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* clocksource: pass clocksource to read() callbackMagnus Damm2009-04-21
| | | | | | | | | | | | | | Pass clocksource pointer to the read() callback for clocksources. This allows us to share the callback between multiple instances. [hugh@veritas.com: fix powerpc build of clocksource pass clocksource mods] [akpm@linux-foundation.org: cleanup] Signed-off-by: Magnus Damm <damm@igel.co.jp> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Replace all DMA_nBIT_MASK macro with DMA_BIT_MASK(n)Yang Hongyang2009-04-13
| | | | | | | | | | | | | | | | This is the second go through of the old DMA_nBIT_MASK macro,and there're not so many of them left,so I put them into one patch.I hope this is the last round. After this the definition of the old DMA_nBIT_MASK macro could be removed. Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Tony Lindgren <tony@atomide.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Greg KH <greg@kroah.com> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'smsc911x-armplatforms' of git://github.com/steveglen/linux-2.6Russell King2009-04-02
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| * ARM: Add SMSC911X support to Overo platform (V2)Steve Sakoman2009-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | Gumstix will soon be shipping a variant of their Summit board that includes an SMSC LAN9221 ethernet interface. This patch provides support via the smsc911x driver when enabled in kernel config. The Overo defconfig is not updated since the LAN9221 is an option not present on all systems. Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Steve Glendinning <steve.glendinning@smsc.com>
| * arm: convert omap ldp platform to use smsc911xSteve Glendinning2009-04-02
| | | | | | | | | | | | | | | | from 2.6.29, smc911x isn't maintained anymore. A new driver, smsc911x, will replace it. so convert omap_ldp to use smsc911x driver. Signed-off-by: Stanley.Miao <stanley.miao@windriver.com> Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
* | [ARM] 5436/1: ARM: OMAP: Fix compile for rx51Tony Lindgren2009-04-01
|/ | | | | | | | | | | | | This fixes a compile error caused by a mismerge while rebasing the patch: linux-2.6/arch/arm/mach-omap2/board-rx51-peripherals.c:354: undefined reference to `twl4030_mmc_init' Looks like I need to also update my build scripts, just grepping for error: in the logs is not obviously enough.. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] OMAP: Fix compile for omap2_init_common_hw()Tony Lindgren2009-03-25
| | | | | Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Merge branch 'for-next' of ↵Russell King2009-03-25
|\ | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 into devel
| * ARM OMAP3: Initial support for Nokia RX-51, v3Lauri Leukkunen2009-03-23
| | | | | | | | | | | | | | | | | | | | | | Adds board files and related headers for Nokia RX-51 Internet Tablet. This patch has been updated with some clean-up patches posted earlier to linux-omap list. Signed-off-by: Lauri Leukkunen <lauri.leukkunen@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: Add support for 3430 SDP, v4Syed Mohammed Khasim2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for 3430 SDP. Various updates have been merged into this patch from the linux-omap list. Patch updated to initialize regulators by David Brownell <dbrownell@users.sourceforge.net>. Signed-off-by: Syed Mohammed Khasim <khasim@ti.com> David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: Add ADS7846 touchscreen support to Overo platform, v3Steve Sakoman2009-03-23
| | | | | | | | | | | | | | | | | | | | An upcoming Overo expansion board includes an ADS7846 touchscreen controller. This patch adds support via the ads7846 driver when enabled in the kernel config. Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: MUSB initialization for omap hw, v2Felipe Balbi2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Create a generic board-file for initializing usb on omap2430 and omap3 boards. Patch modified by Tony to build the module based on CONFIG_USB_MUSB_SOC. Also merged in a patch adding the nop xceiv from Ajay Kumar Gupta <ajay.gupta@ti.com>. Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com> Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: Add base address definitions and resources for OMAP 3 IS, v2Tony Lindgren2009-03-23
| | | | | | | | | | | | | | | | This replaces earlier patch from Sergio Aguirre titled "[REVIEW PATCH 03/14] OMAP34XX: CAM: Resources fixes". Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 allow arbitrary slot names, v3Adrian Hunter2009-03-23
| | | | | | | | | | | | Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 add cover switchAdrian Hunter2009-03-23
| | | | | | | | | | | | | | | | | | Allow a cover switch to be used to cause a rescan of the MMC slot. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 fix for vmmc = 0David Brownell2009-03-23
| | | | | | | | | | | | | | | | | | | | Resolve longstanding issue noted by Adrian Hunter: confusion between settting VSEL=0 (which is 1.8V on MMC1) and poweroff. Also, leave VSEL alone if we're just powering the regulator off. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 add MMC3 support, v2Grazvydas Ignotas2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Device connected to MMC3 is assumed to be self-powered, so set_power() function is empty. It can't be omited because host driver requires it. Array size for hsmmc[] is specified to allocate to allocate an instance for the third MMC controller. Also fix a leak which happens if invalid controller id is passed. Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 init passes device nodes back, v2David Brownell2009-03-23
