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/*
* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include "pll.h"
/* PLL type: SSC */
#define SC_PLLCTRL_SSC_DK_MASK GENMASK(14, 0)
#define SC_PLLCTRL_SSC_EN BIT(31)
#define SC_PLLCTRL2_NRSTDS BIT(28)
#define SC_PLLCTRL2_SSC_JK_MASK GENMASK(26, 0)
#define SC_PLLCTRL3_REGI_MASK GENMASK(19, 16)
/* PLL type: VPLL27 */
#define SC_VPLL27CTRL_WP BIT(0)
#define SC_VPLL27CTRL3_K_LD BIT(28)
/* PLL type: DSPLL */
#define SC_DSPLLCTRL2_K_LD BIT(28)
int uniphier_ld20_sscpll_init(unsigned long reg_base, unsigned int freq,
unsigned int ssc_rate, unsigned int divn)
{
void __iomem *base;
u32 tmp;
base = ioremap(reg_base, SZ_16);
if (!base)
return -ENOMEM;
if (freq != UNIPHIER_PLL_FREQ_DEFAULT) {
tmp = readl(base); /* SSCPLLCTRL */
tmp &= ~SC_PLLCTRL_SSC_DK_MASK;
tmp |= FIELD_PREP(SC_PLLCTRL_SSC_DK_MASK,
DIV_ROUND_CLOSEST(487UL * freq * ssc_rate,
divn * 512));
writel(tmp, base);
tmp = readl(base + 4);
tmp &= ~SC_PLLCTRL2_SSC_JK_MASK;
tmp |= FIELD_PREP(SC_PLLCTRL2_SSC_JK_MASK,
DIV_ROUND_CLOSEST(21431887UL * freq,
divn * 512));
writel(tmp, base + 4);
udelay(50);
}
tmp = readl(base + 4); /* SSCPLLCTRL2 */
tmp |= SC_PLLCTRL2_NRSTDS;
writel(tmp, base + 4);
iounmap(base);
return 0;
}
int uniphier_ld20_sscpll_ssc_en(unsigned long reg_base)
{
void __iomem *base;
u32 tmp;
base = ioremap(reg_base, SZ_16);
if (!base)
return -ENOMEM;
tmp = readl(base); /* SSCPLLCTRL */
tmp |= SC_PLLCTRL_SSC_EN;
writel(tmp, base);
iounmap(base);
return 0;
}
int uniphier_ld20_sscpll_set_regi(unsigned long reg_base, unsigned regi)
{
void __iomem *base;
u32 tmp;
base = ioremap(reg_base, SZ_16);
if (!base)
return -ENOMEM;
tmp = readl(base + 8); /* SSCPLLCTRL3 */
tmp &= ~SC_PLLCTRL3_REGI_MASK;
tmp |= FIELD_PREP(SC_PLLCTRL3_REGI_MASK, regi);
writel(tmp, base + 8);
iounmap(base);
return 0;
}
int uniphier_ld20_vpll27_init(unsigned long reg_base)
{
void __iomem *base;
u32 tmp;
base = ioremap(reg_base, SZ_16);
if (!base)
return -ENOMEM;
tmp = readl(base); /* VPLL27CTRL */
tmp |= SC_VPLL27CTRL_WP; /* write protect off */
writel(tmp, base);
tmp = readl(base + 8); /* VPLL27CTRL3 */
tmp |= SC_VPLL27CTRL3_K_LD;
writel(tmp, base + 8);
tmp = readl(base); /* VPLL27CTRL */
tmp &= ~SC_VPLL27CTRL_WP; /* write protect on */
writel(tmp, base);
iounmap(base);
return 0;
}
int uniphier_ld20_dspll_init(unsigned long reg_base)
{
void __iomem *base;
u32 tmp;
base = ioremap(reg_base, SZ_16);
if (!base)
return -ENOMEM;
tmp = readl(base + 4); /* DSPLLCTRL2 */
tmp |= SC_DSPLLCTRL2_K_LD;
writel(tmp, base + 4);
iounmap(base);
return 0;
}
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