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2010-12-20ARM: smp: improve CPU bringup failure diagnosticsRussell King
We used to print a bland error message which gave no clue as to the failure when we failed to bring up a secondary CPU. Resolve this by separating the two failure cases. If boot_secondary() fails, we print a message indicating the returned error code from boot_secondary(): "CPU%u: failed to boot: %d\n", cpu, ret. However, if boot_secondary() succeeded, but the CPU did not appear to mark itself online within the timeout, indicate that it failed to come online: "CPU%u: failed to come online\n", cpu Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: VFP: re-initialize VFP coprocessor access enables on CPU hotplugRussell King
We can not guarantee that VFP will be enabled when CPU hotplug brings a CPU back online from a reset state. Add a hotplug CPU notifier to ensure that the VFP coprocessor access is enabled whenever a CPU comes back online. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: Fix subtle race in CPU pen_release hotplug codeRussell King
There is a subtle race in the CPU hotplug code, where a CPU which has been offlined can online itself before being requested, which results in things going astray on the next online/offline cycle. What happens in the normal online/offline/online cycle is: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads -1 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 However, as the write of -1 of pen_release is not fully flushed back to memory, and the checking of pen_release is done with caches disabled, this allows CPU3 the opportunity to read the old value of pen_release: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads 3 starts boot pen_release = -1 requests boot of CPU3 pen_release = 3 flush cache line Fix this by grouping the write of pen_release along with its cache line flushing code to ensure that any update to pen_release is always pushed out to physical memory. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: 6516/1: Allow SMP_ON_UP to work with Thumb-2 kernels.Dave Martin
* __fixup_smp_on_up has been modified with support for the THUMB2_KERNEL case. For THUMB2_KERNEL only, fixups are split into halfwords in case of misalignment, since we can't rely on unaligned accesses working before turning the MMU on. No attempt is made to optimise the aligned case, since the number of fixups is typically small, and it seems best to keep the code as simple as possible. * Add a rotate in the fixup_smp code in order to support CPU_BIG_ENDIAN, as suggested by Nicolas Pitre. * Add an assembly-time sanity-check to ALT_UP() to ensure that the content really is the right size (4 bytes). (No check is done for ALT_SMP(). Possibly, this could be fixed by splitting the two uses ot ALT_SMP() (ALT_SMP...SMP_UP versus ALT_SMP...SMP_UP_B) into two macros. In the first case, ALT_SMP needs to expand to >= 4 bytes, not == 4.) * smp_mpidr.h (which implements ALT_SMP()/ALT_UP() manually due to macro limitations) has not been modified: the affected instruction (mov) has no 16-bit encoding, so the correct instruction size is satisfied in this case. * A "mode" parameter has been added to smp_dmb: smp_dmb arm @ assumes 4-byte instructions (for ARM code, e.g. kuser) smp_dmb @ uses W() to ensure 4-byte instructions for ALT_SMP() This avoids assembly failures due to use of W() inside smp_dmb, when assembling pure-ARM code in the vectors page. There might be a better way to achieve this. * Kconfig: make SMP_ON_UP depend on (!THUMB2_KERNEL || !BIG_ENDIAN) i.e., THUMB2_KERNEL is now supported, but only if !BIG_ENDIAN (The fixup code for Thumb-2 currently assumes little-endian order.) Tested using a single generic realview kernel on: ARM RealView PB-A8 (CONFIG_THUMB2_KERNEL={n,y}) ARM RealView PBX-A9 (SMP) Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: remove smp_mpidr.hRussell King
With "ARM: CPU hotplug: remove bug checks in platform_cpu_die()", we now do not use hard_smp_processor_id(), we no longer need to read the hardware processor ID. Remove the include providing this function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: CPU hotplug: ensure correct ordering of unplugRussell King
Don't call idle_task_exit() with interrupts disabled, and ensure that we have a memory barrier after interrupts are disabled but before signalling that this CPU has shut down. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: CPU hotplug: remove bug checks in platform_cpu_die()Russell King
platform_cpu_die() is entered from the CPU's own idle thread, which can not be migrated to other CPUs. Moreover, the 'cpu' argument comes from the thread info, which will always be the 'current' CPU. So remove this useless bug check. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: CPU hotplug: move cpu_killed completion to core codeRussell King
We always need to wait for the dying CPU to reach a safe state before taking it down, irrespective of the requirements of the platform. Move the completion code into the ARM SMP hotplug code rather than having each platform re-implement this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: consolidate trace_hardirqs_off() into common SMP codeRussell King
