Emulated SPI FLASH driver for the sim target from Ken Pettit

arch/sim/Kconfig

@@ -114,4 +114,79 @@ config SIM_TCNWAITERS
 		The maximum number of threads that can be waiting on poll() for a touchscreen event.
 		Default: 4
 
+config SIM_SPIFLASH
+	bool "Simulated SPI FLASH with SMARTFS"
+	default n
+	select FS_SMARTFS
+	select MTD_SMART
+	---help---
+		Adds a simulated SPI FLASH that responds to standard M25 style
+		commands on the SPI bus.
+
+choice
+	prompt "Simulated SPI FLASH Size"
+	default SIM_SPIFLASH_1M
+	depends on SIM_SPIFLASH
+
+config SIM_SPIFLASH_1M
+	bool "1 MBit (128K Byte)"
+
+config SIM_SPIFLASH_8M
+	bool "8 MBit (1M Byte)"
+
+config SIM_SPIFLASH_32M
+	bool "32 MBit (4M Byte)"
+
+config SIM_SPIFLASH_64M
+	bool "64 MBit (8M Byte)"
+
+config SIM_SPIFLASH_128M
+	bool "128 MBit (16M Byte)"
+
+endchoice
+
+config SIM_SPIFLASH_MANUFACTURER
+	hex "Hex ID of the FLASH manufacturer code"
+	default 0x20
+	depends on SIM_SPIFLASH
+	---help---
+		Allows the simulated FLASH Manufacturer ID to be set.
+
+config SIM_SPIFLASH_MEMORY_TYPE
+	hex "Hex ID of the FLASH Memory Type code"
+	default 0x20
+	depends on SIM_SPIFLASH
+	---help---
+		Allows the simulated FLASH Memory Type code to be set.
+
+config SIM_SPIFLASH_SECTORSIZE
+	int "FLASH Sector Erase Size"
+	default 65536
+	depends on SIM_SPIFLASH
+	---help---
+		Sets the large sector erase size that the part simulates.
+		This driver simulates SPI devices that have both a large
+		sector erase as well as a "sub-sector" (per the datasheet)
+		erase size (typically 4K bytes).
+
+config SIM_SPIFLASH_SUBSECTORSIZE
+	int "FLASH Sub-Sector Erase Size"
+	default 4096
+	depends on SIM_SPIFLASH
+	---help---
+		Sets the smaller sub-sector erase size supported by the
+		FLASH emulation
+
+config SIM_SPIFLASH_PAGESIZE
+	int "FLASH Write / Program Page Size
+	default 256
+	depends on SIM_SPIFLASH
+	---help---
+		Sets the size of a page program operation.  The page size
+		represents the maximum number of bytes that can be sent
+		for a program operation.  If more bytes than this are
+		sent on a single Page Program, then the address will
+		"wrap" causing the initial data sent to be overwritten.
+		This is consistent with standard SPI FLASH operation.
+
 endif

arch/sim/src/Makefile

@@ -43,7 +43,7 @@ AOBJS = $(ASRCS:.S=$(OBJEXT))
 CSRCS  = up_initialize.c up_idle.c up_interruptcontext.c up_initialstate.c
 CSRCS += up_createstack.c up_usestack.c up_releasestack.c up_stackframe.c
 CSRCS += up_unblocktask.c up_blocktask.c up_releasepending.c
-CSRCS += up_reprioritizertr.c up_exit.c up_schedulesigaction.c
+CSRCS += up_reprioritizertr.c up_exit.c up_schedulesigaction.c up_spiflash.c
 CSRCS += up_allocateheap.c up_devconsole.c
 
 HOSTSRCS = up_stdio.c up_hostusleep.c

arch/sim/src/up_initialize.c

@@ -43,6 +43,8 @@
 
 #include <nuttx/arch.h>
 #include <nuttx/fs/fs.h>
+#include <nuttx/fs/ioctl.h>
+#include <nuttx/mtd/mtd.h>
 #include <nuttx/syslog/ramlog.h>
 
 #include "up_internal.h"
@@ -59,6 +61,32 @@
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: up_init_smartfs
+ *
+ * Description:
+ *   Initialize a simulated SPI FLASH block device m25p MTD driver and bind
+ *   it to a SMART Flash block device.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_FS_SMARTFS) && defined(CONFIG_SIM_SPIFLASH)
+static void up_init_smartfs(void)
+{
+  FAR struct mtd_dev_s *mtd;
+  FAR struct spi_dev_s *spi;
+
+  /* Initialize a simulated SPI FLASH block device m25p MTD driver */
+
+  spi = up_spiflashinitialize();
+  mtd = m25p_initialize(spi);
+
+  /* Now initialize a SMART Flash block device and bind it to the MTD device */
+
+  smart_initialize(0, mtd, NULL);
+}
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -130,4 +158,8 @@ void up_initialize(void)
 #ifdef CONFIG_NET
   netdriver_init();         /* Our "real" network driver */
 #endif
+
+#if defined(CONFIG_FS_SMARTFS) && defined(CONFIG_SIM_SPIFLASH)
+  up_init_smartfs();
+#endif
 }

arch/sim/src/up_internal.h

@@ -236,5 +236,9 @@ int netdriver_setmacaddr(unsigned char *macaddr);
 void netdriver_loop(void);
 #endif
 
+#ifdef CONFIG_SIM_SPIFLASH
+struct spi_dev_s *up_spiflashinitialize(void);
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* __ARCH_UP_INTERNAL_H */