1 // SPDX-License-Identifier: GPL-2.0+
3  * NXP i.MX93 ADC driver
22 #define IMX93_ADC_DRIVER_NAME	"imx93-adc"
42 /* ADC bit shift */
61 /* ADC status */
102 static void imx93_adc_power_down(struct imx93_adc *adc)  in imx93_adc_power_down()  argument
107 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_down()
109 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_down()
111 	ret = readl_poll_timeout(adc->regs + IMX93_ADC_MSR, msr,  in imx93_adc_power_down()
115 	if (ret == -ETIMEDOUT)  in imx93_adc_power_down()
116 		dev_warn(adc->dev,  in imx93_adc_power_down()
117 			 "ADC do not in power down mode, current MSR is %x\n",  in imx93_adc_power_down()
121 static void imx93_adc_power_up(struct imx93_adc *adc)  in imx93_adc_power_up()  argument
125 	/* bring ADC out of power down state, in idle state */  in imx93_adc_power_up()
126 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_up()
128 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_up()
131 static void imx93_adc_config_ad_clk(struct imx93_adc *adc)  in imx93_adc_config_ad_clk()  argument
135 	/* put adc in power down mode */  in imx93_adc_config_ad_clk()
136 	imx93_adc_power_down(adc);  in imx93_adc_config_ad_clk()
139 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_config_ad_clk()
141 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_config_ad_clk()
143 	imx93_adc_power_up(adc);  in imx93_adc_config_ad_clk()
146 static int imx93_adc_calibration(struct imx93_adc *adc)  in imx93_adc_calibration()  argument
151 	/* make sure ADC in power down mode */  in imx93_adc_calibration()
152 	imx93_adc_power_down(adc);  in imx93_adc_calibration()
155 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
157 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
159 	imx93_adc_power_up(adc);  in imx93_adc_calibration()
167 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
169 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
172 	ret = readl_poll_timeout(adc->regs + IMX93_ADC_MSR, msr,  in imx93_adc_calibration()
174 	if (ret == -ETIMEDOUT) {  in imx93_adc_calibration()
175 		dev_warn(adc->dev, "ADC do not finish calibration in 2 min!\n");  in imx93_adc_calibration()
176 		imx93_adc_power_down(adc);  in imx93_adc_calibration()
181 	msr = readl(adc->regs + IMX93_ADC_MSR);  in imx93_adc_calibration()
183 		dev_warn(adc->dev, "ADC calibration failed!\n");  in imx93_adc_calibration()
184 		imx93_adc_power_down(adc);  in imx93_adc_calibration()
185 		return -EAGAIN;  in imx93_adc_calibration()
191 static int imx93_adc_read_channel_conversion(struct imx93_adc *adc,  in imx93_adc_read_channel_conversion()  argument
199 	reinit_completion(&adc->completion);  in imx93_adc_read_channel_conversion()
203 	writel(channel, adc->regs + IMX93_ADC_NCMR0);  in imx93_adc_read_channel_conversion()
209 	writel(imr, adc->regs + IMX93_ADC_IMR);  in imx93_adc_read_channel_conversion()
210 	writel(channel, adc->regs + IMX93_ADC_CIMR0);  in imx93_adc_read_channel_conversion()
212 	/* config one-shot mode */  in imx93_adc_read_channel_conversion()
213 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
215 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
218 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
220 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
222 	ret = wait_for_completion_interruptible_timeout(&adc->completion,  in imx93_adc_read_channel_conversion()
225 		return -ETIMEDOUT;  in imx93_adc_read_channel_conversion()
230 	pcda = readl(adc->regs + IMX93_ADC_PCDR0 + channel_number * 4);  in imx93_adc_read_channel_conversion()
241 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_read_raw()  local
242 	struct device *dev = adc->dev;  in imx93_adc_read_raw()
248 		mutex_lock(&adc->lock);  in imx93_adc_read_raw()
249 		ret = imx93_adc_read_channel_conversion(adc, chan->channel, val);  in imx93_adc_read_raw()
250 		mutex_unlock(&adc->lock);  in imx93_adc_read_raw()
259 		ret = regulator_get_voltage(adc->vref);  in imx93_adc_read_raw()
267 		*val = clk_get_rate(adc->ipg_clk);  in imx93_adc_read_raw()
