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 msm8916_apcs_data = {
37	.offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
38};
39
40static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
41	.offset = 8, .clk_name = NULL
42};
43
44static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
45	.offset = 16, .clk_name = "qcom-apcs-msm8996-clk"
46};
47
48static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
49	.offset = 12, .clk_name = NULL
50};
51
52static const struct qcom_apcs_ipc_data sdx55_apcs_data = {
53	.offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
54};
55
56static const struct regmap_config apcs_regmap_config = {
57	.reg_bits = 32,
58	.reg_stride = 4,
59	.val_bits = 32,
60	.max_register = 0x1008,
61	.fast_io = true,
62};
63
64static 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
73static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
74	.send_data = qcom_apcs_ipc_send_data,
75};
76
77static 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	void __iomem *base;
83	unsigned long i;
84	int ret;
85
86	apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
87	if (!apcs)
88		return -ENOMEM;
89
90	base = devm_platform_ioremap_resource(pdev, 0);
91	if (IS_ERR(base))
92		return PTR_ERR(base);
93
94	regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
95	if (IS_ERR(regmap))
96		return PTR_ERR(regmap);
97
98	apcs_data = of_device_get_match_data(&pdev->dev);
99
100	apcs->regmap = regmap;
101	apcs->offset = apcs_data->offset;
102
103	/* Initialize channel identifiers */
104	for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
105		apcs->mbox_chans[i].con_priv = (void *)i;
106
107	apcs->mbox.dev = &pdev->dev;
108	apcs->mbox.ops = &qcom_apcs_ipc_ops;
109	apcs->mbox.chans = apcs->mbox_chans;
110	apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
111
112	ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
113	if (ret) {
114		dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
115		return ret;
116	}
117
118	if (apcs_data->clk_name) {
119		apcs->clk = platform_device_register_data(&pdev->dev,
120							  apcs_data->clk_name,
121							  PLATFORM_DEVID_AUTO,
122							  NULL, 0);
123		if (IS_ERR(apcs->clk))
124			dev_err(&pdev->dev, "failed to register APCS clk\n");
125	}
126
127	platform_set_drvdata(pdev, apcs);
128
129	return 0;
130}
131
132static void qcom_apcs_ipc_remove(struct platform_device *pdev)
133{
134	struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
135	struct platform_device *clk = apcs->clk;
136
137	platform_device_unregister(clk);
138}
139
140/* .data is the offset of the ipc register within the global block */
141static const struct of_device_id qcom_apcs_ipc_of_match[] = {
142	{ .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
143	{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
144	{ .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
145	{ .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
146	{ .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
147	{ .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
148	{ .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data },
149	{ .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
150	{ .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
151	/* Do not add any more entries using existing driver data */
152	{ .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data },
153	{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data },
154	{ .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
155	{ .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data },
156	{ .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data },
157	{ .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data },
158	{ .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data },
159	{ .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data },
160	{ .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data },
161	{ .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
162	{ .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
163	{ .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
164	{}
165};
166MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
167
168static struct platform_driver qcom_apcs_ipc_driver = {
169	.probe = qcom_apcs_ipc_probe,
170	.remove_new = qcom_apcs_ipc_remove,
171	.driver = {
172		.name = "qcom_apcs_ipc",
173		.of_match_table = qcom_apcs_ipc_of_match,
174	},
175};
176
177static int __init qcom_apcs_ipc_init(void)
178{
179	return platform_driver_register(&qcom_apcs_ipc_driver);
180}
181postcore_initcall(qcom_apcs_ipc_init);
182
183static void __exit qcom_apcs_ipc_exit(void)
184{
185	platform_driver_unregister(&qcom_apcs_ipc_driver);
186}
187module_exit(qcom_apcs_ipc_exit);
188
189MODULE_LICENSE("GPL v2");
190MODULE_DESCRIPTION("Qualcomm APCS IPC driver");
191