diff options
Diffstat (limited to 'drivers/flash')
| -rw-r--r-- | drivers/flash/flash_spi.c | 376 | ||||
| -rw-r--r-- | drivers/flash/flash_spi.h | 136 |
2 files changed, 512 insertions, 0 deletions
diff --git a/drivers/flash/flash_spi.c b/drivers/flash/flash_spi.c new file mode 100644 index 0000000000..f4cbf65159 --- /dev/null +++ b/drivers/flash/flash_spi.c @@ -0,0 +1,376 @@ +/* +Copyright (C) 2021 Westberry Technology (ChangZhou) Corp., Ltd + +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 <string.h> + +#include "util.h" +#include "wait.h" +#include "debug.h" +#include "timer.h" +#include "flash_spi.h" +#include "spi_master.h" + +/* + The time-out time of spi flash transmission. +*/ +#ifndef EXTERNAL_FLASH_SPI_TIMEOUT +# define EXTERNAL_FLASH_SPI_TIMEOUT 1000 +#endif + +/* ID comands */ +#define FLASH_CMD_RDID 0x9F /* RDID (Read Identification) */ +#define FLASH_CMD_RES 0xAB /* RES (Read Electronic ID) */ +#define FLASH_CMD_REMS 0x90 /* REMS (Read Electronic & Device ID) */ + +/* register comands */ +#define FLASH_CMD_WRSR 0x01 /* WRSR (Write Status register) */ +#define FLASH_CMD_RDSR 0x05 /* RDSR (Read Status register) */ + +/* READ comands */ +#define FLASH_CMD_READ 0x03 /* READ (1 x I/O) */ +#define FLASH_CMD_FASTREAD 0x0B /* FAST READ (Fast read data) */ +#define FLASH_CMD_DREAD 0x3B /* DREAD (1In/2 Out fast read) */ + +/* Program comands */ +#define FLASH_CMD_WREN 0x06 /* WREN (Write Enable) */ +#define FLASH_CMD_WRDI 0x04 /* WRDI (Write Disable) */ +#define FLASH_CMD_PP 0x02 /* PP (page program) */ + +/* Erase comands */ +#define FLASH_CMD_SE 0x20 /* SE (Sector Erase) */ +#define FLASH_CMD_BE 0xD8 /* BE (Block Erase) */ +#define FLASH_CMD_CE 0x60 /* CE (Chip Erase) hex code: 60 or C7 */ + +/* Mode setting comands */ +#define FLASH_CMD_DP 0xB9 /* DP (Deep Power Down) */ +#define FLASH_CMD_RDP 0xAB /* RDP (Release form Deep Power Down) */ + +/* Status register */ +#define FLASH_FLAG_WIP 0x01 /* Write in progress bit */ +#define FLASH_FLAG_WEL 0x02 /* Write enable latch bit */ + +// #define DEBUG_FLASH_SPI_OUTPUT + +static bool spi_flash_start(void) { + return spi_start(EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN, EXTERNAL_FLASH_SPI_LSBFIRST, EXTERNAL_FLASH_SPI_MODE, EXTERNAL_FLASH_SPI_CLOCK_DIVISOR); +} + +static flash_status_t spi_flash_wait_while_busy(void) { + uint32_t deadline = timer_read32() + EXTERNAL_FLASH_SPI_TIMEOUT; + flash_status_t response = FLASH_STATUS_SUCCESS; + uint8_t retval; + + do { + bool res = spi_flash_start(); + if (!res) { + dprint("Failed to start SPI! [spi flash wait while busy]\n"); + return FLASH_STATUS_ERROR; + } + + spi_write(FLASH_CMD_RDSR); + + retval = (uint8_t)spi_read(); + + spi_stop(); + + if (timer_read32() >= deadline) { + response = FLASH_STATUS_TIMEOUT; + break; + } + } while (retval & FLASH_FLAG_WIP); + + return response; +} + +static flash_status_t spi_flash_write_enable(void) { + bool res = spi_flash_start(); + if (!res) { + dprint("Failed to start SPI! [spi flash write enable]\n"); + return FLASH_STATUS_ERROR; + } + + spi_write(FLASH_CMD_WREN); + + spi_stop(); + + return FLASH_STATUS_SUCCESS; +} + +static flash_status_t spi_flash_write_disable(void) { + bool res = spi_flash_start(); + if (!res) { + dprint("Failed to start SPI! [spi flash write disable]\n"); + return FLASH_STATUS_ERROR; + } + + spi_write(FLASH_CMD_WRDI); + + spi_stop(); + + return FLASH_STATUS_SUCCESS; +} + +/* This function is used for read transfer, write transfer and erase transfer. */ +static flash_status_t spi_flash_transaction(uint8_t cmd, uint32_t addr, uint8_t *data, size_t len) { + flash_status_t response = FLASH_STATUS_SUCCESS; + uint8_t buffer[EXTERNAL_FLASH_ADDRESS_SIZE + 1]; + + buffer[0] = cmd; + for (int i = 0; i < EXTERNAL_FLASH_ADDRESS_SIZE; ++i) { + buffer[EXTERNAL_FLASH_ADDRESS_SIZE - i] = addr & 0xFF; + addr >>= 8; + } + + bool res = spi_flash_start(); + if (!res) { + dprint("Failed to start SPI! [spi flash transmit]\n"); + return FLASH_STATUS_ERROR; + } + + response = spi_transmit(buffer, sizeof(buffer)); + + if ((!response) && (data != NULL)) { + switch (cmd) { + case FLASH_CMD_READ: + response = spi_receive(data, len); + break; + case FLASH_CMD_PP: + response = spi_transmit(data, len); + break; + default: + response = FLASH_STATUS_ERROR; + break; + } + } + + spi_stop(); + + return response; +} + +void flash_init(void) { + spi_init(); +} + +flash_status_t flash_erase_chip(void) { + flash_status_t response = FLASH_STATUS_SUCCESS; + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase chip]\n"); + return response; + } + + /* Enable writes. */ + response = spi_flash_write_enable(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write-enable! [spi flash erase chip]\n"); + return response; + } + + /* Erase Chip. */ + bool res = spi_flash_start(); + if (!res) { + dprint("Failed to start SPI! [spi flash erase chip]\n"); + return FLASH_STATUS_ERROR; + } + spi_write(FLASH_CMD_CE); + spi_stop(); + + /* Wait for the write-in-progress bit to be cleared.