All platforms call trace_hardirqs_off() in their secondary startup code, so move this into the core SMP code - it doesn't need to be in the per-platform code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: consolidate the common parts of smp_prepare_cpus()Russell King
There is a certain amount of smp_prepare_cpus() which doesn't belong in the platform support code - that is, code which is invariant to the SMP implementation. Move this code into arch/arm/kernel/smp.c, and add a platform_ prefix to the original function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: get rid of references to poke_milo and MiloRussell King
Milo is an old boot loader, which is no longer relevant for these platforms. References to it are misleading. Move the code out of poke_milo(), and remove references to milo in comments. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: get rid of get_core_count()Russell King
We don't need this small function as well as scu_get_core_count() Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: Clean up ncores sanity checksRussell King
scu_get_core_count() never returns zero cores, so we don't need to check and correct if ncores is zero. Tegra was missing the check against NR_CPUS, leading to a potential bitfield overflow if this becomes the case. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: move CPU number sanity checks to smp_init_cpus()Russell King
Ensure that the number of CPUs is sanity checked before setting the number of possible CPUs. This avoids any chance of overflowing the cpu_possible bitmap. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: ensure smp_send_stop() waits for CPUs to stopRussell King
Wait for CPUs to indicate that they've stopped, after sending the stop IPI, rather than blindly continuing on and hoping that they've stopped in time. Print a warning if we fail to stop the other CPUs. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: use more sane register allocation for __fixup_smp_on_upRussell King
Use r0,r3-r6 rather than r0,r3,r4,r6,r7, which makes it easier to understand which registers can be modified. Also document which registers hold values which must be preserved. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: collect IPI and local timer IRQs for /proc/statRussell King
The IPI and local timer interrupts weren't being properly accounted for in /proc/stat. Collect them from the irq_stat structure, and return their sum. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: provide individual IPI interrupt statisticsRussell King
This separates out the individual IPI interrupt counts from the total IPI count, which allows better visibility of what IPIs are being used for. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: pxa/colibri: setup pins for USB host port 3Bjorn Forsman
Tested on a Colibri Evaluation Board Rev.2.1 with a Colibri PXA310 module. Signed-off-by: Bjorn Forsman <bjorn.forsman@gmail.com> Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
2010-12-20ARM: mmp: refactored 5V regulator support using fixed-regulatorMark F. Brown
Signed-off-by: Mark F. Brown <mark.brown314@gmail.com> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: mmp: correct the naming of GPIOxx_GPIO definitionsEric Miao
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Add gpio-leds and vibrator support to PalmTCMarek Vasut
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Modularize Palm Tungsten|CMarek Vasut
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Colibri PXA320 PCMCIA driverMarek Vasut
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: add clock for static memory controllerEric Miao
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Rename Colibri evalboardMarek Vasut
Rename colibri-pxa270-evalboard to colibri-evalboard as this board is used with all Colibri modules. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Add M41T00 RTC support into Colibri evalboardMarek Vasut
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Push Colibri evalboard MFP into module filesMarek Vasut
This change -- pushing the MFP configuration back into Module files -- is necessary because some evalboards can be used with multiple modules, where MFP differs from module to module. Therefore MFP isn't board-specific, but module-specific and the module should preconfigure itself for the board. (And there is also the C preprocesor limitation and conflicting #define-s) Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: Toradex Colibri PXA270 CF supportMarek Vasut
This driver also contains structures to eventually support PXA320. This is planned to be added in a later patch. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: pxa: add iwmmx support for PJ4Haojian Zhuang
iwmmxt is used in XScale, XScale3, Mohawk and PJ4 core. But the instructions of accessing CP0 and CP1 is changed in PJ4. Append more files to support iwmmxt in PJ4 core. Signed-off-by: Zhou Zhu <zzhu3@marvell.com> Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20ARM: fix /proc/interrupts formattingRussell King
As per x86, align the initial column according to how many IRQs we have. Also, provide an english explaination for the 'LOC:' and 'IPI:' lines. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: move ipi_count into irq_stat structureRussell King
Move the ipi_count into irq_stat, which allows the ipi_data structure to be entirely removed. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: provide accessors for irq_stat dataRussell King
