ppc4xx: Remove superfluous dram_init() call or replace it by initdram()

Historically the 405 U-Boot port had a dram_init() call in early init
stage. This function was still called from start.S and most of the time
coded in assembler. This is not needed anymore (since a long time) and
boards should implement the common initdram() function in C instead.

This patch now removed the dram_init() call from start.S and removes the
empty implementations that are scattered through most of the 405 board
ports. Some older board ports really implement this dram_init() though.
These are:

csb272
csb472
ERIC
EXBITGEN
W7OLMC
W7OLMG

I changed those boards to call this assembler dram_init() function now
from their board specific initdram() instead. This *should* work, but please
test again on those platforms. And it is perhaps a good idea that those
boards use some common 405 SDRAM initialization code from cpu/ppc4xx at
some time. So further patches welcome here.

Signed-off-by: Stefan Roese <sr@denx.de>

board/amcc/acadia/memory.c

@@ -33,14 +33,6 @@
 
 extern void board_pll_init_f(void);
 
-/*
- * sdram_init - Dummy implementation for start.S, spd_sdram used on this board!
- */
-void sdram_init(void)
-{
-	return;
-}
-
 #if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
 static void cram_bcr_write(u32 wr_val)
 {
@@ -116,10 +108,3 @@ long int initdram(int board_type)
 
 	return (CFG_MBYTES_RAM << 20);
 }
-
-#ifndef CONFIG_NAND_SPL
-int testdram(void)
-{
-	return (0);
-}
-#endif

board/amcc/bubinga/bubinga.c

@@ -66,14 +66,6 @@ int checkboard(void)
 	return (0);
 }
 
-/*
- * sdram_init - Dummy implementation for start.S, spd_sdram used on this board!
- */
-void sdram_init(void)
-{
-	return;
-}
-
 /* -------------------------------------------------------------------------
   initdram(int board_type) reads EEPROM via I2c. EEPROM contains all of
   the necessary info for SDRAM controller configuration
@@ -85,11 +77,3 @@ long int initdram(int board_type)
 	ret = spd_sdram();
 	return ret;
 }
-
-int testdram(void)
-{
-	/* TODO: XXX XXX XXX */
-	printf("test: xxx MB - ok\n");
-
-	return (0);
-}

board/amcc/makalu/makalu.c

@@ -351,8 +351,3 @@ void ft_board_setup(void *blob, bd_t *bd)
 		       fdt_strerror(rc));
 }
 #endif /* defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP) */
-
-void sdram_init(void)
-{
-	return;
-}

board/amcc/walnut/walnut.c

@@ -85,14 +85,6 @@ int checkboard(void)
 	return (0);
 }
 
-/*
- * sdram_init - Dummy implementation for start.S, spd_sdram used on this board!
- */
-void sdram_init(void)
-{
-	return;
-}
-
 /*
  * initdram(int board_type) reads EEPROM via I2c. EEPROM contains all of
  * the necessary info for SDRAM controller configuration
@@ -101,11 +93,3 @@ long int initdram(int board_type)
 {
 	return spd_sdram();
 }
-
-int testdram(void)
-{
-	/* TODO: XXX XXX XXX */
-	printf("test: xxx MB - ok\n");
-
-	return (0);
-}

board/amcc/yosemite/yosemite.c

@@ -200,7 +200,7 @@ int checkboard(void)
 }
 
 /*************************************************************************
- *  sdram_init -- doesn't use serial presence detect.
+ *  initdram -- doesn't use serial presence detect.
  *
  *  Assumes:    256 MB, ECC, non-registered
  *              PLB @ 133 MHz
@@ -281,7 +281,7 @@ void sdram_tr1_set(int ram_address, int* tr1_value)
 	*tr1_value = (first_good + last_bad) / 2;
 }
 
