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/*
* Copyright (C) 2010-2012 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @file mali_osk_irq.c
* Implementation of the OS abstraction layer for the kernel device driver
*/
#include <linux/slab.h> /* For memory allocation */
#include <linux/workqueue.h>
#include <linux/version.h>
#include "mali_osk.h"
#include "mali_kernel_common.h"
#include "mali_kernel_license.h"
#include "mali_kernel_linux.h"
#include "linux/interrupt.h"
typedef struct _mali_osk_irq_t_struct
{
u32 irqnum;
void *data;
_mali_osk_irq_uhandler_t uhandler;
_mali_osk_irq_bhandler_t bhandler;
struct work_struct work_queue_irq_handle; /* Workqueue for the bottom half of the IRQ-handling. This job is activated when this core gets an IRQ.*/
} mali_osk_irq_object_t;
#if MALI_LICENSE_IS_GPL
static struct workqueue_struct *pmm_wq = NULL;
struct workqueue_struct *mali_wq = NULL;
#endif
typedef void (*workqueue_func_t)(void *);
typedef irqreturn_t (*irq_handler_func_t)(int, void *, struct pt_regs *);
static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ); /* , struct pt_regs *regs*/
#if defined(INIT_DELAYED_WORK)
static void irq_handler_bottom_half ( struct work_struct *work );
#else
static void irq_handler_bottom_half ( void * input );
#endif
/**
* Linux kernel version has marked SA_SHIRQ as deprecated, IRQF_SHARED should be used.
* This is to handle older kernels which haven't done this swap.
*/
#ifndef IRQF_SHARED
#define IRQF_SHARED SA_SHIRQ
#endif /* IRQF_SHARED */
_mali_osk_irq_t *_mali_osk_irq_init( u32 irqnum, _mali_osk_irq_uhandler_t uhandler, _mali_osk_irq_bhandler_t bhandler, _mali_osk_irq_trigger_t trigger_func, _mali_osk_irq_ack_t ack_func, void *data, const char *description )
{
mali_osk_irq_object_t *irq_object;
irq_object = kmalloc(sizeof(mali_osk_irq_object_t), GFP_KERNEL);
if (NULL == irq_object) return NULL;
#if MALI_LICENSE_IS_GPL
if (NULL == mali_wq)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
mali_wq = alloc_workqueue("mali", WQ_UNBOUND, 0);
#else
mali_wq = create_workqueue("mali");
#endif
if(NULL == mali_wq)
{
MALI_PRINT_ERROR(("Unable to create Mali workqueue\n"));
kfree(irq_object);
return NULL;
}
}
#endif
/* workqueue API changed in 2.6.20, support both versions: */
#if defined(INIT_DELAYED_WORK)
/* New syntax: INIT_WORK( struct work_struct *work, void (*function)(struct work_struct *)) */
INIT_WORK( &irq_object->work_queue_irq_handle, irq_handler_bottom_half);
#else
/* Old syntax: INIT_WORK( struct work_struct *work, void (*function)(void *), void *data) */
INIT_WORK( &irq_object->work_queue_irq_handle, irq_handler_bottom_half, irq_object);
#endif /* defined(INIT_DELAYED_WORK) */
if (-1 == irqnum)
{
/* Probe for IRQ */
if ( (NULL != trigger_func) && (NULL != ack_func) )
{
unsigned long probe_count = 3;
_mali_osk_errcode_t err;
int irq;
MALI_DEBUG_PRINT(2, ("Probing for irq\n"));
do
{
unsigned long mask;
mask = probe_irq_on();
trigger_func(data);
_mali_osk_time_ubusydelay(5);
irq = probe_irq_off(mask);
err = ack_func(data);
}
while (irq < 0 && (err == _MALI_OSK_ERR_OK) && probe_count--);
if (irq < 0 || (_MALI_OSK_ERR_OK != err)) irqnum = -1;
else irqnum = irq;
}
else irqnum = -1; /* no probe functions, fault */
if (-1 != irqnum)
{
/* found an irq */
MALI_DEBUG_PRINT(2, ("Found irq %d\n", irqnum));
}
else
{
MALI_DEBUG_PRINT(2, ("Probe for irq failed\n"));
}
}
irq_object->irqnum = irqnum;
