mpc83xx: Add NAND boot support for MPC8315E-RDB boards

The core support for NAND booting is there already, so this patch
is pretty straightforward.

There is one trick though: top level Makefile expects nand_spl to
be in nand_spl/board/$(BOARDDIR), but we can fully reuse the code
from mpc8313erdb boards, and so to not duplicate the code we just
symlink nand_spl/board/freescale/mpc8315erdb to mpc8313erdb.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>

o silence make during ln echo
o update documentation
o and avoid:

$ ./MAKEALL MPC8315ERDB_NAND
Configuring for MPC8315ERDB board...
sdram.o: In function `fixed_sdram':
/home/r1aaha/git/u-boot/nand_spl/board/freescale/mpc8313erdb/sdram.c:72: undefined reference to `udelay'

by renaming udelay -> __udelay in the spirit of commit
3eb90bad651fab39cffba750ec4421a9c01d60e7 "Generic udelay() with watchdog
support".

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

7 files changed, 167 insertions, 23 deletions

diff --git a/MAKEALL b/MAKEALL
index ab1bb6f..1b78778 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -362,6 +362,7 @@ LIST_83xx="		\
 	MPC8313ERDB_33	\
 	MPC8313ERDB_NAND_66	\
 	MPC8315ERDB	\
+	MPC8315ERDB_NAND	\
 	MPC8323ERDB	\
 	MPC832XEMDS	\
 	MPC832XEMDS_ATM	\
diff --git a/Makefile b/Makefile
index ed6156f..7dca112 100644
--- a/Makefile
+++ b/Makefile
@@ -2261,8 +2261,12 @@ MPC8313ERDB_NAND_66_config: unconfig
 		echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk ; \
 	fi ;
 
+MPC8315ERDB_NAND_config \
 MPC8315ERDB_config: unconfig
-	@$(MKCONFIG) -a MPC8315ERDB ppc mpc83xx mpc8315erdb freescale
+	@if [ "$(findstring _NAND_,$@)" ] ; then \
+		ln -sf mpc8313erdb nand_spl/board/freescale/mpc8315erdb ; \
+	fi ;
+	@$(MKCONFIG) -t $(@:_config=) MPC8315ERDB ppc mpc83xx mpc8315erdb freescale
 
 MPC8323ERDB_config:	unconfig
 	@$(MKCONFIG) -a MPC8323ERDB ppc mpc83xx mpc8323erdb freescale
diff --git a/board/freescale/mpc8315erdb/config.mk b/board/freescale/mpc8315erdb/config.mk
index f768264..bf972fb 100644
--- a/board/freescale/mpc8315erdb/config.mk
+++ b/board/freescale/mpc8315erdb/config.mk
@@ -1 +1,9 @@
+ifndef NAND_SPL
+ifeq ($(CONFIG_MK_NAND), y)
+TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
+endif
+endif
+
+ifndef TEXT_BASE
 TEXT_BASE = 0xFE000000
+endif
diff --git a/board/freescale/mpc8315erdb/mpc8315erdb.c b/board/freescale/mpc8315erdb/mpc8315erdb.c
index dea4d6f..d5e71dc 100644
--- a/board/freescale/mpc8315erdb/mpc8315erdb.c
+++ b/board/freescale/mpc8315erdb/mpc8315erdb.c
@@ -32,6 +32,8 @@
 #include <mpc83xx.h>
 #include <netdev.h>
 #include <asm/io.h>
+#include <ns16550.h>
+#include <nand.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -45,6 +47,8 @@ int board_early_init_f(void)
 	return 0;
 }
 
