[PATCH] sf: Drop spl_flash_get_sw_write_prot

Jagan Teki jagan at amarulasolutions.com
Thu May 14 14:50:56 CEST 2020


The get_sw_write_prot API is used to get the write-protected
bits of flash by reading the status register and other wards
it's API for reading register bits.

1) This kind of requirement can be achieved using existing
   flash operations and flash locking API calls instead of
   making a separate flash API.
2) Technically there is no real hardware user for this API to
   use in the source tree.
3) Having a flash operations API for simple register read bits
   also make difficult to extend the flash operations.
4) Instead of touching generic code, it is possible to have
   this functionality inside spinor operations in the form of
   flash hooks or fixups for associated flash chips.

Considering all these points, this patch drops the get_sw_write_prot
and associated code bases.

Cc: Simon Glass <sjg at chromium.org>
Cc: Vignesh R <vigneshr at ti.com>
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
 drivers/mtd/spi/sf-uclass.c    |  9 ---------
 drivers/mtd/spi/sf_internal.h  |  4 ----
 drivers/mtd/spi/sf_probe.c     |  8 --------
 drivers/mtd/spi/spi-nor-core.c | 11 -----------
 drivers/mtd/spi/spi-nor-tiny.c |  6 ------
 include/spi_flash.h            | 27 ---------------------------
 test/dm/sf.c                   |  8 --------
 7 files changed, 73 deletions(-)

diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c
index 5ebcca590a..5a42ab83c8 100644
--- a/drivers/mtd/spi/sf-uclass.c
+++ b/drivers/mtd/spi/sf-uclass.c
@@ -29,15 +29,6 @@ int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len)
 	return log_ret(sf_get_ops(dev)->erase(dev, offset, len));
 }
 
-int spl_flash_get_sw_write_prot(struct udevice *dev)
-{
-	struct dm_spi_flash_ops *ops = sf_get_ops(dev);
-
-	if (!ops->get_sw_write_prot)
-		return -ENOSYS;
-	return log_ret(ops->get_sw_write_prot(dev));
-}
-
 /*
  * TODO(sjg at chromium.org): This is an old-style function. We should remove
  * it when all SPI flash drivers use dm
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 544ed74a5f..5fc662875e 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -74,10 +74,6 @@ extern const struct flash_info spi_nor_ids[];
 #define JEDEC_MFR(info)	((info)->id[0])
 #define JEDEC_ID(info)		(((info)->id[1]) << 8 | ((info)->id[2]))
 
-/* Get software write-protect value (BP bits) */
-int spi_flash_cmd_get_sw_write_prot(struct spi_flash *flash);
-
-
 #if CONFIG_IS_ENABLED(SPI_FLASH_MTD)
 int spi_flash_mtd_register(struct spi_flash *flash);
 void spi_flash_mtd_unregister(void);
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index 1e8744896c..f167bfab8a 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -129,13 +129,6 @@ static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len)
 	return mtd->_erase(mtd, &instr);
 }
 
-static int spi_flash_std_get_sw_write_prot(struct udevice *dev)
-{
-	struct spi_flash *flash = dev_get_uclass_priv(dev);
-
-	return spi_flash_cmd_get_sw_write_prot(flash);
-}
-
 int spi_flash_std_probe(struct udevice *dev)
 {
 	struct spi_slave *slave = dev_get_parent_priv(dev);
@@ -159,7 +152,6 @@ static const struct dm_spi_flash_ops spi_flash_std_ops = {
 	.read = spi_flash_std_read,
 	.write = spi_flash_std_write,
 	.erase = spi_flash_std_erase,
-	.get_sw_write_prot = spi_flash_std_get_sw_write_prot,
 };
 
 static const struct udevice_id spi_flash_std_ids[] = {
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 984cece0b0..c5aff6f5c6 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -2639,14 +2639,3 @@ int spi_nor_scan(struct spi_nor *nor)
 
 	return 0;
 }
-
-/* U-Boot specific functions, need to extend MTD to support these */
-int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)
-{
-	int sr = read_sr(nor);
-
-	if (sr < 0)
-		return sr;
-
-	return (sr >> 2) & 7;
-}
diff --git a/drivers/mtd/spi/spi-nor-tiny.c b/drivers/mtd/spi/spi-nor-tiny.c
index ccc0ab07af..06e3dad8c4 100644
--- a/drivers/mtd/spi/spi-nor-tiny.c
+++ b/drivers/mtd/spi/spi-nor-tiny.c
@@ -797,9 +797,3 @@ int spi_nor_scan(struct spi_nor *nor)
 
 	return 0;
 }
-
-/* U-Boot specific functions, need to extend MTD to support these */
-int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)
-{
-	return -ENOTSUPP;
-}
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 0b23f57a71..d9b2af856c 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -34,19 +34,6 @@ struct dm_spi_flash_ops {
 	int (*write)(struct udevice *dev, u32 offset, size_t len,
 		     const void *buf);
 	int (*erase)(struct udevice *dev, u32 offset, size_t len);
-	/**
-	 * get_sw_write_prot() - Check state of software write-protect feature
-	 *
-	 * SPI flash chips can lock a region of the flash defined by a
-	 * 'protected area'. This function checks if this protected area is
-	 * defined.
-	 *
-	 * @dev:	SPI flash device
-	 * @return 0 if no region is write-protected, 1 if a region is
-	 *	write-protected, -ENOSYS if the driver does not implement this,
-	 *	other -ve value on error
-	 */
-	int (*get_sw_write_prot)(struct udevice *dev);
 };
 
 /* Access the serial operations for a device */
@@ -88,20 +75,6 @@ int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
  */
 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
 
-/**
- * spl_flash_get_sw_write_prot() - Check state of software write-protect feature
- *
- * SPI flash chips can lock a region of the flash defined by a
- * 'protected area'. This function checks if this protected area is
- * defined.
- *
- * @dev:	SPI flash device
- * @return 0 if no region is write-protected, 1 if a region is
- *	write-protected, -ENOSYS if the driver does not implement this,
- *	other -ve value on error
- */
-int spl_flash_get_sw_write_prot(struct udevice *dev);
-
 /**
  * spi_flash_std_probe() - Probe a SPI flash device
  *
diff --git a/test/dm/sf.c b/test/dm/sf.c
index 7805af740e..0c3f6c3bb7 100644
--- a/test/dm/sf.c
+++ b/test/dm/sf.c
@@ -50,14 +50,6 @@ static int dm_test_spi_flash(struct unit_test_state *uts)
 	ut_assertok(spi_flash_read_dm(dev, 0, size, dst));
 	ut_assertok(memcmp(src, dst, size));
 
-	/* Try the write-protect stuff */
-	ut_assertok(uclass_first_device_err(UCLASS_SPI_EMUL, &emul));
-	ut_asserteq(0, spl_flash_get_sw_write_prot(dev));
-	sandbox_sf_set_block_protect(emul, 1);
-	ut_asserteq(1, spl_flash_get_sw_write_prot(dev));
-	sandbox_sf_set_block_protect(emul, 0);
-	ut_asserteq(0, spl_flash_get_sw_write_prot(dev));
-
 	/* Check mapping */
 	ut_assertok(dm_spi_get_mmap(dev, &map_base, &map_size, &offset));
 	ut_asserteq(0x1000, map_base);
-- 
2.20.1



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