/*
* i2c_set_bus_num():
* ------------------
*
* Change the active I2C bus. Subsequent read/write calls will
* go to this one. Sets all of the muxes in a proper condition
* if that bus is behind muxes.
* If previously selected bus is behind the muxes turns off all the
* muxes along the path to that bus.
*
* bus - bus index, zero based
*
* Returns: 0 on success, not 0 on failure
*/
int i2c_set_bus_num(unsigned int bus)
{
int max;
if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0))
return 0;
#ifndef CONFIG_SYS_I2C_DIRECT_BUS
if (bus >= CONFIG_SYS_NUM_I2C_BUSES)
return -1;
#endif
max = ll_entry_count(struct i2c_adapter, i2c);
if (I2C_ADAPTER(bus) >= max) {
printf("Error, wrong i2c adapter %d max %d possible\n",
I2C_ADAPTER(bus), max);
return -2;
}
#ifndef CONFIG_SYS_I2C_DIRECT_BUS
i2c_mux_disconnet_all();
#endif
gd->cur_i2c_bus = bus;
if (I2C_ADAP->init_done == 0)
i2c_init_bus(bus, I2C_ADAP->speed, I2C_ADAP->slaveaddr);
#ifndef CONFIG_SYS_I2C_DIRECT_BUS
i2c_mux_set_all();
#endif
return 0;
}
int shw_i2c_io_init(void)
{
if (i2c_init_bus(&i2c_io_bus) < 0) {
pr_error("I2C I/O init failed for bus %s\n", i2c_io_bus.name);
return -1;
}
pr_debug("I2C I/O init success for bus %s\n", i2c_io_bus.name);
return 0;
}
static void imx_i2c_realize(DeviceState *dev, Error **errp)
{
IMXI2CState *s = IMX_I2C(dev);
memory_region_init_io(&s->iomem, OBJECT(s), &imx_i2c_ops, s, TYPE_IMX_I2C,
IMX_I2C_MEM_SIZE);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
s->bus = i2c_init_bus(DEVICE(dev), "i2c");
}
static int realview_i2c_init(SysBusDevice *dev)
{
RealViewI2CState *s = FROM_SYSBUS(RealViewI2CState, dev);
i2c_bus *bus;
bus = i2c_init_bus(&dev->qdev, "i2c");
s->bitbang = bitbang_i2c_init(bus);
memory_region_init_io(&s->iomem, &realview_i2c_ops, s,
"realview-i2c", 0x1000);
sysbus_init_mmio_region(dev, &s->iomem);
return 0;
}
static int realview_i2c_init(SysBusDevice *dev)
{
RealViewI2CState *s = FROM_SYSBUS(RealViewI2CState, dev);
i2c_bus *bus;
int iomemtype;
bus = i2c_init_bus(&dev->qdev, "i2c");
s->bitbang = bitbang_i2c_init(bus);
iomemtype = cpu_register_io_memory(realview_i2c_readfn,
realview_i2c_writefn, s);
sysbus_init_mmio(dev, 0x1000, iomemtype);
return 0;
}
static void pca954x_init(Object *obj)
{
PCA954XState *s = PCA954X(obj);
PCA954XClass *sc = PCA954X_GET_CLASS(obj);
int i;
if (sc->device) {
s->mux = sc->device->mux;
s->lanes = sc->device->lanes;
} else {
/* Emulate pca9548 device as default */
s->mux = false;
s->lanes = 8;
}
for (i = 0; i < s->lanes; ++i) {
char bus_name[16];
snprintf(bus_name, sizeof(bus_name), "i2c@%d", i);
s->busses[i] = i2c_init_bus(DEVICE(s), bus_name);
}
}
/*
* Address Definitions
*
* 0x000 ... 0x03F: Global Register
* 0x040 ... 0x07F: Device 1
* 0x080 ... 0x0BF: Device 2
* 0x0C0 ... 0x0FF: Device 3
* 0x100 ... 0x13F: Device 4
* 0x140 ... 0x17F: Device 5
* 0x180 ... 0x1BF: Device 6
* 0x1C0 ... 0x1FF: Device 7
* 0x200 ... 0x2FF: Buffer Pool (unused in linux driver)
* 0x300 ... 0x33F: Device 8
* 0x340 ... 0x37F: Device 9
* 0x380 ... 0x3BF: Device 10
* 0x3C0 ... 0x3FF: Device 11
* 0x400 ... 0x43F: Device 12
* 0x440 ... 0x47F: Device 13
* 0x480 ... 0x4BF: Device 14
* 0x800 ... 0xFFF: Buffer Pool (unused in linux driver)
*/
static void aspeed_i2c_realize(DeviceState *dev, Error **errp)
{
int i;
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
AspeedI2CState *s = ASPEED_I2C(dev);
sysbus_init_irq(sbd, &s->irq);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_i2c_ctrl_ops, s,
"aspeed.i2c", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
for (i = 0; i < ASPEED_I2C_NR_BUSSES; i++) {
char name[16];
int offset = i < 7 ? 1 : 5;
snprintf(name, sizeof(name), "aspeed.i2c.%d", i);
s->busses[i].controller = s;
s->busses[i].id = i;
s->busses[i].bus = i2c_init_bus(dev, name);
memory_region_init_io(&s->busses[i].mr, OBJECT(dev),
&aspeed_i2c_bus_ops, &s->busses[i], name, 0x40);
memory_region_add_subregion(&s->iomem, 0x40 * (i + offset),
&s->busses[i].mr);
}
}
static void aux_bridge_init(Object *obj)
{
AUXTOI2CState *s = AUXTOI2C(obj);
s->i2c_bus = i2c_init_bus(DEVICE(obj), "aux-i2c");
}
void __i2c_init(int speed, int slaveaddr)
{
i2c_init_bus(i2c_get_bus_num(), speed, slaveaddr);
}
