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-apmixed.c (2122B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2015 MediaTek Inc.
      4 * Author: James Liao <jamesjj.liao@mediatek.com>
      5 */
      6
      7#include <linux/delay.h>
      8#include <linux/module.h>
      9#include <linux/of_address.h>
     10#include <linux/slab.h>
     11
     12#include "clk-mtk.h"
     13
     14#define REF2USB_TX_EN		BIT(0)
     15#define REF2USB_TX_LPF_EN	BIT(1)
     16#define REF2USB_TX_OUT_EN	BIT(2)
     17#define REF2USB_EN_MASK		(REF2USB_TX_EN | REF2USB_TX_LPF_EN | \
     18				 REF2USB_TX_OUT_EN)
     19
     20struct mtk_ref2usb_tx {
     21	struct clk_hw	hw;
     22	void __iomem	*base_addr;
     23};
     24
     25static inline struct mtk_ref2usb_tx *to_mtk_ref2usb_tx(struct clk_hw *hw)
     26{
     27	return container_of(hw, struct mtk_ref2usb_tx, hw);
     28}
     29
     30static int mtk_ref2usb_tx_is_prepared(struct clk_hw *hw)
     31{
     32	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
     33
     34	return (readl(tx->base_addr) & REF2USB_EN_MASK) == REF2USB_EN_MASK;
     35}
     36
     37static int mtk_ref2usb_tx_prepare(struct clk_hw *hw)
     38{
     39	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
     40	u32 val;
     41
     42	val = readl(tx->base_addr);
     43
     44	val |= REF2USB_TX_EN;
     45	writel(val, tx->base_addr);
     46	udelay(100);
     47
     48	val |= REF2USB_TX_LPF_EN;
     49	writel(val, tx->base_addr);
     50
     51	val |= REF2USB_TX_OUT_EN;
     52	writel(val, tx->base_addr);
     53
     54	return 0;
     55}
     56
     57static void mtk_ref2usb_tx_unprepare(struct clk_hw *hw)
     58{
     59	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
     60	u32 val;
     61
     62	val = readl(tx->base_addr);
     63	val &= ~REF2USB_EN_MASK;
     64	writel(val, tx->base_addr);
     65}
     66
     67static const struct clk_ops mtk_ref2usb_tx_ops = {
     68	.is_prepared	= mtk_ref2usb_tx_is_prepared,
     69	.prepare	= mtk_ref2usb_tx_prepare,
     70	.unprepare	= mtk_ref2usb_tx_unprepare,
     71};
     72
     73struct clk_hw * __init mtk_clk_register_ref2usb_tx(const char *name,
     74			const char *parent_name, void __iomem *reg)
     75{
     76	struct mtk_ref2usb_tx *tx;
     77	struct clk_init_data init = {};
     78	int ret;
     79
     80	tx = kzalloc(sizeof(*tx), GFP_KERNEL);
     81	if (!tx)
     82		return ERR_PTR(-ENOMEM);
     83
     84	tx->base_addr = reg;
     85	tx->hw.init = &init;
     86
     87	init.name = name;
     88	init.ops = &mtk_ref2usb_tx_ops;
     89	init.parent_names = &parent_name;
     90	init.num_parents = 1;
     91
     92	ret = clk_hw_register(NULL, &tx->hw);
     93
     94	if (ret) {
     95		kfree(tx);
     96		return ERR_PTR(ret);
     97	}
     98
     99	return &tx->hw;
    100}
    101
    102MODULE_LICENSE("GPL");