3  * NXP i.MX93 ADC driver
22 #define IMX93_ADC_DRIVER_NAME	"imx93-adc"
42 /* ADC bit shift */
61 /* ADC status */
98 static void imx93_adc_power_down(struct imx93_adc *adc)  in imx93_adc_power_down()  argument
103 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_down()
105 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_down()
107 	ret = readl_poll_timeout(adc->regs + IMX93_ADC_MSR, msr,  in imx93_adc_power_down()
112 		dev_warn(adc->dev,  in imx93_adc_power_down()
113 			 "ADC do not in power down mode, current MSR is %x\n",  in imx93_adc_power_down()
117 static void imx93_adc_power_up(struct imx93_adc *adc)  in imx93_adc_power_up()  argument
121 	/* bring ADC out of power down state, in idle state */  in imx93_adc_power_up()
122 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_up()
124 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_power_up()
127 static void imx93_adc_config_ad_clk(struct imx93_adc *adc)  in imx93_adc_config_ad_clk()  argument
131 	/* put adc in power down mode */  in imx93_adc_config_ad_clk()
132 	imx93_adc_power_down(adc);  in imx93_adc_config_ad_clk()
135 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_config_ad_clk()
137 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_config_ad_clk()
139 	imx93_adc_power_up(adc);  in imx93_adc_config_ad_clk()
142 static int imx93_adc_calibration(struct imx93_adc *adc)  in imx93_adc_calibration()  argument
147 	/* make sure ADC in power down mode */  in imx93_adc_calibration()
148 	imx93_adc_power_down(adc);  in imx93_adc_calibration()
151 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
153 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
155 	imx93_adc_power_up(adc);  in imx93_adc_calibration()
163 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
165 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_calibration()
168 	ret = readl_poll_timeout(adc->regs + IMX93_ADC_MSR, msr,  in imx93_adc_calibration()
171 		dev_warn(adc->dev, "ADC do not finish calibration in 2 min!\n");  in imx93_adc_calibration()
172 		imx93_adc_power_down(adc);  in imx93_adc_calibration()
177 	msr = readl(adc->regs + IMX93_ADC_MSR);  in imx93_adc_calibration()
179 		dev_warn(adc->dev, "ADC calibration failed!\n");  in imx93_adc_calibration()
180 		imx93_adc_power_down(adc);  in imx93_adc_calibration()
187 static int imx93_adc_read_channel_conversion(struct imx93_adc *adc,  in imx93_adc_read_channel_conversion()  argument
195 	reinit_completion(&adc->completion);  in imx93_adc_read_channel_conversion()
199 	writel(channel, adc->regs + IMX93_ADC_NCMR0);  in imx93_adc_read_channel_conversion()
205 	writel(imr, adc->regs + IMX93_ADC_IMR);  in imx93_adc_read_channel_conversion()
206 	writel(channel, adc->regs + IMX93_ADC_CIMR0);  in imx93_adc_read_channel_conversion()
209 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
211 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
214 	mcr = readl(adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
216 	writel(mcr, adc->regs + IMX93_ADC_MCR);  in imx93_adc_read_channel_conversion()
218 	ret = wait_for_completion_interruptible_timeout(&adc->completion,  in imx93_adc_read_channel_conversion()
226 	pcda = readl(adc->regs + IMX93_ADC_PCDR0 + channel_number * 4);  in imx93_adc_read_channel_conversion()
237 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_read_raw()  local
238 	struct device *dev = adc->dev;  in imx93_adc_read_raw()
244 		mutex_lock(&adc->lock);  in imx93_adc_read_raw()
245 		ret = imx93_adc_read_channel_conversion(adc, chan->channel, val);  in imx93_adc_read_raw()
246 		mutex_unlock(&adc->lock);  in imx93_adc_read_raw()
255 		ret = regulator_get_voltage(adc->vref);  in imx93_adc_read_raw()
