From 633c646ab36368caf6eaeedd326d9f1835196afd Mon Sep 17 00:00:00 2001 From: henryk Date: Tue, 6 Nov 2007 20:26:48 +0000 Subject: Initial import of FreeRTOS code for OpenPICC git-svn-id: https://svn.openpcd.org:2342/trunk@311 6dc7ffe9-61d6-0310-9af1-9938baff3ed1 --- openpicc/application/env.c | 149 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 openpicc/application/env.c (limited to 'openpicc/application/env.c') diff --git a/openpicc/application/env.c b/openpicc/application/env.c new file mode 100644 index 0000000..92c8014 --- /dev/null +++ b/openpicc/application/env.c @@ -0,0 +1,149 @@ +/*************************************************************** + * + * OpenBeacon.org - flash routines for persistent environment + * + * Copyright 2007 Milosch Meriac + * + *************************************************************** + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +*/ +#include +#include +#include +#include +#include +#include +#include "env.h" + +#define EFCS_CMD_WRITE_PAGE 0x1 +#define EFCS_CMD_SET_LOCK_BIT 0x2 +#define EFCS_CMD_WRITE_PAGE_LOCK 0x3 +#define EFCS_CMD_CLEAR_LOCK 0x4 +#define EFCS_CMD_ERASE_ALL 0x8 +#define EFCS_CMD_SET_NVM_BIT 0xb +#define EFCS_CMD_CLEAR_NVM_BIT 0xd +#define EFCS_CMD_SET_SECURITY_BIT 0xf + +#define PAGES_PER_LOCKREGION (AT91C_IFLASH_LOCK_REGION_SIZE>>AT91C_IFLASH_PAGE_SHIFT) +#define IS_FIRST_PAGE_OF_LOCKREGION(x) ((x % PAGES_PER_LOCKREGION) == 0) +#define LOCKREGION_FROM_PAGE(x) (x / PAGES_PER_LOCKREGION) +#define ENV_FLASH ((unsigned int *)AT91C_IFLASH + AT91C_IFLASH_SIZE - ENVIRONMENT_SIZE) + +TEnvironmentBlock env; + +static inline unsigned short RAMFUNC page_from_ramaddr(const void *addr) +{ + unsigned long ramaddr = (unsigned long) addr; + ramaddr -= (unsigned long) AT91C_IFLASH; + return ((ramaddr >> AT91C_IFLASH_PAGE_SHIFT)); +} + +static inline int RAMFUNC is_page_locked(unsigned short page) +{ + unsigned short lockregion = LOCKREGION_FROM_PAGE(page); + + return (AT91C_BASE_MC->MC_FSR & (lockregion << 16)); +} + +static inline void RAMFUNC flash_cmd_wait(void) +{ + while(( *AT91C_MC_FSR & AT91C_MC_FRDY ) != AT91C_MC_FRDY ); +} + +static inline void RAMFUNC unlock_page(unsigned short page) +{ + page &= 0x3ff; + AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_UNLOCK | + AT91C_MC_CORRECT_KEY | (page << 8)); + flash_cmd_wait(); +} + +static inline void RAMFUNC flash_page(const void *addr) +{ + unsigned short page = page_from_ramaddr(addr) & 0x3ff; + + if (is_page_locked(page)) + unlock_page(page); + + AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_START_PROG | + AT91C_MC_CORRECT_KEY | (page << 8)); + flash_cmd_wait(); +} + +unsigned short RAMFUNC env_crc16 (const unsigned char *buffer, int size) +{ + unsigned short crc = 0xFFFF; + + if(buffer && size) + while (size--) + { + crc = (crc >> 8) | (crc << 8); + crc ^= *buffer++; + crc ^= ((unsigned char) crc) >> 4; + crc ^= crc << 12; + crc ^= (crc & 0xFF) << 5; + } + + return crc; +} + +void RAMFUNC env_store(void) +{ + unsigned int i,*src,*dst; + + /* During flashing only RAMFUNC code may be executed. + * For now, this means that no other code whatsoever may + * be run until this function returns. */ + vTaskSuspendAll(); + portENTER_CRITICAL(); + + env.e.magic=TENVIRONMENT_MAGIC; + env.e.crc16=0; + env.e.size=sizeof(env); + env.e.crc16=env_crc16((unsigned char*)&env,sizeof(env)); + + src=env.data; + dst=ENV_FLASH; + for (i = 0; i < (sizeof(env.data)/sizeof(env.data[0])); i++) + *dst++ = *src++; + + flash_page(ENV_FLASH); + + portEXIT_CRITICAL(); + xTaskResumeAll(); +} + +int env_load(void) +{ + unsigned int crc; + + memcpy(&env,ENV_FLASH,sizeof(env)); + + if(env.e.magic!=TENVIRONMENT_MAGIC || env.e.size!=sizeof(env) ) + return 0; + + crc=env.e.crc16; + env.e.crc16=0; + + return env_crc16((unsigned char*)&env,sizeof(env))==crc; +} + +void env_init(void) +{ + unsigned int fmcn = AT91F_MC_EFC_ComputeFMCN(MCK); + + AT91F_MC_EFC_CfgModeReg(AT91C_BASE_MC, fmcn << 16 | AT91C_MC_FWS_3FWS); +} -- cgit v1.2.3