Paul Walmsley e4707dd3e9 [ARM] 5422/1: ARM: MMU: add a Non-cacheable Normal executable memory type ... This patch adds a Non-cacheable Normal ARM executable memory type, MT_MEMORY_NONCACHED. On OMAP3, this is used for rapid dynamic voltage/frequency scaling in the VDD2 voltage domain. OMAP3's SDRAM controller (SDRC) is in the VDD2 voltage domain, and its clock frequency must change along with voltage. The SDRC clock change code cannot run from SDRAM itself, since SDRAM accesses are paused during the clock change. So the current implementation of the DVFS code executes from OMAP on-chip SRAM, aka "OCM RAM." If the OCM RAM pages are marked as Cacheable, the ARM cache controller will attempt to flush dirty cache lines to the SDRC, so it can fill those lines with OCM RAM instruction code. The problem is that the SDRC is paused during DVFS, and so any SDRAM access causes the ARM MPU subsystem to hang. TI's original solution to this problem was to mark the OCM RAM sections as Strongly Ordered memory, thus preventing caching. This is overkill: since the memory is marked as non-bufferable, OCM RAM writes become needlessly slow. The idea of "Strongly Ordered SRAM" is also conceptually disturbing. Previous LAKML list discussion is here: http://www.spinics.net/lists/arm-kernel/msg54312.html This memory type MT_MEMORY_NONCACHED is used for OCM RAM by a future patch. Cc: Richard Woodruff <r-woodruff2@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		2009-03-12 19:25:02 +00:00
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S	[ARM] CONFIG_CPU_MPCORE -> CONFIG_CPU_32v6K	2006-02-22 21:13:28 +00:00
abort-ev7.S	[ARM] 5227/1: Add the ENDPROC declarations to the .S files	2008-09-01 12:06:34 +01:00
abort-lv4t.S	[ARM] nommu: abort handler fixup for !CPU_CP15_MMU cores.	2006-09-28 20:15:46 +01:00
abort-macro.S
abort-nommu.S	[ARM] 5227/1: Add the ENDPROC declarations to the .S files	2008-09-01 12:06:34 +01:00
alignment.c	Merge branch 'omap3-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 into devel	2008-12-15 22:13:26 +00:00
cache-feroceon-l2.c	[ARM] 5329/1: Feroceon: fix feroceon_l2_inv_range	2008-11-08 23:08:54 +00:00
cache-l2x0.c	[ARM] Convert asm/io.h to linux/io.h	2008-09-06 12:10:45 +01:00
cache-v3.S	[ARM] Remove unnecessary mach/hardware.h includes in arch/arm/mm	2008-11-28 23:20:39 +00:00
cache-v4.S	[ARM] Remove unnecessary mach/hardware.h includes in arch/arm/mm	2008-11-28 23:20:39 +00:00
cache-v4wb.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
cache-v4wt.S	[ARM] Remove unnecessary mach/hardware.h includes in arch/arm/mm	2008-11-28 23:20:39 +00:00
cache-v6.S	[ARM] 3356/1: Workaround for the ARM1136 I-cache invalidation problem	2006-03-10 22:26:47 +00:00
cache-v7.S	ARMv7: Add extra barriers for flush_cache_all compressed/head.S	2008-11-06 13:23:07 +00:00
cache-xsc3l2.c	[ARM] xsc3: fix xsc3_l2_inv_range	2008-11-06 10:48:29 -07:00
context.c	Merge branches 'armv7', 'at91', 'misc' and 'omap' into devel	2007-05-09 10:41:28 +01:00
copypage-feroceon.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
copypage-v3.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
copypage-v4mc.c	[ARM] fix StrongARM-11x0 page copy implementation	2009-01-24 11:41:17 +00:00
copypage-v4wb.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
copypage-v4wt.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
copypage-v6.c	[ARM] clearpage: provide our own clear_user_highpage()	2008-11-27 23:53:48 +00:00
copypage-xsc3.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
copypage-xscale.c	[ARM] fix a couple clear_user_highpage assembly constraints	2008-11-28 15:36:43 +00:00
