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

 /*
  * QEMU GRLIB IRQMP Emulator
  *
  * (Multiprocessor and extended interrupt not supported)
  *
  * Copyright (c) 2010-2019 AdaCore
  *
  * 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 "qemu/osdep.h"
 #include "hw/irq.h"
 #include "hw/sysbus.h"

 #include "hw/qdev-properties.h"
 #include "hw/sparc/grlib.h"

 #include "trace.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "qom/object.h"

 #define IRQMP_MAX_CPU 16
 #define IRQMP_REG_SIZE 256      /* Size of memory mapped registers */

 /* Memory mapped register offsets */
 #define LEVEL_OFFSET     0x00
 #define PENDING_OFFSET   0x04
 #define FORCE0_OFFSET    0x08
 #define CLEAR_OFFSET     0x0C
 #define MP_STATUS_OFFSET 0x10
 #define BROADCAST_OFFSET 0x14
 #define MASK_OFFSET      0x40
 #define FORCE_OFFSET     0x80
 #define EXTENDED_OFFSET  0xC0

 #define MAX_PILS 16

 OBJECT_DECLARE_SIMPLE_TYPE(IRQMP, GRLIB_IRQMP)

 typedef struct IRQMPState IRQMPState;

 struct IRQMP {
     SysBusDevice parent_obj;

     MemoryRegion iomem;

     IRQMPState *state;
     qemu_irq irq;
 };

 struct IRQMPState {
     uint32_t level;
     uint32_t pending;
     uint32_t clear;
     uint32_t broadcast;

     uint32_t mask[IRQMP_MAX_CPU];
     uint32_t force[IRQMP_MAX_CPU];
     uint32_t extended[IRQMP_MAX_CPU];

     IRQMP    *parent;
 };

 static void grlib_irqmp_check_irqs(IRQMPState *state)
 {
     uint32_t      pend   = 0;
     uint32_t      level0 = 0;
     uint32_t      level1 = 0;

     assert(state != NULL);
     assert(state->parent != NULL);

     /* IRQ for CPU 0 (no SMP support) */
     pend = (state->pending | state->force[0])
         & state->mask[0];

     level0 = pend & ~state->level;
     level1 = pend &  state->level;

     trace_grlib_irqmp_check_irqs(state->pending, state->force[0],
                                  state->mask[0], level1, level0);

     /* Trigger level1 interrupt first and level0 if there is no level1 */
     qemu_set_irq(state->parent->irq, level1 ?: level0);
 }

 static void grlib_irqmp_ack_mask(IRQMPState *state, uint32_t mask)
 {
     /* Clear registers */
     state->pending  &= ~mask;
     state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */

     grlib_irqmp_check_irqs(state);
 }

 void grlib_irqmp_ack(DeviceState *dev, int intno)
 {
     IRQMP        *irqmp = GRLIB_IRQMP(dev);
     IRQMPState   *state;
     uint32_t      mask;

     state = irqmp->state;
     assert(state != NULL);

     intno &= 15;
     mask = 1 << intno;

     trace_grlib_irqmp_ack(intno);

     grlib_irqmp_ack_mask(state, mask);
 }

 static void grlib_irqmp_set_irq(void *opaque, int irq, int level)
 {
     IRQMP      *irqmp = GRLIB_IRQMP(opaque);
     IRQMPState *s;
     int         i = 0;

     s = irqmp->state;
     assert(s         != NULL);
     assert(s->parent != NULL);


     if (level) {
         trace_grlib_irqmp_set_irq(irq);

         if (s->broadcast & 1 << irq) {
             /* Broadcasted IRQ */
             for (i = 0; i < IRQMP_MAX_CPU; i++) {
                 s->force[i] |= 1 << irq;
             }
         } else {
             s->pending |= 1 << irq;
         }
         grlib_irqmp_check_irqs(s);

     }
 }

 static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
                                  unsigned size)
 {
     IRQMP      *irqmp = opaque;
     IRQMPState *state;

     assert(irqmp != NULL);
     state = irqmp->state;
     assert(state != NULL);

     addr &= 0xff;

