- 11 Jun, 2009 40 commits
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Sonic Zhang authored
The UART RX handling code isn't exactly speeding, so don't go disabling all interrupts when processing the buffer. Just disable the relevant DMA interrupt. This greatly improves latency of the system when utilizing the UART. Signed-off-by:
Sonic Zhang <sonic.zhang@analog.com> Signed-off-by:
Mike Frysinger <vapier@gentoo.org> Signed-off-by:
Alan Cox <alan@linux.intel.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Sonic Zhang authored
05000231 - UART STB Bit Incorrectly Affects Receiver Setting For processors affected by this, we cannot safely allow CSTOPB to be set as the UART will then be unable to properly clock in bytes. Signed-off-by:
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Sonic Zhang authored
Add some comments for how these anomalies are addressed: 05000215 - UART TX Interrupt Masked Erroneously We always clear ETBEI within last UART TX interrupt to end a string. It is always set when starting a new tx transfer. 05000099 - UART Line Status Register (UART_LSR) Bits Are Not Updated at the Same Time This anomaly affects driver only in POLL code where multi bits of UART_LSR are checked. It doesn't affect current bfin_5xx.c driver. Signed-off-by:
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Sonic Zhang authored
This bug is caused by irregular behavior of DMA register CURR_X_COUNT and CURR_Y_COUNT when an auto restart uart rx DMA run to last byte in DMA buffer, trigger the interrupt and stay at this possiton. The status of current x and y is 0:7 instead of 512:8 or 0:8. The driver doesn't take care of this case when calculating the position. URL: http://blackfin.uclinux.org/gf/tracker/5063Reported-by:
Tomasz Motylewski <t.motylewski@bfad.de> Signed-off-by:
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Graf Yang authored
Add a SSYNC() into bfin_serial_dma_tx_chars() to ensure DMA registers are written with new data otherwise we might miss a byte or two when the system is under load. PIO mode is OK though. Signed-off-by:
Graf Yang <graf.yang@analog.com> Signed-off-by:
Bryan Wu <cooloney@kernel.org> Signed-off-by:
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Robin Getz authored
Since we already setup the early console UART in arch/blackfin/kernel/early_printk.c, and common functions which are enabled from the .setup will override the proper settings later, don't fill in these structures. Otherwise we get mangled baudrate settings when using early_printk. Signed-off-by:
Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by:
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Sonic Zhang authored
Ignore receiving data if new position is in the same line of current buffer tail and is small. This should decrease overruns. Signed-off-by:
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Mike Frysinger authored
Hopefuly the new version is easier to read, but in the process it declares proper clobber lists and better constraints so that GCC can do a better job at allocating free registers. Signed-off-by:
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Michael Hennerich authored
SPORT transmit frame sync (TFS) isn't used as an electrical signal during normal SPORT UART emulation. However, it is useful in EIA RS-485 emulation as RS-485 Transceiver Driver Enable DE strobe. This patch configures: TFS to be active high in order to drive an DE strobe of an eventually connected RS-485 Transceiver. Late frame sync mode (LATFS) gating the entire TX shift cycle. Signed-off-by:
Michael Hennerich <michael.hennerich@analog.com> Signed-off-by:
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Mike Frysinger authored
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Florian Fainelli authored
This patch adds support for the TI AR7 internal UART. Signed-off-by:
Florian Fainelli <florian@openwrt.org> Signed-off-by:
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Breno Leitao authored
As it is, defining ICOM_TRACE produces some compile errors, as "parameter name omitted" and "redefinition of ‘trace’" This patch removes the wrong trace definition. Signed-off-by:
Breno Leitao <leitao@linux.vnet.ibm.com> Signed-off-by:
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Alan Cox authored
And tidy up a few bits coding style detectors missed Signed-off-by:
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Alan Cox authored
Michael's patch fixed some of the coding style so the style is now inconsistent. Sort the rest out Signed-off-by:
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Michael Buesch authored
This patch fixes array subscription bugs in the parport_pc driver. drivers/parport/parport_pc.c: In function ‘parport_irq_probe’: drivers/parport/parport_pc.c:1589: warning: array subscript is above array bounds drivers/parport/parport_pc.c: In function ‘parport_pc_probe_port’: drivers/parport/parport_pc.c:1579: warning: array subscript is above array bounds The patch also fixes a few other array bugs, which the compiler was unable to find. Coding style violations are also fixed. Signed-off-by:
Michael Buesch <mb@bu3sch.de> Signed-off-by:
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Alan Cox authored
Having cleaned up the allocators we might as well remove the inline helpers for some of it Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk Signed-off-by: -
Alan Cox authored
Long long ago a 4K kmalloc allocated two pages so the tty layer used the page allocator, except on some machines where the page size was huge. This was removed from the core tty layer with the tty buffer re-implementation but not from tty_audit or the n_tty ldisc. Signed-off-by:
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Breno Leitao authored
adapter->version can only be ADAPTER_V2 or ADAPTER_V1. So, that OR operand in the "if" clause is non-sense and can be removed. Signed-off-by:
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Alexander Y. Fomichev authored
If there are more then one 4/8-port board jsm_uart_port_init allocate a line numbers of the second and further boards from range of previous one. This patch fixed the problem. Signed-off-by:
Alexander Y. Fomichev <git.user@gmail.com> [printks fixed to add jsm: ] Signed-off-by:
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Olivier Bornet authored
