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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clk-sun6i-apb0.c (1743B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2014 Free Electrons
      4 *
      5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
      6 *
      7 * Allwinner A31 APB0 clock driver
      8 */
      9
     10#include <linux/clk-provider.h>
     11#include <linux/init.h>
     12#include <linux/of.h>
     13#include <linux/platform_device.h>
     14
     15/*
     16 * The APB0 clk has a configurable divisor.
     17 *
     18 * We must use a clk_div_table and not a regular power of 2
     19 * divisor here, because the first 2 values divide the clock
     20 * by 2.
     21 */
     22static const struct clk_div_table sun6i_a31_apb0_divs[] = {
     23	{ .val = 0, .div = 2, },
     24	{ .val = 1, .div = 2, },
     25	{ .val = 2, .div = 4, },
     26	{ .val = 3, .div = 8, },
     27	{ /* sentinel */ },
     28};
     29
     30static int sun6i_a31_apb0_clk_probe(struct platform_device *pdev)
     31{
     32	struct device_node *np = pdev->dev.of_node;
     33	const char *clk_name = np->name;
     34	const char *clk_parent;
     35	void __iomem *reg;
     36	struct clk *clk;
     37
     38	reg = devm_platform_ioremap_resource(pdev, 0);
     39	if (IS_ERR(reg))
     40		return PTR_ERR(reg);
     41
     42	clk_parent = of_clk_get_parent_name(np, 0);
     43	if (!clk_parent)
     44		return -EINVAL;
     45
     46	of_property_read_string(np, "clock-output-names", &clk_name);
     47
     48	clk = clk_register_divider_table(&pdev->dev, clk_name, clk_parent,
     49					 0, reg, 0, 2, 0, sun6i_a31_apb0_divs,
     50					 NULL);
     51	if (IS_ERR(clk))
     52		return PTR_ERR(clk);
     53
     54	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
     55}
     56
     57static const struct of_device_id sun6i_a31_apb0_clk_dt_ids[] = {
     58	{ .compatible = "allwinner,sun6i-a31-apb0-clk" },
     59	{ /* sentinel */ }
     60};
     61
     62static struct platform_driver sun6i_a31_apb0_clk_driver = {
     63	.driver = {
     64		.name = "sun6i-a31-apb0-clk",
     65		.of_match_table = sun6i_a31_apb0_clk_dt_ids,
     66	},
     67	.probe = sun6i_a31_apb0_clk_probe,
     68};
     69builtin_platform_driver(sun6i_a31_apb0_clk_driver);