117 static void owl_i2c_reset(struct owl_i2c_dev *i2c_dev)  in owl_i2c_reset()  argument
119 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_reset()
122 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_reset()
126 	writel(0, i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_reset()
129 static int owl_i2c_reset_fifo(struct owl_i2c_dev *i2c_dev)  in owl_i2c_reset_fifo()  argument
134 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_reset_fifo()
140 		val = readl(i2c_dev->base + OWL_I2C_REG_FIFOCTL);  in owl_i2c_reset_fifo()
147 		dev_err(&i2c_dev->adap.dev, "FIFO reset timeout\n");  in owl_i2c_reset_fifo()
154 static void owl_i2c_set_freq(struct owl_i2c_dev *i2c_dev)  in owl_i2c_set_freq()  argument
158 	val = DIV_ROUND_UP(i2c_dev->clk_rate, i2c_dev->bus_freq * 16);  in owl_i2c_set_freq()
161 	writel(OWL_I2C_DIV_FACTOR(val), i2c_dev->base + OWL_I2C_REG_CLKDIV);  in owl_i2c_set_freq()
166 	struct owl_i2c_dev *i2c_dev = _dev;  in owl_i2c_interrupt()  local
167 	struct i2c_msg *msg = i2c_dev->msg;  in owl_i2c_interrupt()
170 	spin_lock(&i2c_dev->lock);  in owl_i2c_interrupt()
172 	i2c_dev->err = 0;  in owl_i2c_interrupt()
175 	fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT);  in owl_i2c_interrupt()
177 		i2c_dev->err = -ENXIO;  in owl_i2c_interrupt()
179 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOSTAT,  in owl_i2c_interrupt()
185 	stat = readl(i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_interrupt()
187 		i2c_dev->err = -EIO;  in owl_i2c_interrupt()
189 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,  in owl_i2c_interrupt()
196 		while ((readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_interrupt()
197 			OWL_I2C_FIFOSTAT_RFE) && i2c_dev->msg_ptr < msg->len) {  in owl_i2c_interrupt()
198 			msg->buf[i2c_dev->msg_ptr++] = readl(i2c_dev->base +  in owl_i2c_interrupt()
203 		while (!(readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_interrupt()
204 			 OWL_I2C_FIFOSTAT_TFF) && i2c_dev->msg_ptr < msg->len) {  in owl_i2c_interrupt()
205 			writel(msg->buf[i2c_dev->msg_ptr++],  in owl_i2c_interrupt()
206 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_interrupt()
212 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,  in owl_i2c_interrupt()
215 	complete_all(&i2c_dev->msg_complete);  in owl_i2c_interrupt()
216 	spin_unlock(&i2c_dev->lock);  in owl_i2c_interrupt()
228 	struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);  in owl_i2c_check_bus_busy()  local
233 	while (readl(i2c_dev->base + OWL_I2C_REG_STAT) & OWL_I2C_STAT_BBB) {  in owl_i2c_check_bus_busy()
246 	struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);  in owl_i2c_master_xfer()  local
253 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
256 	owl_i2c_reset(i2c_dev);  in owl_i2c_master_xfer()
259 	owl_i2c_set_freq(i2c_dev);  in owl_i2c_master_xfer()
265 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
268 	ret = owl_i2c_reset_fifo(i2c_dev);  in owl_i2c_master_xfer()
277 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
280 	val = readl(i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_master_xfer()
283 		writel(val, i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_master_xfer()
288 	reinit_completion(&i2c_dev->msg_complete);  in owl_i2c_master_xfer()
291 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
309 		writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
314 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
323 	i2c_dev->msg = msg;  in owl_i2c_master_xfer()
324 	i2c_dev->msg_ptr = 0;  in owl_i2c_master_xfer()
327 	writel(msg->len, i2c_dev->base + OWL_I2C_REG_DATCNT);  in owl_i2c_master_xfer()
330 	writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
336 			if (readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_master_xfer()
341 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
344 		i2c_dev->msg_ptr = idx;  in owl_i2c_master_xfer()
349 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_master_xfer()
352 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_master_xfer()
356 	writel(i2c_cmd, i2c_dev->base + OWL_I2C_REG_CMD);  in owl_i2c_master_xfer()
358 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
360 	time_left = wait_for_completion_timeout(&i2c_dev->msg_complete,  in owl_i2c_master_xfer()
363 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
367 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
374 	ret = i2c_dev->err < 0 ? i2c_dev->err : num;  in owl_i2c_master_xfer()
377 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
381 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
403 	struct owl_i2c_dev *i2c_dev;  in owl_i2c_probe()  local
406 	i2c_dev = devm_kzalloc(dev, sizeof(*i2c_dev), GFP_KERNEL);  in owl_i2c_probe()
407 	if (!i2c_dev)  in owl_i2c_probe()
410 	i2c_dev->base = devm_platform_ioremap_resource(pdev, 0);  in owl_i2c_probe()
411 	if (IS_ERR(i2c_dev->base))  in owl_i2c_probe()
412 		return PTR_ERR(i2c_dev->base);  in owl_i2c_probe()
419 				 &i2c_dev->bus_freq))  in owl_i2c_probe()
420 		i2c_dev->bus_freq = I2C_MAX_STANDARD_MODE_FREQ;  in owl_i2c_probe()
423 	if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&  in owl_i2c_probe()
424 	    i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ) {  in owl_i2c_probe()
425 		dev_err(dev, "invalid clock-frequency %d\n", i2c_dev->bus_freq);  in owl_i2c_probe()
429 	i2c_dev->clk = devm_clk_get(dev, NULL);  in owl_i2c_probe()
430 	if (IS_ERR(i2c_dev->clk)) {  in owl_i2c_probe()
432 		return PTR_ERR(i2c_dev->clk);  in owl_i2c_probe()
435 	ret = clk_prepare_enable(i2c_dev->clk);  in owl_i2c_probe()
439 	i2c_dev->clk_rate = clk_get_rate(i2c_dev->clk);  in owl_i2c_probe()
440 	if (!i2c_dev->clk_rate) {  in owl_i2c_probe()
446 	init_completion(&i2c_dev->msg_complete);  in owl_i2c_probe()
447 	spin_lock_init(&i2c_dev->lock);  in owl_i2c_probe()
448 	i2c_dev->adap.owner = THIS_MODULE;  in owl_i2c_probe()
449 	i2c_dev->adap.algo = &owl_i2c_algorithm;  in owl_i2c_probe()
450 	i2c_dev->adap.timeout = OWL_I2C_TIMEOUT;  in owl_i2c_probe()
451 	i2c_dev->adap.quirks = &owl_i2c_quirks;  in owl_i2c_probe()
452 	i2c_dev->adap.dev.parent = dev;  in owl_i2c_probe()
453 	i2c_dev->adap.dev.of_node = dev->of_node;  in owl_i2c_probe()
454 	snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),  in owl_i2c_probe()
456 	i2c_set_adapdata(&i2c_dev->adap, i2c_dev);  in owl_i2c_probe()
458 	platform_set_drvdata(pdev, i2c_dev);  in owl_i2c_probe()
461 			       i2c_dev);  in owl_i2c_probe()
467 	return i2c_add_adapter(&i2c_dev->adap);  in owl_i2c_probe()
470 	clk_disable_unprepare(i2c_dev->clk);  in owl_i2c_probe()