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mtd: spi-nor: add the framework for SPI NOR

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This patch cloned most of the m25p80.c. In theory, it adds a new spi-nor layer.

Before this patch, the layer is like:

                   MTD
         ------------------------
                  m25p80
         ------------------------
	       spi bus driver
         ------------------------
	        SPI NOR chip

After this patch, the layer is like:
                   MTD
         ------------------------
                  spi-nor
         ------------------------
                  m25p80
         ------------------------
	       spi bus driver
         ------------------------
	       SPI NOR chip

With the spi-nor controller driver(Freescale Quadspi), it looks like:
                   MTD
         ------------------------
                  spi-nor
         ------------------------
                fsl-quadspi
         ------------------------
	       SPI NOR chip

New APIs:
   spi_nor_scan: used to scan a spi-nor flash.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
[Brian: rebased to include additional m25p_ids[] entry]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2014-02-24 18:37:37 +08:00 committed by Brian Norris
parent 6e602ef733
commit b199489d37
6 changed files with 1118 additions and 0 deletions
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2
drivers/mtd/Kconfig
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@ -321,6 +321,8 @@ source "drivers/mtd/onenand/Kconfig"
source "drivers/mtd/lpddr/Kconfig"
source "drivers/mtd/spi-nor/Kconfig"
source "drivers/mtd/ubi/Kconfig"
endif # MTD

1
drivers/mtd/Makefile
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@ -32,4 +32,5 @@ inftl-objs := inftlcore.o inftlmount.o
obj-y += chips/ lpddr/ maps/ devices/ nand/ onenand/ tests/
obj-$(CONFIG_MTD_SPI_NOR_BASE) += spi-nor/
obj-$(CONFIG_MTD_UBI) += ubi/

6
drivers/mtd/spi-nor/Kconfig Normal file
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@ -0,0 +1,6 @@
config MTD_SPI_NOR_BASE
bool "the framework for SPI-NOR support"
depends on MTD
help
This is the framework for the SPI NOR which can be used by the SPI
device drivers and the SPI-NOR device driver.

1
drivers/mtd/spi-nor/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_MTD_SPI_NOR_BASE) += spi-nor.o

1088
drivers/mtd/spi-nor/spi-nor.c Normal file
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File diff suppressed because it is too large Load Diff

20
include/linux/mtd/spi-nor.h
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@ -162,4 +162,24 @@ struct spi_nor {
void *priv;
};
/**
* spi_nor_scan() - scan the SPI NOR
* @nor: the spi_nor structure
* @id: the spi_device_id provided by the driver
* @mode: the read mode supported by the driver
*
* The drivers can use this fuction to scan the SPI NOR.
* In the scanning, it will try to get all the necessary information to
* fill the mtd_info{} and the spi_nor{}.
*
* The board may assigns a spi_device_id with @id which be used to compared with
* the spi_device_id detected by the scanning.
*
* Return: 0 for success, others for failure.
*/
int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id,
enum read_mode mode);
extern const struct spi_device_id spi_nor_ids[];
#endif