SPL: ARM: spear: Add SPL support for SPEAr600 platform

This patch adds SPL support for SPEAr600. Currently only SNOR
(Serial NOR) flash support is included. Other boot devices
(NAND, MMC, USB ...) may be added with later patches.

Tested on the STM SPEAr600 evaluation and x600 SPEAr600 boards.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Amit Virdi <amit.virdi@st.com>
Cc: Vipin Kumar <vipin.kumar@st.com>

1 files changed, 197 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm926ejs/spear/spl_boot.c b/arch/arm/cpu/arm926ejs/spear/spl_boot.c
new file mode 100644
index 0000000..f2f9a49
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/spear/spl_boot.c
@@ -0,0 +1,197 @@
+/*
+ * (C) Copyright 2000-2009
+ * Vipin Kumar, ST Microelectronics, vipin.kumar@st.com
+ *
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <image.h>
+#include <linux/compiler.h>
+#include <asm/io.h>
+#include <asm/arch/spr_defs.h>
+#include <linux/mtd/st_smi.h>
+
+static const char kernel_name[] = "Linux";
+static const char loader_name[] = "U-Boot";
+
+int image_check_header(image_header_t *hdr, const char *name)
+{
+	if (image_check_magic(hdr) &&
+	    (!strncmp(image_get_name(hdr), name, strlen(name))) &&
+	    image_check_hcrc(hdr)) {
+		return 1;
+	}
+	return 0;
+}
+
+int image_check_data(image_header_t *hdr)
+{
+	if (image_check_dcrc(hdr))
+		return 1;
+
+	return 0;
+}
+
+/*
+ * SNOR (Serial NOR flash) related functions
+ */
+void snor_init(void)
+{
+	struct smi_regs *const smicntl =
+		(struct smi_regs * const)CONFIG_SYS_SMI_BASE;
+
+	/* Setting the fast mode values. SMI working at 166/4 = 41.5 MHz */
+	writel(HOLD1 | FAST_MODE | BANK_EN | DSEL_TIME | PRESCAL4,
+	       &smicntl->smi_cr1);
+}
+
+static int snor_image_load(u8 *load_addr, void (**image_p)(void),
+			   const char *image_name)
+{
+	image_header_t *header;
+
+	/*
+	 * Since calculating the crc in the SNOR flash does not
+	 * work, we copy the image to the destination address
+	 * minus the header size. And point the header to this
+	 * new destination. This will not work for address 0
+	 * of course.
+	 */
+	header = (image_header_t *)load_addr;
+	memcpy((ulong *)(image_get_load(header) - sizeof(image_header_t)),
+	       (const ulong *)load_addr,
+	       image_get_data_size(header) + sizeof(image_header_t));
+	header = (image_header_t *)(image_get_load(header) -
+				    sizeof(image_header_t));
+
+	if (image_check_header(header, image_name)) {
+		if (image_check_data(header)) {
+			/* Jump to boot image */
+			*image_p = (void *)image_get_load(header);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static void boot_image(void (*image)(void))
+{
+	void (*funcp)(void) __noreturn = (void *)image;
+
+	(*funcp)();
+}
+
+/*
+ * spl_boot:
+ *
+ * All supported booting types of all supported SoCs are listed here.
+ * Generic readback APIs are provided for each supported booting type
+ * eg. nand_read_skip_bad
+ */
+u32 spl_boot(void)
+{
+	void (*image)(void);
+
+#ifdef CONFIG_SPEAR_USBTTY
+	plat_late_init();
+	return 1;
+#endif
+
+	/*
+	 * All the supported booting devices are listed here. Each of
+	 * the booting type supported by the platform would define the
+	 * macro xxx_BOOT_SUPPORTED to TRUE.
+	 */
+
+	if (SNOR_BOOT_SUPPORTED && snor_boot_selected()) {
+		/* SNOR-SMI initialization */
+		snor_init();
+
+		serial_puts("Booting via SNOR\n");
+		/* Serial NOR booting */
+		if (1 == snor_image_load((u8 *)CONFIG_SYS_UBOOT_BASE,
+					    &image, loader_name)) {
+			/* Platform related late initialasations */
+			plat_late_init();
+
+			/* Jump to boot image */
+			serial_puts("Jumping to U-Boot\n");
+			boot_image(image);
+			return 1;
+		}
+	}
+
+	if (NAND_BOOT_SUPPORTED && nand_boot_selected()) {
+		/* NAND booting */
+		/* Not ported from XLoader to SPL yet */
+		return 0;
+	}
+
+	if (PNOR_BOOT_SUPPORTED && pnor_boot_selected()) {
+		/* PNOR booting */
+		/* Not ported from XLoader to SPL yet */
+		return 0;
+	}
+
+	if (MMC_BOOT_SUPPORTED && mmc_boot_selected()) {
+		/* MMC booting */
+		/* Not ported from XLoader to SPL yet */
+		return 0;
+	}
+
+	if (SPI_BOOT_SUPPORTED && spi_boot_selected()) {
+		/* SPI booting */
+		/* Not supported for any platform as of now */
+		return 0;
+	}
+
+	if (I2C_BOOT_SUPPORTED && i2c_boot_selected()) {
+		/* I2C booting */
+		/* Not supported for any platform as of now */
+		return 0;
+	}
+
+	/*
+	 * All booting types without memory are listed as below
+	 * Control has to be returned to BootROM in case of all
+	 * the following booting scenarios
+	 */
+
+	if (USB_BOOT_SUPPORTED && usb_boot_selected()) {
+		plat_late_init();
+		return 1;
+	}
+
+	if (TFTP_BOOT_SUPPORTED && tftp_boot_selected()) {
+		plat_late_init();
+		return 1;
+	}
+
+	if (UART_BOOT_SUPPORTED && uart_boot_selected()) {
+		plat_late_init();
+		return 1;
+	}
+
+	/* Ideally, the control should not reach here. */
+	hang();
+}