Provide __inc_irq_stat() and __get_irq_stat() to increment and read the irq stat counters. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: include local timer irq stats only when local timers configuredRussell King
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: remove send_ipi_message()Russell King
send_ipi_message() does nothing except call smp_cross_call(). As this is a static function, nothing external to this file calls it, so we can easily clean up this now unnecessary indirection. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ux500: add debugfs support for powerdebugVincent Guittot
Signed-off-by: Vincent Guittot <vincent.guittot@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-20Merge branch 'kmap_atomic_fixes' of git://git.linaro.org/people/nico/linuxRussell King
2010-12-20ARM: mxs: Add interrupt supportShawn Guo
Add Interrupt Collector (ICOLL) support for MXS-based. Signed-off-by: Shawn Guo <shawn.guo@freescale.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2010-12-20ARM: mxs: Add reset routinesShawn Guo
- The mxs wdog is implemented in RTC block. - There is a generic software reset routine for most modules on mxs. Signed-off-by: Shawn Guo <shawn.guo@freescale.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2010-12-19ux500: platsmp: Fix section mismatchJonas Aaberg
Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19mach-ux500: add STMPE1601 platform dataSundar Iyer
Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> [Minor fixups to GPIO enumerators] Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19mach-ux500: move keymaps to new fileSundar Iyer
Move keylayouts to a dedicated file and plug these keylayouts for input platform data. This will make addition of new and custom keylayouts localized. Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19mfd/tc3589x: add block identifier for multiple child devicesSundar Iyer
Add block identifier to be able to add multiple mfd clients to the mfd core Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19mfd/tc3589x: rename tc35892 structs/registers to tc359xSundar Iyer
Most of the register layout, client IRQ numbers on the TC35892 is shared also by other variants. Make this generic as tc3589x Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19mach-ux500: deprecate spi support for ab8500Sundar Iyer
Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
2010-12-19ARM: fix cache-feroceon-l2 after stack based kmap_atomic()Nicolas Pitre
Since commit 3e4d3af501 "mm: stack based kmap_atomic()", it is actively wrong to rely on fixed kmap type indices (namely KM_L2_CACHE) as kmap_atomic() totally ignores them and a concurrent instance of it may happily reuse any slot for any purpose. Because kmap_atomic() is now able to deal with reentrancy, we can get rid of the ad hoc mapping here. While the code is made much simpler, there is a needless cache flush introduced by the usage of __kunmap_atomic(). It is not clear if the performance difference to remove that is worth the cost in code maintenance (I don't think there are that many highmem users on that platform anyway) but that should be reconsidered when/if someone cares enough to do some measurements. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2010-12-19ARM: fix cache-xsc3l2 after stack based kmap_atomic()Nicolas Pitre
Since commit 3e4d3af501 "mm: stack based kmap_atomic()", it is actively wrong to rely on fixed kmap type indices (namely KM_L2_CACHE) as kmap_atomic() totally ignores them and a concurrent instance of it may happily reuse any slot for any purpose. Because kmap_atomic() is now able to deal with reentrancy, we can get rid of the ad hoc mapping here, and we even don't have to disable IRQs anymore (highmem case). While the code is made much simpler, there is a needless cache flush introduced by the usage of __kunmap_atomic(). It is not clear if the performance difference to remove that is worth the cost in code maintenance (I don't think there are that many highmem users on that platform if at all anyway). Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2010-12-19ARM: get rid of kmap_high_l1_vipt()Nicolas Pitre
Since commit 3e4d3af501 "mm: stack based kmap_atomic()", it is no longer necessary to carry an ad hoc version of kmap_atomic() added in commit 7e5a69e83b "ARM: 6007/1: fix highmem with VIPT cache and DMA" to cope with reentrancy. In fact, it is now actively wrong to rely on fixed kmap type indices (namely KM_L1_CACHE) as kmap_atomic() totally ignores them now and a concurrent instance of it may reuse any slot for any purpose. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2010-12-19ARM: AT91: update clock source registrationRussell King
In d7e81c2 (clocksource: Add clocksource_register_hz/khz interface) new interfaces were added which simplify (and optimize) the selection of the divisor shift/mult constants. Switch over to using this new interface. Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-19ARM: clockevents: fix IOP clock events initializationRussell King
Ensure that no interrupt is pending before registering the clock event device, and properly initialize the periodic tick in the ->set_mode callback. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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