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-impd1.c (3283B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Clock driver for the ARM Integrator/IM-PD1 board
      4 * Copyright (C) 2012-2013 Linus Walleij
      5 */
      6#include <linux/clk-provider.h>
      7#include <linux/clkdev.h>
      8#include <linux/err.h>
      9#include <linux/io.h>
     10#include <linux/platform_device.h>
     11#include <linux/module.h>
     12#include <linux/mfd/syscon.h>
     13#include <linux/regmap.h>
     14
     15#include "icst.h"
     16#include "clk-icst.h"
     17
     18#define IMPD1_OSC1	0x00
     19#define IMPD1_OSC2	0x04
     20#define IMPD1_LOCK	0x08
     21
     22/*
     23 * There are two VCO's on the IM-PD1
     24 */
     25
     26static const struct icst_params impd1_vco1_params = {
     27	.ref		= 24000000,	/* 24 MHz */
     28	.vco_max	= ICST525_VCO_MAX_3V,
     29	.vco_min	= ICST525_VCO_MIN,
     30	.vd_min		= 12,
     31	.vd_max		= 519,
     32	.rd_min		= 3,
     33	.rd_max		= 120,
     34	.s2div		= icst525_s2div,
     35	.idx2s		= icst525_idx2s,
     36};
     37
     38static const struct clk_icst_desc impd1_icst1_desc = {
     39	.params = &impd1_vco1_params,
     40	.vco_offset = IMPD1_OSC1,
     41	.lock_offset = IMPD1_LOCK,
     42};
     43
     44static const struct icst_params impd1_vco2_params = {
     45	.ref		= 24000000,	/* 24 MHz */
     46	.vco_max	= ICST525_VCO_MAX_3V,
     47	.vco_min	= ICST525_VCO_MIN,
     48	.vd_min		= 12,
     49	.vd_max		= 519,
     50	.rd_min		= 3,
     51	.rd_max		= 120,
     52	.s2div		= icst525_s2div,
     53	.idx2s		= icst525_idx2s,
     54};
     55
     56static const struct clk_icst_desc impd1_icst2_desc = {
     57	.params = &impd1_vco2_params,
     58	.vco_offset = IMPD1_OSC2,
     59	.lock_offset = IMPD1_LOCK,
     60};
     61
     62static int integrator_impd1_clk_spawn(struct device *dev,
     63				      struct device_node *parent,
     64				      struct device_node *np)
     65{
     66	struct regmap *map;
     67	struct clk *clk = ERR_PTR(-EINVAL);
     68	const char *name = np->name;
     69	const char *parent_name;
     70	const struct clk_icst_desc *desc;
     71	int ret;
     72
     73	map = syscon_node_to_regmap(parent);
     74	if (IS_ERR(map)) {
     75		pr_err("no regmap for syscon IM-PD1 ICST clock parent\n");
     76		return PTR_ERR(map);
     77	}
     78
     79	if (of_device_is_compatible(np, "arm,impd1-vco1")) {
     80		desc = &impd1_icst1_desc;
     81	} else if (of_device_is_compatible(np, "arm,impd1-vco2")) {
     82		desc = &impd1_icst2_desc;
     83	} else {
     84		dev_err(dev, "not a clock node %s\n", name);
     85		return -ENODEV;
     86	}
     87
     88	of_property_read_string(np, "clock-output-names", &name);
     89	parent_name = of_clk_get_parent_name(np, 0);
     90	clk = icst_clk_setup(NULL, desc, name, parent_name, map,
     91			     ICST_INTEGRATOR_IM_PD1);
     92	if (!IS_ERR(clk)) {
     93		of_clk_add_provider(np, of_clk_src_simple_get, clk);
     94		ret = 0;
     95	} else {
     96		dev_err(dev, "error setting up IM-PD1 ICST clock\n");
     97		ret = PTR_ERR(clk);
     98	}
     99
    100	return ret;
    101}
    102
    103static int integrator_impd1_clk_probe(struct platform_device *pdev)
    104{
    105	struct device *dev = &pdev->dev;
    106	struct device_node *np = dev->of_node;
    107	struct device_node *child;
    108	int ret = 0;
    109
    110	for_each_available_child_of_node(np, child) {
    111		ret = integrator_impd1_clk_spawn(dev, np, child);
    112		if (ret) {
    113			of_node_put(child);
    114			break;
    115		}
    116	}
    117
    118	return ret;
    119}
    120
    121static const struct of_device_id impd1_syscon_match[] = {
    122	{ .compatible = "arm,im-pd1-syscon", },
    123	{}
    124};
    125MODULE_DEVICE_TABLE(of, impd1_syscon_match);
    126
    127static struct platform_driver impd1_clk_driver = {
    128	.driver = {
    129		.name = "impd1-clk",
    130		.of_match_table = impd1_syscon_match,
    131	},
    132	.probe  = integrator_impd1_clk_probe,
    133};
    134builtin_platform_driver(impd1_clk_driver);
    135
    136MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
    137MODULE_DESCRIPTION("Arm IM-PD1 module clock driver");
    138MODULE_LICENSE("GPL v2");