     /* global registers */
     switch (addr) {
     case LEVEL_OFFSET:
         return state->level;

     case PENDING_OFFSET:
         return state->pending;

     case FORCE0_OFFSET:
         /* This register is an "alias" for the force register of CPU 0 */
         return state->force[0];

     case CLEAR_OFFSET:
     case MP_STATUS_OFFSET:
         /* Always read as 0 */
         return 0;

     case BROADCAST_OFFSET:
         return state->broadcast;

     default:
         break;
     }

     /* mask registers */
     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
         int cpu = (addr - MASK_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         return state->mask[cpu];
     }

     /* force registers */
     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
         int cpu = (addr - FORCE_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         return state->force[cpu];
     }

     /* extended (not supported) */
     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
         int cpu = (addr - EXTENDED_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         return state->extended[cpu];
     }

     trace_grlib_irqmp_readl_unknown(addr);
     return 0;
 }

 static void grlib_irqmp_write(void *opaque, hwaddr addr,
                               uint64_t value, unsigned size)
 {
     IRQMP      *irqmp = opaque;
     IRQMPState *state;

     assert(irqmp != NULL);
     state = irqmp->state;
     assert(state != NULL);

     addr &= 0xff;

     /* global registers */
     switch (addr) {
     case LEVEL_OFFSET:
         value &= 0xFFFF << 1; /* clean up the value */
         state->level = value;
         return;

     case PENDING_OFFSET:
         /* Read Only */
         return;

     case FORCE0_OFFSET:
         /* This register is an "alias" for the force register of CPU 0 */

         value &= 0xFFFE; /* clean up the value */
         state->force[0] = value;
         grlib_irqmp_check_irqs(irqmp->state);
         return;

     case CLEAR_OFFSET:
         value &= ~1; /* clean up the value */
         grlib_irqmp_ack_mask(state, value);
         return;

     case MP_STATUS_OFFSET:
         /* Read Only (no SMP support) */
         return;

     case BROADCAST_OFFSET:
         value &= 0xFFFE; /* clean up the value */
         state->broadcast = value;
         return;

     default:
         break;
     }

     /* mask registers */
     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
         int cpu = (addr - MASK_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         value &= ~1; /* clean up the value */
         state->mask[cpu] = value;
         grlib_irqmp_check_irqs(irqmp->state);
         return;
     }

     /* force registers */
     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
         int cpu = (addr - FORCE_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         uint32_t force = value & 0xFFFE;
         uint32_t clear = (value >> 16) & 0xFFFE;
         uint32_t old   = state->force[cpu];

         state->force[cpu] = (old | force) & ~clear;
         grlib_irqmp_check_irqs(irqmp->state);
         return;
     }

     /* extended (not supported) */
     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
         int cpu = (addr - EXTENDED_OFFSET) / 4;
         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

         value &= 0xF; /* clean up the value */
         state->extended[cpu] = value;
         return;
     }

     trace_grlib_irqmp_writel_unknown(addr, value);
 }

 static const MemoryRegionOps grlib_irqmp_ops = {
     .read = grlib_irqmp_read,
     .write = grlib_irqmp_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
 };

 static void grlib_irqmp_reset(DeviceState *d)
 {
     IRQMP *irqmp = GRLIB_IRQMP(d);
     assert(irqmp->state != NULL);

     memset(irqmp->state, 0, sizeof *irqmp->state);
     irqmp->state->parent = irqmp;
 }

 static void grlib_irqmp_init(Object *obj)
 {
     IRQMP *irqmp = GRLIB_IRQMP(obj);
     SysBusDevice *dev = SYS_BUS_DEVICE(obj);

     qdev_init_gpio_in(DEVICE(obj), grlib_irqmp_set_irq, MAX_PILS);
     qdev_init_gpio_out_named(DEVICE(obj), &irqmp->irq, "grlib-irq", 1);
     memory_region_init_io(&irqmp->iomem, obj, &grlib_irqmp_ops, irqmp,
                           "irqmp", IRQMP_REG_SIZE);

     irqmp->state = g_malloc0(sizeof *irqmp->state);

     sysbus_init_mmio(dev, &irqmp->iomem);
 }

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

     dc->reset = grlib_irqmp_reset;
 }

 static const TypeInfo grlib_irqmp_info = {
     .name          = TYPE_GRLIB_IRQMP,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(IRQMP),
     .instance_init = grlib_irqmp_init,
     .class_init    = grlib_irqmp_class_init,
 };

 static void grlib_irqmp_register_types(void)
 {
     type_register_static(&grlib_irqmp_info);
 }

 type_init(grlib_irqmp_register_types)
	/*
	* QEMU GRLIB IRQMP Emulator
	*
	* (Multiprocessor and extended interrupt not supported)
	*
	* Copyright (c) 2010-2019 AdaCore
	*
	* 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 "qemu/osdep.h"
	#include "hw/irq.h"
	#include "hw/sysbus.h"

