diff options
Diffstat (limited to 'drivers/pinctrl/intel/pinctrl-intel-platform.c')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel-platform.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel-platform.c b/drivers/pinctrl/intel/pinctrl-intel-platform.c new file mode 100644 index 0000000000..4a19ab3b4b --- /dev/null +++ b/drivers/pinctrl/intel/pinctrl-intel-platform.c @@ -0,0 +1,225 @@ +// 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 fwnode_handle *child; + 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(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); |