ppc4xx: Enable Primordial Stack for 40x and Unify ECC Handling

This patch (Part 2 of 2):

* Rolls up a suite of changes to enable correct primordial stack and
  global data handling when the data cache is used for such a purpose
  for PPC40x-variants (i.e. CFG_INIT_DCACHE_CS).

* Related to the first, unifies DDR2 SDRAM and ECC initialization by
  eliminating redundant ECC initialization implementations and moving
  redundant SDRAM initialization out of board code into shared 4xx
  code.

* Enables MCSR visibility on the 405EX(r).

* Enables the use of the data cache for initial RAM on
  both AMCC's Kilauea and Makalu and removes a redundant
  CFG_POST_MEMORY flag from each board's CONFIG_POST value.

  - Removed, per Stefan Roese's request, defunct memory.c file for
    Makalu and rolled sdram_init from it into makalu.c.

With respect to the 4xx DDR initialization and ECC unification, there
is certainly more work that can and should be done (file renaming,
etc.). However, that can be handled at a later date on a second or
third pass. As it stands, this patch moves things forward in an
incremental yet positive way for those platforms that utilize this
code and the features associated with it.

Signed-off-by: Grant Erickson <gerickson@nuovations.com>
Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 100 insertions, 14 deletions

diff --git a/include/configs/makalu.h b/include/configs/makalu.h
index af066f3a8a..566e611c79 100644
--- a/include/configs/makalu.h
+++ b/include/configs/makalu.h
@@ -1,4 +1,7 @@
 /*
+ * Copyright (c) 2008 Nuovation System Designs, LLC
+ *   Grant Erickson <gerickson@nuovations.com>
+ *
  * (C) Copyright 2007-2008
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
@@ -52,20 +55,56 @@
 #define CFG_MONITOR_BASE	(TEXT_BASE)
 
 /*-----------------------------------------------------------------------
- * Initial RAM & stack pointer
- *----------------------------------------------------------------------*/
-#define CFG_INIT_RAM_ADDR	0x02000000	/* inside of SDRAM	*/
-#define CFG_INIT_RAM_END	(4 << 10)
+ * Initial RAM & Stack Pointer Configuration Options
+ *
+ *   There are traditionally three options for the primordial
+ *   (i.e. initial) stack usage on the 405-series:
+ *
+ *      1) On-chip Memory (OCM) (i.e. SRAM)
+ *      2) Data cache
+ *      3) SDRAM
+ *
+ *   For the 405EX(r), there is no OCM, so we are left with (2) or (3)
+ *   the latter of which is less than desireable since it requires
+ *   setting up the SDRAM and ECC in assembly code.
+ *
+ *   To use (2), define 'CFG_INIT_DCACHE_CS' to be an unused chip
+ *   select on the External Bus Controller (EBC) and then select a
+ *   value for 'CFG_INIT_RAM_ADDR' outside of the range of valid,
+ *   physical SDRAM. Otherwise, undefine 'CFG_INIT_DCACHE_CS' and
+ *   select a value for 'CFG_INIT_RAM_ADDR' within the range of valid,
+ *   physical SDRAM to use (3).
+ *-----------------------------------------------------------------------*/
+
+#define CFG_INIT_DCACHE_CS	4
+
+#if defined(CFG_INIT_DCACHE_CS)
+#define CFG_INIT_RAM_ADDR	(CFG_SDRAM_BASE + ( 1 << 30))	/*  1 GiB */
+#else
+#define CFG_INIT_RAM_ADDR	(CFG_SDRAM_BASE + (32 << 20))	/* 32 MiB */
+#endif /* defined(CFG_INIT_DCACHE_CS) */
+
+#define CFG_INIT_RAM_END        (4 << 10)			/*  4 KiB */
 #define CFG_GBL_DATA_SIZE	256		/* num bytes initial data */
 #define CFG_GBL_DATA_OFFSET	(CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE)
-/* reserve some memory for POST and BOOT limit info */
-#define CFG_INIT_SP_OFFSET	(CFG_GBL_DATA_OFFSET - 16)
 
-/* extra data in init-ram */
-#define CFG_POST_WORD_ADDR	(CFG_GBL_DATA_OFFSET - 4)
-#define CFG_POST_MAGIC		(CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET - 8)
-#define CFG_POST_VAL		(CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET - 12)
-#define CFG_OCM_DATA_ADDR	CFG_INIT_RAM_ADDR /* for commproc.c	*/
+/*
+ * If the data cache is being used for the primordial stack and global
+ * data area, the POST word must be placed somewhere else. The General
+ * Purpose Timer (GPT) is unused by u-boot and the kernel and preserves
+ * its compare and mask register contents across reset, so it is used
+ * for the POST word.
+ */
+
+#if defined(CFG_INIT_DCACHE_CS)
+# define CFG_INIT_SP_OFFSET	CFG_GBL_DATA_OFFSET
+# define CFG_POST_ALT_WORD_ADDR	(CFG_PERIPHERAL_BASE + GPT0_COMP6)
+#else
+# define CFG_INIT_EXTRA_SIZE	16
+# define CFG_INIT_SP_OFFSET	(CFG_GBL_DATA_OFFSET - CFG_INIT_EXTRA_SIZE)
+# define CFG_POST_WORD_ADDR	(CFG_GBL_DATA_OFFSET - 4)
+# define CFG_OCM_DATA_ADDR	CFG_INIT_RAM_ADDR
+#endif /* defined(CFG_INIT_DCACHE_CS) */
 
