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cyclades.c：源码内容

#undef BLOCKMOVE
#define Z_WAKE
#undef Z_EXT_CHARS_IN_BUFFER
static char rcsid[] =
"$Revision: 2.3.2.8 $$Date: 2000/07/06 18:14:16 $";
/*
* linux/drivers/char/cyclades.c
*
* This file contains the driver for the Cyclades async multiport
* serial boards.
*
* Initially written by Randolph Bentson <bentson@grieg.seaslug.org>.
* Modified and maintained by Marcio Saito <marcio@cyclades.com>.
* Currently maintained by Ivan Passos <ivan@cyclades.com>.
*
* For Technical support and installation problems, please send e-mail
* to support@cyclades.com.
*
* Much of the design and some of the code came from serial.c
* 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 supports shared IRQ's (only for PCI boards).
*
* $Log: cyclades.c,v $
* Revision 2.3.2.8 2000/07/06 18:14:16 ivan
* Fixed the PCI detection function to work properly on Alpha systems.
* Implemented support for TIOCSERGETLSR ioctl.
* Implemented full support for non-standard baud rates.
*
* Revision 2.3.2.7 2000/06/01 18:26:34 ivan
* Request PLX I/O region, although driver doesn't use it, to avoid
* problems with other drivers accessing it.
* Removed count for on-board buffer characters in cy_chars_in_buffer
* (Cyclades-Z only).
*
* Revision 2.3.2.6 2000/05/05 13:56:05 ivan
* Driver now reports physical instead of virtual memory addresses.
* Masks were added to some Cyclades-Z read accesses.
* Implemented workaround for PLX9050 bug that would cause a system lockup
* in certain systems, depending on the MMIO addresses allocated to the
* board.
* Changed the Tx interrupt programming in the CD1400 chips to boost up
* performance (Cyclom-Y only).
* Code is now compliant with the new module interface (module_[init|exit]).
* Make use of the PCI helper functions to access PCI resources.
* Did some code "housekeeping".
*
* Revision 2.3.2.5 2000/01/19 14:35:33 ivan
* Fixed bug in cy_set_termios on CRTSCTS flag turnoff.
*
* Revision 2.3.2.4 2000/01/17 09:19:40 ivan
* Fixed SMP locking in Cyclom-Y interrupt handler.
*
* Revision 2.3.2.3 1999/12/28 12:11:39 ivan
* Added a new cyclades_card field called nports to allow the driver to
* know the exact number of ports found by the Z firmware after its load;
* RX buffer contention prevention logic on interrupt op mode revisited
* (Cyclades-Z only);
* Revisited printk's for Z debug;
* Driver now makes sure that the constant SERIAL_XMIT_SIZE is defined;
*
* Revision 2.3.2.2 1999/10/01 11:27:43 ivan
* Fixed bug in cyz_poll that would make all ports but port 0
* unable to transmit/receive data (Cyclades-Z only);
* Implemented logic to prevent the RX buffer from being stuck with data
* due to a driver / firmware race condition in interrupt op mode
* (Cyclades-Z only);
* Fixed bug in block_til_ready logic that would lead to a system crash;
* Revisited cy_close spinlock usage;
*
* Revision 2.3.2.1 1999/09/28 11:01:22 ivan
* Revisited CONFIG_PCI conditional compilation for PCI board support;
* Implemented TIOCGICOUNT and TIOCMIWAIT ioctl support;
* _Major_ cleanup on the Cyclades-Z interrupt support code / logic;
* Removed CTS handling from the driver -- this is now completely handled
* by the firmware (Cyclades-Z only);
* Flush RX on-board buffers on a port open (Cyclades-Z only);
* Fixed handling of ASYNC_SPD_* TTY flags;
* Module unload now unmaps all memory area allocated by ioremap;
*
* Revision 2.3.1.1 1999/07/15 16:45:53 ivan
* Removed CY_PROC conditional compilation;
* Implemented SMP-awareness for the driver;
* Implemented a new ISA IRQ autoprobe that uses the irq_probe_[on|off]
* functions;
* The driver now accepts memory addresses (maddr=0xMMMMM) and IRQs
* (irq=NN) as parameters (only for ISA boards);
* Fixed bug in set_line_char that would prevent the Cyclades-Z
* ports from being configured at speeds above 115.2Kbps;
* Fixed bug in cy_set_termios that would prevent XON/XOFF flow control
* switching from working properly;
* The driver now only prints IRQ info for the Cyclades-Z if it's
* configured to work in interrupt mode;
*
* Revision 2.2.2.3 1999/06/28 11:13:29 ivan
* Added support for interrupt mode operation for the Z cards;
* Removed the driver inactivity control for the Z;
* Added a missing MOD_DEC_USE_COUNT in the cy_open function for when
* the Z firmware is not loaded yet;
* Replaced the "manual" Z Tx flush buffer by a call to a FW command of
* same functionality;
* Implemented workaround for IRQ setting loss on the PCI configuration
* registers after a PCI bridge EEPROM reload (affects PLX9060 only);
*
* Revision 2.2.2.2 1999/05/14 17:18:15 ivan
* /proc entry location changed to /proc/tty/driver/cyclades;
* Added support to shared IRQ's (only for PCI boards);
* Added support for Cobalt Qube2 systems;
* IRQ [de]allocation scheme revisited;
* BREAK implementation changed in order to make use of the 'break_ctl'
* TTY facility;
* Fixed typo in TTY structure field 'driver_name';
* Included a PCI bridge reset and EEPROM reload in the board
* initialization code (for both Y and Z series).
*
* Revision 2.2.2.1 1999/04/08 16:17:43 ivan
* Fixed a bug in cy_wait_until_sent that was preventing the port to be
* closed properly after a SIGINT;
* Module usage counter scheme revisited;
* Added support to the upcoming Y PCI boards (i.e., support to additional
* PCI Device ID's).
*
* Revision 2.2.1.10 1999/01/20 16:14:29 ivan
* Removed all unnecessary page-alignement operations in ioremap calls
* (ioremap is currently safe for these operations).
*
* Revision 2.2.1.9 1998/12/30 18:18:30 ivan
* Changed access to PLX PCI bridge registers from I/O to MMIO, in
* order to make PLX9050-based boards work with certain motherboards.
*
* Revision 2.2.1.8 1998/11/13 12:46:20 ivan
* cy_close function now resets (correctly) the tty->closing flag;
* JIFFIES_DIFF macro fixed.
*
* Revision 2.2.1.7 1998/09/03 12:07:28 ivan
* Fixed bug in cy_close function, which was not informing HW of
* which port should have the reception disabled before doing so;
* fixed Cyclom-8YoP hardware detection bug.
*
* Revision 2.2.1.6 1998/08/20 17:15:39 ivan
* Fixed bug in cy_close function, which causes malfunction
* of one of the first 4 ports when a higher port is closed
* (Cyclom-Y only).
*
* Revision 2.2.1.5 1998/08/10 18:10:28 ivan
* Fixed Cyclom-4Yo hardware detection bug.
*
* Revision 2.2.1.4 1998/08/04 11:02:50 ivan
* /proc/cyclades implementation with great collaboration of
* Marc Lewis <marc@blarg.net>;
* cyy_interrupt was changed to avoid occurence of kernel oopses
* during PPP operation.
*
* Revision 2.2.1.3 1998/06/01 12:09:10 ivan
* General code review in order to comply with 2.1 kernel standards;
* data loss prevention for slow devices revisited (cy_wait_until_sent
* was created);
* removed conditional compilation for new/old PCI structure support
* (now the driver only supports the new PCI structure).
*
* Revision 2.2.1.1 1998/03/19 16:43:12 ivan
* added conditional compilation for new/old PCI structure support;
* removed kernel series (2.0.x / 2.1.x) conditional compilation.
*
* Revision 2.1.1.3 1998/03/16 18:01:12 ivan
* cleaned up the data loss fix;
* fixed XON/XOFF handling once more (Cyclades-Z);
* general review of the driver routines;
* introduction of a mechanism to prevent data loss with slow
* printers, by forcing a delay before closing the port.
*
* Revision 2.1.1.2 1998/02/17 16:50:00 ivan
* fixed detection/handling of new CD1400 in Ye boards;
* fixed XON/XOFF handling (Cyclades-Z);
* fixed data loss caused by a premature port close;
* introduction of a flag that holds the CD1400 version ID per port
* (used by the CYGETCD1400VER new ioctl).
*
* Revision 2.1.1.1 1997/12/03 17:31:19 ivan
* Code review for the module cleanup routine;
* fixed RTS and DTR status report for new CD1400's in get_modem_info;
* includes anonymous changes regarding signal_pending.
*
* Revision 2.1 1997/11/01 17:42:41 ivan
* Changes in the driver to support Alpha systems (except 8Zo V_1);
* BREAK fix for the Cyclades-Z boards;
* driver inactivity control by FW implemented;
* introduction of flag that allows driver to take advantage of
* a special CD1400 feature related to HW flow control;
* added support for the CD1400 rev. J (Cyclom-Y boards);
* introduction of ioctls to:
* - control the rtsdtr_inv flag (Cyclom-Y);
* - control the rflow flag (Cyclom-Y);
* - adjust the polling interval (Cyclades-Z);
*
* Revision 1.36.4.33 1997/06/27 19:00:00 ivan
* Fixes related to kernel version conditional
* compilation.
*
* Revision 1.36.4.32 1997/06/14 19:30:00 ivan
* Compatibility issues between kernels 2.0.x and
* 2.1.x (mainly related to clear_bit function).
*
* Revision 1.36.4.31 1997/06/03 15:30:00 ivan
* Changes to define the memory window according to the
* board type.
*
* Revision 1.36.4.30 1997/05/16 15:30:00 daniel
* Changes to support new cycladesZ boards.
*
* Revision 1.36.4.29 1997/05/12 11:30:00 daniel
* Merge of Bentson's and Daniel's version 1.36.4.28.
* Corrects bug in cy_detect_pci: check if there are more
* ports than the number of static structs allocated.
* Warning message during initialization if this driver is
* used with the new generation of cycladesZ boards. Those
* will be supported only in next release of the driver.
* Corrects bug in cy_detect_pci and cy_detect_isa that
* returned wrong number of VALID boards, when a cyclomY
* was found with no serial modules connected.
* Changes to use current (2.1.x) kernel subroutine names
* and created macros for compilation with 2.0.x kernel,
* instead of the other way around.
*
* Revision 1.36.4.28 1997/05/?? ??:00:00 bentson
* Change queue_task_irq_off to queue_task_irq.
