drivers: flash: add a generic spi nor flash driver

This driver is inspired from the w25qxxdv SPI NOR flash driver which was
already implementing the CFI (Common Flash Interface) for its purpose.
To handle other NOR flash a flash id table (as Linux do) which contains
the geometry for a few SPI NOR flash based on their JEDEC ID has been
introduced.
We currently support the following flash:
 - W25Q80
 - W25Q16
 - W25Q32
 - S25FL216K
 - MX25UM512

The read and write functions are able to handle more then one page at a
time and return the number of bytes read or write.
Also because every NOR flash expect to disable the write protection
before writing or erasing, the write enable command is now part of the
write and erase functions.

Signed-off-by: Sebastien Bourdelin <[email protected]>
Signed-off-by: Savinay Dharmappa <[email protected]>

drivers/flash/CMakeLists.txt

@@ -1,5 +1,6 @@
 zephyr_library()
 
+zephyr_library_sources_ifdef(CONFIG_SPI_NOR spi_nor.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_FLASH_W25QXXDV spi_flash_w25qxxdv.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_QMSI soc_flash_qmsi.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NRF soc_flash_nrf.c)

drivers/flash/Kconfig

@@ -87,6 +87,8 @@ config SOC_FLASH_NIOS2_QSPI_DEV_NAME
 
 source "drivers/flash/Kconfig.gecko"
 
+source "drivers/flash/Kconfig.nor"
+
 source "drivers/flash/Kconfig.qmsi"
 
 source "drivers/flash/Kconfig.stm32"

drivers/flash/Kconfig.nor

@@ -0,0 +1,76 @@
+#
+# Copyright (c) 2018 Savoir-Faire Linux.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+
+menuconfig SPI_NOR
+	bool
+	prompt "SPI NOR Flash"
+	select FLASH_HAS_DRIVER_ENABLED
+	depends on SPI && FLASH
+
+if SPI_NOR
+
+config SPI_NOR_INIT_PRIORITY
+	int
+	default 80
+	help
+	  Device driver initialization priority.
+	  Device is connected to SPI bus, it has to
+	  be initialized after SPI driver.
+
+config SPI_NOR_JEDEC_ID
+	hex "Unique Id to identify SPI flash"
+	default 0
+	help
+	This is a unique id to identify SPI flash
+
+config SPI_NOR_PAGE_SIZE
+	int "Page size of SPI flash"
+	default 0
+	help
+	This option specifies page size of SPI flash
+
+config SPI_NOR_SECTOR_SIZE
+	int "Sector size of SPI flash"
+	default 0
+	help
+	This option specifies sector size of SPI flash
+
+config SPI_NOR_SECTORS
+	int "Number of sectors in SPI flash"
+	default 0
+	help
+	This option specifies number of sector present
+	in SPI flash
+
+config SPI_NOR_BLOCK_SIZE
+	int "Block size of SPI flash"
+	default 0
+	help
+	This option specifies block size of SPI flash
+
+choice SPI_NOR_BLOCK_ERASE_SIZE
+prompt "Select Block size for erasing"
+
+config SPI_NOR_BLOCK_ERASE_32K
+	bool "Select 32K block erase"
+	help
+	This Enables 32K Block erase
+
+config SPI_NOR_BLOCK_ERASE_64K
+	bool "Select 64K block erase"
+	help
+	This Enables 64K Block erase
+
+endchoice
+
+config SPI_NOR_BLOCK_ERASE_SIZE
+	int
+	default 2 if SPI_NOR_BLOCK_ERASE_32K
+	default 4 if SPI_NOR_BLOCK_ERASE_64K
+	help
+	This option specifies block size of SPI flash
+endif # SPI_NOR