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* sh: intc: Fix up initializers for gcc 4.5.Paul Mundt2010-11-091-1/+1
| | | | | | | | The _INTC_ARRAY() initializer presently does a NULL test which blows up as a non-constant initializer under gcc 4.5. This switches over to a type test to account for NULL initializers explicitly. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Switch dynamic IRQ creation to generic irq allocator.Paul Mundt2010-10-261-3/+0
| | | | | | | | | | | Now that the genirq code provides an IRQ bitmap of its own and the necessary API to manipulate it, there's no need to keep our own version around anymore. In the process we kill off some unused IRQ reservation code, with future users now having to tie in to the genirq API as normal. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Split up the INTC code.Paul Mundt2010-10-051-1/+1
| | | | | | | | | | | | | This splits up the sh intc core in to something more vaguely resembling a subsystem. Most of the functionality was alread fairly well compartmentalized, and there were only a handful of interdependencies that needed to be resolved in the process. This also serves as future-proofing for the genirq and sparseirq rework, which will make some of the split out functionality wholly generic, allowing things to be killed off in place with minimal migration pain. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Handle early lookups of subgroup IRQs.Paul Mundt2010-10-051-1/+1
| | | | | | | | | If lookups happen while the radix node still points to a subgroup mapping, an IRQ hasn't yet been made available for the specified id, so error out accordingly. Once the slot is replaced with an IRQ mapping and the tag is discarded, lookup can commence as normal. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Support virtual mappings for IRQ subgroups.Paul Mundt2010-10-051-1/+11
| | | | | | | | | | | | | | | | | | | | Many interrupts that share a single mask source but are on different hardware vectors will have an associated register tied to an INTEVT that denotes the precise cause for the interrupt exception being triggered. This introduces the concept of IRQ subgroups in the intc core, where a virtual IRQ map is constructed for each of the pre-defined cause bits, and a higher level chained handler takes control of the parent INTEVT. This enables CPUs with heavily muxed IRQ vectors (especially across disjoint blocks) to break things out in to a series of managed chained handlers while being able to dynamically lookup and adopt the IRQs created for them. This is largely an opt-in interface, requiring CPUs to manually submit IRQs for subgroup splitting, in addition to providing identifiers in their enum maps that can be used for lazy lookup via the radix tree. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Implement reverse mapping for IRQs to per-controller IDs.Paul Mundt2010-10-051-0/+1
| | | | | | | | | | | | | This implements a scheme roughly analogous to the PowerPC virtual to hardware IRQ mapping, which we use for IRQ to per-controller ID mapping. This makes it possible for drivers to use the IDs directly for lookup instead of hardcoding the vector. The main motivation for this work is as a building block for dynamically allocating virtual IRQs for demuxing INTC events sharing a single INTEVT in addition to a common masking source. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Support early IRQ vector map reservation for delayed controllers.Paul Mundt2010-10-021-0/+1
| | | | | | | | | | Some controllers will need to be initialized lazily due to pinmux constraints, while others may simply have no need to be brought online if there are no backing devices for them attached. In this case it's still necessary to be able to reserve their hardware vector map before dynamic IRQs get a hold of them. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: IRQ auto-distribution support.Paul Mundt2010-04-151-1/+10
| | | | | | | | | | | | | | This implements support for hardware-managed IRQ balancing as implemented by SH-X3 cores (presently only hooked up for SH7786, but can probably be carried over to other SH-X3 cores, too). CPUs need to specify their distribution register along with the mask definitions, as these follow the same format. Peripheral IRQs that don't opt out of balancing will be automatically distributed at the whim of the hardware block, while each CPU needs to verify whether it is handling the IRQ or not, especially before clearing the mask. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: userimask support.Paul Mundt2010-04-131-0/+9
| | | | | | | | | | | This adds support for hardware-assisted userspace irq masking for special priority levels. Due to the SR.IMASK interactivity, only some platforms implement this in hardware (including but not limited to SH-4A interrupt controllers, and ARM-based SH-Mobile CPUs). Each CPU needs to wire this up on its own, for now only SH7786 is wired up as an example. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: INTC ioremap supportMagnus Damm2010-03-191-0/+4
