cfi_cmdset_0001.c

基于linux-2.6.28的mtd驱动

/*
 * Common Flash Interface support:
 *   Intel Extended Vendor Command Set (ID 0x0001)
 *
 * (C) 2000 Red Hat. GPL'd
 *
 *
 * 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
 * 21/03/2007   Rodolfo Giometti <[e-mail]>
 * 	- auto unlock sectors on resume for auto locking flash on power up
 */

#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/reboot.h>
#include <linux/bitmap.h>
#include <linux/mtd/xip.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 */
/* #define CMDSET0001_DISABLE_WRITE_SUSPEND */

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

#define MANUFACTURER_INTEL	0x0089
#define I82802AB	0x00ad
#define I82802AC	0x00ac
#define MANUFACTURER_ST         0x0020
#define M50LPW080       0x002F
#define M50FLW080A	0x0080
#define M50FLW080B	0x0081
#define AT49BV640D	0x02de

static int cfi_intelext_read (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_writev(struct mtd_info *, const struct kvec *, unsigned long, loff_t, size_t *);
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);
#ifdef CONFIG_MTD_OTP
static int cfi_intelext_read_fact_prot_reg (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_write_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_lock_user_prot_reg (struct mtd_info *, loff_t, size_t);
static int cfi_intelext_get_fact_prot_info (struct mtd_info *,
					    struct otp_info *, size_t);
static int cfi_intelext_get_user_prot_info (struct mtd_info *,
					    struct otp_info *, size_t);
#endif
static int cfi_intelext_suspend (struct mtd_info *);
static void cfi_intelext_resume (struct mtd_info *);
static int cfi_intelext_reboot (struct notifier_block *, unsigned long, void *);

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

static int cfi_intelext_point (struct mtd_info *mtd, loff_t from, size_t len,
		     size_t *retlen, void **virt, resource_size_t *phys);
static void cfi_intelext_unpoint(struct mtd_info *mtd, loff_t from, size_t len);

static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long adr, int mode);
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode);
static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr);
#include "fwh_lock.h"



/*
 *  *********** 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("  Extended Query version %c.%c\n", extp->MajorVersion, extp->MinorVersion);
	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");
	printk("     - Extended Flash Array:    %s\n", extp->FeatureSupport&1024?"supported":"unsupported");
	for (i=11; 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("     - Lock-Down Bit Active: %s\n", extp->BlkStatusRegMask&2?"yes":"no");
	for (i=2; i<3; i++) {
		if (extp->BlkStatusRegMask & (1<<i))
			printk("     - Unknown Bit %X Active: yes\n",i);
	}
	printk("     - EFA Lock Bit:         %s\n", extp->BlkStatusRegMask&16?"yes":"no");
	printk("     - EFA Lock-Down Bit:    %s\n", extp->BlkStatusRegMask&32?"yes":"no");
	for (i=6; 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

/* Atmel chips don't use the same PRI format as Intel chips */
static void fixup_convert_atmel_pri(struct mtd_info *mtd, void *param)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_pri_intelext *extp = cfi->cmdset_priv;
	struct cfi_pri_atmel atmel_pri;
	uint32_t features = 0;

	/* Reverse byteswapping */
	extp->FeatureSupport = cpu_to_le32(extp->FeatureSupport);
	extp->BlkStatusRegMask = cpu_to_le16(extp->BlkStatusRegMask);
	extp->ProtRegAddr = cpu_to_le16(extp->ProtRegAddr);

	memcpy(&atmel_pri, extp, sizeof(atmel_pri));
	memset((char *)extp + 5, 0, sizeof(*extp) - 5);

	printk(KERN_ERR "atmel Features: %02x\n", atmel_pri.Features);

	if (atmel_pri.Features & 0x01) /* chip erase supported */
		features |= (1<<0);
	if (atmel_pri.Features & 0x02) /* erase suspend supported */
		features |= (1<<1);
	if (atmel_pri.Features & 0x04) /* program suspend supported */
		features |= (1<<2);
	if (atmel_pri.Features & 0x08) /* simultaneous operations supported */
		features |= (1<<9);
	if (atmel_pri.Features & 0x20) /* page mode read supported */
		features |= (1<<7);
	if (atmel_pri.Features & 0x40) /* queued erase supported */
		features |= (1<<4);
	if (atmel_pri.Features & 0x80) /* Protection bits supported */
		features |= (1<<6);

	extp->FeatureSupport = features;

