0=normal operation
3497 * 05 Stop bits (0=1, 1=2)
3498 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3499 * 02 PAREN Parity Enable
3500 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3504 if (info->params.data_bits != 8)
3505 val |= BIT0; /* 7 bits */
3506 if (info->params.stop_bits != 1)
3508 if (info->params.parity != ASYNC_PARITY_NONE)
3510 val |= BIT2; /* Parity enable */
3511 if (info->params.parity == ASYNC_PARITY_ODD)
3516 write_reg(info, CHA + DAFO, val);
3518 /* RFC Rx FIFO Control
3521 * 06 DPS, 1=parity bit not stored in data byte
3522 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3523 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3524 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3526 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3530 write_reg(info, CHA + RFC, 0x5c);
3532 /* RLCR Receive length check register
3534 * Max frame length = (RL + 1) * 32
3536 write_reg(info, CHA + RLCR, 0);
3538 /* XBCH Transmit Byte Count High
3540 * 07 DMA mode, 0 = interrupt driven
3541 * 06 NRM, 0=ABM (ignored)
3542 * 05 CAS Carrier Auto Start
3543 * 04 XC Transmit Continuously (ignored)
3544 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3549 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3551 write_reg(info, CHA + XBCH, val);
3552 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3553 irq_enable(info, CHA, IRQ_CTS);
3555 /* MODE:03 RAC Receiver Active, 1=active */
3556 set_reg_bits(info, CHA + MODE, BIT3);
3557 enable_auxclk(info);
3558 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3559 irq_enable(info, CHB, IRQ_CTS);
3560 /* PVR[3] 1=AUTO CTS active */
3561 set_reg_bits(info, CHA + PVR, BIT3);
3563 clear_reg_bits(info, CHA + PVR, BIT3);
3564 irq_enable(info, CHA,
3565 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3566 IRQ_ALLSENT + IRQ_TXFIFO);
3567 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3568 wait_command_complete(info, CHA);
3569 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3572 /* Set the HDLC idle mode for the transmitter.
3574 static void tx_set_idle(MGSLPC_INFO *info)
3576 /* Note: ESCC2 only supports flags and one idle modes */
3577 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3578 set_reg_bits(info, CHA + CCR1, BIT3);
3580 clear_reg_bits(info, CHA + CCR1, BIT3);
3583 /* get state of the V24 status (input) signals.
3585 static void get_signals(MGSLPC_INFO *info)
3587 unsigned char status = 0;
3589 /* preserve DTR and RTS */
3590 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3592 if (read_reg(info, CHB + VSTR) & BIT7)
3593 info->serial_signals |= SerialSignal_DCD;
3594 if (read_reg(info, CHB + STAR) & BIT1)
3595 info->serial_signals |= SerialSignal_CTS;
3597 status = read_reg(info, CHA + PVR);
3598 if (!(status & PVR_RI))
3599 info->serial_signals |= SerialSignal_RI;
3600 if (!(status & PVR_DSR))
3601 info->serial_signals |= SerialSignal_DSR;
3604 /* Set the state of DTR and RTS based on contents of
3605 * serial_signals member of device extension.
3607 static void set_signals(MGSLPC_INFO *info)
3611 val = read_reg(info, CHA + MODE);
3612 if (info->params.mode == MGSL_MODE_ASYNC) {
3613 if (info->serial_signals & SerialSignal_RTS)
3618 if (info->serial_signals & SerialSignal_RTS)
3623 write_reg(info, CHA + MODE, val);
3625 if (info->serial_signals & SerialSignal_DTR)
3626 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3628 set_reg_bits(info, CHA + PVR, PVR_DTR);
3631 static void rx_reset_buffers(MGSLPC_INFO *info)
3638 info->rx_frame_count = 0;
3639 for (i=0 ; i < info->rx_buf_count ; i++) {
3640 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3641 buf->status = buf->count = 0;
3645 /* Attempt to return a received HDLC frame
3646 * Only frames received without errors are returned.
