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[linux.git] / drivers / mailbox / qcom-apcs-ipc-mailbox.c
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
18 struct 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
27 struct qcom_apcs_ipc_data {
28         int offset;
29         char *clk_name;
30 };
31
32 static const struct qcom_apcs_ipc_data ipq6018_apcs_data = {
33         .offset = 8, .clk_name = "qcom,apss-ipq6018-clk"
34 };
35
36 static const struct qcom_apcs_ipc_data ipq8074_apcs_data = {
37         .offset = 8, .clk_name = NULL
38 };
39
40 static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
41         .offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
42 };
43
44 static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
45         .offset = 16, .clk_name = NULL
46 };
47
48 static const struct qcom_apcs_ipc_data msm8998_apcs_data = {
49         .offset = 8, .clk_name = NULL
50 };
51
52 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
53         .offset = 12, .clk_name = NULL
54 };
55
56 static const struct regmap_config apcs_regmap_config = {
57         .reg_bits = 32,
58         .reg_stride = 4,
59         .val_bits = 32,
60         .max_register = 0xFFC,
61         .fast_io = true,
62 };
63
64 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
65 {
66         struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
67                                                   struct qcom_apcs_ipc, mbox);
68         unsigned long idx = (unsigned long)chan->con_priv;
69
70         return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
71 }
72
73 static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
74         .send_data = qcom_apcs_ipc_send_data,
75 };
76
77 static int qcom_apcs_ipc_probe(struct platform_device *pdev)
78 {
79         struct qcom_apcs_ipc *apcs;
80         const struct qcom_apcs_ipc_data *apcs_data;
81         struct regmap *regmap;
82         struct resource *res;
83         void __iomem *base;
84         unsigned long i;
85         int ret;
86
87         apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
88         if (!apcs)
89                 return -ENOMEM;
90
91         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
92         base = devm_ioremap_resource(&pdev->dev, res);
93         if (IS_ERR(base))
94                 return PTR_ERR(base);
95
96         regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
97         if (IS_ERR(regmap))
98                 return PTR_ERR(regmap);
99
100         apcs_data = of_device_get_match_data(&pdev->dev);
101
102         apcs->regmap = regmap;
103         apcs->offset = apcs_data->offset;
104
105         /* Initialize channel identifiers */
106         for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
107                 apcs->mbox_chans[i].con_priv = (void *)i;
108
109         apcs->mbox.dev = &pdev->dev;
110         apcs->mbox.ops = &qcom_apcs_ipc_ops;
111         apcs->mbox.chans = apcs->mbox_chans;
112         apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
113
114         ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
115         if (ret) {
116                 dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
117                 return ret;
118         }
119
120         if (apcs_data->clk_name) {
121                 apcs->clk = platform_device_register_data(&pdev->dev,
122                                                           apcs_data->clk_name,
123                                                           PLATFORM_DEVID_NONE,
124                                                           NULL, 0);
125                 if (IS_ERR(apcs->clk))
126                         dev_err(&pdev->dev, "failed to register APCS clk\n");
127         }
128
129         platform_set_drvdata(pdev, apcs);
130
131         return 0;
132 }
133
134 static int qcom_apcs_ipc_remove(struct platform_device *pdev)
135 {
136         struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
137         struct platform_device *clk = apcs->clk;
138
139         platform_device_unregister(clk);
140
141         return 0;
142 }
143
144 /* .data is the offset of the ipc register within the global block */
145 static const struct of_device_id qcom_apcs_ipc_of_match[] = {
146         { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
147         { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data },
148         { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
149         { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
150         { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data },
151         { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
152         { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
153         { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
154         { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
155         {}
156 };
157 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
158
159 static struct platform_driver qcom_apcs_ipc_driver = {
160         .probe = qcom_apcs_ipc_probe,
161         .remove = qcom_apcs_ipc_remove,
162         .driver = {
163                 .name = "qcom_apcs_ipc",
164                 .of_match_table = qcom_apcs_ipc_of_match,
165         },
166 };
167
168 static int __init qcom_apcs_ipc_init(void)
169 {
170         return platform_driver_register(&qcom_apcs_ipc_driver);
171 }
172 postcore_initcall(qcom_apcs_ipc_init);
173
174 static void __exit qcom_apcs_ipc_exit(void)
175 {
176         platform_driver_unregister(&qcom_apcs_ipc_driver);
177 }
178 module_exit(qcom_apcs_ipc_exit);
179
180 MODULE_LICENSE("GPL v2");
181 MODULE_DESCRIPTION("Qualcomm APCS IPC driver");
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