drivers/pinctrl/intel/pinctrl-intel-platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Intel PCH pinctrl/GPIO driver
   4  *
   5  * Copyright (C) 2021-2023, Intel Corporation
   6  * Author: Andy Shevchenko <[email protected]>
   7  */
   8
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm.h>
  13 #include <linux/property.h>
  14 #include <linux/string_helpers.h>
  15
  16 #include <linux/pinctrl/pinctrl.h>
  17
  18 #include "pinctrl-intel.h"
  19
  20 struct intel_platform_pins {
  21         struct pinctrl_pin_desc *pins;
  22         size_t npins;
  23 };
  24
  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)
  28 {
  29         struct pinctrl_pin_desc *descs;
  30         char **pin_names;
  31         unsigned int i;
  32
  33         pin_names = devm_kasprintf_strarray(dev, name, size);
  34         if (IS_ERR(pin_names))
  35                 return PTR_ERR(pin_names);
  36
  37         descs = devm_krealloc_array(dev, pins->pins, base + size, sizeof(*descs), GFP_KERNEL);
  38         if (!descs)
  39                 return -ENOMEM;
  40
  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;
  45
  46                 /* Unify delimiter for pin name */
  47                 strreplace(pin_name, '-', '_');
  48
  49                 desc = &descs[pin_number];
  50                 desc->number = pin_number;
  51                 desc->name = pin_name;
  52         }
  53
  54         pins->pins = descs;
  55         pins->npins = base + size;
  56
  57         return 0;
  58 }
  59
  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)
  64 {
  65         size_t base = pins->npins;
  66         const char *name;
  67         u32 size;
  68         int ret;
  69
  70         ret = fwnode_property_read_string(child, "intc-gpio-group-name", &name);
  71         if (ret)
  72                 return ret;
  73
  74         ret = fwnode_property_read_u32(child, "intc-gpio-pad-count", &size);
  75         if (ret)
  76                 return ret;
  77
  78         ret = intel_platform_pinctrl_prepare_pins(dev, base, name, size, pins);
  79         if (ret)
  80                 return ret;
  81
  82         gpp->base = base;
  83         gpp->size = size;
  84         gpp->gpio_base = INTEL_GPIO_BASE_MATCH;
  85
  86         return 0;
  87 }
  88
  89 static int intel_platform_pinctrl_prepare_community(struct device *dev,
  90                                                     struct intel_community *community,
  91                                                     struct intel_platform_pins *pins)
  92 {
  93         struct intel_padgroup *gpps;
  94         unsigned int group;
  95         size_t ngpps;
  96         u32 offset;
  97         int ret;
  98
  99         ret = device_property_read_u32(dev, "intc-gpio-pad-ownership-offset", &offset);
 100         if (ret)
 101                 return ret;
 102         community->padown_offset = offset;
 103
 104         ret = device_property_read_u32(dev, "intc-gpio-pad-configuration-lock-offset", &offset);
 105         if (ret)
 106                 return ret;
 107         community->padcfglock_offset = offset;
 108
 109         ret = device_property_read_u32(dev, "intc-gpio-host-software-pad-ownership-offset", &offset);
 110         if (ret)
 111                 return ret;
 112         community->hostown_offset = offset;
 113
 114         ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-status-offset", &offset);
 115         if (ret)
 116                 return ret;
 117         community->is_offset = offset;
 118
 119         ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-enable-offset", &offset);
 120         if (ret)
 121                 return ret;
 122         community->ie_offset = offset;
 123
 124         ngpps = device_get_child_node_count(dev);
 125         if (!ngpps)
 126                 return -ENODEV;
 127
 128         gpps = devm_kcalloc(dev, ngpps, sizeof(*gpps), GFP_KERNEL);
 129         if (!gpps)
 130                 return -ENOMEM;
 131
 132         group = 0;
 133         device_for_each_child_node_scoped(dev, child) {
 134                 struct intel_padgroup *gpp = &gpps[group];
 135
 136                 gpp->reg_num = group;
 137
 138                 ret = intel_platform_pinctrl_prepare_group(dev, child, gpp, pins);
 139                 if (ret)
 140                         return ret;
 141
 142                 group++;
 143         }
 144
 145         community->ngpps = ngpps;
 146         community->gpps = gpps;
 147
 148         return 0;
 149 }
 150
 151 static int intel_platform_pinctrl_prepare_soc_data(struct device *dev,
 152                                                    struct intel_pinctrl_soc_data *data)
 153 {
 154         struct intel_platform_pins pins = {};
 155         struct intel_community *communities;
 156         size_t ncommunities;
 157         unsigned int i;
 158         int ret;
 159
 160         /* Version 1.0 of the specification assumes only a single community per device node */
 161         ncommunities = 1;
 162         communities = devm_kcalloc(dev, ncommunities, sizeof(*communities), GFP_KERNEL);
 163         if (!communities)
 164                 return -ENOMEM;
 165
 166         for (i = 0; i < ncommunities; i++) {
 167                 struct intel_community *community = &communities[i];
 168
 169                 community->barno = i;
 170                 community->pin_base = pins.npins;
 171
 172                 ret = intel_platform_pinctrl_prepare_community(dev, community, &pins);
 173                 if (ret)
 174                         return ret;
 175
 176                 community->npins = pins.npins - community->pin_base;
 177         }
 178
 179         data->ncommunities = ncommunities;
 180         data->communities = communities;
 181
 182         data->npins = pins.npins;
 183         data->pins = pins.pins;
 184
 185         return 0;
 186 }
 187
 188 static int intel_platform_pinctrl_probe(struct platform_device *pdev)
 189 {
 190         struct intel_pinctrl_soc_data *data;
 191         struct device *dev = &pdev->dev;
 192         int ret;
 193
 194         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 195         if (!data)
 196                 return -ENOMEM;
 197
 198         ret = intel_platform_pinctrl_prepare_soc_data(dev, data);
 199         if (ret)
 200                 return ret;
 201
 202         return intel_pinctrl_probe(pdev, data);
 203 }
 204
 205 static const struct acpi_device_id intel_platform_pinctrl_acpi_match[] = {
 206         { "INTC105F" },
 207         { }
 208 };
 209 MODULE_DEVICE_TABLE(acpi, intel_platform_pinctrl_acpi_match);
 210
 211 static struct platform_driver intel_platform_pinctrl_driver = {
 212         .probe = intel_platform_pinctrl_probe,
 213         .driver = {
 214                 .name = "intel-pinctrl",
 215                 .acpi_match_table = intel_platform_pinctrl_acpi_match,
 216                 .pm = pm_sleep_ptr(&intel_pinctrl_pm_ops),
 217         },
 218 };
 219 module_platform_driver(intel_platform_pinctrl_driver);
 220
 221 MODULE_AUTHOR("Andy Shevchenko <[email protected]>");
 222 MODULE_DESCRIPTION("Intel PCH pinctrl/GPIO driver");
 223 MODULE_LICENSE("GPL v2");
 224 MODULE_IMPORT_NS("PINCTRL_INTEL");