diff options
Diffstat (limited to 'u-boot/board/freescale/m5249evb/m5249evb.c')
| -rw-r--r-- | u-boot/board/freescale/m5249evb/m5249evb.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/u-boot/board/freescale/m5249evb/m5249evb.c b/u-boot/board/freescale/m5249evb/m5249evb.c new file mode 100644 index 0000000..894873b --- /dev/null +++ b/u-boot/board/freescale/m5249evb/m5249evb.c @@ -0,0 +1,109 @@ +/* + * (C) Copyright 2004 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> +#include <malloc.h> +#include <asm/immap.h> + +int checkboard (void) { + ulong val; + uchar val8; + + puts ("Board: "); + puts("Freescale M5249EVB"); + val8 = ((uchar)~((uchar)mbar2_readLong(MCFSIM_GPIO1_READ) >> 4)) & 0xf; + printf(" (Switch=%1X)\n", val8); + + /* + * Set LED on + */ + val = mbar2_readLong(MCFSIM_GPIO1_OUT) & ~CONFIG_SYS_GPIO1_LED; + mbar2_writeLong(MCFSIM_GPIO1_OUT, val); /* Set LED on */ + + return 0; +}; + + +phys_size_t initdram (int board_type) { + unsigned long junk = 0xa5a59696; + + /* + * Note: + * RC = ([(RefreshTime/#rows) / (1/BusClk)] / 16) - 1 + */ + +#ifdef CONFIG_SYS_FAST_CLK + /* + * Busclk=70MHz, RefreshTime=64ms, #rows=4096 (4K) + * SO=1, NAM=0, COC=0, RTIM=01 (6clk refresh), RC=39 + */ + mbar_writeShort(MCFSIM_DCR, 0x8239); +#elif CONFIG_SYS_PLL_BYPASS + /* + * Busclk=5.6448MHz, RefreshTime=64ms, #rows=8192 (8K) + * SO=1, NAM=0, COC=0, RTIM=01 (6clk refresh), RC=02 + */ + mbar_writeShort(MCFSIM_DCR, 0x8202); +#else + /* + * Busclk=36MHz, RefreshTime=64ms, #rows=4096 (4K) + * SO=1, NAM=0, COC=0, RTIM=01 (6clk refresh), RC=22 (562 bus clock cycles) + */ + mbar_writeShort(MCFSIM_DCR, 0x8222); +#endif + + /* + * SDRAM starts at 0x0000_0000, CASL=10, CBM=010, PS=10 (16bit port), + * PM=1 (continuous page mode) + */ + + /* RE=0 (keep auto-refresh disabled while setting up registers) */ + mbar_writeLong(MCFSIM_DACR0, 0x00003324); + + /* BAM=007c (bits 22,21 are bank selects; 256kB blocks) */ + mbar_writeLong(MCFSIM_DMR0, 0x01fc0001); + + /** Precharge sequence **/ + mbar_writeLong(MCFSIM_DACR0, 0x0000332c); /* Set DACR0[IP] (bit 3) */ + *((volatile unsigned long *) 0x00) = junk; /* write to a memory location to init. precharge */ + udelay(0x10); /* Allow several Precharge cycles */ + + /** Refresh Sequence **/ + mbar_writeLong(MCFSIM_DACR0, 0x0000b324); /* Enable the refresh bit, DACR0[RE] (bit 15) */ + udelay(0x7d0); /* Allow gobs of refresh cycles */ + + /** Mode Register initialization **/ + mbar_writeLong(MCFSIM_DACR0, 0x0000b364); /* Enable DACR0[IMRS] (bit 6); RE remains enabled */ + *((volatile unsigned long *) 0x800) = junk; /* Access RAM to initialize the mode register */ + + return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024; +}; + + +int testdram (void) { + /* TODO: XXX XXX XXX */ + printf ("DRAM test not implemented!\n"); + + return (0); +} |