cfi_cmdset_0001.c

ARMer9 s3c2410开发系统 mtd文件系统的源代码

/*
 * Common Flash Interface support:
 *   Intel Extended Vendor Command Set (ID 0x0001)
 *
 * (C) 2000 Red Hat. GPL'd
 *
 * $Id: cfi_cmdset_0001.c,v 1.153 2004/07/12 21:52:20 dwmw2 Exp $
 *
 * 
 * 10/10/2000	Nicolas Pitre <[e-mail]>
 * 	- completely revamped method functions so they are aware and
 * 	  independent of the flash geometry (buswidth, interleave, etc.)
 * 	- scalability vs code size is completely set at compile-time
 * 	  (see include/linux/mtd/cfi.h for selection)
 *	- optimized write buffer method
 * 02/05/2002	Christopher Hoover <[e-mail]>/<[e-mail]>
 *	- reworked lock/unlock/erase support for var size flash
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/byteorder.h>

#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/cfi.h>

/* #define CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE */

// debugging, turns off buffer write mode if set to 1
#define FORCE_WORD_WRITE 0

static int cfi_intelext_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
//static int cfi_intelext_read_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
//static int cfi_intelext_read_fact_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_erase_varsize(struct mtd_info *, struct erase_info *);
static void cfi_intelext_sync (struct mtd_info *);
static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, size_t len);
static int cfi_intelext_suspend (struct mtd_info *);
static void cfi_intelext_resume (struct mtd_info *);

static void cfi_intelext_destroy(struct mtd_info *);

struct mtd_info *cfi_cmdset_0001(struct map_info *, int);

static struct mtd_info *cfi_intelext_setup (struct map_info *);
static int cfi_intelext_partition_fixup(struct map_info *, struct cfi_private **);

static int cfi_intelext_point (struct mtd_info *mtd, loff_t from, size_t len,
		     size_t *retlen, u_char **mtdbuf);
static void cfi_intelext_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from,
			size_t len);


/*
 *  *********** SETUP AND PROBE BITS  ***********
 */

static struct mtd_chip_driver cfi_intelext_chipdrv = {
	.probe		= NULL, /* Not usable directly */
	.destroy	= cfi_intelext_destroy,
	.name		= "cfi_cmdset_0001",
	.module		= THIS_MODULE
};

/* #define DEBUG_LOCK_BITS */
/* #define DEBUG_CFI_FEATURES */

#ifdef DEBUG_CFI_FEATURES
static void cfi_tell_features(struct cfi_pri_intelext *extp)
{
	int i;
	printk("  Feature/Command Support:      %4.4X\n", extp->FeatureSupport);
	printk("     - Chip Erase:              %s\n", extp->FeatureSupport&1?"supported":"unsupported");
	printk("     - Suspend Erase:           %s\n", extp->FeatureSupport&2?"supported":"unsupported");
	printk("     - Suspend Program:         %s\n", extp->FeatureSupport&4?"supported":"unsupported");
	printk("     - Legacy Lock/Unlock:      %s\n", extp->FeatureSupport&8?"supported":"unsupported");
	printk("     - Queued Erase:            %s\n", extp->FeatureSupport&16?"supported":"unsupported");
	printk("     - Instant block lock:      %s\n", extp->FeatureSupport&32?"supported":"unsupported");
	printk("     - Protection Bits:         %s\n", extp->FeatureSupport&64?"supported":"unsupported");
	printk("     - Page-mode read:          %s\n", extp->FeatureSupport&128?"supported":"unsupported");
	printk("     - Synchronous read:        %s\n", extp->FeatureSupport&256?"supported":"unsupported");
	printk("     - Simultaneous operations: %s\n", extp->FeatureSupport&512?"supported":"unsupported");
	for (i=10; i<32; i++) {
		if (extp->FeatureSupport & (1<<i)) 
			printk("     - Unknown Bit %X:      supported\n", i);
	}
	
	printk("  Supported functions after Suspend: %2.2X\n", extp->SuspendCmdSupport);
	printk("     - Program after Erase Suspend: %s\n", extp->SuspendCmdSupport&1?"supported":"unsupported");
	for (i=1; i<8; i++) {
		if (extp->SuspendCmdSupport & (1<<i))
			printk("     - Unknown Bit %X:               supported\n", i);
	}
	
	printk("  Block Status Register Mask: %4.4X\n", extp->BlkStatusRegMask);
	printk("     - Lock Bit Active:      %s\n", extp->BlkStatusRegMask&1?"yes":"no");
	printk("     - Valid Bit Active:     %s\n", extp->BlkStatusRegMask&2?"yes":"no");
	for (i=2; i<16; i++) {
		if (extp->BlkStatusRegMask & (1<<i))
			printk("     - Unknown Bit %X Active: yes\n",i);
	}
	
	printk("  Vcc Logic Supply Optimum Program/Erase Voltage: %d.%d V\n", 
	       extp->VccOptimal >> 4, extp->VccOptimal & 0xf);
	if (extp->VppOptimal)
		printk("  Vpp Programming Supply Optimum Program/Erase Voltage: %d.%d V\n", 
		       extp->VppOptimal >> 4, extp->VppOptimal & 0xf);
}
#endif

