systffs.c

这是micrel公司宽带路由ARM9芯片的VXWORKS BSP 源代码

/* sysTffs.c - ARM integrator TrueFFS Socket Component Driver */

/* Copyright 1984-2002 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01d,13nov01,nrv  made use of PRJ_BUILD
01c,09nov01,nrv  merging in T3 version with some cleanup
01b,14dec00,yp   Documentation cleanup
01a,29nov00,yp   derived from ads860 sysTffs.c 01j.
*/

/*
This stub file provides the user with the means to create a TrueFFS compliant 
socket component driver for use with any BSP. This is sample code and it is
expected, even required, to be modified after it is added to a BSP by the 
project facility when the component INCLUDE_TFFS is added to a kernel project.
Look for #error and TODO statements in the sample code.

This stub does not provides code, just some procedural macros that the
generic driver code will use.

DESCRIPTION
This library must provide board-specific hardware access routines for TrueFFS.
In effect, these routines comprise the socket component driver (or drivers)
for your flash device.  At socket registration time, TrueFFS stores
the functions provided by this socket component driver in an 'FLSocket'
structure.  When TrueFFS needs to access the flash device, it uses these
functions. 
 
Because this file is, for the most part, a device driver that exports its
functionality by registering function pointers with TrueFFS, very few of the
functions defined here are externally callable.  For the record, the only
external functions are flFitInSocketWindow() and flDelayLoop(), and you should
never have to call them.
 
However, one of the most important functions defined in this file is neither
referenced in an 'FLSocket' structure, nor is it externally callable.  This
function is sysTffsInit() and it should only be called by TrueFFS.  TrueFFS 
calls this function at initialization time to register socket component 
drivers for all the flash devices attached to your target.  It is this call 
to sysTffs() that results in assigning drive numbers to the flash devices on 
your target hardware.  Drive numbers are assigned by the order in which the 
socket component drivers are registered. The first to be registered is drive 
0, the second is drive 1, and so on up to 4.  As shipped, TrueFFS supports up 
to five flash drives.
 
After registering socket component drivers for a flash device, you may
format the flash medium even though there is not yet a block device driver
associated with the flash (see the reference entry for the tffsDevCreate()
routine).  To format the flash medium for use with TrueFFS,
call tffsDevFormat() or, for some BSPs, sysTffsFormat().
 
The sysTffsFormat() routine is an optional,BSP-specific helper routine that
can be called externally. Internally, sysTffsFormat() calls tffsDevFormat() 
with a pointer to a 'FormatParams' structure that is initialized to values 
that leave a space on the flash device for a boot image. This space is outside 
the region managed by TrueFFS.  This special region is necessary for boot
images because the normal translation and wear-leveling services of TrueFFS
are incompatible with the needs of the boot program and the boot image it
relies upon.  To write a boot image (or any other data) into this area,
use tffsBootImagePut(). 
 
The function sysTffsFormat() is only provided when a Flash SIMM has to have 
the TrueFFS file system in some desired fraction of it. It is provided only 
for the purpose of simplifying the process of formatting a Flash part that 
that should be subdivided.

The Flash SIMM might also be referred to as RFA (Resident Flash Array) in the 
following text.

Example implentations of sysTffs.c can be found in the directory

    $(WIND_BASE)/target/src/drv/tffs/sockets

The files sds860-sysTffs.c and pc386-sysTffs.c have support for single and dual 
socketed PCMCIA devices as well if that might be useful to you. They both 
support multiple sockets.


Finally, this file also contains define statements for symbolic constants
that determine which MTDs, translation layer modules, and other utilities
are ultimately included in TrueFFS.  These defines are as follows:

.IP "INCLUDE_TL_FTL"
To include the NOR-based translation layer module.
.IP "INCLUDE_TL_SSFDC"
To include the SSFDC-appropriate translation layer module.
.IP "INCLUDE_MTD_I28F016"
For Intel 28f016 flash devices.
.IP "INCLUDE_MTD_I28F008"
For Intel 28f008 flash devices.
.IP "INCLUDE_MTD_I28F008_BAJA"
For Intel 28f008 flash devices on the Heurikon Baja 4700.
.IP "INCLUDE_MTD_AMD"
For AMD, Fujitsu: 29F0{40,80,16} 8-bit flash devices.
.IP "INCLUDE_MTD_CFISCS"
For CFI/SCS flash devices.
.IP "INCLUDE_MTD_WAMD"
For AMD, Fujitsu 29F0{40,80,16} 16-bit flash devices.
.IP "INCLUDE_TFFS_BOOT_IMAGE"
To include tffsBootImagePut() in TrueFFS for Tornado.
.LP
To exclude any of the modules mentioned above, edit sysTffs.c and undefine
its associated symbolic constant.


