xref: /openbmc/u-boot/arch/arm/mach-uniphier/clk/pll-ld4.c (revision e8f80a5a)

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2013-2014 Panasonic Corporation
 * Copyright (C) 2015-2016 Socionext Inc.
 */

#include <linux/delay.h>
#include <linux/io.h>

#include "../init.h"
#include "../sc-regs.h"
#include "../sg-regs.h"
#include "pll.h"

static void upll_init(void)
{
	u32 tmp, clk_mode_upll, clk_mode_axosel;

	tmp = readl(SG_PINMON0);
	clk_mode_upll   = tmp & SG_PINMON0_CLK_MODE_UPLLSRC_MASK;
	clk_mode_axosel = tmp & SG_PINMON0_CLK_MODE_AXOSEL_MASK;

	/* set 0 to SNRT(UPLLCTRL.bit28) and K_LD(UPLLCTRL.bit[27]) */
	tmp = readl(SC_UPLLCTRL);
	tmp &= ~0x18000000;
	writel(tmp, SC_UPLLCTRL);

	if (clk_mode_upll == SG_PINMON0_CLK_MODE_UPLLSRC_DEFAULT) {
		if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ_U ||
		    clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ_A) {
			/* AXO: 25MHz */
			tmp &= ~0x07ffffff;
			tmp |= 0x0228f5c0;
		} else {
			/* AXO: default 24.576MHz */
			tmp &= ~0x07ffffff;
			tmp |= 0x02328000;
		}
	}

	writel(tmp, SC_UPLLCTRL);

	/* set 1 to K_LD(UPLLCTRL.bit[27]) */
	tmp |= 0x08000000;
	writel(tmp, SC_UPLLCTRL);

	/* wait 10 usec */
	udelay(10);

	/* set 1 to SNRT(UPLLCTRL.bit[28]) */
	tmp |= 0x10000000;
	writel(tmp, SC_UPLLCTRL);
}

static void vpll_init(void)
{
	u32 tmp, clk_mode_axosel;

	tmp = readl(SG_PINMON0);
	clk_mode_axosel = tmp & SG_PINMON0_CLK_MODE_AXOSEL_MASK;

	/* set 1 to VPLA27WP and VPLA27WP */
	tmp = readl(SC_VPLL27ACTRL);
	tmp |= 0x00000001;
	writel(tmp, SC_VPLL27ACTRL);
	tmp = readl(SC_VPLL27BCTRL);
	tmp |= 0x00000001;
	writel(tmp, SC_VPLL27BCTRL);

	/* Set 0 to VPLA_K_LD and VPLB_K_LD */
	tmp = readl(SC_VPLL27ACTRL3);
	tmp &= ~0x10000000;
	writel(tmp, SC_VPLL27ACTRL3);
	tmp = readl(SC_VPLL27BCTRL3);
	tmp &= ~0x10000000;
	writel(tmp, SC_VPLL27BCTRL3);

	/* Set 0 to VPLA_SNRST and VPLB_SNRST */
	tmp = readl(SC_VPLL27ACTRL2);
	tmp &= ~0x10000000;
	writel(tmp, SC_VPLL27ACTRL2);
	tmp = readl(SC_VPLL27BCTRL2);
	tmp &= ~0x10000000;
	writel(tmp, SC_VPLL27BCTRL2);

	/* Set 0x20 to VPLA_SNRST and VPLB_SNRST */
	tmp = readl(SC_VPLL27ACTRL2);
	tmp &= ~0x0000007f;
	tmp |= 0x00000020;
	writel(tmp, SC_VPLL27ACTRL2);
	tmp = readl(SC_VPLL27BCTRL2);
	tmp &= ~0x0000007f;
	tmp |= 0x00000020;
	writel(tmp, SC_VPLL27BCTRL2);

	if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ_U ||
	    clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ_A) {
		/* AXO: 25MHz */
		tmp = readl(SC_VPLL27ACTRL3);
		tmp &= ~0x000fffff;
		tmp |= 0x00066664;
		writel(tmp, SC_VPLL27ACTRL3);
		tmp = readl(SC_VPLL27BCTRL3);
		tmp &= ~0x000fffff;
		tmp |= 0x00066664;
		writel(tmp, SC_VPLL27BCTRL3);
	} else {
		/* AXO: default 24.576MHz */
		tmp = readl(SC_VPLL27ACTRL3);
		tmp &= ~0x000fffff;
		tmp |= 0x000f5800;
		writel(tmp, SC_VPLL27ACTRL3);
		tmp = readl(SC_VPLL27BCTRL3);
		tmp &= ~0x000fffff;
		tmp |= 0x000f5800;
		writel(tmp, SC_VPLL27BCTRL3);
	}

	/* Set 1 to VPLA_K_LD and VPLB_K_LD */
	tmp = readl(SC_VPLL27ACTRL3);
	tmp |= 0x10000000;
	writel(tmp, SC_VPLL27ACTRL3);
	tmp = readl(SC_VPLL27BCTRL3);
	tmp |= 0x10000000;
	writel(tmp, SC_VPLL27BCTRL3);

	/* wait 10 usec */
	udelay(10);

	/* Set 0 to VPLA_SNRST and VPLB_SNRST */
	tmp = readl(SC_VPLL27ACTRL2);
	tmp |= 0x10000000;
	writel(tmp, SC_VPLL27ACTRL2);
	tmp = readl(SC_VPLL27BCTRL2);
	tmp |= 0x10000000;
	writel(tmp, SC_VPLL27BCTRL2);

	/* set 0 to VPLA27WP and VPLA27WP */
	tmp = readl(SC_VPLL27ACTRL);
	tmp &= ~0x00000001;
	writel(tmp, SC_VPLL27ACTRL);
	tmp = readl(SC_VPLL27BCTRL);
	tmp |= ~0x00000001;
	writel(tmp, SC_VPLL27BCTRL);
}

void uniphier_ld4_pll_init(void)
{
	upll_init();
	vpll_init();
	uniphier_ld4_dpll_ssc_en();
}