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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)
2006-10-04[PATCH] serial: Rename PORT_AT91 -> PORT_ATMELHaavard Skinnemoen
The at91_serial driver can be used with both AT32 and AT91 devices from Atmel and has therefore been renamed atmel_serial. The only thing left is to rename PORT_AT91 PORT_ATMEL. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Acked-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[SERIAL] Magic SysRq SAK does nothing on serial consolesSimon Tatham
Make sysrq-K work on serial console by passing in the tty. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-10-01[SERIAL] Fix oops when removing suspended serial portRussell King
A serial card might have been removed when the system is resumed. This results in a suspended port being shut down, which results in the ports shutdown method being called twice in a row. This causes BUGs. Avoid this by tracking the suspended state separately from the initialised state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-07-09[SERIAL] 8250: add tsi108 serial supportZang Roy-r61911
The following patch gets rid of CONFIG_TSI108_BRIDGE. I add UPIO_TSI to handle IIR and IER register in serial_in and serial_out. (1) the reason to rewrite serial_in: TSI108 rev Z1 version ERRATA. Reading the UART's Interrupt Identification Register (IIR) clears the Transmit Holding Register Empty (THRE) and Transmit buffer Empty (TEMP) interrupts even if they are not enabled in the Interrupt Enable Register (IER). This leads to loss of the interrupts. Interrupts are not cleared when reading UART registers as 32-bit word. (2) the reason to rewrite serial_out: Check for UART_IER_UUE bit in the autoconfig routine. This section of autoconfig is excluded for Tsi108/109 because bits 7 and 6 are reserved for internal use. They are R/W bits. In addition to incorrect identification, changing these bits (from 00) will make Tsi108/109 UART non-functional. Signed-off-by: Roy Zang <tie-fei.zang@freescale.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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[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>
2006-06-26[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>
2006-06-24[ARM] 3639/1: S3C2412: serial port supportBen Dooks
Patch from Ben Dooks Serial port support for the on-board UART blocks on the Samsung S3C2412 and S3C2413 UARTs. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-20Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (42 commits) [ARM] Fix tosa build error [ARM] 3610/1: Make reboot work on Versatile [ARM] 3609/1: S3C24XX: defconfig update for s3c2410_defconfig [ARM] 3591/1: Anubis: IDE device definitions [ARM] Include asm/hardware.h not asm/arch/hardware.h [ARM] 3594/1: Poodle: Add touchscreen support + other updates [ARM] 3564/1: sharpsl_pm: Abstract some machine specific parameters [ARM] 3561/1: Poodle: Correct the MMC/SD power control [ARM] 3593/1: Add reboot and shutdown handlers for Zaurus handhelds [ARM] 3599/1: AT91RM9200 remove global variables [ARM] 3607/1: AT91RM9200 misc fixes [ARM] 3605/1: AT91RM9200 Power Management [ARM] 3604/1: AT91RM9200 New boards [ARM] 3603/1: AT91RM9200 remove old files [ARM] 3592/1: AT91RM9200 Serial driver update [ARM] 3590/1: AT91RM9200 Platform devices support [ARM] 3589/1: AT91RM9200 DK/EK board update [ARM] 3588/1: AT91RM9200 CSB337/637 board update [ARM] 3587/1: AT91RM9200 hardware headers [ARM] 3586/1: AT91RM9200 header update ...
