stm32: flash: BSY bit has never been writable.

This has been copied around for years, but has never been a writable bit
on any target.

include/libopencm3/stm32/common/flash_common_f01.h

@@ -105,7 +105,6 @@ void flash_lock(void);
 void flash_clear_pgerr_flag(void);
 void flash_clear_eop_flag(void);
 void flash_clear_wrprterr_flag(void);
-void flash_clear_bsy_flag(void);
 void flash_clear_status_flags(void);
 uint32_t flash_get_status_flags(void);
 void flash_wait_for_last_operation(void);

include/libopencm3/stm32/common/flash_common_f234.h

@@ -79,7 +79,6 @@ void flash_unlock(void);
 void flash_lock(void);
 void flash_clear_pgperr_flag(void);
 void flash_clear_eop_flag(void);
-void flash_clear_bsy_flag(void);
 void flash_clear_status_flags(void);
 void flash_wait_for_last_operation(void);
 

include/libopencm3/stm32/f1/flash.h

@@ -111,7 +111,6 @@ void flash_lock_upper(void);
 void flash_clear_pgerr_flag_upper(void);
 void flash_clear_eop_flag_upper(void);
 void flash_clear_wrprterr_flag_upper(void);
-void flash_clear_bsy_flag_upper(void);
 
 END_DECLS
 

include/libopencm3/stm32/f7/flash.h

@@ -50,8 +50,6 @@
  * 	by F7 require more than 7 wait states.
  * 4. 	FLASH_SR_PGSERR (programming sequence error) is now FLASH_SR_ERSERR (
  *	erase sequence error).
- * 5. 	FLASH_SR_BSY field is now read-only. Seems to also be read-only in F4?
- *	Why did we have a clear busy flag function?
  * 6. 	There are now two watchdogs - IWDG (independent watchdog) and WWDG (
  * 	window watchdog).
  */

include/libopencm3/stm32/l4/flash.h

@@ -227,7 +227,6 @@ void flash_unlock(void);
 void flash_lock(void);
 void flash_clear_pgperr_flag(void);
 void flash_clear_eop_flag(void);
-void flash_clear_bsy_flag(void);
 void flash_wait_for_last_operation(void);
 void flash_dcache_enable(void);
 void flash_dcache_disable(void);

lib/stm32/common/flash_common_f01.c

@@ -127,16 +127,6 @@ void flash_clear_wrprterr_flag(void)
 	FLASH_SR |= FLASH_SR_WRPRTERR;
 }
 
-/*---------------------------------------------------------------------------*/
-/** @brief Clear the Busy Status Flag
-
-*/
-
-void flash_clear_bsy_flag(void)
-{
-	FLASH_SR &= ~FLASH_SR_BSY;
-}
-
 /*---------------------------------------------------------------------------*/
 /** @brief Wait until Last Operation has Ended
 

lib/stm32/common/flash_common_f234.c

@@ -92,16 +92,6 @@ void flash_clear_eop_flag(void)
 	FLASH_SR |= FLASH_SR_EOP;
 }
 
-/*---------------------------------------------------------------------------*/
-/** @brief Clear the Busy Status Flag
-
-*/
-
-void flash_clear_bsy_flag(void)
-{
-	FLASH_SR &= ~FLASH_SR_BSY;
-}
-
 
 /*---------------------------------------------------------------------------*/
 /** @brief Wait until Last Operation has Ended

lib/stm32/common/flash_common_f24.c

@@ -176,7 +176,6 @@ void flash_clear_status_flags(void)
 	flash_clear_wrperr_flag();
 	flash_clear_pgperr_flag();
 	flash_clear_eop_flag();
-	flash_clear_bsy_flag();
 }
 
 /*---------------------------------------------------------------------------*/

lib/stm32/f0/flash.c

@@ -61,7 +61,6 @@ void flash_clear_status_flags(void)
 	flash_clear_pgerr_flag();
 	flash_clear_eop_flag();
 	flash_clear_wrprterr_flag();
-	flash_clear_bsy_flag();
 }
 
 /*---------------------------------------------------------------------------*/

lib/stm32/f1/flash.c

@@ -155,18 +155,6 @@ void flash_clear_wrprterr_flag_upper(void)
 	}
 }
 
-/*---------------------------------------------------------------------------*/
-/** @brief Clear the Busy Status Flag, upper Bank
-
-*/
-
-void flash_clear_bsy_flag_upper(void)
-{
-	if (DESIG_FLASH_SIZE > 512) {
-		FLASH_SR2 &= ~FLASH_SR_BSY;
-	}
-}
-
 /*---------------------------------------------------------------------------*/
 /** @brief Clear All Status Flags
 
@@ -178,12 +166,10 @@ void flash_clear_status_flags(void)
 	flash_clear_pgerr_flag();
 	flash_clear_eop_flag();
 	flash_clear_wrprterr_flag();
-	flash_clear_bsy_flag();
 	if (DESIG_FLASH_SIZE > 512) {
 		flash_clear_pgerr_flag_upper();
 		flash_clear_eop_flag_upper();
 		flash_clear_wrprterr_flag_upper();
-		flash_clear_bsy_flag_upper();
 	}
 }
 

lib/stm32/f3/flash.c

@@ -56,7 +56,6 @@ void flash_clear_status_flags(void)
 {
 	flash_clear_pgperr_flag();
 	flash_clear_eop_flag();
-	flash_clear_bsy_flag();
 }
 
 /**

lib/stm32/l4/flash.c

@@ -122,14 +122,6 @@ void flash_clear_eop_flag(void)
 	FLASH_SR |= FLASH_SR_EOP;
 }
 
-/** @brief Clear the Busy Status Flag
- */
-void flash_clear_bsy_flag(void)
-{
-	FLASH_SR &= ~FLASH_SR_BSY;
-}
-
-
 /** @brief Wait until Last Operation has Ended
  * This loops indefinitely until an operation (write or erase) has completed
  * by testing the busy flag.
@@ -216,7 +208,6 @@ void flash_clear_status_flags(void)
 	flash_clear_wrperr_flag();
 	flash_clear_pgperr_flag();
 	flash_clear_eop_flag();
-	flash_clear_bsy_flag();
 }
 
 /** @brief Unlock the Option Byte Access