M7350/bootable/bootloader/lk/platform/msm_shared/clock_pll.c

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2024-09-09 08:52:07 +00:00
/*
* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of The Linux Foundation nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <debug.h>
#include <reg.h>
#include <err.h>
#include <bits.h>
#include <limits.h>
#include <platform/timer.h>
#include <clock.h>
#include <clock_pll.h>
/*
* pll_vote_clk functions
*/
int pll_vote_clk_enable(struct clk *clk)
{
uint32_t ena;
struct pll_vote_clk *pll = to_pll_vote_clk(clk);
ena = readl_relaxed(pll->en_reg);
ena |= pll->en_mask;
writel_relaxed(ena, pll->en_reg);
/* Wait until PLL is enabled */
while ((readl_relaxed(pll->status_reg) & pll->status_mask) == 0);
return 0;
}
void pll_vote_clk_disable(struct clk *clk)
{
uint32_t ena;
struct pll_vote_clk *pll = to_pll_vote_clk(clk);
ena = readl_relaxed(pll->en_reg);
ena &= ~(pll->en_mask);
writel_relaxed(ena, pll->en_reg);
}
unsigned pll_vote_clk_get_rate(struct clk *clk)
{
struct pll_vote_clk *pll = to_pll_vote_clk(clk);
return pll->rate;
}
struct clk *pll_vote_clk_get_parent(struct clk *clk)
{
struct pll_vote_clk *pll = to_pll_vote_clk(clk);
return pll->parent;
}
int pll_vote_clk_is_enabled(struct clk *clk)
{
struct pll_vote_clk *pll = to_pll_vote_clk(clk);
return !!(readl_relaxed(pll->status_reg) & pll->status_mask);
}
/*
* PLLs functions
*/
int pll_clk_enable(struct clk *clk)
{
uint32_t mode;
struct pll_clk *pll = to_pll_clk(clk);
mode = readl_relaxed(pll->mode_reg);
/* Disable PLL bypass mode. */
mode |= BIT(1);
writel_relaxed(mode, pll->mode_reg);
/*
* H/W requires a 5us delay between disabling the bypass and
* de-asserting the reset. Delay 10us just to be safe.
*/
udelay(10);
/* De-assert active-low PLL reset. */
mode |= BIT(2);
writel_relaxed(mode, pll->mode_reg);
/* Wait until PLL is locked. */
udelay(50);
/* Enable PLL output. */
mode |= BIT(0);
writel_relaxed(mode, pll->mode_reg);
return 0;
}
void pll_clk_disable(struct clk *clk)
{
uint32_t mode;
struct pll_clk *pll = to_pll_clk(clk);
/*
* Disable the PLL output, disable test mode, enable
* the bypass mode, and assert the reset.
*/
mode = readl_relaxed(pll->mode_reg);
mode &= ~BM(3, 0);
writel_relaxed(mode, pll->mode_reg);
}
unsigned pll_clk_get_rate(struct clk *clk)
{
struct pll_clk *pll = to_pll_clk(clk);
return pll->rate;
}
struct clk *pll_clk_get_parent(struct clk *clk)
{
struct pll_clk *pll = to_pll_clk(clk);
return pll->parent;
}