On 24/03/21 12:17AM, Michael Walle wrote: > Am 2021-03-11 20:12, schrieb Pratyush Yadav: > > Currently the spi_mem_op to read from the flash is used in two places: > > spi_nor_create_read_dirmap() and spi_nor_spimem_read_data(). In a later > > commit this number will increase to three. Instead of repeating the same > > code thrice, add a function that returns a template of the read op. The > > callers can then fill in the details like address, data length, data > > buffer location. > > > > Signed-off-by: Pratyush Yadav <[email protected]> > > --- > > drivers/mtd/spi-nor/core.c | 62 ++++++++++++++++++++------------------ > > 1 file changed, 32 insertions(+), 30 deletions(-) > > > > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c > > index 4a315cb1c4db..88888df009f0 100644 > > --- a/drivers/mtd/spi-nor/core.c > > +++ b/drivers/mtd/spi-nor/core.c > > @@ -183,6 +183,33 @@ static int spi_nor_controller_ops_erase(struct > > spi_nor *nor, loff_t offs) > > return nor->controller_ops->erase(nor, offs); > > } > > > > +/** > > + * spi_nor_spimem_get_read_op() - return a template for the spi_mem_op > > used for > > + * reading data from the flash via > > spi-mem. > > + * @nor: pointer to 'struct spi_nor' > > + * > > + * Return: A template of the 'struct spi_mem_op' for used for reading > > data from > > + * the flash. The caller is expected to fill in the address, data > > length, and > > + * the data buffer. > > + */ > > +static struct spi_mem_op spi_nor_spimem_get_read_op(struct spi_nor > > *nor) > > +{ > > + struct spi_mem_op op = > > + SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 0), > > + SPI_MEM_OP_ADDR(nor->addr_width, 0, 0), > > + SPI_MEM_OP_DUMMY(nor->read_dummy, 0), > > + SPI_MEM_OP_DATA_IN(1, NULL, 0)); > > + > > + spi_nor_spimem_setup_op(nor, &op, nor->read_proto); > > + > > + /* convert the dummy cycles to the number of bytes */ > > + op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8; > > + if (spi_nor_protocol_is_dtr(nor->read_proto)) > > + op.dummy.nbytes *= 2; > > + > > + return op; > > +} > > + > > /** > > * spi_nor_spimem_read_data() - read data from flash's memory region > > via > > * spi-mem > > @@ -196,21 +223,14 @@ static int spi_nor_controller_ops_erase(struct > > spi_nor *nor, loff_t offs) > > static ssize_t spi_nor_spimem_read_data(struct spi_nor *nor, loff_t > > from, > > size_t len, u8 *buf) > > { > > - struct spi_mem_op op = > > - SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 0), > > - SPI_MEM_OP_ADDR(nor->addr_width, from, 0), > > - SPI_MEM_OP_DUMMY(nor->read_dummy, 0), > > - SPI_MEM_OP_DATA_IN(len, buf, 0)); > > + struct spi_mem_op op = spi_nor_spimem_get_read_op(nor); > > bool usebouncebuf; > > ssize_t nbytes; > > int error; > > > > - spi_nor_spimem_setup_op(nor, &op, nor->read_proto); > > - > > - /* convert the dummy cycles to the number of bytes */ > > - op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8; > > - if (spi_nor_protocol_is_dtr(nor->read_proto)) > > - op.dummy.nbytes *= 2; > > + op.addr.val = from; > > + op.data.nbytes = len; > > + op.data.buf.in = buf; > > > > usebouncebuf = spi_nor_spimem_bounce(nor, &op); > > > > @@ -3581,28 +3601,10 @@ EXPORT_SYMBOL_GPL(spi_nor_scan); > > static int spi_nor_create_read_dirmap(struct spi_nor *nor) > > { > > struct spi_mem_dirmap_info info = { > > - .op_tmpl = SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 0), > > - SPI_MEM_OP_ADDR(nor->addr_width, 0, 0), > > - SPI_MEM_OP_DUMMY(nor->read_dummy, 0), > > - SPI_MEM_OP_DATA_IN(0, NULL, 0)), > > + .op_tmpl = spi_nor_spimem_get_read_op(nor), > > .offset = 0, > > .length = nor->mtd.size, > > }; > > - struct spi_mem_op *op = &info.op_tmpl; > > - > > - spi_nor_spimem_setup_op(nor, op, nor->read_proto); > > - > > - /* convert the dummy cycles to the number of bytes */ > > - op->dummy.nbytes = (nor->read_dummy * op->dummy.buswidth) / 8; > > - if (spi_nor_protocol_is_dtr(nor->read_proto)) > > - op->dummy.nbytes *= 2; > > - > > - /* > > - * Since spi_nor_spimem_setup_op() only sets buswidth when the number > > - * of data bytes is non-zero, the data buswidth won't be set here. So, > > - * do it explicitly. > > - */ > > - op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto); > > I guess this isn't needed anymore because spi_nor_spimem_get_read_op() uses > a > data length of 1, right?
Yes. > > > > > nor->dirmap.rdesc = devm_spi_mem_dirmap_create(nor->dev, nor->spimem, > > &info); > > -michael -- Regards, Pratyush Yadav Texas Instruments Inc.