+#ifndef CONFIG_NAND_SPL
+
 static u8 read_board_info(void)
 {
 	u8 val8;
@@ -220,3 +224,41 @@ int board_eth_init(bd_t *bis)
 	cpu_eth_init(bis);	/* Initialize TSECs first */
 	return pci_eth_init(bis);
 }
+
+#else /* CONFIG_NAND_SPL */
+
+int checkboard(void)
+{
+	puts("Board: Freescale MPC8315ERDB\n");
+	return 0;
+}
+
+void board_init_f(ulong bootflag)
+{
+	board_early_init_f();
+	NS16550_init((NS16550_t)(CONFIG_SYS_IMMR + 0x4500),
+		     CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);
+	puts("NAND boot... ");
+	init_timebase();
+	initdram(0);
+	relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC + 0x10000, (gd_t *)gd,
+		      CONFIG_SYS_NAND_U_BOOT_RELOC);
+}
+
+void board_init_r(gd_t *gd, ulong dest_addr)
+{
+	nand_boot();
+}
+
+void putc(char c)
+{
+	if (gd->flags & GD_FLG_SILENT)
+		return;
+
+	if (c == '\n')
+		NS16550_putc((NS16550_t)(CONFIG_SYS_IMMR + 0x4500), '\r');
+
+	NS16550_putc((NS16550_t)(CONFIG_SYS_IMMR + 0x4500), c);
+}
+
+#endif /* CONFIG_NAND_SPL */
diff --git a/board/freescale/mpc8315erdb/sdram.c b/board/freescale/mpc8315erdb/sdram.c
index ead7b1e..fe8ec1e 100644
--- a/board/freescale/mpc8315erdb/sdram.c
+++ b/board/freescale/mpc8315erdb/sdram.c
@@ -54,6 +54,7 @@ static void resume_from_sleep(void)
  * This is useful for faster booting in configs where the RAM is unlikely
  * to be changed, or for things like NAND booting where space is tight.
  */
+#ifndef CONFIG_SYS_RAMBOOT
 static long fixed_sdram(void)
 {
 	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
@@ -68,7 +69,7 @@ static long fixed_sdram(void)
 	 * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
 	 * or the DDR2 controller may fail to initialize correctly.
 	 */
-	udelay(50000);
+	__udelay(50000);
 
 	im->ddr.csbnds[0].csbnds = (msize - 1) >> 24;
 	im->ddr.cs_config[0] = CONFIG_SYS_DDR_CS0_CONFIG;
@@ -100,6 +101,12 @@ static long fixed_sdram(void)
 
 	return msize;
 }
+#else
+static long fixed_sdram(void)
+{
+	return CONFIG_SYS_DDR_SIZE * 1024 * 1024;
+}
+#endif /* CONFIG_SYS_RAMBOOT */
 
 phys_size_t initdram(int board_type)
 {
diff --git a/doc/README.mpc8315erdb b/doc/README.mpc8315erdb
index 7d476d0..b32132d 100644
--- a/doc/README.mpc8315erdb
+++ b/doc/README.mpc8315erdb
@@ -15,6 +15,18 @@ Freescale MPC8315ERDB Board
 	  4321		  4321
 	(where the '*' indicates the position of the tab of the switch.)
 
+	To boot the image at the beginning of NAND flash, use these
+	DIP switch settings for S3 S4:
+
+	+------+	+------+
+	| *    |	|  *** |
+	|  *** |	| *    |
+	+------+ ON	+------+ ON
+	  4321		  4321
+	(where the '*' indicates the position of the tab of the switch.)
+
+	When booting from NAND, use u-boot-nand.bin, not u-boot.bin.
+
 2.	Memory Map
 	The memory map looks like this:
 
@@ -26,6 +38,9 @@ Freescale MPC8315ERDB Board
 	0xe060_0000	0xe060_7fff	NAND FLASH (CS1) 32K
 	0xfe00_0000	0xfe7f_ffff	NOR FLASH (CS0)	 8M
 
+	When booting from NAND, NAND flash is CS0 and NOR flash
+	is CS1.
+
 3.	Definitions
 
 3.1	Explanation of NEW definitions in:
@@ -43,13 +58,15 @@ Freescale MPC8315ERDB Board
 
 	export CROSS_COMPILE=your-cross-compiler-prefix-
 	make distclean
-	make MPC8315ERDB_config
+	make MPC8315ERDB_config (or MPC8315ERDB_NAND_config for u-boot-nand.bin)
 	make all
 
 5.	Downloading and Flashing Images
 
 5.1	Reflash U-boot Image using U-boot
 
+	NOR flash:
+
 	tftp 40000 u-boot.bin
 	protect off all
 	erase fe000000 fe1fffff
@@ -60,6 +77,15 @@ Freescale MPC8315ERDB Board
 	You have to supply the correct byte count with 'xxxx'
 	from the TFTP result log.
 
