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

This patch (Part 1 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>

3 files changed, 197 insertions, 15 deletions

diff --git a/include/asm-ppc/processor.h b/include/asm-ppc/processor.h
index 8bdfb9d..cfd8440 100644
--- a/include/asm-ppc/processor.h
+++ b/include/asm-ppc/processor.h
@@ -460,17 +460,19 @@
 #define SPRN_PID2	0x27a	/* Process ID Register 2 */
 #define SPRN_MCSR	0x23c	/* Machine Check Syndrome register */
 #define SPRN_MCAR	0x23d	/* Machine Check Address register */
-#ifdef CONFIG_440
 #define MCSR_MCS	0x80000000	/* Machine Check Summary */
 #define MCSR_IB		0x40000000	/* Instruction PLB Error */
+#if defined(CONFIG_440)
 #define MCSR_DRB	0x20000000	/* Data Read PLB Error */
 #define MCSR_DWB	0x10000000	/* Data Write PLB Error */
+#else
+#define MCSR_DB		0x20000000	/* Data PLB Error */
+#endif /* defined(CONFIG_440) */
 #define MCSR_TLBP	0x08000000	/* TLB Parity Error */
 #define MCSR_ICP	0x04000000	/* I-Cache Parity Error */
 #define MCSR_DCSP	0x02000000	/* D-Cache Search Parity Error */
 #define MCSR_DCFP	0x01000000	/* D-Cache Flush Parity Error */
 #define MCSR_IMPE	0x00800000	/* Imprecise Machine Check Exception */
-#endif
 #define ESR_ST		0x00800000	/* Store Operation */
 
 #if defined(CONFIG_MPC86xx)
diff --git a/include/ppc405.h b/include/ppc405.h
index d953378..c994289 100644
--- a/include/ppc405.h
+++ b/include/ppc405.h
@@ -22,6 +22,10 @@
 #ifndef	__PPC405_H__
 #define __PPC405_H__
 
+/* Define bits and masks for real-mode storage attribute control registers */
+#define PPC_128MB_SACR_BIT(addr)	((addr) >> 27)
+#define PPC_128MB_SACR_VALUE(addr)	PPC_REG_VAL(PPC_128MB_SACR_BIT(addr),1)
+
 #ifndef CONFIG_IOP480
 #define CFG_DCACHE_SIZE		(16 << 10)	/* For AMCC 405 CPUs	*/
 #else
@@ -363,6 +367,120 @@
 #endif	/* defined(CONFIG_405EZ) */
 
