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Commit 6db5506f authored by Richard Weinberger's avatar Richard Weinberger
Browse files

Merge tag 'cfi/for-5.4-rc1' of https://github.com/r-vignesh/linux into mtd/for-5.4 

CFI core

* Kill useless initializer in mtd_do_chip_probe()
* Fix a rare write failure seen on some cfi_cmdset_0002 compliant
  Parallel NORs
* Bunch of cleanups for cfi_cmdset_0002 driver's write functions by
  Tokunori Ikegami <ikegami.t@gmail.com>
parents 560852a1 557c7590

drivers/mtd/chips/cfi_cmdset_0002.c

+185 −112
Original line number Diff line number Diff line
@@ -61,7 +61,9 @@ 


static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);

static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);

#if !FORCE_WORD_WRITE

static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);

#endif

static int cfi_amdstd_erase_chip(struct mtd_info *, struct erase_info *);

static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *);

static void cfi_amdstd_sync (struct mtd_info *);
@@ -256,6 +258,7 @@ static void fixup_amd_bootblock(struct mtd_info *mtd) 
}

#endif



#if !FORCE_WORD_WRITE

static void fixup_use_write_buffers(struct mtd_info *mtd)

{

	struct map_info *map = mtd->priv;
@@ -265,6 +268,7 @@ static void fixup_use_write_buffers(struct mtd_info *mtd) 
		mtd->_write = cfi_amdstd_write_buffers;

	}

}

#endif /* !FORCE_WORD_WRITE */



/* Atmel chips don't use the same PRI format as AMD chips */

static void fixup_convert_atmel_pri(struct mtd_info *mtd)
@@ -1637,11 +1641,11 @@ static int cfi_amdstd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, 
				   do_otp_lock, 1);

}



static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,

static int __xipram do_write_oneword_once(struct map_info *map,

					  struct flchip *chip,

					  unsigned long adr, map_word datum,

				     int mode)

					  int mode, struct cfi_private *cfi)

{

	struct cfi_private *cfi = map->fldrv_priv;

	unsigned long timeo = jiffies + HZ;

	/*

	 * We use a 1ms + 1 jiffies generic timeout for writes (most devices
@@ -1654,42 +1658,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, 
	 */

	unsigned long uWriteTimeout = (HZ / 1000) + 1;

	int ret = 0;

	map_word oldd;

	int retry_cnt = 0;



	adr += chip->start;



	mutex_lock(&chip->mutex);

	ret = get_chip(map, chip, adr, mode);

	if (ret) {

		mutex_unlock(&chip->mutex);

		return ret;

	}



	pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",

		 __func__, adr, datum.x[0]);



	if (mode == FL_OTP_WRITE)

		otp_enter(map, chip, adr, map_bankwidth(map));



	/*

	 * Check for a NOP for the case when the datum to write is already

	 * present - it saves time and works around buggy chips that corrupt

	 * data at other locations when 0xff is written to a location that

	 * already contains 0xff.

	 */

	oldd = map_read(map, adr);

	if (map_word_equal(map, oldd, datum)) {

		pr_debug("MTD %s(): NOP\n",

		       __func__);

		goto op_done;

	}



	XIP_INVAL_CACHED_RANGE(map, adr, map_bankwidth(map));

	ENABLE_VPP(map);

	xip_disable(map, chip, adr);



 retry:

	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
@@ -1717,40 +1686,125 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, 
			continue;

		}



		/*

		 * We check "time_after" and "!chip_good" before checking

		 * "chip_good" to avoid the failure due to scheduling.

		 */

		if (time_after(jiffies, timeo) &&

		    !chip_ready(map, chip, adr)) {

		    !chip_good(map, chip, adr, datum)) {

			xip_enable(map, chip, adr);

			printk(KERN_WARNING "MTD %s(): software timeout\n", __func__);

			xip_disable(map, chip, adr);

			ret = -EIO;

			break;

		}



		if (chip_ready(map, chip, adr))

		if (chip_good(map, chip, adr, datum))

			break;



		/* Latency issues. Drop the lock, wait a while and retry */

		UDELAY(map, chip, adr, 1);

	}

	/* Did we succeed? */

	if (!chip_good(map, chip, adr, datum)) {

		/* reset on all failures. */

		cfi_check_err_status(map, chip, adr);

		map_write(map, CMD(0xF0), chip->start);