* The inline function queue_task_irq_off (tqueue.h)
* was removed from latest releases of 2.1.x kernel.
* Use of macro __init to mark the initialization
* routines, so memory can be reused.
* Also incorporate implementation of critical region
* in function cleanup_module() created by anonymous
* linuxer.
*
* Revision 1.36.4.28 1997/04/25 16:00:00 daniel
* Change to support new firmware that solves DCD problem:
* application could fail to receive SIGHUP signal when DCD
* varying too fast.
*
* Revision 1.36.4.27 1997/03/26 10:30:00 daniel
* Changed for support linux versions 2.1.X.
* Backward compatible with linux versions 2.0.X.
* Corrected illegal use of filler field in
* CH_CTRL struct.
* Deleted some debug messages.
*
* Revision 1.36.4.26 1997/02/27 12:00:00 daniel
* Included check for NULL tty pointer in cyz_poll.
*
* Revision 1.36.4.25 1997/02/26 16:28:30 bentson
* Bill Foster at Blarg! Online services noticed that
* some of the switch elements of -Z modem control
* lacked a closing "break;"
*
* Revision 1.36.4.24 1997/02/24 11:00:00 daniel
* Changed low water threshold for buffer xmit_buf
*
* Revision 1.36.4.23 1996/12/02 21:50:16 bentson
* Marcio provided fix to modem status fetch for -Z
*
* Revision 1.36.4.22 1996/10/28 22:41:17 bentson
* improve mapping of -Z control page (thanks to Steve
* Price <stevep@fa.tdktca.com> for help on this)
*
* Revision 1.36.4.21 1996/09/10 17:00:10 bentson
* shift from CPU-bound to memcopy in cyz_polling operation
*
* Revision 1.36.4.20 1996/09/09 18:30:32 Bentson
* Added support to set and report higher speeds.
*
* Revision 1.36.4.19c 1996/08/09 10:00:00 Marcio Saito
* Some fixes in the HW flow control for the BETA release.
* Don't try to register the IRQ.
*
* Revision 1.36.4.19 1996/08/08 16:23:18 Bentson
* make sure "cyc" appears in all kernel messages; all soft interrupts
* handled by same routine; recognize out-of-band reception; comment
* out some diagnostic messages; leave RTS/CTS flow control to hardware;
* fix race condition in -Z buffer management; only -Y needs to explictly
* flush chars; tidy up some startup messages;
*
* Revision 1.36.4.18 1996/07/25 18:57:31 bentson
* shift MOD_INC_USE_COUNT location to match
* serial.c; purge some diagnostic messages;
*
* Revision 1.36.4.17 1996/07/25 18:01:08 bentson
* enable modem status messages and fetch & process them; note
* time of last activity type for each port; set_line_char now
* supports more than line 0 and treats 0 baud correctly;
* get_modem_info senses rs_status;
*
* Revision 1.36.4.16 1996/07/20 08:43:15 bentson
* barely works--now's time to turn on
* more features 'til it breaks
*
* Revision 1.36.4.15 1996/07/19 22:30:06 bentson
* check more -Z board status; shorten boot message
*
* Revision 1.36.4.14 1996/07/19 22:20:37 bentson
* fix reference to ch_ctrl in startup; verify return
* values from cyz_issue_cmd and cyz_update_channel;
* more stuff to get modem control correct;
*
* Revision 1.36.4.13 1996/07/11 19:53:33 bentson
* more -Z stuff folded in; re-order changes to put -Z stuff
* after -Y stuff (to make changes clearer)
*
* Revision 1.36.4.12 1996/07/11 15:40:55 bentson
* Add code to poll Cyclades-Z. Add code to get & set RS-232 control.
* Add code to send break. Clear firmware ID word at startup (so
* that other code won't talk to inactive board).
*
* Revision 1.36.4.11 1996/07/09 05:28:29 bentson
* add code for -Z in set_line_char
*
* Revision 1.36.4.10 1996/07/08 19:28:37 bentson
* fold more -Z stuff (or in some cases, error messages)
* into driver; add text to "don't know what to do" messages.
*
* Revision 1.36.4.9 1996/07/08 18:38:38 bentson
* moved compile-time flags near top of file; cosmetic changes
* to narrow text (to allow 2-up printing); changed many declarations
* to "static" to limit external symbols; shuffled code order to
* coalesce -Y and -Z specific code, also to put internal functions
* in order of tty_driver structure; added code to recognize -Z
* ports (and for moment, do nothing or report error); add cy_startup
* to parse boot command line for extra base addresses for ISA probes;
*
* Revision 1.36.4.8 1996/06/25 17:40:19 bentson
* reorder some code, fix types of some vars (int vs. long),
* add cy_setup to support user declared ISA addresses
*
* Revision 1.36.4.7 1996/06/21 23:06:18 bentson
* dump ioctl based firmware load (it's now a user level
* program); ensure uninitialzed ports cannot be used
*
* Revision 1.36.4.6 1996/06/20 23:17:19 bentson
* rename vars and restructure some code
*
* Revision 1.36.4.5 1996/06/14 15:09:44 bentson
* get right status back after boot load
*
* Revision 1.36.4.4 1996/06/13 19:51:44 bentson
* successfully loads firmware
*
* Revision 1.36.4.3 1996/06/13 06:08:33 bentson
* add more of the code for the boot/load ioctls
*
* Revision 1.36.4.2 1996/06/11 21:00:51 bentson
* start to add Z functionality--starting with ioctl
* for loading firmware
*
* Revision 1.36.4.1 1996/06/10 18:03:02 bentson
* added code to recognize Z/PCI card at initialization; report
* presence, but card is not initialized (because firmware needs
* to be loaded)
*
* Revision 1.36.3.8 1996/06/07 16:29:00 bentson
* starting minor number at zero; added missing verify_area
* as noted by Heiko Eissfeldt <heiko@colossus.escape.de>
*
* Revision 1.36.3.7 1996/04/19 21:06:18 bentson
* remove unneeded boot message & fix CLOCAL hardware flow
* control (Miquel van Smoorenburg <miquels@Q.cistron.nl>);
* remove unused diagnostic statements; minor 0 is first;
*
* Revision 1.36.3.6 1996/03/13 13:21:17 marcio
* The kernel function vremap (available only in later 1.3.xx kernels)
* allows the access to memory addresses above the RAM. This revision
* of the driver supports PCI boards below 1Mb (device id 0x100) and
* above 1Mb (device id 0x101).
*
* Revision 1.36.3.5 1996/03/07 15:20:17 bentson
* Some global changes to interrupt handling spilled into
* this driver--mostly unused arguments in system function
* calls. Also added change by Marcio Saito which should
* reduce lost interrupts at startup by fast processors.
*
* Revision 1.36.3.4 1995/11/13 20:45:10 bentson
* Changes by Corey Minyard <minyard@wf-rch.cirr.com> distributed
* in 1.3.41 kernel to remove a possible race condition, extend
* some error messages, and let the driver run as a loadable module
* Change by Alan Wendt <alan@ez0.ezlink.com> to remove a
* possible race condition.
* Change by Marcio Saito <marcio@cyclades.com> to fix PCI addressing.
*
* Revision 1.36.3.3 1995/11/13 19:44:48 bentson
* Changes by Linus Torvalds in 1.3.33 kernel distribution
* required due to reordering of driver initialization.
* Drivers are now initialized *after* memory management.
*
* Revision 1.36.3.2 1995/09/08 22:07:14 bentson
* remove printk from ISR; fix typo
*
* Revision 1.36.3.1 1995/09/01 12:00:42 marcio
* Minor fixes in the PCI board support. PCI function calls in
* conditional compilation (CONFIG_PCI). Thanks to Jim Duncan
* <duncan@okay.com>. "bad serial count" message removed.
*
* Revision 1.36.3 1995/08/22 09:19:42 marcio
* Cyclom-Y/PCI support added. Changes in the cy_init routine and
* board initialization. Changes in the boot messages. The driver
* supports up to 4 boards and 64 ports by default.
*
* Revision 1.36.1.4 1995/03/29 06:14:14 bentson
* disambiguate between Cyclom-16Y and Cyclom-32Ye;
*
* Revision 1.36.1.3 1995/03/23 22:15:35 bentson
* add missing break in modem control block in ioctl switch statement
* (discovered by Michael Edward Chastain <mec@jobe.shell.portal.com>);
*
* Revision 1.36.1.2 1995/03/22 19:16:22 bentson
* make sure CTS flow control is set as soon as possible (thanks
* to note from David Lambert <lambert@chesapeake.rps.slb.com>);
*
* Revision 1.36.1.1 1995/03/13 15:44:43 bentson
* initialize defaults for receive threshold and stale data timeout;
* cosmetic changes;
*
* Revision 1.36 1995/03/10 23:33:53 bentson
* added support of chips 4-7 in 32 port Cyclom-Ye;
* fix cy_interrupt pointer dereference problem
* (Joe Portman <baron@aa.net>);
* give better error response if open is attempted on non-existent port
* (Zachariah Vaum <jchryslr@netcom.com>);
* correct command timeout (Kenneth Lerman <lerman@@seltd.newnet.com>);
* conditional compilation for -16Y on systems with fast, noisy bus;
* comment out diagnostic print function;
* cleaned up table of base addresses;
* set receiver time-out period register to correct value,
* set receive threshold to better default values,
* set chip timer to more accurate 200 Hz ticking,
* add code to monitor and modify receive parameters
* (Rik Faith <faith@cs.unc.edu> Nick Simicich
* <njs@scifi.emi.net>);
*
* 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
*
*/
/* If you need to install more boards than NR_CARDS, change the constant
in the definition below. No other change is necessary to support up to
eight boards. Beyond that you'll have to extend cy_isa_addresses. */
#define NR_CARDS 4
/*
If the total number of ports is larger than NR_PORTS, change this
constant in the definition below. No other change is necessary to
support more boards/ports. */
#define NR_PORTS 256
#define ZE_V1_NPORTS 64
#define ZO_V1 0
#define ZO_V2 1
#define ZE_V1 2
#define SERIAL_PARANOIA_CHECK
#undef CY_DEBUG_OPEN
#undef CY_DEBUG_THROTTLE
#undef CY_DEBUG_OTHER
#undef CY_DEBUG_IO
#undef CY_DEBUG_COUNT
#undef CY_DEBUG_DTR
#undef CY_DEBUG_WAIT_UNTIL_SENT
#undef CY_DEBUG_INTERRUPTS
#undef CY_16Y_HACK
#undef CY_ENABLE_MONITORING
#undef CY_PCI_DEBUG
#if 0
#define PAUSE __asm__("nop");
#else
#define PAUSE ;
#endif
/*
* Include section
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/cyclades.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>
#define CY_LOCK(info,flags)
do {
spin_lock_irqsave(&cy_card[info->card].card_lock, flags);
} while (0)
#define CY_UNLOCK(info,flags)
do {
spin_unlock_irqrestore(&cy_card[info->card].card_lock, flags);
} while (0)
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/version.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#define cy_put_user put_user
static unsigned long
cy_get_user(unsigned long *addr)
{
unsigned long result = 0;
int error = get_user (result, addr);
if (error)
printk ("cyclades: cy_get_user: error == %dn", error);
return result;
}
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#define IS_CYC_Z(card) ((card).num_chips == -1)
#define Z_FPGA_CHECK(card)
((cy_readl(&((struct RUNTIME_9060 *)
((card).ctl_addr))->init_ctrl) & (1<<17)) != 0)
#define ISZLOADED(card) (((ZO_V1==cy_readl(&((struct RUNTIME_9060 *)
((card).ctl_addr))->mail_box_0)) ||
Z_FPGA_CHECK(card)) &&
(ZFIRM_ID==cy_readl(&((struct FIRM_ID *)
((card).base_addr+ID_ADDRESS))->signature)))
#ifndef SERIAL_XMIT_SIZE
#define SERIAL_XMIT_SIZE (MIN(PAGE_SIZE, 4096))
#endif
#define WAKEUP_CHARS 256
#define STD_COM_FLAGS (0)
#define JIFFIES_DIFF(n, j) ((j) - (n))
static DECLARE_TASK_QUEUE(tq_cyclades);
static struct tty_driver cy_serial_driver, cy_callout_driver;
static int serial_refcount;
#ifdef CONFIG_ISA
/* This is the address lookup table. The driver will probe for
Cyclom-Y/ISA boards at all addresses in here. If you want the
driver to probe addresses at a different address, add it to
this table. If the driver is probing some other board and
causing problems, remove the offending address from this table.