 /******************************************************************************
+ * External Bus Controller (EBC)
+ *****************************************************************************/
+
+/* Bank Configuration Register */
+#define	EBC_BXCR_BAS_MASK	PPC_REG_VAL(11, 0xFFF)
+#define EBC_BXCR_BAS_ENCODE(n)	(((static_cast(unsigned long, n)) & \
+				  EBC_BXCR_BAS_MASK) << 0)
+#define EBC_BXCR_BS_MASK	PPC_REG_VAL(14, 0x7)
+#define EBC_BXCR_BS_1MB		PPC_REG_VAL(14, 0x0)
+#define EBC_BXCR_BS_2MB		PPC_REG_VAL(14, 0x1)
+#define EBC_BXCR_BS_4MB		PPC_REG_VAL(14, 0x2)
+#define EBC_BXCR_BS_8MB		PPC_REG_VAL(14, 0x3)
+#define EBC_BXCR_BS_16MB	PPC_REG_VAL(14, 0x4)
+#define EBC_BXCR_BS_32MB	PPC_REG_VAL(14, 0x5)
+#define EBC_BXCR_BS_64MB	PPC_REG_VAL(14, 0x6)
+#define EBC_BXCR_BS_128MB	PPC_REG_VAL(14, 0x7)
+#define EBC_BXCR_BU_MASK	PPC_REG_VAL(16, 0x3)
+#define	EBC_BXCR_BU_NONE	PPC_REG_VAL(16, 0x0)
+#define EBC_BXCR_BU_R		PPC_REG_VAL(16, 0x1)
+#define EBC_BXCR_BU_W		PPC_REG_VAL(16, 0x2)
+#define EBC_BXCR_BU_RW		PPC_REG_VAL(16, 0x3)
+#define EBC_BXCR_BW_MASK	PPC_REG_VAL(18, 0x3)
+#define EBC_BXCR_BW_8BIT	PPC_REG_VAL(18, 0x0)
+#define EBC_BXCR_BW_16BIT	PPC_REG_VAL(18, 0x1)
+#define EBC_BXCR_BW_32BIT	PPC_REG_VAL(18, 0x3)
+
+/* Bank Access Parameter Register */
+#define EBC_BXAP_BME_ENABLED	PPC_REG_VAL(0, 0x1)
+#define EBC_BXAP_BME_DISABLED	PPC_REG_VAL(0, 0x0)
+#define EBC_BXAP_TWT_ENCODE(n)	PPC_REG_VAL(8, \
+					    (static_cast(unsigned long, n)) \
+					    & 0xFF)
+#define	EBC_BXAP_FWT_ENCODE(n)	PPC_REG_VAL(5, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x1F)
+#define	EBC_BXAP_BWT_ENCODE(n)	PPC_REG_VAL(8, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x7)
+#define EBC_BXAP_BCE_DISABLE	PPC_REG_VAL(9, 0x0)
+#define EBC_BXAP_BCE_ENABLE	PPC_REG_VAL(9, 0x1)
+#define EBC_BXAP_BCT_MASK	PPC_REG_VAL(11, 0x3)
+#define EBC_BXAP_BCT_2TRANS	PPC_REG_VAL(11, 0x0)
+#define EBC_BXAP_BCT_4TRANS	PPC_REG_VAL(11, 0x1)
+#define EBC_BXAP_BCT_8TRANS	PPC_REG_VAL(11, 0x2)
+#define EBC_BXAP_BCT_16TRANS	PPC_REG_VAL(11, 0x3)
+#define EBC_BXAP_CSN_ENCODE(n)	PPC_REG_VAL(13, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x3)
+#define EBC_BXAP_OEN_ENCODE(n)	PPC_REG_VAL(15, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x3)
+#define EBC_BXAP_WBN_ENCODE(n)	PPC_REG_VAL(17, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x3)
+#define EBC_BXAP_WBF_ENCODE(n)	PPC_REG_VAL(19, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x3)
+#define EBC_BXAP_TH_ENCODE(n)	PPC_REG_VAL(22, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x7)
+#define EBC_BXAP_RE_ENABLED	PPC_REG_VAL(23, 0x1)
+#define EBC_BXAP_RE_DISABLED	PPC_REG_VAL(23, 0x0)
+#define EBC_BXAP_SOR_DELAYED	PPC_REG_VAL(24, 0x0)
+#define EBC_BXAP_SOR_NONDELAYED	PPC_REG_VAL(24, 0x1)
+#define EBC_BXAP_BEM_WRITEONLY	PPC_REG_VAL(25, 0x0)
+#define EBC_BXAP_BEM_RW		PPC_REG_VAL(25, 0x1)
+#define EBC_BXAP_PEN_DISABLED	PPC_REG_VAL(26, 0x0)
+#define EBC_BXAP_PEN_ENABLED	PPC_REG_VAL(26, 0x1)
+
+/* Configuration Register */
+#define EBC_CFG_LE_MASK		PPC_REG_VAL(0, 0x1)
+#define EBC_CFG_LE_UNLOCK	PPC_REG_VAL(0, 0x0)
+#define EBC_CFG_LE_LOCK		PPC_REG_VAL(0, 0x1)
+#define EBC_CFG_PTD_MASK	PPC_REG_VAL(1, 0x1)
+#define EBC_CFG_PTD_ENABLE	PPC_REG_VAL(1, 0x0)
+#define EBC_CFG_PTD_DISABLE	PPC_REG_VAL(1, 0x1)
+#define EBC_CFG_RTC_MASK	PPC_REG_VAL(4, 0x7)
+#define EBC_CFG_RTC_16PERCLK	PPC_REG_VAL(4, 0x0)
+#define EBC_CFG_RTC_32PERCLK	PPC_REG_VAL(4, 0x1)
+#define EBC_CFG_RTC_64PERCLK	PPC_REG_VAL(4, 0x2)
+#define EBC_CFG_RTC_128PERCLK	PPC_REG_VAL(4, 0x3)
+#define EBC_CFG_RTC_256PERCLK	PPC_REG_VAL(4, 0x4)
+#define EBC_CFG_RTC_512PERCLK	PPC_REG_VAL(4, 0x5)
+#define EBC_CFG_RTC_1024PERCLK	PPC_REG_VAL(4, 0x6)
+#define EBC_CFG_RTC_2048PERCLK	PPC_REG_VAL(4, 0x7)
+#define EBC_CFG_ATC_MASK	PPC_REG_VAL(5, 0x1)
+#define EBC_CFG_ATC_HI		PPC_REG_VAL(5, 0x0)
+#define EBC_CFG_ATC_PREVIOUS	PPC_REG_VAL(5, 0x1)
+#define EBC_CFG_DTC_MASK	PPC_REG_VAL(6, 0x1)
+#define EBC_CFG_DTC_HI		PPC_REG_VAL(6, 0x0)
+#define EBC_CFG_DTC_PREVIOUS	PPC_REG_VAL(6, 0x1)
+#define EBC_CFG_CTC_MASK	PPC_REG_VAL(7, 0x1)
+#define EBC_CFG_CTC_HI		PPC_REG_VAL(7, 0x0)
+#define EBC_CFG_CTC_PREVIOUS	PPC_REG_VAL(7, 0x1)
+#define EBC_CFG_OEO_MASK	PPC_REG_VAL(8, 0x1)
+#define EBC_CFG_OEO_DISABLE	PPC_REG_VAL(8, 0x0)
+#define EBC_CFG_OEO_ENABLE	PPC_REG_VAL(8, 0x1)
+#define EBC_CFG_EMC_MASK	PPC_REG_VAL(9, 0x1)
+#define EBC_CFG_EMC_NONDEFAULT	PPC_REG_VAL(9, 0x0)
+#define EBC_CFG_EMC_DEFAULT	PPC_REG_VAL(9, 0x1)
+#define EBC_CFG_PME_MASK	PPC_REG_VAL(14, 0x1)
+#define EBC_CFG_PME_DISABLE	PPC_REG_VAL(14, 0x0)
+#define EBC_CFG_PME_ENABLE	PPC_REG_VAL(14, 0x1)
+#define EBC_CFG_PMT_MASK	PPC_REG_VAL(19, 0x1F)
+#define EBC_CFG_PMT_ENCODE(n)	PPC_REG_VAL(19, \
+					    (static_cast(unsigned long, n)) \
+					    & 0x1F)
+#define EBC_CFG_PR_MASK		PPC_REG_VAL(21, 0x3)
+#define EBC_CFG_PR_16		PPC_REG_VAL(21, 0x0)
+#define EBC_CFG_PR_32		PPC_REG_VAL(21, 0x1)
+#define EBC_CFG_PR_64		PPC_REG_VAL(21, 0x2)
+#define EBC_CFG_PR_128		PPC_REG_VAL(21, 0x3)
+
+/******************************************************************************
  * SDRAM Controller
  ******************************************************************************/
   /* values for memcfga register - indirect addressing of these regs */
@@ -1218,19 +1336,43 @@
 
