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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | /* * Copyright (c) 2019 Richard Osterloh <richard.osterloh@gmail.com> * * SPDX-License-Identifier: Apache-2.0 */ #define LOG_DOMAIN flash_stm32g4 #define LOG_LEVEL CONFIG_FLASH_LOG_LEVEL #include <logging/log.h> LOG_MODULE_REGISTER(LOG_DOMAIN); #include <kernel.h> #include <device.h> #include <string.h> #include <drivers/flash.h> #include <init.h> #include <soc.h> #include "flash_stm32.h" #define STM32G4X_PAGE_SHIFT 11 /* * offset and len must be aligned on 8 for write, * positive and not beyond end of flash */ bool flash_stm32_valid_range(const struct device *dev, off_t offset, uint32_t len, bool write) { return (!write || (offset % 8 == 0 && len % 8 == 0U)) && flash_stm32_range_exists(dev, offset, len); } /* * STM32G4xx devices can have up to 64 2K pages in a single banks */ static unsigned int get_page(off_t offset) { return offset >> STM32G4X_PAGE_SHIFT; } static int write_dword(const struct device *dev, off_t offset, uint64_t val) { volatile uint32_t *flash = (uint32_t *)(offset + CONFIG_FLASH_BASE_ADDRESS); FLASH_TypeDef *regs = FLASH_STM32_REGS(dev); uint32_t tmp; int rc; /* if the control register is locked, do not fail silently */ if (regs->CR & FLASH_CR_LOCK) { LOG_ERR("CR locked"); return -EIO; } /* Check that no Flash main memory operation is ongoing */ rc = flash_stm32_wait_flash_idle(dev); if (rc < 0) { return rc; } /* Check if this double word is erased */ if (flash[0] != 0xFFFFFFFFUL || flash[1] != 0xFFFFFFFFUL) { LOG_ERR("Word at offs %d not erased", offset); return -EIO; } /* Set the PG bit */ regs->CR |= FLASH_CR_PG; /* Flush the register write */ tmp = regs->CR; /* Perform the data write operation at the desired memory address */ flash[0] = (uint32_t)val; flash[1] = (uint32_t)(val >> 32); /* Wait until the BSY bit is cleared */ rc = flash_stm32_wait_flash_idle(dev); /* Clear the PG bit */ regs->CR &= (~FLASH_CR_PG); return rc; } static int erase_page(const struct device *dev, unsigned int page) { FLASH_TypeDef *regs = FLASH_STM32_REGS(dev); uint32_t tmp; int rc; /* if the control register is locked, do not fail silently */ if (regs->CR & FLASH_CR_LOCK) { LOG_ERR("CR locked"); return -EIO; } /* Check that no Flash memory operation is ongoing */ rc = flash_stm32_wait_flash_idle(dev); if (rc < 0) { return rc; } #ifdef FLASH_OPTR_DBANK if (page > 127) { if (!(regs->OPTR & FLASH_OPTR_DBANK)) { LOG_ERR("Page %d does not exist when DBANK=0", page); return -EINVAL; } /* The pages to be erased is in bank 2*/ regs->CR |= FLASH_CR_BKER; page = page - 128; LOG_DBG("Erase page %d on bank 2", page); } else { LOG_DBG("Erase page %d on bank 1", page); } __ASSERT(page <= 127, "There are only 127 pages, but page is %d", page); #endif /* Set the PER bit and select the page you wish to erase */ regs->CR |= FLASH_CR_PER; regs->CR &= ~FLASH_CR_PNB_Msk; regs->CR |= (page << FLASH_CR_PNB_Pos); /* Set the STRT bit */ regs->CR |= FLASH_CR_STRT; /* flush the register write */ tmp = regs->CR; /* Wait for the BSY bit */ rc = flash_stm32_wait_flash_idle(dev); #ifdef FLASH_OPTR_DBANK regs->CR &= ~(FLASH_CR_PER | FLASH_CR_BKER); #else regs->CR &= ~(FLASH_CR_PER); #endif return rc; } int flash_stm32_block_erase_loop(const struct device *dev, unsigned int offset, unsigned int len) { int i, rc = 0; i = get_page(offset); for (; i <= get_page(offset + len - 1) ; ++i) { rc = erase_page(dev, i); if (rc < 0) { break; } } return rc; } int flash_stm32_write_range(const struct device *dev, unsigned int offset, const void *data, unsigned int len) { int i, rc = 0; for (i = 0; i < len; i += 8, offset += 8) { rc = write_dword(dev, offset, ((const uint64_t *) data)[i>>3]); if (rc < 0) { return rc; } } return rc; } void flash_stm32_page_layout(const struct device *dev, const struct flash_pages_layout **layout, size_t *layout_size) { static struct flash_pages_layout stm32g4_flash_layout = { .pages_count = 0, .pages_size = 0, }; ARG_UNUSED(dev); if (stm32g4_flash_layout.pages_count == 0) { stm32g4_flash_layout.pages_count = FLASH_SIZE / FLASH_PAGE_SIZE; stm32g4_flash_layout.pages_size = FLASH_PAGE_SIZE; } *layout = &stm32g4_flash_layout; *layout_size = 1; } |