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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
22struct qcom_hwspinlock_of_data {
23 u32 offset;
24 u32 stride;
25 const struct regmap_config *regmap_config;
26};
27
28static 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
45static 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
67static int qcom_hwspinlock_bust(struct hwspinlock *lock, unsigned int id)
68{
69 struct regmap_field *field = lock->priv;
70 u32 owner;
71 int ret;
72
73 ret = regmap_field_read(field, &owner);
74 if (ret) {
75 dev_err(lock->bank->dev, "unable to query spinlock owner\n");
76 return ret;
77 }
78
79 if (owner != id)
80 return 0;
81
82 ret = regmap_field_write(field, 0);
83 if (ret) {
84 dev_err(lock->bank->dev, "failed to bust spinlock\n");
85 return ret;
86 }
87
88 return 0;
89}
90
91static const struct hwspinlock_ops qcom_hwspinlock_ops = {
92 .trylock = qcom_hwspinlock_trylock,
93 .unlock = qcom_hwspinlock_unlock,
94 .bust = qcom_hwspinlock_bust,
95};
96
97static const struct regmap_config sfpb_mutex_config = {
98 .reg_bits = 32,
99 .reg_stride = 4,
100 .val_bits = 32,
101 .max_register = 0x100,
102 .fast_io = true,
103};
104
105static const struct qcom_hwspinlock_of_data of_sfpb_mutex = {
106 .offset = 0x4,
107 .stride = 0x4,
108 .regmap_config = &sfpb_mutex_config,
109};
110
111static const struct regmap_config tcsr_msm8226_mutex_config = {
112 .reg_bits = 32,
113 .reg_stride = 4,
114 .val_bits = 32,
115 .max_register = 0x1000,
116 .fast_io = true,
117};
118
119static const struct qcom_hwspinlock_of_data of_msm8226_tcsr_mutex = {
120 .offset = 0,
121 .stride = 0x80,
122 .regmap_config = &tcsr_msm8226_mutex_config,
123};
124
125static const struct regmap_config tcsr_mutex_config = {
126 .reg_bits = 32,
127 .reg_stride = 4,
128 .val_bits = 32,
129 .max_register = 0x20000,
130 .fast_io = true,
131};
132
133static const struct qcom_hwspinlock_of_data of_tcsr_mutex = {
134 .offset = 0,
135 .stride = 0x1000,
136 .regmap_config = &tcsr_mutex_config,
137};
138
139static const struct of_device_id qcom_hwspinlock_of_match[] = {
140 { .compatible = "qcom,sfpb-mutex", .data = &of_sfpb_mutex },
141 { .compatible = "qcom,tcsr-mutex", .data = &of_tcsr_mutex },
142 { .compatible = "qcom,apq8084-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
143 { .compatible = "qcom,msm8226-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
144 { .compatible = "qcom,msm8974-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
145 { .compatible = "qcom,msm8994-tcsr-mutex", .data = &of_msm8226_tcsr_mutex },
146 { }
147};
148MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
149
150static struct regmap *qcom_hwspinlock_probe_syscon(struct platform_device *pdev,
151 u32 *base, u32 *stride)
152{
153 struct device_node *syscon;
154 struct regmap *regmap;
155 int ret;
156
157 syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
158 if (!syscon)
159 return ERR_PTR(-ENODEV);
160
161 regmap = syscon_node_to_regmap(syscon);
162 of_node_put(syscon);
163 if (IS_ERR(regmap))
164 return regmap;
165
166 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, base);
167 if (ret < 0) {
168 dev_err(&pdev->dev, "no offset in syscon\n");
169 return ERR_PTR(-EINVAL);
170 }
171
172 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, stride);
173 if (ret < 0) {
174 dev_err(&pdev->dev, "no stride syscon\n");
175 return ERR_PTR(-EINVAL);
176 }
177
178 return regmap;
179}
180
181static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
182 u32 *offset, u32 *stride)
183{
184 const struct qcom_hwspinlock_of_data *data;
185 struct device *dev = &pdev->dev;
186 void __iomem *base;
187
188 data = of_device_get_match_data(dev);
189 if (!data->regmap_config)
190 return ERR_PTR(-EINVAL);
191
192 *offset = data->offset;
193 *stride = data->stride;
194
195 base = devm_platform_ioremap_resource(pdev, 0);
196 if (IS_ERR(base))
197 return ERR_CAST(base);
198
199 return devm_regmap_init_mmio(dev, base, data->regmap_config);
200}
201
202static int qcom_hwspinlock_probe(struct platform_device *pdev)
203{
204 struct hwspinlock_device *bank;
205 struct reg_field field;
206 struct regmap *regmap;
207 size_t array_size;
208 u32 stride;
209 u32 base;
210 int i;
211
212 regmap = qcom_hwspinlock_probe_syscon(pdev, &base, &stride);
213 if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
214 regmap = qcom_hwspinlock_probe_mmio(pdev, &base, &stride);
215
216 if (IS_ERR(regmap))
217 return PTR_ERR(regmap);
218
219 array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
220 bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
221 if (!bank)
222 return -ENOMEM;
223
224 platform_set_drvdata(pdev, bank);
225
226 for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
227 field.reg = base + i * stride;
228 field.lsb = 0;
229 field.msb = 31;
230
231 bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
232 regmap, field);
233 if (IS_ERR(bank->lock[i].priv))
234 return PTR_ERR(bank->lock[i].priv);
235 }
236
237 return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
238 0, QCOM_MUTEX_NUM_LOCKS);
239}
240
241static struct platform_driver qcom_hwspinlock_driver = {
