/*
 * 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.h"
#include "omap.h"

#ifdef L4_MUX_HACK
static int omap_l4_io_entries;
static int omap_cpu_io_entry;
static struct omap_l4_entry {
        CPUReadMemoryFunc * const *mem_read;
        CPUWriteMemoryFunc * const *mem_write;
        void *opaque;
} *omap_l4_io_entry;
static CPUReadMemoryFunc * const *omap_l4_io_readb_fn;
static CPUReadMemoryFunc * const *omap_l4_io_readh_fn;
static CPUReadMemoryFunc * const *omap_l4_io_readw_fn;
static CPUWriteMemoryFunc * const *omap_l4_io_writeb_fn;
static CPUWriteMemoryFunc * const *omap_l4_io_writeh_fn;
static CPUWriteMemoryFunc * const *omap_l4_io_writew_fn;
static void **omap_l4_io_opaque;

int l4_register_io_memory(CPUReadMemoryFunc * const *mem_read,
                CPUWriteMemoryFunc * const *mem_write, void *opaque)
{
    omap_l4_io_entry[omap_l4_io_entries].mem_read = mem_read;
    omap_l4_io_entry[omap_l4_io_entries].mem_write = mem_write;
    omap_l4_io_entry[omap_l4_io_entries].opaque = opaque;

    return omap_l4_io_entries ++;
}

static uint32_t omap_l4_io_readb(void *opaque, target_phys_addr_t addr)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_readb_fn[i](omap_l4_io_opaque[i], addr);
}

static uint32_t omap_l4_io_readh(void *opaque, target_phys_addr_t addr)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_readh_fn[i](omap_l4_io_opaque[i], addr);
}

static uint32_t omap_l4_io_readw(void *opaque, target_phys_addr_t addr)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_readw_fn[i](omap_l4_io_opaque[i], addr);
}

static void omap_l4_io_writeb(void *opaque, target_phys_addr_t addr,
                uint32_t value)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_writeb_fn[i](omap_l4_io_opaque[i], addr, value);
}

static void omap_l4_io_writeh(void *opaque, target_phys_addr_t addr,
                uint32_t value)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_writeh_fn[i](omap_l4_io_opaque[i], addr, value);
}

static void omap_l4_io_writew(void *opaque, target_phys_addr_t addr,
                uint32_t value)
{
    unsigned int i = (addr - OMAP2_L4_BASE) >> TARGET_PAGE_BITS;

    return omap_l4_io_writew_fn[i](omap_l4_io_opaque[i], addr, value);
}

static CPUReadMemoryFunc * const omap_l4_io_readfn[] = {
    omap_l4_io_readb,
    omap_l4_io_readh,
    omap_l4_io_readw,
};

static CPUWriteMemoryFunc * const omap_l4_io_writefn[] = {
    omap_l4_io_writeb,
    omap_l4_io_writeh,
    omap_l4_io_writew,
};
#else
int l4_register_io_memory(CPUReadMemoryFunc * const *mem_read,
                          CPUWriteMemoryFunc * const *mem_write,
                          void *opaque)
{
    return cpu_register_io_memory(mem_read, mem_write, opaque,
                                  DEVICE_NATIVE_ENDIAN);
}
#endif

struct omap_l4_s {
    target_phys_addr_t base;
    int ta_num;
    struct omap_target_agent_s ta[0];
};

struct omap_l4_s *omap_l4_init(target_phys_addr_t base, int ta_num)
{
    struct omap_l4_s *bus = qemu_mallocz(
                    sizeof(*bus) + ta_num * sizeof(*bus->ta));

    bus->ta_num = ta_num;
    bus->base = base;

#ifdef L4_MUX_HACK
    omap_l4_io_entries = 1;
    omap_l4_io_entry = qemu_mallocz(125 * sizeof(*omap_l4_io_entry));

    omap_cpu_io_entry =
            cpu_register_io_memory(omap_l4_io_readfn,
                            omap_l4_io_writefn, bus, DEVICE_NATIVE_ENDIAN);
# define L4_PAGES	(0xb4000 / TARGET_PAGE_SIZE)
    omap_l4_io_readb_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_readh_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_readw_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_writeb_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_writeh_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_writew_fn = qemu_mallocz(sizeof(void *) * L4_PAGES);
    omap_l4_io_opaque = qemu_mallocz(sizeof(void *) * L4_PAGES);
#endif

    return bus;
}

static uint32_t omap_l4ta_read(void *opaque, target_phys_addr_t addr)
{
    struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;

    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, target_phys_addr_t addr,
                uint32_t value)
{
    struct omap_target_agent_s *s = (struct omap_target_agent_s *) opaque;

    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 CPUReadMemoryFunc * const omap_l4ta_readfn[] = {
    omap_badwidth_read16,
    omap_l4ta_read,
    omap_badwidth_read16,
};

static CPUWriteMemoryFunc * const omap_l4ta_writefn[] = {
    omap_badwidth_write32,
    omap_badwidth_write32,
    omap_l4ta_write,
};

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, iomemtype;
    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 */

    iomemtype = l4_register_io_memory(omap_l4ta_readfn,
                    omap_l4ta_writefn, ta);
    ta->base = omap_l4_attach(ta, info->ta_region, iomemtype);

    return ta;
}

target_phys_addr_t omap_l4_attach(struct omap_target_agent_s *ta, int region,
                int iotype)
{
    target_phys_addr_t base;
    ssize_t size;
#ifdef L4_MUX_HACK
    int i;
#endif

    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;
    size = ta->start[region].size;
    if (iotype) {
#ifndef L4_MUX_HACK
        cpu_register_physical_memory(base, size, iotype);
#else
        cpu_register_physical_memory(base, size, omap_cpu_io_entry);
        i = (base - ta->bus->base) / TARGET_PAGE_SIZE;
        for (; size > 0; size -= TARGET_PAGE_SIZE, i ++) {
            omap_l4_io_readb_fn[i] = omap_l4_io_entry[iotype].mem_read[0];
            omap_l4_io_readh_fn[i] = omap_l4_io_entry[iotype].mem_read[1];
            omap_l4_io_readw_fn[i] = omap_l4_io_entry[iotype].mem_read[2];
            omap_l4_io_writeb_fn[i] = omap_l4_io_entry[iotype].mem_write[0];
            omap_l4_io_writeh_fn[i] = omap_l4_io_entry[iotype].mem_write[1];
            omap_l4_io_writew_fn[i] = omap_l4_io_entry[iotype].mem_write[2];
            omap_l4_io_opaque[i] = omap_l4_io_entry[iotype].opaque;
        }
#endif
    }

    return base;
}