[MTD] nandsim: add partition capability to nandsim

Enhance nandsim to be able to create more than 1 partition.
A new module parameter 'parts' may be used to specify partition
sizes.

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

1 files changed, 73 insertions, 24 deletions

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index c3bca9590ad2..638e6c256d3e 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -37,6 +37,7 @@
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
 #include <linux/delay.h>
+#include <linux/list.h>
 
 /* Default simulator parameters values */
 #if !defined(CONFIG_NANDSIM_FIRST_ID_BYTE)  || \
@@ -90,6 +91,8 @@ static uint bus_width      = CONFIG_NANDSIM_BUS_WIDTH;
 static uint do_delays      = CONFIG_NANDSIM_DO_DELAYS;
 static uint log            = CONFIG_NANDSIM_LOG;
 static uint dbg            = CONFIG_NANDSIM_DBG;
+static unsigned long parts[MAX_MTD_DEVICES];
+static unsigned int parts_num;
 
 module_param(first_id_byte,  uint, 0400);
 module_param(second_id_byte, uint, 0400);
@@ -104,6 +107,7 @@ module_param(bus_width,      uint, 0400);
 module_param(do_delays,      uint, 0400);
 module_param(log,            uint, 0400);
 module_param(dbg,            uint, 0400);
+module_param_array(parts, ulong, &parts_num, 0400);
 
 MODULE_PARM_DESC(first_id_byte,  "The fist byte returned by NAND Flash 'read ID' command (manufaturer ID)");
 MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID)");
@@ -118,6 +122,7 @@ MODULE_PARM_DESC(bus_width,      "Chip's bus width (8- or 16-bit)");
 MODULE_PARM_DESC(do_delays,      "Simulate NAND delays using busy-waits if not zero");
 MODULE_PARM_DESC(log,            "Perform logging if not zero");
 MODULE_PARM_DESC(dbg,            "Output debug information if not zero");
+MODULE_PARM_DESC(parts,          "Partition sizes (in erase blocks) separated by commas");
 
 /* The largest possible page size */
 #define NS_LARGEST_PAGE_SIZE    2048
@@ -131,9 +136,9 @@ MODULE_PARM_DESC(dbg,            "Output debug information if not zero");
 #define NS_DBG(args...) \
         do { if (dbg) printk(KERN_DEBUG NS_OUTPUT_PREFIX " debug: " args); } while(0)
 #define NS_WARN(args...) \
-        do { printk(KERN_WARNING NS_OUTPUT_PREFIX " warnig: " args); } while(0)
+        do { printk(KERN_WARNING NS_OUTPUT_PREFIX " warning: " args); } while(0)
 #define NS_ERR(args...) \
-        do { printk(KERN_ERR NS_OUTPUT_PREFIX " errorr: " args); } while(0)
+        do { printk(KERN_ERR NS_OUTPUT_PREFIX " error: " args); } while(0)
 
 /* Busy-wait delay macros (microseconds, milliseconds) */
 #define NS_UDELAY(us) \
@@ -238,7 +243,8 @@ union ns_mem {
  * The structure which describes all the internal simulator data.
  */
 struct nandsim {
-        struct mtd_partition part;
+        struct mtd_partition partitions[MAX_MTD_DEVICES];
+        unsigned int nbparts;
 
         uint busw;              /* flash chip bus width (8 or 16) */
         u_char ids[4];          /* chip's ID bytes */
@@ -381,6 +387,13 @@ static void free_device(struct nandsim *ns)
         }
 }
 
+static char *get_partition_name(int i)
+{
+        char buf[64];
+        sprintf(buf, "NAND simulator partition %d", i);
+        return kstrdup(buf, GFP_KERNEL);
+}
+
 /*
  * Initialize the nandsim structure.
  *
@@ -390,7 +403,9 @@ 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;
+        int i, ret = 0;
+        u_int32_t remains;
+        u_int32_t next_offset;
 
         if (NS_IS_INITIALIZED(ns)) {
                 NS_ERR("init_nandsim: nandsim is already initialized\n");
@@ -448,6 +463,40 @@ static int init_nandsim(struct mtd_info *mtd)
                 }
         }
 