271 		return -EINVAL;  in imx93_adc_read_raw()
277 	struct imx93_adc *adc = dev_id;  in imx93_adc_isr()  local
280 	isr = readl(adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
284 		writel(eoc, adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
285 		complete(&adc->completion);  in imx93_adc_isr()
290 		writel(unexpected, adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
291 		dev_err(adc->dev, "Unexpected interrupt 0x%08x.\n", unexpected);  in imx93_adc_isr()
304 	struct imx93_adc *adc;  in imx93_adc_probe()  local
306 	struct device *dev = &pdev->dev;  in imx93_adc_probe()
309 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));  in imx93_adc_probe()
311 		return dev_err_probe(dev, -ENOMEM,  in imx93_adc_probe()
314 	adc = iio_priv(indio_dev);  in imx93_adc_probe()
315 	adc->dev = dev;  in imx93_adc_probe()
317 	mutex_init(&adc->lock);  in imx93_adc_probe()
318 	adc->regs = devm_platform_ioremap_resource(pdev, 0);  in imx93_adc_probe()
319 	if (IS_ERR(adc->regs))  in imx93_adc_probe()
320 		return dev_err_probe(dev, PTR_ERR(adc->regs),  in imx93_adc_probe()
323 	/* The third irq is for ADC conversion usage */  in imx93_adc_probe()
324 	adc->irq = platform_get_irq(pdev, 2);  in imx93_adc_probe()
325 	if (adc->irq < 0)  in imx93_adc_probe()
326 		return adc->irq;  in imx93_adc_probe()
328 	adc->ipg_clk = devm_clk_get(dev, "ipg");  in imx93_adc_probe()
329 	if (IS_ERR(adc->ipg_clk))  in imx93_adc_probe()
330 		return dev_err_probe(dev, PTR_ERR(adc->ipg_clk),  in imx93_adc_probe()
333 	adc->vref = devm_regulator_get(dev, "vref");  in imx93_adc_probe()
334 	if (IS_ERR(adc->vref))  in imx93_adc_probe()
335 		return dev_err_probe(dev, PTR_ERR(adc->vref),  in imx93_adc_probe()
338 	ret = regulator_enable(adc->vref);  in imx93_adc_probe()
345 	init_completion(&adc->completion);  in imx93_adc_probe()
347 	indio_dev->name = "imx93-adc";  in imx93_adc_probe()
348 	indio_dev->info = &imx93_adc_iio_info;  in imx93_adc_probe()
349 	indio_dev->modes = INDIO_DIRECT_MODE;  in imx93_adc_probe()
350 	indio_dev->channels = imx93_adc_iio_channels;  in imx93_adc_probe()
351 	indio_dev->num_channels = ARRAY_SIZE(imx93_adc_iio_channels);  in imx93_adc_probe()
353 	ret = clk_prepare_enable(adc->ipg_clk);  in imx93_adc_probe()
360 	ret = request_irq(adc->irq, imx93_adc_isr, 0, IMX93_ADC_DRIVER_NAME, adc);  in imx93_adc_probe()
363 			      "Failed requesting irq, irq = %d\n", adc->irq);  in imx93_adc_probe()
367 	ret = imx93_adc_calibration(adc);  in imx93_adc_probe()
371 	imx93_adc_config_ad_clk(adc);  in imx93_adc_probe()
388 	imx93_adc_power_down(adc);  in imx93_adc_probe()
390 	free_irq(adc->irq, adc);  in imx93_adc_probe()
392 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_probe()
394 	regulator_disable(adc->vref);  in imx93_adc_probe()
402 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_remove()  local
403 	struct device *dev = adc->dev;  in imx93_adc_remove()
405 	/* adc power down need clock on */  in imx93_adc_remove()
413 	imx93_adc_power_down(adc);  in imx93_adc_remove()
414 	free_irq(adc->irq, adc);  in imx93_adc_remove()
415 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_remove()
416 	regulator_disable(adc->vref);  in imx93_adc_remove()
422 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_runtime_suspend()  local
424 	imx93_adc_power_down(adc);  in imx93_adc_runtime_suspend()
425 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_runtime_suspend()
426 	regulator_disable(adc->vref);  in imx93_adc_runtime_suspend()
434 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_runtime_resume()  local
437 	ret = regulator_enable(adc->vref);  in imx93_adc_runtime_resume()
440 			"Can't enable adc reference top voltage, err = %d\n",  in imx93_adc_runtime_resume()
445 	ret = clk_prepare_enable(adc->ipg_clk);  in imx93_adc_runtime_resume()
451 	imx93_adc_power_up(adc);  in imx93_adc_runtime_resume()
456 	regulator_disable(adc->vref);  in imx93_adc_runtime_resume()
466 	{ .compatible = "nxp,imx93-adc", },
483 MODULE_DESCRIPTION("NXP i.MX93 ADC driver");