2 * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
4 * Device driver for Microgate SyncLink GT serial adapters.
6 * written by Paul Fulghum for Microgate Corporation
9 * Microgate and SyncLink are trademarks of Microgate Corporation
11 * This code is released under the GNU General Public License (GPL)
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 * DEBUG OUTPUT DEFINITIONS
29 * uncomment lines below to enable specific types of debug output
31 * DBGINFO information - most verbose output
32 * DBGERR serious errors
33 * DBGBH bottom half service routine debugging
34 * DBGISR interrupt service routine debugging
35 * DBGDATA output receive and transmit data
36 * DBGTBUF output transmit DMA buffers and registers
37 * DBGRBUF output receive DMA buffers and registers
40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45 //#define DBGTBUF(info) dump_tbufs(info)
46 //#define DBGRBUF(info) dump_rbufs(info)
49 #include <linux/module.h>
50 #include <linux/errno.h>
51 #include <linux/signal.h>
52 #include <linux/sched.h>
53 #include <linux/timer.h>
54 #include <linux/interrupt.h>
55 #include <linux/pci.h>
56 #include <linux/tty.h>
57 #include <linux/tty_flip.h>
58 #include <linux/serial.h>
59 #include <linux/major.h>
60 #include <linux/string.h>
61 #include <linux/fcntl.h>
62 #include <linux/ptrace.h>
63 #include <linux/ioport.h>
65 #include <linux/slab.h>
66 #include <linux/netdevice.h>
67 #include <linux/vmalloc.h>
68 #include <linux/init.h>
69 #include <linux/delay.h>
70 #include <linux/ioctl.h>
71 #include <linux/termios.h>
72 #include <linux/bitops.h>
73 #include <linux/workqueue.h>
74 #include <linux/hdlc.h>
75 #include <linux/synclink.h>
77 #include <asm/system.h>
81 #include <asm/types.h>
82 #include <asm/uaccess.h>
84 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
85 #define SYNCLINK_GENERIC_HDLC 1
87 #define SYNCLINK_GENERIC_HDLC 0
91 * module identification
93 static char *driver_name = "SyncLink GT";
94 static char *driver_version = "$Revision: 4.50 $";
95 static char *tty_driver_name = "synclink_gt";
96 static char *tty_dev_prefix = "ttySLG";
97 MODULE_LICENSE("GPL");
98 #define MGSL_MAGIC 0x5401
99 #define MAX_DEVICES 32
101 static struct pci_device_id pci_table[] = {
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106 {0,}, /* terminate list */
108 MODULE_DEVICE_TABLE(pci, pci_table);
110 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
111 static void remove_one(struct pci_dev *dev);
112 static struct pci_driver pci_driver = {
113 .name = "synclink_gt",
114 .id_table = pci_table,
116 .remove = __devexit_p(remove_one),
119 static bool pci_registered;
122 * module configuration and status
124 static struct slgt_info *slgt_device_list;
125 static int slgt_device_count;
128 static int debug_level;
129 static int maxframe[MAX_DEVICES];
131 module_param(ttymajor, int, 0);
132 module_param(debug_level, int, 0);
133 module_param_array(maxframe, int, NULL, 0);
135 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
136 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
137 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
140 * tty support and callbacks
142 static struct tty_driver *serial_driver;
144 static int open(struct tty_struct *tty, struct file * filp);
145 static void close(struct tty_struct *tty, struct file * filp);
146 static void hangup(struct tty_struct *tty);
147 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
149 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
150 static int put_char(struct tty_struct *tty, unsigned char ch);
151 static void send_xchar(struct tty_struct *tty, char ch);
152 static void wait_until_sent(struct tty_struct *tty, int timeout);
153 static int write_room(struct tty_struct *tty);
154 static void flush_chars(struct tty_struct *tty);
155 static void flush_buffer(struct tty_struct *tty);
156 static void tx_hold(struct tty_struct *tty);
157 static void tx_release(struct tty_struct *tty);
159 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
160 static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
161 static int chars_in_buffer(struct tty_struct *tty);
162 static void throttle(struct tty_struct * tty);
163 static void unthrottle(struct tty_struct * tty);
164 static int set_break(struct tty_struct *tty, int break_state);
167 * generic HDLC support and callbacks
169 #if SYNCLINK_GENERIC_HDLC
170 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
171 static void hdlcdev_tx_done(struct slgt_info *info);
172 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
173 static int hdlcdev_init(struct slgt_info *info);
174 static void hdlcdev_exit(struct slgt_info *info);
179 * device specific structures, macros and functions
182 #define SLGT_MAX_PORTS 4
183 #define SLGT_REG_SIZE 256
186 * conditional wait facility
189 struct cond_wait *next;
194 static void init_cond_wait(struct cond_wait *w, unsigned int data);
195 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
196 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
197 static void flush_cond_wait(struct cond_wait **head);
200 * DMA buffer descriptor and access macros
206 __le32 pbuf; /* physical address of data buffer */
207 __le32 next; /* physical address of next descriptor */
209 /* driver book keeping */
210 char *buf; /* virtual address of data buffer */
211 unsigned int pdesc; /* physical address of this descriptor */
212 dma_addr_t buf_dma_addr;
213 unsigned short buf_count;
216 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
217 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
218 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
219 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
220 #define desc_count(a) (le16_to_cpu((a).count))
221 #define desc_status(a) (le16_to_cpu((a).status))
222 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
223 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
224 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
225 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
226 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
228 struct _input_signal_events {
240 * device instance data structure
243 void *if_ptr; /* General purpose pointer (used by SPPP) */
244 struct tty_port port;
246 struct slgt_info *next_device; /* device list link */
250 char device_name[25];
251 struct pci_dev *pdev;
253 int port_count; /* count of ports on adapter */
254 int adapter_num; /* adapter instance number */
255 int port_num; /* port instance number */
257 /* array of pointers to port contexts on this adapter */
258 struct slgt_info *port_array[SLGT_MAX_PORTS];
260 int line; /* tty line instance number */
262 struct mgsl_icount icount;
265 int x_char; /* xon/xoff character */
266 unsigned int read_status_mask;
267 unsigned int ignore_status_mask;
269 wait_queue_head_t status_event_wait_q;
270 wait_queue_head_t event_wait_q;
271 struct timer_list tx_timer;
272 struct timer_list rx_timer;
274 unsigned int gpio_present;
275 struct cond_wait *gpio_wait_q;
277 spinlock_t lock; /* spinlock for synchronizing with ISR */
279 struct work_struct task;
285 bool irq_requested; /* true if IRQ requested */
286 bool irq_occurred; /* for diagnostics use */
288 /* device configuration */
290 unsigned int bus_type;
291 unsigned int irq_level;
292 unsigned long irq_flags;
294 unsigned char __iomem * reg_addr; /* memory mapped registers address */
296 bool reg_addr_requested;
298 MGSL_PARAMS params; /* communications parameters */
300 u32 max_frame_size; /* as set by device config */
302 unsigned int rbuf_fill_level;
303 unsigned int if_mode;
313 unsigned char signals; /* serial signal states */
314 int init_error; /* initialization error */
316 unsigned char *tx_buf;
319 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
320 char char_buf[MAX_ASYNC_BUFFER_SIZE];
321 bool drop_rts_on_tx_done;
322 struct _input_signal_events input_signal_events;
324 int dcd_chkcount; /* check counts to prevent */
325 int cts_chkcount; /* too many IRQs if a signal */
326 int dsr_chkcount; /* is floating */
329 char *bufs; /* virtual address of DMA buffer lists */
330 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
332 unsigned int rbuf_count;
333 struct slgt_desc *rbufs;
334 unsigned int rbuf_current;
335 unsigned int rbuf_index;
337 unsigned int tbuf_count;
338 struct slgt_desc *tbufs;
339 unsigned int tbuf_current;
340 unsigned int tbuf_start;
342 unsigned char *tmp_rbuf;
343 unsigned int tmp_rbuf_count;
345 /* SPPP/Cisco HDLC device parts */
349 #if SYNCLINK_GENERIC_HDLC
350 struct net_device *netdev;
355 static MGSL_PARAMS default_params = {
356 .mode = MGSL_MODE_HDLC,
358 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
359 .encoding = HDLC_ENCODING_NRZI_SPACE,
362 .crc_type = HDLC_CRC_16_CCITT,
363 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
364 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
368 .parity = ASYNC_PARITY_NONE
373 #define BH_TRANSMIT 2
375 #define IO_PIN_SHUTDOWN_LIMIT 100
377 #define DMABUFSIZE 256
378 #define DESC_LIST_SIZE 4096
380 #define MASK_PARITY BIT1
381 #define MASK_FRAMING BIT0
382 #define MASK_BREAK BIT14
383 #define MASK_OVERRUN BIT4
385 #define GSR 0x00 /* global status */
386 #define JCR 0x04 /* JTAG control */
387 #define IODR 0x08 /* GPIO direction */
388 #define IOER 0x0c /* GPIO interrupt enable */
389 #define IOVR 0x10 /* GPIO value */
390 #define IOSR 0x14 /* GPIO interrupt status */
391 #define TDR 0x80 /* tx data */
392 #define RDR 0x80 /* rx data */
393 #define TCR 0x82 /* tx control */
394 #define TIR 0x84 /* tx idle */
395 #define TPR 0x85 /* tx preamble */
396 #define RCR 0x86 /* rx control */
397 #define VCR 0x88 /* V.24 control */
398 #define CCR 0x89 /* clock control */
399 #define BDR 0x8a /* baud divisor */
400 #define SCR 0x8c /* serial control */
401 #define SSR 0x8e /* serial status */
402 #define RDCSR 0x90 /* rx DMA control/status */
403 #define TDCSR 0x94 /* tx DMA control/status */
404 #define RDDAR 0x98 /* rx DMA descriptor address */
405 #define TDDAR 0x9c /* tx DMA descriptor address */
408 #define RXBREAK BIT14
409 #define IRQ_TXDATA BIT13
410 #define IRQ_TXIDLE BIT12
411 #define IRQ_TXUNDER BIT11 /* HDLC */
412 #define IRQ_RXDATA BIT10
413 #define IRQ_RXIDLE BIT9 /* HDLC */
414 #define IRQ_RXBREAK BIT9 /* async */
415 #define IRQ_RXOVER BIT8
420 #define IRQ_ALL 0x3ff0
421 #define IRQ_MASTER BIT0
423 #define slgt_irq_on(info, mask) \
424 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
425 #define slgt_irq_off(info, mask) \
426 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
428 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
429 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
430 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
431 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
432 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
433 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
435 static void msc_set_vcr(struct slgt_info *info);
437 static int startup(struct slgt_info *info);
438 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
439 static void shutdown(struct slgt_info *info);
440 static void program_hw(struct slgt_info *info);
441 static void change_params(struct slgt_info *info);
443 static int register_test(struct slgt_info *info);
444 static int irq_test(struct slgt_info *info);
445 static int loopback_test(struct slgt_info *info);
446 static int adapter_test(struct slgt_info *info);
448 static void reset_adapter(struct slgt_info *info);
449 static void reset_port(struct slgt_info *info);
450 static void async_mode(struct slgt_info *info);
451 static void sync_mode(struct slgt_info *info);
453 static void rx_stop(struct slgt_info *info);
454 static void rx_start(struct slgt_info *info);
455 static void reset_rbufs(struct slgt_info *info);
456 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
457 static void rdma_reset(struct slgt_info *info);
458 static bool rx_get_frame(struct slgt_info *info);
459 static bool rx_get_buf(struct slgt_info *info);
461 static void tx_start(struct slgt_info *info);
462 static void tx_stop(struct slgt_info *info);
463 static void tx_set_idle(struct slgt_info *info);
464 static unsigned int free_tbuf_count(struct slgt_info *info);
465 static unsigned int tbuf_bytes(struct slgt_info *info);
466 static void reset_tbufs(struct slgt_info *info);
467 static void tdma_reset(struct slgt_info *info);
468 static void tdma_start(struct slgt_info *info);
469 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
471 static void get_signals(struct slgt_info *info);
472 static void set_signals(struct slgt_info *info);
473 static void enable_loopback(struct slgt_info *info);
474 static void set_rate(struct slgt_info *info, u32 data_rate);
476 static int bh_action(struct slgt_info *info);
477 static void bh_handler(struct work_struct *work);
478 static void bh_transmit(struct slgt_info *info);
479 static void isr_serial(struct slgt_info *info);
480 static void isr_rdma(struct slgt_info *info);
481 static void isr_txeom(struct slgt_info *info, unsigned short status);
482 static void isr_tdma(struct slgt_info *info);
484 static int alloc_dma_bufs(struct slgt_info *info);
485 static void free_dma_bufs(struct slgt_info *info);
486 static int alloc_desc(struct slgt_info *info);
487 static void free_desc(struct slgt_info *info);
488 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
489 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491 static int alloc_tmp_rbuf(struct slgt_info *info);
492 static void free_tmp_rbuf(struct slgt_info *info);
494 static void tx_timeout(unsigned long context);
495 static void rx_timeout(unsigned long context);
500 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
501 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
502 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
503 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
504 static int set_txidle(struct slgt_info *info, int idle_mode);
505 static int tx_enable(struct slgt_info *info, int enable);
506 static int tx_abort(struct slgt_info *info);
507 static int rx_enable(struct slgt_info *info, int enable);
508 static int modem_input_wait(struct slgt_info *info,int arg);
509 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
510 static int tiocmget(struct tty_struct *tty, struct file *file);
511 static int tiocmset(struct tty_struct *tty, struct file *file,
512 unsigned int set, unsigned int clear);
513 static int set_break(struct tty_struct *tty, int break_state);
514 static int get_interface(struct slgt_info *info, int __user *if_mode);
515 static int set_interface(struct slgt_info *info, int if_mode);
516 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
517 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
518 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
523 static void add_device(struct slgt_info *info);
524 static void device_init(int adapter_num, struct pci_dev *pdev);
525 static int claim_resources(struct slgt_info *info);
526 static void release_resources(struct slgt_info *info);
545 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
549 printk("%s %s data:\n",info->device_name, label);
551 linecount = (count > 16) ? 16 : count;
552 for(i=0; i < linecount; i++)
553 printk("%02X ",(unsigned char)data[i]);
556 for(i=0;i<linecount;i++) {
557 if (data[i]>=040 && data[i]<=0176)
558 printk("%c",data[i]);
568 #define DBGDATA(info, buf, size, label)
572 static void dump_tbufs(struct slgt_info *info)
575 printk("tbuf_current=%d\n", info->tbuf_current);
576 for (i=0 ; i < info->tbuf_count ; i++) {
577 printk("%d: count=%04X status=%04X\n",
578 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
582 #define DBGTBUF(info)
586 static void dump_rbufs(struct slgt_info *info)
589 printk("rbuf_current=%d\n", info->rbuf_current);
590 for (i=0 ; i < info->rbuf_count ; i++) {
591 printk("%d: count=%04X status=%04X\n",
592 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
596 #define DBGRBUF(info)
599 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
603 printk("null struct slgt_info for (%s) in %s\n", devname, name);
606 if (info->magic != MGSL_MAGIC) {
607 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
618 * line discipline callback wrappers
620 * The wrappers maintain line discipline references
621 * while calling into the line discipline.