#ifdef CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE
/* Some Intel Strata Flash prior to FPO revision C has bugs in this area */ 
static void fixup_intel_strataflash(struct map_info *map, void* param)
{
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_pri_amdstd *extp = cfi->cmdset_priv;

	printk(KERN_WARNING "cfi_cmdset_0001: Suspend "
	                    "erase on write disabled.\n");
	extp->SuspendCmdSupport &= ~1;
}
#endif

static void fixup_st_m28w320ct(struct map_info *map, void* param)
{
	struct cfi_private *cfi = map->fldrv_priv;
	
	cfi->cfiq->BufWriteTimeoutTyp = 0;	/* Not supported */
	cfi->cfiq->BufWriteTimeoutMax = 0;	/* Not supported */
}

static void fixup_st_m28w320cb(struct map_info *map, void* param)
{
	struct cfi_private *cfi = map->fldrv_priv;
	
	/* Note this is done after the region info is endian swapped */
	cfi->cfiq->EraseRegionInfo[1] =
		(cfi->cfiq->EraseRegionInfo[1] & 0xffff0000) | 0x3e;
};

static struct cfi_fixup fixup_table[] = {
#ifdef CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE
	{
		CFI_MFR_ANY, CFI_ID_ANY,
		fixup_intel_strataflash, NULL
	}, 
#endif
	{
		0x0020,	/* STMicroelectronics */
		0x00ba,	/* M28W320CT */
		fixup_st_m28w320ct, NULL
	}, {
		0x0020,	/* STMicroelectronics */
		0x00bb,	/* M28W320CB */
		fixup_st_m28w320cb, NULL
	}, {
		0, 0, NULL, NULL
	}
};

/* This routine is made available to other mtd code via
 * inter_module_register.  It must only be accessed through
 * inter_module_get which will bump the use count of this module.  The
 * addresses passed back in cfi are valid as long as the use count of
 * this module is non-zero, i.e. between inter_module_get and
 * inter_module_put.  Keith Owens <[e-mail]> 29 Oct 2000.
 */
struct mtd_info *cfi_cmdset_0001(struct map_info *map, int primary)
{
	struct cfi_private *cfi = map->fldrv_priv;
	int i;

	if (cfi->cfi_mode == CFI_MODE_CFI) {
		/* 
		 * It's a real CFI chip, not one for which the probe
		 * routine faked a CFI structure. So we read the feature
		 * table from it.
		 */
		__u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
		struct cfi_pri_intelext *extp;

		extp = (struct cfi_pri_intelext*)cfi_read_pri(map, adr, sizeof(*extp), "Intel/Sharp");
		if (!extp)
			return NULL;
		
		/* Do some byteswapping if necessary */
		extp->FeatureSupport = le32_to_cpu(extp->FeatureSupport);
		extp->BlkStatusRegMask = le16_to_cpu(extp->BlkStatusRegMask);
		extp->ProtRegAddr = le16_to_cpu(extp->ProtRegAddr);

		/* Install our own private info structure */
		cfi->cmdset_priv = extp;	

		cfi_fixup(map, fixup_table);
			
#ifdef DEBUG_CFI_FEATURES
		/* Tell the user about it in lots of lovely detail */
		cfi_tell_features(extp);
#endif	

		if(extp->SuspendCmdSupport & 1) {
			printk(KERN_NOTICE "cfi_cmdset_0001: Erase suspend on write enabled\n");
		}
	}

	for (i=0; i< cfi->numchips; i++) {
		cfi->chips[i].word_write_time = 1<<cfi->cfiq->WordWriteTimeoutTyp;
		cfi->chips[i].buffer_write_time = 1<<cfi->cfiq->BufWriteTimeoutTyp;
		cfi->chips[i].erase_time = 1<<cfi->cfiq->BlockEraseTimeoutTyp;
		cfi->chips[i].ref_point_counter = 0;
	}		

	map->fldrv = &cfi_intelext_chipdrv;
	
	return cfi_intelext_setup(map);
}

static struct mtd_info *cfi_intelext_setup(struct map_info *map)
{
	struct cfi_private *cfi = map->fldrv_priv;
	struct mtd_info *mtd;
	unsigned long offset = 0;
	int i,j;
	unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;