The cy_setup function extracts additional addresses from the
boot options line. The form is "cyclades=address,address..."
*/
static unsigned char *cy_isa_addresses[] = {
(unsigned char *) 0xD0000,
(unsigned char *) 0xD2000,
(unsigned char *) 0xD4000,
(unsigned char *) 0xD6000,
(unsigned char *) 0xD8000,
(unsigned char *) 0xDA000,
(unsigned char *) 0xDC000,
(unsigned char *) 0xDE000,
0,0,0,0,0,0,0,0
};
#define NR_ISA_ADDRS (sizeof(cy_isa_addresses)/sizeof(unsigned char*))
#ifdef MODULE
static long maddr[NR_CARDS] = { 0, };
static int irq[NR_CARDS] = { 0, };
MODULE_PARM(maddr, "1-" __MODULE_STRING(NR_CARDS) "l");
MODULE_PARM(irq, "1-" __MODULE_STRING(NR_CARDS) "i");
#endif
#endif /* CONFIG_ISA */
/* This is the per-card data structure containing address, irq, number of
channels, etc. This driver supports a maximum of NR_CARDS cards.
*/
static struct cyclades_card cy_card[NR_CARDS];
/* This is the per-channel data structure containing pointers, flags
and variables for the port. This driver supports a maximum of NR_PORTS.
*/
static struct cyclades_port cy_port[NR_PORTS];
static int cy_next_channel; /* next minor available */
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user 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. This buffer is
* allocated when the first cy_open occurs.
*/
static unsigned char *tmp_buf;
DECLARE_MUTEX(tmp_buf_sem);
/*
* 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
* 20
*/
static int baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800,115200,150000,
230400, 0};
static char baud_co_25[] = { /* 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[] = { /* 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_co_60[] = { /* 60 MHz clock option table (CD1400 J) */
/* value => 00 01 02 03 04 */
/* divide by 8 32 128 512 2048 */
0x00, 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03,
0x03, 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00};
static char baud_bpr_60[] = { /* 60 MHz baud rate period table (CD1400 J) */
0x00, 0x82, 0x21, 0xff, 0xdb, 0xc3, 0x92, 0x62, 0xc3, 0x62,
0x41, 0xc3, 0x62, 0xc3, 0x62, 0xc3, 0x82, 0x62, 0x41, 0x32,
0x21};
static char baud_cor3[] = { /* receive threshold */
0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07,
0x07};
/*
* The Cyclades driver implements HW flow control as any serial driver.
* The cyclades_port structure member rflow and the vector rflow_thr
* allows us to take advantage of a special feature in the CD1400 to avoid
* data loss even when the system interrupt latency is too high. These flags
* are to be used only with very special applications. Setting these flags
* requires the use of a special cable (DTR and RTS reversed). In the new
* CD1400-based boards (rev. 6.00 or later), there is no need for special
* cables.
*/
static char rflow_thr[] = { /* rflow threshold */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a};
/* The Cyclom-Ye has placed the sequential chips in non-sequential
* address order. This look-up table overcomes that problem.
*/
static int cy_chip_offset [] =
{ 0x0000,
0x0400,
0x0800,
0x0C00,
0x0200,
0x0600,
0x0A00,
0x0E00
};
/* PCI related definitions */
static unsigned short cy_pci_nboard;
static unsigned short cy_isa_nboard;
static unsigned short cy_nboard;
#ifdef CONFIG_PCI
static unsigned short cy_pci_dev_id[] = {
PCI_DEVICE_ID_CYCLOM_Y_Lo, /* PCI < 1Mb */
PCI_DEVICE_ID_CYCLOM_Y_Hi, /* PCI > 1Mb */
PCI_DEVICE_ID_CYCLOM_4Y_Lo, /* 4Y PCI < 1Mb */
PCI_DEVICE_ID_CYCLOM_4Y_Hi, /* 4Y PCI > 1Mb */
PCI_DEVICE_ID_CYCLOM_8Y_Lo, /* 8Y PCI < 1Mb */
PCI_DEVICE_ID_CYCLOM_8Y_Hi, /* 8Y PCI > 1Mb */
PCI_DEVICE_ID_CYCLOM_Z_Lo, /* Z PCI < 1Mb */
PCI_DEVICE_ID_CYCLOM_Z_Hi, /* Z PCI > 1Mb */
0 /* end of table */
};
#endif
static void cy_start(struct tty_struct *);
static void set_line_char(struct cyclades_port *);
static int cyz_issue_cmd(struct cyclades_card *, uclong, ucchar, uclong);
#ifdef CONFIG_ISA
static unsigned detect_isa_irq (volatile ucchar *);
#endif /* CONFIG_ISA */
static int cyclades_get_proc_info(char *, char **, off_t , int , int *, void *);
#ifndef CONFIG_CYZ_INTR
static void cyz_poll(unsigned long);
/* The Cyclades-Z polling cycle is defined by this variable */
static long cyz_polling_cycle = CZ_DEF_POLL;
static int cyz_timeron = 0;
static struct timer_list cyz_timerlist = {
function: cyz_poll
};
#else /* CONFIG_CYZ_INTR */
static void cyz_rx_restart(unsigned long);
static struct timer_list cyz_rx_full_timer[NR_PORTS];
#endif /* CONFIG_CYZ_INTR */
static inline int
serial_paranoia_check(struct cyclades_port *info,
kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"cyc Warning: bad magic number for serial struct (%s) in %sn";
static const char *badinfo =
"cyc Warning: null cyclades_port for (%s) in %sn";
static const char *badrange =
"cyc Warning: cyclades_port out of range for (%s) in %sn";
if (!info) {
printk(badinfo, kdevname(device), routine);
return 1;
}
if( (long)info < (long)(&cy_port[0])
|| (long)(&cy_port[NR_PORTS]) < (long)info ){
printk(badrange, kdevname(device), routine);
return 1;
}
if (info->magic != CYCLADES_MAGIC) {
printk(badmagic, kdevname(device), routine);
return 1;
}
#endif
return 0;
} /* serial_paranoia_check */
/*
* 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(&info->tqueue, &tq_cyclades); /* it belongs to */
mark_bh(CYCLADES_BH); /* then trigger event */
} /* cy_sched_event */
/*
* 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)
{
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 (test_and_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 (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
wake_up_interruptible(&info->open_wait);
}
#ifdef CONFIG_CYZ_INTR
if (test_and_clear_bit(Cy_EVENT_Z_RX_FULL, &info->event)) {
if (cyz_rx_full_timer[info->line].function == NULL) {
cyz_rx_full_timer[info->line].expires = jiffies + 1;
cyz_rx_full_timer[info->line].function = cyz_rx_restart;
cyz_rx_full_timer[info->line].data = (unsigned long)info;
add_timer(&cyz_rx_full_timer[info->line]);
}
}
#endif
if (test_and_clear_bit(Cy_EVENT_DELTA_WAKEUP, &info->event)) {
wake_up_interruptible(&info->delta_msr_wait);
}
if (test_and_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);
}
#ifdef Z_WAKE
if (test_and_clear_bit(Cy_EVENT_SHUTDOWN_WAKEUP, &info->event)) {
wake_up_interruptible(&info->shutdown_wait);
}
#endif
} /* do_softint */
/***********************************************************/
/********* Start of block of Cyclom-Y specific code ********/
/* This routine waits up to 1000 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.
This function is only called from inside spinlock-protected code.
