92 static void sprd_i2c_set_count(struct sprd_i2c *i2c_dev, u32 count)  in sprd_i2c_set_count()  argument
94 	writel(count, i2c_dev->base + I2C_COUNT);  in sprd_i2c_set_count()
97 static void sprd_i2c_send_stop(struct sprd_i2c *i2c_dev, int stop)  in sprd_i2c_send_stop()  argument
99 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_send_stop()
102 		writel(tmp & ~STP_EN, i2c_dev->base + I2C_CTL);  in sprd_i2c_send_stop()
104 		writel(tmp | STP_EN, i2c_dev->base + I2C_CTL);  in sprd_i2c_send_stop()
107 static void sprd_i2c_clear_start(struct sprd_i2c *i2c_dev)  in sprd_i2c_clear_start()  argument
109 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_clear_start()
111 	writel(tmp & ~I2C_START, i2c_dev->base + I2C_CTL);  in sprd_i2c_clear_start()
114 static void sprd_i2c_clear_ack(struct sprd_i2c *i2c_dev)  in sprd_i2c_clear_ack()  argument
116 	u32 tmp = readl(i2c_dev->base + I2C_STATUS);  in sprd_i2c_clear_ack()
118 	writel(tmp & ~I2C_RX_ACK, i2c_dev->base + I2C_STATUS);  in sprd_i2c_clear_ack()
121 static void sprd_i2c_clear_irq(struct sprd_i2c *i2c_dev)  in sprd_i2c_clear_irq()  argument
123 	u32 tmp = readl(i2c_dev->base + I2C_STATUS);  in sprd_i2c_clear_irq()
125 	writel(tmp & ~I2C_INT, i2c_dev->base + I2C_STATUS);  in sprd_i2c_clear_irq()
128 static void sprd_i2c_reset_fifo(struct sprd_i2c *i2c_dev)  in sprd_i2c_reset_fifo()  argument
130 	writel(I2C_RST, i2c_dev->base + ADDR_RST);  in sprd_i2c_reset_fifo()
133 static void sprd_i2c_set_devaddr(struct sprd_i2c *i2c_dev, struct i2c_msg *m)  in sprd_i2c_set_devaddr()  argument
135 	writel(m->addr << 1, i2c_dev->base + I2C_ADDR_CFG);  in sprd_i2c_set_devaddr()
138 static void sprd_i2c_write_bytes(struct sprd_i2c *i2c_dev, u8 *buf, u32 len)  in sprd_i2c_write_bytes()  argument
143 		writeb(buf[i], i2c_dev->base + I2C_TX);  in sprd_i2c_write_bytes()
146 static void sprd_i2c_read_bytes(struct sprd_i2c *i2c_dev, u8 *buf, u32 len)  in sprd_i2c_read_bytes()  argument
151 		buf[i] = readb(i2c_dev->base + I2C_RX);  in sprd_i2c_read_bytes()
154 static void sprd_i2c_set_full_thld(struct sprd_i2c *i2c_dev, u32 full_thld)  in sprd_i2c_set_full_thld()  argument
156 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_set_full_thld()
160 	writel(tmp, i2c_dev->base + I2C_CTL);  in sprd_i2c_set_full_thld()
163 static void sprd_i2c_set_empty_thld(struct sprd_i2c *i2c_dev, u32 empty_thld)  in sprd_i2c_set_empty_thld()  argument
165 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_set_empty_thld()
169 	writel(tmp, i2c_dev->base + I2C_CTL);  in sprd_i2c_set_empty_thld()
172 static void sprd_i2c_set_fifo_full_int(struct sprd_i2c *i2c_dev, int enable)  in sprd_i2c_set_fifo_full_int()  argument
174 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_set_fifo_full_int()
