linux-toradex.git/arch/microblaze/kernel/intc.c, branch v3.10.2

microblaze: Set the default irq_domain

2013-05-09T07:01:21+00:00

Register the irq_domain created during initialization as the default so
that device drivers can pass NULL to irq_create_mapping and get a
virtual irq to pass to request_irq.

Signed-off-by: Dan Christensen 
Signed-off-by: Michal Simek

microblaze: Fix coding style issues

2013-02-12T10:24:45+00:00

Fix coding style issues reported by checkpatch.pl.

Signed-off-by: Michal Simek

microblaze: Add static qualifiers

2012-12-13T17:15:34+00:00

Adding static to internal variables and functions.

Sparse warnings:
arch/microblaze/kernel/prom.c:55:6: warning:
	symbol 'stdout' was not declared. Should it be static?
arch/microblaze/kernel/prom.c:57:12: warning:
	symbol 'early_init_dt_scan_chosen_serial' was not declared. Should it be static?
  CC      arch/microblaze/kernel/prom.o
arch/microblaze/kernel/intc.c:102:5: warning:
	symbol 'xintc_map' was not declared. Should it be static?
  CC      arch/microblaze/kernel/intc.o

Signed-off-by: Michal Simek

microblaze: Fix intc_enable_or_unmask function

2012-12-13T13:39:00+00:00

Intc_enable_or_unmask() is called at the last stage of handle_level_irq().

This function enables the irq first (Write INTC.SIE) and clear ISR next (Write INTC.IAR).
This would create problems that processor will get into a new interrupt as soon as SIE
is written because the previous level interrupt has been captured by INTC.

If the description bring some puzzles, here is the details of how interrupt is handled
for MicroBlaze after Interrupt signal is detected:
1. disable INTC (INTC.CIE = 1)
2. Acknowledge INTC (INTC.IAR = 1)
3. gets into interrupt source's handler, for example, timer's handler
4. Timer is interrupt handler acknowledge Timer Interrupt Status (Timer.TCSR0[23] = 1), and return
5. Enable INTC (INTC.SIE = 1)
6. Acknowledge INTC (INTC.IAR = 1)

INTC continue to capture source inputs even if INTC is disabled (INTC.IER == 1).
So between the gap of step 2 and step 3, the level interrupt from source makes INTC captures
a new interrupt and thus the INTC.ISR = 1 during step 3, 4, and 5.
When INTC is enabled in step 5, INTC's interrupt output will go high immediately.

In summary, the driver should issue step 6 before step 5.

Signed-off-by: Michal Simek

Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

2012-03-28T01:20:56+00:00

Pull arch/microblaze fixes from Michal Simek

* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: Handle TLB skip size dynamically
  microblaze: Introduce TLB skip size
  microblaze: Improve TLB calculation for small systems
  microblaze: Extend space for compiled-in FDT to 32kB
  microblaze: Clear all MSR flags on the first kernel instruction
  microblaze: Use node name instead of compatible string
  microblaze: Fix mapin_ram function
  microblaze: Highmem support
  microblaze: Use active regions
  microblaze: Show more detailed information about memory
  microblaze: Introduce fixmap
  microblaze: mm: Fix lowmem max memory size limits
  microblaze: mm: Use ZONE_DMA instead of ZONE_NORMAL
  microblaze: trivial: Fix typo fault in timer.c
  microblaze: Use vsprintf extention %pf with builtin_return_address
  microblaze: Add PVR version string for MB 8.20.b and 8.30.a
  microblaze: Fix makefile to work with latest toolchain
  microblaze: Fix typo in early_printk.c

microblaze: Use node name instead of compatible string

2012-03-23T08:28:15+00:00

Change report in bootlog:
Origin:
xlnx,xps-intc-1.00.a #0 at 0xc8000000, num_irq=6, edge=0x4
xlnx,xps-timer-1.00.a #0 at 0xc8004000, irq=2

New:
interrupt-controller #0 at 0xc8000000, num_irq=6, edge=0x4
system-timer #0 at 0xc8004000, irq=2

Signed-off-by: Michal Simek

irq_domain/microblaze: Convert microblaze to use irq_domains

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

This patch converts Microblaze to use the irq_domain remapper and get
away from hard coding the offset between hwirq number and the linux irq
number space.  This also paves the way for multiple interrupt controllers.

v2: Don't enable SPARSE_IRQ and keep NR_IRQS set to 33

Signed-off-by: Grant Likely 
Signed-off-by: Michal Simek 
Cc: Rob Herring 
Cc: John Williams 
Cc: John Linn

microblaze: Change NO_IRQ to 0

2012-01-05T07:29:13+00:00

As has been discussed many times[1], Using NO_IRQ set to anything other
than 0 is bug waiting to happen since many drivers follow the pattern
"if (!irq)" for testing whether or not an irq has been set.

This patch changes the Microblaze NO_IRQ setting from -1 to 0 to bring
it in line with most of the rest of the kernel.  It also prepares for
Microblaze eventually supporting multiple interrupt controllers by
breaking the assumption that hwirq# == Linux IRQ#.  The Linux IRQ
number is just a cookie with no guarantee of a direct relationship
with the hardware irq arrangement.

At this point, Microblaze interrupt handling only supports only one
instance of one kind of interrupt controller (xilinx_intc).  This change
shouldn't affect any architecture code outside of the interrupt
controller driver and the irq_of mapping.

Updated to 3.2 and to use irq_data.hwirq by Rob Herring.
Tested and fixed by Michal Simek.

[1] http://lkml.org/lkml/2005/11/21/221

Signed-off-by: Grant Likely 
Signed-off-by: Rob Herring 
Signed-off-by: Michal Simek

microblaze: intc: Change variable name

2012-01-05T07:22:02+00:00

intr_type is mask - change name.
s/intr_type/intr_mask/g

Signed-off-by: Michal Simek

microblaze: Use of_find_compatible_node for timer and intc

2012-01-05T07:22:01+00:00

Calling of_find_compatible_node instead of calling private code
which does the same.

Signed-off-by: Michal Simek