3648 * Returns true if frame returned, otherwise false
3650 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3652 unsigned short status;
3654 unsigned int framesize = 0;
3655 unsigned long flags;
3656 bool return_frame = false;
3658 if (info->rx_frame_count == 0)
3661 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3663 status = buf->status;
3665 /* 07 VFR 1=valid frame
3666 * 06 RDO 1=data overrun
3667 * 05 CRC 1=OK, 0=error
3668 * 04 RAB 1=frame aborted
3670 if ((status & 0xf0) != 0xA0) {
3671 if (!(status & BIT7) || (status & BIT4))
3672 info->icount.rxabort++;
3673 else if (status & BIT6)
3674 info->icount.rxover++;
3675 else if (!(status & BIT5)) {
3676 info->icount.rxcrc++;
3677 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3678 return_frame = true;
3681 #if SYNCLINK_GENERIC_HDLC
3683 info->netdev->stats.rx_errors++;
3684 info->netdev->stats.rx_frame_errors++;
3688 return_frame = true;
3691 framesize = buf->count;
3693 if (debug_level >= DEBUG_LEVEL_BH)
3694 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3695 __FILE__,__LINE__,info->device_name,status,framesize);
3697 if (debug_level >= DEBUG_LEVEL_DATA)
3698 trace_block(info, buf->data, framesize, 0);
3701 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3702 framesize+1 > info->max_frame_size) ||
3703 framesize > info->max_frame_size)
3704 info->icount.rxlong++;
3707 info->icount.rxok++;
3709 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3710 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3714 #if SYNCLINK_GENERIC_HDLC
3716 hdlcdev_rx(info, buf->data, framesize);
3719 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3723 spin_lock_irqsave(&info->lock,flags);
3724 buf->status = buf->count = 0;
3725 info->rx_frame_count--;
3727 if (info->rx_get >= info->rx_buf_count)
3729 spin_unlock_irqrestore(&info->lock,flags);
3734 static bool register_test(MGSLPC_INFO *info)
3736 static unsigned char patterns[] =
3737 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3738 static unsigned int count = ARRAY_SIZE(patterns);
3741 unsigned long flags;
3743 spin_lock_irqsave(&info->lock,flags);
3746 for (i = 0; i < count; i++) {
3747 write_reg(info, XAD1, patterns[i]);
3748 write_reg(info, XAD2, patterns[(i + 1) % count]);
3749 if ((read_reg(info, XAD1) != patterns[i]) ||
3750 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3756 spin_unlock_irqrestore(&info->lock,flags);
3760 static bool irq_test(MGSLPC_INFO *info)
3762 unsigned long end_time;
3763 unsigned long flags;
3765 spin_lock_irqsave(&info->lock,flags);
3768 info->testing_irq = true;
3771 info->irq_occurred = false;
3773 /* init hdlc mode */
3775 irq_enable(info, CHA, IRQ_TIMER);
3776 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3777 issue_command(info, CHA, CMD_START_TIMER);
3779 spin_unlock_irqrestore(&info->lock,flags);
3782 while(end_time-- && !info->irq_occurred) {
3783 msleep_interruptible(10);
3786 info->testing_irq = false;
3788 spin_lock_irqsave(&info->lock,flags);
3790 spin_unlock_irqrestore(&info->lock,flags);
3792 return info->irq_occurred;
3795 static int adapter_test(MGSLPC_INFO *info)
3797 if (!register_test(info)) {
3798 info->init_error = DiagStatus_AddressFailure;
3799 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3800 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3804 if (!irq_test(info)) {
3805 info->init_error = DiagStatus_IrqFailure;
3806 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3807 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3811 if (debug_level >= DEBUG_LEVEL_INFO)
3812 printk("%s(%d):device %s passed diagnostics\n",
3813 __FILE__,__LINE__,info->device_name);
3817 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3822 printk("%s tx data:\n",info->device_name);
3824 printk("%s rx data:\n",info->device_name);
3832 for(i=0;i<linecount;i++)
3833 printk("%02X ",(unsigned char)data[i]);
3836 for(i=0;i<linecount;i++) {
3837 if (data[i]>=040 && data[i]<=0176)
3838 printk("%c",data[i]);