181 	writel(tmp, i2c_dev->base + I2C_CTL);  in sprd_i2c_set_fifo_full_int()
184 static void sprd_i2c_set_fifo_empty_int(struct sprd_i2c *i2c_dev, int enable)  in sprd_i2c_set_fifo_empty_int()  argument
186 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_set_fifo_empty_int()
193 	writel(tmp, i2c_dev->base + I2C_CTL);  in sprd_i2c_set_fifo_empty_int()
196 static void sprd_i2c_opt_start(struct sprd_i2c *i2c_dev)  in sprd_i2c_opt_start()  argument
198 	u32 tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_opt_start()
200 	writel(tmp | I2C_START, i2c_dev->base + I2C_CTL);  in sprd_i2c_opt_start()
203 static void sprd_i2c_opt_mode(struct sprd_i2c *i2c_dev, int rw)  in sprd_i2c_opt_mode()  argument
205 	u32 cmd = readl(i2c_dev->base + I2C_CTL) & ~I2C_MODE;  in sprd_i2c_opt_mode()
207 	writel(cmd | rw << 3, i2c_dev->base + I2C_CTL);  in sprd_i2c_opt_mode()
210 static void sprd_i2c_data_transfer(struct sprd_i2c *i2c_dev)  in sprd_i2c_data_transfer()  argument
212 	u32 i2c_count = i2c_dev->count;  in sprd_i2c_data_transfer()
214 	struct i2c_msg *msg = i2c_dev->msg;  in sprd_i2c_data_transfer()
217 		sprd_i2c_read_bytes(i2c_dev, i2c_dev->buf, I2C_FIFO_FULL_THLD);  in sprd_i2c_data_transfer()
218 		i2c_dev->count -= I2C_FIFO_FULL_THLD;  in sprd_i2c_data_transfer()
219 		i2c_dev->buf += I2C_FIFO_FULL_THLD;  in sprd_i2c_data_transfer()
226 		if (i2c_dev->count >= I2C_FIFO_FULL_THLD)  in sprd_i2c_data_transfer()
227 			sprd_i2c_set_fifo_full_int(i2c_dev, 1);  in sprd_i2c_data_transfer()
229 		sprd_i2c_write_bytes(i2c_dev, i2c_dev->buf, need_tran);  in sprd_i2c_data_transfer()
230 		i2c_dev->buf += need_tran;  in sprd_i2c_data_transfer()
231 		i2c_dev->count -= need_tran;  in sprd_i2c_data_transfer()
239 			sprd_i2c_set_fifo_empty_int(i2c_dev, 1);  in sprd_i2c_data_transfer()
246 	struct sprd_i2c *i2c_dev = i2c_adap->algo_data;  in sprd_i2c_handle_msg()  local
248 	i2c_dev->msg = msg;  in sprd_i2c_handle_msg()
249 	i2c_dev->buf = msg->buf;  in sprd_i2c_handle_msg()
250 	i2c_dev->count = msg->len;  in sprd_i2c_handle_msg()
252 	reinit_completion(&i2c_dev->complete);  in sprd_i2c_handle_msg()
253 	sprd_i2c_reset_fifo(i2c_dev);  in sprd_i2c_handle_msg()
254 	sprd_i2c_set_devaddr(i2c_dev, msg);  in sprd_i2c_handle_msg()
255 	sprd_i2c_set_count(i2c_dev, msg->len);  in sprd_i2c_handle_msg()
258 		sprd_i2c_opt_mode(i2c_dev, 1);  in sprd_i2c_handle_msg()
259 		sprd_i2c_send_stop(i2c_dev, 1);  in sprd_i2c_handle_msg()
261 		sprd_i2c_opt_mode(i2c_dev, 0);  in sprd_i2c_handle_msg()
262 		sprd_i2c_send_stop(i2c_dev, !!is_last_msg);  in sprd_i2c_handle_msg()
270 		sprd_i2c_set_fifo_full_int(i2c_dev, 1);  in sprd_i2c_handle_msg()
272 		sprd_i2c_data_transfer(i2c_dev);  in sprd_i2c_handle_msg()