*/
static int
cyy_issue_cmd(volatile ucchar *base_addr, u_char cmd, int index)
{
volatile int i;
/* Check to see that the previous command has completed */
for(i = 0 ; i < 100 ; i++){
if (cy_readb(base_addr+(CyCCR<<index)) == 0){
break;
}
udelay(10L);
}
/* if the CCR never cleared, the previous command
didn't finish within the "reasonable time" */
if (i == 100) return (-1);
/* Issue the new command */
cy_writeb((u_long)base_addr+(CyCCR<<index), cmd);
return(0);
} /* cyy_issue_cmd */
#ifdef CONFIG_ISA
/* ISA interrupt detection code */
static unsigned
detect_isa_irq (volatile ucchar *address)
{
int irq;
unsigned long irqs, flags;
int save_xir, save_car;
int index = 0; /* IRQ probing is only for ISA */
/* forget possible initially masked and pending IRQ */
irq = probe_irq_off(probe_irq_on());
/* Clear interrupts on the board first */
cy_writeb((u_long)address + (Cy_ClrIntr<<index), 0);
/* Cy_ClrIntr is 0x1800 */
irqs = probe_irq_on();
/* Wait ... */
udelay(5000L);
/* Enable the Tx interrupts on the CD1400 */
save_flags(flags); cli();
cy_writeb((u_long)address + (CyCAR<<index), 0);
cyy_issue_cmd(address, CyCHAN_CTL|CyENB_XMTR, index);
cy_writeb((u_long)address + (CyCAR<<index), 0);
cy_writeb((u_long)address + (CySRER<<index),
cy_readb(address + (CySRER<<index)) | CyTxRdy);
restore_flags(flags);
/* Wait ... */
udelay(5000L);
/* Check which interrupt is in use */
irq = probe_irq_off(irqs);
/* Clean up */
save_xir = (u_char) cy_readb(address + (CyTIR<<index));
save_car = cy_readb(address + (CyCAR<<index));
cy_writeb((u_long)address + (CyCAR<<index), (save_xir & 0x3));
cy_writeb((u_long)address + (CySRER<<index),
cy_readb(address + (CySRER<<index)) & ~CyTxRdy);
cy_writeb((u_long)address + (CyTIR<<index), (save_xir & 0x3f));
cy_writeb((u_long)address + (CyCAR<<index), (save_car));
cy_writeb((u_long)address + (Cy_ClrIntr<<index), 0);
/* Cy_ClrIntr is 0x1800 */
return (irq > 0)? irq : 0;
}
#endif /* CONFIG_ISA */
/* The real interrupt service routine is called
whenever the card wants its hand held--chars
received, out buffer empty, modem change, etc.
*/
static void
cyy_interrupt(int irq, void *dev_id, 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 int char_count;
int outch;
int i,j,index;
int too_many;
int had_work;
int mdm_change;
int mdm_status;
if((cinfo = (struct cyclades_card *)dev_id) == 0){
#ifdef CY_DEBUG_INTERRUPTS
printk("cyy_interrupt: spurious interrupt %dnr", irq);
#endif
return; /* spurious interrupt */
}
card_base_addr = (unsigned char *)cinfo->base_addr;
index = cinfo->bus_index;
/* 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 + (cy_chip_offset[chip]<<index));
too_many = 0;
while ( (status = cy_readb(base_addr+(CySVRR<<index))) != 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 */
#ifdef CY_DEBUG_INTERRUPTS
printk("cyy_interrupt: rcvd intr, chip %dnr", chip);
#endif
/* determine the channel & change to that context */
spin_lock(&cinfo->card_lock);
save_xir = (u_char) cy_readb(base_addr+(CyRIR<<index));
channel = (u_short ) (save_xir & CyIRChannel);
i = channel + chip * 4 + cinfo->first_line;
info = &cy_port[i];
info->last_active = jiffies;
save_car = cy_readb(base_addr+(CyCAR<<index));
cy_writeb((u_long)base_addr+(CyCAR<<index), save_xir);
/* if there is nowhere to put the data, discard it */
if(info->tty == 0){
j = (cy_readb(base_addr+(CyRIVR<<index)) & CyIVRMask);
if ( j == CyIVRRxEx ) { /* exception */
data = cy_readb(base_addr+(CyRDSR<<index));
} else { /* normal character reception */
char_count = cy_readb(base_addr+(CyRDCR<<index));
while(char_count--){
data = cy_readb(base_addr+(CyRDSR<<index));
}
}
}else{ /* there is an open port for this data */
tty = info->tty;
j = (cy_readb(base_addr+(CyRIVR<<index)) & CyIVRMask);
if ( j == CyIVRRxEx ) { /* exception */
data = cy_readb(base_addr+(CyRDSR<<index));
/* For statistics only */
if (data & CyBREAK)
info->icount.brk++;
else if(data & CyFRAME)
info->icount.frame++;
else if(data & CyPARITY)
info->icount.parity++;
else if(data & CyOVERRUN)
info->icount.overrun++;
if(data & info->ignore_status_mask){
info->icount.rx++;
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++ =
cy_readb(base_addr+(CyRDSR<<index));
info->icount.rx++;
if (info->flags & ASYNC_SAK){
do_SAK(tty);
}
}else if(data & CyFRAME){
*tty->flip.flag_buf_ptr++ =
TTY_FRAME;
*tty->flip.char_buf_ptr++ =
cy_readb(base_addr+(CyRDSR<<index));
info->icount.rx++;
info->idle_stats.frame_errs++;
}else if(data & CyPARITY){
*tty->flip.flag_buf_ptr++ =
TTY_PARITY;
*tty->flip.char_buf_ptr++ =
cy_readb(base_addr+(CyRDSR<<index));
info->icount.rx++;
info->idle_stats.parity_errs++;
}else if(data & CyOVERRUN){
*tty->flip.flag_buf_ptr++ =
TTY_OVERRUN;
*tty->flip.char_buf_ptr++ = 0;
info->icount.rx++;
/* If the flip buffer itself is
overflowing, we still lose
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++ =
cy_readb(base_addr+(CyRDSR<<index));
info->icount.rx++;
}
info->idle_stats.overruns++;
/* 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;
info->icount.rx++;
}
}else{
*tty->flip.flag_buf_ptr++ = 0;
*tty->flip.char_buf_ptr++ = 0;
info->icount.rx++;
}
}else{
/* there was a software buffer
overrun and nothing could be
done about it!!! */
info->icount.buf_overrun++;
info->idle_stats.overruns++;
}
} else { /* normal character reception */
/* load # chars available from the chip */
char_count = cy_readb(base_addr+(CyRDCR<<index));
#ifdef CY_ENABLE_MONITORING
++info->mon.int_count;
info->mon.char_count += char_count;
if (char_count > info->mon.char_max)
info->mon.char_max = char_count;
info->mon.char_last = char_count;
#endif
info->idle_stats.recv_bytes += char_count;
info->idle_stats.recv_idle = jiffies;
while(char_count--){
if (tty->flip.count >= TTY_FLIPBUF_SIZE){
break;
}
tty->flip.count++;
data = cy_readb(base_addr+(CyRDSR<<index));
*tty->flip.flag_buf_ptr++ = TTY_NORMAL;
*tty->flip.char_buf_ptr++ = data;
info->icount.rx++;
#ifdef CY_16Y_HACK
udelay(10L);
#endif
}
}
queue_task(&tty->flip.tqueue, &tq_timer);
}
/* end of service */
cy_writeb((u_long)base_addr+(CyRIR<<index), (save_xir & 0x3f));
cy_writeb((u_long)base_addr+(CyCAR<<index), (save_car));
spin_unlock(&cinfo->card_lock);
}
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. */
#ifdef CY_DEBUG_INTERRUPTS
printk("cyy_interrupt: xmit intr, chip %dnr", chip);
#endif
/* determine the channel & change to that context */
spin_lock(&cinfo->card_lock);
save_xir = (u_char) cy_readb(base_addr+(CyTIR<<index));
channel = (u_short ) (save_xir & CyIRChannel);
i = channel + chip * 4 + cinfo->first_line;
save_car = cy_readb(base_addr+(CyCAR<<index));
cy_writeb((u_long)base_addr+(CyCAR<<index), save_xir);
/* validate the port# (as configured and open) */
if( (i < 0) || (NR_PORTS <= i) ){
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) & ~CyTxRdy);
goto txend;
}
info = &cy_port[i];
info->last_active = jiffies;
if(info->tty == 0){
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) & ~CyTxRdy);
goto txdone;
}
/* load the on-chip space for outbound data */
char_count = info->xmit_fifo_size;
if(info->x_char) { /* send special char */
outch = info->x_char;
cy_writeb((u_long)base_addr+(CyTDR<<index), outch);
char_count--;
info->icount.tx++;
info->x_char = 0;
}
if (info->breakon || info->breakoff) {
if (info->breakon) {
cy_writeb((u_long)base_addr + (CyTDR<<index), 0);
cy_writeb((u_long)base_addr + (CyTDR<<index), 0x81);
info->breakon = 0;
char_count -= 2;
}
if (info->breakoff) {
cy_writeb((u_long)base_addr + (CyTDR<<index), 0);
cy_writeb((u_long)base_addr + (CyTDR<<index), 0x83);
info->breakoff = 0;
char_count -= 2;
}
}
while (char_count-- > 0){
if (!info->xmit_cnt){
if (cy_readb(base_addr+(CySRER<<index))&CyTxMpty) {
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) &
~CyTxMpty);
} else {
cy_writeb((u_long)base_addr+(CySRER<<index),
((cy_readb(base_addr+(CySRER<<index))
& ~CyTxRdy)
| CyTxMpty));
}
goto txdone;
}
if (info->xmit_buf == 0){
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) &
~CyTxRdy);
goto txdone;
}
if (info->tty->stopped || info->tty->hw_stopped){
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) &
~CyTxRdy);
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)
& (SERIAL_XMIT_SIZE - 1);
cy_writeb((u_long)base_addr+(CyTDR<<index), outch);
info->icount.tx++;
}else{
if(char_count > 1){
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1)
& (SERIAL_XMIT_SIZE - 1);
cy_writeb((u_long)base_addr+(CyTDR<<index),
outch);
cy_writeb((u_long)base_addr+(CyTDR<<index), 0);
info->icount.tx++;
char_count--;
}else{
}
}
}
txdone:
if (info->xmit_cnt < WAKEUP_CHARS) {
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
}
txend:
/* end of service */
cy_writeb((u_long)base_addr+(CyTIR<<index),
(save_xir & 0x3f));
cy_writeb((u_long)base_addr+(CyCAR<<index), (save_car));
spin_unlock(&cinfo->card_lock);
}
if (status & CySRModem) { /* modem interrupt */
/* determine the channel & change to that context */
spin_lock(&cinfo->card_lock);
save_xir = (u_char) cy_readb(base_addr+(CyMIR<<index));
channel = (u_short ) (save_xir & CyIRChannel);
info = &cy_port[channel + chip * 4
+ cinfo->first_line];
info->last_active = jiffies;
save_car = cy_readb(base_addr+(CyCAR<<index));
cy_writeb((u_long)base_addr+(CyCAR<<index), save_xir);
mdm_change = cy_readb(base_addr+(CyMISR<<index));
mdm_status = cy_readb(base_addr+(CyMSVR1<<index));
if(info->tty == 0){/* no place for data, ignore it*/
;
}else{
if (mdm_change & CyANY_DELTA) {
/* For statistics only */
if (mdm_change & CyDCD) info->icount.dcd++;
if (mdm_change & CyCTS) info->icount.cts++;
if (mdm_change & CyDSR) info->icount.dsr++;
if (mdm_change & CyRI) info->icount.rng++;
cy_sched_event(info, Cy_EVENT_DELTA_WAKEUP);