		/* FIXME - should have reset delay before continuing */



		if (++retry_cnt <= MAX_RETRIES)

			goto retry;

	return ret;

}



		ret = -EIO;

static int __xipram do_write_oneword_start(struct map_info *map,

					   struct flchip *chip,

					   unsigned long adr, int mode)

{

	int ret = 0;



	mutex_lock(&chip->mutex);



	ret = get_chip(map, chip, adr, mode);

	if (ret) {

		mutex_unlock(&chip->mutex);

		return ret;

	}

	xip_enable(map, chip, adr);

 op_done:



	if (mode == FL_OTP_WRITE)

		otp_enter(map, chip, adr, map_bankwidth(map));



	return ret;

}



static void __xipram do_write_oneword_done(struct map_info *map,

					   struct flchip *chip,

					   unsigned long adr, int mode)

{

	if (mode == FL_OTP_WRITE)

		otp_exit(map, chip, adr, map_bankwidth(map));



	chip->state = FL_READY;

	DISABLE_VPP(map);

	put_chip(map, chip, adr);



	mutex_unlock(&chip->mutex);

}



static int __xipram do_write_oneword_retry(struct map_info *map,

					   struct flchip *chip,

					   unsigned long adr, map_word datum,

					   int mode)

{

	struct cfi_private *cfi = map->fldrv_priv;

	int ret = 0;

	map_word oldd;

	int retry_cnt = 0;



	/*

	 * Check for a NOP for the case when the datum to write is already

	 * present - it saves time and works around buggy chips that corrupt

	 * data at other locations when 0xff is written to a location that

	 * already contains 0xff.

	 */

	oldd = map_read(map, adr);

	if (map_word_equal(map, oldd, datum)) {

		pr_debug("MTD %s(): NOP\n", __func__);

		return ret;

	}



	XIP_INVAL_CACHED_RANGE(map, adr, map_bankwidth(map));

	ENABLE_VPP(map);

	xip_disable(map, chip, adr);



 retry:

	ret = do_write_oneword_once(map, chip, adr, datum, mode, cfi);

	if (ret) {

		/* reset on all failures. */

		cfi_check_err_status(map, chip, adr);

		map_write(map, CMD(0xF0), chip->start);

		/* FIXME - should have reset delay before continuing */



		if (++retry_cnt <= MAX_RETRIES) {

			ret = 0;

			goto retry;

		}

	}

	xip_enable(map, chip, adr);



	return ret;

}



static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,

				     unsigned long adr, map_word datum,

				     int mode)

{

	int ret = 0;



	adr += chip->start;



	pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr,

		 datum.x[0]);



	ret = do_write_oneword_start(map, chip, adr, mode);

	if (ret)

		return ret;



	ret = do_write_oneword_retry(map, chip, adr, datum, mode);



	do_write_oneword_done(map, chip, adr, mode);



	return ret;

}
@@ -1879,6 +1933,78 @@ static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len, 
	return 0;

}



#if !FORCE_WORD_WRITE

static int __xipram do_write_buffer_wait(struct map_info *map,

					 struct flchip *chip, unsigned long adr,

					 map_word datum)

{

	unsigned long timeo;

	unsigned long u_write_timeout;

	int ret = 0;



	/*

	 * Timeout is calculated according to CFI data, if available.

	 * See more comments in cfi_cmdset_0002().

	 */

	u_write_timeout = usecs_to_jiffies(chip->buffer_write_time_max);

	timeo = jiffies + u_write_timeout;



	for (;;) {

		if (chip->state != FL_WRITING) {

			/* Someone's suspended the write. Sleep */

			DECLARE_WAITQUEUE(wait, current);



			set_current_state(TASK_UNINTERRUPTIBLE);

			add_wait_queue(&chip->wq, &wait);

			mutex_unlock(&chip->mutex);

			schedule();

			remove_wait_queue(&chip->wq, &wait);

			timeo = jiffies + (HZ / 2); /* FIXME */

			mutex_lock(&chip->mutex);

			continue;

		}



		/*

		 * We check "time_after" and "!chip_good" before checking

		 * "chip_good" to avoid the failure due to scheduling.

