3  * Intel Xe I2C attached Microcontroller Units (MCU)
12 #include <linux/i2c.h>
36  * DOC: Xe I2C devices
38  * Register a platform device for the I2C host controller (Synpsys DesignWare
39  * I2C) if the registers of that controller are mapped to the MMIO, and also the
40  * I2C client device for the Add-In Management Controller (the MCU) attached to
43  * See drivers/i2c/busses/i2c-designware-* for more information on the I2C host
50 	PROPERTY_ENTRY_STRING("compatible", "intel,xe-i2c"),
65 	struct xe_i2c *i2c = container_of(work, struct xe_i2c, work);  in xe_i2c_client_work()  local
69 		.addr	= i2c->ep.addr[1],  in xe_i2c_client_work()
72 	i2c->client[0] = i2c_new_client_device(i2c->adapter, &info);  in xe_i2c_client_work()
77 	struct xe_i2c *i2c = container_of(nb, struct xe_i2c, bus_notifier);  in xe_i2c_notifier()  local
82 	    adapter && dev->parent == &i2c->pdev->dev) {  in xe_i2c_notifier()
83 		i2c->adapter = adapter;  in xe_i2c_notifier()
84 		schedule_work(&i2c->work);  in xe_i2c_notifier()
91 static int xe_i2c_register_adapter(struct xe_i2c *i2c)  in xe_i2c_register_adapter()  argument
93 	struct pci_dev *pci = to_pci_dev(i2c->drm_dev);  in xe_i2c_register_adapter()
114 	if (i2c->adapter_irq) {  in xe_i2c_register_adapter()
117 		res = DEFINE_RES_IRQ_NAMED(i2c->adapter_irq, "xe_i2c");  in xe_i2c_register_adapter()
124 	pdev->dev.parent = i2c->drm_dev;  in xe_i2c_register_adapter()
126 	i2c->adapter_node = fwnode;  in xe_i2c_register_adapter()
127 	i2c->pdev = pdev;  in xe_i2c_register_adapter()
143 static void xe_i2c_unregister_adapter(struct xe_i2c *i2c)  in xe_i2c_unregister_adapter()  argument
145 	platform_device_unregister(i2c->pdev);  in xe_i2c_unregister_adapter()
146 	fwnode_remove_software_node(i2c->adapter_node);  in xe_i2c_unregister_adapter()
150  * xe_i2c_irq_handler: Handler for I2C interrupts
154  * Forward interrupts generated by the I2C host adapter to the I2C host adapter
159 	if (!xe->i2c || !xe->i2c->adapter_irq)  in xe_i2c_irq_handler()
163 		generic_handle_irq_safe(xe->i2c->adapter_irq);  in xe_i2c_irq_handler()
177 static int xe_i2c_create_irq(struct xe_i2c *i2c)  in xe_i2c_create_irq()  argument
181 	if (!(i2c->ep.capabilities & XE_I2C_EP_CAP_IRQ))  in xe_i2c_create_irq()
184 	domain = irq_domain_create_linear(dev_fwnode(i2c->drm_dev), 1, &xe_i2c_irq_ops, NULL);  in xe_i2c_create_irq()
188 	i2c->adapter_irq = irq_create_mapping(domain, 0);  in xe_i2c_create_irq()
189 	i2c->irqdomain = domain;  in xe_i2c_create_irq()
194 static void xe_i2c_remove_irq(struct xe_i2c *i2c)  in xe_i2c_remove_irq()  argument
196 	if (!i2c->irqdomain)  in xe_i2c_remove_irq()
199 	irq_dispose_mapping(i2c->adapter_irq);  in xe_i2c_remove_irq()
200 	irq_domain_remove(i2c->irqdomain);  in xe_i2c_remove_irq()
205 	struct xe_i2c *i2c = context;  in xe_i2c_read()  local
207 	*val = xe_mmio_read32(i2c->mmio, XE_REG(reg + I2C_MEM_SPACE_OFFSET));  in xe_i2c_read()
214 	struct xe_i2c *i2c = context;  in xe_i2c_write()  local
216 	xe_mmio_write32(i2c->mmio, XE_REG(reg + I2C_MEM_SPACE_OFFSET), val);  in xe_i2c_write()
233 	if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)  in xe_i2c_pm_suspend()
244 	if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)  in xe_i2c_pm_resume()
256 	struct xe_i2c *i2c = data;  in xe_i2c_remove()  local
260 		i2c_unregister_device(i2c->client[i]);  in xe_i2c_remove()
262 	bus_unregister_notifier(&i2c_bus_type, &i2c->bus_notifier);  in xe_i2c_remove()
263 	xe_i2c_unregister_adapter(i2c);  in xe_i2c_remove()
264 	xe_i2c_remove_irq(i2c);  in xe_i2c_remove()
268  * xe_i2c_probe: Probe the I2C host adapter and the I2C clients attached to it
271  * Register all the I2C devices described in the I2C Endpoint data structure.
280 	struct xe_i2c *i2c;  in xe_i2c_probe()  local
293 	i2c = devm_kzalloc(drm_dev, sizeof(*i2c), GFP_KERNEL);  in xe_i2c_probe()
294 	if (!i2c)  in xe_i2c_probe()
297 	INIT_WORK(&i2c->work, xe_i2c_client_work);  in xe_i2c_probe()
298 	i2c->mmio = xe_root_tile_mmio(xe);  in xe_i2c_probe()
299 	i2c->drm_dev = drm_dev;  in xe_i2c_probe()
300 	i2c->ep = ep;  in xe_i2c_probe()
301 	xe->i2c = i2c;  in xe_i2c_probe()
306 	regmap = devm_regmap_init(drm_dev, NULL, i2c, &i2c_regmap_config);  in xe_i2c_probe()
310 	i2c->bus_notifier.notifier_call = xe_i2c_notifier;  in xe_i2c_probe()
311 	ret = bus_register_notifier(&i2c_bus_type, &i2c->bus_notifier);  in xe_i2c_probe()
315 	ret = xe_i2c_create_irq(i2c);  in xe_i2c_probe()
319 	ret = xe_i2c_register_adapter(i2c);  in xe_i2c_probe()
323 	return devm_add_action_or_reset(drm_dev, xe_i2c_remove, i2c);  in xe_i2c_probe()
326 	xe_i2c_remove_irq(i2c);  in xe_i2c_probe()
329 	bus_unregister_notifier(&i2c_bus_type, &i2c->bus_notifier);  in xe_i2c_probe()