1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Synopsys DesignWare I2C adapter driver.
5  * Based on the TI DAVINCI I2C adapter driver.
11 #include <linux/clk-provider.h>
17 #include <linux/i2c.h>
33 #include "i2c-designware-core.h"
37 	return clk_get_rate(dev->clk) / KILO;  in i2c_dw_get_clk_rate_khz()
57 	ret = regmap_write(dev->sysmap, BT1_I2C_CTL,  in bt1_i2c_read()
62 	return regmap_read(dev->sysmap, BT1_I2C_DO, val);  in bt1_i2c_read()
70 	ret = regmap_write(dev->sysmap, BT1_I2C_DI, val);  in bt1_i2c_write()
74 	return regmap_write(dev->sysmap, BT1_I2C_CTL,  in bt1_i2c_write()
90 	dev->sysmap = syscon_node_to_regmap(dev->dev->of_node->parent);  in bt1_i2c_request_regs()
91 	if (IS_ERR(dev->sysmap))  in bt1_i2c_request_regs()
92 		return PTR_ERR(dev->sysmap);  in bt1_i2c_request_regs()
94 	dev->map = devm_regmap_init(dev->dev, NULL, dev, &bt1_i2c_cfg);  in bt1_i2c_request_regs()
95 	return PTR_ERR_OR_ZERO(dev->map);  in bt1_i2c_request_regs()
100 	return -ENODEV;  in bt1_i2c_request_regs()
106 	dev->map = dev_get_regmap(dev->dev->parent, NULL);  in txgbe_i2c_request_regs()
107 	if (!dev->map)  in txgbe_i2c_request_regs()
108 		return -ENODEV;  in txgbe_i2c_request_regs()
115 	pm_runtime_disable(dev->dev);  in dw_i2c_plat_pm_cleanup()
117 	if (dev->shared_with_punit)  in dw_i2c_plat_pm_cleanup()
118 		pm_runtime_put_noidle(dev->dev);  in dw_i2c_plat_pm_cleanup()
123 	struct platform_device *pdev = to_platform_device(dev->dev);  in dw_i2c_plat_request_regs()
126 	switch (dev->flags & MODEL_MASK) {  in dw_i2c_plat_request_regs()
134 		dev->base = devm_platform_ioremap_resource(pdev, 0);  in dw_i2c_plat_request_regs()
135 		ret = PTR_ERR_OR_ZERO(dev->base);  in dw_i2c_plat_request_regs()
173 	dev->semaphore_idx = -1;  in i2c_dw_probe_lock_support()
175 	for (ptr = i2c_dw_semaphore_cb_table; ptr->probe; ptr++) {  in i2c_dw_probe_lock_support()
176 		ret = ptr->probe(dev);  in i2c_dw_probe_lock_support()
183 			if (ret != -ENODEV)  in i2c_dw_probe_lock_support()
190 		dev->semaphore_idx = i;  in i2c_dw_probe_lock_support()
199 	if (dev->semaphore_idx < 0)  in i2c_dw_remove_lock_support()
202 	if (i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove)  in i2c_dw_remove_lock_support()
203 		i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove(dev);  in i2c_dw_remove_lock_support()
208 	struct device *device = &pdev->dev;  in dw_i2c_plat_probe()
219 		return -ENOMEM;  in dw_i2c_plat_probe()
221 	dev->flags = (uintptr_t)device_get_match_data(device);  in dw_i2c_plat_probe()
222 	if (device_property_present(device, "wx,i2c-snps-model"))  in dw_i2c_plat_probe()
223 		dev->flags = MODEL_WANGXUN_SP | ACCESS_POLLING;  in dw_i2c_plat_probe()
225 	dev->dev = device;  in dw_i2c_plat_probe()
226 	dev->irq = irq;  in dw_i2c_plat_probe()
233 	dev->rst = devm_reset_control_get_optional_exclusive(device, NULL);  in dw_i2c_plat_probe()
234 	if (IS_ERR(dev->rst))  in dw_i2c_plat_probe()
235 		return PTR_ERR(dev->rst);  in dw_i2c_plat_probe()
237 	reset_control_deassert(dev->rst);  in dw_i2c_plat_probe()
250 	dev->pclk = devm_clk_get_optional(device, "pclk");  in dw_i2c_plat_probe()
251 	if (IS_ERR(dev->pclk)) {  in dw_i2c_plat_probe()
252 		ret = PTR_ERR(dev->pclk);  in dw_i2c_plat_probe()
256 	dev->clk = devm_clk_get_optional(device, NULL);  in dw_i2c_plat_probe()
257 	if (IS_ERR(dev->clk)) {  in dw_i2c_plat_probe()
258 		ret = PTR_ERR(dev->clk);  in dw_i2c_plat_probe()
266 	if (dev->clk) {  in dw_i2c_plat_probe()
267 		struct i2c_timings *t = &dev->timings;  in dw_i2c_plat_probe()
270 		dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;  in dw_i2c_plat_probe()
271 		clk_khz = dev->get_clk_rate_khz(dev);  in dw_i2c_plat_probe()
273 		if (!dev->sda_hold_time && t->sda_hold_ns)  in dw_i2c_plat_probe()
274 			dev->sda_hold_time =  in dw_i2c_plat_probe()
275 				DIV_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);  in dw_i2c_plat_probe()
278 	adap = &dev->adapter;  in dw_i2c_plat_probe()
279 	adap->owner = THIS_MODULE;  in dw_i2c_plat_probe()
280 	adap->class = dmi_check_system(dw_i2c_hwmon_class_dmi) ?  in dw_i2c_plat_probe()
282 	adap->nr = -1;  in dw_i2c_plat_probe()
284 	if (dev->flags & ACCESS_NO_IRQ_SUSPEND)  in dw_i2c_plat_probe()
298 	if (dev->shared_with_punit)  in dw_i2c_plat_probe()
312 	reset_control_assert(dev->rst);  in dw_i2c_plat_probe()
319 	struct device *device = &pdev->dev;  in dw_i2c_plat_remove()
323 	i2c_del_adapter(&dev->adapter);  in dw_i2c_plat_remove()
333 	reset_control_assert(dev->rst);  in dw_i2c_plat_remove()
337 	{ .compatible = "snps,designware-i2c", },
338 	{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
339 	{ .compatible = "baikal,bt1-sys-i2c", .data = (void *)MODEL_BAIKAL_BT1 },
398 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");