}
if((mdm_change & CyDCD)
&& (info->flags & ASYNC_CHECK_CD)){
if(mdm_status & CyDCD){
cy_sched_event(info,
Cy_EVENT_OPEN_WAKEUP);
}else if(!((info->flags
& ASYNC_CALLOUT_ACTIVE)
&&(info->flags
& ASYNC_CALLOUT_NOHUP))){
cy_sched_event(info,
Cy_EVENT_HANGUP);
}
}
if((mdm_change & CyCTS)
&& (info->flags & ASYNC_CTS_FLOW)){
if(info->tty->hw_stopped){
if(mdm_status & CyCTS){
/* cy_start isn't used
because... !!! */
info->tty->hw_stopped = 0;
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) |
CyTxRdy);
cy_sched_event(info,
Cy_EVENT_WRITE_WAKEUP);
}
}else{
if(!(mdm_status & CyCTS)){
/* cy_stop isn't used
because ... !!! */
info->tty->hw_stopped = 1;
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) &
~CyTxRdy);
}
}
}
if(mdm_change & CyDSR){
}
if(mdm_change & CyRI){
}
}
/* end of service */
cy_writeb((u_long)base_addr+(CyMIR<<index),
(save_xir & 0x3f));
cy_writeb((u_long)base_addr+(CyCAR<<index), save_car);
spin_unlock(&cinfo->card_lock);
}
} /* end while status != 0 */
} /* end loop for chips... */
} while(had_work);
/* clear interrupts */
spin_lock(&cinfo->card_lock);
cy_writeb((u_long)card_base_addr + (Cy_ClrIntr<<index), 0);
/* Cy_ClrIntr is 0x1800 */
spin_unlock(&cinfo->card_lock);
} /* cyy_interrupt */
/***********************************************************/
/********* End of block of Cyclom-Y specific code **********/
/******** Start of block of Cyclades-Z specific code *********/
/***********************************************************/
static int
cyz_fetch_msg( struct cyclades_card *cinfo,
uclong *channel, ucchar *cmd, uclong *param)
{
struct FIRM_ID *firm_id;
struct ZFW_CTRL *zfw_ctrl;
struct BOARD_CTRL *board_ctrl;
unsigned long loc_doorbell;
firm_id = (struct FIRM_ID *)(cinfo->base_addr + ID_ADDRESS);
if (!ISZLOADED(*cinfo)){
return (-1);
}
zfw_ctrl = (struct ZFW_CTRL *)
(cinfo->base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &zfw_ctrl->board_ctrl;
loc_doorbell = cy_readl(&((struct RUNTIME_9060 *)
(cinfo->ctl_addr))->loc_doorbell);
if (loc_doorbell){
*cmd = (char)(0xff & loc_doorbell);
*channel = cy_readl(&board_ctrl->fwcmd_channel);
*param = (uclong)cy_readl(&board_ctrl->fwcmd_param);
cy_writel(&((struct RUNTIME_9060 *)(cinfo->ctl_addr))->loc_doorbell,
0xffffffff);
return 1;
}
return 0;
} /* cyz_fetch_msg */
static int
cyz_issue_cmd( struct cyclades_card *cinfo,
uclong channel, ucchar cmd, uclong param)
{
struct FIRM_ID *firm_id;
struct ZFW_CTRL *zfw_ctrl;
struct BOARD_CTRL *board_ctrl;
volatile uclong *pci_doorbell;
int index;
firm_id = (struct FIRM_ID *)(cinfo->base_addr + ID_ADDRESS);
if (!ISZLOADED(*cinfo)){
return (-1);
}
zfw_ctrl = (struct ZFW_CTRL *)
(cinfo->base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &zfw_ctrl->board_ctrl;
index = 0;
pci_doorbell = (uclong *)(&((struct RUNTIME_9060 *)
(cinfo->ctl_addr))->pci_doorbell);
while( (cy_readl(pci_doorbell) & 0xff) != 0){
if (index++ == 1000){
return((int)(cy_readl(pci_doorbell) & 0xff));
}
udelay(50L);
}
cy_writel((u_long)&board_ctrl->hcmd_channel, channel);
cy_writel((u_long)&board_ctrl->hcmd_param , param);
cy_writel((u_long)pci_doorbell, (long)cmd);
return(0);
} /* cyz_issue_cmd */
static void
cyz_handle_rx(struct cyclades_port *info, volatile struct CH_CTRL *ch_ctrl,
volatile struct BUF_CTRL *buf_ctrl)
{
struct cyclades_card *cinfo = &cy_card[info->card];
struct tty_struct *tty = info->tty;
volatile int char_count;
#ifdef BLOCKMOVE
int small_count;
#else
char data;
#endif
volatile uclong rx_put, rx_get, new_rx_get, rx_bufsize, rx_bufaddr;
rx_get = new_rx_get = cy_readl(&buf_ctrl->rx_get);
rx_put = cy_readl(&buf_ctrl->rx_put);
rx_bufsize = cy_readl(&buf_ctrl->rx_bufsize);
rx_bufaddr = cy_readl(&buf_ctrl->rx_bufaddr);
if (rx_put >= rx_get)
char_count = rx_put - rx_get;
else
char_count = rx_put - rx_get + rx_bufsize;
if ( char_count ) {
info->last_active = jiffies;
info->jiffies[1] = jiffies;
#ifdef CY_ENABLE_MONITORING
info->mon.int_count++;
info->mon.char_count += char_count;
if (char_count > info->mon.char_max)
info->mon.char_max = char_count;
info->mon.char_last = char_count;
#endif
if(tty == 0){
/* flush received characters */
new_rx_get = (new_rx_get + char_count) & (rx_bufsize - 1);
info->rflush_count++;
}else{
#ifdef BLOCKMOVE
/* we'd like to use memcpy(t, f, n) and memset(s, c, count)
for performance, but because of buffer boundaries, there
may be several steps to the operation */
while(0 < (small_count =
min_t(unsigned int, (rx_bufsize - new_rx_get),
min_t(unsigned int, (TTY_FLIPBUF_SIZE - tty->flip.count), char_count))
)) {
memcpy_fromio(tty->flip.char_buf_ptr,
(char *)(cinfo->base_addr
+ rx_bufaddr + new_rx_get),
small_count);
tty->flip.char_buf_ptr += small_count;
memset(tty->flip.flag_buf_ptr, TTY_NORMAL, small_count);
tty->flip.flag_buf_ptr += small_count;
new_rx_get = (new_rx_get + small_count) & (rx_bufsize - 1);
char_count -= small_count;
info->icount.rx += small_count;
info->idle_stats.recv_bytes += small_count;
tty->flip.count += small_count;
}
#else
while(char_count--){
if (tty->flip.count >= TTY_FLIPBUF_SIZE){
break;
}
data = cy_readb(cinfo->base_addr + rx_bufaddr + new_rx_get);
new_rx_get = (new_rx_get + 1) & (rx_bufsize - 1);
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_NORMAL;
*tty->flip.char_buf_ptr++ = data;
info->idle_stats.recv_bytes++;
info->icount.rx++;
}
#endif
#ifdef CONFIG_CYZ_INTR
/* Recalculate the number of chars in the RX buffer and issue
a cmd in case it's higher than the RX high water mark */
rx_put = cy_readl(&buf_ctrl->rx_put);
if (rx_put >= rx_get)
char_count = rx_put - rx_get;
else
char_count = rx_put - rx_get + rx_bufsize;
if(char_count >= cy_readl(&buf_ctrl->rx_threshold)) {
cy_sched_event(info, Cy_EVENT_Z_RX_FULL);
}
#endif
info->idle_stats.recv_idle = jiffies;
queue_task(&tty->flip.tqueue, &tq_timer);
}
/* Update rx_get */
cy_writel(&buf_ctrl->rx_get, new_rx_get);
}
}
static void
cyz_handle_tx(struct cyclades_port *info, volatile struct CH_CTRL *ch_ctrl,
volatile struct BUF_CTRL *buf_ctrl)
{
struct cyclades_card *cinfo = &cy_card[info->card];
struct tty_struct *tty = info->tty;
char data;
volatile int char_count;
#ifdef BLOCKMOVE
int small_count;
#endif
volatile uclong tx_put, tx_get, tx_bufsize, tx_bufaddr;
if (info->xmit_cnt <= 0) /* Nothing to transmit */
return;
tx_get = cy_readl(&buf_ctrl->tx_get);
tx_put = cy_readl(&buf_ctrl->tx_put);
tx_bufsize = cy_readl(&buf_ctrl->tx_bufsize);
tx_bufaddr = cy_readl(&buf_ctrl->tx_bufaddr);
if (tx_put >= tx_get)
char_count = tx_get - tx_put - 1 + tx_bufsize;
else
char_count = tx_get - tx_put - 1;
if ( char_count ) {
if( tty == 0 ){
goto ztxdone;
}
if(info->x_char) { /* send special char */
data = info->x_char;
cy_writeb((cinfo->base_addr + tx_bufaddr + tx_put), data);
tx_put = (tx_put + 1) & (tx_bufsize - 1);
info->x_char = 0;
char_count--;
info->icount.tx++;
info->last_active = jiffies;
info->jiffies[2] = jiffies;
}
#ifdef BLOCKMOVE
while(0 < (small_count =
min_t(unsigned int, (tx_bufsize - tx_put),
min_t(unsigned int, (SERIAL_XMIT_SIZE - info->xmit_tail),
min_t(unsigned int, info->xmit_cnt, char_count))))) {
memcpy_toio((char *)(cinfo->base_addr + tx_bufaddr + tx_put),
&info->xmit_buf[info->xmit_tail],
small_count);
tx_put = (tx_put + small_count) & (tx_bufsize - 1);
char_count -= small_count;
info->icount.tx += small_count;
info->xmit_cnt -= small_count;
info->xmit_tail =
(info->xmit_tail + small_count) & (SERIAL_XMIT_SIZE - 1);
info->last_active = jiffies;
info->jiffies[2] = jiffies;
}
#else
while (info->xmit_cnt && char_count){
data = info->xmit_buf[info->xmit_tail];
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1) & (SERIAL_XMIT_SIZE - 1);
cy_writeb(cinfo->base_addr + tx_bufaddr + tx_put, data);
tx_put = (tx_put + 1) & (tx_bufsize - 1);
char_count--;
info->icount.tx++;
info->last_active = jiffies;
info->jiffies[2] = jiffies;
}
#endif
ztxdone:
if (info->xmit_cnt < WAKEUP_CHARS) {
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
}
/* Update tx_put */
cy_writel(&buf_ctrl->tx_put, tx_put);
}
}
static void
cyz_handle_cmd(struct cyclades_card *cinfo)
{
struct tty_struct *tty;
struct cyclades_port *info;
static volatile struct FIRM_ID *firm_id;
static volatile struct ZFW_CTRL *zfw_ctrl;
static volatile struct BOARD_CTRL *board_ctrl;
static volatile struct CH_CTRL *ch_ctrl;
static volatile struct BUF_CTRL *buf_ctrl;
uclong channel;
ucchar cmd;
uclong param;
uclong hw_ver, fw_ver;
int special_count;
int delta_count;
firm_id = (struct FIRM_ID *)(cinfo->base_addr + ID_ADDRESS);
zfw_ctrl = (struct ZFW_CTRL *)
(cinfo->base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &(zfw_ctrl->board_ctrl);
fw_ver = cy_readl(&board_ctrl->fw_version);
hw_ver = cy_readl(&((struct RUNTIME_9060 *)(cinfo->ctl_addr))->mail_box_0);
#ifdef CONFIG_CYZ_INTR
if (!cinfo->nports)
cinfo->nports = (int) cy_readl(&board_ctrl->n_channel);
#endif
while(cyz_fetch_msg(cinfo, &channel, &cmd, &param) == 1) {
special_count = 0;
delta_count = 0;
info = &cy_port[channel + cinfo->first_line];
if((tty = info->tty) == 0) {
continue;
}
ch_ctrl = &(zfw_ctrl->ch_ctrl[channel]);
buf_ctrl = &(zfw_ctrl->buf_ctrl[channel]);
switch(cmd) {
case C_CM_PR_ERROR:
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_PARITY;
*tty->flip.char_buf_ptr++ = 0;
info->icount.rx++;
special_count++;
break;
case C_CM_FR_ERROR:
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_FRAME;
*tty->flip.char_buf_ptr++ = 0;
info->icount.rx++;
special_count++;
break;
case C_CM_RXBRK:
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
*tty->flip.char_buf_ptr++ = 0;
info->icount.rx++;
special_count++;
break;
case C_CM_MDCD:
info->icount.dcd++;
delta_count++;
if (info->flags & ASYNC_CHECK_CD){
if ((fw_ver > 241 ?
