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176 lines
4.8 KiB
Diff
176 lines
4.8 KiB
Diff
From 173b0add0cff6558f950c0cb1eacfb729d482711 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Sun, 17 May 2015 18:48:38 +0200
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Subject: [PATCH 4/8] mtd: part: add generic parsing of linux,part-probe
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This moves the linux,part-probe device tree parsing code from
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physmap_of.c to mtdpart.c. Now all drivers can use this feature by just
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providing a reference to their device tree node in struct
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mtd_part_parser_data.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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Documentation/devicetree/bindings/mtd/nand.txt | 16 ++++++++++
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drivers/mtd/maps/physmap_of.c | 40 +-----------------------
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drivers/mtd/mtdpart.c | 43 ++++++++++++++++++++++++++
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3 files changed, 60 insertions(+), 39 deletions(-)
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--- a/Documentation/devicetree/bindings/mtd/nand.txt
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+++ b/Documentation/devicetree/bindings/mtd/nand.txt
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@@ -12,6 +12,22 @@
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- nand-ecc-step-size: integer representing the number of data bytes
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that are covered by a single ECC step.
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+- linux,part-probe: list of name as strings of the partition parser
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+ which should be used to parse the partition table.
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+ They will be tried in the specified ordering and
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+ the next one will be used if the previous one
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+ failed.
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+
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+ Example: linux,part-probe = "cmdlinepart", "ofpart";
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+
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+ This is also the default value, which will be used
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+ if this attribute is not specified. It could be
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+ that the flash driver in use overwrote the default
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+ value and uses some other default.
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+
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+ Possible values are: bcm47xxpart, afs, ar7part,
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+ ofoldpart, ofpart, bcm63xxpart, RedBoot, cmdlinepart
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+
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The ECC strength and ECC step size properties define the correction capability
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of a controller. Together, they say a controller can correct "{strength} bit
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errors per {size} bytes".
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--- a/drivers/mtd/maps/physmap_of.c
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+++ b/drivers/mtd/maps/physmap_of.c
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@@ -114,45 +114,9 @@ static struct mtd_info *obsolete_probe(s
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static const char * const part_probe_types_def[] = {
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"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
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-static const char * const *of_get_probes(struct device_node *dp)
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-{
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- const char *cp;
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- int cplen;
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- unsigned int l;
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- unsigned int count;
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- const char **res;
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-
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- cp = of_get_property(dp, "linux,part-probe", &cplen);
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- if (cp == NULL)
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- return part_probe_types_def;
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-
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- count = 0;
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- for (l = 0; l != cplen; l++)
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- if (cp[l] == 0)
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- count++;
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-
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- res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
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- count = 0;
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- while (cplen > 0) {
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- res[count] = cp;
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- l = strlen(cp) + 1;
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- cp += l;
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- cplen -= l;
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- count++;
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- }
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- return res;
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-}
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-
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-static void of_free_probes(const char * const *probes)
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-{
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- if (probes != part_probe_types_def)
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- kfree(probes);
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-}
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-
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static struct of_device_id of_flash_match[];
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static int of_flash_probe(struct platform_device *dev)
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{
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- const char * const *part_probe_types;
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const struct of_device_id *match;
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struct device_node *dp = dev->dev.of_node;
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struct resource res;
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@@ -302,10 +266,8 @@ static int of_flash_probe(struct platfor
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goto err_out;
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ppdata.of_node = dp;
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- part_probe_types = of_get_probes(dp);
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- mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
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+ mtd_device_parse_register(info->cmtd, part_probe_types_def, &ppdata,
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NULL, 0);
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- of_free_probes(part_probe_types);
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kfree(mtd_list);
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -29,6 +29,7 @@
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#include <linux/kmod.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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+#include <linux/of.h>
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#include <linux/err.h>
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#include "mtdcore.h"
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@@ -702,6 +703,40 @@ void deregister_mtd_parser(struct mtd_pa
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EXPORT_SYMBOL_GPL(deregister_mtd_parser);
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/*
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+ * Parses the linux,part-probe device tree property.
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+ * When a non null value is returned it has to be freed with kfree() by
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+ * the caller.
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+ */
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+static const char * const *of_get_probes(struct device_node *dp)
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+{
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+ const char *cp;
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+ int cplen;
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+ unsigned int l;
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+ unsigned int count;
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+ const char **res;
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+
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+ cp = of_get_property(dp, "linux,part-probe", &cplen);
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+ if (cp == NULL)
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+ return NULL;
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+
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+ count = 0;
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+ for (l = 0; l != cplen; l++)
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+ if (cp[l] == 0)
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+ count++;
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+
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+ res = kzalloc((count + 1) * sizeof(*res), GFP_KERNEL);
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+ count = 0;
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+ while (cplen > 0) {
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+ res[count] = cp;
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+ l = strlen(cp) + 1;
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+ cp += l;
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+ cplen -= l;
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+ count++;
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+ }
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+ return res;
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+}
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+
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+/*
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* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
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* are changing this array!
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*/
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@@ -737,6 +772,13 @@ int parse_mtd_partitions(struct mtd_info
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{
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struct mtd_part_parser *parser;
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int ret = 0;
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+ const char *const *types_of = NULL;
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+
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+ if (data && data->of_node) {
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+ types_of = of_get_probes(data->of_node);
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+ if (types_of != NULL)
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+ types = types_of;
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+ }
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if (!types)
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types = default_mtd_part_types;
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@@ -755,6 +797,7 @@ int parse_mtd_partitions(struct mtd_info
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break;
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}
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}
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+ kfree(types_of);
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return ret;
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}
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