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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 licenced under the GPL.
*/
#include <assert.h>
#include "sh_intc.h"
#include "hw.h"
#include "sh.h"
//#define DEBUG_INTC
#define INTC_A7(x) ((x) & 0x1fffffff)
#define INTC_ARRAY(x) (sizeof(x) / sizeof(x[0]))
#define INTC_MODE_NONE 0
#define INTC_MODE_DUAL_SET 1
#define INTC_MODE_DUAL_CLR 2
#define INTC_MODE_ENABLE_REG 3
#define INTC_MODE_MASK_REG 4
#define INTC_MODE_IS_PRIO 8
static unsigned int sh_intc_mode(unsigned long address,
unsigned long set_reg, unsigned long clr_reg)
{
if ((address != INTC_A7(set_reg)) &&
(address != INTC_A7(clr_reg)))
return INTC_MODE_NONE;
if (set_reg && clr_reg) {
if (address == INTC_A7(set_reg))
return INTC_MODE_DUAL_SET;
else
return INTC_MODE_DUAL_CLR;
}
if (set_reg)
return INTC_MODE_ENABLE_REG;
else
return 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)
{
unsigned int i, mode;
/* 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)
continue;
*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)
continue;
*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;
}
}
assert(0);
}
static void sh_intc_toggle(struct intc_desc *desc, intc_enum id,
int enable, int is_group)
{
struct intc_source *source = desc->sources + id;
int old = source->enable_count;
if (!id)
return;
if (!source->next_enum_id && (!source->enable_max || !source->vect)) {
#ifdef DEBUG_INTC
printf("sh_intc: reserved interrupt source %d modified\n", id);
#endif
return;
}
if (source->vect) {
if (enable)
source->enable_count++;
else
source->enable_count--;
if (source->enable_count == source->enable_max) {
#ifdef DEBUG_INTC
printf("sh_intc: enabling interrupt source %d -> 0x%04x\n",
id, source->vect);
#endif
}
if (old == source->enable_max) {
#ifdef DEBUG_INTC
printf("sh_intc: disabling interrupt source %d -> 0x%04x\n",
id, source->vect);
#endif
}
}
#ifdef DEBUG_INTC
else {
printf("setting interrupt group %d to %d\n", id, !!enable);
}
#endif
if ((is_group || !source->vect) && source->next_enum_id) {
sh_intc_toggle(desc, source->next_enum_id, enable, 1);
}
#ifdef DEBUG_INTC
if (!source->vect) {
printf("setting interrupt group %d to %d - done\n", id, !!enable);
}
#endif
}
static uint32_t sh_intc_read(void *opaque, target_phys_addr_t offset)
{
struct intc_desc *desc = opaque;
intc_enum *enum_ids = NULL;
unsigned int first = 0;
unsigned int width = 0;
unsigned int mode = 0;
unsigned long *valuep;
#ifdef DEBUG_INTC
printf("sh_intc_read 0x%lx\n", (unsigned long) offset);
#endif
sh_intc_locate(desc, (unsigned long)offset, &valuep,
&enum_ids, &first, &width, &mode);
return *valuep;
}
static void sh_intc_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
struct intc_desc *desc = opaque;
intc_enum *enum_ids = NULL;
unsigned int first = 0;
unsigned int width = 0;
unsigned int mode = 0;
unsigned int k;
unsigned long *valuep;
unsigned long mask;
#ifdef DEBUG_INTC
printf("sh_intc_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
#endif
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: assert(0);
}
for (k = 0; k <= first; k++) {
mask = ((1 << width) - 1) << ((first - k) * width);
if ((*valuep & mask) == (value & mask))
continue;
#if 0
printf("k = %d, first = %d, enum = %d, mask = 0x%08x\n",
k, first, enum_ids[k], (unsigned int)mask);
#endif
sh_intc_toggle(desc, enum_ids[k], value & mask, 0);
}
*valuep = value;
#ifdef DEBUG_INTC
printf("sh_intc_write 0x%lx -> 0x%08x\n", (unsigned long) offset, value);
#endif
}
static CPUReadMemoryFunc *sh_intc_readfn[] = {
sh_intc_read,
sh_intc_read,
sh_intc_read
};
static CPUWriteMemoryFunc *sh_intc_writefn[] = {
sh_intc_write,
sh_intc_write,
sh_intc_write
};
struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id)
{
if (id)
return desc->sources + id;
return NULL;
}
static void sh_intc_register(struct intc_desc *desc,
unsigned long address)
{
if (address)
cpu_register_physical_memory(INTC_A7(address), 4, desc->iomemtype);
}
static void sh_intc_register_source(struct intc_desc *desc,
intc_enum source,
struct intc_group *groups,
int nr_groups)
{
unsigned int i, k;
struct intc_source *s;
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 < INTC_ARRAY(mr->enum_ids); k++) {
if (mr->enum_ids[k] != source)
continue;
s = sh_intc_source(desc, mr->enum_ids[k]);
if (s)
s->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 < INTC_ARRAY(pr->enum_ids); k++) {
if (pr->enum_ids[k] != source)
continue;
s = sh_intc_source(desc, pr->enum_ids[k]);
if (s)
s->enable_max++;
}
}
}
if (groups) {
for (i = 0; i < nr_groups; i++) {
struct intc_group *gr = groups + i;
for (k = 0; k < INTC_ARRAY(gr->enum_ids); k++) {
if (gr->enum_ids[k] != source)
continue;
s = sh_intc_source(desc, gr->enum_ids[k]);
if (s)
s->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;
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);
s = sh_intc_source(desc, vect->enum_id);
if (s)
s->vect = vect->vect;
#ifdef DEBUG_INTC
printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n",
vect->enum_id, s->vect, s->enable_count, s->enable_max);
#endif
}
if (groups) {
for (i = 0; i < nr_groups; i++) {
struct intc_group *gr = groups + i;
s = sh_intc_source(desc, gr->enum_id);
s->next_enum_id = gr->enum_ids[0];
for (k = 1; k < INTC_ARRAY(gr->enum_ids); k++) {
if (!gr->enum_ids[k])
continue;
s = sh_intc_source(desc, gr->enum_ids[k - 1]);
s->next_enum_id = gr->enum_ids[k];
}
#ifdef DEBUG_INTC
printf("sh_intc: registered group %d (%d/%d)\n",
gr->enum_id, s->enable_count, s->enable_max);
#endif
}
}
}
int sh_intc_init(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;
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;
i = sizeof(struct intc_source) * nr_sources;
desc->sources = malloc(i);
if (!desc->sources)
return -1;
memset(desc->sources, 0, i);
desc->iomemtype = cpu_register_io_memory(0, sh_intc_readfn,
sh_intc_writefn, desc);
if (desc->mask_regs) {
for (i = 0; i < desc->nr_mask_regs; i++) {
struct intc_mask_reg *mr = desc->mask_regs + i;
sh_intc_register(desc, mr->set_reg);
sh_intc_register(desc, mr->clr_reg);
}
}
if (desc->prio_regs) {
for (i = 0; i < desc->nr_prio_regs; i++) {
struct intc_prio_reg *pr = desc->prio_regs + i;
sh_intc_register(desc, pr->set_reg);
sh_intc_register(desc, pr->clr_reg);
}
}
return 0;
}
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