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e4707dd3e9
linux/arch/arm/include/asm
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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
..
hardware [ARM] VIC: Update asm/hardware/vic.h with PL192 information 2008-12-15 23:03:10 +00:00
mach [ARM] 5422/1: ARM: MMU: add a Non-cacheable Normal executable memory type 2009-03-12 19:25:02 +00:00
a.out-core.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
a.out.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
assembler.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
atomic.h atomic_t: unify all arch definitions 2009-01-06 15:59:10 -08:00
auxvec.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
bitops.h [ARM] 5339/1: fix __fls() on ARM 2008-12-04 09:21:55 +00:00
bug.h [ARM] 5211/2: fix a couple warnings from BUG() usage 2008-09-01 12:06:27 +01:00
bugs.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
cacheflush.h [ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h 2008-11-29 18:49:55 +00:00
cachetype.h [ARM] Introduce new bitmask based cache type macros 2008-09-25 15:35:28 +01:00
checksum.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
clkdev.h [ARM] clkdev: add generic clkdev infrastructure 2008-11-27 12:38:21 +00:00
cpu-multi32.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
cpu-single.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
cpu.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
cputime.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
cputype.h [ARM] cputype: separate definitions, use them 2008-09-01 12:06:23 +01:00
current.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
delay.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
device.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
div64.h [ARM] 5320/1: fix assembly constraints in implementation of do_div() 2008-10-23 12:53:32 +01:00
dma-mapping.h [ARM] dma: correct dma_supported() implementation 2008-12-13 09:12:07 +00:00
dma.h [ARM] dma: remove dmamode_t typedef 2009-01-02 12:34:55 +00:00
domain.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
ecard.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
elf.h [ARM] 5384/1: unwind: Add stack unwinding support for loadable modules 2009-02-19 11:27:19 +00:00
emergency-restart.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
errno.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
fb.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
fcntl.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
fiq.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
flat.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
floppy.h [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
fpstate.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
ftrace.h ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00
futex.h [ARM] 5218/1: arm: improved futex support 2008-09-01 12:06:26 +01:00
glue.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
gpio.h [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
hardirq.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
hw_irq.h [ARM] Fix circular include dependency with IRQ headers 2008-08-07 09:39:37 +01:00
hwcap.h [ARM] 5388/1: Add hwcap bits for VFPv3 and VFPv3D16 2009-02-12 10:59:44 +00:00
ide.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
io.h [ARM] Add a common typesafe __io implementation 2008-11-30 11:45:54 +00:00
ioctl.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
ioctls.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
ipcbuf.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
irq_regs.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
irq.h [ARM] give RiscPC a NR_IRQS definition and remove default 2008-11-29 19:14:31 +00:00
irqflags.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
Kbuild byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
kdebug.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
kexec.h kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
kgdb.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
kmap_types.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
kprobes.h [ARM] 5206/1: remove kprobe_trap_handler() hack 2008-09-01 12:06:26 +01:00
leds.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
limits.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
linkage.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
local.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
locks.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
mc146818rtc.h [ARM] Convert asm/io.h to linux/io.h 2008-09-06 12:10:45 +01:00
memory.h [ARM] remove a common set of __virt_to_bus definitions 2008-11-28 15:36:49 +00:00
mman.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
mmu_context.h [ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h 2008-11-29 18:49:55 +00:00
mmu.h NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
mmzone.h [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
module.h [ARM] 5384/1: unwind: Add stack unwinding support for loadable modules 2009-02-19 11:27:19 +00:00
msgbuf.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
mtd-xip.h [ARM] move asm/xip.h's mach/hardware.h include to mach/xip.h 2008-12-14 13:22:51 +00:00
mutex.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
nwflash.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
page-nommu.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
page.h Merge branch 'highmem' into devel 2008-11-28 15:39:02 +00:00
param.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
parport.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
pci.h [ARM] Fix PCI_DMA_BUS_IS_PHYS for ARM 2008-09-13 21:35:55 +01:00
percpu.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
pgalloc.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
pgtable-hwdef.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
pgtable-nommu.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
pgtable.h Merge branch 'ptebits' into devel 2008-10-09 21:31:56 +01:00
poll.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
posix_types.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
proc-fns.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
processor.h 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
procinfo.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
ptrace.h [ARM] 5387/1: Add ptrace VFP support on ARM 2009-02-12 10:59:43 +00:00
resource.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
scatterlist.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sections.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
segment.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sembuf.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
serial.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
setup.h [ARM] rationalize memory configuration code some more 2008-11-28 15:36:44 +00:00
shmbuf.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
shmparam.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sigcontext.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
siginfo.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
signal.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sizes.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
smp.h RealView: Use only the shadow mapping of ARM11MPCore local timers 2008-12-01 14:54:57 +00:00
socket.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sockios.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
sparsemem.h [ARM] mm: enable sparsemem on clps7500 and RiscPC 2008-10-01 17:24:04 +01:00
spinlock_types.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
spinlock.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
stacktrace.h [ARM] 5382/1: unwind: Reorganise the stacktrace support 2009-02-12 13:21:17 +00:00
stat.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
statfs.h ARM: Use <asm-generic/statfs.h> 2008-09-04 09:46:11 +01:00
string.h [ARM] remove memzero() 2008-11-27 12:37:59 +00:00
suspend.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
swab.h arm: introduce asm/swab.h 2009-01-06 18:10:28 -08:00
system.h [ARM] asm/system.h does not require asm/memory.h 2008-11-28 23:20:38 +00:00
termbits.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
termios.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
therm.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
thread_info.h [ARM] 5382/1: unwind: Reorganise the stacktrace support 2009-02-12 13:21:17 +00:00
thread_notify.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
timex.h [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
tlb.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
tlbflush.h [ARM] 5192/1: ARM TLB: add v7wbi_{possible,always}_flags to {possible,always}_tlb_flags 2008-08-12 19:54:08 +01:00
topology.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
traps.h [ARM] 5381/1: unwind: Reorganise the traps.c code 2009-02-12 13:21:15 +00:00
types.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
uaccess.h [ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h 2008-11-29 18:49:55 +00:00
ucontext.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
unaligned.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
unistd.h [ARM] 5193/1: Wire up missing syscalls 2008-08-12 19:54:07 +01:00
unwind.h [ARM] 5383/2: unwind: Add core support for ARM stack unwinding 2009-02-19 11:26:24 +00:00
user.h [ARM] 5387/1: Add ptrace VFP support on ARM 2009-02-12 10:59:43 +00:00
vfp.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
vfpmacros.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00
vga.h [ARM] Convert asm/io.h to linux/io.h 2008-09-06 12:10:45 +01:00
xor.h [ARM] move include/asm-arm to arch/arm/include/asm 2008-08-02 21:32:35 +01:00