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/*
* This file is part of the coreboot project.
*
* Copyright 2018 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <device/mmio.h>
#include <assert.h>
#include <soc/pll.h>
#define GENMASK(h, l) (BIT(h + 1) - BIT(l))
void mux_set_sel(const struct mux *mux, u32 sel)
{
u32 mask = GENMASK(mux->mux_width - 1, 0);
u32 val = read32(mux->reg);
val &= ~(mask << mux->mux_shift);
val |= (sel & mask) << mux->mux_shift;
write32(mux->reg, val);
if (mux->upd_reg)
write32(mux->upd_reg, 1 << mux->upd_shift);
}
static void pll_calc_values(const struct pll *pll, u32 *pcw, u32 *postdiv,
u32 freq)
{
const u32 fin_hz = CLK26M_HZ;
const u32 *div_rate = pll->div_rate;
u32 val;
assert(freq <= div_rate[0]);
assert(freq >= 1 * GHz / 16);
for (val = 1; div_rate[val] != 0; val++) {
if (freq > div_rate[val])
break;
}
val--;
*postdiv = val;
/* _pcw = freq * 2^postdiv / fin * 2^pcwbits_fractional */
val += pll->pcwbits - PCW_INTEGER_BITS;
*pcw = ((u64)freq << val) / fin_hz;
}
static void pll_set_rate_regs(const struct pll *pll, u32 pcw, u32 postdiv)
{
u32 val;
/* set postdiv */
val = read32(pll->div_reg);
val &= ~(PLL_POSTDIV_MASK << pll->div_shift);
val |= postdiv << pll->div_shift;
/* set postdiv and pcw at the same time if on the same register */
if (pll->div_reg != pll->pcw_reg) {
write32(pll->div_reg, val);
val = read32(pll->pcw_reg);
}
/* set pcw */
val &= ~GENMASK(pll->pcw_shift + pll->pcwbits - 1, pll->pcw_shift);
val |= pcw << pll->pcw_shift;
write32(pll->pcw_reg, val);
pll_set_pcw_change(pll);
}
int pll_set_rate(const struct pll *pll, u32 rate)
{
u32 pcw, postdiv;
pll_calc_values(pll, &pcw, &postdiv, rate);
pll_set_rate_regs(pll, pcw, postdiv);
return 0;
}
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