1 // SPDX-License-Identifier: GPL-2.0-only
4 #include <linux/i2c.h>
5 #include <linux/i2c-mux.h>
21 	struct rtl9300_i2c *i2c;  member
63 static int rtl9300_i2c_reg_addr_set(struct rtl9300_i2c *i2c, u32 reg, u16 len)  in rtl9300_i2c_reg_addr_set()  argument
71 	ret = regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL2, mask, val);  in rtl9300_i2c_reg_addr_set()
78 	return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val);  in rtl9300_i2c_reg_addr_set()
81 static int rtl9300_i2c_config_io(struct rtl9300_i2c *i2c, u8 sda_pin)  in rtl9300_i2c_config_io()  argument
86 	ret = regmap_update_bits(i2c->regmap, RTL9300_I2C_MST_GLB_CTRL, BIT(sda_pin), BIT(sda_pin));  in rtl9300_i2c_config_io()
94 	return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val);  in rtl9300_i2c_config_io()
97 static int rtl9300_i2c_config_xfer(struct rtl9300_i2c *i2c, struct rtl9300_i2c_chan *chan,  in rtl9300_i2c_config_xfer()  argument
102 	val = chan->bus_freq << RTL9300_I2C_MST_CTRL2_SCL_FREQ_OFS;  in rtl9300_i2c_config_xfer()
108 	val |= ((len - 1) & 0xf) << RTL9300_I2C_MST_CTRL2_DATA_WIDTH_OFS;  in rtl9300_i2c_config_xfer()
113 	return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL2, mask, val);  in rtl9300_i2c_config_xfer()
116 static int rtl9300_i2c_read(struct rtl9300_i2c *i2c, u8 *buf, int len)  in rtl9300_i2c_read()  argument
122 		return -EIO;  in rtl9300_i2c_read()
124 	ret = regmap_bulk_read(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0,  in rtl9300_i2c_read()
137 static int rtl9300_i2c_write(struct rtl9300_i2c *i2c, u8 *buf, int len)  in rtl9300_i2c_write()  argument
143 		return -EIO;  in rtl9300_i2c_write()
152 	return regmap_bulk_write(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0,  in rtl9300_i2c_write()
156 static int rtl9300_i2c_writel(struct rtl9300_i2c *i2c, u32 data)  in rtl9300_i2c_writel()  argument
158 	return regmap_write(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, data);  in rtl9300_i2c_writel()
161 static int rtl9300_i2c_execute_xfer(struct rtl9300_i2c *i2c, char read_write,  in rtl9300_i2c_execute_xfer()  argument
173 	ret = regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val);  in rtl9300_i2c_execute_xfer()
177 	ret = regmap_read_poll_timeout(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1,  in rtl9300_i2c_execute_xfer()
183 		return -EIO;  in rtl9300_i2c_execute_xfer()
187 			ret = regmap_read(i2c->regmap,  in rtl9300_i2c_execute_xfer()
188 					  i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, &val);  in rtl9300_i2c_execute_xfer()
191 			data->byte = val & 0xff;  in rtl9300_i2c_execute_xfer()
193 			ret = regmap_read(i2c->regmap,  in rtl9300_i2c_execute_xfer()
194 					  i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, &val);  in rtl9300_i2c_execute_xfer()
197 			data->word = val & 0xffff;  in rtl9300_i2c_execute_xfer()
199 			ret = rtl9300_i2c_read(i2c, &data->block[0], len);  in rtl9300_i2c_execute_xfer()
213 	struct rtl9300_i2c *i2c = chan->i2c;  in rtl9300_i2c_smbus_xfer()  local
216 	mutex_lock(&i2c->lock);  in rtl9300_i2c_smbus_xfer()
217 	if (chan->sda_pin != i2c->sda_pin) {  in rtl9300_i2c_smbus_xfer()
218 		ret = rtl9300_i2c_config_io(i2c, chan->sda_pin);  in rtl9300_i2c_smbus_xfer()
221 		i2c->sda_pin = chan->sda_pin;  in rtl9300_i2c_smbus_xfer()
226 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0);  in rtl9300_i2c_smbus_xfer()
229 		ret = rtl9300_i2c_reg_addr_set(i2c, 0, 0);  in rtl9300_i2c_smbus_xfer()
236 			ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0);  in rtl9300_i2c_smbus_xfer()
239 			ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);  in rtl9300_i2c_smbus_xfer()
