root / hw / sh_intc.c @ 26ca8c06
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/*
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* SuperH interrupt controller module
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*
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* Copyright (c) 2007 Magnus Damm
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* Based on sh_timer.c and arm_timer.c by Paul Brook
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* Copyright (c) 2005-2006 CodeSourcery.
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*
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* This code is licensed under the GPL.
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*/
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#include "sh_intc.h" |
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#include "hw.h" |
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#include "sh.h" |
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//#define DEBUG_INTC
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//#define DEBUG_INTC_SOURCES
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#define INTC_A7(x) ((x) & 0x1fffffff) |
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void sh_intc_toggle_source(struct intc_source *source, |
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int enable_adj, int assert_adj) |
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{ |
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int enable_changed = 0; |
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int pending_changed = 0; |
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int old_pending;
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if ((source->enable_count == source->enable_max) && (enable_adj == -1)) |
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enable_changed = -1;
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source->enable_count += enable_adj; |
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if (source->enable_count == source->enable_max)
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enable_changed = 1;
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source->asserted += assert_adj; |
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old_pending = source->pending; |
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source->pending = source->asserted && |
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(source->enable_count == source->enable_max); |
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if (old_pending != source->pending)
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pending_changed = 1;
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if (pending_changed) {
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if (source->pending) {
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source->parent->pending++; |
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if (source->parent->pending == 1) |
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cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD); |
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} |
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else {
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source->parent->pending--; |
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if (source->parent->pending == 0) |
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cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD); |
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} |
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} |
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if (enable_changed || assert_adj || pending_changed) {
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#ifdef DEBUG_INTC_SOURCES
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printf("sh_intc: (%d/%d/%d/%d) interrupt source 0x%x %s%s%s\n",
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source->parent->pending, |
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source->asserted, |
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source->enable_count, |
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source->enable_max, |
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source->vect, |
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source->asserted ? "asserted " :
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assert_adj ? "deasserted" : "", |
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enable_changed == 1 ? "enabled " : |
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enable_changed == -1 ? "disabled " : "", |
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source->pending ? "pending" : ""); |
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#endif
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} |
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} |
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static void sh_intc_set_irq (void *opaque, int n, int level) |
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{ |
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struct intc_desc *desc = opaque;
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struct intc_source *source = &(desc->sources[n]);
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if (level && !source->asserted)
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sh_intc_toggle_source(source, 0, 1); |
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else if (!level && source->asserted) |
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sh_intc_toggle_source(source, 0, -1); |
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} |
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int sh_intc_get_pending_vector(struct intc_desc *desc, int imask) |
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{ |
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unsigned int i; |
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/* slow: use a linked lists of pending sources instead */
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/* wrong: take interrupt priority into account (one list per priority) */
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if (imask == 0x0f) { |
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return -1; /* FIXME, update code to include priority per source */ |
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} |
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for (i = 0; i < desc->nr_sources; i++) { |
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struct intc_source *source = desc->sources + i;
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if (source->pending) {
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#ifdef DEBUG_INTC_SOURCES
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printf("sh_intc: (%d) returning interrupt source 0x%x\n",
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desc->pending, source->vect); |
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#endif
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return source->vect;
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} |
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} |
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abort(); |
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} |
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#define INTC_MODE_NONE 0 |
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#define INTC_MODE_DUAL_SET 1 |
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#define INTC_MODE_DUAL_CLR 2 |
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#define INTC_MODE_ENABLE_REG 3 |
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#define INTC_MODE_MASK_REG 4 |
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#define INTC_MODE_IS_PRIO 8 |
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static unsigned int sh_intc_mode(unsigned long address, |
