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>
63 #include <asm/system.h>
67 #include <linux/bitops.h>
68 #include <asm/types.h>
69 #include <linux/termios.h>
70 #include <linux/workqueue.h>
71 #include <linux/hdlc.h>
73 #include <pcmcia/cistpl.h>
74 #include <pcmcia/cisreg.h>
75 #include <pcmcia/ds.h>
77 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
78 #define SYNCLINK_GENERIC_HDLC 1
80 #define SYNCLINK_GENERIC_HDLC 0
83 #define GET_USER(error,value,addr) error = get_user(value,addr)
84 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
85 #define PUT_USER(error,value,addr) error = put_user(value,addr)
86 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
88 #include <asm/uaccess.h>
90 static MGSL_PARAMS default_params = {
91 MGSL_MODE_HDLC, /* unsigned long mode */
92 0, /* unsigned char loopback; */
93 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
94 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
95 0, /* unsigned long clock_speed; */
96 0xff, /* unsigned char addr_filter; */
97 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
98 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
99 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
100 9600, /* unsigned long data_rate; */
101 8, /* unsigned char data_bits; */
102 1, /* unsigned char stop_bits; */
103 ASYNC_PARITY_NONE /* unsigned char parity; */
109 unsigned char status;
113 /* The queue of BH actions to be performed */
116 #define BH_TRANSMIT 2
119 #define IO_PIN_SHUTDOWN_LIMIT 100
121 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
123 struct _input_signal_events {
136 * Device instance data structure
139 typedef struct _mgslpc_info {
140 struct tty_port port;
141 void *if_ptr; /* General purpose pointer (used by SPPP) */
145 struct mgsl_icount icount;
148 int x_char; /* xon/xoff character */
149 unsigned char read_status_mask;
150 unsigned char ignore_status_mask;
152 unsigned char *tx_buf;
157 /* circular list of fixed length rx buffers */
159 unsigned char *rx_buf; /* memory allocated for all rx buffers */
160 int rx_buf_total_size; /* size of memory allocated for rx buffers */
161 int rx_put; /* index of next empty rx buffer */
162 int rx_get; /* index of next full rx buffer */
163 int rx_buf_size; /* size in bytes of single rx buffer */
164 int rx_buf_count; /* total number of rx buffers */
165 int rx_frame_count; /* number of full rx buffers */
167 wait_queue_head_t status_event_wait_q;
168 wait_queue_head_t event_wait_q;
169 struct timer_list tx_timer; /* HDLC transmit timeout timer */
170 struct _mgslpc_info *next_device; /* device list link */
172 unsigned short imra_value;
173 unsigned short imrb_value;
174 unsigned char pim_value;
177 struct work_struct task; /* task structure for scheduling bh */
186 int dcd_chkcount; /* check counts to prevent */
187 int cts_chkcount; /* too many IRQs if a signal */
188 int dsr_chkcount; /* is floating */
199 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
201 char device_name[25]; /* device instance name */
203 unsigned int io_base; /* base I/O address of adapter */
204 unsigned int irq_level;
206 MGSL_PARAMS params; /* communications parameters */
208 unsigned char serial_signals; /* current serial signal states */
210 bool irq_occurred; /* for diagnostics use */
212 unsigned int init_error; /* startup error (DIAGS) */
214 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
215 bool drop_rts_on_tx_done;
217 struct _input_signal_events input_signal_events;
220 struct pcmcia_device *p_dev;
223 /* SPPP/Cisco HDLC device parts */
227 #if SYNCLINK_GENERIC_HDLC
228 struct net_device *netdev;
233 #define MGSLPC_MAGIC 0x5402
236 * The size of the serial xmit buffer is 1 page, or 4096 bytes
238 #define TXBUFSIZE 4096
241 #define CHA 0x00 /* channel A offset */
242 #define CHB 0x40 /* channel B offset */
245 * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
292 #define IRQ_BREAK_ON BIT15 // rx break detected
293 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
294 #define IRQ_ALLSENT BIT13 // all sent
295 #define IRQ_UNDERRUN BIT12 // transmit data underrun
296 #define IRQ_TIMER BIT11 // timer interrupt
297 #define IRQ_CTS BIT10 // CTS status change
298 #define IRQ_TXREPEAT BIT9 // tx message repeat
299 #define IRQ_TXFIFO BIT8 // transmit pool ready
300 #define IRQ_RXEOM BIT7 // receive message end
301 #define IRQ_EXITHUNT BIT6 // receive frame start
302 #define IRQ_RXTIME BIT6 // rx char timeout
303 #define IRQ_DCD BIT2 // carrier detect status change
304 #define IRQ_OVERRUN BIT1 // receive frame overflow
305 #define IRQ_RXFIFO BIT0 // receive pool full
309 #define XFW BIT6 // transmit FIFO write enable
310 #define CEC BIT2 // command executing
311 #define CTS BIT1 // CTS state
316 #define PVR_AUTOCTS BIT3
317 #define PVR_RS232 0x20 /* 0010b */
318 #define PVR_V35 0xe0 /* 1110b */
319 #define PVR_RS422 0x40 /* 0100b */
321 /* Register access functions */
323 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
324 #define read_reg(info, reg) inb((info)->io_base + (reg))
326 #define read_reg16(info, reg) inw((info)->io_base + (reg))
327 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
329 #define set_reg_bits(info, reg, mask) \
330 write_reg(info, (reg), \
331 (unsigned char) (read_reg(info, (reg)) | (mask)))
332 #define clear_reg_bits(info, reg, mask) \
333 write_reg(info, (reg), \
334 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
336 * interrupt enable/disable routines
338 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
340 if (channel == CHA) {
341 info->imra_value |= mask;
342 write_reg16(info, CHA + IMR, info->imra_value);
344 info->imrb_value |= mask;
345 write_reg16(info, CHB + IMR, info->imrb_value);
348 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
350 if (channel == CHA) {
351 info->imra_value &= ~mask;
352 write_reg16(info, CHA + IMR, info->imra_value);
354 info->imrb_value &= ~mask;
355 write_reg16(info, CHB + IMR, info->imrb_value);
359 #define port_irq_disable(info, mask) \
360 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
362 #define port_irq_enable(info, mask) \
363 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
365 static void rx_start(MGSLPC_INFO *info);
366 static void rx_stop(MGSLPC_INFO *info);
368 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
369 static void tx_stop(MGSLPC_INFO *info);
370 static void tx_set_idle(MGSLPC_INFO *info);
372 static void get_signals(MGSLPC_INFO *info);
373 static void set_signals(MGSLPC_INFO *info);
375 static void reset_device(MGSLPC_INFO *info);
377 static void hdlc_mode(MGSLPC_INFO *info);
378 static void async_mode(MGSLPC_INFO *info);
380 static void tx_timeout(unsigned long context);
382 static int carrier_raised(struct tty_port *port);
383 static void dtr_rts(struct tty_port *port, int onoff);
385 #if SYNCLINK_GENERIC_HDLC
386 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
387 static void hdlcdev_tx_done(MGSLPC_INFO *info);
388 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
389 static int hdlcdev_init(MGSLPC_INFO *info);
390 static void hdlcdev_exit(MGSLPC_INFO *info);
393 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
395 static bool register_test(MGSLPC_INFO *info);
396 static bool irq_test(MGSLPC_INFO *info);
397 static int adapter_test(MGSLPC_INFO *info);
399 static int claim_resources(MGSLPC_INFO *info);
400 static void release_resources(MGSLPC_INFO *info);
401 static void mgslpc_add_device(MGSLPC_INFO *info);
402 static void mgslpc_remove_device(MGSLPC_INFO *info);
404 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
405 static void rx_reset_buffers(MGSLPC_INFO *info);
406 static int rx_alloc_buffers(MGSLPC_INFO *info);
407 static void rx_free_buffers(MGSLPC_INFO *info);
409 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
412 * Bottom half interrupt handlers
414 static void bh_handler(struct work_struct *work);
415 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
416 static void bh_status(MGSLPC_INFO *info);
421 static int tiocmget(struct tty_struct *tty, struct file *file);
422 static int tiocmset(struct tty_struct *tty, struct file *file,
423 unsigned int set, unsigned int clear);
424 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
425 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
426 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
427 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
428 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
429 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
430 static int tx_abort(MGSLPC_INFO *info);
431 static int set_rxenable(MGSLPC_INFO *info, int enable);
432 static int wait_events(MGSLPC_INFO *info, int __user *mask);
434 static MGSLPC_INFO *mgslpc_device_list = NULL;
435 static int mgslpc_device_count = 0;
438 * Set this param to non-zero to load eax with the
439 * .text section address and breakpoint on module load.
440 * This is useful for use with gdb and add-symbol-file command.
442 static int break_on_load=0;
445 * Driver major number, defaults to zero to get auto
446 * assigned major number. May be forced as module parameter.
448 static int ttymajor=0;
450 static int debug_level = 0;
451 static int maxframe[MAX_DEVICE_COUNT] = {0,};
453 module_param(break_on_load, bool, 0);
454 module_param(ttymajor, int, 0);
455 module_param(debug_level, int, 0);
456 module_param_array(maxframe, int, NULL, 0);
458 MODULE_LICENSE("GPL");
460 static char *driver_name = "SyncLink PC Card driver";
461 static char *driver_version = "$Revision: 4.34 $";
463 static struct tty_driver *serial_driver;
465 /* number of characters left in xmit buffer before we ask for more */
466 #define WAKEUP_CHARS 256
468 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
469 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
471 /* PCMCIA prototypes */
473 static int mgslpc_config(struct pcmcia_device *link);
474 static void mgslpc_release(u_long arg);
475 static void mgslpc_detach(struct pcmcia_device *p_dev);
478 * 1st function defined in .text section. Calling this function in
479 * init_module() followed by a breakpoint allows a remote debugger
480 * (gdb) to get the .text address for the add-symbol-file command.
481 * This allows remote debugging of dynamically loadable modules.
483 static void* mgslpc_get_text_ptr(void)
485 return mgslpc_get_text_ptr;
489 * line discipline callback wrappers
491 * The wrappers maintain line discipline references
492 * while calling into the line discipline.
494 * ldisc_receive_buf - pass receive data to line discipline
497 static void ldisc_receive_buf(struct tty_struct *tty,
498 const __u8 *data, char *flags, int count)
500 struct tty_ldisc *ld;
503 ld = tty_ldisc_ref(tty);
505 if (ld->ops->receive_buf)
506 ld->ops->receive_buf(tty, data, flags, count);
511 static const struct tty_port_operations mgslpc_port_ops = {
512 .carrier_raised = carrier_raised,
516 static int mgslpc_probe(struct pcmcia_device *link)
521 if (debug_level >= DEBUG_LEVEL_INFO)
522 printk("mgslpc_attach\n");
524 info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
526 printk("Error can't allocate device instance data\n");
530 info->magic = MGSLPC_MAGIC;
531 tty_port_init(&info->port);
532 info->port.ops = &mgslpc_port_ops;
533 INIT_WORK(&info->task, bh_handler);
534 info->max_frame_size = 4096;
535 info->port.close_delay = 5*HZ/10;
536 info->port.closing_wait = 30*HZ;
537 init_waitqueue_head(&info->status_event_wait_q);
538 init_waitqueue_head(&info->event_wait_q);
539 spin_lock_init(&info->lock);
540 spin_lock_init(&info->netlock);
541 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
542 info->idle_mode = HDLC_TXIDLE_FLAGS;
543 info->imra_value = 0xffff;
544 info->imrb_value = 0xffff;
545 info->pim_value = 0xff;
550 /* Initialize the struct pcmcia_device structure */
552 ret = mgslpc_config(link);
556 mgslpc_add_device(info);
561 /* Card has been inserted.
564 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
566 return pcmcia_request_io(p_dev);
569 static int mgslpc_config(struct pcmcia_device *link)
571 MGSLPC_INFO *info = link->priv;
574 if (debug_level >= DEBUG_LEVEL_INFO)
575 printk("mgslpc_config(0x%p)\n", link);
577 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
579 ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
583 link->config_index = 8;
584 link->config_regs = PRESENT_OPTION;
586 ret = pcmcia_request_irq(link, mgslpc_isr);
589 ret = pcmcia_enable_device(link);
593 info->io_base = link->resource[0]->start;
594 info->irq_level = link->irq;
596 dev_info(&link->dev, "index 0x%02x:",
598 printk(", irq %d", link->irq);
599 if (link->resource[0])
600 printk(", io %pR", link->resource[0]);
605 mgslpc_release((u_long)link);
609 /* Card has been removed.
