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path: root/drivers/serial/mpc52xx_uart.c
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2008-12-21powerpc/mpc5200: fix error paths in PSC UART probe functionWolfram Sang
- error cases for mapbase and irq were unbundled - mapped irq now gets disposed on error Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-12-21powerpc/mpc5200: add rts/cts handling in PSC UART driverWolfram Sang
Add RTS/CTS-support for the PSC of the MPC5200B. Tested with a Phytec MPC5200B-IO. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-12-21powerpc/mpc5200: Make PSC UART driver update serial errors countersRené Bürgel
This patch adds the capability to the mpc52xx-uart to report framing errors, parity errors, breaks and overruns to userspace. These values may be requested in userspace by using the ioctl TIOCGICOUNT. Signed-off-by: René Bürgel <r.buergel@unicontrol.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-12-05Fix incorrect use of loose in tty/serial driversNick Andrew
[Folded together as one diff from 3] It should be 'lose', not 'loose'. Signed-off-by: Nick Andrew <nick@nick-andrew.net> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-25serial/mpc52xx_uart: remove code associated with !CONFIG_PPC_MERGEKumar Gala
Now that arch/ppc is gone we don't need CONFIG_PPC_MERGE anymore remove the dead code associated with !CONFIG_PPC_MERGE. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-07-20Fix compile errors in SGI console drivers (linux-next tree)Takashi Iwai
The below is the patch to replace blindly all possible places, including Jack's fixes. Signed-off-by: Takashi Iwai <tiwai@suse.de> (Reviewed and checked rather than blindly added) Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-01Fix a potential issue in mpc52xx uart driverAndrew Liu
mpc52xx_uart_int and __uart_put_char both try to acquire the port->lock. Therefore the function sequence of: mpc52xx_uart_int--> ...-->flush_to_ldisc-->...-->__uart_put_char can potentially trigger a deadlock. To avoid this deadlock a fix similar to that found in the 8250.c serial driver is applied. The deadlock is avoided by releasing the lock before pushing a buffer and reacquiring it when completed. Signed-off-by: Andrew Liu <shengping.liu@windriver.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-04-29[POWERPC] mpc5200: Fix unterminated of_device_id tableGrant Likely
If CONFIG_PPC_MPC5121 is not set, then the of_device_id table for the mpc5200 serial driver will not get terminated with a NULL entry. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-04-15serial: fix platform driver hotplug/coldplugKay Sievers
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable serial platform drivers, to re-enable auto loading. NOTE that Kconfig for some of these drivers doesn't allow modular builds, and thus doesn't match the driver source's unload support. Presumably their unload code is buggy and/or weakly tested... [dbrownell@users.sourceforge.net: more drivers, registration fixes] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06[POWERPC] mpc52xx: fix compile error introduce when rebasing patchGrant Likely
When rebasing one of the mpc5200 psc UART patches I made a mistake and damaged the patch. This patch fixes the compile failure introduced in commit 25ae3a0739c69425a911925b43213895a9802b98 Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-02-06[POWERPC] mpc512x: Add MPC512x PSC support to MPC52xx psc driverJohn Rigby
Add 512x support using the psc_ops framework established with the previous patch. All 512x PSCs share the same interrupt so add IRQF_SHARED to irq flags. Signed-off-by: John Rigby <jrigby@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-02-06[POWERPC] mpc512x: Factor out 5200 dependencies from 52xx psc driverJohn Rigby
PSC devices are different between the mpc5200 and the mpc5121 this patch localizes the differences in preparation for adding mpc5121 support to the psc uart driver. Signed-off-by: John Rigby <jrigby@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-01-26[POWERPC] mpc5200: normalize compatible property bindingsGrant Likely
Update MPC5200 drivers to also look for compatible properties in the form "fsl,mpc5200-*" to better conform to open firmware generic names recommended practice as published here: http://www.openfirmware.org/1275/practice/gnames/gnamv14a.html This patch should *not* break compatibility with older device trees which do not use the 'fsl,' prefix. The drivers will still bind against the older names also. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-01-21[POWERPC] mpc5200: Cleanup checkpatch.pl problems in mpc52xx_uart.cJohn Rigby
In preparation of adding MPC5121 support cleanup some things that checkpatch.pl complains about also some minor fixes suggested by Stephen Rothwell. Signed-off-by: John Rigby <jrigby@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-01-21[POWERPC] Separate MPC52xx PSC FIFO registers from rest of PSCJohn Rigby
