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