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unsigned long set_reg, unsigned long clr_reg) |
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{ |
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if ((address != INTC_A7(set_reg)) &&
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(address != INTC_A7(clr_reg))) |
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return INTC_MODE_NONE;
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if (set_reg && clr_reg) {
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if (address == INTC_A7(set_reg))
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return INTC_MODE_DUAL_SET;
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else
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return INTC_MODE_DUAL_CLR;
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} |
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if (set_reg)
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return INTC_MODE_ENABLE_REG;
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else
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return INTC_MODE_MASK_REG;
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} |
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static void sh_intc_locate(struct intc_desc *desc, |
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unsigned long address, |
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unsigned long **datap, |
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intc_enum **enums, |
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unsigned int *first, |
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unsigned int *width, |
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unsigned int *modep) |
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{ |
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unsigned int i, mode; |
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/* this is slow but works for now */
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if (desc->mask_regs) {
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for (i = 0; i < desc->nr_mask_regs; i++) { |
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struct intc_mask_reg *mr = desc->mask_regs + i;
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mode = sh_intc_mode(address, mr->set_reg, mr->clr_reg); |
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if (mode == INTC_MODE_NONE)
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continue;
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*modep = mode; |
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*datap = &mr->value; |
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*enums = mr->enum_ids; |
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*first = mr->reg_width - 1;
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*width = 1;
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return;
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} |
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} |
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if (desc->prio_regs) {
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for (i = 0; i < desc->nr_prio_regs; i++) { |
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struct intc_prio_reg *pr = desc->prio_regs + i;
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mode = sh_intc_mode(address, pr->set_reg, pr->clr_reg); |
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if (mode == INTC_MODE_NONE)
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continue;
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*modep = mode | INTC_MODE_IS_PRIO; |
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*datap = &pr->value; |
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*enums = pr->enum_ids; |
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*first = (pr->reg_width / pr->field_width) - 1;
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*width = pr->field_width; |
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return;
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} |
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} |
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abort(); |
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} |
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static void sh_intc_toggle_mask(struct intc_desc *desc, intc_enum id, |
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int enable, int is_group) |
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{ |
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struct intc_source *source = desc->sources + id;
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if (!id)
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return;
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if (!source->next_enum_id && (!source->enable_max || !source->vect)) {
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#ifdef DEBUG_INTC_SOURCES
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printf("sh_intc: reserved interrupt source %d modified\n", id);
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#endif
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return;
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} |
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if (source->vect)
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sh_intc_toggle_source(source, enable ? 1 : -1, 0); |
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#ifdef DEBUG_INTC
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else {
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printf("setting interrupt group %d to %d\n", id, !!enable);
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} |
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#endif
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if ((is_group || !source->vect) && source->next_enum_id) {
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sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1);
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} |
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#ifdef DEBUG_INTC
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if (!source->vect) {
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printf("setting interrupt group %d to %d - done\n", id, !!enable);
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} |
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#endif
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} |
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static uint64_t sh_intc_read(void *opaque, hwaddr offset, |
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unsigned size)
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{ |
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struct intc_desc *desc = opaque;
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intc_enum *enum_ids = NULL;
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unsigned int first = 0; |
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unsigned int width = 0; |
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unsigned int mode = 0; |
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unsigned long *valuep; |
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#ifdef DEBUG_INTC
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printf("sh_intc_read 0x%lx\n", (unsigned long) offset); |
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#endif
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sh_intc_locate(desc, (unsigned long)offset, &valuep, |
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&enum_ids, &first, &width, &mode); |
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return *valuep;
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} |
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static void sh_intc_write(void *opaque, hwaddr offset, |
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uint64_t value, unsigned size)
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{ |