610 * Unregister device and release PCMCIA configuration.
611 * If device is open, postpone until it is closed.
613 static void mgslpc_release(u_long arg)
615 struct pcmcia_device *link = (struct pcmcia_device *)arg;
617 if (debug_level >= DEBUG_LEVEL_INFO)
618 printk("mgslpc_release(0x%p)\n", link);
620 pcmcia_disable_device(link);
623 static void mgslpc_detach(struct pcmcia_device *link)
625 if (debug_level >= DEBUG_LEVEL_INFO)
626 printk("mgslpc_detach(0x%p)\n", link);
628 ((MGSLPC_INFO *)link->priv)->stop = 1;
629 mgslpc_release((u_long)link);
631 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
634 static int mgslpc_suspend(struct pcmcia_device *link)
636 MGSLPC_INFO *info = link->priv;
643 static int mgslpc_resume(struct pcmcia_device *link)
645 MGSLPC_INFO *info = link->priv;
653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
654 char *name, const char *routine)
656 #ifdef MGSLPC_PARANOIA_CHECK
657 static const char *badmagic =
658 "Warning: bad magic number for mgsl struct (%s) in %s\n";
659 static const char *badinfo =
660 "Warning: null mgslpc_info for (%s) in %s\n";
663 printk(badinfo, name, routine);
666 if (info->magic != MGSLPC_MAGIC) {
667 printk(badmagic, name, routine);
678 #define CMD_RXFIFO BIT7 // release current rx FIFO
679 #define CMD_RXRESET BIT6 // receiver reset
680 #define CMD_RXFIFO_READ BIT5
681 #define CMD_START_TIMER BIT4
682 #define CMD_TXFIFO BIT3 // release current tx FIFO
683 #define CMD_TXEOM BIT1 // transmit end message
684 #define CMD_TXRESET BIT0 // transmit reset
686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
689 /* wait for command completion */
690 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
700 wait_command_complete(info, channel);
701 write_reg(info, (unsigned char) (channel + CMDR), cmd);
704 static void tx_pause(struct tty_struct *tty)
706 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
709 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
711 if (debug_level >= DEBUG_LEVEL_INFO)
712 printk("tx_pause(%s)\n",info->device_name);
714 spin_lock_irqsave(&info->lock,flags);
715 if (info->tx_enabled)
717 spin_unlock_irqrestore(&info->lock,flags);
720 static void tx_release(struct tty_struct *tty)
722 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
725 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
727 if (debug_level >= DEBUG_LEVEL_INFO)
728 printk("tx_release(%s)\n",info->device_name);
730 spin_lock_irqsave(&info->lock,flags);
731 if (!info->tx_enabled)
733 spin_unlock_irqrestore(&info->lock,flags);
736 /* Return next bottom half action to perform.
737 * or 0 if nothing to do.
739 static int bh_action(MGSLPC_INFO *info)
744 spin_lock_irqsave(&info->lock,flags);
746 if (info->pending_bh & BH_RECEIVE) {
747 info->pending_bh &= ~BH_RECEIVE;
749 } else if (info->pending_bh & BH_TRANSMIT) {
750 info->pending_bh &= ~BH_TRANSMIT;
752 } else if (info->pending_bh & BH_STATUS) {
753 info->pending_bh &= ~BH_STATUS;
758 /* Mark BH routine as complete */
759 info->bh_running = false;
760 info->bh_requested = false;
763 spin_unlock_irqrestore(&info->lock,flags);
768 static void bh_handler(struct work_struct *work)
770 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
771 struct tty_struct *tty;
777 if (debug_level >= DEBUG_LEVEL_BH)
778 printk( "%s(%d):bh_handler(%s) entry\n",
779 __FILE__,__LINE__,info->device_name);
781 info->bh_running = true;
782 tty = tty_port_tty_get(&info->port);
784 while((action = bh_action(info)) != 0) {
786 /* Process work item */
787 if ( debug_level >= DEBUG_LEVEL_BH )
788 printk( "%s(%d):bh_handler() work item action=%d\n",
789 __FILE__,__LINE__,action);
794 while(rx_get_frame(info, tty));
797 bh_transmit(info, tty);
803 /* unknown work item ID */
804 printk("Unknown work item ID=%08X!\n", action);
810 if (debug_level >= DEBUG_LEVEL_BH)
811 printk( "%s(%d):bh_handler(%s) exit\n",
812 __FILE__,__LINE__,info->device_name);
815 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
817 if (debug_level >= DEBUG_LEVEL_BH)
818 printk("bh_transmit() entry on %s\n", info->device_name);
824 static void bh_status(MGSLPC_INFO *info)
826 info->ri_chkcount = 0;
827 info->dsr_chkcount = 0;
828 info->dcd_chkcount = 0;
829 info->cts_chkcount = 0;
832 /* eom: non-zero = end of frame */
833 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
835 unsigned char data[2];
836 unsigned char fifo_count, read_count, i;
837 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
839 if (debug_level >= DEBUG_LEVEL_ISR)
840 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
842 if (!info->rx_enabled)
845 if (info->rx_frame_count >= info->rx_buf_count) {
846 /* no more free buffers */
847 issue_command(info, CHA, CMD_RXRESET);
848 info->pending_bh |= BH_RECEIVE;
849 info->rx_overflow = true;
850 info->icount.buf_overrun++;
855 /* end of frame, get FIFO count from RBCL register */
856 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
862 if (fifo_count == 1) {
864 data[0] = read_reg(info, CHA + RXFIFO);
867 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
869 fifo_count -= read_count;
870 if (!fifo_count && eom)
871 buf->status = data[--read_count];
873 for (i = 0; i < read_count; i++) {
874 if (buf->count >= info->max_frame_size) {
875 /* frame too large, reset receiver and reset current buffer */
876 issue_command(info, CHA, CMD_RXRESET);
880 *(buf->data + buf->count) = data[i];
883 } while (fifo_count);
886 info->pending_bh |= BH_RECEIVE;
887 info->rx_frame_count++;
889 if (info->rx_put >= info->rx_buf_count)
892 issue_command(info, CHA, CMD_RXFIFO);
895 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
897 unsigned char data, status, flag;
900 struct mgsl_icount *icount = &info->icount;
903 /* early termination, get FIFO count from RBCL register */
904 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
906 /* Zero fifo count could mean 0 or 32 bytes available.
907 * If BIT5 of STAR is set then at least 1 byte is available.
909 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
914 tty_buffer_request_room(tty, fifo_count);
915 /* Flush received async data to receive data buffer. */
917 data = read_reg(info, CHA + RXFIFO);
918 status = read_reg(info, CHA + RXFIFO);
924 // if no frameing/crc error then save data
926 // BIT6:framing error
928 if (status & (BIT7 + BIT6)) {
934 /* discard char if tty control flags say so */
935 if (status & info->ignore_status_mask)
938 status &= info->read_status_mask;
942 else if (status & BIT6)
945 work += tty_insert_flip_char(tty, data, flag);
947 issue_command(info, CHA, CMD_RXFIFO);
949 if (debug_level >= DEBUG_LEVEL_ISR) {
950 printk("%s(%d):rx_ready_async",
952 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
953 __FILE__,__LINE__,icount->rx,icount->brk,
954 icount->parity,icount->frame,icount->overrun);
958 tty_flip_buffer_push(tty);
962 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
964 if (!info->tx_active)
967 info->tx_active = false;
968 info->tx_aborting = false;
970 if (info->params.mode == MGSL_MODE_ASYNC)
973 info->tx_count = info->tx_put = info->tx_get = 0;
974 del_timer(&info->tx_timer);
976 if (info->drop_rts_on_tx_done) {
978 if (info->serial_signals & SerialSignal_RTS) {
979 info->serial_signals &= ~SerialSignal_RTS;
982 info->drop_rts_on_tx_done = false;
985 #if SYNCLINK_GENERIC_HDLC
987 hdlcdev_tx_done(info);
991 if (tty->stopped || tty->hw_stopped) {
995 info->pending_bh |= BH_TRANSMIT;
999 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1001 unsigned char fifo_count = 32;
1004 if (debug_level >= DEBUG_LEVEL_ISR)
1005 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1007 if (info->params.mode == MGSL_MODE_HDLC) {
1008 if (!info->tx_active)
1011 if (tty->stopped || tty->hw_stopped) {
1015 if (!info->tx_count)
1016 info->tx_active = false;
1019 if (!info->tx_count)
1022 while (info->tx_count && fifo_count) {
1023 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1026 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1028 write_reg16(info, CHA + TXFIFO,
1029 *((unsigned short*)(info->tx_buf + info->tx_get)));
1031 info->tx_count -= c;
1032 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1036 if (info->params.mode == MGSL_MODE_ASYNC) {
1037 if (info->tx_count < WAKEUP_CHARS)
1038 info->pending_bh |= BH_TRANSMIT;
1039 issue_command(info, CHA, CMD_TXFIFO);
1042 issue_command(info, CHA, CMD_TXFIFO);
1044 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1048 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1051 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1052 irq_disable(info, CHB, IRQ_CTS);
1054 if (info->serial_signals & SerialSignal_CTS)
1055 info->input_signal_events.cts_up++;
1057 info->input_signal_events.cts_down++;
1058 wake_up_interruptible(&info->status_event_wait_q);
1059 wake_up_interruptible(&info->event_wait_q);
1061 if (info->port.flags & ASYNC_CTS_FLOW) {
1062 if (tty->hw_stopped) {
1063 if (info->serial_signals & SerialSignal_CTS) {
1064 if (debug_level >= DEBUG_LEVEL_ISR)
1065 printk("CTS tx start...");
1067 tty->hw_stopped = 0;
1068 tx_start(info, tty);
1069 info->pending_bh |= BH_TRANSMIT;
1073 if (!(info->serial_signals & SerialSignal_CTS)) {
1074 if (debug_level >= DEBUG_LEVEL_ISR)
1075 printk("CTS tx stop...");
1077 tty->hw_stopped = 1;
1082 info->pending_bh |= BH_STATUS;
1085 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1088 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1089 irq_disable(info, CHB, IRQ_DCD);
1091 if (info->serial_signals & SerialSignal_DCD) {
1092 info->input_signal_events.dcd_up++;
1095 info->input_signal_events.dcd_down++;
1096 #if SYNCLINK_GENERIC_HDLC
1097 if (info->netcount) {
1098 if (info->serial_signals & SerialSignal_DCD)
1099 netif_carrier_on(info->netdev);
1101 netif_carrier_off(info->netdev);
1104 wake_up_interruptible(&info->status_event_wait_q);
1105 wake_up_interruptible(&info->event_wait_q);
1107 if (info->port.flags & ASYNC_CHECK_CD) {
1108 if (debug_level >= DEBUG_LEVEL_ISR)
1109 printk("%s CD now %s...", info->device_name,
1110 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1111 if (info->serial_signals & SerialSignal_DCD)
1112 wake_up_interruptible(&info->port.open_wait);
1114 if (debug_level >= DEBUG_LEVEL_ISR)
1115 printk("doing serial hangup...");
1120 info->pending_bh |= BH_STATUS;
1123 static void dsr_change(MGSLPC_INFO *info)
1126 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1127 port_irq_disable(info, PVR_DSR);
1129 if (info->serial_signals & SerialSignal_DSR)
1130 info->input_signal_events.dsr_up++;
1132 info->input_signal_events.dsr_down++;
1133 wake_up_interruptible(&info->status_event_wait_q);
1134 wake_up_interruptible(&info->event_wait_q);
1135 info->pending_bh |= BH_STATUS;
1138 static void ri_change(MGSLPC_INFO *info)
1141 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1142 port_irq_disable(info, PVR_RI);
1144 if (info->serial_signals & SerialSignal_RI)
1145 info->input_signal_events.ri_up++;
1147 info->input_signal_events.ri_down++;
1148 wake_up_interruptible(&info->status_event_wait_q);
1149 wake_up_interruptible(&info->event_wait_q);
1150 info->pending_bh |= BH_STATUS;
1153 /* Interrupt service routine entry point.
