[PATCH 7/8] mtd: spi-nor: use spi-mem dirmap API
Pratyush Yadav
p.yadav at ti.com
Wed Apr 20 10:21:12 CEST 2022
On 14/04/22 07:23PM, Chin-Ting Kuo wrote:
> This adds support for the dirmap API to the spi-nor subsystem, as
> introduced in Linux commit df5c210 ("mtd: spi-nor: use spi-mem
> dirmap API").
>
> This patch is synchronize from the following patch
> https://patchwork.ozlabs.org/project/uboot/patch/20210205043924.149504-4-seanga2@gmail.com/
>
> Signed-off-by: Chin-Ting Kuo <chin-ting_kuo at aspeedtech.com>
> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
> ---
> drivers/mtd/spi/sf_probe.c | 82 ++++++++++++++++++++++++++++++++++
> drivers/mtd/spi/spi-nor-core.c | 55 ++++++++++++++++-------
> include/linux/mtd/spi-nor.h | 18 ++++++++
> 3 files changed, 139 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
> index f461082e03..a3b38b6a29 100644
> --- a/drivers/mtd/spi/sf_probe.c
> +++ b/drivers/mtd/spi/sf_probe.c
> @@ -10,13 +10,81 @@
> #include <common.h>
> #include <dm.h>
> #include <errno.h>
> +#include <linux/mtd/spi-nor.h>
> #include <log.h>
> #include <malloc.h>
> #include <spi.h>
> #include <spi_flash.h>
> +#include <spi-mem.h>
>
> #include "sf_internal.h"
>
> +#if CONFIG_IS_ENABLED(SPI_DIRMAP)
> +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)),
> + .offset = 0,
> + .length = nor->mtd.size,
> + };
> + struct spi_mem_op *op = &info.op_tmpl;
> +
> + /* get transfer protocols. */
> + spi_nor_setup_op(nor, op, nor->read_proto);
> + op->data.buswidth = spi_nor_get_protocol_data_nbits(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;
> +
> + nor->dirmap.rdesc = spi_mem_dirmap_create(nor->spi, &info);
> + if (IS_ERR(nor->dirmap.rdesc))
> + return PTR_ERR(nor->dirmap.rdesc);
> +
> + return 0;
> +}
> +
> +static int spi_nor_create_write_dirmap(struct spi_nor *nor)
> +{
> + struct spi_mem_dirmap_info info = {
> + .op_tmpl = SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 0),
> + SPI_MEM_OP_ADDR(nor->addr_width, 0, 0),
> + SPI_MEM_OP_NO_DUMMY,
> + SPI_MEM_OP_DATA_OUT(0, NULL, 0)),
> + .offset = 0,
> + .length = nor->mtd.size,
> + };
> + struct spi_mem_op *op = &info.op_tmpl;
> +
> + /* get transfer protocols. */
> + spi_nor_setup_op(nor, op, nor->write_proto);
> + op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
> +
> + if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
> + op->addr.nbytes = 0;
> +
> + nor->dirmap.wdesc = spi_mem_dirmap_create(nor->spi, &info);
> + if (IS_ERR(nor->dirmap.wdesc))
> + return PTR_ERR(nor->dirmap.wdesc);
> +
> + return 0;
> +}
> +#else
> +static int spi_nor_create_read_dirmap(struct spi_nor *nor)
> +{
> + return 0;
> +}
> +
> +static int spi_nor_create_write_dirmap(struct spi_nor *nor)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_SPI_DIRMAP */
> +
Instead of wrapping these in #ifdefs...
> /**
> * spi_flash_probe_slave() - Probe for a SPI flash device on a bus
> *
> @@ -45,6 +113,14 @@ static int spi_flash_probe_slave(struct spi_flash *flash)
> if (ret)
> goto err_read_id;
>
> + ret = spi_nor_create_read_dirmap(flash);
> + if (ret)
> + return ret;
> +
> + ret = spi_nor_create_write_dirmap(flash);
> + if (ret)
> + return ret;
> +
... wrap these in a
if (CONFIG_IS_ENABLED(SPI_DIRMAP)) {
// Create read and write dirmap
}
Then at compile time if the config is not enabled, this is a dead branch
and the compiler should not look at spi_nor_create_{read,write}_dirmap()
at all.
> if (CONFIG_IS_ENABLED(SPI_FLASH_MTD))
> ret = spi_flash_mtd_register(flash);
>
> @@ -83,6 +159,9 @@ struct spi_flash *spi_flash_probe(unsigned int busnum, unsigned int cs,
>
> void spi_flash_free(struct spi_flash *flash)
> {
> + spi_mem_dirmap_destroy(flash->dirmap.wdesc);
> + spi_mem_dirmap_destroy(flash->dirmap.rdesc);
> +
> if (CONFIG_IS_ENABLED(SPI_FLASH_MTD))
> spi_flash_mtd_unregister(flash);
>
> @@ -153,6 +232,9 @@ static int spi_flash_std_remove(struct udevice *dev)
> struct spi_flash *flash = dev_get_uclass_priv(dev);
> int ret;
>
> + spi_mem_dirmap_destroy(flash->dirmap.wdesc);
> + spi_mem_dirmap_destroy(flash->dirmap.rdesc);
> +
> ret = spi_nor_remove(flash);
> if (ret)
> return ret;
> diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
> index 3b7c817c02..0c6262b7fd 100644
> --- a/drivers/mtd/spi/spi-nor-core.c
> +++ b/drivers/mtd/spi/spi-nor-core.c
> @@ -239,9 +239,9 @@ static u8 spi_nor_get_cmd_ext(const struct spi_nor *nor,
> * need to be initialized.