 /*-----------------------------------------------------------------------------+
 |  Memory Bank 0-7 configuration
-+-----------------------------------------------------------------------------*/
-#define SDRAM_RXBAS_SDSZ_4	   0x00000000	   /*	4M		      */
-#define SDRAM_RXBAS_SDSZ_8	   0x00001000	   /*	8M		      */
-#define SDRAM_RXBAS_SDSZ_16	   0x00002000	   /*  16M		      */
-#define SDRAM_RXBAS_SDSZ_32	   0x00003000	   /*  32M		      */
-#define SDRAM_RXBAS_SDSZ_64	   0x00004000	   /*  64M		      */
-#define SDRAM_RXBAS_SDSZ_128	   0x00005000	   /* 128M		      */
-#define SDRAM_RXBAS_SDSZ_256	   0x00006000	   /* 256M		      */
-#define SDRAM_RXBAS_SDSZ_512	   0x00007000	   /* 512M		      */
-#define SDRAM_RXBAS_SDSZ_1024	   0x00008000	   /* 1024M		      */
-#define SDRAM_RXBAS_SDSZ_2048	   0x00009000	   /* 2048M		      */
-#define SDRAM_RXBAS_SDSZ_4096	   0x0000a000	   /* 4096M		      */
-#define SDRAM_RXBAS_SDSZ_8192	   0x0000b000	   /* 8192M		      */
++----------------------------------------------------------------------------*/
+#define SDRAM_RXBAS_SDSZ_MASK		PPC_REG_VAL(19, 0xF)
+#define SDRAM_RXBAS_SDSZ_4MB	   	PPC_REG_VAL(19, 0x0)
+#define SDRAM_RXBAS_SDSZ_8MB	   	PPC_REG_VAL(19, 0x1)
+#define SDRAM_RXBAS_SDSZ_16MB	   	PPC_REG_VAL(19, 0x2)
+#define SDRAM_RXBAS_SDSZ_32MB	   	PPC_REG_VAL(19, 0x3)
+#define SDRAM_RXBAS_SDSZ_64MB	   	PPC_REG_VAL(19, 0x4)
+#define SDRAM_RXBAS_SDSZ_128MB	   	PPC_REG_VAL(19, 0x5)
+#define SDRAM_RXBAS_SDSZ_256MB	   	PPC_REG_VAL(19, 0x6)
+#define SDRAM_RXBAS_SDSZ_512MB	   	PPC_REG_VAL(19, 0x7)
+#define SDRAM_RXBAS_SDSZ_1024MB	   	PPC_REG_VAL(19, 0x8)
+#define SDRAM_RXBAS_SDSZ_2048MB	   	PPC_REG_VAL(19, 0x9)
+#define SDRAM_RXBAS_SDSZ_4096MB		PPC_REG_VAL(19, 0xA)
+#define SDRAM_RXBAS_SDSZ_8192MB		PPC_REG_VAL(19, 0xB)
+#define SDRAM_RXBAS_SDSZ_8      	SDRAM_RXBAS_SDSZ_8MB
+#define SDRAM_RXBAS_SDSZ_16     	SDRAM_RXBAS_SDSZ_16MB
+#define SDRAM_RXBAS_SDSZ_32     	SDRAM_RXBAS_SDSZ_32MB
+#define SDRAM_RXBAS_SDSZ_64     	SDRAM_RXBAS_SDSZ_64MB
+#define SDRAM_RXBAS_SDSZ_128    	SDRAM_RXBAS_SDSZ_128MB
+#define SDRAM_RXBAS_SDSZ_256    	SDRAM_RXBAS_SDSZ_256MB
+#define SDRAM_RXBAS_SDSZ_512    	SDRAM_RXBAS_SDSZ_512MB
+#define SDRAM_RXBAS_SDSZ_1024		SDRAM_RXBAS_SDSZ_1024MB
+#define SDRAM_RXBAS_SDSZ_2048		SDRAM_RXBAS_SDSZ_2048MB
+#define SDRAM_RXBAS_SDSZ_4096		SDRAM_RXBAS_SDSZ_4096MB
+#define SDRAM_RXBAS_SDSZ_8192		SDRAM_RXBAS_SDSZ_8192MB
+#define SDRAM_RXBAS_SDAM_MODE0		PPC_REG_VAL(23, 0x0)
+#define SDRAM_RXBAS_SDAM_MODE1		PPC_REG_VAL(23, 0x1)
+#define SDRAM_RXBAS_SDAM_MODE2		PPC_REG_VAL(23, 0x2)
+#define SDRAM_RXBAS_SDAM_MODE3		PPC_REG_VAL(23, 0x3)
+#define SDRAM_RXBAS_SDAM_MODE4		PPC_REG_VAL(23, 0x4)
+#define SDRAM_RXBAS_SDAM_MODE5		PPC_REG_VAL(23, 0x5)
+#define SDRAM_RXBAS_SDAM_MODE6		PPC_REG_VAL(23, 0x6)
+#define SDRAM_RXBAS_SDAM_MODE7		PPC_REG_VAL(23, 0x7)
+#define SDRAM_RXBAS_SDAM_MODE8		PPC_REG_VAL(23, 0x8)
+#define SDRAM_RXBAS_SDAM_MODE9		PPC_REG_VAL(23, 0x9)
+#define SDRAM_RXBAS_SDBE_DISABLE	PPC_REG_VAL(31, 0x0)
+#define SDRAM_RXBAS_SDBE_ENABLE		PPC_REG_VAL(31, 0x1)
 