1157 * irq interrupt number that caused interrupt
1158 * dev_id device ID supplied during interrupt registration
1160 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1162 MGSLPC_INFO *info = dev_id;
1163 struct tty_struct *tty;
1165 unsigned char gis, pis;
1168 if (debug_level >= DEBUG_LEVEL_ISR)
1169 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1171 if (!(info->p_dev->_locked))
1174 tty = tty_port_tty_get(&info->port);
1176 spin_lock(&info->lock);
1178 while ((gis = read_reg(info, CHA + GIS))) {
1179 if (debug_level >= DEBUG_LEVEL_ISR)
1180 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1182 if ((gis & 0x70) || count > 1000) {
1183 printk("synclink_cs:hardware failed or ejected\n");
1188 if (gis & (BIT1 + BIT0)) {
1189 isr = read_reg16(info, CHB + ISR);
1191 dcd_change(info, tty);
1193 cts_change(info, tty);
1195 if (gis & (BIT3 + BIT2))
1197 isr = read_reg16(info, CHA + ISR);
1198 if (isr & IRQ_TIMER) {
1199 info->irq_occurred = true;
1200 irq_disable(info, CHA, IRQ_TIMER);
1204 if (isr & IRQ_EXITHUNT) {
1205 info->icount.exithunt++;
1206 wake_up_interruptible(&info->event_wait_q);
1208 if (isr & IRQ_BREAK_ON) {
1210 if (info->port.flags & ASYNC_SAK)
1213 if (isr & IRQ_RXTIME) {
1214 issue_command(info, CHA, CMD_RXFIFO_READ);
1216 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1217 if (info->params.mode == MGSL_MODE_HDLC)
1218 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1220 rx_ready_async(info, isr & IRQ_RXEOM, tty);
1224 if (isr & IRQ_UNDERRUN) {
1225 if (info->tx_aborting)
1226 info->icount.txabort++;
1228 info->icount.txunder++;
1231 else if (isr & IRQ_ALLSENT) {
1232 info->icount.txok++;
1235 else if (isr & IRQ_TXFIFO)
1236 tx_ready(info, tty);
1239 pis = read_reg(info, CHA + PIS);
1247 /* Request bottom half processing if there's something
1248 * for it to do and the bh is not already running
1251 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1252 if ( debug_level >= DEBUG_LEVEL_ISR )
1253 printk("%s(%d):%s queueing bh task.\n",
1254 __FILE__,__LINE__,info->device_name);
1255 schedule_work(&info->task);
1256 info->bh_requested = true;
1259 spin_unlock(&info->lock);
1262 if (debug_level >= DEBUG_LEVEL_ISR)
1263 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1264 __FILE__, __LINE__, info->irq_level);
1269 /* Initialize and start device.
1271 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1275 if (debug_level >= DEBUG_LEVEL_INFO)
1276 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1278 if (info->port.flags & ASYNC_INITIALIZED)
1281 if (!info->tx_buf) {
1282 /* allocate a page of memory for a transmit buffer */
1283 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1284 if (!info->tx_buf) {
1285 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1286 __FILE__,__LINE__,info->device_name);
1291 info->pending_bh = 0;
1293 memset(&info->icount, 0, sizeof(info->icount));
1295 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1297 /* Allocate and claim adapter resources */
1298 retval = claim_resources(info);
1300 /* perform existance check and diagnostics */
1302 retval = adapter_test(info);
1305 if (capable(CAP_SYS_ADMIN) && tty)
1306 set_bit(TTY_IO_ERROR, &tty->flags);
1307 release_resources(info);
1311 /* program hardware for current parameters */
1312 mgslpc_change_params(info, tty);
1315 clear_bit(TTY_IO_ERROR, &tty->flags);
1317 info->port.flags |= ASYNC_INITIALIZED;
1322 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1324 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1326 unsigned long flags;
1328 if (!(info->port.flags & ASYNC_INITIALIZED))
1331 if (debug_level >= DEBUG_LEVEL_INFO)
1332 printk("%s(%d):mgslpc_shutdown(%s)\n",
1333 __FILE__,__LINE__, info->device_name );
1335 /* clear status wait queue because status changes */
1336 /* can't happen after shutting down the hardware */
1337 wake_up_interruptible(&info->status_event_wait_q);
1338 wake_up_interruptible(&info->event_wait_q);
1340 del_timer_sync(&info->tx_timer);
1343 free_page((unsigned long) info->tx_buf);
1344 info->tx_buf = NULL;
1347 spin_lock_irqsave(&info->lock,flags);
1352 /* TODO:disable interrupts instead of reset to preserve signal states */
1355 if (!tty || tty->termios->c_cflag & HUPCL) {
1356 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1360 spin_unlock_irqrestore(&info->lock,flags);
1362 release_resources(info);
1365 set_bit(TTY_IO_ERROR, &tty->flags);
1367 info->port.flags &= ~ASYNC_INITIALIZED;
1370 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1372 unsigned long flags;
1374 spin_lock_irqsave(&info->lock,flags);
1378 info->tx_count = info->tx_put = info->tx_get = 0;
1380 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1387 info->dcd_chkcount = 0;
1388 info->cts_chkcount = 0;
1389 info->ri_chkcount = 0;
1390 info->dsr_chkcount = 0;
1392 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1393 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1396 if (info->netcount || (tty && (tty->termios->c_cflag & CREAD)))
1399 spin_unlock_irqrestore(&info->lock,flags);
1402 /* Reconfigure adapter based on new parameters
1404 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1409 if (!tty || !tty->termios)
1412 if (debug_level >= DEBUG_LEVEL_INFO)
1413 printk("%s(%d):mgslpc_change_params(%s)\n",
1414 __FILE__,__LINE__, info->device_name );
1416 cflag = tty->termios->c_cflag;
1418 /* if B0 rate (hangup) specified then negate DTR and RTS */
1419 /* otherwise assert DTR and RTS */
1421 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1423 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1425 /* byte size and parity */
1427 switch (cflag & CSIZE) {
1428 case CS5: info->params.data_bits = 5; break;
1429 case CS6: info->params.data_bits = 6; break;
1430 case CS7: info->params.data_bits = 7; break;
1431 case CS8: info->params.data_bits = 8; break;
1432 default: info->params.data_bits = 7; break;
1436 info->params.stop_bits = 2;
1438 info->params.stop_bits = 1;
1440 info->params.parity = ASYNC_PARITY_NONE;
1441 if (cflag & PARENB) {
1443 info->params.parity = ASYNC_PARITY_ODD;
1445 info->params.parity = ASYNC_PARITY_EVEN;
1448 info->params.parity = ASYNC_PARITY_SPACE;
1452 /* calculate number of jiffies to transmit a full
1453 * FIFO (32 bytes) at specified data rate
1455 bits_per_char = info->params.data_bits +
1456 info->params.stop_bits + 1;
1458 /* if port data rate is set to 460800 or less then
1459 * allow tty settings to override, otherwise keep the
1460 * current data rate.
1462 if (info->params.data_rate <= 460800) {
1463 info->params.data_rate = tty_get_baud_rate(tty);
1466 if ( info->params.data_rate ) {
1467 info->timeout = (32*HZ*bits_per_char) /
1468 info->params.data_rate;
1470 info->timeout += HZ/50; /* Add .02 seconds of slop */
1472 if (cflag & CRTSCTS)
1473 info->port.flags |= ASYNC_CTS_FLOW;
1475 info->port.flags &= ~ASYNC_CTS_FLOW;
1478 info->port.flags &= ~ASYNC_CHECK_CD;
1480 info->port.flags |= ASYNC_CHECK_CD;
1482 /* process tty input control flags */
1484 info->read_status_mask = 0;
1486 info->read_status_mask |= BIT7 | BIT6;
1488 info->ignore_status_mask |= BIT7 | BIT6;
1490 mgslpc_program_hw(info, tty);
1493 /* Add a character to the transmit buffer
1495 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1497 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1498 unsigned long flags;
1500 if (debug_level >= DEBUG_LEVEL_INFO) {
1501 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1502 __FILE__,__LINE__,ch,info->device_name);
1505 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1511 spin_lock_irqsave(&info->lock,flags);
1513 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1514 if (info->tx_count < TXBUFSIZE - 1) {
1515 info->tx_buf[info->tx_put++] = ch;
1516 info->tx_put &= TXBUFSIZE-1;
1521 spin_unlock_irqrestore(&info->lock,flags);
1525 /* Enable transmitter so remaining characters in the
1526 * transmit buffer are sent.
1528 static void mgslpc_flush_chars(struct tty_struct *tty)
1530 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1531 unsigned long flags;
1533 if (debug_level >= DEBUG_LEVEL_INFO)
1534 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1535 __FILE__,__LINE__,info->device_name,info->tx_count);
1537 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1540 if (info->tx_count <= 0 || tty->stopped ||
1541 tty->hw_stopped || !info->tx_buf)
1544 if (debug_level >= DEBUG_LEVEL_INFO)
1545 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1546 __FILE__,__LINE__,info->device_name);
1548 spin_lock_irqsave(&info->lock,flags);
1549 if (!info->tx_active)
1550 tx_start(info, tty);
1551 spin_unlock_irqrestore(&info->lock,flags);
1554 /* Send a block of data
1558 * tty pointer to tty information structure
1559 * buf pointer to buffer containing send data
1560 * count size of send data in bytes
1562 * Returns: number of characters written
1564 static int mgslpc_write(struct tty_struct * tty,
1565 const unsigned char *buf, int count)
1568 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1569 unsigned long flags;
1571 if (debug_level >= DEBUG_LEVEL_INFO)
1572 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1573 __FILE__,__LINE__,info->device_name,count);
1575 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1579 if (info->params.mode == MGSL_MODE_HDLC) {
1580 if (count > TXBUFSIZE) {
1584 if (info->tx_active)
1586 else if (info->tx_count)
1592 min(TXBUFSIZE - info->tx_count - 1,
1593 TXBUFSIZE - info->tx_put));
1597 memcpy(info->tx_buf + info->tx_put, buf, c);
1599 spin_lock_irqsave(&info->lock,flags);
1600 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1601 info->tx_count += c;
1602 spin_unlock_irqrestore(&info->lock,flags);
1609 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1610 spin_lock_irqsave(&info->lock,flags);
1611 if (!info->tx_active)
1612 tx_start(info, tty);
1613 spin_unlock_irqrestore(&info->lock,flags);
1616 if (debug_level >= DEBUG_LEVEL_INFO)
1617 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1618 __FILE__,__LINE__,info->device_name,ret);
1622 /* Return the count of free bytes in transmit buffer
1624 static int mgslpc_write_room(struct tty_struct *tty)
1626 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1629 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1632 if (info->params.mode == MGSL_MODE_HDLC) {
1633 /* HDLC (frame oriented) mode */
1634 if (info->tx_active)
1637 return HDLC_MAX_FRAME_SIZE;
1639 ret = TXBUFSIZE - info->tx_count - 1;
1644 if (debug_level >= DEBUG_LEVEL_INFO)
1645 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1646 __FILE__,__LINE__, info->device_name, ret);
1650 /* Return the count of bytes in transmit buffer
1652 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1654 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1657 if (debug_level >= DEBUG_LEVEL_INFO)
1658 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1659 __FILE__,__LINE__, info->device_name );
1661 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1664 if (info->params.mode == MGSL_MODE_HDLC)
1665 rc = info->tx_active ? info->max_frame_size : 0;
1667 rc = info->tx_count;
1669 if (debug_level >= DEBUG_LEVEL_INFO)
1670 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1671 __FILE__,__LINE__, info->device_name, rc);
1676 /* Discard all data in the send buffer
1678 static void mgslpc_flush_buffer(struct tty_struct *tty)
1680 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1681 unsigned long flags;
1683 if (debug_level >= DEBUG_LEVEL_INFO)
1684 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1685 __FILE__,__LINE__, info->device_name );
1687 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1690 spin_lock_irqsave(&info->lock,flags);
1691 info->tx_count = info->tx_put = info->tx_get = 0;
1692 del_timer(&info->tx_timer);
1693 spin_unlock_irqrestore(&info->lock,flags);
1695 wake_up_interruptible(&tty->write_wait);
1699 /* Send a high-priority XON/XOFF character
1701 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1703 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1704 unsigned long flags;
1706 if (debug_level >= DEBUG_LEVEL_INFO)
1707 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1708 __FILE__,__LINE__, info->device_name, ch );
1710 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1715 spin_lock_irqsave(&info->lock,flags);
1716 if (!info->tx_enabled)
1717 tx_start(info, tty);
1718 spin_unlock_irqrestore(&info->lock,flags);
1722 /* Signal remote device to throttle send data (our receive data)
1724 static void mgslpc_throttle(struct tty_struct * tty)
1726 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1727 unsigned long flags;
1729 if (debug_level >= DEBUG_LEVEL_INFO)
1730 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1731 __FILE__,__LINE__, info->device_name );
1733 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1737 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1739 if (tty->termios->c_cflag & CRTSCTS) {
1740 spin_lock_irqsave(&info->lock,flags);
1741 info->serial_signals &= ~SerialSignal_RTS;
1743 spin_unlock_irqrestore(&info->lock,flags);
1747 /* Signal remote device to stop throttling send data (our receive data)
1749 static void mgslpc_unthrottle(struct tty_struct * tty)
1751 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1752 unsigned long flags;
1754 if (debug_level >= DEBUG_LEVEL_INFO)
1755 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1756 __FILE__,__LINE__, info->device_name );
1758 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1765 mgslpc_send_xchar(tty, START_CHAR(tty));
1768 if (tty->termios->c_cflag & CRTSCTS) {
1769 spin_lock_irqsave(&info->lock,flags);
1770 info->serial_signals |= SerialSignal_RTS;
1772 spin_unlock_irqrestore(&info->lock,flags);
1776 /* get the current serial statistics
1778 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1781 if (debug_level >= DEBUG_LEVEL_INFO)
1782 printk("get_params(%s)\n", info->device_name);
1784 memset(&info->icount, 0, sizeof(info->icount));
1786 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1793 /* get the current serial parameters
1795 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1798 if (debug_level >= DEBUG_LEVEL_INFO)
1799 printk("get_params(%s)\n", info->device_name);
1800 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1806 /* set the serial parameters
1810 * info pointer to device instance data
1811 * new_params user buffer containing new serial params
1813 * Returns: 0 if success, otherwise error code
1815 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1817 unsigned long flags;
1818 MGSL_PARAMS tmp_params;
1821 if (debug_level >= DEBUG_LEVEL_INFO)
1822 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1823 info->device_name );
