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