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- static char rcsid[] =
- "$Revision: 1.35 $$Date: 1994/12/16 13:54:18 $";
- /*
- * linux/kernel/cyclades.c
- *
- * Much of the design and some of the code came from serial.c
- * which was copyright (C) 1991, 1992 Linus Torvalds. It was
- * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
- * and then fixed as suggested by Michael K. Johnson 12/12/92.
- *
- * This version does not support shared irq's.
- *
- * This module exports the following rs232 io functions:
- * long cy_init(long);
- * int cy_open(struct tty_struct *tty, struct file *filp);
- *
- * $Log: cyclades.c,v $
- * Revision 1.35 1994/12/16 13:54:18 steffen
- * additional patch by Marcio Saito for board detection
- * Accidently left out in 1.34
- *
- * Revision 1.34 1994/12/10 12:37:12 steffen
- * This is the corrected version as suggested by Marcio Saito
- *
- * Revision 1.33 1994/12/01 22:41:18 bentson
- * add hooks to support more high speeds directly; add tytso
- * patch regarding CLOCAL wakeups
- *
- * Revision 1.32 1994/11/23 19:50:04 bentson
- * allow direct kernel control of higher signalling rates;
- * look for cards at additional locations
- *
- * Revision 1.31 1994/11/16 04:33:28 bentson
- * ANOTHER fix from Corey Minyard, minyard@wf-rch.cirr.com--
- * a problem in chars_in_buffer has been resolved by some
- * small changes; this should yield smoother output
- *
- * Revision 1.30 1994/11/16 04:28:05 bentson
- * Fix from Corey Minyard, Internet: minyard@metronet.com,
- * UUCP: minyard@wf-rch.cirr.com, WORK: minyardbnr.ca, to
- * cy_hangup that appears to clear up much (all?) of the
- * DTR glitches; also he's added/cleaned-up diagnostic messages
- *
- * Revision 1.29 1994/11/16 04:16:07 bentson
- * add change proposed by Ralph Sims, ralphs@halcyon.com, to
- * operate higher speeds in same way as other serial ports;
- * add more serial ports (for up to two 16-port muxes).
- *
- * Revision 1.28 1994/11/04 00:13:16 root
- * turn off diagnostic messages
- *
- * Revision 1.27 1994/11/03 23:46:37 root
- * bunch of changes to bring driver into greater conformance
- * with the serial.c driver (looking for missed fixes)
- *
- * Revision 1.26 1994/11/03 22:40:36 root
- * automatic interrupt probing fixed.
- *
- * Revision 1.25 1994/11/03 20:17:02 root
- * start to implement auto-irq
- *
- * Revision 1.24 1994/11/03 18:01:55 root
- * still working on modem signals--trying not to drop DTR
- * during the getty/login processes
- *
- * Revision 1.23 1994/11/03 17:51:36 root
- * extend baud rate support; set receive threshold as function
- * of baud rate; fix some problems with RTS/CTS;
- *
- * Revision 1.22 1994/11/02 18:05:35 root
- * changed arguments to udelay to type long to get
- * delays to be of correct duration
- *
- * Revision 1.21 1994/11/02 17:37:30 root
- * employ udelay (after calibrating loops_per_second earlier
- * in init/main.c) instead of using home-grown delay routines
- *
- * Revision 1.20 1994/11/02 03:11:38 root
- * cy_chars_in_buffer forces a return value of 0 to let
- * login work (don't know why it does); some functions
- * that were returning EFAULT, now executes the code;
- * more work on deciding when to disable xmit interrupts;
- *
- * Revision 1.19 1994/11/01 20:10:14 root
- * define routine to start transmission interrupts (by enabling
- * transmit interrupts); directly enable/disable modem interrupts;
- *
- * Revision 1.18 1994/11/01 18:40:45 bentson
- * Don't always enable transmit interrupts in startup; interrupt on
- * TxMpty instead of TxRdy to help characters get out before shutdown;
- * restructure xmit interrupt to check for chars first and quit if
- * none are ready to go; modem status (MXVRx) is upright, _not_ inverted
- * (to my view);
- *
- * Revision 1.17 1994/10/30 04:39:45 bentson
- * rename serial_driver and callout_driver to cy_serial_driver and
- * cy_callout_driver to avoid linkage interference; initialize
- * info->type to PORT_CIRRUS; ruggedize paranoia test; elide ->port
- * from cyclades_port structure; add paranoia check to cy_close;
- *
- * Revision 1.16 1994/10/30 01:14:33 bentson
- * change major numbers; add some _early_ return statements;
- *
- * Revision 1.15 1994/10/29 06:43:15 bentson
- * final tidying up for clean compile; enable some error reporting
- *
- * Revision 1.14 1994/10/28 20:30:22 Bentson
- * lots of changes to drag the driver towards the new tty_io
- * structures and operation. not expected to work, but may
- * compile cleanly.
- *
- * Revision 1.13 1994/07/21 23:08:57 Bentson
- * add some diagnostic cruft; support 24 lines (for testing
- * both -8Y and -16Y cards; be more thorough in servicing all
- * chips during interrupt; add "volatile" a few places to
- * circumvent compiler optimizations; fix base & offset
- * computations in block_til_ready (was causing chip 0 to
- * stop operation)
- *
- * Revision 1.12 1994/07/19 16:42:11 Bentson
- * add some hackery for kernel version 1.1.8; expand
- * error messages; refine timing for delay loops and
- * declare loop params volatile
- *
- * Revision 1.11 1994/06/11 21:53:10 bentson
- * get use of save_car right in transmit interrupt service
- *
- * Revision 1.10.1.1 1994/06/11 21:31:18 bentson
- * add some diagnostic printing; try to fix save_car stuff
- *
- * Revision 1.10 1994/06/11 20:36:08 bentson
- * clean up compiler warnings
- *
- * Revision 1.9 1994/06/11 19:42:46 bentson
- * added a bunch of code to support modem signalling
- *
- * Revision 1.8 1994/06/11 17:57:07 bentson
- * recognize break & parity error
- *
- * Revision 1.7 1994/06/05 05:51:34 bentson
- * Reorder baud table to be monotonic; add cli to CP; discard
- * incoming characters and status if the line isn't open; start to
- * fold code into cy_throttle; start to port get_serial_info,
- * set_serial_info, get_modem_info, set_modem_info, and send_break
- * from serial.c; expand cy_ioctl; relocate and expand config_setup;
- * get flow control characters from tty struct; invalidate ports w/o
- * hardware;
- *
- * Revision 1.6 1994/05/31 18:42:21 bentson
- * add a loop-breaker in the interrupt service routine;
- * note when port is initialized so that it can be shut
- * down under the right conditions; receive works without
- * any obvious errors
- *
- * Revision 1.5 1994/05/30 00:55:02 bentson
- * transmit works without obvious errors
- *
- * Revision 1.4 1994/05/27 18:46:27 bentson
- * incorporated more code from lib_y.c; can now print short
- * strings under interrupt control to port zero; seems to
- * select ports/channels/lines correctly
- *
- * Revision 1.3 1994/05/25 22:12:44 bentson
- * shifting from multi-port on a card to proper multiplexor
- * data structures; added skeletons of most routines
- *
- * Revision 1.2 1994/05/19 13:21:43 bentson
- * start to crib from other sources
- *
- */
-
- #include <linux/errno.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/tty.h>
- #include <linux/serial.h>
- #include <linux/interrupt.h>
- #include <linux/string.h>
- #include <linux/fcntl.h>
- #include <linux/ptrace.h>
- #include <linux/cyclades.h>
- #include <linux/delay.h>
- #include <linux/major.h>
- #include <linux/mm.h>
-
- #include <asm/system.h>
- #include <asm/io.h>
- #include <asm/segment.h>
- #include <asm/bitops.h>
-
- #define small_delay(x) for(j=0;j<x;j++)k++;
-
-
- #define SERIAL_PARANOIA_CHECK
- #undef SERIAL_DEBUG_OPEN
- #undef SERIAL_DEBUG_THROTTLE
- #undef SERIAL_DEBUG_OTHER
- #undef SERIAL_DEBUG_IO
- #undef SERIAL_DEBUG_COUNT
- #undef SERIAL_DEBUG_DTR
-
- #ifndef MIN
- #define MIN(a,b) ((a) < (b) ? (a) : (b))
- #endif
-
- #define WAKEUP_CHARS 256
-
- #define STD_COM_FLAGS (0)
-
- #define SERIAL_TYPE_NORMAL 1
- #define SERIAL_TYPE_CALLOUT 2
-
-
- DECLARE_TASK_QUEUE(tq_cyclades);
-
- struct tty_driver cy_serial_driver, cy_callout_driver;
-
- static volatile int cy_irq_triggered;
- static volatile int cy_triggered;
- static int cy_wild_int_mask;
- static unsigned char *intr_base_addr;
-
- /* This is the per-card data structure */
- struct cyclades_card cy_card[] = {
- /* BASE_ADDR */
- {0xD0000,0},
- {0xD2000,0},
- {0xD4000,10},
- {0xD6000,11},
- {0xD8000,12},
- {0xDA000,15}
- };
-
- #define NR_CARDS (sizeof(cy_card)/sizeof(struct cyclades_card))
-
- /* No need has yet been found for this per-chip data structure
- * struct cyclades_chip cy_chip[] = {
- * {0}
- * };
- * #define NR_CHIPS (sizeof(cy_chip)/sizeof(struct cyclades_chip))
- */
-
- /* This is the per-port data structure */
- struct cyclades_port cy_port[] = {
- /* CARD# */
- {-1 }, /* ttyC0 */
- {-1 }, /* ttyC1 */
- {-1 }, /* ttyC2 */
- {-1 }, /* ttyC3 */
- {-1 }, /* ttyC4 */
- {-1 }, /* ttyC5 */
- {-1 }, /* ttyC6 */
- {-1 }, /* ttyC7 */
- {-1 }, /* ttyC8 */
- {-1 }, /* ttyC9 */
- {-1 }, /* ttyC10 */
- {-1 }, /* ttyC11 */
- {-1 }, /* ttyC12 */
- {-1 }, /* ttyC13 */
- {-1 }, /* ttyC14 */
- {-1 }, /* ttyC15 */
- {-1 }, /* ttyC16 */
- {-1 }, /* ttyC17 */
- {-1 }, /* ttyC18 */
- {-1 }, /* ttyC19 */
- {-1 }, /* ttyC20 */
- {-1 }, /* ttyC21 */
- {-1 }, /* ttyC22 */
- {-1 }, /* ttyC23 */
- {-1 }, /* ttyC24 */
- {-1 }, /* ttyC25 */
- {-1 }, /* ttyC26 */
- {-1 }, /* ttyC27 */
- {-1 }, /* ttyC28 */
- {-1 }, /* ttyC29 */
- {-1 }, /* ttyC30 */
- {-1 } /* ttyC31 */
- };
- #define NR_PORTS (sizeof(cy_port)/sizeof(struct cyclades_port))
-
- static int serial_refcount;
-
- static struct tty_struct *serial_table[NR_PORTS];
- static struct termios *serial_termios[NR_PORTS];
- static struct termios *serial_termios_locked[NR_PORTS];
-
-
- /* This is the per-irq data structure,
- it maps an irq to the corresponding card */
- struct cyclades_card * IRQ_cards[16];
-
-
- /*
- * tmp_buf is used as a temporary buffer by serial_write. We need to
- * lock it in case the memcpy_fromfs blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
- static unsigned char *tmp_buf = 0;
- static struct semaphore tmp_buf_sem = MUTEX;
-
- /*
- * This is used to look up the divisor speeds and the timeouts
- * We're normally limited to 15 distinct baud rates. The extra
- * are accessed via settings in info->flags.
