hw/intc/bcm2835_ic.c - qemu - Git at Google

 /*
  * Raspberry Pi emulation (c) 2012 Gregory Estrade
  * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
  * Heavily based on pl190.c, copyright terms below:
  *
  * Arm PrimeCell PL190 Vector Interrupt Controller
  *
  * Copyright (c) 2006 CodeSourcery.
  * Written by Paul Brook
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */

 #include "qemu/osdep.h"
 #include "hw/intc/bcm2835_ic.h"
 #include "hw/irq.h"
 #include "migration/vmstate.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "trace.h"

 #define GPU_IRQS 64
 #define ARM_IRQS 8

 #define IRQ_PENDING_BASIC       0x00 /* IRQ basic pending */
 #define IRQ_PENDING_1           0x04 /* IRQ pending 1 */
 #define IRQ_PENDING_2           0x08 /* IRQ pending 2 */
 #define FIQ_CONTROL             0x0C /* FIQ register */
 #define IRQ_ENABLE_1            0x10 /* Interrupt enable register 1 */
 #define IRQ_ENABLE_2            0x14 /* Interrupt enable register 2 */
 #define IRQ_ENABLE_BASIC        0x18 /* Base interrupt enable register */
 #define IRQ_DISABLE_1           0x1C /* Interrupt disable register 1 */
 #define IRQ_DISABLE_2           0x20 /* Interrupt disable register 2 */
 #define IRQ_DISABLE_BASIC       0x24 /* Base interrupt disable register */

 /* Update interrupts.  */
 static void bcm2835_ic_update(BCM2835ICState *s)
 {
     bool set = false;

     if (s->fiq_enable) {
         if (s->fiq_select >= GPU_IRQS) {
             /* ARM IRQ */
             set = extract32(s->arm_irq_level, s->fiq_select - GPU_IRQS, 1);
         } else {
             set = extract64(s->gpu_irq_level, s->fiq_select, 1);
         }
     }
     qemu_set_irq(s->fiq, set);

     set = (s->gpu_irq_level & s->gpu_irq_enable)
         || (s->arm_irq_level & s->arm_irq_enable);
     qemu_set_irq(s->irq, set);
 }

 static void bcm2835_ic_set_gpu_irq(void *opaque, int irq, int level)
 {
     BCM2835ICState *s = opaque;

     assert(irq >= 0 && irq < 64);
     trace_bcm2835_ic_set_gpu_irq(irq, level);
     s->gpu_irq_level = deposit64(s->gpu_irq_level, irq, 1, level != 0);
     bcm2835_ic_update(s);
 }

 static void bcm2835_ic_set_arm_irq(void *opaque, int irq, int level)
 {
     BCM2835ICState *s = opaque;

     assert(irq >= 0 && irq < 8);
     trace_bcm2835_ic_set_cpu_irq(irq, level);
     s->arm_irq_level = deposit32(s->arm_irq_level, irq, 1, level != 0);
     bcm2835_ic_update(s);
 }

 static const int irq_dups[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 };

 static uint64_t bcm2835_ic_read(void *opaque, hwaddr offset, unsigned size)
 {
     BCM2835ICState *s = opaque;
     uint32_t res = 0;
     uint64_t gpu_pending = s->gpu_irq_level & s->gpu_irq_enable;
     int i;

     switch (offset) {
     case IRQ_PENDING_BASIC:
         /* bits 0-7: ARM irqs */
         res = s->arm_irq_level & s->arm_irq_enable;

         /* bits 8 & 9: pending registers 1 & 2 */
         res |= (((uint32_t)gpu_pending) != 0) << 8;
         res |= ((gpu_pending >> 32) != 0) << 9;

