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authorTsiChungLiew <Tsi-Chung.Liew@freescale.com>2007-08-15 20:32:06 -0500
committerJohn Rigby <jrigby@freescale.com>2007-08-16 17:43:20 -0600
commitf28e1bd9daa6de5eb33ae4822bda6b008ccb4e9e (patch)
tree1cddf80f261eb34e934d4a647264b7d0a27d2bbf /board/m5282evb/m5282evb.c
parent870470dbf6f4bb9864e0d97aeedbc17c167c6d1c (diff)
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ColdFire: Update Freescale MCF52x2 platforms
Signed-off-by: TsiChungLiew <Tsi-Chung.Liew@freescale.com>
Diffstat (limited to 'board/m5282evb/m5282evb.c')
-rw-r--r--board/m5282evb/m5282evb.c61
1 files changed, 59 insertions, 2 deletions
diff --git a/board/m5282evb/m5282evb.c b/board/m5282evb/m5282evb.c
index a08af68..243d6a4 100644
--- a/board/m5282evb/m5282evb.c
+++ b/board/m5282evb/m5282evb.c
@@ -22,14 +22,71 @@
*/
#include <common.h>
+#include <asm/immap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
int checkboard (void)
{
- puts ("MOTOROLA M5272EVB Evaluation Board\n");
+ puts ("Board: Freescale M5282EVB Evaluation Board\n");
return 0;
}
long int initdram (int board_type)
{
- return 0x1000000;
+ u32 dramsize, i, dramclk;
+
+ dramsize = CFG_SDRAM_SIZE * 0x100000;
+ for (i = 0x13; i < 0x20; i++) {
+ if (dramsize == (1 << i))
+ break;
+ }
+ i--;
+
+ if (!(MCFSDRAMC_DACR0 & MCFSDRAMC_DACR_RE))
+ {
+ dramclk = gd->bus_clk / (CFG_HZ * CFG_HZ);
+
+ /* Initialize DRAM Control Register: DCR */
+ MCFSDRAMC_DCR = (0
+ | MCFSDRAMC_DCR_RTIM_6
+ | MCFSDRAMC_DCR_RC((15 * dramclk)>>4));
+
+ /* Initialize DACR0 */
+ MCFSDRAMC_DACR0 = (0
+ | MCFSDRAMC_DACR_BASE(CFG_SDRAM_BASE)
+ | MCFSDRAMC_DACR_CASL(1)
+ | MCFSDRAMC_DACR_CBM(3)
+ | MCFSDRAMC_DACR_PS_32);
+
+ /* Initialize DMR0 */
+ MCFSDRAMC_DMR0 = (0
+ | ((dramsize - 1) & 0xFFFC0000)
+ | MCFSDRAMC_DMR_V);
+
+ /* Set IP (bit 3) in DACR */
+ MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IP;
+
+ /* Wait 30ns to allow banks to precharge */
+ for (i = 0; i < 5; i++) {
+ asm ("nop");
+ }
+
+ /* Write to this block to initiate precharge */
+ *(u32 *)(CFG_SDRAM_BASE) = 0xA5A59696;
+
+ /* Set RE (bit 15) in DACR */
+ MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_RE;
+
+ /* Wait for at least 8 auto refresh cycles to occur */
+ for (i = 0; i < 2000; i++) {
+ asm(" nop");
+ }
+
+ /* Finish the configuration by issuing the IMRS. */
+ MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IMRS;
+
+ /* Write to the SDRAM Mode Register */
+ *(u32 *)(CFG_SDRAM_BASE + 0x400) = 0xA5A59696;
+ }
}