+        /* Fill the partition_info structure */
+        if (parts_num > ARRAY_SIZE(ns->partitions)) {
+                NS_ERR("too many partitions.\n");
+                ret = -EINVAL;
+                goto error;
+        }
+        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) {
+                        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;
+                next_offset += ns->partitions[i].size;
+                remains -= ns->partitions[i].size;
+        }
+        ns->nbparts = parts_num;
+        if (remains) {
+                if (parts_num + 1 > ARRAY_SIZE(ns->partitions)) {
+                        NS_ERR("too many partitions.\n");
+                        ret = -EINVAL;
+                        goto error;
+                }
+                ns->partitions[i].name   = get_partition_name(i);
+                ns->partitions[i].offset = next_offset;
+                ns->partitions[i].size   = remains;
+                ns->nbparts += 1;
+        }
+
         /* Detect how many ID bytes the NAND chip outputs */
         for (i = 0; nand_flash_ids[i].name != NULL; i++) {
                 if (second_id_byte != nand_flash_ids[i].id)
@@ -474,7 +523,7 @@ static int init_nandsim(struct mtd_info *mtd)
         printk("sector address bytes: %u\n",    ns->geom.secaddrbytes);
         printk("options: %#x\n",                ns->options);
 
-        if (alloc_device(ns) != 0)
+        if ((ret = alloc_device(ns)) != 0)
                 goto error;
 
         /* Allocate / initialize the internal buffer */
@@ -482,21 +531,17 @@ static int init_nandsim(struct mtd_info *mtd)
         if (!ns->buf.byte) {
                 NS_ERR("init_nandsim: unable to allocate %u bytes for the internal buffer\n",
                         ns->geom.pgszoob);
+                ret = -ENOMEM;
                 goto error;
         }
         memset(ns->buf.byte, 0xFF, ns->geom.pgszoob);
 
-        /* Fill the partition_info structure */
-        ns->part.name   = "NAND simulator partition";
-        ns->part.offset = 0;
-        ns->part.size   = ns->geom.totsz;
-
         return 0;
 
 error:
         free_device(ns);
 
-        return -ENOMEM;
+        return ret;
 }
 
 /*
@@ -1503,7 +1548,7 @@ static int __init ns_init_module(void)
 {
         struct nand_chip *chip;
         struct nandsim *nand;
-        int retval = -ENOMEM;
+        int retval = -ENOMEM, i;
 
         if (bus_width != 8 && bus_width != 16) {
                 NS_ERR("wrong bus width (%d), use only 8 or 16\n", bus_width);
@@ -1564,21 +1609,23 @@ static int __init ns_init_module(void)
                 goto error;
         }
 
-        if ((retval = init_nandsim(nsmtd)) != 0) {
-                NS_ERR("scan_bbt: can't initialize the nandsim structure\n");
-                goto error;
-        }
+        if ((retval = init_nandsim(nsmtd)) != 0)
+                goto err_exit;
 
-        if ((retval = nand_default_bbt(nsmtd)) != 0) {
-                free_nandsim(nand);
-                goto error;
-        }
+        if ((retval = nand_default_bbt(nsmtd)) != 0)
+                goto err_exit;
 
-        /* Register NAND as one big partition */
-        add_mtd_partitions(nsmtd, &nand->part, 1);
+        /* Register NAND partitions */
+        if ((retval = add_mtd_partitions(nsmtd, &nand->partitions[0], nand->nbparts)) != 0)
+                goto err_exit;
 
         return 0;
 
+err_exit:
+        free_nandsim(nand);
+        nand_release(nsmtd);
+        for (i = 0;i < ARRAY_SIZE(nand->partitions); ++i)
+                kfree(nand->partitions[i].name);
 error:
         kfree(nsmtd);
 
@@ -1593,9 +1640,12 @@ module_init(ns_init_module);
 static void __exit ns_cleanup_module(void)
 {
         struct nandsim *ns = (struct nandsim *)(((struct nand_chip *)nsmtd->priv)->priv);
+        int i;
 
         free_nandsim(ns);    /* Free nandsim private resources */
-        nand_release(nsmtd); /* Unregisterd drived */
+        nand_release(nsmtd); /* Unregister driver */
+        for (i = 0;i < ARRAY_SIZE(ns->partitions); ++i)
+                kfree(ns->partitions[i].name);
         kfree(nsmtd);        /* Free other structures */
 }
 
@@ -1604,4 +1654,3 @@ module_exit(ns_cleanup_module);
 MODULE_LICENSE ("GPL");
 MODULE_AUTHOR ("Artem B. Bityuckiy");
 MODULE_DESCRIPTION ("The NAND flash simulator");
-