u-boot/board/samsung/smdkc100/onenand.c

/*
 * Copyright (C) 2008-2009 Samsung Electronics
 * Kyungmin Park <kyungmin.park@samsung.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <linux/compat.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/onenand.h>
#include <linux/mtd/samsung_onenand.h>

#include <onenand_uboot.h>

#include <asm/io.h>
#include <asm/arch/clock.h>

int onenand_board_init(struct mtd_info *mtd)
{
	struct onenand_chip *this = mtd->priv;
	struct s5pc100_clock *clk =
			(struct s5pc100_clock *)samsung_get_base_clock();
	struct samsung_onenand *onenand;
	int value;

	this->base = (void *)S5PC100_ONENAND_BASE;
	onenand = (struct samsung_onenand *)this->base;

	/* D0 Domain memory clock gating */
	value = readl(&clk->gate_d01);
	value &= ~(1 << 2);		/* CLK_ONENANDC */
	value |= (1 << 2);
	writel(value, &clk->gate_d01);

	value = readl(&clk->src0);
	value &= ~(1 << 24);		/* MUX_1nand: 0 from HCLKD0 */
	value &= ~(1 << 20);		/* MUX_HREF: 0 from FIN_27M */
	writel(value, &clk->src0);

	value = readl(&clk->div1);
	value &= ~(3 << 16);		/* PCLKD1_RATIO */
	value |= (1 << 16);
	writel(value, &clk->div1);

	writel(ONENAND_MEM_RESET_COLD, &onenand->mem_reset);

	while (!(readl(&onenand->int_err_stat) & RST_CMP))
		continue;

	writel(RST_CMP, &onenand->int_err_ack);

	/*
	 * Access_Clock [2:0]
	 * 166 MHz, 134 Mhz : 3
	 * 100 Mhz, 60 Mhz  : 2
	 */
	writel(0x3, &onenand->acc_clock);

	writel(INT_ERR_ALL, &onenand->int_err_mask);
	writel(1 << 0, &onenand->int_pin_en);	/* Enable */

	value = readl(&onenand->int_err_mask);
	value &= ~RDY_ACT;
	writel(value, &onenand->int_err_mask);

	s3c_onenand_init(mtd);

	return 0;
}