- * 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
- * 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
- * HI VHI
- */
- static int baud_table[] = {
- 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
- 1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800,115200,150000,
- 0};
-
- static char baud_co[] = { /* 25 MHz clock option table */
- /* value => 00 01 02 03 04 */
- /* divide by 8 32 128 512 2048 */
- 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
- 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-
- static char baud_bpr[] = { /* 25 MHz baud rate period table */
- 0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
- 0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15};
-
- static char baud_cor3[] = { /* receive threshold */
- 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
- 0x0a, 0x0a, 0x0a, 0x08, 0x04, 0x02, 0x01, 0x01, 0x01, 0x01};
-
-
-
- static void shutdown(struct cyclades_port *);
- static int startup (struct cyclades_port *);
- static void cy_throttle(struct tty_struct *);
- static void cy_unthrottle(struct tty_struct *);
- static void config_setup(struct cyclades_port *);
- extern void console_print(const char *);
- static void show_status(int);
-
-
-
- static inline int
- serial_paranoia_check(struct cyclades_port *info,
- dev_t device, const char *routine)
- {
- #ifdef SERIAL_PARANOIA_CHECK
- static const char *badmagic =
- "Warning: bad magic number for serial struct (%d, %d) in %s\n";
- static const char *badinfo =
- "Warning: null cyclades_port for (%d, %d) in %s\n";
- static const char *badrange =
- "Warning: cyclades_port out of range for (%d, %d) in %s\n";
-
- if (!info) {
- printk(badinfo, MAJOR(device), MINOR(device), routine);
- return 1;
- }
-
- if( (long)info < (long)(&cy_port[0])
- || (long)(&cy_port[NR_PORTS]) < (long)info ){
- printk(badrange, MAJOR(device), MINOR(device), routine);
- return 1;
- }
-
- if (info->magic != CYCLADES_MAGIC) {
- printk(badmagic, MAJOR(device), MINOR(device), routine);
- return 1;
- }
- #endif
- return 0;
- } /* serial_paranoia_check */
-
- /* The following diagnostic routines allow the driver to spew
- information on the screen, even (especially!) during interrupts.
- */
- void
- SP(char *data){
- unsigned long flags;
- save_flags(flags); cli();
- console_print(data);
- restore_flags(flags);
- }
- char scrn[2];
- void
- CP(char data){
- unsigned long flags;
- save_flags(flags); cli();
- scrn[0] = data;
- console_print(scrn);
- restore_flags(flags);
- }/* CP */
-
- void CP1(int data) { (data<10)? CP(data+'0'): CP(data+'A'-10); }/* CP1 */
- void CP2(int data) { CP1((data>>4) & 0x0f); CP1( data & 0x0f); }/* CP2 */
- void CP4(int data) { CP2((data>>8) & 0xff); CP2(data & 0xff); }/* CP4 */
- void CP8(long data) { CP4((data>>16) & 0xffff); CP4(data & 0xffff); }/* CP8 */
-
-
- /* This routine waits up to 100 micro-seconds for the previous
- command to the Cirrus chip to complete and then issues the
- new command. An error is returned if the previous command
- didn't finish within the time limit.
- */
- u_short
- write_cy_cmd(u_char *base_addr, u_char cmd)
- {
- unsigned long flags;
- volatile int i;
-
- save_flags(flags); cli();
- /* Check to see that the previous command has completed */
- for(i = 0 ; i < 10000 ; i++){
- if (base_addr[CyCCR] == 0){
- break;
- }
- udelay(10L);
- }
- /* if the CCR never cleared, the previous command
- didn't finish within the "reasonable time" */
- if ( i == 10 ) {
- restore_flags(flags);
- return (-1);
- }
-
- /* Issue the new command */
- base_addr[CyCCR] = cmd;
- restore_flags(flags);
- return(0);
- } /* write_cy_cmd */
-
-
- /* cy_start and cy_stop provide software output flow control as a
- function of XON/XOFF, software CTS, and other such stuff. */
-
- static void
- cy_stop(struct tty_struct *tty)
- {
- struct cyclades_card *cinfo;
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned char *base_addr;
- int chip,channel;
- unsigned long flags;
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_stop ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_stop"))
- return;
-
- cinfo = &cy_card[info->card];
- channel = info->line - cinfo->first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[info->card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)(channel & 0x0003); /* index channel */
- base_addr[CySRER] &= ~CyTxMpty;
- restore_flags(flags);
-
- return;
- } /* cy_stop */
-
- static void
- cy_start(struct tty_struct *tty)
- {
- struct cyclades_card *cinfo;
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned char *base_addr;
- int chip,channel;
- unsigned long flags;
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_start ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_start"))
- return;
-
- cinfo = &cy_card[info->card];
- channel = info->line - cinfo->first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[info->card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)(channel & 0x0003);
- base_addr[CySRER] |= CyTxMpty;
- restore_flags(flags);
-
- return;
- } /* cy_start */
-
-
- /*
- * This routine is used by the interrupt handler to schedule
- * processing in the software interrupt portion of the driver
- * (also known as the "bottom half"). This can be called any
- * number of times for any channel without harm.
- */
- static inline void
- cy_sched_event(struct cyclades_port *info, int event)
- {
- info->event |= 1 << event; /* remember what kind of event and who */
- queue_task_irq_off(&info->tqueue, &tq_cyclades); /* it belongs to */
- mark_bh(CYCLADES_BH); /* then trigger event */
- } /* cy_sched_event */
-
-
-
- /*
- * This interrupt routine is used
- * while we are probing for submarines.
- */
- static void
- cy_probe(int irq, struct pt_regs *regs)
- {
- cy_irq_triggered = irq;
- cy_triggered |= 1 << irq;
- return;
- } /* cy_probe */
-
- /* The real interrupt service routine is called
- whenever the card wants its hand held--chars
- received, out buffer empty, modem change, etc.
- */
- static void
- cy_interrupt(int irq, struct pt_regs *regs)
- {
- struct tty_struct *tty;
- int status;
- struct cyclades_card *cinfo;
- struct cyclades_port *info;
- volatile unsigned char *base_addr, *card_base_addr;
- int chip;
- int save_xir, channel, save_car;
- char data;
- volatile char vdata;
- int char_count;
- int outch;
- int i,j;
- int too_many;
- int had_work;
- int mdm_change;
- int mdm_status;
-
- if((cinfo = IRQ_cards[irq]) == 0){
- return; /* spurious interrupt */
- }
-
- /* This loop checks all chips in the card. Make a note whenever
- _any_ chip had some work to do, as this is considered an
- indication that there will be more to do. Only when no chip
- has any work does this outermost loop exit.
- */
- do{
- had_work = 0;
- for ( chip = 0 ; chip < cinfo->num_chips ; chip ++) {
- base_addr = (unsigned char *)(cinfo->base_addr
- + CyRegSize * chip);
- too_many = 0;
- while ( (status = base_addr[CySVRR]) != 0x00) {
- had_work++;
- /* The purpose of the following test is to ensure that
- no chip can monopolize the driver. This forces the
- chips to be checked in a round-robin fashion (after
- draining each of a bunch (1000) of characters).
