contrib/loaders/flash/xmc1xxx/erase.S

   1 /*
   2  * Infineon XMC1000 flash sectors erase
   3  *
   4  * Copyright (c) 2016 Andreas Färber
   5  *
   6  * Based on XMC1100 AA-Step Reference Manual
   7  *
   8  * License: GPL-2.0+
   9  */
  10
  11 #include "xmc1xxx.S"
  12
  13 #define DUMMY_VALUE 0x42
  14
  15         .macro erase_page, nvmbase, addr, tmp, tmp2
  16
  17         movs    \tmp, #DUMMY_VALUE
  18         str     \tmp, [\addr]
  19
  20         busy_wait \nvmbase, \tmp, \tmp2
  21
  22         .endm
  23
  24
  25         .macro erase, nvmbase, addr, end, tmp, tmp2
  26
  27         movs    \tmp, #NVMPROG_ACTION_PAGE_ERASE_CONTINUOUS
  28         strh    \tmp, [\nvmbase, #NVMPROG]
  29 2001:
  30         erase_page \nvmbase, \addr, \tmp, \tmp2
  31
  32         movs    \tmp, #(NVM_PAGE_SIZE - 1)
  33         adds    \tmp, \tmp, #1
  34         add     \addr, \addr, \tmp
  35         cmp     \addr, \end
  36         blt     2001b
  37
  38         movs    \tmp, #NVMPROG_ACTION_IDLE
  39         strh    \tmp, [\nvmbase, #NVMPROG]
  40
  41         .endm
  42
  43
  44         /*
  45          * r0 = 0x40050000
  46          * r1 = e.g. 0x10001000
  47          * r2 = e.g. 0x10011000
  48          * NVMPROG.ACTION = 0x00
  49          */
  50 erase:
  51         erase r0, r1, r2, r3, r4
  52
  53         bkpt    #0