         /* bits 10-20: selected GPU IRQs */
         for (i = 0; i < ARRAY_SIZE(irq_dups); i++) {
             res |= extract64(gpu_pending, irq_dups[i], 1) << (i + 10);
         }
         break;
     case IRQ_PENDING_1:
         res = gpu_pending;
         break;
     case IRQ_PENDING_2:
         res = gpu_pending >> 32;
         break;
     case FIQ_CONTROL:
         res = (s->fiq_enable << 7) | s->fiq_select;
         break;
     case IRQ_ENABLE_1:
         res = s->gpu_irq_enable;
         break;
     case IRQ_ENABLE_2:
         res = s->gpu_irq_enable >> 32;
         break;
     case IRQ_ENABLE_BASIC:
         res = s->arm_irq_enable;
         break;
     case IRQ_DISABLE_1:
         res = ~s->gpu_irq_enable;
         break;
     case IRQ_DISABLE_2:
         res = ~s->gpu_irq_enable >> 32;
         break;
     case IRQ_DISABLE_BASIC:
         res = ~s->arm_irq_enable;
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
                       __func__, offset);
         return 0;
     }

     return res;
 }

 static void bcm2835_ic_write(void *opaque, hwaddr offset, uint64_t val,
                              unsigned size)
 {
     BCM2835ICState *s = opaque;

     switch (offset) {
     case FIQ_CONTROL:
         s->fiq_select = extract32(val, 0, 7);
         s->fiq_enable = extract32(val, 7, 1);
         break;
     case IRQ_ENABLE_1:
         s->gpu_irq_enable |= val;
         break;
     case IRQ_ENABLE_2:
         s->gpu_irq_enable |= val << 32;
         break;
     case IRQ_ENABLE_BASIC:
         s->arm_irq_enable |= val & 0xff;
         break;
     case IRQ_DISABLE_1:
         s->gpu_irq_enable &= ~val;
         break;
     case IRQ_DISABLE_2:
         s->gpu_irq_enable &= ~(val << 32);
         break;
     case IRQ_DISABLE_BASIC:
         s->arm_irq_enable &= ~val & 0xff;
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
                       __func__, offset);
         return;
     }
     bcm2835_ic_update(s);
 }

 static const MemoryRegionOps bcm2835_ic_ops = {
     .read = bcm2835_ic_read,
     .write = bcm2835_ic_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
 };

 static void bcm2835_ic_reset(DeviceState *d)
 {
     BCM2835ICState *s = BCM2835_IC(d);

     s->gpu_irq_enable = 0;
     s->arm_irq_enable = 0;
     s->fiq_enable = false;
     s->fiq_select = 0;
 }

 static void bcm2835_ic_init(Object *obj)
 {
     BCM2835ICState *s = BCM2835_IC(obj);

     memory_region_init_io(&s->iomem, obj, &bcm2835_ic_ops, s, TYPE_BCM2835_IC,
                           0x200);
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);

     qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_gpu_irq,
                             BCM2835_IC_GPU_IRQ, GPU_IRQS);
     qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_arm_irq,
                             BCM2835_IC_ARM_IRQ, ARM_IRQS);

     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->fiq);
 }

 static const VMStateDescription vmstate_bcm2835_ic = {
     .name = TYPE_BCM2835_IC,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT64(gpu_irq_level, BCM2835ICState),
         VMSTATE_UINT64(gpu_irq_enable, BCM2835ICState),
         VMSTATE_UINT8(arm_irq_level, BCM2835ICState),
         VMSTATE_UINT8(arm_irq_enable, BCM2835ICState),
         VMSTATE_BOOL(fiq_enable, BCM2835ICState),
         VMSTATE_UINT8(fiq_select, BCM2835ICState),
         VMSTATE_END_OF_LIST()
     }
 };

 static void bcm2835_ic_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->reset = bcm2835_ic_reset;
     dc->vmsd = &vmstate_bcm2835_ic;
 }

 static const TypeInfo bcm2835_ic_info = {
     .name          = TYPE_BCM2835_IC,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(BCM2835ICState),
     .class_init    = bcm2835_ic_class_init,
     .instance_init = bcm2835_ic_init,
 };

 static void bcm2835_ic_register_types(void)
 {
     type_register_static(&bcm2835_ic_info);
 }

 type_init(bcm2835_ic_register_types)
	/*
	* Raspberry Pi emulation (c) 2012 Gregory Estrade
	* Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
	* Heavily based on pl190.c, copyright terms below:
	*
	* Arm PrimeCell PL190 Vector Interrupt Controller
	*
	* Copyright (c) 2006 CodeSourcery.
	* Written by Paul Brook
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*/

