diff options
Diffstat (limited to 'hw/sh_intc.c')
| -rw-r--r-- | hw/sh_intc.c | 123 |
1 files changed, 96 insertions, 27 deletions
diff --git a/hw/sh_intc.c b/hw/sh_intc.c index 647f1cba9..8d1674ae3 100644 --- a/hw/sh_intc.c +++ b/hw/sh_intc.c @@ -14,10 +14,91 @@ #include "sh.h" //#define DEBUG_INTC +//#define DEBUG_INTC_SOURCES #define INTC_A7(x) ((x) & 0x1fffffff) #define INTC_ARRAY(x) (sizeof(x) / sizeof(x[0])) +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) { +#ifdef DEBUG_INTC_SOURCES + printf("sh_intc: (%d/%d/%d/%d) interrupt source 0x%x %s%s%s\n", + 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" : ""); +#endif + } +} + +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) { +#ifdef DEBUG_INTC_SOURCES + printf("sh_intc: (%d) returning interrupt source 0x%x\n", + desc->pending, source->vect); +#endif + return source->vect; + } + } + + assert(0); +} + #define INTC_MODE_NONE 0 #define INTC_MODE_DUAL_SET 1 #define INTC_MODE_DUAL_CLR 2 @@ -94,42 +175,24 @@ static void sh_intc_locate(struct intc_desc *desc, assert(0); } -static void sh_intc_toggle(struct intc_desc *desc, intc_enum id, - int enable, int is_group) +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; - int old = source->enable_count; if (!id) return; if (!source->next_enum_id && (!source->enable_max || !source->vect)) { -#ifdef DEBUG_INTC +#ifdef DEBUG_INTC_SOURCES 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->vect) + sh_intc_toggle_source(source, enable ? 1 : -1, 0); - 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); @@ -137,7 +200,7 @@ static void sh_intc_toggle(struct intc_desc *desc, intc_enum id, #endif if ((is_group || !source->vect) && source->next_enum_id) { - sh_intc_toggle(desc, source->next_enum_id, enable, 1); + sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1); } #ifdef DEBUG_INTC @@ -200,7 +263,7 @@ static void sh_intc_write(void *opaque, target_phys_addr_t offset, 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); + sh_intc_toggle_mask(desc, enum_ids[k], value & mask, 0); } *valuep = value; @@ -309,7 +372,7 @@ void sh_intc_register_sources(struct intc_desc *desc, if (s) s->vect = vect->vect; -#ifdef DEBUG_INTC +#ifdef DEBUG_INTC_SOURCES printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n", vect->enum_id, s->vect, s->enable_count, s->enable_max); #endif @@ -330,7 +393,7 @@ void sh_intc_register_sources(struct intc_desc *desc, s->next_enum_id = gr->enum_ids[k]; } -#ifdef DEBUG_INTC +#ifdef DEBUG_INTC_SOURCES printf("sh_intc: registered group %d (%d/%d)\n", gr->enum_id, s->enable_count, s->enable_max); #endif @@ -347,6 +410,7 @@ int sh_intc_init(struct intc_desc *desc, { unsigned int i; + desc->pending = 0; desc->nr_sources = nr_sources; desc->mask_regs = mask_regs; desc->nr_mask_regs = nr_mask_regs; @@ -359,6 +423,11 @@ int sh_intc_init(struct intc_desc *desc, return -1; memset(desc->sources, 0, i); + for (i = 0; i < desc->nr_sources; i++) { + struct intc_source *source = desc->sources + i; + + source->parent = desc; + } desc->iomemtype = cpu_register_io_memory(0, sh_intc_readfn, sh_intc_writefn, desc); |