--- 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 { 602c4df89a593ac858d708e9ed'>131-clk-Add-__clk_mux_determine_rate_closest.patch
blob: 18972f353791fb7c381a620a76016422f3442a6a (plain) 
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