1824 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1826 if ( debug_level >= DEBUG_LEVEL_INFO )
1827 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1828 __FILE__,__LINE__,info->device_name);
1832 spin_lock_irqsave(&info->lock,flags);
1833 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1834 spin_unlock_irqrestore(&info->lock,flags);
1836 mgslpc_change_params(info, tty);
1841 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1844 if (debug_level >= DEBUG_LEVEL_INFO)
1845 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1846 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1852 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1854 unsigned long flags;
1855 if (debug_level >= DEBUG_LEVEL_INFO)
1856 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1857 spin_lock_irqsave(&info->lock,flags);
1858 info->idle_mode = idle_mode;
1860 spin_unlock_irqrestore(&info->lock,flags);
1864 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1867 if (debug_level >= DEBUG_LEVEL_INFO)
1868 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1869 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1875 static int set_interface(MGSLPC_INFO * info, int if_mode)
1877 unsigned long flags;
1879 if (debug_level >= DEBUG_LEVEL_INFO)
1880 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1881 spin_lock_irqsave(&info->lock,flags);
1882 info->if_mode = if_mode;
1884 val = read_reg(info, PVR) & 0x0f;
1885 switch (info->if_mode)
1887 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1888 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1889 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1891 write_reg(info, PVR, val);
1893 spin_unlock_irqrestore(&info->lock,flags);
1897 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1899 unsigned long flags;
1901 if (debug_level >= DEBUG_LEVEL_INFO)
1902 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1904 spin_lock_irqsave(&info->lock,flags);
1906 if (!info->tx_enabled)
1907 tx_start(info, tty);
1909 if (info->tx_enabled)
1912 spin_unlock_irqrestore(&info->lock,flags);
1916 static int tx_abort(MGSLPC_INFO * info)
1918 unsigned long flags;
1920 if (debug_level >= DEBUG_LEVEL_INFO)
1921 printk("tx_abort(%s)\n", info->device_name);
1923 spin_lock_irqsave(&info->lock,flags);
1924 if (info->tx_active && info->tx_count &&
1925 info->params.mode == MGSL_MODE_HDLC) {
1926 /* clear data count so FIFO is not filled on next IRQ.
1927 * This results in underrun and abort transmission.
1929 info->tx_count = info->tx_put = info->tx_get = 0;
1930 info->tx_aborting = true;
1932 spin_unlock_irqrestore(&info->lock,flags);
1936 static int set_rxenable(MGSLPC_INFO * info, int enable)
1938 unsigned long flags;
1940 if (debug_level >= DEBUG_LEVEL_INFO)
1941 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1943 spin_lock_irqsave(&info->lock,flags);
1945 if (!info->rx_enabled)
1948 if (info->rx_enabled)
1951 spin_unlock_irqrestore(&info->lock,flags);
1955 /* wait for specified event to occur
1957 * Arguments: info pointer to device instance data
1958 * mask pointer to bitmask of events to wait for
1959 * Return Value: 0 if successful and bit mask updated with
1960 * of events triggerred,
1961 * otherwise error code
1963 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1965 unsigned long flags;
1968 struct mgsl_icount cprev, cnow;
1971 struct _input_signal_events oldsigs, newsigs;
1972 DECLARE_WAITQUEUE(wait, current);
1974 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1978 if (debug_level >= DEBUG_LEVEL_INFO)
1979 printk("wait_events(%s,%d)\n", info->device_name, mask);
1981 spin_lock_irqsave(&info->lock,flags);
1983 /* return immediately if state matches requested events */
1985 s = info->serial_signals;
1987 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1988 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1989 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1990 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1992 spin_unlock_irqrestore(&info->lock,flags);
1996 /* save current irq counts */
1997 cprev = info->icount;
1998 oldsigs = info->input_signal_events;
2000 if ((info->params.mode == MGSL_MODE_HDLC) &&
2001 (mask & MgslEvent_ExitHuntMode))
2002 irq_enable(info, CHA, IRQ_EXITHUNT);
2004 set_current_state(TASK_INTERRUPTIBLE);
2005 add_wait_queue(&info->event_wait_q, &wait);
2007 spin_unlock_irqrestore(&info->lock,flags);
2012 if (signal_pending(current)) {
2017 /* get current irq counts */
2018 spin_lock_irqsave(&info->lock,flags);
2019 cnow = info->icount;
2020 newsigs = info->input_signal_events;
2021 set_current_state(TASK_INTERRUPTIBLE);
2022 spin_unlock_irqrestore(&info->lock,flags);
2024 /* if no change, wait aborted for some reason */
2025 if (newsigs.dsr_up == oldsigs.dsr_up &&
2026 newsigs.dsr_down == oldsigs.dsr_down &&
2027 newsigs.dcd_up == oldsigs.dcd_up &&
2028 newsigs.dcd_down == oldsigs.dcd_down &&
2029 newsigs.cts_up == oldsigs.cts_up &&
2030 newsigs.cts_down == oldsigs.cts_down &&
2031 newsigs.ri_up == oldsigs.ri_up &&
2032 newsigs.ri_down == oldsigs.ri_down &&
2033 cnow.exithunt == cprev.exithunt &&
2034 cnow.rxidle == cprev.rxidle) {
2040 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2041 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2042 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2043 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2044 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2045 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2046 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2047 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2048 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2049 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2057 remove_wait_queue(&info->event_wait_q, &wait);
2058 set_current_state(TASK_RUNNING);
2060 if (mask & MgslEvent_ExitHuntMode) {
2061 spin_lock_irqsave(&info->lock,flags);
2062 if (!waitqueue_active(&info->event_wait_q))
2063 irq_disable(info, CHA, IRQ_EXITHUNT);
2064 spin_unlock_irqrestore(&info->lock,flags);
2068 PUT_USER(rc, events, mask_ptr);
2072 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2074 unsigned long flags;
2076 struct mgsl_icount cprev, cnow;
2077 DECLARE_WAITQUEUE(wait, current);
2079 /* save current irq counts */
2080 spin_lock_irqsave(&info->lock,flags);
2081 cprev = info->icount;
2082 add_wait_queue(&info->status_event_wait_q, &wait);
2083 set_current_state(TASK_INTERRUPTIBLE);
2084 spin_unlock_irqrestore(&info->lock,flags);
2088 if (signal_pending(current)) {
2093 /* get new irq counts */
2094 spin_lock_irqsave(&info->lock,flags);
2095 cnow = info->icount;
2096 set_current_state(TASK_INTERRUPTIBLE);
2097 spin_unlock_irqrestore(&info->lock,flags);
2099 /* if no change, wait aborted for some reason */
2100 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2101 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2106 /* check for change in caller specified modem input */
2107 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2108 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2109 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2110 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2117 remove_wait_queue(&info->status_event_wait_q, &wait);
2118 set_current_state(TASK_RUNNING);
2122 /* return the state of the serial control and status signals
2124 static int tiocmget(struct tty_struct *tty, struct file *file)
2126 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2127 unsigned int result;
2128 unsigned long flags;
2130 spin_lock_irqsave(&info->lock,flags);
2132 spin_unlock_irqrestore(&info->lock,flags);
2134 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2135 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2136 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2137 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2138 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2139 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2141 if (debug_level >= DEBUG_LEVEL_INFO)
2142 printk("%s(%d):%s tiocmget() value=%08X\n",
2143 __FILE__,__LINE__, info->device_name, result );
2147 /* set modem control signals (DTR/RTS)
2149 static int tiocmset(struct tty_struct *tty, struct file *file,
2150 unsigned int set, unsigned int clear)
2152 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2153 unsigned long flags;
2155 if (debug_level >= DEBUG_LEVEL_INFO)
2156 printk("%s(%d):%s tiocmset(%x,%x)\n",
2157 __FILE__,__LINE__,info->device_name, set, clear);
2159 if (set & TIOCM_RTS)
2160 info->serial_signals |= SerialSignal_RTS;
2161 if (set & TIOCM_DTR)
2162 info->serial_signals |= SerialSignal_DTR;
2163 if (clear & TIOCM_RTS)
2164 info->serial_signals &= ~SerialSignal_RTS;
2165 if (clear & TIOCM_DTR)
2166 info->serial_signals &= ~SerialSignal_DTR;
2168 spin_lock_irqsave(&info->lock,flags);
2170 spin_unlock_irqrestore(&info->lock,flags);
2175 /* Set or clear transmit break condition
2177 * Arguments: tty pointer to tty instance data
2178 * break_state -1=set break condition, 0=clear
2180 static int mgslpc_break(struct tty_struct *tty, int break_state)
2182 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2183 unsigned long flags;
2185 if (debug_level >= DEBUG_LEVEL_INFO)
2186 printk("%s(%d):mgslpc_break(%s,%d)\n",
2187 __FILE__,__LINE__, info->device_name, break_state);
2189 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2192 spin_lock_irqsave(&info->lock,flags);
2193 if (break_state == -1)
2194 set_reg_bits(info, CHA+DAFO, BIT6);
2196 clear_reg_bits(info, CHA+DAFO, BIT6);
2197 spin_unlock_irqrestore(&info->lock,flags);
2201 /* Service an IOCTL request
2205 * tty pointer to tty instance data
2206 * file pointer to associated file object for device
2207 * cmd IOCTL command code
2208 * arg command argument/context
2210 * Return Value: 0 if success, otherwise error code
2212 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2213 unsigned int cmd, unsigned long arg)
2215 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2217 struct mgsl_icount cnow; /* kernel counter temps */
2218 struct serial_icounter_struct __user *p_cuser; /* user space */
2219 void __user *argp = (void __user *)arg;
2220 unsigned long flags;
2222 if (debug_level >= DEBUG_LEVEL_INFO)
2223 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2224 info->device_name, cmd );
2226 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2229 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2230 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2231 if (tty->flags & (1 << TTY_IO_ERROR))
2236 case MGSL_IOCGPARAMS:
2237 return get_params(info, argp);
2238 case MGSL_IOCSPARAMS:
2239 return set_params(info, argp, tty);
2240 case MGSL_IOCGTXIDLE:
2241 return get_txidle(info, argp);
2242 case MGSL_IOCSTXIDLE:
2243 return set_txidle(info, (int)arg);
2245 return get_interface(info, argp);
2247 return set_interface(info,(int)arg);
2248 case MGSL_IOCTXENABLE:
2249 return set_txenable(info,(int)arg, tty);
2250 case MGSL_IOCRXENABLE:
2251 return set_rxenable(info,(int)arg);
2252 case MGSL_IOCTXABORT:
2253 return tx_abort(info);
2254 case MGSL_IOCGSTATS:
2255 return get_stats(info, argp);
2256 case MGSL_IOCWAITEVENT:
2257 return wait_events(info, argp);
2259 return modem_input_wait(info,(int)arg);
2261 spin_lock_irqsave(&info->lock,flags);
2262 cnow = info->icount;
2263 spin_unlock_irqrestore(&info->lock,flags);
2265 PUT_USER(error,cnow.cts, &p_cuser->cts);
2266 if (error) return error;
2267 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2268 if (error) return error;
2269 PUT_USER(error,cnow.rng, &p_cuser->rng);
2270 if (error) return error;
2271 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2272 if (error) return error;
2273 PUT_USER(error,cnow.rx, &p_cuser->rx);
2274 if (error) return error;
2275 PUT_USER(error,cnow.tx, &p_cuser->tx);
2276 if (error) return error;
2277 PUT_USER(error,cnow.frame, &p_cuser->frame);
2278 if (error) return error;
2279 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2280 if (error) return error;
2281 PUT_USER(error,cnow.parity, &p_cuser->parity);
2282 if (error) return error;
2283 PUT_USER(error,cnow.brk, &p_cuser->brk);
2284 if (error) return error;
2285 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2286 if (error) return error;
2289 return -ENOIOCTLCMD;
2294 /* Set new termios settings
2298 * tty pointer to tty structure
2299 * termios pointer to buffer to hold returned old termios
2301 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2303 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2304 unsigned long flags;
2306 if (debug_level >= DEBUG_LEVEL_INFO)
2307 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2308 tty->driver->name );
2310 /* just return if nothing has changed */
2311 if ((tty->termios->c_cflag == old_termios->c_cflag)
2312 && (RELEVANT_IFLAG(tty->termios->c_iflag)
2313 == RELEVANT_IFLAG(old_termios->c_iflag)))
2316 mgslpc_change_params(info, tty);
2318 /* Handle transition to B0 status */
2319 if (old_termios->c_cflag & CBAUD &&
2320 !(tty->termios->c_cflag & CBAUD)) {
2321 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2322 spin_lock_irqsave(&info->lock,flags);
2324 spin_unlock_irqrestore(&info->lock,flags);
2327 /* Handle transition away from B0 status */
2328 if (!(old_termios->c_cflag & CBAUD) &&
2329 tty->termios->c_cflag & CBAUD) {
2330 info->serial_signals |= SerialSignal_DTR;
2331 if (!(tty->termios->c_cflag & CRTSCTS) ||
2332 !test_bit(TTY_THROTTLED, &tty->flags)) {
2333 info->serial_signals |= SerialSignal_RTS;
2335 spin_lock_irqsave(&info->lock,flags);
2337 spin_unlock_irqrestore(&info->lock,flags);
2340 /* Handle turning off CRTSCTS */
2341 if (old_termios->c_cflag & CRTSCTS &&
2342 !(tty->termios->c_cflag & CRTSCTS)) {
2343 tty->hw_stopped = 0;
2348 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2350 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2351 struct tty_port *port = &info->port;
2353 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2356 if (debug_level >= DEBUG_LEVEL_INFO)
2357 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2358 __FILE__,__LINE__, info->device_name, port->count);
2360 WARN_ON(!port->count);
2362 if (tty_port_close_start(port, tty, filp) == 0)
2365 if (port->flags & ASYNC_INITIALIZED)
2366 mgslpc_wait_until_sent(tty, info->timeout);
2368 mgslpc_flush_buffer(tty);
2370 tty_ldisc_flush(tty);
2371 shutdown(info, tty);
2373 tty_port_close_end(port, tty);
2374 tty_port_tty_set(port, NULL);
2376 if (debug_level >= DEBUG_LEVEL_INFO)
2377 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2378 tty->driver->name, port->count);
2381 /* Wait until the transmitter is empty.