3849 /* HDLC frame time out
3850 * update stats and do tx completion processing
3852 static void tx_timeout(unsigned long context)
3854 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3855 unsigned long flags;
3857 if ( debug_level >= DEBUG_LEVEL_INFO )
3858 printk( "%s(%d):tx_timeout(%s)\n",
3859 __FILE__,__LINE__,info->device_name);
3860 if(info->tx_active &&
3861 info->params.mode == MGSL_MODE_HDLC) {
3862 info->icount.txtimeout++;
3864 spin_lock_irqsave(&info->lock,flags);
3865 info->tx_active = false;
3866 info->tx_count = info->tx_put = info->tx_get = 0;
3868 spin_unlock_irqrestore(&info->lock,flags);
3870 #if SYNCLINK_GENERIC_HDLC
3872 hdlcdev_tx_done(info);
3876 struct tty_struct *tty = tty_port_tty_get(&info->port);
3877 bh_transmit(info, tty);
3882 #if SYNCLINK_GENERIC_HDLC
3885 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3886 * set encoding and frame check sequence (FCS) options
3888 * dev pointer to network device structure
3889 * encoding serial encoding setting
3890 * parity FCS setting
3892 * returns 0 if success, otherwise error code
3894 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3895 unsigned short parity)
3897 MGSLPC_INFO *info = dev_to_port(dev);
3898 struct tty_struct *tty;
3899 unsigned char new_encoding;
3900 unsigned short new_crctype;
3902 /* return error if TTY interface open */
3903 if (info->port.count)
3908 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3909 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3910 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3911 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3912 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3913 default: return -EINVAL;
3918 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3919 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3920 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3921 default: return -EINVAL;
3924 info->params.encoding = new_encoding;
3925 info->params.crc_type = new_crctype;
3927 /* if network interface up, reprogram hardware */
3928 if (info->netcount) {
3929 tty = tty_port_tty_get(&info->port);
3930 mgslpc_program_hw(info, tty);
3938 * called by generic HDLC layer to send frame
3940 * skb socket buffer containing HDLC frame
3941 * dev pointer to network device structure
3943 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3944 struct net_device *dev)
3946 MGSLPC_INFO *info = dev_to_port(dev);
3947 unsigned long flags;
3949 if (debug_level >= DEBUG_LEVEL_INFO)
3950 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3952 /* stop sending until this frame completes */
3953 netif_stop_queue(dev);
3955 /* copy data to device buffers */
3956 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3958 info->tx_put = info->tx_count = skb->len;
3960 /* update network statistics */
3961 dev->stats.tx_packets++;
3962 dev->stats.tx_bytes += skb->len;
3964 /* done with socket buffer, so free it */
3967 /* save start time for transmit timeout detection */
3968 dev->trans_start = jiffies;
3970 /* start hardware transmitter if necessary */
3971 spin_lock_irqsave(&info->lock,flags);
3972 if (!info->tx_active) {
3973 struct tty_struct *tty = tty_port_tty_get(&info->port);
3974 tx_start(info, tty);
3977 spin_unlock_irqrestore(&info->lock,flags);
3979 return NETDEV_TX_OK;
3983 * called by network layer when interface enabled
3984 * claim resources and initialize hardware
3986 * dev pointer to network device structure
3988 * returns 0 if success, otherwise error code
3990 static int hdlcdev_open(struct net_device *dev)
3992 MGSLPC_INFO *info = dev_to_port(dev);
3993 struct tty_struct *tty;
3995 unsigned long flags;
3997 if (debug_level >= DEBUG_LEVEL_INFO)
3998 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4000 /* generic HDLC layer open processing */
4001 if ((rc = hdlc_open(dev)))
4004 /* arbitrate between network and tty opens */
4005 spin_lock_irqsave(&info->netlock, flags);
4006 if (info->port.count != 0 || info->netcount != 0) {
