[MTD] [NAND] nandsim: allow for 64-bit size

Amend nandsim so that it does not assume 32-bit flash size.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 21 insertions, 14 deletions

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index b48051684733..68c150c8ff9d 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -298,11 +298,11 @@ struct nandsim {
 
         /* NAND flash "geometry" */
         struct nandsin_geometry {
-                uint32_t totsz;     /* total flash size, bytes */
+                uint64_t totsz;     /* total flash size, bytes */
                 uint32_t secsz;     /* flash sector (erase block) size, bytes */
                 uint pgsz;          /* NAND flash page size, bytes */
                 uint oobsz;         /* page OOB area size, bytes */
-                uint32_t totszoob;  /* total flash size including OOB, bytes */
+                uint64_t totszoob;  /* total flash size including OOB, bytes */
                 uint pgszoob;       /* page size including OOB , bytes*/
                 uint secszoob;      /* sector size including OOB, bytes */
                 uint pgnum;         /* total number of pages */
@@ -459,6 +459,12 @@ static char *get_partition_name(int i)
         return kstrdup(buf, GFP_KERNEL);
 }
 
+static u_int64_t divide(u_int64_t n, u_int32_t d)
+{
+        do_div(n, d);
+        return n;
+}
+
 /*
  * Initialize the nandsim structure.
  *
@@ -469,8 +475,8 @@ static int init_nandsim(struct mtd_info *mtd)
         struct nand_chip *chip = (struct nand_chip *)mtd->priv;
         struct nandsim   *ns   = (struct nandsim *)(chip->priv);
         int i, ret = 0;
-        u_int32_t remains;
-        u_int32_t next_offset;
+        u_int64_t remains;
+        u_int64_t next_offset;
 
         if (NS_IS_INITIALIZED(ns)) {
                 NS_ERR("init_nandsim: nandsim is already initialized\n");
@@ -487,8 +493,8 @@ static int init_nandsim(struct mtd_info *mtd)
         ns->geom.oobsz    = mtd->oobsize;
         ns->geom.secsz    = mtd->erasesize;
         ns->geom.pgszoob  = ns->geom.pgsz + ns->geom.oobsz;
-        ns->geom.pgnum    = ns->geom.totsz / ns->geom.pgsz;
-        ns->geom.totszoob = ns->geom.totsz + ns->geom.pgnum * ns->geom.oobsz;
+        ns->geom.pgnum    = divide(ns->geom.totsz, ns->geom.pgsz);
+        ns->geom.totszoob = ns->geom.totsz + (uint64_t)ns->geom.pgnum * ns->geom.oobsz;
         ns->geom.secshift = ffs(ns->geom.secsz) - 1;
         ns->geom.pgshift  = chip->page_shift;
         ns->geom.oobshift = ffs(ns->geom.oobsz) - 1;
@@ -537,15 +543,16 @@ static int init_nandsim(struct mtd_info *mtd)
         remains = ns->geom.totsz;
         next_offset = 0;
         for (i = 0; i < parts_num; ++i) {
-                unsigned long part = parts[i];
-                if (!part || part > remains / ns->geom.secsz) {
+                u_int64_t part_sz = (u_int64_t)parts[i] * ns->geom.secsz;
+
+                if (!part_sz || part_sz > remains) {
                         NS_ERR("bad partition size.\n");
                         ret = -EINVAL;
                         goto error;
                 }
                 ns->partitions[i].name   = get_partition_name(i);
                 ns->partitions[i].offset = next_offset;
-                ns->partitions[i].size   = part * ns->geom.secsz;
+                ns->partitions[i].size   = part_sz;
                 next_offset += ns->partitions[i].size;
                 remains -= ns->partitions[i].size;
         }
@@ -573,7 +580,7 @@ static int init_nandsim(struct mtd_info *mtd)
         if (ns->busw == 16)
                 NS_WARN("16-bit flashes support wasn't tested\n");
 
-        printk("flash size: %u MiB\n",          ns->geom.totsz >> 20);
+        printk("flash size: %llu MiB\n",        ns->geom.totsz >> 20);
         printk("page size: %u bytes\n",         ns->geom.pgsz);
         printk("OOB area size: %u bytes\n",     ns->geom.oobsz);
         printk("sector size: %u KiB\n",         ns->geom.secsz >> 10);
@@ -583,7 +590,7 @@ static int init_nandsim(struct mtd_info *mtd)
         printk("bits in sector size: %u\n",     ns->geom.secshift);
         printk("bits in page size: %u\n",       ns->geom.pgshift);
         printk("bits in OOB size: %u\n",        ns->geom.oobshift);
-        printk("flash size with OOB: %u KiB\n", ns->geom.totszoob >> 10);
+        printk("flash size with OOB: %llu KiB\n", ns->geom.totszoob >> 10);
         printk("page address bytes: %u\n",      ns->geom.pgaddrbytes);
         printk("sector address bytes: %u\n",    ns->geom.secaddrbytes);
         printk("options: %#x\n",                ns->options);
@@ -825,7 +832,7 @@ static int setup_wear_reporting(struct mtd_info *mtd)
 
         if (!rptwear)
                 return 0;
-        wear_eb_count = mtd->size / mtd->erasesize;
+        wear_eb_count = divide(mtd->size, mtd->erasesize);
         mem = wear_eb_count * sizeof(unsigned long);
         if (mem / sizeof(unsigned long) != wear_eb_count) {
                 NS_ERR("Too many erase blocks for wear reporting\n");
@@ -2013,7 +2020,7 @@ static int __init ns_init_module(void)
         }
 
         if (overridesize) {
-                u_int32_t new_size = nsmtd->erasesize << overridesize;
+                u_int64_t new_size = (u_int64_t)nsmtd->erasesize << overridesize;
                 if (new_size >> overridesize != nsmtd->erasesize) {
                         NS_ERR("overridesize is too big\n");
                         goto err_exit;
@@ -2021,7 +2028,7 @@ static int __init ns_init_module(void)
                 /* N.B. This relies on nand_scan not doing anything with the size before we change it */
                 nsmtd->size = new_size;
                 chip->chipsize = new_size;
-                chip->chip_shift = ffs(new_size) - 1;
+                chip->chip_shift = ffs(nsmtd->erasesize) + overridesize - 1;
                 chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
         }