1 // SPDX-License-Identifier: GPL-2.0-only
3  * Analog Devices Generic AXI ADC IP core
6  * Copyright 2012-2020 Analog Devices Inc.
10 #include <linux/clk.h>
21 #include <linux/fpga/adi-axi-common.h>
24 #include <linux/iio/buffer-dmaengine.h>
33 /* ADC controls */
40 /* ADC Channel controls */
69 	ret = regmap_set_bits(st->regmap, ADI_AXI_REG_RSTN,  in axi_adc_enable()
75 	return regmap_set_bits(st->regmap, ADI_AXI_REG_RSTN,  in axi_adc_enable()
83 	regmap_write(st->regmap, ADI_AXI_REG_RSTN, 0);  in axi_adc_disable()
92 	if (!data->enable)  in axi_adc_data_format_set()
93 		return regmap_clear_bits(st->regmap,  in axi_adc_data_format_set()
98 	if (data->sign_extend)  in axi_adc_data_format_set()
100 	if (data->type == IIO_BACKEND_OFFSET_BINARY)  in axi_adc_data_format_set()
103 	return regmap_update_bits(st->regmap, ADI_AXI_REG_CHAN_CTRL(chan),  in axi_adc_data_format_set()
111 	return regmap_set_bits(st->regmap, ADI_AXI_REG_CHAN_CTRL(chan),  in axi_adc_chan_enable()
119 	return regmap_clear_bits(st->regmap, ADI_AXI_REG_CHAN_CTRL(chan),  in axi_adc_chan_disable()
131 	if (device_property_read_string(st->dev, "dma-names", &dma_name))  in axi_adc_request_buffer()
134 	buffer = iio_dmaengine_buffer_alloc(st->dev, dma_name);  in axi_adc_request_buffer()
136 		dev_err(st->dev, "Could not get DMA buffer, %ld\n",  in axi_adc_request_buffer()
141 	indio_dev->modes |= INDIO_BUFFER_HARDWARE;  in axi_adc_request_buffer()
178 	struct clk *clk;  in adi_axi_adc_probe()  local
181 	st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);  in adi_axi_adc_probe()
183 		return -ENOMEM;  in adi_axi_adc_probe()
189 	st->dev = &pdev->dev;  in adi_axi_adc_probe()
190 	st->regmap = devm_regmap_init_mmio(&pdev->dev, base,  in adi_axi_adc_probe()
192 	if (IS_ERR(st->regmap))  in adi_axi_adc_probe()
193 		return PTR_ERR(st->regmap);  in adi_axi_adc_probe()
195 	expected_ver = device_get_match_data(&pdev->dev);  in adi_axi_adc_probe()
197 		return -ENODEV;  in adi_axi_adc_probe()
199 	clk = devm_clk_get_enabled(&pdev->dev, NULL);  in adi_axi_adc_probe()
200 	if (IS_ERR(clk))  in adi_axi_adc_probe()
201 		return PTR_ERR(clk);  in adi_axi_adc_probe()
207 	ret = regmap_write(st->regmap, ADI_AXI_REG_RSTN, 0);  in adi_axi_adc_probe()
211 	ret = regmap_read(st->regmap, ADI_AXI_REG_VERSION, &ver);  in adi_axi_adc_probe()
216 		dev_err(&pdev->dev,  in adi_axi_adc_probe()
224 		return -ENODEV;  in adi_axi_adc_probe()
227 	ret = devm_iio_backend_register(&pdev->dev, &adi_axi_adc_generic, st);  in adi_axi_adc_probe()
231 	dev_info(&pdev->dev, "AXI ADC IP core (%d.%.2d.%c) probed\n",  in adi_axi_adc_probe()
243 	{ .compatible = "adi,axi-adc-10.0.a", .data = &adi_axi_adc_10_0_a_info },
258 MODULE_DESCRIPTION("Analog Devices Generic AXI ADC IP core driver");