/*
* TI OMAP on-chip I2C controller. Only "new I2C" mode supported.
*
* Copyright (C) 2007 Andrzej Zaborowski <balrog@zabor.org>
*
* 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 of
* the License, or (at your option) any later version.
*
* 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/i2c/i2c.h"
#include "hw/arm/omap.h"
#include "hw/sysbus.h"
#define TYPE_OMAP_I2C "omap_i2c"
#define OMAP_I2C(obj) OBJECT_CHECK(OMAPI2CState, (obj), TYPE_OMAP_I2C)
typedef struct OMAPI2CState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq irq;
qemu_irq drq[2];
I2CBus *bus;
uint8_t revision;
void *iclk;
void *fclk;
uint8_t mask;
uint16_t stat;
uint16_t dma;
uint16_t count;
int count_cur;
uint32_t fifo;
int rxlen;
int txlen;
uint16_t control;
uint16_t addr[2];
uint8_t divider;
uint8_t times[2];
uint16_t test;
} OMAPI2CState;
#define OMAP2_INTR_REV 0x34
#define OMAP2_GC_REV 0x34
static void omap_i2c_interrupts_update(OMAPI2CState *s)
{
qemu_set_irq(s->irq, s->stat & s->mask);
if ((s->dma >> 15) & 1) /* RDMA_EN */
qemu_set_irq(s->drq[0], (s->stat >> 3) & 1); /* RRDY */
if ((s->dma >> 7) & 1) /* XDMA_EN */
qemu_set_irq(s->drq[1], (s->stat >> 4) & 1); /* XRDY */
}
static void omap_i2c_fifo_run(OMAPI2CState *s)
{
int ack = 1;
if (!i2c_bus_busy(s->bus))
return;
if ((s->control >> 2) & 1) { /* RM */
if ((s->control >> 1) & 1) { /* STP */
i2c_end_transfer(s->bus);
s->control &= ~(1 << 1); /* STP */
s->count_cur = s->count;
s->txlen = 0;
} else if ((s->control >> 9) & 1) { /* TRX */
while (ack && s->txlen)
ack = (i2c_send(s->bus,
(s->fifo >> ((-- s->txlen) << 3)) &
0xff) >= 0);
s->stat |= 1 << 4; /* XRDY */
} else {
while (s->rxlen < 4)
s->fifo |= i2c_recv(s->bus) << ((s->rxlen ++) << 3);
s->stat |= 1 << 3; /* RRDY */
}
} else {
if ((s->control >> 9) & 1) { /* TRX */
while (ack && s->count_cur && s->txlen) {
ack = (i2c_send(s->bus,
(s->fifo >> ((-- s->txlen) << 3)) &
0xff) >= 0);
s->count_cur --;
}
if (ack && s->count_cur)
s->stat |= 1 << 4; /* XRDY */
else
s->stat &= ~(1 << 4); /* XRDY */
if (!s->count_cur) {
s->stat |= 1 << 2; /* ARDY */
s->control &= ~(1 << 10); /* MST */
}
} else {
while (s->count_cur && s->rxlen < 4) {
s->fifo |= i2c_recv(s->bus) << ((s->rxlen ++) << 3);
s->count_cur --;
}
if (s->rxlen)
s->stat |= 1 << 3; /* RRDY */
else
s->stat &= ~(1 << 3); /* RRDY */
}
if (!s->count_cur) {
if ((s->control >> 1) & 1) { /* STP */
i2c_end_transfer(s->bus);
s->control &= ~(1 << 1); /* STP */
s->count_cur = s->count;
s->txlen = 0;
} else {
s->stat |= 1 << 2; /* ARDY */
s->control &= ~(1 << 10); /* MST */
}
}
}
s->stat |= (!ack) << 1; /* NACK */
if (!ack)
s->control &= ~(1 << 1); /* STP */
}
static void omap_i2c_reset(DeviceState *dev)
{
OMAPI2CState *s = OMAP_I2C(dev);
s->mask = 0;
s->stat = 0;
s->dma = 0;
s->count = 0;
s->count_cur = 0;
s->fifo = 0;
s->rxlen = 0;
s->txlen = 0;
s->control = 0;
s->addr[0] = 0;
s->addr[1] = 0;
s->divider = 0;
s->times[0] = 0;
s->times[1] = 0;
s->test = 0;
}
static uint32_t omap_i2c_read(void *opaque, hwaddr addr)
{
OMAPI2CState *s = opaque;
int offset = addr & OMAP_MPUI_REG_MASK;
uint16_t ret;
switch (offset) {
case 0x00: /* I2C_REV */
return s->revision; /* REV */
case 0x04: /* I2C_IE */
return s->mask;
case 0x08: /* I2C_STAT */
return s->stat | (i2c_bus_busy(s->bus) << 12);
case 0x0c: /* I2C_IV */
if (s->revision >= OMAP2_INTR_REV)
break;
ret = ctz32(s->stat & s->mask);