discontig.c	mm: move bootmem descriptors definition to a single place	2008-07-24 10:47:14 -07:00
dma-mapping.c	NOMMU: Rename ARM's struct vm_region	2009-01-08 12:04:47 +00:00
extable.c	[ARM] Convert asm/uaccess.h to linux/uaccess.h	2008-09-06 11:35:55 +01:00
fault-armv.c	[ARM] 5366/1: fix shared memory coherency with VIVT L1 + L2 caches	2009-01-28 16:55:00 +00:00
fault.c	Merge branch 'mxc-pu-imxfb' of git://pasiphae.extern.pengutronix.de/git/imx/linux-2.6 into devel	2008-12-17 20:04:45 +00:00
fault.h	[ARM] do_bad_area() always takes current and current->active_mm	2006-09-27 16:13:48 +01:00
flush.c	[ARM] cachetype: move definitions to separate header	2008-09-01 12:06:24 +01:00
init.c	[ARM] use asm/sections.h	2008-12-01 11:53:07 +00:00
iomap.c	[ARM] Convert asm/io.h to linux/io.h	2008-09-06 12:10:45 +01:00
ioremap.c	[ARM] fix section-based ioremap	2009-01-25 17:36:34 +00:00
Kconfig	Merge branch 'for-rmk-realview' of git://linux-arm.org/linux-2.6 into devel	2008-12-01 17:53:45 +00:00
Makefile	[ARM] dma: rename consistent.c to dma-mapping.c	2008-09-25 15:59:19 +01:00
mm.h	[ARM] use asm/sections.h	2008-12-01 11:53:07 +00:00
mmap.c	[ARM] sparse: fix several warnings	2008-09-05 14:11:24 +01:00
mmu.c	[ARM] 5422/1: ARM: MMU: add a Non-cacheable Normal executable memory type	2009-03-12 19:25:02 +00:00
nommu.c	[ARM] use asm/sections.h	2008-12-01 11:53:07 +00:00
pgd.c	[ARM] remove memzero()	2008-11-27 12:37:59 +00:00
proc-arm6_7.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm7tdmi.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm9tdmi.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm720.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm740.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm920.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm922.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm925.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm926.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm940.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm946.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm1020.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm1020e.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm1022.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-arm1026.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-feroceon.S	Merge branch 'for-rmk' of git://git.marvell.com/orion	2008-10-09 21:33:07 +01:00
proc-macros.S	[ARM] Remove MT_DEVICE_IXP2000 and associated definitions	2008-10-01 16:41:06 +01:00
proc-sa110.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-sa1100.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
proc-syms.c	[ARM] 5364/1: allow flush_ioremap_region() to be used from modules	2009-01-12 13:51:03 +00:00
proc-v6.S	Modern processors may need to drain the WB before WFI	2008-11-10 14:14:11 +00:00
proc-v7.S	Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6 into devel	2008-11-27 12:42:48 +00:00
proc-xsc3.S	[ARM] pxa: add base PXA935 support due to CPUID change	2008-12-02 14:42:40 +08:00
proc-xscale.S	[ARM] Don't include asm/elf.h in asm code	2008-10-01 16:41:10 +01:00
tlb-v3.S	kbuild: arm - use generic asm-offsets.h support	2005-09-09 21:08:59 +02:00
tlb-v4.S	kbuild: arm - use generic asm-offsets.h support	2005-09-09 21:08:59 +02:00
tlb-v4wb.S	kbuild: arm - use generic asm-offsets.h support	2005-09-09 21:08:59 +02:00
tlb-v4wbi.S	kbuild: arm - use generic asm-offsets.h support	2005-09-09 21:08:59 +02:00
tlb-v6.S	[ARM] 4129/1: Add barriers after the TLB operations	2007-02-08 14:49:27 +00:00
tlb-v7.S	[ARM] 5227/1: Add the ENDPROC declarations to the .S files	2008-09-01 12:06:34 +01:00