		 */

		if (time_after(jiffies, timeo) &&

		    !chip_good(map, chip, adr, datum)) {

			ret = -EIO;

			break;

		}



		if (chip_good(map, chip, adr, datum))

			break;



		/* Latency issues. Drop the lock, wait a while and retry */

		UDELAY(map, chip, adr, 1);

	}



	return ret;

}



static void __xipram do_write_buffer_reset(struct map_info *map,

					   struct flchip *chip,

					   struct cfi_private *cfi)

{

	/*

	 * Recovery from write-buffer programming failures requires

	 * the write-to-buffer-reset sequence.  Since the last part

	 * of the sequence also works as a normal reset, we can run

	 * the same commands regardless of why we are here.

	 * See e.g.

	 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf

	 */

	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,

			 cfi->device_type, NULL);

	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,

			 cfi->device_type, NULL);

	cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,

			 cfi->device_type, NULL);



	/* FIXME - should have reset delay before continuing */

}



/*

 * FIXME: interleaved mode not tested, and probably not supported!
@@ -1888,13 +2014,6 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, 
				    int len)

{

	struct cfi_private *cfi = map->fldrv_priv;

	unsigned long timeo = jiffies + HZ;

	/*

	 * Timeout is calculated according to CFI data, if available.

	 * See more comments in cfi_cmdset_0002().

	 */

	unsigned long uWriteTimeout =

				usecs_to_jiffies(chip->buffer_write_time_max);

	int ret = -EIO;

	unsigned long cmd_adr;

	int z, words;
@@ -1951,63 +2070,16 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, 
				adr, map_bankwidth(map),

				chip->word_write_time);



	timeo = jiffies + uWriteTimeout;



	for (;;) {

		if (chip->state != FL_WRITING) {

			/* Someone's suspended the write. Sleep */

			DECLARE_WAITQUEUE(wait, current);



			set_current_state(TASK_UNINTERRUPTIBLE);

			add_wait_queue(&chip->wq, &wait);

			mutex_unlock(&chip->mutex);

			schedule();

			remove_wait_queue(&chip->wq, &wait);

			timeo = jiffies + (HZ / 2); /* FIXME */

			mutex_lock(&chip->mutex);

			continue;

		}



		/*

		 * We check "time_after" and "!chip_good" before checking "chip_good" to avoid

		 * the failure due to scheduling.

		 */

		if (time_after(jiffies, timeo) &&

		    !chip_good(map, chip, adr, datum))

			break;



		if (chip_good(map, chip, adr, datum)) {

			xip_enable(map, chip, adr);

			goto op_done;

		}



		/* Latency issues. Drop the lock, wait a while and retry */

		UDELAY(map, chip, adr, 1);

	ret = do_write_buffer_wait(map, chip, adr, datum);

	if (ret) {

		cfi_check_err_status(map, chip, adr);

		do_write_buffer_reset(map, chip, cfi);

		pr_err("MTD %s(): software timeout, address:0x%.8lx.\n",

		       __func__, adr);

	}



	/*

	 * Recovery from write-buffer programming failures requires

	 * the write-to-buffer-reset sequence.  Since the last part

	 * of the sequence also works as a normal reset, we can run

	 * the same commands regardless of why we are here.

	 * See e.g.

	 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf

	 */

	cfi_check_err_status(map, chip, adr);

	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,

			 cfi->device_type, NULL);

	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,

			 cfi->device_type, NULL);

	cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,

			 cfi->device_type, NULL);

	xip_enable(map, chip, adr);

	/* FIXME - should have reset delay before continuing */



	printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",

	       __func__, adr);



	ret = -EIO;

 op_done:

	chip->state = FL_READY;

	DISABLE_VPP(map);

	put_chip(map, chip, adr);
@@ -2091,6 +2163,7 @@ static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len, 


	return 0;

}

#endif /* !FORCE_WORD_WRITE */



/*

 * Wait for the flash chip to become ready to write data

drivers/mtd/chips/gen_probe.c

+1 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp, 


struct mtd_info *mtd_do_chip_probe(struct map_info *map, struct chip_probe *cp)

{

	struct mtd_info *mtd = NULL;

	struct mtd_info *mtd;

	struct cfi_private *cfi;



	/* First probe the map to see if we have CFI stuff there. */