qcom-apcs-ipc-mailbox.c

  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};
 62
 63static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
 64{
 65	struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
 66						  struct qcom_apcs_ipc, mbox);
 67	unsigned long idx = (unsigned long)chan->con_priv;
 68
 69	return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
 70}
 71
 72static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
 73	.send_data = qcom_apcs_ipc_send_data,
 74};
 75
 76static int qcom_apcs_ipc_probe(struct platform_device *pdev)
 77{
 78	struct qcom_apcs_ipc *apcs;
 79	const struct qcom_apcs_ipc_data *apcs_data;
 80	struct regmap *regmap;
 81	void __iomem *base;
 82	unsigned long i;
 83	int ret;
 84
 85	apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
 86	if (!apcs)
 87		return -ENOMEM;
 88
 89	base = devm_platform_ioremap_resource(pdev, 0);
 90	if (IS_ERR(base))
 91		return PTR_ERR(base);
 92
 93	regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
 94	if (IS_ERR(regmap))
 95		return PTR_ERR(regmap);
 96
 97	apcs_data = of_device_get_match_data(&pdev->dev);
 98
 99	apcs->regmap = regmap;
100	apcs->offset = apcs_data->offset;
101
102	/* Initialize channel identifiers */
103	for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
104		apcs->mbox_chans[i].con_priv = (void *)i;
105
106	apcs->mbox.dev = &pdev->dev;
107	apcs->mbox.ops = &qcom_apcs_ipc_ops;
108	apcs->mbox.chans = apcs->mbox_chans;
109	apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
110
111	ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
112	if (ret) {
113		dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
114		return ret;
115	}
116
117	if (apcs_data->clk_name) {
118		struct device_node *np = of_get_child_by_name(pdev->dev.of_node,
119							      "clock-controller");
120		struct platform_device_info pdevinfo = {
121			.parent = &pdev->dev,
122			.name = apcs_data->clk_name,
123			.id = PLATFORM_DEVID_AUTO,
124			.fwnode = of_fwnode_handle(np) ?: pdev->dev.fwnode,
125			.of_node_reused = !np,
126		};
127
128		apcs->clk = platform_device_register_full(&pdevinfo);
129		of_node_put(np);
130		if (IS_ERR(apcs->clk))
131			dev_err(&pdev->dev, "failed to register APCS clk\n");
132	}
133
134	platform_set_drvdata(pdev, apcs);
135
136	return 0;
137}
138
139static void qcom_apcs_ipc_remove(struct platform_device *pdev)
140{
141	struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
142	struct platform_device *clk = apcs->clk;
143
144	platform_device_unregister(clk);
145}
146
147/* .data is the offset of the ipc register within the global block */
148static const struct of_device_id qcom_apcs_ipc_of_match[] = {
149	{ .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
150	{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
151	{ .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
152	{ .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
153	{ .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
154	{ .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
155	{ .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data },
156	{ .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
157	{ .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
158	/* Do not add any more entries using existing driver data */
159	{ .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data },
160	{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data },
161	{ .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
162	{ .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data },
163	{ .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data },
164	{ .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data },
165	{ .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data },
166	{ .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data },
167	{ .compatible = "qcom,ipq5424-apcs-apps-global", .data = &msm8994_apcs_data },
168	{ .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data },
169	{ .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
170	{ .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
171	{ .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
172	{}
173};
174MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
175
176static struct platform_driver qcom_apcs_ipc_driver = {
177	.probe = qcom_apcs_ipc_probe,
178	.remove = qcom_apcs_ipc_remove,
179	.driver = {
180		.name = "qcom_apcs_ipc",
181		.of_match_table = qcom_apcs_ipc_of_match,
182	},
183};
184
185static int __init qcom_apcs_ipc_init(void)
186{
187	return platform_driver_register(&qcom_apcs_ipc_driver);
188}
189postcore_initcall(qcom_apcs_ipc_init);
190
191static void __exit qcom_apcs_ipc_exit(void)
192{
193	platform_driver_unregister(&qcom_apcs_ipc_driver);
194}
195module_exit(qcom_apcs_ipc_exit);
196
197MODULE_LICENSE("GPL v2");
198MODULE_DESCRIPTION("Qualcomm APCS IPC driver");