Auto-size RAM on canmb board.

Cleanup.

1 files changed, 188 insertions, 43 deletions

diff --git a/board/canmb/canmb.c b/board/canmb/canmb.c
index 172fcd7..3d3abf7 100644
--- a/board/canmb/canmb.c
+++ b/board/canmb/canmb.c
@@ -2,8 +2,8 @@
  * (C) Copyright 2005
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
- * (C) Copyright 2003
- * Reinhard Meyer, EMK Elektronik GmbH, r.meyer@emk-elektronik.de
+ * (C) Copyright 2004
+ * Mark Jonas, Freescale Semiconductor, mark.jonas@motorola.com.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -28,64 +28,209 @@
 #include <mpc5xxx.h>
 #include <pci.h>
 
-/*****************************************************************************
- * initialize SDRAM/DDRAM controller.
- * TBD: get data from I2C EEPROM
- *****************************************************************************/
-long int initdram (int board_type)
-{
-	ulong dramsize = 0;
-#ifndef CFG_RAMBOOT
-#if 0
-	ulong	t;
-	ulong	tap_del;
+#if defined(CONFIG_MPC5200_DDR)
+#include "mt46v16m16-75.h"
+#else
+#include "mt48lc16m32s2-75.h"
 #endif
 
-	#define	MODE_EN		0x80000000
-	#define	SOFT_PRE	2
-	#define	SOFT_REF	4
-
-	/* configure SDRAM start/end */
-	*(vu_long *)MPC5XXX_SDRAM_CS0CFG = (CFG_SDRAM_BASE & 0xFFF00000) | CFG_DRAM_RAM_SIZE;
-	*(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x8000000;
-
-	/* setup config registers */
-	*(vu_long *)MPC5XXX_SDRAM_CONFIG1 = CFG_DRAM_CONFIG1;
-	*(vu_long *)MPC5XXX_SDRAM_CONFIG2 = CFG_DRAM_CONFIG2;
+#ifndef CFG_RAMBOOT
+static void sdram_start (int hi_addr)
+{
+	long hi_addr_bit = hi_addr ? 0x01000000 : 0;
 
 	/* unlock mode register */
-	*(vu_long *)MPC5XXX_SDRAM_CTRL = CFG_DRAM_CONTROL | MODE_EN;
+	*(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | 0x80000000 | hi_addr_bit;
+	__asm__ volatile ("sync");
+
 	/* precharge all banks */
-	*(vu_long *)MPC5XXX_SDRAM_CTRL = CFG_DRAM_CONTROL | MODE_EN | SOFT_PRE;
-#ifdef CFG_DRAM_DDR
-	/* set extended mode register */
-	*(vu_short *)MPC5XXX_SDRAM_MODE = CFG_DRAM_EMODE;
+	*(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
+	__asm__ volatile ("sync");
+
+#if SDRAM_DDR
+	/* set mode register: extended mode */
+	*(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_EMODE;
+	__asm__ volatile ("sync");
+
+	/* set mode register: reset DLL */
+	*(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE | 0x04000000;
+	__asm__ volatile ("sync");
 #endif
-	/* set mode register */
-	*(vu_short *)MPC5XXX_SDRAM_MODE = CFG_DRAM_MODE | 0x0400;
+
 	/* precharge all banks */
-	*(vu_long *)MPC5XXX_SDRAM_CTRL = CFG_DRAM_CONTROL | MODE_EN | SOFT_PRE;
+	*(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
+	__asm__ volatile ("sync");
+
 	/* auto refresh */
-	*(vu_long *)MPC5XXX_SDRAM_CTRL = CFG_DRAM_CONTROL | MODE_EN | SOFT_REF;
+	*(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | 0x80000004 | hi_addr_bit;
+	__asm__ volatile ("sync");
+
 	/* set mode register */
-	*(vu_short *)MPC5XXX_SDRAM_MODE = CFG_DRAM_MODE;
+	*(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
+	__asm__ volatile ("sync");
+
 	/* normal operation */
-	*(vu_long *)MPC5XXX_SDRAM_CTRL = CFG_DRAM_CONTROL;
-	/* write default TAP delay */
-	*(vu_long *)MPC5XXX_CDM_PORCFG = CFG_DRAM_TAP_DEL << 24;
+	*(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | hi_addr_bit;
+	__asm__ volatile ("sync");
+}
+#endif
+
+/*
+ * ATTENTION: Although partially referenced initdram does NOT make real use
+ *            use of CFG_SDRAM_BASE. The code does not work if CFG_SDRAM_BASE
+ *            is something else than 0x00000000.
+ */
+
+#if defined(CONFIG_MPC5200)
+long int initdram (int board_type)
+{
+	ulong dramsize = 0;
+	ulong dramsize2 = 0;
+#ifndef CFG_RAMBOOT
+	ulong test1, test2;
+
+	/* setup SDRAM chip selects */
+	*(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x0000001e;/* 2G at 0x0 */
+	*(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x80000000;/* disabled */
+	__asm__ volatile ("sync");
+
+	/* setup config registers */
+	*(vu_long *)MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1;
+	*(vu_long *)MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
+	__asm__ volatile ("sync");
+
+#if SDRAM_DDR
+	/* set tap delay */
+	*(vu_long *)MPC5XXX_CDM_PORCFG = SDRAM_TAPDELAY;
+	__asm__ volatile ("sync");
+#endif
+
+	/* find RAM size using SDRAM CS0 only */
+	sdram_start(0);
+	test1 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
+	sdram_start(1);
+	test2 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
+	if (test1 > test2) {
+		sdram_start(0);
+		dramsize = test1;
+	} else {
+		dramsize = test2;
+	}
+
+	/* memory smaller than 1MB is impossible */
+	if (dramsize < (1 << 20)) {
+		dramsize = 0;
+	}
+
+	/* set SDRAM CS0 size according to the amount of RAM found */
+	if (dramsize > 0) {
+		*(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x13 + __builtin_ffs(dramsize >> 20) - 1;
+	} else {
+		*(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0; /* disabled */
+	}
+
+	/* let SDRAM CS1 start right after CS0 */
+	*(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e;/* 2G */
+
+	/* find RAM size using SDRAM CS1 only */
+	sdram_start(0);
+	test1 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000);
+	sdram_start(1);
+	test2 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000);
+	if (test1 > test2) {
+		sdram_start(0);
+		dramsize2 = test1;
+	} else {
+		dramsize2 = test2;
+	}
+
+	/* memory smaller than 1MB is impossible */
+	if (dramsize2 < (1 << 20)) {
+		dramsize2 = 0;
+	}
+
+	/* set SDRAM CS1 size according to the amount of RAM found */
+	if (dramsize2 > 0) {
+		*(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize
+			| (0x13 + __builtin_ffs(dramsize2 >> 20) - 1);
+	} else {
+		*(vu_long *)MPC5XXX_SDRAM_CS1CFG = dramsize; /* disabled */
+	}
+
+#else /* CFG_RAMBOOT */
+
+	/* retrieve size of memory connected to SDRAM CS0 */
+	dramsize = *(vu_long *)MPC5XXX_SDRAM_CS0CFG & 0xFF;
+	if (dramsize >= 0x13) {
+		dramsize = (1 << (dramsize - 0x13)) << 20;
+	} else {
+		dramsize = 0;
+	}
+
+	/* retrieve size of memory connected to SDRAM CS1 */
+	dramsize2 = *(vu_long *)MPC5XXX_SDRAM_CS1CFG & 0xFF;
+	if (dramsize2 >= 0x13) {
+		dramsize2 = (1 << (dramsize2 - 0x13)) << 20;
+	} else {
+		dramsize2 = 0;
+	}
 