- */
- if(1000<too_many++){
- break;
- }
- if (status & CySRReceive) { /* reception interrupt */
-
- /* determine the channel and change to that context */
- save_xir = (u_char) base_addr[CyRIR];
- channel = (u_short ) (save_xir & CyIRChannel);
- i = channel + chip * 4 + cinfo->first_line;
- info = &cy_port[i];
- info->last_active = jiffies;
- save_car = base_addr[CyCAR];
- base_addr[CyCAR] = save_xir;
-
- /* if there is nowhere to put the data, discard it */
- if(info->tty == 0){
- j = (base_addr[CyRIVR] & CyIVRMask);
- if ( j == CyIVRRxEx ) { /* exception */
- data = base_addr[CyRDSR];
- } else { /* normal character reception */
- char_count = base_addr[CyRDCR];
- while(char_count--){
- data = base_addr[CyRDSR];
- }
- }
- }else{ /* there is an open port for this data */
- tty = info->tty;
- j = (base_addr[CyRIVR] & CyIVRMask);
- if ( j == CyIVRRxEx ) { /* exception */
- data = base_addr[CyRDSR];
- if(data & info->ignore_status_mask){
- continue;
- }
- if (tty->flip.count < TTY_FLIPBUF_SIZE){
- tty->flip.count++;
- if (data & info->read_status_mask){
- if(data & CyBREAK){
- *tty->flip.flag_buf_ptr++ =
- TTY_BREAK;
- *tty->flip.char_buf_ptr++ =
- base_addr[CyRDSR];
- if (info->flags & ASYNC_SAK){
- do_SAK(tty);
- }
- }else if(data & CyFRAME){
- *tty->flip.flag_buf_ptr++ =
- TTY_FRAME;
- *tty->flip.char_buf_ptr++ =
- base_addr[CyRDSR];
- }else if(data & CyPARITY){
- *tty->flip.flag_buf_ptr++ =
- TTY_PARITY;
- *tty->flip.char_buf_ptr++ =
- base_addr[CyRDSR];
- }else if(data & CyOVERRUN){
- *tty->flip.flag_buf_ptr++ =
- TTY_OVERRUN;
- *tty->flip.char_buf_ptr++ = 0;
- /* If the flip buffer itself is
- overflowing, we still loose
- the next incoming character.
- */
- if(tty->flip.count < TTY_FLIPBUF_SIZE){
- tty->flip.count++;
- *tty->flip.flag_buf_ptr++ =
- TTY_NORMAL;
- *tty->flip.char_buf_ptr++ =
- base_addr[CyRDSR];
- }
- /* These two conditions may imply */
- /* a normal read should be done. */
- /* }else if(data & CyTIMEOUT){ */
- /* }else if(data & CySPECHAR){ */
- }else{
- *tty->flip.flag_buf_ptr++ = 0;
- *tty->flip.char_buf_ptr++ = 0;
- }
- }else{
- *tty->flip.flag_buf_ptr++ = 0;
- *tty->flip.char_buf_ptr++ = 0;
- }
- }else{
- /* there was a software buffer overrun
- and nothing could be done about it!!! */
- }
- } else { /* normal character reception */
- /* load # characters available from the chip */
- char_count = base_addr[CyRDCR];
-
- while(char_count--){
- if (tty->flip.count >= TTY_FLIPBUF_SIZE){
- break;
- }
- tty->flip.count++;
- data = base_addr[CyRDSR];
- *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
- *tty->flip.char_buf_ptr++ = data;
- }
- }
- queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
- }
- /* end of service */
- base_addr[CyRIR] = (save_xir & 0x3f);
- base_addr[CyCAR] = (save_car);
- }
-
-
- if (status & CySRTransmit) { /* transmission interrupt */
- /* Since we only get here when the transmit buffer is empty,
- we know we can always stuff a dozen characters. */
-
- /* determine the channel and change to that context */
- save_xir = (u_char) base_addr[CyTIR];
- channel = (u_short ) (save_xir & CyIRChannel);
- i = channel + chip * 4 + cinfo->first_line;
- save_car = base_addr[CyCAR];
- base_addr[CyCAR] = save_xir;
-
- /* validate the port number (as configured and open) */
- if( (i < 0) || (NR_PORTS <= i) ){
- base_addr[CySRER] &= ~CyTxMpty;
- goto txend;
- }
- info = &cy_port[i];
- info->last_active = jiffies;
- if(info->tty == 0){
- base_addr[CySRER] &= ~CyTxMpty;
- goto txdone;
- }
-
- /* load the on-chip space available for outbound data */
- char_count = info->xmit_fifo_size;
-
-
- if(info->x_char) { /* send special char */
- outch = info->x_char;
- base_addr[CyTDR] = outch;
- char_count--;
- info->x_char = 0;
- }
-
- if (info->x_break){
- /* The Cirrus chip requires the "Embedded Transmit
- Commands" of start break, delay, and end break
- sequences to be sent. The duration of the
- break is given in TICs, which runs at HZ
- (typically 100) and the PPR runs at 200 Hz,
- so the delay is duration * 200/HZ, and thus a
- break can run from 1/100 sec to about 5/4 sec.
- */
- base_addr[CyTDR] = 0; /* start break */
- base_addr[CyTDR] = 0x81;
- base_addr[CyTDR] = 0; /* delay a bit */
- base_addr[CyTDR] = 0x82;
- base_addr[CyTDR] = info->x_break*200/HZ;
- base_addr[CyTDR] = 0; /* terminate break */
- base_addr[CyTDR] = 0x83;
- char_count -= 7;
- info->x_break = 0;
- }
-
- while (char_count-- > 0){
- if (!info->xmit_cnt){
- base_addr[CySRER] &= ~CyTxMpty;
- goto txdone;
- }
- if (info->tty->stopped || info->tty->hw_stopped){
- base_addr[CySRER] &= ~CyTxMpty;
- goto txdone;
- }
- /* Because the Embedded Transmit Commands have been
- enabled, we must check to see if the escape
- character, NULL, is being sent. If it is, we
- must ensure that there is room for it to be
- doubled in the output stream. Therefore we
- no longer advance the pointer when the character
- is fetched, but rather wait until after the check
- for a NULL output character. (This is necessary
- because there may not be room for the two chars
- needed to send a NULL.
- */
- outch = info->xmit_buf[info->xmit_tail];
- if( outch ){
- info->xmit_cnt--;
- info->xmit_tail = (info->xmit_tail + 1)
- & (PAGE_SIZE - 1);
- base_addr[CyTDR] = outch;
- }else{
- if(char_count > 1){
- info->xmit_cnt--;
- info->xmit_tail = (info->xmit_tail + 1)
- & (PAGE_SIZE - 1);
- base_addr[CyTDR] = outch;
- base_addr[CyTDR] = 0;
- char_count--;
- }else{
- }
- }
- }
-
- txdone:
- if (info->xmit_cnt < WAKEUP_CHARS) {
- cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
- }
-
- txend:
- /* end of service */
- base_addr[CyTIR] = (save_xir & 0x3f);
- base_addr[CyCAR] = (save_car);
- }
-
- if (status & CySRModem) { /* modem interrupt */
-
- /* determine the channel and change to that context */
- save_xir = (u_char) base_addr[CyMIR];
- channel = (u_short ) (save_xir & CyIRChannel);
- info = &cy_port[channel + chip * 4 + cinfo->first_line];
- info->last_active = jiffies;
- save_car = base_addr[CyCAR];
- base_addr[CyCAR] = save_xir;
-
- mdm_change = base_addr[CyMISR];
- mdm_status = base_addr[CyMSVR1];
-
- if(info->tty == 0){ /* nowhere to put the data, ignore it */
- ;
- }else{
- if((mdm_change & CyDCD)
- && (info->flags & ASYNC_CHECK_CD)){
- if(mdm_status & CyDCD){
- /* CP('!'); */
- cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
- }else if(!((info->flags & ASYNC_CALLOUT_ACTIVE)
- &&(info->flags & ASYNC_CALLOUT_NOHUP))){
- /* CP('@'); */
- cy_sched_event(info, Cy_EVENT_HANGUP);
- }
- }
- if((mdm_change & CyCTS)
- && (info->flags & ASYNC_CTS_FLOW)){
- if(info->tty->stopped){
- if(mdm_status & CyCTS){
- /* !!! cy_start isn't used because... */
- info->tty->stopped = 0;
- base_addr[CySRER] |= CyTxMpty;
- cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
- }
- }else{
- if(!(mdm_status & CyCTS)){
- /* !!! cy_stop isn't used because... */
- info->tty->stopped = 1;
- base_addr[CySRER] &= ~CyTxMpty;
- }
- }
- }
- if(mdm_status & CyDSR){
- }
- if(mdm_status & CyRI){
- }
- }
- /* end of service */
- base_addr[CyMIR] = (save_xir & 0x3f);
- base_addr[CyCAR] = save_car;
- }
- } /* end while status != 0 */
- } /* end loop for chips... */
- } while(had_work);
-
- /* clear interrupts */
- card_base_addr = (unsigned char *)cinfo->base_addr;
- vdata = *(card_base_addr + Cy_ClrIntr); /* Cy_ClrIntr is 0x1800 */
-
- } /* cy_interrupt */
-
- /*
- * This routine is used to handle the "bottom half" processing for the
- * serial driver, known also the "software interrupt" processing.
- * This processing is done at the kernel interrupt level, after the
- * cy_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
- * is where time-consuming activities which can not be done in the
- * interrupt driver proper are done; the interrupt driver schedules
- * them using cy_sched_event(), and they get done here.
- *
- * This is done through one level of indirection--the task queue.
- * When a hardware interrupt service routine wants service by the
- * driver's bottom half, it enqueues the appropriate tq_struct (one
- * per port) to the tq_cyclades work queue and sets a request flag
- * via mark_bh for processing that queue. When the time is right,
- * do_cyclades_bh is called (because of the mark_bh) and it requests
- * that the work queue be processed.
- *
- * Although this may seem unwieldy, it gives the system a way to
- * pass an argument (in this case the pointer to the cyclades_port
- * structure) to the bottom half of the driver. Previous kernels
- * had to poll every port to see if that port needed servicing.