-void sdram_init(void)
+long int initdram(int board)
 {
 	register uint reg;
 	int tr1_bank1, tr1_bank2;
@@ -327,57 +327,11 @@ void sdram_init(void)
 
 	sdram_tr1_set(0x00000000, &tr1_bank1);
 	sdram_tr1_set(0x08000000, &tr1_bank2);
-	mtsdram(mem_tr1, (((tr1_bank1+tr1_bank2)/2) | 0x80800800) );
-}
+	mtsdram(mem_tr1, (((tr1_bank1+tr1_bank2)/2) | 0x80800800));
 
-/*************************************************************************
- *  long int initdram
- *
- ************************************************************************/
-long int initdram(int board)
-{
-	sdram_init();
 	return CFG_SDRAM_BANKS * (CFG_KBYTES_SDRAM * 1024);	/* return bytes */
 }
 
-#if defined(CFG_DRAM_TEST)
-int testdram(void)
-{
-	unsigned long *mem = (unsigned long *)0;
-	const unsigned long kend = (1024 / sizeof(unsigned long));
-	unsigned long k, n;
-
-	mtmsr(0);
-
-	for (k = 0; k < CFG_KBYTES_SDRAM;
-	     ++k, mem += (1024 / sizeof(unsigned long))) {
-		if ((k & 1023) == 0) {
-			printf("%3d MB\r", k / 1024);
-		}
-
-		memset(mem, 0xaaaaaaaa, 1024);
-		for (n = 0; n < kend; ++n) {
-			if (mem[n] != 0xaaaaaaaa) {
-				printf("SDRAM test fails at: %08x\n",
-				       (uint) & mem[n]);
-				return 1;
-			}
-		}
-
-		memset(mem, 0x55555555, 1024);
-		for (n = 0; n < kend; ++n) {
-			if (mem[n] != 0x55555555) {
-				printf("SDRAM test fails at: %08x\n",
-				       (uint) & mem[n]);
-				return 1;
-			}
-		}
-	}
-	printf("SDRAM test passes\n");
-	return 0;
-}
-#endif
-
 /*************************************************************************
  *  pci_pre_init
  *

board/amirix/ap1000/init.S

@@ -28,7 +28,3 @@
 	.globl	ext_bus_cntlr_init
 ext_bus_cntlr_init:
 	blr
-
-	.globl	sdram_init
-sdram_init:
-	blr

board/cray/L1/init.S

@@ -134,14 +134,3 @@ ext_bus_cntlr_init:
 	mtdcr   ebccfgd,r4
 
 	blr
-
-/*----------------------------------------------------------------------------- */
-/* Function:	sdram_init */
-/* Description:	Configures SDRAM memory banks. */
-/*				NOTE: for CrayL1 we have ECC memory, so enable it. */
-/*....now done in C in L1.c:init_sdram for readability. */
-/*----------------------------------------------------------------------------- */
-	.globl  sdram_init
-
-sdram_init:
- blr

board/csb272/csb272.c

@@ -27,6 +27,8 @@
 #include <miiphy.h>
 #include <ppc4xx_enet.h>
 
+void sdram_init(void);
+
 /*
  * Configuration data for AMIS FS6377-01 Programmable 3-PLL Clock Generator
  *
@@ -124,6 +126,13 @@ long initdram (int board_type)
 	ulong bank_size;
 	ulong tmp;
 
+	/*
+	 * ToDo: Move the asm init routine sdram_init() to this C file,
+	 * or even better use some common ppc4xx code available
+	 * in cpu/ppc4xx
+	 */
+	sdram_init();
+
 	tot_size = 0;
 
 	mtdcr (memcfga, mem_mb0cf);

board/csb472/csb472.c

@@ -27,6 +27,8 @@
 #include <miiphy.h>
 #include <ppc4xx_enet.h>
 
+void sdram_init(void);
+
 /*
  * board_early_init_f: do early board initialization
  *
@@ -92,6 +94,13 @@ long initdram (int board_type)
 	ulong bank_size;
 	ulong tmp;
 
