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 static const struct regmap_config apcs_regmap_config = {
  28         .reg_bits = 32,
  29         .reg_stride = 4,
  30         .val_bits = 32,
  31         .max_register = 0x1000,
  32         .fast_io = true,
  33 };
  34
  35 static 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
  44 static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
  45         .send_data = qcom_apcs_ipc_send_data,
  46 };
  47
  48 static int qcom_apcs_ipc_probe(struct platform_device *pdev)
  49 {
  50         struct device_node *np = pdev->dev.of_node;
  51         struct qcom_apcs_ipc *apcs;
  52         struct regmap *regmap;
  53         struct resource *res;
  54         unsigned long offset;
  55         void __iomem *base;
  56         unsigned long i;
  57         int ret;
  58
  59         apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
  60         if (!apcs)
  61                 return -ENOMEM;
  62
  63         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  64         base = devm_ioremap_resource(&pdev->dev, res);
  65         if (IS_ERR(base))
  66                 return PTR_ERR(base);
  67
  68         regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
  69         if (IS_ERR(regmap))
  70                 return PTR_ERR(regmap);
  71
  72         offset = (unsigned long)of_device_get_match_data(&pdev->dev);
  73
  74         apcs->regmap = regmap;
  75         apcs->offset = offset;
  76
  77         /* Initialize channel identifiers */
  78         for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
  79                 apcs->mbox_chans[i].con_priv = (void *)i;
  80
  81         apcs->mbox.dev = &pdev->dev;
  82         apcs->mbox.ops = &qcom_apcs_ipc_ops;
  83         apcs->mbox.chans = apcs->mbox_chans;
  84         apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
  85
  86         ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
  87         if (ret) {
  88                 dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
  89                 return ret;
  90         }
  91
  92         if (of_device_is_compatible(np, "qcom,msm8916-apcs-kpss-global")) {
  93                 apcs->clk = platform_device_register_data(&pdev->dev,
  94                                                           "qcom-apcs-msm8916-clk",
  95                                                           -1, NULL, 0);
  96                 if (IS_ERR(apcs->clk))
  97                         dev_err(&pdev->dev, "failed to register APCS clk\n");
  98         }
  99
 100         platform_set_drvdata(pdev, apcs);
 101
 102         return 0;
 103 }
 104
 105 static int qcom_apcs_ipc_remove(struct platform_device *pdev)
 106 {
 107         struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
 108         struct platform_device *clk = apcs->clk;
 109
 110         platform_device_unregister(clk);
 111
 112         return 0;
 113 }
 114
 115 /* .data is the offset of the ipc register within the global block */
 116 static const struct of_device_id qcom_apcs_ipc_of_match[] = {
 117         { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
 118         { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
 119         { .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 },
 120         { .compatible = "qcom,qcs404-apcs-apps-global", .data = (void *)8 },
 121         { .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
 122         {}
 123 };
 124 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
 125
 126 static struct platform_driver qcom_apcs_ipc_driver = {
 127         .probe = qcom_apcs_ipc_probe,
 128         .remove = qcom_apcs_ipc_remove,
 129         .driver = {
 130                 .name = "qcom_apcs_ipc",
 131                 .of_match_table = qcom_apcs_ipc_of_match,
 132         },
 133 };
 134
 135 static int __init qcom_apcs_ipc_init(void)
 136 {
 137         return platform_driver_register(&qcom_apcs_ipc_driver);
 138 }
 139 postcore_initcall(qcom_apcs_ipc_init);
 140
 141 static void __exit qcom_apcs_ipc_exit(void)
 142 {
 143         platform_driver_unregister(&qcom_apcs_ipc_driver);
 144 }
 145 module_exit(qcom_apcs_ipc_exit);
 146
 147 MODULE_LICENSE("GPL v2");
 148 MODULE_DESCRIPTION("Qualcomm APCS IPC driver");