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