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xemu/hw/intc/sh_intc.c
BALATON Zoltan 3233178789 hw/intc/sh_intc: Remove unneeded local variable initialisers 
The sh_intc_locate function will either init these or not return so no
need to initialise them.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <15e04aa665c68ab5df47bbf505346d413be2fc1c.1635541329.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2021-10-30 18:39:37 +02:00

450 lines
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/*
* SuperH interrupt controller module
*
* Copyright (c) 2007 Magnus Damm
* Based on sh_timer.c and arm_timer.c by Paul Brook
* Copyright (c) 2005-2006 CodeSourcery.
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "hw/sh4/sh_intc.h"
#include "hw/irq.h"
#include "hw/sh4/sh.h"
#include "trace.h"
void sh_intc_toggle_source(struct intc_source *source,
int enable_adj, int assert_adj)
{
int enable_changed = 0;
int pending_changed = 0;
int old_pending;
if (source->enable_count == source->enable_max && enable_adj == -1) {
enable_changed = -1;
}
source->enable_count += enable_adj;
if (source->enable_count == source->enable_max) {
enable_changed = 1;
}
source->asserted += assert_adj;
old_pending = source->pending;
source->pending = source->asserted &&
(source->enable_count == source->enable_max);
if (old_pending != source->pending) {
pending_changed = 1;
}
if (pending_changed) {
if (source->pending) {
source->parent->pending++;
if (source->parent->pending == 1) {
cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD);
}
} else {
source->parent->pending--;
if (source->parent->pending == 0) {
cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD);
}
}
}
if (enable_changed || assert_adj || pending_changed) {
trace_sh_intc_sources(source->parent->pending, source->asserted,
source->enable_count, source->enable_max,
source->vect, source->asserted ? "asserted " :
assert_adj ? "deasserted" : "",
enable_changed == 1 ? "enabled " :
enable_changed == -1 ? "disabled " : "",
source->pending ? "pending" : "");
}
}
static void sh_intc_set_irq(void *opaque, int n, int level)
{
struct intc_desc *desc = opaque;
struct intc_source *source = &desc->sources[n];
if (level && !source->asserted) {
sh_intc_toggle_source(source, 0, 1);
} else if (!level && source->asserted) {
sh_intc_toggle_source(source, 0, -1);
}
}
int sh_intc_get_pending_vector(struct intc_desc *desc, int imask)
{
unsigned int i;
/* slow: use a linked lists of pending sources instead */
/* wrong: take interrupt priority into account (one list per priority) */
if (imask == 0x0f) {
return -1; /* FIXME, update code to include priority per source */
}
for (i = 0; i < desc->nr_sources; i++) {
struct intc_source *source = &desc->sources[i];
if (source->pending) {
trace_sh_intc_pending(desc->pending, source->vect);
return source->vect;
}
}
g_assert_not_reached();
}
typedef enum {
INTC_MODE_NONE,
INTC_MODE_DUAL_SET,
INTC_MODE_DUAL_CLR,
INTC_MODE_ENABLE_REG,
INTC_MODE_MASK_REG,
} SHIntCMode;
#define INTC_MODE_IS_PRIO 0x80
static SHIntCMode sh_intc_mode(unsigned long address, unsigned long set_reg,
unsigned long clr_reg)
{
if (address != A7ADDR(set_reg) && address != A7ADDR(clr_reg)) {
return INTC_MODE_NONE;
}
if (set_reg && clr_reg) {
return address == A7ADDR(set_reg) ?
