linux/drivers/mailbox/qcom-apcs-ipc-mailbox.c
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   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 qcom_apcs_ipc_data sdx55_apcs_data = {
  65        .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
  66};
  67
  68static const struct regmap_config apcs_regmap_config = {
  69        .reg_bits = 32,
  70        .reg_stride = 4,
  71        .val_bits = 32,
  72        .max_register = 0x1008,
  73        .fast_io = true,
  74};
  75
  76static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
  77{
  78        struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
  79                                                  struct qcom_apcs_ipc, mbox);
  80        unsigned long idx = (unsigned long)chan->con_priv;
  81
  82        return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
  83}
  84
  85static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
  86        .send_data = qcom_apcs_ipc_send_data,
  87};
  88
  89static int qcom_apcs_ipc_probe(struct platform_device *pdev)
  90{
  91        struct qcom_apcs_ipc *apcs;
  92        const struct qcom_apcs_ipc_data *apcs_data;
  93        struct regmap *regmap;
  94        struct resource *res;
  95        void __iomem *base;
  96        unsigned long i;
  97        int ret;
  98
  99        apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
 100        if (!apcs)
 101                return -ENOMEM;
 102
 103        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 104        base = devm_ioremap_resource(&pdev->dev, res);
 105        if (IS_ERR(base))
 106                return PTR_ERR(base);
 107
 108        regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
 109        if (IS_ERR(regmap))
 110                return PTR_ERR(regmap);
 111
 112        apcs_data = of_device_get_match_data(&pdev->dev);
 113
 114        apcs->regmap = regmap;
 115        apcs->offset = apcs_data->offset;
 116
 117        /* Initialize channel identifiers */
 118        for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
 119                apcs->mbox_chans[i].con_priv = (void *)i;
 120
 121        apcs->mbox.dev = &pdev->dev;
 122        apcs->mbox.ops = &qcom_apcs_ipc_ops;
 123        apcs->mbox.chans = apcs->mbox_chans;
 124        apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
 125
 126        ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
 127        if (ret) {
 128                dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
 129                return ret;
 130        }
 131
 132        if (apcs_data->clk_name) {
 133                apcs->clk = platform_device_register_data(&pdev->dev,
 134                                                          apcs_data->clk_name,
 135                                                          PLATFORM_DEVID_AUTO,
 136                                                          NULL, 0);
 137                if (IS_ERR(apcs->clk))
 138                        dev_err(&pdev->dev, "failed to register APCS clk\n");
 139        }
 140
 141        platform_set_drvdata(pdev, apcs);
 142
 143        return 0;
 144}
 145
 146static int qcom_apcs_ipc_remove(struct platform_device *pdev)
 147{
 148        struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
 149        struct platform_device *clk = apcs->clk;
 150
 151        platform_device_unregister(clk);
 152
 153        return 0;
 154}
 155
 156/* .data is the offset of the ipc register within the global block */
 157static const struct of_device_id qcom_apcs_ipc_of_match[] = {
 158        { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
 159        { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data },
 160        { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
 161        { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
 162        { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
 163        { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data },
 164        { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
 165        { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
 166        { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
 167        { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data },
 168        { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
 169        { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
 170        { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
 171        {}
 172};
 173MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
 174
 175static struct platform_driver qcom_apcs_ipc_driver = {
 176        .probe = qcom_apcs_ipc_probe,
 177        .remove = qcom_apcs_ipc_remove,
 178        .driver = {
 179                .name = "qcom_apcs_ipc",
 180                .of_match_table = qcom_apcs_ipc_of_match,
 181        },
 182};
 183
 184static int __init qcom_apcs_ipc_init(void)
 185{
 186        return platform_driver_register(&qcom_apcs_ipc_driver);
 187}
 188postcore_initcall(qcom_apcs_ipc_init);
 189
 190static void __exit qcom_apcs_ipc_exit(void)
 191{
 192        platform_driver_unregister(&qcom_apcs_ipc_driver);
 193}
 194module_exit(qcom_apcs_ipc_exit);
 195
 196MODULE_LICENSE("GPL v2");
 197MODULE_DESCRIPTION("Qualcomm APCS IPC driver");
 198