Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-serial
[pandora-kernel.git] / drivers / char / synclink.c
1 /*
2  * linux/drivers/char/synclink.c
3  *
4  * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
5  *
6  * Device driver for Microgate SyncLink ISA and PCI
7  * high speed multiprotocol serial adapters.
8  *
9  * written by Paul Fulghum for Microgate Corporation
10  * paulkf@microgate.com
11  *
12  * Microgate and SyncLink are trademarks of Microgate Corporation
13  *
14  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
15  *
16  * Original release 01/11/99
17  *
18  * This code is released under the GNU General Public License (GPL)
19  *
20  * This driver is primarily intended for use in synchronous
21  * HDLC mode. Asynchronous mode is also provided.
22  *
23  * When operating in synchronous mode, each call to mgsl_write()
24  * contains exactly one complete HDLC frame. Calling mgsl_put_char
25  * will start assembling an HDLC frame that will not be sent until
26  * mgsl_flush_chars or mgsl_write is called.
27  * 
28  * Synchronous receive data is reported as complete frames. To accomplish
29  * this, the TTY flip buffer is bypassed (too small to hold largest
30  * frame and may fragment frames) and the line discipline
31  * receive entry point is called directly.
32  *
33  * This driver has been tested with a slightly modified ppp.c driver
34  * for synchronous PPP.
35  *
36  * 2000/02/16
37  * Added interface for syncppp.c driver (an alternate synchronous PPP
38  * implementation that also supports Cisco HDLC). Each device instance
39  * registers as a tty device AND a network device (if dosyncppp option
40  * is set for the device). The functionality is determined by which
41  * device interface is opened.
42  *
43  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
44  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
47  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
48  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
49  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53  * OF THE POSSIBILITY OF SUCH DAMAGE.
54  */
55
56 #if defined(__i386__)
57 #  define BREAKPOINT() asm("   int $3");
58 #else
59 #  define BREAKPOINT() { }
60 #endif
61
62 #define MAX_ISA_DEVICES 10
63 #define MAX_PCI_DEVICES 10
64 #define MAX_TOTAL_DEVICES 20
65
66 #include <linux/config.h>       
67 #include <linux/module.h>
68 #include <linux/errno.h>
69 #include <linux/signal.h>
70 #include <linux/sched.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/pci.h>
74 #include <linux/tty.h>
75 #include <linux/tty_flip.h>
76 #include <linux/serial.h>
77 #include <linux/major.h>
78 #include <linux/string.h>
79 #include <linux/fcntl.h>
80 #include <linux/ptrace.h>
81 #include <linux/ioport.h>
82 #include <linux/mm.h>
83 #include <linux/slab.h>
84 #include <linux/delay.h>
85
86 #include <linux/netdevice.h>
87
88 #include <linux/vmalloc.h>
89 #include <linux/init.h>
90
91 #include <linux/delay.h>
92 #include <linux/ioctl.h>
93
94 #include <asm/system.h>
95 #include <asm/io.h>
96 #include <asm/irq.h>
97 #include <asm/dma.h>
98 #include <linux/bitops.h>
99 #include <asm/types.h>
100 #include <linux/termios.h>
101 #include <linux/workqueue.h>
102 #include <linux/hdlc.h>
103 #include <linux/dma-mapping.h>
104
105 #ifdef CONFIG_HDLC_MODULE
106 #define CONFIG_HDLC 1
107 #endif
108
109 #define GET_USER(error,value,addr) error = get_user(value,addr)
110 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
111 #define PUT_USER(error,value,addr) error = put_user(value,addr)
112 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
113
114 #include <asm/uaccess.h>
115
116 #include "linux/synclink.h"
117
118 #define RCLRVALUE 0xffff
119
120 static MGSL_PARAMS default_params = {
121         MGSL_MODE_HDLC,                 /* unsigned long mode */
122         0,                              /* unsigned char loopback; */
123         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
124         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
125         0,                              /* unsigned long clock_speed; */
126         0xff,                           /* unsigned char addr_filter; */
127         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
128         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
129         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
130         9600,                           /* unsigned long data_rate; */
131         8,                              /* unsigned char data_bits; */
132         1,                              /* unsigned char stop_bits; */
133         ASYNC_PARITY_NONE               /* unsigned char parity; */
134 };
135
136 #define SHARED_MEM_ADDRESS_SIZE 0x40000
137 #define BUFFERLISTSIZE (PAGE_SIZE)
138 #define DMABUFFERSIZE (PAGE_SIZE)
139 #define MAXRXFRAMES 7
140
141 typedef struct _DMABUFFERENTRY
142 {
143         u32 phys_addr;  /* 32-bit flat physical address of data buffer */
144         volatile u16 count;     /* buffer size/data count */
145         volatile u16 status;    /* Control/status field */
146         volatile u16 rcc;       /* character count field */
147         u16 reserved;   /* padding required by 16C32 */
148         u32 link;       /* 32-bit flat link to next buffer entry */
149         char *virt_addr;        /* virtual address of data buffer */
150         u32 phys_entry; /* physical address of this buffer entry */
151         dma_addr_t dma_addr;
152 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
153
154 /* The queue of BH actions to be performed */
155
156 #define BH_RECEIVE  1
157 #define BH_TRANSMIT 2
158 #define BH_STATUS   4
159
160 #define IO_PIN_SHUTDOWN_LIMIT 100
161
162 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
163
164 struct  _input_signal_events {
165         int     ri_up;  
166         int     ri_down;
167         int     dsr_up;
168         int     dsr_down;
169         int     dcd_up;
170         int     dcd_down;
171         int     cts_up;
172         int     cts_down;
173 };
174
175 /* transmit holding buffer definitions*/
176 #define MAX_TX_HOLDING_BUFFERS 5
177 struct tx_holding_buffer {
178         int     buffer_size;
179         unsigned char * buffer;
180 };
181
182
183 /*
184  * Device instance data structure
185  */
186  
187 struct mgsl_struct {
188         int                     magic;
189         int                     flags;
190         int                     count;          /* count of opens */
191         int                     line;
192         int                     hw_version;
193         unsigned short          close_delay;
194         unsigned short          closing_wait;   /* time to wait before closing */
195         
196         struct mgsl_icount      icount;
197         
198         struct tty_struct       *tty;
199         int                     timeout;
200         int                     x_char;         /* xon/xoff character */
201         int                     blocked_open;   /* # of blocked opens */
202         u16                     read_status_mask;
203         u16                     ignore_status_mask;     
204         unsigned char           *xmit_buf;
205         int                     xmit_head;
206         int                     xmit_tail;
207         int                     xmit_cnt;
208         
209         wait_queue_head_t       open_wait;
210         wait_queue_head_t       close_wait;
211         
212         wait_queue_head_t       status_event_wait_q;
213         wait_queue_head_t       event_wait_q;
214         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
215         struct mgsl_struct      *next_device;   /* device list link */
216         
217         spinlock_t irq_spinlock;                /* spinlock for synchronizing with ISR */
218         struct work_struct task;                /* task structure for scheduling bh */
219
220         u32 EventMask;                  /* event trigger mask */
221         u32 RecordedEvents;             /* pending events */
222
223         u32 max_frame_size;             /* as set by device config */
224
225         u32 pending_bh;
226
227         int bh_running;         /* Protection from multiple */
228         int isr_overflow;
229         int bh_requested;
230         
231         int dcd_chkcount;               /* check counts to prevent */
232         int cts_chkcount;               /* too many IRQs if a signal */
233         int dsr_chkcount;               /* is floating */
234         int ri_chkcount;
235
236         char *buffer_list;              /* virtual address of Rx & Tx buffer lists */
237         u32 buffer_list_phys;
238         dma_addr_t buffer_list_dma_addr;
239
240         unsigned int rx_buffer_count;   /* count of total allocated Rx buffers */
241         DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
242         unsigned int current_rx_buffer;
243
244         int num_tx_dma_buffers;         /* number of tx dma frames required */
245         int tx_dma_buffers_used;
246         unsigned int tx_buffer_count;   /* count of total allocated Tx buffers */
247         DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
248         int start_tx_dma_buffer;        /* tx dma buffer to start tx dma operation */
249         int current_tx_buffer;          /* next tx dma buffer to be loaded */
250         
251         unsigned char *intermediate_rxbuffer;
252
253         int num_tx_holding_buffers;     /* number of tx holding buffer allocated */
254         int get_tx_holding_index;       /* next tx holding buffer for adapter to load */
255         int put_tx_holding_index;       /* next tx holding buffer to store user request */
256         int tx_holding_count;           /* number of tx holding buffers waiting */
257         struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
258
259         int rx_enabled;
260         int rx_overflow;
261         int rx_rcc_underrun;
262
263         int tx_enabled;
264         int tx_active;
265         u32 idle_mode;
266
267         u16 cmr_value;
268         u16 tcsr_value;
269
270         char device_name[25];           /* device instance name */
271
272         unsigned int bus_type;  /* expansion bus type (ISA,EISA,PCI) */
273         unsigned char bus;              /* expansion bus number (zero based) */
274         unsigned char function;         /* PCI device number */
275
276         unsigned int io_base;           /* base I/O address of adapter */
277         unsigned int io_addr_size;      /* size of the I/O address range */
278         int io_addr_requested;          /* nonzero if I/O address requested */
279         
280         unsigned int irq_level;         /* interrupt level */
281         unsigned long irq_flags;
282         int irq_requested;              /* nonzero if IRQ requested */
283         
284         unsigned int dma_level;         /* DMA channel */
285         int dma_requested;              /* nonzero if dma channel requested */
286
287         u16 mbre_bit;
288         u16 loopback_bits;
289         u16 usc_idle_mode;
290
291         MGSL_PARAMS params;             /* communications parameters */
292
293         unsigned char serial_signals;   /* current serial signal states */
294
295         int irq_occurred;               /* for diagnostics use */
296         unsigned int init_error;        /* Initialization startup error                 (DIAGS) */
297         int     fDiagnosticsmode;       /* Driver in Diagnostic mode?                   (DIAGS) */
298
299         u32 last_mem_alloc;
300         unsigned char* memory_base;     /* shared memory address (PCI only) */
301         u32 phys_memory_base;
302         int shared_mem_requested;
303
304         unsigned char* lcr_base;        /* local config registers (PCI only) */
305         u32 phys_lcr_base;
306         u32 lcr_offset;
307         int lcr_mem_requested;
308
309         u32 misc_ctrl_value;
310         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
311         char char_buf[MAX_ASYNC_BUFFER_SIZE];   
312         BOOLEAN drop_rts_on_tx_done;
313
314         BOOLEAN loopmode_insert_requested;
315         BOOLEAN loopmode_send_done_requested;
316         
317         struct  _input_signal_events    input_signal_events;
318
319         /* generic HDLC device parts */
320         int netcount;
321         int dosyncppp;
322         spinlock_t netlock;
323
324 #ifdef CONFIG_HDLC
325         struct net_device *netdev;
326 #endif
327 };
328
329 #define MGSL_MAGIC 0x5401
330
331 /*
332  * The size of the serial xmit buffer is 1 page, or 4096 bytes
333  */
334 #ifndef SERIAL_XMIT_SIZE
335 #define SERIAL_XMIT_SIZE 4096
336 #endif
337
338 /*
339  * These macros define the offsets used in calculating the
340  * I/O address of the specified USC registers.
341  */
342
343
344 #define DCPIN 2         /* Bit 1 of I/O address */
345 #define SDPIN 4         /* Bit 2 of I/O address */
346
347 #define DCAR 0          /* DMA command/address register */
348 #define CCAR SDPIN              /* channel command/address register */
349 #define DATAREG DCPIN + SDPIN   /* serial data register */
350 #define MSBONLY 0x41
351 #define LSBONLY 0x40
352
353 /*
354  * These macros define the register address (ordinal number)
355  * used for writing address/value pairs to the USC.