	#include "hw/qdev-properties.h"
	#include "hw/sparc/grlib.h"

	#include "trace.h"
	#include "qapi/error.h"
	#include "qemu/module.h"
	#include "qom/object.h"

	#define IRQMP_MAX_CPU 16
	#define IRQMP_REG_SIZE 256 /* Size of memory mapped registers */

	/* Memory mapped register offsets */
	#define LEVEL_OFFSET 0x00
	#define PENDING_OFFSET 0x04
	#define FORCE0_OFFSET 0x08
	#define CLEAR_OFFSET 0x0C
	#define MP_STATUS_OFFSET 0x10
	#define BROADCAST_OFFSET 0x14
	#define MASK_OFFSET 0x40
	#define FORCE_OFFSET 0x80
	#define EXTENDED_OFFSET 0xC0

	#define MAX_PILS 16

	OBJECT_DECLARE_SIMPLE_TYPE(IRQMP, GRLIB_IRQMP)

	typedef struct IRQMPState IRQMPState;

	struct IRQMP {
	SysBusDevice parent_obj;

	MemoryRegion iomem;

	IRQMPState *state;
	qemu_irq irq;
	};

	struct IRQMPState {
	uint32_t level;
	uint32_t pending;
	uint32_t clear;
	uint32_t broadcast;

	uint32_t mask[IRQMP_MAX_CPU];
	uint32_t force[IRQMP_MAX_CPU];
	uint32_t extended[IRQMP_MAX_CPU];

	IRQMP *parent;
	};

	static void grlib_irqmp_check_irqs(IRQMPState *state)
	{
	uint32_t pend = 0;
	uint32_t level0 = 0;
	uint32_t level1 = 0;

	assert(state != NULL);
	assert(state->parent != NULL);

	/* IRQ for CPU 0 (no SMP support) */
	pend = (state->pending \| state->force[0])
	& state->mask[0];

	level0 = pend & ~state->level;
	level1 = pend & state->level;

	trace_grlib_irqmp_check_irqs(state->pending, state->force[0],
	state->mask[0], level1, level0);

	/* Trigger level1 interrupt first and level0 if there is no level1 */
	qemu_set_irq(state->parent->irq, level1 ?: level0);
	}

	static void grlib_irqmp_ack_mask(IRQMPState *state, uint32_t mask)
	{
	/* Clear registers */
	state->pending &= ~mask;
	state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */

	grlib_irqmp_check_irqs(state);
	}

	void grlib_irqmp_ack(DeviceState *dev, int intno)
	{
	IRQMP *irqmp = GRLIB_IRQMP(dev);
	IRQMPState *state;
	uint32_t mask;

	state = irqmp->state;
	assert(state != NULL);

	intno &= 15;
	mask = 1 << intno;

	trace_grlib_irqmp_ack(intno);

	grlib_irqmp_ack_mask(state, mask);
	}

	static void grlib_irqmp_set_irq(void *opaque, int irq, int level)
	{
	IRQMP *irqmp = GRLIB_IRQMP(opaque);
	IRQMPState *s;
	int i = 0;

	s = irqmp->state;
	assert(s != NULL);
	assert(s->parent != NULL);


	if (level) {
	trace_grlib_irqmp_set_irq(irq);

	if (s->broadcast & 1 << irq) {
	/* Broadcasted IRQ */
	for (i = 0; i < IRQMP_MAX_CPU; i++) {
	s->force[i] \|= 1 << irq;
	}
	} else {
	s->pending \|= 1 << irq;
	}
	grlib_irqmp_check_irqs(s);

	}
	}

	static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	IRQMP *irqmp = opaque;
	IRQMPState *state;

	assert(irqmp != NULL);
	state = irqmp->state;
	assert(state != NULL);

	addr &= 0xff;

	/* global registers */
	switch (addr) {
	case LEVEL_OFFSET:
	return state->level;

	case PENDING_OFFSET:
	return state->pending;

	case FORCE0_OFFSET:
	/* This register is an "alias" for the force register of CPU 0 */
	return state->force[0];

	case CLEAR_OFFSET:
	case MP_STATUS_OFFSET:
	/* Always read as 0 */
	return 0;

	case BROADCAST_OFFSET:
	return state->broadcast;

	default:
	break;
	}

	/* mask registers */
	if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
	int cpu = (addr - MASK_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	return state->mask[cpu];
	}