- */
- static void
- do_cyclades_bh(void *unused)
- {
- run_task_queue(&tq_cyclades);
- } /* do_cyclades_bh */
-
- static void
- do_softint(void *private_)
- {
- struct cyclades_port *info = (struct cyclades_port *) private_;
- struct tty_struct *tty;
-
- tty = info->tty;
- if (!tty)
- return;
-
- if (clear_bit(Cy_EVENT_HANGUP, &info->event)) {
- tty_hangup(info->tty);
- wake_up_interruptible(&info->open_wait);
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|
- ASYNC_CALLOUT_ACTIVE);
- }
- if (clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
- wake_up_interruptible(&info->open_wait);
- }
- if (clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) {
- if((tty->flags & (1<< TTY_DO_WRITE_WAKEUP))
- && tty->ldisc.write_wakeup){
- (tty->ldisc.write_wakeup)(tty);
- }
- wake_up_interruptible(&tty->write_wait);
- }
- } /* do_softint */
-
-
- /*
- * Grab all interrupts in preparation for doing an automatic irq
- * detection. dontgrab is a mask of irq's _not_ to grab. Returns a
- * mask of irq's which were grabbed and should therefore be freed
- * using free_all_interrupts().
- */
- static int
- grab_all_interrupts(int dontgrab)
- {
- int irq_lines = 0;
- int i, mask;
-
- for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
- if (!(mask & dontgrab)
- && !request_irq(i, cy_probe, SA_INTERRUPT, "serial probe")) {
- irq_lines |= mask;
- }
- }
- return irq_lines;
- } /* grab_all_interrupts */
-
- /*
- * Release all interrupts grabbed by grab_all_interrupts
- */
- static void
- free_all_interrupts(int irq_lines)
- {
- int i;
-
- for (i = 0; i < 16; i++) {
- if (irq_lines & (1 << i))
- free_irq(i);
- }
- } /* free_all_interrupts */
-
- /*
- * This routine returns a bitfield of "wild interrupts". Basically,
- * any unclaimed interrupts which is flapping around.
- */
- static int
- check_wild_interrupts(void)
- {
- int i, mask;
- int wild_interrupts = 0;
- int irq_lines;
- unsigned long timeout;
- unsigned long flags;
-
- /*Turn on interrupts (they may be off) */
- save_flags(flags); sti();
-
- irq_lines = grab_all_interrupts(0);
-
- /*
- * Delay for 0.1 seconds -- we use a busy loop since this may
- * occur during the bootup sequence
- */
- timeout = jiffies+10;
- while (timeout >= jiffies)
- ;
-
- cy_triggered = 0; /* Reset after letting things settle */
-
- timeout = jiffies+10;
- while (timeout >= jiffies)
- ;
-
- for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
- if ((cy_triggered & (1 << i)) &&
- (irq_lines & (1 << i))) {
- wild_interrupts |= mask;
- }
- }
- free_all_interrupts(irq_lines);
- restore_flags(flags);
- return wild_interrupts;
- } /* check_wild_interrupts */
-
- /*
- * This routine is called by do_auto_irq(); it attempts to determine
- * which interrupt a serial port is configured to use. It is not
- * fool-proof, but it works a large part of the time.
- */
- static int
- get_auto_irq(int card)
- {
- unsigned long timeout;
- unsigned char *base_addr;
- int save_xir, save_car;
- volatile char vdata;
-
- base_addr = (unsigned char*) (cy_card[card].base_addr);
- intr_base_addr = base_addr;
-
- /*
- * Enable interrupts and see who answers
- */
- cy_irq_triggered = 0;
- cli();
- base_addr[CyCAR] = 0;
- write_cy_cmd(base_addr,CyCHAN_CTL|CyENB_XMTR);
- base_addr[CySRER] |= CyTxMpty;
- sti();
-
- timeout = jiffies+2;
- while (timeout >= jiffies) {
- if (cy_irq_triggered)
- break;
- }
- /*
- * Now check to see if we got any business, and clean up.
- */
- cli();
- if(intr_base_addr[CySVRR] != 0){
- save_xir = (u_char) intr_base_addr[CyTIR];
- save_car = intr_base_addr[CyCAR];
- if ((save_xir & 0x3) != 0){
- printk("channel %x requesting unexpected interrupt\n",save_xir);
- }
- intr_base_addr[CyCAR] = (save_xir & 0x3);
- intr_base_addr[CySRER] &= ~CyTxMpty;
- intr_base_addr[CyTIR] = (save_xir & 0x3f);
- intr_base_addr[CyCAR] = (save_car);
- vdata = *(intr_base_addr + Cy_ClrIntr); /* Cy_ClrIntr is 0x1800 */
- }
- sti();
-
- return(cy_irq_triggered);
- } /* get_auto_irq */
-
- /*
- * Calls get_auto_irq() multiple times, to make sure we don't get
- * faked out by random interrupts
- */
- static int
- do_auto_irq(int card)
- {
- int irq_lines = 0;
- int irq_try_1 = 0, irq_try_2 = 0;
- int retries;
- unsigned long flags;
-
- /* Turn on interrupts (they may be off) */
- save_flags(flags); sti();
-
- cy_wild_int_mask = check_wild_interrupts();
-
- irq_lines = grab_all_interrupts(cy_wild_int_mask);
-
- for (retries = 0; retries < 5; retries++) {
- if (!irq_try_1)
- irq_try_1 = get_auto_irq(card);
- if (!irq_try_2)
- irq_try_2 = get_auto_irq(card);
- if (irq_try_1 && irq_try_2) {
- if (irq_try_1 == irq_try_2)
- break;
- irq_try_1 = irq_try_2 = 0;
- }
- }
- restore_flags(flags);
- free_all_interrupts(irq_lines);
- return (irq_try_1 == irq_try_2) ? irq_try_1 : 0;
- } /* do_auto_irq */
-
-
- /* This is called whenever a port becomes active;
- interrupts are enabled and DTR & RTS are turned on.
- */
- static int
- startup(struct cyclades_port * info)
- {
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- if (info->flags & ASYNC_INITIALIZED){
- return 0;
- }
-
- if (!info->type){
- if (info->tty){
- set_bit(TTY_IO_ERROR, &info->tty->flags);
- }
- return 0;
- }
- if (!info->xmit_buf){
- info->xmit_buf = (unsigned char *) get_free_page (GFP_KERNEL);
- if (!info->xmit_buf){
- return -ENOMEM;
- }
- }
-
- config_setup(info);
-
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- #ifdef SERIAL_DEBUG_OPEN
- printk("startup card %d, chip %d, channel %d, base_addr %lx",
- card, chip, channel, (long)base_addr);/**/
- #endif
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
-
- base_addr[CyRTPR] = 0x20; /* 32ms rx timeout */
-
- write_cy_cmd(base_addr,CyCHAN_CTL|CyENB_RCVR|CyENB_XMTR);
-
- base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
- base_addr[CyMSVR1] = CyRTS;
- /* CP('S');CP('1'); */
- base_addr[CyMSVR2] = CyDTR;
-
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: raising DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
-
- base_addr[CySRER] |= CyRxData;
- info->flags |= ASYNC_INITIALIZED;
-
- if (info->tty){
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- }
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-
- restore_flags(flags);
-
- #ifdef SERIAL_DEBUG_OPEN
- printk(" done\n");
- #endif
- return 0;
- } /* startup */
-
- void
- start_xmit( struct cyclades_port *info )
- {
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
- save_flags(flags); cli();
- base_addr[CyCAR] = channel;
- base_addr[CySRER] |= CyTxMpty;
- restore_flags(flags);
- } /* start_xmit */
-
- /*
- * This routine shuts down a serial port; interrupts are disabled,
- * and DTR is dropped if the hangup on close termio flag is on.
- */
- static void
- shutdown(struct cyclades_port * info)
- {
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- if (!(info->flags & ASYNC_INITIALIZED)){
- /* CP('$'); */
- return;
- }
-
- card = info->card;
- channel = info->line - cy_card[card].first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- #ifdef SERIAL_DEBUG_OPEN
- printk("shutdown card %d, chip %d, channel %d, base_addr %lx\n",
- card, chip, channel, (long)base_addr);
- #endif
-
- /* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
- SENT BEFORE DROPPING THE LINE !!! (Perhaps
- set some flag that is read when XMTY happens.)
- Other choices are to delay some fixed interval
- or schedule some later processing.
- */
- save_flags(flags); cli();
- if (info->xmit_buf){
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = 0;
- }
-
- base_addr[CyCAR] = (u_char)channel;
- if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
- base_addr[CyMSVR1] = ~CyRTS;
- /* CP('C');CP('1'); */
- base_addr[CyMSVR2] = ~CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: dropping DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- }
- write_cy_cmd(base_addr,CyCHAN_CTL|CyDIS_RCVR);
- /* it may be appropriate to clear _XMIT at
- some later date (after testing)!!! */
-
- if (info->tty){
- set_bit(TTY_IO_ERROR, &info->tty->flags);
- }
- info->flags &= ~ASYNC_INITIALIZED;
- restore_flags(flags);
-
- #ifdef SERIAL_DEBUG_OPEN
- printk(" done\n");
- #endif
- return;
- } /* shutdown */
-
- /*
- * This routine finds or computes the various line characteristics.
- */
- static void
- config_setup(struct cyclades_port * info)
- {
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
- unsigned cflag;
- int i;
-
- if (!info->tty || !info->tty->termios){
- return;
- }
- if (info->line == -1){
- return;
- }
- cflag = info->tty->termios->c_cflag;
-
- /* baud rate */
- i = cflag & CBAUD;
- #ifdef CBAUDEX
- /* Starting with kernel 1.1.65, there is direct support for
- higher baud rates. The following code supports those
- changes. The conditional aspect allows this driver to be
- used for earlier as well as later kernel versions. (The
- mapping is slightly different from serial.c because there
- is still the possibility of supporting 75 kbit/sec with
- the Cyclades board.)
