linux-toradex.git/arch/powerpc/sysdev/mpic.c, branch v3.3.5

powerpc/mpic: Add in-core support for cascaded MPICs

2011-12-07T02:43:09+00:00

The Cell and PowerMac platforms use virtually identical cascaded-IRQ
setup code, so just merge it into the core.  Ideally this code would
trigger automatically when an MPIC device-node specifies an "interrupts"
property, perhaps even enabling MPIC_SECONDARY along the way.

Unfortunately, Benjamin Herrenschmidt has had bad experiences in the
past with the quality of Apple PowerMac device-trees, so to be safe we
will only try to parse out an IRQ if the MPIC_SECONDARY flag is set by
the caller.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Cache the device-tree node in "struct mpic"

2011-12-07T02:43:08+00:00

Store the node pointer in the MPIC during initialization so that all of
the later operational code can just reuse the cached pointer.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Put "pic-no-reset" test back into the MPIC code

2011-12-07T02:43:08+00:00

There's not really any reason to have this one-liner in a separate
static inline function, given that all the other similar tests are
already in the alloc_mpic() code.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Don't open-code dcr_resource_start

2011-12-07T02:43:08+00:00

Don't open-code the OpenFirmware "dcr-reg" property lookup trying to map
DCR resources.  This makes the code a bit easier to read.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Invert the meaning of MPIC_PRIMARY

2011-12-07T02:43:08+00:00

It turns out that there are only 2 in-tree platforms which use MPICs
which are not "primary":  IBM Cell and PowerMac.  To reduce the
complexity of the typical board setup code, invert the MPIC_PRIMARY bit
into MPIC_SECONDARY.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Search for open-pic device-tree node if NULL

2011-12-07T02:43:07+00:00

Almost all PowerPC platforms use a standard "open-pic" device node so
the mpic_alloc() function now accepts NULL for the device-node.  This
will cause it to perform a default search with of_find_matching_node().

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Save computed phys_addr for board-specific code

2011-12-07T02:43:07+00:00

The MPIC code can already perform an automatic OF address translation
step as part of mpic_alloc(), but several boards need to use that base
address when they perform mpic_assign_isu().

The easiest solution is to save the computed physical address into the
"struct mpic" for later use by the board code.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Assume a device-node was passed in mpic_alloc()

2011-12-07T02:43:07+00:00

All of the existing callers of mpic_alloc() pass in a non-NULL
device-node pointer, so the checks for a NULL device-node may be
removed.

Signed-off-by: Kyle Moffett 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Consolidate mpic_alloc() OF address translation

2011-12-07T02:43:06+00:00

Instead of using the open-coded "reg" property lookup and address
translation in mpic_alloc(), directly call of_address_to_resource().
This includes various workarounds for special cases which the naive
of_address_translate() does not.

Afterwards it is possible to remove the copiously copy-pasted calls to
of_address_translate() from the 85xx/86xx/powermac platforms.

Signed-off-by: Kyle Moffett 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Grant Likely 
Cc: Kumar Gala 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mpic: Remove extra semicolon.

2011-11-25T03:53:25+00:00

The patch below removes an extra semicolon.

Signed-off-by: Justin P. Mattock 
CC: linuxppc-dev@lists.ozlabs.org
CC: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt