1 // SPDX-License-Identifier: GPL-2.0
3  *  i2c Support for Atmel's AT91 Two-Wire Interface (TWI)
18 #include <linux/i2c.h>
27 #include "i2c-at91.h"
31 	return readl_relaxed(dev->base + reg);  in at91_twi_read()
36 	writel_relaxed(val, dev->base + reg);  in at91_twi_write()
46 	dev->imr = at91_twi_read(dev, AT91_TWI_IMR) & AT91_TWI_INT_MASK;  in at91_twi_irq_save()
52 	at91_twi_write(dev, AT91_TWI_IER, dev->imr);  in at91_twi_irq_restore()
59 	if (dev->slave_detected)  in at91_init_twi_bus()
93 		.name = "i2c-at91rm9200",
96 		.name = "i2c-at91sam9261",
99 		.name = "i2c-at91sam9260",
102 		.name = "i2c-at91sam9g20",
105 		.name = "i2c-at91sam9g10",
151 		.compatible = "atmel,at91rm9200-i2c",
154 		.compatible = "atmel,at91sam9260-i2c",
157 		.compatible = "atmel,at91sam9261-i2c",
160 		.compatible = "atmel,at91sam9g20-i2c",
163 		.compatible = "atmel,at91sam9g10-i2c",
166 		.compatible = "atmel,at91sam9x5-i2c",
169 		.compatible = "atmel,sama5d4-i2c",
172 		.compatible = "atmel,sama5d2-i2c",
175 		.compatible = "microchip,sam9x60-i2c",
187 	if (pdev->dev.of_node) {  in at91_twi_get_driver_data()
189 		match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);  in at91_twi_get_driver_data()
192 		return (struct at91_twi_pdata *)match->data;  in at91_twi_get_driver_data()
194 	return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;  in at91_twi_get_driver_data()
204 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);  in at91_twi_probe()
206 		return -ENOMEM;  in at91_twi_probe()
208 	dev->dev = &pdev->dev;  in at91_twi_probe()
212 		return -ENODEV;  in at91_twi_probe()
213 	phy_addr = mem->start;  in at91_twi_probe()
215 	dev->pdata = at91_twi_get_driver_data(pdev);  in at91_twi_probe()
216 	if (!dev->pdata)  in at91_twi_probe()
217 		return -ENODEV;  in at91_twi_probe()
219 	dev->base = devm_ioremap_resource(&pdev->dev, mem);  in at91_twi_probe()
220 	if (IS_ERR(dev->base))  in at91_twi_probe()
221 		return PTR_ERR(dev->base);  in at91_twi_probe()
223 	dev->irq = platform_get_irq(pdev, 0);  in at91_twi_probe()
224 	if (dev->irq < 0)  in at91_twi_probe()
225 		return dev->irq;  in at91_twi_probe()
229 	dev->clk = devm_clk_get(dev->dev, NULL);  in at91_twi_probe()
230 	if (IS_ERR(dev->clk)) {  in at91_twi_probe()
231 		dev_err(dev->dev, "no clock defined\n");  in at91_twi_probe()
232 		return -ENODEV;  in at91_twi_probe()
234 	clk_prepare_enable(dev->clk);  in at91_twi_probe()
236 	snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");  in at91_twi_probe()
237 	i2c_set_adapdata(&dev->adapter, dev);  in at91_twi_probe()
238 	dev->adapter.owner = THIS_MODULE;  in at91_twi_probe()
239 	dev->adapter.class = I2C_CLASS_DEPRECATED;  in at91_twi_probe()
240 	dev->adapter.dev.parent = dev->dev;  in at91_twi_probe()
241 	dev->adapter.nr = pdev->id;  in at91_twi_probe()
242 	dev->adapter.timeout = AT91_I2C_TIMEOUT;  in at91_twi_probe()
243 	dev->adapter.dev.of_node = pdev->dev.of_node;  in at91_twi_probe()
245 	dev->slave_detected = i2c_detect_slave_mode(&pdev->dev);  in at91_twi_probe()
247 	if (dev->slave_detected)  in at91_twi_probe()
256 	pm_runtime_set_autosuspend_delay(dev->dev, AUTOSUSPEND_TIMEOUT);  in at91_twi_probe()
257 	pm_runtime_use_autosuspend(dev->dev);  in at91_twi_probe()
258 	pm_runtime_set_active(dev->dev);  in at91_twi_probe()
259 	pm_runtime_enable(dev->dev);  in at91_twi_probe()
261 	rc = i2c_add_numbered_adapter(&dev->adapter);  in at91_twi_probe()
263 		clk_disable_unprepare(dev->clk);  in at91_twi_probe()
265 		pm_runtime_disable(dev->dev);  in at91_twi_probe()
266 		pm_runtime_set_suspended(dev->dev);  in at91_twi_probe()
271 	dev_info(dev->dev, "AT91 i2c bus driver (hw version: %#x).\n",  in at91_twi_probe()
280 	i2c_del_adapter(&dev->adapter);  in at91_twi_remove()
281 	clk_disable_unprepare(dev->clk);  in at91_twi_remove()
283 	pm_runtime_disable(dev->dev);  in at91_twi_remove()
284 	pm_runtime_set_suspended(dev->dev);  in at91_twi_remove()
293 	clk_disable_unprepare(twi_dev->clk);  in at91_twi_runtime_suspend()
306 	return clk_prepare_enable(twi_dev->clk);  in at91_twi_runtime_resume()
368 MODULE_DESCRIPTION("I2C (TWI) driver for Atmel AT91");