Archipelago » qemu

/*

 * TI OMAP L4 interconnect emulation.

 *

 * Copyright (C) 2007-2009 Nokia Corporation

 * Written by Andrzej Zaborowski <andrew@openedhand.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 or

 * (at your option) any later version of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw/hw.h"

#include "hw/arm/omap.h"

struct omap_l4_s {

    MemoryRegion *address_space;

    hwaddr base;

    int ta_num;

    struct omap_target_agent_s ta[0];

};

struct omap_l4_s *omap_l4_init(MemoryRegion *address_space,

                               hwaddr base, int ta_num)

{

    struct omap_l4_s *bus = g_malloc0(

                    sizeof(*bus) + ta_num * sizeof(*bus->ta));

    bus->address_space = address_space;

    bus->ta_num = ta_num;

    bus->base = base;

    return bus;

}

hwaddr omap_l4_region_base(struct omap_target_agent_s *ta,

                                       int region)

{

    return ta->bus->base + ta->start[region].offset;

}

hwaddr omap_l4_region_size(struct omap_target_agent_s *ta,

                                       int region)

{

    return ta->start[region].size;

}

static uint64_t omap_l4ta_read(void *opaque, hwaddr addr,

                               unsigned size)

{

    struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;

    if (size != 2) {

        return omap_badwidth_read16(opaque, addr);

    }

    switch (addr) {

    case 0x00:        /* COMPONENT */

        return s->component;

    case 0x20:        /* AGENT_CONTROL */

        return s->control;

    case 0x28:        /* AGENT_STATUS */

        return s->status;

    }

    OMAP_BAD_REG(addr);

    return 0;

}

static void omap_l4ta_write(void *opaque, hwaddr addr,

                            uint64_t value, unsigned size)

{

    struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;

    if (size != 4) {

        return omap_badwidth_write32(opaque, addr, value);

    }

    switch (addr) {

    case 0x00:        /* COMPONENT */

    case 0x28:        /* AGENT_STATUS */

        OMAP_RO_REG(addr);

        break;

    case 0x20:        /* AGENT_CONTROL */

        s->control = value & 0x01000700;

        if (value & 1)                                        /* OCP_RESET */

            s->status &= ~1;                                /* REQ_TIMEOUT */

        break;

    default:

        OMAP_BAD_REG(addr);

    }

}

static const MemoryRegionOps omap_l4ta_ops = {

    .read = omap_l4ta_read,

    .write = omap_l4ta_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

struct omap_target_agent_s *omap_l4ta_get(struct omap_l4_s *bus,

        const struct omap_l4_region_s *regions,

        const struct omap_l4_agent_info_s *agents,

        int cs)

{

    int i;

    struct omap_target_agent_s *ta = NULL;

    const struct omap_l4_agent_info_s *info = NULL;

    for (i = 0; i < bus->ta_num; i ++)

        if (agents[i].ta == cs) {

            ta = &bus->ta[i];

            info = &agents[i];

            break;

        }

    if (!ta) {

        fprintf(stderr, "%s: bad target agent (%i)\n", __FUNCTION__, cs);

        exit(-1);

    }

    ta->bus = bus;

    ta->start = &regions[info->region];

    ta->regions = info->regions;

    ta->component = ('Q' << 24) | ('E' << 16) | ('M' << 8) | ('U' << 0);

    ta->status = 0x00000000;

    ta->control = 0x00000200;        /* XXX 01000200 for L4TAO */

    memory_region_init_io(&ta->iomem, &omap_l4ta_ops, ta, "omap.l4ta",

                          omap_l4_region_size(ta, info->ta_region));

    omap_l4_attach(ta, info->ta_region, &ta->iomem);

    return ta;

}

hwaddr omap_l4_attach(struct omap_target_agent_s *ta,

                                         int region, MemoryRegion *mr)

{

    hwaddr base;

    if (region < 0 || region >= ta->regions) {

        fprintf(stderr, "%s: bad io region (%i)\n", __FUNCTION__, region);

        exit(-1);

    }

    base = ta->bus->base + ta->start[region].offset;

    if (mr) {

        memory_region_add_subregion(ta->bus->address_space, base, mr);

    }

    return base;

}