INTC_MODE_DUAL_SET : INTC_MODE_DUAL_CLR;
}
return set_reg ? INTC_MODE_ENABLE_REG : INTC_MODE_MASK_REG;
}
static void sh_intc_locate(struct intc_desc *desc,
unsigned long address,
unsigned long **datap,
intc_enum **enums,
unsigned int *first,
unsigned int *width,
unsigned int *modep)
{
SHIntCMode mode;
unsigned int i;
/* this is slow but works for now */
if (desc->mask_regs) {
for (i = 0; i < desc->nr_mask_regs; i++) {
struct intc_mask_reg *mr = &desc->mask_regs[i];
mode = sh_intc_mode(address, mr->set_reg, mr->clr_reg);
if (mode != INTC_MODE_NONE) {
*modep = mode;
*datap = &mr->value;
*enums = mr->enum_ids;
*first = mr->reg_width - 1;
*width = 1;
return;
}
}
}
if (desc->prio_regs) {
for (i = 0; i < desc->nr_prio_regs; i++) {
struct intc_prio_reg *pr = &desc->prio_regs[i];
mode = sh_intc_mode(address, pr->set_reg, pr->clr_reg);
if (mode != INTC_MODE_NONE) {
*modep = mode | INTC_MODE_IS_PRIO;
*datap = &pr->value;
*enums = pr->enum_ids;
*first = pr->reg_width / pr->field_width - 1;
*width = pr->field_width;
return;
}
}
}
g_assert_not_reached();
}
static void sh_intc_toggle_mask(struct intc_desc *desc, intc_enum id,
int enable, int is_group)
{
struct intc_source *source = &desc->sources[id];
if (!id) {
return;
}
if (!source->next_enum_id && (!source->enable_max || !source->vect)) {
qemu_log_mask(LOG_UNIMP,
"sh_intc: reserved interrupt source %d modified\n", id);
return;
}
if (source->vect) {
sh_intc_toggle_source(source, enable ? 1 : -1, 0);
}
if ((is_group || !source->vect) && source->next_enum_id) {
sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1);
}
if (!source->vect) {
trace_sh_intc_set(id, !!enable);
}
}
static uint64_t sh_intc_read(void *opaque, hwaddr offset, unsigned size)
{
struct intc_desc *desc = opaque;
intc_enum *enum_ids;
unsigned int first;
unsigned int width;
unsigned int mode;
unsigned long *valuep;
sh_intc_locate(desc, (unsigned long)offset, &valuep,
&enum_ids, &first, &width, &mode);
trace_sh_intc_read(size, (uint64_t)offset, *valuep);
return *valuep;
}
static void sh_intc_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
struct intc_desc *desc = opaque;
intc_enum *enum_ids;
unsigned int first;
unsigned int width;
unsigned int mode;
unsigned long *valuep;
unsigned int k;
unsigned long mask;
trace_sh_intc_write(size, (uint64_t)offset, value);
sh_intc_locate(desc, (unsigned long)offset, &valuep,
&enum_ids, &first, &width, &mode);
switch (mode) {
case INTC_MODE_ENABLE_REG | INTC_MODE_IS_PRIO:
break;
case INTC_MODE_DUAL_SET:
value |= *valuep;
break;
case INTC_MODE_DUAL_CLR:
value = *valuep & ~value;
break;
default:
g_assert_not_reached();
}
for (k = 0; k <= first; k++) {
mask = (1 << width) - 1;
mask <<= (first - k) * width;
if ((*valuep & mask) != (value & mask)) {
sh_intc_toggle_mask(desc, enum_ids[k], value & mask, 0);
}
}
*valuep = value;
}
static const MemoryRegionOps sh_intc_ops = {
.read = sh_intc_read,
.write = sh_intc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void sh_intc_register_source(struct intc_desc *desc,
intc_enum source,
struct intc_group *groups,
int nr_groups)
{
unsigned int i, k;
intc_enum id;
if (desc->mask_regs) {
for (i = 0; i < desc->nr_mask_regs; i++) {
struct intc_mask_reg *mr = &desc->mask_regs[i];
for (k = 0; k < ARRAY_SIZE(mr->enum_ids); k++) {
id = mr->enum_ids[k];
if (id && id == source) {
desc->sources[id].enable_max++;
}
}
}
}
if (desc->prio_regs) {
for (i = 0; i < desc->nr_prio_regs; i++) {
struct intc_prio_reg *pr = &desc->prio_regs[i];
for (k = 0; k < ARRAY_SIZE(pr->enum_ids); k++) {
id = pr->enum_ids[k];
if (id && id == source) {
desc->sources[id].enable_max++;
}
}
}
}
if (groups) {
for (i = 0; i < nr_groups; i++) {
struct intc_group *gr = &groups[i];