INCLUDE FILES: flsocket.h, tffsDrv.h
*/
/**
#error "sysTffs : Verify system macros and function before first use"
**/
/* includes */

#include "vxWorks.h"
#include "taskLib.h"
#include "config.h"
#include "tffs/flsocket.h"
#include "tffs/tffsDrv.h"


/* defines */

#ifndef PRJ_BUILD
#undef  INCLUDE_MTD_I28F016             /* Intel: 28f016 */
#undef  INCLUDE_MTD_I28F008             /* Intel: 28f008 */
#undef  INCLUDE_MTD_AMD                 /* AMD, Fujitsu: 29f0{40,80,16} 8bit */
#define INCLUDE_MTD_CFISCS              /* CFI/SCS */
#undef  INCLUDE_MTD_WAMD                /* AMD, Fujitsu: 29f0{40,80,16} 16bit */
#define INCLUDE_TL_FTL                  /* FTL translation layer */
#undef  INCLUDE_TL_SSFDC                /* SSFDC translation layer */
#undef INCLUDE_SOCKET_SIMM             /* SIMM socket interface */
#undef INCLUDE_SOCKET_PCMCIA           /* PCMCIA socket interface */
#endif  /* PRJ_BUILD */

#define INCLUDE_TFFS_BOOT_IMAGE		/* include tffsBootImagePut() */

#define	FLASH_BASE_ADRS		FLASH_BASE	/* Flash memory base address */
#undef FLASH_SIZE
#define	FLASH_SIZE		0x01000000	/* Flash memory size */
#define VCC_DELAY_MSEC		100	/* Millisecs to wait for Vcc ramp up */
#define VPP_DELAY_MSEC		100	/* Millisecs to wait for Vpp ramp up */
#define KILL_TIME_FUNC	 ((iz * iz) / (iz + iz)) / ((iy + iz) / (iy * iz))


/* locals */

LOCAL UINT32 sysTffsMsecLoopCount = 0;


/* forward declarations */

LOCAL FLBoolean		rfaCardDetected (FLSocket vol);
LOCAL void		rfaVccOn (FLSocket vol);
LOCAL void		rfaVccOff (FLSocket vol);
#ifdef	SOCKET_12_VOLTS
LOCAL FLStatus		rfaVppOn (FLSocket vol);
LOCAL void		rfaVppOff (FLSocket vol);
#endif	/* SOCKET_12_VOLTS */
LOCAL FLStatus		rfaInitSocket (FLSocket vol);
LOCAL void		rfaSetWindow (FLSocket vol);
LOCAL void		rfaSetMappingContext (FLSocket vol, unsigned page);
LOCAL FLBoolean		rfaGetAndClearCardChangeIndicator (FLSocket vol);
LOCAL FLBoolean		rfaWriteProtected (FLSocket vol);
LOCAL void		rfaRegister (void);


#ifndef DOC
#include "tffs/tffsConfig.c"
#endif /* DOC */

/*******************************************************************************
*
* sysTffsInit - board level initialization for TFFS
*
* This routine calls the socket registration routines for the socket component
* drivers that will be used with this BSP. The order of registration signifies
* the logical drive number assigned to the drive associated with the socket.
*
* RETURNS: N/A
*/

LOCAL void sysTffsInit (void)
    {
    UINT32 ix = 0;
    UINT32 iy = 1;
    UINT32 iz = 2;
    int oldTick;

    /* by default you can not write to flash so we enable writing now */
    sysFlashWriteEnable();

    /* we assume followings:
     *   - no interrupts except timer is happening.
     *   - the loop count that consumes 1 msec is in 32 bit.
     * it is done in the early stage of usrRoot() in tffsDrv().  */

    oldTick = tickGet();
    while (oldTick == tickGet())	/* wait for next clock interrupt */
	;

    oldTick = tickGet();
    while (oldTick == tickGet())	/* loop one clock tick */
	{
	iy = KILL_TIME_FUNC;		/* consume time */
	ix++;				/* increment the counter */
	}
    
    sysTffsMsecLoopCount = ix * sysClkRateGet() / 1000;

    /* TODO:
     * Call each sockets register routine here
     */

    rfaRegister ();			/* RFA socket interface register */

    }

/*******************************************************************************
*
* rfaRegister - install routines for the Flash RFA
*
* This routine installs necessary functions for the Resident Flash Array(RFA).
*
* RETURNS: N/A
*/

LOCAL void rfaRegister (void)
    {
    FLSocket vol = flSocketOf (noOfDrives);

    tffsSocket[noOfDrives] =	"RFA";
    vol.window.baseAddress =	FLASH_BASE_ADRS >> 12;
    vol.cardDetected =		rfaCardDetected;
    vol.VccOn =			rfaVccOn;
    vol.VccOff =		rfaVccOff;
#ifdef SOCKET_12_VOLTS
    vol.VppOn =			rfaVppOn;
    vol.VppOff =		rfaVppOff;
#endif
    vol.initSocket =		rfaInitSocket;
    vol.setWindow =		rfaSetWindow;
    vol.setMappingContext =	rfaSetMappingContext;
    vol.getAndClearCardChangeIndicator = rfaGetAndClearCardChangeIndicator;
    vol.writeProtected =	rfaWriteProtected;
    noOfDrives++;
    }

/*******************************************************************************
*
* rfaCardDetected - detect if a card is present (inserted)
*
* This routine detects if a card is present (inserted).
* Always return TRUE in RFA environments since device is not removable.
*
* RETURNS: TRUE, or FALSE if the card is not present.
*/

LOCAL FLBoolean rfaCardDetected
    (
    FLSocket vol		/* pointer identifying drive */
    )
    {
    return (TRUE);
    }

/*******************************************************************************
*
* rfaVccOn - turn on Vcc (3.3/5 Volts)
*
* This routine turns on Vcc (3.3/5 Volts).  Vcc must be known to be good
* on exit. Assumed to be ON constantly in RFA environment.
*
* RETURNS: N/A
*/

LOCAL void rfaVccOn
    (
    FLSocket vol		/* pointer identifying drive */
    )
    {
    }

/*******************************************************************************
*
* rfaVccOff - turn off Vcc (3.3/5 Volts)
*
* This routine turns off Vcc (3.3/5 Volts) (PCMCIA). Assumed to be ON