This is in preparation for the addition of MPC512x PSC support. The main difference in the 512x is in the fifo registers. Signed-off-by: John Rigby <jrigby@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2008-01-17[POWERPC] Add of_find_matching_node() helper functionGrant Likely
Similar to of_find_compatible_node(), of_find_matching_node() and for_each_matching_node() allow you to iterate over the device tree looking for specific nodes, except that they take of_device_id tables instead of strings. This also moves of_match_node() from driver/of/device.c to driver/of/base.c to colocate it with the of_find_matching_node which depends on it. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-14mpc52xx-uart: fix compile warning (format type mismatch)Grant Likely
Trivial compile warning fix Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-14[POWERPC] 52xx: Fix mpc52xx_uart_of_assign to use correct indexJohn Rigby
Use idx as index into mpc52xx_uart_nodes instead of i Signed-off-by: John Rigby <jrigby@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-05-07[POWERPC] Don't shutdown TX on mpc5200 serial port if it is a consoleGrant Likely
If the serial port gets shut down, then console output stalls. 9 out of 10 kernel hackers agree, this is a bad thing. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-05-02[POWERPC] Rename get_property to of_get_property: driversStephen Rothwell
These are all the remaining instances of get_property. Simple rename of get_property to of_get_property. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-02-17[POWERPC] Dispose irq mapping when done in mpc52xx_serial.cSylvain Munaut
Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-02-13[POWERPC] Fixup mp5200 drivers to match device tree changesGrant Likely
Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-01-09[POWERPC] Fix mpc52xx serial driver to work for arch/ppc againGrant Likely
The mpc52xx_uart_of_enumerate() function was added when adding 52xx support to arch/powerpc, but it must not be called for arch/ppc. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-12-08[PATCH] tty: switch to ktermiosAlan Cox
This is the grungy swap all the occurrences in the right places patch that goes with the updates. At this point we have the same functionality as before (except that sgttyb() returns speeds not zero) and are ready to begin turning new stuff on providing nobody reports lots of bugs If you are a tty driver author converting an out of tree driver the only impact should be termios->ktermios name changes for the speed/property setting functions from your upper layers. If you are implementing your own TCGETS function before then your driver was broken already and its about to get a whole lot more painful for you so please fix it 8) Also fill in c_ispeed/ospeed on init for most devices, although the current code will do this for you anyway but I'd like eventually to lose that extra paranoia [akpm@osdl.org: bluetooth fix] [mp3@de.ibm.com: sclp fix] [mp3@de.ibm.com: warning fix for tty3270] [hugh@veritas.com: fix tty_ioctl powerpc build] [jdike@addtoit.com: uml: fix ->set_termios declaration] Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Martin Peschke <mp3@de.ibm.com> Acked-by: Peter Oberparleiter <oberpar@de.ibm.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-05[POWERPC] Add of_platform_bus support to mpc52xx psc uart driverGrant Likely
Needed to support mpc52xx boards in arch/powerpc. This patch retains the platform_bus support when compiling for arch/ppc, but uses the of_platform bindings for arch/powerpc. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-12-05[POWERPC] typo fix and whitespace cleanup on mpc52xx-uart driverGrant Likely
Single typo fix and whitespace changes. In preparation for heavy changes to this driver when support for arch/powerpc is added. Since the driver will be changing significantly anyway, then may as well take the opportunity to clean it up first. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-10-06Various drivers' irq handlers: kill dead code, needless castsJeff Garzik
- Eliminate casts to/from void* - Eliminate checks for conditions that never occur. These typically fall into two classes: 1) Checking for 'dev_id == NULL', then it is never called with NULL as an argument. 2) Checking for invalid irq number, when the only caller (the system) guarantees the irq handler is called with the proper 'irq' number argument. Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-10-05IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-01[PATCH] ioremap balanced with iounmap for drivers/serial/mpc52xx_uart.cAmol Lad
