xref: /qemu/hw/i2c/ppc4xx_i2c.c (revision 3b09bb0fb9bc03f3897da4940ba2fb808c00c038)

/*
 * PPC4xx I2C controller emulation
 *
 * Copyright (c) 2007 Jocelyn Mayer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/i2c/ppc4xx_i2c.h"

/*#define DEBUG_I2C*/

#define PPC4xx_I2C_MEM_SIZE 0x11

static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr addr, unsigned int size)
{
    PPC4xxI2CState *i2c = PPC4xx_I2C(opaque);
    uint64_t ret;

#ifdef DEBUG_I2C
    printf("%s: addr " TARGET_FMT_plx "\n", __func__, addr);
#endif
    switch (addr) {
    case 0x00:
        /*i2c_readbyte(&i2c->mdata);*/
        ret = i2c->mdata;
        break;
    case 0x02:
        ret = i2c->sdata;
        break;
    case 0x04:
        ret = i2c->lmadr;
        break;
    case 0x05:
        ret = i2c->hmadr;
        break;
    case 0x06:
        ret = i2c->cntl;
        break;
    case 0x07:
        ret = i2c->mdcntl;
        break;
    case 0x08:
        ret = i2c->sts;
        break;
    case 0x09:
        ret = i2c->extsts;
        break;
    case 0x0A:
        ret = i2c->lsadr;
        break;
    case 0x0B:
        ret = i2c->hsadr;
        break;
    case 0x0C:
        ret = i2c->clkdiv;
        break;
    case 0x0D:
        ret = i2c->intrmsk;
        break;
    case 0x0E:
        ret = i2c->xfrcnt;
        break;
    case 0x0F:
        ret = i2c->xtcntlss;
        break;
    case 0x10:
        ret = i2c->directcntl;
        break;
    default:
        ret = 0x00;
        break;
    }
#ifdef DEBUG_I2C
    printf("%s: addr " TARGET_FMT_plx " %02" PRIx64 "\n", __func__, addr, ret);
#endif

    return ret;
}

static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value,
                              unsigned int size)
{
    PPC4xxI2CState *i2c = opaque;
#ifdef DEBUG_I2C
    printf("%s: addr " TARGET_FMT_plx " val %08" PRIx64 "\n",
           __func__, addr, value);
#endif
    switch (addr) {
    case 0x00:
        i2c->mdata = value;
        /*i2c_sendbyte(&i2c->mdata);*/
        break;
    case 0x02:
        i2c->sdata = value;
        break;
    case 0x04:
        i2c->lmadr = value;
        break;
    case 0x05:
        i2c->hmadr = value;
        break;
    case 0x06:
        i2c->cntl = value;
        break;
    case 0x07:
        i2c->mdcntl = value & 0xDF;
        break;
    case 0x08:
        i2c->sts &= ~(value & 0x0A);
        break;
    case 0x09:
        i2c->extsts &= ~(value & 0x8F);
        break;
    case 0x0A:
        i2c->lsadr = value;
        break;
    case 0x0B:
        i2c->hsadr = value;
        break;
    case 0x0C:
        i2c->clkdiv = value;
        break;
    case 0x0D:
        i2c->intrmsk = value;
        break;
    case 0x0E:
        i2c->xfrcnt = value & 0x77;
        break;
    case 0x0F:
        i2c->xtcntlss = value;
        break;
    case 0x10:
        i2c->directcntl = value & 0x7;
        break;
    }
}

static const MemoryRegionOps ppc4xx_i2c_ops = {
    .read = ppc4xx_i2c_readb,
    .write = ppc4xx_i2c_writeb,
    .valid.min_access_size = 1,
    .valid.max_access_size = 4,
    .impl.min_access_size = 1,
    .impl.max_access_size = 1,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void ppc4xx_i2c_reset(DeviceState *s)
{
    PPC4xxI2CState *i2c = PPC4xx_I2C(s);

    i2c->mdata = 0x00;
    i2c->sdata = 0x00;
    i2c->cntl = 0x00;
    i2c->mdcntl = 0x00;
    i2c->sts = 0x00;
    i2c->extsts = 0x00;
    i2c->clkdiv = 0x00;
    i2c->xfrcnt = 0x00;
    i2c->directcntl = 0x0F;
}

static void ppc4xx_i2c_init(Object *o)
{
    PPC4xxI2CState *s = PPC4xx_I2C(o);

    memory_region_init_io(&s->iomem, OBJECT(s), &ppc4xx_i2c_ops, s,
                          TYPE_PPC4xx_I2C, PPC4xx_I2C_MEM_SIZE);
    sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
    sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
    s->bus = i2c_init_bus(DEVICE(s), "i2c");
}

static void ppc4xx_i2c_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->reset = ppc4xx_i2c_reset;
}

static const TypeInfo ppc4xx_i2c_type_info = {
    .name = TYPE_PPC4xx_I2C,
    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(PPC4xxI2CState),
    .instance_init = ppc4xx_i2c_init,
    .class_init = ppc4xx_i2c_class_init,
};

static void ppc4xx_i2c_register_types(void)
{
    type_register_static(&ppc4xx_i2c_type_info);
}

type_init(ppc4xx_i2c_register_types)