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 ipq8074_apcs_data = {
 37	.offset = 8, .clk_name = NULL
 38};
 39
 40static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
 41	.offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
 42};
 43
 44static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
 45	.offset = 8, .clk_name = NULL
 46};
 47
 48static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
 49	.offset = 16, .clk_name = NULL
 50};
 51
 52static const struct qcom_apcs_ipc_data msm8998_apcs_data = {
 53	.offset = 8, .clk_name = NULL
 54};
 55
 56static const struct qcom_apcs_ipc_data sdm660_apcs_data = {
 57	.offset = 8, .clk_name = NULL
 58};
 59
 60static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
 61	.offset = 12, .clk_name = NULL
 62};
 63
 64static const struct regmap_config apcs_regmap_config = {
 65	.reg_bits = 32,
 66	.reg_stride = 4,
 67	.val_bits = 32,
 68	.max_register = 0xFFC,
 69	.fast_io = true,
 70};
 71
 72static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
 73{
 74	struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
 75						  struct qcom_apcs_ipc, mbox);
 76	unsigned long idx = (unsigned long)chan->con_priv;
 77
 78	return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
 79}
 80
 81static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
 82	.send_data = qcom_apcs_ipc_send_data,
 83};
 84
 85static int qcom_apcs_ipc_probe(struct platform_device *pdev)
 86{
 87	struct qcom_apcs_ipc *apcs;
 88	const struct qcom_apcs_ipc_data *apcs_data;
 89	struct regmap *regmap;
 90	struct resource *res;
 91	void __iomem *base;
 92	unsigned long i;
 93	int ret;
 94
 95	apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
 96	if (!apcs)
 97		return -ENOMEM;
 98
 99	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
100	base = devm_ioremap_resource(&pdev->dev, res);
101	if (IS_ERR(base))
102		return PTR_ERR(base);
103
104	regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
105	if (IS_ERR(regmap))
106		return PTR_ERR(regmap);
107
108	apcs_data = of_device_get_match_data(&pdev->dev);
109
110	apcs->regmap = regmap;
111	apcs->offset = apcs_data->offset;
112
113	/* Initialize channel identifiers */
114	for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
115		apcs->mbox_chans[i].con_priv = (void *)i;
116
117	apcs->mbox.dev = &pdev->dev;
118	apcs->mbox.ops = &qcom_apcs_ipc_ops;
119	apcs->mbox.chans = apcs->mbox_chans;
120	apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
121
122	ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
123	if (ret) {
124		dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
125		return ret;
126	}
127
128	if (apcs_data->clk_name) {
129		apcs->clk = platform_device_register_data(&pdev->dev,
130							  apcs_data->clk_name,
131							  PLATFORM_DEVID_NONE,
132							  NULL, 0);
133		if (IS_ERR(apcs->clk))
134			dev_err(&pdev->dev, "failed to register APCS clk\n");
135	}
136
137	platform_set_drvdata(pdev, apcs);
138
139	return 0;
140}
141
142static int qcom_apcs_ipc_remove(struct platform_device *pdev)
143{
144	struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
145	struct platform_device *clk = apcs->clk;
146
147	platform_device_unregister(clk);
148
149	return 0;
150}
151
152/* .data is the offset of the ipc register within the global block */
153static const struct of_device_id qcom_apcs_ipc_of_match[] = {
154	{ .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
155	{ .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data },
156	{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
157	{ .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
158	{ .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
159	{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data },
160	{ .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
161	{ .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
162	{ .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data },
163	{ .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
164	{ .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
165	{}
166};
167MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
168
169static struct platform_driver qcom_apcs_ipc_driver = {
170	.probe = qcom_apcs_ipc_probe,
171	.remove = qcom_apcs_ipc_remove,
172	.driver = {
173		.name = "qcom_apcs_ipc",
174		.of_match_table = qcom_apcs_ipc_of_match,
175	},
176};
177
178static int __init qcom_apcs_ipc_init(void)
179{
180	return platform_driver_register(&qcom_apcs_ipc_driver);
181}
182postcore_initcall(qcom_apcs_ipc_init);
183
184static void __exit qcom_apcs_ipc_exit(void)
185{
186	platform_driver_unregister(&qcom_apcs_ipc_driver);
187}
188module_exit(qcom_apcs_ipc_exit);
189
190MODULE_LICENSE("GPL v2");
191MODULE_DESCRIPTION("Qualcomm APCS IPC driver");