ioremap must be balanced by an iounmap and failing to do so can result in a memory leak. Signed-off-by: Amol Lad <amol@verismonetworks.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-03Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-serialLinus Torvalds
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-serial: [SERIAL] Ensure 8250_pci quirks are not marked __devinit [SERIAL] Convert fifosize to an unsigned int
2006-07-02[PATCH] irq-flags: serial: Use the new IRQF_ constantsThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-02[SERIAL] Convert fifosize to an unsigned intRussell King
Some UARTs have more than 255 bytes of FIFO, which can't be represented by an unsigned char. Change the kernel's internal structure to be an unsigned int, but still export an unsigned char via the TIOCGSERIAL ioctl. If the TIOCSSERIAL ioctl provides a fifo size of 0, assume this means "don't change" otherwise we'll corrupt the larger fifo sizes. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-26[PATCH] devfs: Remove devfs support from the serial subsystemGreg Kroah-Hartman
Also fixes all serial drivers. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-03-24fix typos "wich" -> "which"Uwe Zeisberger
Signed-off-by: Uwe Zeisberger <zeisberg@informatik.uni-freiburg.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-03-20[SERIAL] kernel console should send CRLF not LFCRRussell King
Glen Turner reported that writing LFCR rather than the more traditional CRLF causes issues with some terminals. Since this aflicts many serial drivers, extract the common code to a library function (uart_console_write) and arrange for each driver to supply a "putchar" function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-10[PATCH] TTY layer buffering revampAlan Cox
The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06[PATCH] ppc32/serial: Change mpc52xx_uart.c to use the Low Density Serial ↵Sylvain Munaut
port major Before this patch we were just using the "classic" /dev/ttySx devices. However when another on the system is loaded that uses those (like drivers for serial PCMCIA), that creates a conflict for the minors. Therefore, we now use /dev/ttyPSC[0:5] (note the 0-based numbering !) with some minors we've been assigned in the "Low Density Serial port major" Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06[PATCH] ppc32/serial: Fix compiler errors with GCC 4.x in mpc52xx_uart.cSylvain Munaut
Signed-off-by: Wolfgang Denk <wd@denx.de> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-12[SERIAL] Fix mpc52xx_uart.cAndrey Volkov
Fix copy-paste bug in mpc52xx_uart.c (pdev<->dev) Signed-off-by: Andrey Volkov <avolkov@varma-el.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-09[DRIVER MODEL] Convert platform drivers to use struct platform_driverRussell King
This allows us to eliminate the casts in the drivers, and eventually remove the use of the device_driver function pointer methods for platform device drivers. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-29Create platform_device.h to contain all the platform device details.Russell King
Convert everyone who uses platform_bus_type to include linux/platform_device.h. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28[PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacksRussell King
In PM v1, all devices were called at SUSPEND_DISABLE level. Then all devices were called at SUSPEND_SAVE_STATE level, and finally SUSPEND_POWER_DOWN level. However, with PM v2, to maintain compatibility for platform devices, I arranged for the PM v2 suspend/resume callbacks to call the old PM v1 suspend/resume callbacks three times with each level in order so that existing drivers continued to work. Since this is obsolete infrastructure which is no longer necessary, we can remove it. Here's an (untested) patch to do exactly that. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-17[PATCH] Fix up some pm_message_t typesRichard Purdie
Fix up some pm_message_t types Signed-Off-By: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-31[SERIAL] Clean up and fix tty transmission start/stopingRussell King
The start_tx and stop_tx methods were passed a flag to indicate whether the start/stop was from the tty start/stop callbacks, and some drivers used this flag to decide whether to ask the UART to immediately stop transmission (where the UART supports such a feature.) There are other cases when we wish this to occur - when CTS is lowered, or if we change from soft to hard flow control and CTS is inactive. In these cases, this flag was false, and we would allow the transmitter to drain before stopping. There is really only one case where we want to let the transmitter drain before disabling, and that's when we run out of characters to send. Hence, re-jig the start_tx and stop_tx methods to eliminate this flag, and introduce new functions for the special "disable and allow transmitter to drain" case. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!