mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
6856535e29
The "linux,part-probe" dts parsing is a pretty neat generic feature. It has been posted to kernel.org and could easily be reused by all targets. This change moves the patch to the 3.18 and 4.1 generic folders, and makes the feature available to all platforms who may want to use it. Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org> Acked-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 46654
143 lines
4.1 KiB
Diff
143 lines
4.1 KiB
Diff
--- a/drivers/mtd/mtdpart.c
|
|
+++ b/drivers/mtd/mtdpart.c
|
|
@@ -36,6 +36,8 @@
|
|
#include "mtdcore.h"
|
|
#include "mtdsplit/mtdsplit.h"
|
|
|
|
+#define MTD_ERASE_PARTIAL 0x8000 /* partition only covers parts of an erase block */
|
|
+
|
|
/* Our partition linked list */
|
|
static LIST_HEAD(mtd_partitions);
|
|
static DEFINE_MUTEX(mtd_partitions_mutex);
|
|
@@ -234,13 +236,61 @@ static int part_erase(struct mtd_info *m
|
|
struct mtd_part *part = PART(mtd);
|
|
int ret;
|
|
|
|
+
|
|
+ instr->partial_start = false;
|
|
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
|
|
+ size_t readlen = 0;
|
|
+ u64 mtd_ofs;
|
|
+
|
|
+ instr->erase_buf = kmalloc(part->master->erasesize, GFP_ATOMIC);
|
|
+ if (!instr->erase_buf)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ mtd_ofs = part->offset + instr->addr;
|
|
+ instr->erase_buf_ofs = do_div(mtd_ofs, part->master->erasesize);
|
|
+
|
|
+ if (instr->erase_buf_ofs > 0) {
|
|
+ instr->addr -= instr->erase_buf_ofs;
|
|
+ ret = mtd_read(part->master,
|
|
+ instr->addr + part->offset,
|
|
+ part->master->erasesize,
|
|
+ &readlen, instr->erase_buf);
|
|
+
|
|
+ instr->len += instr->erase_buf_ofs;
|
|
+ instr->partial_start = true;
|
|
+ } else {
|
|
+ mtd_ofs = part->offset + part->mtd.size;
|
|
+ instr->erase_buf_ofs = part->master->erasesize -
|
|
+ do_div(mtd_ofs, part->master->erasesize);
|
|
+
|
|
+ if (instr->erase_buf_ofs > 0) {
|
|
+ instr->len += instr->erase_buf_ofs;
|
|
+ ret = mtd_read(part->master,
|
|
+ part->offset + instr->addr +
|
|
+ instr->len - part->master->erasesize,
|
|
+ part->master->erasesize, &readlen,
|
|
+ instr->erase_buf);
|
|
+ } else {
|
|
+ ret = 0;
|
|
+ }
|
|
+ }
|
|
+ if (ret < 0) {
|
|
+ kfree(instr->erase_buf);
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ }
|
|
+
|
|
instr->addr += part->offset;
|
|
ret = part->master->_erase(part->master, instr);
|
|
if (ret) {
|
|
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
|
|
instr->fail_addr -= part->offset;
|
|
instr->addr -= part->offset;
|
|
+ if (mtd->flags & MTD_ERASE_PARTIAL)
|
|
+ kfree(instr->erase_buf);
|
|
}
|
|
+
|
|
return ret;
|
|
}
|
|
|
|
@@ -248,7 +298,25 @@ void mtd_erase_callback(struct erase_inf
|
|
{
|
|
if (instr->mtd->_erase == part_erase) {
|
|
struct mtd_part *part = PART(instr->mtd);
|
|
+ size_t wrlen = 0;
|
|
|
|
+ if (instr->mtd->flags & MTD_ERASE_PARTIAL) {
|
|
+ if (instr->partial_start) {
|
|
+ part->master->_write(part->master,
|
|
+ instr->addr, instr->erase_buf_ofs,
|
|
+ &wrlen, instr->erase_buf);
|
|
+ instr->addr += instr->erase_buf_ofs;
|
|
+ } else {
|
|
+ instr->len -= instr->erase_buf_ofs;
|
|
+ part->master->_write(part->master,
|
|
+ instr->addr + instr->len,
|
|
+ instr->erase_buf_ofs, &wrlen,
|
|
+ instr->erase_buf +
|
|
+ part->master->erasesize -
|
|
+ instr->erase_buf_ofs);
|
|
+ }
|
|
+ kfree(instr->erase_buf);
|
|
+ }
|
|
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
|
|
instr->fail_addr -= part->offset;
|
|
instr->addr -= part->offset;
|
|
@@ -515,17 +583,20 @@ static struct mtd_part *allocate_partiti
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
|
|
/* Doesn't start on a boundary of major erase size */
|
|
- /* FIXME: Let it be writable if it is on a boundary of
|
|
- * _minor_ erase size though */
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
|
- part->name);
|
|
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
|
|
+ if (((u32) slave->mtd.size) > master->erasesize)
|
|
+ slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
+ else
|
|
+ slave->mtd.erasesize = slave->mtd.size;
|
|
}
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
- mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
|
- part->name);
|
|
+ mtd_mod_by_eb(slave->offset + slave->mtd.size, &slave->mtd)) {
|
|
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
|
|
+
|
|
+ if ((u32) slave->mtd.size > master->erasesize)
|
|
+ slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
+ else
|
|
+ slave->mtd.erasesize = slave->mtd.size;
|
|
}
|
|
|
|
slave->mtd.ecclayout = master->ecclayout;
|
|
--- a/include/linux/mtd/mtd.h
|
|
+++ b/include/linux/mtd/mtd.h
|
|
@@ -55,6 +55,10 @@ struct erase_info {
|
|
u_long priv;
|
|
u_char state;
|
|
struct erase_info *next;
|
|
+
|
|
+ u8 *erase_buf;
|
|
+ u32 erase_buf_ofs;
|
|
+ bool partial_start;
|
|
};
|
|
|
|
struct mtd_erase_region_info {
|