2006-06-19[ARM] 3592/1: AT91RM9200 Serial driver updateAndrew Victor
Patch from Andrew Victor This patch includes a number of updates to the AT91RM9200 serial driver. Changes include: 1. Conversion to a platform_driver. [Ivan Kokshaysky] 2. Replaced all references to AT91RM9200 with AT91. This driver can now also be used for the AT91SAM9216. 3. Allow TIOCM_LOOP to configure local loopback mode. 4. Cleaned up the 'read_status_mask' usage and interrupt handler code. [Chip Coldwell] 5. Suspend/resume support. [David Brownell] There are a few 'unused variable' warning when compiling this - I removed the new DMA support to keep this first patch simpler. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-05-24Merge branch 'master' of ↵David Woodhouse
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: include/asm-powerpc/unistd.h include/asm-sparc/unistd.h include/asm-sparc64/unistd.h Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-04-30[SERIAL] Clean up serial locking when obtaining a reference to a portRussell King
The locking for the uart_port is over complicated, and can be simplified if we introduce a flag to indicate that a port is "dead" and will be removed. This also helps the validator because it removes a case of non-nested unlock ordering. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org>
2006-04-26Don't include linux/config.h from anywhere else in include/David Woodhouse
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-03-22Merge master.kernel.org:/home/rmk/linux-2.6-serialLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-serial: [SERIAL] Merge avlab serial board entries in parport_serial [SERIAL] kernel console should send CRLF not LFCR
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>
2006-03-20[SPARC64]: Add SUN4V Hypervisor Console driver.David S. Miller
Since it can do things like BREAK and HUP, we implement this as a serial uart driver. This still needs interrupt probing code, as I haven't figured out how interrupts will work or be probed for on SUN4V yet. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-21[SERIAL] Make uart_port flags a bitwise typeRussell King
Same reasoning as commit 747c8a55946ed037bf7d62454c3c599c02af2262 but this time we're making uart_port flags a bitwise type - not all of these flags correspond with the old ASYNC_ flags, so there is the possibility for bugs if the wrong ASYNC_* constants are used. Always use UPF_* constants for uart_port->flags. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-21[SERIAL] Fix UPF_ flag usage with uart_info->flagsRussell King
The previous change found a bug in the serial SAK handling - because we were looking for UPF_SAK set in uart_info->flags, we would never raise a SAK condition. UPF_SAK is in uart_port->flags. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-21[SERIAL] Make uart_info flags a bitwise typeRussell King
The potential for confusing the flags is fairly high. Make uart_info's flags a bitwise type so sparse can check that the right flag definitions are used with the right structure. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-21[SERIAL] Make port->ops constantRussell King
No one should write to the port->ops structure, so make it constant. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-21[SERIAL] Remove UPF_AUTOPROBE and UPF_BOOT_ONLYMCARussell King
The functionality UPF_BOOT_ONLYMCA provided has been replaced by the 8250_mca module, which only registers MCA ports if MCA is present. UPF_AUTOPROBE has no functional effect - in fact, it's never tested. Only ibmasm set the flag. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-13[SERIAL] convert uart_state.sem to uart_state.mutexIngo Molnar
semaphore to mutex conversion. the conversion was generated via scripts, and the result was validated automatically via a script as well. build and boot tested. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-10[ARM] 3242/2: AT91RM9200 support for 2.6 (Serial)Andrew Victor
Patch from Andrew Victor This patch adds support to the 2.6 kernel series for the Atmel AT91RM9200 processor. This patch is the Serial driver. This version uses the newly re-written GPL'ed hardware headers. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-28[ARM] 3181/1: add PORT_ identifier for Hilscher netx uartSascha Hauer
Patch from Sascha Hauer This patch adds PORT_NETX for supporting the Hilscher netx embedded UARTs. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06[SERIAL] Support Au1x00 8250 UARTs using the generic 8250 driver.Pantelis Antoniou
The offsets of the registers are in a different place, and some parts cannot handle a full set of modem control signals. Signed-off-by: Pantelis Antoniou <pantelis@embeddedalley.ocm> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-31[SERIAL] Fix port numberingRussell King
The PORT_* macros must be uniquely numbered. This fixes the definitions. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-29Philips PNX8550 support: MIPS32-like core with 2 Trimedias on it.Pete Popov
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-09-08Fix up ARM serial driver compile failureLinus Torvalds
Proud member of Uglyhacks'R'US. Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Russell King <rmk+lkml@arm.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-06[SERIAL]: Avoid 'statement with no effect' warnings.David S. Miller
When SUPPORT_SYSRQ is false, gcc can emit warnings for the uart_handle_sysrq_char() that results. Using an empty inline returning zero kills the warning. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-31[ARM] 2866/1: add i.MX set_mctrl / get_mctrl functionsSascha Hauer
Patch from Sascha Hauer This patch adds support for setting and getting RTS / CTS via set_mtctrl / get_mctrl functions. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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>
2005-07-27[PATCH] serial_core whitespace fixRalf Baechle
Use tabs for formatting like anywhere else in this file. Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-16[PATCH] Serial: Move deprecation of register_serial forward to SeptemberRussell King
I think it's about time to make the build a little more vocal about the expiry of these functions. Due to recent discussions with problems in the console initialisation vs power manglement, I'd like to move the date forward to September. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-05-09[PATCH] Serial: Add uart_insert_char()Russell King
Add uart_insert_char(), which handles inserting characters into the flip buffer. This helper function handles the correct semantics for handling overrun in addition to inserting normal characters. Signed-off-by: Russell King <rmk@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!