openwrt-xburst/target/linux/brcm-2.4/files/arch/mips/bcm947xx/include/sbsdram.h

/*
 * BCM47XX Sonics SiliconBackplane SDRAM controller core hardware definitions.
 *
 * Copyright 2007, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 * $Id$
 */

#ifndef	_SBSDRAM_H
#define	_SBSDRAM_H

#ifndef _LANGUAGE_ASSEMBLY

/* Sonics side: SDRAM core registers */
typedef volatile struct sbsdramregs {
	uint32	initcontrol;	/* Generates external SDRAM initialization sequence */
	uint32	config;		/* Initializes external SDRAM mode register */
	uint32	refresh;	/* Controls external SDRAM refresh rate */
	uint32	pad1;
	uint32	pad2;
} sbsdramregs_t;

#endif /* !_LANGUAGE_ASSEMBLY */

/* SDRAM initialization control (initcontrol) register bits */
#define SDRAM_CBR	0x0001	/* Writing 1 generates refresh cycle and toggles bit */
#define SDRAM_PRE	0x0002	/* Writing 1 generates precharge cycle and toggles bit */
#define SDRAM_MRS	0x0004	/* Writing 1 generates mode register select cycle and toggles bit */
#define SDRAM_EN	0x0008	/* When set, enables access to SDRAM */
#define SDRAM_16Mb	0x0000	/* Use 16 Megabit SDRAM */
#define SDRAM_64Mb	0x0010	/* Use 64 Megabit SDRAM */
#define SDRAM_128Mb	0x0020	/* Use 128 Megabit SDRAM */
#define SDRAM_RSVMb	0x0030	/* Use special SDRAM */
#define SDRAM_RST	0x0080	/* Writing 1 causes soft reset of controller */
#define SDRAM_SELFREF	0x0100	/* Writing 1 enables self refresh mode */
#define SDRAM_PWRDOWN	0x0200	/* Writing 1 causes controller to power down */
#define SDRAM_32BIT	0x0400	/* When set, indicates 32 bit SDRAM interface */
#define SDRAM_9BITCOL	0x0800	/* When set, indicates 9 bit column */

/* SDRAM configuration (config) register bits */
#define SDRAM_BURSTFULL	0x0000	/* Use full page bursts */
#define SDRAM_BURST8	0x0001	/* Use burst of 8 */
#define SDRAM_BURST4	0x0002	/* Use burst of 4 */
#define SDRAM_BURST2	0x0003	/* Use burst of 2 */
#define SDRAM_CAS3	0x0000	/* Use CAS latency of 3 */
#define SDRAM_CAS2	0x0004	/* Use CAS latency of 2 */

/* SDRAM refresh control (refresh) register bits */
#define SDRAM_REF(p)	(((p)&0xff) | SDRAM_REF_EN)	/* Refresh period */
#define SDRAM_REF_EN	0x8000		/* Writing 1 enables periodic refresh */

/* SDRAM Core default Init values (OCP ID 0x803) */
#define SDRAM_INIT	MEM4MX16X2
#define SDRAM_CONFIG    SDRAM_BURSTFULL
#define SDRAM_REFRESH   SDRAM_REF(0x40)

#define MEM1MX16	0x009	/* 2 MB */
#define MEM1MX16X2	0x409	/* 4 MB */
#define MEM2MX8X2	0x809	/* 4 MB */
#define MEM2MX8X4	0xc09	/* 8 MB */
#define MEM2MX32	0x439	/* 8 MB */
#define MEM4MX16	0x019	/* 8 MB */
#define MEM4MX16X2	0x419	/* 16 MB */
#define MEM8MX8X2	0x819	/* 16 MB */
#define MEM8MX16	0x829	/* 16 MB */
#define MEM4MX32	0x429	/* 16 MB */
#define MEM8MX8X4	0xc19	/* 32 MB */
#define MEM8MX16X2	0xc29	/* 32 MB */

#endif	/* _SBSDRAM_H */