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25bfee16 BA |
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> | |
c6a8b171 | 21 | #include <linux/regmap.h> |
25bfee16 BA |
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 | ||
c6a8b171 | 30 | struct regmap *regmap; |
25bfee16 BA |
31 | unsigned long offset; |
32 | }; | |
33 | ||
c6a8b171 GD |
34 | static const struct regmap_config apcs_regmap_config = { |
35 | .reg_bits = 32, | |
36 | .reg_stride = 4, | |
37 | .val_bits = 32, | |
38 | .max_register = 0x1000, | |
39 | .fast_io = true, | |
40 | }; | |
41 | ||
25bfee16 BA |
42 | static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) |
43 | { | |
44 | struct qcom_apcs_ipc *apcs = container_of(chan->mbox, | |
45 | struct qcom_apcs_ipc, mbox); | |
46 | unsigned long idx = (unsigned long)chan->con_priv; | |
47 | ||
c6a8b171 | 48 | return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); |
25bfee16 BA |
49 | } |
50 | ||
51 | static const struct mbox_chan_ops qcom_apcs_ipc_ops = { | |
52 | .send_data = qcom_apcs_ipc_send_data, | |
53 | }; | |
54 | ||
55 | static int qcom_apcs_ipc_probe(struct platform_device *pdev) | |
56 | { | |
c6a8b171 | 57 | struct device_node *np = pdev->dev.of_node; |
25bfee16 | 58 | struct qcom_apcs_ipc *apcs; |
c6a8b171 | 59 | struct regmap *regmap; |
25bfee16 BA |
60 | struct resource *res; |
61 | unsigned long offset; | |
62 | void __iomem *base; | |
63 | unsigned long i; | |
64 | int ret; | |
65 | ||
66 | apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); | |
67 | if (!apcs) | |
68 | return -ENOMEM; | |
69 | ||
70 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
71 | base = devm_ioremap_resource(&pdev->dev, res); | |
72 | if (IS_ERR(base)) | |
73 | return PTR_ERR(base); | |
74 | ||
c6a8b171 GD |
75 | regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); |
76 | if (IS_ERR(regmap)) | |
77 | return PTR_ERR(regmap); | |
78 | ||
25bfee16 BA |
79 | offset = (unsigned long)of_device_get_match_data(&pdev->dev); |
80 | ||
c6a8b171 GD |
81 | apcs->regmap = regmap; |
82 | apcs->offset = offset; | |
25bfee16 BA |
83 | |
84 | /* Initialize channel identifiers */ | |
85 | for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) | |
86 | apcs->mbox_chans[i].con_priv = (void *)i; | |
87 | ||
88 | apcs->mbox.dev = &pdev->dev; | |
89 | apcs->mbox.ops = &qcom_apcs_ipc_ops; | |
90 | apcs->mbox.chans = apcs->mbox_chans; | |
91 | apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); | |
92 | ||
93 | ret = mbox_controller_register(&apcs->mbox); | |
94 | if (ret) { | |
95 | dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); | |
96 | return ret; | |
97 | } | |
98 | ||
99 | platform_set_drvdata(pdev, apcs); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int qcom_apcs_ipc_remove(struct platform_device *pdev) | |
105 | { | |
106 | struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); | |
107 | ||
108 | mbox_controller_unregister(&apcs->mbox); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | /* .data is the offset of the ipc register within the global block */ | |
114 | static const struct of_device_id qcom_apcs_ipc_of_match[] = { | |
115 | { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 }, | |
116 | { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 }, | |
117 | {} | |
118 | }; | |
119 | MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); | |
120 | ||
121 | static struct platform_driver qcom_apcs_ipc_driver = { | |
122 | .probe = qcom_apcs_ipc_probe, | |
123 | .remove = qcom_apcs_ipc_remove, | |
124 | .driver = { | |
125 | .name = "qcom_apcs_ipc", | |
126 | .of_match_table = qcom_apcs_ipc_of_match, | |
127 | }, | |
128 | }; | |
129 | ||
130 | static int __init qcom_apcs_ipc_init(void) | |
131 | { | |
132 | return platform_driver_register(&qcom_apcs_ipc_driver); | |
133 | } | |
134 | postcore_initcall(qcom_apcs_ipc_init); | |
135 | ||
136 | static void __exit qcom_apcs_ipc_exit(void) | |
137 | { | |
138 | platform_driver_unregister(&qcom_apcs_ipc_driver); | |
139 | } | |
140 | module_exit(qcom_apcs_ipc_exit); | |
141 | ||
142 | MODULE_LICENSE("GPL v2"); | |
143 | MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); |