1 // SPDX-License-Identifier: GPL-2.0-or-later
56 	complete(&priv->comp);  in uniphier_i2c_interrupt()
68 	reinit_completion(&priv->comp);  in uniphier_i2c_xfer_byte()
71 	writel(txdata, priv->membase + UNIPHIER_I2C_DTRM);  in uniphier_i2c_xfer_byte()
73 	time_left = wait_for_completion_timeout(&priv->comp, adap->timeout);  in uniphier_i2c_xfer_byte()
75 		dev_err(&adap->dev, "transaction timeout\n");  in uniphier_i2c_xfer_byte()
76 		return -ETIMEDOUT;  in uniphier_i2c_xfer_byte()
79 	rxdata = readl(priv->membase + UNIPHIER_I2C_DREC);  in uniphier_i2c_xfer_byte()
96 		return -EAGAIN;  in uniphier_i2c_send_byte()
99 		return -ENXIO;  in uniphier_i2c_send_byte()
115 	while (len--) {  in uniphier_i2c_tx()
137 	while (len--) {  in uniphier_i2c_rx()
160 	bool is_read = msg->flags & I2C_M_RD;  in uniphier_i2c_master_xfer_one()
161 	bool recovery = false;  in uniphier_i2c_master_xfer_one()  local
165 		ret = uniphier_i2c_rx(adap, msg->addr, msg->len, msg->buf);  in uniphier_i2c_master_xfer_one()
167 		ret = uniphier_i2c_tx(adap, msg->addr, msg->len, msg->buf);  in uniphier_i2c_master_xfer_one()
169 	if (ret == -EAGAIN) /* could not acquire bus. bail out without STOP */  in uniphier_i2c_master_xfer_one()
172 	if (ret == -ETIMEDOUT) {  in uniphier_i2c_master_xfer_one()
173 		/* This error is fatal.  Needs recovery. */  in uniphier_i2c_master_xfer_one()
175 		recovery = true;  in uniphier_i2c_master_xfer_one()
182 			/* Failed to issue STOP.  The bus needs recovery. */  in uniphier_i2c_master_xfer_one()
183 			recovery = true;  in uniphier_i2c_master_xfer_one()
188 	if (recovery)  in uniphier_i2c_master_xfer_one()
198 	if (!(readl(priv->membase + UNIPHIER_I2C_DREC) &  in uniphier_i2c_check_bus_busy()
200 		if (priv->busy_cnt++ > 3) {  in uniphier_i2c_check_bus_busy()
203 			 * in a wrong state.  Try bus recovery.  in uniphier_i2c_check_bus_busy()
206 			priv->busy_cnt = 0;  in uniphier_i2c_check_bus_busy()
209 		return -EAGAIN;  in uniphier_i2c_check_bus_busy()
212 	priv->busy_cnt = 0;  in uniphier_i2c_check_bus_busy()
228 		bool stop = (msg + 1 == emsg) || (msg->flags & I2C_M_STOP);  in uniphier_i2c_master_xfer()
253 	writel(val, priv->membase + UNIPHIER_I2C_BRST);  in uniphier_i2c_reset()
260 	return !!(readl(priv->membase + UNIPHIER_I2C_BSTS) &  in uniphier_i2c_get_scl()
269 	       priv->membase + UNIPHIER_I2C_BRST);  in uniphier_i2c_set_scl()
276 	return !!(readl(priv->membase + UNIPHIER_I2C_BSTS) &  in uniphier_i2c_get_sda()
295 	unsigned int cyc = priv->clk_cycle;  in uniphier_i2c_hw_init()
300 	 * Bit30-16: clock cycles of tLOW.  in uniphier_i2c_hw_init()
301 	 *  Standard-mode: tLOW = 4.7 us, tHIGH = 4.0 us  in uniphier_i2c_hw_init()
302 	 *  Fast-mode:     tLOW = 1.3 us, tHIGH = 0.6 us  in uniphier_i2c_hw_init()
305 	writel((cyc * 5 / 9 << 16) | cyc, priv->membase + UNIPHIER_I2C_CLK);  in uniphier_i2c_hw_init()
312 	struct device *dev = &pdev->dev;  in uniphier_i2c_probe()
320 		return -ENOMEM;  in uniphier_i2c_probe()
322 	priv->membase = devm_platform_ioremap_resource(pdev, 0);  in uniphier_i2c_probe()
323 	if (IS_ERR(priv->membase))  in uniphier_i2c_probe()
324 		return PTR_ERR(priv->membase);  in uniphier_i2c_probe()
330 	if (of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed))  in uniphier_i2c_probe()
334 		dev_err(dev, "invalid clock-frequency %d\n", bus_speed);  in uniphier_i2c_probe()
335 		return -EINVAL;  in uniphier_i2c_probe()
338 	priv->clk = devm_clk_get(dev, NULL);  in uniphier_i2c_probe()
339 	if (IS_ERR(priv->clk)) {  in uniphier_i2c_probe()
341 		return PTR_ERR(priv->clk);  in uniphier_i2c_probe()
344 	ret = clk_prepare_enable(priv->clk);  in uniphier_i2c_probe()
348 	clk_rate = clk_get_rate(priv->clk);  in uniphier_i2c_probe()
351 		ret = -EINVAL;  in uniphier_i2c_probe()
355 	priv->clk_cycle = clk_rate / bus_speed;  in uniphier_i2c_probe()
356 	init_completion(&priv->comp);  in uniphier_i2c_probe()
357 	priv->adap.owner = THIS_MODULE;  in uniphier_i2c_probe()
358 	priv->adap.algo = &uniphier_i2c_algo;  in uniphier_i2c_probe()
359 	priv->adap.dev.parent = dev;  in uniphier_i2c_probe()
360 	priv->adap.dev.of_node = dev->of_node;  in uniphier_i2c_probe()
361 	strscpy(priv->adap.name, "UniPhier I2C", sizeof(priv->adap.name));  in uniphier_i2c_probe()
362 	priv->adap.bus_recovery_info = &uniphier_i2c_bus_recovery_info;  in uniphier_i2c_probe()
363 	i2c_set_adapdata(&priv->adap, priv);  in uniphier_i2c_probe()
368 	ret = devm_request_irq(dev, irq, uniphier_i2c_interrupt, 0, pdev->name,  in uniphier_i2c_probe()
375 	ret = i2c_add_adapter(&priv->adap);  in uniphier_i2c_probe()
378 		clk_disable_unprepare(priv->clk);  in uniphier_i2c_probe()
387 	i2c_del_adapter(&priv->adap);  in uniphier_i2c_remove()
388 	clk_disable_unprepare(priv->clk);  in uniphier_i2c_remove()
397 	clk_disable_unprepare(priv->clk);  in uniphier_i2c_suspend()
407 	ret = clk_prepare_enable(priv->clk);  in uniphier_i2c_resume()
421 	{ .compatible = "socionext,uniphier-i2c" },
430 		.name  = "uniphier-i2c",