- */
- if (i & CBAUDEX) {
- if (i == B57600)
- i = 16;
- else if(i == B115200)
- i = 18;
- #ifdef B78600
- else if(i == B78600)
- i = 17;
- #endif
- else
- info->tty->termios->c_cflag &= ~CBAUDEX;
- }
- #endif
- if (i == 15) {
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- i += 1;
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- i += 3;
- }
- info->tbpr = baud_bpr[i]; /* Tx BPR */
- info->tco = baud_co[i]; /* Tx CO */
- info->rbpr = baud_bpr[i]; /* Rx BPR */
- info->rco = baud_co[i]; /* Rx CO */
- if (baud_table[i] == 134) {
- info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
- /* get it right for 134.5 baud */
- } else if (baud_table[i]) {
- info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
- /* this needs to be propagated into the card info */
- } else {
- info->timeout = 0;
- }
- /* By tradition (is it a standard?) a baud rate of zero
- implies the line should be/has been closed. A bit
- later in this routine such a test is performed. */
-
- /* byte size and parity */
- info->cor5 = 0;
- info->cor4 = 0;
- info->cor3 = baud_cor3[i]; /* receive threshold */
- info->cor2 = CyETC;
- switch(cflag & CSIZE){
- case CS5:
- info->cor1 = Cy_5_BITS;
- break;
- case CS6:
- info->cor1 = Cy_6_BITS;
- break;
- case CS7:
- info->cor1 = Cy_7_BITS;
- break;
- case CS8:
- info->cor1 = Cy_8_BITS;
- break;
- }
- if(cflag & CSTOPB){
- info->cor1 |= Cy_2_STOP;
- }
- if (cflag & PARENB){
- if (cflag & PARODD){
- info->cor1 |= CyPARITY_O;
- }else{
- info->cor1 |= CyPARITY_E;
- }
- }else{
- info->cor1 |= CyPARITY_NONE;
- }
-
- /* CTS flow control flag */
- if (cflag & CRTSCTS)
- info->flags |= ASYNC_CTS_FLOW;
- else
- info->flags &= ~ASYNC_CTS_FLOW;
- if (cflag & CLOCAL)
- info->flags &= ~ASYNC_CHECK_CD;
- else
- info->flags |= ASYNC_CHECK_CD;
-
-
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
-
- /* tx and rx baud rate */
-
- base_addr[CyTCOR] = info->tco;
- base_addr[CyTBPR] = info->tbpr;
- base_addr[CyRCOR] = info->rco;
- base_addr[CyRBPR] = info->rbpr;
-
- /* set line characteristics according configuration */
-
- base_addr[CySCHR1] = START_CHAR(info->tty);
- base_addr[CySCHR2] = STOP_CHAR(info->tty);
- base_addr[CyCOR1] = info->cor1;
- base_addr[CyCOR2] = info->cor2;
- base_addr[CyCOR3] = info->cor3;
- base_addr[CyCOR4] = info->cor4;
- base_addr[CyCOR5] = info->cor5;
-
- write_cy_cmd(base_addr,CyCOR_CHANGE|CyCOR1ch|CyCOR2ch|CyCOR3ch);
-
- base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
-
- base_addr[CyRTPR] = 0x20; /* 32ms rx timeout */
-
- if (C_CLOCAL(info->tty)) {
- base_addr[CySRER] |= 0; /* without modem intr */
- /* ignore 1->0 modem transitions */
- base_addr[CyMCOR1] = 0x0;
- /* ignore 0->1 modem transitions */
- base_addr[CyMCOR2] = 0x0;
- } else {
- base_addr[CySRER] |= CyMdmCh; /* with modem intr */
- /* act on 1->0 modem transitions */
- base_addr[CyMCOR1] = CyDSR|CyCTS|CyRI|CyDCD;
- /* act on 0->1 modem transitions */
- base_addr[CyMCOR2] = CyDSR|CyCTS|CyRI|CyDCD;
- }
-
- if(i == 0){ /* baud rate is zero, turn off line */
- base_addr[CyMSVR2] = ~CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: dropping DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- }else{
- base_addr[CyMSVR2] = CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: raising DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- }
-
- /* The hardware option, CyRtsAO, presents RTS when
- the chip has characters to send. Since most modems
- use RTS as reverse (inbound) flow control, this
- option is not used. If inbound flow control is
- necessary, DTR can be programmed to provide the
- appropriate signals. Contact Marcio Saito for
- details. */
- if (C_CRTSCTS(info->tty)) {
- info->cor2 |= CyCtsAE;
- }else{
- info->cor2 &= ~CyCtsAE;
- }
-
- if (info->tty){
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- }
-
- restore_flags(flags);
-
- } /* config_setup */
-
-
- static void
- cy_put_char(struct tty_struct *tty, unsigned char ch)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_put_char ttyC%d\n", info->line);
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_put_char"))
- return;
-
- if (!tty || !info->xmit_buf)
- return;
-
- save_flags(flags); cli();
- if (info->xmit_cnt >= PAGE_SIZE - 1) {
- restore_flags(flags);
- return;
- }
-
- info->xmit_buf[info->xmit_head++] = ch;
- info->xmit_head &= PAGE_SIZE - 1;
- info->xmit_cnt++;
- restore_flags(flags);
- } /* cy_put_char */
-
-
- static void
- cy_flush_chars(struct tty_struct *tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_flush_chars ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_flush_chars"))
- return;
-
- if (info->xmit_cnt <= 0 || tty->stopped
- || tty->hw_stopped || !info->xmit_buf)
- return;
-
- card = info->card;
- channel = info->line - cy_card[card].first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = channel;
- base_addr[CySRER] |= CyTxMpty;
- restore_flags(flags);
- } /* cy_flush_chars */
-
-
- /* This routine gets called when tty_write has put something into
- the write_queue. If the port is not already transmitting stuff,
- start it off by enabling interrupts. The interrupt service
- routine will then ensure that the characters are sent. If the
- port is already active, there is no need to kick it.
- */
- static int
- cy_write(struct tty_struct * tty, int from_user,
- unsigned char *buf, int count)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
- int c, total = 0;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_write ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_write")){
- return 0;
- }
-
- if (!tty || !info->xmit_buf || !tmp_buf){
- return 0;
- }
-
- while (1) {
- save_flags(flags); cli();
- c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- if (c <= 0){
- restore_flags(flags);
- break;
- }
-
- if (from_user) {
- down(&tmp_buf_sem);
- memcpy_fromfs(tmp_buf, buf, c);
- c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
- up(&tmp_buf_sem);
- } else
- memcpy(info->xmit_buf + info->xmit_head, buf, c);
- info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt += c;
- restore_flags(flags);
- buf += c;
- count -= c;
- total += c;
- }
-
-
- if (info->xmit_cnt
- && !tty->stopped
- && !tty->hw_stopped ) {
- start_xmit(info);
- }
- return total;
- } /* cy_write */
-
-
- static int
- cy_write_room(struct tty_struct *tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- int ret;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_write_room ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_write_room"))
- return 0;
- ret = PAGE_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- return ret;
- } /* cy_write_room */
-
-
- static int
- cy_chars_in_buffer(struct tty_struct *tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_chars_in_buffer ttyC%d %d\n", info->line, info->xmit_cnt); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_chars_in_buffer"))
- return 0;
-
- return info->xmit_cnt;
- } /* cy_chars_in_buffer */
-
-
- static void
- cy_flush_buffer(struct tty_struct *tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
-
- #ifdef SERIAL_DEBUG_IO
- printk("cy_flush_buffer ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_flush_buffer"))
- return;
- save_flags(flags); cli();
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- restore_flags(flags);
- wake_up_interruptible(&tty->write_wait);
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
- && tty->ldisc.write_wakeup)
- (tty->ldisc.write_wakeup)(tty);
- } /* cy_flush_buffer */
-
-
- /* This routine is called by the upper-layer tty layer to signal
- that incoming characters should be throttled or that the
- throttle should be released.
- */
- static void
- cy_throttle(struct tty_struct * tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- #ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("throttle %s: %d....\n", _tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
- printk("cy_throttle ttyC%d\n", info->line);
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_nthrottle")){
- return;
- }
-
- if (I_IXOFF(tty)) {
- info->x_char = STOP_CHAR(tty);
- /* Should use the "Send Special Character" feature!!! */
- }
-
- card = info->card;
- channel = info->line - cy_card[card].first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = ~CyRTS;
- restore_flags(flags);
-
- return;
- } /* cy_throttle */
-
-
- static void
- cy_unthrottle(struct tty_struct * tty)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
- unsigned long flags;
- unsigned char *base_addr;
- int card,chip,channel;
-
- #ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("throttle %s: %d....\n", _tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
- printk("cy_unthrottle ttyC%d\n", info->line);
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_nthrottle")){
- return;
- }
-
- if (I_IXOFF(tty)) {
- info->x_char = START_CHAR(tty);
- /* Should use the "Send Special Character" feature!!! */
- }
-
- card = info->card;
- channel = info->line - cy_card[card].first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = CyRTS;
- restore_flags(flags);
-
- return;
- } /* cy_unthrottle */
-
- static int
- get_serial_info(struct cyclades_port * info,
- struct serial_struct * retinfo)
- {
- struct serial_struct tmp;
- struct cyclades_card *cinfo = &cy_card[info->card];
-
- /* CP('g'); */
- if (!retinfo)
- return -EFAULT;
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = info->type;
- tmp.line = info->line;
- tmp.port = info->card * 0x100 + info->line - cinfo->first_line;
- tmp.irq = cinfo->irq;
- tmp.flags = info->flags;
- tmp.baud_base = 0; /*!!!*/
- tmp.close_delay = info->close_delay;
- tmp.custom_divisor = 0; /*!!!*/
- tmp.hub6 = 0; /*!!!*/
- memcpy_tofs(retinfo,&tmp,sizeof(*retinfo));
- return 0;
- } /* get_serial_info */
-
- static int
- set_serial_info(struct cyclades_port * info,
- struct serial_struct * new_info)
- {
- struct serial_struct new_serial;
- struct cyclades_port old_info;
-
- /* CP('s'); */
- if (!new_info)
- return -EFAULT;
- memcpy_fromfs(&new_serial,new_info,sizeof(new_serial));
- old_info = *info;
-
- if (!suser()) {
- if ((new_serial.close_delay != info->close_delay) ||
- ((new_serial.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK) !=
- (info->flags & ASYNC_FLAGS & ~ASYNC_USR_MASK)))
- return -EPERM;
- info->flags = ((info->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- goto check_and_exit;
- }
-
-
- /*
- * OK, past this point, all the error checking has been done.
