blob: 730618f0b149651d11bf6b6f52a7a9f825fd8c48 [file] [log] [blame]
/*
* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <err.h>
#include <sys/types.h>
#include <debug.h>
#include <reg.h>
#include <kernel/thread.h>
#include <platform/interrupts.h>
#include <arch/ops.h>
#include <arch/arm.h>
#include "platform_p.h"
#include <platform/omap5912.h>
struct int_handler_struct {
int_handler handler;
void *arg;
};
static struct int_handler_struct int_handler_table[INT_VECTORS];
static const uint32_t icBase[5] = {
INTCON0_BASE, INTCON1_BASE, INTCON2_BASE, INTCON3_BASE, INTCON4_BASE };
/* a bitmap of the level triggered interrupt vectors */
static uint32_t level_trigger[5] = {
0xb3fefe8f, // level 1 0-31
0xfdb3c1fd, // level 2 0-31
0xfffff7ff, // level 2 32-63
0xbfffffff, // level 2 64-95
0xffffffff // level 2 96-128
};
static inline volatile uint32_t *ICReg(uint controller, uint reg)
{
return (volatile uint32_t *)(icBase[controller] + reg);
}
static inline uint32_t readICReg(uint controller, uint reg)
{
return *ICReg(controller, reg);
}
static inline void writeICReg(uint controller, uint reg, uint val)
{
*ICReg(controller, reg) = val;
}
static inline uint vectorToController(uint vector)
{
return vector / 32;
}
void platform_init_interrupts(void)
{
unsigned int i;
// mask all interrupts
*ICReg(0, INTCON_MIR) = 0xfffffffa;
*ICReg(1, INTCON_MIR) = 0xffffffff;
*ICReg(2, INTCON_MIR) = 0xffffffff;
*ICReg(3, INTCON_MIR) = 0xffffffff;
*ICReg(4, INTCON_MIR) = 0xffffffff;
// set up each of the interrupts
for (i = 0; i < INT_VECTORS; i++) {
// set each vector up as high priority, IRQ, and default edge/level sensitivity
*ICReg(i / 32, INTCON_ILR_BASE + 4*(i%32)) = ((level_trigger[i/32] & (1<<(i%32))) ? (1<<1) : (0<<1)) | 0;
}
// clear any pending interrupts
*ICReg(0, INTCON_ITR) = 0;
*ICReg(1, INTCON_ITR) = 0;
*ICReg(2, INTCON_ITR) = 0;
*ICReg(3, INTCON_ITR) = 0;
*ICReg(4, INTCON_ITR) = 0;
// globally unmask interrupts
*ICReg(1, INTCON_CONTROL) = 3;
*ICReg(0, INTCON_CONTROL) = 3;
*ICReg(0, INTCON_GMR) = 0;
}
status_t mask_interrupt(unsigned int vector)
{
if (vector >= INT_VECTORS)
return ERR_INVALID_ARGS;
// dprintf("%s: vector %d\n", __PRETTY_FUNCTION__, vector);
enter_critical_section();
volatile uint32_t *mir = ICReg(vectorToController(vector), INTCON_MIR);
*mir = *mir | (1<<(vector % 32));
exit_critical_section();
return NO_ERROR;
}
status_t unmask_interrupt(unsigned int vector)
{
if (vector >= INT_VECTORS)
return ERR_INVALID_ARGS;
// dprintf("%s: vector %d\n", __PRETTY_FUNCTION__, vector);
enter_critical_section();
volatile uint32_t *mir = ICReg(vectorToController(vector), INTCON_MIR);
*mir = *mir & ~(1<<(vector % 32));
exit_critical_section();
return NO_ERROR;
}
enum handler_return platform_irq(struct arm_iframe *frame)
{
// get the current vector
unsigned int vector;
#if THREAD_STATS
thread_stats.interrupts++;
#endif
// read from the first level int handler
vector = *ICReg(0, INTCON_SIR_IRQ);
// see if it's coming from the second level handler
if (vector == 0) {
vector = *ICReg(1, INTCON_SIR_IRQ) + 32;
}
// dprintf("platform_irq: spsr 0x%x, pc 0x%x, currthread %p, vector %d\n", frame->spsr, frame->pc, current_thread, vector);
// deliver the interrupt
enum handler_return ret;
ret = INT_NO_RESCHEDULE;
if (int_handler_table[vector].handler)
ret = int_handler_table[vector].handler(int_handler_table[vector].arg);
// ack the interrupt
if (vector >= 32) {
// interrupt is chained, so ack the second level first, and then the first
*ICReg(vector / 32, INTCON_ITR) = ~(1 << (vector % 32));
*ICReg(1, INTCON_CONTROL) |= 1;
vector = 0; // force the following code to ack the chained first level vector
}
*ICReg(0, INTCON_ITR) = ~(1 << vector);
*ICReg(0, INTCON_CONTROL) = 1;
return ret;
}
void platform_fiq(struct arm_iframe *frame)
{
PANIC_UNIMPLEMENTED;
}
void register_int_handler(unsigned int vector, int_handler handler, void *arg)
{
if (vector >= INT_VECTORS)
panic("register_int_handler: vector out of range %d\n", vector);
enter_critical_section();
int_handler_table[vector].handler = handler;
int_handler_table[vector].arg = arg;
exit_critical_section();
}