1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Freescale i.MX7D ADC driver
24 /* ADC register */
181 	info->adc_feature.clk_pre_div = IMX7D_ADC_ANALOG_CLK_PRE_DIV_4;  in imx7d_adc_feature_config()
182 	info->adc_feature.avg_num = IMX7D_ADC_AVERAGE_NUM_32;  in imx7d_adc_feature_config()
183 	info->adc_feature.core_time_unit = 1;  in imx7d_adc_feature_config()
188 	struct imx7d_adc_feature *adc_feature = &info->adc_feature;  in imx7d_adc_sample_rate_set()
200 			readl(info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);  in imx7d_adc_sample_rate_set()
203 		       info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);  in imx7d_adc_sample_rate_set()
206 	adc_analogure_clk = imx7d_adc_analogue_clk[adc_feature->clk_pre_div];  in imx7d_adc_sample_rate_set()
208 	info->pre_div_num = adc_analogure_clk.pre_div;  in imx7d_adc_sample_rate_set()
210 	sample_rate |= adc_feature->core_time_unit;  in imx7d_adc_sample_rate_set()
211 	writel(sample_rate, info->regs + IMX7D_REG_ADC_TIMER_UNIT);  in imx7d_adc_sample_rate_set()
218 	/* power up and enable adc analogue core */  in imx7d_adc_hw_init()
219 	cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_hw_init()
223 	writel(cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_hw_init()
227 	       info->regs + IMX7D_REG_ADC_INT_SIG_EN);  in imx7d_adc_hw_init()
229 	       info->regs + IMX7D_REG_ADC_INT_EN);  in imx7d_adc_hw_init()
240 	channel = info->channel;  in imx7d_adc_channel_set()
259 	cfg2 = readl(info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +  in imx7d_adc_channel_set()
262 	cfg2 |= imx7d_adc_average_num[info->adc_feature.avg_num];  in imx7d_adc_channel_set()
268 	writel(cfg2, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +  in imx7d_adc_channel_set()
270 	writel(cfg1, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel);  in imx7d_adc_channel_set()
276 	u32 core_time_unit = info->adc_feature.core_time_unit;  in imx7d_adc_get_sample_rate()
279 	analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;  in imx7d_adc_get_sample_rate()
298 		mutex_lock(&info->lock);  in imx7d_adc_read_raw()
299 		reinit_completion(&info->completion);  in imx7d_adc_read_raw()
301 		channel = chan->channel & 0x03;  in imx7d_adc_read_raw()
302 		info->channel = channel;  in imx7d_adc_read_raw()
306 				(&info->completion, IMX7D_ADC_TIMEOUT);  in imx7d_adc_read_raw()
308 			mutex_unlock(&info->lock);  in imx7d_adc_read_raw()
309 			return -ETIMEDOUT;  in imx7d_adc_read_raw()
312 			mutex_unlock(&info->lock);  in imx7d_adc_read_raw()
316 		*val = info->value;  in imx7d_adc_read_raw()
317 		mutex_unlock(&info->lock);  in imx7d_adc_read_raw()
321 		info->vref_uv = regulator_get_voltage(info->vref);  in imx7d_adc_read_raw()
322 		*val = info->vref_uv / 1000;  in imx7d_adc_read_raw()
331 		return -EINVAL;  in imx7d_adc_read_raw()
340 	channel = info->channel & 0x03;  in imx7d_adc_read_data()
349 		value = readl(info->regs + IMX7D_REG_ADC_CHA_B_CNV_RSLT);  in imx7d_adc_read_data()
351 		value = readl(info->regs + IMX7D_REG_ADC_CHC_D_CNV_RSLT);  in imx7d_adc_read_data()
365 	status = readl(info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
367 		info->value = imx7d_adc_read_data(info);  in imx7d_adc_isr()
368 		complete(&info->completion);  in imx7d_adc_isr()
377 		writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
385 		dev_err(info->dev,  in imx7d_adc_isr()
386 			"ADC got conversion time out interrupt: 0x%08x\n",  in imx7d_adc_isr()
389 		writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
402 		return -EINVAL;  in imx7d_adc_reg_access()
404 	*readval = readl(info->regs + reg);  in imx7d_adc_reg_access()
415 	{ .compatible = "fsl,imx7d-adc", },
424 	adc_cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_power_down()
428 	writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_power_down()
437 	ret = regulator_enable(info->vref);  in imx7d_adc_enable()
439 		dev_err(info->dev,  in imx7d_adc_enable()
440 			"Can't enable adc reference top voltage, err = %d\n",  in imx7d_adc_enable()
445 	ret = clk_prepare_enable(info->clk);  in imx7d_adc_enable()
447 		dev_err(info->dev,  in imx7d_adc_enable()
449 		regulator_disable(info->vref);  in imx7d_adc_enable()
465 	clk_disable_unprepare(info->clk);  in imx7d_adc_disable()
466 	regulator_disable(info->vref);  in imx7d_adc_disable()
480 	struct device *dev = &pdev->dev;  in imx7d_adc_probe()
486 		dev_err(&pdev->dev, "Failed allocating iio device\n");  in imx7d_adc_probe()
487 		return -ENOMEM;  in imx7d_adc_probe()
491 	info->dev = dev;  in imx7d_adc_probe()
493 	info->regs = devm_platform_ioremap_resource(pdev, 0);  in imx7d_adc_probe()
494 	if (IS_ERR(info->regs))  in imx7d_adc_probe()
495 		return PTR_ERR(info->regs);  in imx7d_adc_probe()
501 	info->clk = devm_clk_get(dev, "adc");  in imx7d_adc_probe()
502 	if (IS_ERR(info->clk))  in imx7d_adc_probe()
503 		return dev_err_probe(dev, PTR_ERR(info->clk), "Failed getting clock\n");  in imx7d_adc_probe()
505 	info->vref = devm_regulator_get(dev, "vref");  in imx7d_adc_probe()
506 	if (IS_ERR(info->vref))  in imx7d_adc_probe()
507 		return dev_err_probe(dev, PTR_ERR(info->vref),  in imx7d_adc_probe()
512 	init_completion(&info->completion);  in imx7d_adc_probe()
514 	indio_dev->name = dev_name(dev);  in imx7d_adc_probe()
515 	indio_dev->info = &imx7d_adc_iio_info;  in imx7d_adc_probe()
516 	indio_dev->modes = INDIO_DIRECT_MODE;  in imx7d_adc_probe()
517 	indio_dev->channels = imx7d_adc_iio_channels;  in imx7d_adc_probe()
518 	indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels);  in imx7d_adc_probe()
536 	mutex_init(&info->lock);  in imx7d_adc_probe()
540 		dev_err(&pdev->dev, "Couldn't register the device.\n");  in imx7d_adc_probe()
562 MODULE_DESCRIPTION("Freescale IMX7D ADC driver");