 #endif /* CFG_RAMBOOT */
 
-	dramsize = ((1 << (*(vu_long *)MPC5XXX_SDRAM_CS0CFG - 0x13)) << 20) +
-		((1 << (*(vu_long *)MPC5XXX_SDRAM_CS1CFG - 0x13)) << 20);
+	return dramsize + dramsize2;
+}
+
+#elif defined(CONFIG_MGT5100)
+
+long int initdram (int board_type)
+{
+	ulong dramsize = 0;
+#ifndef CFG_RAMBOOT
+	ulong test1, test2;
+
+	/* setup and enable SDRAM chip selects */
+	*(vu_long *)MPC5XXX_SDRAM_START = 0x00000000;
+	*(vu_long *)MPC5XXX_SDRAM_STOP = 0x0000ffff;/* 2G */
+	*(vu_long *)MPC5XXX_ADDECR |= (1 << 22); /* Enable SDRAM */
+	__asm__ volatile ("sync");
+
+	/* setup config registers */
+	*(vu_long *)MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1;
+	*(vu_long *)MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
+
+	/* address select register */
+	*(vu_long *)MPC5XXX_SDRAM_XLBSEL = SDRAM_ADDRSEL;
+	__asm__ volatile ("sync");
+
+	/* find RAM size */
+	sdram_start(0);
+	test1 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
+	sdram_start(1);
+	test2 = get_ram_size((ulong *)CFG_SDRAM_BASE, 0x80000000);
+	if (test1 > test2) {
+		sdram_start(0);
+		dramsize = test1;
+	} else {
+		dramsize = test2;
+	}
+
+	/* set SDRAM end address according to size */
+	*(vu_long *)MPC5XXX_SDRAM_STOP = ((dramsize - 1) >> 15);
+
+#else /* CFG_RAMBOOT */
+
+	/* Retrieve amount of SDRAM available */
+	dramsize = ((*(vu_long *)MPC5XXX_SDRAM_STOP + 1) << 15);
+
+#endif /* CFG_RAMBOOT */
 
-	/* return total ram size */
 	return dramsize;
 }
 
-/*****************************************************************************
- * print board identification
- *****************************************************************************/
+#else
+#error Neither CONFIG_MPC5200 or CONFIG_MGT5100 defined
+#endif
+
 int checkboard (void)
 {
 	puts ("Board: CANMB\n");