1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Freescale Vybrid vf610 ADC driver
31 #define DRIVER_NAME "vf610-adc"
33 /* Vybrid/IMX ADC registers */
189 	struct vf610_adc_feature *adc_feature = &info->adc_feature;  in vf610_adc_calculate_rates()
190 	unsigned long adck_rate, ipg_rate = clk_get_rate(info->clk);  in vf610_adc_calculate_rates()
194 	adck_rate = info->max_adck_rate[adc_feature->conv_mode];  in vf610_adc_calculate_rates()
199 		adc_feature->clk_div = 1 << fls(divisor + 1);  in vf610_adc_calculate_rates()
201 		/* fall-back value using a safe divisor */  in vf610_adc_calculate_rates()
202 		adc_feature->clk_div = 8;  in vf610_adc_calculate_rates()
205 	adck_rate = ipg_rate / adc_feature->clk_div;  in vf610_adc_calculate_rates()
212 	lst_addr_min = adc_feature->default_sample_time / adck_period;  in vf610_adc_calculate_rates()
215 			adc_feature->lst_adder_index = i;  in vf610_adc_calculate_rates()
221 	 * Calculate ADC sample frequencies  in vf610_adc_calculate_rates()
225 	 * ADC conversion time = SFCAdder + AverageNum x (BCT + LSTAdder)  in vf610_adc_calculate_rates()
232 		info->sample_freq_avail[i] =  in vf610_adc_calculate_rates()
234 			 (25 + vf610_lst_adder[adc_feature->lst_adder_index]));  in vf610_adc_calculate_rates()
239 	struct vf610_adc_feature *adc_feature = &info->adc_feature;  in vf610_adc_cfg_init()
241 	/* set default Configuration for ADC controller */  in vf610_adc_cfg_init()
242 	adc_feature->clk_sel = VF610_ADCIOC_BUSCLK_SET;  in vf610_adc_cfg_init()
243 	adc_feature->vol_ref = VF610_ADCIOC_VR_VREF_SET;  in vf610_adc_cfg_init()
245 	adc_feature->calibration = true;  in vf610_adc_cfg_init()
246 	adc_feature->ovwren = true;  in vf610_adc_cfg_init()
248 	adc_feature->res_mode = 12;  in vf610_adc_cfg_init()
249 	adc_feature->sample_rate = 1;  in vf610_adc_cfg_init()
251 	adc_feature->conv_mode = VF610_ADC_CONV_LOW_POWER;  in vf610_adc_cfg_init()
258 	struct vf610_adc_feature *adc_feature = &info->adc_feature;  in vf610_adc_cfg_post_set()
262 	switch (adc_feature->clk_sel) {  in vf610_adc_cfg_post_set()
280 	switch (adc_feature->vol_ref) {  in vf610_adc_cfg_post_set()
290 		dev_err(info->dev, "error voltage reference\n");  in vf610_adc_cfg_post_set()
294 	if (adc_feature->ovwren)  in vf610_adc_cfg_post_set()
297 	writel(cfg_data, info->regs + VF610_REG_ADC_CFG);  in vf610_adc_cfg_post_set()
298 	writel(gc_data, info->regs + VF610_REG_ADC_GC);  in vf610_adc_cfg_post_set()
305 	if (!info->adc_feature.calibration)  in vf610_adc_calibration()
310 	writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);  in vf610_adc_calibration()
312 	adc_gc = readl(info->regs + VF610_REG_ADC_GC);  in vf610_adc_calibration()
313 	writel(adc_gc | VF610_ADC_CAL, info->regs + VF610_REG_ADC_GC);  in vf610_adc_calibration()
315 	if (!wait_for_completion_timeout(&info->completion, VF610_ADC_TIMEOUT))  in vf610_adc_calibration()
316 		dev_err(info->dev, "Timeout for adc calibration\n");  in vf610_adc_calibration()
318 	adc_gc = readl(info->regs + VF610_REG_ADC_GS);  in vf610_adc_calibration()
320 		dev_err(info->dev, "ADC calibration failed\n");  in vf610_adc_calibration()
322 	info->adc_feature.calibration = false;  in vf610_adc_calibration()
327 	struct vf610_adc_feature *adc_feature = &(info->adc_feature);  in vf610_adc_cfg_set()
330 	cfg_data = readl(info->regs + VF610_REG_ADC_CFG);  in vf610_adc_cfg_set()
333 	if (adc_feature->conv_mode == VF610_ADC_CONV_LOW_POWER)  in vf610_adc_cfg_set()
337 	if (adc_feature->conv_mode == VF610_ADC_CONV_HIGH_SPEED)  in vf610_adc_cfg_set()
340 	writel(cfg_data, info->regs + VF610_REG_ADC_CFG);  in vf610_adc_cfg_set()
345 	struct vf610_adc_feature *adc_feature = &(info->adc_feature);  in vf610_adc_sample_set()
