tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/regmap.h>
22#include <linux/mailbox_controller.h>
23
24#define QCOM_APCS_IPC_BITS 32
25
26struct qcom_apcs_ipc {
27 struct mbox_controller mbox;
28 struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];
29
30 struct regmap *regmap;
31 unsigned long offset;
32 struct platform_device *clk;
33};
34
35static const struct regmap_config apcs_regmap_config = {
36 .reg_bits = 32,
37 .reg_stride = 4,
38 .val_bits = 32,
39 .max_register = 0x1000,
40 .fast_io = true,
41};
42
43static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
44{
45 struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
46 struct qcom_apcs_ipc, mbox);
47 unsigned long idx = (unsigned long)chan->con_priv;
48
49 return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
50}
51
52static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
53 .send_data = qcom_apcs_ipc_send_data,
54};
55
56static int qcom_apcs_ipc_probe(struct platform_device *pdev)
57{
58 struct device_node *np = pdev->dev.of_node;
59 struct qcom_apcs_ipc *apcs;
60 struct regmap *regmap;
61 struct resource *res;
62 unsigned long offset;
63 void __iomem *base;
64 unsigned long i;
65 int ret;
66
67 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
68 if (!apcs)
69 return -ENOMEM;
70
71 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
72 base = devm_ioremap_resource(&pdev->dev, res);
73 if (IS_ERR(base))
74 return PTR_ERR(base);
75
76 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
77 if (IS_ERR(regmap))
78 return PTR_ERR(regmap);
79
80 offset = (unsigned long)of_device_get_match_data(&pdev->dev);
81
82 apcs->regmap = regmap;
83 apcs->offset = offset;
84
85 /* Initialize channel identifiers */
86 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
87 apcs->mbox_chans[i].con_priv = (void *)i;
88
89 apcs->mbox.dev = &pdev->dev;
90 apcs->mbox.ops = &qcom_apcs_ipc_ops;
91 apcs->mbox.chans = apcs->mbox_chans;
92 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
93
94 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
95 if (ret) {
96 dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
97 return ret;
98 }
99
100 if (of_device_is_compatible(np, "qcom,msm8916-apcs-kpss-global")) {
101 apcs->clk = platform_device_register_data(&pdev->dev,
102 "qcom-apcs-msm8916-clk",
103 -1, NULL, 0);
104 if (IS_ERR(apcs->clk))
105 dev_err(&pdev->dev, "failed to register APCS clk\n");
106 }
107
108 platform_set_drvdata(pdev, apcs);
109
110 return 0;
111}
112
113static int qcom_apcs_ipc_remove(struct platform_device *pdev)
114{
115 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
116 struct platform_device *clk = apcs->clk;
117
118 platform_device_unregister(clk);
119
120 return 0;
121}
122
123/* .data is the offset of the ipc register within the global block */
124static const struct of_device_id qcom_apcs_ipc_of_match[] = {
125 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
126 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
127 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 },
128 { .compatible = "qcom,qcs404-apcs-apps-global", .data = (void *)8 },
129 { .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
130 {}
131};
132MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
133
134static struct platform_driver qcom_apcs_ipc_driver = {
135 .probe = qcom_apcs_ipc_probe,
136 .remove = qcom_apcs_ipc_remove,
137 .driver = {
138 .name = "qcom_apcs_ipc",
139 .of_match_table = qcom_apcs_ipc_of_match,
140 },
141};
142
143static int __init qcom_apcs_ipc_init(void)
144{
145 return platform_driver_register(&qcom_apcs_ipc_driver);
146}
147postcore_initcall(qcom_apcs_ipc_init);
148
149static void __exit qcom_apcs_ipc_exit(void)
150{
151 platform_driver_unregister(&qcom_apcs_ipc_driver);
152}
153module_exit(qcom_apcs_ipc_exit);
154
155MODULE_LICENSE("GPL v2");
156MODULE_DESCRIPTION("Qualcomm APCS IPC driver");