From e17398316e82d8b28217232b4fd6030c65138e74 Mon Sep 17 00:00:00 2001
From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Date: Mon, 12 Aug 2013 01:18:00 +0200
Subject: MIPS: lantiq: add NAND SPL support

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

--- a/arch/mips/cpu/mips32/lantiq-common/spl.c
+++ b/arch/mips/cpu/mips32/lantiq-common/spl.c
@@ -8,6 +8,7 @@
 #include <image.h>
 #include <version.h>
 #include <spi_flash.h>
+#include <nand.h>
 #include <linux/compiler.h>
 #include <lzma/LzmaDec.h>
 #include <linux/lzo.h>
@@ -63,6 +64,18 @@
 #define spl_boot_nor_flash	0
 #endif
 
+#if defined(CONFIG_LTQ_SUPPORT_SPL_NAND_FLASH) && defined(CONFIG_SYS_BOOT_NANDSPL)
+#define spl_boot_nand_flash	1
+#else
+#define spl_boot_nand_flash	0
+#ifndef CONFIG_SYS_NAND_U_BOOT_OFFS
+#define CONFIG_SYS_NAND_U_BOOT_OFFS	0
+#endif
+#ifndef CONFIG_SYS_NAND_PAGE_SIZE
+#define CONFIG_SYS_NAND_PAGE_SIZE	0
+#endif
+#endif
+
 #define spl_sync()	__asm__ __volatile__("sync");
 
 struct spl_image {
@@ -337,6 +350,58 @@ static int spl_load_nor_flash(struct spl
 	return ret;
 }
 
+static int spl_load_nand_flash(struct spl_image *spl)
+{
+	image_header_t *hdr;
+	int ret;
+	unsigned long loadaddr;
+
+	/*
+	 * Image format:
+	 *
+	 * - 12 byte non-volatile bootstrap header
+	 * - SPL binary
+	 * - 12 byte non-volatile bootstrap header
+	 * - padding bytes up to CONFIG_SYS_NAND_U_BOOT_OFFS
+	 * - 64 byte U-Boot mkimage header
+	 * - U-Boot binary
+	 */
+	spl->data_addr = CONFIG_SYS_NAND_U_BOOT_OFFS;
+
+	spl_puts("SPL: initializing NAND flash\n");
+	nand_init();
+
+	spl_debug("SPL: reading image header at page offset %lx\n",
+		  spl->data_addr);
+
+	hdr = (image_header_t *) CONFIG_LOADADDR;
+	ret = nand_spl_load_image(spl->data_addr,
+				  CONFIG_SYS_NAND_PAGE_SIZE, hdr);
+	if (ret)
+		return ret;
+
+	spl_debug("SPL: checking image header at address %p\n", hdr);
+
+	ret = spl_parse_image(hdr, spl);
+	if (ret)
+		return ret;
+
+	if (spl_is_compressed(spl))
+		loadaddr = CONFIG_LOADADDR;
+	else
+		loadaddr = spl->entry_addr;
+
+	spl_puts("SPL: loading U-Boot to RAM\n");
+
+	ret = nand_spl_load_image(spl->data_addr, spl->data_size,
+				  (void *) loadaddr);
+
+	if (spl_is_compressed(spl))
+		ret = spl_uncompress(spl, loadaddr);
+
+	return ret;
+}
+
 static int spl_load(struct spl_image *spl)
 {
 	int ret;
@@ -345,6 +410,8 @@ static int spl_load(struct spl_image *sp
 		ret = spl_load_spi_flash(spl);
 	else if (spl_boot_nor_flash)
 		ret = spl_load_nor_flash(spl);
+	else if (spl_boot_nand_flash)
+		ret = spl_load_nand_flash(spl);
 	else
 		ret = 1;
 
--- a/arch/mips/include/asm/lantiq/config.h
+++ b/arch/mips/include/asm/lantiq/config.h
@@ -40,6 +40,26 @@
 #define CONFIG_SPI_SPL_SIMPLE
 #endif
 
+/*
+ * NAND flash SPL
+ * BOOT CFG 06 only (address cycle based probing, 2KB or 512B page size)
+ */
+#if defined(CONFIG_LTQ_SUPPORT_SPL_NAND_FLASH) && defined(CONFIG_SYS_BOOT_NANDSPL)
+#define CONFIG_SPL
+#define CONFIG_SPL_NAND_SUPPORT
+#define CONFIG_SPL_NAND_DRIVERS
+#define CONFIG_SPL_NAND_SIMPLE
+#define CONFIG_SPL_NAND_ECC
+
+/* use software ECC until driver supports HW ECC */
+#define CONFIG_SPL_NAND_SOFTECC
+#define CONFIG_SYS_NAND_ECCSIZE		256
+#define CONFIG_SYS_NAND_ECCBYTES	3
+#define CONFIG_SYS_NAND_ECCPOS		{40, 41, 42, 43, 44, 45, 46, 47, \
+					48, 49, 50, 51, 52, 53, 54, 55, \
+					56, 57, 58, 59, 60, 61, 62, 63}
+#endif
+
 #if defined(CONFIG_LTQ_SUPPORT_SPL_NOR_FLASH) && defined(CONFIG_SYS_BOOT_NORSPL)
 #define CONFIG_SPL
 #endif
@@ -148,6 +168,21 @@
 #define CONFIG_ENV_LOAD_UBOOT_SF
 #endif
 
+#if defined(CONFIG_LTQ_SUPPORT_NAND_FLASH)
+#define CONFIG_ENV_WRITE_UBOOT_NAND				\
+	"write-uboot-nand="					\
+	"nand erase 0 $filesize && "				\
+	"nand write $fileaddr 0 $filesize\0"
+
+#define CONFIG_ENV_LOAD_UBOOT_NAND						\
+	"load-uboot-nandspl=tftpboot u-boot.ltq.nandspl\0"			\
+	"load-uboot-nandspl-lzo=tftpboot u-boot.ltq.lzo.nandspl\0"		\
+	"load-uboot-nandspl-lzma=tftpboot u-boot.ltq.lzma.nandspl\0"
+#else
+#define CONFIG_ENV_WRITE_UBOOT_NAND
+#define CONFIG_ENV_LOAD_UBOOT_NAND
+#endif
+
 #define CONFIG_ENV_LANTIQ_DEFAULTS	\
 	CONFIG_ENV_CONSOLEDEV		\
 	CONFIG_ENV_ADDCONSOLE		\
@@ -159,6 +194,8 @@
 	CONFIG_ENV_LOAD_UBOOT_NOR	\
 	CONFIG_ENV_SF_PROBE		\
 	CONFIG_ENV_WRITE_UBOOT_SF	\
-	CONFIG_ENV_LOAD_UBOOT_SF
+	CONFIG_ENV_LOAD_UBOOT_SF	\
+	CONFIG_ENV_WRITE_UBOOT_NAND	\
+	CONFIG_ENV_LOAD_UBOOT_NAND
 
 #endif /* __LANTIQ_CONFIG_H__ */