for (k = 0; k < ARRAY_SIZE(gr->enum_ids); k++) {
id = gr->enum_ids[k];
if (id && id == source) {
desc->sources[id].enable_max++;
}
}
}
}
}
void sh_intc_register_sources(struct intc_desc *desc,
struct intc_vect *vectors,
int nr_vectors,
struct intc_group *groups,
int nr_groups)
{
unsigned int i, k;
intc_enum id;
struct intc_source *s;
for (i = 0; i < nr_vectors; i++) {
struct intc_vect *vect = &vectors[i];
sh_intc_register_source(desc, vect->enum_id, groups, nr_groups);
id = vect->enum_id;
if (id) {
s = &desc->sources[id];
s->vect = vect->vect;
trace_sh_intc_register("source", vect->enum_id, s->vect,
s->enable_count, s->enable_max);
}
}
if (groups) {
for (i = 0; i < nr_groups; i++) {
struct intc_group *gr = &groups[i];
id = gr->enum_id;
s = &desc->sources[id];
s->next_enum_id = gr->enum_ids[0];
for (k = 1; k < ARRAY_SIZE(gr->enum_ids); k++) {
if (gr->enum_ids[k]) {
id = gr->enum_ids[k - 1];
s = &desc->sources[id];
s->next_enum_id = gr->enum_ids[k];
}
}
trace_sh_intc_register("group", gr->enum_id, 0xffff,
s->enable_count, s->enable_max);
}
}
}
static unsigned int sh_intc_register(MemoryRegion *sysmem,
struct intc_desc *desc,
const unsigned long address,
const char *type,
const char *action,
const unsigned int index)
{
char name[60];
MemoryRegion *iomem, *iomem_p4, *iomem_a7;
if (!address) {
return 0;
}
iomem = &desc->iomem;
iomem_p4 = &desc->iomem_aliases[index];
iomem_a7 = iomem_p4 + 1;
snprintf(name, sizeof(name), "intc-%s-%s-%s", type, action, "p4");
memory_region_init_alias(iomem_p4, NULL, name, iomem, A7ADDR(address), 4);
memory_region_add_subregion(sysmem, P4ADDR(address), iomem_p4);
snprintf(name, sizeof(name), "intc-%s-%s-%s", type, action, "a7");
memory_region_init_alias(iomem_a7, NULL, name, iomem, A7ADDR(address), 4);
memory_region_add_subregion(sysmem, A7ADDR(address), iomem_a7);
/* used to increment aliases index */
return 2;
}
int sh_intc_init(MemoryRegion *sysmem,
struct intc_desc *desc,
int nr_sources,
struct intc_mask_reg *mask_regs,
int nr_mask_regs,
struct intc_prio_reg *prio_regs,
int nr_prio_regs)
{
unsigned int i, j;
desc->pending = 0;
desc->nr_sources = nr_sources;
desc->mask_regs = mask_regs;
desc->nr_mask_regs = nr_mask_regs;
desc->prio_regs = prio_regs;
desc->nr_prio_regs = nr_prio_regs;
/* Allocate 4 MemoryRegions per register (2 actions * 2 aliases) */
desc->iomem_aliases = g_new0(MemoryRegion,
(nr_mask_regs + nr_prio_regs) * 4);
desc->sources = g_new0(struct intc_source, nr_sources);
for (i = 0; i < nr_sources; i++) {
desc->sources[i].parent = desc;
}
desc->irqs = qemu_allocate_irqs(sh_intc_set_irq, desc, nr_sources);
memory_region_init_io(&desc->iomem, NULL, &sh_intc_ops, desc, "intc",
0x100000000ULL);
j = 0;
if (desc->mask_regs) {
for (i = 0; i < desc->nr_mask_regs; i++) {
struct intc_mask_reg *mr = &desc->mask_regs[i];
j += sh_intc_register(sysmem, desc, mr->set_reg, "mask", "set", j);
j += sh_intc_register(sysmem, desc, mr->clr_reg, "mask", "clr", j);
}
}
if (desc->prio_regs) {
for (i = 0; i < desc->nr_prio_regs; i++) {
struct intc_prio_reg *pr = &desc->prio_regs[i];
j += sh_intc_register(sysmem, desc, pr->set_reg, "prio", "set", j);
j += sh_intc_register(sysmem, desc, pr->clr_reg, "prio", "clr", j);
}
}
return 0;
}
/*
* Assert level <n> IRL interrupt.
* 0:deassert. 1:lowest priority,... 15:highest priority
*/
void sh_intc_set_irl(void *opaque, int n, int level)
{
struct intc_source *s = opaque;
int i, irl = level ^ 15;
intc_enum id = s->next_enum_id;
for (i = 0; id; id = s->next_enum_id, i++) {
s = &s->parent->sources[id];
if (i == irl) {
sh_intc_toggle_source(s, s->enable_count ? 0 : 1,
s->asserted ? 0 : 1);
} else if (s->asserted) {
sh_intc_toggle_source(s, 0, -1);
}
}
}
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