tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2017, Linaro Ltd
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/io.h>
9#include <linux/slab.h>
10#include <linux/of.h>
11#include <linux/of_platform.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/mailbox_controller.h>
15
16#define QCOM_APCS_IPC_BITS 32
17
18struct qcom_apcs_ipc {
19 struct mbox_controller mbox;
20 struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];
21
22 struct regmap *regmap;
23 unsigned long offset;
24 struct platform_device *clk;
25};
26
27struct qcom_apcs_ipc_data {
28 int offset;
29 char *clk_name;
30};
31
32static const struct qcom_apcs_ipc_data ipq6018_apcs_data = {
33 .offset = 8, .clk_name = "qcom,apss-ipq6018-clk"
34};
35
36static const struct qcom_apcs_ipc_data ipq8074_apcs_data = {
37 .offset = 8, .clk_name = NULL
38};
39
40static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
41 .offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
42};
43
44static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
45 .offset = 8, .clk_name = NULL
46};
47
48static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
49 .offset = 16, .clk_name = NULL
50};
51
52static const struct qcom_apcs_ipc_data msm8998_apcs_data = {
53 .offset = 8, .clk_name = NULL
54};
55
56static const struct qcom_apcs_ipc_data sdm660_apcs_data = {
57 .offset = 8, .clk_name = NULL
58};
59
60static const struct qcom_apcs_ipc_data sm6125_apcs_data = {
61 .offset = 8, .clk_name = NULL
62};
63
64static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
65 .offset = 12, .clk_name = NULL
66};
67
68static const struct qcom_apcs_ipc_data sdx55_apcs_data = {
69 .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
70};
71
72static const struct regmap_config apcs_regmap_config = {
73 .reg_bits = 32,
74 .reg_stride = 4,
75 .val_bits = 32,
76 .max_register = 0x1008,
77 .fast_io = true,
78};
79
80static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
81{
82 struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
83 struct qcom_apcs_ipc, mbox);
84 unsigned long idx = (unsigned long)chan->con_priv;
85
86 return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
87}
88
89static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
90 .send_data = qcom_apcs_ipc_send_data,
91};
92
93static int qcom_apcs_ipc_probe(struct platform_device *pdev)
94{
95 struct qcom_apcs_ipc *apcs;
96 const struct qcom_apcs_ipc_data *apcs_data;
97 struct regmap *regmap;
98 struct resource *res;
99 void __iomem *base;
100 unsigned long i;
101 int ret;
102
103 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
104 if (!apcs)
105 return -ENOMEM;
106
107 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
108 base = devm_ioremap_resource(&pdev->dev, res);
109 if (IS_ERR(base))
110 return PTR_ERR(base);
111
112 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
113 if (IS_ERR(regmap))
114 return PTR_ERR(regmap);
115
116 apcs_data = of_device_get_match_data(&pdev->dev);
117
118 apcs->regmap = regmap;
119 apcs->offset = apcs_data->offset;
120
121 /* Initialize channel identifiers */
122 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
123 apcs->mbox_chans[i].con_priv = (void *)i;
124
125 apcs->mbox.dev = &pdev->dev;
126 apcs->mbox.ops = &qcom_apcs_ipc_ops;
127 apcs->mbox.chans = apcs->mbox_chans;
128 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
129
130 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
131 if (ret) {
132 dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
133 return ret;
134 }
135
136 if (apcs_data->clk_name) {
137 apcs->clk = platform_device_register_data(&pdev->dev,
138 apcs_data->clk_name,
139 PLATFORM_DEVID_AUTO,
140 NULL, 0);
141 if (IS_ERR(apcs->clk))
142 dev_err(&pdev->dev, "failed to register APCS clk\n");
143 }
144
145 platform_set_drvdata(pdev, apcs);
146
147 return 0;
148}
149
150static int qcom_apcs_ipc_remove(struct platform_device *pdev)
151{
152 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
153 struct platform_device *clk = apcs->clk;
154
155 platform_device_unregister(clk);
156
157 return 0;
158}
159
160/* .data is the offset of the ipc register within the global block */
161static const struct of_device_id qcom_apcs_ipc_of_match[] = {
162 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
163 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data },
164 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
165 { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
166 { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
167 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
168 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
169 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data },
170 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
171 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
172 { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
173 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data },
174 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
175 { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &sm6125_apcs_data },
176 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
177 { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &sdm660_apcs_data },
178 { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
179 {}
180};
181MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
182
183static struct platform_driver qcom_apcs_ipc_driver = {
184 .probe = qcom_apcs_ipc_probe,
185 .remove = qcom_apcs_ipc_remove,
186 .driver = {
187 .name = "qcom_apcs_ipc",
188 .of_match_table = qcom_apcs_ipc_of_match,
189 },
190};
191
192static int __init qcom_apcs_ipc_init(void)
193{
194 return platform_driver_register(&qcom_apcs_ipc_driver);
195}
196postcore_initcall(qcom_apcs_ipc_init);
197
198static void __exit qcom_apcs_ipc_exit(void)
199{
200 platform_driver_unregister(&qcom_apcs_ipc_driver);
201}
202module_exit(qcom_apcs_ipc_exit);
203
204MODULE_LICENSE("GPL v2");
205MODULE_DESCRIPTION("Qualcomm APCS IPC driver");