	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
	//printk(KERN_DEBUG "number of CFI chips: %d\n", cfi->numchips);

	if (!mtd) {
		printk(KERN_ERR "Failed to allocate memory for MTD device\n");
		goto setup_err;
	}

	memset(mtd, 0, sizeof(*mtd));
	mtd->priv = map;
	mtd->type = MTD_NORFLASH;
	mtd->size = devsize * cfi->numchips;

	mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
	mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info) 
			* mtd->numeraseregions, GFP_KERNEL);
	if (!mtd->eraseregions) { 
		printk(KERN_ERR "Failed to allocate memory for MTD erase region info\n");
		goto setup_err;
	}
	
	for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
		unsigned long ernum, ersize;
		ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
		ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;

		if (mtd->erasesize < ersize) {
			mtd->erasesize = ersize;
		}
		for (j=0; j<cfi->numchips; j++) {
			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
		}
		offset += (ersize * ernum);
	}

	if (offset != devsize) {
		/* Argh */
		printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
		goto setup_err;
	}

	for (i=0; i<mtd->numeraseregions;i++){
		printk(KERN_DEBUG "%d: offset=0x%x,size=0x%x,blocks=%d\n",
		       i,mtd->eraseregions[i].offset,
		       mtd->eraseregions[i].erasesize,
		       mtd->eraseregions[i].numblocks);
	}

	/* Also select the correct geometry setup too */ 
	mtd->erase = cfi_intelext_erase_varsize;
	mtd->read = cfi_intelext_read;

	if (map_is_linear(map)) {
		mtd->point = cfi_intelext_point;
		mtd->unpoint = cfi_intelext_unpoint;
	}

	if ( cfi->cfiq->BufWriteTimeoutTyp && !FORCE_WORD_WRITE) {
		printk(KERN_INFO "Using buffer write method\n" );
		mtd->write = cfi_intelext_write_buffers;
	} else {
		printk(KERN_INFO "Using word write method\n" );
		mtd->write = cfi_intelext_write_words;
	}
#if 0
	mtd->read_user_prot_reg = cfi_intelext_read_user_prot_reg;
	mtd->read_fact_prot_reg = cfi_intelext_read_fact_prot_reg;
#endif
	mtd->sync = cfi_intelext_sync;
	mtd->lock = cfi_intelext_lock;
	mtd->unlock = cfi_intelext_unlock;
	mtd->suspend = cfi_intelext_suspend;
	mtd->resume = cfi_intelext_resume;
	mtd->flags = MTD_CAP_NORFLASH;
	map->fldrv = &cfi_intelext_chipdrv;
	mtd->name = map->name;

	/* This function has the potential to distort the reality
	   a bit and therefore should be called last. */
	if (cfi_intelext_partition_fixup(map, &cfi) != 0)
		goto setup_err;

	__module_get(THIS_MODULE);
	return mtd;

 setup_err:
	if(mtd) {
		if(mtd->eraseregions)
			kfree(mtd->eraseregions);
		kfree(mtd);
	}
	kfree(cfi->cmdset_priv);
	return NULL;
}

static int cfi_intelext_partition_fixup(struct map_info *map,
					struct cfi_private **pcfi)
{
	struct cfi_private *cfi = *pcfi;
	struct cfi_pri_intelext *extp = cfi->cmdset_priv;

	/*
	 * Probing of multi-partition flash ships.
	 *
	 * This is extremely crude at the moment and should probably be
	 * extracted entirely from the Intel extended query data instead.
	 * Right now a L18 flash is assumed if multiple operations is
	 * detected.
	 *
	 * To support multiple partitions when available, we simply arrange
	 * for each of them to have their own flchip structure even if they
	 * are on the same physical chip.  This means completely recreating
	 * a new cfi_private structure right here which is a blatent code
	 * layering violation, but this is still the least intrusive
	 * arrangement at this point. This can be rearranged in the future
	 * if someone feels motivated enough.  --nico
	 */
	if (extp && extp->FeatureSupport & (1 << 9)) {
		struct cfi_private *newcfi;
		struct flchip *chip;
		struct flchip_shared *shared;
		int numparts, partshift, numvirtchips, i, j;

		/*
		 * The L18 flash memory array is divided
		 * into multiple 8-Mbit partitions.
		 */
		numparts = 1 << (cfi->cfiq->DevSize - 20);
		partshift = 20 + __ffs(cfi->interleave);
		numvirtchips = cfi->numchips * numparts;