2383 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2385 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2386 unsigned long orig_jiffies, char_time;
2391 if (debug_level >= DEBUG_LEVEL_INFO)
2392 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2393 __FILE__,__LINE__, info->device_name );
2395 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2398 if (!(info->port.flags & ASYNC_INITIALIZED))
2401 orig_jiffies = jiffies;
2403 /* Set check interval to 1/5 of estimated time to
2404 * send a character, and make it at least 1. The check
2405 * interval should also be less than the timeout.
2406 * Note: use tight timings here to satisfy the NIST-PCTS.
2409 if ( info->params.data_rate ) {
2410 char_time = info->timeout/(32 * 5);
2417 char_time = min_t(unsigned long, char_time, timeout);
2419 if (info->params.mode == MGSL_MODE_HDLC) {
2420 while (info->tx_active) {
2421 msleep_interruptible(jiffies_to_msecs(char_time));
2422 if (signal_pending(current))
2424 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2428 while ((info->tx_count || info->tx_active) &&
2430 msleep_interruptible(jiffies_to_msecs(char_time));
2431 if (signal_pending(current))
2433 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2439 if (debug_level >= DEBUG_LEVEL_INFO)
2440 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2441 __FILE__,__LINE__, info->device_name );
2444 /* Called by tty_hangup() when a hangup is signaled.
2445 * This is the same as closing all open files for the port.
2447 static void mgslpc_hangup(struct tty_struct *tty)
2449 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2451 if (debug_level >= DEBUG_LEVEL_INFO)
2452 printk("%s(%d):mgslpc_hangup(%s)\n",
2453 __FILE__,__LINE__, info->device_name );
2455 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2458 mgslpc_flush_buffer(tty);
2459 shutdown(info, tty);
2460 tty_port_hangup(&info->port);
2463 static int carrier_raised(struct tty_port *port)
2465 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2466 unsigned long flags;
2468 spin_lock_irqsave(&info->lock,flags);
2470 spin_unlock_irqrestore(&info->lock,flags);
2472 if (info->serial_signals & SerialSignal_DCD)
2477 static void dtr_rts(struct tty_port *port, int onoff)
2479 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2480 unsigned long flags;
2482 spin_lock_irqsave(&info->lock,flags);
2484 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2486 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2488 spin_unlock_irqrestore(&info->lock,flags);
2492 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2495 struct tty_port *port;
2497 unsigned long flags;
2499 /* verify range of specified line number */
2501 if ((line < 0) || (line >= mgslpc_device_count)) {
2502 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2503 __FILE__,__LINE__,line);
2507 /* find the info structure for the specified line */
2508 info = mgslpc_device_list;
2509 while(info && info->line != line)
2510 info = info->next_device;
2511 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2515 tty->driver_data = info;
2516 tty_port_tty_set(port, tty);
2518 if (debug_level >= DEBUG_LEVEL_INFO)
2519 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2520 __FILE__,__LINE__,tty->driver->name, port->count);
2522 /* If port is closing, signal caller to try again */
2523 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2524 if (port->flags & ASYNC_CLOSING)
2525 interruptible_sleep_on(&port->close_wait);
2526 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2527 -EAGAIN : -ERESTARTSYS);
2531 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2533 spin_lock_irqsave(&info->netlock, flags);
2534 if (info->netcount) {
2536 spin_unlock_irqrestore(&info->netlock, flags);
2539 spin_lock(&port->lock);
2541 spin_unlock(&port->lock);
2542 spin_unlock_irqrestore(&info->netlock, flags);
2544 if (port->count == 1) {
2545 /* 1st open on this device, init hardware */
2546 retval = startup(info, tty);
2551 retval = tty_port_block_til_ready(&info->port, tty, filp);
2553 if (debug_level >= DEBUG_LEVEL_INFO)
2554 printk("%s(%d):block_til_ready(%s) returned %d\n",
2555 __FILE__,__LINE__, info->device_name, retval);
2559 if (debug_level >= DEBUG_LEVEL_INFO)
2560 printk("%s(%d):mgslpc_open(%s) success\n",
2561 __FILE__,__LINE__, info->device_name);
2569 * /proc fs routines....
2572 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2575 unsigned long flags;
2577 seq_printf(m, "%s:io:%04X irq:%d",
2578 info->device_name, info->io_base, info->irq_level);
2580 /* output current serial signal states */
2581 spin_lock_irqsave(&info->lock,flags);
2583 spin_unlock_irqrestore(&info->lock,flags);
2587 if (info->serial_signals & SerialSignal_RTS)
2588 strcat(stat_buf, "|RTS");
2589 if (info->serial_signals & SerialSignal_CTS)
2590 strcat(stat_buf, "|CTS");
2591 if (info->serial_signals & SerialSignal_DTR)
2592 strcat(stat_buf, "|DTR");
2593 if (info->serial_signals & SerialSignal_DSR)
2594 strcat(stat_buf, "|DSR");
2595 if (info->serial_signals & SerialSignal_DCD)
2596 strcat(stat_buf, "|CD");
2597 if (info->serial_signals & SerialSignal_RI)
2598 strcat(stat_buf, "|RI");
2600 if (info->params.mode == MGSL_MODE_HDLC) {
2601 seq_printf(m, " HDLC txok:%d rxok:%d",
2602 info->icount.txok, info->icount.rxok);
2603 if (info->icount.txunder)
2604 seq_printf(m, " txunder:%d", info->icount.txunder);
2605 if (info->icount.txabort)
2606 seq_printf(m, " txabort:%d", info->icount.txabort);
2607 if (info->icount.rxshort)
2608 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2609 if (info->icount.rxlong)
2610 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2611 if (info->icount.rxover)
2612 seq_printf(m, " rxover:%d", info->icount.rxover);
2613 if (info->icount.rxcrc)
2614 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2616 seq_printf(m, " ASYNC tx:%d rx:%d",
2617 info->icount.tx, info->icount.rx);
2618 if (info->icount.frame)
2619 seq_printf(m, " fe:%d", info->icount.frame);
2620 if (info->icount.parity)
2621 seq_printf(m, " pe:%d", info->icount.parity);
2622 if (info->icount.brk)
2623 seq_printf(m, " brk:%d", info->icount.brk);
2624 if (info->icount.overrun)
2625 seq_printf(m, " oe:%d", info->icount.overrun);
2628 /* Append serial signal status to end */
2629 seq_printf(m, " %s\n", stat_buf+1);
2631 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2632 info->tx_active,info->bh_requested,info->bh_running,
2636 /* Called to print information about devices
2638 static int mgslpc_proc_show(struct seq_file *m, void *v)
2642 seq_printf(m, "synclink driver:%s\n", driver_version);
2644 info = mgslpc_device_list;
2647 info = info->next_device;
2652 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2654 return single_open(file, mgslpc_proc_show, NULL);
2657 static const struct file_operations mgslpc_proc_fops = {
2658 .owner = THIS_MODULE,
2659 .open = mgslpc_proc_open,
2661 .llseek = seq_lseek,
2662 .release = single_release,
2665 static int rx_alloc_buffers(MGSLPC_INFO *info)
2667 /* each buffer has header and data */
2668 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2670 /* calculate total allocation size for 8 buffers */
2671 info->rx_buf_total_size = info->rx_buf_size * 8;
2673 /* limit total allocated memory */
2674 if (info->rx_buf_total_size > 0x10000)
2675 info->rx_buf_total_size = 0x10000;
2677 /* calculate number of buffers */
2678 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2680 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2681 if (info->rx_buf == NULL)
2684 rx_reset_buffers(info);
2688 static void rx_free_buffers(MGSLPC_INFO *info)
2690 kfree(info->rx_buf);
2691 info->rx_buf = NULL;
2694 static int claim_resources(MGSLPC_INFO *info)
2696 if (rx_alloc_buffers(info) < 0 ) {
2697 printk( "Cant allocate rx buffer %s\n", info->device_name);
2698 release_resources(info);
2704 static void release_resources(MGSLPC_INFO *info)
2706 if (debug_level >= DEBUG_LEVEL_INFO)
2707 printk("release_resources(%s)\n", info->device_name);
2708 rx_free_buffers(info);
2711 /* Add the specified device instance data structure to the
2712 * global linked list of devices and increment the device count.
