drivers/mailbox/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
  18 struct 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
  27 struct qcom_apcs_ipc_data {
  28         int offset;
  29         char *clk_name;
  30 };
  31
  32 static const struct qcom_apcs_ipc_data ipq6018_apcs_data = {
  33         .offset = 8, .clk_name = "qcom,apss-ipq6018-clk"
  34 };
  35
  36 static const struct qcom_apcs_ipc_data ipq8074_apcs_data = {
  37         .offset = 8, .clk_name = NULL
  38 };
  39
  40 static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
  41         .offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
  42 };
  43
  44 static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
  45         .offset = 8, .clk_name = NULL
  46 };
  47
  48 static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
  49         .offset = 16, .clk_name = NULL
  50 };
  51
  52 static const struct qcom_apcs_ipc_data msm8998_apcs_data = {
  53         .offset = 8, .clk_name = NULL
  54 };
  55
  56 static const struct qcom_apcs_ipc_data sdm660_apcs_data = {
  57         .offset = 8, .clk_name = NULL
  58 };
  59
  60 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
  61         .offset = 12, .clk_name = NULL
  62 };
  63
  64 static 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
  72 static 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
  81 static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
  82         .send_data = qcom_apcs_ipc_send_data,
  83 };
  84
  85 static 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
 142 static 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 */
 153 static 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 };
 167 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
 168
 169 static 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
 178 static int __init qcom_apcs_ipc_init(void)
 179 {
 180         return platform_driver_register(&qcom_apcs_ipc_driver);
 181 }
 182 postcore_initcall(qcom_apcs_ipc_init);
 183
 184 static void __exit qcom_apcs_ipc_exit(void)
 185 {
 186         platform_driver_unregister(&qcom_apcs_ipc_driver);
 187 }
 188 module_exit(qcom_apcs_ipc_exit);
 189
 190 MODULE_LICENSE("GPL v2");
 191 MODULE_DESCRIPTION("Qualcomm APCS IPC driver");