- * At this point, we start making changes.....
- */
-
- info->flags = ((info->flags & ~ASYNC_FLAGS) |
- (new_serial.flags & ASYNC_FLAGS));
- info->close_delay = new_serial.close_delay;
-
-
- check_and_exit:
- if (info->flags & ASYNC_INITIALIZED){
- config_setup(info);
- return 0;
- }else{
- return startup(info);
- }
- } /* set_serial_info */
-
- static int
- get_modem_info(struct cyclades_port * info, unsigned int *value)
- {
- int card,chip,channel;
- unsigned char *base_addr;
- unsigned long flags;
- unsigned char status;
- unsigned int result;
-
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- status = base_addr[CyMSVR1] | base_addr[CyMSVR2];
- restore_flags(flags);
-
- result = ((status & CyRTS) ? TIOCM_RTS : 0)
- | ((status & CyDTR) ? TIOCM_DTR : 0)
- | ((status & CyDCD) ? TIOCM_CAR : 0)
- | ((status & CyRI) ? TIOCM_RNG : 0)
- | ((status & CyDSR) ? TIOCM_DSR : 0)
- | ((status & CyCTS) ? TIOCM_CTS : 0);
- put_fs_long(result,(unsigned long *) value);
- return 0;
- } /* get_modem_info */
-
- static int
- set_modem_info(struct cyclades_port * info, unsigned int cmd,
- unsigned int *value)
- {
- int card,chip,channel;
- unsigned char *base_addr;
- unsigned long flags;
- unsigned int arg = get_fs_long((unsigned long *) value);
-
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = CyRTS;
- restore_flags(flags);
- }
- if (arg & TIOCM_DTR){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- /* CP('S');CP('2'); */
- base_addr[CyMSVR2] = CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: raising DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- restore_flags(flags);
- }
- break;
- case TIOCMBIC:
- if (arg & TIOCM_RTS){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = ~CyRTS;
- restore_flags(flags);
- }
- if (arg & TIOCM_DTR){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- /* CP('C');CP('2'); */
- base_addr[CyMSVR2] = ~CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: dropping DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- restore_flags(flags);
- }
- break;
- case TIOCMSET:
- if (arg & TIOCM_RTS){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = CyRTS;
- restore_flags(flags);
- }else{
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = ~CyRTS;
- restore_flags(flags);
- }
- if (arg & TIOCM_DTR){
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- /* CP('S');CP('3'); */
- base_addr[CyMSVR2] = CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: raising DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- restore_flags(flags);
- }else{
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- /* CP('C');CP('3'); */
- base_addr[CyMSVR2] = ~CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: dropping DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- restore_flags(flags);
- }
- break;
- default:
- return -EINVAL;
- }
- return 0;
- } /* set_modem_info */
-
- static void
- send_break( struct cyclades_port * info, int duration)
- { /* Let the transmit ISR take care of this (since it
- requires stuffing characters into the output stream).
- */
- info->x_break = duration;
- if (!info->xmit_cnt ) {
- start_xmit(info);
- }
- } /* send_break */
-
-
- static int
- cy_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
- {
- int error;
- struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
- int ret_val = 0;
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_ioctl ttyC%d, cmd = %x arg = %lx\n", info->line, cmd, arg); /* */
- #endif
-
- switch (cmd) {
- case TCSBRK: /* SVID version: non-zero arg --> no break */
- ret_val = tty_check_change(tty);
- if (ret_val)
- return ret_val;
- tty_wait_until_sent(tty,0);
- if (!arg)
- send_break(info, HZ/4); /* 1/4 second */
- break;
- case TCSBRKP: /* support for POSIX tcsendbreak() */
- ret_val = tty_check_change(tty);
- if (ret_val)
- return ret_val;
- tty_wait_until_sent(tty,0);
- send_break(info, arg ? arg*(HZ/10) : HZ/4);
- break;
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- ret_val = set_modem_info(info, cmd, (unsigned int *) arg);
-
- /* The following commands are incompletely implemented!!! */
- case TIOCGSOFTCAR:
- error = verify_area(VERIFY_WRITE, (void *) arg
- ,sizeof(unsigned int *));
- if (error){
- ret_val = error;
- break;
- }
- put_fs_long(C_CLOCAL(tty) ? 1 : 0,
- (unsigned long *) arg);
- break;
- case TIOCSSOFTCAR:
- arg = get_fs_long((unsigned long *) arg);
- tty->termios->c_cflag =
- ((tty->termios->c_cflag & ~CLOCAL) |
- (arg ? CLOCAL : 0));
- break;
- case TIOCMGET:
- error = verify_area(VERIFY_WRITE, (void *) arg
- ,sizeof(unsigned int *));
- if (error){
- ret_val = error;
- break;
- }
- ret_val = get_modem_info(info, (unsigned int *) arg);
- break;
- case TIOCGSERIAL:
- error = verify_area(VERIFY_WRITE, (void *) arg
- ,sizeof(struct serial_struct));
- if (error){
- ret_val = error;
- break;
- }
- ret_val = get_serial_info(info,
- (struct serial_struct *) arg);
- break;
- case TIOCSSERIAL:
- ret_val = set_serial_info(info,
- (struct serial_struct *) arg);
- break;
- default:
- ret_val = -ENOIOCTLCMD;
- }
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_ioctl done\n");
- #endif
-
- return ret_val;
- } /* cy_ioctl */
-
-
-
-
- static void
- cy_set_termios(struct tty_struct *tty, struct termios * old_termios)
- {
- struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_set_termios ttyC%d\n", info->line);
- #endif
-
- if (tty->termios->c_cflag == old_termios->c_cflag)
- return;
- config_setup(info);
-
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(tty->termios->c_cflag & CRTSCTS)) {
- tty->stopped = 0;
- cy_start(tty);
- }
- #ifdef tytso_patch_94Nov25_1726
- if (!(old_termios->c_cflag & CLOCAL) &&
- (tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&info->open_wait);
- #endif
-
- return;
- } /* cy_set_termios */
-
-
- static void
- cy_close(struct tty_struct * tty, struct file * filp)
- {
- struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
-
- /* CP('C'); */
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_close ttyC%d\n", info->line);
- #endif
-
- if (!info
- || serial_paranoia_check(info, tty->device, "cy_close")){
- return;
- }
- #ifdef SERIAL_DEBUG_OPEN
- printk("cy_close ttyC%d, count = %d\n", info->line, info->count);
- #endif
-
- if ((tty->count == 1) && (info->count != 1)) {
- /*
- * Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. Info->count should always
- * be one in these conditions. If it's greater than
- * one, we've got real problems, since it means the
- * serial port won't be shutdown.
- */
- printk("cy_close: bad serial port count; tty->count is 1, "
- "info->count is %d\n", info->count);
- info->count = 1;
- }
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count - 1);
- #endif
- if (--info->count < 0) {
- printk("cy_close: bad serial port count for ttys%d: %d\n",
- info->line, info->count);
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: setting count to 0\n", __LINE__);
- #endif
- info->count = 0;
- }
- if (info->count)
- return;
- info->flags |= ASYNC_CLOSING;
- /*
- * Save the termios structure, since this port may have
- * separate termios for callout and dialin.
- */
- if (info->flags & ASYNC_NORMAL_ACTIVE)
- info->normal_termios = *tty->termios;
- if (info->flags & ASYNC_CALLOUT_ACTIVE)
- info->callout_termios = *tty->termios;
- if (info->flags & ASYNC_INITIALIZED)
- tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
- shutdown(info);
- if (tty->driver.flush_buffer)
- tty->driver.flush_buffer(tty);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- info->event = 0;
- info->tty = 0;
- if (tty->ldisc.num != ldiscs[N_TTY].num) {
- if (tty->ldisc.close)
- (tty->ldisc.close)(tty);
- tty->ldisc = ldiscs[N_TTY];
- tty->termios->c_line = N_TTY;
- if (tty->ldisc.open)
- (tty->ldisc.open)(tty);
- }
- if (info->blocked_open) {
- if (info->close_delay) {
- current->state = TASK_INTERRUPTIBLE;
- current->timeout = jiffies + info->close_delay;
- schedule();
- }
- wake_up_interruptible(&info->open_wait);
- }
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
- ASYNC_CLOSING);
- wake_up_interruptible(&info->close_wait);
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_close done\n");
- #endif
-
- return;
- } /* cy_close */
-
- /*
- * cy_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
- void
- cy_hangup(struct tty_struct *tty)
- {
- struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
-
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_hangup ttyC%d\n", info->line); /* */
- #endif
-
- if (serial_paranoia_check(info, tty->device, "cy_hangup"))
- return;
-
- shutdown(info);
- #if 0
- info->event = 0;
- info->count = 0;
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: setting count to 0\n", __LINE__);
- #endif
- info->tty = 0;
- #endif
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
- wake_up_interruptible(&info->open_wait);
- } /* cy_hangup */
-
-
-
- /*
- * ------------------------------------------------------------
- * cy_open() and friends
- * ------------------------------------------------------------
- */
-
- static int
- block_til_ready(struct tty_struct *tty, struct file * filp,
- struct cyclades_port *info)
- {
- struct wait_queue wait = { current, NULL };
- struct cyclades_card *cinfo;
- unsigned long flags;
- int chip, channel;
- int retval;
- char *base_addr;
-
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (info->flags & ASYNC_CLOSING) {
- interruptible_sleep_on(&info->close_wait);
- if (info->flags & ASYNC_HUP_NOTIFY){
- return -EAGAIN;
- }else{
- return -ERESTARTSYS;
- }
- }
-
- /*
- * If this is a callout device, then just make sure the normal
- * device isn't being used.
