1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Freescale i.MX7D ADC driver
22 /* ADC register */
178 	info->adc_feature.clk_pre_div = IMX7D_ADC_ANALOG_CLK_PRE_DIV_4;  in imx7d_adc_feature_config()
179 	info->adc_feature.avg_num = IMX7D_ADC_AVERAGE_NUM_32;  in imx7d_adc_feature_config()
180 	info->adc_feature.core_time_unit = 1;  in imx7d_adc_feature_config()
185 	struct imx7d_adc_feature *adc_feature = &info->adc_feature;  in imx7d_adc_sample_rate_set()
197 			readl(info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);  in imx7d_adc_sample_rate_set()
200 		       info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);  in imx7d_adc_sample_rate_set()
203 	adc_analogure_clk = imx7d_adc_analogue_clk[adc_feature->clk_pre_div];  in imx7d_adc_sample_rate_set()
205 	info->pre_div_num = adc_analogure_clk.pre_div;  in imx7d_adc_sample_rate_set()
207 	sample_rate |= adc_feature->core_time_unit;  in imx7d_adc_sample_rate_set()
208 	writel(sample_rate, info->regs + IMX7D_REG_ADC_TIMER_UNIT);  in imx7d_adc_sample_rate_set()
215 	/* power up and enable adc analogue core */  in imx7d_adc_hw_init()
216 	cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_hw_init()
220 	writel(cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_hw_init()
224 	       info->regs + IMX7D_REG_ADC_INT_SIG_EN);  in imx7d_adc_hw_init()
226 	       info->regs + IMX7D_REG_ADC_INT_EN);  in imx7d_adc_hw_init()
237 	channel = info->channel;  in imx7d_adc_channel_set()
256 	cfg2 = readl(info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +  in imx7d_adc_channel_set()
259 	cfg2 |= imx7d_adc_average_num[info->adc_feature.avg_num];  in imx7d_adc_channel_set()
265 	writel(cfg2, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +  in imx7d_adc_channel_set()
267 	writel(cfg1, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel);  in imx7d_adc_channel_set()
273 	u32 core_time_unit = info->adc_feature.core_time_unit;  in imx7d_adc_get_sample_rate()
276 	analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;  in imx7d_adc_get_sample_rate()
295 		mutex_lock(&indio_dev->mlock);  in imx7d_adc_read_raw()
296 		reinit_completion(&info->completion);  in imx7d_adc_read_raw()
298 		channel = chan->channel & 0x03;  in imx7d_adc_read_raw()
299 		info->channel = channel;  in imx7d_adc_read_raw()
303 				(&info->completion, IMX7D_ADC_TIMEOUT);  in imx7d_adc_read_raw()
305 			mutex_unlock(&indio_dev->mlock);  in imx7d_adc_read_raw()
306 			return -ETIMEDOUT;  in imx7d_adc_read_raw()
309 			mutex_unlock(&indio_dev->mlock);  in imx7d_adc_read_raw()
313 		*val = info->value;  in imx7d_adc_read_raw()
314 		mutex_unlock(&indio_dev->mlock);  in imx7d_adc_read_raw()
318 		info->vref_uv = regulator_get_voltage(info->vref);  in imx7d_adc_read_raw()
319 		*val = info->vref_uv / 1000;  in imx7d_adc_read_raw()
328 		return -EINVAL;  in imx7d_adc_read_raw()
337 	channel = info->channel & 0x03;  in imx7d_adc_read_data()
346 		value = readl(info->regs + IMX7D_REG_ADC_CHA_B_CNV_RSLT);  in imx7d_adc_read_data()
348 		value = readl(info->regs + IMX7D_REG_ADC_CHC_D_CNV_RSLT);  in imx7d_adc_read_data()
362 	status = readl(info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
364 		info->value = imx7d_adc_read_data(info);  in imx7d_adc_isr()
365 		complete(&info->completion);  in imx7d_adc_isr()
374 		writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
382 		dev_err(info->dev,  in imx7d_adc_isr()
383 			"ADC got conversion time out interrupt: 0x%08x\n",  in imx7d_adc_isr()
386 		writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);  in imx7d_adc_isr()
399 		return -EINVAL;  in imx7d_adc_reg_access()
401 	*readval = readl(info->regs + reg);  in imx7d_adc_reg_access()
412 	{ .compatible = "fsl,imx7d-adc", },
421 	adc_cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_power_down()
425 	writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);  in imx7d_adc_power_down()
434 	ret = regulator_enable(info->vref);  in imx7d_adc_enable()
436 		dev_err(info->dev,  in imx7d_adc_enable()
437 			"Can't enable adc reference top voltage, err = %d\n",  in imx7d_adc_enable()
442 	ret = clk_prepare_enable(info->clk);  in imx7d_adc_enable()
444 		dev_err(info->dev,  in imx7d_adc_enable()
446 		regulator_disable(info->vref);  in imx7d_adc_enable()
462 	clk_disable_unprepare(info->clk);  in imx7d_adc_disable()
463 	regulator_disable(info->vref);  in imx7d_adc_disable()
477 	struct device *dev = &pdev->dev;  in imx7d_adc_probe()
483 		dev_err(&pdev->dev, "Failed allocating iio device\n");  in imx7d_adc_probe()
484 		return -ENOMEM;  in imx7d_adc_probe()
488 	info->dev = dev;  in imx7d_adc_probe()
490 	info->regs = devm_platform_ioremap_resource(pdev, 0);  in imx7d_adc_probe()
491 	if (IS_ERR(info->regs))  in imx7d_adc_probe()
492 		return PTR_ERR(info->regs);  in imx7d_adc_probe()
498 	info->clk = devm_clk_get(dev, "adc");  in imx7d_adc_probe()
499 	if (IS_ERR(info->clk)) {  in imx7d_adc_probe()
500 		ret = PTR_ERR(info->clk);  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 		ret = PTR_ERR(info->vref);  in imx7d_adc_probe()
515 	init_completion(&info->completion);  in imx7d_adc_probe()
517 	indio_dev->name = dev_name(dev);  in imx7d_adc_probe()
518 	indio_dev->info = &imx7d_adc_iio_info;  in imx7d_adc_probe()
519 	indio_dev->modes = INDIO_DIRECT_MODE;  in imx7d_adc_probe()
520 	indio_dev->channels = imx7d_adc_iio_channels;  in imx7d_adc_probe()
521 	indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels);  in imx7d_adc_probe()
531 	ret = imx7d_adc_enable(&indio_dev->dev);  in imx7d_adc_probe()
536 				       &indio_dev->dev);  in imx7d_adc_probe()
542 		dev_err(&pdev->dev, "Couldn't register the device.\n");  in imx7d_adc_probe()
563 MODULE_DESCRIPTION("Freescale IMX7D ADC driver");