67 static inline void bcm2835_i2c_writel(struct bcm2835_i2c_dev *i2c_dev,  in bcm2835_i2c_writel()  argument
70 	writel(val, i2c_dev->regs + reg);  in bcm2835_i2c_writel()
73 static inline u32 bcm2835_i2c_readl(struct bcm2835_i2c_dev *i2c_dev, u32 reg)  in bcm2835_i2c_readl()  argument
75 	return readl(i2c_dev->regs + reg);  in bcm2835_i2c_readl()
81 	struct bcm2835_i2c_dev *i2c_dev;  member
113 	bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_DIV, divider);  in clk_bcm2835_i2c_set_rate()
128 	bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_DEL,  in clk_bcm2835_i2c_set_rate()
146 	u32 divider = bcm2835_i2c_readl(div->i2c_dev, BCM2835_I2C_DIV);  in clk_bcm2835_i2c_recalc_rate()
159 					struct bcm2835_i2c_dev *i2c_dev)  in bcm2835_i2c_register_div()  argument
181 	priv->i2c_dev = i2c_dev;  in bcm2835_i2c_register_div()
187 static void bcm2835_fill_txfifo(struct bcm2835_i2c_dev *i2c_dev)  in bcm2835_fill_txfifo()  argument
191 	while (i2c_dev->msg_buf_remaining) {  in bcm2835_fill_txfifo()
192 		val = bcm2835_i2c_readl(i2c_dev, BCM2835_I2C_S);  in bcm2835_fill_txfifo()
195 		bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_FIFO,  in bcm2835_fill_txfifo()
196 				   *i2c_dev->msg_buf);  in bcm2835_fill_txfifo()
197 		i2c_dev->msg_buf++;  in bcm2835_fill_txfifo()
198 		i2c_dev->msg_buf_remaining--;  in bcm2835_fill_txfifo()
202 static void bcm2835_drain_rxfifo(struct bcm2835_i2c_dev *i2c_dev)  in bcm2835_drain_rxfifo()  argument
206 	while (i2c_dev->msg_buf_remaining) {  in bcm2835_drain_rxfifo()
207 		val = bcm2835_i2c_readl(i2c_dev, BCM2835_I2C_S);  in bcm2835_drain_rxfifo()
210 		*i2c_dev->msg_buf = bcm2835_i2c_readl(i2c_dev,  in bcm2835_drain_rxfifo()
212 		i2c_dev->msg_buf++;  in bcm2835_drain_rxfifo()
213 		i2c_dev->msg_buf_remaining--;  in bcm2835_drain_rxfifo()
230 static void bcm2835_i2c_start_transfer(struct bcm2835_i2c_dev *i2c_dev)  in bcm2835_i2c_start_transfer()  argument
233 	struct i2c_msg *msg = i2c_dev->curr_msg;  in bcm2835_i2c_start_transfer()
234 	bool last_msg = (i2c_dev->num_msgs == 1);  in bcm2835_i2c_start_transfer()
236 	if (!i2c_dev->num_msgs)  in bcm2835_i2c_start_transfer()
239 	i2c_dev->num_msgs--;  in bcm2835_i2c_start_transfer()
240 	i2c_dev->msg_buf = msg->buf;  in bcm2835_i2c_start_transfer()
241 	i2c_dev->msg_buf_remaining = msg->len;  in bcm2835_i2c_start_transfer()
251 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_A, msg->addr);  in bcm2835_i2c_start_transfer()
252 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DLEN, msg->len);  in bcm2835_i2c_start_transfer()
253 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, c);  in bcm2835_i2c_start_transfer()
256 static void bcm2835_i2c_finish_transfer(struct bcm2835_i2c_dev *i2c_dev)  in bcm2835_i2c_finish_transfer()  argument
258 	i2c_dev->curr_msg = NULL;  in bcm2835_i2c_finish_transfer()
259 	i2c_dev->num_msgs = 0;  in bcm2835_i2c_finish_transfer()
261 	i2c_dev->msg_buf = NULL;  in bcm2835_i2c_finish_transfer()
262 	i2c_dev->msg_buf_remaining = 0;  in bcm2835_i2c_finish_transfer()
276 	struct bcm2835_i2c_dev *i2c_dev = data;  in bcm2835_i2c_isr()  local
279 	val = bcm2835_i2c_readl(i2c_dev, BCM2835_I2C_S);  in bcm2835_i2c_isr()
283 		i2c_dev->msg_err = err;  in bcm2835_i2c_isr()
288 		if (!i2c_dev->curr_msg) {  in bcm2835_i2c_isr()
289 			dev_err(i2c_dev->dev, "Got unexpected interrupt (from firmware?)\n");  in bcm2835_i2c_isr()
290 		} else if (i2c_dev->curr_msg->flags & I2C_M_RD) {  in bcm2835_i2c_isr()
291 			bcm2835_drain_rxfifo(i2c_dev);  in bcm2835_i2c_isr()