2714 * Arguments: info pointer to device instance data
2716 static void mgslpc_add_device(MGSLPC_INFO *info)
2718 info->next_device = NULL;
2719 info->line = mgslpc_device_count;
2720 sprintf(info->device_name,"ttySLP%d",info->line);
2722 if (info->line < MAX_DEVICE_COUNT) {
2723 if (maxframe[info->line])
2724 info->max_frame_size = maxframe[info->line];
2727 mgslpc_device_count++;
2729 if (!mgslpc_device_list)
2730 mgslpc_device_list = info;
2732 MGSLPC_INFO *current_dev = mgslpc_device_list;
2733 while( current_dev->next_device )
2734 current_dev = current_dev->next_device;
2735 current_dev->next_device = info;
2738 if (info->max_frame_size < 4096)
2739 info->max_frame_size = 4096;
2740 else if (info->max_frame_size > 65535)
2741 info->max_frame_size = 65535;
2743 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2744 info->device_name, info->io_base, info->irq_level);
2746 #if SYNCLINK_GENERIC_HDLC
2751 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2753 MGSLPC_INFO *info = mgslpc_device_list;
2754 MGSLPC_INFO *last = NULL;
2757 if (info == remove_info) {
2759 last->next_device = info->next_device;
2761 mgslpc_device_list = info->next_device;
2762 #if SYNCLINK_GENERIC_HDLC
2765 release_resources(info);
2767 mgslpc_device_count--;
2771 info = info->next_device;
2775 static struct pcmcia_device_id mgslpc_ids[] = {
2776 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2779 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2781 static struct pcmcia_driver mgslpc_driver = {
2782 .owner = THIS_MODULE,
2784 .name = "synclink_cs",
2786 .probe = mgslpc_probe,
2787 .remove = mgslpc_detach,
2788 .id_table = mgslpc_ids,
2789 .suspend = mgslpc_suspend,
2790 .resume = mgslpc_resume,
2793 static const struct tty_operations mgslpc_ops = {
2794 .open = mgslpc_open,
2795 .close = mgslpc_close,
2796 .write = mgslpc_write,
2797 .put_char = mgslpc_put_char,
2798 .flush_chars = mgslpc_flush_chars,
2799 .write_room = mgslpc_write_room,
2800 .chars_in_buffer = mgslpc_chars_in_buffer,
2801 .flush_buffer = mgslpc_flush_buffer,
2802 .ioctl = mgslpc_ioctl,
2803 .throttle = mgslpc_throttle,
2804 .unthrottle = mgslpc_unthrottle,
2805 .send_xchar = mgslpc_send_xchar,
2806 .break_ctl = mgslpc_break,
2807 .wait_until_sent = mgslpc_wait_until_sent,
2808 .set_termios = mgslpc_set_termios,
2810 .start = tx_release,
2811 .hangup = mgslpc_hangup,
2812 .tiocmget = tiocmget,
2813 .tiocmset = tiocmset,
2814 .proc_fops = &mgslpc_proc_fops,
2817 static void synclink_cs_cleanup(void)
2821 printk("Unloading %s: version %s\n", driver_name, driver_version);
2823 while(mgslpc_device_list)
2824 mgslpc_remove_device(mgslpc_device_list);
2826 if (serial_driver) {
2827 if ((rc = tty_unregister_driver(serial_driver)))
2828 printk("%s(%d) failed to unregister tty driver err=%d\n",
2829 __FILE__,__LINE__,rc);
2830 put_tty_driver(serial_driver);
2833 pcmcia_unregister_driver(&mgslpc_driver);
2836 static int __init synclink_cs_init(void)
2840 if (break_on_load) {
2841 mgslpc_get_text_ptr();
2845 printk("%s %s\n", driver_name, driver_version);
2847 if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
2850 serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
2851 if (!serial_driver) {
2856 /* Initialize the tty_driver structure */
2858 serial_driver->owner = THIS_MODULE;
2859 serial_driver->driver_name = "synclink_cs";
2860 serial_driver->name = "ttySLP";
2861 serial_driver->major = ttymajor;
2862 serial_driver->minor_start = 64;
2863 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2864 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2865 serial_driver->init_termios = tty_std_termios;
2866 serial_driver->init_termios.c_cflag =
2867 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2868 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2869 tty_set_operations(serial_driver, &mgslpc_ops);
2871 if ((rc = tty_register_driver(serial_driver)) < 0) {
2872 printk("%s(%d):Couldn't register serial driver\n",
2874 put_tty_driver(serial_driver);
2875 serial_driver = NULL;
2879 printk("%s %s, tty major#%d\n",
2880 driver_name, driver_version,
2881 serial_driver->major);
2886 synclink_cs_cleanup();
2890 static void __exit synclink_cs_exit(void)
2892 synclink_cs_cleanup();
2895 module_init(synclink_cs_init);
2896 module_exit(synclink_cs_exit);
2898 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2903 /* note:standard BRG mode is broken in V3.2 chip
2904 * so enhanced mode is always used
2912 for (M = 1; N > 64 && M < 16; M++)
2918 * BGR[7..0] contained in BGR register
2919 * BGR[9..8] contained in CCR2[7..6]
2920 * divisor = (N+1)*2^M
2922 * Note: M *must* not be zero (causes asymetric duty cycle)
2924 write_reg(info, (unsigned char) (channel + BGR),
2925 (unsigned char) ((M << 6) + N));
2926 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2927 val |= ((M << 4) & 0xc0);
2928 write_reg(info, (unsigned char) (channel + CCR2), val);
2932 /* Enabled the AUX clock output at the specified frequency.
2934 static void enable_auxclk(MGSLPC_INFO *info)
2940 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2941 * 05 ADM Address Mode, 0 = no addr recognition
2942 * 04 TMD Timer Mode, 0 = external
2943 * 03 RAC Receiver Active, 0 = inactive
2944 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2945 * 01 TRS Timer Resolution, 1=512
2946 * 00 TLP Test Loop, 0 = no loop
2952 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2953 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2955 write_reg(info, CHB + MODE, val);
2959 * 07 PU Power Up, 1=active, 0=power down
2960 * 06 MCE Master Clock Enable, 1=enabled
2962 * 04..02 SC[2..0] Encoding
2963 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2967 write_reg(info, CHB + CCR0, 0xc0);
2971 * 07 SFLG Shared Flag, 0 = disable shared flags
2972 * 06 GALP Go Active On Loop, 0 = not used
2973 * 05 GLP Go On Loop, 0 = not used
2974 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2975 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2976 * 02..00 CM[2..0] Clock Mode
2980 write_reg(info, CHB + CCR1, 0x17);
2984 * 07..06 BGR[9..8] Baud rate bits 9..8
2985 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2986 * 04 SSEL Clock source select, 1=submode b
2987 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2988 * 02 RWX Read/Write Exchange 0=disabled
2989 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2990 * 00 DIV, data inversion 0=disabled, 1=enabled
2994 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2995 write_reg(info, CHB + CCR2, 0x38);
2997 write_reg(info, CHB + CCR2, 0x30);
3001 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3002 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3003 * 05 TST1 Test Pin, 0=normal operation
3004 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3005 * 03..02 Reserved, must be 0
3006 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3010 write_reg(info, CHB + CCR4, 0x50);
3012 /* if auxclk not enabled, set internal BRG so
3013 * CTS transitions can be detected (requires TxC)
3015 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3016 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3018 mgslpc_set_rate(info, CHB, 921600);
3021 static void loopback_enable(MGSLPC_INFO *info)
3025 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3026 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3027 write_reg(info, CHA + CCR1, val);
3029 /* CCR2:04 SSEL Clock source select, 1=submode b */
3030 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3031 write_reg(info, CHA + CCR2, val);
3033 /* set LinkSpeed if available, otherwise default to 2Mbps */
3034 if (info->params.clock_speed)
3035 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3037 mgslpc_set_rate(info, CHA, 1843200);
3039 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3040 val = read_reg(info, CHA + MODE) | BIT0;
3041 write_reg(info, CHA + MODE, val);
3044 static void hdlc_mode(MGSLPC_INFO *info)
3047 unsigned char clkmode, clksubmode;
3049 /* disable all interrupts */
3050 irq_disable(info, CHA, 0xffff);
3051 irq_disable(info, CHB, 0xffff);
3052 port_irq_disable(info, 0xff);
3054 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3055 clkmode = clksubmode = 0;
3056 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3057 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3058 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3060 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3061 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3062 /* clock mode 7b, rcv = BRG, xmt = BRG */
3065 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3066 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3067 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3071 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3074 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3075 /* clock mode 0b, rcv = RxC, xmt = BRG */
3081 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3082 * 05 ADM Address Mode, 0 = no addr recognition
3083 * 04 TMD Timer Mode, 0 = external
3084 * 03 RAC Receiver Active, 0 = inactive
3085 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3086 * 01 TRS Timer Resolution, 1=512
3087 * 00 TLP Test Loop, 0 = no loop
3092 if (info->params.loopback)
3095 /* preserve RTS state */
3096 if (info->serial_signals & SerialSignal_RTS)
3098 write_reg(info, CHA + MODE, val);
3102 * 07 PU Power Up, 1=active, 0=power down
3103 * 06 MCE Master Clock Enable, 1=enabled
3105 * 04..02 SC[2..0] Encoding
3106 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3111 switch (info->params.encoding)
3113 case HDLC_ENCODING_NRZI:
3116 case HDLC_ENCODING_BIPHASE_SPACE:
3119 case HDLC_ENCODING_BIPHASE_MARK:
3122 case HDLC_ENCODING_BIPHASE_LEVEL:
3124 break; // Manchester
3126 write_reg(info, CHA + CCR0, val);
3130 * 07 SFLG Shared Flag, 0 = disable shared flags
3131 * 06 GALP Go Active On Loop, 0 = not used
3132 * 05 GLP Go On Loop, 0 = not used
3133 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3134 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3135 * 02..00 CM[2..0] Clock Mode
3139 val = 0x10 + clkmode;
3140 write_reg(info, CHA + CCR1, val);
3144 * 07..06 BGR[9..8] Baud rate bits 9..8
3145 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3146 * 04 SSEL Clock source select, 1=submode b
3147 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3148 * 02 RWX Read/Write Exchange 0=disabled
3149 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3150 * 00 DIV, data inversion 0=disabled, 1=enabled
3155 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3156 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3160 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3162 if (info->params.encoding == HDLC_ENCODING_NRZB)
3164 write_reg(info, CHA + CCR2, val);
3168 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3169 * 05 EPT Enable preamble transmission, 1=enabled
3170 * 04 RADD Receive address pushed to FIFO, 0=disabled
3171 * 03 CRL CRC Reset Level, 0=FFFF
3172 * 02 RCRC Rx CRC 0=On 1=Off
3173 * 01 TCRC Tx CRC 0=On 1=Off
3174 * 00 PSD DPLL Phase Shift Disable
3179 if (info->params.crc_type == HDLC_CRC_NONE)
3181 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3183 switch (info->params.preamble_length)
3185 case HDLC_PREAMBLE_LENGTH_16BITS:
3188 case HDLC_PREAMBLE_LENGTH_32BITS:
3191 case HDLC_PREAMBLE_LENGTH_64BITS:
3195 write_reg(info, CHA + CCR3, val);
3197 /* PRE - Preamble pattern */
3199 switch (info->params.preamble)
3201 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3202 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3203 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3204 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3206 write_reg(info, CHA + PRE, val);
3210 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3211 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3212 * 05 TST1 Test Pin, 0=normal operation
3213 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3214 * 03..02 Reserved, must be 0
3215 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3220 write_reg(info, CHA + CCR4, val);
3221 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3222 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3224 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3226 /* RLCR Receive length check register
3228 * 7 1=enable receive length check
3229 * 6..0 Max frame length = (RL + 1) * 32
3231 write_reg(info, CHA + RLCR, 0);
3233 /* XBCH Transmit Byte Count High
3235 * 07 DMA mode, 0 = interrupt driven
3236 * 06 NRM, 0=ABM (ignored)
3237 * 05 CAS Carrier Auto Start
3238 * 04 XC Transmit Continuously (ignored)
3239 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3244 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3246 write_reg(info, CHA + XBCH, val);
3247 enable_auxclk(info);
3248 if (info->params.loopback || info->testing_irq)
3249 loopback_enable(info);
3250 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3252 irq_enable(info, CHB, IRQ_CTS);
3253 /* PVR[3] 1=AUTO CTS active */
3254 set_reg_bits(info, CHA + PVR, BIT3);
3256 clear_reg_bits(info, CHA + PVR, BIT3);
3258 irq_enable(info, CHA,
3259 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3260 IRQ_UNDERRUN + IRQ_TXFIFO);
3261 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3262 wait_command_complete(info, CHA);
3263 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3265 /* Master clock mode enabled above to allow reset commands
3266 * to complete even if no data clocks are present.
3268 * Disable master clock mode for normal communications because
3269 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3270 * IRQ when in master clock mode.
3272 * Leave master clock mode enabled for IRQ test because the
3273 * timer IRQ used by the test can only happen in master clock mode.
