arch/arm/plat-omap/include/mach/sdrc.h

#ifndef ____ASM_ARCH_SDRC_H
#define ____ASM_ARCH_SDRC_H

/*
 * OMAP2/3 SDRC/SMS register definitions
 *
 * Copyright (C) 2007-2008 Texas Instruments, Inc.
 * Copyright (C) 2007-2008 Nokia Corporation
 *
 * Tony Lindgren
 * Paul Walmsley
 * Richard Woodruff
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <mach/io.h>

/* SDRC register offsets - read/write with sdrc_{read,write}_reg() */

#define SDRC_SYSCONFIG		0x010
#define SDRC_DLLA_CTRL		0x060
#define SDRC_DLLA_STATUS	0x064
#define SDRC_DLLB_CTRL		0x068
#define SDRC_DLLB_STATUS	0x06C
#define SDRC_POWER		0x070
#define SDRC_MR_0		0x084
#define SDRC_ACTIM_CTRL_A_0	0x09c
#define SDRC_ACTIM_CTRL_B_0	0x0a0
#define SDRC_RFR_CTRL_0		0x0a4

/*
 * These values represent the number of memory clock cycles between
 * autorefresh initiation.  They assume 1 refresh per 64 ms (JEDEC), 8192
 * rows per device, and include a subtraction of a 50 cycle window in the
 * event that the autorefresh command is delayed due to other SDRC activity.
 * The '| 1' sets the ARE field to send one autorefresh when the autorefresh
 * counter reaches 0.
 *
 * These represent optimal values for common parts, it won't work for all.
 * As long as you scale down, most parameters are still work, they just
 * become sub-optimal. The RFR value goes in the opposite direction. If you
 * don't adjust it down as your clock period increases the refresh interval
 * will not be met. Setting all parameters for complete worst case may work,
 * but may cut memory performance by 2x. Due to errata the DLLs need to be
 * unlocked and their value needs run time calibration.	A dynamic call is
 * need for that as no single right value exists acorss production samples.
 *
 * Only the FULL speed values are given. Current code is such that rate
 * changes must be made at DPLLoutx2. The actual value adjustment for low
 * frequency operation will be handled by omap_set_performance()
 *
 * By having the boot loader boot up in the fastest L4 speed available likely
 * will result in something which you can switch between.
 */
#define SDRC_RFR_CTRL_165MHz	(0x00044c00 | 1)
#define SDRC_RFR_CTRL_133MHz	(0x0003de00 | 1)
#define SDRC_RFR_CTRL_100MHz	(0x0002da01 | 1)
#define SDRC_RFR_CTRL_110MHz	(0x0002da01 | 1) /* Need to calc */
#define SDRC_RFR_CTRL_BYPASS	(0x00005000 | 1) /* Need to calc */


/*
 * SMS register access
 */

#define OMAP242X_SMS_REGADDR(reg)					\
			(void __iomem *)IO_ADDRESS(OMAP2420_SMS_BASE + reg)
#define OMAP243X_SMS_REGADDR(reg)					\
			(void __iomem *)IO_ADDRESS(OMAP243X_SMS_BASE + reg)
#define OMAP343X_SMS_REGADDR(reg)					\
			(void __iomem *)IO_ADDRESS(OMAP343X_SMS_BASE + reg)

/* SMS register offsets - read/write with sms_{read,write}_reg() */

#define SMS_SYSCONFIG		0x010
/* REVISIT: fill in other SMS registers here */


#ifndef __ASSEMBLER__

/**
 * struct omap_sdrc_params - SDRC parameters for a given SDRC clock rate
 * @rate: SDRC clock rate (in Hz)
 * @actim_ctrla: Value to program to SDRC_ACTIM_CTRLA for this rate
 * @actim_ctrlb: Value to program to SDRC_ACTIM_CTRLB for this rate
 * @rfr_ctrl: Value to program to SDRC_RFR_CTRL for this rate
 * @mr: Value to program to SDRC_MR for this rate
 *
 * This structure holds a pre-computed set of register values for the
 * SDRC for a given SDRC clock rate and SDRAM chip.  These are
 * intended to be pre-computed and specified in an array in the board-*.c
 * files.  The structure is keyed off the 'rate' field.
 */
struct omap_sdrc_params {
	unsigned long rate;
	u32 actim_ctrla;
	u32 actim_ctrlb;
	u32 rfr_ctrl;
	u32 mr;
};

void __init omap2_sdrc_init(struct omap_sdrc_params *sp);
struct omap_sdrc_params *omap2_sdrc_get_params(unsigned long r);

#ifdef CONFIG_ARCH_OMAP2

struct memory_timings {
	u32 m_type;		/* ddr = 1, sdr = 0 */
	u32 dll_mode;		/* use lock mode = 1, unlock mode = 0 */
	u32 slow_dll_ctrl;	/* unlock mode, dll value for slow speed */
	u32 fast_dll_ctrl;	/* unlock mode, dll value for fast speed */
	u32 base_cs;		/* base chip select to use for calculations */
};

extern void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode);

u32 omap2xxx_sdrc_dll_is_unlocked(void);
u32 omap2xxx_sdrc_reprogram(u32 level, u32 force);

#endif  /* CONFIG_ARCH_OMAP2 */

#endif  /* __ASSEMBLER__ */

#endif