623 * ldisc_receive_buf - pass receive data to line discipline
625 static void ldisc_receive_buf(struct tty_struct *tty,
626 const __u8 *data, char *flags, int count)
628 struct tty_ldisc *ld;
631 ld = tty_ldisc_ref(tty);
633 if (ld->ops->receive_buf)
634 ld->ops->receive_buf(tty, data, flags, count);
641 static int open(struct tty_struct *tty, struct file *filp)
643 struct slgt_info *info;
648 if ((line < 0) || (line >= slgt_device_count)) {
649 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
653 info = slgt_device_list;
654 while(info && info->line != line)
655 info = info->next_device;
656 if (sanity_check(info, tty->name, "open"))
658 if (info->init_error) {
659 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
663 tty->driver_data = info;
664 info->port.tty = tty;
666 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
668 /* If port is closing, signal caller to try again */
669 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
670 if (info->port.flags & ASYNC_CLOSING)
671 interruptible_sleep_on(&info->port.close_wait);
672 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
673 -EAGAIN : -ERESTARTSYS);
677 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
679 spin_lock_irqsave(&info->netlock, flags);
680 if (info->netcount) {
682 spin_unlock_irqrestore(&info->netlock, flags);
686 spin_unlock_irqrestore(&info->netlock, flags);
688 if (info->port.count == 1) {
689 /* 1st open on this device, init hardware */
690 retval = startup(info);
695 retval = block_til_ready(tty, filp, info);
697 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
706 info->port.tty = NULL; /* tty layer will release tty struct */
711 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
715 static void close(struct tty_struct *tty, struct file *filp)
717 struct slgt_info *info = tty->driver_data;
719 if (sanity_check(info, tty->name, "close"))
721 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
723 if (!info->port.count)
726 if (tty_hung_up_p(filp))
729 if ((tty->count == 1) && (info->port.count != 1)) {
731 * tty->count is 1 and the tty structure will be freed.
732 * info->port.count should be one in this case.
733 * if it's not, correct it so that the port is shutdown.
735 DBGERR(("%s close: bad refcount; tty->count=1, "
736 "info->port.count=%d\n", info->device_name, info->port.count));
737 info->port.count = 1;
742 /* if at least one open remaining, leave hardware active */
743 if (info->port.count)
746 info->port.flags |= ASYNC_CLOSING;
748 /* set tty->closing to notify line discipline to
749 * only process XON/XOFF characters. Only the N_TTY
750 * discipline appears to use this (ppp does not).
754 /* wait for transmit data to clear all layers */
756 if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
757 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
758 tty_wait_until_sent(tty, info->port.closing_wait);
761 if (info->port.flags & ASYNC_INITIALIZED)
762 wait_until_sent(tty, info->timeout);
764 tty_ldisc_flush(tty);
769 info->port.tty = NULL;
771 if (info->port.blocked_open) {
772 if (info->port.close_delay) {
773 msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
775 wake_up_interruptible(&info->port.open_wait);
778 info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
780 wake_up_interruptible(&info->port.close_wait);
783 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
786 static void hangup(struct tty_struct *tty)
788 struct slgt_info *info = tty->driver_data;
790 if (sanity_check(info, tty->name, "hangup"))
792 DBGINFO(("%s hangup\n", info->device_name));
797 info->port.count = 0;
798 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
799 info->port.tty = NULL;
801 wake_up_interruptible(&info->port.open_wait);
804 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
806 struct slgt_info *info = tty->driver_data;
809 DBGINFO(("%s set_termios\n", tty->driver->name));
813 /* Handle transition to B0 status */
814 if (old_termios->c_cflag & CBAUD &&
815 !(tty->termios->c_cflag & CBAUD)) {
816 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
817 spin_lock_irqsave(&info->lock,flags);
819 spin_unlock_irqrestore(&info->lock,flags);
822 /* Handle transition away from B0 status */
823 if (!(old_termios->c_cflag & CBAUD) &&
824 tty->termios->c_cflag & CBAUD) {
825 info->signals |= SerialSignal_DTR;
826 if (!(tty->termios->c_cflag & CRTSCTS) ||
827 !test_bit(TTY_THROTTLED, &tty->flags)) {
828 info->signals |= SerialSignal_RTS;
830 spin_lock_irqsave(&info->lock,flags);
832 spin_unlock_irqrestore(&info->lock,flags);
835 /* Handle turning off CRTSCTS */
836 if (old_termios->c_cflag & CRTSCTS &&
837 !(tty->termios->c_cflag & CRTSCTS)) {
843 static int write(struct tty_struct *tty,
844 const unsigned char *buf, int count)
847 struct slgt_info *info = tty->driver_data;
849 unsigned int bufs_needed;
851 if (sanity_check(info, tty->name, "write"))
853 DBGINFO(("%s write count=%d\n", info->device_name, count));
858 if (count > info->max_frame_size) {
866 if (!info->tx_active && info->tx_count) {
867 /* send accumulated data from send_char() */
868 tx_load(info, info->tx_buf, info->tx_count);
871 bufs_needed = (count/DMABUFSIZE);
872 if (count % DMABUFSIZE)
874 if (bufs_needed > free_tbuf_count(info))
877 ret = info->tx_count = count;
878 tx_load(info, buf, count);
882 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
883 spin_lock_irqsave(&info->lock,flags);
884 if (!info->tx_active)
888 spin_unlock_irqrestore(&info->lock,flags);
892 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
896 static int put_char(struct tty_struct *tty, unsigned char ch)
898 struct slgt_info *info = tty->driver_data;
902 if (sanity_check(info, tty->name, "put_char"))
904 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
907 spin_lock_irqsave(&info->lock,flags);
908 if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
909 info->tx_buf[info->tx_count++] = ch;
912 spin_unlock_irqrestore(&info->lock,flags);
916 static void send_xchar(struct tty_struct *tty, char ch)
918 struct slgt_info *info = tty->driver_data;
921 if (sanity_check(info, tty->name, "send_xchar"))
923 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
926 spin_lock_irqsave(&info->lock,flags);
927 if (!info->tx_enabled)
929 spin_unlock_irqrestore(&info->lock,flags);
933 static void wait_until_sent(struct tty_struct *tty, int timeout)
935 struct slgt_info *info = tty->driver_data;
936 unsigned long orig_jiffies, char_time;
940 if (sanity_check(info, tty->name, "wait_until_sent"))
942 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
943 if (!(info->port.flags & ASYNC_INITIALIZED))
946 orig_jiffies = jiffies;
948 /* Set check interval to 1/5 of estimated time to
949 * send a character, and make it at least 1. The check
950 * interval should also be less than the timeout.
951 * Note: use tight timings here to satisfy the NIST-PCTS.
956 if (info->params.data_rate) {
957 char_time = info->timeout/(32 * 5);
964 char_time = min_t(unsigned long, char_time, timeout);
966 while (info->tx_active) {
967 msleep_interruptible(jiffies_to_msecs(char_time));
968 if (signal_pending(current))
970 if (timeout && time_after(jiffies, orig_jiffies + timeout))
976 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
979 static int write_room(struct tty_struct *tty)
981 struct slgt_info *info = tty->driver_data;
984 if (sanity_check(info, tty->name, "write_room"))
986 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
987 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
991 static void flush_chars(struct tty_struct *tty)
993 struct slgt_info *info = tty->driver_data;
996 if (sanity_check(info, tty->name, "flush_chars"))
998 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1000 if (info->tx_count <= 0 || tty->stopped ||
1001 tty->hw_stopped || !info->tx_buf)
1004 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1006 spin_lock_irqsave(&info->lock,flags);
1007 if (!info->tx_active && info->tx_count) {
1008 tx_load(info, info->tx_buf,info->tx_count);
1011 spin_unlock_irqrestore(&info->lock,flags);
1014 static void flush_buffer(struct tty_struct *tty)
1016 struct slgt_info *info = tty->driver_data;
1017 unsigned long flags;
1019 if (sanity_check(info, tty->name, "flush_buffer"))
1021 DBGINFO(("%s flush_buffer\n", info->device_name));
1023 spin_lock_irqsave(&info->lock,flags);
1024 if (!info->tx_active)
1026 spin_unlock_irqrestore(&info->lock,flags);
1032 * throttle (stop) transmitter
1034 static void tx_hold(struct tty_struct *tty)
1036 struct slgt_info *info = tty->driver_data;
1037 unsigned long flags;
1039 if (sanity_check(info, tty->name, "tx_hold"))
1041 DBGINFO(("%s tx_hold\n", info->device_name));
1042 spin_lock_irqsave(&info->lock,flags);
1043 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1045 spin_unlock_irqrestore(&info->lock,flags);
1049 * release (start) transmitter
1051 static void tx_release(struct tty_struct *tty)
1053 struct slgt_info *info = tty->driver_data;
1054 unsigned long flags;
1056 if (sanity_check(info, tty->name, "tx_release"))
1058 DBGINFO(("%s tx_release\n", info->device_name));
1059 spin_lock_irqsave(&info->lock,flags);
1060 if (!info->tx_active && info->tx_count) {
1061 tx_load(info, info->tx_buf, info->tx_count);
1064 spin_unlock_irqrestore(&info->lock,flags);
1068 * Service an IOCTL request
1072 * tty pointer to tty instance data
1073 * file pointer to associated file object for device
1074 * cmd IOCTL command code
1075 * arg command argument/context
1077 * Return 0 if success, otherwise error code
1079 static int ioctl(struct tty_struct *tty, struct file *file,
1080 unsigned int cmd, unsigned long arg)
1082 struct slgt_info *info = tty->driver_data;
1083 struct mgsl_icount cnow; /* kernel counter temps */
1084 struct serial_icounter_struct __user *p_cuser; /* user space */
1085 unsigned long flags;
1086 void __user *argp = (void __user *)arg;
1089 if (sanity_check(info, tty->name, "ioctl"))
1091 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1093 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1094 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1095 if (tty->flags & (1 << TTY_IO_ERROR))
1102 case MGSL_IOCGPARAMS:
1103 ret = get_params(info, argp);
1105 case MGSL_IOCSPARAMS:
1106 ret = set_params(info, argp);
1108 case MGSL_IOCGTXIDLE:
1109 ret = get_txidle(info, argp);
1111 case MGSL_IOCSTXIDLE:
1112 ret = set_txidle(info, (int)arg);
1114 case MGSL_IOCTXENABLE:
1115 ret = tx_enable(info, (int)arg);
1117 case MGSL_IOCRXENABLE:
1118 ret = rx_enable(info, (int)arg);
1120 case MGSL_IOCTXABORT:
1121 ret = tx_abort(info);
1123 case MGSL_IOCGSTATS:
1124 ret = get_stats(info, argp);
1126 case MGSL_IOCWAITEVENT:
1127 ret = wait_mgsl_event(info, argp);
1130 ret = modem_input_wait(info,(int)arg);
1133 ret = get_interface(info, argp);
1136 ret = set_interface(info,(int)arg);
1139 ret = set_gpio(info, argp);
1142 ret = get_gpio(info, argp);
1144 case MGSL_IOCWAITGPIO:
1145 ret = wait_gpio(info, argp);
1148 spin_lock_irqsave(&info->lock,flags);
1149 cnow = info->icount;
1150 spin_unlock_irqrestore(&info->lock,flags);
1152 if (put_user(cnow.cts, &p_cuser->cts) ||
1153 put_user(cnow.dsr, &p_cuser->dsr) ||
1154 put_user(cnow.rng, &p_cuser->rng) ||
1155 put_user(cnow.dcd, &p_cuser->dcd) ||
1156 put_user(cnow.rx, &p_cuser->rx) ||
1157 put_user(cnow.tx, &p_cuser->tx) ||
1158 put_user(cnow.frame, &p_cuser->frame) ||
1159 put_user(cnow.overrun, &p_cuser->overrun) ||
1160 put_user(cnow.parity, &p_cuser->parity) ||
1161 put_user(cnow.brk, &p_cuser->brk) ||
1162 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1174 * support for 32 bit ioctl calls on 64 bit systems
1176 #ifdef CONFIG_COMPAT
1177 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1179 struct MGSL_PARAMS32 tmp_params;
1181 DBGINFO(("%s get_params32\n", info->device_name));
1182 tmp_params.mode = (compat_ulong_t)info->params.mode;
1183 tmp_params.loopback = info->params.loopback;
1184 tmp_params.flags = info->params.flags;
1185 tmp_params.encoding = info->params.encoding;
1186 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1187 tmp_params.addr_filter = info->params.addr_filter;
1188 tmp_params.crc_type = info->params.crc_type;
1189 tmp_params.preamble_length = info->params.preamble_length;
1190 tmp_params.preamble = info->params.preamble;
1191 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1192 tmp_params.data_bits = info->params.data_bits;
1193 tmp_params.stop_bits = info->params.stop_bits;
1194 tmp_params.parity = info->params.parity;
1195 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1200 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1202 struct MGSL_PARAMS32 tmp_params;
1204 DBGINFO(("%s set_params32\n", info->device_name));
1205 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1208 spin_lock(&info->lock);
1209 info->params.mode = tmp_params.mode;
1210 info->params.loopback = tmp_params.loopback;
1211 info->params.flags = tmp_params.flags;
1212 info->params.encoding = tmp_params.encoding;
1213 info->params.clock_speed = tmp_params.clock_speed;
1214 info->params.addr_filter = tmp_params.addr_filter;
1215 info->params.crc_type = tmp_params.crc_type;
1216 info->params.preamble_length = tmp_params.preamble_length;
1217 info->params.preamble = tmp_params.preamble;
1218 info->params.data_rate = tmp_params.data_rate;
1219 info->params.data_bits = tmp_params.data_bits;
1220 info->params.stop_bits = tmp_params.stop_bits;
1221 info->params.parity = tmp_params.parity;
1222 spin_unlock(&info->lock);
1224 change_params(info);
1229 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1230 unsigned int cmd, unsigned long arg)
1232 struct slgt_info *info = tty->driver_data;
1233 int rc = -ENOIOCTLCMD;
1235 if (sanity_check(info, tty->name, "compat_ioctl"))
1237 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1241 case MGSL_IOCSPARAMS32:
1242 rc = set_params32(info, compat_ptr(arg));
1245 case MGSL_IOCGPARAMS32:
1246 rc = get_params32(info, compat_ptr(arg));
1249 case MGSL_IOCGPARAMS:
1250 case MGSL_IOCSPARAMS:
1251 case MGSL_IOCGTXIDLE:
1252 case MGSL_IOCGSTATS:
1253 case MGSL_IOCWAITEVENT:
1257 case MGSL_IOCWAITGPIO:
1259 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1262 case MGSL_IOCSTXIDLE:
1263 case MGSL_IOCTXENABLE:
1264 case MGSL_IOCRXENABLE:
1265 case MGSL_IOCTXABORT:
1268 rc = ioctl(tty, file, cmd, arg);
1272 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1276 #define slgt_compat_ioctl NULL
1277 #endif /* ifdef CONFIG_COMPAT */
1282 static inline int line_info(char *buf, struct slgt_info *info)
1286 unsigned long flags;
1288 ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1289 info->device_name, info->phys_reg_addr,
1290 info->irq_level, info->max_frame_size);
1292 /* output current serial signal states */
1293 spin_lock_irqsave(&info->lock,flags);
