Source code for the Trusted Boot Module.
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tbm-mcu/source/drivers/spi_flash.c

156 lines
3.3 KiB

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <flash.h>
#include <macros.h>
#include <spi.h>
#include <spi_flash.h>
static size_t spi_flash_get_size(struct flash_dev *dev);
static size_t spi_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
size_t len);
static size_t spi_flash_write(struct flash_dev *dev, uint32_t addr,
const void *data, size_t len);
static int spi_flash_erase(struct flash_dev *dev, uint32_t addr);
static void spi_flash_release(struct flash_dev *dev);
static struct flash_ops spi_flash_ops = {
.release = spi_flash_release,
.get_size = spi_flash_get_size,
.read = spi_flash_read,
.write = spi_flash_write,
.erase = spi_flash_erase,
};
static void spi_flash_addr(char *cmd, uint32_t addr)
{
cmd[1] = addr >> 16;
cmd[2] = addr >> 8;
cmd[3] = addr;
}
static void spi_flash_write_enable(struct flash_dev *dev)
{
char cmd[1] = { SPI_FLASH_WRITE_ENABLE };
struct spi_dev *spi_dev = dev->priv;
spi_tx_rx(spi_dev, NULL, 0, cmd, sizeof cmd);
}
static void spi_flash_write_disable(struct flash_dev *dev)
{
char cmd[1] = { SPI_FLASH_WRITE_DISABLE };
struct spi_dev *spi_dev = dev->priv;
spi_tx_rx(spi_dev, NULL, 0, cmd, sizeof cmd);
}
static size_t spi_flash_get_jedec_id(struct flash_dev *dev, uint8_t *jedec_id,
size_t len)
{
uint8_t cmd[1] = { SPI_FLASH_JEDEC_ID };
uint8_t buf[6];
struct spi_dev *spi_dev = dev->priv;
spi_tx_rx(spi_dev, buf, sizeof buf, cmd, sizeof cmd);
memcpy(jedec_id, buf + 1, min(sizeof buf, len));
return len;
}
static size_t spi_flash_get_size(struct flash_dev *dev)
{
uint8_t jedec_id[4];
spi_flash_get_jedec_id(dev, jedec_id, sizeof jedec_id);
printf("%02x%02x%02x%02x\n", jedec_id[0], jedec_id[1], jedec_id[2], jedec_id[3]);
return SPI_FLASH_SIZE(jedec_id[2]);
}
static size_t spi_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
size_t len)
{
char cmd[4] = { SPI_FLASH_READ };
struct spi_dev *spi_dev = dev->priv;
spi_flash_addr(cmd, addr);
spi_set_cs_level(spi_dev, 0);
spi_tx_rx(spi_dev, data, len, cmd, sizeof cmd);
spi_set_cs_level(spi_dev, 1);
return len;
}
static size_t spi_flash_write(struct flash_dev *dev, uint32_t addr,
const void *data, size_t len)
{
char cmd[4 + len];
struct spi_dev *spi_dev = dev->priv;
spi_flash_write_enable(dev);
cmd[0] = SPI_FLASH_PAGE_PROGRAM;
spi_flash_addr(cmd, addr);
memcpy(cmd + 4, data, len);
spi_set_cs_level(spi_dev, 0);
spi_tx_rx(spi_dev, NULL, 0, cmd, sizeof cmd);
spi_set_cs_level(spi_dev, 1);
spi_flash_write_disable(dev);
return len;
}
static int spi_flash_erase(struct flash_dev *dev, uint32_t addr)
{
char cmd[4];
struct spi_dev *spi_dev = dev->priv;
spi_flash_write_enable(dev);
cmd[0] = SPI_FLASH_ERASE_4K;
spi_flash_addr(cmd, addr << dev->log2_block_size);
spi_set_cs_level(spi_dev, 0);
spi_tx_rx(spi_dev, NULL, 0, cmd, sizeof cmd);
spi_set_cs_level(spi_dev, 1);
spi_flash_write_disable(dev);
return 0;
}
struct flash_dev *flash_probe(void)
{
struct flash_dev *dev;
if (!(dev = malloc(sizeof *dev)))
return NULL;
if (!(dev->priv = spi_probe()))
goto err_free_dev;
dev->ops = &spi_flash_ops;
return dev;
err_free_dev:
free(dev);
return NULL;
}
static void spi_flash_release(struct flash_dev *dev)
{
if (!dev)
return;
spi_release(dev->priv);
free(dev);
}