	/* force registers */
	if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
	int cpu = (addr - FORCE_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	return state->force[cpu];
	}

	/* extended (not supported) */
	if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
	int cpu = (addr - EXTENDED_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	return state->extended[cpu];
	}

	trace_grlib_irqmp_readl_unknown(addr);
	return 0;
	}

	static void grlib_irqmp_write(void *opaque, hwaddr addr,
	uint64_t value, unsigned size)
	{
	IRQMP *irqmp = opaque;
	IRQMPState *state;

	assert(irqmp != NULL);
	state = irqmp->state;
	assert(state != NULL);

	addr &= 0xff;

	/* global registers */
	switch (addr) {
	case LEVEL_OFFSET:
	value &= 0xFFFF << 1; /* clean up the value */
	state->level = value;
	return;

	case PENDING_OFFSET:
	/* Read Only */
	return;

	case FORCE0_OFFSET:
	/* This register is an "alias" for the force register of CPU 0 */

	value &= 0xFFFE; /* clean up the value */
	state->force[0] = value;
	grlib_irqmp_check_irqs(irqmp->state);
	return;

	case CLEAR_OFFSET:
	value &= ~1; /* clean up the value */
	grlib_irqmp_ack_mask(state, value);
	return;

	case MP_STATUS_OFFSET:
	/* Read Only (no SMP support) */
	return;

	case BROADCAST_OFFSET:
	value &= 0xFFFE; /* clean up the value */
	state->broadcast = value;
	return;

	default:
	break;
	}

	/* mask registers */
	if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
	int cpu = (addr - MASK_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	value &= ~1; /* clean up the value */
	state->mask[cpu] = value;
	grlib_irqmp_check_irqs(irqmp->state);
	return;
	}

	/* force registers */
	if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
	int cpu = (addr - FORCE_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	uint32_t force = value & 0xFFFE;
	uint32_t clear = (value >> 16) & 0xFFFE;
	uint32_t old = state->force[cpu];

	state->force[cpu] = (old \| force) & ~clear;
	grlib_irqmp_check_irqs(irqmp->state);
	return;
	}

	/* extended (not supported) */
	if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
	int cpu = (addr - EXTENDED_OFFSET) / 4;
	assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);

	value &= 0xF; /* clean up the value */
	state->extended[cpu] = value;
	return;
	}

	trace_grlib_irqmp_writel_unknown(addr, value);
	}

	static const MemoryRegionOps grlib_irqmp_ops = {
	.read = grlib_irqmp_read,
	.write = grlib_irqmp_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid = {
	.min_access_size = 4,
	.max_access_size = 4,
	},
	};

	static void grlib_irqmp_reset(DeviceState *d)
	{
	IRQMP *irqmp = GRLIB_IRQMP(d);
	assert(irqmp->state != NULL);

	memset(irqmp->state, 0, sizeof *irqmp->state);
	irqmp->state->parent = irqmp;
	}

	static void grlib_irqmp_init(Object *obj)
	{
	IRQMP *irqmp = GRLIB_IRQMP(obj);
	SysBusDevice *dev = SYS_BUS_DEVICE(obj);

	qdev_init_gpio_in(DEVICE(obj), grlib_irqmp_set_irq, MAX_PILS);
	qdev_init_gpio_out_named(DEVICE(obj), &irqmp->irq, "grlib-irq", 1);
	memory_region_init_io(&irqmp->iomem, obj, &grlib_irqmp_ops, irqmp,
	"irqmp", IRQMP_REG_SIZE);

	irqmp->state = g_malloc0(sizeof *irqmp->state);

	sysbus_init_mmio(dev, &irqmp->iomem);
	}

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

	dc->reset = grlib_irqmp_reset;
	}

	static const TypeInfo grlib_irqmp_info = {
	.name = TYPE_GRLIB_IRQMP,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(IRQMP),
	.instance_init = grlib_irqmp_init,
	.class_init = grlib_irqmp_class_init,
	};

	static void grlib_irqmp_register_types(void)
	{
	type_register_static(&grlib_irqmp_info);
	}

	type_init(grlib_irqmp_register_types)