274 	sprd_i2c_opt_start(i2c_dev);  in sprd_i2c_handle_msg()
276 	wait_for_completion(&i2c_dev->complete);  in sprd_i2c_handle_msg()
278 	return i2c_dev->err;  in sprd_i2c_handle_msg()
284 	struct sprd_i2c *i2c_dev = i2c_adap->algo_data;  in sprd_i2c_master_xfer()  local
287 	ret = pm_runtime_get_sync(i2c_dev->dev);  in sprd_i2c_master_xfer()
300 	pm_runtime_mark_last_busy(i2c_dev->dev);  in sprd_i2c_master_xfer()
301 	pm_runtime_put_autosuspend(i2c_dev->dev);  in sprd_i2c_master_xfer()
316 static void sprd_i2c_set_clk(struct sprd_i2c *i2c_dev, u32 freq)  in sprd_i2c_set_clk()  argument
318 	u32 apb_clk = i2c_dev->src_clk;  in sprd_i2c_set_clk()
336 	writel(div0, i2c_dev->base + ADDR_DVD0);  in sprd_i2c_set_clk()
337 	writel(div1, i2c_dev->base + ADDR_DVD1);  in sprd_i2c_set_clk()
341 		writel((6 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);  in sprd_i2c_set_clk()
343 		writel((4 * apb_clk) / 1000000, i2c_dev->base + ADDR_STA0_DVD);  in sprd_i2c_set_clk()
346 static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)  in sprd_i2c_enable()  argument
350 	writel(tmp, i2c_dev->base + I2C_CTL);  in sprd_i2c_enable()
352 	sprd_i2c_set_full_thld(i2c_dev, I2C_FIFO_FULL_THLD);  in sprd_i2c_enable()
353 	sprd_i2c_set_empty_thld(i2c_dev, I2C_FIFO_EMPTY_THLD);  in sprd_i2c_enable()
355 	sprd_i2c_set_clk(i2c_dev, i2c_dev->bus_freq);  in sprd_i2c_enable()
356 	sprd_i2c_reset_fifo(i2c_dev);  in sprd_i2c_enable()
357 	sprd_i2c_clear_irq(i2c_dev);  in sprd_i2c_enable()
359 	tmp = readl(i2c_dev->base + I2C_CTL);  in sprd_i2c_enable()
360 	writel(tmp | I2C_EN | I2C_INT_EN, i2c_dev->base + I2C_CTL);  in sprd_i2c_enable()
365 	struct sprd_i2c *i2c_dev = dev_id;  in sprd_i2c_isr_thread()  local
366 	struct i2c_msg *msg = i2c_dev->msg;  in sprd_i2c_isr_thread()
367 	bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);  in sprd_i2c_isr_thread()
371 		i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;  in sprd_i2c_isr_thread()
373 		i2c_tran = i2c_dev->count;  in sprd_i2c_isr_thread()
384 		sprd_i2c_data_transfer(i2c_dev);  in sprd_i2c_isr_thread()
388 	i2c_dev->err = 0;  in sprd_i2c_isr_thread()
395 		i2c_dev->err = -EIO;  in sprd_i2c_isr_thread()
396 	else if (msg->flags & I2C_M_RD && i2c_dev->count)  in sprd_i2c_isr_thread()
397 		sprd_i2c_read_bytes(i2c_dev, i2c_dev->buf, i2c_dev->count);  in sprd_i2c_isr_thread()
400 	sprd_i2c_clear_ack(i2c_dev);  in sprd_i2c_isr_thread()
401 	sprd_i2c_clear_start(i2c_dev);  in sprd_i2c_isr_thread()
402 	complete(&i2c_dev->complete);  in sprd_i2c_isr_thread()
409 	struct sprd_i2c *i2c_dev = dev_id;  in sprd_i2c_isr()  local
410 	struct i2c_msg *msg = i2c_dev->msg;  in sprd_i2c_isr()
411 	bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);  in sprd_i2c_isr()