3275 if (!info->testing_irq)
3276 clear_reg_bits(info, CHA + CCR0, BIT6);
3284 static void rx_stop(MGSLPC_INFO *info)
3286 if (debug_level >= DEBUG_LEVEL_ISR)
3287 printk("%s(%d):rx_stop(%s)\n",
3288 __FILE__,__LINE__, info->device_name );
3290 /* MODE:03 RAC Receiver Active, 0=inactive */
3291 clear_reg_bits(info, CHA + MODE, BIT3);
3293 info->rx_enabled = false;
3294 info->rx_overflow = false;
3297 static void rx_start(MGSLPC_INFO *info)
3299 if (debug_level >= DEBUG_LEVEL_ISR)
3300 printk("%s(%d):rx_start(%s)\n",
3301 __FILE__,__LINE__, info->device_name );
3303 rx_reset_buffers(info);
3304 info->rx_enabled = false;
3305 info->rx_overflow = false;
3307 /* MODE:03 RAC Receiver Active, 1=active */
3308 set_reg_bits(info, CHA + MODE, BIT3);
3310 info->rx_enabled = true;
3313 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3315 if (debug_level >= DEBUG_LEVEL_ISR)
3316 printk("%s(%d):tx_start(%s)\n",
3317 __FILE__,__LINE__, info->device_name );
3319 if (info->tx_count) {
3320 /* If auto RTS enabled and RTS is inactive, then assert */
3321 /* RTS and set a flag indicating that the driver should */
3322 /* negate RTS when the transmission completes. */
3323 info->drop_rts_on_tx_done = false;
3325 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3327 if (!(info->serial_signals & SerialSignal_RTS)) {
3328 info->serial_signals |= SerialSignal_RTS;
3330 info->drop_rts_on_tx_done = true;
3334 if (info->params.mode == MGSL_MODE_ASYNC) {
3335 if (!info->tx_active) {
3336 info->tx_active = true;
3337 tx_ready(info, tty);
3340 info->tx_active = true;
3341 tx_ready(info, tty);
3342 mod_timer(&info->tx_timer, jiffies +
3343 msecs_to_jiffies(5000));
3347 if (!info->tx_enabled)
3348 info->tx_enabled = true;
3351 static void tx_stop(MGSLPC_INFO *info)
3353 if (debug_level >= DEBUG_LEVEL_ISR)
3354 printk("%s(%d):tx_stop(%s)\n",
3355 __FILE__,__LINE__, info->device_name );
3357 del_timer(&info->tx_timer);
3359 info->tx_enabled = false;
3360 info->tx_active = false;
3363 /* Reset the adapter to a known state and prepare it for further use.
3365 static void reset_device(MGSLPC_INFO *info)
3367 /* power up both channels (set BIT7) */
3368 write_reg(info, CHA + CCR0, 0x80);
3369 write_reg(info, CHB + CCR0, 0x80);
3370 write_reg(info, CHA + MODE, 0);
3371 write_reg(info, CHB + MODE, 0);
3373 /* disable all interrupts */
3374 irq_disable(info, CHA, 0xffff);
3375 irq_disable(info, CHB, 0xffff);
3376 port_irq_disable(info, 0xff);
3378 /* PCR Port Configuration Register
3380 * 07..04 DEC[3..0] Serial I/F select outputs
3381 * 03 output, 1=AUTO CTS control enabled
3382 * 02 RI Ring Indicator input 0=active
3383 * 01 DSR input 0=active
3384 * 00 DTR output 0=active
3388 write_reg(info, PCR, 0x06);
3390 /* PVR Port Value Register
3392 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3393 * 03 AUTO CTS output 1=enabled
3394 * 02 RI Ring Indicator input
3396 * 00 DTR output (1=inactive)
3400 // write_reg(info, PVR, PVR_DTR);
3402 /* IPC Interrupt Port Configuration
3404 * 07 VIS 1=Masked interrupts visible
3405 * 06..05 Reserved, 0
3406 * 04..03 SLA Slave address, 00 ignored
3407 * 02 CASM Cascading Mode, 1=daisy chain
3408 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3412 write_reg(info, IPC, 0x05);
3415 static void async_mode(MGSLPC_INFO *info)
3419 /* disable all interrupts */
3420 irq_disable(info, CHA, 0xffff);
3421 irq_disable(info, CHB, 0xffff);
3422 port_irq_disable(info, 0xff);
3427 * 06 FRTS RTS State, 0=active
3428 * 05 FCTS Flow Control on CTS
3429 * 04 FLON Flow Control Enable
3430 * 03 RAC Receiver Active, 0 = inactive
3431 * 02 RTS 0=Auto RTS, 1=manual RTS
3432 * 01 TRS Timer Resolution, 1=512
3433 * 00 TLP Test Loop, 0 = no loop
3438 if (info->params.loopback)
3441 /* preserve RTS state */
3442 if (!(info->serial_signals & SerialSignal_RTS))
3444 write_reg(info, CHA + MODE, val);
3448 * 07 PU Power Up, 1=active, 0=power down
3449 * 06 MCE Master Clock Enable, 1=enabled
3451 * 04..02 SC[2..0] Encoding, 000=NRZ
3452 * 01..00 SM[1..0] Serial Mode, 11=Async
3456 write_reg(info, CHA + CCR0, 0x83);
3460 * 07..05 Reserved, 0
3461 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3462 * 03 BCR Bit Clock Rate, 1=16x
3463 * 02..00 CM[2..0] Clock Mode, 111=BRG
3467 write_reg(info, CHA + CCR1, 0x1f);
3471 * 07..06 BGR[9..8] Baud rate bits 9..8
3472 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3473 * 04 SSEL Clock source select, 1=submode b
3474 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3475 * 02 RWX Read/Write Exchange 0=disabled
3477 * 00 DIV, data inversion 0=disabled, 1=enabled
3481 write_reg(info, CHA + CCR2, 0x10);
3485 * 07..01 Reserved, 0
3486 * 00 PSD DPLL Phase Shift Disable
3490 write_reg(info, CHA + CCR3, 0);
3494 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3495 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3496 * 05 TST1 Test Pin, 0=normal operation
3497 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3498 * 03..00 Reserved, must be 0
3502 write_reg(info, CHA + CCR4, 0x50);
3503 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3508 * 06 XBRK transmit break, 0=normal operation
3509 * 05 Stop bits (0=1, 1=2)
3510 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3511 * 02 PAREN Parity Enable
3512 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3516 if (info->params.data_bits != 8)
3517 val |= BIT0; /* 7 bits */
3518 if (info->params.stop_bits != 1)
3520 if (info->params.parity != ASYNC_PARITY_NONE)
3522 val |= BIT2; /* Parity enable */
3523 if (info->params.parity == ASYNC_PARITY_ODD)
3528 write_reg(info, CHA + DAFO, val);
3530 /* RFC Rx FIFO Control
3533 * 06 DPS, 1=parity bit not stored in data byte
3534 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3535 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3536 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3538 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3542 write_reg(info, CHA + RFC, 0x5c);
3544 /* RLCR Receive length check register
3546 * Max frame length = (RL + 1) * 32
3548 write_reg(info, CHA + RLCR, 0);
3550 /* XBCH Transmit Byte Count High
3552 * 07 DMA mode, 0 = interrupt driven
3553 * 06 NRM, 0=ABM (ignored)
3554 * 05 CAS Carrier Auto Start
3555 * 04 XC Transmit Continuously (ignored)
3556 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3561 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3563 write_reg(info, CHA + XBCH, val);
3564 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3565 irq_enable(info, CHA, IRQ_CTS);
3567 /* MODE:03 RAC Receiver Active, 1=active */
3568 set_reg_bits(info, CHA + MODE, BIT3);
3569 enable_auxclk(info);
3570 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3571 irq_enable(info, CHB, IRQ_CTS);
3572 /* PVR[3] 1=AUTO CTS active */
3573 set_reg_bits(info, CHA + PVR, BIT3);
3575 clear_reg_bits(info, CHA + PVR, BIT3);
3576 irq_enable(info, CHA,
3577 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3578 IRQ_ALLSENT + IRQ_TXFIFO);
3579 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3580 wait_command_complete(info, CHA);
3581 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3584 /* Set the HDLC idle mode for the transmitter.
3586 static void tx_set_idle(MGSLPC_INFO *info)
3588 /* Note: ESCC2 only supports flags and one idle modes */
3589 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3590 set_reg_bits(info, CHA + CCR1, BIT3);
3592 clear_reg_bits(info, CHA + CCR1, BIT3);
3595 /* get state of the V24 status (input) signals.
3597 static void get_signals(MGSLPC_INFO *info)
3599 unsigned char status = 0;
3601 /* preserve DTR and RTS */
3602 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3604 if (read_reg(info, CHB + VSTR) & BIT7)
3605 info->serial_signals |= SerialSignal_DCD;
3606 if (read_reg(info, CHB + STAR) & BIT1)
3607 info->serial_signals |= SerialSignal_CTS;
3609 status = read_reg(info, CHA + PVR);
3610 if (!(status & PVR_RI))
3611 info->serial_signals |= SerialSignal_RI;
3612 if (!(status & PVR_DSR))
3613 info->serial_signals |= SerialSignal_DSR;
3616 /* Set the state of DTR and RTS based on contents of
3617 * serial_signals member of device extension.
3619 static void set_signals(MGSLPC_INFO *info)
3623 val = read_reg(info, CHA + MODE);
3624 if (info->params.mode == MGSL_MODE_ASYNC) {
3625 if (info->serial_signals & SerialSignal_RTS)
3630 if (info->serial_signals & SerialSignal_RTS)
3635 write_reg(info, CHA + MODE, val);
3637 if (info->serial_signals & SerialSignal_DTR)
3638 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3640 set_reg_bits(info, CHA + PVR, PVR_DTR);
3643 static void rx_reset_buffers(MGSLPC_INFO *info)
3650 info->rx_frame_count = 0;
3651 for (i=0 ; i < info->rx_buf_count ; i++) {
3652 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3653 buf->status = buf->count = 0;
3657 /* Attempt to return a received HDLC frame
3658 * Only frames received without errors are returned.
