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
 27static const struct regmap_config apcs_regmap_config = {
 28	.reg_bits = 32,
 29	.reg_stride = 4,
 30	.val_bits = 32,
 31	.max_register = 0xFFC,
 32	.fast_io = true,
 33};
 34
 35static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
 36{
 37	struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
 38						  struct qcom_apcs_ipc, mbox);
 39	unsigned long idx = (unsigned long)chan->con_priv;
 40
 41	return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
 42}
 43
 44static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
 45	.send_data = qcom_apcs_ipc_send_data,
 46};
 47
 48static int qcom_apcs_ipc_probe(struct platform_device *pdev)
 49{
 50	struct qcom_apcs_ipc *apcs;
 51	struct regmap *regmap;
 52	struct resource *res;
 53	unsigned long offset;
 54	void __iomem *base;
 55	unsigned long i;
 56	int ret;
 57	const struct of_device_id apcs_clk_match_table[] = {
 58		{ .compatible = "qcom,msm8916-apcs-kpss-global", },
 59		{ .compatible = "qcom,qcs404-apcs-apps-global", },
 60		{}
 61	};
 62
 63	apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
 64	if (!apcs)
 65		return -ENOMEM;
 66
 67	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 68	base = devm_ioremap_resource(&pdev->dev, res);
 69	if (IS_ERR(base))
 70		return PTR_ERR(base);
 71
 72	regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
 73	if (IS_ERR(regmap))
 74		return PTR_ERR(regmap);
 75
 76	offset = (unsigned long)of_device_get_match_data(&pdev->dev);
 77
 78	apcs->regmap = regmap;
 79	apcs->offset = offset;
 80
 81	/* Initialize channel identifiers */
 82	for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
 83		apcs->mbox_chans[i].con_priv = (void *)i;
 84
 85	apcs->mbox.dev = &pdev->dev;
 86	apcs->mbox.ops = &qcom_apcs_ipc_ops;
 87	apcs->mbox.chans = apcs->mbox_chans;
 88	apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
 89
 90	ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
 91	if (ret) {
 92		dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
 93		return ret;
 94	}
 95
 96	if (of_match_device(apcs_clk_match_table, &pdev->dev)) {
 97		apcs->clk = platform_device_register_data(&pdev->dev,
 98							  "qcom-apcs-msm8916-clk",
 99							  PLATFORM_DEVID_NONE,
100							  NULL, 0);
101		if (IS_ERR(apcs->clk))
102			dev_err(&pdev->dev, "failed to register APCS clk\n");
103	}
104
105	platform_set_drvdata(pdev, apcs);
106
107	return 0;
108}
109
110static int qcom_apcs_ipc_remove(struct platform_device *pdev)
111{
112	struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
113	struct platform_device *clk = apcs->clk;
114
115	platform_device_unregister(clk);
116
117	return 0;
118}
119
120/* .data is the offset of the ipc register within the global block */
121static const struct of_device_id qcom_apcs_ipc_of_match[] = {
122	{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
123	{ .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
124	{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 },
125	{ .compatible = "qcom,qcs404-apcs-apps-global", .data = (void *)8 },
126	{ .compatible = "qcom,sc7180-apss-shared", .data = (void *)12 },
127	{ .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
128	{ .compatible = "qcom,sm8150-apss-shared", .data = (void *)12 },
129	{ .compatible = "qcom,ipq8074-apcs-apps-global", .data = (void *)8 },
130	{}
131};
132MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
133
134static struct platform_driver qcom_apcs_ipc_driver = {
135	.probe = qcom_apcs_ipc_probe,
136	.remove = qcom_apcs_ipc_remove,
137	.driver = {
138		.name = "qcom_apcs_ipc",
139		.of_match_table = qcom_apcs_ipc_of_match,
140	},
141};
142
143static int __init qcom_apcs_ipc_init(void)
144{
145	return platform_driver_register(&qcom_apcs_ipc_driver);
146}
147postcore_initcall(qcom_apcs_ipc_init);
148
149static void __exit qcom_apcs_ipc_exit(void)
150{
151	platform_driver_unregister(&qcom_apcs_ipc_driver);
152}
153module_exit(qcom_apcs_ipc_exit);
154
155MODULE_LICENSE("GPL v2");
156MODULE_DESCRIPTION("Qualcomm APCS IPC driver");