drivers/mailbox/qcom-apcs-ipc-mailbox.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2017, Linaro Ltd
0004  */
0005
0006 #include <linux/kernel.h>
0007 #include <linux/module.h>
0008 #include <linux/io.h>
0009 #include <linux/slab.h>
0010 #include <linux/of.h>
0011 #include <linux/of_platform.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/regmap.h>
0014 #include <linux/mailbox_controller.h>
0015
0016 #define QCOM_APCS_IPC_BITS  32
0017
0018 struct qcom_apcs_ipc {
0019     struct mbox_controller mbox;
0020     struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];
0021
0022     struct regmap *regmap;
0023     unsigned long offset;
0024     struct platform_device *clk;
0025 };
0026
0027 struct qcom_apcs_ipc_data {
0028     int offset;
0029     char *clk_name;
0030 };
0031
0032 static const struct qcom_apcs_ipc_data ipq6018_apcs_data = {
0033     .offset = 8, .clk_name = "qcom,apss-ipq6018-clk"
0034 };
0035
0036 static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
0037     .offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
0038 };
0039
0040 static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
0041     .offset = 8, .clk_name = NULL
0042 };
0043
0044 static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
0045     .offset = 16, .clk_name = NULL
0046 };
0047
0048 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
0049     .offset = 12, .clk_name = NULL
0050 };
0051
0052 static const struct qcom_apcs_ipc_data sdx55_apcs_data = {
0053     .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
0054 };
0055
0056 static const struct regmap_config apcs_regmap_config = {
0057     .reg_bits = 32,
0058     .reg_stride = 4,
0059     .val_bits = 32,
0060     .max_register = 0x1008,
0061     .fast_io = true,
0062 };
0063
0064 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
0065 {
0066     struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
0067                           struct qcom_apcs_ipc, mbox);
0068     unsigned long idx = (unsigned long)chan->con_priv;
0069
0070     return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
0071 }
0072
0073 static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
0074     .send_data = qcom_apcs_ipc_send_data,
0075 };
0076
0077 static int qcom_apcs_ipc_probe(struct platform_device *pdev)
0078 {
0079     struct qcom_apcs_ipc *apcs;
0080     const struct qcom_apcs_ipc_data *apcs_data;
0081     struct regmap *regmap;
0082     void __iomem *base;
0083     unsigned long i;
0084     int ret;
0085
0086     apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
0087     if (!apcs)
0088         return -ENOMEM;
0089
0090     base = devm_platform_ioremap_resource(pdev, 0);
0091     if (IS_ERR(base))
0092         return PTR_ERR(base);
0093
0094     regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
0095     if (IS_ERR(regmap))
0096         return PTR_ERR(regmap);
0097
0098     apcs_data = of_device_get_match_data(&pdev->dev);
0099
0100     apcs->regmap = regmap;
0101     apcs->offset = apcs_data->offset;
0102
0103     /* Initialize channel identifiers */
0104     for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
0105         apcs->mbox_chans[i].con_priv = (void *)i;
0106
0107     apcs->mbox.dev = &pdev->dev;
0108     apcs->mbox.ops = &qcom_apcs_ipc_ops;
0109     apcs->mbox.chans = apcs->mbox_chans;
0110     apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
0111
0112     ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
0113     if (ret) {
0114         dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
0115         return ret;
0116     }
0117
0118     if (apcs_data->clk_name) {
0119         apcs->clk = platform_device_register_data(&pdev->dev,
0120                               apcs_data->clk_name,
0121                               PLATFORM_DEVID_AUTO,
0122                               NULL, 0);
0123         if (IS_ERR(apcs->clk))
0124             dev_err(&pdev->dev, "failed to register APCS clk\n");
0125     }
0126
0127     platform_set_drvdata(pdev, apcs);
0128
0129     return 0;
0130 }
0131
0132 static int qcom_apcs_ipc_remove(struct platform_device *pdev)
0133 {
0134     struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
0135     struct platform_device *clk = apcs->clk;
0136
0137     platform_device_unregister(clk);
0138
0139     return 0;
0140 }
0141
0142 /* .data is the offset of the ipc register within the global block */
0143 static const struct of_device_id qcom_apcs_ipc_of_match[] = {
0144     { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
0145     { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &msm8994_apcs_data },
0146     { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
0147     { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
0148     { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
0149     { .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data },
0150     { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
0151     { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
0152     { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data },
0153     { .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data },
0154     { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
0155     { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
0156     { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
0157     { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data },
0158     { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
0159     { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data },
0160     { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
0161     { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data },
0162     { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
0163     {}
0164 };
0165 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
0166
0167 static struct platform_driver qcom_apcs_ipc_driver = {
0168     .probe = qcom_apcs_ipc_probe,
0169     .remove = qcom_apcs_ipc_remove,
0170     .driver = {
0171         .name = "qcom_apcs_ipc",
0172         .of_match_table = qcom_apcs_ipc_of_match,
0173     },
0174 };
0175
0176 static int __init qcom_apcs_ipc_init(void)
0177 {
0178     return platform_driver_register(&qcom_apcs_ipc_driver);
0179 }
0180 postcore_initcall(qcom_apcs_ipc_init);
0181
0182 static void __exit qcom_apcs_ipc_exit(void)
0183 {
0184     platform_driver_unregister(&qcom_apcs_ipc_driver);
0185 }
0186 module_exit(qcom_apcs_ipc_exit);
0187
0188 MODULE_LICENSE("GPL v2");
0189 MODULE_DESCRIPTION("Qualcomm APCS IPC driver");