bertos/cpu/cortex-m3/drv/flash_stm32.c

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  29  * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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  32  *
  33  * \brief STM32F103xx internal flash memory driver.
  34  *
  35  * \author Daniele Basile <asterix@develer.com>
  36  */
  37
  38 #include "flash_stm32.h"
  39
  40 #include "cfg/cfg_emb_flash.h"
  41
  42 // Define log settings for cfg/log.h
  43 #define LOG_LEVEL    CONFIG_FLASH_EMB_LOG_LEVEL
  44 #define LOG_FORMAT   CONFIG_FLASH_EMB_LOG_FORMAT
  45 #include <cfg/log.h>
  46
  47 #include <drv/timer.h>
  48 #include <drv/flash.h>
  49
  50 #include <cpu/power.h>
  51 #include <cpu/detect.h>
  52
  53 #include <io/stm32.h>
  54
  55 #include <string.h>
  56
  57 #define EMB_FLASH                ((struct stm32_flash*)FLASH_R_BASE)
  58
  59 #if CPU_CM3_STM32F103RB
  60         #define EMB_FLASH_PAGE_SIZE   1024
  61 #else
  62         #error Unknown CPU
  63 #endif
  64
  65
  66 struct FlashHardware
  67 {
  68         uint8_t status;
  69 };
  70
  71 INLINE bool flash_wait(struct KBlock *blk)
  72 {
  73         Flash *fls = FLASH_CAST(blk);
  74         ticks_t start = timer_clock();
  75         while (true)
  76         {
  77                 if (!(EMB_FLASH->SR & FLASH_FLAG_BSY))
  78                         break;
  79
  80                 if (EMB_FLASH->SR & FLASH_FLAG_PGERR)
  81                 {
  82                         fls->hw->status |= FLASH_NOT_ERASED;
  83                         LOG_ERR("flash not erased..\n");
  84                         return false;
  85                 }
  86
  87                 if (EMB_FLASH->SR & FLASH_FLAG_WRPRTERR)
  88                 {
  89                         fls->hw->status |= FLASH_WR_PROTECT;
  90                         LOG_ERR("wr protect..\n");
  91                         return false;
  92                 }
  93
  94                 if (timer_clock() - start > ms_to_ticks(CONFIG_FLASH_WR_TIMEOUT))
  95                 {
  96                         fls->hw->status |= FLASH_WR_TIMEOUT;
  97                         LOG_ERR("Timeout..\n");
  98                         return false;
  99                 }
 100
 101                 cpu_relax();
 102         }
 103
 104         return true;
 105 }
 106
 107 static bool stm32_erasePage(struct KBlock *blk, uint32_t page_add)
 108 {
 109
 110         EMB_FLASH->CR |= CR_PER_SET;
 111         EMB_FLASH->AR = page_add;
 112         EMB_FLASH->CR |= CR_STRT_SET;
 113
 114         if (!flash_wait(blk))
 115                 return false;
 116
 117         EMB_FLASH->CR &= CR_PER_RESET;
 118
 119         return true;
 120 }
 121
 122 static bool stm32_eraseAll(struct KBlock *blk)
 123 {
 124         EMB_FLASH->CR |= CR_MER_SET;
 125         EMB_FLASH->CR |= CR_STRT_SET;
 126
 127         if (!flash_wait(blk))
 128                 return false;
 129
 130         EMB_FLASH->CR &= CR_MER_RESET;
 131
 132         return true;
 133 }
 134
 135 static int stm32_flash_error(struct KBlock *blk)
 136 {
 137         Flash *fls = FLASH_CAST(blk);
 138         return fls->hw->status;
 139 }
 140
 141 static void stm32_flash_clearerror(struct KBlock *blk)
 142 {
 143         Flash *fls = FLASH_CAST(blk);
 144         fls->hw->status = 0;
 145 }
 146
 147 static size_t stm32_flash_readDirect(struct KBlock *blk, block_idx_t idx, void *buf, size_t offset, size_t size)
 148 {
 149         memcpy(buf, (void *)(idx * blk->blk_size + offset), size);
 150
 151         return size;
 152 }
 153
 154
