drivers/misc/mediatek/gpu/mt8127/mali/mali/linux/mali_osk_irq.c

   1 /*
   2  * This confidential and proprietary software may be used only as
   3  * authorised by a licensing agreement from ARM Limited
   4  * (C) COPYRIGHT 2008-2013 ARM Limited
   5  * ALL RIGHTS RESERVED
   6  * The entire notice above must be reproduced on all authorised
   7  * copies and copies may only be made to the extent permitted
   8  * by a licensing agreement from ARM Limited.
   9  */
  10
  11 /**
  12  * @file mali_osk_irq.c
  13  * Implementation of the OS abstraction layer for the kernel device driver
  14  */
  15
  16 #include <linux/slab.h> /* For memory allocation */
  17 #include <linux/interrupt.h>
  18 #include <linux/wait.h>
  19 #include <linux/sched.h>
  20
  21 #include "mali_osk.h"
  22 #include "mali_kernel_common.h"
  23
  24 typedef struct _mali_osk_irq_t_struct {
  25         u32 irqnum;
  26         void *data;
  27         _mali_osk_irq_uhandler_t uhandler;
  28 } mali_osk_irq_object_t;
  29
  30 typedef irqreturn_t (*irq_handler_func_t)(int, void *, struct pt_regs *);
  31 static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ); /* , struct pt_regs *regs*/
  32
  33 #if defined(DEBUG)
  34 #if 0
  35
  36 struct test_interrupt_data {
  37         _mali_osk_irq_ack_t ack_func;
  38         void *probe_data;
  39         mali_bool interrupt_received;
  40         wait_queue_head_t wq;
  41 };
  42
  43 static irqreturn_t test_interrupt_upper_half(int port_name, void *dev_id)
  44 {
  45         irqreturn_t ret = IRQ_NONE;
  46         struct test_interrupt_data *data = (struct test_interrupt_data *)dev_id;
  47
  48         if (_MALI_OSK_ERR_OK == data->ack_func(data->probe_data)) {
  49                 data->interrupt_received = MALI_TRUE;
  50                 wake_up(&data->wq);
  51                 ret = IRQ_HANDLED;
  52         }
  53
  54         return ret;
  55 }
  56
  57 static _mali_osk_errcode_t test_interrupt(u32 irqnum,
  58         _mali_osk_irq_trigger_t trigger_func,
  59         _mali_osk_irq_ack_t ack_func,
  60         void *probe_data,
  61         const char *description)
  62 {
  63         unsigned long irq_flags = 0;
  64         struct test_interrupt_data data = {
  65                 .ack_func = ack_func,
  66                 .probe_data = probe_data,
  67                 .interrupt_received = MALI_FALSE,
  68         };
  69
  70 #if defined(CONFIG_MALI_SHARED_INTERRUPTS)
  71         irq_flags |= IRQF_SHARED;
  72 #endif /* defined(CONFIG_MALI_SHARED_INTERRUPTS) */
  73
  74         if (0 != request_irq(irqnum, test_interrupt_upper_half, irq_flags, description, &data)) {
  75                 MALI_DEBUG_PRINT(2, ("Unable to install test IRQ handler for core '%s'\n", description));
  76                 return _MALI_OSK_ERR_FAULT;
  77         }
  78
  79         init_waitqueue_head(&data.wq);
  80
  81         trigger_func(probe_data);
  82         wait_event_timeout(data.wq, data.interrupt_received, 100);
  83
  84         free_irq(irqnum, &data);
  85
  86         if (data.interrupt_received) {
  87                 MALI_DEBUG_PRINT(3, ("%s: Interrupt test OK\n", description));
  88                 return _MALI_OSK_ERR_OK;
  89         } else {
  90                 MALI_PRINT_ERROR(("%s: Failed interrupt test on %u\n", description, irqnum));
  91                 return _MALI_OSK_ERR_FAULT;
  92         }
  93 }
  94 #endif
  95
  96 #endif /* defined(DEBUG) */
  97
  98 _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 )
  99 {
 100         mali_osk_irq_object_t *irq_object;
 101         unsigned long irq_flags = 0;
 102
 103 #if defined(CONFIG_MALI_SHARED_INTERRUPTS)
 104         irq_flags |= IRQF_SHARED;
 105 #endif /* defined(CONFIG_MALI_SHARED_INTERRUPTS) */
 106
 107         irq_object = kmalloc(sizeof(mali_osk_irq_object_t), GFP_KERNEL);
 108         if (NULL == irq_object) {
 109                 return NULL;
 110         }
 111
 112         if (-1 == irqnum) {