356  */
357
358 #define CMR     0x02    /* Channel mode Register */
359 #define CCSR    0x04    /* Channel Command/status Register */
360 #define CCR     0x06    /* Channel Control Register */
361 #define PSR     0x08    /* Port status Register */
362 #define PCR     0x0a    /* Port Control Register */
363 #define TMDR    0x0c    /* Test mode Data Register */
364 #define TMCR    0x0e    /* Test mode Control Register */
365 #define CMCR    0x10    /* Clock mode Control Register */
366 #define HCR     0x12    /* Hardware Configuration Register */
367 #define IVR     0x14    /* Interrupt Vector Register */
368 #define IOCR    0x16    /* Input/Output Control Register */
369 #define ICR     0x18    /* Interrupt Control Register */
370 #define DCCR    0x1a    /* Daisy Chain Control Register */
371 #define MISR    0x1c    /* Misc Interrupt status Register */
372 #define SICR    0x1e    /* status Interrupt Control Register */
373 #define RDR     0x20    /* Receive Data Register */
374 #define RMR     0x22    /* Receive mode Register */
375 #define RCSR    0x24    /* Receive Command/status Register */
376 #define RICR    0x26    /* Receive Interrupt Control Register */
377 #define RSR     0x28    /* Receive Sync Register */
378 #define RCLR    0x2a    /* Receive count Limit Register */
379 #define RCCR    0x2c    /* Receive Character count Register */
380 #define TC0R    0x2e    /* Time Constant 0 Register */
381 #define TDR     0x30    /* Transmit Data Register */
382 #define TMR     0x32    /* Transmit mode Register */
383 #define TCSR    0x34    /* Transmit Command/status Register */
384 #define TICR    0x36    /* Transmit Interrupt Control Register */
385 #define TSR     0x38    /* Transmit Sync Register */
386 #define TCLR    0x3a    /* Transmit count Limit Register */
387 #define TCCR    0x3c    /* Transmit Character count Register */
388 #define TC1R    0x3e    /* Time Constant 1 Register */
389
390
391 /*
392  * MACRO DEFINITIONS FOR DMA REGISTERS
393  */
394
395 #define DCR     0x06    /* DMA Control Register (shared) */
396 #define DACR    0x08    /* DMA Array count Register (shared) */
397 #define BDCR    0x12    /* Burst/Dwell Control Register (shared) */
398 #define DIVR    0x14    /* DMA Interrupt Vector Register (shared) */    
399 #define DICR    0x18    /* DMA Interrupt Control Register (shared) */
400 #define CDIR    0x1a    /* Clear DMA Interrupt Register (shared) */
401 #define SDIR    0x1c    /* Set DMA Interrupt Register (shared) */
402
403 #define TDMR    0x02    /* Transmit DMA mode Register */
404 #define TDIAR   0x1e    /* Transmit DMA Interrupt Arm Register */
405 #define TBCR    0x2a    /* Transmit Byte count Register */
406 #define TARL    0x2c    /* Transmit Address Register (low) */
407 #define TARU    0x2e    /* Transmit Address Register (high) */
408 #define NTBCR   0x3a    /* Next Transmit Byte count Register */
409 #define NTARL   0x3c    /* Next Transmit Address Register (low) */
410 #define NTARU   0x3e    /* Next Transmit Address Register (high) */
411
412 #define RDMR    0x82    /* Receive DMA mode Register (non-shared) */
413 #define RDIAR   0x9e    /* Receive DMA Interrupt Arm Register */
414 #define RBCR    0xaa    /* Receive Byte count Register */
415 #define RARL    0xac    /* Receive Address Register (low) */
416 #define RARU    0xae    /* Receive Address Register (high) */
417 #define NRBCR   0xba    /* Next Receive Byte count Register */
418 #define NRARL   0xbc    /* Next Receive Address Register (low) */
419 #define NRARU   0xbe    /* Next Receive Address Register (high) */
420
421
422 /*
423  * MACRO DEFINITIONS FOR MODEM STATUS BITS
424  */
425
426 #define MODEMSTATUS_DTR 0x80
427 #define MODEMSTATUS_DSR 0x40
428 #define MODEMSTATUS_RTS 0x20
429 #define MODEMSTATUS_CTS 0x10
430 #define MODEMSTATUS_RI  0x04
431 #define MODEMSTATUS_DCD 0x01
432
433
434 /*
435  * Channel Command/Address Register (CCAR) Command Codes
436  */
437
438 #define RTCmd_Null                      0x0000
439 #define RTCmd_ResetHighestIus           0x1000
440 #define RTCmd_TriggerChannelLoadDma     0x2000
441 #define RTCmd_TriggerRxDma              0x2800
442 #define RTCmd_TriggerTxDma              0x3000
443 #define RTCmd_TriggerRxAndTxDma         0x3800
444 #define RTCmd_PurgeRxFifo               0x4800
445 #define RTCmd_PurgeTxFifo               0x5000
446 #define RTCmd_PurgeRxAndTxFifo          0x5800
447 #define RTCmd_LoadRcc                   0x6800
448 #define RTCmd_LoadTcc                   0x7000
449 #define RTCmd_LoadRccAndTcc             0x7800
450 #define RTCmd_LoadTC0                   0x8800
451 #define RTCmd_LoadTC1                   0x9000
452 #define RTCmd_LoadTC0AndTC1             0x9800
453 #define RTCmd_SerialDataLSBFirst        0xa000
454 #define RTCmd_SerialDataMSBFirst        0xa800
455 #define RTCmd_SelectBigEndian           0xb000
456 #define RTCmd_SelectLittleEndian        0xb800
457
458
459 /*
460  * DMA Command/Address Register (DCAR) Command Codes
461  */
462
463 #define DmaCmd_Null                     0x0000
464 #define DmaCmd_ResetTxChannel           0x1000
465 #define DmaCmd_ResetRxChannel           0x1200
466 #define DmaCmd_StartTxChannel           0x2000
467 #define DmaCmd_StartRxChannel           0x2200
468 #define DmaCmd_ContinueTxChannel        0x3000
469 #define DmaCmd_ContinueRxChannel        0x3200
470 #define DmaCmd_PauseTxChannel           0x4000
471 #define DmaCmd_PauseRxChannel           0x4200
472 #define DmaCmd_AbortTxChannel           0x5000
473 #define DmaCmd_AbortRxChannel           0x5200
474 #define DmaCmd_InitTxChannel            0x7000
475 #define DmaCmd_InitRxChannel            0x7200
476 #define DmaCmd_ResetHighestDmaIus       0x8000
477 #define DmaCmd_ResetAllChannels         0x9000
478 #define DmaCmd_StartAllChannels         0xa000
479 #define DmaCmd_ContinueAllChannels      0xb000
480 #define DmaCmd_PauseAllChannels         0xc000
481 #define DmaCmd_AbortAllChannels         0xd000
482 #define DmaCmd_InitAllChannels          0xf000
483
484 #define TCmd_Null                       0x0000
485 #define TCmd_ClearTxCRC                 0x2000
486 #define TCmd_SelectTicrTtsaData         0x4000
487 #define TCmd_SelectTicrTxFifostatus     0x5000
488 #define TCmd_SelectTicrIntLevel         0x6000
489 #define TCmd_SelectTicrdma_level                0x7000
490 #define TCmd_SendFrame                  0x8000
491 #define TCmd_SendAbort                  0x9000
492 #define TCmd_EnableDleInsertion         0xc000
493 #define TCmd_DisableDleInsertion        0xd000
494 #define TCmd_ClearEofEom                0xe000
495 #define TCmd_SetEofEom                  0xf000
496
497 #define RCmd_Null                       0x0000
498 #define RCmd_ClearRxCRC                 0x2000
499 #define RCmd_EnterHuntmode              0x3000
500 #define RCmd_SelectRicrRtsaData         0x4000
501 #define RCmd_SelectRicrRxFifostatus     0x5000
502 #define RCmd_SelectRicrIntLevel         0x6000
503 #define RCmd_SelectRicrdma_level                0x7000
504
505 /*
506  * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
507  */
508  
509 #define RECEIVE_STATUS          BIT5
510 #define RECEIVE_DATA            BIT4
511 #define TRANSMIT_STATUS         BIT3
512 #define TRANSMIT_DATA           BIT2
513 #define IO_PIN                  BIT1
514 #define MISC                    BIT0
515
516
517 /*
518  * Receive status Bits in Receive Command/status Register RCSR
519  */
520
521 #define RXSTATUS_SHORT_FRAME            BIT8
522 #define RXSTATUS_CODE_VIOLATION         BIT8
523 #define RXSTATUS_EXITED_HUNT            BIT7
524 #define RXSTATUS_IDLE_RECEIVED          BIT6
525 #define RXSTATUS_BREAK_RECEIVED         BIT5
526 #define RXSTATUS_ABORT_RECEIVED         BIT5
527 #define RXSTATUS_RXBOUND                BIT4
528 #define RXSTATUS_CRC_ERROR              BIT3
529 #define RXSTATUS_FRAMING_ERROR          BIT3
530 #define RXSTATUS_ABORT                  BIT2
531 #define RXSTATUS_PARITY_ERROR           BIT2
532 #define RXSTATUS_OVERRUN                BIT1
533 #define RXSTATUS_DATA_AVAILABLE         BIT0
534 #define RXSTATUS_ALL                    0x01f6
535 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
536
537 /*
538  * Values for setting transmit idle mode in 
539  * Transmit Control/status Register (TCSR)
540  */
541 #define IDLEMODE_FLAGS                  0x0000
542 #define IDLEMODE_ALT_ONE_ZERO           0x0100
543 #define IDLEMODE_ZERO                   0x0200
544 #define IDLEMODE_ONE                    0x0300
545 #define IDLEMODE_ALT_MARK_SPACE         0x0500
546 #define IDLEMODE_SPACE                  0x0600
547 #define IDLEMODE_MARK                   0x0700
548 #define IDLEMODE_MASK                   0x0700
549
550 /*
551  * IUSC revision identifiers
552  */
553 #define IUSC_SL1660                     0x4d44
554 #define IUSC_PRE_SL1660                 0x4553
555
556 /*
557  * Transmit status Bits in Transmit Command/status Register (TCSR)
558  */
559
560 #define TCSR_PRESERVE                   0x0F00
561
562 #define TCSR_UNDERWAIT                  BIT11
563 #define TXSTATUS_PREAMBLE_SENT          BIT7
564 #define TXSTATUS_IDLE_SENT              BIT6
565 #define TXSTATUS_ABORT_SENT             BIT5
566 #define TXSTATUS_EOF_SENT               BIT4
567 #define TXSTATUS_EOM_SENT               BIT4
568 #define TXSTATUS_CRC_SENT               BIT3
569 #define TXSTATUS_ALL_SENT               BIT2
570 #define TXSTATUS_UNDERRUN               BIT1
571 #define TXSTATUS_FIFO_EMPTY             BIT0
572 #define TXSTATUS_ALL                    0x00fa
573 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
574                                 
575
576 #define MISCSTATUS_RXC_LATCHED          BIT15
577 #define MISCSTATUS_RXC                  BIT14
578 #define MISCSTATUS_TXC_LATCHED          BIT13
579 #define MISCSTATUS_TXC                  BIT12
580 #define MISCSTATUS_RI_LATCHED           BIT11
581 #define MISCSTATUS_RI                   BIT10
582 #define MISCSTATUS_DSR_LATCHED          BIT9
583 #define MISCSTATUS_DSR                  BIT8
584 #define MISCSTATUS_DCD_LATCHED          BIT7
585 #define MISCSTATUS_DCD                  BIT6
586 #define MISCSTATUS_CTS_LATCHED          BIT5
587 #define MISCSTATUS_CTS                  BIT4
588 #define MISCSTATUS_RCC_UNDERRUN         BIT3
589 #define MISCSTATUS_DPLL_NO_SYNC         BIT2
590 #define MISCSTATUS_BRG1_ZERO            BIT1
591 #define MISCSTATUS_BRG0_ZERO            BIT0
592
593 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
594 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
595
596 #define SICR_RXC_ACTIVE                 BIT15
597 #define SICR_RXC_INACTIVE               BIT14
598 #define SICR_RXC                        (BIT15+BIT14)
599 #define SICR_TXC_ACTIVE                 BIT13
600 #define SICR_TXC_INACTIVE               BIT12
601 #define SICR_TXC                        (BIT13+BIT12)
602 #define SICR_RI_ACTIVE                  BIT11
603 #define SICR_RI_INACTIVE                BIT10
604 #define SICR_RI                         (BIT11+BIT10)
605 #define SICR_DSR_ACTIVE                 BIT9
606 #define SICR_DSR_INACTIVE               BIT8
607 #define SICR_DSR                        (BIT9+BIT8)
608 #define SICR_DCD_ACTIVE                 BIT7
609 #define SICR_DCD_INACTIVE               BIT6
610 #define SICR_DCD                        (BIT7+BIT6)
611 #define SICR_CTS_ACTIVE                 BIT5
612 #define SICR_CTS_INACTIVE               BIT4
613 #define SICR_CTS                        (BIT5+BIT4)
614 #define SICR_RCC_UNDERFLOW              BIT3
615 #define SICR_DPLL_NO_SYNC               BIT2
616 #define SICR_BRG1_ZERO                  BIT1
617 #define SICR_BRG0_ZERO                  BIT0
618
619 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
620 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
621 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
622 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
623 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
624
625 #define usc_EnableInterrupts( a, b ) \
626         usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
627
628 #define usc_DisableInterrupts( a, b ) \
629         usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
630
631 #define usc_EnableMasterIrqBit(a) \
632         usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
633
634 #define usc_DisableMasterIrqBit(a) \
635         usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
636
637 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
638
639 /*
640  * Transmit status Bits in Transmit Control status Register (TCSR)
641  * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
642  */
643
644 #define TXSTATUS_PREAMBLE_SENT  BIT7
645 #define TXSTATUS_IDLE_SENT      BIT6
646 #define TXSTATUS_ABORT_SENT     BIT5
647 #define TXSTATUS_EOF            BIT4
648 #define TXSTATUS_CRC_SENT       BIT3
649 #define TXSTATUS_ALL_SENT       BIT2
650 #define TXSTATUS_UNDERRUN       BIT1
651 #define TXSTATUS_FIFO_EMPTY     BIT0
652
653 #define DICR_MASTER             BIT15
654 #define DICR_TRANSMIT           BIT0
655 #define DICR_RECEIVE            BIT1
656
657 #define usc_EnableDmaInterrupts(a,b) \
658         usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
659
660 #define usc_DisableDmaInterrupts(a,b) \
661         usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
662
663 #define usc_EnableStatusIrqs(a,b) \
664         usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
665
666 #define usc_DisablestatusIrqs(a,b) \
667         usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
668
669 /* Transmit status Bits in Transmit Control status Register (TCSR) */
670 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
671
672
673 #define DISABLE_UNCONDITIONAL    0
674 #define DISABLE_END_OF_FRAME     1
675 #define ENABLE_UNCONDITIONAL     2
676 #define ENABLE_AUTO_CTS          3
677 #define ENABLE_AUTO_DCD          3
678 #define usc_EnableTransmitter(a,b) \
679         usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
680 #define usc_EnableReceiver(a,b) \
681         usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
682
683 static u16  usc_InDmaReg( struct mgsl_struct *info, u16 Port );
684 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
685 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
686
687 static u16  usc_InReg( struct mgsl_struct *info, u16 Port );
688 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
689 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
690 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
691 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
692
693 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
694 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
695
696 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
697
698 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
699 static void usc_start_receiver( struct mgsl_struct *info );
700 static void usc_stop_receiver( struct mgsl_struct *info );
701
702 static void usc_start_transmitter( struct mgsl_struct *info );
703 static void usc_stop_transmitter( struct mgsl_struct *info );
704 static void usc_set_txidle( struct mgsl_struct *info );
705 static void usc_load_txfifo( struct mgsl_struct *info );
706
707 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
708 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
709
710 static void usc_get_serial_signals( struct mgsl_struct *info );
711 static void usc_set_serial_signals( struct mgsl_struct *info );
712
713 static void usc_reset( struct mgsl_struct *info );
714
715 static void usc_set_sync_mode( struct mgsl_struct *info );
716 static void usc_set_sdlc_mode( struct mgsl_struct *info );
717 static void usc_set_async_mode( struct mgsl_struct *info );
718 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
719
720 static void usc_loopback_frame( struct mgsl_struct *info );
721
722 static void mgsl_tx_timeout(unsigned long context);
723
724
725 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
726 static void usc_loopmode_insert_request( struct mgsl_struct * info );
727 static int usc_loopmode_active( struct mgsl_struct * info);
728 static void usc_loopmode_send_done( struct mgsl_struct * info );
729
730 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
731
732 #ifdef CONFIG_HDLC
733 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
734 static void hdlcdev_tx_done(struct mgsl_struct *info);
735 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
736 static int  hdlcdev_init(struct mgsl_struct *info);
737 static void hdlcdev_exit(struct mgsl_struct *info);
738 #endif
739
740 /*
741  * Defines a BUS descriptor value for the PCI adapter
742  * local bus address ranges.
