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
26 struct 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
35 static const struct regmap_config apcs_regmap_config = {
36 .reg_bits = 32,
37 .reg_stride = 4,
38 .val_bits = 32,
39 .max_register = 0xFFC,
40 .fast_io = true,
41 };
42
qcom_apcs_ipc_send_data(struct mbox_chan * chan,void * data)43 static 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
52 static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
53 .send_data = qcom_apcs_ipc_send_data,
54 };
55
qcom_apcs_ipc_probe(struct platform_device * pdev)56 static int qcom_apcs_ipc_probe(struct platform_device *pdev)
57 {
58 struct qcom_apcs_ipc *apcs;
59 struct regmap *regmap;
60 struct resource *res;
61 unsigned long offset;
62 void __iomem *base;
63 unsigned long i;
64 int ret;
65 const struct of_device_id apcs_clk_match_table[] = {
66 { .compatible = "qcom,msm8916-apcs-kpss-global", },
67 { .compatible = "qcom,qcs404-apcs-apps-global", },
68 {}
69 };
70
71 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
72 if (!apcs)
73 return -ENOMEM;
74
75 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
76 base = devm_ioremap_resource(&pdev->dev, res);
77 if (IS_ERR(base))
78 return PTR_ERR(base);
79
80 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
81 if (IS_ERR(regmap))
82 return PTR_ERR(regmap);
83
84 offset = (unsigned long)of_device_get_match_data(&pdev->dev);
85
86 apcs->regmap = regmap;
87 apcs->offset = offset;
88
89 /* Initialize channel identifiers */
90 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
91 apcs->mbox_chans[i].con_priv = (void *)i;
92
93 apcs->mbox.dev = &pdev->dev;
94 apcs->mbox.ops = &qcom_apcs_ipc_ops;
95 apcs->mbox.chans = apcs->mbox_chans;
96 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
97
98 ret = mbox_controller_register(&apcs->mbox);
99 if (ret) {
100 dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
101 return ret;
102 }
103
104 if (of_match_device(apcs_clk_match_table, &pdev->dev)) {
105 apcs->clk = platform_device_register_data(&pdev->dev,
106 "qcom-apcs-msm8916-clk",
107 -1, NULL, 0);
108 if (IS_ERR(apcs->clk))
109 dev_err(&pdev->dev, "failed to register APCS clk\n");
110 }
111
112 platform_set_drvdata(pdev, apcs);
113
114 return 0;
115 }
116
qcom_apcs_ipc_remove(struct platform_device * pdev)117 static int qcom_apcs_ipc_remove(struct platform_device *pdev)
118 {
119 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
120 struct platform_device *clk = apcs->clk;
121
122 mbox_controller_unregister(&apcs->mbox);
123 platform_device_unregister(clk);
124
125 return 0;
126 }
127
128 /* .data is the offset of the ipc register within the global block */
129 static const struct of_device_id qcom_apcs_ipc_of_match[] = {
130 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
131 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
132 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 },
133 { .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
134 {}
135 };
136 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
137
138 static struct platform_driver qcom_apcs_ipc_driver = {
139 .probe = qcom_apcs_ipc_probe,
140 .remove = qcom_apcs_ipc_remove,
141 .driver = {
142 .name = "qcom_apcs_ipc",
143 .of_match_table = qcom_apcs_ipc_of_match,
144 },
145 };
146
qcom_apcs_ipc_init(void)147 static int __init qcom_apcs_ipc_init(void)
148 {
149 return platform_driver_register(&qcom_apcs_ipc_driver);
150 }
151 postcore_initcall(qcom_apcs_ipc_init);
152
qcom_apcs_ipc_exit(void)153 static void __exit qcom_apcs_ipc_exit(void)
154 {
155 platform_driver_unregister(&qcom_apcs_ipc_driver);
156 }
157 module_exit(qcom_apcs_ipc_exit);
158
159 MODULE_LICENSE("GPL v2");
160 MODULE_DESCRIPTION("Qualcomm APCS IPC driver");
161