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   1 /*
   2  * Copyright © 2013 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include <ao.h>
  20 #include <ao_flash.h>
  21
  22 static uint8_t
  23 ao_flash_is_locked(void)
  24 {
  25         return (stm_flash.cr & (1 << STM_FLASH_CR_LOCK)) != 0;
  26 }
  27
  28 static void
  29 ao_flash_unlock(void)
  30 {
  31         if (!ao_flash_is_locked())
  32                 return;
  33
  34         /* Unlock FLASH_CR register */
  35         stm_flash.keyr = STM_FLASH_KEYR_KEY1;
  36         stm_flash.keyr = STM_FLASH_KEYR_KEY2;
  37         if (ao_flash_is_locked())
  38                 ao_panic(AO_PANIC_FLASH);
  39 }
  40
  41 static void
  42 ao_flash_lock(void)
  43 {
  44         stm_flash.cr |= (1 << STM_FLASH_CR_LOCK);
  45 }
  46
  47 static void
  48 ao_flash_wait_bsy(void)
  49 {
  50         while (stm_flash.sr & (1 << STM_FLASH_SR_BSY))
  51                 ;
  52 }
  53
  54 static void __attribute__ ((section(".ramtext"),noinline))
  55 _ao_flash_erase_page(uint32_t *page)
  56 {
  57         stm_flash.cr |= (1 << STM_FLASH_CR_PER);
  58
  59         stm_flash.ar = (uintptr_t) page;
  60
  61         stm_flash.cr |= (1 << STM_FLASH_CR_STRT);
  62
  63         ao_flash_wait_bsy();
  64
  65         stm_flash.cr &= ~(1 << STM_FLASH_CR_PER);
  66 }
  67
  68 static uint32_t
  69 stm_flash_page_size(void)
  70 {
  71         uint16_t        dev_id = stm_dev_id();
  72
  73         switch (dev_id) {
  74         case 0x440:     /* stm32f05x */
  75         case 0x444:     /* stm32f03x */
  76         case 0x445:     /* stm32f04x */
  77                 return 1024;
  78         case 0x442:     /* stm32f09x */
  79         case 0x448:     /* stm32f07x */
  80                 return 2048;
  81         }
  82         ao_panic(AO_PANIC_FLASH);
  83         return 0;
  84 }
  85
  86 void
  87 ao_flash_erase_page(uint32_t *page)
  88 {
  89         /* Erase the whole page at the start. This assumes we'll be flashing things
  90          * in memory order
  91          */
  92
  93         if ((uintptr_t) page & (stm_flash_page_size() - 1))
  94                 return;
  95
  96         ao_arch_block_interrupts();
  97         ao_flash_unlock();
  98
  99         _ao_flash_erase_page(page);
 100
 101         ao_flash_lock();
 102         ao_arch_release_interrupts();
 103 }
 104
 105 static void __attribute__ ((section(".ramtext"), noinline))
 106 _ao_flash_page(uint16_t *dst, uint16_t *src)
 107 {
 108         uint8_t         i;
 109
 110         stm_flash.cr |= (1 << STM_FLASH_CR_PG);
 111
 112         for (i = 0; i < 128; i++) {
 113                 *dst++ = *src++;
 114                 ao_flash_wait_bsy();
 115         }
 116
 117         stm_flash.cr &= ~(1 << STM_FLASH_CR_PG);
 118 }
 119
 120 void
 121 ao_flash_page(uint32_t *page, uint32_t *src)
 122 {
 123         ao_flash_erase_page(page);
 124
 125         ao_arch_block_interrupts();
 126         ao_flash_unlock();
 127
 128         _ao_flash_page((uint16_t *) page, (uint16_t *) src);
 129
 130         ao_flash_lock();
 131         ao_arch_release_interrupts();
 132 }