C++ (Cpp) dw_i2c_init Examples

Example #1

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;
}

Example #2

static void dw_i2c_soc_init(bool is_early_init)
{
	size_t i;
	const struct soc_amd_stoneyridge_config *config;

	config = get_soc_config();

	if (config == NULL)
		return;

	for (i = 0; i < ARRAY_SIZE(config->i2c); i++) {
		const struct dw_i2c_bus_config *cfg  = &config->i2c[i];

		if (cfg->early_init != is_early_init)
			continue;

		if (dw_i2c_init(i, cfg))
			printk(BIOS_ERR, "Failed to init i2c bus %zd\n", i);
	}
}