1 // SPDX-License-Identifier: GPL-2.0
56 	iowrite16(ioread16(dev->base + SMCR) | SMCR_IEIC, dev->base + SMCR);  in highlander_i2c_irq_enable()
61 	iowrite16(ioread16(dev->base + SMCR) & ~SMCR_IEIC, dev->base + SMCR);  in highlander_i2c_irq_disable()
66 	iowrite16(ioread16(dev->base + SMCR) | SMCR_START, dev->base + SMCR);  in highlander_i2c_start()
71 	iowrite16(ioread16(dev->base + SMCR) | SMCR_IRIC, dev->base + SMCR);  in highlander_i2c_done()
78 	smmr = ioread16(dev->base + SMMR);  in highlander_i2c_setup()
86 	iowrite16(smmr, dev->base + SMMR);  in highlander_i2c_setup()
91 	for (; len > 1; len -= 2) {  in smbus_write_data()
102 	for (; len > 1; len -= 2) {  in smbus_read_data()
115 	u16 cmd = (command << 8) | command;  in highlander_i2c_command()  local
118 		if (len - i == 1)  in highlander_i2c_command()
119 			cmd = command << 8;  in highlander_i2c_command()
120 		iowrite16(cmd, dev->base + SMSADR + i);  in highlander_i2c_command()
121 		dev_dbg(dev->dev, "command data[%x] 0x%04x\n", i/2, cmd);  in highlander_i2c_command()
127 	unsigned long timeout;  in highlander_i2c_wait_for_bbsy()  local
129 	timeout = jiffies + msecs_to_jiffies(iic_timeout);  in highlander_i2c_wait_for_bbsy()
130 	while (ioread16(dev->base + SMCR) & SMCR_BBSY) {  in highlander_i2c_wait_for_bbsy()
131 		if (time_after(jiffies, timeout)) {  in highlander_i2c_wait_for_bbsy()
132 			dev_warn(dev->dev, "timeout waiting for bus ready\n");  in highlander_i2c_wait_for_bbsy()
133 			return -ETIMEDOUT;  in highlander_i2c_wait_for_bbsy()
144 	iowrite16(ioread16(dev->base + SMCR) | SMCR_RST, dev->base + SMCR);  in highlander_i2c_reset()
150 	u16 tmp = ioread16(dev->base + SMCR);  in highlander_i2c_wait_for_ack()
153 		dev_warn(dev->dev, "ack abnormality\n");  in highlander_i2c_wait_for_ack()
165 	complete(&dev->cmd_complete);  in highlander_i2c_irq()
172 	unsigned long timeout;  in highlander_i2c_poll()  local
175 	timeout = jiffies + msecs_to_jiffies(iic_timeout);  in highlander_i2c_poll()
177 		smcr = ioread16(dev->base + SMCR);  in highlander_i2c_poll()
187 		if (time_after(jiffies, timeout))  in highlander_i2c_poll()
194 	dev_err(dev->dev, "polling timed out\n");  in highlander_i2c_poll()
199 	if (dev->irq)  in highlander_i2c_wait_xfer_done()
200 		wait_for_completion_timeout(&dev->cmd_complete,  in highlander_i2c_wait_xfer_done()
215 		return -EAGAIN;  in highlander_i2c_read()
220 		dev_err(dev->dev, "Arbitration loss\n");  in highlander_i2c_read()
221 		return -EAGAIN;  in highlander_i2c_read()
231 	 * While this generally only applies to the older SH7780-based  in highlander_i2c_read()
233 	 * albeit less frequently. SH7780-based Highlanders may need  in highlander_i2c_read()
234 	 * this to be as high as 1000 ms.  in highlander_i2c_read()
236 	if (iic_read_delay && time_before(jiffies, dev->last_read_time +  in highlander_i2c_read()
238 		msleep(jiffies_to_msecs((dev->last_read_time +  in highlander_i2c_read()
239 				msecs_to_jiffies(iic_read_delay)) - jiffies));  in highlander_i2c_read()
241 	cnt = (dev->buf_len + 1) >> 1;  in highlander_i2c_read()
243 		data[i] = ioread16(dev->base + SMTRDR + (i * sizeof(u16)));  in highlander_i2c_read()
244 		dev_dbg(dev->dev, "read data[%x] 0x%04x\n", i, data[i]);  in highlander_i2c_read()
247 	smbus_read_data(data, dev->buf, dev->buf_len);  in highlander_i2c_read()
249 	dev->last_read_time = jiffies;  in highlander_i2c_read()
259 	smbus_write_data(dev->buf, data, dev->buf_len);  in highlander_i2c_write()
261 	cnt = (dev->buf_len + 1) >> 1;  in highlander_i2c_write()