+	NAND flash:
+
+	=>tftpboot $loadaddr <filename>
+	=>nand erase 0 0x80000
+	=>nand write $loadaddr 0 0x80000
+
+	...where 0x80000 is the filesize rounded up to
+	the next 0x20000 increment.
+
 5.2	Downloading and Booting Linux Kernel
 
 	Ensure that all networking-related environment variables are set
@@ -76,5 +102,4 @@ Freescale MPC8315ERDB Board
 
 6	Notes
 
-	Booting from NAND flash is not yet supported.
 	The console baudrate for MPC8315ERDB is 115200bps.
diff --git a/include/configs/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index 79376b3..cfed4ca 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -25,6 +25,11 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#ifdef CONFIG_MK_NAND
+#define CONFIG_NAND_U_BOOT		1
+#define CONFIG_RAMBOOT_TEXT_BASE	0x00100000
+#endif
+
 /*
  * High Level Configuration Options
  */
@@ -51,20 +56,29 @@
 	HRCWL_SVCOD_DIV_2 |\
 	HRCWL_CSB_TO_CLKIN_2X1 |\
 	HRCWL_CORE_TO_CSB_3X1)
-#define CONFIG_SYS_HRCW_HIGH (\
+#define CONFIG_SYS_HRCW_HIGH_BASE (\
 	HRCWH_PCI_HOST |\
 	HRCWH_PCI1_ARBITER_ENABLE |\
 	HRCWH_CORE_ENABLE |\
-	HRCWH_FROM_0X00000100 |\
 	HRCWH_BOOTSEQ_DISABLE |\
 	HRCWH_SW_WATCHDOG_DISABLE |\
-	HRCWH_ROM_LOC_LOCAL_16BIT |\
-	HRCWH_RL_EXT_LEGACY |\
 	HRCWH_TSEC1M_IN_RGMII |\
 	HRCWH_TSEC2M_IN_RGMII |\
 	HRCWH_BIG_ENDIAN |\
 	HRCWH_LALE_NORMAL)
 
+#ifdef CONFIG_NAND_SPL
+#define CONFIG_SYS_HRCW_HIGH (CONFIG_SYS_HRCW_HIGH_BASE |\
+		       HRCWH_FROM_0XFFF00100 |\
+		       HRCWH_ROM_LOC_NAND_SP_8BIT |\
+		       HRCWH_RL_EXT_NAND)
+#else
+#define CONFIG_SYS_HRCW_HIGH (CONFIG_SYS_HRCW_HIGH_BASE |\
+		       HRCWH_FROM_0X00000100 |\
+		       HRCWH_ROM_LOC_LOCAL_16BIT |\
+		       HRCWH_RL_EXT_LEGACY)
+#endif
+
 /*
  * System IO Config
  */
@@ -79,6 +93,10 @@
  */
 #define CONFIG_SYS_IMMR		0xE0000000
 
+#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+#define CONFIG_DEFAULT_IMMR	CONFIG_SYS_IMMR
+#endif
+
 /*
  * Arbiter Setup
  */
@@ -161,12 +179,6 @@
  */
 #define CONFIG_SYS_MONITOR_BASE	TEXT_BASE /* start of monitor */
 
-#if (CONFIG_SYS_MONITOR_BASE < CONFIG_SYS_FLASH_BASE)
-#define CONFIG_SYS_RAMBOOT
-#else
-#undef CONFIG_SYS_RAMBOOT
-#endif
-
 #define CONFIG_SYS_MONITOR_LEN		(384 * 1024) /* Reserve 384 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN		(512 * 1024) /* Reserved for malloc */
 
