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/*
* 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)
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