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path: root/drivers/mtd/spi-nor/swp.c
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Diffstat (limited to 'drivers/mtd/spi-nor/swp.c')
-rw-r--r--drivers/mtd/spi-nor/swp.c67
1 files changed, 37 insertions, 30 deletions
diff --git a/drivers/mtd/spi-nor/swp.c b/drivers/mtd/spi-nor/swp.c
index 0ba716e84377..9b07f83aeac7 100644
--- a/drivers/mtd/spi-nor/swp.c
+++ b/drivers/mtd/spi-nor/swp.c
@@ -5,6 +5,7 @@
* Copyright (C) 2005, Intec Automation Inc.
* Copyright (C) 2014, Freescale Semiconductor, Inc.
*/
+#include <linux/math64.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/spi-nor.h>
@@ -34,23 +35,27 @@ static u8 spi_nor_get_sr_tb_mask(struct spi_nor *nor)
static u64 spi_nor_get_min_prot_length_sr(struct spi_nor *nor)
{
unsigned int bp_slots, bp_slots_needed;
+ /*
+ * sector_size will eventually be replaced with the max erase size of
+ * the flash. For now, we need to have that ugly default.
+ */
+ unsigned int sector_size = nor->info->sector_size ?: SPI_NOR_DEFAULT_SECTOR_SIZE;
+ u64 n_sectors = div_u64(nor->params->size, sector_size);
u8 mask = spi_nor_get_sr_bp_mask(nor);
/* Reserved one for "protect none" and one for "protect all". */
bp_slots = (1 << hweight8(mask)) - 2;
- bp_slots_needed = ilog2(nor->info->n_sectors);
+ bp_slots_needed = ilog2(n_sectors);
if (bp_slots_needed > bp_slots)
- return nor->info->sector_size <<
- (bp_slots_needed - bp_slots);
+ return sector_size << (bp_slots_needed - bp_slots);
else
- return nor->info->sector_size;
+ return sector_size;
}
static void spi_nor_get_locked_range_sr(struct spi_nor *nor, u8 sr, loff_t *ofs,
- uint64_t *len)
+ u64 *len)
{
- struct mtd_info *mtd = &nor->mtd;
u64 min_prot_len;
u8 mask = spi_nor_get_sr_bp_mask(nor);
u8 tb_mask = spi_nor_get_sr_tb_mask(nor);
@@ -71,13 +76,13 @@ static void spi_nor_get_locked_range_sr(struct spi_nor *nor, u8 sr, loff_t *ofs,
min_prot_len = spi_nor_get_min_prot_length_sr(nor);
*len = min_prot_len << (bp - 1);
- if (*len > mtd->size)
- *len = mtd->size;
+ if (*len > nor->params->size)
+ *len = nor->params->size;
if (nor->flags & SNOR_F_HAS_SR_TB && sr & tb_mask)
*ofs = 0;
else
- *ofs = mtd->size - *len;
+ *ofs = nor->params->size - *len;
}
/*
@@ -85,10 +90,10 @@ static void spi_nor_get_locked_range_sr(struct spi_nor *nor, u8 sr, loff_t *ofs,
* (if @locked is false); false otherwise.
*/
static bool spi_nor_check_lock_status_sr(struct spi_nor *nor, loff_t ofs,
- uint64_t len, u8 sr, bool locked)
+ u64 len, u8 sr, bool locked)
{
loff_t lock_offs, lock_offs_max, offs_max;
- uint64_t lock_len;
+ u64 lock_len;
if (!len)
return true;
@@ -106,14 +111,13 @@ static bool spi_nor_check_lock_status_sr(struct spi_nor *nor, loff_t ofs,
return (ofs >= lock_offs_max) || (offs_max <= lock_offs);
}
-static bool spi_nor_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
- u8 sr)
+static bool spi_nor_is_locked_sr(struct spi_nor *nor, loff_t ofs, u64 len, u8 sr)
{
return spi_nor_check_lock_status_sr(nor, ofs, len, sr, true);
}
-static bool spi_nor_is_unlocked_sr(struct spi_nor *nor, loff_t ofs,
- uint64_t len, u8 sr)
+static bool spi_nor_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, u64 len,
+ u8 sr)
{
return spi_nor_check_lock_status_sr(nor, ofs, len, sr, false);
}
@@ -151,9 +155,8 @@ static bool spi_nor_is_unlocked_sr(struct spi_nor *nor, loff_t ofs,
*
* Returns negative on errors, 0 on success.