292 			val = bcm2835_i2c_readl(i2c_dev, BCM2835_I2C_S);  in bcm2835_i2c_isr()
295 		if ((val & BCM2835_I2C_S_RXD) || i2c_dev->msg_buf_remaining)  in bcm2835_i2c_isr()
296 			i2c_dev->msg_err = BCM2835_I2C_S_LEN;  in bcm2835_i2c_isr()
298 			i2c_dev->msg_err = 0;  in bcm2835_i2c_isr()
303 		if (!i2c_dev->msg_buf_remaining) {  in bcm2835_i2c_isr()
304 			i2c_dev->msg_err = val | BCM2835_I2C_S_LEN;  in bcm2835_i2c_isr()
308 		bcm2835_fill_txfifo(i2c_dev);  in bcm2835_i2c_isr()
310 		if (i2c_dev->num_msgs && !i2c_dev->msg_buf_remaining) {  in bcm2835_i2c_isr()
311 			i2c_dev->curr_msg++;  in bcm2835_i2c_isr()
312 			bcm2835_i2c_start_transfer(i2c_dev);  in bcm2835_i2c_isr()
319 		if (!i2c_dev->msg_buf_remaining) {  in bcm2835_i2c_isr()
320 			i2c_dev->msg_err = val | BCM2835_I2C_S_LEN;  in bcm2835_i2c_isr()
324 		bcm2835_drain_rxfifo(i2c_dev);  in bcm2835_i2c_isr()
331 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, BCM2835_I2C_C_CLEAR);  in bcm2835_i2c_isr()
332 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_S, BCM2835_I2C_S_CLKT |  in bcm2835_i2c_isr()
334 	complete(&i2c_dev->completion);  in bcm2835_i2c_isr()
342 	struct bcm2835_i2c_dev *i2c_dev = i2c_get_adapdata(adap);  in bcm2835_i2c_xfer()  local
348 			dev_warn_once(i2c_dev->dev,  in bcm2835_i2c_xfer()
353 	i2c_dev->curr_msg = msgs;  in bcm2835_i2c_xfer()
354 	i2c_dev->num_msgs = num;  in bcm2835_i2c_xfer()
355 	reinit_completion(&i2c_dev->completion);  in bcm2835_i2c_xfer()
357 	bcm2835_i2c_start_transfer(i2c_dev);  in bcm2835_i2c_xfer()
359 	time_left = wait_for_completion_timeout(&i2c_dev->completion,  in bcm2835_i2c_xfer()
362 	bcm2835_i2c_finish_transfer(i2c_dev);  in bcm2835_i2c_xfer()
365 		bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C,  in bcm2835_i2c_xfer()
367 		dev_err(i2c_dev->dev, "i2c transfer timed out\n");  in bcm2835_i2c_xfer()
371 	if (!i2c_dev->msg_err)  in bcm2835_i2c_xfer()
374 	dev_dbg(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);  in bcm2835_i2c_xfer()
376 	if (i2c_dev->msg_err & BCM2835_I2C_S_ERR)  in bcm2835_i2c_xfer()
403 	struct bcm2835_i2c_dev *i2c_dev;  in bcm2835_i2c_probe()  local
411 	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);  in bcm2835_i2c_probe()
412 	if (!i2c_dev)  in bcm2835_i2c_probe()
414 	platform_set_drvdata(pdev, i2c_dev);  in bcm2835_i2c_probe()
415 	i2c_dev->dev = &pdev->dev;  in bcm2835_i2c_probe()
416 	init_completion(&i2c_dev->completion);  in bcm2835_i2c_probe()
419 	i2c_dev->regs = devm_ioremap_resource(&pdev->dev, mem);  in bcm2835_i2c_probe()
420 	if (IS_ERR(i2c_dev->regs))  in bcm2835_i2c_probe()
421 		return PTR_ERR(i2c_dev->regs);  in bcm2835_i2c_probe()
430 	bus_clk = bcm2835_i2c_register_div(&pdev->dev, mclk, i2c_dev);  in bcm2835_i2c_probe()
462 	i2c_dev->irq = irq->start;  in bcm2835_i2c_probe()
464 	ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,  in bcm2835_i2c_probe()
465 			  dev_name(&pdev->dev), i2c_dev);  in bcm2835_i2c_probe()
471 	adap = &i2c_dev->adapter;  in bcm2835_i2c_probe()
472 	i2c_set_adapdata(adap, i2c_dev);  in bcm2835_i2c_probe()
482 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, 0);  in bcm2835_i2c_probe()
486 		free_irq(i2c_dev->irq, i2c_dev);  in bcm2835_i2c_probe()
493 	struct bcm2835_i2c_dev *i2c_dev = platform_get_drvdata(pdev);  in bcm2835_i2c_remove()  local
494 	struct clk *bus_clk = devm_clk_get(i2c_dev->dev, "div");  in bcm2835_i2c_remove()
499 	free_irq(i2c_dev->irq, i2c_dev);  in bcm2835_i2c_remove()
500 	i2c_del_adapter(&i2c_dev->adapter);  in bcm2835_i2c_remove()