if (ret != 32) {
s->stat ^= 1 << ret;
ret++;
} else {
ret = 0;
}
omap_i2c_interrupts_update(s);
return ret;
case 0x10: /* I2C_SYSS */
return (s->control >> 15) & 1; /* I2C_EN */
case 0x14: /* I2C_BUF */
return s->dma;
case 0x18: /* I2C_CNT */
return s->count_cur; /* DCOUNT */
case 0x1c: /* I2C_DATA */
ret = 0;
if (s->control & (1 << 14)) { /* BE */
ret |= ((s->fifo >> 0) & 0xff) << 8;
ret |= ((s->fifo >> 8) & 0xff) << 0;
} else {
ret |= ((s->fifo >> 8) & 0xff) << 8;
ret |= ((s->fifo >> 0) & 0xff) << 0;
}
if (s->rxlen == 1) {
s->stat |= 1 << 15; /* SBD */
s->rxlen = 0;
} else if (s->rxlen > 1) {
if (s->rxlen > 2)
s->fifo >>= 16;
s->rxlen -= 2;
} else {
/* XXX: remote access (qualifier) error - what's that? */
}
if (!s->rxlen) {
s->stat &= ~(1 << 3); /* RRDY */
if (((s->control >> 10) & 1) && /* MST */
((~s->control >> 9) & 1)) { /* TRX */
s->stat |= 1 << 2; /* ARDY */
s->control &= ~(1 << 10); /* MST */
}
}
s->stat &= ~(1 << 11); /* ROVR */
omap_i2c_fifo_run(s);
omap_i2c_interrupts_update(s);
return ret;
case 0x20: /* I2C_SYSC */
return 0;
case 0x24: /* I2C_CON */
return s->control;
case 0x28: /* I2C_OA */
return s->addr[0];
case 0x2c: /* I2C_SA */
return s->addr[1];
case 0x30: /* I2C_PSC */
return s->divider;
case 0x34: /* I2C_SCLL */
return s->times[0];
case 0x38: /* I2C_SCLH */
return s->times[1];
case 0x3c: /* I2C_SYSTEST */
if (s->test & (1 << 15)) { /* ST_EN */
s->test ^= 0xa;
return s->test;
} else
return s->test & ~0x300f;
}
OMAP_BAD_REG(addr);
return 0;
}
static void omap_i2c_write(void *opaque, hwaddr addr,
uint32_t value)
{
OMAPI2CState *s = opaque;
int offset = addr & OMAP_MPUI_REG_MASK;
int nack;
switch (offset) {
case 0x00: /* I2C_REV */
case 0x0c: /* I2C_IV */
case 0x10: /* I2C_SYSS */
OMAP_RO_REG(addr);
return;
case 0x04: /* I2C_IE */
s->mask = value & (s->revision < OMAP2_GC_REV ? 0x1f : 0x3f);
break;
case 0x08: /* I2C_STAT */
if (s->revision < OMAP2_INTR_REV) {
OMAP_RO_REG(addr);
return;
}
/* RRDY and XRDY are reset by hardware. (in all versions???) */
s->stat &= ~(value & 0x27);
omap_i2c_interrupts_update(s);
break;
case 0x14: /* I2C_BUF */
s->dma = value & 0x8080;
if (value & (1 << 15)) /* RDMA_EN */
s->mask &= ~(1 << 3); /* RRDY_IE */
if (value & (1 << 7)) /* XDMA_EN */
s->mask &= ~(1 << 4); /* XRDY_IE */
break;
case 0x18: /* I2C_CNT */
s->count = value; /* DCOUNT */
break;
case 0x1c: /* I2C_DATA */
if (s->txlen > 2) {
/* XXX: remote access (qualifier) error - what's that? */
break;
}
s->fifo <<= 16;
s->txlen += 2;
if (s->control & (1 << 14)) { /* BE */
s->fifo |= ((value >> 8) & 0xff) << 8;
s->fifo |= ((value >> 0) & 0xff) << 0;
} else {
s->fifo |= ((value >> 0) & 0xff) << 8;
s->fifo |= ((value >> 8) & 0xff) << 0;
}
s->stat &= ~(1 << 10); /* XUDF */
if (s->txlen > 2)
s->stat &= ~(1 << 4); /* XRDY */
omap_i2c_fifo_run(s);
omap_i2c_interrupts_update(s);
break;
case 0x20: /* I2C_SYSC */
if (s->revision < OMAP2_INTR_REV) {
OMAP_BAD_REG(addr);
return;
}
if (value & 2) {
omap_i2c_reset(DEVICE(s));
}
break;
case 0x24: /* I2C_CON */
s->control = value & 0xcf87;
if (~value & (1 << 15)) { /* I2C_EN */
if (s->revision < OMAP2_INTR_REV) {
omap_i2c_reset(DEVICE(s));
}
break;
}
if ((value & (1 << 15)) && !(value & (1 << 10))) { /* MST */
fprintf(stderr, "%s: I^2C slave mode not supported\n",
__FUNCTION__);
break;
}
if ((value & (1 << 15)) && value & (1 << 8)) { /* XA */
