1 /* 2 * (C) Copyright 2015 3 * Kamil Lulko, <kamil.lulko@gmail.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <asm/io.h> 10 #include <asm/arch/stm32.h> 11 #include "stm32_flash.h" 12 13 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; 14 15 #define STM32_FLASH ((struct stm32_flash_regs *)FLASH_CNTL_BASE) 16 17 void stm32_flash_latency_cfg(int latency) 18 { 19 /* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */ 20 writel(FLASH_ACR_WS(5) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN 21 | FLASH_ACR_DCEN, &STM32_FLASH->acr); 22 } 23 24 static void stm32_flash_lock(u8 lock) 25 { 26 if (lock) { 27 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_LOCK); 28 } else { 29 writel(STM32_FLASH_KEY1, &STM32_FLASH->key); 30 writel(STM32_FLASH_KEY2, &STM32_FLASH->key); 31 } 32 } 33 34 unsigned long flash_init(void) 35 { 36 unsigned long total_size = 0; 37 u8 i, j; 38 39 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) { 40 flash_info[i].flash_id = FLASH_STM32; 41 flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT; 42 flash_info[i].start[0] = CONFIG_SYS_FLASH_BASE + (i << 20); 43 flash_info[i].size = sect_sz_kb[0]; 44 for (j = 1; j < CONFIG_SYS_MAX_FLASH_SECT; j++) { 45 flash_info[i].start[j] = flash_info[i].start[j - 1] 46 + (sect_sz_kb[j - 1]); 47 flash_info[i].size += sect_sz_kb[j]; 48 } 49 total_size += flash_info[i].size; 50 } 51 52 return total_size; 53 } 54 55 void flash_print_info(flash_info_t *info) 56 { 57 int i; 58 59 if (info->flash_id == FLASH_UNKNOWN) { 60 printf("missing or unknown FLASH type\n"); 61 return; 62 } else if (info->flash_id == FLASH_STM32) { 63 printf("stm32 Embedded Flash\n"); 64 } 65 66 printf(" Size: %ld MB in %d Sectors\n", 67 info->size >> 20, info->sector_count); 68 69 printf(" Sector Start Addresses:"); 70 for (i = 0; i < info->sector_count; ++i) { 71 if ((i % 5) == 0) 72 printf("\n "); 73 printf(" %08lX%s", 74 info->start[i], 75 info->protect[i] ? " (RO)" : " "); 76 } 77 printf("\n"); 78 return; 79 } 80 81 int flash_erase(flash_info_t *info, int first, int last) 82 { 83 u8 bank = 0xFF; 84 int i; 85 86 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) { 87 if (info == &flash_info[i]) { 88 bank = i; 89 break; 90 } 91 } 92 if (bank == 0xFF) 93 return -1; 94 95 stm32_flash_lock(0); 96 97 for (i = first; i <= last; i++) { 98 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) 99 ; 100 101 /* clear old sector number before writing a new one */ 102 clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SNB_MASK); 103 104 if (bank == 0) { 105 setbits_le32(&STM32_FLASH->cr, 106 (i << STM32_FLASH_CR_SNB_OFFSET)); 107 } else if (bank == 1) { 108 setbits_le32(&STM32_FLASH->cr, 109 ((0x10 | i) << STM32_FLASH_CR_SNB_OFFSET)); 110 } else { 111 stm32_flash_lock(1); 112 return -1; 113 } 114 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER); 115 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_STRT); 116 117 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) 118 ; 119 120 clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER); 121 } 122 123 stm32_flash_lock(1); 124 return 0; 125 } 126 127 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt) 128 { 129 ulong i; 130 131 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) 132 ; 133 134 stm32_flash_lock(0); 135 136 setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG); 137 /* To make things simple use byte writes only */ 138 for (i = 0; i < cnt; i++) { 139 *(uchar *)(addr + i) = src[i]; 140 /* avoid re-ordering flash data write and busy status 141 * check as flash memory space attributes are generally Normal 142 */ 143 mb(); 144 while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) 145 ; 146 } 147 clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG); 148 stm32_flash_lock(1); 149 150 return 0; 151 } 152