1295 spin_unlock_irqrestore(&info->lock,flags);
1299 if (info->signals & SerialSignal_RTS)
1300 strcat(stat_buf, "|RTS");
1301 if (info->signals & SerialSignal_CTS)
1302 strcat(stat_buf, "|CTS");
1303 if (info->signals & SerialSignal_DTR)
1304 strcat(stat_buf, "|DTR");
1305 if (info->signals & SerialSignal_DSR)
1306 strcat(stat_buf, "|DSR");
1307 if (info->signals & SerialSignal_DCD)
1308 strcat(stat_buf, "|CD");
1309 if (info->signals & SerialSignal_RI)
1310 strcat(stat_buf, "|RI");
1312 if (info->params.mode != MGSL_MODE_ASYNC) {
1313 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1314 info->icount.txok, info->icount.rxok);
1315 if (info->icount.txunder)
1316 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1317 if (info->icount.txabort)
1318 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1319 if (info->icount.rxshort)
1320 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1321 if (info->icount.rxlong)
1322 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1323 if (info->icount.rxover)
1324 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1325 if (info->icount.rxcrc)
1326 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1328 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1329 info->icount.tx, info->icount.rx);
1330 if (info->icount.frame)
1331 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1332 if (info->icount.parity)
1333 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1334 if (info->icount.brk)
1335 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1336 if (info->icount.overrun)
1337 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1340 /* Append serial signal status to end */
1341 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1343 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1344 info->tx_active,info->bh_requested,info->bh_running,
1350 /* Called to print information about devices
1352 static int read_proc(char *page, char **start, off_t off, int count,
1353 int *eof, void *data)
1357 struct slgt_info *info;
1359 len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1361 info = slgt_device_list;
1363 l = line_info(page + len, info);
1365 if (len+begin > off+count)
1367 if (len+begin < off) {
1371 info = info->next_device;
1376 if (off >= len+begin)
1378 *start = page + (off-begin);
1379 return ((count < begin+len-off) ? count : begin+len-off);
1383 * return count of bytes in transmit buffer
1385 static int chars_in_buffer(struct tty_struct *tty)
1387 struct slgt_info *info = tty->driver_data;
1389 if (sanity_check(info, tty->name, "chars_in_buffer"))
1391 count = tbuf_bytes(info);
1392 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1397 * signal remote device to throttle send data (our receive data)
1399 static void throttle(struct tty_struct * tty)
1401 struct slgt_info *info = tty->driver_data;
1402 unsigned long flags;
1404 if (sanity_check(info, tty->name, "throttle"))
1406 DBGINFO(("%s throttle\n", info->device_name));
1408 send_xchar(tty, STOP_CHAR(tty));
1409 if (tty->termios->c_cflag & CRTSCTS) {
1410 spin_lock_irqsave(&info->lock,flags);
1411 info->signals &= ~SerialSignal_RTS;
1413 spin_unlock_irqrestore(&info->lock,flags);
1418 * signal remote device to stop throttling send data (our receive data)
1420 static void unthrottle(struct tty_struct * tty)
1422 struct slgt_info *info = tty->driver_data;
1423 unsigned long flags;
1425 if (sanity_check(info, tty->name, "unthrottle"))
1427 DBGINFO(("%s unthrottle\n", info->device_name));
1432 send_xchar(tty, START_CHAR(tty));
1434 if (tty->termios->c_cflag & CRTSCTS) {
1435 spin_lock_irqsave(&info->lock,flags);
1436 info->signals |= SerialSignal_RTS;
1438 spin_unlock_irqrestore(&info->lock,flags);
1443 * set or clear transmit break condition
1444 * break_state -1=set break condition, 0=clear
1446 static int set_break(struct tty_struct *tty, int break_state)
1448 struct slgt_info *info = tty->driver_data;
1449 unsigned short value;
1450 unsigned long flags;
1452 if (sanity_check(info, tty->name, "set_break"))
1454 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1456 spin_lock_irqsave(&info->lock,flags);
1457 value = rd_reg16(info, TCR);
1458 if (break_state == -1)
1462 wr_reg16(info, TCR, value);
1463 spin_unlock_irqrestore(&info->lock,flags);
1467 #if SYNCLINK_GENERIC_HDLC
1470 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1471 * set encoding and frame check sequence (FCS) options
1473 * dev pointer to network device structure
1474 * encoding serial encoding setting
1475 * parity FCS setting
1477 * returns 0 if success, otherwise error code
1479 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1480 unsigned short parity)
1482 struct slgt_info *info = dev_to_port(dev);
1483 unsigned char new_encoding;
1484 unsigned short new_crctype;
1486 /* return error if TTY interface open */
1487 if (info->port.count)
1490 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1494 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1495 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1496 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1497 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1498 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1499 default: return -EINVAL;
1504 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1505 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1506 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1507 default: return -EINVAL;
1510 info->params.encoding = new_encoding;
1511 info->params.crc_type = new_crctype;
1513 /* if network interface up, reprogram hardware */
1521 * called by generic HDLC layer to send frame
1523 * skb socket buffer containing HDLC frame
1524 * dev pointer to network device structure
1526 * returns 0 if success, otherwise error code
1528 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1530 struct slgt_info *info = dev_to_port(dev);
1531 unsigned long flags;
1533 DBGINFO(("%s hdlc_xmit\n", dev->name));
1535 /* stop sending until this frame completes */
1536 netif_stop_queue(dev);
1538 /* copy data to device buffers */
1539 info->tx_count = skb->len;
1540 tx_load(info, skb->data, skb->len);
1542 /* update network statistics */
1543 dev->stats.tx_packets++;
1544 dev->stats.tx_bytes += skb->len;
1546 /* done with socket buffer, so free it */
1549 /* save start time for transmit timeout detection */
1550 dev->trans_start = jiffies;
1552 /* start hardware transmitter if necessary */
1553 spin_lock_irqsave(&info->lock,flags);
1554 if (!info->tx_active)
1556 spin_unlock_irqrestore(&info->lock,flags);
1562 * called by network layer when interface enabled
1563 * claim resources and initialize hardware
1565 * dev pointer to network device structure
1567 * returns 0 if success, otherwise error code
1569 static int hdlcdev_open(struct net_device *dev)
1571 struct slgt_info *info = dev_to_port(dev);
1573 unsigned long flags;
1575 if (!try_module_get(THIS_MODULE))
1578 DBGINFO(("%s hdlcdev_open\n", dev->name));
1580 /* generic HDLC layer open processing */
1581 if ((rc = hdlc_open(dev)))
1584 /* arbitrate between network and tty opens */
1585 spin_lock_irqsave(&info->netlock, flags);
1586 if (info->port.count != 0 || info->netcount != 0) {
1587 DBGINFO(("%s hdlc_open busy\n", dev->name));
1588 spin_unlock_irqrestore(&info->netlock, flags);
1592 spin_unlock_irqrestore(&info->netlock, flags);
1594 /* claim resources and init adapter */
1595 if ((rc = startup(info)) != 0) {
1596 spin_lock_irqsave(&info->netlock, flags);
1598 spin_unlock_irqrestore(&info->netlock, flags);
1602 /* assert DTR and RTS, apply hardware settings */
1603 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1606 /* enable network layer transmit */
1607 dev->trans_start = jiffies;
1608 netif_start_queue(dev);
1610 /* inform generic HDLC layer of current DCD status */
1611 spin_lock_irqsave(&info->lock, flags);
1613 spin_unlock_irqrestore(&info->lock, flags);
1614 if (info->signals & SerialSignal_DCD)
1615 netif_carrier_on(dev);
1617 netif_carrier_off(dev);
1622 * called by network layer when interface is disabled
1623 * shutdown hardware and release resources
1625 * dev pointer to network device structure
1627 * returns 0 if success, otherwise error code
1629 static int hdlcdev_close(struct net_device *dev)
1631 struct slgt_info *info = dev_to_port(dev);
1632 unsigned long flags;
1634 DBGINFO(("%s hdlcdev_close\n", dev->name));
1636 netif_stop_queue(dev);
1638 /* shutdown adapter and release resources */
1643 spin_lock_irqsave(&info->netlock, flags);
1645 spin_unlock_irqrestore(&info->netlock, flags);
1647 module_put(THIS_MODULE);
1652 * called by network layer to process IOCTL call to network device
1654 * dev pointer to network device structure
1655 * ifr pointer to network interface request structure
1656 * cmd IOCTL command code
1658 * returns 0 if success, otherwise error code
1660 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1662 const size_t size = sizeof(sync_serial_settings);
1663 sync_serial_settings new_line;
1664 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1665 struct slgt_info *info = dev_to_port(dev);
1668 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1670 /* return error if TTY interface open */
1671 if (info->port.count)
1674 if (cmd != SIOCWANDEV)
1675 return hdlc_ioctl(dev, ifr, cmd);
1677 switch(ifr->ifr_settings.type) {
1678 case IF_GET_IFACE: /* return current sync_serial_settings */
1680 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1681 if (ifr->ifr_settings.size < size) {
1682 ifr->ifr_settings.size = size; /* data size wanted */
1686 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1687 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1688 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1689 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1692 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1693 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1694 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1695 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1696 default: new_line.clock_type = CLOCK_DEFAULT;
1699 new_line.clock_rate = info->params.clock_speed;
1700 new_line.loopback = info->params.loopback ? 1:0;
1702 if (copy_to_user(line, &new_line, size))
1706 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1708 if(!capable(CAP_NET_ADMIN))
1710 if (copy_from_user(&new_line, line, size))
1713 switch (new_line.clock_type)
1715 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1716 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1717 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1718 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1719 case CLOCK_DEFAULT: flags = info->params.flags &
1720 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1721 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1722 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1723 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1724 default: return -EINVAL;
1727 if (new_line.loopback != 0 && new_line.loopback != 1)
1730 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1731 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1732 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1733 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1734 info->params.flags |= flags;
1736 info->params.loopback = new_line.loopback;
1738 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1739 info->params.clock_speed = new_line.clock_rate;
1741 info->params.clock_speed = 0;
1743 /* if network interface up, reprogram hardware */
1749 return hdlc_ioctl(dev, ifr, cmd);
1754 * called by network layer when transmit timeout is detected
1756 * dev pointer to network device structure
1758 static void hdlcdev_tx_timeout(struct net_device *dev)
1760 struct slgt_info *info = dev_to_port(dev);
1761 unsigned long flags;
1763 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1765 dev->stats.tx_errors++;
1766 dev->stats.tx_aborted_errors++;
1768 spin_lock_irqsave(&info->lock,flags);
1770 spin_unlock_irqrestore(&info->lock,flags);
1772 netif_wake_queue(dev);
1776 * called by device driver when transmit completes
1777 * reenable network layer transmit if stopped
1779 * info pointer to device instance information
1781 static void hdlcdev_tx_done(struct slgt_info *info)
1783 if (netif_queue_stopped(info->netdev))
1784 netif_wake_queue(info->netdev);
1788 * called by device driver when frame received
1789 * pass frame to network layer
1791 * info pointer to device instance information
1792 * buf pointer to buffer contianing frame data
1793 * size count of data bytes in buf
1795 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1797 struct sk_buff *skb = dev_alloc_skb(size);
1798 struct net_device *dev = info->netdev;
1800 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1803 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1804 dev->stats.rx_dropped++;
1808 memcpy(skb_put(skb, size), buf, size);
1810 skb->protocol = hdlc_type_trans(skb, dev);
1812 dev->stats.rx_packets++;
1813 dev->stats.rx_bytes += size;
1817 dev->last_rx = jiffies;
1821 * called by device driver when adding device instance
1822 * do generic HDLC initialization
1824 * info pointer to device instance information
1826 * returns 0 if success, otherwise error code
1828 static int hdlcdev_init(struct slgt_info *info)
1831 struct net_device *dev;
1834 /* allocate and initialize network and HDLC layer objects */
1836 if (!(dev = alloc_hdlcdev(info))) {
1837 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1841 /* for network layer reporting purposes only */
1842 dev->mem_start = info->phys_reg_addr;
1843 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1844 dev->irq = info->irq_level;
1846 /* network layer callbacks and settings */
1847 dev->do_ioctl = hdlcdev_ioctl;
1848 dev->open = hdlcdev_open;
1849 dev->stop = hdlcdev_close;
1850 dev->tx_timeout = hdlcdev_tx_timeout;
1851 dev->watchdog_timeo = 10*HZ;
1852 dev->tx_queue_len = 50;
1854 /* generic HDLC layer callbacks and settings */
1855 hdlc = dev_to_hdlc(dev);
1856 hdlc->attach = hdlcdev_attach;
1857 hdlc->xmit = hdlcdev_xmit;
1859 /* register objects with HDLC layer */
1860 if ((rc = register_hdlc_device(dev))) {
1861 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1871 * called by device driver when removing device instance
1872 * do generic HDLC cleanup
1874 * info pointer to device instance information
1876 static void hdlcdev_exit(struct slgt_info *info)
1878 unregister_hdlc_device(info->netdev);
1879 free_netdev(info->netdev);
1880 info->netdev = NULL;
1883 #endif /* ifdef CONFIG_HDLC */
1886 * get async data from rx DMA buffers
1888 static void rx_async(struct slgt_info *info)
1890 struct tty_struct *tty = info->port.tty;
1891 struct mgsl_icount *icount = &info->icount;
