linux/arch/arm/mm
Lennert Buytenhek 1ad77a876d [ARM] 5241/1: provide ioremap_wc()
This patch provides an ARM implementation of ioremap_wc().

We use different page table attributes depending on which CPU we
are running on:

- Non-XScale ARMv5 and earlier systems: The ARMv5 ARM documents four
  possible mapping types (CB=00/01/10/11).  We can't use any of the
  cached memory types (CB=10/11), since that breaks coherency with
  peripheral devices.  Both CB=00 and CB=01 are suitable for _wc, and
  CB=01 (Uncached/Buffered) allows the hardware more freedom than
  CB=00, so we'll use that.

  (The ARMv5 ARM seems to suggest that CB=01 is allowed to delay stores
  but isn't allowed to merge them, but there is no other mapping type
  we can use that allows the hardware to delay and merge stores, so
  we'll go with CB=01.)

- XScale v1/v2 (ARMv5): same as the ARMv5 case above, with the slight
  difference that on these platforms, CB=01 actually _does_ allow
  merging stores.  (If you want noncoalescing bufferable behavior
  on Xscale v1/v2, you need to use XCB=101.)

- Xscale v3 (ARMv5) and ARMv6+: on these systems, we use TEXCB=00100
  mappings (Inner/Outer Uncacheable in xsc3 parlance, Uncached Normal
  in ARMv6 parlance).

  The ARMv6 ARM explicitly says that any accesses to Normal memory can
  be merged, which makes Normal memory more suitable for _wc mappings
  than Device or Strongly Ordered memory, as the latter two mapping
  types are guaranteed to maintain transaction number, size and order.
  We use the Uncached variety of Normal mappings for the same reason
  that we can't use C=1 mappings on ARMv5.

  The xsc3 Architecture Specification documents TEXCB=00100 as being
  Uncacheable and allowing coalescing of writes, which is also just
  what we need.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-06 13:13:44 +01:00
..
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] armv7: add support for ARMv7 cores. 2007-05-08 22:55:53 +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] nommu: abort handler fixup for !CPU_CP15_MMU cores. 2006-09-28 20:15:46 +01:00
alignment.c Use helpers to obtain task pid in printks (arch code) 2007-10-19 11:53:43 -07:00
cache-feroceon-l2.c [ARM] Move include/asm-arm/plat-orion to arch/arm/plat-orion/include/plat 2008-08-09 13:44:58 +02:00
cache-l2x0.c [ARM] 4568/1: fix l2x0 cache invalidate handling of unaligned addresses 2007-09-17 14:56:39 +01:00
cache-v3.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
cache-v4.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
cache-v4wb.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cache-v4wt.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
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 [ARM] armv7: add support for ARMv7 cores. 2007-05-08 22:55:53 +01:00
cache-xsc3l2.c [ARM] pxa: add support for L2 outer cache on XScale3 (attempt 2) 2008-07-28 23:13:09 +01:00
consistent.c ARM: support generic per-device coherent dma mem 2008-07-18 21:14:01 +02:00
context.c Merge branches 'armv7', 'at91', 'misc' and 'omap' into devel 2007-05-09 10:41:28 +01:00
copypage-feroceon.S [ARM] Feroceon: Feroceon-specific WA-cache compatible {copy,clear}_user_page() 2008-04-28 16:06:51 -04:00
copypage-v3.S [ARM] Remove LOADREGS macro 2006-06-25 11:23:45 +01:00
copypage-v4mc.c [ARM] 4078/1: Fix ARM copypage cache coherency problems 2006-12-30 17:05:08 +00:00
copypage-v4wb.S
copypage-v4wt.S
copypage-v6.c [ARM] 4078/1: Fix ARM copypage cache coherency problems 2006-12-30 17:05:08 +00:00
copypage-xsc3.S [ARM] 3377/2: add support for intel xsc3 core 2006-03-28 21:00:40 +01:00
copypage-xscale.c [ARM] 4078/1: Fix ARM copypage cache coherency problems 2006-12-30 17:05:08 +00:00
discontig.c mm: move bootmem descriptors definition to a single place 2008-07-24 10:47:14 -07:00
extable.c
fault-armv.c [ARM] Fix shared mmap when more than two maps of the same file exist 2008-07-27 10:35:54 +01:00
fault.c ARM kprobes: prevent some functions involved with kprobes from being probed 2008-01-26 15:25:17 +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] 5092/1: Fix the I-cache invalidation on ARMv6 and later CPUs 2008-07-03 16:39:57 +01:00
init.c [ARM] initrd: claim initrd memory exclusively 2008-07-30 21:24:56 +01:00
iomap.c iomap: fix 64 bits resources on 32 bits 2008-04-29 08:06:02 -07:00
ioremap.c [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
Kconfig [ARM] pxa: add support for L2 outer cache on XScale3 (attempt 2) 2008-07-28 23:13:09 +01:00
Makefile Merge branch 'pxa' into devel 2008-07-13 12:05:49 +01:00
mm.h [ARM] mm 6: allow mem_types table to specify extended pte attributes 2007-04-21 20:36:02 +01:00
mmap.c [ARM] 4839/1: fixes kernel Oops in /dev/mem device driver for memory map with PHYS_OFF 2008-02-29 22:47:20 +00:00
mmu.c [ARM] 5241/1: provide ioremap_wc() 2008-09-06 13:13:44 +01:00
nommu.c Introduce flags for reserve_bootmem() 2008-02-07 08:42:25 -08:00
pgd.c [ARM] Fix freeing of page tables for ARM in free_pgd_slow 2008-03-01 20:23:57 +00:00
proc-arm6_7.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm7tdmi.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm9tdmi.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm720.S [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
proc-arm740.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm920.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm922.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm925.S [ARM] 5034/1: fix arm{925,926,940,946} dma_flush_range() in WT mode 2008-05-17 22:55:14 +01:00
proc-arm926.S [ARM] 5034/1: fix arm{925,926,940,946} dma_flush_range() in WT mode 2008-05-17 22:55:14 +01:00
proc-arm940.S [ARM] add proc-macros.S include to proc-arm940 and proc-arm946 2008-08-12 19:54:08 +01:00
proc-arm946.S [ARM] add proc-macros.S include to proc-arm940 and proc-arm946 2008-08-12 19:54:08 +01:00
proc-arm1020.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm1020e.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm1022.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-arm1026.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-feroceon.S [ARM] Feroceon: don't disable BPU on boot 2008-07-07 18:38:24 -04:00
proc-macros.S [ARM] armv7: add support for ARMv7 cores. 2007-05-08 22:55:53 +01:00
proc-sa110.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
proc-sa1100.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
proc-syms.c [ARM] 4502/1: nommu: Do not export the copy/clear user page functions 2007-07-20 21:29:51 +01:00
proc-v6.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-v7.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
proc-xsc3.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
proc-xscale.S [ARM] fix 48d7927bdf 2008-04-24 10:06:45 +01:00
tlb-v3.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S [ARM] 4129/1: Add barriers after the TLB operations 2007-02-08 14:49:27 +00:00
tlb-v7.S [ARM] 4394/1: ARMv7: Add the TLB range operations 2007-05-30 14:32:07 +01:00