263 		iowrite16(data[i], dev->base + SMTRDR + (i * sizeof(u16)));  in highlander_i2c_write()
264 		dev_dbg(dev->dev, "write data[%x] 0x%04x\n", i, data[i]);  in highlander_i2c_write()
268 		return -EAGAIN;  in highlander_i2c_write()
283 	init_completion(&dev->cmd_complete);  in highlander_i2c_smbus_xfer()
285 	dev_dbg(dev->dev, "addr %04x, command %02x, read_write %d, size %d\n",  in highlander_i2c_smbus_xfer()
293 		dev->buf = &data->byte;  in highlander_i2c_smbus_xfer()
294 		dev->buf_len = 1;  in highlander_i2c_smbus_xfer()
297 		dev->buf = &data->block[1];  in highlander_i2c_smbus_xfer()
298 		dev->buf_len = data->block[0];  in highlander_i2c_smbus_xfer()
301 		dev_err(dev->dev, "unsupported command %d\n", size);  in highlander_i2c_smbus_xfer()
302 		return -EINVAL;  in highlander_i2c_smbus_xfer()
308 	tmp = ioread16(dev->base + SMMR);  in highlander_i2c_smbus_xfer()
311 	switch (dev->buf_len) {  in highlander_i2c_smbus_xfer()
325 		dev_err(dev->dev, "unsupported xfer size %zu\n", dev->buf_len);  in highlander_i2c_smbus_xfer()
326 		return -EINVAL;  in highlander_i2c_smbus_xfer()
329 	iowrite16(tmp, dev->base + SMMR);  in highlander_i2c_smbus_xfer()
335 	iowrite16((addr << 1) | read_write, dev->base + SMSMADR);  in highlander_i2c_smbus_xfer()
337 	highlander_i2c_command(dev, command, dev->buf_len);  in highlander_i2c_smbus_xfer()
364 		dev_err(&pdev->dev, "no mem resource\n");  in highlander_i2c_probe()
365 		return -ENODEV;  in highlander_i2c_probe()
370 		return -ENOMEM;  in highlander_i2c_probe()
372 	dev->base = ioremap(res->start, resource_size(res));  in highlander_i2c_probe()
373 	if (unlikely(!dev->base)) {  in highlander_i2c_probe()
374 		ret = -ENXIO;  in highlander_i2c_probe()
378 	dev->dev = &pdev->dev;  in highlander_i2c_probe()
381 	dev->irq = platform_get_irq(pdev, 0);  in highlander_i2c_probe()
382 	if (dev->irq < 0 || iic_force_poll)  in highlander_i2c_probe()
383 		dev->irq = 0;  in highlander_i2c_probe()
385 	if (dev->irq) {  in highlander_i2c_probe()
386 		ret = request_irq(dev->irq, highlander_i2c_irq, 0,  in highlander_i2c_probe()
387 				  pdev->name, dev);  in highlander_i2c_probe()
393 		dev_notice(&pdev->dev, "no IRQ, using polling mode\n");  in highlander_i2c_probe()
397 	dev->last_read_time = jiffies;	/* initial read jiffies */  in highlander_i2c_probe()
401 	adap = &dev->adapter;  in highlander_i2c_probe()
403 	adap->owner = THIS_MODULE;  in highlander_i2c_probe()
404 	adap->class = I2C_CLASS_HWMON;  in highlander_i2c_probe()
405 	strscpy(adap->name, "HL FPGA I2C adapter", sizeof(adap->name));  in highlander_i2c_probe()
406 	adap->algo = &highlander_i2c_algo;  in highlander_i2c_probe()
407 	adap->dev.parent = &pdev->dev;  in highlander_i2c_probe()
408 	adap->nr = pdev->id;  in highlander_i2c_probe()
415 		dev_err(&pdev->dev, "controller didn't come up\n");  in highlander_i2c_probe()
421 		dev_err(&pdev->dev, "failure adding adapter\n");  in highlander_i2c_probe()
428 	if (dev->irq)  in highlander_i2c_probe()
429 		free_irq(dev->irq, dev);  in highlander_i2c_probe()
431 	iounmap(dev->base);  in highlander_i2c_probe()
442 	i2c_del_adapter(&dev->adapter);  in highlander_i2c_remove()
444 	if (dev->irq)  in highlander_i2c_remove()
445 		free_irq(dev->irq, dev);  in highlander_i2c_remove()
447 	iounmap(dev->base);  in highlander_i2c_remove()
453 		.name	= "i2c-highlander",
474 MODULE_PARM_DESC(iic_timeout, "Set timeout value in msecs (default 1000 ms)");
476 		 "Delay between data read cycles (default 0 ms)");