mirror of https://github.com/torvalds/linux.git
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Layerscape GPIO QIXIS FPGA driver
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*
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* Copyright 2025 NXP
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*/
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#include <linux/device.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio/regmap.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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struct qixis_cpld_gpio_config {
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u64 output_lines;
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};
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static const struct qixis_cpld_gpio_config lx2160ardb_sfp_cfg = {
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.output_lines = BIT(0),
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};
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static const struct qixis_cpld_gpio_config ls1046aqds_stat_pres2_cfg = {
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.output_lines = 0x0,
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};
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static const struct regmap_config regmap_config_8r_8v = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int qixis_cpld_gpio_probe(struct platform_device *pdev)
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{
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DECLARE_BITMAP(fixed_direction_output, 8);
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const struct qixis_cpld_gpio_config *cfg;
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struct gpio_regmap_config config = {0};
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struct regmap *regmap;
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void __iomem *reg;
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u32 base;
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int ret;
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if (!pdev->dev.parent)
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return -ENODEV;
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cfg = device_get_match_data(&pdev->dev);
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ret = device_property_read_u32(&pdev->dev, "reg", &base);
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if (ret)
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return ret;
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regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!regmap) {
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/* In case there is no regmap configured by the parent device,
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* create our own from the MMIO space.
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*/
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reg = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(reg))
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return PTR_ERR(reg);
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regmap = devm_regmap_init_mmio(&pdev->dev, reg, ®map_config_8r_8v);
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if (!regmap)
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return -ENODEV;
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/* In this case, the offset of our register is 0 inside the
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* regmap area that we just created.
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*/
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base = 0;
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}
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config.reg_dat_base = GPIO_REGMAP_ADDR(base);
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config.reg_set_base = GPIO_REGMAP_ADDR(base);
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config.drvdata = (void *)cfg;
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config.regmap = regmap;
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config.parent = &pdev->dev;
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config.ngpio_per_reg = 8;
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config.ngpio = 8;
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bitmap_from_u64(fixed_direction_output, cfg->output_lines);
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config.fixed_direction_output = fixed_direction_output;
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return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
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}
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static const struct of_device_id qixis_cpld_gpio_of_match[] = {
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{
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.compatible = "fsl,lx2160ardb-fpga-gpio-sfp",
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.data = &lx2160ardb_sfp_cfg,
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},
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{
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.compatible = "fsl,ls1046aqds-fpga-gpio-stat-pres2",
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.data = &ls1046aqds_stat_pres2_cfg,
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, qixis_cpld_gpio_of_match);
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static struct platform_driver qixis_cpld_gpio_driver = {
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.probe = qixis_cpld_gpio_probe,
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.driver = {
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.name = "gpio-qixis-cpld",
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.of_match_table = qixis_cpld_gpio_of_match,
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},
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};
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module_platform_driver(qixis_cpld_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ioana Ciornei <ioana.ciornei@nxp.com>");
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MODULE_DESCRIPTION("Layerscape GPIO QIXIS FPGA driver");
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