743  */
744
745 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
746 (0x00400020 + \
747 ((WrHold) << 30) + \
748 ((WrDly)  << 28) + \
749 ((RdDly)  << 26) + \
750 ((Nwdd)   << 20) + \
751 ((Nwad)   << 15) + \
752 ((Nxda)   << 13) + \
753 ((Nrdd)   << 11) + \
754 ((Nrad)   <<  6) )
755
756 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
757
758 /*
759  * Adapter diagnostic routines
760  */
761 static BOOLEAN mgsl_register_test( struct mgsl_struct *info );
762 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info );
763 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info );
764 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info );
765 static int mgsl_adapter_test( struct mgsl_struct *info );
766
767 /*
768  * device and resource management routines
769  */
770 static int mgsl_claim_resources(struct mgsl_struct *info);
771 static void mgsl_release_resources(struct mgsl_struct *info);
772 static void mgsl_add_device(struct mgsl_struct *info);
773 static struct mgsl_struct* mgsl_allocate_device(void);
774
775 /*
776  * DMA buffer manupulation functions.
777  */
778 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
779 static int  mgsl_get_rx_frame( struct mgsl_struct *info );
780 static int  mgsl_get_raw_rx_frame( struct mgsl_struct *info );
781 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
782 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
783 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
784 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
785 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
786
787 /*
788  * DMA and Shared Memory buffer allocation and formatting
789  */
790 static int  mgsl_allocate_dma_buffers(struct mgsl_struct *info);
791 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
792 static int  mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
793 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
794 static int  mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
795 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
796 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
797 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
798 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
799 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
800 static int load_next_tx_holding_buffer(struct mgsl_struct *info);
801 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
802
803 /*
804  * Bottom half interrupt handlers
805  */
806 static void mgsl_bh_handler(void* Context);
807 static void mgsl_bh_receive(struct mgsl_struct *info);
808 static void mgsl_bh_transmit(struct mgsl_struct *info);
809 static void mgsl_bh_status(struct mgsl_struct *info);
810
811 /*
812  * Interrupt handler routines and dispatch table.
813  */
814 static void mgsl_isr_null( struct mgsl_struct *info );
815 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
816 static void mgsl_isr_receive_data( struct mgsl_struct *info );
817 static void mgsl_isr_receive_status( struct mgsl_struct *info );
818 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
819 static void mgsl_isr_io_pin( struct mgsl_struct *info );
820 static void mgsl_isr_misc( struct mgsl_struct *info );
821 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
822 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
823
824 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
825
826 static isr_dispatch_func UscIsrTable[7] =
827 {
828         mgsl_isr_null,
829         mgsl_isr_misc,
830         mgsl_isr_io_pin,
831         mgsl_isr_transmit_data,
832         mgsl_isr_transmit_status,
833         mgsl_isr_receive_data,
834         mgsl_isr_receive_status
835 };
836
837 /*
838  * ioctl call handlers
839  */
840 static int tiocmget(struct tty_struct *tty, struct file *file);
841 static int tiocmset(struct tty_struct *tty, struct file *file,
842                     unsigned int set, unsigned int clear);
843 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
844         __user *user_icount);
845 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS  __user *user_params);
846 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS  __user *new_params);
847 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
848 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
849 static int mgsl_txenable(struct mgsl_struct * info, int enable);
850 static int mgsl_txabort(struct mgsl_struct * info);
851 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
852 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
853 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
854
855 /* set non-zero on successful registration with PCI subsystem */
856 static int pci_registered;
857
858 /*
859  * Global linked list of SyncLink devices
860  */
861 static struct mgsl_struct *mgsl_device_list;
862 static int mgsl_device_count;
863
864 /*
865  * Set this param to non-zero to load eax with the
866  * .text section address and breakpoint on module load.
867  * This is useful for use with gdb and add-symbol-file command.
868  */
869 static int break_on_load;
870
871 /*
872  * Driver major number, defaults to zero to get auto
873  * assigned major number. May be forced as module parameter.
874  */
875 static int ttymajor;
876
877 /*
878  * Array of user specified options for ISA adapters.
879  */
880 static int io[MAX_ISA_DEVICES];
881 static int irq[MAX_ISA_DEVICES];
882 static int dma[MAX_ISA_DEVICES];
883 static int debug_level;
884 static int maxframe[MAX_TOTAL_DEVICES];
885 static int dosyncppp[MAX_TOTAL_DEVICES];
886 static int txdmabufs[MAX_TOTAL_DEVICES];
887 static int txholdbufs[MAX_TOTAL_DEVICES];
888         
889 module_param(break_on_load, bool, 0);
890 module_param(ttymajor, int, 0);
891 module_param_array(io, int, NULL, 0);
892 module_param_array(irq, int, NULL, 0);
893 module_param_array(dma, int, NULL, 0);
894 module_param(debug_level, int, 0);
895 module_param_array(maxframe, int, NULL, 0);
896 module_param_array(dosyncppp, int, NULL, 0);
897 module_param_array(txdmabufs, int, NULL, 0);
898 module_param_array(txholdbufs, int, NULL, 0);
899
900 static char *driver_name = "SyncLink serial driver";
901 static char *driver_version = "$Revision: 4.38 $";
902
903 static int synclink_init_one (struct pci_dev *dev,
904                                      const struct pci_device_id *ent);
905 static void synclink_remove_one (struct pci_dev *dev);
906
907 static struct pci_device_id synclink_pci_tbl[] = {
908         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
909         { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
910         { 0, }, /* terminate list */
911 };
912 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
913
914 MODULE_LICENSE("GPL");
915
916 static struct pci_driver synclink_pci_driver = {
917         .name           = "synclink",
918         .id_table       = synclink_pci_tbl,
919         .probe          = synclink_init_one,
920         .remove         = __devexit_p(synclink_remove_one),
921 };
922
923 static struct tty_driver *serial_driver;
924
925 /* number of characters left in xmit buffer before we ask for more */
926 #define WAKEUP_CHARS 256
927
928
929 static void mgsl_change_params(struct mgsl_struct *info);
930 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
931
932 /*
933  * 1st function defined in .text section. Calling this function in
934  * init_module() followed by a breakpoint allows a remote debugger
935  * (gdb) to get the .text address for the add-symbol-file command.
936  * This allows remote debugging of dynamically loadable modules.
937  */
938 static void* mgsl_get_text_ptr(void)
939 {
940         return mgsl_get_text_ptr;
941 }
942
943 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
944                                         char *name, const char *routine)
945 {
946 #ifdef MGSL_PARANOIA_CHECK
947         static const char *badmagic =
948                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
949         static const char *badinfo =
950                 "Warning: null mgsl_struct for (%s) in %s\n";
951
952         if (!info) {
953                 printk(badinfo, name, routine);
954                 return 1;
955         }
956         if (info->magic != MGSL_MAGIC) {
957                 printk(badmagic, name, routine);
958                 return 1;
959         }
960 #else
961         if (!info)
962                 return 1;
963 #endif
964         return 0;
965 }
966
967 /**
968  * line discipline callback wrappers
969  *
970  * The wrappers maintain line discipline references
971  * while calling into the line discipline.
972  *
973  * ldisc_receive_buf  - pass receive data to line discipline
974  */
975
976 static void ldisc_receive_buf(struct tty_struct *tty,
977                               const __u8 *data, char *flags, int count)
978 {
979         struct tty_ldisc *ld;
980         if (!tty)
981                 return;
982         ld = tty_ldisc_ref(tty);
983         if (ld) {
984                 if (ld->receive_buf)
985                         ld->receive_buf(tty, data, flags, count);
986                 tty_ldisc_deref(ld);
987         }
988 }
989
990 /* mgsl_stop()          throttle (stop) transmitter
991  *      
992  * Arguments:           tty     pointer to tty info structure
993  * Return Value:        None
994  */
995 static void mgsl_stop(struct tty_struct *tty)
996 {
997         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
998         unsigned long flags;
999         
1000         if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
1001                 return;
1002         
1003         if ( debug_level >= DEBUG_LEVEL_INFO )
1004                 printk("mgsl_stop(%s)\n",info->device_name);    
1005                 
1006         spin_lock_irqsave(&info->irq_spinlock,flags);
1007         if (info->tx_enabled)
1008                 usc_stop_transmitter(info);
1009         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1010         
1011 }       /* end of mgsl_stop() */
1012
1013 /* mgsl_start()         release (start) transmitter
1014  *      
1015  * Arguments:           tty     pointer to tty info structure
1016  * Return Value:        None
1017  */
1018 static void mgsl_start(struct tty_struct *tty)
1019 {
1020         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1021         unsigned long flags;
1022         
1023         if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1024                 return;
1025         
1026         if ( debug_level >= DEBUG_LEVEL_INFO )
1027                 printk("mgsl_start(%s)\n",info->device_name);   
1028                 
1029         spin_lock_irqsave(&info->irq_spinlock,flags);
1030         if (!info->tx_enabled)
1031                 usc_start_transmitter(info);
1032         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1033         
1034 }       /* end of mgsl_start() */
1035
1036 /*
1037  * Bottom half work queue access functions
1038  */
1039
1040 /* mgsl_bh_action()     Return next bottom half action to perform.
1041  * Return Value:        BH action code or 0 if nothing to do.
1042  */
1043 static int mgsl_bh_action(struct mgsl_struct *info)
1044 {
1045         unsigned long flags;
1046         int rc = 0;
1047         
1048         spin_lock_irqsave(&info->irq_spinlock,flags);
1049
1050         if (info->pending_bh & BH_RECEIVE) {
1051                 info->pending_bh &= ~BH_RECEIVE;
1052                 rc = BH_RECEIVE;
1053         } else if (info->pending_bh & BH_TRANSMIT) {
1054                 info->pending_bh &= ~BH_TRANSMIT;
1055                 rc = BH_TRANSMIT;
1056         } else if (info->pending_bh & BH_STATUS) {
1057                 info->pending_bh &= ~BH_STATUS;
1058                 rc = BH_STATUS;
1059         }
1060
1061         if (!rc) {
1062                 /* Mark BH routine as complete */
1063                 info->bh_running   = 0;
1064                 info->bh_requested = 0;
1065         }
1066         
1067         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1068         
1069         return rc;
1070 }
1071
1072 /*
1073  *      Perform bottom half processing of work items queued by ISR.