1892 unsigned int start, end;
1894 unsigned char status;
1895 struct slgt_desc *bufs = info->rbufs;
1901 start = end = info->rbuf_current;
1903 while(desc_complete(bufs[end])) {
1904 count = desc_count(bufs[end]) - info->rbuf_index;
1905 p = bufs[end].buf + info->rbuf_index;
1907 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1908 DBGDATA(info, p, count, "rx");
1910 for(i=0 ; i < count; i+=2, p+=2) {
1916 if ((status = *(p+1) & (BIT1 + BIT0))) {
1919 else if (status & BIT0)
1921 /* discard char if tty control flags say so */
1922 if (status & info->ignore_status_mask)
1926 else if (status & BIT0)
1930 tty_insert_flip_char(tty, ch, stat);
1936 /* receive buffer not completed */
1937 info->rbuf_index += i;
1938 mod_timer(&info->rx_timer, jiffies + 1);
1942 info->rbuf_index = 0;
1943 free_rbufs(info, end, end);
1945 if (++end == info->rbuf_count)
1948 /* if entire list searched then no frame available */
1954 tty_flip_buffer_push(tty);
1958 * return next bottom half action to perform
1960 static int bh_action(struct slgt_info *info)
1962 unsigned long flags;
1965 spin_lock_irqsave(&info->lock,flags);
1967 if (info->pending_bh & BH_RECEIVE) {
1968 info->pending_bh &= ~BH_RECEIVE;
1970 } else if (info->pending_bh & BH_TRANSMIT) {
1971 info->pending_bh &= ~BH_TRANSMIT;
1973 } else if (info->pending_bh & BH_STATUS) {
1974 info->pending_bh &= ~BH_STATUS;
1977 /* Mark BH routine as complete */
1978 info->bh_running = false;
1979 info->bh_requested = false;
1983 spin_unlock_irqrestore(&info->lock,flags);
1989 * perform bottom half processing
1991 static void bh_handler(struct work_struct *work)
1993 struct slgt_info *info = container_of(work, struct slgt_info, task);
1998 info->bh_running = true;
2000 while((action = bh_action(info))) {
2003 DBGBH(("%s bh receive\n", info->device_name));
2004 switch(info->params.mode) {
2005 case MGSL_MODE_ASYNC:
2008 case MGSL_MODE_HDLC:
2009 while(rx_get_frame(info));
2012 case MGSL_MODE_MONOSYNC:
2013 case MGSL_MODE_BISYNC:
2014 while(rx_get_buf(info));
2017 /* restart receiver if rx DMA buffers exhausted */
2018 if (info->rx_restart)
2025 DBGBH(("%s bh status\n", info->device_name));
2026 info->ri_chkcount = 0;
2027 info->dsr_chkcount = 0;
2028 info->dcd_chkcount = 0;
2029 info->cts_chkcount = 0;
2032 DBGBH(("%s unknown action\n", info->device_name));
2036 DBGBH(("%s bh_handler exit\n", info->device_name));
2039 static void bh_transmit(struct slgt_info *info)
2041 struct tty_struct *tty = info->port.tty;
2043 DBGBH(("%s bh_transmit\n", info->device_name));
2048 static void dsr_change(struct slgt_info *info, unsigned short status)
2050 if (status & BIT3) {
2051 info->signals |= SerialSignal_DSR;
2052 info->input_signal_events.dsr_up++;
2054 info->signals &= ~SerialSignal_DSR;
2055 info->input_signal_events.dsr_down++;
2057 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2058 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2059 slgt_irq_off(info, IRQ_DSR);
2063 wake_up_interruptible(&info->status_event_wait_q);
2064 wake_up_interruptible(&info->event_wait_q);
2065 info->pending_bh |= BH_STATUS;
2068 static void cts_change(struct slgt_info *info, unsigned short status)
2070 if (status & BIT2) {
2071 info->signals |= SerialSignal_CTS;
2072 info->input_signal_events.cts_up++;
2074 info->signals &= ~SerialSignal_CTS;
2075 info->input_signal_events.cts_down++;
2077 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2078 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2079 slgt_irq_off(info, IRQ_CTS);
2083 wake_up_interruptible(&info->status_event_wait_q);
2084 wake_up_interruptible(&info->event_wait_q);
2085 info->pending_bh |= BH_STATUS;
2087 if (info->port.flags & ASYNC_CTS_FLOW) {
2088 if (info->port.tty) {
2089 if (info->port.tty->hw_stopped) {
2090 if (info->signals & SerialSignal_CTS) {
2091 info->port.tty->hw_stopped = 0;
2092 info->pending_bh |= BH_TRANSMIT;
2096 if (!(info->signals & SerialSignal_CTS))
2097 info->port.tty->hw_stopped = 1;
2103 static void dcd_change(struct slgt_info *info, unsigned short status)
2105 if (status & BIT1) {
2106 info->signals |= SerialSignal_DCD;
2107 info->input_signal_events.dcd_up++;
2109 info->signals &= ~SerialSignal_DCD;
2110 info->input_signal_events.dcd_down++;
2112 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2113 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2114 slgt_irq_off(info, IRQ_DCD);
2118 #if SYNCLINK_GENERIC_HDLC
2119 if (info->netcount) {
2120 if (info->signals & SerialSignal_DCD)
2121 netif_carrier_on(info->netdev);
2123 netif_carrier_off(info->netdev);
2126 wake_up_interruptible(&info->status_event_wait_q);
2127 wake_up_interruptible(&info->event_wait_q);
2128 info->pending_bh |= BH_STATUS;
2130 if (info->port.flags & ASYNC_CHECK_CD) {
2131 if (info->signals & SerialSignal_DCD)
2132 wake_up_interruptible(&info->port.open_wait);
2135 tty_hangup(info->port.tty);
2140 static void ri_change(struct slgt_info *info, unsigned short status)
2142 if (status & BIT0) {
2143 info->signals |= SerialSignal_RI;
2144 info->input_signal_events.ri_up++;
2146 info->signals &= ~SerialSignal_RI;
2147 info->input_signal_events.ri_down++;
2149 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2150 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2151 slgt_irq_off(info, IRQ_RI);
2155 wake_up_interruptible(&info->status_event_wait_q);
2156 wake_up_interruptible(&info->event_wait_q);
2157 info->pending_bh |= BH_STATUS;
2160 static void isr_serial(struct slgt_info *info)
2162 unsigned short status = rd_reg16(info, SSR);
2164 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2166 wr_reg16(info, SSR, status); /* clear pending */
2168 info->irq_occurred = true;
2170 if (info->params.mode == MGSL_MODE_ASYNC) {
2171 if (status & IRQ_TXIDLE) {
2173 isr_txeom(info, status);
2175 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2177 /* process break detection if tty control allows */
2178 if (info->port.tty) {
2179 if (!(status & info->ignore_status_mask)) {
2180 if (info->read_status_mask & MASK_BREAK) {
2181 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2182 if (info->port.flags & ASYNC_SAK)
2183 do_SAK(info->port.tty);
2189 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2190 isr_txeom(info, status);
2192 if (status & IRQ_RXIDLE) {
2193 if (status & RXIDLE)
2194 info->icount.rxidle++;
2196 info->icount.exithunt++;
2197 wake_up_interruptible(&info->event_wait_q);
2200 if (status & IRQ_RXOVER)
2204 if (status & IRQ_DSR)
2205 dsr_change(info, status);
2206 if (status & IRQ_CTS)
2207 cts_change(info, status);
2208 if (status & IRQ_DCD)
2209 dcd_change(info, status);
2210 if (status & IRQ_RI)
2211 ri_change(info, status);
2214 static void isr_rdma(struct slgt_info *info)
2216 unsigned int status = rd_reg32(info, RDCSR);
2218 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2220 /* RDCSR (rx DMA control/status)
2223 * 06 save status byte to DMA buffer
2225 * 04 eol (end of list)
2226 * 03 eob (end of buffer)
2231 wr_reg32(info, RDCSR, status); /* clear pending */
2233 if (status & (BIT5 + BIT4)) {
2234 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2235 info->rx_restart = true;
2237 info->pending_bh |= BH_RECEIVE;
2240 static void isr_tdma(struct slgt_info *info)
2242 unsigned int status = rd_reg32(info, TDCSR);
2244 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2246 /* TDCSR (tx DMA control/status)
2250 * 04 eol (end of list)
2251 * 03 eob (end of buffer)
2256 wr_reg32(info, TDCSR, status); /* clear pending */
2258 if (status & (BIT5 + BIT4 + BIT3)) {
2259 // another transmit buffer has completed
2260 // run bottom half to get more send data from user
2261 info->pending_bh |= BH_TRANSMIT;
2265 static void isr_txeom(struct slgt_info *info, unsigned short status)
2267 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2269 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2272 if (status & IRQ_TXUNDER) {
2273 unsigned short val = rd_reg16(info, TCR);
2274 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2275 wr_reg16(info, TCR, val); /* clear reset bit */
2278 if (info->tx_active) {
2279 if (info->params.mode != MGSL_MODE_ASYNC) {
2280 if (status & IRQ_TXUNDER)
2281 info->icount.txunder++;
2282 else if (status & IRQ_TXIDLE)
2283 info->icount.txok++;
2286 info->tx_active = false;
2289 del_timer(&info->tx_timer);
2291 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2292 info->signals &= ~SerialSignal_RTS;
2293 info->drop_rts_on_tx_done = false;
2297 #if SYNCLINK_GENERIC_HDLC
2299 hdlcdev_tx_done(info);
2303 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2307 info->pending_bh |= BH_TRANSMIT;
2312 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2314 struct cond_wait *w, *prev;
2316 /* wake processes waiting for specific transitions */
2317 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2318 if (w->data & changed) {
2320 wake_up_interruptible(&w->q);
2322 prev->next = w->next;
2324 info->gpio_wait_q = w->next;
2330 /* interrupt service routine
2332 * irq interrupt number
2333 * dev_id device ID supplied during interrupt registration
2335 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2337 struct slgt_info *info = dev_id;
2341 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2343 spin_lock(&info->lock);
2345 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2346 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2347 info->irq_occurred = true;
2348 for(i=0; i < info->port_count ; i++) {
2349 if (info->port_array[i] == NULL)
2351 if (gsr & (BIT8 << i))
2352 isr_serial(info->port_array[i]);
2353 if (gsr & (BIT16 << (i*2)))
2354 isr_rdma(info->port_array[i]);
2355 if (gsr & (BIT17 << (i*2)))
2356 isr_tdma(info->port_array[i]);
2360 if (info->gpio_present) {
2362 unsigned int changed;
2363 while ((changed = rd_reg32(info, IOSR)) != 0) {
2364 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2365 /* read latched state of GPIO signals */
2366 state = rd_reg32(info, IOVR);
2367 /* clear pending GPIO interrupt bits */
2368 wr_reg32(info, IOSR, changed);
2369 for (i=0 ; i < info->port_count ; i++) {
2370 if (info->port_array[i] != NULL)
2371 isr_gpio(info->port_array[i], changed, state);
2376 for(i=0; i < info->port_count ; i++) {
2377 struct slgt_info *port = info->port_array[i];
2379 if (port && (port->port.count || port->netcount) &&
2380 port->pending_bh && !port->bh_running &&
2381 !port->bh_requested) {
2382 DBGISR(("%s bh queued\n", port->device_name));
2383 schedule_work(&port->task);
2384 port->bh_requested = true;
2388 spin_unlock(&info->lock);
2390 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2394 static int startup(struct slgt_info *info)
2396 DBGINFO(("%s startup\n", info->device_name));
2398 if (info->port.flags & ASYNC_INITIALIZED)
2401 if (!info->tx_buf) {
2402 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2403 if (!info->tx_buf) {
2404 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2409 info->pending_bh = 0;
2411 memset(&info->icount, 0, sizeof(info->icount));
2413 /* program hardware for current parameters */
2414 change_params(info);
2417 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2419 info->port.flags |= ASYNC_INITIALIZED;
2425 * called by close() and hangup() to shutdown hardware
2427 static void shutdown(struct slgt_info *info)
2429 unsigned long flags;
2431 if (!(info->port.flags & ASYNC_INITIALIZED))
2434 DBGINFO(("%s shutdown\n", info->device_name));
2436 /* clear status wait queue because status changes */
2437 /* can't happen after shutting down the hardware */
2438 wake_up_interruptible(&info->status_event_wait_q);
2439 wake_up_interruptible(&info->event_wait_q);
2441 del_timer_sync(&info->tx_timer);
2442 del_timer_sync(&info->rx_timer);
2444 kfree(info->tx_buf);
2445 info->tx_buf = NULL;
2447 spin_lock_irqsave(&info->lock,flags);
2452 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2454 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2455 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2459 flush_cond_wait(&info->gpio_wait_q);
2461 spin_unlock_irqrestore(&info->lock,flags);
2464 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2466 info->port.flags &= ~ASYNC_INITIALIZED;
2469 static void program_hw(struct slgt_info *info)
2471 unsigned long flags;
2473 spin_lock_irqsave(&info->lock,flags);
2478 if (info->params.mode != MGSL_MODE_ASYNC ||
2486 info->dcd_chkcount = 0;
2487 info->cts_chkcount = 0;
2488 info->ri_chkcount = 0;
2489 info->dsr_chkcount = 0;
2491 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2494 if (info->netcount ||
2495 (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2498 spin_unlock_irqrestore(&info->lock,flags);
2502 * reconfigure adapter based on new parameters
2504 static void change_params(struct slgt_info *info)
2509 if (!info->port.tty || !info->port.tty->termios)
2511 DBGINFO(("%s change_params\n", info->device_name));
2513 cflag = info->port.tty->termios->c_cflag;
2515 /* if B0 rate (hangup) specified then negate DTR and RTS */
2516 /* otherwise assert DTR and RTS */
2518 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2520 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2522 /* byte size and parity */
2524 switch (cflag & CSIZE) {
2525 case CS5: info->params.data_bits = 5; break;
2526 case CS6: info->params.data_bits = 6; break;
2527 case CS7: info->params.data_bits = 7; break;
2528 case CS8: info->params.data_bits = 8; break;
2529 default: info->params.data_bits = 7; break;
2532 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2535 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2537 info->params.parity = ASYNC_PARITY_NONE;
2539 /* calculate number of jiffies to transmit a full
2540 * FIFO (32 bytes) at specified data rate
2542 bits_per_char = info->params.data_bits +
2543 info->params.stop_bits + 1;
2545 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2547 if (info->params.data_rate) {
2548 info->timeout = (32*HZ*bits_per_char) /
2549 info->params.data_rate;
2551 info->timeout += HZ/50; /* Add .02 seconds of slop */
2553 if (cflag & CRTSCTS)
2554 info->port.flags |= ASYNC_CTS_FLOW;
2556 info->port.flags &= ~ASYNC_CTS_FLOW;
2559 info->port.flags &= ~ASYNC_CHECK_CD;
2561 info->port.flags |= ASYNC_CHECK_CD;
2563 /* process tty input control flags */
2565 info->read_status_mask = IRQ_RXOVER;
2566 if (I_INPCK(info->port.tty))
2567 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2568 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2569 info->read_status_mask |= MASK_BREAK;
2570 if (I_IGNPAR(info->port.tty))
2571 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2572 if (I_IGNBRK(info->port.tty)) {
2573 info->ignore_status_mask |= MASK_BREAK;
2574 /* If ignoring parity and break indicators, ignore
2575 * overruns too. (For real raw support).