	#include "qemu/osdep.h"
	#include "hw/intc/bcm2835_ic.h"
	#include "hw/irq.h"
	#include "migration/vmstate.h"
	#include "qemu/log.h"
	#include "qemu/module.h"
	#include "trace.h"

	#define GPU_IRQS 64
	#define ARM_IRQS 8

	#define IRQ_PENDING_BASIC 0x00 /* IRQ basic pending */
	#define IRQ_PENDING_1 0x04 /* IRQ pending 1 */
	#define IRQ_PENDING_2 0x08 /* IRQ pending 2 */
	#define FIQ_CONTROL 0x0C /* FIQ register */
	#define IRQ_ENABLE_1 0x10 /* Interrupt enable register 1 */
	#define IRQ_ENABLE_2 0x14 /* Interrupt enable register 2 */
	#define IRQ_ENABLE_BASIC 0x18 /* Base interrupt enable register */
	#define IRQ_DISABLE_1 0x1C /* Interrupt disable register 1 */
	#define IRQ_DISABLE_2 0x20 /* Interrupt disable register 2 */
	#define IRQ_DISABLE_BASIC 0x24 /* Base interrupt disable register */

	/* Update interrupts. */
	static void bcm2835_ic_update(BCM2835ICState *s)
	{
	bool set = false;

	if (s->fiq_enable) {
	if (s->fiq_select >= GPU_IRQS) {
	/* ARM IRQ */
	set = extract32(s->arm_irq_level, s->fiq_select - GPU_IRQS, 1);
	} else {
	set = extract64(s->gpu_irq_level, s->fiq_select, 1);
	}
	}
	qemu_set_irq(s->fiq, set);

	set = (s->gpu_irq_level & s->gpu_irq_enable)
	\|\| (s->arm_irq_level & s->arm_irq_enable);
	qemu_set_irq(s->irq, set);
	}

	static void bcm2835_ic_set_gpu_irq(void *opaque, int irq, int level)
	{
	BCM2835ICState *s = opaque;

	assert(irq >= 0 && irq < 64);
	trace_bcm2835_ic_set_gpu_irq(irq, level);
	s->gpu_irq_level = deposit64(s->gpu_irq_level, irq, 1, level != 0);
	bcm2835_ic_update(s);
	}

	static void bcm2835_ic_set_arm_irq(void *opaque, int irq, int level)
	{
	BCM2835ICState *s = opaque;

	assert(irq >= 0 && irq < 8);
	trace_bcm2835_ic_set_cpu_irq(irq, level);
	s->arm_irq_level = deposit32(s->arm_irq_level, irq, 1, level != 0);
	bcm2835_ic_update(s);
	}

	static const int irq_dups[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 };

	static uint64_t bcm2835_ic_read(void *opaque, hwaddr offset, unsigned size)
	{
	BCM2835ICState *s = opaque;
	uint32_t res = 0;
	uint64_t gpu_pending = s->gpu_irq_level & s->gpu_irq_enable;
	int i;

	switch (offset) {
	case IRQ_PENDING_BASIC:
	/* bits 0-7: ARM irqs */
	res = s->arm_irq_level & s->arm_irq_enable;

	/* bits 8 & 9: pending registers 1 & 2 */
	res \|= (((uint32_t)gpu_pending) != 0) << 8;
	res \|= ((gpu_pending >> 32) != 0) << 9;