415 		i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;  in sprd_i2c_isr()
417 		i2c_tran = i2c_dev->count;  in sprd_i2c_isr()
431 		sprd_i2c_clear_start(i2c_dev);  in sprd_i2c_isr()
432 		sprd_i2c_clear_irq(i2c_dev);  in sprd_i2c_isr()
435 	sprd_i2c_set_fifo_empty_int(i2c_dev, 0);  in sprd_i2c_isr()
436 	sprd_i2c_set_fifo_full_int(i2c_dev, 0);  in sprd_i2c_isr()
441 static int sprd_i2c_clk_init(struct sprd_i2c *i2c_dev)  in sprd_i2c_clk_init()  argument
445 	clk_i2c = devm_clk_get(i2c_dev->dev, "i2c");  in sprd_i2c_clk_init()
447 		dev_warn(i2c_dev->dev, "i2c%d can't get the i2c clock\n",  in sprd_i2c_clk_init()
448 			 i2c_dev->adap.nr);  in sprd_i2c_clk_init()
452 	clk_parent = devm_clk_get(i2c_dev->dev, "source");  in sprd_i2c_clk_init()
454 		dev_warn(i2c_dev->dev, "i2c%d can't get the source clock\n",  in sprd_i2c_clk_init()
455 			 i2c_dev->adap.nr);  in sprd_i2c_clk_init()
460 		i2c_dev->src_clk = clk_get_rate(clk_i2c);  in sprd_i2c_clk_init()
462 		i2c_dev->src_clk = 26000000;  in sprd_i2c_clk_init()
464 	dev_dbg(i2c_dev->dev, "i2c%d set source clock is %d\n",  in sprd_i2c_clk_init()
465 		i2c_dev->adap.nr, i2c_dev->src_clk);  in sprd_i2c_clk_init()
467 	i2c_dev->clk = devm_clk_get(i2c_dev->dev, "enable");  in sprd_i2c_clk_init()
468 	if (IS_ERR(i2c_dev->clk)) {  in sprd_i2c_clk_init()
469 		dev_err(i2c_dev->dev, "i2c%d can't get the enable clock\n",  in sprd_i2c_clk_init()
470 			i2c_dev->adap.nr);  in sprd_i2c_clk_init()
471 		return PTR_ERR(i2c_dev->clk);  in sprd_i2c_clk_init()
480 	struct sprd_i2c *i2c_dev;  in sprd_i2c_probe()  local
486 	i2c_dev = devm_kzalloc(dev, sizeof(struct sprd_i2c), GFP_KERNEL);  in sprd_i2c_probe()
487 	if (!i2c_dev)  in sprd_i2c_probe()
490 	i2c_dev->base = devm_platform_ioremap_resource(pdev, 0);  in sprd_i2c_probe()
491 	if (IS_ERR(i2c_dev->base))  in sprd_i2c_probe()
492 		return PTR_ERR(i2c_dev->base);  in sprd_i2c_probe()
494 	i2c_dev->irq = platform_get_irq(pdev, 0);  in sprd_i2c_probe()
495 	if (i2c_dev->irq < 0)  in sprd_i2c_probe()
496 		return i2c_dev->irq;  in sprd_i2c_probe()
498 	i2c_set_adapdata(&i2c_dev->adap, i2c_dev);  in sprd_i2c_probe()
499 	init_completion(&i2c_dev->complete);  in sprd_i2c_probe()
500 	snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),  in sprd_i2c_probe()
503 	i2c_dev->bus_freq = I2C_MAX_STANDARD_MODE_FREQ;  in sprd_i2c_probe()
504 	i2c_dev->adap.owner = THIS_MODULE;  in sprd_i2c_probe()
505 	i2c_dev->dev = dev;  in sprd_i2c_probe()
506 	i2c_dev->adap.retries = 3;  in sprd_i2c_probe()
507 	i2c_dev->adap.algo = &sprd_i2c_algo;  in sprd_i2c_probe()
508 	i2c_dev->adap.algo_data = i2c_dev;  in sprd_i2c_probe()
509 	i2c_dev->adap.dev.parent = dev;  in sprd_i2c_probe()
