/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
* Authors: Sanjay Lal <sanjayl@kymasys.com>
*
* Copyright (C) 2016 Imagination Technologies
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "exec/memory.h"
#include "sysemu/kvm.h"
#include "sysemu/reset.h"
#include "kvm_mips.h"
#include "hw/intc/mips_gic.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
static void mips_gic_set_vp_irq(MIPSGICState *gic, int vp, int pin)
{
int ored_level = 0;
int i;
/* ORing pending registers sharing same pin */
for (i = 0; i < gic->num_irq; i++) {
if ((gic->irq_state[i].map_pin & GIC_MAP_MSK) == pin &&
gic->irq_state[i].map_vp == vp &&
gic->irq_state[i].enabled) {
ored_level |= gic->irq_state[i].pending;
}
if (ored_level) {
/* no need to iterate all interrupts */
break;
}
}
if (((gic->vps[vp].compare_map & GIC_MAP_MSK) == pin) &&
(gic->vps[vp].mask & GIC_VP_MASK_CMP_MSK)) {
/* ORing with local pending register (count/compare) */
ored_level |= (gic->vps[vp].pend & GIC_VP_MASK_CMP_MSK) >>
GIC_VP_MASK_CMP_SHF;
}
if (kvm_enabled()) {
kvm_mips_set_ipi_interrupt(env_archcpu(gic->vps[vp].env),
pin + GIC_CPU_PIN_OFFSET,
ored_level);
} else {
qemu_set_irq(gic->vps[vp].env->irq[pin + GIC_CPU_PIN_OFFSET],
ored_level);
}
}
static void gic_update_pin_for_irq(MIPSGICState *gic, int n_IRQ)
{
int vp = gic->irq_state[n_IRQ].map_vp;
int pin = gic->irq_state[n_IRQ].map_pin & GIC_MAP_MSK;
if (vp < 0 || vp >= gic->num_vps) {
return;
}
mips_gic_set_vp_irq(gic, vp, pin);
}
static void gic_set_irq(void *opaque, int n_IRQ, int level)
{
MIPSGICState *gic = (MIPSGICState *) opaque;
gic->irq_state[n_IRQ].pending = (uint8_t) level;
if (!gic->irq_state[n_IRQ].enabled) {
/* GIC interrupt source disabled */
return;
}
gic_update_pin_for_irq(gic, n_IRQ);
}
#define OFFSET_CHECK(c) \
do { \
if (!(c)) { \
goto bad_offset; \
} \
} while (0)
/* GIC Read VP Local/Other Registers */
static uint64_t gic_read_vp(MIPSGICState *gic, uint32_t vp_index, hwaddr addr,
unsigned size)
{
switch (addr) {
case GIC_VP_CTL_OFS:
return gic->vps[vp_index].ctl;
case GIC_VP_PEND_OFS:
mips_gictimer_get_sh_count(gic->gic_timer);
return gic->vps[vp_index].pend;
case GIC_VP_MASK_OFS:
return gic->vps[vp_index].mask;
case GIC_VP_COMPARE_MAP_OFS:
return gic->vps[vp_index].compare_map;
case GIC_VP_OTHER_ADDR_OFS:
return gic->vps[vp_index].other_addr;
case GIC_VP_IDENT_OFS:
return vp_index;
case GIC_VP_COMPARE_LO_OFS:
return mips_gictimer_get_vp_compare(gic->gic_timer, vp_index);
case GIC_VP_COMPARE_HI_OFS:
return 0;
default:
qemu_log_mask(LOG_UNIMP, "Read %d bytes at GIC offset LOCAL/OTHER 0x%"
PRIx64 "\n", size, addr);
break;
}
return 0;
}
static uint64_t gic_read(void *opaque, hwaddr addr, unsigned size)
{
MIPSGICState *gic = (MIPSGICState *) opaque;
uint32_t vp_index = current_cpu->cpu_index;
uint64_t ret = 0;
int i, base, irq_src;
uint32_t other_index;
switch (addr) {
case GIC_SH_CONFIG_OFS:
ret = gic->sh_config | (mips_gictimer_get_countstop(gic->gic_timer) <<
GIC_SH_CONFIG_COUNTSTOP_SHF);
break;
case GIC_SH_COUNTERLO_OFS:
ret = mips_gictimer_get_sh_count(gic->gic_timer);
break;
case GIC_SH_COUNTERHI_OFS:
ret = 0;
break;
case GIC_SH_PEND_OFS ... GIC_SH_PEND_LAST_OFS:
/* each bit represents pending status for an interrupt pin */
