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()
204 	rate = clk_get_rate(priv->clk);  in rcar_i2c_clock_calculate()
246 		scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd);  in rcar_i2c_clock_calculate()
251 	priv->icccr = scgd << cdf_width | cdf;  in rcar_i2c_clock_calculate()
256 static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv)  in rcar_i2c_prepare_msg()  argument
258 	int read = !!rcar_i2c_is_recv(priv);  in rcar_i2c_prepare_msg()
260 	rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read);  in rcar_i2c_prepare_msg()
261 	rcar_i2c_write(priv, ICMSR, 0);  in rcar_i2c_prepare_msg()
262 	rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);  in rcar_i2c_prepare_msg()
263 	rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND);  in rcar_i2c_prepare_msg()
269 static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)  in rcar_i2c_irq_send()  argument
271 	struct i2c_msg *msg = priv->msg;  in rcar_i2c_irq_send()
286 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);  in rcar_i2c_irq_send()
288 	if (priv->pos < msg->len) {  in rcar_i2c_irq_send()
296 		rcar_i2c_write(priv, ICRXTX, msg->buf[priv->pos]);  in rcar_i2c_irq_send()
297 		priv->pos++;  in rcar_i2c_irq_send()
308 		if (priv->flags & ID_LAST_MSG)  in rcar_i2c_irq_send()
314 			rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq_send()
325 	rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_SEND);  in rcar_i2c_irq_send()
330 static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)  in rcar_i2c_irq_recv()  argument
332 	struct i2c_msg *msg = priv->msg;  in rcar_i2c_irq_recv()
348 	} else if (priv->pos < msg->len) {  in rcar_i2c_irq_recv()
352 		msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX);  in rcar_i2c_irq_recv()
353 		priv->pos++;  in rcar_i2c_irq_recv()
361 	if (priv->pos + 1 >= msg->len)  in rcar_i2c_irq_recv()
362 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq_recv()
364 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);  in rcar_i2c_irq_recv()
366 	rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_RECV);  in rcar_i2c_irq_recv()
371 static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)  in rcar_i2c_slave_irq()  argument
376 	ssr_raw = rcar_i2c_read(priv, ICSSR) & 0xff;  in rcar_i2c_slave_irq()
377 	ssr_filtered = ssr_raw & rcar_i2c_read(priv, ICSIER);  in rcar_i2c_slave_irq()
386 			i2c_slave_event(priv->slave, I2C_SLAVE_READ_REQUESTED, &value);  in rcar_i2c_slave_irq()
387 			rcar_i2c_write(priv, ICRXTX, value);  in rcar_i2c_slave_irq()
388 			rcar_i2c_write(priv, ICSIER, SDE | SSR | SAR);  in rcar_i2c_slave_irq()
390 			i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_REQUESTED, &value);  in rcar_i2c_slave_irq()
391 			rcar_i2c_read(priv, ICRXTX);	/* dummy read */  in rcar_i2c_slave_irq()
392 			rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR);  in rcar_i2c_slave_irq()
395 		rcar_i2c_write(priv, ICSSR, ~SAR & 0xff);  in rcar_i2c_slave_irq()
400 		i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value);  in rcar_i2c_slave_irq()
401 		rcar_i2c_write(priv, ICSIER, SAR | SSR);  in rcar_i2c_slave_irq()
402 		rcar_i2c_write(priv, ICSSR, ~SSR & 0xff);  in rcar_i2c_slave_irq()
409 		value = rcar_i2c_read(priv, ICRXTX);  in rcar_i2c_slave_irq()
410 		ret = i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_RECEIVED, &value);  in rcar_i2c_slave_irq()
412 		rcar_i2c_write(priv, ICSCR, SIE | SDBS | (ret < 0 ? FNA : 0));  in rcar_i2c_slave_irq()
413 		rcar_i2c_write(priv, ICSSR, ~SDR & 0xff);  in rcar_i2c_slave_irq()
418 		i2c_slave_event(priv->slave, I2C_SLAVE_READ_PROCESSED, &value);  in rcar_i2c_slave_irq()
419 		rcar_i2c_write(priv, ICRXTX, value);  in rcar_i2c_slave_irq()
420 		rcar_i2c_write(priv, ICSSR, ~SDE & 0xff);  in rcar_i2c_slave_irq()
428 	struct rcar_i2c_priv *priv = ptr;  in rcar_i2c_irq()  local
433 	spin_lock(&priv->lock);  in rcar_i2c_irq()
435 	if (rcar_i2c_slave_irq(priv))  in rcar_i2c_irq()
438 	msr = rcar_i2c_read(priv, ICMSR);  in rcar_i2c_irq()
441 	msr &= rcar_i2c_read(priv, ICMIER);  in rcar_i2c_irq()
449 		rcar_i2c_flags_set(priv, (ID_DONE | ID_ARBLOST));  in rcar_i2c_irq()
456 		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);  in rcar_i2c_irq()
