133 static void rcar_i2c_write(struct rcar_i2c_priv *priv, int reg, u32 val)  in rcar_i2c_write()  argument
135 	writel(val, priv->io + reg);  in rcar_i2c_write()
138 static u32 rcar_i2c_read(struct rcar_i2c_priv *priv, int reg)  in rcar_i2c_read()  argument
140 	return readl(priv->io + reg);  in rcar_i2c_read()
143 static void rcar_i2c_init(struct rcar_i2c_priv *priv)  in rcar_i2c_init()  argument
146 	rcar_i2c_write(priv, ICMIER, 0);  in rcar_i2c_init()
147 	rcar_i2c_write(priv, ICMCR, 0);  in rcar_i2c_init()
148 	rcar_i2c_write(priv, ICMSR, 0);  in rcar_i2c_init()
149 	rcar_i2c_write(priv, ICMAR, 0);  in rcar_i2c_init()
152 static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)  in rcar_i2c_bus_barrier()  argument
158 		if (!(rcar_i2c_read(priv, ICMCR) & FSDA))  in rcar_i2c_bus_barrier()
166 static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,  in rcar_i2c_clock_calculate()  argument
176 	switch (priv->devtype) {  in rcar_i2c_clock_calculate()
203 	rate = clk_get_rate(priv->clk);  in rcar_i2c_clock_calculate()
245 		scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd);  in rcar_i2c_clock_calculate()
250 	priv->icccr = scgd << cdf_width | cdf;  in rcar_i2c_clock_calculate()
255 static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv)  in rcar_i2c_prepare_msg()  argument
257 	int read = !!rcar_i2c_is_recv(priv);  in rcar_i2c_prepare_msg()
259 	rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read);  in rcar_i2c_prepare_msg()
260 	rcar_i2c_write(priv, ICMSR, 0);  in rcar_i2c_prepare_msg()
261 	rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);  in rcar_i2c_prepare_msg()
262 	rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND);  in rcar_i2c_prepare_msg()
268 static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)  in rcar_i2c_irq_send()  argument
270 	struct i2c_msg *msg = priv->msg;  in rcar_i2c_irq_send()
285 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);  in rcar_i2c_irq_send()
287 	if (priv->pos < msg->len) {  in rcar_i2c_irq_send()
295 		rcar_i2c_write(priv, ICRXTX, msg->buf[priv->pos]);  in rcar_i2c_irq_send()
296 		priv->pos++;  in rcar_i2c_irq_send()
307 		if (priv->flags & ID_LAST_MSG)  in rcar_i2c_irq_send()
313 			rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq_send()
324 	rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_SEND);  in rcar_i2c_irq_send()
329 static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)  in rcar_i2c_irq_recv()  argument
331 	struct i2c_msg *msg = priv->msg;  in rcar_i2c_irq_recv()
347 	} else if (priv->pos < msg->len) {  in rcar_i2c_irq_recv()
351 		msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX);  in rcar_i2c_irq_recv()
352 		priv->pos++;  in rcar_i2c_irq_recv()
360 	if (priv->pos + 1 >= msg->len)  in rcar_i2c_irq_recv()
361 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq_recv()
363 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);  in rcar_i2c_irq_recv()
365 	rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_RECV);  in rcar_i2c_irq_recv()
370 static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)  in rcar_i2c_slave_irq()  argument