base = (addr - GIC_SH_PEND_OFS) * 8;
OFFSET_CHECK((base + size * 8) <= gic->num_irq);
for (i = 0; i < size * 8; i++) {
ret |= (uint64_t) (gic->irq_state[base + i].pending) << i;
}
break;
case GIC_SH_MASK_OFS ... GIC_SH_MASK_LAST_OFS:
/* each bit represents status for an interrupt pin */
base = (addr - GIC_SH_MASK_OFS) * 8;
OFFSET_CHECK((base + size * 8) <= gic->num_irq);
for (i = 0; i < size * 8; i++) {
ret |= (uint64_t) (gic->irq_state[base + i].enabled) << i;
}
break;
case GIC_SH_MAP0_PIN_OFS ... GIC_SH_MAP255_PIN_OFS:
/* 32 bits per a pin */
irq_src = (addr - GIC_SH_MAP0_PIN_OFS) / 4;
OFFSET_CHECK(irq_src < gic->num_irq);
ret = gic->irq_state[irq_src].map_pin;
break;
case GIC_SH_MAP0_VP_OFS ... GIC_SH_MAP255_VP_LAST_OFS:
/* up to 32 bytes per a pin */
irq_src = (addr - GIC_SH_MAP0_VP_OFS) / 32;
OFFSET_CHECK(irq_src < gic->num_irq);
if ((gic->irq_state[irq_src].map_vp) >= 0) {
ret = (uint64_t) 1 << (gic->irq_state[irq_src].map_vp);
} else {
ret = 0;
}
break;
/* VP-Local Register */
case VP_LOCAL_SECTION_OFS ... (VP_LOCAL_SECTION_OFS + GIC_VL_BRK_GROUP):
ret = gic_read_vp(gic, vp_index, addr - VP_LOCAL_SECTION_OFS, size);
break;
/* VP-Other Register */
case VP_OTHER_SECTION_OFS ... (VP_OTHER_SECTION_OFS + GIC_VL_BRK_GROUP):
other_index = gic->vps[vp_index].other_addr;
ret = gic_read_vp(gic, other_index, addr - VP_OTHER_SECTION_OFS, size);
break;
/* User-Mode Visible section */
case USM_VISIBLE_SECTION_OFS + GIC_USER_MODE_COUNTERLO:
ret = mips_gictimer_get_sh_count(gic->gic_timer);
break;
case USM_VISIBLE_SECTION_OFS + GIC_USER_MODE_COUNTERHI:
ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP, "Read %d bytes at GIC offset 0x%" PRIx64 "\n",
size, addr);
break;
}
return ret;
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR, "Wrong GIC offset at 0x%" PRIx64 "\n", addr);
return 0;
}
static void gic_timer_expire_cb(void *opaque, uint32_t vp_index)
{
MIPSGICState *gic = opaque;
gic->vps[vp_index].pend |= (1 << GIC_LOCAL_INT_COMPARE);
if (gic->vps[vp_index].pend &
(gic->vps[vp_index].mask & GIC_VP_MASK_CMP_MSK)) {
if (gic->vps[vp_index].compare_map & GIC_MAP_TO_PIN_MSK) {
/* it is safe to set the irq high regardless of other GIC IRQs */
uint32_t pin = (gic->vps[vp_index].compare_map & GIC_MAP_MSK);
qemu_irq_raise(gic->vps[vp_index].env->irq
[pin + GIC_CPU_PIN_OFFSET]);
}
}
}
static void gic_timer_store_vp_compare(MIPSGICState *gic, uint32_t vp_index,
uint64_t compare)
{
gic->vps[vp_index].pend &= ~(1 << GIC_LOCAL_INT_COMPARE);
if (gic->vps[vp_index].compare_map & GIC_MAP_TO_PIN_MSK) {
uint32_t pin = (gic->vps[vp_index].compare_map & GIC_MAP_MSK);
mips_gic_set_vp_irq(gic, vp_index, pin);
}
mips_gictimer_store_vp_compare(gic->gic_timer, vp_index, compare);
}
/* GIC Write VP Local/Other Registers */
static void gic_write_vp(MIPSGICState *gic, uint32_t vp_index, hwaddr addr,
uint64_t data, unsigned size)
{
switch (addr) {
case GIC_VP_CTL_OFS:
/* EIC isn't supported */
break;
case GIC_VP_RMASK_OFS:
gic->vps[vp_index].mask &= ~(data & GIC_VP_SET_RESET_MSK) &
GIC_VP_SET_RESET_MSK;
break;
case GIC_VP_SMASK_OFS:
gic->vps[vp_index].mask |= data & GIC_VP_SET_RESET_MSK;
break;
case GIC_VP_COMPARE_MAP_OFS:
/* EIC isn't supported */
OFFSET_CHECK((data & GIC_MAP_MSK) <= GIC_CPU_INT_MAX);