348 	cfg_data = readl(info->regs + VF610_REG_ADC_CFG);  in vf610_adc_sample_set()
349 	gc_data = readl(info->regs + VF610_REG_ADC_GC);  in vf610_adc_sample_set()
353 	switch (adc_feature->res_mode) {  in vf610_adc_sample_set()
364 		dev_err(info->dev, "error resolution mode\n");  in vf610_adc_sample_set()
370 	switch (adc_feature->clk_div) {  in vf610_adc_sample_set()
383 		switch (adc_feature->clk_sel) {  in vf610_adc_sample_set()
388 			dev_err(info->dev, "error clk divider\n");  in vf610_adc_sample_set()
398 	switch (adc_feature->lst_adder_index) {  in vf610_adc_sample_set()
426 		dev_err(info->dev, "error in sample time select\n");  in vf610_adc_sample_set()
432 	switch (adc_feature->sample_rate) {  in vf610_adc_sample_set()
451 		dev_err(info->dev,  in vf610_adc_sample_set()
455 	writel(cfg_data, info->regs + VF610_REG_ADC_CFG);  in vf610_adc_sample_set()
456 	writel(gc_data, info->regs + VF610_REG_ADC_GC);  in vf610_adc_sample_set()
465 	/* adc calibration */  in vf610_adc_hw_init()
478 	mutex_lock(&info->lock);  in vf610_set_conversion_mode()
479 	info->adc_feature.conv_mode = mode;  in vf610_set_conversion_mode()
482 	mutex_unlock(&info->lock);  in vf610_set_conversion_mode()
492 	return info->adc_feature.conv_mode;  in vf610_get_conversion_mode()
495 static const char * const vf610_conv_modes[] = { "normal", "high-speed",
496 						 "low-power" };
564 	result = readl(info->regs + VF610_REG_ADC_R0);  in vf610_adc_read_data()
566 	switch (info->adc_feature.res_mode) {  in vf610_adc_read_data()
589 	coco = readl(info->regs + VF610_REG_ADC_HS);  in vf610_adc_isr()
591 		info->value = vf610_adc_read_data(info);  in vf610_adc_isr()
593 			info->scan.chan = info->value;  in vf610_adc_isr()
595 					&info->scan,  in vf610_adc_isr()
597 			iio_trigger_notify_done(indio_dev->trig);  in vf610_adc_isr()
599 			complete(&info->completion);  in vf610_adc_isr()
612 	for (i = 0; i < ARRAY_SIZE(info->sample_freq_avail); i++)  in vf610_show_samp_freq_avail()
613 		len += scnprintf(buf + len, PAGE_SIZE - len,  in vf610_show_samp_freq_avail()
614 			"%u ", info->sample_freq_avail[i]);  in vf610_show_samp_freq_avail()
617 	buf[len - 1] = '\n';  in vf610_show_samp_freq_avail()
644 	mutex_lock(&info->lock);  in vf610_read_sample()
645 	reinit_completion(&info->completion);  in vf610_read_sample()
646 	hc_cfg = VF610_ADC_ADCHC(chan->channel);  in vf610_read_sample()
648 	writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);  in vf610_read_sample()
649 	ret = wait_for_completion_interruptible_timeout(&info->completion,  in vf610_read_sample()
652 		ret = -ETIMEDOUT;  in vf610_read_sample()
659 	switch (chan->type) {  in vf610_read_sample()
661 		*val = info->value;  in vf610_read_sample()
669 		*val = 25000 - ((int)info->value - VF610_VTEMP25_3V3) *  in vf610_read_sample()
674 		ret = -EINVAL;  in vf610_read_sample()
679 	mutex_unlock(&info->lock);  in vf610_read_sample()
704 		*val = info->vref_uv / 1000;  in vf610_read_raw()
705 		*val2 = info->adc_feature.res_mode;  in vf610_read_raw()
709 		*val = info->sample_freq_avail[info->adc_feature.sample_rate];  in vf610_read_raw()
717 	return -EINVAL;  in vf610_read_raw()
732 			i < ARRAY_SIZE(info->sample_freq_avail);  in vf610_write_raw()
734 			if (val == info->sample_freq_avail[i]) {  in vf610_write_raw()
735 				info->adc_feature.sample_rate = i;  in vf610_write_raw()
745 	return -EINVAL;  in vf610_write_raw()
754 	val = readl(info->regs + VF610_REG_ADC_GC);  in vf610_adc_buffer_postenable()
756 	writel(val, info->regs + VF610_REG_ADC_GC);  in vf610_adc_buffer_postenable()
758 	channel = find_first_bit(indio_dev->active_scan_mask,  in vf610_adc_buffer_postenable()
764 	writel(val, info->regs + VF610_REG_ADC_HC0);  in vf610_adc_buffer_postenable()