1074  */
1075 static void mgsl_bh_handler(void* Context)
1076 {
1077         struct mgsl_struct *info = (struct mgsl_struct*)Context;
1078         int action;
1079
1080         if (!info)
1081                 return;
1082                 
1083         if ( debug_level >= DEBUG_LEVEL_BH )
1084                 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1085                         __FILE__,__LINE__,info->device_name);
1086         
1087         info->bh_running = 1;
1088
1089         while((action = mgsl_bh_action(info)) != 0) {
1090         
1091                 /* Process work item */
1092                 if ( debug_level >= DEBUG_LEVEL_BH )
1093                         printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1094                                 __FILE__,__LINE__,action);
1095
1096                 switch (action) {
1097                 
1098                 case BH_RECEIVE:
1099                         mgsl_bh_receive(info);
1100                         break;
1101                 case BH_TRANSMIT:
1102                         mgsl_bh_transmit(info);
1103                         break;
1104                 case BH_STATUS:
1105                         mgsl_bh_status(info);
1106                         break;
1107                 default:
1108                         /* unknown work item ID */
1109                         printk("Unknown work item ID=%08X!\n", action);
1110                         break;
1111                 }
1112         }
1113
1114         if ( debug_level >= DEBUG_LEVEL_BH )
1115                 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1116                         __FILE__,__LINE__,info->device_name);
1117 }
1118
1119 static void mgsl_bh_receive(struct mgsl_struct *info)
1120 {
1121         int (*get_rx_frame)(struct mgsl_struct *info) =
1122                 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1123
1124         if ( debug_level >= DEBUG_LEVEL_BH )
1125                 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1126                         __FILE__,__LINE__,info->device_name);
1127         
1128         do
1129         {
1130                 if (info->rx_rcc_underrun) {
1131                         unsigned long flags;
1132                         spin_lock_irqsave(&info->irq_spinlock,flags);
1133                         usc_start_receiver(info);
1134                         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1135                         return;
1136                 }
1137         } while(get_rx_frame(info));
1138 }
1139
1140 static void mgsl_bh_transmit(struct mgsl_struct *info)
1141 {
1142         struct tty_struct *tty = info->tty;
1143         unsigned long flags;
1144         
1145         if ( debug_level >= DEBUG_LEVEL_BH )
1146                 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1147                         __FILE__,__LINE__,info->device_name);
1148
1149         if (tty) {
1150                 tty_wakeup(tty);
1151                 wake_up_interruptible(&tty->write_wait);
1152         }
1153
1154         /* if transmitter idle and loopmode_send_done_requested
1155          * then start echoing RxD to TxD
1156          */
1157         spin_lock_irqsave(&info->irq_spinlock,flags);
1158         if ( !info->tx_active && info->loopmode_send_done_requested )
1159                 usc_loopmode_send_done( info );
1160         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1161 }
1162
1163 static void mgsl_bh_status(struct mgsl_struct *info)
1164 {
1165         if ( debug_level >= DEBUG_LEVEL_BH )
1166                 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1167                         __FILE__,__LINE__,info->device_name);
1168
1169         info->ri_chkcount = 0;
1170         info->dsr_chkcount = 0;
1171         info->dcd_chkcount = 0;
1172         info->cts_chkcount = 0;
1173 }
1174
1175 /* mgsl_isr_receive_status()
1176  * 
1177  *      Service a receive status interrupt. The type of status
1178  *      interrupt is indicated by the state of the RCSR.
1179  *      This is only used for HDLC mode.
1180  *
1181  * Arguments:           info    pointer to device instance data
1182  * Return Value:        None
1183  */
1184 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1185 {
1186         u16 status = usc_InReg( info, RCSR );
1187
1188         if ( debug_level >= DEBUG_LEVEL_ISR )   
1189                 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1190                         __FILE__,__LINE__,status);
1191                         
1192         if ( (status & RXSTATUS_ABORT_RECEIVED) && 
1193                 info->loopmode_insert_requested &&
1194                 usc_loopmode_active(info) )
1195         {
1196                 ++info->icount.rxabort;
1197                 info->loopmode_insert_requested = FALSE;
1198  
1199                 /* clear CMR:13 to start echoing RxD to TxD */
1200                 info->cmr_value &= ~BIT13;
1201                 usc_OutReg(info, CMR, info->cmr_value);
1202  
1203                 /* disable received abort irq (no longer required) */
1204                 usc_OutReg(info, RICR,
1205                         (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1206         }
1207
1208         if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1209                 if (status & RXSTATUS_EXITED_HUNT)
1210                         info->icount.exithunt++;
1211                 if (status & RXSTATUS_IDLE_RECEIVED)
1212                         info->icount.rxidle++;
1213                 wake_up_interruptible(&info->event_wait_q);
1214         }
1215
1216         if (status & RXSTATUS_OVERRUN){
1217                 info->icount.rxover++;
1218                 usc_process_rxoverrun_sync( info );
1219         }
1220
1221         usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1222         usc_UnlatchRxstatusBits( info, status );
1223
1224 }       /* end of mgsl_isr_receive_status() */
1225
1226 /* mgsl_isr_transmit_status()
1227  * 
1228  *      Service a transmit status interrupt
1229  *      HDLC mode :end of transmit frame
1230  *      Async mode:all data is sent
1231  *      transmit status is indicated by bits in the TCSR.
1232  * 
1233  * Arguments:           info           pointer to device instance data
1234  * Return Value:        None
1235  */
1236 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1237 {
1238         u16 status = usc_InReg( info, TCSR );
1239
1240         if ( debug_level >= DEBUG_LEVEL_ISR )   
1241                 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1242                         __FILE__,__LINE__,status);
1243         
1244         usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1245         usc_UnlatchTxstatusBits( info, status );
1246         
1247         if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1248         {
1249                 /* finished sending HDLC abort. This may leave  */
1250                 /* the TxFifo with data from the aborted frame  */
1251                 /* so purge the TxFifo. Also shutdown the DMA   */
1252                 /* channel in case there is data remaining in   */
1253                 /* the DMA buffer                               */
1254                 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1255                 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1256         }
1257  
1258         if ( status & TXSTATUS_EOF_SENT )
1259                 info->icount.txok++;
1260         else if ( status & TXSTATUS_UNDERRUN )
1261                 info->icount.txunder++;
1262         else if ( status & TXSTATUS_ABORT_SENT )
1263                 info->icount.txabort++;
1264         else
1265                 info->icount.txunder++;
1266                         
1267         info->tx_active = 0;
1268         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1269         del_timer(&info->tx_timer);     
1270         
1271         if ( info->drop_rts_on_tx_done ) {
1272                 usc_get_serial_signals( info );
1273                 if ( info->serial_signals & SerialSignal_RTS ) {
1274                         info->serial_signals &= ~SerialSignal_RTS;
1275                         usc_set_serial_signals( info );
1276                 }
1277                 info->drop_rts_on_tx_done = 0;
1278         }
1279
1280 #ifdef CONFIG_HDLC
1281         if (info->netcount)
1282                 hdlcdev_tx_done(info);
1283         else 
1284 #endif
1285         {
1286                 if (info->tty->stopped || info->tty->hw_stopped) {
1287                         usc_stop_transmitter(info);
1288                         return;
1289                 }
1290                 info->pending_bh |= BH_TRANSMIT;
1291         }
1292
1293 }       /* end of mgsl_isr_transmit_status() */
1294
1295 /* mgsl_isr_io_pin()
1296  * 
1297  *      Service an Input/Output pin interrupt. The type of
1298  *      interrupt is indicated by bits in the MISR
1299  *      
1300  * Arguments:           info           pointer to device instance data
1301  * Return Value:        None
1302  */
1303 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1304 {
1305         struct  mgsl_icount *icount;
1306         u16 status = usc_InReg( info, MISR );
1307
1308         if ( debug_level >= DEBUG_LEVEL_ISR )   
1309                 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1310                         __FILE__,__LINE__,status);
1311                         
1312         usc_ClearIrqPendingBits( info, IO_PIN );
1313         usc_UnlatchIostatusBits( info, status );
1314
1315         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1316                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1317                 icount = &info->icount;
1318                 /* update input line counters */
1319                 if (status & MISCSTATUS_RI_LATCHED) {
1320                         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1321                                 usc_DisablestatusIrqs(info,SICR_RI);
1322                         icount->rng++;
1323                         if ( status & MISCSTATUS_RI )
1324                                 info->input_signal_events.ri_up++;      
1325                         else
1326                                 info->input_signal_events.ri_down++;    
1327                 }
1328                 if (status & MISCSTATUS_DSR_LATCHED) {
1329                         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1330                                 usc_DisablestatusIrqs(info,SICR_DSR);
1331                         icount->dsr++;
1332                         if ( status & MISCSTATUS_DSR )
1333                                 info->input_signal_events.dsr_up++;
1334                         else
1335                                 info->input_signal_events.dsr_down++;
1336                 }
1337                 if (status & MISCSTATUS_DCD_LATCHED) {
1338                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1339                                 usc_DisablestatusIrqs(info,SICR_DCD);
1340                         icount->dcd++;
1341                         if (status & MISCSTATUS_DCD) {
1342                                 info->input_signal_events.dcd_up++;
1343                         } else
1344                                 info->input_signal_events.dcd_down++;
1345 #ifdef CONFIG_HDLC
1346                         if (info->netcount) {
1347                                 if (status & MISCSTATUS_DCD)
1348                                         netif_carrier_on(info->netdev);
1349                                 else
1350                                         netif_carrier_off(info->netdev);
1351                         }
1352 #endif
1353                 }
1354                 if (status & MISCSTATUS_CTS_LATCHED)
1355                 {
1356                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1357                                 usc_DisablestatusIrqs(info,SICR_CTS);
1358                         icount->cts++;
1359                         if ( status & MISCSTATUS_CTS )
1360                                 info->input_signal_events.cts_up++;
1361                         else
1362                                 info->input_signal_events.cts_down++;
1363                 }
1364                 wake_up_interruptible(&info->status_event_wait_q);
1365                 wake_up_interruptible(&info->event_wait_q);
1366
1367                 if ( (info->flags & ASYNC_CHECK_CD) && 
1368                      (status & MISCSTATUS_DCD_LATCHED) ) {
1369                         if ( debug_level >= DEBUG_LEVEL_ISR )
1370                                 printk("%s CD now %s...", info->device_name,
1371                                        (status & MISCSTATUS_DCD) ? "on" : "off");
1372                         if (status & MISCSTATUS_DCD)
1373                                 wake_up_interruptible(&info->open_wait);
1374                         else {
1375                                 if ( debug_level >= DEBUG_LEVEL_ISR )
1376                                         printk("doing serial hangup...");
1377                                 if (info->tty)
1378                                         tty_hangup(info->tty);
1379                         }
1380                 }
1381         
1382                 if ( (info->flags & ASYNC_CTS_FLOW) && 
1383                      (status & MISCSTATUS_CTS_LATCHED) ) {
1384                         if (info->tty->hw_stopped) {
1385                                 if (status & MISCSTATUS_CTS) {
1386                                         if ( debug_level >= DEBUG_LEVEL_ISR )
1387                                                 printk("CTS tx start...");
1388                                         if (info->tty)
1389                                                 info->tty->hw_stopped = 0;
1390                                         usc_start_transmitter(info);
1391                                         info->pending_bh |= BH_TRANSMIT;
1392                                         return;
1393                                 }
1394                         } else {
1395                                 if (!(status & MISCSTATUS_CTS)) {
1396                                         if ( debug_level >= DEBUG_LEVEL_ISR )
1397                                                 printk("CTS tx stop...");
1398                                         if (info->tty)
1399                                                 info->tty->hw_stopped = 1;
1400                                         usc_stop_transmitter(info);
1401                                 }
1402                         }
1403                 }
1404         }
1405
1406         info->pending_bh |= BH_STATUS;
1407         
1408         /* for diagnostics set IRQ flag */
1409         if ( status & MISCSTATUS_TXC_LATCHED ){
1410                 usc_OutReg( info, SICR,
1411                         (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1412                 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1413                 info->irq_occurred = 1;
1414         }
1415
1416 }       /* end of mgsl_isr_io_pin() */
1417
1418 /* mgsl_isr_transmit_data()
1419  * 
1420  *      Service a transmit data interrupt (async mode only).
1421  * 
1422  * Arguments:           info    pointer to device instance data
1423  * Return Value:        None
1424  */
1425 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1426 {
1427         if ( debug_level >= DEBUG_LEVEL_ISR )   
1428                 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1429                         __FILE__,__LINE__,info->xmit_cnt);
1430                         
1431         usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1432         
1433         if (info->tty->stopped || info->tty->hw_stopped) {
1434                 usc_stop_transmitter(info);
1435                 return;
1436         }
1437         
1438         if ( info->xmit_cnt )
1439                 usc_load_txfifo( info );
1440         else
1441                 info->tx_active = 0;
1442                 
1443         if (info->xmit_cnt < WAKEUP_CHARS)
1444                 info->pending_bh |= BH_TRANSMIT;
1445
1446 }       /* end of mgsl_isr_transmit_data() */
1447
1448 /* mgsl_isr_receive_data()
1449  * 
1450  *      Service a receive data interrupt. This occurs
1451  *      when operating in asynchronous interrupt transfer mode.
1452  *      The receive data FIFO is flushed to the receive data buffers. 