	/* burst write mode not supported */
	cfi->cfiq->BufWriteTimeoutTyp = 0;
	cfi->cfiq->BufWriteTimeoutMax = 0;
}

#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 mtd_info *mtd, void* param)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_pri_intelext *extp = cfi->cmdset_priv;

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

#ifdef CMDSET0001_DISABLE_WRITE_SUSPEND
static void fixup_no_write_suspend(struct mtd_info *mtd, void* param)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_pri_intelext *cfip = cfi->cmdset_priv;

	if (cfip && (cfip->FeatureSupport&4)) {
		cfip->FeatureSupport &= ~4;
		printk(KERN_WARNING "cfi_cmdset_0001: write suspend disabled\n");
	}
}
#endif

static void fixup_st_m28w320ct(struct mtd_info *mtd, void* param)
{
	struct map_info *map = mtd->priv;
	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 mtd_info *mtd, void* param)
{
	struct map_info *map = mtd->priv;
	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 void fixup_use_point(struct mtd_info *mtd, void *param)
{
	struct map_info *map = mtd->priv;
	if (!mtd->point && map_is_linear(map)) {
		mtd->point   = cfi_intelext_point;
		mtd->unpoint = cfi_intelext_unpoint;
	}
}

static void fixup_use_write_buffers(struct mtd_info *mtd, void *param)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	if (cfi->cfiq->BufWriteTimeoutTyp) {
		printk(KERN_INFO "Using buffer write method\n" );
		mtd->write = cfi_intelext_write_buffers;
		mtd->writev = cfi_intelext_writev;
	}
}

/*
 * Some chips power-up with all sectors locked by default.
 */
static void fixup_unlock_powerup_lock(struct mtd_info *mtd, void *param)
{
	struct map_info *map = mtd->priv;
	struct cfi_private *cfi = map->fldrv_priv;
	struct cfi_pri_intelext *cfip = cfi->cmdset_priv;

	if (cfip->FeatureSupport&32) {
		printk(KERN_INFO "Using auto-unlock on power-up/resume\n" );
		mtd->flags |= MTD_POWERUP_LOCK;
	}
}

static struct cfi_fixup cfi_fixup_table[] = {
	{ CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL },
#ifdef CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE
	{ CFI_MFR_ANY, CFI_ID_ANY, fixup_intel_strataflash, NULL },
#endif
#ifdef CMDSET0001_DISABLE_WRITE_SUSPEND
	{ CFI_MFR_ANY, CFI_ID_ANY, fixup_no_write_suspend, NULL },
#endif
#if !FORCE_WORD_WRITE
	{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL },
#endif
	{ CFI_MFR_ST, 0x00ba, /* M28W320CT */ fixup_st_m28w320ct, NULL },
	{ CFI_MFR_ST, 0x00bb, /* M28W320CB */ fixup_st_m28w320cb, NULL },
	{ MANUFACTURER_INTEL, CFI_ID_ANY, fixup_unlock_powerup_lock, NULL, },
	{ 0, 0, NULL, NULL }
};

static struct cfi_fixup jedec_fixup_table[] = {
	{ MANUFACTURER_INTEL, I82802AB,   fixup_use_fwh_lock, NULL, },
	{ MANUFACTURER_INTEL, I82802AC,   fixup_use_fwh_lock, NULL, },
	{ MANUFACTURER_ST,    M50LPW080,  fixup_use_fwh_lock, NULL, },
	{ MANUFACTURER_ST,    M50FLW080A, fixup_use_fwh_lock, NULL, },
	{ MANUFACTURER_ST,    M50FLW080B, fixup_use_fwh_lock, NULL, },
	{ 0, 0, NULL, NULL }
};
static struct cfi_fixup fixup_table[] = {
	/* The CFI vendor ids and the JEDEC vendor IDs appear
	 * to be common.  It is like the devices id's are as
	 * well.  This table is to pick all cases where
	 * we know that is the case.
	 */
	{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_point, NULL },
	{ 0, 0, NULL, NULL }
};