775 	val = readl(info->regs + VF610_REG_ADC_GC);  in vf610_adc_buffer_predisable()
777 	writel(val, info->regs + VF610_REG_ADC_GC);  in vf610_adc_buffer_predisable()
782 	writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);  in vf610_adc_buffer_predisable()
801 		return -EINVAL;  in vf610_adc_reg_access()
803 	*readval = readl(info->regs + reg);  in vf610_adc_reg_access()
824 	{ .compatible = "fsl,imx6sx-adc", .data = &imx6sx_chip_info},
825 	{ .compatible = "fsl,vf610-adc", .data = &vf610_chip_info},
834 	regulator_disable(info->vref);  in vf610_adc_action_remove()
840 	struct device *dev = &pdev->dev;  in vf610_adc_probe()
846 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct vf610_adc));  in vf610_adc_probe()
848 		return dev_err_probe(&pdev->dev, -ENOMEM, "Failed allocating iio device\n");  in vf610_adc_probe()
851 	info->dev = &pdev->dev;  in vf610_adc_probe()
853 	info->regs = devm_platform_ioremap_resource(pdev, 0);  in vf610_adc_probe()
854 	if (IS_ERR(info->regs))  in vf610_adc_probe()
855 		return PTR_ERR(info->regs);  in vf610_adc_probe()
863 	ret = devm_request_irq(info->dev, irq,  in vf610_adc_probe()
865 				dev_name(&pdev->dev), indio_dev);  in vf610_adc_probe()
867 		return dev_err_probe(&pdev->dev, ret, "failed requesting irq, irq = %d\n", irq);  in vf610_adc_probe()
869 	info->clk = devm_clk_get_enabled(&pdev->dev, "adc");  in vf610_adc_probe()
870 	if (IS_ERR(info->clk))  in vf610_adc_probe()
871 		return dev_err_probe(&pdev->dev, PTR_ERR(info->clk), "failed getting clock\n");  in vf610_adc_probe()
873 	info->vref = devm_regulator_get(&pdev->dev, "vref");  in vf610_adc_probe()
874 	if (IS_ERR(info->vref))  in vf610_adc_probe()
875 		return PTR_ERR(info->vref);  in vf610_adc_probe()
877 	ret = regulator_enable(info->vref);  in vf610_adc_probe()
881 	ret = devm_add_action_or_reset(&pdev->dev, vf610_adc_action_remove, info);  in vf610_adc_probe()
885 	info->vref_uv = regulator_get_voltage(info->vref);  in vf610_adc_probe()
887 	device_property_read_u32_array(dev, "fsl,adck-max-frequency", info->max_adck_rate, 3);  in vf610_adc_probe()
889 	info->adc_feature.default_sample_time = DEFAULT_SAMPLE_TIME;  in vf610_adc_probe()
890 	device_property_read_u32(dev, "min-sample-time", &info->adc_feature.default_sample_time);  in vf610_adc_probe()
894 	init_completion(&info->completion);  in vf610_adc_probe()
896 	indio_dev->name = dev_name(&pdev->dev);  in vf610_adc_probe()
897 	indio_dev->info = &vf610_adc_iio_info;  in vf610_adc_probe()
898 	indio_dev->modes = INDIO_DIRECT_MODE;  in vf610_adc_probe()
899 	indio_dev->channels = vf610_adc_iio_channels;  in vf610_adc_probe()
900 	indio_dev->num_channels = chip_info->num_channels;  in vf610_adc_probe()
905 	ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev, &iio_pollfunc_store_time,  in vf610_adc_probe()
908 		return dev_err_probe(&pdev->dev, ret, "Couldn't initialise the buffer\n");  in vf610_adc_probe()
910 	mutex_init(&info->lock);  in vf610_adc_probe()
912 	ret = devm_iio_device_register(&pdev->dev, indio_dev);  in vf610_adc_probe()
914 		return dev_err_probe(&pdev->dev, ret, "Couldn't register the device.\n");  in vf610_adc_probe()
925 	/* ADC controller enters to stop mode */  in vf610_adc_suspend()
926 	hc_cfg = readl(info->regs + VF610_REG_ADC_HC0);  in vf610_adc_suspend()
928 	writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);  in vf610_adc_suspend()
930 	clk_disable_unprepare(info->clk);  in vf610_adc_suspend()
931 	regulator_disable(info->vref);  in vf610_adc_suspend()
942 	ret = regulator_enable(info->vref);  in vf610_adc_resume()
946 	ret = clk_prepare_enable(info->clk);  in vf610_adc_resume()
955 	regulator_disable(info->vref);  in vf610_adc_resume()
974 MODULE_DESCRIPTION("Freescale VF610 ADC driver");