((u_long)param) :
cy_readl(&ch_ctrl->rs_status)) & C_RS_DCD) {
cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
}else if(!((info->flags & ASYNC_CALLOUT_ACTIVE)
&&(info->flags & ASYNC_CALLOUT_NOHUP))){
cy_sched_event(info, Cy_EVENT_HANGUP);
}
}
break;
case C_CM_MCTS:
info->icount.cts++;
delta_count++;
break;
case C_CM_MRI:
info->icount.rng++;
delta_count++;
break;
case C_CM_MDSR:
info->icount.dsr++;
delta_count++;
break;
#ifdef Z_WAKE
case C_CM_IOCTLW:
cy_sched_event(info, Cy_EVENT_SHUTDOWN_WAKEUP);
break;
#endif
#ifdef CONFIG_CYZ_INTR
case C_CM_RXHIWM:
case C_CM_RXNNDT:
case C_CM_INTBACK2:
/* Reception Interrupt */
#ifdef CY_DEBUG_INTERRUPTS
printk("cyz_interrupt: rcvd intr, card %d, port %ldnr",
info->card, channel);
#endif
cyz_handle_rx(info, ch_ctrl, buf_ctrl);
break;
case C_CM_TXBEMPTY:
case C_CM_TXLOWWM:
case C_CM_INTBACK:
/* Transmission Interrupt */
#ifdef CY_DEBUG_INTERRUPTS
printk("cyz_interrupt: xmit intr, card %d, port %ldnr",
info->card, channel);
#endif
cyz_handle_tx(info, ch_ctrl, buf_ctrl);
break;
#endif /* CONFIG_CYZ_INTR */
case C_CM_FATAL:
/* should do something with this !!! */
break;
default:
break;
}
if(delta_count)
cy_sched_event(info, Cy_EVENT_DELTA_WAKEUP);
if(special_count)
queue_task(&tty->flip.tqueue, &tq_timer);
}
}
#ifdef CONFIG_CYZ_INTR
static void
cyz_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct cyclades_card *cinfo;
if((cinfo = (struct cyclades_card *)dev_id) == 0){
#ifdef CY_DEBUG_INTERRUPTS
printk("cyz_interrupt: spurious interrupt %dnr", irq);
#endif
return; /* spurious interrupt */
}
if (!ISZLOADED(*cinfo)) {
#ifdef CY_DEBUG_INTERRUPTS
printk("cyz_interrupt: board not yet loaded (IRQ%d).nr", irq);
#endif
return;
}
/* Handle the interrupts */
cyz_handle_cmd(cinfo);
return;
} /* cyz_interrupt */
static void
cyz_rx_restart(unsigned long arg)
{
struct cyclades_port *info = (struct cyclades_port *)arg;
int retval;
int card = info->card;
uclong channel = (info->line) - (cy_card[card].first_line);
unsigned long flags;
CY_LOCK(info, flags);
retval = cyz_issue_cmd(&cy_card[card], channel, C_CM_INTBACK2, 0L);
if (retval != 0){
printk("cyc:cyz_rx_restart retval on ttyC%d was %xn",
info->line, retval);
}
cyz_rx_full_timer[info->line].function = NULL;
CY_UNLOCK(info, flags);
}
#else /* CONFIG_CYZ_INTR */
static void
cyz_poll(unsigned long arg)
{
struct cyclades_card *cinfo;
struct cyclades_port *info;
struct tty_struct *tty;
static volatile struct FIRM_ID *firm_id;
static volatile struct ZFW_CTRL *zfw_ctrl;
static volatile struct BOARD_CTRL *board_ctrl;
static volatile struct CH_CTRL *ch_ctrl;
static volatile struct BUF_CTRL *buf_ctrl;
int card, port;
cyz_timerlist.expires = jiffies + (HZ);
for (card = 0 ; card < NR_CARDS ; card++){
cinfo = &cy_card[card];
if (!IS_CYC_Z(*cinfo)) continue;
if (!ISZLOADED(*cinfo)) continue;
firm_id = (struct FIRM_ID *)(cinfo->base_addr + ID_ADDRESS);
zfw_ctrl = (struct ZFW_CTRL *)
(cinfo->base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &(zfw_ctrl->board_ctrl);
/* Skip first polling cycle to avoid racing conditions with the FW */
if (!cinfo->intr_enabled) {
cinfo->nports = (int) cy_readl(&board_ctrl->n_channel);
cinfo->intr_enabled = 1;
continue;
}
cyz_handle_cmd(cinfo);
for (port = 0 ; port < cinfo->nports ; port++) {
info = &cy_port[ port + cinfo->first_line ];
tty = info->tty;
ch_ctrl = &(zfw_ctrl->ch_ctrl[port]);
buf_ctrl = &(zfw_ctrl->buf_ctrl[port]);
cyz_handle_rx(info, ch_ctrl, buf_ctrl);
cyz_handle_tx(info, ch_ctrl, buf_ctrl);
}
/* poll every 'cyz_polling_cycle' period */
cyz_timerlist.expires = jiffies + cyz_polling_cycle;
}
add_timer(&cyz_timerlist);
return;
} /* cyz_poll */
#endif /* CONFIG_CYZ_INTR */
/********** End of block of Cyclades-Z specific code *********/
/***********************************************************/
/* 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;
int retval = 0;
unsigned char *base_addr;
int card,chip,channel,index;
unsigned long page;
card = info->card;
channel = (info->line) - (cy_card[card].first_line);
page = get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
CY_LOCK(info, flags);
if (info->flags & ASYNC_INITIALIZED){
free_page(page);
goto errout;
}
if (!info->type){
if (info->tty){
set_bit(TTY_IO_ERROR, &info->tty->flags);
}
free_page(page);
goto errout;
}
if (info->xmit_buf)
free_page(page);
else
info->xmit_buf = (unsigned char *) page;
CY_UNLOCK(info, flags);
set_line_char(info);
if (!IS_CYC_Z(cy_card[card])) {
chip = channel>>2;
channel &= 0x03;
index = cy_card[card].bus_index;
base_addr = (unsigned char*)
(cy_card[card].base_addr + (cy_chip_offset[chip]<<index));
#ifdef CY_DEBUG_OPEN
printk("cyc startup card %d, chip %d, channel %d, base_addr %lxn",
card, chip, channel, (long)base_addr);/**/
#endif
CY_LOCK(info, flags);
cy_writeb((ulong)base_addr+(CyCAR<<index), (u_char)channel);
cy_writeb((ulong)base_addr+(CyRTPR<<index), (info->default_timeout
? info->default_timeout : 0x02)); /* 10ms rx timeout */
cyy_issue_cmd(base_addr,CyCHAN_CTL|CyENB_RCVR|CyENB_XMTR,index);
cy_writeb((ulong)base_addr+(CyCAR<<index), (u_char)channel);
cy_writeb((ulong)base_addr+(CyMSVR1<<index), CyRTS);
cy_writeb((ulong)base_addr+(CyMSVR2<<index), CyDTR);
#ifdef CY_DEBUG_DTR
printk("cyc:startup raising DTRn");
printk(" status: 0x%x, 0x%xn",
cy_readb(base_addr+(CyMSVR1<<index)),
cy_readb(base_addr+(CyMSVR2<<index)));
#endif
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) | 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;
info->breakon = info->breakoff = 0;
memset((char *)&info->idle_stats, 0, sizeof(info->idle_stats));
info->idle_stats.in_use =
info->idle_stats.recv_idle =
info->idle_stats.xmit_idle = jiffies;
CY_UNLOCK(info, flags);
} else {
struct FIRM_ID *firm_id;
struct ZFW_CTRL *zfw_ctrl;
struct BOARD_CTRL *board_ctrl;
struct CH_CTRL *ch_ctrl;
int retval;
base_addr = (unsigned char*) (cy_card[card].base_addr);
firm_id = (struct FIRM_ID *) (base_addr + ID_ADDRESS);
if (!ISZLOADED(cy_card[card])){
return -ENODEV;
}
zfw_ctrl = (struct ZFW_CTRL *)
(cy_card[card].base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &zfw_ctrl->board_ctrl;
ch_ctrl = zfw_ctrl->ch_ctrl;
#ifdef CY_DEBUG_OPEN
printk("cyc startup Z card %d, channel %d, base_addr %lxn",
card, channel, (long)base_addr);/**/
#endif
CY_LOCK(info, flags);
cy_writel(&ch_ctrl[channel].op_mode, C_CH_ENABLE);
#ifdef Z_WAKE
#ifdef CONFIG_CYZ_INTR
cy_writel(&ch_ctrl[channel].intr_enable,
C_IN_TXBEMPTY|C_IN_TXLOWWM|C_IN_RXHIWM|C_IN_RXNNDT|
C_IN_IOCTLW|
C_IN_MDCD);
#else
cy_writel(&ch_ctrl[channel].intr_enable,
C_IN_IOCTLW|
C_IN_MDCD);
#endif /* CONFIG_CYZ_INTR */
#else
#ifdef CONFIG_CYZ_INTR
cy_writel(&ch_ctrl[channel].intr_enable,
C_IN_TXBEMPTY|C_IN_TXLOWWM|C_IN_RXHIWM|C_IN_RXNNDT|
C_IN_MDCD);
#else
cy_writel(&ch_ctrl[channel].intr_enable,
C_IN_MDCD);
#endif /* CONFIG_CYZ_INTR */
#endif /* Z_WAKE */
retval = cyz_issue_cmd(&cy_card[card], channel, C_CM_IOCTL, 0L);
if (retval != 0){
printk("cyc:startup(1) retval on ttyC%d was %xn",
info->line, retval);
}
/* Flush RX buffers before raising DTR and RTS */
retval = cyz_issue_cmd(&cy_card[card], channel, C_CM_FLUSH_RX, 0L);
if (retval != 0){
printk("cyc:startup(2) retval on ttyC%d was %xn",
info->line, retval);
}
/* set timeout !!! */
/* set RTS and DTR !!! */
cy_writel(&ch_ctrl[channel].rs_control,
cy_readl(&ch_ctrl[channel].rs_control) | C_RS_RTS | C_RS_DTR) ;
retval = cyz_issue_cmd(&cy_card[info->card],
channel, C_CM_IOCTLM, 0L);
if (retval != 0){
printk("cyc:startup(3) retval on ttyC%d was %xn",
info->line, retval);
}
#ifdef CY_DEBUG_DTR
printk("cyc:startup raising Z DTRn");
#endif
/* enable send, recv, modem !!! */
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;
info->breakon = info->breakoff = 0;
memset((char *)&info->idle_stats, 0, sizeof(info->idle_stats));
info->idle_stats.in_use =
info->idle_stats.recv_idle =
info->idle_stats.xmit_idle = jiffies;
