drivers/mtd/stm32_flash.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015
   4  * Kamil Lulko, <kamil.lulko@gmail.com>
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <asm/arch/stm32.h>
  10 #include "stm32_flash.h"
  11
  12 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  13
  14 #define STM32_FLASH     ((struct stm32_flash_regs *)STM32_FLASH_CNTL_BASE)
  15
  16 void stm32_flash_latency_cfg(int latency)
  17 {
  18         /* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
  19         writel(FLASH_ACR_WS(latency) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
  20                 | FLASH_ACR_DCEN, &STM32_FLASH->acr);
  21 }
  22
  23 static void stm32_flash_lock(u8 lock)
  24 {
  25         if (lock) {
  26                 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_LOCK);
  27         } else {
  28                 writel(STM32_FLASH_KEY1, &STM32_FLASH->key);
  29                 writel(STM32_FLASH_KEY2, &STM32_FLASH->key);
  30         }
  31 }
  32
  33 unsigned long flash_init(void)
  34 {
  35         unsigned long total_size = 0;
  36         u8 i, j;
  37
  38         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  39                 flash_info[i].flash_id = FLASH_STM32;
  40                 flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
  41                 flash_info[i].start[0] = CONFIG_SYS_FLASH_BASE + (i << 20);
  42                 flash_info[i].size = sect_sz_kb[0];
  43                 for (j = 1; j < CONFIG_SYS_MAX_FLASH_SECT; j++) {
  44                         flash_info[i].start[j] = flash_info[i].start[j - 1]
  45                                 + (sect_sz_kb[j - 1]);
  46                         flash_info[i].size += sect_sz_kb[j];
  47                 }
  48                 total_size += flash_info[i].size;
  49         }
  50
  51         return total_size;
  52 }
  53
  54 void flash_print_info(flash_info_t *info)
  55 {
  56         int i;
  57
  58         if (info->flash_id == FLASH_UNKNOWN) {
  59                 printf("missing or unknown FLASH type\n");
  60                 return;
  61         } else if (info->flash_id == FLASH_STM32) {
  62                 printf("stm32 Embedded Flash\n");
  63         }
  64
  65         printf("  Size: %ld MB in %d Sectors\n",
  66                info->size >> 20, info->sector_count);
  67
  68         printf("  Sector Start Addresses:");
  69         for (i = 0; i < info->sector_count; ++i) {
  70                 if ((i % 5) == 0)
  71                         printf("\n   ");
  72                 printf(" %08lX%s",
  73                        info->start[i],
  74                         info->protect[i] ? " (RO)" : "     ");
  75         }
  76         printf("\n");
  77         return;
  78 }
  79
  80 int flash_erase(flash_info_t *info, int first, int last)
  81 {
  82         u8 bank = 0xFF;
  83         int i;
  84
  85         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  86                 if (info == &flash_info[i]) {
  87                         bank = i;
  88                         break;
  89                 }
  90         }
  91         if (bank == 0xFF)
  92                 return -1;
  93
  94         stm32_flash_lock(0);
  95
  96         for (i = first; i <= last; i++) {
  97                 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
  98                         ;
  99
 100                 /* clear old sector number before writing a new one */
 101                 clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SNB_MASK);
 102
 103                 if (bank == 0) {
 104                         setbits_le32(&STM32_FLASH->cr,
 105                                      (i << STM32_FLASH_CR_SNB_OFFSET));
 106                 } else if (bank == 1) {
 107                         setbits_le32(&STM32_FLASH->cr,
 108                                      ((0x10 | i) << STM32_FLASH_CR_SNB_OFFSET));
 109                 } else {
 110                         stm32_flash_lock(1);
 111                         return -1;
 112                 }
 113                 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
 114                 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_STRT);
 115
 116                 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
 117                         ;
 118
 119                 clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
 120         }
 121
 122         stm32_flash_lock(1);
 123         return 0;
 124 }
 125
 126 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 127 {
 128         ulong i;
 129
 130         while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
 131                 ;
 132
 133         stm32_flash_lock(0);
 134
 135         setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
 136         /* To make things simple use byte writes only */
 137         for (i = 0; i < cnt; i++) {
 138                 *(uchar *)(addr + i) = src[i];
 139                 /*  avoid re-ordering flash data write and busy status
 140                  *  check as flash memory space attributes are generally Normal
 141                  */
 142                 mb();
 143                 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
 144                         ;
 145         }
 146         clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
 147         stm32_flash_lock(1);
 148
 149         return 0;
 150 }