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(map: apcs->regmap, reg: 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(dev: &pdev->dev, size: sizeof(*apcs), GFP_KERNEL);
87 if (!apcs)
88 return -ENOMEM;
89
90 base = devm_platform_ioremap_resource(pdev, index: 0);
91 if (IS_ERR(ptr: base))
92 return PTR_ERR(ptr: base);
93
94 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
95 if (IS_ERR(ptr: regmap))
96 return PTR_ERR(ptr: regmap);
97
98 apcs_data = of_device_get_match_data(dev: &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(dev: &pdev->dev, mbox: &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 struct device_node *np = of_get_child_by_name(node: pdev->dev.of_node,
120 name: "clock-controller");
121 struct platform_device_info pdevinfo = {
122 .parent = &pdev->dev,
123 .name = apcs_data->clk_name,
124 .id = PLATFORM_DEVID_AUTO,
125 .fwnode = of_fwnode_handle(np) ?: pdev->dev.fwnode,
126 .of_node_reused = !np,
127 };
128
129 apcs->clk = platform_device_register_full(pdevinfo: &pdevinfo);
130 of_node_put(node: np);
131 if (IS_ERR(ptr: apcs->clk))
132 dev_err(&pdev->dev, "failed to register APCS clk\n");
133 }
134
135 platform_set_drvdata(pdev, data: apcs);
136
137 return 0;
138}
139
140static void qcom_apcs_ipc_remove(struct platform_device *pdev)
141{
142 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
143 struct platform_device *clk = apcs->clk;
144
145 platform_device_unregister(clk);
146}
147
148/* .data is the offset of the ipc register within the global block */
149static const struct of_device_id qcom_apcs_ipc_of_match[] = {
150 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
151 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
152 { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
153 { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
154 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
155 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
156 { .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data },
157 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
158 { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
159 /* Do not add any more entries using existing driver data */
160 { .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data },
161 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data },
162 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
163 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data },
164 { .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data },
165 { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data },
166 { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data },
167 { .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data },
168 { .compatible = "qcom,ipq5424-apcs-apps-global", .data = &msm8994_apcs_data },
169 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data },
170 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
171 { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
172 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
173 {}
174};
175MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
176
177static struct platform_driver qcom_apcs_ipc_driver = {
178 .probe = qcom_apcs_ipc_probe,
179 .remove = qcom_apcs_ipc_remove,
180 .driver = {
181 .name = "qcom_apcs_ipc",
182 .of_match_table = qcom_apcs_ipc_of_match,
183 },
184};
185
186static int __init qcom_apcs_ipc_init(void)
187{
188 return platform_driver_register(&qcom_apcs_ipc_driver);
189}
190postcore_initcall(qcom_apcs_ipc_init);
191
192static void __exit qcom_apcs_ipc_exit(void)
193{
194 platform_driver_unregister(&qcom_apcs_ipc_driver);
195}
196module_exit(qcom_apcs_ipc_exit);
197
198MODULE_LICENSE("GPL v2");
199MODULE_DESCRIPTION("Qualcomm APCS IPC driver");
200

source code of linux/drivers/mailbox/qcom-apcs-ipc-mailbox.c