CY_UNLOCK(info, flags);
}
#ifdef CY_DEBUG_OPEN
printk(" cyc startup donen");
#endif
return 0;
errout:
CY_UNLOCK(info, flags);
return retval;
} /* startup */
static void
start_xmit( struct cyclades_port *info )
{
unsigned long flags;
unsigned char *base_addr;
int card,chip,channel,index;
card = info->card;
channel = (info->line) - (cy_card[card].first_line);
if (!IS_CYC_Z(cy_card[card])) {
chip = channel>>2;
channel &= 0x03;
index = cy_card[card].bus_index;
base_addr = (unsigned char*)
(cy_card[card].base_addr
+ (cy_chip_offset[chip]<<index));
CY_LOCK(info, flags);
cy_writeb((u_long)base_addr+(CyCAR<<index), channel);
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) | CyTxRdy);
CY_UNLOCK(info, flags);
} else {
#ifdef CONFIG_CYZ_INTR
int retval;
CY_LOCK(info, flags);
retval = cyz_issue_cmd(&cy_card[card], channel, C_CM_INTBACK, 0L);
if (retval != 0){
printk("cyc:start_xmit retval on ttyC%d was %xn",
info->line, retval);
}
CY_UNLOCK(info, flags);
#else /* CONFIG_CYZ_INTR */
/* Don't have to do anything at this time */
#endif /* CONFIG_CYZ_INTR */
}
} /* 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,index;
if (!(info->flags & ASYNC_INITIALIZED)){
return;
}
card = info->card;
channel = info->line - cy_card[card].first_line;
if (!IS_CYC_Z(cy_card[card])) {
chip = channel>>2;
channel &= 0x03;
index = cy_card[card].bus_index;
base_addr = (unsigned char*)
(cy_card[card].base_addr
+ (cy_chip_offset[chip]<<index));
#ifdef CY_DEBUG_OPEN
printk("cyc shutdown Y card %d, chip %d, channel %d, base_addr %lxn",
card, chip, channel, (long)base_addr);
#endif
CY_LOCK(info, flags);
/* Clear delta_msr_wait queue to avoid mem leaks. */
wake_up_interruptible(&info->delta_msr_wait);
if (info->xmit_buf){
unsigned char * temp;
temp = info->xmit_buf;
info->xmit_buf = 0;
free_page((unsigned long) temp);
}
cy_writeb((u_long)base_addr+(CyCAR<<index), (u_char)channel);
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
cy_writeb((u_long)base_addr+(CyMSVR1<<index), ~CyRTS);
cy_writeb((u_long)base_addr+(CyMSVR2<<index), ~CyDTR);
#ifdef CY_DEBUG_DTR
printk("cyc shutdown dropping DTRn");
printk(" status: 0x%x, 0x%xn",
cy_readb(base_addr+(CyMSVR1<<index)),
cy_readb(base_addr+(CyMSVR2<<index)));
#endif
}
cyy_issue_cmd(base_addr,CyCHAN_CTL|CyDIS_RCVR,index);
/* 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;
CY_UNLOCK(info, flags);
} else {
struct FIRM_ID *firm_id;
struct ZFW_CTRL *zfw_ctrl;
struct BOARD_CTRL *board_ctrl;
struct CH_CTRL *ch_ctrl;
int retval;
base_addr = (unsigned char*) (cy_card[card].base_addr);
#ifdef CY_DEBUG_OPEN
printk("cyc shutdown Z card %d, channel %d, base_addr %lxn",
card, channel, (long)base_addr);
#endif
firm_id = (struct FIRM_ID *) (base_addr + ID_ADDRESS);
if (!ISZLOADED(cy_card[card])) {
return;
}
zfw_ctrl = (struct ZFW_CTRL *)
(cy_card[card].base_addr +
(cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &(zfw_ctrl->board_ctrl);
ch_ctrl = zfw_ctrl->ch_ctrl;
CY_LOCK(info, flags);
if (info->xmit_buf){
unsigned char * temp;
temp = info->xmit_buf;
info->xmit_buf = 0;
free_page((unsigned long) temp);
}
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
cy_writel((u_long)&ch_ctrl[channel].rs_control,
(uclong)(cy_readl(&ch_ctrl[channel].rs_control) &
~(C_RS_RTS | C_RS_DTR)));
retval = cyz_issue_cmd(&cy_card[info->card],
channel, C_CM_IOCTLM, 0L);
if (retval != 0){
printk("cyc:shutdown retval on ttyC%d was %xn",
info->line, retval);
}
#ifdef CY_DEBUG_DTR
printk("cyc:shutdown dropping Z DTRn");
#endif
}
if (info->tty){
set_bit(TTY_IO_ERROR, &info->tty->flags);
}
info->flags &= ~ASYNC_INITIALIZED;
CY_UNLOCK(info, flags);
}
#ifdef CY_DEBUG_OPEN
printk(" cyc shutdown donen");
#endif
return;
} /* shutdown */
/*
* ------------------------------------------------------------
* cy_open() and friends
* ------------------------------------------------------------
*/
static int
block_til_ready(struct tty_struct *tty, struct file * filp,
struct cyclades_port *info)
{
DECLARE_WAITQUEUE(wait, current);
struct cyclades_card *cinfo;
unsigned long flags;
int chip, channel,index;
int retval;
char *base_addr;
cinfo = &cy_card[info->card];
channel = info->line - cinfo->first_line;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING) {
interruptible_sleep_on(&info->close_wait);
}
return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -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) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
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 CY_DEBUG_OPEN
printk("cyc block_til_ready before block: ttyC%d, count = %dn",
info->line, info->count);/**/
#endif
CY_LOCK(info, flags);
if (!tty_hung_up_p(filp))
info->count--;
CY_UNLOCK(info, flags);
#ifdef CY_DEBUG_COUNT
printk("cyc block_til_ready: (%d): decrementing count to %dn",
current->pid, info->count);
#endif
info->blocked_open++;
if (!IS_CYC_Z(*cinfo)) {
chip = channel>>2;
channel &= 0x03;
index = cinfo->bus_index;
base_addr = (char *)(cinfo->base_addr
+ (cy_chip_offset[chip]<<index));
while (1) {
CY_LOCK(info, flags);
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
(tty->termios->c_cflag & CBAUD)){
cy_writeb((u_long)base_addr+(CyCAR<<index), (u_char)channel);
cy_writeb((u_long)base_addr+(CyMSVR1<<index), CyRTS);
cy_writeb((u_long)base_addr+(CyMSVR2<<index), CyDTR);
#ifdef CY_DEBUG_DTR
printk("cyc:block_til_ready raising DTRn");
printk(" status: 0x%x, 0x%xn",
cy_readb(base_addr+(CyMSVR1<<index)),
cy_readb(base_addr+(CyMSVR2<<index)));
#endif
}
CY_UNLOCK(info, flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp)
|| !(info->flags & ASYNC_INITIALIZED) ){
retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
break;
}
CY_LOCK(info, flags);
cy_writeb((u_long)base_addr+(CyCAR<<index), (u_char)channel);
if (!(info->flags & ASYNC_CALLOUT_ACTIVE)
&& !(info->flags & ASYNC_CLOSING)
&& (C_CLOCAL(tty)
|| (cy_readb(base_addr+(CyMSVR1<<index)) & CyDCD))) {
CY_UNLOCK(info, flags);
break;
}
CY_UNLOCK(info, flags);
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef CY_DEBUG_OPEN
printk("cyc block_til_ready blocking: ttyC%d, count = %dn",
info->line, info->count);/**/
#endif
schedule();
}
} else {
struct FIRM_ID *firm_id;
struct ZFW_CTRL *zfw_ctrl;
struct BOARD_CTRL *board_ctrl;
struct CH_CTRL *ch_ctrl;
int retval;
base_addr = (char *)(cinfo->base_addr);
firm_id = (struct FIRM_ID *)
(base_addr + ID_ADDRESS);
if (!ISZLOADED(*cinfo)){
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
return -EINVAL;
}
zfw_ctrl = (struct ZFW_CTRL *)
(base_addr + (cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
board_ctrl = &zfw_ctrl->board_ctrl;
ch_ctrl = zfw_ctrl->ch_ctrl;
while (1) {
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
(tty->termios->c_cflag & CBAUD)){
cy_writel(&ch_ctrl[channel].rs_control,
cy_readl(&ch_ctrl[channel].rs_control) |
(C_RS_RTS | C_RS_DTR));
retval = cyz_issue_cmd(&cy_card[info->card],
channel, C_CM_IOCTLM, 0L);
if (retval != 0){
printk("cyc:block_til_ready retval on ttyC%d was %xn",
info->line, retval);
}
#ifdef CY_DEBUG_DTR
printk("cyc:block_til_ready raising Z DTRn");
#endif
}
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp)
|| !(info->flags & ASYNC_INITIALIZED) ){
retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
break;
}
if (!(info->flags & ASYNC_CALLOUT_ACTIVE)
&& !(info->flags & ASYNC_CLOSING)
&& (C_CLOCAL(tty)
|| (cy_readl(&ch_ctrl[channel].rs_status) & C_RS_DCD))) {
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef CY_DEBUG_OPEN
printk("cyc block_til_ready blocking: ttyC%d, count = %dn",
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 CY_DEBUG_COUNT
printk("cyc:block_til_ready (%d): incrementing count to %dn",
current->pid, info->count);
#endif
}
info->blocked_open--;
#ifdef CY_DEBUG_OPEN
printk("cyc:block_til_ready after blocking: ttyC%d, count = %dn",
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.