 /*-----------------------------------------------------------------------
  * Serial Port
@@ -113,7 +152,55 @@
 /*-----------------------------------------------------------------------
  * DDR SDRAM
  *----------------------------------------------------------------------*/
-#define CFG_MBYTES_SDRAM	256
+#define CFG_MBYTES_SDRAM        (256)		/* 256MB			*/
+
+#define	CFG_SDRAM0_MB0CF_BASE	((  0 << 20) + CFG_SDRAM_BASE)
+#define	CFG_SDRAM0_MB1CF_BASE	((128 << 20) + CFG_SDRAM_BASE)
+
+/* DDR1/2 SDRAM Device Control Register Data Values */
+#define CFG_SDRAM0_MB0CF	((CFG_SDRAM0_MB0CF_BASE >> 3)	| \
+				 SDRAM_RXBAS_SDSZ_128MB 	| \
+				 SDRAM_RXBAS_SDAM_MODE2 	| \
+				 SDRAM_RXBAS_SDBE_ENABLE)
+#define CFG_SDRAM0_MB1CF	((CFG_SDRAM0_MB1CF_BASE >> 3)	| \
+				 SDRAM_RXBAS_SDSZ_128MB 	| \
+				 SDRAM_RXBAS_SDAM_MODE2 	| \
+				 SDRAM_RXBAS_SDBE_ENABLE)
+#define CFG_SDRAM0_MB2CF	SDRAM_RXBAS_SDBE_DISABLE
+#define CFG_SDRAM0_MB3CF	SDRAM_RXBAS_SDBE_DISABLE
+#define CFG_SDRAM0_MCOPT1	0x04322000
+#define CFG_SDRAM0_MCOPT2	0x00000000
+#define CFG_SDRAM0_MODT0	0x01800000
+#define CFG_SDRAM0_MODT1	0x00000000
+#define CFG_SDRAM0_CODT		0x0080f837
+#define CFG_SDRAM0_RTR		0x06180000
+#define CFG_SDRAM0_INITPLR0	0xa8380000
+#define CFG_SDRAM0_INITPLR1	0x81900400
+#define CFG_SDRAM0_INITPLR2	0x81020000
+#define CFG_SDRAM0_INITPLR3	0x81030000
+#define CFG_SDRAM0_INITPLR4	0x81010404
+#define CFG_SDRAM0_INITPLR5	0x81000542
+#define CFG_SDRAM0_INITPLR6	0x81900400
+#define CFG_SDRAM0_INITPLR7	0x8D080000
+#define CFG_SDRAM0_INITPLR8	0x8D080000
+#define CFG_SDRAM0_INITPLR9	0x8D080000
+#define CFG_SDRAM0_INITPLR10	0x8D080000
+#define CFG_SDRAM0_INITPLR11	0x81000442
+#define CFG_SDRAM0_INITPLR12	0x81010780
+#define CFG_SDRAM0_INITPLR13	0x81010400
+#define CFG_SDRAM0_INITPLR14	0x00000000
+#define CFG_SDRAM0_INITPLR15	0x00000000
+#define CFG_SDRAM0_RQDC		0x80000038
+#define CFG_SDRAM0_RFDC		0x00000209
+#define CFG_SDRAM0_RDCC		0x40000000
+#define CFG_SDRAM0_DLCR		0x030000a5
+#define CFG_SDRAM0_CLKTR	0x80000000
+#define CFG_SDRAM0_WRDTR	0x00000000
+#define CFG_SDRAM0_SDTR1	0x80201000
+#define CFG_SDRAM0_SDTR2	0x32204232
+#define CFG_SDRAM0_SDTR3	0x080b0d1a
+#define CFG_SDRAM0_MMODE	0x00000442
+#define CFG_SDRAM0_MEMODE	0x00000404
 
 /*-----------------------------------------------------------------------
  * I2C
@@ -244,8 +331,7 @@
 #define CONFIG_CMD_SNTP
 
 /* POST support */
-#define CONFIG_POST		(CFG_POST_MEMORY	| \
-				 CFG_POST_CACHE		| \
+#define CONFIG_POST		(CFG_POST_CACHE		| \
 				 CFG_POST_CPU		| \
 				 CFG_POST_ETHER		| \
 				 CFG_POST_I2C		| \