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ARM: OMAP: hwmod: add support for selecting mpu_irq for each wakeup pad 

By default all registered pads will trigger mpu_irqs[0]. Now there is
an API for selecting used mpu_irq on pad basis, which can be used to
trigger different irq handlers for different pads in the same hwmod.
Each pad that requires its interrupt to be re-routed this way must
have a separate call to omap_hwmod_pad_route_irq(hwmod, pad, irq).

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
[paul@pwsan.com: moved fn to omap_hwmod.c; separated fn from mux scan_wakeups
 changes; added kerneldoc]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Tero Kristo 2011-12-16 14:36:59 -07:00 committed by Paul Walmsley
parent 13a3fe52f7
commit abc2d54563
2 changed files with 57 additions and 0 deletions
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55
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -136,6 +136,7 @@
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <plat/common.h>
#include <plat/cpu.h>
@ -2709,3 +2710,57 @@ int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
return 0;
}
/**
* omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
* @oh: struct omap_hwmod * containing hwmod mux entries
* @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
* @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
*
* When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
* entry number @pad_idx for the hwmod @oh, trigger the interrupt
* service routine for the hwmod's mpu_irqs array index @irq_idx. If
* this function is not called for a given pad_idx, then the ISR
* associated with @oh's first MPU IRQ will be triggered when an I/O
* pad wakeup occurs on that pad. Note that @pad_idx is the index of
* the _dynamic or wakeup_ entry: if there are other entries not
* marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
* entries are NOT COUNTED in the dynamic pad index. This function
* must be called separately for each pad that requires its interrupt
* to be re-routed this way. Returns -EINVAL if there is an argument
* problem or if @oh does not have hwmod mux entries or MPU IRQs;
* returns -ENOMEM if memory cannot be allocated; or 0 upon success.
*
* XXX This function interface is fragile. Rather than using array
* indexes, which are subject to unpredictable change, it should be
* using hwmod IRQ names, and some other stable key for the hwmod mux
* pad records.
*/
int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
{
int nr_irqs;
might_sleep();
if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
pad_idx >= oh->mux->nr_pads_dynamic)
return -EINVAL;
/* Check the number of available mpu_irqs */
for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
;
if (irq_idx >= nr_irqs)
return -EINVAL;
if (!oh->mux->irqs) {
/* XXX What frees this? */
oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
GFP_KERNEL);
if (!oh->mux->irqs)
return -ENOMEM;
}
oh->mux->irqs[pad_idx] = irq_idx;
return 0;
}

2
arch/arm/plat-omap/include/plat/omap_hwmod.h
View File

@ -605,6 +605,8 @@ int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh);
int omap_hwmod_no_setup_reset(struct omap_hwmod *oh);
int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx);
/*
* Chip variant-specific hwmod init routines - XXX should be converted
* to use initcalls once the initial boot ordering is straightened out