242 .probe = qcom_hwspinlock_probe,
243 .driver = {
244 .name = "qcom_hwspinlock",
245 .of_match_table = qcom_hwspinlock_of_match,
246 },
247};
248
249static int __init qcom_hwspinlock_init(void)
250{
251 return platform_driver_register(&qcom_hwspinlock_driver);
252}
253/* board init code might need to reserve hwspinlocks for predefined purposes */
254postcore_initcall(qcom_hwspinlock_init);
255
256static void __exit qcom_hwspinlock_exit(void)
257{
258 platform_driver_unregister(&qcom_hwspinlock_driver);
259}
260module_exit(qcom_hwspinlock_exit);
261
262MODULE_LICENSE("GPL v2");
263MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");
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
22static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
23{
24 struct regmap_field *field = lock->priv;
25 u32 lock_owner;
26 int ret;
27
28 ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
29 if (ret)
30 return ret;
31
32 ret = regmap_field_read(field, &lock_owner);
33 if (ret)
34 return ret;
35
36 return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
37}
38
39static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
40{
41 struct regmap_field *field = lock->priv;
42 u32 lock_owner;
43 int ret;
44
45 ret = regmap_field_read(field, &lock_owner);
46 if (ret) {
47 pr_err("%s: unable to query spinlock owner\n", __func__);
48 return;
49 }
50
51 if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
52 pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
53 __func__, lock_owner);
54 }
55
56 ret = regmap_field_write(field, 0);
57 if (ret)
58 pr_err("%s: failed to unlock spinlock\n", __func__);
59}
60
61static const struct hwspinlock_ops qcom_hwspinlock_ops = {
62 .trylock = qcom_hwspinlock_trylock,
63 .unlock = qcom_hwspinlock_unlock,
64};
65
66static const struct of_device_id qcom_hwspinlock_of_match[] = {
67 { .compatible = "qcom,sfpb-mutex" },
68 { .compatible = "qcom,tcsr-mutex" },
69 { }
70};
71MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
72
73static struct regmap *qcom_hwspinlock_probe_syscon(struct platform_device *pdev,
74 u32 *base, u32 *stride)
75{
76 struct device_node *syscon;
77 struct regmap *regmap;
78 int ret;
79
80 syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
81 if (!syscon)
82 return ERR_PTR(-ENODEV);
83
84 regmap = syscon_node_to_regmap(syscon);
85 of_node_put(syscon);
86 if (IS_ERR(regmap))
87 return regmap;
88
89 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, base);
90 if (ret < 0) {
91 dev_err(&pdev->dev, "no offset in syscon\n");
92 return ERR_PTR(-EINVAL);
93 }
94
95 ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, stride);
96 if (ret < 0) {
97 dev_err(&pdev->dev, "no stride syscon\n");
98 return ERR_PTR(-EINVAL);
99 }
100
101 return regmap;
102}
103
104static const struct regmap_config tcsr_mutex_config = {
105 .reg_bits = 32,
106 .reg_stride = 4,
107 .val_bits = 32,
108 .max_register = 0x40000,
109 .fast_io = true,
110};
111
112static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
113 u32 *offset, u32 *stride)
114{
115 struct device *dev = &pdev->dev;
116 void __iomem *base;
117
118 /* All modern platform has offset 0 and stride of 4k */
119 *offset = 0;
120 *stride = 0x1000;
121
122 base = devm_platform_ioremap_resource(pdev, 0);
123 if (IS_ERR(base))
124 return ERR_CAST(base);
125
126 return devm_regmap_init_mmio(dev, base, &tcsr_mutex_config);
127}
128
129static int qcom_hwspinlock_probe(struct platform_device *pdev)
130{
131 struct hwspinlock_device *bank;
132 struct reg_field field;
133 struct regmap *regmap;
134 size_t array_size;
135 u32 stride;
136 u32 base;
137 int i;
138
139 regmap = qcom_hwspinlock_probe_syscon(pdev, &base, &stride);
140 if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
141 regmap = qcom_hwspinlock_probe_mmio(pdev, &base, &stride);
142
143 if (IS_ERR(regmap))
144 return PTR_ERR(regmap);
145
146 array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
147 bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
148 if (!bank)
149 return -ENOMEM;
150
151 platform_set_drvdata(pdev, bank);
152
153 for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
154 field.reg = base + i * stride;
155 field.lsb = 0;
156 field.msb = 31;
157
158 bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
159 regmap, field);
160 }
161
162 return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
163 0, QCOM_MUTEX_NUM_LOCKS);
164}
165
166static struct platform_driver qcom_hwspinlock_driver = {
167 .probe = qcom_hwspinlock_probe,
168 .driver = {
169 .name = "qcom_hwspinlock",
170 .of_match_table = qcom_hwspinlock_of_match,
171 },
172};
173
174static int __init qcom_hwspinlock_init(void)
175{
176 return platform_driver_register(&qcom_hwspinlock_driver);
177}
178/* board init code might need to reserve hwspinlocks for predefined purposes */
179postcore_initcall(qcom_hwspinlock_init);
180
181static void __exit qcom_hwspinlock_exit(void)
182{
183 platform_driver_unregister(&qcom_hwspinlock_driver);
184}
185module_exit(qcom_hwspinlock_exit);
186
187MODULE_LICENSE("GPL v2");
188MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");