*/ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase chip]\n"); + return response; + } + + return response; +} + +flash_status_t flash_erase_sector(uint32_t addr) { + flash_status_t response = FLASH_STATUS_SUCCESS; + + /* Check that the address exceeds the limit. */ + if ((addr + (EXTERNAL_FLASH_SECTOR_SIZE)) >= (EXTERNAL_FLASH_SIZE) || ((addr % (EXTERNAL_FLASH_SECTOR_SIZE)) != 0)) { + dprintf("Flash erase sector address over limit! [addr:0x%x]\n", (uint32_t)addr); + return FLASH_STATUS_ERROR; + } + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase sector]\n"); + return response; + } + + /* Enable writes. */ + response = spi_flash_write_enable(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write-enable! [spi flash erase sector]\n"); + return response; + } + + /* Erase Sector. */ + response = spi_flash_transaction(FLASH_CMD_SE, addr, NULL, 0); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to erase sector! [spi flash erase sector]\n"); + return response; + } + + /* Wait for the write-in-progress bit to be cleared.*/ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase sector]\n"); + return response; + } + + return response; +} + +flash_status_t flash_erase_block(uint32_t addr) { + flash_status_t response = FLASH_STATUS_SUCCESS; + + /* Check that the address exceeds the limit. */ + if ((addr + (EXTERNAL_FLASH_BLOCK_SIZE)) >= (EXTERNAL_FLASH_SIZE) || ((addr % (EXTERNAL_FLASH_BLOCK_SIZE)) != 0)) { + dprintf("Flash erase block address over limit! [addr:0x%x]\n", (uint32_t)addr); + return FLASH_STATUS_ERROR; + } + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase block]\n"); + return response; + } + + /* Enable writes. */ + response = spi_flash_write_enable(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write-enable! [spi flash erase block]\n"); + return response; + } + + /* Erase Block. */ + response = spi_flash_transaction(FLASH_CMD_BE, addr, NULL, 0); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to erase block! [spi flash erase block]\n"); + return response; + } + + /* Wait for the write-in-progress bit to be cleared.*/ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash erase block]\n"); + return response; + } + + return response; +} + +flash_status_t flash_read_block(uint32_t addr, void *buf, size_t len) { + flash_status_t response = FLASH_STATUS_SUCCESS; + uint8_t * read_buf = (uint8_t *)buf; + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash read block]\n"); + memset(read_buf, 0, len); + return response; + } + + /* Perform read. */ + response = spi_flash_transaction(FLASH_CMD_READ, addr, read_buf, len); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to read block! [spi flash read block]\n"); + memset(read_buf, 0, len); + return response; + } + +#if defined(CONSOLE_ENABLE) && defined(DEBUG_FLASH_SPI_OUTPUT) + dprintf("[SPI FLASH R] 0x%08lX: ", addr); + for (size_t i = 0; i < len; ++i) { + dprintf(" %02X", (int)(((uint8_t *)read_buf)[i])); + } + dprintf("\n"); +#endif // DEBUG_FLASH_SPI_OUTPUT + + return response; +} + +flash_status_t flash_write_block(uint32_t addr, const void *buf, size_t len) { + flash_status_t response = FLASH_STATUS_SUCCESS; + uint8_t * write_buf = (uint8_t *)buf; + + while (len > 0) { + uint32_t page_offset = addr % EXTERNAL_FLASH_PAGE_SIZE; + size_t write_length = EXTERNAL_FLASH_PAGE_SIZE - page_offset; + if (write_length > len) { + write_length = len; + } + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash write block]\n"); + return response; + } + + /* Enable writes. */ + response = spi_flash_write_enable(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write-enable! [spi flash write block]\n"); + return response; + } + +#if defined(CONSOLE_ENABLE) && defined(DEBUG_FLASH_SPI_OUTPUT) + dprintf("[SPI