jedec_probe.c

mtd 模块 good for you

		regions: {ERASEINFO(0x10000,15),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x04000,1)
		}
	}, {
		mfr_id: MANUFACTURER_ST,	/* FIXME - CFI device? */
		dev_id: M29W800DB,
		name: "ST M29W800DB",
 		uaddr: {[0] = MTD_UADDR_0x5555_0x2AAA,  /* x8 */
			[1] = MTD_UADDR_0x5555_0x2AAA   /* x16 */
		},
		DevSize: SIZE_1MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x04000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x10000,15)
		}
	}, {
		mfr_id: MANUFACTURER_ST,	/* FIXME - CFI device? */
		dev_id: M29W160DT,
		name: "ST M29W160DT",
		uaddr: {[0] = MTD_UADDR_0x0555_0x02AA,  /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA,  /* x16 */
		},
		DevSize: SIZE_2MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x10000,31),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x04000,1)
		}
	}, {
		mfr_id: MANUFACTURER_ST,	/* FIXME - CFI device? */
		dev_id: M29W160DB,
		name: "ST M29W160DB",
		uaddr: {[0] = MTD_UADDR_0x0555_0x02AA,  /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA,  /* x16 */
		},
		DevSize: SIZE_2MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x04000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x10000,31)
		}
        }, {
		mfr_id: MANUFACTURER_ST,
		dev_id: M29W040B,
		name: "ST M29W040B",
		uaddr: {[0] = MTD_UADDR_0x0555_0x02AA}, /* x8 */
		DevSize: SIZE_512KiB,
		CmdSet: P_ID_AMD_STD,
		NumEraseRegions: 1,
		regions: {ERASEINFO(0x10000,8),
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVT160,
		name: "Toshiba TC58FVT160",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA  /* x16 */
		},
		DevSize: SIZE_2MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x10000,31),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x04000,1)
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVB160,
		name: "Toshiba TC58FVB160",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA  /* x16 */
		},
		DevSize: SIZE_2MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x04000,1),
			  ERASEINFO(0x02000,2),
			  ERASEINFO(0x08000,1),
			  ERASEINFO(0x10000,31)
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVB321,
		name: "Toshiba TC58FVB321",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA  /* x16 */
		},
		DevSize: SIZE_4MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 2,
		regions: {ERASEINFO(0x02000,8),
			  ERASEINFO(0x10000,63)
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVT321,
		name: "Toshiba TC58FVT321",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA  /* x16 */
		},
		DevSize: SIZE_4MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 2,
		regions: {ERASEINFO(0x10000,63),
			  ERASEINFO(0x02000,8)
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVB641,
		name: "Toshiba TC58FVB641",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA, /* x16 */
		},
		DevSize: SIZE_8MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 2,
		regions: {ERASEINFO(0x02000,8),
			  ERASEINFO(0x10000,127)
		}
	}, {
		mfr_id: MANUFACTURER_TOSHIBA,
		dev_id: TC58FVT641,
		name: "Toshiba TC58FVT641",
		uaddr: {[0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
			[1] = MTD_UADDR_0x0555_0x02AA, /* x16 */
		},
		DevSize: SIZE_8MiB,
		CmdSet:	P_ID_AMD_STD,
		NumEraseRegions: 2,
		regions: {ERASEINFO(0x10000,127),
			  ERASEINFO(0x02000,8)
		}
	}, {
		mfr_id: MANUFACTURER_WINBOND,
		dev_id: W49V002A,
		name: "Winbond W49V002A",
		uaddr: {[0] = MTD_UADDR_0x5555_0x2AAA}, /* x8 */
		DevSize: SIZE_256KiB,
		CmdSet: P_ID_AMD_STD,
		NumEraseRegions: 4,
		regions: {ERASEINFO(0x10000, 3),
			  ERASEINFO(0x08000, 1),
			  ERASEINFO(0x02000, 2),
			  ERASEINFO(0x04000, 1),
		}
	} 
};


static int cfi_jedec_setup(struct cfi_private *p_cfi, int index);

static int jedec_probe_chip(struct map_info *map, __u32 base,
			    struct flchip *chips, struct cfi_private *cfi);

struct mtd_info *jedec_probe(struct map_info *map);

