hw/sh4: Coding style: Add missing braces

[qemu.git] / hw / intc / sh_intc.c

/*
 * 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 "cpu.h"
#include "hw/sh4/sh_intc.h"
#include "hw/irq.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);
        }
    }
}