fprintf(stderr, "%s: 10-bit addressing mode not supported\n",
__FUNCTION__);
break;
}
if ((value & (1 << 15)) && value & (1 << 0)) { /* STT */
nack = !!i2c_start_transfer(s->bus, s->addr[1], /* SA */
(~value >> 9) & 1); /* TRX */
s->stat |= nack << 1; /* NACK */
s->control &= ~(1 << 0); /* STT */
s->fifo = 0;
if (nack)
s->control &= ~(1 << 1); /* STP */
else {
s->count_cur = s->count;
omap_i2c_fifo_run(s);
}
omap_i2c_interrupts_update(s);
}
break;
case 0x28: /* I2C_OA */
s->addr[0] = value & 0x3ff;
break;
case 0x2c: /* I2C_SA */
s->addr[1] = value & 0x3ff;
break;
case 0x30: /* I2C_PSC */
s->divider = value;
break;
case 0x34: /* I2C_SCLL */
s->times[0] = value;
break;
case 0x38: /* I2C_SCLH */
s->times[1] = value;
break;
case 0x3c: /* I2C_SYSTEST */
s->test = value & 0xf80f;
if (value & (1 << 11)) /* SBB */
if (s->revision >= OMAP2_INTR_REV) {
s->stat |= 0x3f;
omap_i2c_interrupts_update(s);
}
if (value & (1 << 15)) /* ST_EN */
fprintf(stderr, "%s: System Test not supported\n", __FUNCTION__);
break;
default:
OMAP_BAD_REG(addr);
return;
}
}
static void omap_i2c_writeb(void *opaque, hwaddr addr,
uint32_t value)
{
OMAPI2CState *s = opaque;
int offset = addr & OMAP_MPUI_REG_MASK;
switch (offset) {
case 0x1c: /* I2C_DATA */
if (s->txlen > 2) {
/* XXX: remote access (qualifier) error - what's that? */
break;
}
s->fifo <<= 8;
s->txlen += 1;
s->fifo |= value & 0xff;
s->stat &= ~(1 << 10); /* XUDF */
if (s->txlen > 2)
s->stat &= ~(1 << 4); /* XRDY */
omap_i2c_fifo_run(s);
omap_i2c_interrupts_update(s);
break;
default:
OMAP_BAD_REG(addr);
return;
}
}
static const MemoryRegionOps omap_i2c_ops = {
.old_mmio = {
.read = {
omap_badwidth_read16,
omap_i2c_read,
omap_badwidth_read16,
},
.write = {
omap_i2c_writeb, /* Only the last fifo write can be 8 bit. */
omap_i2c_write,
omap_badwidth_write16,
},
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static int omap_i2c_init(SysBusDevice *sbd)
{
DeviceState *dev = DEVICE(sbd);
OMAPI2CState *s = OMAP_I2C(dev);
if (!s->fclk) {
hw_error("omap_i2c: fclk not connected\n");
}
if (s->revision >= OMAP2_INTR_REV && !s->iclk) {
/* Note that OMAP1 doesn't have a separate interface clock */
hw_error("omap_i2c: iclk not connected\n");
}
sysbus_init_irq(sbd, &s->irq);
sysbus_init_irq(sbd, &s->drq[0]);
sysbus_init_irq(sbd, &s->drq[1]);
memory_region_init_io(&s->iomem, OBJECT(s), &omap_i2c_ops, s, "omap.i2c",
(s->revision < OMAP2_INTR_REV) ? 0x800 : 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
s->bus = i2c_init_bus(dev, NULL);
return 0;
}
static Property omap_i2c_properties[] = {
DEFINE_PROP_UINT8("revision", OMAPI2CState, revision, 0),
DEFINE_PROP_PTR("iclk", OMAPI2CState, iclk),
DEFINE_PROP_PTR("fclk", OMAPI2CState, fclk),
DEFINE_PROP_END_OF_LIST(),
};
static void omap_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = omap_i2c_init;
dc->props = omap_i2c_properties;
dc->reset = omap_i2c_reset;
/* Reason: pointer properties "iclk", "fclk" */
dc->cannot_instantiate_with_device_add_yet = true;
}
static const TypeInfo omap_i2c_info = {
.name = TYPE_OMAP_I2C,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(OMAPI2CState),
.class_init = omap_i2c_class_init,
};
static void omap_i2c_register_types(void)
{
type_register_static(&omap_i2c_info);
}
I2CBus *omap_i2c_bus(DeviceState *omap_i2c)
{
OMAPI2CState *s = OMAP_I2C(omap_i2c);
return s->bus;
}
type_init(omap_i2c_register_types)
