240 lines
6.8 KiB
C
240 lines
6.8 KiB
C
/*
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* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained from Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/**
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* @file mali_osk_irq.c
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* Implementation of the OS abstraction layer for the kernel device driver
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*/
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#include <linux/slab.h> /* For memory allocation */
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#include <linux/workqueue.h>
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#include "mali_osk.h"
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#include "mali_kernel_core.h"
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#include "mali_kernel_common.h"
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#include "mali_kernel_license.h"
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#include "linux/interrupt.h"
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typedef struct _mali_osk_irq_t_struct
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{
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u32 irqnum;
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void *data;
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_mali_osk_irq_uhandler_t uhandler;
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_mali_osk_irq_bhandler_t bhandler;
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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.*/
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} mali_osk_irq_object_t;
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#if MALI_LICENSE_IS_GPL
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static struct workqueue_struct *pmm_wq=NULL;
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#endif
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typedef void (*workqueue_func_t)(void *);
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typedef irqreturn_t (*irq_handler_func_t)(int, void *, struct pt_regs *);
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static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ); /* , struct pt_regs *regs*/
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#if defined(INIT_DELAYED_WORK)
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static void irq_handler_bottom_half ( struct work_struct *work );
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#else
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static void irq_handler_bottom_half ( void * input );
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#endif
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/**
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* Linux kernel version has marked SA_SHIRQ as deprecated, IRQF_SHARED should be used.
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* This is to handle older kernels which haven't done this swap.
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*/
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#ifndef IRQF_SHARED
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#define IRQF_SHARED SA_SHIRQ
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#endif /* IRQF_SHARED */
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_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 )
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{
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mali_osk_irq_object_t *irq_object;
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irq_object = kmalloc(sizeof(mali_osk_irq_object_t), GFP_KERNEL);
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if (NULL == irq_object) return NULL;
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/* workqueue API changed in 2.6.20, support both versions: */
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#if defined(INIT_DELAYED_WORK)
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/* New syntax: INIT_WORK( struct work_struct *work, void (*function)(struct work_struct *)) */
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INIT_WORK( &irq_object->work_queue_irq_handle, irq_handler_bottom_half);
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#else
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/* Old syntax: INIT_WORK( struct work_struct *work, void (*function)(void *), void *data) */
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INIT_WORK( &irq_object->work_queue_irq_handle, irq_handler_bottom_half, irq_object);
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#endif /* defined(INIT_DELAYED_WORK) */
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if (-1 == irqnum)
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{
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/* Probe for IRQ */
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if ( (NULL != trigger_func) && (NULL != ack_func) )
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{
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unsigned long probe_count = 3;
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_mali_osk_errcode_t err;
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int irq;
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MALI_DEBUG_PRINT(2, ("Probing for irq\n"));
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do
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{
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unsigned long mask;
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mask = probe_irq_on();
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trigger_func(data);
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_mali_osk_time_ubusydelay(5);
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irq = probe_irq_off(mask);
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err = ack_func(data);
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}
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while (irq < 0 && (err == _MALI_OSK_ERR_OK) && probe_count--);
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if (irq < 0 || (_MALI_OSK_ERR_OK != err)) irqnum = -1;
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else irqnum = irq;
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}
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else irqnum = -1; /* no probe functions, fault */
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if (-1 != irqnum)
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{
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/* found an irq */
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MALI_DEBUG_PRINT(2, ("Found irq %d\n", irqnum));
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}
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else
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{
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MALI_DEBUG_PRINT(2, ("Probe for irq failed\n"));
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}
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}
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irq_object->irqnum = irqnum;
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irq_object->uhandler = uhandler;
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irq_object->bhandler = bhandler;
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irq_object->data = data;
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/* Is this a real IRQ handler we need? */
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if (!mali_benchmark && irqnum != _MALI_OSK_IRQ_NUMBER_FAKE && irqnum != _MALI_OSK_IRQ_NUMBER_PMM)
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{
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if (-1 == irqnum)
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{
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MALI_DEBUG_PRINT(2, ("No IRQ for core '%s' found during probe\n", description));
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kfree(irq_object);
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return NULL;
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}
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if (0 != request_irq(irqnum, irq_handler_upper_half, IRQF_SHARED, description, irq_object))
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{
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MALI_DEBUG_PRINT(2, ("Unable to install IRQ handler for core '%s'\n", description));
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kfree(irq_object);
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return NULL;
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}
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}
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#if MALI_LICENSE_IS_GPL
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if ( _MALI_OSK_IRQ_NUMBER_PMM == irqnum )
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{
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pmm_wq = create_singlethread_workqueue("mali-pmm-wq");
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}
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#endif
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return irq_object;
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}
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void _mali_osk_irq_schedulework( _mali_osk_irq_t *irq )
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{
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mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
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#if MALI_LICENSE_IS_GPL
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if ( irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
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{
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queue_work( pmm_wq,&irq_object->work_queue_irq_handle );
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}
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else
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{
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#endif
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schedule_work(&irq_object->work_queue_irq_handle);
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#if MALI_LICENSE_IS_GPL
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}
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#endif
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}
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void _mali_osk_flush_workqueue( _mali_osk_irq_t *irq )
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{
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#if MALI_LICENSE_IS_GPL
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mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
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if(irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
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{
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flush_workqueue(pmm_wq);
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}
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#endif
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}
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void _mali_osk_irq_term( _mali_osk_irq_t *irq )
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{
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mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
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#if MALI_LICENSE_IS_GPL
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if(irq_object->irqnum == _MALI_OSK_IRQ_NUMBER_PMM )
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{
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flush_workqueue(pmm_wq);
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destroy_workqueue(pmm_wq);
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}
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#endif
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if (!mali_benchmark)
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{
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free_irq(irq_object->irqnum, irq_object);
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}
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kfree(irq_object);
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flush_scheduled_work();
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}
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/** This function is called directly in interrupt context from the OS just after
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* the CPU get the hw-irq from mali, or other devices on the same IRQ-channel.
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* It is registered one of these function for each mali core. When an interrupt
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* arrives this function will be called equal times as registered mali cores.
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* That means that we only check one mali core in one function call, and the
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* core we check for each turn is given by the \a dev_id variable.
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* If we detect an pending interrupt on the given core, we mask the interrupt
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* out by settging the core's IRQ_MASK register to zero.
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* Then we schedule the mali_core_irq_handler_bottom_half to run as high priority
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* work queue job.
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*/
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static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ) /* , struct pt_regs *regs*/
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{
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mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)dev_id;
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if (irq_object->uhandler(irq_object->data) == _MALI_OSK_ERR_OK)
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{
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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/* Is executed when an interrupt occur on one core */
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/* workqueue API changed in 2.6.20, support both versions: */
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#if defined(INIT_DELAYED_WORK)
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static void irq_handler_bottom_half ( struct work_struct *work )
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#else
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static void irq_handler_bottom_half ( void * input )
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#endif
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{
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mali_osk_irq_object_t *irq_object;
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#if defined(INIT_DELAYED_WORK)
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irq_object = _MALI_OSK_CONTAINER_OF(work, mali_osk_irq_object_t, work_queue_irq_handle);
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#else
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if ( NULL == input )
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{
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MALI_PRINT_ERROR(("IRQ: Null pointer! Illegal!"));
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return; /* Error */
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}
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irq_object = (mali_osk_irq_object_t *) input;
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#endif
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irq_object->bhandler(irq_object->data);
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}
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