From: Ashok Reddy Soma ashok.reddy.soma@amd.com
Add support for parallel memories flash configuration in read status register and read flag status register functions.
Signed-off-by: Ashok Reddy Soma ashok.reddy.soma@amd.com Signed-off-by: Venkatesh Yadav Abbarapu venkatesh.abbarapu@amd.com --- drivers/mtd/spi/spi-nor-core.c | 50 ++++++++++++++++++++++++---------- 1 file changed, 36 insertions(+), 14 deletions(-)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index b2e5494e78..373979d19b 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -438,8 +438,9 @@ static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len, }
/* - * Read the status register, returning its value in the location - * Return the status register value. + * Return the status register value. If the chip is parallel, then the + * read will be striped, so we should read 2 bytes to get the sr + * register value from both of the parallel chips. * Returns negative if error occurred. */ static int read_sr(struct spi_nor *nor) @@ -471,18 +472,29 @@ static int read_sr(struct spi_nor *nor) if (spi_nor_protocol_is_dtr(nor->reg_proto)) op.data.nbytes = 2;
- ret = spi_nor_read_write_reg(nor, &op, val); - if (ret < 0) { - pr_debug("error %d reading SR\n", (int)ret); - return ret; + if (nor->flags & SNOR_F_HAS_PARALLEL) { + op.data.nbytes = 2; + ret = spi_nor_read_write_reg(nor, &op, &val[0]); + if (ret < 0) { + pr_debug("error %d reading SR\n", (int)ret); + return ret; + } + val[0] |= val[1]; + } else { + ret = spi_nor_read_write_reg(nor, &op, &val[0]); + if (ret < 0) { + pr_debug("error %d reading SR\n", (int)ret); + return ret; + } }
- return *val; + return val[0]; }
/* - * Read the flag status register, returning its value in the location - * Return the status register value. + * Return the flag status register value. If the chip is parallel, then + * the read will be striped, so we should read 2 bytes to get the fsr + * register value from both of the parallel chips. * Returns negative if error occurred. */ static int read_fsr(struct spi_nor *nor) @@ -514,13 +526,23 @@ static int read_fsr(struct spi_nor *nor) if (spi_nor_protocol_is_dtr(nor->reg_proto)) op.data.nbytes = 2;
- ret = spi_nor_read_write_reg(nor, &op, val); - if (ret < 0) { - pr_debug("error %d reading FSR\n", ret); - return ret; + if (nor->flags & SNOR_F_HAS_PARALLEL) { + op.data.nbytes = 2; + ret = spi_nor_read_write_reg(nor, &op, &val[0]); + if (ret < 0) { + pr_debug("error %d reading SR\n", (int)ret); + return ret; + } + val[0] &= val[1]; + } else { + ret = spi_nor_read_write_reg(nor, &op, &val[0]); + if (ret < 0) { + pr_debug("error %d reading FSR\n", ret); + return ret; + } }
- return *val; + return val[0]; }
/*