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/*
* Copyright (C) 2010-2015 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/interrupt.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include "mali_osk.h"
#include "mali_kernel_common.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*/
#if defined(DEBUG)
struct test_interrupt_data {
_mali_osk_irq_ack_t ack_func;
void *probe_data;
mali_bool interrupt_received;
wait_queue_head_t wq;
};
static irqreturn_t test_interrupt_upper_half(int port_name, void *dev_id)
{
irqreturn_t ret = IRQ_NONE;
struct test_interrupt_data *data = (struct test_interrupt_data *)dev_id;
if (_MALI_OSK_ERR_OK == data->ack_func(data->probe_data)) {
data->interrupt_received = MALI_TRUE;
wake_up(&data->wq);
ret = IRQ_HANDLED;
}
return ret;
}
static _mali_osk_errcode_t test_interrupt(u32 irqnum,
_mali_osk_irq_trigger_t trigger_func,
_mali_osk_irq_ack_t ack_func,
void *probe_data,
const char *description)
{
unsigned long irq_flags = 0;
struct test_interrupt_data data = {
.ack_func = ack_func,
.probe_data = probe_data,
.interrupt_received = MALI_FALSE,
};
#if defined(CONFIG_MALI_SHARED_INTERRUPTS)
irq_flags |= IRQF_SHARED;
#endif /* defined(CONFIG_MALI_SHARED_INTERRUPTS) */
if (0 != request_irq(irqnum, test_interrupt_upper_half, irq_flags, description, &data)) {
MALI_DEBUG_PRINT(2, ("Unable to install test IRQ handler for core '%s'\n", description));
return _MALI_OSK_ERR_FAULT;
}
init_waitqueue_head(&data.wq);
trigger_func(probe_data);
wait_event_timeout(data.wq, data.interrupt_received, 100);
free_irq(irqnum, &data);
if (data.interrupt_received) {
MALI_DEBUG_PRINT(3, ("%s: Interrupt test OK\n", description));
return _MALI_OSK_ERR_OK;
} else {
MALI_PRINT_ERROR(("%s: Failed interrupt test on %u\n", description, irqnum));
return _MALI_OSK_ERR_FAULT;
}
}
#endif /* defined(DEBUG) */
_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 defined(DEBUG)
/* Verify that the configured interrupt settings are working */
if (_MALI_OSK_ERR_OK != test_interrupt(irqnum, trigger_func, ack_func, probe_data, description)) {
MALI_DEBUG_PRINT(2, ("Test of IRQ(%d) handler for core '%s' failed\n", irqnum, description));
kfree(irq_object);
return NULL;
}
#endif
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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