static inline u32 jedec_read_mfr(struct map_info *map, __u32 base, 
	struct cfi_private *cfi)
{
	u32 result, mask;
	mask = (1 << (cfi->device_type * 8)) -1;
	result = cfi_read(map, base);
	result &= mask;
	return result;
}

static inline u32 jedec_read_id(struct map_info *map, __u32 base, 
	struct cfi_private *cfi)
{
	int osf;
	u32 result, mask;
	osf = cfi->interleave *cfi->device_type;
	mask = (1 << (cfi->device_type * 8)) -1;
	result = cfi_read(map, base + osf);
	result &= mask;
	return result;
}

static inline void jedec_reset(u32 base, struct map_info *map, 
	struct cfi_private *cfi)
{
	/* Reset */
	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
	/* Some misdesigned intel chips do not respond for 0xF0 for a reset,
	 * so ensure we're in read mode.  Send both the Intel and the AMD command
	 * for this.  Intel uses 0xff for this, AMD uses 0xff for NOP, so
	 * this should be safe.
	 */ 
	cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);

}
static int cfi_jedec_setup(struct cfi_private *p_cfi, int index)
{
	int i,num_erase_regions;

	printk("Found: %s\n",jedec_table[index].name);

	num_erase_regions = jedec_table[index].NumEraseRegions;
	
	p_cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
	if (!p_cfi->cfiq) {
		//xx printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
		return 0;
	}

	memset(p_cfi->cfiq,0,sizeof(struct cfi_ident));	

	p_cfi->cfiq->P_ID = jedec_table[index].CmdSet;
	p_cfi->cfiq->NumEraseRegions = jedec_table[index].NumEraseRegions;
	p_cfi->cfiq->DevSize = jedec_table[index].DevSize;
	p_cfi->cfi_mode = CFI_MODE_JEDEC;

	for (i=0; i<num_erase_regions; i++){
		p_cfi->cfiq->EraseRegionInfo[i] = jedec_table[index].regions[i];
	}
	p_cfi->cmdset_priv = 0;
	return 1; 	/* ok */
}


/*
 * There is a BIG problem properly ID'ing the JEDEC devic and guaranteeing
 * the mapped address, unlock addresses, and proper chip ID.  This function
 * attempts to minimize errors.  It is doubtfull that this probe will ever
 * be perfect - consequently there should be some module parameters that
 * could be manually specified to force the chip info.
 */
static inline int jedec_match( __u32 base,
			       struct map_info *map,
			       struct cfi_private *cfi,
			       const struct amd_flash_info *finfo )
{
	int rc = 0;           /* failure until all tests pass */
	u32 mfr, id;
	__u8 uaddr_idx;
	__u8 uaddr;

	/* The ID's must match */
	if ( cfi->mfr != finfo->mfr_id || cfi->id != finfo->dev_id ) {
		goto match_done;
	}

	/* unlock addresses must match */
	switch ( cfi->device_type ) {
	case CFI_DEVICETYPE_X8:  uaddr_idx = 0; break;
	case CFI_DEVICETYPE_X16: uaddr_idx = 1; break;
	case CFI_DEVICETYPE_X32: uaddr_idx = 2; break;
	default:
		printk(KERN_NOTICE "MTD: %s(): unknown device_type %d\n",
		       __func__, cfi->device_type);
		goto match_done;
	}

	uaddr = finfo->uaddr[uaddr_idx];
	if ( MTD_UADDR_NOT_SUPPORTED ) {
		goto match_done;
	}

	DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): check unlock addrs 0x%.4x 0x%.4x\n",
	       __func__, cfi->addr_unlock1, cfi->addr_unlock2 );
	if ( MTD_UADDR_UNNECESSARY != uaddr && MTD_UADDR_DONT_CARE != uaddr
	     && ( unlock_addrs[uaddr].addr1 != cfi->addr_unlock1
		  || unlock_addrs[uaddr].addr2 != cfi->addr_unlock2 ) ) {
		DEBUG( MTD_DEBUG_LEVEL3,
		       "MTD %s(): 0x%.4x 0x%.4x did not match\n",
		       __func__,
		       unlock_addrs[uaddr].addr1,
		       unlock_addrs[uaddr].addr2 );
		goto match_done;
	}

