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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/module.h>
10#include <linux/platform_device.h>
11#include <linux/pm.h>
12#include <linux/property.h>
13#include <linux/string_helpers.h>
14
15#include <linux/pinctrl/pinctrl.h>
16
17#include "pinctrl-intel.h"
18
19struct intel_platform_pins {
20 struct pinctrl_pin_desc *pins;
21 size_t npins;
22};
23
24static int intel_platform_pinctrl_prepare_pins(struct device *dev, size_t base,
25 const char *name, u32 size,
26 struct intel_platform_pins *pins)
27{
28 struct pinctrl_pin_desc *descs;
29 char **pin_names;
30 unsigned int i;
31
32 pin_names = devm_kasprintf_strarray(dev, name, size);
33 if (IS_ERR(pin_names))
34 return PTR_ERR(pin_names);
35
36 descs = devm_krealloc_array(dev, pins->pins, base + size, sizeof(*descs), GFP_KERNEL);
37 if (!descs)
38 return -ENOMEM;
39
40 for (i = 0; i < size; i++) {
41 unsigned int pin_number = base + i;
42 char *pin_name = pin_names[i];
43 struct pinctrl_pin_desc *desc;
44
45 /* Unify delimiter for pin name */
46 strreplace(pin_name, '-', '_');
47
48 desc = &descs[pin_number];
49 desc->number = pin_number;
50 desc->name = pin_name;
51 }
52
53 pins->pins = descs;
54 pins->npins = base + size;
55
56 return 0;
57}
58
59static int intel_platform_pinctrl_prepare_group(struct device *dev,
60 struct fwnode_handle *child,
61 struct intel_padgroup *gpp,
62 struct intel_platform_pins *pins)
63{
64 size_t base = pins->npins;
65 const char *name;
66 u32 size;
67 int ret;
68
69 ret = fwnode_property_read_string(child, "intc-gpio-group-name", &name);
70 if (ret)
71 return ret;
72
73 ret = fwnode_property_read_u32(child, "intc-gpio-pad-count", &size);
74 if (ret)
75 return ret;
76
77 ret = intel_platform_pinctrl_prepare_pins(dev, base, name, size, pins);
78 if (ret)
79 return ret;
80
81 gpp->base = base;
82 gpp->size = size;
83 gpp->gpio_base = INTEL_GPIO_BASE_MATCH;
84
85 return 0;
86}
87
88static int intel_platform_pinctrl_prepare_community(struct device *dev,
89 struct intel_community *community,
90 struct intel_platform_pins *pins)
91{
92 struct intel_padgroup *gpps;
93 unsigned int group;
94 size_t ngpps;
95 u32 offset;
96 int ret;
97
98 ret = device_property_read_u32(dev, "intc-gpio-pad-ownership-offset", &offset);
99 if (ret)
100 return ret;
101 community->padown_offset = offset;
102
103 ret = device_property_read_u32(dev, "intc-gpio-pad-configuration-lock-offset", &offset);
104 if (ret)
105 return ret;
106 community->padcfglock_offset = offset;
107
108 ret = device_property_read_u32(dev, "intc-gpio-host-software-pad-ownership-offset", &offset);
109 if (ret)
110 return ret;
111 community->hostown_offset = offset;
112
113 ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-status-offset", &offset);
114 if (ret)
115 return ret;
116 community->is_offset = offset;
117
118 ret = device_property_read_u32(dev, "intc-gpio-gpi-interrupt-enable-offset", &offset);
119 if (ret)
120 return ret;
121 community->ie_offset = offset;
122
123 ngpps = device_get_child_node_count(dev);
124 if (!ngpps)
125 return -ENODEV;
126
127 gpps = devm_kcalloc(dev, ngpps, sizeof(*gpps), GFP_KERNEL);
128 if (!gpps)
129 return -ENOMEM;
130
131 group = 0;
132 device_for_each_child_node_scoped(dev, child) {
133 struct intel_padgroup *gpp = &gpps[group];
134
135 gpp->reg_num = group;
136
137 ret = intel_platform_pinctrl_prepare_group(dev, child, gpp, pins);
138 if (ret)
139 return ret;
140
141 group++;
142 }
143
144 community->ngpps = ngpps;
145 community->gpps = gpps;
146
147 return 0;
148}
149
150static int intel_platform_pinctrl_prepare_soc_data(struct device *dev,
151 struct intel_pinctrl_soc_data *data)
152{
153 struct intel_platform_pins pins = {};
154 struct intel_community *communities;
155 size_t ncommunities;
156 unsigned int i;
157 int ret;
158
159 /* Version 1.0 of the specification assumes only a single community per device node */
160 ncommunities = 1;
161 communities = devm_kcalloc(dev, ncommunities, sizeof(*communities), GFP_KERNEL);
162 if (!communities)
163 return -ENOMEM;
164
165 for (i = 0; i < ncommunities; i++) {
166 struct intel_community *community = &communities[i];
167
168 community->barno = i;
169 community->pin_base = pins.npins;
170
171 ret = intel_platform_pinctrl_prepare_community(dev, community, &pins);
172 if (ret)
173 return ret;
174
175 community->npins = pins.npins - community->pin_base;
176 }
177
178 data->ncommunities = ncommunities;
179 data->communities = communities;
180
181 data->npins = pins.npins;
182 data->pins = pins.pins;
183
184 return 0;
185}
186
187static int intel_platform_pinctrl_probe(struct platform_device *pdev)
188{
189 struct intel_pinctrl_soc_data *data;
190 struct device *dev = &pdev->dev;
191 int ret;
192
193 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
194 if (!data)
195 return -ENOMEM;
196
197 ret = intel_platform_pinctrl_prepare_soc_data(dev, data);
198 if (ret)
199 return ret;
200
201 return intel_pinctrl_probe(pdev, data);
202}
203
204static const struct acpi_device_id intel_platform_pinctrl_acpi_match[] = {
205 { "INTC105F" },
206 { }
207};
208MODULE_DEVICE_TABLE(acpi, intel_platform_pinctrl_acpi_match);
209
210static struct platform_driver intel_platform_pinctrl_driver = {
211 .probe = intel_platform_pinctrl_probe,
212 .driver = {
213 .name = "intel-pinctrl",
214 .acpi_match_table = intel_platform_pinctrl_acpi_match,
215 .pm = pm_sleep_ptr(&intel_pinctrl_pm_ops),
216 },
217};
218module_platform_driver(intel_platform_pinctrl_driver);
219
220MODULE_AUTHOR("Andy Shevchenko <[email protected]>");
221MODULE_DESCRIPTION("Intel PCH pinctrl/GPIO driver");
222MODULE_LICENSE("GPL v2");
223MODULE_IMPORT_NS("PINCTRL_INTEL");