*/
-static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, u64 len)
{
- struct mtd_info *mtd = &nor->mtd;
u64 min_prot_len;
int ret, status_old, status_new;
u8 mask = spi_nor_get_sr_bp_mask(nor);
@@ -178,7 +181,7 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
can_be_bottom = false;
/* If anything above us is unlocked, we can't use 'top' protection */
- if (!spi_nor_is_locked_sr(nor, ofs + len, mtd->size - (ofs + len),
+ if (!spi_nor_is_locked_sr(nor, ofs + len, nor->params->size - (ofs + len),
status_old))
can_be_top = false;
@@ -190,11 +193,11 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
/* lock_len: length of region that should end up locked */
if (use_top)
- lock_len = mtd->size - ofs;
+ lock_len = nor->params->size - ofs;
else
lock_len = ofs + len;
- if (lock_len == mtd->size) {
+ if (lock_len == nor->params->size) {
val = mask;
} else {
min_prot_len = spi_nor_get_min_prot_length_sr(nor);
@@ -214,8 +217,13 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
status_new = (status_old & ~mask & ~tb_mask) | val;
- /* Disallow further writes if WP pin is asserted */
- status_new |= SR_SRWD;
+ /*
+ * Disallow further writes if WP# pin is neither left floating nor
+ * wrongly tied to GND (that includes internal pull-downs).
+ * WP# pin hard strapped to GND can be a valid use case.
+ */
+ if (!(nor->flags & SNOR_F_NO_WP))
+ status_new |= SR_SRWD;
if (!use_top)
status_new |= tb_mask;
@@ -236,9 +244,8 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
*
* Returns negative on errors, 0 on success.
*/
-static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, u64 len)
{
- struct mtd_info *mtd = &nor->mtd;
u64 min_prot_len;
int ret, status_old, status_new;
u8 mask = spi_nor_get_sr_bp_mask(nor);
@@ -263,7 +270,7 @@ static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
can_be_top = false;
/* If anything above us is locked, we can't use 'bottom' protection */
- if (!spi_nor_is_unlocked_sr(nor, ofs + len, mtd->size - (ofs + len),
+ if (!spi_nor_is_unlocked_sr(nor, ofs + len, nor->params->size - (ofs + len),
status_old))
can_be_bottom = false;
@@ -275,7 +282,7 @@ static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
/* lock_len: length of region that should remain locked */
if (use_top)
- lock_len = mtd->size - (ofs + len);
+ lock_len = nor->params->size - (ofs + len);
else
lock_len = ofs;
@@ -321,7 +328,7 @@ static int spi_nor_sr_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
* Returns 1 if entire region is locked, 0 if any portion is unlocked, and
* negative on errors.
*/
-static int spi_nor_sr_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
+static int spi_nor_sr_is_locked(struct spi_nor *nor, loff_t ofs, u64 len)
{
int ret;
@@ -343,7 +350,7 @@ void spi_nor_init_default_locking_ops(struct spi_nor *nor)
nor->params->locking_ops = &spi_nor_sr_locking_ops;
}
-static int spi_nor_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+static int spi_nor_lock(struct mtd_info *mtd, loff_t ofs, u64 len)
{
struct spi_nor *nor = mtd_to_spi_nor(mtd);
int ret;
@@ -358,7 +365,7 @@ static int spi_nor_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return ret;
}
-static int spi_nor_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+static int spi_nor_unlock(struct mtd_info *mtd, loff_t ofs, u64 len)
{
struct spi_nor *nor = mtd_to_spi_nor(mtd);
int ret;
@@ -373,7 +380,7 @@ static int spi_nor_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return ret;
}
-static int spi_nor_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+static int spi_nor_is_locked(struct mtd_info *mtd, loff_t ofs, u64 len)
{
struct spi_nor *nor = mtd_to_spi_nor(mtd);
int ret;
generated by cgit (git 2.34.1) at 2025-12-25 17:31:37 +0000