@@ -200,10 +212,10 @@
 #define CONFIG_SYS_LBLAWBAR0_PRELIM	CONFIG_SYS_FLASH_BASE /* Window base at flash base */
 #define CONFIG_SYS_LBLAWAR0_PRELIM	0x80000016 /* 8MB window size */
 
-#define CONFIG_SYS_BR0_PRELIM		( CONFIG_SYS_FLASH_BASE	/* Flash Base address */ \
+#define CONFIG_SYS_NOR_BR_PRELIM	(CONFIG_SYS_FLASH_BASE \
 				| (2 << BR_PS_SHIFT)	/* 16 bit port size */ \
 				| BR_V )		/* valid */
-#define CONFIG_SYS_OR0_PRELIM		( (~(CONFIG_SYS_FLASH_SIZE - 1) << 20) \
+#define CONFIG_SYS_NOR_OR_PRELIM	((~(CONFIG_SYS_FLASH_SIZE - 1) << 20) \
 				| OR_UPM_XAM \
 				| OR_GPCM_CSNT \
 				| OR_GPCM_ACS_DIV2 \
@@ -223,18 +235,31 @@
 /*
  * NAND Flash on the Local Bus
  */
-#define CONFIG_SYS_NAND_BASE		0xE0600000	/* 0xE0600000 */
+
+#ifdef CONFIG_NAND_SPL
+#define CONFIG_SYS_NAND_BASE		0xFFF00000
+#else
+#define CONFIG_SYS_NAND_BASE		0xE0600000
+#endif
+
 #define CONFIG_SYS_MAX_NAND_DEVICE	1
 #define CONFIG_MTD_NAND_VERIFY_WRITE	1
 #define CONFIG_CMD_NAND			1
 #define CONFIG_NAND_FSL_ELBC		1
+#define CONFIG_SYS_NAND_BLOCK_SIZE 16384
+
+#define CONFIG_SYS_NAND_U_BOOT_SIZE  (512 << 10)
+#define CONFIG_SYS_NAND_U_BOOT_DST   0x00100000
+#define CONFIG_SYS_NAND_U_BOOT_START 0x00100100
+#define CONFIG_SYS_NAND_U_BOOT_OFFS  16384
+#define CONFIG_SYS_NAND_U_BOOT_RELOC 0x00010000
 
-#define CONFIG_SYS_BR1_PRELIM	( CONFIG_SYS_NAND_BASE \
+#define CONFIG_SYS_NAND_BR_PRELIM	(CONFIG_SYS_NAND_BASE \
 				| (2<<BR_DECC_SHIFT)	/* Use HW ECC */ \
 				| BR_PS_8		/* Port Size = 8 bit */ \
 				| BR_MS_FCM		/* MSEL = FCM */ \
 				| BR_V )		/* valid */
-#define CONFIG_SYS_OR1_PRELIM	( 0xFFFF8000		/* length 32K */ \
+#define CONFIG_SYS_NAND_OR_PRELIM	(0xFFFF8000	/* length 32K */ \
 				| OR_FCM_CSCT \
 				| OR_FCM_CST \
 				| OR_FCM_CHT \
@@ -243,9 +268,31 @@
 				| OR_FCM_EHTR )
 				/* 0xFFFF8396 */
 
+#ifdef CONFIG_NAND_U_BOOT
+#define CONFIG_SYS_BR0_PRELIM CONFIG_SYS_NAND_BR_PRELIM
+#define CONFIG_SYS_OR0_PRELIM CONFIG_SYS_NAND_OR_PRELIM
+#define CONFIG_SYS_BR1_PRELIM CONFIG_SYS_NOR_BR_PRELIM
+#define CONFIG_SYS_OR1_PRELIM CONFIG_SYS_NOR_OR_PRELIM
+#else
+#define CONFIG_SYS_BR0_PRELIM CONFIG_SYS_NOR_BR_PRELIM
+#define CONFIG_SYS_OR0_PRELIM CONFIG_SYS_NOR_OR_PRELIM
+#define CONFIG_SYS_BR1_PRELIM CONFIG_SYS_NAND_BR_PRELIM
+#define CONFIG_SYS_OR1_PRELIM CONFIG_SYS_NAND_OR_PRELIM
+#endif
+
 #define CONFIG_SYS_LBLAWBAR1_PRELIM	CONFIG_SYS_NAND_BASE
 #define CONFIG_SYS_LBLAWAR1_PRELIM	0x8000000E	/* 32KB  */
 
