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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 #define ao_flash_wait_bsy() do { while (stm_flash.sr & (1 << STM_FLASH_SR_BSY)); } while (0)
  48
  49 static void __attribute__ ((section(".ramtext"),noinline))
  50 _ao_flash_erase_page(uint32_t *page)
  51 {
  52         stm_flash.cr |= (1 << STM_FLASH_CR_PER);
  53
  54         stm_flash.ar = (uintptr_t) page;
  55
  56         stm_flash.cr |= (1 << STM_FLASH_CR_STRT);
  57
  58         ao_flash_wait_bsy();
  59
  60         stm_flash.cr &= ~(1 << STM_FLASH_CR_PER);
  61 }
  62
  63 static uint32_t
  64 stm_flash_page_size(void)
  65 {
  66         uint16_t        dev_id = stm_dev_id();
  67
  68         switch (dev_id) {
  69         case 0x440:     /* stm32f05x */
  70         case 0x444:     /* stm32f03x */
  71         case 0x445:     /* stm32f04x */
  72                 return 1024;
  73         case 0x442:     /* stm32f09x */
  74         case 0x448:     /* stm32f07x */
  75                 return 2048;
  76         }
  77         ao_panic(AO_PANIC_FLASH);
  78         return 0;
  79 }
  80
  81 void
  82 ao_flash_erase_page(uint32_t *page)
  83 {
  84         /* Erase the whole page at the start. This assumes we'll be flashing things
  85          * in memory order
  86          */
  87
  88         if ((uintptr_t) page & (stm_flash_page_size() - 1))
  89                 return;
  90
  91         ao_arch_block_interrupts();
  92         ao_flash_unlock();
  93
  94         _ao_flash_erase_page(page);
  95
  96         ao_flash_lock();
  97         ao_arch_release_interrupts();
  98 }
  99
 100 static void __attribute__ ((section(".ramtext"), noinline))
 101 _ao_flash_page(uint16_t *dst, uint16_t *src)
 102 {
 103         uint8_t         i;
 104
 105         stm_flash.cr |= (1 << STM_FLASH_CR_PG);
 106
 107         for (i = 0; i < 128; i++) {
 108                 *dst++ = *src++;
 109                 ao_flash_wait_bsy();
 110         }
 111
 112         stm_flash.cr &= ~(1 << STM_FLASH_CR_PG);
 113 }
 114
 115 void
 116 ao_flash_page(uint32_t *page, uint32_t *src)
 117 {
 118         ao_flash_erase_page(page);
 119
 120         ao_arch_block_interrupts();
 121         ao_flash_unlock();
 122
 123         _ao_flash_page((uint16_t *) page, (uint16_t *) src);
 124
 125         ao_flash_lock();
 126         ao_arch_release_interrupts();
 127 }