samv7: add support for user signature area in embedded flash
Embedded flash can have user signature area on SAMv7. This is a 512 bytes large page whose data are not erased by asserting ERASE pin or by software ERASE command. This commit adds arch to board interface for this area. It is possible to perform read, write and erase operation. SAMV7_USER_SIGNATURE option has to be set in the configuration. Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc
Alan Carvalho de Assis
parent
d0f893dfba
commit
649ccb2d45
@ -287,6 +287,10 @@ config SAMV7_HAVE_EBI
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bool
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default n
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config SAMV7_EEFC
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bool
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default n
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config SAMV7_EMAC
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bool
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default n
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@ -1786,6 +1790,7 @@ menuconfig SAMV7_PROGMEM
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bool "FLASH program memory"
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default n
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select ARCH_HAVE_PROGMEM
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select SAMV7_EEFC
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---help---
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Enable support FLASH interfaces as defined in include/nuttx/progmem.h
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@ -1804,6 +1809,16 @@ config SAMV7_PROGMEM_NSECTORS
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endif # SAMV7_PROGMEM
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config SAMV7_USER_SIGNATURE
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bool "FLASH user signature"
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default n
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select SAMV7_EEFC
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---help---
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Each SAMv7 product contains a user signature area of 512 bytes in
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embedded flash. It is possible to read, write and erase this area.
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Data stored in this area are not erased by asserting ERASE pin or by
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software ERASE command.
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menu "SDRAM Configuration"
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depends on SAMV7_SDRAMC
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@ -137,8 +137,16 @@ ifeq ($(CONFIG_SAMV7_TRNG),y)
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CHIP_CSRCS += sam_trng.c
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endif
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ifeq ($(CONFIG_SAMV7_EEFC),y)
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CHIP_CSRCS += sam_eefc.c
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endif
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ifeq ($(CONFIG_SAMV7_PROGMEM),y)
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CHIP_CSRCS += sam_progmem.c sam_eefc.c
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CHIP_CSRCS += sam_progmem.c
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endif
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ifeq ($(CONFIG_SAMV7_USER_SIGNATURE),y)
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CHIP_CSRCS += sam_us.c
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endif
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ifeq ($(CONFIG_SAMV7_PWM),y)
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191
arch/arm/src/samv7/sam_us.c
Normal file
191
arch/arm/src/samv7/sam_us.c
Normal file
@ -0,0 +1,191 @@
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/****************************************************************************
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* arch/arm/src/samv7/sam_us.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/mutex.h>
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#include <arch/samv7/chip.h>
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#include "arm_internal.h"
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#include "barriers.h"
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#include "hardware/sam_memorymap.h"
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#include "sam_eefc.h"
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#include "sam_us.h"
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#ifdef CONFIG_SAMV7_USER_SIGNATURE
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#define SAMV7_US_START (SAM_INTFLASH_BASE)
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#define SAMV7_US_SIZE (512)
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#define SAMV7_US_PAGE_WORDS (SAMV7_US_SIZE / sizeof(uint32_t))
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static uint32_t g_page_buffer[SAMV7_US_PAGE_WORDS];
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static mutex_t g_page_lock = NXMUTEX_INITIALIZER;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_erase_user_signature
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*
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* Description:
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* Erases user signature page.
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*
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* Returned Value:
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* Zero on success, negated errno value on error.
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*
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****************************************************************************/
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int sam_erase_user_signature(void)
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{
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int ret;
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ret = sam_eefc_command(EEFC_FCR_FCMD_EUS, 0);
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if (ret < 0)
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{
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return ret;
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}
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return 0;
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}
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/****************************************************************************
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* Name: sam_write_user_signature
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*
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* Description:
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* Writes data to user signature page.
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*
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* Input Parameters:
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* buffer - The buffer to be written to user signature.
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* buflen - Number of bytes to be written.
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*
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* Returned Value:
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* Number of written bytes on success, negated errno on error.