+	/*
+	 * ToDo: Move the asm init routine sdram_init() to this C file,
+	 * or even better use some common ppc4xx code available
+	 * in cpu/ppc4xx
+	 */
+	sdram_init();
+
 	tot_size = 0;
 
 	mtdcr (memcfga, mem_mb0cf);

board/eric/eric.c

@@ -31,6 +31,8 @@
 #define PPC405GP_GPIO0_ODR     0xef600718	/* GPIO Open Drain */
 #define PPC405GP_GPIO0_IR      0xef60071c	/* GPIO Input */
 
+void sdram_init(void);
+
 int board_early_init_f (void)
 {
 
@@ -127,6 +129,12 @@ long int initdram (int board_type)
 	int TotalSize;
 #endif
 
+	/*
+	 * ToDo: Move the asm init routine sdram_init() to this C file,
+	 * or even better use some common ppc4xx code available
+	 * in cpu/ppc4xx
+	 */
+	sdram_init();
 
 #ifdef CONFIG_ERIC
 	/*

board/esd/ar405/ar405.c

@@ -190,28 +190,6 @@ int checkboard (void)
 	return 0;
 }
 
-/* ------------------------------------------------------------------------- */
-
-long int initdram (int board_type)
-{
-	unsigned long val;
-
-	mtdcr(memcfga, mem_mb0cf);
-	val = mfdcr(memcfgd);
-
-	return (4*1024*1024 << ((val & 0x000e0000) >> 17));
-}
-
-/* ------------------------------------------------------------------------- */
-
-int testdram (void)
-{
-	/* TODO: XXX XXX XXX */
-	printf ("test: 16 MB - ok\n");
-
-	return (0);
-}
-
 
 #if 1 /* test-only: some internal test routines... */
 /*

board/esd/canbt/canbt.c

@@ -181,22 +181,3 @@ int checkboard (void)
 
 	return 0;
 }
-
-/* ------------------------------------------------------------------------- */
-
-long int initdram (int board_type)
-{
-	return (16 * 1024 * 1024);
-}
-
-/* ------------------------------------------------------------------------- */
-
-int testdram (void)
-{
-	/* TODO: XXX XXX XXX */
-	printf ("test: 16 MB - ok\n");
-
-	return (0);
-}
-
-/* ------------------------------------------------------------------------- */

board/exbitgen/exbitgen.c

@@ -3,6 +3,8 @@
 #include <common.h>
 #include "exbitgen.h"
 
+void sdram_init(void);
+
 /* ************************************************************************ */
 int board_early_init_f (void)
 /* ------------------------------------------------------------------------ --
@@ -83,6 +85,13 @@ long int initdram (int board_type)
 	ulong bank_size;
 	ulong tmp;
 
+	/*
+	 * ToDo: Move the asm init routine sdram_init() to this C file,
+	 * or even better use some common ppc4xx code available
+	 * in cpu/ppc4xx
+	 */
+	sdram_init();
+
 	tot_size = 0;
 
 	mtdcr (memcfga, mem_mb0cf);

board/g2000/g2000.c

@@ -149,41 +149,6 @@ long int initdram (int board_type)
 }
 
 
-#if 1 /* test-only */
-void sdram_init(void)
-{
-	init_sdram_static_settings();
-}
-#endif
-
-
-#if 0 /* test-only */
-long int initdram (int board_type)
-{
-	unsigned long val;
-
-	mtdcr(memcfga, mem_mb0cf);
-	val = mfdcr(memcfgd);
-
-#if 0
-	printf("\nmb0cf=%x\n", val); /* test-only */
-	printf("strap=%x\n", mfdcr(strap)); /* test-only */
-#endif
-
-	return (4*1024*1024 << ((val & 0x000e0000) >> 17));
-}
-#endif
-
-
-int testdram (void)
-{
-	/* TODO: XXX XXX XXX */
-	printf ("test: 16 MB - ok\n");
-
-	return (0);
-}
-
-
 #if defined(CONFIG_CMD_NAND)
 #include <linux/mtd/nand_legacy.h>
 extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];