| | | | | | | | | | | | | | | | When setting up HSMMC devices, pass the device nodes back so board code can linking them to their power supply regulators. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 voltage cleanupDavid Brownell2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Correct twl4030 MMC power switching: fix voltage ranges reported for each slot, and handle them fully. Lies corrected: - MMC-1 doesn't support the 2.6-2.7 Volt range - MMC-2 can't normally support anything except 1.8V Omissions corrected - MMC-1 *does* handle the 2.8-2.9 Volt range - MMC-2 can handle 2.5-3.2 Volt cards, given a transceiver Add transciever support for MMC-2; enable it for Overo and Pandora. (Depends on something else to have set up pinmuxing for control signals instead of as MMC2_DAT4..7 pins.) Also shrink twl4030_hsmmc_info a smidgeon ... padding is all gone. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: mmc-twl4030 fix name buffer length, v2Adrian Hunter2009-03-23
| | | | | | | | | | | | | | | | Add 1 to buffer length for null terminator and use snprintf. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: Add more GPIO mux optionsTony Lindgren2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | This patch adds several new GPIO pins and updates the pin naming comments. The patch is based on earlier patches on linux-omap list by Manikandan Pillai <mani.pillai@ti.com>, Vaibhav Hiremath <hvaibhav@ti.com> and David Brownell <dbrownell@users.sourceforge.net>. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP3: Remove unused CONFIG_I2C2_OMAP_BEAGLEJarkko Nikula2009-03-23
| | | | | | | | | | | | | | | | There is no CONFIG_I2C2_OMAP_BEAGLE in mainline and it is under removal in linux-omap also so remove this dead code now. Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: get rid of OMAP_TAG_USB, v2Felipe Balbi2009-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | OMAP_TAGS should vanish soon since they're not generic arm tags. Most of them can be converted to a platform_data or parsed from a command line like e.g. serial tag. For OMAP_TAG_USB we just let boards call omap_usb_init() passing a pointer to omap_usb_config. Patch updated by Tony for mainline, basically make n770 and h4 compile. Also folded in a fix for OSK by David Brownell <dbrownell@users.sourceforge.net>. Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: No need to include board-overo.h from hardware.hTony Lindgren2009-03-23
| | | | | | | | | | | | | | Move the defines to the associated board file and remove the now unnecessary header file. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: No need to include board-ldp.h from hardware.hTony Lindgren2009-03-23
| | | | | | | | | | | | | | | | Move the defines to the associated board file and remove the now unnecessary header file. Also rename OMAP34XX_ETHR_START to LDP_ETHR_START. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: No need to include board-h4.h from hardware.hTony Lindgren2009-03-23
| | | | | | | | | | | | | | | | Move the defines to the associated board file and remove the now unnecessary header file. Also rename OMAP24XX_ETHR_GPIO_IRQ to H4_ETHR_GPIO_IRQ. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: No need to include board-apollon.h from hardware.hTony Lindgren2009-03-23
| | | | | | | | | | | | | | Move the defines to the associated board file and remove the now unnecessary header file. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * ARM: OMAP: No need to include board-omap2430sdp.h from hardware.hTony Lindgren2009-03-23
| | | | | | | | | | | | | | | | Move the defines to the associated board file and remove the now unnecessary header file. Also rename SDP2430_ETHR_GPIO_IRQ to SDP2430_ETHR_GPIO_IRQ. Signed-off-by: Tony Lindgren <tony@atomide.com>
| * omap mailbox: add save_/restore_ctx() for PMHiroshi DOYU2009-03-23
| | | | | | | | | | | | | | To preserve the registers during off-mode Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
| * omap mailbox: fix empty struct device for omap2Hiroshi DOYU2009-03-23
| | | | | | | | | | Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
| * omap mailbox: print hardware revision at startupHiroshi DOYU2009-03-23
| | | | | | | | | | Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
| * omap mailbox: add initial omap3 supportHiroshi DOYU2009-03-23
| | | | | | | | | | Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
| * omap mailbox: cleanup omap2 register definition with macroHiroshi DOYU2009-03-23
| | | | | | | | | | Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
| * Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2009-03-15
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * master.kernel.org:/home/rmk/linux-2.6-arm: (23 commits) [ARM] Fix virtual to physical translation macro corner cases [ARM] update mach-types [ARM] 5421/1: ftrace: fix crash due to tracing of __naked functions MX1 fix include [ARM] 5419/1: ep93xx: fix build warnings about struct i2c_board_info [ARM] 5418/1: restore lr before leaving mcount ARM: OMAP: board-omap3beagle: set i2c-3 to 100kHz ARM: OMAP: Allow I2C bus driver to be compiled as a module ARM: OMAP: sched_clock() corrected ARM: OMAP: Fix compile error if pm.h is included [ARM] orion5x: pass dram mbus data to xor driver [ARM] S3C64XX: Fix s3c64xx_setrate_clksrc [ARM] S3C64XX: sparse warnings in arch/arm/plat-s3c64xx/irq.c [ARM] S3C64XX: sparse warnings in arch/arm/plat-s3c64xx/s3c6400-clock.c [ARM] S3C64XX: Fix USB host clock mux list [ARM] S3C64XX: Fix name of USB host clock. [ARM] S3C64XX: Rename IRQ_UHOST to IRQ_USBH [ARM] S3C64XX: Do gpiolib configuration earlier [ARM] S3C64XX: Staticise s3c64xx_init_irq_eint() [ARM] SMDK6410: Declare iodesc table static ...
