u-boot/drivers/clk/ti/clk.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* TI clock utilities
*
* Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
*/
#include <common.h>
#include <fdtdec.h>
#include <asm/io.h>
#include "clk.h"
static void clk_ti_rmw(u32 val, u32 mask, fdt_addr_t reg)
{
u32 v;
v = readl(reg);
v &= ~mask;
v |= val;
writel(v, reg);
}
void clk_ti_latch(fdt_addr_t reg, s8 shift)
{
u32 latch;
if (shift < 0)
return;
latch = 1 << shift;
clk_ti_rmw(latch, latch, reg);
clk_ti_rmw(0, latch, reg);
readl(reg); /* OCP barrier */
}