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Diffstat (limited to 'platforms/arm_atsam/eeprom.c')
| -rw-r--r-- | platforms/arm_atsam/eeprom.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/platforms/arm_atsam/eeprom.c b/platforms/arm_atsam/eeprom.c new file mode 100644 index 0000000000..ff1a692623 --- /dev/null +++ b/platforms/arm_atsam/eeprom.c @@ -0,0 +1,184 @@ +/* Copyright 2017 Fred Sundvik + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include "eeprom.h" +#include "debug.h" +#include "samd51j18a.h" +#include "core_cm4.h" +#include "component/nvmctrl.h" + +#ifndef EEPROM_SIZE +# include "eeconfig.h" +# define EEPROM_SIZE (((EECONFIG_SIZE + 3) / 4) * 4) // based off eeconfig's current usage, aligned to 4-byte sizes, to deal with LTO +#endif + +#ifndef MAX +# define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) +#endif + +#ifndef BUSY_RETRIES +# define BUSY_RETRIES 10000 +#endif + +// #define DEBUG_EEPROM_OUTPUT + +/* + * Debug print utils + */ +#if defined(DEBUG_EEPROM_OUTPUT) +# define eeprom_printf(fmt, ...) xprintf(fmt, ##__VA_ARGS__); +#else /* NO_DEBUG */ +# define eeprom_printf(fmt, ...) +#endif /* NO_DEBUG */ + +__attribute__((aligned(4))) static uint8_t buffer[EEPROM_SIZE] = {0}; +volatile uint8_t * SmartEEPROM8 = (uint8_t *)SEEPROM_ADDR; + +static inline bool eeprom_is_busy(void) { + int timeout = BUSY_RETRIES; + while (NVMCTRL->SEESTAT.bit.BUSY && timeout-- > 0) + ; + + return NVMCTRL->SEESTAT.bit.BUSY; +} + +static uint32_t get_virtual_eeprom_size(void) { + // clang-format off + static const uint32_t VIRTUAL_EEPROM_MAP[11][8] = { + /* 4 8 16 32 64 128 256 512 */ + /* 0*/ { 0, 0, 0, 0, 0, 0, 0, 0 }, + /* 1*/ { 512, 1024, 2048, 4096, 4096, 4096, 4096, 4096 }, + /* 2*/ { 512, 1024, 2048, 4096, 8192, 8192, 8192, 8192 }, + /* 3*/ { 512, 1024, 2048, 4096, 8192, 16384, 16384, 16384 }, + /* 4*/ { 512, 1024, 2048, 4096, 8192, 16384, 16384, 16384 }, + /* 5*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 }, + /* 6*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 }, + /* 7*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 }, + /* 8*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 }, + /* 9*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 }, + /*10*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 }, + }; + // clang-format on + + static uint32_t virtual_eeprom_size = UINT32_MAX; + if (virtual_eeprom_size == UINT32_MAX) { + virtual_eeprom_size = VIRTUAL_EEPROM_MAP[NVMCTRL->SEESTAT.bit.PSZ][NVMCTRL->SEESTAT.bit.SBLK]; + } + // eeprom_printf("get_virtual_eeprom_size:: %d:%d:%d\n", NVMCTRL->SEESTAT.bit.PSZ, NVMCTRL->SEESTAT.bit.SBLK, virtual_eeprom_size); + return virtual_eeprom_size; +} + +uint8_t eeprom_read_byte(const uint8_t *addr) { + uintptr_t offset = (uintptr_t)addr; + if (offset >= MAX(EEPROM_SIZE, get_virtual_eeprom_size())) { + eeprom_printf("eeprom_read_byte:: out of bounds\n"); + return 0x0; + } + + if (get_virtual_eeprom_size() == 0) { + return buffer[offset]; + } + + if (eeprom_is_busy()) { + eeprom_printf("eeprom_write_byte:: timeout\n"); + return 0x0; + } + + return SmartEEPROM8[offset]; +} + +void eeprom_write_byte(uint8_t *addr, uint8_t value) { + uintptr_t offset = (uintptr_t)addr; + if (offset >= MAX(EEPROM_SIZE, get_virtual_eeprom_size())) { + eeprom_printf("eeprom_write_byte:: out of bounds\n"); + return; + } + + if (get_virtual_eeprom_size() == 0) { + buffer[offset] = value; + return; + } + + if (eeprom_is_busy()) { + eeprom_printf("eeprom_write_byte:: timeout\n"); + return; + } + + SmartEEPROM8[offset] = value; +} + +uint16_t eeprom_read_word(const uint16_t *addr) { + const uint8_t *p = (const uint8_t *)addr; + return eeprom_read_byte(p) | (eeprom_read_byte(p + 1) << 8); +} + +uint32_t eeprom_read_dword(const uint32_t *addr) { + const uint8_t *p = (const uint8_t *)addr; + return eeprom_read_byte(p) | (eeprom_read_byte(p + 1) << 8) | (eeprom_read_byte(p + 2) << 16) | (eeprom_read_byte(p + 3) << 24); +} + +void eeprom_read_block(void *buf, const void *addr, size_t len) { + const uint8_t *p = (const uint8_t *)addr; + uint8_t * dest = (uint8_t *)buf; + while (len--) { + *dest++ = eeprom_read_byte(p++); + } +} + +void eeprom_write_word(uint16_t *addr, uint16_t value) { + uint8_t *p = (uint8_t *)addr; + eeprom_write_byte(p++, value); + eeprom_write_byte(p, value >> 8); +} + +void eeprom_write_dword(uint32_t *addr, uint32_t value) { + uint8_t *p = (uint8_t *)addr; + eeprom_write_byte(p++, value); + eeprom_write_byte(p++, value >> 8); + eeprom_write_byte(p++, value >> 16); + eeprom_write_byte(p, value >> 24); +} + +void eeprom_write_block(const void *buf, void *addr, size_t len) { + uint8_t * p = (uint8_t *)addr; + const uint8_t *src = (const uint8_t *)buf; + while (len--) { + eeprom_write_byte(p++, *src++); + } +} + +void eeprom_update_byte(uint8_t *addr, uint8_t value) { eeprom_write_byte(addr, value); } + +void eeprom_update_word(uint16_t *addr, uint16_t value) { + uint8_t *p = (uint8_t *)addr; + eeprom_write_byte(p++, value); + eeprom_write_byte(p, value >> 8); +} + +void eeprom_update_dword(uint32_t *addr, uint32_t value) { + uint8_t *p = (uint8_t *)addr; + eeprom_write_byte(p++, value); + eeprom_write_byte(p++, value >> 8); + eeprom_write_byte(p++, value >> 16); + eeprom_write_byte(p, value >> 24); +} + +void eeprom_update_block(const void *buf, void *addr, size_t len) { + uint8_t * p = (uint8_t *)addr; + const uint8_t *src = (const uint8_t *)buf; + while (len--) { + eeprom_write_byte(p++, *src++); + } +} |