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Diffstat (limited to 'arch/ppc/cpu/mpc8220/dramSetup.h')
| -rw-r--r-- | arch/ppc/cpu/mpc8220/dramSetup.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/ppc/cpu/mpc8220/dramSetup.h b/arch/ppc/cpu/mpc8220/dramSetup.h new file mode 100644 index 0000000..3b64e08 --- /dev/null +++ b/arch/ppc/cpu/mpc8220/dramSetup.h @@ -0,0 +1,108 @@ +/* + * dramSetup.h + * + * Prototypes, etc. for the Motorola MPC8220 + * embedded cpu chips + * + * 2004 (c) Freescale, Inc. + * Author: TsiChung Liew <Tsi-Chung.Liew@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 + */ +#ifndef __INCdramsetuph +#define __INCdramsetuph +#ifndef __ASSEMBLY__ +/* Where various things are in the SPD */ +#define LOC_TYPE 2 +#define LOC_CHECKSUM 63 +#define LOC_PHYS_BANKS 5 +#define LOC_LOGICAL_BANKS 17 +#define LOC_ROWS 3 +#define LOC_COLS 4 +#define LOC_WIDTH_HIGH 7 +#define LOC_WIDTH_LOW 6 +#define LOC_REFRESH 12 +#define LOC_BURSTS 16 +#define LOC_CAS 18 +#define LOC_CS 19 +#define LOC_WE 20 +#define LOC_Tcyc 9 +#define LOC_Tac 10 +#define LOC_Trp 27 +#define LOC_Trrd 28 +#define LOC_Trcd 29 +#define LOC_Tras 30 +#define LOC_Buffered 21 +/* Types of memory the SPD can tell us about. + * We can actually only use SDRAM and DDR. + */ +#define TYPE_DRAM 1 /* plain old dram */ +#define TYPE_EDO 2 /* EDO dram */ +#define TYPE_Nibble 3 /* serial nibble memory */ +#define TYPE_SDR 4 /* SDRAM */ +#define TYPE_ROM 5 /* */ +#define TYPE_SGRRAM 6 /* graphics memory */ +#define TYPE_DDR 7 /* DDR sdram */ +#define SDRAMDS_MASK 0x3 /* each field is 2 bits wide */ +#define SDRAMDS_SBE_SHIFT 8 /* Clock enable drive strength */ +#define SDRAMDS_SBC_SHIFT 6 /* Clocks drive strength */ +#define SDRAMDS_SBA_SHIFT 4 /* Address drive strength */ +#define SDRAMDS_SBS_SHIFT 2 /* SDR DQS drive strength */ +#define SDRAMDS_SBD_SHIFT 0 /* Data and DQS drive strength */ +#define DRIVE_STRENGTH_HIGH 0 +#define DRIVE_STRENGTH_MED 1 +#define DRIVE_STRENGTH_LOW 2 +#define DRIVE_STRENGTH_OFF 3 + +#define OK 0 +#define ERROR -1 +/* Structure to hold information about address muxing. */ + typedef struct tagMuxDescriptor { + u8 MuxValue; + u8 Columns; + u8 Rows; + u8 MoreColumns; +} muxdesc_t; + +/* Structure to define one physical bank of + * memory. Note that dram size in bytes is + * (2^^(rows+columns)) * width * banks / 8 +*/ +typedef struct tagDramInfo { + u32 size; /* size in bytes */ + u32 base; /* base address */ + u8 ordinal; /* where in the memory map will we put this */ + u8 type; + u8 rows; + u8 cols; + u16 width; /* width of each chip in bits */ + u8 banks; /* number of chips, aka logical banks */ + u8 bursts; /* bit-encoded allowable burst length */ + u8 CAS; /* bit-encoded CAS latency values */ + u8 CS; /* bit-encoded CS latency values */ + u8 WE; /* bit-encoded WE latency values */ + u8 Trp; /* bit-encoded row precharge time */ + u8 Trcd; /* bit-encoded RAS to CAS delay */ + u8 buffered; /* buffered or not */ + u8 refresh; /* encoded refresh rate */ +} draminfo_t; + +#endif /* __ASSEMBLY__ */ + +#endif /* __INCdramsetuph */ |