board/jse/init.S

@@ -93,13 +93,3 @@ ext_bus_cntlr_init:
 	mtdcr   ebccfgd,r4
 
 	blr
-
-
-/*----------------------------------------------------------------------- */
-/* Function:     sdram_init                                               */
-/* Description:  This function is called by cpu/ppc4xx/start.S code       */
-/*               to get the SDRAM initialized.                            */
-/*----------------------------------------------------------------------- */
-	.globl  sdram_init
-sdram_init:
-	blr

board/ml2/init.S

@@ -28,7 +28,3 @@
 	.globl	ext_bus_cntlr_init
 ext_bus_cntlr_init:
 	blr
-
-	.globl  sdram_init
-sdram_init:
-	blr

board/mpl/mip405/init.S

@@ -178,19 +178,6 @@ ext_bus_cntlr_init:
   nop				/* pass2 DCR errata #8 */
   blr
 
-/*-----------------------------------------------------------------------------
- * Function:     sdram_init
- * Description:  Configures the internal SRAM memory. and setup the
- *               Stackpointer in it.
- *----------------------------------------------------------------------------- */
-	.globl  sdram_init
-
-sdram_init:
-
-
-  blr
-
-
 #if defined(CONFIG_BOOT_PCI)
     .section .bootpg,"ax"
     .globl _start_pci

board/mpl/pip405/init.S

@@ -175,19 +175,6 @@
   nop				/* pass2 DCR errata #8 */
   blr
 
-/*-----------------------------------------------------------------------------
- * Function:     sdram_init
- * Description:  Configures the internal SRAM memory. and setup the
- *               Stackpointer in it.
- *----------------------------------------------------------------------------- */
-	.globl  sdram_init
-
-sdram_init:
-
-
-  blr
-
-
 #if defined(CONFIG_BOOT_PCI)
     .section .bootpg,"ax"
     .globl _start_pci

board/netstal/hcu4/hcu4.c

@@ -120,15 +120,6 @@ void hcu_led_set(u32 value)
 	out_be32((u32 *)GPIO0_OR, tmp);
 }
 
-/*
- * sdram_init - Dummy implementation for start.S, spd_sdram  or initdram
- *		used for HCUx
- */
-void sdram_init(void)
-{
-	return;
-}
-
 /*
  * hcu_get_slot
  */

board/netstal/hcu5/sdram.c

@@ -40,28 +40,6 @@
 void hcu_led_set(u32 value);
 void dcbz_area(u32 start_address, u32 num_bytes);
 
-#define DDR_DCR_BASE 0x10
-#define ddrcfga  (DDR_DCR_BASE+0x0)   /* DDR configuration address reg */
-#define ddrcfgd  (DDR_DCR_BASE+0x1)   /* DDR configuration data reg    */
-
-#define DDR0_01_INT_MASK_MASK             0x000000FF
-#define DDR0_00_INT_ACK_ALL               0x7F000000
-#define DDR0_01_INT_MASK_ALL_ON           0x000000FF
-#define DDR0_01_INT_MASK_ALL_OFF          0x00000000
-
-#define DDR0_17_DLLLOCKREG_MASK           0x00010000 /* Read only */
-#define DDR0_17_DLLLOCKREG_UNLOCKED       0x00000000
-#define DDR0_17_DLLLOCKREG_LOCKED         0x00010000
-
-#define DDR0_22                         0x16
-/* ECC */
-#define DDR0_22_CTRL_RAW_MASK             0x03000000
-#define DDR0_22_CTRL_RAW_ECC_DISABLE      0x00000000 /* ECC not enabled */
-#define DDR0_22_CTRL_RAW_ECC_CHECK_ONLY   0x01000000 /* ECC no correction */
-#define DDR0_22_CTRL_RAW_NO_ECC_RAM       0x02000000 /* Not a ECC RAM*/
-#define DDR0_22_CTRL_RAW_ECC_ENABLE       0x03000000 /* ECC correcting on */
-#define DDR0_03_CASLAT_DECODE(n)            ((((unsigned long)(n))>>16)&0x7)
-
 #define ECC_RAM				0x03267F0B
 #define NO_ECC_RAM			0x00267F0B
 
