/*
* 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 "exec/address-spaces.h"
#include "hw/ppc/ppc.h"
#include "ppc405.h"
/*#define DEBUG_I2C*/
typedef struct ppc4xx_i2c_t ppc4xx_i2c_t;
struct ppc4xx_i2c_t {
qemu_irq irq;
MemoryRegion iomem;
uint8_t mdata;
uint8_t lmadr;
uint8_t hmadr;
uint8_t cntl;
uint8_t mdcntl;
uint8_t sts;
uint8_t extsts;
uint8_t sdata;
uint8_t lsadr;
uint8_t hsadr;
uint8_t clkdiv;
uint8_t intrmsk;
uint8_t xfrcnt;
uint8_t xtcntlss;
uint8_t directcntl;
};
static uint32_t ppc4xx_i2c_readb(void *opaque, hwaddr addr)
{
ppc4xx_i2c_t *i2c;
uint32_t ret;
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx "\n", __func__, addr);
#endif
i2c = opaque;
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" PRIx32 "\n", __func__, addr, ret);
#endif
return ret;
}
static void ppc4xx_i2c_writeb(void *opaque,
hwaddr addr, uint32_t value)
{
ppc4xx_i2c_t *i2c;
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx " val %08" PRIx32 "\n", __func__, addr,
value);
#endif
i2c = opaque;
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 uint32_t ppc4xx_i2c_readw(void *opaque, hwaddr addr)
{
uint32_t ret;
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx "\n", __func__, addr);
#endif
ret = ppc4xx_i2c_readb(opaque, addr) << 8;
ret |= ppc4xx_i2c_readb(opaque, addr + 1);
return ret;
}
static void ppc4xx_i2c_writew(void *opaque,
hwaddr addr, uint32_t value)
{
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx " val %08" PRIx32 "\n", __func__, addr,
value);
#endif
ppc4xx_i2c_writeb(opaque, addr, value >> 8);
ppc4xx_i2c_writeb(opaque, addr + 1, value);
}
static uint32_t ppc4xx_i2c_readl(void *opaque, hwaddr addr)
{
uint32_t ret;
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx "\n", __func__, addr);
#endif
ret = ppc4xx_i2c_readb(opaque, addr) << 24;
ret |= ppc4xx_i2c_readb(opaque, addr + 1) << 16;
ret |= ppc4xx_i2c_readb(opaque, addr + 2) << 8;
ret |= ppc4xx_i2c_readb(opaque, addr + 3);
return ret;
}
static void ppc4xx_i2c_writel(void *opaque,
hwaddr addr, uint32_t value)
{
#ifdef DEBUG_I2C
printf("%s: addr " TARGET_FMT_plx " val %08" PRIx32 "\n", __func__, addr,
value);
#endif
ppc4xx_i2c_writeb(opaque, addr, value >> 24);
ppc4xx_i2c_writeb(opaque, addr + 1, value >> 16);
ppc4xx_i2c_writeb(opaque, addr + 2, value >> 8);
ppc4xx_i2c_writeb(opaque, addr + 3, value);
}
static const MemoryRegionOps i2c_ops = {
.old_mmio = {
.read = { ppc4xx_i2c_readb, ppc4xx_i2c_readw, ppc4xx_i2c_readl, },
.write = { ppc4xx_i2c_writeb, ppc4xx_i2c_writew, ppc4xx_i2c_writel, },
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void ppc4xx_i2c_reset(void *opaque)
{
ppc4xx_i2c_t *i2c;
i2c = opaque;
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;
}
void ppc405_i2c_init(hwaddr base, qemu_irq irq)
{
ppc4xx_i2c_t *i2c;
i2c = g_malloc0(sizeof(ppc4xx_i2c_t));
i2c->irq = irq;
#ifdef DEBUG_I2C
printf("%s: offset " TARGET_FMT_plx "\n", __func__, base);
#endif
memory_region_init_io(&i2c->iomem, NULL, &i2c_ops, i2c, "i2c", 0x011);
memory_region_add_subregion(get_system_memory(), base, &i2c->iomem);
qemu_register_reset(ppc4xx_i2c_reset, i2c);
}