263 		*val = clk_get_rate(adc->ipg_clk);  in imx93_adc_read_raw()
273 	struct imx93_adc *adc = dev_id;  in imx93_adc_isr()  local
276 	isr = readl(adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
280 		writel(eoc, adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
281 		complete(&adc->completion);  in imx93_adc_isr()
286 		writel(unexpected, adc->regs + IMX93_ADC_ISR);  in imx93_adc_isr()
287 		dev_err(adc->dev, "Unexpected interrupt 0x%08x.\n", unexpected);  in imx93_adc_isr()
300 	struct imx93_adc *adc;  in imx93_adc_probe()  local
305 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));  in imx93_adc_probe()
310 	adc = iio_priv(indio_dev);  in imx93_adc_probe()
311 	adc->dev = dev;  in imx93_adc_probe()
313 	mutex_init(&adc->lock);  in imx93_adc_probe()
314 	adc->regs = devm_platform_ioremap_resource(pdev, 0);  in imx93_adc_probe()
315 	if (IS_ERR(adc->regs))  in imx93_adc_probe()
316 		return dev_err_probe(dev, PTR_ERR(adc->regs),  in imx93_adc_probe()
319 	/* The third irq is for ADC conversion usage */  in imx93_adc_probe()
320 	adc->irq = platform_get_irq(pdev, 2);  in imx93_adc_probe()
321 	if (adc->irq < 0)  in imx93_adc_probe()
322 		return adc->irq;  in imx93_adc_probe()
324 	adc->ipg_clk = devm_clk_get(dev, "ipg");  in imx93_adc_probe()
325 	if (IS_ERR(adc->ipg_clk))  in imx93_adc_probe()
326 		return dev_err_probe(dev, PTR_ERR(adc->ipg_clk),  in imx93_adc_probe()
329 	adc->vref = devm_regulator_get(dev, "vref");  in imx93_adc_probe()
330 	if (IS_ERR(adc->vref))  in imx93_adc_probe()
331 		return dev_err_probe(dev, PTR_ERR(adc->vref),  in imx93_adc_probe()
334 	ret = regulator_enable(adc->vref);  in imx93_adc_probe()
341 	init_completion(&adc->completion);  in imx93_adc_probe()
343 	indio_dev->name = "imx93-adc";  in imx93_adc_probe()
349 	ret = clk_prepare_enable(adc->ipg_clk);  in imx93_adc_probe()
356 	ret = request_irq(adc->irq, imx93_adc_isr, 0, IMX93_ADC_DRIVER_NAME, adc);  in imx93_adc_probe()
359 			      "Failed requesting irq, irq = %d\n", adc->irq);  in imx93_adc_probe()
363 	ret = imx93_adc_calibration(adc);  in imx93_adc_probe()
367 	imx93_adc_config_ad_clk(adc);  in imx93_adc_probe()
384 	imx93_adc_power_down(adc);  in imx93_adc_probe()
386 	free_irq(adc->irq, adc);  in imx93_adc_probe()
388 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_probe()
390 	regulator_disable(adc->vref);  in imx93_adc_probe()
398 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_remove()  local
399 	struct device *dev = adc->dev;  in imx93_adc_remove()
401 	/* adc power down need clock on */  in imx93_adc_remove()
409 	imx93_adc_power_down(adc);  in imx93_adc_remove()
410 	free_irq(adc->irq, adc);  in imx93_adc_remove()
411 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_remove()
412 	regulator_disable(adc->vref);  in imx93_adc_remove()
420 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_runtime_suspend()  local
422 	imx93_adc_power_down(adc);  in imx93_adc_runtime_suspend()
423 	clk_disable_unprepare(adc->ipg_clk);  in imx93_adc_runtime_suspend()
424 	regulator_disable(adc->vref);  in imx93_adc_runtime_suspend()
432 	struct imx93_adc *adc = iio_priv(indio_dev);  in imx93_adc_runtime_resume()  local
435 	ret = regulator_enable(adc->vref);  in imx93_adc_runtime_resume()
438 			"Can't enable adc reference top voltage, err = %d\n",  in imx93_adc_runtime_resume()
443 	ret = clk_prepare_enable(adc->ipg_clk);  in imx93_adc_runtime_resume()
449 	imx93_adc_power_up(adc);  in imx93_adc_runtime_resume()
454 	regulator_disable(adc->vref);  in imx93_adc_runtime_resume()
464 	{ .compatible = "nxp,imx93-adc", },
481 MODULE_DESCRIPTION("NXP i.MX93 ADC driver");