2577 if (I_IGNPAR(info->port.tty))
2578 info->ignore_status_mask |= MASK_OVERRUN;
2584 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2586 DBGINFO(("%s get_stats\n", info->device_name));
2588 memset(&info->icount, 0, sizeof(info->icount));
2590 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2596 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2598 DBGINFO(("%s get_params\n", info->device_name));
2599 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2604 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2606 unsigned long flags;
2607 MGSL_PARAMS tmp_params;
2609 DBGINFO(("%s set_params\n", info->device_name));
2610 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2613 spin_lock_irqsave(&info->lock, flags);
2614 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2615 spin_unlock_irqrestore(&info->lock, flags);
2617 change_params(info);
2622 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2624 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2625 if (put_user(info->idle_mode, idle_mode))
2630 static int set_txidle(struct slgt_info *info, int idle_mode)
2632 unsigned long flags;
2633 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2634 spin_lock_irqsave(&info->lock,flags);
2635 info->idle_mode = idle_mode;
2636 if (info->params.mode != MGSL_MODE_ASYNC)
2638 spin_unlock_irqrestore(&info->lock,flags);
2642 static int tx_enable(struct slgt_info *info, int enable)
2644 unsigned long flags;
2645 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2646 spin_lock_irqsave(&info->lock,flags);
2648 if (!info->tx_enabled)
2651 if (info->tx_enabled)
2654 spin_unlock_irqrestore(&info->lock,flags);
2659 * abort transmit HDLC frame
2661 static int tx_abort(struct slgt_info *info)
2663 unsigned long flags;
2664 DBGINFO(("%s tx_abort\n", info->device_name));
2665 spin_lock_irqsave(&info->lock,flags);
2667 spin_unlock_irqrestore(&info->lock,flags);
2671 static int rx_enable(struct slgt_info *info, int enable)
2673 unsigned long flags;
2674 unsigned int rbuf_fill_level;
2675 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2676 spin_lock_irqsave(&info->lock,flags);
2678 * enable[31..16] = receive DMA buffer fill level
2679 * 0 = noop (leave fill level unchanged)
2680 * fill level must be multiple of 4 and <= buffer size
2682 rbuf_fill_level = ((unsigned int)enable) >> 16;
2683 if (rbuf_fill_level) {
2684 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2685 spin_unlock_irqrestore(&info->lock, flags);
2688 info->rbuf_fill_level = rbuf_fill_level;
2689 rx_stop(info); /* restart receiver to use new fill level */
2693 * enable[1..0] = receiver enable command
2696 * 2 = enable or force hunt mode if already enabled
2700 if (!info->rx_enabled)
2702 else if (enable == 2) {
2703 /* force hunt mode (write 1 to RCR[3]) */
2704 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2707 if (info->rx_enabled)
2710 spin_unlock_irqrestore(&info->lock,flags);
2715 * wait for specified event to occur
2717 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2719 unsigned long flags;
2722 struct mgsl_icount cprev, cnow;
2725 struct _input_signal_events oldsigs, newsigs;
2726 DECLARE_WAITQUEUE(wait, current);
2728 if (get_user(mask, mask_ptr))
2731 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2733 spin_lock_irqsave(&info->lock,flags);
2735 /* return immediately if state matches requested events */
2740 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2741 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2742 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2743 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2745 spin_unlock_irqrestore(&info->lock,flags);
2749 /* save current irq counts */
2750 cprev = info->icount;
2751 oldsigs = info->input_signal_events;
2753 /* enable hunt and idle irqs if needed */
2754 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2755 unsigned short val = rd_reg16(info, SCR);
2756 if (!(val & IRQ_RXIDLE))
2757 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2760 set_current_state(TASK_INTERRUPTIBLE);
2761 add_wait_queue(&info->event_wait_q, &wait);
2763 spin_unlock_irqrestore(&info->lock,flags);
2767 if (signal_pending(current)) {
2772 /* get current irq counts */
2773 spin_lock_irqsave(&info->lock,flags);
2774 cnow = info->icount;
2775 newsigs = info->input_signal_events;
2776 set_current_state(TASK_INTERRUPTIBLE);
2777 spin_unlock_irqrestore(&info->lock,flags);
2779 /* if no change, wait aborted for some reason */
2780 if (newsigs.dsr_up == oldsigs.dsr_up &&
2781 newsigs.dsr_down == oldsigs.dsr_down &&
2782 newsigs.dcd_up == oldsigs.dcd_up &&
2783 newsigs.dcd_down == oldsigs.dcd_down &&
2784 newsigs.cts_up == oldsigs.cts_up &&
2785 newsigs.cts_down == oldsigs.cts_down &&
2786 newsigs.ri_up == oldsigs.ri_up &&
2787 newsigs.ri_down == oldsigs.ri_down &&
2788 cnow.exithunt == cprev.exithunt &&
2789 cnow.rxidle == cprev.rxidle) {
2795 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2796 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2797 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2798 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2799 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2800 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2801 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2802 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2803 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2804 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2812 remove_wait_queue(&info->event_wait_q, &wait);
2813 set_current_state(TASK_RUNNING);
2816 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2817 spin_lock_irqsave(&info->lock,flags);
2818 if (!waitqueue_active(&info->event_wait_q)) {
2819 /* disable enable exit hunt mode/idle rcvd IRQs */
2821 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2823 spin_unlock_irqrestore(&info->lock,flags);
2827 rc = put_user(events, mask_ptr);
2831 static int get_interface(struct slgt_info *info, int __user *if_mode)
2833 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2834 if (put_user(info->if_mode, if_mode))
2839 static int set_interface(struct slgt_info *info, int if_mode)
2841 unsigned long flags;
2844 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2845 spin_lock_irqsave(&info->lock,flags);
2846 info->if_mode = if_mode;
2850 /* TCR (tx control) 07 1=RTS driver control */
2851 val = rd_reg16(info, TCR);
2852 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2856 wr_reg16(info, TCR, val);
2858 spin_unlock_irqrestore(&info->lock,flags);
2863 * set general purpose IO pin state and direction
2866 * state each bit indicates a pin state
2867 * smask set bit indicates pin state to set
2868 * dir each bit indicates a pin direction (0=input, 1=output)
2869 * dmask set bit indicates pin direction to set
2871 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2873 unsigned long flags;
2874 struct gpio_desc gpio;
2877 if (!info->gpio_present)
2879 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2881 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2882 info->device_name, gpio.state, gpio.smask,
2883 gpio.dir, gpio.dmask));
2885 spin_lock_irqsave(&info->lock,flags);
2887 data = rd_reg32(info, IODR);
2888 data |= gpio.dmask & gpio.dir;
2889 data &= ~(gpio.dmask & ~gpio.dir);
2890 wr_reg32(info, IODR, data);
2893 data = rd_reg32(info, IOVR);
2894 data |= gpio.smask & gpio.state;
2895 data &= ~(gpio.smask & ~gpio.state);
2896 wr_reg32(info, IOVR, data);
2898 spin_unlock_irqrestore(&info->lock,flags);
2904 * get general purpose IO pin state and direction
2906 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2908 struct gpio_desc gpio;
2909 if (!info->gpio_present)
2911 gpio.state = rd_reg32(info, IOVR);
2912 gpio.smask = 0xffffffff;
2913 gpio.dir = rd_reg32(info, IODR);
2914 gpio.dmask = 0xffffffff;
2915 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2917 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2918 info->device_name, gpio.state, gpio.dir));
2923 * conditional wait facility
2925 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2927 init_waitqueue_head(&w->q);
2928 init_waitqueue_entry(&w->wait, current);
2932 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2934 set_current_state(TASK_INTERRUPTIBLE);
2935 add_wait_queue(&w->q, &w->wait);
2940 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2942 struct cond_wait *w, *prev;
2943 remove_wait_queue(&cw->q, &cw->wait);
2944 set_current_state(TASK_RUNNING);
2945 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2948 prev->next = w->next;
2956 static void flush_cond_wait(struct cond_wait **head)
2958 while (*head != NULL) {
2959 wake_up_interruptible(&(*head)->q);
2960 *head = (*head)->next;
2965 * wait for general purpose I/O pin(s) to enter specified state
2968 * state - bit indicates target pin state
2969 * smask - set bit indicates watched pin
2971 * The wait ends when at least one watched pin enters the specified
2972 * state. When 0 (no error) is returned, user_gpio->state is set to the
2973 * state of all GPIO pins when the wait ends.
2975 * Note: Each pin may be a dedicated input, dedicated output, or
2976 * configurable input/output. The number and configuration of pins
2977 * varies with the specific adapter model. Only input pins (dedicated
2978 * or configured) can be monitored with this function.