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struct intc_desc *desc = opaque;
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intc_enum *enum_ids = NULL;
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unsigned int first = 0; |
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unsigned int width = 0; |
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unsigned int mode = 0; |
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unsigned int k; |
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unsigned long *valuep; |
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unsigned long mask; |
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#ifdef DEBUG_INTC
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printf("sh_intc_write 0x%lx 0x%08x\n", (unsigned long) offset, value); |
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#endif
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sh_intc_locate(desc, (unsigned long)offset, &valuep, |
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&enum_ids, &first, &width, &mode); |
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switch (mode) {
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case INTC_MODE_ENABLE_REG | INTC_MODE_IS_PRIO: break; |
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case INTC_MODE_DUAL_SET: value |= *valuep; break; |
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case INTC_MODE_DUAL_CLR: value = *valuep & ~value; break; |
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default: abort();
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} |
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for (k = 0; k <= first; k++) { |
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mask = ((1 << width) - 1) << ((first - k) * width); |
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if ((*valuep & mask) == (value & mask))
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continue;
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#if 0
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printf("k = %d, first = %d, enum = %d, mask = 0x%08x\n",
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k, first, enum_ids[k], (unsigned int)mask);
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#endif
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sh_intc_toggle_mask(desc, enum_ids[k], value & mask, 0);
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} |
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*valuep = value; |
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#ifdef DEBUG_INTC
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printf("sh_intc_write 0x%lx -> 0x%08x\n", (unsigned long) offset, value); |
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#endif
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} |
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static const MemoryRegionOps sh_intc_ops = { |
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.read = sh_intc_read, |
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.write = sh_intc_write, |
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.endianness = DEVICE_NATIVE_ENDIAN, |
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}; |
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struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id) |
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{ |
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if (id)
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return desc->sources + id;
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return NULL; |
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} |
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static unsigned int sh_intc_register(MemoryRegion *sysmem, |
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struct intc_desc *desc,
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const unsigned long address, |
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const char *type, |
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const char *action, |
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const unsigned int index) |
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{ |
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char name[60]; |
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MemoryRegion *iomem, *iomem_p4, *iomem_a7; |
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if (!address) {
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return 0; |
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} |
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iomem = &desc->iomem; |
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iomem_p4 = desc->iomem_aliases + index; |
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iomem_a7 = iomem_p4 + 1;
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#define SH_INTC_IOMEM_FORMAT "interrupt-controller-%s-%s-%s" |
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snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "p4"); |
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memory_region_init_alias(iomem_p4, name, iomem, INTC_A7(address), 4);
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memory_region_add_subregion(sysmem, P4ADDR(address), iomem_p4); |
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snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "a7"); |
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memory_region_init_alias(iomem_a7, name, iomem, INTC_A7(address), 4);
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memory_region_add_subregion(sysmem, A7ADDR(address), iomem_a7); |
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#undef SH_INTC_IOMEM_FORMAT
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/* used to increment aliases index */
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return 2; |
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} |
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static void sh_intc_register_source(struct intc_desc *desc, |
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intc_enum source, |
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struct intc_group *groups,
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int nr_groups)
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{ |
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unsigned int i, k; |
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struct intc_source *s;
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if (desc->mask_regs) {
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for (i = 0; i < desc->nr_mask_regs; i++) { |
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struct intc_mask_reg *mr = desc->mask_regs + i;
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for (k = 0; k < ARRAY_SIZE(mr->enum_ids); k++) { |
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if (mr->enum_ids[k] != source)
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continue;
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s = sh_intc_source(desc, mr->enum_ids[k]); |
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if (s)
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s->enable_max++; |
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} |
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} |
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} |
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if (desc->prio_regs) {
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for (i = 0; i < desc->nr_prio_regs; i++) { |
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struct intc_prio_reg *pr = desc->prio_regs + i;
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for (k = 0; k < ARRAY_SIZE(pr->enum_ids); k++) { |
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if (pr->enum_ids[k] != source)
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continue;