* | | [ARM] acorn,ebsa110,footbridge,integrator,sa1100: Convert asm/io.h to linux/io.hRussell King2009-03-25
| | | | | | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | | Merge branch 'master' of git://git.marvell.com/orion into develRussell King2009-03-19
|\ \ \ | | |/ | |/| | | | | | | | | | Conflicts: arch/arm/mach-mx1/devices.c
| * | ARM: OMAP: board-omap3beagle: set i2c-3 to 100kHzKoen Kooi2009-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Changing it do 100kHz is needed to make more devices works properly. Controlling the TI DLP Pico projector[1] doesn't work properly at 400kHz, 100kHz and lower work fine. EDID readout is unaffected by this change. [1] http://focus.ti.com/dlpdmd/docs/dlpdiscovery.tsp?sectionId=60&tabId=2234 Signed-off-by: Koen Kooi <koen@beagleboard.org> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
* | | Merge branch 'omap-clks3' into develRussell King2009-03-19
|\ \ \ | |_|/ |/| | | | | | | | | | | Conflicts: arch/arm/mach-omap2/clock.c
| * | [ARM] omap: clk_set_parent: deny changing parent if clock is enabledRussell King2009-03-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Richard Woodruff writes: | The historic usage of this has been against single use leaf clocks | (1st instance of gptimer). When it was used it did: | clk_get() | clk_set_parent() | clk_enable() | | This usage was ok for that. Use on a disabled clock is needed. | | If there are multiple users on the clock or it is enabled there are | problems. | | The call can still be unfriendly if 2 different drivers are using the | clock with their own clock get/enable. It might be the function should | return an error if usecount != 0 to stop surprises. It is all around | better if the parenting is done when the clock is off. This is a good reason to ensure that the clock is not enabled when clk_set_parent() is called. Acked-by: Richard Woodruff <r-woodruff2@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] omap: ensure that failing power domain lookups produce errorsRussell King2009-02-23
| | | | | | | | | | | | | | | | | | | | | Use pr_err() for errors rather than pr_debug(). pr_debug() are compiled away unless -DDEBUG is used. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP3 powerdomains: make USBTLL SAR only available on ES3.1 and beyondPaul Walmsley2009-02-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Richard Woodruff writes that chip errata prevent USBTLL SAR from working on OMAP3 ES levels before ES3.1: http://marc.info/?l=linux-arm-kernel&m=123319614808833&w=2 Update the OMAP3 powerdomain structures appropriately. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Richard Woodruff <r-woodruff2@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP3: update ES level flags to discriminate between post-ES2 revisionsPaul Walmsley2009-02-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some OMAP3 chip behaviors change in ES levels after ES2. Modify the existing omap_chip flags to add options for ES3.0 and ES3.1. Add a new macro, CHIP_GE_OMAP3430ES2, to cover ES levels from ES2 onwards - a common pattern for OMAP3 features. Update all current users of the omap_chip macros to use this new macro. Also add CHIP_GE_OMAP3430ES3_1 to cover the USBTLL SAR errata case (described and fixed in the following patch) Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] omap: add support for bypassing DPLLsRussell King2009-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This roughly corresponds with OMAP commits: 7d06c48, 3241b19, 88b5d9b, 18a5500, 9c909ac, 5c6497b, 8b1f0bd, 2ac1da8. For both OMAP2 and OMAP3, we note the reference and bypass clocks in the DPLL data structure. Whenever we modify the DPLL rate, we first ensure that both the reference and bypass clocks are enabled. Then, we decide whether to use the reference and DPLL, or the bypass clock if the desired rate is identical to the bypass rate, and program the DPLL appropriately. Finally, we update the clock's parent, and then disable the unused clocks. This keeps the parents correctly balanced, and more importantly ensures that the bypass clock is running whenever we reprogram the DPLL. This is especially important because the procedure for reprogramming the DPLL involves switching to the bypass clock. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] omap: arrange for clock recalc methods to return the rateRussell King2009-02-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | linux-omap source commit 33d000c99ee393fe2042f93e8422f94976d276ce introduces a way to "dry run" clock changes before they're committed. However, this involves putting logic to handle this into each and every recalc function, and unfortunately due to the caching, led to some bugs. Solve both of issues by making the recalc methods always return the clock rate for the clock, which the caller decides what to do with. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP2/3 clock: don't tinker with hardirqs when they are supposed to be ↵Paul Walmsley2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | disabled Clock rate change code executes inside a spinlock with hardirqs disabled. The only code that should be messing around with the hardirq state should be the plat-omap/clock.c code. In the omap2_reprogram_dpllcore() case, this probably just wastes cycles, but in the omap3_core_dpll_m2_set_rate() case, this is a nasty bug. linux-omap source commit is b9b6208dadb5e0d8b290900a3ffa911673ca97ed. Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] omap: fix clockdomain enable/disable orderingRussell King2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on a patch from Paul Walmsley <paul@pwsan.com>: omap2_clk_enable() should enable a clock's clockdomain before attempting to enable its parent clock's clockdomain. Similarly, in the unlikely event that the parent clock enable fails, the clockdomain should be disabled. linux-omap source commit is 6d6e285e5a7912b1ea68fadac387304c914aaba8. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] omap: fix usecount decrement bugRussell King2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based upon a patch from Paul Walmsley <paul@pwsan.com>: If _omap2_clk_enable() fails, the clock's usecount must be decremented by one no matter whether the clock has a parent or not. but reorganised a bit. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP2/3 clock: convert remaining MPU barriers into OCP barriersPaul Walmsley2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Several parts of the OMAP2/3 clock code use wmb() to try to ensure that the hardware write completes before continuing. This approach is problematic: wmb() only ensures that the write leaves the ARM. It does not ensure that the write actually reaches the endpoint device. The endpoint device in this case - either the PRM, CM, or SCM - is three interconnects away from the ARM - and the final interconnect is low-speed. And the OCP interconnects will post the write, and who knows how long that will take to complete. So the wmb() is not what we want. Worse, the wmb() is indiscriminate; it causes the ARM to flush any other unrelated buffered writes and wait for the local interconnect to acknowledge them - potentially very expensive. Fix this by converting the wmb()s into readbacks of the same PRM/CM/SCM register. Since the PRM/CM/SCM devices use a single OCP thread, this will cause the MPU to block while waiting for posted writes to that device to complete. linux-omap source commit is 260f5487848681b4d8ea7430a709a601bbcb21d1. Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP2xxx clock: consolidate DELAYED_APP clock commits; fix barrierPaul Walmsley2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Consolidate the commit code for DELAYED_APP clocks into a subroutine, _omap2xxx_clk_commit(). Also convert the MPU barrier wmb() into an OCP barrier, since with an MPU barrier, we have no guarantee that the write actually reached the endpoint device. linux-omap source commit is 0f5bdb736515801b296125d16937a21ff7b3cfdc. Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | [ARM] OMAP2/3 clock: don't use a barrier after clk_disable()Paul Walmsley2009-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | clk_disable() previously used an ARM barrier, wmb(), to try to ensure that the hardware write completed before continuing. There are some problems with this approach. The first problem is that wmb() only ensures that the write leaves the ARM -- not that it actually reaches the endpoint device. In this case, the endpoint device - either the PRM, CM, or SCM - is three interconnects away from the ARM, and the final interconnect is low-speed. And the OCP interconnects will post the write, who knows how long that will take to complete. So the wmb() is not really what we want. Worse, the wmb() is indiscriminate; it will cause the ARM to flush any other unrelated buffered writes and wait for the local interconnect to acknowledge them - potentially very expensive. This first problem could be fixed by doing a readback of the same PRM/CM/SCM register. Since these devices use a single OCP thread, this will cause the MPU to wait for the write to complete. But the primary problem is a conceptual one: clk_disable() should not need any kind of barrier. clk_enable() needs one since device driver code must not access a device until its clocks are known to be enabled. But clk_disable() has no such restriction. Since blocking the MPU on a PRM/CM/SCM write can be a very high-latency operation - several hundred MPU cycles - it's worth avoiding this barrier if possible. linux-omap source commit is f4aacad2c0ed1055622d5c1e910befece24ef0e2. Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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