1 files changed, 512 insertions, 0 deletions

diff --git a/src/hw/intc/sh_intc.c b/src/hw/intc/sh_intc.c
new file mode 100644
index 0000000..55c76e4
--- /dev/null
+++ b/src/hw/intc/sh_intc.c
@@ -0,0 +1,512 @@
+/*
+ * 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 "hw/sh4/sh_intc.h"
+#include "hw/hw.h"
+#include "hw/sh4/sh.h"
+
+//#define DEBUG_INTC
+//#define DEBUG_INTC_SOURCES
+
+#define INTC_A7(x) ((x) & 0x1fffffff)
+
+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
+  }
+}
+
+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) {
+#ifdef DEBUG_INTC_SOURCES
+            printf("sh_intc: (%d) returning interrupt source 0x%x\n",
+		   desc->pending, source->vect);
+#endif
+            return source->vect;
+	}
+    }
+
+    abort();
+}
+
+#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;
+	}
+    }
+
+    abort();
+}
+
+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)) {
+#ifdef DEBUG_INTC_SOURCES
+        printf("sh_intc: reserved interrupt source %d modified\n", id);
+#endif
+	return;
+    }
+
+    if (source->vect)
+        sh_intc_toggle_source(source, enable ? 1 : -1, 0);
+
+#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_mask(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 uint64_t sh_intc_read(void *opaque, hwaddr offset,
+                             unsigned size)
+{
+    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, hwaddr offset,
+                          uint64_t value, unsigned size)
+{
+    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: abort();
+    }
+
+    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_mask(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 const MemoryRegionOps sh_intc_ops = {
+    .read = sh_intc_read,
+    .write = sh_intc_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id)
+{
+    if (id)
+        return desc->sources + id;
+
+    return NULL;
+}
+
+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;
+
+#define SH_INTC_IOMEM_FORMAT "interrupt-controller-%s-%s-%s"
+    snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "p4");
+    memory_region_init_alias(iomem_p4, NULL, name, iomem, INTC_A7(address), 4);
+    memory_region_add_subregion(sysmem, P4ADDR(address), iomem_p4);
+
+    snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "a7");
+    memory_region_init_alias(iomem_a7, NULL, name, iomem, INTC_A7(address), 4);
+    memory_region_add_subregion(sysmem, A7ADDR(address), iomem_a7);
+#undef SH_INTC_IOMEM_FORMAT
+
+    /* used to increment aliases index */
+    return 2;
+}
+
+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 < ARRAY_SIZE(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 < ARRAY_SIZE(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 < ARRAY_SIZE(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_SOURCES
+            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 < ARRAY_SIZE(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_SOURCES
+	    printf("sh_intc: registered group %d (%d/%d)\n",
+		   gr->enum_id, s->enable_count, s->enable_max);
+#endif
+	}
+    }
+}
+
+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);
+
+    j = 0;
+    i = sizeof(struct intc_source) * nr_sources;
+    desc->sources = g_malloc0(i);
+
+    for (i = 0; i < desc->nr_sources; i++) {
+        struct intc_source *source = desc->sources + i;
+
+        source->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,
+                          "interrupt-controller", 0x100000000ULL);
+
+#define INT_REG_PARAMS(reg_struct, type, action, j) \
+        reg_struct->action##_reg, #type, #action, j
+    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,
+                                  INT_REG_PARAMS(mr, mask, set, j));
+            j += sh_intc_register(sysmem, desc,
+                                  INT_REG_PARAMS(mr, 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,
+                                  INT_REG_PARAMS(pr, prio, set, j));
+            j += sh_intc_register(sysmem, desc,
+                                  INT_REG_PARAMS(pr, prio, clr, j));
+	}
+    }
+#undef INT_REG_PARAMS
+
+    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;
+    for (i = 0; (s = sh_intc_source(s->parent, s->next_enum_id)); i++) {
+	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);
+    }
+}