- */
- if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
- if (info->flags & ASYNC_NORMAL_ACTIVE){
- return -EBUSY;
- }
- if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_SESSION_LOCKOUT) &&
- (info->session != current->session)){
- return -EBUSY;
- }
- if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_PGRP_LOCKOUT) &&
- (info->pgrp != current->pgrp)){
- return -EBUSY;
- }
- info->flags |= ASYNC_CALLOUT_ACTIVE;
- return 0;
- }
-
- /*
- * If non-blocking mode is set, then make the check up front
- * and then exit.
- */
- if (filp->f_flags & O_NONBLOCK) {
- if (info->flags & ASYNC_CALLOUT_ACTIVE){
- return -EBUSY;
- }
- info->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, info->count is dropped by one, so that
- * cy_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&info->open_wait, &wait);
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready before block: ttyC%d, count = %d\n",
- info->line, info->count);/**/
- #endif
- info->count--;
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count);
- #endif
- info->blocked_open++;
-
- cinfo = &cy_card[info->card];
- channel = info->line - cinfo->first_line;
- chip = channel>>2;
- channel &= 0x03;
- base_addr = (char *) (cinfo->base_addr + chip * CyRegSize);
-
- while (1) {
- save_flags(flags); cli();
- if (!(info->flags & ASYNC_CALLOUT_ACTIVE)){
- base_addr[CyCAR] = (u_char)channel;
- base_addr[CyMSVR1] = CyRTS;
- /* CP('S');CP('4'); */
- base_addr[CyMSVR2] = CyDTR;
- #ifdef SERIAL_DEBUG_DTR
- printk("cyc: %d: raising DTR\n", __LINE__);
- printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
- #endif
- }
- restore_flags(flags);
- current->state = TASK_INTERRUPTIBLE;
- if (tty_hung_up_p(filp)
- || !(info->flags & ASYNC_INITIALIZED) ){
- if (info->flags & ASYNC_HUP_NOTIFY) {
- retval = -EAGAIN;
- }else{
- retval = -ERESTARTSYS;
- }
- break;
- }
- save_flags(flags); cli();
- base_addr[CyCAR] = (u_char)channel;
- /* CP('L');CP1(1 && C_CLOCAL(tty)); CP1(1 && (base_addr[CyMSVR1] & CyDCD) ); */
- if (!(info->flags & ASYNC_CALLOUT_ACTIVE)
- && !(info->flags & ASYNC_CLOSING)
- && (C_CLOCAL(tty)
- || (base_addr[CyMSVR1] & CyDCD))) {
- restore_flags(flags);
- break;
- }
- restore_flags(flags);
- if (current->signal & ~current->blocked) {
- retval = -ERESTARTSYS;
- break;
- }
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready blocking: ttyC%d, count = %d\n",
- info->line, info->count);/**/
- #endif
- schedule();
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&info->open_wait, &wait);
- if (!tty_hung_up_p(filp)){
- info->count++;
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
- #endif
- }
- info->blocked_open--;
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready after blocking: ttyC%d, count = %d\n",
- info->line, info->count);/**/
- #endif
- if (retval)
- return retval;
- info->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- } /* block_til_ready */
-
- /*
- * This routine is called whenever a serial port is opened. It
- * performs the serial-specific initialization for the tty structure.
- */
- int
- cy_open(struct tty_struct *tty, struct file * filp)
- {
- struct cyclades_port *info;
- int retval, line;
-
- /* CP('O'); */
- line = MINOR(tty->device) - tty->driver.minor_start;
- if ((line < 0) || (NR_PORTS <= line)){
- return -ENODEV;
- }
- info = &cy_port[line];
- #ifdef SERIAL_DEBUG_OTHER
- printk("cy_open ttyC%d\n", info->line); /* */
- #endif
- if (serial_paranoia_check(info, tty->device, "cy_open")){
- return -ENODEV;
- }
- #ifdef SERIAL_DEBUG_OPEN
- printk("cy_open ttyC%d, count = %d\n", info->line, info->count);/**/
- #endif
- info->count++;
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
- #endif
- tty->driver_data = info;
- info->tty = tty;
-
- if (!tmp_buf) {
- tmp_buf = (unsigned char *) get_free_page(GFP_KERNEL);
- if (!tmp_buf){
- return -ENOMEM;
- }
- }
-
- if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
- if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
- *tty->termios = info->normal_termios;
- else
- *tty->termios = info->callout_termios;
- }
- /*
- * Start up serial port
- */
- retval = startup(info);
- if (retval){
- return retval;
- }
-
- retval = block_til_ready(tty, filp, info);
- if (retval) {
- #ifdef SERIAL_DEBUG_OPEN
- printk("cy_open returning after block_til_ready with %d\n",
- retval);
- #endif
- return retval;
- }
-
- info->session = current->session;
- info->pgrp = current->pgrp;
-
- #ifdef SERIAL_DEBUG_OPEN
- printk("cy_open done\n");/**/
- #endif
- return 0;
- } /* cy_open */
-
-
-
- /*
- * ---------------------------------------------------------------------
- * cy_init() and friends
- *
- * cy_init() is called at boot-time to initialize the serial driver.
- * ---------------------------------------------------------------------
- */
-
- /*
- * This routine prints out the appropriate serial driver version
- * number, and identifies which options were configured into this
- * driver.
- */
- static void
- show_version(void)
- {
- printk("Cyclom driver %s\n",rcsid);
- } /* show_version */
-
- /* initialize chips on card -- return number of valid
- chips (which is number of ports/4) */
- int
- cy_init_card(unsigned char *base_addr)
- {
- volatile unsigned short discard;
- unsigned int chip_number;
-
- discard = base_addr[Cy_HwReset]; /* Cy_HwReset is 0x1400 */
- discard = base_addr[Cy_ClrIntr]; /* Cy_ClrIntr is 0x1800 */
- udelay(500L);
-
- for(chip_number=0; chip_number<CyMaxChipsPerCard; chip_number++){
- udelay(1000L);
- if(base_addr[CyCCR] != 0x00){
- /*************
- printk(" chip #%d at %#6lx is never idle (CCR != 0)\n",
- chip_number, (unsigned long)base_addr);
- *************/
- return chip_number;
- }
-
- base_addr[CyGFRCR] = 0;
- udelay(10L);
-
- base_addr[CyCCR] = CyCHIP_RESET;
- udelay(1000L);
-
- if(base_addr[CyGFRCR] == 0x00){
- printk(" chip #%d at %#6lx is not responding (GFRCR stayed 0)\n",
- chip_number, (unsigned long)base_addr);
- return chip_number;
- }
- if((0xf0 & base_addr[CyGFRCR]) != 0x40){
- printk(" chip #%d at %#6lx is not valid (GFRCR == %#2x)\n",
- chip_number, (unsigned long)base_addr, base_addr[CyGFRCR]);
- return chip_number;
- }
- base_addr[CyGCR] = CyCH0_SERIAL;
- base_addr[CyPPR] = CyCLOCK_25_1MS * 5; /* run clock at 200 Hz */
-
- printk(" chip #%d at %#6lx is rev 0x%2x\n",
- chip_number, (unsigned long)base_addr, base_addr[CyGFRCR]);
-
- /* advance to next chip on card */
- base_addr += CyRegSize;
- }
-
- return chip_number;
- } /* cy_init_card */
-
- /* The serial driver boot-time initialization code!
- Hardware I/O ports are mapped to character special devices on a
- first found, first allocated manner. That is, this code searches
- for Cyclom cards in the system. As each is found, it is probed
- to discover how many chips (and thus how many ports) are present.
- These ports are mapped to the tty ports 32 and upward in monotonic
- fashion. If an 8-port card is replaced with a 16-port card, the
- port mapping on a following card will shift.
-
- This approach is different from what is used in the other serial
- device driver because the Cyclom is more properly a multiplexer,
- not just an aggregation of serial ports on one card.
-
- If there are more cards with more ports than have been statically
- allocated above, a warning is printed and the extra ports are ignored.
