contrib/loaders/flash/xmc1xxx/xmc1xxx.S

   1 /*
   2  * Infineon XMC1000 flash
   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         .text
  12         .syntax unified
  13         .cpu cortex-m0
  14         .thumb
  15         .thumb_func
  16
  17 #define NVMSTATUS       0x00
  18 #define NVMPROG         0x04
  19 #define NVMCONF         0x08
  20
  21 #define NVMSTATUS_BUSY          (1 << 0)
  22 #define NVMSTATUS_VERR_NOFAIL   (0x0 << 2)
  23 #define NVMSTATUS_VERR_MASK     (0x3 << 2)
  24
  25 #define NVMPROG_ACTION_IDLE                     0x00
  26 #define NVMPROG_ACTION_WRITE_CONTINUOUS         0xA1
  27 #define NVMPROG_ACTION_PAGE_ERASE_CONTINUOUS    0xA2
  28 #define NVMPROG_ACTION_VERIFY_CONTINUOUS        0xE0
  29
  30 #define NVMCONF_HRLEV_NR        (0x0 << 1)
  31 #define NVMCONF_HRLEV_HRE       (0x2 << 1)
  32 #define NVMCONF_HRLEV_MASK      (0x3 << 1)
  33
  34 #define NVM_WORD_SIZE   4
  35 #define NVM_BLOCK_SIZE  (4 * NVM_WORD_SIZE)
  36 #define NVM_PAGE_SIZE   (16 * NVM_BLOCK_SIZE)
  37
  38         .macro busy_wait, nvmbase, tmp, tmp2
  39 1:
  40         ldrh    \tmp, [\nvmbase, #NVMSTATUS]
  41         movs    \tmp2, #NVMSTATUS_BUSY
  42         ands    \tmp, \tmp, \tmp2
  43         cmp     \tmp, \tmp2
  44         beq     1b
  45
  46         .endm