Commit 13a3fe52 authored by Tero Kristo's avatar Tero Kristo Committed by Paul Walmsley
Browse files

ARM: OMAP2+: mux: add support for PAD wakeup interrupts 



OMAP mux now parses active wakeup events from pad registers and calls
corresponding hwmod ISRs once a wakeup is detected. This is
accomplished by registering an interrupt handler for PRCM IO event,
which is raised every time the HW detects wakeups.

[paul@pwsan.com: This patch is a merge of Govindraj R's "ARM: OMAP2+:
hwmod: Add API to check IO PAD wakeup status" patch, Tero Kristo's
"ARM: OMAP2+: mux: add support for PAD wakeup interrupts" patch, and
part of Tero's "ARM: OMAP: mux: add support for selecting mpu_irq for
each wakeup pad" patch.]

Signed-off-by: default avatarTero Kristo <t-kristo@ti.com>
Cc: Govindraj.R <govindraj.raja@ti.com>
Tested-by: default avatarKevin Hilman <khilman@ti.com>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
[paul@pwsan.com: reduced indentation level; renamed omap_hwmod function;
 improved function documentation; modified to iterate only through dynamic
 pads; modified to skip pads where idle mode doesn't enable wakeups; split
 patches]
Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
parent 91285b6f

arch/arm/mach-omap2/mux.c

+83 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ 
#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/uaccess.h>

#include <linux/irq.h>

#include <linux/interrupt.h>



#include <asm/system.h>
@@ -39,6 +41,7 @@ 


#include "control.h"

#include "mux.h"

#include "prm.h"



#define OMAP_MUX_BASE_OFFSET		0x30	/* Offset from CTRL_BASE */

#define OMAP_MUX_BASE_SZ		0x5ca
@@ -353,6 +356,78 @@ err1: 
	return NULL;

}



/**

 * omap_hwmod_mux_scan_wakeups - omap hwmod scan wakeup pads

 * @hmux: Pads for a hwmod

 * @mpu_irqs: MPU irq array for a hwmod

 *

 * Scans the wakeup status of pads for a single hwmod.  If an irq

 * array is defined for this mux, the parser will call the registered

 * ISRs for corresponding pads, otherwise the parser will stop at the

 * first wakeup active pad and return.  Returns true if there is a

 * pending and non-served wakeup event for the mux, otherwise false.

 */

static bool omap_hwmod_mux_scan_wakeups(struct omap_hwmod_mux_info *hmux,

		struct omap_hwmod_irq_info *mpu_irqs)

{

	int i, irq;

	unsigned int val;

	u32 handled_irqs = 0;



	for (i = 0; i < hmux->nr_pads_dynamic; i++) {

		struct omap_device_pad *pad = hmux->pads_dynamic[i];



		if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP) ||

		    !(pad->idle & OMAP_WAKEUP_EN))

			continue;



		val = omap_mux_read(pad->partition, pad->mux->reg_offset);

		if (!(val & OMAP_WAKEUP_EVENT))

			continue;



		if (!hmux->irqs)

			return true;



		irq = hmux->irqs[i];

		/* make sure we only handle each irq once */

		if (handled_irqs & 1 << irq)

			continue;



		handled_irqs |= 1 << irq;



		generic_handle_irq(mpu_irqs[irq].irq);

	}



	return false;

}



/**

 * _omap_hwmod_mux_handle_irq - Process wakeup events for a single hwmod

 *

 * Checks a single hwmod for every wakeup capable pad to see if there is an

 * active wakeup event. If this is the case, call the corresponding ISR.

 */

static int _omap_hwmod_mux_handle_irq(struct omap_hwmod *oh, void *data)

{

	if (!oh->mux || !oh->mux->enabled)

		return 0;

	if (omap_hwmod_mux_scan_wakeups(oh->mux, oh->mpu_irqs))

		generic_handle_irq(oh->mpu_irqs[0].irq);

	return 0;

}



/**

 * omap_hwmod_mux_handle_irq - Process pad wakeup irqs.

 *

 * Calls a function for each registered omap_hwmod to check

 * pad wakeup statuses.

 */

static irqreturn_t omap_hwmod_mux_handle_irq(int irq, void *unused)

{

	omap_hwmod_for_each(_omap_hwmod_mux_handle_irq, NULL);

	return IRQ_HANDLED;

}



/* Assumes the calling function takes care of locking */

void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)

{
@@ -717,6 +792,7 @@ static void __init omap_mux_free_names(struct omap_mux *m) 
static int __init omap_mux_late_init(void)

{

	struct omap_mux_partition *partition;

	int ret;



	list_for_each_entry(partition, &mux_partitions, node) {

		struct omap_mux_entry *e, *tmp;
@@ -737,6 +813,13 @@ static int __init omap_mux_late_init(void) 
		}

	}



	ret = request_irq(omap_prcm_event_to_irq("io"),

		omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,

			"hwmod_io", omap_mux_late_init);



	if (ret)

		pr_warning("mux: Failed to setup hwmod io irq %d\n", ret);



	omap_mux_dbg_init();



	return 0;

arch/arm/plat-omap/include/plat/omap_hwmod.h

+1 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ struct omap_hwmod_mux_info { 
	struct omap_device_pad		*pads;

	int				nr_pads_dynamic;

	struct omap_device_pad		**pads_dynamic;

	int				*irqs;

	bool				enabled;

};

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