static inline struct cfi_pri_intelext *
read_pri_intelext(struct map_info *map, __u16 adr)
{
	struct cfi_pri_intelext *extp;
	unsigned int extp_size = sizeof(*extp);

 again:
	extp = (struct cfi_pri_intelext *)cfi_read_pri(map, adr, extp_size, "Intel/Sharp");
	if (!extp)
		return NULL;

	if (extp->MajorVersion != '1' ||
	    (extp->MinorVersion < '0' || extp->MinorVersion > '5')) {
		printk(KERN_ERR "  Unknown Intel/Sharp Extended Query "
		       "version %c.%c.\n",  extp->MajorVersion,
		       extp->MinorVersion);
		kfree(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);

	if (extp->MajorVersion == '1' && extp->MinorVersion >= '3') {
		unsigned int extra_size = 0;
		int nb_parts, i;

		/* Protection Register info */
		extra_size += (extp->NumProtectionFields - 1) *
			      sizeof(struct cfi_intelext_otpinfo);

		/* Burst Read info */
		extra_size += 2;
		if (extp_size < sizeof(*extp) + extra_size)
			goto need_more;
		extra_size += extp->extra[extra_size-1];

		/* Number of hardware-partitions */
		extra_size += 1;
		if (extp_size < sizeof(*extp) + extra_size)
			goto need_more;
		nb_parts = extp->extra[extra_size - 1];

		/* skip the sizeof(partregion) field in CFI 1.4 */
		if (extp->MinorVersion >= '4')
			extra_size += 2;

		for (i = 0; i < nb_parts; i++) {
			struct cfi_intelext_regioninfo *rinfo;
			rinfo = (struct cfi_intelext_regioninfo *)&extp->extra[extra_size];
			extra_size += sizeof(*rinfo);
			if (extp_size < sizeof(*extp) + extra_size)
				goto need_more;
			rinfo->NumIdentPartitions=le16_to_cpu(rinfo->NumIdentPartitions);
			extra_size += (rinfo->NumBlockTypes - 1)
				      * sizeof(struct cfi_intelext_blockinfo);
		}

		if (extp->MinorVersion >= '4')
			extra_size += sizeof(struct cfi_intelext_programming_regioninfo);

		if (extp_size < sizeof(*extp) + extra_size) {
			need_more:
			extp_size = sizeof(*extp) + extra_size;
			kfree(extp);
			if (extp_size > 4096) {
				printk(KERN_ERR
					"%s: cfi_pri_intelext is too fat\n",
					__func__);
				return NULL;
			}
			goto again;
		}
	}

	return extp;
}

struct mtd_info *cfi_cmdset_0001(struct map_info *map, int primary)
{
	struct cfi_private *cfi = map->fldrv_priv;
	struct mtd_info *mtd;
	int i;

	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
	if (!mtd) {
		printk(KERN_ERR "Failed to allocate memory for MTD device\n");
		return NULL;
	}
	mtd->priv = map;
	mtd->type = MTD_NORFLASH;

	/* Fill in the default mtd operations */
	mtd->erase   = cfi_intelext_erase_varsize;
	mtd->read    = cfi_intelext_read;
	mtd->write   = cfi_intelext_write_words;
	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;
	mtd->name    = map->name;
	mtd->writesize = 1;

	mtd->reboot_notifier.notifier_call = cfi_intelext_reboot;

	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 = read_pri_intelext(map, adr);
		if (!extp) {
			kfree(mtd);
			return NULL;
		}

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

		cfi_fixup(mtd, cfi_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");
		}
	}
	else if (cfi->cfi_mode == CFI_MODE_JEDEC) {
		/* Apply jedec specific fixups */