	/* bits 10-20: selected GPU IRQs */
	for (i = 0; i < ARRAY_SIZE(irq_dups); i++) {
	res \|= extract64(gpu_pending, irq_dups[i], 1) << (i + 10);
	}
	break;
	case IRQ_PENDING_1:
	res = gpu_pending;
	break;
	case IRQ_PENDING_2:
	res = gpu_pending >> 32;
	break;
	case FIQ_CONTROL:
	res = (s->fiq_enable << 7) \| s->fiq_select;
	break;
	case IRQ_ENABLE_1:
	res = s->gpu_irq_enable;
	break;
	case IRQ_ENABLE_2:
	res = s->gpu_irq_enable >> 32;
	break;
	case IRQ_ENABLE_BASIC:
	res = s->arm_irq_enable;
	break;
	case IRQ_DISABLE_1:
	res = ~s->gpu_irq_enable;
	break;
	case IRQ_DISABLE_2:
	res = ~s->gpu_irq_enable >> 32;
	break;
	case IRQ_DISABLE_BASIC:
	res = ~s->arm_irq_enable;
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
	__func__, offset);
	return 0;
	}

	return res;
	}

	static void bcm2835_ic_write(void *opaque, hwaddr offset, uint64_t val,
	unsigned size)
	{
	BCM2835ICState *s = opaque;

	switch (offset) {
	case FIQ_CONTROL:
	s->fiq_select = extract32(val, 0, 7);
	s->fiq_enable = extract32(val, 7, 1);
	break;
	case IRQ_ENABLE_1:
	s->gpu_irq_enable \|= val;
	break;
	case IRQ_ENABLE_2:
	s->gpu_irq_enable \|= val << 32;
	break;
	case IRQ_ENABLE_BASIC:
	s->arm_irq_enable \|= val & 0xff;
	break;
	case IRQ_DISABLE_1:
	s->gpu_irq_enable &= ~val;
	break;
	case IRQ_DISABLE_2:
	s->gpu_irq_enable &= ~(val << 32);
	break;
	case IRQ_DISABLE_BASIC:
	s->arm_irq_enable &= ~val & 0xff;
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
	__func__, offset);
	return;
	}
	bcm2835_ic_update(s);
	}

	static const MemoryRegionOps bcm2835_ic_ops = {
	.read = bcm2835_ic_read,
	.write = bcm2835_ic_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid.min_access_size = 4,
	.valid.max_access_size = 4,
	};

	static void bcm2835_ic_reset(DeviceState *d)
	{
	BCM2835ICState *s = BCM2835_IC(d);

	s->gpu_irq_enable = 0;
	s->arm_irq_enable = 0;
	s->fiq_enable = false;
	s->fiq_select = 0;
	}

	static void bcm2835_ic_init(Object *obj)
	{
	BCM2835ICState *s = BCM2835_IC(obj);

	memory_region_init_io(&s->iomem, obj, &bcm2835_ic_ops, s, TYPE_BCM2835_IC,
	0x200);
	sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);

	qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_gpu_irq,
	BCM2835_IC_GPU_IRQ, GPU_IRQS);
	qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_arm_irq,
	BCM2835_IC_ARM_IRQ, ARM_IRQS);

	sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
	sysbus_init_irq(SYS_BUS_DEVICE(s), &s->fiq);
	}

	static const VMStateDescription vmstate_bcm2835_ic = {
	.name = TYPE_BCM2835_IC,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (const VMStateField[]) {
	VMSTATE_UINT64(gpu_irq_level, BCM2835ICState),
	VMSTATE_UINT64(gpu_irq_enable, BCM2835ICState),
	VMSTATE_UINT8(arm_irq_level, BCM2835ICState),
	VMSTATE_UINT8(arm_irq_enable, BCM2835ICState),
	VMSTATE_BOOL(fiq_enable, BCM2835ICState),
	VMSTATE_UINT8(fiq_select, BCM2835ICState),
	VMSTATE_END_OF_LIST()
	}
	};

	static void bcm2835_ic_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->reset = bcm2835_ic_reset;
	dc->vmsd = &vmstate_bcm2835_ic;
	}

	static const TypeInfo bcm2835_ic_info = {
	.name = TYPE_BCM2835_IC,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(BCM2835ICState),
	.class_init = bcm2835_ic_class_init,
	.instance_init = bcm2835_ic_init,
	};

	static void bcm2835_ic_register_types(void)
	{
	type_register_static(&bcm2835_ic_info);
	}

	type_init(bcm2835_ic_register_types)