 113                 /* Probe for IRQ */
 114                 if ( (NULL != trigger_func) && (NULL != ack_func) ) {
 115                         unsigned long probe_count = 3;
 116                         _mali_osk_errcode_t err;
 117                         int irq;
 118
 119                         MALI_DEBUG_PRINT(2, ("Probing for irq\n"));
 120
 121                         do {
 122                                 unsigned long mask;
 123
 124                                 mask = probe_irq_on();
 125                                 trigger_func(probe_data);
 126
 127                                 _mali_osk_time_ubusydelay(5);
 128
 129                                 irq = probe_irq_off(mask);
 130                                 err = ack_func(probe_data);
 131                         } while (irq < 0 && (err == _MALI_OSK_ERR_OK) && probe_count--);
 132
 133                         if (irq < 0 || (_MALI_OSK_ERR_OK != err)) irqnum = -1;
 134                         else irqnum = irq;
 135                 } else irqnum = -1; /* no probe functions, fault */
 136
 137                 if (-1 != irqnum) {
 138                         /* found an irq */
 139                         MALI_DEBUG_PRINT(2, ("Found irq %d\n", irqnum));
 140                 } else {
 141                         MALI_DEBUG_PRINT(2, ("Probe for irq failed\n"));
 142                 }
 143         }
 144
 145         irq_object->irqnum = irqnum;
 146         irq_object->uhandler = uhandler;
 147         irq_object->data = int_data;
 148
 149         if (-1 == irqnum) {
 150                 MALI_DEBUG_PRINT(2, ("No IRQ for core '%s' found during probe\n", description));
 151                 kfree(irq_object);
 152                 return NULL;
 153         }
 154
 155 #if defined(DEBUG)
 156 #if 0
 157         /* Verify that the configured interrupt settings are working */
 158         if (_MALI_OSK_ERR_OK != test_interrupt(irqnum, trigger_func, ack_func, probe_data, description)) {
 159                 MALI_DEBUG_PRINT(2, ("Test of IRQ handler for core '%s' failed\n", description));
 160                 kfree(irq_object);
 161                 return NULL;
 162         }
 163 #endif
 164 #endif
 165
 166         if (0 != request_irq(irqnum, irq_handler_upper_half, IRQF_TRIGGER_LOW, description, irq_object)) {
 167                 MALI_DEBUG_PRINT(2, ("Unable to install IRQ handler for core '%s'\n", description));
 168                 kfree(irq_object);
 169                 return NULL;
 170         }
 171
 172         return irq_object;
 173 }
 174
 175 void _mali_osk_irq_term( _mali_osk_irq_t *irq )
 176 {
 177         mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)irq;
 178         free_irq(irq_object->irqnum, irq_object);
 179         kfree(irq_object);
 180 }
 181
 182
 183 /** This function is called directly in interrupt context from the OS just after
 184  * the CPU get the hw-irq from mali, or other devices on the same IRQ-channel.
 185  * It is registered one of these function for each mali core. When an interrupt
 186  * arrives this function will be called equal times as registered mali cores.
 187  * That means that we only check one mali core in one function call, and the
 188  * core we check for each turn is given by the \a dev_id variable.
 189  * If we detect an pending interrupt on the given core, we mask the interrupt
 190  * out by settging the core's IRQ_MASK register to zero.
 191  * Then we schedule the mali_core_irq_handler_bottom_half to run as high priority
 192  * work queue job.
 193  */
 194 static irqreturn_t irq_handler_upper_half (int port_name, void* dev_id ) /* , struct pt_regs *regs*/
 195 {
 196         irqreturn_t ret = IRQ_NONE;
 197         mali_osk_irq_object_t *irq_object = (mali_osk_irq_object_t *)dev_id;
 198
 199         if (_MALI_OSK_ERR_OK == irq_object->uhandler(irq_object->data)) {
 200                 ret = IRQ_HANDLED;
 201         }
 202
 203         return ret;
 204 }