LXR linux/drivers/clk/qcom/kpss-xcc.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (c) 2018, The Linux Foundation. All rights reserved.
   3
   4#include <linux/kernel.h>
   5#include <linux/init.h>
   6#include <linux/module.h>
   7#include <linux/platform_device.h>
   8#include <linux/err.h>
   9#include <linux/io.h>
  10#include <linux/of.h>
  11#include <linux/of_device.h>
  12#include <linux/clk.h>
  13#include <linux/clk-provider.h>
  14
  15static const char *aux_parents[] = {
  16        "pll8_vote",
  17        "pxo",
  18};
  19
  20static unsigned int aux_parent_map[] = {
  21        3,
  22        0,
  23};
  24
  25static const struct of_device_id kpss_xcc_match_table[] = {
  26        { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
  27        { .compatible = "qcom,kpss-gcc" },
  28        {}
  29};
  30MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
  31
  32static int kpss_xcc_driver_probe(struct platform_device *pdev)
  33{
  34        const struct of_device_id *id;
  35        struct clk *clk;
  36        struct resource *res;
  37        void __iomem *base;
  38        const char *name;
  39
  40        id = of_match_device(kpss_xcc_match_table, &pdev->dev);
  41        if (!id)
  42                return -ENODEV;
  43
  44        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  45        base = devm_ioremap_resource(&pdev->dev, res);
  46        if (IS_ERR(base))
  47                return PTR_ERR(base);
  48
  49        if (id->data) {
  50                if (of_property_read_string_index(pdev->dev.of_node,
  51                                                  "clock-output-names",
  52                                                  0, &name))
  53                        return -ENODEV;
  54                base += 0x14;
  55        } else {
  56                name = "acpu_l2_aux";
  57                base += 0x28;
  58        }
  59
  60        clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
  61                                     ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
  62                                     0, aux_parent_map, NULL);
  63
  64        platform_set_drvdata(pdev, clk);
  65
  66        return PTR_ERR_OR_ZERO(clk);
  67}
  68
  69static int kpss_xcc_driver_remove(struct platform_device *pdev)
  70{
  71        clk_unregister_mux(platform_get_drvdata(pdev));
  72        return 0;
  73}
  74
  75static struct platform_driver kpss_xcc_driver = {
  76        .probe = kpss_xcc_driver_probe,
  77        .remove = kpss_xcc_driver_remove,
  78        .driver = {
  79                .name = "kpss-xcc",
  80                .of_match_table = kpss_xcc_match_table,
  81        },
  82};
  83module_platform_driver(kpss_xcc_driver);
  84
  85MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
  86MODULE_LICENSE("GPL v2");
  87MODULE_ALIAS("platform:kpss-xcc");
  88