120 static void owl_i2c_reset(struct owl_i2c_dev *i2c_dev)  in owl_i2c_reset()  argument
122 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_reset()
125 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_reset()
129 	writel(0, i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_reset()
132 static int owl_i2c_reset_fifo(struct owl_i2c_dev *i2c_dev)  in owl_i2c_reset_fifo()  argument
137 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_reset_fifo()
143 		val = readl(i2c_dev->base + OWL_I2C_REG_FIFOCTL);  in owl_i2c_reset_fifo()
150 		dev_err(&i2c_dev->adap.dev, "FIFO reset timeout\n");  in owl_i2c_reset_fifo()
157 static void owl_i2c_set_freq(struct owl_i2c_dev *i2c_dev)  in owl_i2c_set_freq()  argument
161 	val = DIV_ROUND_UP(i2c_dev->clk_rate, i2c_dev->bus_freq * 16);  in owl_i2c_set_freq()
164 	writel(OWL_I2C_DIV_FACTOR(val), i2c_dev->base + OWL_I2C_REG_CLKDIV);  in owl_i2c_set_freq()
169 	struct owl_i2c_dev *i2c_dev = _dev;  in owl_i2c_interrupt()  local
170 	struct i2c_msg *msg = i2c_dev->msg;  in owl_i2c_interrupt()
174 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_interrupt()
176 	i2c_dev->err = 0;  in owl_i2c_interrupt()
179 	fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT);  in owl_i2c_interrupt()
181 		i2c_dev->err = -ENXIO;  in owl_i2c_interrupt()
186 	stat = readl(i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_interrupt()
188 		i2c_dev->err = -EIO;  in owl_i2c_interrupt()
194 		while ((readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_interrupt()
195 			OWL_I2C_FIFOSTAT_RFE) && i2c_dev->msg_ptr < msg->len) {  in owl_i2c_interrupt()
196 			msg->buf[i2c_dev->msg_ptr++] = readl(i2c_dev->base +  in owl_i2c_interrupt()
201 		while (!(readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_interrupt()
202 			 OWL_I2C_FIFOSTAT_TFF) && i2c_dev->msg_ptr < msg->len) {  in owl_i2c_interrupt()
203 			writel(msg->buf[i2c_dev->msg_ptr++],  in owl_i2c_interrupt()
204 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_interrupt()
210 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,  in owl_i2c_interrupt()
213 	complete_all(&i2c_dev->msg_complete);  in owl_i2c_interrupt()
214 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_interrupt()
226 	struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);  in owl_i2c_check_bus_busy()  local
231 	while (readl(i2c_dev->base + OWL_I2C_REG_STAT) & OWL_I2C_STAT_BBB) {  in owl_i2c_check_bus_busy()
244 	struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);  in owl_i2c_master_xfer()  local
251 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
254 	owl_i2c_reset(i2c_dev);  in owl_i2c_master_xfer()
257 	owl_i2c_set_freq(i2c_dev);  in owl_i2c_master_xfer()
263 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
266 	ret = owl_i2c_reset_fifo(i2c_dev);  in owl_i2c_master_xfer()
275 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
278 	val = readl(i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_master_xfer()
281 		writel(val, i2c_dev->base + OWL_I2C_REG_STAT);  in owl_i2c_master_xfer()
286 	reinit_completion(&i2c_dev->msg_complete);  in owl_i2c_master_xfer()
289 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
307 		writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
312 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
321 	i2c_dev->msg = msg;  in owl_i2c_master_xfer()
322 	i2c_dev->msg_ptr = 0;  in owl_i2c_master_xfer()
325 	writel(msg->len, i2c_dev->base + OWL_I2C_REG_DATCNT);  in owl_i2c_master_xfer()
328 	writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
334 			if (readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &  in owl_i2c_master_xfer()
339 			       i2c_dev->base + OWL_I2C_REG_TXDAT);  in owl_i2c_master_xfer()
342 		i2c_dev->msg_ptr = idx;  in owl_i2c_master_xfer()
347 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_master_xfer()
350 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,  in owl_i2c_master_xfer()
354 	writel(i2c_cmd, i2c_dev->base + OWL_I2C_REG_CMD);  in owl_i2c_master_xfer()
356 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
358 	time_left = wait_for_completion_timeout(&i2c_dev->msg_complete,  in owl_i2c_master_xfer()
361 	spin_lock_irqsave(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
365 		owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
372 	ret = i2c_dev->err < 0 ? i2c_dev->err : num;  in owl_i2c_master_xfer()
375 	spin_unlock_irqrestore(&i2c_dev->lock, flags);  in owl_i2c_master_xfer()
379 	owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,  in owl_i2c_master_xfer()
401 	struct owl_i2c_dev *i2c_dev;  in owl_i2c_probe()  local
405 	i2c_dev = devm_kzalloc(dev, sizeof(*i2c_dev), GFP_KERNEL);  in owl_i2c_probe()
406 	if (!i2c_dev)  in owl_i2c_probe()
410 	i2c_dev->base = devm_ioremap_resource(dev, res);  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()
421 				 &i2c_dev->bus_freq))  in owl_i2c_probe()
422 		i2c_dev->bus_freq = OWL_I2C_DEF_SPEED_HZ;  in owl_i2c_probe()
425 	if (i2c_dev->bus_freq != OWL_I2C_DEF_SPEED_HZ &&  in owl_i2c_probe()
426 	    i2c_dev->bus_freq != OWL_I2C_MAX_SPEED_HZ) {  in owl_i2c_probe()
427 		dev_err(dev, "invalid clock-frequency %d\n", i2c_dev->bus_freq);  in owl_i2c_probe()
431 	i2c_dev->clk = devm_clk_get(dev, NULL);  in owl_i2c_probe()
432 	if (IS_ERR(i2c_dev->clk)) {  in owl_i2c_probe()
434 		return PTR_ERR(i2c_dev->clk);  in owl_i2c_probe()
437 	ret = clk_prepare_enable(i2c_dev->clk);  in owl_i2c_probe()
441 	i2c_dev->clk_rate = clk_get_rate(i2c_dev->clk);  in owl_i2c_probe()
442 	if (!i2c_dev->clk_rate) {  in owl_i2c_probe()
448 	init_completion(&i2c_dev->msg_complete);  in owl_i2c_probe()
449 	spin_lock_init(&i2c_dev->lock);  in owl_i2c_probe()
450 	i2c_dev->adap.owner = THIS_MODULE;  in owl_i2c_probe()
451 	i2c_dev->adap.algo = &owl_i2c_algorithm;  in owl_i2c_probe()
452 	i2c_dev->adap.timeout = OWL_I2C_TIMEOUT;  in owl_i2c_probe()
453 	i2c_dev->adap.quirks = &owl_i2c_quirks;  in owl_i2c_probe()
454 	i2c_dev->adap.dev.parent = dev;  in owl_i2c_probe()
455 	i2c_dev->adap.dev.of_node = dev->of_node;  in owl_i2c_probe()
456 	snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),  in owl_i2c_probe()
458 	i2c_set_adapdata(&i2c_dev->adap, i2c_dev);  in owl_i2c_probe()
460 	platform_set_drvdata(pdev, i2c_dev);  in owl_i2c_probe()
463 			       i2c_dev);  in owl_i2c_probe()
469 	return i2c_add_adapter(&i2c_dev->adap);  in owl_i2c_probe()
472 	clk_disable_unprepare(i2c_dev->clk);  in owl_i2c_probe()