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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clkt2xxx_dpll.c (1290B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * OMAP2-specific DPLL control functions
      4 *
      5 * Copyright (C) 2011 Nokia Corporation
      6 * Paul Walmsley
      7 */
      8
      9#include <linux/kernel.h>
     10#include <linux/errno.h>
     11#include <linux/clk.h>
     12#include <linux/io.h>
     13
     14#include "clock.h"
     15#include "cm2xxx.h"
     16#include "cm-regbits-24xx.h"
     17
     18/* Private functions */
     19
     20/**
     21 * _allow_idle - enable DPLL autoidle bits
     22 * @clk: struct clk * of the DPLL to operate on
     23 *
     24 * Enable DPLL automatic idle control.  The DPLL will enter low-power
     25 * stop when its downstream clocks are gated.  No return value.
     26 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
     27 * instead.  Add some mechanism to optionally enter this mode.
     28 */
     29static void _allow_idle(struct clk_hw_omap *clk)
     30{
     31	if (!clk || !clk->dpll_data)
     32		return;
     33
     34	omap2xxx_cm_set_dpll_auto_low_power_stop();
     35}
     36
     37/**
     38 * _deny_idle - prevent DPLL from automatically idling
     39 * @clk: struct clk * of the DPLL to operate on
     40 *
     41 * Disable DPLL automatic idle control.  No return value.
     42 */
     43static void _deny_idle(struct clk_hw_omap *clk)
     44{
     45	if (!clk || !clk->dpll_data)
     46		return;
     47
     48	omap2xxx_cm_set_dpll_disable_autoidle();
     49}
     50
     51
     52/* Public data */
     53const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
     54	.allow_idle	= _allow_idle,
     55	.deny_idle	= _deny_idle,
     56};