static int lpss_i2c_early_init_bus(unsigned int bus)
{
const struct dw_i2c_bus_config *config;
const struct device *tree_dev;
pci_devfn_t dev;
int devfn;
uintptr_t base;
/* Find the PCI device for this bus controller */
devfn = dw_i2c_soc_bus_to_devfn(bus);
if (devfn < 0) {
printk(BIOS_ERR, "I2C%u device not found\n", bus);
return -1;
}
/* Look up the controller device in the devicetree */
dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
tree_dev = dev_find_slot(0, devfn);
if (!tree_dev || !tree_dev->enabled) {
printk(BIOS_ERR, "I2C%u device not enabled\n", bus);
return -1;
}
/* Skip if not enabled for early init */
config = dw_i2c_get_soc_cfg(bus);
if (!config || !config->early_init) {
printk(BIOS_DEBUG, "I2C%u not enabled for early init\n", bus);
return -1;
}
/* Prepare early base address for access before memory */
base = dw_i2c_get_soc_early_base(bus);
pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
pci_write_config32(dev, PCI_COMMAND,
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
/* Take device out of reset */
lpss_reset_release(base);
/* Initialize the controller */
if (dw_i2c_init(bus, config) < 0) {
printk(BIOS_ERR, "I2C%u failed to initialize\n", bus);
return -1;
}
return 0;
}
/*
* This function ensures that the device is actually out of reset and
* its ready for initialization sequence.
*/
static void dw_i2c_device_init(struct device *dev)
{
uintptr_t base_address;
int bus = dw_i2c_soc_dev_to_bus(dev);
if (bus < 0)
return;
base_address = dw_i2c_base_address(bus);
if (!base_address)
return;
/* Take device out of reset if its not done before */
if (lpss_is_controller_in_reset(base_address))
lpss_reset_release(base_address);
dw_i2c_dev_init(dev);
}
static void i2c_early_init_bus(unsigned int bus)
{
ROMSTAGE_CONST struct soc_intel_skylake_config *config;
ROMSTAGE_CONST struct device *tree_dev;
pci_devfn_t dev;
int devfn;
uintptr_t base;
/* Find the PCI device for this bus controller */
devfn = i2c_bus_to_devfn(bus);
if (devfn < 0)
return;
/* Look up the controller device in the devicetree */
dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
tree_dev = dev_find_slot(0, devfn);
if (!tree_dev || !tree_dev->enabled)
return;
/* Skip if not enabled for early init */
config = tree_dev->chip_info;
if (!config)
return;
if (!config->i2c[bus].early_init)
return;
/* Prepare early base address for access before memory */
base = EARLY_I2C_BASE(bus);
pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
pci_write_config32(dev, PCI_COMMAND,
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
/* Take device out of reset */
lpss_reset_release(base);
/* Initialize the controller */
lpss_i2c_init(bus, &config->i2c[bus]);
}