375 	ssr_raw = rcar_i2c_read(priv, ICSSR) & 0xff;  in rcar_i2c_slave_irq()
376 	ssr_filtered = ssr_raw & rcar_i2c_read(priv, ICSIER);  in rcar_i2c_slave_irq()
385 			i2c_slave_event(priv->slave, I2C_SLAVE_READ_REQUESTED, &value);  in rcar_i2c_slave_irq()
386 			rcar_i2c_write(priv, ICRXTX, value);  in rcar_i2c_slave_irq()
387 			rcar_i2c_write(priv, ICSIER, SDE | SSR | SAR);  in rcar_i2c_slave_irq()
389 			i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_REQUESTED, &value);  in rcar_i2c_slave_irq()
390 			rcar_i2c_read(priv, ICRXTX);	/* dummy read */  in rcar_i2c_slave_irq()
391 			rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR);  in rcar_i2c_slave_irq()
394 		rcar_i2c_write(priv, ICSSR, ~SAR & 0xff);  in rcar_i2c_slave_irq()
399 		i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value);  in rcar_i2c_slave_irq()
400 		rcar_i2c_write(priv, ICSIER, SAR | SSR);  in rcar_i2c_slave_irq()
401 		rcar_i2c_write(priv, ICSSR, ~SSR & 0xff);  in rcar_i2c_slave_irq()
408 		value = rcar_i2c_read(priv, ICRXTX);  in rcar_i2c_slave_irq()
409 		ret = i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_RECEIVED, &value);  in rcar_i2c_slave_irq()
411 		rcar_i2c_write(priv, ICSCR, SIE | SDBS | (ret < 0 ? FNA : 0));  in rcar_i2c_slave_irq()
412 		rcar_i2c_write(priv, ICSSR, ~SDR & 0xff);  in rcar_i2c_slave_irq()
417 		i2c_slave_event(priv->slave, I2C_SLAVE_READ_PROCESSED, &value);  in rcar_i2c_slave_irq()
418 		rcar_i2c_write(priv, ICRXTX, value);  in rcar_i2c_slave_irq()
419 		rcar_i2c_write(priv, ICSSR, ~SDE & 0xff);  in rcar_i2c_slave_irq()
427 	struct rcar_i2c_priv *priv = ptr;  in rcar_i2c_irq()  local
432 	spin_lock(&priv->lock);  in rcar_i2c_irq()
434 	if (rcar_i2c_slave_irq(priv))  in rcar_i2c_irq()
437 	msr = rcar_i2c_read(priv, ICMSR);  in rcar_i2c_irq()
440 	msr &= rcar_i2c_read(priv, ICMIER);  in rcar_i2c_irq()
448 		rcar_i2c_flags_set(priv, (ID_DONE | ID_ARBLOST));  in rcar_i2c_irq()
455 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq()
456 		rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);  in rcar_i2c_irq()
457 		rcar_i2c_flags_set(priv, ID_NACK);  in rcar_i2c_irq()
463 		rcar_i2c_flags_set(priv, ID_DONE);  in rcar_i2c_irq()
467 	if (rcar_i2c_is_recv(priv))  in rcar_i2c_irq()
468 		rcar_i2c_flags_set(priv, rcar_i2c_irq_recv(priv, msr));  in rcar_i2c_irq()
470 		rcar_i2c_flags_set(priv, rcar_i2c_irq_send(priv, msr));  in rcar_i2c_irq()
473 	if (rcar_i2c_flags_has(priv, ID_DONE)) {  in rcar_i2c_irq()
474 		rcar_i2c_write(priv, ICMIER, 0);  in rcar_i2c_irq()
475 		rcar_i2c_write(priv, ICMSR, 0);  in rcar_i2c_irq()
476 		wake_up(&priv->wait);  in rcar_i2c_irq()
480 	spin_unlock(&priv->lock);  in rcar_i2c_irq()
490 	struct rcar_i2c_priv *priv = i2c_get_adapdata(adap);  in rcar_i2c_master_xfer()  local
491 	struct device *dev = rcar_i2c_priv_to_dev(priv);  in rcar_i2c_master_xfer()
498 	spin_lock_irqsave(&priv->lock, flags);  in rcar_i2c_master_xfer()
500 	rcar_i2c_init(priv);  in rcar_i2c_master_xfer()
502 	rcar_i2c_write(priv, ICCCR, priv->icccr);  in rcar_i2c_master_xfer()
504 	spin_unlock_irqrestore(&priv->lock, flags);  in rcar_i2c_master_xfer()