4007 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4008 spin_unlock_irqrestore(&info->netlock, flags);
4012 spin_unlock_irqrestore(&info->netlock, flags);
4014 tty = tty_port_tty_get(&info->port);
4015 /* claim resources and init adapter */
4016 if ((rc = startup(info, tty)) != 0) {
4018 spin_lock_irqsave(&info->netlock, flags);
4020 spin_unlock_irqrestore(&info->netlock, flags);
4023 /* assert DTR and RTS, apply hardware settings */
4024 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4025 mgslpc_program_hw(info, tty);
4028 /* enable network layer transmit */
4029 dev->trans_start = jiffies;
4030 netif_start_queue(dev);
4032 /* inform generic HDLC layer of current DCD status */
4033 spin_lock_irqsave(&info->lock, flags);
4035 spin_unlock_irqrestore(&info->lock, flags);
4036 if (info->serial_signals & SerialSignal_DCD)
4037 netif_carrier_on(dev);
4039 netif_carrier_off(dev);
4044 * called by network layer when interface is disabled
4045 * shutdown hardware and release resources
4047 * dev pointer to network device structure
4049 * returns 0 if success, otherwise error code
4051 static int hdlcdev_close(struct net_device *dev)
4053 MGSLPC_INFO *info = dev_to_port(dev);
4054 struct tty_struct *tty = tty_port_tty_get(&info->port);
4055 unsigned long flags;
4057 if (debug_level >= DEBUG_LEVEL_INFO)
4058 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4060 netif_stop_queue(dev);
4062 /* shutdown adapter and release resources */
4063 shutdown(info, tty);
4067 spin_lock_irqsave(&info->netlock, flags);
4069 spin_unlock_irqrestore(&info->netlock, flags);
4075 * called by network layer to process IOCTL call to network device
4077 * dev pointer to network device structure
4078 * ifr pointer to network interface request structure
4079 * cmd IOCTL command code
4081 * returns 0 if success, otherwise error code
4083 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4085 const size_t size = sizeof(sync_serial_settings);
4086 sync_serial_settings new_line;
4087 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4088 MGSLPC_INFO *info = dev_to_port(dev);
4091 if (debug_level >= DEBUG_LEVEL_INFO)
4092 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4094 /* return error if TTY interface open */
4095 if (info->port.count)
4098 if (cmd != SIOCWANDEV)
4099 return hdlc_ioctl(dev, ifr, cmd);
4101 memset(&new_line, 0, size);
4103 switch(ifr->ifr_settings.type) {
4104 case IF_GET_IFACE: /* return current sync_serial_settings */
4106 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4107 if (ifr->ifr_settings.size < size) {
4108 ifr->ifr_settings.size = size; /* data size wanted */
4112 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4113 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4114 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4115 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4118 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4119 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4120 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4121 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4122 default: new_line.clock_type = CLOCK_DEFAULT;
4125 new_line.clock_rate = info->params.clock_speed;
4126 new_line.loopback = info->params.loopback ? 1:0;
4128 if (copy_to_user(line, &new_line, size))
4132 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4134 if(!capable(CAP_NET_ADMIN))
4136 if (copy_from_user(&new_line, line, size))
4139 switch (new_line.clock_type)
4141 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4142 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4143 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4144 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4145 case CLOCK_DEFAULT: flags = info->params.flags &
4146 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4147 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4148 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4149 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4150 default: return -EINVAL;