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*
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****************************************************************************/
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int sam_write_user_signature(void *buffer, size_t buflen)
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{
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uint32_t *dest;
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int ret;
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if (buflen > SAMV7_US_SIZE)
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{
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return -ENOMEM;
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}
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/* Ensure single access to gloval g_page_buffer */
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ret = nxmutex_lock(&g_page_lock);
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if (ret < 0)
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{
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return ret;
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}
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memcpy((uint8_t *)g_page_buffer, buffer, buflen);
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/* Reference manual 22.4.3.9: Write the full page, at any page address,
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* within the internal memory area address space.
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*/
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dest = (uint32_t *)SAMV7_US_START;
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for (int i = 0; i < SAMV7_US_PAGE_WORDS; i++)
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{
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*dest++ = g_page_buffer[i];
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#ifdef CONFIG_ARMV7M_DCACHE_WRITETHROUGH
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ARM_DMB();
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#endif
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}
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/* Flush the data cache to memory */
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up_clean_dcache(SAMV7_US_START, SAMV7_US_START + SAMV7_US_SIZE);
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/* EEFC_FCR_FARG does not have any affect for user signature,
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* therefore second argument can be zero.
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*/
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ret = sam_eefc_command(EEFC_FCR_FCMD_WUS, 0);
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if (ret < 0)
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{
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nxmutex_unlock(&g_page_lock);
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return ret;
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}
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nxmutex_unlock(&g_page_lock);
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return buflen;
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}
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/****************************************************************************
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* Name: sam_get_user_signature
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*
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* Description:
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* Get bytes from user signature area.
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*
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* Input Parameters:
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* buffer - The buffer to store user signature.
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* buflen - Number of bytes to be read.
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*
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* Returned Value:
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* NONE.
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*
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****************************************************************************/
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int sam_read_user_signature(void *buffer, size_t buflen)
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{
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size_t nwords;
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int ret;
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/* Ensure single access to gloval g_page_buffer */
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ret = nxmutex_lock(&g_page_lock);
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if (ret < 0)
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{
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return ret;
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}
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/* sam_eefc_readsequence requires read length in bit words. */
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nwords = (buflen + sizeof(uint32_t) / sizeof(uint32_t));
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sam_eefc_readsequence(FCMD_STUS, FCMD_SPUS, g_page_buffer, nwords);
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/* Copy local buffer to void *buffer provided by the user. */
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memcpy(buffer, (uint8_t *)g_page_buffer, buflen);
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nxmutex_unlock(&g_page_lock);
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return buflen;
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}
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#endif /* CONFIG_SAMV7_USER_SIGNATURE */
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81
arch/arm/src/samv7/sam_us.h
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81
arch/arm/src/samv7/sam_us.h
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@ -0,0 +1,81 @@
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/****************************************************************************
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* arch/arm/src/samv7/sam_us.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAMV7_SAM_US_H
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#define __ARCH_ARM_SRC_SAMV7_SAM_US_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: sam_erase_user_signature
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*
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* Description:
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* Erases user signature page.
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*
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* Returned Value:
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* Zero on success, negated errno value on error.
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*
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****************************************************************************/
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int sam_erase_user_signature(void);
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/****************************************************************************
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* Name: sam_write_user_signature
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*
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* Description:
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* Writes data to user signature page.
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*
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* Input Parameters:
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* buffer - The buffer to be written to user signature.
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* buflen - Number of bytes to be written.
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*
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* Returned Value:
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* Number of written bytes on success, negated errno on error.
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*
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****************************************************************************/
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int sam_write_user_signature(void *buffer, size_t buflen);
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/****************************************************************************
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* Name: sam_get_user_signature
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*
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* Description:
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* Get bytes from user signature area.
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*
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* Input Parameters:
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* buffer - The buffer to store user signature.
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* buflen - Number of bytes to be read.
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*
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* Returned Value:
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* NONE.
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*
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****************************************************************************/
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int sam_read_user_signature(void *buffer, size_t buflen);
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#endif /* __ARCH_ARM_SRC_SAMV7_SAM_US_H */
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