Revert "brcmfmac: move configuration of probe request IEs"
[platform/kernel/linux-rpi.git] / drivers / hwspinlock / qcom_hwspinlock.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
4  * Copyright (c) 2015, Sony Mobile Communications AB
5  */
6
7 #include <linux/hwspinlock.h>
8 #include <linux/io.h>
9 #include <linux/kernel.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_device.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16
17 #include "hwspinlock_internal.h"
18
19 #define QCOM_MUTEX_APPS_PROC_ID 1
20 #define QCOM_MUTEX_NUM_LOCKS    32
21
22 struct qcom_hwspinlock_of_data {
23         u32 offset;
24         u32 stride;
25         const struct regmap_config *regmap_config;
26 };
27
28 static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
29 {
30         struct regmap_field *field = lock->priv;
31         u32 lock_owner;
32         int ret;
33
34         ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
35         if (ret)
36                 return ret;
37
38         ret = regmap_field_read(field, &lock_owner);
39         if (ret)
40                 return ret;
41
42         return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
43 }
44
45 static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
46 {
47         struct regmap_field *field = lock->priv;
48         u32 lock_owner;
49         int ret;
50
51         ret = regmap_field_read(field, &lock_owner);
52         if (ret) {
53                 pr_err("%s: unable to query spinlock owner\n", __func__);
54                 return;
55         }
56
57         if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
58                 pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
59                                 __func__, lock_owner);
60         }
61
62         ret = regmap_field_write(field, 0);
63         if (ret)
64                 pr_err("%s: failed to unlock spinlock\n", __func__);
65 }
66
67 static const struct hwspinlock_ops qcom_hwspinlock_ops = {
68         .trylock        = qcom_hwspinlock_trylock,
69         .unlock         = qcom_hwspinlock_unlock,
70 };
71
72 static const struct regmap_config sfpb_mutex_config = {
73         .reg_bits               = 32,
74         .reg_stride             = 4,
75         .val_bits               = 32,
76         .max_register           = 0x100,
77         .fast_io                = true,
78 };
79
80 static const struct qcom_hwspinlock_of_data of_sfpb_mutex = {
81         .offset = 0x4,
82         .stride = 0x4,
83         .regmap_config = &sfpb_mutex_config,
84 };
85
86 static const struct regmap_config tcsr_msm8226_mutex_config = {
87         .reg_bits               = 32,
88         .reg_stride             = 4,
89         .val_bits               = 32,
90         .max_register           = 0x1000,
91         .fast_io                = true,
92 };
93
94 static const struct qcom_hwspinlock_of_data of_msm8226_tcsr_mutex = {
95         .offset = 0,
96         .stride = 0x80,
97         .regmap_config = &tcsr_msm8226_mutex_config,
98 };
99
100 static const struct regmap_config tcsr_mutex_config = {
101         .reg_bits               = 32,
102         .reg_stride             = 4,
103         .val_bits               = 32,
104         .max_register           = 0x20000,
105         .fast_io                = true,
106 };
107
108 static const struct qcom_hwspinlock_of_data of_tcsr_mutex = {
109         .offset = 0,
110         .stride = 0x1000,
111         .regmap_config = &tcsr_mutex_config,
112 };
113
114 static const struct of_device_id qcom_hwspinlock_of_match[] = {
115         { .compatible = "qcom,sfpb-mutex", .data = &of_sfpb_mutex },
116         { .compatible = "qcom,tcsr-mutex", .data = &of_tcsr_mutex },
117         { .compatible = "qcom,apq8084-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
118         { .compatible = "qcom,ipq6018-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
119         { .compatible = "qcom,msm8226-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
120         { .compatible = "qcom,msm8974-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
121         { .compatible = "qcom,msm8994-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
122         { }
123 };
124 MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
125
126 static struct regmap *qcom_hwspinlock_probe_syscon(struct platform_device *pdev,
127                                                    u32 *base, u32 *stride)
128 {
129         struct device_node *syscon;
130         struct regmap *regmap;
131         int ret;
132
133         syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
134         if (!syscon)
135                 return ERR_PTR(-ENODEV);
136
137         regmap = syscon_node_to_regmap(syscon);
138         of_node_put(syscon);
139         if (IS_ERR(regmap))
140                 return regmap;
141
142         ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, base);
143         if (ret < 0) {
144                 dev_err(&pdev->dev, "no offset in syscon\n");
145                 return ERR_PTR(-EINVAL);
146         }
147
148         ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, stride);
149         if (ret < 0) {
150                 dev_err(&pdev->dev, "no stride syscon\n");
151                 return ERR_PTR(-EINVAL);
152         }
153
154         return regmap;
155 }
156
157 static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
158                                                  u32 *offset, u32 *stride)
159 {
160         const struct qcom_hwspinlock_of_data *data;
161         struct device *dev = &pdev->dev;
162         void __iomem *base;
163
164         data = of_device_get_match_data(dev);
165         if (!data->regmap_config)
166                 return ERR_PTR(-EINVAL);
167
168         *offset = data->offset;
169         *stride = data->stride;
170
171         base = devm_platform_ioremap_resource(pdev, 0);
172         if (IS_ERR(base))
173                 return ERR_CAST(base);
174
175         return devm_regmap_init_mmio(dev, base, data->regmap_config);
176 }
177
178 static int qcom_hwspinlock_probe(struct platform_device *pdev)
179 {
180         struct hwspinlock_device *bank;
181         struct reg_field field;
182         struct regmap *regmap;
183         size_t array_size;
184         u32 stride;
185         u32 base;
186         int i;
187
188         regmap = qcom_hwspinlock_probe_syscon(pdev, &base, &stride);
189         if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
190                 regmap = qcom_hwspinlock_probe_mmio(pdev, &base, &stride);
191
192         if (IS_ERR(regmap))
193                 return PTR_ERR(regmap);
194
195         array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
196         bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
197         if (!bank)
198                 return -ENOMEM;
199
200         platform_set_drvdata(pdev, bank);
201
202         for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
203                 field.reg = base + i * stride;
204                 field.lsb = 0;
205                 field.msb = 31;
206
207                 bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
208                                                              regmap, field);
209                 if (IS_ERR(bank->lock[i].priv))
210                         return PTR_ERR(bank->lock[i].priv);
211         }
212
213         return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
214                                          0, QCOM_MUTEX_NUM_LOCKS);
215 }
216
217 static struct platform_driver qcom_hwspinlock_driver = {
218         .probe          = qcom_hwspinlock_probe,
219         .driver         = {
220                 .name   = "qcom_hwspinlock",
221                 .of_match_table = qcom_hwspinlock_of_match,
222         },
223 };
224
225 static int __init qcom_hwspinlock_init(void)
226 {
227         return platform_driver_register(&qcom_hwspinlock_driver);
228 }
229 /* board init code might need to reserve hwspinlocks for predefined purposes */
230 postcore_initcall(qcom_hwspinlock_init);
231
232 static void __exit qcom_hwspinlock_exit(void)
233 {
234         platform_driver_unregister(&qcom_hwspinlock_driver);
235 }
236 module_exit(qcom_hwspinlock_exit);
237
238 MODULE_LICENSE("GPL v2");
239 MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");