4153 if (new_line.loopback != 0 && new_line.loopback != 1)
4156 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4157 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4158 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4159 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4160 info->params.flags |= flags;
4162 info->params.loopback = new_line.loopback;
4164 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4165 info->params.clock_speed = new_line.clock_rate;
4167 info->params.clock_speed = 0;
4169 /* if network interface up, reprogram hardware */
4170 if (info->netcount) {
4171 struct tty_struct *tty = tty_port_tty_get(&info->port);
4172 mgslpc_program_hw(info, tty);
4178 return hdlc_ioctl(dev, ifr, cmd);
4183 * called by network layer when transmit timeout is detected
4185 * dev pointer to network device structure
4187 static void hdlcdev_tx_timeout(struct net_device *dev)
4189 MGSLPC_INFO *info = dev_to_port(dev);
4190 unsigned long flags;
4192 if (debug_level >= DEBUG_LEVEL_INFO)
4193 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4195 dev->stats.tx_errors++;
4196 dev->stats.tx_aborted_errors++;
4198 spin_lock_irqsave(&info->lock,flags);
4200 spin_unlock_irqrestore(&info->lock,flags);
4202 netif_wake_queue(dev);
4206 * called by device driver when transmit completes
4207 * reenable network layer transmit if stopped
4209 * info pointer to device instance information
4211 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4213 if (netif_queue_stopped(info->netdev))
4214 netif_wake_queue(info->netdev);
4218 * called by device driver when frame received
4219 * pass frame to network layer
4221 * info pointer to device instance information
4222 * buf pointer to buffer contianing frame data
4223 * size count of data bytes in buf
4225 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4227 struct sk_buff *skb = dev_alloc_skb(size);
4228 struct net_device *dev = info->netdev;
4230 if (debug_level >= DEBUG_LEVEL_INFO)
4231 printk("hdlcdev_rx(%s)\n",dev->name);
4234 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4235 dev->stats.rx_dropped++;
4239 memcpy(skb_put(skb, size), buf, size);
4241 skb->protocol = hdlc_type_trans(skb, dev);
4243 dev->stats.rx_packets++;
4244 dev->stats.rx_bytes += size;
4249 static const struct net_device_ops hdlcdev_ops = {
4250 .ndo_open = hdlcdev_open,
4251 .ndo_stop = hdlcdev_close,
4252 .ndo_change_mtu = hdlc_change_mtu,
4253 .ndo_start_xmit = hdlc_start_xmit,
4254 .ndo_do_ioctl = hdlcdev_ioctl,
4255 .ndo_tx_timeout = hdlcdev_tx_timeout,
4259 * called by device driver when adding device instance
4260 * do generic HDLC initialization
4262 * info pointer to device instance information
4264 * returns 0 if success, otherwise error code
4266 static int hdlcdev_init(MGSLPC_INFO *info)
4269 struct net_device *dev;
4272 /* allocate and initialize network and HDLC layer objects */
4274 if (!(dev = alloc_hdlcdev(info))) {
4275 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4279 /* for network layer reporting purposes only */
4280 dev->base_addr = info->io_base;
4281 dev->irq = info->irq_level;
4283 /* network layer callbacks and settings */
4284 dev->netdev_ops = &hdlcdev_ops;
4285 dev->watchdog_timeo = 10 * HZ;
4286 dev->tx_queue_len = 50;
4288 /* generic HDLC layer callbacks and settings */
4289 hdlc = dev_to_hdlc(dev);
4290 hdlc->attach = hdlcdev_attach;
4291 hdlc->xmit = hdlcdev_xmit;
4293 /* register objects with HDLC layer */
4294 if ((rc = register_hdlc_device(dev))) {
4295 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4305 * called by device driver when removing device instance
4306 * do generic HDLC cleanup
4308 * info pointer to device instance information
4310 static void hdlcdev_exit(MGSLPC_INFO *info)
4312 unregister_hdlc_device(info->netdev);
4313 free_netdev(info->netdev);
4314 info->netdev = NULL;
4317 #endif /* CONFIG_HDLC */