 /*-----------------------------------------------------------------------------+
 |  Memory Controller Status
@@ -1612,4 +1754,27 @@
 #define SDR0_PFC1_GPT_FREQ	0x0000000f
 #endif
 
+/* General Purpose Timer (GPT) Register Offsets */
+#define GPT0_TBC		0x00000000
+#define GPT0_IM			0x00000018
+#define GPT0_ISS		0x0000001C
+#define GPT0_ISC		0x00000020
+#define GPT0_IE			0x00000024
+#define GPT0_COMP0		0x00000080
+#define GPT0_COMP1		0x00000084
+#define GPT0_COMP2		0x00000088
+#define GPT0_COMP3		0x0000008C
+#define GPT0_COMP4		0x00000090
+#define GPT0_COMP5		0x00000094
+#define GPT0_COMP6		0x00000098
+#define GPT0_MASK0		0x000000C0
+#define GPT0_MASK1		0x000000C4
+#define GPT0_MASK2		0x000000C8
+#define GPT0_MASK3		0x000000CC
+#define GPT0_MASK4		0x000000D0
+#define GPT0_MASK5		0x000000D4
+#define GPT0_MASK6		0x000000D8
+#define GPT0_DCT0		0x00000110
+#define GPT0_DCIS		0x0000011C
+
 #endif	/* __PPC405_H__ */
diff --git a/include/ppc4xx.h b/include/ppc4xx.h
index 76fe872..4a6eb86 100644
--- a/include/ppc4xx.h
+++ b/include/ppc4xx.h
@@ -29,6 +29,21 @@
 #endif
 
 /*
+ * Macro for generating register field mnemonics
+ */
+#define	PPC_REG_BITS		32
+#define	PPC_REG_VAL(bit, value)	((value) << ((PPC_REG_BITS - 1) - (bit)))
+
+/*
+ * Elide casts when assembling register mnemonics
+ */
+#ifndef __ASSEMBLY__
+#define	static_cast(type, val)	(type)(val)
+#else
+#define	static_cast(type, val)	(val)
+#endif
+
+/*
  * Common stuff for 4xx (405 and 440)
  */