@@ -111,11 +89,11 @@ static int wait_for_dlllock(void)
 	/* -----------------------------------------------------------+
 	 * Wait for the DCC master delay line to finish calibration
 	 * ----------------------------------------------------------*/
-	mtdcr(ddrcfga, DDR0_17);
+	mtdcr(memcfga, DDR0_17);
 	val = DDR0_17_DLLLOCKREG_UNLOCKED;
 
 	while (wait != 0xffff) {
-		val = mfdcr(ddrcfgd);
+		val = mfdcr(memcfgd);
 		if ((val & DDR0_17_DLLLOCKREG_MASK) ==
 		    DDR0_17_DLLLOCKREG_LOCKED)
 			/* dlllockreg bit on */

board/netstal/mcu25/mcu25.c

@@ -127,15 +127,6 @@ void hcu_led_set(u32 value)
    out_be16((u16 *)MCU25_LED_REGISTER_ADDRESS, value);
 }
 
-/*
- * sdram_init - Dummy implementation for start.S, spd_sdram  or initdram
- *		used for HCUx
- */
-void sdram_init(void)
-{
-	return;
-}
-
 /*
  * hcu_get_slot
  */

board/w7o/w7o.c

@@ -31,6 +31,7 @@
 #include <watchdog.h>
 
 unsigned long get_dram_size (void);
+void sdram_init(void);
 
 /*
  * Macros to transform values
@@ -153,6 +154,13 @@ int checkboard (void)
 
 long int initdram (int board_type)
 {
+	/*
+	 * ToDo: Move the asm init routine sdram_init() to this C file,
+	 * or even better use some common ppc4xx code available
+	 * in cpu/ppc4xx
+	 */
+	sdram_init();
+
 	return get_dram_size ();
 }
 

board/xilinx/ml300/init.S

@@ -42,7 +42,3 @@
 	.globl ext_bus_cntlr_init
 ext_bus_cntlr_init:
 	blr
-
-	.globl sdram_init
-sdram_init:
-	blr

cpu/ppc4xx/sdram.c

@@ -164,7 +164,7 @@ static ulong compute_rtr(ulong speed, ulong rows, ulong refresh)
 /*
  * Autodetect onboard SDRAM on 405 platforms
  */
-void sdram_init(void)
+long int initdram(int board_type)
 {
 	ulong speed;
 	ulong sdtr1;
@@ -232,9 +232,15 @@ void sdram_init(void)
 				mtsdram(mem_mcopt1, 0);
 			}
 #endif
-			return;
+
+			/*
+			 * OK, size detected -> all done
+			 */
+			return mb0cf[i].size;
 		}
 	}
+
+	return 0;
 }
 
 #else /* CONFIG_440 */

cpu/ppc4xx/start.S

@@ -217,7 +217,6 @@
 
 
 	.extern ext_bus_cntlr_init
-	.extern sdram_init
 #ifdef CONFIG_NAND_U_BOOT
 	.extern reconfig_tlb0
 #endif
@@ -1119,11 +1118,6 @@ _start:
 	stw	r0, +12(r1)		/* Save return addr (underflow vect) */
 #endif /* CFG_INIT_DCACHE_CS */
 
-	/*----------------------------------------------------------------------- */
-	/* Initialize SDRAM Controller	*/
-	/*----------------------------------------------------------------------- */
-	bl	sdram_init
-
 #ifdef CONFIG_NAND_SPL
 	bl	nand_boot_common	/* will not return */
 #else