mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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76 lines
3.0 KiB
C
76 lines
3.0 KiB
C
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/*
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* BCM47XX Sonics SiliconBackplane SDRAM controller core hardware definitions.
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*
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* Copyright 2004, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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* $Id$
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*/
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#ifndef _SBSDRAM_H
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#define _SBSDRAM_H
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#ifndef _LANGUAGE_ASSEMBLY
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/* Sonics side: SDRAM core registers */
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typedef volatile struct sbsdramregs {
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uint32 initcontrol; /* Generates external SDRAM initialization sequence */
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uint32 config; /* Initializes external SDRAM mode register */
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uint32 refresh; /* Controls external SDRAM refresh rate */
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uint32 pad1;
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uint32 pad2;
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} sbsdramregs_t;
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#endif
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/* SDRAM initialization control (initcontrol) register bits */
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#define SDRAM_CBR 0x0001 /* Writing 1 generates refresh cycle and toggles bit */
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#define SDRAM_PRE 0x0002 /* Writing 1 generates precharge cycle and toggles bit */
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#define SDRAM_MRS 0x0004 /* Writing 1 generates mode register select cycle and toggles bit */
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#define SDRAM_EN 0x0008 /* When set, enables access to SDRAM */
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#define SDRAM_16Mb 0x0000 /* Use 16 Megabit SDRAM */
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#define SDRAM_64Mb 0x0010 /* Use 64 Megabit SDRAM */
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#define SDRAM_128Mb 0x0020 /* Use 128 Megabit SDRAM */
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#define SDRAM_RSVMb 0x0030 /* Use special SDRAM */
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#define SDRAM_RST 0x0080 /* Writing 1 causes soft reset of controller */
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#define SDRAM_SELFREF 0x0100 /* Writing 1 enables self refresh mode */
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#define SDRAM_PWRDOWN 0x0200 /* Writing 1 causes controller to power down */
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#define SDRAM_32BIT 0x0400 /* When set, indicates 32 bit SDRAM interface */
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#define SDRAM_9BITCOL 0x0800 /* When set, indicates 9 bit column */
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/* SDRAM configuration (config) register bits */
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#define SDRAM_BURSTFULL 0x0000 /* Use full page bursts */
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#define SDRAM_BURST8 0x0001 /* Use burst of 8 */
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#define SDRAM_BURST4 0x0002 /* Use burst of 4 */
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#define SDRAM_BURST2 0x0003 /* Use burst of 2 */
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#define SDRAM_CAS3 0x0000 /* Use CAS latency of 3 */
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#define SDRAM_CAS2 0x0004 /* Use CAS latency of 2 */
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/* SDRAM refresh control (refresh) register bits */
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#define SDRAM_REF(p) (((p)&0xff) | SDRAM_REF_EN) /* Refresh period */
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#define SDRAM_REF_EN 0x8000 /* Writing 1 enables periodic refresh */
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/* SDRAM Core default Init values (OCP ID 0x803) */
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#define SDRAM_INIT MEM4MX16X2
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#define SDRAM_CONFIG SDRAM_BURSTFULL
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#define SDRAM_REFRESH SDRAM_REF(0x40)
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#define MEM1MX16 0x009 /* 2 MB */
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#define MEM1MX16X2 0x409 /* 4 MB */
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#define MEM2MX8X2 0x809 /* 4 MB */
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#define MEM2MX8X4 0xc09 /* 8 MB */
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#define MEM2MX32 0x439 /* 8 MB */
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#define MEM4MX16 0x019 /* 8 MB */
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#define MEM4MX16X2 0x419 /* 16 MB */
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#define MEM8MX8X2 0x819 /* 16 MB */
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#define MEM8MX16 0x829 /* 16 MB */
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#define MEM4MX32 0x429 /* 16 MB */
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#define MEM8MX8X4 0xc19 /* 32 MB */
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#define MEM8MX16X2 0xc29 /* 32 MB */
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#endif /* _SBSDRAM_H */
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