diff options
Diffstat (limited to 'board/freescale/mpc8315erdb/sdram.c')
| -rw-r--r-- | board/freescale/mpc8315erdb/sdram.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/board/freescale/mpc8315erdb/sdram.c b/board/freescale/mpc8315erdb/sdram.c new file mode 100644 index 0000000..f97e3c7 --- /dev/null +++ b/board/freescale/mpc8315erdb/sdram.c @@ -0,0 +1,120 @@ +/* + * Copyright (C) 2007 Freescale Semiconductor, Inc. + * + * Authors: Nick.Spence@freescale.com + * Wilson.Lo@freescale.com + * scottwood@freescale.com + * + * 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 <mpc83xx.h> +#include <spd_sdram.h> + +#include <asm/bitops.h> +#include <asm/io.h> + +#include <asm/processor.h> + +DECLARE_GLOBAL_DATA_PTR; + +static void resume_from_sleep(void) +{ + u32 magic = *(u32 *)0; + + typedef void (*func_t)(void); + func_t resume = *(func_t *)4; + + if (magic == 0xf5153ae5) + resume(); + + gd->flags &= ~GD_FLG_SILENT; + puts("\nResume from sleep failed: bad magic word\n"); +} + +/* Fixed sdram init -- doesn't use serial presence detect. + * + * This is useful for faster booting in configs where the RAM is unlikely + * to be changed, or for things like NAND booting where space is tight. + */ +static long fixed_sdram(void) +{ + volatile immap_t *im = (volatile immap_t *)CFG_IMMR; + u32 msize = CFG_DDR_SIZE * 1024 * 1024; + u32 msize_log2 = __ilog2(msize); + + im->sysconf.ddrlaw[0].bar = CFG_DDR_SDRAM_BASE >> 12; + im->sysconf.ddrlaw[0].ar = LBLAWAR_EN | (msize_log2 - 1); + im->sysconf.ddrcdr = CFG_DDRCDR_VALUE; + + /* + * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg], + * or the DDR2 controller may fail to initialize correctly. + */ + udelay(50000); + + im->ddr.csbnds[0].csbnds = (msize - 1) >> 24; + im->ddr.cs_config[0] = CFG_DDR_CS0_CONFIG; + + /* Currently we use only one CS, so disable the other bank. */ + im->ddr.cs_config[1] = 0; + + im->ddr.sdram_clk_cntl = CFG_DDR_SDRAM_CLK_CNTL; + im->ddr.timing_cfg_3 = CFG_DDR_TIMING_3; + im->ddr.timing_cfg_1 = CFG_DDR_TIMING_1; + im->ddr.timing_cfg_2 = CFG_DDR_TIMING_2; + im->ddr.timing_cfg_0 = CFG_DDR_TIMING_0; + + if (im->pmc.pmccr1 & PMCCR1_POWER_OFF) + im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG | SDRAM_CFG_BI; + else + im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG; + + im->ddr.sdram_cfg2 = CFG_DDR_SDRAM_CFG2; + im->ddr.sdram_mode = CFG_DDR_MODE; + im->ddr.sdram_mode2 = CFG_DDR_MODE2; + + im->ddr.sdram_interval = CFG_DDR_INTERVAL; + sync(); + + /* enable DDR controller */ + im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN; + sync(); + + return msize; +} + +long int initdram(int board_type) +{ + volatile immap_t *im = (volatile immap_t *)CFG_IMMR; + u32 msize; + + if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im) + return -1; + + /* DDR SDRAM */ + msize = fixed_sdram(); + + if (im->pmc.pmccr1 & PMCCR1_POWER_OFF) + resume_from_sleep(); + + /* return total bus SDRAM size(bytes) -- DDR */ + return msize; +} |