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1 | /* |
2 | * Copyright (c) 2017, Linaro Ltd | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/of_platform.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/mailbox_controller.h> | |
22 | ||
23 | #define QCOM_APCS_IPC_BITS 32 | |
24 | ||
25 | struct qcom_apcs_ipc { | |
26 | struct mbox_controller mbox; | |
27 | struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS]; | |
28 | ||
29 | void __iomem *reg; | |
30 | unsigned long offset; | |
31 | }; | |
32 | ||
33 | static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) | |
34 | { | |
35 | struct qcom_apcs_ipc *apcs = container_of(chan->mbox, | |
36 | struct qcom_apcs_ipc, mbox); | |
37 | unsigned long idx = (unsigned long)chan->con_priv; | |
38 | ||
39 | writel(BIT(idx), apcs->reg); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | ||
44 | static const struct mbox_chan_ops qcom_apcs_ipc_ops = { | |
45 | .send_data = qcom_apcs_ipc_send_data, | |
46 | }; | |
47 | ||
48 | static int qcom_apcs_ipc_probe(struct platform_device *pdev) | |
49 | { | |
50 | struct qcom_apcs_ipc *apcs; | |
51 | struct resource *res; | |
52 | unsigned long offset; | |
53 | void __iomem *base; | |
54 | unsigned long i; | |
55 | int ret; | |
56 | ||
57 | apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); | |
58 | if (!apcs) | |
59 | return -ENOMEM; | |
60 | ||
61 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
62 | base = devm_ioremap_resource(&pdev->dev, res); | |
63 | if (IS_ERR(base)) | |
64 | return PTR_ERR(base); | |
65 | ||
66 | offset = (unsigned long)of_device_get_match_data(&pdev->dev); | |
67 | ||
68 | apcs->reg = base + offset; | |
69 | ||
70 | /* Initialize channel identifiers */ | |
71 | for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) | |
72 | apcs->mbox_chans[i].con_priv = (void *)i; | |
73 | ||
74 | apcs->mbox.dev = &pdev->dev; | |
75 | apcs->mbox.ops = &qcom_apcs_ipc_ops; | |
76 | apcs->mbox.chans = apcs->mbox_chans; | |
77 | apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); | |
78 | ||
79 | ret = mbox_controller_register(&apcs->mbox); | |
80 | if (ret) { | |
81 | dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); | |
82 | return ret; | |
83 | } | |
84 | ||
85 | platform_set_drvdata(pdev, apcs); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int qcom_apcs_ipc_remove(struct platform_device *pdev) | |
91 | { | |
92 | struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); | |
93 | ||
94 | mbox_controller_unregister(&apcs->mbox); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | /* .data is the offset of the ipc register within the global block */ | |
100 | static const struct of_device_id qcom_apcs_ipc_of_match[] = { | |
101 | { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 }, | |
102 | { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 }, | |
103 | {} | |
104 | }; | |
105 | MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); | |
106 | ||
107 | static struct platform_driver qcom_apcs_ipc_driver = { | |
108 | .probe = qcom_apcs_ipc_probe, | |
109 | .remove = qcom_apcs_ipc_remove, | |
110 | .driver = { | |
111 | .name = "qcom_apcs_ipc", | |
112 | .of_match_table = qcom_apcs_ipc_of_match, | |
113 | }, | |
114 | }; | |
115 | ||
116 | static int __init qcom_apcs_ipc_init(void) | |
117 | { | |
118 | return platform_driver_register(&qcom_apcs_ipc_driver); | |
119 | } | |
120 | postcore_initcall(qcom_apcs_ipc_init); | |
121 | ||
122 | static void __exit qcom_apcs_ipc_exit(void) | |
123 | { | |
124 | platform_driver_unregister(&qcom_apcs_ipc_driver); | |
125 | } | |
126 | module_exit(qcom_apcs_ipc_exit); | |
127 | ||
128 | MODULE_LICENSE("GPL v2"); | |
129 | MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); |