gic->vps[vp_index].compare_map = data & GIC_MAP_TO_PIN_REG_MSK;
break;
case GIC_VP_OTHER_ADDR_OFS:
OFFSET_CHECK(data < gic->num_vps);
gic->vps[vp_index].other_addr = data;
break;
case GIC_VP_COMPARE_LO_OFS:
gic_timer_store_vp_compare(gic, vp_index, data);
break;
default:
qemu_log_mask(LOG_UNIMP, "Write %d bytes at GIC offset LOCAL/OTHER "
"0x%" PRIx64" 0x%08" PRIx64 "\n", size, addr, data);
break;
}
return;
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR, "Wrong GIC offset at 0x%" PRIx64 "\n", addr);
return;
}
static void gic_write(void *opaque, hwaddr addr, uint64_t data, unsigned size)
{
int intr;
MIPSGICState *gic = (MIPSGICState *) opaque;
uint32_t vp_index = current_cpu->cpu_index;
int i, base, irq_src;
uint32_t other_index;
switch (addr) {
case GIC_SH_CONFIG_OFS:
{
uint32_t pre_cntstop = mips_gictimer_get_countstop(gic->gic_timer);
uint32_t new_cntstop = (data & GIC_SH_CONFIG_COUNTSTOP_MSK) >>
GIC_SH_CONFIG_COUNTSTOP_SHF;
if (pre_cntstop != new_cntstop) {
if (new_cntstop == 1) {
mips_gictimer_stop_count(gic->gic_timer);
} else {
mips_gictimer_start_count(gic->gic_timer);
}
}
}
break;
case GIC_SH_COUNTERLO_OFS:
if (mips_gictimer_get_countstop(gic->gic_timer)) {
mips_gictimer_store_sh_count(gic->gic_timer, data);
}
break;
case GIC_SH_RMASK_OFS ... GIC_SH_RMASK_LAST_OFS:
/* up to 64 bits per a pin */
base = (addr - GIC_SH_RMASK_OFS) * 8;
OFFSET_CHECK((base + size * 8) <= gic->num_irq);
for (i = 0; i < size * 8; i++) {
gic->irq_state[base + i].enabled &= !((data >> i) & 1);
gic_update_pin_for_irq(gic, base + i);
}
break;
case GIC_SH_WEDGE_OFS:
/* Figure out which VP/HW Interrupt this maps to */
intr = data & ~GIC_SH_WEDGE_RW_MSK;
/* Mask/Enabled Checks */
OFFSET_CHECK(intr < gic->num_irq);
if (data & GIC_SH_WEDGE_RW_MSK) {
gic_set_irq(gic, intr, 1);
} else {
gic_set_irq(gic, intr, 0);
}
break;
case GIC_SH_SMASK_OFS ... GIC_SH_SMASK_LAST_OFS:
/* up to 64 bits per a pin */
base = (addr - GIC_SH_SMASK_OFS) * 8;
OFFSET_CHECK((base + size * 8) <= gic->num_irq);
for (i = 0; i < size * 8; i++) {
gic->irq_state[base + i].enabled |= (data >> i) & 1;
gic_update_pin_for_irq(gic, base + i);
}
break;
case GIC_SH_MAP0_PIN_OFS ... GIC_SH_MAP255_PIN_OFS:
/* 32 bits per a pin */
irq_src = (addr - GIC_SH_MAP0_PIN_OFS) / 4;
OFFSET_CHECK(irq_src < gic->num_irq);
/* EIC isn't supported */
OFFSET_CHECK((data & GIC_MAP_MSK) <= GIC_CPU_INT_MAX);
gic->irq_state[irq_src].map_pin = data & GIC_MAP_TO_PIN_REG_MSK;
break;
case GIC_SH_MAP0_VP_OFS ... GIC_SH_MAP255_VP_LAST_OFS:
/* up to 32 bytes per a pin */
irq_src = (addr - GIC_SH_MAP0_VP_OFS) / 32;
OFFSET_CHECK(irq_src < gic->num_irq);
data = data ? ctz64(data) : -1;
OFFSET_CHECK(data < gic->num_vps);
gic->irq_state[irq_src].map_vp = data;
break;
case VP_LOCAL_SECTION_OFS ... (VP_LOCAL_SECTION_OFS + GIC_VL_BRK_GROUP):
gic_write_vp(gic, vp_index, addr - VP_LOCAL_SECTION_OFS, data, size);
break;
case VP_OTHER_SECTION_OFS ... (VP_OTHER_SECTION_OFS + GIC_VL_BRK_GROUP):
other_index = gic->vps[vp_index].other_addr;
gic_write_vp(gic, other_index, addr - VP_OTHER_SECTION_OFS, data, size);
break;
case USM_VISIBLE_SECTION_OFS + GIC_USER_MODE_COUNTERLO:
case USM_VISIBLE_SECTION_OFS + GIC_USER_MODE_COUNTERHI:
/* do nothing. Read-only section */