1453  * 
1454  * Arguments:           info            pointer to device instance data
1455  * Return Value:        None
1456  */
1457 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1458 {
1459         int Fifocount;
1460         u16 status;
1461         int work = 0;
1462         unsigned char DataByte;
1463         struct tty_struct *tty = info->tty;
1464         struct  mgsl_icount *icount = &info->icount;
1465         
1466         if ( debug_level >= DEBUG_LEVEL_ISR )   
1467                 printk("%s(%d):mgsl_isr_receive_data\n",
1468                         __FILE__,__LINE__);
1469
1470         usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1471         
1472         /* select FIFO status for RICR readback */
1473         usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1474
1475         /* clear the Wordstatus bit so that status readback */
1476         /* only reflects the status of this byte */
1477         usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1478
1479         /* flush the receive FIFO */
1480
1481         while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1482                 int flag;
1483
1484                 /* read one byte from RxFIFO */
1485                 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1486                       info->io_base + CCAR );
1487                 DataByte = inb( info->io_base + CCAR );
1488
1489                 /* get the status of the received byte */
1490                 status = usc_InReg(info, RCSR);
1491                 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1492                                 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1493                         usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1494                 
1495                 icount->rx++;
1496                 
1497                 flag = 0;
1498                 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1499                                 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1500                         printk("rxerr=%04X\n",status);                                  
1501                         /* update error statistics */
1502                         if ( status & RXSTATUS_BREAK_RECEIVED ) {
1503                                 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1504                                 icount->brk++;
1505                         } else if (status & RXSTATUS_PARITY_ERROR) 
1506                                 icount->parity++;
1507                         else if (status & RXSTATUS_FRAMING_ERROR)
1508                                 icount->frame++;
1509                         else if (status & RXSTATUS_OVERRUN) {
1510                                 /* must issue purge fifo cmd before */
1511                                 /* 16C32 accepts more receive chars */
1512                                 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1513                                 icount->overrun++;
1514                         }
1515
1516                         /* discard char if tty control flags say so */                                  
1517                         if (status & info->ignore_status_mask)
1518                                 continue;
1519                                 
1520                         status &= info->read_status_mask;
1521                 
1522                         if (status & RXSTATUS_BREAK_RECEIVED) {
1523                                 flag = TTY_BREAK;
1524                                 if (info->flags & ASYNC_SAK)
1525                                         do_SAK(tty);
1526                         } else if (status & RXSTATUS_PARITY_ERROR)
1527                                 flag = TTY_PARITY;
1528                         else if (status & RXSTATUS_FRAMING_ERROR)
1529                                 flag = TTY_FRAME;
1530                 }       /* end of if (error) */
1531                 tty_insert_flip_char(tty, DataByte, flag);
1532                 if (status & RXSTATUS_OVERRUN) {
1533                         /* Overrun is special, since it's
1534                          * reported immediately, and doesn't
1535                          * affect the current character
1536                          */
1537                         work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1538                 }
1539         }
1540
1541         if ( debug_level >= DEBUG_LEVEL_ISR ) {
1542                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1543                         __FILE__,__LINE__,icount->rx,icount->brk,
1544                         icount->parity,icount->frame,icount->overrun);
1545         }
1546                         
1547         if(work)
1548                 tty_flip_buffer_push(tty);
1549 }
1550
1551 /* mgsl_isr_misc()
1552  * 
1553  *      Service a miscellaneos interrupt source.
1554  *      
1555  * Arguments:           info            pointer to device extension (instance data)
1556  * Return Value:        None
1557  */
1558 static void mgsl_isr_misc( struct mgsl_struct *info )
1559 {
1560         u16 status = usc_InReg( info, MISR );
1561
1562         if ( debug_level >= DEBUG_LEVEL_ISR )   
1563                 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1564                         __FILE__,__LINE__,status);
1565                         
1566         if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1567             (info->params.mode == MGSL_MODE_HDLC)) {
1568
1569                 /* turn off receiver and rx DMA */
1570                 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1571                 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1572                 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1573                 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1574                 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1575
1576                 /* schedule BH handler to restart receiver */
1577                 info->pending_bh |= BH_RECEIVE;
1578                 info->rx_rcc_underrun = 1;
1579         }
1580
1581         usc_ClearIrqPendingBits( info, MISC );
1582         usc_UnlatchMiscstatusBits( info, status );
1583
1584 }       /* end of mgsl_isr_misc() */
1585
1586 /* mgsl_isr_null()
1587  *
1588  *      Services undefined interrupt vectors from the
1589  *      USC. (hence this function SHOULD never be called)
1590  * 
1591  * Arguments:           info            pointer to device extension (instance data)
1592  * Return Value:        None
1593  */
1594 static void mgsl_isr_null( struct mgsl_struct *info )
1595 {
1596
1597 }       /* end of mgsl_isr_null() */
1598
1599 /* mgsl_isr_receive_dma()
1600  * 
1601  *      Service a receive DMA channel interrupt.
1602  *      For this driver there are two sources of receive DMA interrupts
1603  *      as identified in the Receive DMA mode Register (RDMR):
1604  * 
1605  *      BIT3    EOA/EOL         End of List, all receive buffers in receive
1606  *                              buffer list have been filled (no more free buffers
1607  *                              available). The DMA controller has shut down.
1608  * 
1609  *      BIT2    EOB             End of Buffer. This interrupt occurs when a receive
1610  *                              DMA buffer is terminated in response to completion
1611  *                              of a good frame or a frame with errors. The status
1612  *                              of the frame is stored in the buffer entry in the
1613  *                              list of receive buffer entries.
1614  * 
1615  * Arguments:           info            pointer to device instance data
1616  * Return Value:        None
1617  */
1618 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1619 {
1620         u16 status;
1621         
1622         /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1623         usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1624
1625         /* Read the receive DMA status to identify interrupt type. */
1626         /* This also clears the status bits. */
1627         status = usc_InDmaReg( info, RDMR );
1628
1629         if ( debug_level >= DEBUG_LEVEL_ISR )   
1630                 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1631                         __FILE__,__LINE__,info->device_name,status);
1632                         
1633         info->pending_bh |= BH_RECEIVE;
1634         
1635         if ( status & BIT3 ) {
1636                 info->rx_overflow = 1;
1637                 info->icount.buf_overrun++;
1638         }
1639
1640 }       /* end of mgsl_isr_receive_dma() */
1641
1642 /* mgsl_isr_transmit_dma()
1643  *
1644  *      This function services a transmit DMA channel interrupt.
1645  *
1646  *      For this driver there is one source of transmit DMA interrupts
1647  *      as identified in the Transmit DMA Mode Register (TDMR):
1648  *
1649  *      BIT2  EOB       End of Buffer. This interrupt occurs when a
1650  *                      transmit DMA buffer has been emptied.
1651  *
1652  *      The driver maintains enough transmit DMA buffers to hold at least
1653  *      one max frame size transmit frame. When operating in a buffered
1654  *      transmit mode, there may be enough transmit DMA buffers to hold at
1655  *      least two or more max frame size frames. On an EOB condition,
1656  *      determine if there are any queued transmit buffers and copy into
1657  *      transmit DMA buffers if we have room.
1658  *
1659  * Arguments:           info            pointer to device instance data
1660  * Return Value:        None
1661  */
1662 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1663 {
1664         u16 status;
1665
1666         /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1667         usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1668
1669         /* Read the transmit DMA status to identify interrupt type. */
1670         /* This also clears the status bits. */
1671
1672         status = usc_InDmaReg( info, TDMR );
1673
1674         if ( debug_level >= DEBUG_LEVEL_ISR )
1675                 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1676                         __FILE__,__LINE__,info->device_name,status);
1677
1678         if ( status & BIT2 ) {
1679                 --info->tx_dma_buffers_used;
1680
1681                 /* if there are transmit frames queued,
1682                  *  try to load the next one
1683                  */
1684                 if ( load_next_tx_holding_buffer(info) ) {
1685                         /* if call returns non-zero value, we have
1686                          * at least one free tx holding buffer
1687                          */
1688                         info->pending_bh |= BH_TRANSMIT;
1689                 }
1690         }
1691
1692 }       /* end of mgsl_isr_transmit_dma() */
1693
1694 /* mgsl_interrupt()
1695  * 
1696  *      Interrupt service routine entry point.
1697  *      
1698  * Arguments:
1699  * 
1700  *      irq             interrupt number that caused interrupt
1701  *      dev_id          device ID supplied during interrupt registration
1702  *      regs            interrupted processor context
1703  *      
1704  * Return Value: None
1705  */
1706 static irqreturn_t mgsl_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1707 {
1708         struct mgsl_struct * info;
1709         u16 UscVector;
1710         u16 DmaVector;
1711
1712         if ( debug_level >= DEBUG_LEVEL_ISR )   
1713                 printk("%s(%d):mgsl_interrupt(%d)entry.\n",
1714                         __FILE__,__LINE__,irq);
1715
1716         info = (struct mgsl_struct *)dev_id;    
1717         if (!info)
1718                 return IRQ_NONE;
1719                 
1720         spin_lock(&info->irq_spinlock);
1721
1722         for(;;) {
1723                 /* Read the interrupt vectors from hardware. */
1724                 UscVector = usc_InReg(info, IVR) >> 9;
1725                 DmaVector = usc_InDmaReg(info, DIVR);
1726                 
1727                 if ( debug_level >= DEBUG_LEVEL_ISR )   
1728                         printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1729                                 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1730                         
1731                 if ( !UscVector && !DmaVector )
1732                         break;
1733                         
1734                 /* Dispatch interrupt vector */
1735                 if ( UscVector )
1736                         (*UscIsrTable[UscVector])(info);
1737                 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1738                         mgsl_isr_transmit_dma(info);
1739                 else
1740                         mgsl_isr_receive_dma(info);
1741
1742                 if ( info->isr_overflow ) {
1743                         printk(KERN_ERR"%s(%d):%s isr overflow irq=%d\n",
1744                                 __FILE__,__LINE__,info->device_name, irq);
1745                         usc_DisableMasterIrqBit(info);
1746                         usc_DisableDmaInterrupts(info,DICR_MASTER);
1747                         break;
1748                 }
1749         }
1750         
1751         /* Request bottom half processing if there's something 
1752          * for it to do and the bh is not already running
1753          */
1754
1755         if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1756                 if ( debug_level >= DEBUG_LEVEL_ISR )   
1757                         printk("%s(%d):%s queueing bh task.\n",
1758                                 __FILE__,__LINE__,info->device_name);
1759                 schedule_work(&info->task);
1760                 info->bh_requested = 1;
1761         }
1762
1763         spin_unlock(&info->irq_spinlock);
1764         
1765         if ( debug_level >= DEBUG_LEVEL_ISR )   
1766                 printk("%s(%d):mgsl_interrupt(%d)exit.\n",
1767                         __FILE__,__LINE__,irq);
1768         return IRQ_HANDLED;
1769 }       /* end of mgsl_interrupt() */
1770
1771 /* startup()
1772  * 
1773  *      Initialize and start device.