FLASH W] 0x%08lX: ", addr); + for (size_t i = 0; i < write_length; i++) { + dprintf(" %02X", (int)(uint8_t)(write_buf[i])); + } + dprintf("\n"); +#endif // DEBUG_FLASH_SPI_OUTPUT + + /* Perform the write. */ + response = spi_flash_transaction(FLASH_CMD_PP, addr, write_buf, write_length); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write block! [spi flash write block]\n"); + return response; + } + + write_buf += write_length; + addr += write_length; + len -= write_length; + } + + /* Wait for the write-in-progress bit to be cleared. */ + response = spi_flash_wait_while_busy(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to check WIP flag! [spi flash write block]\n"); + return response; + } + + /* Disable writes. */ + response = spi_flash_write_disable(); + if (response != FLASH_STATUS_SUCCESS) { + dprint("Failed to write-disable! [spi flash write block]\n"); + return response; + } + + return response; +} diff --git a/drivers/flash/flash_spi.h b/drivers/flash/flash_spi.h new file mode 100644 index 0000000000..abe95e955e --- /dev/null +++ b/drivers/flash/flash_spi.h @@ -0,0 +1,136 @@ +/* +Copyright (C) 2021 Westberry Technology (ChangZhou) Corp., Ltd + +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/>. +*/ + +#pragma once + +/* All the following default configurations are based on MX25L4006E Nor FLASH. */ + +/* + The slave select pin of the FLASH. + This needs to be a normal GPIO pin_t value, such as B14. +*/ +#ifndef EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN +# error "No chip select pin defined -- missing EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN" +#endif + +/* + The clock divisor for SPI to ensure that the MCU is within the + specifications of the FLASH chip. Generally this will be PCLK divided by + the intended divisor -- check your clock settings and the datasheet of + your FLASH. +*/ +#ifndef EXTERNAL_FLASH_SPI_CLOCK_DIVISOR +# ifdef __AVR__ +# define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 4 +# else +# define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 8 +# endif +#endif + +/* + The SPI mode to communicate with the FLASH. +*/ +#ifndef EXTERNAL_FLASH_SPI_MODE +# define EXTERNAL_FLASH_SPI_MODE 0 +#endif + +/* + Whether or not the SPI communication between the MCU and FLASH should be + LSB-first. +*/ +#ifndef EXTERNAL_FLASH_SPI_LSBFIRST +# define EXTERNAL_FLASH_SPI_LSBFIRST false +#endif + +/* + The Flash address size in bytes, as specified in datasheet. +*/ +#ifndef EXTERNAL_FLASH_ADDRESS_SIZE +# define EXTERNAL_FLASH_ADDRESS_SIZE 3 +#endif + +/* + The page size of the FLASH in bytes, as specified in the datasheet. +*/ +#ifndef EXTERNAL_FLASH_PAGE_SIZE +# define EXTERNAL_FLASH_PAGE_SIZE 256 +#endif + +/* + The sector size of the FLASH in bytes, as specified in the datasheet. +*/ +#ifndef EXTERNAL_FLASH_SECTOR_SIZE +# define EXTERNAL_FLASH_SECTOR_SIZE (4 * 1024) +#endif + +/* + The block size of the FLASH in bytes, as specified in the datasheet. +*/ +#ifndef EXTERNAL_FLASH_BLOCK_SIZE +# define EXTERNAL_FLASH_BLOCK_SIZE (64 * 1024) +#endif + +/* + The total size of the FLASH in bytes, as specified in the datasheet. +*/ +#ifndef EXTERNAL_FLASH_SIZE +# define EXTERNAL_FLASH_SIZE (512 * 1024) +#endif + +/* + The block count of the FLASH, calculated by total FLASH size and block size. +*/ +#define EXTERNAL_FLASH_BLOCK_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_BLOCK_SIZE)) + +/* + The sector count of the FLASH, calculated by total FLASH size and sector size. +*/ +#define EXTERNAL_FLASH_SECTOR_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_SECTOR_SIZE)) + +/* + The page count of the FLASH, calculated by total FLASH size and page size. +*/ +#define EXTERNAL_FLASH_PAGE_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_PAGE_SIZE)) + +typedef int16_t flash_status_t; + +#define FLASH_STATUS_SUCCESS (0) +#define FLASH_STATUS_ERROR (-1) +#define FLASH_STATUS_TIMEOUT (-2) +#define FLASH_STATUS_BAD_ADDRESS (-3) + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdint.h> + +void flash_init(void); + +flash_status_t flash_erase_chip(void); + +flash_status_t flash_erase_block(uint32_t addr); + +flash_status_t flash_erase_sector(uint32_t addr); + +flash_status_t flash_read_block(uint32_t addr, void *buf, size_t len); + +flash_status_t flash_write_block(uint32_t addr, const void *buf, size_t len); + +#ifdef __cplusplus +} +#endif |