break;
default:
qemu_log_mask(LOG_UNIMP, "Write %d bytes at GIC offset 0x%" PRIx64
" 0x%08" PRIx64 "\n", size, addr, data);
break;
}
return;
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR, "Wrong GIC offset at 0x%" PRIx64 "\n", addr);
}
static void gic_reset(void *opaque)
{
int i;
MIPSGICState *gic = (MIPSGICState *) opaque;
int numintrs = (gic->num_irq / 8) - 1;
gic->sh_config = /* COUNTSTOP = 0 it is accessible via MIPSGICTimer*/
/* CounterHi not implemented */
(0 << GIC_SH_CONFIG_COUNTBITS_SHF) |
(numintrs << GIC_SH_CONFIG_NUMINTRS_SHF) |
(gic->num_vps << GIC_SH_CONFIG_PVPS_SHF);
for (i = 0; i < gic->num_vps; i++) {
gic->vps[i].ctl = 0x0;
gic->vps[i].pend = 0x0;
/* PERFCNT, TIMER and WD not implemented */
gic->vps[i].mask = 0x32;
gic->vps[i].compare_map = GIC_MAP_TO_PIN_MSK;
mips_gictimer_store_vp_compare(gic->gic_timer, i, 0xffffffff);
gic->vps[i].other_addr = 0x0;
}
for (i = 0; i < gic->num_irq; i++) {
gic->irq_state[i].enabled = 0;
gic->irq_state[i].pending = 0;
gic->irq_state[i].map_pin = GIC_MAP_TO_PIN_MSK;
gic->irq_state[i].map_vp = -1;
}
mips_gictimer_store_sh_count(gic->gic_timer, 0);
/* COUNTSTOP = 0 */
mips_gictimer_start_count(gic->gic_timer);
}
static const MemoryRegionOps gic_ops = {
.read = gic_read,
.write = gic_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.max_access_size = 8,
},
};
static void mips_gic_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
MIPSGICState *s = MIPS_GIC(obj);
memory_region_init_io(&s->mr, OBJECT(s), &gic_ops, s,
"mips-gic", GIC_ADDRSPACE_SZ);
sysbus_init_mmio(sbd, &s->mr);
qemu_register_reset(gic_reset, s);
}
static void mips_gic_realize(DeviceState *dev, Error **errp)
{
MIPSGICState *s = MIPS_GIC(dev);
CPUState *cs = first_cpu;
int i;
if (s->num_vps > GIC_MAX_VPS) {
error_setg(errp, "Exceeded maximum CPUs %d", s->num_vps);
return;
}
if ((s->num_irq > GIC_MAX_INTRS) || (s->num_irq % 8) || (s->num_irq <= 0)) {
error_setg(errp, "GIC supports up to %d external interrupts in "
"multiples of 8 : %d", GIC_MAX_INTRS, s->num_irq);
return;
}
s->vps = g_new(MIPSGICVPState, s->num_vps);
s->irq_state = g_new(MIPSGICIRQState, s->num_irq);
/* Register the env for all VPs with the GIC */
for (i = 0; i < s->num_vps; i++) {
if (cs != NULL) {
s->vps[i].env = cs->env_ptr;
cs = CPU_NEXT(cs);
} else {
error_setg(errp,
"Unable to initialize GIC, CPUState for CPU#%d not valid.", i);
return;
}
}
s->gic_timer = mips_gictimer_init(s, s->num_vps, gic_timer_expire_cb);
qdev_init_gpio_in(dev, gic_set_irq, s->num_irq);
for (i = 0; i < s->num_irq; i++) {
s->irq_state[i].irq = qdev_get_gpio_in(dev, i);
}
}
static Property mips_gic_properties[] = {
DEFINE_PROP_INT32("num-vp", MIPSGICState, num_vps, 1),
DEFINE_PROP_INT32("num-irq", MIPSGICState, num_irq, 256),
DEFINE_PROP_END_OF_LIST(),
};
static void mips_gic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = mips_gic_properties;
dc->realize = mips_gic_realize;
}
static const TypeInfo mips_gic_info = {
.name = TYPE_MIPS_GIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MIPSGICState),
.instance_init = mips_gic_init,
.class_init = mips_gic_class_init,
};
static void mips_gic_register_types(void)
{
type_register_static(&mips_gic_info);
}
type_init(mips_gic_register_types)