+#define CONFIG_SYS_NAND_LBLAWBAR_PRELIM CONFIG_SYS_LBLAWBAR1_PRELIM
+#define CONFIG_SYS_NAND_LBLAWAR_PRELIM CONFIG_SYS_LBLAWAR1_PRELIM
+
+#if CONFIG_SYS_MONITOR_BASE < CONFIG_SYS_FLASH_BASE && \
+	!defined(CONFIG_NAND_SPL)
+#define CONFIG_SYS_RAMBOOT
+#else
+#undef CONFIG_SYS_RAMBOOT
+#endif
+
 /*
  * Serial Port
  */
@@ -254,7 +301,7 @@
 #define CONFIG_SYS_NS16550
 #define CONFIG_SYS_NS16550_SERIAL
 #define CONFIG_SYS_NS16550_REG_SIZE	1
-#define CONFIG_SYS_NS16550_CLK		get_bus_freq(0)
+#define CONFIG_SYS_NS16550_CLK		(CONFIG_83XX_CLKIN * 2)
 
 #define CONFIG_SYS_BAUDRATE_TABLE  \
 	{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200}
@@ -408,7 +455,16 @@
 /*
  * Environment
  */
-#ifndef CONFIG_SYS_RAMBOOT
+#if defined(CONFIG_NAND_U_BOOT)
+	#define CONFIG_ENV_IS_IN_NAND	1
+	#define CONFIG_ENV_OFFSET		(512 * 1024)
+	#define CONFIG_ENV_SECT_SIZE	CONFIG_SYS_NAND_BLOCK_SIZE
+	#define CONFIG_ENV_SIZE		CONFIG_ENV_SECT_SIZE
+	#define CONFIG_ENV_SIZE_REDUND	CONFIG_ENV_SIZE
+	#define CONFIG_ENV_RANGE	(CONFIG_ENV_SECT_SIZE * 4)
+	#define CONFIG_ENV_OFFSET_REDUND	(CONFIG_ENV_OFFSET + \
+						 CONFIG_ENV_RANGE)
+#elif !defined(CONFIG_SYS_RAMBOOT)
 	#define CONFIG_ENV_IS_IN_FLASH	1
 	#define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
 	#define CONFIG_ENV_SECT_SIZE	0x10000 /* 64K(one sector) for env */
@@ -442,7 +498,7 @@
 #define CONFIG_CMD_DATE
 #define CONFIG_CMD_PCI
 
-#if defined(CONFIG_SYS_RAMBOOT)
+#if defined(CONFIG_SYS_RAMBOOT) && !defined(CONFIG_NAND_U_BOOT)
     #undef CONFIG_CMD_SAVEENV
     #undef CONFIG_CMD_LOADS
 #endif
@@ -504,7 +560,8 @@
 
 /* FLASH: icache cacheable, but dcache-inhibit and guarded */
 #define CONFIG_SYS_IBAT2L	(CONFIG_SYS_FLASH_BASE | BATL_PP_10 | BATL_MEMCOHERENCE)
-#define CONFIG_SYS_IBAT2U	(CONFIG_SYS_FLASH_BASE | BATU_BL_8M | BATU_VS | BATU_VP)
+#define CONFIG_SYS_IBAT2U	(CONFIG_SYS_FLASH_BASE | BATU_BL_32M | \
+				 BATU_VS | BATU_VP)
 #define CONFIG_SYS_DBAT2L	(CONFIG_SYS_FLASH_BASE | BATL_PP_10 | \
 			BATL_CACHEINHIBIT | BATL_GUARDEDSTORAGE)
 #define CONFIG_SYS_DBAT2U	CONFIG_SYS_IBAT2U