cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kpss-xcc.c (1955B)

      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 const u32 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	void __iomem *base;
     37	const char *name;
     38
     39	id = of_match_device(kpss_xcc_match_table, &pdev->dev);
     40	if (!id)
     41		return -ENODEV;
     42
     43	base = devm_platform_ioremap_resource(pdev, 0);
     44	if (IS_ERR(base))
     45		return PTR_ERR(base);
     46
     47	if (id->data) {
     48		if (of_property_read_string_index(pdev->dev.of_node,
     49						  "clock-output-names",
     50						  0, &name))
     51			return -ENODEV;
     52		base += 0x14;
     53	} else {
     54		name = "acpu_l2_aux";
     55		base += 0x28;
     56	}
     57
     58	clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
     59				     ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
     60				     0, aux_parent_map, NULL);
     61
     62	platform_set_drvdata(pdev, clk);
     63
     64	return PTR_ERR_OR_ZERO(clk);
     65}
     66
     67static int kpss_xcc_driver_remove(struct platform_device *pdev)
     68{
     69	clk_unregister_mux(platform_get_drvdata(pdev));
     70	return 0;
     71}
     72
     73static struct platform_driver kpss_xcc_driver = {
     74	.probe = kpss_xcc_driver_probe,
     75	.remove = kpss_xcc_driver_remove,
     76	.driver = {
     77		.name = "kpss-xcc",
     78		.of_match_table = kpss_xcc_match_table,
     79	},
     80};
     81module_platform_driver(kpss_xcc_driver);
     82
     83MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
     84MODULE_LICENSE("GPL v2");
     85MODULE_ALIAS("platform:kpss-xcc");