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