2980 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2982 unsigned long flags;
2984 struct gpio_desc gpio;
2985 struct cond_wait wait;
2988 if (!info->gpio_present)
2990 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2992 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2993 info->device_name, gpio.state, gpio.smask));
2994 /* ignore output pins identified by set IODR bit */
2995 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2997 init_cond_wait(&wait, gpio.smask);
2999 spin_lock_irqsave(&info->lock, flags);
3000 /* enable interrupts for watched pins */
3001 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3002 /* get current pin states */
3003 state = rd_reg32(info, IOVR);
3005 if (gpio.smask & ~(state ^ gpio.state)) {
3006 /* already in target state */
3009 /* wait for target state */
3010 add_cond_wait(&info->gpio_wait_q, &wait);
3011 spin_unlock_irqrestore(&info->lock, flags);
3013 if (signal_pending(current))
3016 gpio.state = wait.data;
3017 spin_lock_irqsave(&info->lock, flags);
3018 remove_cond_wait(&info->gpio_wait_q, &wait);
3021 /* disable all GPIO interrupts if no waiting processes */
3022 if (info->gpio_wait_q == NULL)
3023 wr_reg32(info, IOER, 0);
3024 spin_unlock_irqrestore(&info->lock,flags);
3026 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3031 static int modem_input_wait(struct slgt_info *info,int arg)
3033 unsigned long flags;
3035 struct mgsl_icount cprev, cnow;
3036 DECLARE_WAITQUEUE(wait, current);
3038 /* save current irq counts */
3039 spin_lock_irqsave(&info->lock,flags);
3040 cprev = info->icount;
3041 add_wait_queue(&info->status_event_wait_q, &wait);
3042 set_current_state(TASK_INTERRUPTIBLE);
3043 spin_unlock_irqrestore(&info->lock,flags);
3047 if (signal_pending(current)) {
3052 /* get new irq counts */
3053 spin_lock_irqsave(&info->lock,flags);
3054 cnow = info->icount;
3055 set_current_state(TASK_INTERRUPTIBLE);
3056 spin_unlock_irqrestore(&info->lock,flags);
3058 /* if no change, wait aborted for some reason */
3059 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3060 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3065 /* check for change in caller specified modem input */
3066 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3067 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3068 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3069 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3076 remove_wait_queue(&info->status_event_wait_q, &wait);
3077 set_current_state(TASK_RUNNING);
3082 * return state of serial control and status signals
3084 static int tiocmget(struct tty_struct *tty, struct file *file)
3086 struct slgt_info *info = tty->driver_data;
3087 unsigned int result;
3088 unsigned long flags;
3090 spin_lock_irqsave(&info->lock,flags);
3092 spin_unlock_irqrestore(&info->lock,flags);
3094 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3095 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3096 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3097 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3098 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3099 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3101 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3106 * set modem control signals (DTR/RTS)
3108 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3109 * TIOCMSET = set/clear signal values
3110 * value bit mask for command
3112 static int tiocmset(struct tty_struct *tty, struct file *file,
3113 unsigned int set, unsigned int clear)
3115 struct slgt_info *info = tty->driver_data;
3116 unsigned long flags;
3118 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3120 if (set & TIOCM_RTS)
3121 info->signals |= SerialSignal_RTS;
3122 if (set & TIOCM_DTR)
3123 info->signals |= SerialSignal_DTR;
3124 if (clear & TIOCM_RTS)
3125 info->signals &= ~SerialSignal_RTS;
3126 if (clear & TIOCM_DTR)
3127 info->signals &= ~SerialSignal_DTR;
3129 spin_lock_irqsave(&info->lock,flags);
3131 spin_unlock_irqrestore(&info->lock,flags);
3135 static int carrier_raised(struct tty_port *port)
3137 unsigned long flags;
3138 struct slgt_info *info = container_of(port, struct slgt_info, port);
3140 spin_lock_irqsave(&info->lock,flags);
3142 spin_unlock_irqrestore(&info->lock,flags);
3143 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3147 * block current process until the device is ready to open
3149 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3150 struct slgt_info *info)
3152 DECLARE_WAITQUEUE(wait, current);
3154 bool do_clocal = false;
3155 bool extra_count = false;
3156 unsigned long flags;
3158 struct tty_port *port = &info->port;
3160 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3162 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3163 /* nonblock mode is set or port is not enabled */
3164 port->flags |= ASYNC_NORMAL_ACTIVE;
3168 if (tty->termios->c_cflag & CLOCAL)
3171 /* Wait for carrier detect and the line to become
3172 * free (i.e., not in use by the callout). While we are in
3173 * this loop, port->count is dropped by one, so that
3174 * close() knows when to free things. We restore it upon
3175 * exit, either normal or abnormal.
3179 add_wait_queue(&port->open_wait, &wait);
3181 spin_lock_irqsave(&info->lock, flags);
3182 if (!tty_hung_up_p(filp)) {
3186 spin_unlock_irqrestore(&info->lock, flags);
3187 port->blocked_open++;
3190 if ((tty->termios->c_cflag & CBAUD)) {
3191 spin_lock_irqsave(&info->lock,flags);
3192 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3194 spin_unlock_irqrestore(&info->lock,flags);
3197 set_current_state(TASK_INTERRUPTIBLE);
3199 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3200 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3201 -EAGAIN : -ERESTARTSYS;
3205 cd = tty_port_carrier_raised(port);
3207 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3210 if (signal_pending(current)) {
3211 retval = -ERESTARTSYS;
3215 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3219 set_current_state(TASK_RUNNING);
3220 remove_wait_queue(&port->open_wait, &wait);
3224 port->blocked_open--;
3227 port->flags |= ASYNC_NORMAL_ACTIVE;
3229 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3233 static int alloc_tmp_rbuf(struct slgt_info *info)
3235 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3236 if (info->tmp_rbuf == NULL)
3241 static void free_tmp_rbuf(struct slgt_info *info)
3243 kfree(info->tmp_rbuf);
3244 info->tmp_rbuf = NULL;
3248 * allocate DMA descriptor lists.
3250 static int alloc_desc(struct slgt_info *info)
3255 /* allocate memory to hold descriptor lists */
3256 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3257 if (info->bufs == NULL)
3260 memset(info->bufs, 0, DESC_LIST_SIZE);
3262 info->rbufs = (struct slgt_desc*)info->bufs;
3263 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3265 pbufs = (unsigned int)info->bufs_dma_addr;
3268 * Build circular lists of descriptors
3271 for (i=0; i < info->rbuf_count; i++) {
3272 /* physical address of this descriptor */
3273 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3275 /* physical address of next descriptor */
3276 if (i == info->rbuf_count - 1)
3277 info->rbufs[i].next = cpu_to_le32(pbufs);
3279 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3280 set_desc_count(info->rbufs[i], DMABUFSIZE);
3283 for (i=0; i < info->tbuf_count; i++) {
3284 /* physical address of this descriptor */
3285 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3287 /* physical address of next descriptor */
3288 if (i == info->tbuf_count - 1)
3289 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3291 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3297 static void free_desc(struct slgt_info *info)
3299 if (info->bufs != NULL) {
3300 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3307 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3310 for (i=0; i < count; i++) {
3311 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3313 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3318 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3321 for (i=0; i < count; i++) {
3322 if (bufs[i].buf == NULL)
3324 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3329 static int alloc_dma_bufs(struct slgt_info *info)
3331 info->rbuf_count = 32;
3332 info->tbuf_count = 32;
3334 if (alloc_desc(info) < 0 ||
3335 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3336 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3337 alloc_tmp_rbuf(info) < 0) {
3338 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3345 static void free_dma_bufs(struct slgt_info *info)
3348 free_bufs(info, info->rbufs, info->rbuf_count);
3349 free_bufs(info, info->tbufs, info->tbuf_count);
3352 free_tmp_rbuf(info);
3355 static int claim_resources(struct slgt_info *info)
3357 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3358 DBGERR(("%s reg addr conflict, addr=%08X\n",
3359 info->device_name, info->phys_reg_addr));
3360 info->init_error = DiagStatus_AddressConflict;
3364 info->reg_addr_requested = true;
3366 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3367 if (!info->reg_addr) {
3368 DBGERR(("%s cant map device registers, addr=%08X\n",
3369 info->device_name, info->phys_reg_addr));
3370 info->init_error = DiagStatus_CantAssignPciResources;
3376 release_resources(info);
3380 static void release_resources(struct slgt_info *info)
3382 if (info->irq_requested) {
3383 free_irq(info->irq_level, info);
3384 info->irq_requested = false;
3387 if (info->reg_addr_requested) {
3388 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3389 info->reg_addr_requested = false;
3392 if (info->reg_addr) {
3393 iounmap(info->reg_addr);
3394 info->reg_addr = NULL;
3398 /* Add the specified device instance data structure to the
3399 * global linked list of devices and increment the device count.
3401 static void add_device(struct slgt_info *info)
3405 info->next_device = NULL;
3406 info->line = slgt_device_count;
3407 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3409 if (info->line < MAX_DEVICES) {
3410 if (maxframe[info->line])
3411 info->max_frame_size = maxframe[info->line];
3414 slgt_device_count++;
3416 if (!slgt_device_list)
3417 slgt_device_list = info;
3419 struct slgt_info *current_dev = slgt_device_list;
3420 while(current_dev->next_device)
3421 current_dev = current_dev->next_device;
3422 current_dev->next_device = info;
3425 if (info->max_frame_size < 4096)
3426 info->max_frame_size = 4096;
3427 else if (info->max_frame_size > 65535)
3428 info->max_frame_size = 65535;
3430 switch(info->pdev->device) {
3431 case SYNCLINK_GT_DEVICE_ID:
3434 case SYNCLINK_GT2_DEVICE_ID:
3437 case SYNCLINK_GT4_DEVICE_ID:
3440 case SYNCLINK_AC_DEVICE_ID:
3442 info->params.mode = MGSL_MODE_ASYNC;
3445 devstr = "(unknown model)";
3447 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3448 devstr, info->device_name, info->phys_reg_addr,
3449 info->irq_level, info->max_frame_size);
3451 #if SYNCLINK_GENERIC_HDLC
3456 static const struct tty_port_operations slgt_port_ops = {
3457 .carrier_raised = carrier_raised,
3461 * allocate device instance structure, return NULL on failure
3463 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3465 struct slgt_info *info;
3467 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3470 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3471 driver_name, adapter_num, port_num));
3473 tty_port_init(&info->port);
3474 info->port.ops = &slgt_port_ops;
3475 info->magic = MGSL_MAGIC;
3476 INIT_WORK(&info->task, bh_handler);
3477 info->max_frame_size = 4096;
3478 info->rbuf_fill_level = DMABUFSIZE;
3479 info->port.close_delay = 5*HZ/10;
3480 info->port.closing_wait = 30*HZ;
3481 init_waitqueue_head(&info->status_event_wait_q);
3482 init_waitqueue_head(&info->event_wait_q);
3483 spin_lock_init(&info->netlock);
3484 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3485 info->idle_mode = HDLC_TXIDLE_FLAGS;
3486 info->adapter_num = adapter_num;
3487 info->port_num = port_num;
3489 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3490 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3492 /* Copy configuration info to device instance data */
3494 info->irq_level = pdev->irq;
3495 info->phys_reg_addr = pci_resource_start(pdev,0);
3497 info->bus_type = MGSL_BUS_TYPE_PCI;
3498 info->irq_flags = IRQF_SHARED;
3500 info->init_error = -1; /* assume error, set to 0 on successful init */
3506 static void device_init(int adapter_num, struct pci_dev *pdev)
3508 struct slgt_info *port_array[SLGT_MAX_PORTS];
3512 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3514 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3517 /* allocate device instances for all ports */
3518 for (i=0; i < port_count; ++i) {
3519 port_array[i] = alloc_dev(adapter_num, i, pdev);
3520 if (port_array[i] == NULL) {
3521 for (--i; i >= 0; --i)
3522 kfree(port_array[i]);
3527 /* give copy of port_array to all ports and add to device list */
3528 for (i=0; i < port_count; ++i) {
3529 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3530 add_device(port_array[i]);
3531 port_array[i]->port_count = port_count;
3532 spin_lock_init(&port_array[i]->lock);
3535 /* Allocate and claim adapter resources */
3536 if (!claim_resources(port_array[0])) {
3538 alloc_dma_bufs(port_array[0]);
3540 /* copy resource information from first port to others */
3541 for (i = 1; i < port_count; ++i) {
3542 port_array[i]->lock = port_array[0]->lock;
3543 port_array[i]->irq_level = port_array[0]->irq_level;
3544 port_array[i]->reg_addr = port_array[0]->reg_addr;
3545 alloc_dma_bufs(port_array[i]);
3548 if (request_irq(port_array[0]->irq_level,
3550 port_array[0]->irq_flags,
3551 port_array[0]->device_name,
3552 port_array[0]) < 0) {
3553 DBGERR(("%s request_irq failed IRQ=%d\n",
3554 port_array[0]->device_name,
3555 port_array[0]->irq_level));
3557 port_array[0]->irq_requested = true;
3558 adapter_test(port_array[0]);
3559 for (i=1 ; i < port_count ; i++) {
3560 port_array[i]->init_error = port_array[0]->init_error;
3561 port_array[i]->gpio_present = port_array[0]->gpio_present;
3566 for (i=0; i < port_count; ++i)
3567 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3570 static int __devinit init_one(struct pci_dev *dev,
3571 const struct pci_device_id *ent)
3573 if (pci_enable_device(dev)) {
3574 printk("error enabling pci device %p\n", dev);
3577 pci_set_master(dev);
3578 device_init(slgt_device_count, dev);
3582 static void __devexit remove_one(struct pci_dev *dev)
3586 static const struct tty_operations ops = {
3590 .put_char = put_char,
3591 .flush_chars = flush_chars,
3592 .write_room = write_room,
3593 .chars_in_buffer = chars_in_buffer,
3594 .flush_buffer = flush_buffer,
3596 .compat_ioctl = slgt_compat_ioctl,
3597 .throttle = throttle,
3598 .unthrottle = unthrottle,
3599 .send_xchar = send_xchar,
3600 .break_ctl = set_break,
3601 .wait_until_sent = wait_until_sent,
3602 .read_proc = read_proc,
3603 .set_termios = set_termios,
3605 .start = tx_release,
3607 .tiocmget = tiocmget,
3608 .tiocmset = tiocmset,
3611 static void slgt_cleanup(void)
3614 struct slgt_info *info;
3615 struct slgt_info *tmp;
3617 printk("unload %s %s\n", driver_name, driver_version);
3619 if (serial_driver) {
3620 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3621 tty_unregister_device(serial_driver, info->line);
3622 if ((rc = tty_unregister_driver(serial_driver)))
3623 DBGERR(("tty_unregister_driver error=%d\n", rc));
3624 put_tty_driver(serial_driver);
3628 info = slgt_device_list;
3631 info = info->next_device;
3634 /* release devices */
3635 info = slgt_device_list;
3637 #if SYNCLINK_GENERIC_HDLC
3640 free_dma_bufs(info);
3641 free_tmp_rbuf(info);
3642 if (info->port_num == 0)
3643 release_resources(info);
3645 info = info->next_device;
3650 pci_unregister_driver(&pci_driver);
3654 * Driver initialization entry point.