1774  *      
1775  * Arguments:           info    pointer to device instance data
1776  * Return Value:        0 if success, otherwise error code
1777  */
1778 static int startup(struct mgsl_struct * info)
1779 {
1780         int retval = 0;
1781         
1782         if ( debug_level >= DEBUG_LEVEL_INFO )
1783                 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1784                 
1785         if (info->flags & ASYNC_INITIALIZED)
1786                 return 0;
1787         
1788         if (!info->xmit_buf) {
1789                 /* allocate a page of memory for a transmit buffer */
1790                 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1791                 if (!info->xmit_buf) {
1792                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1793                                 __FILE__,__LINE__,info->device_name);
1794                         return -ENOMEM;
1795                 }
1796         }
1797
1798         info->pending_bh = 0;
1799         
1800         memset(&info->icount, 0, sizeof(info->icount));
1801
1802         init_timer(&info->tx_timer);
1803         info->tx_timer.data = (unsigned long)info;
1804         info->tx_timer.function = mgsl_tx_timeout;
1805         
1806         /* Allocate and claim adapter resources */
1807         retval = mgsl_claim_resources(info);
1808         
1809         /* perform existence check and diagnostics */
1810         if ( !retval )
1811                 retval = mgsl_adapter_test(info);
1812                 
1813         if ( retval ) {
1814                 if (capable(CAP_SYS_ADMIN) && info->tty)
1815                         set_bit(TTY_IO_ERROR, &info->tty->flags);
1816                 mgsl_release_resources(info);
1817                 return retval;
1818         }
1819
1820         /* program hardware for current parameters */
1821         mgsl_change_params(info);
1822         
1823         if (info->tty)
1824                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1825
1826         info->flags |= ASYNC_INITIALIZED;
1827         
1828         return 0;
1829         
1830 }       /* end of startup() */
1831
1832 /* shutdown()
1833  *
1834  * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1835  *
1836  * Arguments:           info    pointer to device instance data
1837  * Return Value:        None
1838  */
1839 static void shutdown(struct mgsl_struct * info)
1840 {
1841         unsigned long flags;
1842         
1843         if (!(info->flags & ASYNC_INITIALIZED))
1844                 return;
1845
1846         if (debug_level >= DEBUG_LEVEL_INFO)
1847                 printk("%s(%d):mgsl_shutdown(%s)\n",
1848                          __FILE__,__LINE__, info->device_name );
1849
1850         /* clear status wait queue because status changes */
1851         /* can't happen after shutting down the hardware */
1852         wake_up_interruptible(&info->status_event_wait_q);
1853         wake_up_interruptible(&info->event_wait_q);
1854
1855         del_timer(&info->tx_timer);     
1856
1857         if (info->xmit_buf) {
1858                 free_page((unsigned long) info->xmit_buf);
1859                 info->xmit_buf = NULL;
1860         }
1861
1862         spin_lock_irqsave(&info->irq_spinlock,flags);
1863         usc_DisableMasterIrqBit(info);
1864         usc_stop_receiver(info);
1865         usc_stop_transmitter(info);
1866         usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1867                 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1868         usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1869         
1870         /* Disable DMAEN (Port 7, Bit 14) */
1871         /* This disconnects the DMA request signal from the ISA bus */
1872         /* on the ISA adapter. This has no effect for the PCI adapter */
1873         usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1874         
1875         /* Disable INTEN (Port 6, Bit12) */
1876         /* This disconnects the IRQ request signal to the ISA bus */
1877         /* on the ISA adapter. This has no effect for the PCI adapter */
1878         usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1879         
1880         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1881                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1882                 usc_set_serial_signals(info);
1883         }
1884         
1885         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1886
1887         mgsl_release_resources(info);   
1888         
1889         if (info->tty)
1890                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1891
1892         info->flags &= ~ASYNC_INITIALIZED;
1893         
1894 }       /* end of shutdown() */
1895
1896 static void mgsl_program_hw(struct mgsl_struct *info)
1897 {
1898         unsigned long flags;
1899
1900         spin_lock_irqsave(&info->irq_spinlock,flags);
1901         
1902         usc_stop_receiver(info);
1903         usc_stop_transmitter(info);
1904         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1905         
1906         if (info->params.mode == MGSL_MODE_HDLC ||
1907             info->params.mode == MGSL_MODE_RAW ||
1908             info->netcount)
1909                 usc_set_sync_mode(info);
1910         else
1911                 usc_set_async_mode(info);
1912                 
1913         usc_set_serial_signals(info);
1914         
1915         info->dcd_chkcount = 0;
1916         info->cts_chkcount = 0;
1917         info->ri_chkcount = 0;
1918         info->dsr_chkcount = 0;
1919
1920         usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);          
1921         usc_EnableInterrupts(info, IO_PIN);
1922         usc_get_serial_signals(info);
1923                 
1924         if (info->netcount || info->tty->termios->c_cflag & CREAD)
1925                 usc_start_receiver(info);
1926                 
1927         spin_unlock_irqrestore(&info->irq_spinlock,flags);
1928 }
1929
1930 /* Reconfigure adapter based on new parameters
1931  */
1932 static void mgsl_change_params(struct mgsl_struct *info)
1933 {
1934         unsigned cflag;
1935         int bits_per_char;
1936
1937         if (!info->tty || !info->tty->termios)
1938                 return;
1939                 
1940         if (debug_level >= DEBUG_LEVEL_INFO)
1941                 printk("%s(%d):mgsl_change_params(%s)\n",
1942                          __FILE__,__LINE__, info->device_name );
1943                          
1944         cflag = info->tty->termios->c_cflag;
1945
1946         /* if B0 rate (hangup) specified then negate DTR and RTS */
1947         /* otherwise assert DTR and RTS */
1948         if (cflag & CBAUD)
1949                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1950         else
1951                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1952         
1953         /* byte size and parity */
1954         
1955         switch (cflag & CSIZE) {
1956               case CS5: info->params.data_bits = 5; break;
1957               case CS6: info->params.data_bits = 6; break;
1958               case CS7: info->params.data_bits = 7; break;
1959               case CS8: info->params.data_bits = 8; break;
1960               /* Never happens, but GCC is too dumb to figure it out */
1961               default:  info->params.data_bits = 7; break;
1962               }
1963               
1964         if (cflag & CSTOPB)
1965                 info->params.stop_bits = 2;
1966         else
1967                 info->params.stop_bits = 1;
1968
1969         info->params.parity = ASYNC_PARITY_NONE;
1970         if (cflag & PARENB) {
1971                 if (cflag & PARODD)
1972                         info->params.parity = ASYNC_PARITY_ODD;
1973                 else
1974                         info->params.parity = ASYNC_PARITY_EVEN;
1975 #ifdef CMSPAR
1976                 if (cflag & CMSPAR)
1977                         info->params.parity = ASYNC_PARITY_SPACE;
1978 #endif
1979         }
1980
1981         /* calculate number of jiffies to transmit a full
1982          * FIFO (32 bytes) at specified data rate
1983          */
1984         bits_per_char = info->params.data_bits + 
1985                         info->params.stop_bits + 1;
1986
1987         /* if port data rate is set to 460800 or less then
1988          * allow tty settings to override, otherwise keep the
1989          * current data rate.
1990          */
1991         if (info->params.data_rate <= 460800)
1992                 info->params.data_rate = tty_get_baud_rate(info->tty);
1993         
1994         if ( info->params.data_rate ) {
1995                 info->timeout = (32*HZ*bits_per_char) / 
1996                                 info->params.data_rate;
1997         }
1998         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1999
2000         if (cflag & CRTSCTS)
2001                 info->flags |= ASYNC_CTS_FLOW;
2002         else
2003                 info->flags &= ~ASYNC_CTS_FLOW;
2004                 
2005         if (cflag & CLOCAL)
2006                 info->flags &= ~ASYNC_CHECK_CD;
2007         else
2008                 info->flags |= ASYNC_CHECK_CD;
2009
2010         /* process tty input control flags */
2011         
2012         info->read_status_mask = RXSTATUS_OVERRUN;
2013         if (I_INPCK(info->tty))
2014                 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2015         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2016                 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2017         
2018         if (I_IGNPAR(info->tty))
2019                 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2020         if (I_IGNBRK(info->tty)) {
2021                 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2022                 /* If ignoring parity and break indicators, ignore 
2023                  * overruns too.  (For real raw support).
2024                  */
2025                 if (I_IGNPAR(info->tty))
2026                         info->ignore_status_mask |= RXSTATUS_OVERRUN;
2027         }
2028
2029         mgsl_program_hw(info);
2030
2031 }       /* end of mgsl_change_params() */
2032
2033 /* mgsl_put_char()
2034  * 
2035  *      Add a character to the transmit buffer.
2036  *      
2037  * Arguments:           tty     pointer to tty information structure
2038  *                      ch      character to add to transmit buffer
2039  *              
2040  * Return Value:        None
2041  */
2042 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2043 {
2044         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2045         unsigned long flags;
2046
2047         if ( debug_level >= DEBUG_LEVEL_INFO ) {
2048                 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2049                         __FILE__,__LINE__,ch,info->device_name);
2050         }               
2051         
2052         if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2053                 return;
2054
2055         if (!tty || !info->xmit_buf)
2056                 return;
2057
2058         spin_lock_irqsave(&info->irq_spinlock,flags);
2059         
2060         if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2061         
2062                 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2063                         info->xmit_buf[info->xmit_head++] = ch;
2064                         info->xmit_head &= SERIAL_XMIT_SIZE-1;
2065                         info->xmit_cnt++;
2066                 }
2067         }
2068         
2069         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2070         
2071 }       /* end of mgsl_put_char() */
2072
2073 /* mgsl_flush_chars()
2074  * 
2075  *      Enable transmitter so remaining characters in the
2076  *      transmit buffer are sent.
2077  *      
2078  * Arguments:           tty     pointer to tty information structure
2079  * Return Value:        None
2080  */
2081 static void mgsl_flush_chars(struct tty_struct *tty)
2082 {
2083         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2084         unsigned long flags;
2085                                 
2086         if ( debug_level >= DEBUG_LEVEL_INFO )
2087                 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2088                         __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2089         
2090         if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2091                 return;
2092
2093         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2094             !info->xmit_buf)
2095                 return;
2096
2097         if ( debug_level >= DEBUG_LEVEL_INFO )
2098                 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2099                         __FILE__,__LINE__,info->device_name );
2100
2101         spin_lock_irqsave(&info->irq_spinlock,flags);
2102         
2103         if (!info->tx_active) {
2104                 if ( (info->params.mode == MGSL_MODE_HDLC ||
2105                         info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2106                         /* operating in synchronous (frame oriented) mode */
2107                         /* copy data from circular xmit_buf to */
2108                         /* transmit DMA buffer. */
2109                         mgsl_load_tx_dma_buffer(info,
2110                                  info->xmit_buf,info->xmit_cnt);
2111                 }
2112                 usc_start_transmitter(info);
2113         }
2114         
2115         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2116         
2117 }       /* end of mgsl_flush_chars() */
2118
2119 /* mgsl_write()
2120  * 
2121  *      Send a block of data
2122  *      
2123  * Arguments:
2124  * 
2125  *      tty             pointer to tty information structure
2126  *      buf             pointer to buffer containing send data
2127  *      count           size of send data in bytes
2128  *      
2129  * Return Value:        number of characters written
2130  */
2131 static int mgsl_write(struct tty_struct * tty,
2132                     const unsigned char *buf, int count)
2133 {
2134         int     c, ret = 0;
2135         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2136         unsigned long flags;
2137         
2138         if ( debug_level >= DEBUG_LEVEL_INFO )
2139                 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2140                         __FILE__,__LINE__,info->device_name,count);
2141         
2142         if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2143                 goto cleanup;
2144
2145         if (!tty || !info->xmit_buf)
2146                 goto cleanup;
2147
2148         if ( info->params.mode == MGSL_MODE_HDLC ||
2149                         info->params.mode == MGSL_MODE_RAW ) {
2150                 /* operating in synchronous (frame oriented) mode */
2151                 /* operating in synchronous (frame oriented) mode */
2152                 if (info->tx_active) {
2153
2154                         if ( info->params.mode == MGSL_MODE_HDLC ) {
2155                                 ret = 0;
2156                                 goto cleanup;
2157                         }
2158                         /* transmitter is actively sending data -
2159                          * if we have multiple transmit dma and
2160                          * holding buffers, attempt to queue this
2161                          * frame for transmission at a later time.