507 	ret = rcar_i2c_bus_barrier(priv);  in rcar_i2c_master_xfer()
519 		spin_lock_irqsave(&priv->lock, flags);  in rcar_i2c_master_xfer()
522 		priv->msg	= &msgs[i];  in rcar_i2c_master_xfer()
523 		priv->pos	= 0;  in rcar_i2c_master_xfer()
524 		priv->flags	= 0;  in rcar_i2c_master_xfer()
526 			rcar_i2c_flags_set(priv, ID_LAST_MSG);  in rcar_i2c_master_xfer()
528 		rcar_i2c_prepare_msg(priv);  in rcar_i2c_master_xfer()
530 		spin_unlock_irqrestore(&priv->lock, flags);  in rcar_i2c_master_xfer()
533 		timeout = wait_event_timeout(priv->wait,  in rcar_i2c_master_xfer()
534 					     rcar_i2c_flags_has(priv, ID_DONE),  in rcar_i2c_master_xfer()
541 		if (rcar_i2c_flags_has(priv, ID_NACK)) {  in rcar_i2c_master_xfer()
546 		if (rcar_i2c_flags_has(priv, ID_ARBLOST)) {  in rcar_i2c_master_xfer()
551 		if (rcar_i2c_flags_has(priv, ID_IOERROR)) {  in rcar_i2c_master_xfer()
562 		dev_err(dev, "error %d : %x\n", ret, priv->flags);  in rcar_i2c_master_xfer()
569 	struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter);  in rcar_reg_slave()  local
571 	if (priv->slave)  in rcar_reg_slave()
577 	pm_runtime_forbid(rcar_i2c_priv_to_dev(priv));  in rcar_reg_slave()
579 	priv->slave = slave;  in rcar_reg_slave()
580 	rcar_i2c_write(priv, ICSAR, slave->addr);  in rcar_reg_slave()
581 	rcar_i2c_write(priv, ICSSR, 0);  in rcar_reg_slave()
582 	rcar_i2c_write(priv, ICSIER, SAR | SSR);  in rcar_reg_slave()
583 	rcar_i2c_write(priv, ICSCR, SIE | SDBS);  in rcar_reg_slave()
590 	struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter);  in rcar_unreg_slave()  local
592 	WARN_ON(!priv->slave);  in rcar_unreg_slave()
594 	rcar_i2c_write(priv, ICSIER, 0);  in rcar_unreg_slave()
595 	rcar_i2c_write(priv, ICSCR, 0);  in rcar_unreg_slave()
597 	priv->slave = NULL;  in rcar_unreg_slave()
599 	pm_runtime_allow(rcar_i2c_priv_to_dev(priv));  in rcar_unreg_slave()
633 	struct rcar_i2c_priv *priv;  in rcar_i2c_probe()  local
640 	priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL);  in rcar_i2c_probe()
641 	if (!priv)  in rcar_i2c_probe()
644 	priv->clk = devm_clk_get(dev, NULL);  in rcar_i2c_probe()
645 	if (IS_ERR(priv->clk)) {  in rcar_i2c_probe()
647 		return PTR_ERR(priv->clk);  in rcar_i2c_probe()
656 		priv->devtype = (long)of_match_device(rcar_i2c_dt_ids,  in rcar_i2c_probe()
659 		priv->devtype = platform_get_device_id(pdev)->driver_data;  in rcar_i2c_probe()
661 	ret = rcar_i2c_clock_calculate(priv, bus_speed, dev);  in rcar_i2c_probe()
666 	priv->io = devm_ioremap_resource(dev, res);  in rcar_i2c_probe()
667 	if (IS_ERR(priv->io))  in rcar_i2c_probe()
668 		return PTR_ERR(priv->io);  in rcar_i2c_probe()
671 	init_waitqueue_head(&priv->wait);  in rcar_i2c_probe()
672 	spin_lock_init(&priv->lock);  in rcar_i2c_probe()
674 	adap = &priv->adap;  in rcar_i2c_probe()
681 	i2c_set_adapdata(adap, priv);  in rcar_i2c_probe()
685 			       dev_name(dev), priv);  in rcar_i2c_probe()
692 	platform_set_drvdata(pdev, priv);  in rcar_i2c_probe()
708 	struct rcar_i2c_priv *priv = platform_get_drvdata(pdev);  in rcar_i2c_remove()  local
711 	i2c_del_adapter(&priv->adap);  in rcar_i2c_remove()