*/
static int
cy_open(struct tty_struct *tty, struct file * filp)
{
struct cyclades_port *info;
int retval, line;
unsigned long page;
MOD_INC_USE_COUNT;
line = MINOR(tty->device) - tty->driver.minor_start;
if ((line < 0) || (NR_PORTS <= line)){
MOD_DEC_USE_COUNT;
return -ENODEV;
}
info = &cy_port[line];
if (info->line < 0){
MOD_DEC_USE_COUNT;
return -ENODEV;
}
/* If the card's firmware hasn't been loaded,
treat it as absent from the system. This
will make the user pay attention.
*/
if (IS_CYC_Z(cy_card[info->card])) {
if (!ISZLOADED(cy_card[info->card])) {
if (((ZE_V1 ==cy_readl(&((struct RUNTIME_9060 *)
((cy_card[info->card]).ctl_addr))->mail_box_0)) &&
Z_FPGA_CHECK(cy_card[info->card])) &&
(ZFIRM_HLT==cy_readl(&((struct FIRM_ID *)
((cy_card[info->card]).base_addr+ID_ADDRESS))->signature)))
{
printk ("cyc:Cyclades-Z Error: you need an external power supply for this number of ports.nrFirmware halted.rn");
} else {
printk("cyc:Cyclades-Z firmware not yet loadedn");
}
MOD_DEC_USE_COUNT;
return -ENODEV;
}
#ifdef CONFIG_CYZ_INTR
else {
/* In case this Z board is operating in interrupt mode, its
interrupts should be enabled as soon as the first open happens
to one of its ports. */
if (!cy_card[info->card].intr_enabled) {
/* Enable interrupts on the PLX chip */
cy_writew(cy_card[info->card].ctl_addr+0x68,
cy_readw(cy_card[info->card].ctl_addr+0x68)|0x0900);
/* Enable interrupts on the FW */
retval = cyz_issue_cmd(&cy_card[info->card],
0, C_CM_IRQ_ENBL, 0L);
if (retval != 0){
printk("cyc:IRQ enable retval was %xn", retval);
}
cy_card[info->card].intr_enabled = 1;
}
}
#endif /* CONFIG_CYZ_INTR */
}
#ifdef CY_DEBUG_OTHER
printk("cyc:cy_open ttyC%dn", info->line); /* */
#endif
tty->driver_data = info;
info->tty = tty;
if (serial_paranoia_check(info, tty->device, "cy_open")){
return -ENODEV;
}
#ifdef CY_DEBUG_OPEN
printk("cyc:cy_open ttyC%d, count = %dn",
info->line, info->count);/**/
#endif
info->count++;
#ifdef CY_DEBUG_COUNT
printk("cyc:cy_open (%d): incrementing count to %dn",
current->pid, info->count);
#endif
if (!tmp_buf) {
page = get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
if (tmp_buf)
free_page(page);
else
tmp_buf = (unsigned char *) page;
}
/*
* If the port is the middle of closing, bail out now
*/
if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
}
/*
* Start up serial port
*/
retval = startup(info);
if (retval){
return retval;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
#ifdef CY_DEBUG_OPEN
printk("cyc:cy_open returning after block_til_ready with %dn",
retval);
#endif
return retval;
}
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;
}
info->session = current->session;
info->pgrp = current->pgrp;
#ifdef CY_DEBUG_OPEN
printk(" cyc:cy_open donen");/**/
#endif
return 0;
} /* cy_open */
/*
* cy_wait_until_sent() --- wait until the transmitter is empty
*/
static void
cy_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
unsigned char *base_addr;
int card,chip,channel,index;
unsigned long orig_jiffies, char_time;
if (serial_paranoia_check(info, tty->device, "cy_wait_until_sent"))
return;
if (info->xmit_fifo_size == 0)
return; /* Just in case.... */
orig_jiffies = jiffies;
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
* interval should also be less than the timeout.
*
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout < 0)
timeout = 0;
if (timeout)
char_time = MIN(char_time, timeout);
/*
* If the transmitter hasn't cleared in twice the approximate
* amount of time to send the entire FIFO, it probably won't
* ever clear. This assumes the UART isn't doing flow
* control, which is currently the case. Hence, if it ever
* takes longer than info->timeout, this is probably due to a
* UART bug of some kind. So, we clamp the timeout parameter at
* 2*info->timeout.
*/
if (!timeout || timeout > 2*info->timeout)
timeout = 2*info->timeout;
#ifdef CY_DEBUG_WAIT_UNTIL_SENT
printk("In cy_wait_until_sent(%d) check=%lu...", timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
card = info->card;
channel = (info->line) - (cy_card[card].first_line);
if (!IS_CYC_Z(cy_card[card])) {
chip = channel>>2;
channel &= 0x03;
index = cy_card[card].bus_index;
base_addr = (unsigned char *)
(cy_card[card].base_addr + (cy_chip_offset[chip]<<index));
while (cy_readb(base_addr+(CySRER<<index)) & CyTxRdy) {
#ifdef CY_DEBUG_WAIT_UNTIL_SENT
printk("Not clean (jiff=%lu)...", jiffies);
#endif
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(char_time);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
current->state = TASK_RUNNING;
} else {
// Nothing to do!
}
/* Run one more char cycle */
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(char_time * 5);
current->state = TASK_RUNNING;
#ifdef CY_DEBUG_WAIT_UNTIL_SENT
printk("Clean (jiff=%lu)...donen", jiffies);
#endif
}
/*
* This routine is called when a particular tty device is closed.
*/
static void
cy_close(struct tty_struct *tty, struct file *filp)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
#ifdef CY_DEBUG_OTHER
printk("cyc:cy_close ttyC%dn", info->line);
#endif
if (!info || serial_paranoia_check(info, tty->device, "cy_close")){
return;
}
CY_LOCK(info, flags);
/* If the TTY is being hung up, nothing to do */
if (tty_hung_up_p(filp)) {
MOD_DEC_USE_COUNT;
CY_UNLOCK(info, flags);
return;
}
#ifdef CY_DEBUG_OPEN
printk("cyc:cy_close ttyC%d, count = %dn", 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("cyc:cy_close: bad serial port count; tty->count is 1, "
"info->count is %dn", info->count);
info->count = 1;
}
#ifdef CY_DEBUG_COUNT
printk("cyc:cy_close at (%d): decrementing count to %dn",
current->pid, info->count - 1);
#endif
if (--info->count < 0) {
#ifdef CY_DEBUG_COUNT
printk("cyc:cyc_close setting count to 0n");
#endif
info->count = 0;
}
if (info->count) {
MOD_DEC_USE_COUNT;
CY_UNLOCK(info, flags);
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;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
CY_UNLOCK(info, flags);
if (info->closing_wait != CY_CLOSING_WAIT_NONE) {
tty_wait_until_sent(tty, info->closing_wait);
}
CY_LOCK(info, flags);
if (!IS_CYC_Z(cy_card[info->card])) {
int channel = info->line - cy_card[info->card].first_line;
int index = cy_card[info->card].bus_index;
unsigned char *base_addr = (unsigned char *)
(cy_card[info->card].base_addr +
(cy_chip_offset[channel>>2] <<index));
/* Stop accepting input */
channel &= 0x03;
cy_writeb((ulong)base_addr+(CyCAR<<index), (u_char)channel);
cy_writeb((u_long)base_addr+(CySRER<<index),
cy_readb(base_addr+(CySRER<<index)) & ~CyRxData);
if (info->flags & ASYNC_INITIALIZED) {
/* Waiting for on-board buffers to be empty before closing
the port */
CY_UNLOCK(info, flags);
cy_wait_until_sent(tty, info->timeout);
CY_LOCK(info, flags);
}
} else {
#ifdef Z_WAKE
/* Waiting for on-board buffers to be empty before closing the port */
unsigned char *base_addr = (unsigned char *)
cy_card[info->card].base_addr;
struct FIRM_ID *firm_id = (struct FIRM_ID *) (base_addr + ID_ADDRESS);
struct ZFW_CTRL *zfw_ctrl = (struct ZFW_CTRL *)
(base_addr + (cy_readl(&firm_id->zfwctrl_addr) & 0xfffff));
struct CH_CTRL *ch_ctrl = zfw_ctrl->ch_ctrl;
int channel = info->line - cy_card[info->card].first_line;
int retval;
if (cy_readl(&ch_ctrl[channel].flow_status) != C_FS_TXIDLE) {
retval = cyz_issue_cmd(&cy_card[info->card], channel,
C_CM_IOCTLW, 0L);
if (retval != 0){
printk("cyc:cy_close retval on ttyC%d was %xn",
info->line, retval);
}
CY_UNLOCK(info, flags);
interruptible_sleep_on(&info->shutdown_wait);
CY_LOCK(info, flags);
}
#endif
}
CY_UNLOCK(info, flags);
shutdown(info);
if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
CY_LOCK(info, flags);
tty->closing = 0;
info->event = 0;
info->tty = 0;