2162                          */
2163                         if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2164                                 /* no tx holding buffers available */
2165                                 ret = 0;
2166                                 goto cleanup;
2167                         }
2168
2169                         /* queue transmit frame request */
2170                         ret = count;
2171                         save_tx_buffer_request(info,buf,count);
2172
2173                         /* if we have sufficient tx dma buffers,
2174                          * load the next buffered tx request
2175                          */
2176                         spin_lock_irqsave(&info->irq_spinlock,flags);
2177                         load_next_tx_holding_buffer(info);
2178                         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2179                         goto cleanup;
2180                 }
2181         
2182                 /* if operating in HDLC LoopMode and the adapter  */
2183                 /* has yet to be inserted into the loop, we can't */
2184                 /* transmit                                       */
2185
2186                 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2187                         !usc_loopmode_active(info) )
2188                 {
2189                         ret = 0;
2190                         goto cleanup;
2191                 }
2192
2193                 if ( info->xmit_cnt ) {
2194                         /* Send accumulated from send_char() calls */
2195                         /* as frame and wait before accepting more data. */
2196                         ret = 0;
2197                         
2198                         /* copy data from circular xmit_buf to */
2199                         /* transmit DMA buffer. */
2200                         mgsl_load_tx_dma_buffer(info,
2201                                 info->xmit_buf,info->xmit_cnt);
2202                         if ( debug_level >= DEBUG_LEVEL_INFO )
2203                                 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2204                                         __FILE__,__LINE__,info->device_name);
2205                 } else {
2206                         if ( debug_level >= DEBUG_LEVEL_INFO )
2207                                 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2208                                         __FILE__,__LINE__,info->device_name);
2209                         ret = count;
2210                         info->xmit_cnt = count;
2211                         mgsl_load_tx_dma_buffer(info,buf,count);
2212                 }
2213         } else {
2214                 while (1) {
2215                         spin_lock_irqsave(&info->irq_spinlock,flags);
2216                         c = min_t(int, count,
2217                                 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2218                                     SERIAL_XMIT_SIZE - info->xmit_head));
2219                         if (c <= 0) {
2220                                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2221                                 break;
2222                         }
2223                         memcpy(info->xmit_buf + info->xmit_head, buf, c);
2224                         info->xmit_head = ((info->xmit_head + c) &
2225                                            (SERIAL_XMIT_SIZE-1));
2226                         info->xmit_cnt += c;
2227                         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2228                         buf += c;
2229                         count -= c;
2230                         ret += c;
2231                 }
2232         }       
2233         
2234         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2235                 spin_lock_irqsave(&info->irq_spinlock,flags);
2236                 if (!info->tx_active)
2237                         usc_start_transmitter(info);
2238                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2239         }
2240 cleanup:        
2241         if ( debug_level >= DEBUG_LEVEL_INFO )
2242                 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2243                         __FILE__,__LINE__,info->device_name,ret);
2244                         
2245         return ret;
2246         
2247 }       /* end of mgsl_write() */
2248
2249 /* mgsl_write_room()
2250  *
2251  *      Return the count of free bytes in transmit buffer
2252  *      
2253  * Arguments:           tty     pointer to tty info structure
2254  * Return Value:        None
2255  */
2256 static int mgsl_write_room(struct tty_struct *tty)
2257 {
2258         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2259         int     ret;
2260                                 
2261         if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2262                 return 0;
2263         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2264         if (ret < 0)
2265                 ret = 0;
2266                 
2267         if (debug_level >= DEBUG_LEVEL_INFO)
2268                 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2269                          __FILE__,__LINE__, info->device_name,ret );
2270                          
2271         if ( info->params.mode == MGSL_MODE_HDLC ||
2272                 info->params.mode == MGSL_MODE_RAW ) {
2273                 /* operating in synchronous (frame oriented) mode */
2274                 if ( info->tx_active )
2275                         return 0;
2276                 else
2277                         return HDLC_MAX_FRAME_SIZE;
2278         }
2279         
2280         return ret;
2281         
2282 }       /* end of mgsl_write_room() */
2283
2284 /* mgsl_chars_in_buffer()
2285  *
2286  *      Return the count of bytes in transmit buffer
2287  *      
2288  * Arguments:           tty     pointer to tty info structure
2289  * Return Value:        None
2290  */
2291 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2292 {
2293         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2294                          
2295         if (debug_level >= DEBUG_LEVEL_INFO)
2296                 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2297                          __FILE__,__LINE__, info->device_name );
2298                          
2299         if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2300                 return 0;
2301                 
2302         if (debug_level >= DEBUG_LEVEL_INFO)
2303                 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2304                          __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2305                          
2306         if ( info->params.mode == MGSL_MODE_HDLC ||
2307                 info->params.mode == MGSL_MODE_RAW ) {
2308                 /* operating in synchronous (frame oriented) mode */
2309                 if ( info->tx_active )
2310                         return info->max_frame_size;
2311                 else
2312                         return 0;
2313         }
2314                          
2315         return info->xmit_cnt;
2316 }       /* end of mgsl_chars_in_buffer() */
2317
2318 /* mgsl_flush_buffer()
2319  *
2320  *      Discard all data in the send buffer
2321  *      
2322  * Arguments:           tty     pointer to tty info structure
2323  * Return Value:        None
2324  */
2325 static void mgsl_flush_buffer(struct tty_struct *tty)
2326 {
2327         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2328         unsigned long flags;
2329         
2330         if (debug_level >= DEBUG_LEVEL_INFO)
2331                 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2332                          __FILE__,__LINE__, info->device_name );
2333         
2334         if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2335                 return;
2336                 
2337         spin_lock_irqsave(&info->irq_spinlock,flags); 
2338         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2339         del_timer(&info->tx_timer);     
2340         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2341         
2342         wake_up_interruptible(&tty->write_wait);
2343         tty_wakeup(tty);
2344 }
2345
2346 /* mgsl_send_xchar()
2347  *
2348  *      Send a high-priority XON/XOFF character
2349  *      
2350  * Arguments:           tty     pointer to tty info structure
2351  *                      ch      character to send
2352  * Return Value:        None
2353  */
2354 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2355 {
2356         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2357         unsigned long flags;
2358
2359         if (debug_level >= DEBUG_LEVEL_INFO)
2360                 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2361                          __FILE__,__LINE__, info->device_name, ch );
2362                          
2363         if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2364                 return;
2365
2366         info->x_char = ch;
2367         if (ch) {
2368                 /* Make sure transmit interrupts are on */
2369                 spin_lock_irqsave(&info->irq_spinlock,flags);
2370                 if (!info->tx_enabled)
2371                         usc_start_transmitter(info);
2372                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2373         }
2374 }       /* end of mgsl_send_xchar() */
2375
2376 /* mgsl_throttle()
2377  * 
2378  *      Signal remote device to throttle send data (our receive data)
2379  *      
2380  * Arguments:           tty     pointer to tty info structure
2381  * Return Value:        None
2382  */
2383 static void mgsl_throttle(struct tty_struct * tty)
2384 {
2385         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2386         unsigned long flags;
2387         
2388         if (debug_level >= DEBUG_LEVEL_INFO)
2389                 printk("%s(%d):mgsl_throttle(%s) entry\n",
2390                          __FILE__,__LINE__, info->device_name );
2391
2392         if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2393                 return;
2394         
2395         if (I_IXOFF(tty))
2396                 mgsl_send_xchar(tty, STOP_CHAR(tty));
2397  
2398         if (tty->termios->c_cflag & CRTSCTS) {
2399                 spin_lock_irqsave(&info->irq_spinlock,flags);
2400                 info->serial_signals &= ~SerialSignal_RTS;
2401                 usc_set_serial_signals(info);
2402                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2403         }
2404 }       /* end of mgsl_throttle() */
2405
2406 /* mgsl_unthrottle()
2407  * 
2408  *      Signal remote device to stop throttling send data (our receive data)
2409  *      
2410  * Arguments:           tty     pointer to tty info structure
2411  * Return Value:        None
2412  */
2413 static void mgsl_unthrottle(struct tty_struct * tty)
2414 {
2415         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2416         unsigned long flags;
2417         
2418         if (debug_level >= DEBUG_LEVEL_INFO)
2419                 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2420                          __FILE__,__LINE__, info->device_name );
2421
2422         if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2423                 return;
2424         
2425         if (I_IXOFF(tty)) {
2426                 if (info->x_char)
2427                         info->x_char = 0;
2428                 else
2429                         mgsl_send_xchar(tty, START_CHAR(tty));
2430         }
2431         
2432         if (tty->termios->c_cflag & CRTSCTS) {
2433                 spin_lock_irqsave(&info->irq_spinlock,flags);
2434                 info->serial_signals |= SerialSignal_RTS;
2435                 usc_set_serial_signals(info);
2436                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2437         }
2438         
2439 }       /* end of mgsl_unthrottle() */
2440
2441 /* mgsl_get_stats()
2442  * 
2443  *      get the current serial parameters information
2444  *
2445  * Arguments:   info            pointer to device instance data
2446  *              user_icount     pointer to buffer to hold returned stats
2447  *      
2448  * Return Value:        0 if success, otherwise error code
2449  */
2450 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2451 {
2452         int err;
2453         
2454         if (debug_level >= DEBUG_LEVEL_INFO)
2455                 printk("%s(%d):mgsl_get_params(%s)\n",
2456                          __FILE__,__LINE__, info->device_name);
2457                         
2458         if (!user_icount) {
2459                 memset(&info->icount, 0, sizeof(info->icount));
2460         } else {
2461                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2462                 if (err)
2463                         return -EFAULT;
2464         }
2465         
2466         return 0;
2467         
2468 }       /* end of mgsl_get_stats() */
2469
2470 /* mgsl_get_params()
2471  * 
2472  *      get the current serial parameters information
2473  *
2474  * Arguments:   info            pointer to device instance data
2475  *              user_params     pointer to buffer to hold returned params
2476  *      
2477  * Return Value:        0 if success, otherwise error code
2478  */
2479 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2480 {
2481         int err;
2482         if (debug_level >= DEBUG_LEVEL_INFO)
2483                 printk("%s(%d):mgsl_get_params(%s)\n",
2484                          __FILE__,__LINE__, info->device_name);
2485                         
2486         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2487         if (err) {
2488                 if ( debug_level >= DEBUG_LEVEL_INFO )
2489                         printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2490                                 __FILE__,__LINE__,info->device_name);
2491                 return -EFAULT;
2492         }
2493         
2494         return 0;
2495         
2496 }       /* end of mgsl_get_params() */
2497
2498 /* mgsl_set_params()
2499  * 
2500  *      set the serial parameters
2501  *      
2502  * Arguments:
2503  * 
2504  *      info            pointer to device instance data
2505  *      new_params      user buffer containing new serial params
2506  *
2507  * Return Value:        0 if success, otherwise error code
2508  */
2509 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2510 {
2511         unsigned long flags;
2512         MGSL_PARAMS tmp_params;
2513         int err;
2514  
2515         if (debug_level >= DEBUG_LEVEL_INFO)
2516                 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2517                         info->device_name );
2518         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2519         if (err) {
2520                 if ( debug_level >= DEBUG_LEVEL_INFO )
2521                         printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2522                                 __FILE__,__LINE__,info->device_name);
2523                 return -EFAULT;
2524         }
2525         
2526         spin_lock_irqsave(&info->irq_spinlock,flags);
2527         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2528         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2529         
2530         mgsl_change_params(info);
2531         
2532         return 0;
2533         
2534 }       /* end of mgsl_set_params() */
2535
2536 /* mgsl_get_txidle()
2537  * 
2538  *      get the current transmit idle mode
2539  *
2540  * Arguments:   info            pointer to device instance data
2541  *              idle_mode       pointer to buffer to hold returned idle mode
2542  *      
2543  * Return Value:        0 if success, otherwise error code
2544  */
2545 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2546 {
2547         int err;
2548         
2549         if (debug_level >= DEBUG_LEVEL_INFO)
2550                 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2551                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2552                         
2553         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2554         if (err) {
2555                 if ( debug_level >= DEBUG_LEVEL_INFO )
2556                         printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2557                                 __FILE__,__LINE__,info->device_name);
2558                 return -EFAULT;
2559         }
2560         
2561         return 0;
2562         
2563 }       /* end of mgsl_get_txidle() */
2564
2565 /* mgsl_set_txidle()    service ioctl to set transmit idle mode
2566  *      
2567  * Arguments:           info            pointer to device instance data
2568  *                      idle_mode       new idle mode
2569  *
2570  * Return Value:        0 if success, otherwise error code
2571  */
2572 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2573 {
2574         unsigned long flags;
2575  
2576         if (debug_level >= DEBUG_LEVEL_INFO)
2577                 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2578                         info->device_name, idle_mode );
2579                         
2580         spin_lock_irqsave(&info->irq_spinlock,flags);
2581         info->idle_mode = idle_mode;
2582         usc_set_txidle( info );
2583         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2584         return 0;
2585         
2586 }       /* end of mgsl_set_txidle() */
2587
2588 /* mgsl_txenable()
2589  * 
2590  *      enable or disable the transmitter
2591  *      
2592  * Arguments:
2593  * 
2594  *      info            pointer to device instance data
2595  *      enable          1 = enable, 0 = disable
2596  *
2597  * Return Value:        0 if success, otherwise error code
2598  */
2599 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2600 {
2601         unsigned long flags;
2602  
2603         if (debug_level >= DEBUG_LEVEL_INFO)
2604                 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2605                         info->device_name, enable);
2606                         
2607         spin_lock_irqsave(&info->irq_spinlock,flags);
2608         if ( enable ) {
2609                 if ( !info->tx_enabled ) {
2610
2611                         usc_start_transmitter(info);
2612                         /*--------------------------------------------------
2613                          * if HDLC/SDLC Loop mode, attempt to insert the
2614                          * station in the 'loop' by setting CMR:13. Upon
2615                          * receipt of the next GoAhead (RxAbort) sequence,
2616                          * the OnLoop indicator (CCSR:7) should go active
2617                          * to indicate that we are on the loop
2618                          *--------------------------------------------------*/
2619                         if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2620                                 usc_loopmode_insert_request( info );
2621                 }
2622         } else {
2623                 if ( info->tx_enabled )
2624                         usc_stop_transmitter(info);
2625         }
2626         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2627         return 0;
2628         
2629 }       /* end of mgsl_txenable() */
2630
2631 /* mgsl_txabort()       abort send HDLC frame
2632  *      
2633  * Arguments:           info            pointer to device instance data
2634  * Return Value:        0 if success, otherwise error code
2635  */
2636 static int mgsl_txabort(struct mgsl_struct * info)
2637 {
2638         unsigned long flags;
2639  
2640         if (debug_level >= DEBUG_LEVEL_INFO)
2641                 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2642                         info->device_name);
2643                         
2644         spin_lock_irqsave(&info->irq_spinlock,flags);
2645         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2646         {
2647                 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2648                         usc_loopmode_cancel_transmit( info );
2649                 else
2650                         usc_TCmd(info,TCmd_SendAbort);
