lkml.org 
[lkml]   [2020]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 2/4] mtd: rawnand: Add support Macronix Block Protection function
From
Date

Hi Miquel,

> > +/*
> > + * Macronix NAND supports Block Protection by Protectoin(PT) pin;
> > + * active high at power-on which protects the entire chip even the
#WP is
> > + * disabled. Lock/unlock protection area can be partition according
to
> > + * protection bits, i.e. upper 1/2 locked, upper 1/4 locked and so
on.
> > + */
> > +static int mxic_nand_lock(struct nand_chip *chip, loff_t ofs,
uint64_t len)
> > +{
> > + u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
> > + int ret;
> > +
> > + feature[0] = MXIC_BLOCK_PROTECTION_ALL_LOCK;
> > + nand_select_target(chip, 0);
> > + ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_PROTECTION,
> > + feature);
> > + nand_deselect_target(chip);
> > + if (ret)
> > + pr_err("%s all blocks failed\n", __func__);
> > +
> > + return ret;
> > +}
> > +
> > +static int mxic_nand_unlock(struct nand_chip *chip, loff_t ofs,
uint64_t len)
> > +{
> > + u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
> > + int ret;
> > +
> > + feature[0] = MXIC_BLOCK_PROTECTION_ALL_UNLOCK;
> > + nand_select_target(chip, 0);
> > + ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_PROTECTION,
> > + feature);
> > + nand_deselect_target(chip);
> > + if (ret)
> > + pr_err("%s all blocks failed\n", __func__);
> > +
> > + return ret;
> > }
> >
> > +/*
> > + * Macronix NAND AC series support Block Protection by SET_FEATURES
> > + * to lock/unlock blocks.
> > + */
> > static int macronix_nand_init(struct nand_chip *chip)
> > {
> > + bool blockprotected = false;
> > +
> > if (nand_is_slc(chip))
> > chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
> >
> > - macronix_nand_fix_broken_get_timings(chip);
> > + if (macronix_nand_fix_broken_get_timings(chip))
> > + blockprotected = true;
>
> I don't like this at all :)
>
> Please create a helper which detects which part is broken/protected
> then create helpers to act in this case.

okay, will patch it to read default protected value (after power-on)
for protection function detection.

>
> If the list is absolutely identical, you can share the detection
> helper. Otherwise, if you think the list can diverge, please only share
> the list for now and create two detection helpers.
>
> > +
> > macronix_nand_onfi_init(chip);
> >
> > + if (blockprotected) {
> > + bitmap_set(chip->parameters.set_feature_list,
> > + ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
> > + bitmap_set(chip->parameters.get_feature_list,
> > + ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
> > +
> > + chip->_lock = mxic_nand_lock;
> > + chip->_unlock = mxic_nand_unlock;
> > + }
> > +
> > return 0;
> > }
> >

thanks for your time & comments.
Mason


CONFIDENTIALITY NOTE:

This e-mail and any attachments may contain confidential information
and/or personal data, which is protected by applicable laws. Please be
reminded that duplication, disclosure, distribution, or use of this e-mail
(and/or its attachments) or any part thereof is prohibited. If you receive
this e-mail in error, please notify us immediately and delete this mail as
well as its attachment(s) from your system. In addition, please be
informed that collection, processing, and/or use of personal data is
prohibited unless expressly permitted by personal data protection laws.
Thank you for your attention and cooperation.

Macronix International Co., Ltd.

=====================================================================



============================================================================

CONFIDENTIALITY NOTE:

This e-mail and any attachments may contain confidential information and/or personal data, which is protected by applicable laws. Please be reminded that duplication, disclosure, distribution, or use of this e-mail (and/or its attachments) or any part thereof is prohibited. If you receive this e-mail in error, please notify us immediately and delete this mail as well as its attachment(s) from your system. In addition, please be informed that collection, processing, and/or use of personal data is prohibited unless expressly permitted by personal data protection laws. Thank you for your attention and cooperation.

Macronix International Co., Ltd.

=====================================================================

\
 
 \ /
  Last update: 2020-02-17 09:25    [W:0.066 / U:0.688 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site