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s = sh_intc_source(desc, pr->enum_ids[k]); |
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if (s)
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s->enable_max++; |
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} |
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} |
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} |
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if (groups) {
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for (i = 0; i < nr_groups; i++) { |
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struct intc_group *gr = groups + i;
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for (k = 0; k < ARRAY_SIZE(gr->enum_ids); k++) { |
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if (gr->enum_ids[k] != source)
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continue;
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s = sh_intc_source(desc, gr->enum_ids[k]); |
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if (s)
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s->enable_max++; |
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} |
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} |
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} |
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|
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} |
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|
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void sh_intc_register_sources(struct intc_desc *desc, |
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struct intc_vect *vectors,
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int nr_vectors,
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struct intc_group *groups,
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int nr_groups)
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{ |
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unsigned int i, k; |
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struct intc_source *s;
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for (i = 0; i < nr_vectors; i++) { |
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struct intc_vect *vect = vectors + i;
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sh_intc_register_source(desc, vect->enum_id, groups, nr_groups); |
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s = sh_intc_source(desc, vect->enum_id); |
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if (s) {
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s->vect = vect->vect; |
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#ifdef DEBUG_INTC_SOURCES
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printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n",
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vect->enum_id, s->vect, s->enable_count, s->enable_max); |
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#endif
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} |
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} |
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|
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if (groups) {
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for (i = 0; i < nr_groups; i++) { |
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struct intc_group *gr = groups + i;
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s = sh_intc_source(desc, gr->enum_id); |
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s->next_enum_id = gr->enum_ids[0];
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|
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for (k = 1; k < ARRAY_SIZE(gr->enum_ids); k++) { |
419 |
if (!gr->enum_ids[k])
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continue;
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|
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s = sh_intc_source(desc, gr->enum_ids[k - 1]);
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s->next_enum_id = gr->enum_ids[k]; |
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} |
425 |
|
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#ifdef DEBUG_INTC_SOURCES
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printf("sh_intc: registered group %d (%d/%d)\n",
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gr->enum_id, s->enable_count, s->enable_max); |
429 |
#endif
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} |
431 |
} |
432 |
} |
433 |
|
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int sh_intc_init(MemoryRegion *sysmem,
|
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struct intc_desc *desc,
|
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int nr_sources,
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struct intc_mask_reg *mask_regs,
|
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int nr_mask_regs,
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struct intc_prio_reg *prio_regs,
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int nr_prio_regs)
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{ |
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unsigned int i, j; |
443 |
|
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desc->pending = 0;
|
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desc->nr_sources = nr_sources; |
446 |
desc->mask_regs = mask_regs; |
447 |
desc->nr_mask_regs = nr_mask_regs; |
448 |
desc->prio_regs = prio_regs; |
449 |
desc->nr_prio_regs = nr_prio_regs; |
450 |
/* Allocate 4 MemoryRegions per register (2 actions * 2 aliases).
|
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**/
|
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desc->iomem_aliases = g_new0(MemoryRegion, |
453 |
(nr_mask_regs + nr_prio_regs) * 4);
|
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|
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j = 0;
|
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i = sizeof(struct intc_source) * nr_sources; |
457 |
desc->sources = g_malloc0(i); |
458 |
|
459 |
for (i = 0; i < desc->nr_sources; i++) { |
460 |
struct intc_source *source = desc->sources + i;
|
461 |
|
462 |
source->parent = desc; |
463 |
} |
464 |
|
465 |
desc->irqs = qemu_allocate_irqs(sh_intc_set_irq, desc, nr_sources); |
466 |
|
467 |
memory_region_init_io(&desc->iomem, &sh_intc_ops, desc, |
468 |
"interrupt-controller", 0x100000000ULL); |
469 |
|
470 |
#define INT_REG_PARAMS(reg_struct, type, action, j) \
|
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reg_struct->action##_reg, #type, #action, j |
472 |
if (desc->mask_regs) {
|
473 |
for (i = 0; i < desc->nr_mask_regs; i++) { |
474 |
struct intc_mask_reg *mr = desc->mask_regs + i;
|
475 |
|
476 |
j += sh_intc_register(sysmem, desc, |
477 |
INT_REG_PARAMS(mr, mask, set, j)); |
478 |
j += sh_intc_register(sysmem, desc, |
479 |
INT_REG_PARAMS(mr, mask, clr, j)); |
480 |
} |
481 |
} |
482 |
|
483 |
if (desc->prio_regs) {
|
484 |
for (i = 0; i < desc->nr_prio_regs; i++) { |
485 |
struct intc_prio_reg *pr = desc->prio_regs + i;
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486 |
|
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j += sh_intc_register(sysmem, desc, |
488 |
INT_REG_PARAMS(pr, prio, set, j)); |
489 |
j += sh_intc_register(sysmem, desc, |
490 |
INT_REG_PARAMS(pr, prio, clr, j)); |
491 |
} |
492 |
} |
493 |
#undef INT_REG_PARAMS
|
494 |
|
495 |
return 0; |
496 |
} |
497 |
|
498 |
/* Assert level <n> IRL interrupt.
|
499 |
0:deassert. 1:lowest priority,... 15:highest priority. */
|
500 |
void sh_intc_set_irl(void *opaque, int n, int level) |
501 |
{ |
502 |
struct intc_source *s = opaque;
|
503 |
int i, irl = level ^ 15; |
504 |
for (i = 0; (s = sh_intc_source(s->parent, s->next_enum_id)); i++) { |
505 |
if (i == irl)
|
506 |
sh_intc_toggle_source(s, s->enable_count?0:1, s->asserted?0:1); |
507 |
else
|
508 |
if (s->asserted)
|
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sh_intc_toggle_source(s, 0, -1); |
510 |
} |
511 |
} |