2651         }
2652         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2653         return 0;
2654         
2655 }       /* end of mgsl_txabort() */
2656
2657 /* mgsl_rxenable()      enable or disable the receiver
2658  *      
2659  * Arguments:           info            pointer to device instance data
2660  *                      enable          1 = enable, 0 = disable
2661  * Return Value:        0 if success, otherwise error code
2662  */
2663 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2664 {
2665         unsigned long flags;
2666  
2667         if (debug_level >= DEBUG_LEVEL_INFO)
2668                 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2669                         info->device_name, enable);
2670                         
2671         spin_lock_irqsave(&info->irq_spinlock,flags);
2672         if ( enable ) {
2673                 if ( !info->rx_enabled )
2674                         usc_start_receiver(info);
2675         } else {
2676                 if ( info->rx_enabled )
2677                         usc_stop_receiver(info);
2678         }
2679         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2680         return 0;
2681         
2682 }       /* end of mgsl_rxenable() */
2683
2684 /* mgsl_wait_event()    wait for specified event to occur
2685  *      
2686  * Arguments:           info    pointer to device instance data
2687  *                      mask    pointer to bitmask of events to wait for
2688  * Return Value:        0       if successful and bit mask updated with
2689  *                              of events triggerred,
2690  *                      otherwise error code
2691  */
2692 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2693 {
2694         unsigned long flags;
2695         int s;
2696         int rc=0;
2697         struct mgsl_icount cprev, cnow;
2698         int events;
2699         int mask;
2700         struct  _input_signal_events oldsigs, newsigs;
2701         DECLARE_WAITQUEUE(wait, current);
2702
2703         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2704         if (rc) {
2705                 return  -EFAULT;
2706         }
2707                  
2708         if (debug_level >= DEBUG_LEVEL_INFO)
2709                 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2710                         info->device_name, mask);
2711
2712         spin_lock_irqsave(&info->irq_spinlock,flags);
2713
2714         /* return immediately if state matches requested events */
2715         usc_get_serial_signals(info);
2716         s = info->serial_signals;
2717         events = mask &
2718                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2719                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2720                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2721                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2722         if (events) {
2723                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2724                 goto exit;
2725         }
2726
2727         /* save current irq counts */
2728         cprev = info->icount;
2729         oldsigs = info->input_signal_events;
2730         
2731         /* enable hunt and idle irqs if needed */
2732         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2733                 u16 oldreg = usc_InReg(info,RICR);
2734                 u16 newreg = oldreg +
2735                          (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2736                          (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2737                 if (oldreg != newreg)
2738                         usc_OutReg(info, RICR, newreg);
2739         }
2740         
2741         set_current_state(TASK_INTERRUPTIBLE);
2742         add_wait_queue(&info->event_wait_q, &wait);
2743         
2744         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2745         
2746
2747         for(;;) {
2748                 schedule();
2749                 if (signal_pending(current)) {
2750                         rc = -ERESTARTSYS;
2751                         break;
2752                 }
2753                         
2754                 /* get current irq counts */
2755                 spin_lock_irqsave(&info->irq_spinlock,flags);
2756                 cnow = info->icount;
2757                 newsigs = info->input_signal_events;
2758                 set_current_state(TASK_INTERRUPTIBLE);
2759                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2760
2761                 /* if no change, wait aborted for some reason */
2762                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2763                     newsigs.dsr_down == oldsigs.dsr_down &&
2764                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2765                     newsigs.dcd_down == oldsigs.dcd_down &&
2766                     newsigs.cts_up   == oldsigs.cts_up   &&
2767                     newsigs.cts_down == oldsigs.cts_down &&
2768                     newsigs.ri_up    == oldsigs.ri_up    &&
2769                     newsigs.ri_down  == oldsigs.ri_down  &&
2770                     cnow.exithunt    == cprev.exithunt   &&
2771                     cnow.rxidle      == cprev.rxidle) {
2772                         rc = -EIO;
2773                         break;
2774                 }
2775
2776                 events = mask &
2777                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2778                         (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2779                         (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2780                         (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2781                         (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2782                         (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2783                         (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2784                         (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2785                         (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2786                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2787                 if (events)
2788                         break;
2789                 
2790                 cprev = cnow;
2791                 oldsigs = newsigs;
2792         }
2793         
2794         remove_wait_queue(&info->event_wait_q, &wait);
2795         set_current_state(TASK_RUNNING);
2796
2797         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2798                 spin_lock_irqsave(&info->irq_spinlock,flags);
2799                 if (!waitqueue_active(&info->event_wait_q)) {
2800                         /* disable enable exit hunt mode/idle rcvd IRQs */
2801                         usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2802                                 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2803                 }
2804                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2805         }
2806 exit:
2807         if ( rc == 0 )
2808                 PUT_USER(rc, events, mask_ptr);
2809                 
2810         return rc;
2811         
2812 }       /* end of mgsl_wait_event() */
2813
2814 static int modem_input_wait(struct mgsl_struct *info,int arg)
2815 {
2816         unsigned long flags;
2817         int rc;
2818         struct mgsl_icount cprev, cnow;
2819         DECLARE_WAITQUEUE(wait, current);
2820
2821         /* save current irq counts */
2822         spin_lock_irqsave(&info->irq_spinlock,flags);
2823         cprev = info->icount;
2824         add_wait_queue(&info->status_event_wait_q, &wait);
2825         set_current_state(TASK_INTERRUPTIBLE);
2826         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2827
2828         for(;;) {
2829                 schedule();
2830                 if (signal_pending(current)) {
2831                         rc = -ERESTARTSYS;
2832                         break;
2833                 }
2834
2835                 /* get new irq counts */
2836                 spin_lock_irqsave(&info->irq_spinlock,flags);
2837                 cnow = info->icount;
2838                 set_current_state(TASK_INTERRUPTIBLE);
2839                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2840
2841                 /* if no change, wait aborted for some reason */
2842                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2843                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2844                         rc = -EIO;
2845                         break;
2846                 }
2847
2848                 /* check for change in caller specified modem input */
2849                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2850                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2851                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2852                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2853                         rc = 0;
2854                         break;
2855                 }
2856
2857                 cprev = cnow;
2858         }
2859         remove_wait_queue(&info->status_event_wait_q, &wait);
2860         set_current_state(TASK_RUNNING);
2861         return rc;
2862 }
2863
2864 /* return the state of the serial control and status signals
2865  */
2866 static int tiocmget(struct tty_struct *tty, struct file *file)
2867 {
2868         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2869         unsigned int result;
2870         unsigned long flags;
2871
2872         spin_lock_irqsave(&info->irq_spinlock,flags);
2873         usc_get_serial_signals(info);
2874         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2875
2876         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2877                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2878                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2879                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2880                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2881                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2882
2883         if (debug_level >= DEBUG_LEVEL_INFO)
2884                 printk("%s(%d):%s tiocmget() value=%08X\n",
2885                          __FILE__,__LINE__, info->device_name, result );
2886         return result;
2887 }
2888
2889 /* set modem control signals (DTR/RTS)
2890  */
2891 static int tiocmset(struct tty_struct *tty, struct file *file,
2892                     unsigned int set, unsigned int clear)
2893 {
2894         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2895         unsigned long flags;
2896
2897         if (debug_level >= DEBUG_LEVEL_INFO)
2898                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2899                         __FILE__,__LINE__,info->device_name, set, clear);
2900
2901         if (set & TIOCM_RTS)
2902                 info->serial_signals |= SerialSignal_RTS;
2903         if (set & TIOCM_DTR)
2904                 info->serial_signals |= SerialSignal_DTR;
2905         if (clear & TIOCM_RTS)
2906                 info->serial_signals &= ~SerialSignal_RTS;
2907         if (clear & TIOCM_DTR)
2908                 info->serial_signals &= ~SerialSignal_DTR;
2909
2910         spin_lock_irqsave(&info->irq_spinlock,flags);
2911         usc_set_serial_signals(info);
2912         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2913
2914         return 0;
2915 }
2916
2917 /* mgsl_break()         Set or clear transmit break condition
2918  *
2919  * Arguments:           tty             pointer to tty instance data
2920  *                      break_state     -1=set break condition, 0=clear
2921  * Return Value:        None
2922  */
2923 static void mgsl_break(struct tty_struct *tty, int break_state)
2924 {
2925         struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2926         unsigned long flags;
2927         
2928         if (debug_level >= DEBUG_LEVEL_INFO)
2929                 printk("%s(%d):mgsl_break(%s,%d)\n",
2930                          __FILE__,__LINE__, info->device_name, break_state);
2931                          
2932         if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2933                 return;
2934
2935         spin_lock_irqsave(&info->irq_spinlock,flags);
2936         if (break_state == -1)
2937                 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2938         else 
2939                 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2940         spin_unlock_irqrestore(&info->irq_spinlock,flags);
2941         
2942 }       /* end of mgsl_break() */
2943
2944 /* mgsl_ioctl() Service an IOCTL request
2945  *      
2946  * Arguments:
2947  * 
2948  *      tty     pointer to tty instance data
2949  *      file    pointer to associated file object for device
2950  *      cmd     IOCTL command code
2951  *      arg     command argument/context
2952  *      
2953  * Return Value:        0 if success, otherwise error code
2954  */
2955 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2956                     unsigned int cmd, unsigned long arg)
2957 {
2958         struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2959         
2960         if (debug_level >= DEBUG_LEVEL_INFO)
2961                 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2962                         info->device_name, cmd );
2963         
2964         if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2965                 return -ENODEV;
2966
2967         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2968             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2969                 if (tty->flags & (1 << TTY_IO_ERROR))
2970                     return -EIO;
2971         }
2972
2973         return mgsl_ioctl_common(info, cmd, arg);
2974 }
2975
2976 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2977 {
2978         int error;
2979         struct mgsl_icount cnow;        /* kernel counter temps */
2980         void __user *argp = (void __user *)arg;
2981         struct serial_icounter_struct __user *p_cuser;  /* user space */
2982         unsigned long flags;
2983         
2984         switch (cmd) {
2985                 case MGSL_IOCGPARAMS:
2986                         return mgsl_get_params(info, argp);
2987                 case MGSL_IOCSPARAMS:
2988                         return mgsl_set_params(info, argp);
2989                 case MGSL_IOCGTXIDLE:
2990                         return mgsl_get_txidle(info, argp);
2991                 case MGSL_IOCSTXIDLE:
2992                         return mgsl_set_txidle(info,(int)arg);
2993                 case MGSL_IOCTXENABLE:
2994                         return mgsl_txenable(info,(int)arg);
2995                 case MGSL_IOCRXENABLE:
2996                         return mgsl_rxenable(info,(int)arg);
2997                 case MGSL_IOCTXABORT:
2998                         return mgsl_txabort(info);
2999                 case MGSL_IOCGSTATS:
3000                         return mgsl_get_stats(info, argp);
3001                 case MGSL_IOCWAITEVENT:
3002                         return mgsl_wait_event(info, argp);
3003                 case MGSL_IOCLOOPTXDONE:
3004                         return mgsl_loopmode_send_done(info);
3005                 /* Wait for modem input (DCD,RI,DSR,CTS) change
3006                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
3007                  */
3008                 case TIOCMIWAIT:
3009                         return modem_input_wait(info,(int)arg);
3010
3011                 /* 
3012                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
3013                  * Return: write counters to the user passed counter struct
3014                  * NB: both 1->0 and 0->1 transitions are counted except for
3015                  *     RI where only 0->1 is counted.
3016                  */
3017                 case TIOCGICOUNT:
3018                         spin_lock_irqsave(&info->irq_spinlock,flags);
3019                         cnow = info->icount;
3020                         spin_unlock_irqrestore(&info->irq_spinlock,flags);
3021                         p_cuser = argp;
3022                         PUT_USER(error,cnow.cts, &p_cuser->cts);
3023                         if (error) return error;
3024                         PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3025                         if (error) return error;
3026                         PUT_USER(error,cnow.rng, &p_cuser->rng);
3027                         if (error) return error;
3028                         PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3029                         if (error) return error;
3030                         PUT_USER(error,cnow.rx, &p_cuser->rx);
3031                         if (error) return error;
3032                         PUT_USER(error,cnow.tx, &p_cuser->tx);
3033                         if (error) return error;
3034                         PUT_USER(error,cnow.frame, &p_cuser->frame);
3035                         if (error) return error;
3036                         PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3037                         if (error) return error;
3038                         PUT_USER(error,cnow.parity, &p_cuser->parity);
3039                         if (error) return error;
3040                         PUT_USER(error,cnow.brk, &p_cuser->brk);
3041                         if (error) return error;
3042                         PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3043                         if (error) return error;
3044                         return 0;
3045                 default:
3046                         return -ENOIOCTLCMD;
3047         }
3048         return 0;
3049 }
3050
3051 /* mgsl_set_termios()
3052  * 
3053  *      Set new termios settings
3054  *      
3055  * Arguments:
3056  * 
3057  *      tty             pointer to tty structure
3058  *      termios         pointer to buffer to hold returned old termios
3059  *      
3060  * Return Value:                None
3061  */
3062 static void mgsl_set_termios(struct tty_struct *tty, struct termios *old_termios)
3063 {
3064         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3065         unsigned long flags;
3066         
3067         if (debug_level >= DEBUG_LEVEL_INFO)
3068                 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3069                         tty->driver->name );
3070         
3071         /* just return if nothing has changed */
3072         if ((tty->termios->c_cflag == old_termios->c_cflag)
3073             && (RELEVANT_IFLAG(tty->termios->c_iflag) 
3074                 == RELEVANT_IFLAG(old_termios->c_iflag)))
3075           return;
3076
3077         mgsl_change_params(info);
3078
3079         /* Handle transition to B0 status */
3080         if (old_termios->c_cflag & CBAUD &&
3081             !(tty->termios->c_cflag & CBAUD)) {
3082                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3083                 spin_lock_irqsave(&info->irq_spinlock,flags);
3084                 usc_set_serial_signals(info);
3085                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3086         }
3087         
3088         /* Handle transition away from B0 status */
3089         if (!(old_termios->c_cflag & CBAUD) &&
3090             tty->termios->c_cflag & CBAUD) {
3091                 info->serial_signals |= SerialSignal_DTR;
3092                 if (!(tty->termios->c_cflag & CRTSCTS) || 
3093                     !test_bit(TTY_THROTTLED, &tty->flags)) {
3094                         info->serial_signals |= SerialSignal_RTS;
3095                 }
3096                 spin_lock_irqsave(&info->irq_spinlock,flags);
3097                 usc_set_serial_signals(info);
3098                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3099         }
3100         
3101         /* Handle turning off CRTSCTS */
3102         if (old_termios->c_cflag & CRTSCTS &&
3103             !(tty->termios->c_cflag & CRTSCTS)) {
3104                 tty->hw_stopped = 0;
3105                 mgsl_start(tty);
3106         }