> * @proto: the protocol from which the properties need to be set.
> */
> -static void spi_nor_setup_op(const struct spi_nor *nor,
> - struct spi_mem_op *op,
> - const enum spi_nor_protocol proto)
> +void spi_nor_setup_op(const struct spi_nor *nor,
> + struct spi_mem_op *op,
> + const enum spi_nor_protocol proto)
> {
> u8 ext;
>
> @@ -362,13 +362,29 @@ static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
>
> while (remaining) {
> op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
> - ret = spi_mem_adjust_op_size(nor->spi, &op);
> - if (ret)
> - return ret;
>
> - ret = spi_mem_exec_op(nor->spi, &op);
> - if (ret)
> - return ret;
> + if (CONFIG_IS_ENABLED(SPI_DIRMAP) && nor->dirmap.rdesc) {
> + /*
> + * Record current operation information which may be used
> + * when the address or data length exceeds address mapping.
> + */
> + memcpy(&nor->dirmap.rdesc->info.op_tmpl, &op,
> + sizeof(struct spi_mem_op));
> + ret = spi_mem_dirmap_read(nor->dirmap.rdesc,
> + op.addr.val, op.data.nbytes,
> + op.data.buf.in);
> + if (ret < 0)
> + return ret;
> + op.data.nbytes = ret;
> + } else {
> + ret = spi_mem_adjust_op_size(nor->spi, &op);
> + if (ret)
> + return ret;
> +
> + ret = spi_mem_exec_op(nor->spi, &op);
> + if (ret)
> + return ret;
> + }
>
> op.addr.val += op.data.nbytes;
> remaining -= op.data.nbytes;
> @@ -393,14 +409,21 @@ static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
>
> spi_nor_setup_op(nor, &op, nor->write_proto);
>
> - ret = spi_mem_adjust_op_size(nor->spi, &op);
> - if (ret)
> - return ret;
> - op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes;
> + if (CONFIG_IS_ENABLED(SPI_DIRMAP) && nor->dirmap.wdesc) {
> + memcpy(&nor->dirmap.wdesc->info.op_tmpl, &op,
> + sizeof(struct spi_mem_op));
> + op.data.nbytes = spi_mem_dirmap_write(nor->dirmap.wdesc, op.addr.val,
> + op.data.nbytes, op.data.buf.out);
> + } else {
> + ret = spi_mem_adjust_op_size(nor->spi, &op);
> + if (ret)
> + return ret;
> + op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes;
>
> - ret = spi_mem_exec_op(nor->spi, &op);
> - if (ret)
> - return ret;
> + ret = spi_mem_exec_op(nor->spi, &op);
> + if (ret)
> + return ret;
> + }
>
> return op.data.nbytes;
> }
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index 4ceeae623d..2a5ad09625 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -11,6 +11,7 @@
> #include <linux/bitops.h>
> #include <linux/mtd/cfi.h>
> #include <linux/mtd/mtd.h>
> +#include <spi-mem.h>
>
> /*
> * Manufacturer IDs
> @@ -511,6 +512,7 @@ struct spi_flash {
> * @quad_enable: [FLASH-SPECIFIC] enables SPI NOR quad mode
> * @octal_dtr_enable: [FLASH-SPECIFIC] enables SPI NOR octal DTR mode.
> * @ready: [FLASH-SPECIFIC] check if the flash is ready
> + * @dirmap: pointers to struct spi_mem_dirmap_desc for reads/writes.
> * @priv: the private data
> */
> struct spi_nor {
> @@ -561,6 +563,11 @@ struct spi_nor {
> int (*octal_dtr_enable)(struct spi_nor *nor);
> int (*ready)(struct spi_nor *nor);
>
> + struct {
> + struct spi_mem_dirmap_desc *rdesc;
> + struct spi_mem_dirmap_desc *wdesc;
> + } dirmap;
> +
> void *priv;
> char mtd_name[MTD_NAME_SIZE(MTD_DEV_TYPE_NOR)];
> /* Compatibility for spi_flash, remove once sf layer is merged with mtd */
> @@ -584,6 +591,17 @@ device_node *spi_nor_get_flash_node(struct spi_nor *nor)
> }
> #endif /* __UBOOT__ */
>
> +/**
> + * spi_nor_setup_op() - Set up common properties of a spi-mem op.
> + * @nor: pointer to a 'struct spi_nor'
> + * @op: pointer to the 'struct spi_mem_op' whose properties
> + * need to be initialized.
> + * @proto: the protocol from which the properties need to be set.
> + */
> +void spi_nor_setup_op(const struct spi_nor *nor,
> + struct spi_mem_op *op,
> + const enum spi_nor_protocol proto);
> +
> /**
> * spi_nor_scan() - scan the SPI NOR
> * @nor: the spi_nor structure
> --
> 2.25.1
>
--
Regards,
Pratyush Yadav
Texas Instruments Inc.
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