- */
- long
- cy_init(long kmem_start)
- {
- struct cyclades_port *info;
- struct cyclades_card *cinfo;
- int good_ports = 0;
- int port_num = 0;
- int index;
- #ifdef notyet
- struct sigaction sa;
- #endif
- int retval;
-
- scrn[1] = '\0';
- show_version();
-
- /* Initialize the tty_driver structure */
-
- memset(&cy_serial_driver, 0, sizeof(struct tty_driver));
- cy_serial_driver.magic = TTY_DRIVER_MAGIC;
- cy_serial_driver.name = "ttyC";
- cy_serial_driver.major = CYCLADES_MAJOR;
- cy_serial_driver.minor_start = 32;
- cy_serial_driver.num = NR_PORTS;
- cy_serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
- cy_serial_driver.subtype = SERIAL_TYPE_NORMAL;
- cy_serial_driver.init_termios = tty_std_termios;
- cy_serial_driver.init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- cy_serial_driver.flags = TTY_DRIVER_REAL_RAW;
- cy_serial_driver.refcount = &serial_refcount;
- cy_serial_driver.table = serial_table;
- cy_serial_driver.termios = serial_termios;
- cy_serial_driver.termios_locked = serial_termios_locked;
- cy_serial_driver.open = cy_open;
- cy_serial_driver.close = cy_close;
- cy_serial_driver.write = cy_write;
- cy_serial_driver.put_char = cy_put_char;
- cy_serial_driver.flush_chars = cy_flush_chars;
- cy_serial_driver.write_room = cy_write_room;
- cy_serial_driver.chars_in_buffer = cy_chars_in_buffer;
- cy_serial_driver.flush_buffer = cy_flush_buffer;
- cy_serial_driver.ioctl = cy_ioctl;
- cy_serial_driver.throttle = cy_throttle;
- cy_serial_driver.unthrottle = cy_unthrottle;
- cy_serial_driver.set_termios = cy_set_termios;
- cy_serial_driver.stop = cy_stop;
- cy_serial_driver.start = cy_start;
- cy_serial_driver.hangup = cy_hangup;
-
- /*
- * The callout device is just like normal device except for
- * major number and the subtype code.
- */
- cy_callout_driver = cy_serial_driver;
- cy_callout_driver.name = "cub";
- cy_callout_driver.major = CYCLADESAUX_MAJOR;
- cy_callout_driver.subtype = SERIAL_TYPE_CALLOUT;
-
- if (tty_register_driver(&cy_serial_driver))
- panic("Couldn't register Cyclom serial driver\n");
- if (tty_register_driver(&cy_callout_driver))
- panic("Couldn't register Cyclom callout driver\n");
-
- bh_base[CYCLADES_BH].routine = do_cyclades_bh;
- enable_bh(CYCLADES_BH);
-
- for (index = 0; index < 16; index++) {
- IRQ_cards[index] = 0;
- }
-
- port_num = 0;
- info = cy_port;
- for (index = 0, cinfo = cy_card; index < NR_CARDS; index++,cinfo++) {
- /*** initialize card ***/
- if(0 == (cinfo->num_chips =
- cy_init_card((unsigned char *)cinfo->base_addr))){
- /* this card is not present */
- continue;
- }
-
- #ifndef CY_DONT_PROBE
- /* find out the board's irq by probing */
- cinfo->irq = do_auto_irq(index);
- #endif
-
- /** bind IRQ to card **/
- if (cinfo->irq) {
- retval = request_irq(cinfo->irq, cy_interrupt,
- SA_INTERRUPT, "cyclades");
- if (retval){
- printk("request_irq returned %d\n",retval);
- /* return retval; */
- }
- IRQ_cards[cinfo->irq] = cinfo;
- }else{
- printk("couldn't get board's irq\n");
- continue;
- }
-
- printk(" share IRQ %d: ", cinfo->irq);
- good_ports = 4 * cinfo->num_chips;
-
- if(port_num < NR_PORTS){
- cinfo->first_line = port_num;
- while( good_ports-- && port_num < NR_PORTS){
- /*** initialize port ***/
- info->magic = CYCLADES_MAGIC;
- info->type = PORT_CIRRUS;
- info->card = index;
- info->line = port_num;
- info->flags = STD_COM_FLAGS;
- info->tty = 0;
- info->xmit_fifo_size = 12;
- info->cor1 = CyPARITY_NONE|Cy_1_STOP|Cy_8_BITS;
- info->cor2 = CyETC;
- info->cor3 = 0x08; /* _very_ small receive threshold */
- info->cor4 = 0;
- info->cor5 = 0;
- info->tbpr = baud_bpr[13]; /* Tx BPR */
- info->tco = baud_co[13]; /* Tx CO */
- info->rbpr = baud_bpr[13]; /* Rx BPR */
- info->rco = baud_co[13]; /* Rx CO */
- info->close_delay = 0;
- info->x_char = 0;
- info->event = 0;
- info->count = 0;
- #ifdef SERIAL_DEBUG_COUNT
- printk("cyc: %d: setting count to 0\n", __LINE__);
- #endif
- info->blocked_open = 0;
- info->tqueue.routine = do_softint;
- info->tqueue.data = info;
- info->callout_termios =cy_callout_driver.init_termios;
- info->normal_termios = cy_serial_driver.init_termios;
- info->open_wait = 0;
- info->close_wait = 0;
- /* info->session */
- /* info->pgrp */
- /* info->read_status_mask */
- /* info->timeout */
-
- printk("ttyC%1d ", info->line);
- port_num++;info++;
- if(!(port_num & 7)){
- printk("\n ");
- }
- }
- }else{
- cinfo->first_line = -1;
- }
- printk("\n");
- }
- while( port_num < NR_PORTS){
- info->line = -1;
- port_num++;info++;
- }
- return kmem_start;
-
- } /* cy_init */
-
- static void
- show_status(int line_num)
- {
- unsigned char *base_addr;
- int card,chip,channel;
- struct cyclades_port * info;
- unsigned long flags;
-
- info = &cy_port[line_num];
- card = info->card;
- channel = (info->line) - (cy_card[card].first_line);
- chip = channel>>2;
- channel &= 0x03;
- printk(" card %d, chip %d, channel %d\n", card, chip, channel);/**/
-
- printk(" cy_card\n");
- printk(" irq base_addr num_chips first_line = %d %lx %d %d\n",
- cy_card[card].irq, (long)cy_card[card].base_addr,
- cy_card[card].num_chips, cy_card[card].first_line);
-
- printk(" cy_port\n");
- printk(" card line flags = %d %d %x\n",
- info->card, info->line, info->flags);
- printk(" *tty read_status_mask timeout xmit_fifo_size = %lx %x %x %x\n",
- (long)info->tty, info->read_status_mask,
- info->timeout, info->xmit_fifo_size);
- printk(" cor1,cor2,cor3,cor4,cor5 = %x %x %x %x %x\n",
- info->cor1, info->cor2, info->cor3, info->cor4, info->cor5);
- printk(" tbpr,tco,rbpr,rco = %d %d %d %d\n",
- info->tbpr, info->tco, info->rbpr, info->rco);
- printk(" close_delay event count = %d %d %d\n",
- info->close_delay, info->event, info->count);
- printk(" x_char blocked_open = %x %x\n",
- info->x_char, info->blocked_open);
- printk(" session pgrp open_wait = %lx %lx %lx\n",
- info->session, info->pgrp, (long)info->open_wait);
-
-
- save_flags(flags); cli();
-
- base_addr = (unsigned char*)
- (cy_card[card].base_addr + chip * CyRegSize);
-
- /* Global Registers */
-
- printk(" CyGFRCR %x\n", base_addr[CyGFRCR]);
- printk(" CyCAR %x\n", base_addr[CyCAR]);
- printk(" CyGCR %x\n", base_addr[CyGCR]);
- printk(" CySVRR %x\n", base_addr[CySVRR]);
- printk(" CyRICR %x\n", base_addr[CyRICR]);
- printk(" CyTICR %x\n", base_addr[CyTICR]);
- printk(" CyMICR %x\n", base_addr[CyMICR]);
- printk(" CyRIR %x\n", base_addr[CyRIR]);
- printk(" CyTIR %x\n", base_addr[CyTIR]);
- printk(" CyMIR %x\n", base_addr[CyMIR]);
- printk(" CyPPR %x\n", base_addr[CyPPR]);
-
- base_addr[CyCAR] = (u_char)channel;
-
- /* Virtual Registers */
-
- printk(" CyRIVR %x\n", base_addr[CyRIVR]);
- printk(" CyTIVR %x\n", base_addr[CyTIVR]);
- printk(" CyMIVR %x\n", base_addr[CyMIVR]);
- printk(" CyMISR %x\n", base_addr[CyMISR]);
-
- /* Channel Registers */
-
- printk(" CyCCR %x\n", base_addr[CyCCR]);
- printk(" CySRER %x\n", base_addr[CySRER]);
- printk(" CyCOR1 %x\n", base_addr[CyCOR1]);
- printk(" CyCOR2 %x\n", base_addr[CyCOR2]);
- printk(" CyCOR3 %x\n", base_addr[CyCOR3]);
- printk(" CyCOR4 %x\n", base_addr[CyCOR4]);
- printk(" CyCOR5 %x\n", base_addr[CyCOR5]);
- printk(" CyCCSR %x\n", base_addr[CyCCSR]);
- printk(" CyRDCR %x\n", base_addr[CyRDCR]);
- printk(" CySCHR1 %x\n", base_addr[CySCHR1]);
- printk(" CySCHR2 %x\n", base_addr[CySCHR2]);
- printk(" CySCHR3 %x\n", base_addr[CySCHR3]);
- printk(" CySCHR4 %x\n", base_addr[CySCHR4]);
- printk(" CySCRL %x\n", base_addr[CySCRL]);
- printk(" CySCRH %x\n", base_addr[CySCRH]);
- printk(" CyLNC %x\n", base_addr[CyLNC]);
- printk(" CyMCOR1 %x\n", base_addr[CyMCOR1]);
- printk(" CyMCOR2 %x\n", base_addr[CyMCOR2]);
- printk(" CyRTPR %x\n", base_addr[CyRTPR]);
- printk(" CyMSVR1 %x\n", base_addr[CyMSVR1]);
- printk(" CyMSVR2 %x\n", base_addr[CyMSVR2]);
- printk(" CyRBPR %x\n", base_addr[CyRBPR]);
- printk(" CyRCOR %x\n", base_addr[CyRCOR]);
- printk(" CyTBPR %x\n", base_addr[CyTBPR]);
- printk(" CyTCOR %x\n", base_addr[CyTCOR]);
-
- restore_flags(flags);
- } /* show_status */
-
-
-