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
  15 static const char *aux_parents[] = {
  16         "pll8_vote",
  17         "pxo",
  18 };
  19
  20 static unsigned int aux_parent_map[] = {
  21         3,
  22         0,
  23 };
  24
  25 static 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 };
  30 MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
  31
  32 static 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
  69 static int kpss_xcc_driver_remove(struct platform_device *pdev)
  70 {
  71         clk_unregister_mux(platform_get_drvdata(pdev));
  72         return 0;
  73 }
  74
  75 static 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 };
  83 module_platform_driver(kpss_xcc_driver);
  84
  85 MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
  86 MODULE_LICENSE("GPL v2");
  87 MODULE_ALIAS("platform:kpss-xcc");