arch/arm/mach-uniphier/dram/ddrphy-ld4.c

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

#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/printk.h>

#include "ddrphy-init.h"
#include "ddrphy-regs.h"

enum dram_freq {
	DRAM_FREQ_1333M,
	DRAM_FREQ_1600M,
	DRAM_FREQ_NR,
};

static u32 ddrphy_ptr0[DRAM_FREQ_NR] = {0x0a806844, 0x0c807d04};
static u32 ddrphy_ptr1[DRAM_FREQ_NR] = {0x208e0124, 0x2710015E};
static u32 ddrphy_ptr3[DRAM_FREQ_NR] = {0x0f051616, 0x12061A80};
static u32 ddrphy_ptr4[DRAM_FREQ_NR] = {0x06ae08d6, 0x08027100};
static u32 ddrphy_dtpr0[DRAM_FREQ_NR] = {0x85589955, 0x999cbb66};
static u32 ddrphy_dtpr1[DRAM_FREQ_NR] = {0x1a8363c0, 0x1a878400};
static u32 ddrphy_dtpr2[DRAM_FREQ_NR] = {0x5002c200, 0xa00214f8};
static u32 ddrphy_mr0[DRAM_FREQ_NR] = {0x00000b51, 0x00000d71};
static u32 ddrphy_mr2[DRAM_FREQ_NR] = {0x00000290, 0x00000298};

int uniphier_ld4_ddrphy_init(void __iomem *phy_base, int freq, bool ddr3plus)
{
	enum dram_freq freq_e;
	u32 tmp;

	switch (freq) {
	case 1333:
		freq_e = DRAM_FREQ_1333M;
		break;
	case 1600:
		freq_e = DRAM_FREQ_1600M;
		break;
	default:
		pr_err("unsupported DRAM frequency %d MHz\n", freq);
		return -EINVAL;
	}

	writel(0x0300c473, phy_base + PHY_PGCR1);
	writel(ddrphy_ptr0[freq_e], phy_base + PHY_PTR0);
	writel(ddrphy_ptr1[freq_e], phy_base + PHY_PTR1);
	writel(0x00083DEF, phy_base + PHY_PTR2);
	writel(ddrphy_ptr3[freq_e], phy_base + PHY_PTR3);
	writel(ddrphy_ptr4[freq_e], phy_base + PHY_PTR4);
	writel(0xF004001A, phy_base + PHY_DSGCR);

	/* change the value of the on-die pull-up/pull-down registors */
	tmp = readl(phy_base + PHY_DXCCR);
	tmp &= ~0x0ee0;
	tmp |= PHY_DXCCR_DQSNRES_688_OHM | PHY_DXCCR_DQSRES_688_OHM;
	writel(tmp, phy_base + PHY_DXCCR);

	writel(0x0000040B, phy_base + PHY_DCR);
	writel(ddrphy_dtpr0[freq_e], phy_base + PHY_DTPR0);
	writel(ddrphy_dtpr1[freq_e], phy_base + PHY_DTPR1);
	writel(ddrphy_dtpr2[freq_e], phy_base + PHY_DTPR2);
	writel(ddrphy_mr0[freq_e], phy_base + PHY_MR0);
	writel(0x00000006, phy_base + PHY_MR1);
	writel(ddrphy_mr2[freq_e], phy_base + PHY_MR2);
	writel(ddr3plus ? 0x00000800 : 0x00000000, phy_base + PHY_MR3);

	while (!(readl(phy_base + PHY_PGSR0) & PHY_PGSR0_IDONE))
		;

	writel(0x0300C473, phy_base + PHY_PGCR1);
	writel(0x0000005D, phy_base + PHY_ZQ_BASE + PHY_ZQ_CR1);

	return 0;
}