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- --- a/drivers/mtd/spi-nor/spi-nor.c
- +++ b/drivers/mtd/spi-nor/spi-nor.c
- @@ -1014,6 +1014,66 @@ write_err:
- return ret;
- }
-
- +static int spi_nor_chunked_write(struct mtd_info *mtd, loff_t _to, size_t _len,
- + size_t *_retlen, const u_char *_buf)
- +{
- + struct spi_nor *nor = mtd_to_spi_nor(mtd);
- + int chunk_size;
- + int retlen = 0;
- + int ret;
- +
- + chunk_size = nor->chunk_size;
- + if (!chunk_size)
- + chunk_size = _len;
- +
- + if (nor->addr_width > 3)
- + chunk_size -= nor->addr_width - 3;
- +
- + while (retlen < _len) {
- + size_t len = min_t(int, chunk_size, _len - retlen);
- + const u_char *buf = _buf + retlen;
- + loff_t to = _to + retlen;
- +
- + if (nor->flags & SNOR_F_SST)
- + ret = sst_write(mtd, to, len, &retlen, buf);
- + else
- + ret = spi_nor_write(mtd, to, len, &retlen, buf);
- + if (ret)
- + return ret;
- + }
- +
- + *_retlen += retlen;
- + return 0;
- +}
- +
- +static int spi_nor_chunked_read(struct mtd_info *mtd, loff_t _from, size_t _len,
- + size_t *_retlen, u_char *_buf)
- +{
- + struct spi_nor *nor = mtd_to_spi_nor(mtd);
- + int chunk_size;
- + int ret;
- +
- + chunk_size = nor->chunk_size;
- + if (!chunk_size)
- + chunk_size = _len;
- +
- + *_retlen = 0;
- + while (*_retlen < _len) {
- + size_t len = min_t(int, chunk_size, _len - *_retlen);
- + u_char *buf = _buf + *_retlen;
- + loff_t from = _from + *_retlen;
- + int retlen = 0;
- +
- + ret = spi_nor_read(mtd, from, len, &retlen, buf);
- + if (ret)
- + return ret;
- +
- + *_retlen += retlen;
- + }
- +
- + return 0;
- +}
- +
- static int macronix_quad_enable(struct spi_nor *nor)
- {
- int ret, val;
- @@ -1194,10 +1254,12 @@ int spi_nor_scan(struct spi_nor *nor, co
- }
-
- /* sst nor chips use AAI word program */
- - if (info->flags & SST_WRITE)
- + if (info->flags & SST_WRITE) {
- mtd->_write = sst_write;
- - else
- + nor->flags |= SNOR_F_SST;
- + } else {
- mtd->_write = spi_nor_write;
- + }
-
- if (info->flags & USE_FSR)
- nor->flags |= SNOR_F_USE_FSR;
- @@ -1225,11 +1287,20 @@ int spi_nor_scan(struct spi_nor *nor, co
- mtd->writebufsize = nor->page_size;
-
- if (np) {
- + u32 val;
- +
- /* If we were instantiated by DT, use it */
- if (of_property_read_bool(np, "m25p,fast-read"))
- nor->flash_read = SPI_NOR_FAST;
- else
- nor->flash_read = SPI_NOR_NORMAL;
- +
- + if (!of_property_read_u32(np, "m25p,chunked-io", &val)) {
- + dev_info(dev, "using chunked io (size=%d)\n", val);
- + mtd->_read = spi_nor_chunked_read;
- + mtd->_write = spi_nor_chunked_write;
- + nor->chunk_size = val;
- + }
- } else {
- /* If we weren't instantiated by DT, default to fast-read */
- nor->flash_read = SPI_NOR_FAST;
- --- a/include/linux/mtd/spi-nor.h
- +++ b/include/linux/mtd/spi-nor.h
- @@ -116,6 +116,7 @@ enum spi_nor_ops {
-
- enum spi_nor_option_flags {
- SNOR_F_USE_FSR = BIT(0),
- + SNOR_F_SST = BIT(1),
- };
-
- /**
- @@ -156,6 +157,7 @@ struct spi_nor {
- struct device *dev;
- struct device_node *flash_node;
- u32 page_size;
- + u16 chunk_size;
- u8 addr_width;
- u8 erase_opcode;
- u8 read_opcode;
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