linux-toradex.git/arch/arm/kernel/fiq.c, branch v4.10

ARM: convert printk(KERN_* to pr_*

2014-11-21T15:24:50+00:00

Convert many (but not all) printk(KERN_* to pr_* to simplify the code.
We take the opportunity to join some printk lines together so we don't
split the message across several lines, and we also add a few levels
to some messages which were previously missing them.

Tested-by: Andrew Lunn 
Tested-by: Felipe Balbi 
Signed-off-by: Russell King

ARM: 8150/3: fiq: Replace default FIQ handler

2014-09-17T23:35:18+00:00

This patch introduces a new default FIQ handler that is structured in a
similar way to the existing ARM exception handler and result in the FIQ
being handled by C code running on the SVC stack (despite this code run
in the FIQ handler is subject to severe limitations with respect to
locking making normal interaction with the kernel impossible).

This default handler allows concepts that on x86 would be handled using
NMIs to be realized on ARM.

Credit:

    This patch is a near complete re-write of a patch originally
    provided by Anton Vorontsov. Today only a couple of small fragments
    survive, however without Anton's work to build from this patch would
    not exist. Thanks also to Russell King for spoonfeeding me a variety
    of fixes during the review cycle.

Signed-off-by: Daniel Thompson 
Cc: Catalin Marinas 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: 7819/1: fiq: Cast the first argument of flush_icache_range()

2013-08-19T23:11:50+00:00

Commit 2ba85e7af4 (ARM: Fix FIQ code on VIVT CPUs) causes the following build warning:

arch/arm/kernel/fiq.c:92:3: warning: passing argument 1 of 'cpu_cache.coherent_kern_range' makes integer from pointer without a cast [enabled by default]

Cast it as '(unsigned long)base' to avoid the warning.

Signed-off-by: Fabio Estevam 
Signed-off-by: Russell King

ARM: Fix FIQ code on VIVT CPUs

2013-08-08T11:03:29+00:00

Aaro Koskinen reports the following oops:
Installing fiq handler from c001b110, length 0x164
Unable to handle kernel paging request at virtual address ffff1224
pgd = c0004000
[ffff1224] *pgd=00000000, *pte=11fff0cb, *ppte=11fff00a
...
[] (set_fiq_handler+0x0/0x6c) from [] (ams_delta_init_fiq+0xa8/0x160)
 r6:00000164 r5:c001b110 r4:00000000 r3:fefecb4c
[] (ams_delta_init_fiq+0x0/0x160) from [] (ams_delta_init+0xd4/0x114)
 r6:00000000 r5:fffece10 r4:c037a9e0
[] (ams_delta_init+0x0/0x114) from [] (customize_machine+0x24/0x30)

This is because the vectors page is now write-protected, and to change
code in there we must write to its original alias.  Make that change,
and adjust the cache flushing such that the code will become visible
to the instruction stream on VIVT CPUs.

Reported-by: Aaro Koskinen 
Tested-by: Aaro Koskinen 
Signed-off-by: Russell King

ARM: update FIQ support for relocation of vectors

2013-07-31T20:34:56+00:00

FIQ should no longer copy the FIQ code into the user visible vector
page.  Instead, it should use the hidden page.  This change makes
that happen.

Cc: 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: fiq: change FIQ_START to a variable

2012-07-01T13:59:19+00:00

The commit a2be01b (ARM: only include mach/irqs.h for !SPARSE_IRQ)
makes mach/irqs.h only be included for !SPARSE_IRQ build.  There are
a nubmer of platforms have FIQ_START defined in mach/irqs.h for FIQ
support.

  arch/arm/mach-rpc/include/mach/irqs.h:#define FIQ_START         64
  arch/arm/mach-s3c24xx/include/mach/irqs.h:#define FIQ_START             IRQ_EINT0
  arch/arm/plat-mxc/include/mach/irqs.h:#define FIQ_START 0

If SPARSE_IRQ is enabled for any of these platforms, the following
compile error will be seen.

  arch/arm/kernel/fiq.c: In function ‘enable_fiq’:
  arch/arm/kernel/fiq.c:127:19: error: ‘FIQ_START’ undeclared (first use in this function)
  arch/arm/kernel/fiq.c:127:19: note: each undeclared identifier is reported only once for each function it appears in
  arch/arm/kernel/fiq.c: In function ‘disable_fiq’:
  arch/arm/kernel/fiq.c:132:20: error: ‘FIQ_START’ undeclared (first use in this function)

The patch changes fiq code to have init_FIQ take FIQ_START from
platforms as a parameter and assign it to variable fiq_start which
is to replace FIQ_START uses in enable_fiq/disable_fiq.

Signed-off-by: Shawn Guo 
Cc: Kukjin Kim 
Cc: Sascha Hauer 
Cc: Rob Herring 
Acked-by: Russell King

ARM: move CP15 definitions to separate header file

2012-03-28T17:30:01+00:00

Avoid namespace conflicts with drivers over the CP15 definitions by
moving CP15 related prototypes and definitions to a private header
file.

Acked-by: Stephen Warren 
Tested-by: Stephen Warren  [Tegra]
Acked-by: H Hartley Sweeten 
Tested-by: H Hartley Sweeten  [EP93xx]
Acked-by: Nicolas Pitre 
Acked-by: Kukjin Kim 
Signed-off-by: Russell King 
Signed-off-by: David Howells

ARM: 6938/1: fiq: Refactor {get,set}_fiq_regs() for Thumb-2

2011-05-26T09:31:06+00:00

 * To remove the risk of inconvenient register allocation decisions
   by the compiler, these functions are separated out as pure
   assembler.

 * The apcs frame manipulation code is not applicable for Thumb-2
   (and also not easily compatible).  Since it's not essential to
   have a full frame on these leaf assembler functions, the frame
   manipulation is removed, in the interests of simplicity.

 * Split up ldm/stm instructions to be compatible with Thumb-2,
   as well as avoiding instruction forms deprecated on >= ARMv7.

Signed-off-by: Dave Martin 
Reviewed-by: Nicolas Pitre 
Signed-off-by: Russell King

Merge branch 'smp' into misc

2011-01-06T22:32:03+00:00

Conflicts:
	arch/arm/kernel/entry-armv.S
	arch/arm/mm/ioremap.c

ARM: fix /proc/interrupts formatting

2010-12-20T15:07:32+00:00

As per x86, align the initial column according to how many IRQs we
have.  Also, provide an english explaination for the 'LOC:' and
'IPI:' lines.

Reviewed-by: Catalin Marinas 
Signed-off-by: Russell King