1 // SPDX-License-Identifier: GPL-2.0
3 * Intel PCH pinctrl/GPIO driver
5 * Copyright (C) 2021-2023, Intel Corporation
6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
9 #include <linux/mod_devicetable.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
13 #include <linux/property.h>
14 #include <linux/string_helpers.h>
16 #include <linux/pinctrl/pinctrl.h>
18 #include "pinctrl-intel.h"
20 struct intel_platform_pins {
21 struct pinctrl_pin_desc *pins;
25 static int intel_platform_pinctrl_prepare_pins(struct device *dev, size_t base,
26 const char *name, u32 size,
27 struct intel_platform_pins *pins)
29 struct pinctrl_pin_desc *descs;
33 pin_names = devm_kasprintf_strarray(dev, name, size);
34 if (IS_ERR(pin_names))
35 return PTR_ERR(pin_names);
37 descs = devm_krealloc_array(dev, pins->pins, base + size, sizeof(*descs), GFP_KERNEL);
41 for (i = 0; i < size; i++) {
42 unsigned int pin_number = base + i;
43 char *pin_name = pin_names[i];
44 struct pinctrl_pin_desc *desc;
46 /* Unify delimiter for pin name */
47 strreplace(pin_name, '-', '_');
49 desc = &descs[pin_number];
50 desc->number = pin_number;
51 desc->name = pin_name;
55 pins->npins = base + size;
60 static int intel_platform_pinctrl_prepare_group(struct device *dev,
61 struct fwnode_handle *child,
62 struct intel_padgroup *gpp,
63 struct intel_platform_pins *pins)
65 size_t base = pins->npins;
70 ret = fwnode_property_read_string(child, "intc-gpio-group-name", &name);
74 ret = fwnode_property_read_u32(child, "intc-gpio-pad-count", &size);
78 ret = intel_platform_pinctrl_prepare_pins(dev, base, name, size, pins);
84 gpp->gpio_base = INTEL_GPIO_BASE_MATCH;
89 static int intel_platform_pinctrl_prepare_community(struct device *dev,
90 struct intel_community *community,
91 struct intel_platform_pins *pins)
93 struct fwnode_handle *child;
94 struct intel_padgroup *gpps;
100 ret = device_property_read_u32(dev, "intc-gpio-pad-ownership-offset", &offset);
103 community->padown_offset = offset;
105 ret = device_property_read_u32(dev, "intc-gpio-pad-configuration-lock-offset", &offset);
108 community->padcfglock_offset = offset;
110 ret = device_property_read_u32(dev, "intc-gpio-host-software-pad-ownership-offset", &offset);
113 community->hostown_offset = offset;
115 ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-status-offset", &offset);
118 community->is_offset = offset;
120 ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-enable-offset", &offset);
123 community->ie_offset = offset;
125 ngpps = device_get_child_node_count(dev);
129 gpps = devm_kcalloc(dev, ngpps, sizeof(*gpps), GFP_KERNEL);
134 device_for_each_child_node(dev, child) {
135 struct intel_padgroup *gpp = &gpps[group];
137 gpp->reg_num = group;
139 ret = intel_platform_pinctrl_prepare_group(dev, child, gpp, pins);
146 community->ngpps = ngpps;
147 community->gpps = gpps;
152 static int intel_platform_pinctrl_prepare_soc_data(struct device *dev,
153 struct intel_pinctrl_soc_data *data)
155 struct intel_platform_pins pins = {};
156 struct intel_community *communities;
161 /* Version 1.0 of the specification assumes only a single community per device node */
163 communities = devm_kcalloc(dev, ncommunities, sizeof(*communities), GFP_KERNEL);
167 for (i = 0; i < ncommunities; i++) {
168 struct intel_community *community = &communities[i];
170 community->barno = i;
171 community->pin_base = pins.npins;
173 ret = intel_platform_pinctrl_prepare_community(dev, community, &pins);
177 community->npins = pins.npins - community->pin_base;
180 data->ncommunities = ncommunities;
181 data->communities = communities;
183 data->npins = pins.npins;
184 data->pins = pins.pins;
189 static int intel_platform_pinctrl_probe(struct platform_device *pdev)
191 struct intel_pinctrl_soc_data *data;
192 struct device *dev = &pdev->dev;
195 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
199 ret = intel_platform_pinctrl_prepare_soc_data(dev, data);
203 return intel_pinctrl_probe(pdev, data);
206 static const struct acpi_device_id intel_platform_pinctrl_acpi_match[] = {
210 MODULE_DEVICE_TABLE(acpi, intel_platform_pinctrl_acpi_match);
212 static struct platform_driver intel_platform_pinctrl_driver = {
213 .probe = intel_platform_pinctrl_probe,
215 .name = "intel-pinctrl",
216 .acpi_match_table = intel_platform_pinctrl_acpi_match,
217 .pm = pm_sleep_ptr(&intel_pinctrl_pm_ops),
220 module_platform_driver(intel_platform_pinctrl_driver);
222 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
223 MODULE_DESCRIPTION("Intel PCH pinctrl/GPIO driver");
224 MODULE_LICENSE("GPL v2");
225 MODULE_IMPORT_NS(PINCTRL_INTEL);