Signed-off-by:
Olivier Bornet <Olivier.Bornet@puck.ch> Signed-off-by:
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Olivier Bornet authored
set_termios can now be used for setting the parity and the stopbits. This is needed to use with cards which use a different parity then the parity used at start (even). If the iuu_uart_baud function return an error, we will return the old_termios instead of the new one. Signed-off-by:
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Olivier Bornet authored
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Olivier Bornet authored
Bring in the relevant bits of the 0.9 vendor driver. Signed-off-by:
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Alan Cox authored
Signed-off-by:
Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Alan Cox authored
We have a tty_ldisc file now so put tty_ldisc_flush in the right place Signed-off-by:
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Alan Cox authored
There are several pretty much unfixable races in the old ldisc code, especially with respect to pty behaviour and also to hangup. It's easier to rewrite the code than simply try and patch it up. This patch - splits the ldisc from the tty (so we will be able to refcount it more cleanly later) - introduces a mutex lock for ldisc changing on an active device - fixes the complete mess that hangup caused - implements hopefully correct setldisc/close/hangup locking There are still some problems around pty pairs that have always been there but at least it is now possible to understand the code and fix further problems. This fixes the following known bugs - hang up can leak ldisc references - hang up may not call open/close on ldisc in a matched way - pty/tty pairs can deadlock during an ldisc change - reading the ldisc proc files can cause every ldisc to be loaded and probably a few other of the mysterious ldisc race reports. I'm sure it also adds the odd new one. Signed-off-by:
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Alan Cox authored
Before trying to tackle the ldisc bugs the code needs to be a good deal more readable, so do the simple extractions of routines first. Signed-off-by:
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Alan Cox authored
Costantino Leandro found a bug in tty_find_polling_driver and provided a patch that fixed the crash but not the underlying bug. This fixes the underlying bug where the list walk corrupts the values it is using on a match but then reuses them if the open fails. Signed-off-by:
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Alan Cox authored
We fixed the globals, so now fix the comment Signed-off-by:
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Alan Cox authored
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Alan Cox authored
The tty throttling code can race due to the lock drops. It takes very high loads but this has been observed and verified by Rob Duncan. The basic problem is that on an SMP box we can go CPU #1 CPU #2 need to throttle ? suppose we should buffer space cleared are we throttled yes ? - unthrottle call throttle method This changeet take the termios lock to protect against this. The termios lock isn't the initial obvious candidate but many implementations of throttle methods already need to poke around their own termios structures (and nobody really locks them against a racing change of flow control). This does mean that anyone who is setting tty->low_latency = 1 and then calling tty_flip_buffer_push from their unthrottle method is going to end up collapsing in a pile of locks. However we've removed all the known bogus users of low_latency = 1 and such use isn't safe anyway for other reasons so catching it would be an improvement. Signed-off-by:
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Arnd Bergmann authored
The legacy TCSETA{,W,F} ioctls failed to set the termio->c_line field on x86. This adds a missing get_user. The same ioctls also fail to report faulting user pointers, which we keep ignoring. Signed-off-by:Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Andre Przywara authored
This adds support for the following serial controller chip: Oxford Semiconductor OXCB950 for PCI Cardbus interface http://www.transdimension.com/products/serial/OXCB950.html on this card: ExSys EX-1370 1 port high-speed serial card for ExpressCard/34 slot Signed-off-by:
Andre Przywara <andre.przywara@amd.com> Signed-off-by:
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Jiri Slaby authored
Switch from ASYNC_* to ASYNCB_*, because test_bit expects bit number, not mask. Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Signed-off-by:
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Jiri Slaby authored
Switch from ASYNC_* to ASYNCB_*, because {test,set}_bit expect bit number, not mask. Signed-off-by: -
Jiri Slaby authored
Define ASYNCB_* flags which are bit numbers of the ASYNC_* flags. This is useful for {test,set,clear}_bit. Also convert each ASYNC_% to be (1 << ASYNCB_%) and define masks with the macros, not constants. Tested with: #include "PATH_TO_KERNEL/include/linux/serial.h" static struct { unsigned int new, old; } as[] = { { ASYNC_HUP_NOTIFY, 0x0001 }, { ASYNC_FOURPORT, 0x0002 }, ... { ASYNC_BOOT_ONLYMCA, 0x00400000 }, { ASYNC_INTERNAL_FLAGS, 0xFFC00000 } }; ... for (a = 0; a < ARRAY_SIZE(as); a++) if (as[a].old != as[a].new) printf("%.8x != %.8x\n", as[a].old, as[a].new); Signed-off-by: -
Alan Cox authored
Or at least most of it. There are further clean ups possible and there are are also thing checkpatch moans about that would be silly to "fix". Also note some FIXME points found as the cleanup was done. Signed-off-by:
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Alan Cox authored
Now we have a port structure begin using the fields and kref counts Signed-off-by:
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Jiri Slaby authored
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Jiri Slaby authored
Set up ports right after FW load so that we won't allocate maximal (64) ports when we use few. Also remove reading of nports in irq context, since we know it from initialisation now. This also fixes a tty ports unregistration on some fail paths and for Ze which registered 64 and unregistered real port count. Signed-off-by:
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