3660 * Returns true if frame returned, otherwise false
3662 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3664 unsigned short status;
3666 unsigned int framesize = 0;
3667 unsigned long flags;
3668 bool return_frame = false;
3670 if (info->rx_frame_count == 0)
3673 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3675 status = buf->status;
3677 /* 07 VFR 1=valid frame
3678 * 06 RDO 1=data overrun
3679 * 05 CRC 1=OK, 0=error
3680 * 04 RAB 1=frame aborted
3682 if ((status & 0xf0) != 0xA0) {
3683 if (!(status & BIT7) || (status & BIT4))
3684 info->icount.rxabort++;
3685 else if (status & BIT6)
3686 info->icount.rxover++;
3687 else if (!(status & BIT5)) {
3688 info->icount.rxcrc++;
3689 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3690 return_frame = true;
3693 #if SYNCLINK_GENERIC_HDLC
3695 info->netdev->stats.rx_errors++;
3696 info->netdev->stats.rx_frame_errors++;
3700 return_frame = true;
3703 framesize = buf->count;
3705 if (debug_level >= DEBUG_LEVEL_BH)
3706 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3707 __FILE__,__LINE__,info->device_name,status,framesize);
3709 if (debug_level >= DEBUG_LEVEL_DATA)
3710 trace_block(info, buf->data, framesize, 0);
3713 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3714 framesize+1 > info->max_frame_size) ||
3715 framesize > info->max_frame_size)
3716 info->icount.rxlong++;
3719 info->icount.rxok++;
3721 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3722 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3726 #if SYNCLINK_GENERIC_HDLC
3728 hdlcdev_rx(info, buf->data, framesize);
3731 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3735 spin_lock_irqsave(&info->lock,flags);
3736 buf->status = buf->count = 0;
3737 info->rx_frame_count--;
3739 if (info->rx_get >= info->rx_buf_count)
3741 spin_unlock_irqrestore(&info->lock,flags);
3746 static bool register_test(MGSLPC_INFO *info)
3748 static unsigned char patterns[] =
3749 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3750 static unsigned int count = ARRAY_SIZE(patterns);
3753 unsigned long flags;
3755 spin_lock_irqsave(&info->lock,flags);
3758 for (i = 0; i < count; i++) {
3759 write_reg(info, XAD1, patterns[i]);
3760 write_reg(info, XAD2, patterns[(i + 1) % count]);
3761 if ((read_reg(info, XAD1) != patterns[i]) ||
3762 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3768 spin_unlock_irqrestore(&info->lock,flags);
3772 static bool irq_test(MGSLPC_INFO *info)
3774 unsigned long end_time;
3775 unsigned long flags;
3777 spin_lock_irqsave(&info->lock,flags);
3780 info->testing_irq = true;
3783 info->irq_occurred = false;
3785 /* init hdlc mode */
3787 irq_enable(info, CHA, IRQ_TIMER);
3788 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3789 issue_command(info, CHA, CMD_START_TIMER);
3791 spin_unlock_irqrestore(&info->lock,flags);
3794 while(end_time-- && !info->irq_occurred) {
3795 msleep_interruptible(10);
3798 info->testing_irq = false;
3800 spin_lock_irqsave(&info->lock,flags);
3802 spin_unlock_irqrestore(&info->lock,flags);
3804 return info->irq_occurred;
3807 static int adapter_test(MGSLPC_INFO *info)
3809 if (!register_test(info)) {
3810 info->init_error = DiagStatus_AddressFailure;
3811 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3812 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3816 if (!irq_test(info)) {
3817 info->init_error = DiagStatus_IrqFailure;
3818 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3819 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3823 if (debug_level >= DEBUG_LEVEL_INFO)
3824 printk("%s(%d):device %s passed diagnostics\n",
3825 __FILE__,__LINE__,info->device_name);
3829 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3834 printk("%s tx data:\n",info->device_name);
3836 printk("%s rx data:\n",info->device_name);
3844 for(i=0;i<linecount;i++)
3845 printk("%02X ",(unsigned char)data[i]);
3848 for(i=0;i<linecount;i++) {
3849 if (data[i]>=040 && data[i]<=0176)
3850 printk("%c",data[i]);
3861 /* HDLC frame time out
3862 * update stats and do tx completion processing
3864 static void tx_timeout(unsigned long context)
3866 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3867 unsigned long flags;
3869 if ( debug_level >= DEBUG_LEVEL_INFO )
3870 printk( "%s(%d):tx_timeout(%s)\n",
3871 __FILE__,__LINE__,info->device_name);
3872 if(info->tx_active &&
3873 info->params.mode == MGSL_MODE_HDLC) {
3874 info->icount.txtimeout++;
3876 spin_lock_irqsave(&info->lock,flags);
3877 info->tx_active = false;
3878 info->tx_count = info->tx_put = info->tx_get = 0;
3880 spin_unlock_irqrestore(&info->lock,flags);
3882 #if SYNCLINK_GENERIC_HDLC
3884 hdlcdev_tx_done(info);
3888 struct tty_struct *tty = tty_port_tty_get(&info->port);
3889 bh_transmit(info, tty);
3894 #if SYNCLINK_GENERIC_HDLC
3897 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3898 * set encoding and frame check sequence (FCS) options
3900 * dev pointer to network device structure
3901 * encoding serial encoding setting
3902 * parity FCS setting
3904 * returns 0 if success, otherwise error code
3906 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3907 unsigned short parity)
3909 MGSLPC_INFO *info = dev_to_port(dev);
3910 struct tty_struct *tty;
3911 unsigned char new_encoding;
3912 unsigned short new_crctype;
3914 /* return error if TTY interface open */
3915 if (info->port.count)
3920 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3921 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3922 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3923 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3924 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3925 default: return -EINVAL;
3930 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3931 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3932 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3933 default: return -EINVAL;
3936 info->params.encoding = new_encoding;
3937 info->params.crc_type = new_crctype;
3939 /* if network interface up, reprogram hardware */
3940 if (info->netcount) {
3941 tty = tty_port_tty_get(&info->port);
3942 mgslpc_program_hw(info, tty);
3950 * called by generic HDLC layer to send frame
3952 * skb socket buffer containing HDLC frame
3953 * dev pointer to network device structure
3955 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3956 struct net_device *dev)
3958 MGSLPC_INFO *info = dev_to_port(dev);
3959 unsigned long flags;
3961 if (debug_level >= DEBUG_LEVEL_INFO)
3962 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3964 /* stop sending until this frame completes */
3965 netif_stop_queue(dev);
3967 /* copy data to device buffers */
3968 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3970 info->tx_put = info->tx_count = skb->len;
3972 /* update network statistics */
3973 dev->stats.tx_packets++;
3974 dev->stats.tx_bytes += skb->len;
3976 /* done with socket buffer, so free it */
3979 /* save start time for transmit timeout detection */
3980 dev->trans_start = jiffies;
3982 /* start hardware transmitter if necessary */
3983 spin_lock_irqsave(&info->lock,flags);
3984 if (!info->tx_active) {
3985 struct tty_struct *tty = tty_port_tty_get(&info->port);
3986 tx_start(info, tty);
3989 spin_unlock_irqrestore(&info->lock,flags);
3991 return NETDEV_TX_OK;
3995 * called by network layer when interface enabled
3996 * claim resources and initialize hardware
3998 * dev pointer to network device structure
4000 * returns 0 if success, otherwise error code
4002 static int hdlcdev_open(struct net_device *dev)
4004 MGSLPC_INFO *info = dev_to_port(dev);
4005 struct tty_struct *tty;
4007 unsigned long flags;
4009 if (debug_level >= DEBUG_LEVEL_INFO)
4010 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4012 /* generic HDLC layer open processing */
4013 if ((rc = hdlc_open(dev)))
4016 /* arbitrate between network and tty opens */
4017 spin_lock_irqsave(&info->netlock, flags);
4018 if (info->port.count != 0 || info->netcount != 0) {
4019 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4020 spin_unlock_irqrestore(&info->netlock, flags);
4024 spin_unlock_irqrestore(&info->netlock, flags);
4026 tty = tty_port_tty_get(&info->port);
4027 /* claim resources and init adapter */
4028 if ((rc = startup(info, tty)) != 0) {
4030 spin_lock_irqsave(&info->netlock, flags);
4032 spin_unlock_irqrestore(&info->netlock, flags);
4035 /* assert DTR and RTS, apply hardware settings */
4036 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4037 mgslpc_program_hw(info, tty);
4040 /* enable network layer transmit */
4041 dev->trans_start = jiffies;
4042 netif_start_queue(dev);
4044 /* inform generic HDLC layer of current DCD status */
4045 spin_lock_irqsave(&info->lock, flags);
4047 spin_unlock_irqrestore(&info->lock, flags);
4048 if (info->serial_signals & SerialSignal_DCD)
4049 netif_carrier_on(dev);
4051 netif_carrier_off(dev);
4056 * called by network layer when interface is disabled
4057 * shutdown hardware and release resources
4059 * dev pointer to network device structure
4061 * returns 0 if success, otherwise error code
4063 static int hdlcdev_close(struct net_device *dev)
4065 MGSLPC_INFO *info = dev_to_port(dev);
4066 struct tty_struct *tty = tty_port_tty_get(&info->port);
4067 unsigned long flags;
4069 if (debug_level >= DEBUG_LEVEL_INFO)
4070 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4072 netif_stop_queue(dev);
4074 /* shutdown adapter and release resources */
4075 shutdown(info, tty);
4079 spin_lock_irqsave(&info->netlock, flags);
4081 spin_unlock_irqrestore(&info->netlock, flags);
4087 * called by network layer to process IOCTL call to network device
4089 * dev pointer to network device structure
4090 * ifr pointer to network interface request structure
4091 * cmd IOCTL command code
4093 * returns 0 if success, otherwise error code
4095 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4097 const size_t size = sizeof(sync_serial_settings);
4098 sync_serial_settings new_line;
4099 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4100 MGSLPC_INFO *info = dev_to_port(dev);
4103 if (debug_level >= DEBUG_LEVEL_INFO)
4104 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4106 /* return error if TTY interface open */
4107 if (info->port.count)
4110 if (cmd != SIOCWANDEV)
4111 return hdlc_ioctl(dev, ifr, cmd);
4113 switch(ifr->ifr_settings.type) {
4114 case IF_GET_IFACE: /* return current sync_serial_settings */
4116 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4117 if (ifr->ifr_settings.size < size) {
4118 ifr->ifr_settings.size = size; /* data size wanted */
4122 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4123 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4124 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4125 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4128 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4129 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4130 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4131 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4132 default: new_line.clock_type = CLOCK_DEFAULT;
4135 new_line.clock_rate = info->params.clock_speed;
4136 new_line.loopback = info->params.loopback ? 1:0;
4138 if (copy_to_user(line, &new_line, size))
4142 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4144 if(!capable(CAP_NET_ADMIN))
4146 if (copy_from_user(&new_line, line, size))
4149 switch (new_line.clock_type)
4151 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4152 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4153 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4154 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4155 case CLOCK_DEFAULT: flags = info->params.flags &
4156 (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); break;
4160 default: return -EINVAL;
4163 if (new_line.loopback != 0 && new_line.loopback != 1)
4166 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4167 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4168 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4169 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4170 info->params.flags |= flags;
4172 info->params.loopback = new_line.loopback;
4174 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4175 info->params.clock_speed = new_line.clock_rate;
4177 info->params.clock_speed = 0;
4179 /* if network interface up, reprogram hardware */
4180 if (info->netcount) {
4181 struct tty_struct *tty = tty_port_tty_get(&info->port);
4182 mgslpc_program_hw(info, tty);
4188 return hdlc_ioctl(dev, ifr, cmd);
4193 * called by network layer when transmit timeout is detected
4195 * dev pointer to network device structure
4197 static void hdlcdev_tx_timeout(struct net_device *dev)
4199 MGSLPC_INFO *info = dev_to_port(dev);
4200 unsigned long flags;
4202 if (debug_level >= DEBUG_LEVEL_INFO)
4203 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4205 dev->stats.tx_errors++;
4206 dev->stats.tx_aborted_errors++;
4208 spin_lock_irqsave(&info->lock,flags);
4210 spin_unlock_irqrestore(&info->lock,flags);
4212 netif_wake_queue(dev);
4216 * called by device driver when transmit completes
4217 * reenable network layer transmit if stopped
4219 * info pointer to device instance information
4221 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4223 if (netif_queue_stopped(info->netdev))
4224 netif_wake_queue(info->netdev);
4228 * called by device driver when frame received
4229 * pass frame to network layer
4231 * info pointer to device instance information
4232 * buf pointer to buffer contianing frame data
4233 * size count of data bytes in buf
4235 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4237 struct sk_buff *skb = dev_alloc_skb(size);
4238 struct net_device *dev = info->netdev;
4240 if (debug_level >= DEBUG_LEVEL_INFO)
4241 printk("hdlcdev_rx(%s)\n",dev->name);
4244 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4245 dev->stats.rx_dropped++;
4249 memcpy(skb_put(skb, size), buf, size);
4251 skb->protocol = hdlc_type_trans(skb, dev);
4253 dev->stats.rx_packets++;
4254 dev->stats.rx_bytes += size;
4259 static const struct net_device_ops hdlcdev_ops = {
4260 .ndo_open = hdlcdev_open,
4261 .ndo_stop = hdlcdev_close,
4262 .ndo_change_mtu = hdlc_change_mtu,
4263 .ndo_start_xmit = hdlc_start_xmit,
4264 .ndo_do_ioctl = hdlcdev_ioctl,
4265 .ndo_tx_timeout = hdlcdev_tx_timeout,
4269 * called by device driver when adding device instance
4270 * do generic HDLC initialization
4272 * info pointer to device instance information
4274 * returns 0 if success, otherwise error code
4276 static int hdlcdev_init(MGSLPC_INFO *info)
4279 struct net_device *dev;
4282 /* allocate and initialize network and HDLC layer objects */
4284 if (!(dev = alloc_hdlcdev(info))) {
4285 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4289 /* for network layer reporting purposes only */
4290 dev->base_addr = info->io_base;
4291 dev->irq = info->irq_level;
4293 /* network layer callbacks and settings */
4294 dev->netdev_ops = &hdlcdev_ops;
4295 dev->watchdog_timeo = 10 * HZ;
4296 dev->tx_queue_len = 50;
4298 /* generic HDLC layer callbacks and settings */
4299 hdlc = dev_to_hdlc(dev);
4300 hdlc->attach = hdlcdev_attach;
4301 hdlc->xmit = hdlcdev_xmit;
4303 /* register objects with HDLC layer */
4304 if ((rc = register_hdlc_device(dev))) {
4305 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4315 * called by device driver when removing device instance
4316 * do generic HDLC cleanup
4318 * info pointer to device instance information
4320 static void hdlcdev_exit(MGSLPC_INFO *info)
4322 unregister_hdlc_device(info->netdev);
4323 free_netdev(info->netdev);
4324 info->netdev = NULL;
4327 #endif /* CONFIG_HDLC */