| | | | | | | | | | | | | | Extend the INTC code with ioremap() support V2. Support INTC controllers that are not accessible through a 1:1 virt:phys window. Needed by SH-Mobile ARM INTCS. The INTC code behaves as usual if the io window resource is omitted. The slow phys->virt lookup only happens during setup. The fast path code operates on virtual addresses. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: add INTC out of memory error handlingMagnus Damm2010-03-191-1/+1
| | | | | | | | Extend the INTC code to warn and return an error code in the case of memory allocation failure. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: extend INTC with force_disableMagnus Damm2010-02-161-0/+1
| | | | | | | | | Extend the shared INTC code with force_disable support to allow keeping mask bits statically disabled. Needed for SDHI support to mask out unsupported interrupt sources. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: extend INTC with force_enableMagnus Damm2010-02-091-0/+1
| | | | | | | | | | | | Extend the shared INTC code with force_enable support to allow keeping mask bits statically enabled. Needed by upcoming INTC SDHI patches that mux together a bunch of vectors to a single linux interrupt which is masked by a priority register, but needs individual mask bits constantly enabled. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: extend INTC with struct intc_hw_descMagnus Damm2010-02-091-11/+20
| | | | | | | | | | | | | | | This patch updates the INTC code by moving all vectors, groups and registers from struct intc_desc to struct intc_hw_desc. The idea is that INTC tables should go from using the macro(s) DECLARE_INTC_DESC..() only to using struct intc_desc with name and hw initialized using the macro INTC_HW_DESC(). This move makes it easy to initialize an extended struct intc_desc in the future. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Handle legacy IRQ reservation in vector map.Paul Mundt2009-11-021-0/+3
| | | | | | | | | | | | | Different CPUs will have different starting vectors, with varying amounts of reserved or unusable vector space prior to the first slot. This introduces a legacy vector reservation system that inserts itself in between the CPU vector map registration and the platform specific IRQ setup. This works fine in practice as the only new vectors that boards need to establish on their own should be dynamically allocated rather than arbitrarily assigned. As a plus, this also makes all of the converted platforms sparseirq ready. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: intc: Make ack_regs generally available.Paul Mundt2009-10-271-4/+0
| | | | | | | | | Currently this is ifdef'ed under SH-3 and SH-4A, but there are other CPUs that will need this as well. Given the size of the existing data structures, this doesn't cause any additional cacheline utilization for the existing users, so has no direct impact on the data structures. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Simplify "multi-evt" interrupt handling.Pawel Moll2009-08-241-1/+0
| | | | | | | | | | | | | This patch changes the way in which "multi-evt" interrups are handled. The intc_evt2irq_table and related intc_evt2irq() have been removed and the "redirecting" handler is installed for the coupled interrupts. Thanks to that the do_IRQ() function don't have to use another level of indirection for all the interrupts... Signed-off-by: Pawel Moll <pawel.moll@st.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: multiple vectors per irq - baseMagnus Damm2009-02-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | Instead of keeping the single vector -> single linux irq mapping we extend the intc code to support merging of vectors to a single linux irq. This helps processors such as sh7750, sh7780 and sh7785 which have more vectors than masking ability. With this patch in place we can modify the intc tables to use one irq per maskable irq source. Please note the following: - If multiple vectors share the same enum then only the first vector will be available as a linux irq. - Drivers may need to be rewritten to get pending irq source from the hardware block instead of irq number. This patch together with the sh7785 specific intc tables solves DMA controller irq issues related to buggy interrupt masking. Reported-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Move the shared INTC code out to drivers/sh/Paul Mundt2008-10-011-0/+91
The INTC code will be re-used across different architectures, so move this out to drivers/sh/ and include/linux/sh_intc.h respectively. Signed-off-by: Paul Mundt <lethal@linux-sh.org>