dfu: sf: add partition support for nor backend

Copy the partition support from NAND backend to SF,
support part and partubi option.
In case of ubi partition, erase the rest of the
partition as it is mandatory for UBI.

The added code is under compilation flag CONFIG_DFU_SF_PART
activated by default.

for example:

U-Boot> env set dfu_alt_info "spl part 0 1;\
u-boot part 0 2;u-boot-env part 0 3;UBI partubi 0 4"
U-Boot> dfu 0 sf 0:0:10000000:0

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

doc/README.dfu

@@ -33,6 +33,7 @@ Configuration Options:
   CONFIG_DFU_NAND
   CONFIG_DFU_RAM
   CONFIG_DFU_SF
+  CONFIG_DFU_SF_PART
   CONFIG_CMD_DFU
 
 Environment variables:
@@ -89,6 +90,10 @@ Commands:
     cmd: dfu 0 sf <dev>
     each element in "dfu_alt_info" =
       <name> ram <offset> <size>  raw access to sf device
+      <name> part <dev> <part_id>  raw acces to partition
+      <name> partubi <dev> <part_id>  raw acces to ubi partition
+
+      with <partid> is the MTD partition index
 
 Host tools:
   When U-Boot runs the dfu stack, the DFU host tools can be used

drivers/dfu/Kconfig

@@ -46,5 +46,13 @@ config DFU_SF
 	  This option enables using DFU to read and write to SPI flash based
 	  storage.
 
+config DFU_SF_PART
+	bool "MTD partition support for SPI flash back end"
+	depends on DFU_SF && CMD_MTDPARTS
+	default y
+	help
+	  This option enables the support of "part" and "partubi" target in
+	  SPI flash DFU back end.
+
 endif
 endmenu

drivers/dfu/dfu_sf.c

@@ -10,6 +10,8 @@
 #include <dfu.h>
 #include <spi.h>
 #include <spi_flash.h>
+#include <jffs2/load_kernel.h>
+#include <linux/mtd/mtd.h>
 
 static int dfu_get_medium_size_sf(struct dfu_entity *dfu, u64 *size)
 {
@@ -52,11 +54,33 @@ static int dfu_write_medium_sf(struct dfu_entity *dfu,
 
 static int dfu_flush_medium_sf(struct dfu_entity *dfu)
 {
+	u64 off, length;
+
+	if (!CONFIG_IS_ENABLED(DFU_SF_PART) || !dfu->data.sf.ubi)
+		return 0;
+
+	/* in case of ubi partition, erase rest of the partition */
+	off = find_sector(dfu, dfu->data.sf.start, dfu->offset);
+	/* last write ended with unaligned length jump to next */
+	if (off != dfu->data.sf.start + dfu->offset)
+		off += dfu->data.sf.dev->sector_size;
+	length = dfu->data.sf.start + dfu->data.sf.size - off;
+	if (length)
+		return spi_flash_erase(dfu->data.sf.dev, off, length);
+
 	return 0;
 }
 
 static unsigned int dfu_polltimeout_sf(struct dfu_entity *dfu)
 {
+	/*
+	 * Currently, Poll Timeout != 0 is only needed on nand
+	 * ubi partition, as sectors which are not used need
+	 * to be erased
+	 */
+	if (CONFIG_IS_ENABLED(DFU_SF_PART) && dfu->data.sf.ubi)
+		return DFU_MANIFEST_POLL_TIMEOUT;
+
 	return DFU_DEFAULT_POLL_TIMEOUT;
 }
 
@@ -133,6 +157,34 @@ int dfu_fill_entity_sf(struct dfu_entity *dfu, char *devstr, char *s)
 		dfu->data.sf.start = simple_strtoul(s, &s, 16);
 		s++;
 		dfu->data.sf.size = simple_strtoul(s, &s, 16);
+	} else if (CONFIG_IS_ENABLED(DFU_SF_PART) &&
+		   (!strcmp(st, "part") || !strcmp(st, "partubi"))) {
+		char mtd_id[32];
+		struct mtd_device *mtd_dev;
+		u8 part_num;
+		struct part_info *pi;
+		int ret, dev, part;
+
+		dfu->layout = DFU_RAW_ADDR;
+
+		dev = simple_strtoul(s, &s, 10);
+		s++;
+		part = simple_strtoul(s, &s, 10);
+
+		sprintf(mtd_id, "%s%d,%d", "nor", dev, part - 1);
+		printf("using id '%s'\n", mtd_id);
+
+		mtdparts_init();
+
+		ret = find_dev_and_part(mtd_id, &mtd_dev, &part_num, &pi);
+		if (ret != 0) {
+			printf("Could not locate '%s'\n", mtd_id);
+			return -1;
+		}
+		dfu->data.sf.start = pi->offset;
+		dfu->data.sf.size = pi->size;
+		if (!strcmp(st, "partubi"))
+			dfu->data.sf.ubi = 1;
 	} else {
 		printf("%s: Memory layout (%s) not supported!\n", __func__, st);
 		spi_flash_free(dfu->data.sf.dev);

include/dfu.h

@@ -77,6 +77,8 @@ struct sf_internal_data {
 	/* RAW programming */
 	u64 start;
 	u64 size;
+	/* for sf/ubi use */
+	unsigned int ubi;
 };
 
 #define DFU_NAME_SIZE			32