ARCH: SPL: Add parametric board initializer

Add a structure for table-driven configuration mechanism such that no recompilation
is needed to update the configuration parameters, rather than hard-coding
board initialization parameters.

Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/include/asm/arch-exynos/spl.h

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ASM_ARCH_EXYNOS_SPL_H__
+#define __ASM_ARCH_EXYNOS_SPL_H__
+
+#include <asm/arch-exynos/dmc.h>
+
+enum boot_mode {
+	/*
+	 * Assign the OM pin values for respective boot modes.
+	 * Exynos4 does not support spi boot and the mmc boot OM
+	 * pin values are the same across Exynos4 and Exynos5.
+	 */
+	BOOT_MODE_MMC = 4,
+	BOOT_MODE_SERIAL = 20,
+	/* Boot based on Operating Mode pin settings */
+	BOOT_MODE_OM = 32,
+	BOOT_MODE_USB,	/* Boot using USB download */
+};
+
+#ifndef __ASSEMBLY__
+/* Parameters of early board initialization in SPL */
+struct spl_machine_param {
+	/* Add fields as and when required */
+	u32		signature;
+	u32		version;	/* Version number */
+	u32		size;		/* Size of block */
+	/**
+	 * Parameters we expect, in order, terminated with \0. Each parameter
+	 * is a single character representing one 32-bit word in this
+	 * structure.
+	 *
+	 * Valid characters in this string are:
+	 *
+	 * Code		Name
+	 * v		mem_iv_size
+	 * m		mem_type
+	 * u		uboot_size
+	 * b		boot_source
+	 * f		frequency_mhz (memory frequency in MHz)
+	 * a		ARM clock frequency in MHz
+	 * s		serial base address
+	 * i		i2c base address for early access (meant for PMIC)
+	 * r		board rev GPIO numbers used to read board revision
+	 *			(lower halfword=bit 0, upper=bit 1)
+	 * M		Memory Manufacturer name
+	 * \0		termination
+	 */
+	char		params[12];	/* Length must be word-aligned */
+	u32		mem_iv_size;	/* Memory channel interleaving size */
+	enum ddr_mode	mem_type;	/* Type of on-board memory */
+	/*
+	 * U-boot size - The iROM mmc copy function used by the SPL takes a
+	 * block count paramter to describe the u-boot size unlike the spi
+	 * boot copy function which just uses the u-boot size directly. Align
+	 * the u-boot size to block size (512 bytes) when populating the SPL
+	 * table only for mmc boot.
+	 */
+	u32		uboot_size;
+	enum boot_mode	boot_source;	/* Boot device */
+	enum mem_manuf	mem_manuf;	/* Memory Manufacturer */
+	unsigned	frequency_mhz;	/* Frequency of memory in MHz */
+	unsigned	arm_freq_mhz;	/* ARM Frequency in MHz */
+	u32		serial_base;	/* Serial base address */
+	u32		i2c_base;	/* i2c base address */
+} __attribute__((__packed__));
+#endif
+
+/**
+ * Validate signature and return a pointer to the parameter table.  If the
+ * signature is invalid, call panic() and never return.
+ *
+ * @return pointer to the parameter table if signature matched or never return.
+ */
+struct spl_machine_param *spl_get_machine_params(void);
+
+#endif /* __ASM_ARCH_EXYNOS_SPL_H__ */