	/*
	 * Make sure the ID's dissappear when the device is taken out of
	 * ID mode.  The only time this should fail when it should succeed
	 * is when the ID's are written as data to the same
	 * addresses.  For this rare and unfortunate case the chip
	 * cannot be probed correctly.
	 * FIXME - write a driver that takes all of the chip info as
	 * module parameters, doesn't probe but forces a load.
	 */
	DEBUG( MTD_DEBUG_LEVEL3,
	       "MTD %s(): check ID's disappear when not in ID mode\n",
	       __func__ );
	jedec_reset( base, map, cfi );
	mfr = jedec_read_mfr( map, base, cfi );
	id = jedec_read_id( map, base, cfi );
	if ( mfr == cfi->mfr && id == cfi->id ) {
		DEBUG( MTD_DEBUG_LEVEL3,
		       "MTD %s(): ID 0x%.2x:0x%.2x did not change after reset:\n"
		       "You might need to manually specify JEDEC parameters.\n",
			__func__, cfi->mfr, cfi->id );
		goto match_done;
	}

	/* all tests passed - mark  as success */
	rc = 1;

	/*
	 * Put the device back in ID mode - only need to do this if we
	 * were truly frobbing a real device.
	 */
	DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): return to ID mode\n", __func__ );
	if(cfi->addr_unlock1) {
		cfi_send_gen_cmd(0xaa, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
		cfi_send_gen_cmd(0x55, cfi->addr_unlock2, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
	}
	cfi_send_gen_cmd(0x90, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);

 match_done:	
	return rc;
}


static int jedec_probe_chip(struct map_info *map, __u32 base,
			      struct flchip *chips, struct cfi_private *cfi)
{
	int i;
	int unlockpass = 0;

	if (!cfi->numchips) {
		switch (cfi->device_type) {
		case CFI_DEVICETYPE_X8:
			cfi->addr_unlock1 = 0x555;
			cfi->addr_unlock2 = 0x2aa;
			break;
		case CFI_DEVICETYPE_X16:
			cfi->addr_unlock1 = 0xaaa;
			if (map->buswidth == cfi->interleave) {
				/* X16 chip(s) in X8 mode */
				cfi->addr_unlock2 = 0x555;
			} else {
				cfi->addr_unlock2 = 0x554;
			}
			break;
		case CFI_DEVICETYPE_X32:
			cfi->addr_unlock1 = 0x1555; 
			cfi->addr_unlock2 = 0xaaa; 
			break;
		default:
			printk(KERN_NOTICE "Eep. Unknown jedec_probe device type %d\n", cfi->device_type);
		return 0;
		}
	}

 retry:
	/* Make certain we aren't probing past the end of map */
	if (base >= map->size) {
		printk(KERN_NOTICE
			"Probe at base(0x%08x) past the end of the map(0x%08lx)\n",
			base, map->size -1);
		return 0;
		
	}
	if ((base + cfi->addr_unlock1) >= map->size) {
		printk(KERN_NOTICE
			"Probe at addr_unlock1(0x%08x + 0x%08x) past the end of the map(0x%08lx)\n",
			base, cfi->addr_unlock1, map->size -1);

		return 0;
	}
	if ((base + cfi->addr_unlock2) >= map->size) {
		printk(KERN_NOTICE
			"Probe at addr_unlock2(0x%08x + 0x%08x) past the end of the map(0x%08lx)\n",
			base, cfi->addr_unlock2, map->size -1);
		return 0;
		
	}

	/* Reset */
	jedec_reset(base, map, cfi);

	/* Autoselect Mode */
	if(cfi->addr_unlock1) {
		cfi_send_gen_cmd(0xaa, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
		cfi_send_gen_cmd(0x55, cfi->addr_unlock2, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
	}
	cfi_send_gen_cmd(0x90, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);

	if (!cfi->numchips) {
		/* This is the first time we're called. Set up the CFI 
		   stuff accordingly and return */
		