243 			ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 1);  in rtl9300_i2c_smbus_xfer()
246 			ret = rtl9300_i2c_reg_addr_set(i2c, 0, 0);  in rtl9300_i2c_smbus_xfer()
253 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);  in rtl9300_i2c_smbus_xfer()
256 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 1);  in rtl9300_i2c_smbus_xfer()
260 			ret = rtl9300_i2c_writel(i2c, data->byte);  in rtl9300_i2c_smbus_xfer()
267 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);  in rtl9300_i2c_smbus_xfer()
270 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 2);  in rtl9300_i2c_smbus_xfer()
274 			ret = rtl9300_i2c_writel(i2c, data->word);  in rtl9300_i2c_smbus_xfer()
281 		ret = rtl9300_i2c_reg_addr_set(i2c, command, 1);  in rtl9300_i2c_smbus_xfer()
284 		ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0]);  in rtl9300_i2c_smbus_xfer()
288 			ret = rtl9300_i2c_write(i2c, &data->block[1], data->block[0]);  in rtl9300_i2c_smbus_xfer()
292 		len = data->block[0];  in rtl9300_i2c_smbus_xfer()
296 		dev_err(&adap->dev, "Unsupported transaction %d\n", size);  in rtl9300_i2c_smbus_xfer()
297 		ret = -EOPNOTSUPP;  in rtl9300_i2c_smbus_xfer()
301 	ret = rtl9300_i2c_execute_xfer(i2c, read_write, size, data, len);  in rtl9300_i2c_smbus_xfer()
304 	mutex_unlock(&i2c->lock);  in rtl9300_i2c_smbus_xfer()
329 	struct device *dev = &pdev->dev;  in rtl9300_i2c_probe()
330 	struct rtl9300_i2c *i2c;  in rtl9300_i2c_probe()  local
335 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);  in rtl9300_i2c_probe()
336 	if (!i2c)  in rtl9300_i2c_probe()
337 		return -ENOMEM;  in rtl9300_i2c_probe()
339 	i2c->regmap = syscon_node_to_regmap(dev->parent->of_node);  in rtl9300_i2c_probe()
340 	if (IS_ERR(i2c->regmap))  in rtl9300_i2c_probe()
341 		return PTR_ERR(i2c->regmap);  in rtl9300_i2c_probe()
342 	i2c->dev = dev;  in rtl9300_i2c_probe()
344 	mutex_init(&i2c->lock);  in rtl9300_i2c_probe()
346 	ret = device_property_read_u32(dev, "reg", &i2c->reg_base);  in rtl9300_i2c_probe()
350 	platform_set_drvdata(pdev, i2c);  in rtl9300_i2c_probe()
353 		return dev_err_probe(dev, -EINVAL, "Too many channels\n");  in rtl9300_i2c_probe()
356 		struct rtl9300_i2c_chan *chan = &i2c->chans[i];  in rtl9300_i2c_probe()
357 		struct i2c_adapter *adap = &chan->adap;  in rtl9300_i2c_probe()
363 		ret = fwnode_property_read_u32(child, "clock-frequency", &clock_freq);  in rtl9300_i2c_probe()
369 			chan->bus_freq = RTL9300_I2C_STD_FREQ;  in rtl9300_i2c_probe()
373 			chan->bus_freq = RTL9300_I2C_FAST_FREQ;  in rtl9300_i2c_probe()
376 			dev_warn(i2c->dev, "SDA%d clock-frequency %d not supported using default\n",  in rtl9300_i2c_probe()
381 		chan->sda_pin = sda_pin;  in rtl9300_i2c_probe()
382 		chan->i2c = i2c;  in rtl9300_i2c_probe()
383 		adap = &i2c->chans[i].adap;  in rtl9300_i2c_probe()
384 		adap->owner = THIS_MODULE;  in rtl9300_i2c_probe()
385 		adap->algo = &rtl9300_i2c_algo;  in rtl9300_i2c_probe()
386 		adap->quirks = &rtl9300_i2c_quirks;  in rtl9300_i2c_probe()
387 		adap->retries = 3;  in rtl9300_i2c_probe()
388 		adap->dev.parent = dev;  in rtl9300_i2c_probe()
390 		adap->dev.of_node = to_of_node(child);  in rtl9300_i2c_probe()
391 		snprintf(adap->name, sizeof(adap->name), "%s SDA%d\n", dev_name(dev), sda_pin);  in rtl9300_i2c_probe()
398 	i2c->sda_pin = 0xff;  in rtl9300_i2c_probe()
404 	{ .compatible = "realtek,rtl9301-i2c" },
405 	{ .compatible = "realtek,rtl9302b-i2c" },
406 	{ .compatible = "realtek,rtl9302c-i2c" },
407 	{ .compatible = "realtek,rtl9303-i2c" },
415 		.name = "i2c-rtl9300",
422 MODULE_DESCRIPTION("RTL9300 I2C controller driver");