diff options
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++); +    } +} | 