3656 static int __init slgt_init(void)
3660 printk("%s %s\n", driver_name, driver_version);
3662 serial_driver = alloc_tty_driver(MAX_DEVICES);
3663 if (!serial_driver) {
3664 printk("%s can't allocate tty driver\n", driver_name);
3668 /* Initialize the tty_driver structure */
3670 serial_driver->owner = THIS_MODULE;
3671 serial_driver->driver_name = tty_driver_name;
3672 serial_driver->name = tty_dev_prefix;
3673 serial_driver->major = ttymajor;
3674 serial_driver->minor_start = 64;
3675 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3676 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3677 serial_driver->init_termios = tty_std_termios;
3678 serial_driver->init_termios.c_cflag =
3679 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3680 serial_driver->init_termios.c_ispeed = 9600;
3681 serial_driver->init_termios.c_ospeed = 9600;
3682 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3683 tty_set_operations(serial_driver, &ops);
3684 if ((rc = tty_register_driver(serial_driver)) < 0) {
3685 DBGERR(("%s can't register serial driver\n", driver_name));
3686 put_tty_driver(serial_driver);
3687 serial_driver = NULL;
3691 printk("%s %s, tty major#%d\n",
3692 driver_name, driver_version,
3693 serial_driver->major);
3695 slgt_device_count = 0;
3696 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3697 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3700 pci_registered = true;
3702 if (!slgt_device_list)
3703 printk("%s no devices found\n",driver_name);
3712 static void __exit slgt_exit(void)
3717 module_init(slgt_init);
3718 module_exit(slgt_exit);
3721 * register access routines
3724 #define CALC_REGADDR() \
3725 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3727 reg_addr += (info->port_num) * 32;
3729 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3732 return readb((void __iomem *)reg_addr);
3735 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3738 writeb(value, (void __iomem *)reg_addr);
3741 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3744 return readw((void __iomem *)reg_addr);
3747 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3750 writew(value, (void __iomem *)reg_addr);
3753 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3756 return readl((void __iomem *)reg_addr);
3759 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3762 writel(value, (void __iomem *)reg_addr);
3765 static void rdma_reset(struct slgt_info *info)
3770 wr_reg32(info, RDCSR, BIT1);
3772 /* wait for enable bit cleared */
3773 for(i=0 ; i < 1000 ; i++)
3774 if (!(rd_reg32(info, RDCSR) & BIT0))
3778 static void tdma_reset(struct slgt_info *info)
3783 wr_reg32(info, TDCSR, BIT1);
3785 /* wait for enable bit cleared */
3786 for(i=0 ; i < 1000 ; i++)
3787 if (!(rd_reg32(info, TDCSR) & BIT0))
3792 * enable internal loopback
3793 * TxCLK and RxCLK are generated from BRG
3794 * and TxD is looped back to RxD internally.
3796 static void enable_loopback(struct slgt_info *info)
3798 /* SCR (serial control) BIT2=looopback enable */
3799 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3801 if (info->params.mode != MGSL_MODE_ASYNC) {
3802 /* CCR (clock control)
3803 * 07..05 tx clock source (010 = BRG)
3804 * 04..02 rx clock source (010 = BRG)
3805 * 01 auxclk enable (0 = disable)
3806 * 00 BRG enable (1 = enable)
3810 wr_reg8(info, CCR, 0x49);
3812 /* set speed if available, otherwise use default */
3813 if (info->params.clock_speed)
3814 set_rate(info, info->params.clock_speed);
3816 set_rate(info, 3686400);
3821 * set baud rate generator to specified rate
3823 static void set_rate(struct slgt_info *info, u32 rate)
3826 static unsigned int osc = 14745600;
3828 /* div = osc/rate - 1
3830 * Round div up if osc/rate is not integer to
3831 * force to next slowest rate.
3836 if (!(osc % rate) && div)
3838 wr_reg16(info, BDR, (unsigned short)div);
3842 static void rx_stop(struct slgt_info *info)
3846 /* disable and reset receiver */
3847 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3848 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3849 wr_reg16(info, RCR, val); /* clear reset bit */
3851 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3853 /* clear pending rx interrupts */
3854 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3858 info->rx_enabled = false;
3859 info->rx_restart = false;
3862 static void rx_start(struct slgt_info *info)
3866 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3868 /* clear pending rx overrun IRQ */
3869 wr_reg16(info, SSR, IRQ_RXOVER);
3871 /* reset and disable receiver */
3872 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3873 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3874 wr_reg16(info, RCR, val); /* clear reset bit */
3879 /* set 1st descriptor address */
3880 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3882 if (info->params.mode != MGSL_MODE_ASYNC) {
3883 /* enable rx DMA and DMA interrupt */
3884 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3886 /* enable saving of rx status, rx DMA and DMA interrupt */
3887 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3890 slgt_irq_on(info, IRQ_RXOVER);
3892 /* enable receiver */
3893 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3895 info->rx_restart = false;
3896 info->rx_enabled = true;
3899 static void tx_start(struct slgt_info *info)
3901 if (!info->tx_enabled) {
3903 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3904 info->tx_enabled = true;
3907 if (info->tx_count) {
3908 info->drop_rts_on_tx_done = false;
3910 if (info->params.mode != MGSL_MODE_ASYNC) {
3911 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3913 if (!(info->signals & SerialSignal_RTS)) {
3914 info->signals |= SerialSignal_RTS;
3916 info->drop_rts_on_tx_done = true;
3920 slgt_irq_off(info, IRQ_TXDATA);
3921 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3922 /* clear tx idle and underrun status bits */
3923 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3924 if (info->params.mode == MGSL_MODE_HDLC)
3925 mod_timer(&info->tx_timer, jiffies +
3926 msecs_to_jiffies(5000));
3928 slgt_irq_off(info, IRQ_TXDATA);
3929 slgt_irq_on(info, IRQ_TXIDLE);
3930 /* clear tx idle status bit */
3931 wr_reg16(info, SSR, IRQ_TXIDLE);
3934 info->tx_active = true;
3939 * start transmit DMA if inactive and there are unsent buffers
3941 static void tdma_start(struct slgt_info *info)
3945 if (rd_reg32(info, TDCSR) & BIT0)
3948 /* transmit DMA inactive, check for unsent buffers */
3949 i = info->tbuf_start;
3950 while (!desc_count(info->tbufs[i])) {
3951 if (++i == info->tbuf_count)
3953 if (i == info->tbuf_current)
3956 info->tbuf_start = i;
3958 /* there are unsent buffers, start transmit DMA */
3960 /* reset needed if previous error condition */
3963 /* set 1st descriptor address */
3964 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3965 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3968 static void tx_stop(struct slgt_info *info)
3972 del_timer(&info->tx_timer);
3976 /* reset and disable transmitter */
3977 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3978 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3980 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3982 /* clear tx idle and underrun status bit */
3983 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3987 info->tx_enabled = false;
3988 info->tx_active = false;
3991 static void reset_port(struct slgt_info *info)
3993 if (!info->reg_addr)
3999 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4002 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4005 static void reset_adapter(struct slgt_info *info)
4008 for (i=0; i < info->port_count; ++i) {
4009 if (info->port_array[i])
4010 reset_port(info->port_array[i]);
4014 static void async_mode(struct slgt_info *info)
4018 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4024 * 15..13 mode, 010=async
4025 * 12..10 encoding, 000=NRZ
4027 * 08 1=odd parity, 0=even parity
4028 * 07 1=RTS driver control
4030 * 05..04 character length
4035 * 03 0=1 stop bit, 1=2 stop bits
4038 * 00 auto-CTS enable
4042 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4045 if (info->params.parity != ASYNC_PARITY_NONE) {
4047 if (info->params.parity == ASYNC_PARITY_ODD)
4051 switch (info->params.data_bits)
4053 case 6: val |= BIT4; break;
4054 case 7: val |= BIT5; break;
4055 case 8: val |= BIT5 + BIT4; break;
4058 if (info->params.stop_bits != 1)
4061 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4064 wr_reg16(info, TCR, val);
4068 * 15..13 mode, 010=async
4069 * 12..10 encoding, 000=NRZ
4071 * 08 1=odd parity, 0=even parity
4072 * 07..06 reserved, must be 0
4073 * 05..04 character length
4078 * 03 reserved, must be zero
4081 * 00 auto-DCD enable
4085 if (info->params.parity != ASYNC_PARITY_NONE) {
4087 if (info->params.parity == ASYNC_PARITY_ODD)
4091 switch (info->params.data_bits)
4093 case 6: val |= BIT4; break;
4094 case 7: val |= BIT5; break;
4095 case 8: val |= BIT5 + BIT4; break;
4098 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4101 wr_reg16(info, RCR, val);
4103 /* CCR (clock control)
4105 * 07..05 011 = tx clock source is BRG/16
4106 * 04..02 010 = rx clock source is BRG
4107 * 01 0 = auxclk disabled
4108 * 00 1 = BRG enabled
4112 wr_reg8(info, CCR, 0x69);
4116 /* SCR (serial control)
4118 * 15 1=tx req on FIFO half empty
4119 * 14 1=rx req on FIFO half full
4120 * 13 tx data IRQ enable
4121 * 12 tx idle IRQ enable
4122 * 11 rx break on IRQ enable
4123 * 10 rx data IRQ enable
4124 * 09 rx break off IRQ enable
4125 * 08 overrun IRQ enable
4130 * 03 reserved, must be zero
4131 * 02 1=txd->rxd internal loopback enable
4132 * 01 reserved, must be zero
4133 * 00 1=master IRQ enable
4135 val = BIT15 + BIT14 + BIT0;
4136 wr_reg16(info, SCR, val);
4138 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4140 set_rate(info, info->params.data_rate * 16);
4142 if (info->params.loopback)
4143 enable_loopback(info);
4146 static void sync_mode(struct slgt_info *info)
4150 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4156 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4160 * 07 1=RTS driver control
4161 * 06 preamble enable
4162 * 05..04 preamble length
4163 * 03 share open/close flag
4166 * 00 auto-CTS enable
4170 switch(info->params.mode) {
4171 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4172 case MGSL_MODE_BISYNC: val |= BIT15; break;
4173 case MGSL_MODE_RAW: val |= BIT13; break;
4175 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4178 switch(info->params.encoding)
4180 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4181 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4182 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4183 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4184 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4185 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4186 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4189 switch (info->params.crc_type & HDLC_CRC_MASK)
4191 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4192 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4195 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4198 switch (info->params.preamble_length)
4200 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4201 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4202 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4205 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4208 wr_reg16(info, TCR, val);
4210 /* TPR (transmit preamble) */
4212 switch (info->params.preamble)
4214 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4215 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4216 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4217 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4218 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4219 default: val = 0x7e; break;
4221 wr_reg8(info, TPR, (unsigned char)val);
4225 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4229 * 07..03 reserved, must be 0
4232 * 00 auto-DCD enable
4236 switch(info->params.mode) {
4237 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4238 case MGSL_MODE_BISYNC: val |= BIT15; break;
4239 case MGSL_MODE_RAW: val |= BIT13; break;
4242 switch(info->params.encoding)
4244 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4245 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4246 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4247 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4248 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4249 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4250 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4253 switch (info->params.crc_type & HDLC_CRC_MASK)
4255 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4256 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4259 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4262 wr_reg16(info, RCR, val);
4264 /* CCR (clock control)
4266 * 07..05 tx clock source
4267 * 04..02 rx clock source
4273 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4275 // when RxC source is DPLL, BRG generates 16X DPLL
4276 // reference clock, so take TxC from BRG/16 to get
4277 // transmit clock at actual data rate
4278 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4279 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4281 val |= BIT6; /* 010, txclk = BRG */
4283 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4284 val |= BIT7; /* 100, txclk = DPLL Input */
4285 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4286 val |= BIT5; /* 001, txclk = RXC Input */
4288 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4289 val |= BIT3; /* 010, rxclk = BRG */
4290 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4291 val |= BIT4; /* 100, rxclk = DPLL */
4292 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4293 val |= BIT2; /* 001, rxclk = TXC Input */
4295 if (info->params.clock_speed)
4298 wr_reg8(info, CCR, (unsigned char)val);
4300 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4302 // program DPLL mode
4303 switch(info->params.encoding)
4305 case HDLC_ENCODING_BIPHASE_MARK:
4306 case HDLC_ENCODING_BIPHASE_SPACE:
4308 case HDLC_ENCODING_BIPHASE_LEVEL:
4309 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4310 val = BIT7 + BIT6; break;
4311 default: val = BIT6; // NRZ encodings
4313 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4315 // DPLL requires a 16X reference clock from BRG
4316 set_rate(info, info->params.clock_speed * 16);
4319 set_rate(info, info->params.clock_speed);
4325 /* SCR (serial control)