457 		rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);  in rcar_i2c_irq()
458 		rcar_i2c_flags_set(priv, ID_NACK);  in rcar_i2c_irq()
464 		rcar_i2c_flags_set(priv, ID_DONE);  in rcar_i2c_irq()
468 	if (rcar_i2c_is_recv(priv))  in rcar_i2c_irq()
469 		rcar_i2c_flags_set(priv, rcar_i2c_irq_recv(priv, msr));  in rcar_i2c_irq()
471 		rcar_i2c_flags_set(priv, rcar_i2c_irq_send(priv, msr));  in rcar_i2c_irq()
474 	if (rcar_i2c_flags_has(priv, ID_DONE)) {  in rcar_i2c_irq()
475 		rcar_i2c_write(priv, ICMIER, 0);  in rcar_i2c_irq()
476 		rcar_i2c_write(priv, ICMSR, 0);  in rcar_i2c_irq()
477 		wake_up(&priv->wait);  in rcar_i2c_irq()
481 	spin_unlock(&priv->lock);  in rcar_i2c_irq()
491 	struct rcar_i2c_priv *priv = i2c_get_adapdata(adap);  in rcar_i2c_master_xfer()  local
492 	struct device *dev = rcar_i2c_priv_to_dev(priv);  in rcar_i2c_master_xfer()
500 	spin_lock_irqsave(&priv->lock, flags);  in rcar_i2c_master_xfer()
502 	rcar_i2c_init(priv);  in rcar_i2c_master_xfer()
504 	rcar_i2c_write(priv, ICCCR, priv->icccr);  in rcar_i2c_master_xfer()
506 	spin_unlock_irqrestore(&priv->lock, flags);  in rcar_i2c_master_xfer()
509 	ret = rcar_i2c_bus_barrier(priv);  in rcar_i2c_master_xfer()
521 		spin_lock_irqsave(&priv->lock, flags);  in rcar_i2c_master_xfer()
524 		priv->msg	= &msgs[i];  in rcar_i2c_master_xfer()
525 		priv->pos	= 0;  in rcar_i2c_master_xfer()
526 		priv->flags	= 0;  in rcar_i2c_master_xfer()
528 			rcar_i2c_flags_set(priv, ID_LAST_MSG);  in rcar_i2c_master_xfer()
530 		rcar_i2c_prepare_msg(priv);  in rcar_i2c_master_xfer()
532 		spin_unlock_irqrestore(&priv->lock, flags);  in rcar_i2c_master_xfer()
535 		timeout = wait_event_timeout(priv->wait,  in rcar_i2c_master_xfer()
536 					     rcar_i2c_flags_has(priv, ID_DONE),  in rcar_i2c_master_xfer()
543 		if (rcar_i2c_flags_has(priv, ID_NACK)) {  in rcar_i2c_master_xfer()
548 		if (rcar_i2c_flags_has(priv, ID_ARBLOST)) {  in rcar_i2c_master_xfer()
553 		if (rcar_i2c_flags_has(priv, ID_IOERROR)) {  in rcar_i2c_master_xfer()
564 		dev_err(dev, "error %d : %x\n", ret, priv->flags);  in rcar_i2c_master_xfer()
571 	struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter);  in rcar_reg_slave()  local
573 	if (priv->slave)  in rcar_reg_slave()
579 	pm_runtime_get_sync(rcar_i2c_priv_to_dev(priv));  in rcar_reg_slave()
581 	priv->slave = slave;  in rcar_reg_slave()
582 	rcar_i2c_write(priv, ICSAR, slave->addr);  in rcar_reg_slave()
583 	rcar_i2c_write(priv, ICSSR, 0);  in rcar_reg_slave()
584 	rcar_i2c_write(priv, ICSIER, SAR | SSR);  in rcar_reg_slave()
585 	rcar_i2c_write(priv, ICSCR, SIE | SDBS);  in rcar_reg_slave()
592 	struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter);  in rcar_unreg_slave()  local
594 	WARN_ON(!priv->slave);  in rcar_unreg_slave()
596 	rcar_i2c_write(priv, ICSIER, 0);  in rcar_unreg_slave()
597 	rcar_i2c_write(priv, ICSCR, 0);  in rcar_unreg_slave()
599 	priv->slave = NULL;  in rcar_unreg_slave()
601 	pm_runtime_put(rcar_i2c_priv_to_dev(priv));  in rcar_unreg_slave()
636 	struct rcar_i2c_priv *priv;  in rcar_i2c_probe()  local
643 	priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL);  in rcar_i2c_probe()
644 	if (!priv)  in rcar_i2c_probe()
647 	priv->clk = devm_clk_get(dev, NULL);  in rcar_i2c_probe()
648 	if (IS_ERR(priv->clk)) {  in rcar_i2c_probe()
650 		return PTR_ERR(priv->clk);  in rcar_i2c_probe()
656 	priv->devtype = (enum rcar_i2c_type)of_match_device(rcar_i2c_dt_ids, dev)->data;  in rcar_i2c_probe()
658 	ret = rcar_i2c_clock_calculate(priv, bus_speed, dev);  in rcar_i2c_probe()
663 	priv->io = devm_ioremap_resource(dev, res);  in rcar_i2c_probe()
664 	if (IS_ERR(priv->io))  in rcar_i2c_probe()
665 		return PTR_ERR(priv->io);  in rcar_i2c_probe()
668 	init_waitqueue_head(&priv->wait);  in rcar_i2c_probe()
669 	spin_lock_init(&priv->lock);  in rcar_i2c_probe()
671 	adap = &priv->adap;  in rcar_i2c_probe()
678 	i2c_set_adapdata(adap, priv);  in rcar_i2c_probe()
682 			       dev_name(dev), priv);  in rcar_i2c_probe()
689 	platform_set_drvdata(pdev, priv);  in rcar_i2c_probe()
705 	struct rcar_i2c_priv *priv = platform_get_drvdata(pdev);  in rcar_i2c_remove()  local
708 	i2c_del_adapter(&priv->adap);  in rcar_i2c_remove()