spl: spi: Move the generic SPI loader into common/spl

All the other SPL loaders are in this directory, so move the SPI one in
there too.

There are two board-specific SPI loaders (fsl and sunxi). These remain in
the drivers/mtd/spi directory, since they do not contain generic code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

common/spl/Makefile

@@ -25,4 +25,5 @@ obj-$(CONFIG_SPL_FAT_SUPPORT) += spl_fat.o
 obj-$(CONFIG_SPL_EXT_SUPPORT) += spl_ext.o
 obj-$(CONFIG_SPL_SATA_SUPPORT) += spl_sata.o
 obj-$(CONFIG_SPL_DFU_SUPPORT) += spl_dfu.o
+obj-$(CONFIG_SPL_SPI_LOAD) += spl_spi.o
 endif

common/spl/spl_spi.c

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2011 OMICRON electronics GmbH
+ *
+ * based on drivers/mtd/nand/nand_spl_load.c
+ *
+ * Copyright (C) 2011
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <errno.h>
+#include <spl.h>
+
+#ifdef CONFIG_SPL_OS_BOOT
+/*
+ * Load the kernel, check for a valid header we can parse, and if found load
+ * the kernel and then device tree.
+ */
+static int spi_load_image_os(struct spi_flash *flash,
+			     struct image_header *header)
+{
+	int err;
+
+	/* Read for a header, parse or error out. */
+	spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
+		       (void *)header);
+
+	if (image_get_magic(header) != IH_MAGIC)
+		return -1;
+
+	err = spl_parse_image_header(&spl_image, header);
+	if (err)
+		return err;
+
+	spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
+		       spl_image.size, (void *)spl_image.load_addr);
+
+	/* Read device tree. */
+	spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
+		       CONFIG_SYS_SPI_ARGS_SIZE,
+		       (void *)CONFIG_SYS_SPL_ARGS_ADDR);
+
+	return 0;
+}
+#endif
+
+static ulong spl_spi_fit_read(struct spl_load_info *load, ulong sector,
+			      ulong count, void *buf)
+{
+	struct spi_flash *flash = load->dev;
+	ulong ret;
+
+	ret = spi_flash_read(flash, sector, count, buf);
+	if (!ret)
+		return count;
+	else
+		return 0;
+}
+/*
+ * The main entry for SPI booting. It's necessary that SDRAM is already
+ * configured and available since this code loads the main U-Boot image
+ * from SPI into SDRAM and starts it from there.
+ */
+int spl_spi_load_image(struct spl_boot_device *bootdev)
+{
+	int err = 0;
+	struct spi_flash *flash;
+	struct image_header *header;
+
+	/*
+	 * Load U-Boot image from SPI flash into RAM
+	 */
+
+	flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
+				CONFIG_SF_DEFAULT_CS,
+				CONFIG_SF_DEFAULT_SPEED,
+				CONFIG_SF_DEFAULT_MODE);
+	if (!flash) {
+		puts("SPI probe failed.\n");
+		return -ENODEV;
+	}
+
+	/* use CONFIG_SYS_TEXT_BASE as temporary storage area */
+	header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
+
+#ifdef CONFIG_SPL_OS_BOOT
+	if (spl_start_uboot() || spi_load_image_os(flash, header))
+#endif
+	{
+		/* Load u-boot, mkimage header is 64 bytes. */
+		err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
+				     (void *)header);
+		if (err)
+			return err;
+
+		if (IS_ENABLED(CONFIG_SPL_LOAD_FIT)) {
+			struct spl_load_info load;
+
+			debug("Found FIT\n");
+			load.dev = flash;
+			load.priv = NULL;
+			load.filename = NULL;
+			load.bl_len = 1;
+			load.read = spl_spi_fit_read;
+			err = spl_load_simple_fit(&load,
+						  CONFIG_SYS_SPI_U_BOOT_OFFS,
+						  header);
+		} else {
+			err = spl_parse_image_header(&spl_image, header);
+			if (err)
+				return err;
+			err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
+					     spl_image.size,
+					     (void *)spl_image.load_addr);
+		}
+	}
+
+	return err;
+}