226 lines
5.3 KiB
C
226 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel PCH pinctrl/GPIO driver
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*
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* Copyright (C) 2021-2023, Intel Corporation
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*/
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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/pm.h>
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#include <linux/property.h>
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#include <linux/string_helpers.h>
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#include <linux/pinctrl/pinctrl.h>
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#include "pinctrl-intel.h"
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struct intel_platform_pins {
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struct pinctrl_pin_desc *pins;
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size_t npins;
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};
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static int intel_platform_pinctrl_prepare_pins(struct device *dev, size_t base,
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const char *name, u32 size,
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struct intel_platform_pins *pins)
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{
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struct pinctrl_pin_desc *descs;
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char **pin_names;
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unsigned int i;
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pin_names = devm_kasprintf_strarray(dev, name, size);
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if (IS_ERR(pin_names))
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return PTR_ERR(pin_names);
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descs = devm_krealloc_array(dev, pins->pins, base + size, sizeof(*descs), GFP_KERNEL);
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if (!descs)
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return -ENOMEM;
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for (i = 0; i < size; i++) {
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unsigned int pin_number = base + i;
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char *pin_name = pin_names[i];
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struct pinctrl_pin_desc *desc;
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/* Unify delimiter for pin name */
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strreplace(pin_name, '-', '_');
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desc = &descs[pin_number];
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desc->number = pin_number;
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desc->name = pin_name;
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}
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pins->pins = descs;
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pins->npins = base + size;
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return 0;
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}
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static int intel_platform_pinctrl_prepare_group(struct device *dev,
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struct fwnode_handle *child,
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struct intel_padgroup *gpp,
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struct intel_platform_pins *pins)
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{
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size_t base = pins->npins;
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const char *name;
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u32 size;
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int ret;
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ret = fwnode_property_read_string(child, "intc-gpio-group-name", &name);
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if (ret)
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return ret;
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ret = fwnode_property_read_u32(child, "intc-gpio-pad-count", &size);
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if (ret)
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return ret;
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ret = intel_platform_pinctrl_prepare_pins(dev, base, name, size, pins);
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if (ret)
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return ret;
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gpp->base = base;
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gpp->size = size;
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gpp->gpio_base = INTEL_GPIO_BASE_MATCH;
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return 0;
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}
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static int intel_platform_pinctrl_prepare_community(struct device *dev,
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struct intel_community *community,
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struct intel_platform_pins *pins)
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{
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struct fwnode_handle *child;
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struct intel_padgroup *gpps;
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unsigned int group;
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size_t ngpps;
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u32 offset;
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int ret;
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ret = device_property_read_u32(dev, "intc-gpio-pad-ownership-offset", &offset);
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if (ret)
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return ret;
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community->padown_offset = offset;
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ret = device_property_read_u32(dev, "intc-gpio-pad-configuration-lock-offset", &offset);
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if (ret)
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return ret;
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community->padcfglock_offset = offset;
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ret = device_property_read_u32(dev, "intc-gpio-host-software-pad-ownership-offset", &offset);
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if (ret)
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return ret;
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community->hostown_offset = offset;
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ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-status-offset", &offset);
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if (ret)
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return ret;
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community->is_offset = offset;
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ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-enable-offset", &offset);
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if (ret)
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return ret;
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community->ie_offset = offset;
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ngpps = device_get_child_node_count(dev);
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if (!ngpps)
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return -ENODEV;
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gpps = devm_kcalloc(dev, ngpps, sizeof(*gpps), GFP_KERNEL);
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if (!gpps)
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return -ENOMEM;
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group = 0;
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device_for_each_child_node(dev, child) {
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struct intel_padgroup *gpp = &gpps[group];
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gpp->reg_num = group;
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ret = intel_platform_pinctrl_prepare_group(dev, child, gpp, pins);
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if (ret)
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return ret;
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group++;
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}
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community->ngpps = ngpps;
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community->gpps = gpps;
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return 0;
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}
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static int intel_platform_pinctrl_prepare_soc_data(struct device *dev,
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struct intel_pinctrl_soc_data *data)
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{
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struct intel_platform_pins pins = {};
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struct intel_community *communities;
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size_t ncommunities;
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unsigned int i;
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int ret;
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/* Version 1.0 of the specification assumes only a single community per device node */
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ncommunities = 1,
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communities = devm_kcalloc(dev, ncommunities, sizeof(*communities), GFP_KERNEL);
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if (!communities)
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return -ENOMEM;
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for (i = 0; i < ncommunities; i++) {
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struct intel_community *community = &communities[i];
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community->barno = i;
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community->pin_base = pins.npins;
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ret = intel_platform_pinctrl_prepare_community(dev, community, &pins);
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if (ret)
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return ret;
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community->npins = pins.npins - community->pin_base;
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}
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data->ncommunities = ncommunities;
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data->communities = communities;
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data->npins = pins.npins;
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data->pins = pins.pins;
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return 0;
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}
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static int intel_platform_pinctrl_probe(struct platform_device *pdev)
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{
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struct intel_pinctrl_soc_data *data;
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struct device *dev = &pdev->dev;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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ret = intel_platform_pinctrl_prepare_soc_data(dev, data);
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if (ret)
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return ret;
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return intel_pinctrl_probe(pdev, data);
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}
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static const struct acpi_device_id intel_platform_pinctrl_acpi_match[] = {
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{ "INTC105F" },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, intel_platform_pinctrl_acpi_match);
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static struct platform_driver intel_platform_pinctrl_driver = {
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.probe = intel_platform_pinctrl_probe,
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.driver = {
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.name = "intel-pinctrl",
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.acpi_match_table = intel_platform_pinctrl_acpi_match,
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.pm = pm_sleep_ptr(&intel_pinctrl_pm_ops),
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},
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};
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module_platform_driver(intel_platform_pinctrl_driver);
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MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
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MODULE_DESCRIPTION("Intel PCH pinctrl/GPIO driver");
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MODULE_LICENSE("GPL v2");
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MODULE_IMPORT_NS(PINCTRL_INTEL);
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