4327 * 15 1=tx req on FIFO half empty
4328 * 14 1=rx req on FIFO half full
4329 * 13 tx data IRQ enable
4330 * 12 tx idle IRQ enable
4331 * 11 underrun IRQ enable
4332 * 10 rx data IRQ enable
4333 * 09 rx idle IRQ enable
4334 * 08 overrun IRQ enable
4339 * 03 reserved, must be zero
4340 * 02 1=txd->rxd internal loopback enable
4341 * 01 reserved, must be zero
4342 * 00 1=master IRQ enable
4344 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4346 if (info->params.loopback)
4347 enable_loopback(info);
4351 * set transmit idle mode
4353 static void tx_set_idle(struct slgt_info *info)
4358 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4359 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4361 tcr = rd_reg16(info, TCR);
4362 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4363 /* disable preamble, set idle size to 16 bits */
4364 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4365 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4366 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4367 } else if (!(tcr & BIT6)) {
4368 /* preamble is disabled, set idle size to 8 bits */
4369 tcr &= ~(BIT5 + BIT4);
4371 wr_reg16(info, TCR, tcr);
4373 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4374 /* LSB of custom tx idle specified in tx idle register */
4375 val = (unsigned char)(info->idle_mode & 0xff);
4377 /* standard 8 bit idle patterns */
4378 switch(info->idle_mode)
4380 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4381 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4382 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4383 case HDLC_TXIDLE_ZEROS:
4384 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4385 default: val = 0xff;
4389 wr_reg8(info, TIR, val);
4393 * get state of V24 status (input) signals
4395 static void get_signals(struct slgt_info *info)
4397 unsigned short status = rd_reg16(info, SSR);
4399 /* clear all serial signals except DTR and RTS */
4400 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4403 info->signals |= SerialSignal_DSR;
4405 info->signals |= SerialSignal_CTS;
4407 info->signals |= SerialSignal_DCD;
4409 info->signals |= SerialSignal_RI;
4413 * set V.24 Control Register based on current configuration
4415 static void msc_set_vcr(struct slgt_info *info)
4417 unsigned char val = 0;
4419 /* VCR (V.24 control)
4421 * 07..04 serial IF select
4428 switch(info->if_mode & MGSL_INTERFACE_MASK)
4430 case MGSL_INTERFACE_RS232:
4431 val |= BIT5; /* 0010 */
4433 case MGSL_INTERFACE_V35:
4434 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4436 case MGSL_INTERFACE_RS422:
4437 val |= BIT6; /* 0100 */
4441 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4443 if (info->signals & SerialSignal_DTR)
4445 if (info->signals & SerialSignal_RTS)
4447 if (info->if_mode & MGSL_INTERFACE_LL)
4449 if (info->if_mode & MGSL_INTERFACE_RL)
4451 wr_reg8(info, VCR, val);
4455 * set state of V24 control (output) signals
4457 static void set_signals(struct slgt_info *info)
4459 unsigned char val = rd_reg8(info, VCR);
4460 if (info->signals & SerialSignal_DTR)
4464 if (info->signals & SerialSignal_RTS)
4468 wr_reg8(info, VCR, val);
4472 * free range of receive DMA buffers (i to last)
4474 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4479 /* reset current buffer for reuse */
4480 info->rbufs[i].status = 0;
4481 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4484 if (++i == info->rbuf_count)
4487 info->rbuf_current = i;
4491 * mark all receive DMA buffers as free
4493 static void reset_rbufs(struct slgt_info *info)
4495 free_rbufs(info, 0, info->rbuf_count - 1);
4499 * pass receive HDLC frame to upper layer
4501 * return true if frame available, otherwise false
4503 static bool rx_get_frame(struct slgt_info *info)
4505 unsigned int start, end;
4506 unsigned short status;
4507 unsigned int framesize = 0;
4508 unsigned long flags;
4509 struct tty_struct *tty = info->port.tty;
4510 unsigned char addr_field = 0xff;
4511 unsigned int crc_size = 0;
4513 switch (info->params.crc_type & HDLC_CRC_MASK) {
4514 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4515 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4522 start = end = info->rbuf_current;
4525 if (!desc_complete(info->rbufs[end]))
4528 if (framesize == 0 && info->params.addr_filter != 0xff)
4529 addr_field = info->rbufs[end].buf[0];
4531 framesize += desc_count(info->rbufs[end]);
4533 if (desc_eof(info->rbufs[end]))
4536 if (++end == info->rbuf_count)
4539 if (end == info->rbuf_current) {
4540 if (info->rx_enabled){
4541 spin_lock_irqsave(&info->lock,flags);
4543 spin_unlock_irqrestore(&info->lock,flags);
4551 * 15 buffer complete
4554 * 02 eof (end of frame)
4558 status = desc_status(info->rbufs[end]);
4560 /* ignore CRC bit if not using CRC (bit is undefined) */
4561 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4564 if (framesize == 0 ||
4565 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4566 free_rbufs(info, start, end);
4570 if (framesize < (2 + crc_size) || status & BIT0) {
4571 info->icount.rxshort++;
4573 } else if (status & BIT1) {
4574 info->icount.rxcrc++;
4575 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4579 #if SYNCLINK_GENERIC_HDLC
4580 if (framesize == 0) {
4581 info->netdev->stats.rx_errors++;
4582 info->netdev->stats.rx_frame_errors++;
4586 DBGBH(("%s rx frame status=%04X size=%d\n",
4587 info->device_name, status, framesize));
4588 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4591 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4592 framesize -= crc_size;
4596 if (framesize > info->max_frame_size + crc_size)
4597 info->icount.rxlong++;
4599 /* copy dma buffer(s) to contiguous temp buffer */
4600 int copy_count = framesize;
4602 unsigned char *p = info->tmp_rbuf;
4603 info->tmp_rbuf_count = framesize;
4605 info->icount.rxok++;
4608 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4609 memcpy(p, info->rbufs[i].buf, partial_count);
4611 copy_count -= partial_count;
4612 if (++i == info->rbuf_count)
4616 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4617 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4621 #if SYNCLINK_GENERIC_HDLC
4623 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4626 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4629 free_rbufs(info, start, end);
4637 * pass receive buffer (RAW synchronous mode) to tty layer
4638 * return true if buffer available, otherwise false
4640 static bool rx_get_buf(struct slgt_info *info)
4642 unsigned int i = info->rbuf_current;
4645 if (!desc_complete(info->rbufs[i]))
4647 count = desc_count(info->rbufs[i]);
4648 switch(info->params.mode) {
4649 case MGSL_MODE_MONOSYNC:
4650 case MGSL_MODE_BISYNC:
4651 /* ignore residue in byte synchronous modes */
4652 if (desc_residue(info->rbufs[i]))
4656 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4657 DBGINFO(("rx_get_buf size=%d\n", count));
4659 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4660 info->flag_buf, count);
4661 free_rbufs(info, i, i);
4665 static void reset_tbufs(struct slgt_info *info)
4668 info->tbuf_current = 0;
4669 for (i=0 ; i < info->tbuf_count ; i++) {
4670 info->tbufs[i].status = 0;
4671 info->tbufs[i].count = 0;
4676 * return number of free transmit DMA buffers
4678 static unsigned int free_tbuf_count(struct slgt_info *info)
4680 unsigned int count = 0;
4681 unsigned int i = info->tbuf_current;
4685 if (desc_count(info->tbufs[i]))
4686 break; /* buffer in use */
4688 if (++i == info->tbuf_count)
4690 } while (i != info->tbuf_current);
4692 /* if tx DMA active, last zero count buffer is in use */
4693 if (count && (rd_reg32(info, TDCSR) & BIT0))
4700 * return number of bytes in unsent transmit DMA buffers
4701 * and the serial controller tx FIFO
4703 static unsigned int tbuf_bytes(struct slgt_info *info)
4705 unsigned int total_count = 0;
4706 unsigned int i = info->tbuf_current;
4707 unsigned int reg_value;
4709 unsigned int active_buf_count = 0;
4712 * Add descriptor counts for all tx DMA buffers.
4713 * If count is zero (cleared by DMA controller after read),
4714 * the buffer is complete or is actively being read from.
4716 * Record buf_count of last buffer with zero count starting
4717 * from current ring position. buf_count is mirror
4718 * copy of count and is not cleared by serial controller.
4719 * If DMA controller is active, that buffer is actively
4720 * being read so add to total.
4723 count = desc_count(info->tbufs[i]);
4725 total_count += count;
4726 else if (!total_count)
4727 active_buf_count = info->tbufs[i].buf_count;
4728 if (++i == info->tbuf_count)
4730 } while (i != info->tbuf_current);
4732 /* read tx DMA status register */
4733 reg_value = rd_reg32(info, TDCSR);
4735 /* if tx DMA active, last zero count buffer is in use */
4736 if (reg_value & BIT0)
4737 total_count += active_buf_count;
4739 /* add tx FIFO count = reg_value[15..8] */
4740 total_count += (reg_value >> 8) & 0xff;
4742 /* if transmitter active add one byte for shift register */
4743 if (info->tx_active)
4750 * load transmit DMA buffer(s) with data
4752 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4754 unsigned short count;
4756 struct slgt_desc *d;
4761 DBGDATA(info, buf, size, "tx");
4763 info->tbuf_start = i = info->tbuf_current;
4766 d = &info->tbufs[i];
4767 if (++i == info->tbuf_count)
4770 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4771 memcpy(d->buf, buf, count);
4777 * set EOF bit for last buffer of HDLC frame or
4778 * for every buffer in raw mode
4780 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4781 info->params.mode == MGSL_MODE_RAW)
4782 set_desc_eof(*d, 1);
4784 set_desc_eof(*d, 0);
4786 set_desc_count(*d, count);
4787 d->buf_count = count;
4790 info->tbuf_current = i;
4793 static int register_test(struct slgt_info *info)
4795 static unsigned short patterns[] =
4796 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4797 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4801 for (i=0 ; i < count ; i++) {
4802 wr_reg16(info, TIR, patterns[i]);
4803 wr_reg16(info, BDR, patterns[(i+1)%count]);
4804 if ((rd_reg16(info, TIR) != patterns[i]) ||
4805 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4810 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4811 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4815 static int irq_test(struct slgt_info *info)
4817 unsigned long timeout;
4818 unsigned long flags;
4819 struct tty_struct *oldtty = info->port.tty;
4820 u32 speed = info->params.data_rate;
4822 info->params.data_rate = 921600;
4823 info->port.tty = NULL;
4825 spin_lock_irqsave(&info->lock, flags);
4827 slgt_irq_on(info, IRQ_TXIDLE);
4829 /* enable transmitter */
4831 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4833 /* write one byte and wait for tx idle */
4834 wr_reg16(info, TDR, 0);
4836 /* assume failure */
4837 info->init_error = DiagStatus_IrqFailure;
4838 info->irq_occurred = false;
4840 spin_unlock_irqrestore(&info->lock, flags);
4843 while(timeout-- && !info->irq_occurred)
4844 msleep_interruptible(10);
4846 spin_lock_irqsave(&info->lock,flags);
4848 spin_unlock_irqrestore(&info->lock,flags);
4850 info->params.data_rate = speed;
4851 info->port.tty = oldtty;
4853 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4854 return info->irq_occurred ? 0 : -ENODEV;
4857 static int loopback_test_rx(struct slgt_info *info)
4859 unsigned char *src, *dest;
4862 if (desc_complete(info->rbufs[0])) {
4863 count = desc_count(info->rbufs[0]);
4864 src = info->rbufs[0].buf;
4865 dest = info->tmp_rbuf;
4867 for( ; count ; count-=2, src+=2) {
4868 /* src=data byte (src+1)=status byte */
4869 if (!(*(src+1) & (BIT9 + BIT8))) {
4872 info->tmp_rbuf_count++;
4875 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4881 static int loopback_test(struct slgt_info *info)
4883 #define TESTFRAMESIZE 20
4885 unsigned long timeout;
4886 u16 count = TESTFRAMESIZE;
4887 unsigned char buf[TESTFRAMESIZE];
4889 unsigned long flags;
4891 struct tty_struct *oldtty = info->port.tty;
4894 memcpy(¶ms, &info->params, sizeof(params));
4896 info->params.mode = MGSL_MODE_ASYNC;
4897 info->params.data_rate = 921600;
4898 info->params.loopback = 1;
4899 info->port.tty = NULL;
4901 /* build and send transmit frame */
4902 for (count = 0; count < TESTFRAMESIZE; ++count)
4903 buf[count] = (unsigned char)count;
4905 info->tmp_rbuf_count = 0;
4906 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4908 /* program hardware for HDLC and enabled receiver */
4909 spin_lock_irqsave(&info->lock,flags);
4912 info->tx_count = count;
4913 tx_load(info, buf, count);
4915 spin_unlock_irqrestore(&info->lock, flags);
4917 /* wait for receive complete */
4918 for (timeout = 100; timeout; --timeout) {
4919 msleep_interruptible(10);
4920 if (loopback_test_rx(info)) {
4926 /* verify received frame length and contents */
4927 if (!rc && (info->tmp_rbuf_count != count ||
4928 memcmp(buf, info->tmp_rbuf, count))) {
4932 spin_lock_irqsave(&info->lock,flags);
4933 reset_adapter(info);
4934 spin_unlock_irqrestore(&info->lock,flags);
4936 memcpy(&info->params, ¶ms, sizeof(info->params));
4937 info->port.tty = oldtty;
4939 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4943 static int adapter_test(struct slgt_info *info)
4945 DBGINFO(("testing %s\n", info->device_name));
4946 if (register_test(info) < 0) {
4947 printk("register test failure %s addr=%08X\n",
4948 info->device_name, info->phys_reg_addr);
4949 } else if (irq_test(info) < 0) {
4950 printk("IRQ test failure %s IRQ=%d\n",
4951 info->device_name, info->irq_level);
4952 } else if (loopback_test(info) < 0) {
4953 printk("loopback test failure %s\n", info->device_name);
4955 return info->init_error;
4959 * transmit timeout handler
4961 static void tx_timeout(unsigned long context)
4963 struct slgt_info *info = (struct slgt_info*)context;
4964 unsigned long flags;
4966 DBGINFO(("%s tx_timeout\n", info->device_name));
4967 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4968 info->icount.txtimeout++;
4970 spin_lock_irqsave(&info->lock,flags);
4971 info->tx_active = false;
4973 spin_unlock_irqrestore(&info->lock,flags);
4975 #if SYNCLINK_GENERIC_HDLC
4977 hdlcdev_tx_done(info);
4984 * receive buffer polling timer
4986 static void rx_timeout(unsigned long context)
4988 struct slgt_info *info = (struct slgt_info*)context;
4989 unsigned long flags;
4991 DBGINFO(("%s rx_timeout\n", info->device_name));
4992 spin_lock_irqsave(&info->lock, flags);
4993 info->pending_bh |= BH_RECEIVE;
4994 spin_unlock_irqrestore(&info->lock, flags);
4995 bh_handler(&info->task);