[people/ms/u-boot.git] / arch / arm / mach-uniphier / mmc-boot-mode.c

/*
 * Copyright (C) 2016 Socionext Inc.
 *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <mmc.h>
#include <spl.h>

u32 spl_boot_mode(const u32 boot_device)
{
	struct mmc *mmc;

	/*
	 * work around a bug in the Boot ROM of LD4, Pro4, and sLD8:
	 *
	 * The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of
	 * Extended CSD register; when switching to the Boot Partition 1, the
	 * Boot ROM should issue the SWITCH command (CMD6) with Set Bits for
	 * the Access Bits, but in fact it uses Write Byte for the Access Bits.
	 * As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG
	 * is lost.  This bug was fixed for PH1-Pro5 and later SoCs.
	 *
	 * Fixup mmc->part_config here because it is used to determine the
	 * partition which the U-Boot image is read from.
	 */
	mmc = find_mmc_device(0);
	mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK);
	mmc->part_config |= EXT_CSD_BOOT_PARTITION_ENABLE;

	return MMCSD_MODE_EMMCBOOT;
}
Commit	Line	Data
81c847bf MY	1	/*
	2	* Copyright (C) 2016 Socionext Inc.
	3	* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7
	8	#include <common.h>
	9	#include <mmc.h>
	10	#include <spl.h>
	11
	12	u32 spl_boot_mode(const u32 boot_device)
	13	{
	14	struct mmc *mmc;
	15
	16	/*
00aa453e	17	* work around a bug in the Boot ROM of LD4, Pro4, and sLD8:
81c847bf MY	18	*
	19	* The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of
	20	* Extended CSD register; when switching to the Boot Partition 1, the
	21	* Boot ROM should issue the SWITCH command (CMD6) with Set Bits for
	22	* the Access Bits, but in fact it uses Write Byte for the Access Bits.
	23	* As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG
	24	* is lost. This bug was fixed for PH1-Pro5 and later SoCs.
	25	*
	26	* Fixup mmc->part_config here because it is used to determine the
	27	* partition which the U-Boot image is read from.
	28	*/
	29	mmc = find_mmc_device(0);
	30	mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK);
	31	mmc->part_config \|= EXT_CSD_BOOT_PARTITION_ENABLE;
	32
	33	return MMCSD_MODE_EMMCBOOT;
	34	}