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linux/arch/arm/mach-omap2
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Paul Walmsley f11fda6a91 [ARM] OMAP2/3 clock: convert remaining MPU barriers into OCP barriers 
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>
2009-02-08 17:50:45 +00:00
..
board-2430sdp.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-apollon.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-generic.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-h4.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-ldp.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-omap3beagle.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
board-omap3pandora.c omap mmc: Add low-level initialization for hsmmc controller 2008-12-10 17:37:17 -08:00
board-overo.c omap mmc: Add low-level initialization for hsmmc controller 2008-12-10 17:37:17 -08:00
clock24xx.c [ARM] omap: create a proper tree of clocks 2009-02-08 17:50:42 +00:00
clock24xx.h [ARM] omap: create a proper tree of clocks 2009-02-08 17:50:42 +00:00
clock34xx.c [ARM] omap: create a proper tree of clocks 2009-02-08 17:50:42 +00:00
clock34xx.h [ARM] omap: create a proper tree of clocks 2009-02-08 17:50:42 +00:00
clock.c [ARM] OMAP2/3 clock: convert remaining MPU barriers into OCP barriers 2009-02-08 17:50:45 +00:00
clock.h [ARM] OMAP: Fix sparse, checkpatch warnings in OMAP2/3 PRCM/PM code 2009-02-08 17:50:24 +00:00
clockdomain.c [ARM] OMAP2/3 clockdomains: autodeps should respect platform flags 2009-02-08 17:50:31 +00:00
clockdomains.h [ARM] OMAP3: PM: Emu_pwrdm is switched off by hardware even when sdti is in use 2009-02-08 17:50:32 +00:00
cm-regbits-24xx.h [ARM] OMAP2 PRCM: clean up CM_IDLEST bits 2009-02-08 17:50:37 +00:00
cm-regbits-34xx.h [ARM] OMAP2 PRCM: clean up CM_IDLEST bits 2009-02-08 17:50:37 +00:00
cm.h [ARM] omap: Fix IO_ADDRESS() macros 2008-09-05 17:02:31 +01:00
control.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
devices.c [ARM] omap: hsmmc: new short connection id names 2009-02-08 17:50:23 +00:00
gpmc.c ARM: OMAP: Fix compiler warnings in gpmc.c 2008-11-04 13:35:06 -08:00
id.c ARM: OMAP: Fix omap34xx revision detection for ES3.1 2009-01-29 08:57:16 -08:00
io.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
irq.c ARM: OMAP: Mask interrupts when disabling interrupts, v2 2009-01-29 09:27:00 -08:00
Kconfig ARM: OMAP3: Add basic support for Pandora handheld console 2008-12-10 17:36:54 -08:00
mailbox.c [ARM] Convert asm/io.h to linux/io.h 2008-09-06 12:10:45 +01:00
Makefile [ARM] OMAP2 SDRC: separate common OMAP2/3 code from OMAP2xxx code 2009-02-08 17:50:39 +00:00
Makefile.boot [ARM] 3145/1: OMAP 3a/5: Add support for omap24xx 2005-11-10 14:26:51 +00:00
mcbsp.c [ARM] omap: mcbsp: convert to use fck/ick clocks directly 2009-02-08 17:50:19 +00:00
mmc-twl4030.c omap mmc: Add low-level initialization for hsmmc controller 2008-12-10 17:37:17 -08:00
mmc-twl4030.h omap mmc: Add low-level initialization for hsmmc controller 2008-12-10 17:37:17 -08:00
mux.c ARM: OMAP3: Pin multiplexing updates for 24xx and 34xx 2008-12-10 17:36:54 -08:00
pm.c [ARM] OMAP: Fix sparse, checkpatch warnings in OMAP2/3 PRCM/PM code 2009-02-08 17:50:24 +00:00
powerdomain.c [ARM] OMAP3 pwrdm: add hardware save-and-restore (SAR) support 2008-08-21 21:26:39 +01:00
powerdomains24xx.h ARM: OMAP2: Powerdomain: Add OMAP2 powerdomains 2008-08-19 11:08:42 +03:00
powerdomains34xx.h [ARM] OMAP3 powerdomains: remove RET from SGX power states list 2009-02-08 17:50:30 +00:00
powerdomains.h [ARM] OMAP3 PRCM: add DPLL1-5 powerdomains, clockdomains; mark clocks 2009-02-08 17:50:30 +00:00
prcm-common.h [ARM] OMAP2 PRCM: clean up CM_IDLEST bits 2009-02-08 17:50:37 +00:00
prcm.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
prm-regbits-24xx.h ARM: OMAP2: Powerdomain: Add OMAP2 powerdomains 2008-08-19 11:08:42 +03:00
prm-regbits-34xx.h [ARM] OMAP34XX: Add miscellaneous definitions related to 34xx 2009-02-08 17:50:36 +00:00
prm.h [ARM] OMAP34XX: Add miscellaneous definitions related to 34xx 2009-02-08 17:50:36 +00:00
sdrc2xxx.c [ARM] OMAP2 SDRC: separate common OMAP2/3 code from OMAP2xxx code 2009-02-08 17:50:39 +00:00
sdrc.c [ARM] OMAP2 SDRC: add SDRAM timing parameter infrastructure 2009-02-08 17:50:39 +00:00
sdrc.h [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
serial.c Merge branch 'omap-all' into devel 2008-10-14 22:24:42 +01:00
sleep24xx.S ARM: OMAP: fix fault in enter_full_retention() 2009-01-29 09:27:00 -08:00
sram34xx.S ARM: OMAP3: Add minimal omap3430 support 2008-10-09 17:51:41 +03:00
sram242x.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
sram243x.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
timer-gp.c ARM: OMAP: gptimer min_delta_ns corrected 2009-01-29 09:27:00 -08:00
usb-tusb6010.c ARM: OMAP: Switch to gpio_request/free calls 2008-12-10 17:35:30 -08:00