 155 INLINE bool stm32_writeWord(struct KBlock *blk, uint32_t addr, uint16_t data)
 156 {
 157         ASSERT(!(addr % 2));
 158
 159         EMB_FLASH->CR |= CR_PG_SET;
 160
 161         *(reg16_t *)addr = data;
 162
 163         if (!flash_wait(blk))
 164                 return false;
 165
 166         EMB_FLASH->CR &= CR_PG_RESET;
 167
 168         return true;
 169 }
 170
 171 static size_t stm32_flash_writeDirect(struct KBlock *blk, block_idx_t idx, const void *_buf, size_t offset, size_t size)
 172 {
 173         if (!stm32_erasePage(blk, (idx * blk->blk_size)))
 174                 return 0;
 175
 176         uint32_t addr = idx * blk->blk_size + offset;
 177         const uint8_t *buf = (const uint8_t *)_buf;
 178         size_t count = 0;
 179
 180         if (addr % 2)
 181         {
 182                 if (!stm32_writeWord(blk, addr - 1, (buf[0] << 8) | 0xFF))
 183                         return count;
 184
 185                 buf++;
 186                 size--;
 187                 count++;
 188                 addr++;
 189         }
 190
 191         ASSERT(!(addr % 2));
 192         while (size)
 193         {
 194                 uint16_t data;
 195                 size_t len;
 196                 if (size == 1)
 197                 {
 198                         data = 0xFF00 | *buf;
 199                         len = 1;
 200                 }
 201                 else
 202                 {
 203                         data = ((*buf + 1) << 8) | *buf;
 204                         len = 2;
 205                 }
 206
 207                 if (!stm32_writeWord(blk, addr, data))
 208                         return count;
 209
 210                 buf += len;
 211                 size -= len;
 212                 count += len;
 213                 addr += len;
 214         }
 215         return count;
 216 }
 217
 218 static const KBlockVTable flash_stm32_buffered_vt =
 219 {
 220         .readDirect = stm32_flash_readDirect,
 221         .writeDirect = stm32_flash_writeDirect,
 222
 223         .readBuf = kblock_swReadBuf,
 224         .writeBuf = kblock_swWriteBuf,
 225         .load = kblock_swLoad,
 226         .store = kblock_swStore,
 227
 228         .error = stm32_flash_error,
 229         .clearerr = stm32_flash_clearerror,
 230 };
 231
 232
 233
 234 static const KBlockVTable flash_stm32_unbuffered_vt =
 235 {
 236         .readDirect = stm32_flash_readDirect,
 237         .writeDirect = stm32_flash_writeDirect,
 238
 239         .error = stm32_flash_error,
 240         .clearerr = stm32_flash_clearerror,
 241 };
 242
 243 static struct FlashHardware flash_stm32_hw;
 244 static uint8_t flash_buf[EMB_FLASH_PAGE_SIZE];
 245
 246 static void common_init(Flash *fls)
 247 {
 248         memset(fls, 0, sizeof(*fls));
 249         DB(fls->blk.priv.type = KBT_FLASH);
 250
 251         EMB_FLASH->CR = 0;
 252
 253         fls->hw = &flash_stm32_hw;
 254
 255         fls->blk.blk_size = EMB_FLASH_PAGE_SIZE;
 256         fls->blk.blk_cnt = (F_SIZE * 1024) / EMB_FLASH_PAGE_SIZE;
 257
 258         /* Unlock flash memory for the FPEC Access */
 259         EMB_FLASH->KEYR = FLASH_KEY1;
 260         EMB_FLASH->KEYR = FLASH_KEY2;
 261 }
 262
 263
 264 void flash_hw_init(Flash *fls)
 265 {
 266         common_init(fls);
 267         fls->blk.priv.vt = &flash_stm32_buffered_vt;
 268         fls->blk.priv.flags |= KB_BUFFERED | KB_PARTIAL_WRITE;
 269         fls->blk.priv.buf = flash_buf;
 270 }
 271
 272 void flash_hw_initUnbuffered(Flash *fls)
 273 {
 274         common_init(fls);
 275         fls->blk.priv.vt = &flash_stm32_unbuffered_vt;
 276 }