510 	i2c_dev->adap.nr = pdev->id;  in sprd_i2c_probe()
511 	i2c_dev->adap.dev.of_node = dev->of_node;  in sprd_i2c_probe()
514 		i2c_dev->bus_freq = prop;  in sprd_i2c_probe()
517 	if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&  in sprd_i2c_probe()
518 	    i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ)  in sprd_i2c_probe()
521 	ret = sprd_i2c_clk_init(i2c_dev);  in sprd_i2c_probe()
525 	platform_set_drvdata(pdev, i2c_dev);  in sprd_i2c_probe()
527 	ret = clk_prepare_enable(i2c_dev->clk);  in sprd_i2c_probe()
531 	sprd_i2c_enable(i2c_dev);  in sprd_i2c_probe()
533 	pm_runtime_set_autosuspend_delay(i2c_dev->dev, SPRD_I2C_PM_TIMEOUT);  in sprd_i2c_probe()
534 	pm_runtime_use_autosuspend(i2c_dev->dev);  in sprd_i2c_probe()
535 	pm_runtime_set_active(i2c_dev->dev);  in sprd_i2c_probe()
536 	pm_runtime_enable(i2c_dev->dev);  in sprd_i2c_probe()
538 	ret = pm_runtime_get_sync(i2c_dev->dev);  in sprd_i2c_probe()
542 	ret = devm_request_threaded_irq(dev, i2c_dev->irq,  in sprd_i2c_probe()
545 		pdev->name, i2c_dev);  in sprd_i2c_probe()
547 		dev_err(&pdev->dev, "failed to request irq %d\n", i2c_dev->irq);  in sprd_i2c_probe()
551 	ret = i2c_add_numbered_adapter(&i2c_dev->adap);  in sprd_i2c_probe()
557 	pm_runtime_mark_last_busy(i2c_dev->dev);  in sprd_i2c_probe()
558 	pm_runtime_put_autosuspend(i2c_dev->dev);  in sprd_i2c_probe()
562 	pm_runtime_put_noidle(i2c_dev->dev);  in sprd_i2c_probe()
563 	pm_runtime_disable(i2c_dev->dev);  in sprd_i2c_probe()
564 	clk_disable_unprepare(i2c_dev->clk);  in sprd_i2c_probe()
570 	struct sprd_i2c *i2c_dev = platform_get_drvdata(pdev);  in sprd_i2c_remove()  local
573 	ret = pm_runtime_get_sync(i2c_dev->dev);  in sprd_i2c_remove()
577 	i2c_del_adapter(&i2c_dev->adap);  in sprd_i2c_remove()
578 	clk_disable_unprepare(i2c_dev->clk);  in sprd_i2c_remove()
580 	pm_runtime_put_noidle(i2c_dev->dev);  in sprd_i2c_remove()
581 	pm_runtime_disable(i2c_dev->dev);  in sprd_i2c_remove()
588 	struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);  in sprd_i2c_suspend_noirq()  local
590 	i2c_mark_adapter_suspended(&i2c_dev->adap);  in sprd_i2c_suspend_noirq()
596 	struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);  in sprd_i2c_resume_noirq()  local
598 	i2c_mark_adapter_resumed(&i2c_dev->adap);  in sprd_i2c_resume_noirq()
604 	struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);  in sprd_i2c_runtime_suspend()  local
606 	clk_disable_unprepare(i2c_dev->clk);  in sprd_i2c_runtime_suspend()
613 	struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);  in sprd_i2c_runtime_resume()  local
616 	ret = clk_prepare_enable(i2c_dev->clk);  in sprd_i2c_runtime_resume()
620 	sprd_i2c_enable(i2c_dev);  in sprd_i2c_runtime_resume()