		cfi->mfr = jedec_read_mfr(map, base, cfi);
		cfi->id = jedec_read_id(map, base, cfi);
		printk(KERN_INFO "Search for id:(%02x %02x) interleave(%d) type(%d)\n", 
			cfi->mfr, cfi->id, cfi->interleave, cfi->device_type);
		for (i=0; i<sizeof(jedec_table)/sizeof(jedec_table[0]); i++) {
			if ( jedec_match( base, map, cfi, &jedec_table[i] ) ) {
				DEBUG( MTD_DEBUG_LEVEL3,
				       "MTD %s(): matched device 0x%x,0x%x unlock_addrs: 0x%.4x 0x%.4x\n",
				       __func__, cfi->mfr, cfi->id,
				       cfi->addr_unlock1, cfi->addr_unlock2 );
				if (!cfi_jedec_setup(cfi, i))
					return 0;
				goto ok_out;
			}
		}
		switch(unlockpass++) {
		case 0:
			cfi->addr_unlock1 |= cfi->addr_unlock1 << 4;
			cfi->addr_unlock2 |= cfi->addr_unlock2 << 4;
			goto retry;
		case 1:
			cfi->addr_unlock1 = cfi->addr_unlock2 = 0;
			goto retry;
		}
		return 0;
	} else {
		__u16 mfr;
		__u16 id;

		/* Make sure it is a chip of the same manufacturer and id */
		mfr = jedec_read_mfr(map, base, cfi);
		id = jedec_read_id(map, base, cfi);

		if ((mfr != cfi->mfr) || (id != cfi->id)) {
			printk(KERN_DEBUG "%s: Found different chip or no chip at all (mfr 0x%x, id 0x%x) at 0x%x\n",
			       map->name, mfr, id, base);
			jedec_reset(base, map, cfi);
			return 0;
		}
	}
	
	/* Check each previous chip to see if it's an alias */
	for (i=0; i<cfi->numchips; i++) {
		/* This chip should be in read mode if it's one
		   we've already touched. */
		if (jedec_read_mfr(map, chips[i].start, cfi) == cfi->mfr &&
		    jedec_read_id(map, chips[i].start, cfi) == cfi->id) {
			/* Eep. This chip also looks like it's in autoselect mode.
			   Is it an alias for the new one? */
			jedec_reset(chips[i].start, map, cfi);

			/* If the device IDs go away, it's an alias */
			if (jedec_read_mfr(map, base, cfi) != cfi->mfr ||
			    jedec_read_id(map, base, cfi) != cfi->id) {
				printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
				       map->name, base, chips[i].start);
				return 0;
			}
			
			/* Yes, it's actually got the device IDs as data. Most
			 * unfortunate. Stick the new chip in read mode
			 * too and if it's the same, assume it's an alias. */
			/* FIXME: Use other modes to do a proper check */
			jedec_reset(base, map, cfi);
			if (jedec_read_mfr(map, base, cfi) == cfi->mfr &&
			    jedec_read_id(map, base, cfi) == cfi->id) {
				printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
				       map->name, base, chips[i].start);
				return 0;
			}
		}
	}
		
	/* OK, if we got to here, then none of the previous chips appear to
	   be aliases for the current one. */
	if (cfi->numchips == MAX_CFI_CHIPS) {
		printk(KERN_WARNING"%s: Too many flash chips detected. Increase MAX_CFI_CHIPS from %d.\n", map->name, MAX_CFI_CHIPS);
		/* Doesn't matter about resetting it to Read Mode - we're not going to talk to it anyway */
		return -1;
	}
	chips[cfi->numchips].start = base;
	chips[cfi->numchips].state = FL_READY;
	cfi->numchips++;
		
ok_out:
	/* Put it back into Read Mode */
	jedec_reset(base, map, cfi);

	printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit mode\n",
	       map->name, cfi->interleave, cfi->device_type*8, base, 
	       map->buswidth*8);
	
	return 1;
}

static struct chip_probe jedec_chip_probe = {
	name: "JEDEC",
	probe_chip: jedec_probe_chip
};

struct mtd_info *jedec_probe(struct map_info *map)
{
	/*
	 * Just use the generic probe stuff to call our CFI-specific
	 * chip_probe routine in all the possible permutations, etc.
	 */
	return mtd_do_chip_probe(map, &jedec_chip_probe);
}

static struct mtd_chip_driver jedec_chipdrv = {
	probe: jedec_probe,
	name: "jedec_probe",
	module: THIS_MODULE
};

int __init jedec_probe_init(void)
{
	register_mtd_chip_driver(&jedec_chipdrv);
	return 0;
}

static void __exit jedec_probe_exit(void)
{
	unregister_mtd_chip_driver(&jedec_chipdrv);
}

module_init(jedec_probe_init);
module_exit(jedec_probe_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Erwin Authried <[e-mail]> et al.");
MODULE_DESCRIPTION("Probe code for JEDEC-compliant flash chips");