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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 "mali_osk.h"
#include "mali_kernel_common.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_object_t;
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*/
_mali_osk_irq_t *_mali_osk_irq_init( u32 irqnum, _mali_osk_irq_uhandler_t uhandler, void *int_data, _mali_osk_irq_trigger_t trigger_func, _mali_osk_irq_ack_t ack_func, void *probe_data, const char *description )
{
mali_osk_irq_object_t *irq_object;
unsigned long irq_flags = 0;
#if defined(CONFIG_MALI_SHARED_INTERRUPTS)
irq_flags |= IRQF_SHARED;
#endif /* defined(CONFIG_MALI_SHARED_INTERRUPTS) */
irq_object = kmalloc(sizeof(mali_osk_irq_object_t), GFP_KERNEL);
if (NULL == irq_object)
{
return NULL;
}
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(probe_data);
_mali_osk_time_ubusydelay(5);
irq = probe_irq_off(mask);
err = ack_func(probe_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->data = int_data;
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, irq_flags, description, irq_object))
{
MALI_DEBUG_PRINT(2, ("Unable to install IRQ handler for core '%s'\n", description));
kfree(irq_object);
return NULL;
}
return irq_object;
}
void _mali_osk_irq_term( _mali_osk_irq_t *irq )
{
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
free_irq(irq_object->irqnum, irq_object);
kfree(irq_object);
}
/** 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*/
{
irqreturn_t ret = IRQ_NONE;
mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)dev_id;
if (_MALI_OSK_ERR_OK == irq_object->uhandler(irq_object->data))
{
ret = IRQ_HANDLED;
}
return ret;
}
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