linux-toradex.git/include/linux/irqdomain.h, branch v3.6

irqdomain: Eliminate dedicated radix lookup functions

2012-07-11T15:16:00+00:00

In preparation to remove the slow revmap path, eliminate the public
radix revmap lookup functions.  This simplifies the code and makes the
slowpath removal patch a lot simpler.

Signed-off-by: Grant Likely 
Cc: Paul Mundt 
Cc: Benjamin Herrenschmidt 
Cc: Thomas Gleixner 
Cc: Rob Herring

irqdomain: Support for static IRQ mapping and association.

2012-07-11T15:15:37+00:00

This adds a new strict mapping API for supporting creation of linux IRQs
at existing positions within the domain. The new routines are as follows:

For dynamic allocation and insertion to specified ranges:

	- irq_create_identity_mapping()
	- irq_create_strict_mappings()

These will allocate and associate a range of linux IRQs at the specified
location. This can be used by controllers that have their own static linux IRQ
definitions to map a hwirq range to, as well as for platforms that wish to
establish 1:1 identity mapping between linux and hwirq space.

For insertion to specified ranges by platforms that do their own irq_desc
management:

	- irq_domain_associate()
	- irq_domain_associate_many()

These in turn call back in to the domain's ->map() routine, for further
processing by the platform. Disassociation of IRQs get handled through
irq_dispose_mapping() as normal.

With these in place it should be possible to begin migration of legacy IRQ
domains to linear ones, without requiring special handling for static vs
dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible
for domains with static mappings to adopt whichever tree model best fits
their needs, rather than simply restricting them to linear revmaps.

Signed-off-by: Paul Mundt 
[grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place]
[grant.likely: Add error checking for unallocated irq_descs at associate time]
Signed-off-by: Grant Likely 
Cc: Benjamin Herrenschmidt 
Cc: Thomas Gleixner 
Cc: Rob Herring

irq_domain: Standardise legacy/linear domain selection

2012-07-11T13:59:17+00:00

A large proportion of interrupt controllers that support legacy mappings
do so because non-DT systems need to use fixed IRQ numbers when registering
devices via buses but can otherwise use a linear mapping. The interrupt
controller itself typically is not affected by the mapping used and best
practice is to use a linear mapping where possible so drivers frequently
select at runtime depending on if a legacy range has been allocated to
them.

Standardise this behaviour by providing irq_domain_register_simple() which
will allocate a linear mapping unless a positive first_irq is provided in
which case it will fall back to a legacy mapping. This helps make best
practice for irq_domain adoption clearer.

Signed-off-by: Mark Brown 
Signed-off-by: Grant Likely

irqdomain: Kill off duplicate definitions.

2012-05-19T18:41:56+00:00

Presently irqdomain.h has duplicate definitions for irq_find_host() and
irq_set_default_host(), presumably from merge damage. Kill off the
duplicates.

Signed-off-by: Paul Mundt 
Signed-off-by: Grant Likely

irqdomain: Support removal of IRQ domains.

2012-05-19T18:32:35+00:00

Now that IRQ domains are being used by modules it's necessary to support
removing them, too. This adds a new irq_domain_remove() routine for doing
the bulk of the heavy lifting. It's left as an exercise to the caller to
ensure all mappings have been appropriatey disposed of before attempting
to remove the domain.

Signed-off-by: Paul Mundt 
Signed-off-by: Grant Likely

irq_domain: Move irq_virq_count into NOMAP revmap

2012-04-12T06:37:48+00:00

This patch replaces the old global setting of irq_virq_count that is only
used by the NOMAP mapping and instead uses a revmap_data property so that
the maximum NOMAP allocation can be set per NOMAP irq_domain.

There is exactly one user of irq_virq_count in-tree right now: PS3.
Also, irq_virq_count is only useful for the NOMAP mapping.  So,
instead of having a single global irq_virq_count values, this change
drops it entirely and added a max_irq argument to irq_domain_add_nomap().
That makes it a property of an individual nomap irq domain instead of
a global system settting.

Signed-off-by: Grant Likely 
Tested-by: Benjamin Herrenschmidt 
Cc: Thomas Gleixner 
Cc: Milton Miller

irq: Kill pointless irqd_to_hw export

2012-04-11T04:39:17+00:00

It makes no sense to export this trivial function.  Make it a static inline
instead.

This patch also drops virq_to_hw from arch/c6x since it is unused by that
architecture.

v2: Move irq_hw_number_t into types.h to fix ARM build failure

Signed-off-by: Grant Likely 
Acked-by: Thomas Gleixner 
Cc: Benjamin Herrenschmidt

irq_domain: Centralize definition of irq_dispose_mapping()

2012-02-26T23:48:06+00:00

Several architectures define their own empty irq_dispose_mapping().  Since
the irq_domain code is centralized now, there is little need to do so.  This
patch removes them and creates a new empty copy when !CONFIG_IRQ_DOMAIN is
selected.

The patch also means that IRQ_DOMAIN becomes selectable on all architectures.

Signed-off-by: Grant Likely 
Cc: Rob Herring 
Cc: "David S. Miller" 
Cc: Jonas Bonn 
Cc: sparclinux@vger.kernel.org
Cc: linux@lists.openrisc.net

irq_domain: constify irq_domain_ops

2012-02-16T13:11:24+00:00

Make irq_domain_ops pointer a constant to make it safer for multiple
instances to share the same ops pointer and change the irq_domain code
so that it does not modify the ops.

v4: Fix mismatched type reference in powerpc code

Signed-off-by: Grant Likely 
Cc: Thomas Gleixner 
Cc: Benjamin Herrenschmidt 
Cc: Milton Miller 
Tested-by: Olof Johansson

irq_domain: Create common xlate functions that device drivers can use

2012-02-16T13:11:23+00:00

Rather than having each interrupt controller driver creating its own barely
unique .xlate function for irq_domain, create a library of translators which
any driver can use directly.

v5: - Remove irq_domain_xlate_pci().  It was incorrect.

Signed-off-by: Grant Likely 
Cc: Rob Herring 
Cc: Benjamin Herrenschmidt 
Cc: Mark Salter 
Cc: Thomas Gleixner 
Cc: Milton Miller 
Tested-by: Olof Johansson