irq_object->uhandler = uhandler;
irq_object->bhandler = bhandler;
irq_object->data = data;
/* Is this a real IRQ handler we need? */
if (irqnum != _MALI_OSK_IRQ_NUMBER_FAKE && irqnum != _MALI_OSK_IRQ_NUMBER_PMM)
{
if (-1 == irqnum)
{
MALI_DEBUG_PRINT(2, ("No IRQ for core '%s' found during probe\n", description));
kfree(irq_object);
return NULL;
}
if (0 != request_irq(irqnum, irq_handler_upper_half, IRQF_SHARED, description, irq_object))
{
MALI_DEBUG_PRINT(2, ("Unable to install IRQ handler for core '%s'\n", description));
kfree(irq_object);
return NULL;
}
}
#if MALI_LICENSE_IS_GPL
if ( _MALI_OSK_IRQ_NUMBER_PMM == irqnum )
{
pmm_wq = create_singlethread_workqueue("mali-pmm-wq");
}
#endif
return irq_object;
}
void _mali_osk_irq_schedulework( _mali_osk_irq_t *irq )
{
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
#if MALI_LICENSE_IS_GPL
if ( irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
{
queue_work( pmm_wq,&irq_object->work_queue_irq_handle );
}
else
{
queue_work(mali_wq, &irq_object->work_queue_irq_handle);
}
#else
schedule_work(&irq_object->work_queue_irq_handle);
#endif
}
void _mali_osk_flush_workqueue( _mali_osk_irq_t *irq )
{
#if MALI_LICENSE_IS_GPL
if (NULL != irq)
{
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
if(irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
{
flush_workqueue(pmm_wq);
}
else
{
flush_workqueue(mali_wq);
}
}
else
{
flush_workqueue(mali_wq);
}
#endif
}
void _mali_osk_irq_term( _mali_osk_irq_t *irq )
{
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
#if MALI_LICENSE_IS_GPL
if(irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
{
flush_workqueue(pmm_wq);
destroy_workqueue(pmm_wq);
}
#endif
free_irq(irq_object->irqnum, irq_object);
kfree(irq_object);
flush_scheduled_work();
}
/** This function is called directly in interrupt context from the OS just after
* the CPU get the hw-irq from mali, or other devices on the same IRQ-channel.
* It is registered one of these function for each mali core. When an interrupt
* arrives this function will be called equal times as registered mali cores.
* That means that we only check one mali core in one function call, and the
* core we check for each turn is given by the \a dev_id variable.
* If we detect an pending interrupt on the given core, we mask the interrupt
* out by settging the core's IRQ_MASK register to zero.
* Then we schedule the mali_core_irq_handler_bottom_half to run as high priority
* work queue job.
*/
static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ) /* , struct pt_regs *regs*/
{
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)dev_id;
if (irq_object->uhandler(irq_object->data) == _MALI_OSK_ERR_OK)
{
return IRQ_HANDLED;
}
return IRQ_NONE;
}
/* Is executed when an interrupt occur on one core */
/* workqueue API changed in 2.6.20, support both versions: */
#if defined(INIT_DELAYED_WORK)
static void irq_handler_bottom_half ( struct work_struct *work )
#else
static void irq_handler_bottom_half ( void * input )
#endif
{
mali_osk_irq_object_t *irq_object;
#if defined(INIT_DELAYED_WORK)
irq_object = _MALI_OSK_CONTAINER_OF(work, mali_osk_irq_object_t, work_queue_irq_handle);
#else
if ( NULL == input )
{
MALI_PRINT_ERROR(("IRQ: Null pointer! Illegal!"));
return; /* Error */
}
irq_object = (mali_osk_irq_object_t *) input;
#endif
irq_object->bhandler(irq_object->data);
}
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