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/property.h>
   9 #include <linux/err.h>
  10 #include <linux/io.h>
  11 #include <linux/of.h>
  12 #include <linux/clk.h>
  13 #include <linux/clk-provider.h>
  14
  15 static const struct clk_parent_data aux_parents[] = {
  16         { .fw_name = "pll8_vote", .name = "pll8_vote" },
  17         { .fw_name = "pxo", .name = "pxo_board" },
  18 };
  19
  20 static const u32 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         struct device *dev = &pdev->dev;
  35         void __iomem *base;
  36         struct clk_hw *hw;
  37         const char *name;
  38
  39         base = devm_platform_ioremap_resource(pdev, 0);
  40         if (IS_ERR(base))
  41                 return PTR_ERR(base);
  42
  43         if (device_get_match_data(&pdev->dev)) {
  44                 if (of_property_read_string_index(dev->of_node,
  45                                                   "clock-output-names",
  46                                                   0, &name))
  47                         return -ENODEV;
  48                 base += 0x14;
  49         } else {
  50                 name = "acpu_l2_aux";
  51                 base += 0x28;
  52         }
  53
  54         hw = devm_clk_hw_register_mux_parent_data_table(dev, name, aux_parents,
  55                                                         ARRAY_SIZE(aux_parents), 0,
  56                                                         base, 0, 0x3,
  57                                                         0, aux_parent_map, NULL);
  58         if (IS_ERR(hw))
  59                 return PTR_ERR(hw);
  60
  61         of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get, hw);
  62
  63         return 0;
  64 }
  65
  66 static struct platform_driver kpss_xcc_driver = {
  67         .probe = kpss_xcc_driver_probe,
  68         .driver = {
  69                 .name = "kpss-xcc",
  70                 .of_match_table = kpss_xcc_match_table,
  71         },
  72 };
  73 module_platform_driver(kpss_xcc_driver);
  74
  75 MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
  76 MODULE_LICENSE("GPL v2");
  77 MODULE_ALIAS("platform:kpss-xcc");