[MTD ONENAND] Check OneNAND lock scheme & all block unlock command support

OneNAND lock scheme depends on density and process of chip.
Some OneNAND chips support all block unlock

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 118 insertions, 19 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 09aefe2164aa..8ed68b28afe3 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1,7 +1,7 @@
 /*
  *  linux/drivers/mtd/onenand/onenand_base.c
  *
- *  Copyright (C) 2005 Samsung Electronics
+ *  Copyright (C) 2005-2006 Samsung Electronics
  *  Kyungmin Park <kyungmin.park@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -199,6 +199,7 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
         case ONENAND_CMD_UNLOCK:
         case ONENAND_CMD_LOCK:
         case ONENAND_CMD_LOCK_TIGHT:
+        case ONENAND_CMD_UNLOCK_ALL:
                 block = -1;
                 page = -1;
                 break;
@@ -1211,11 +1212,11 @@ static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
         end = len >> this->erase_shift;
 
         /* Continuous lock scheme */
-        if (this->options & ONENAND_CONT_LOCK) {
+        if (this->options & ONENAND_HAS_CONT_LOCK) {
                 /* Set start block address */
                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
                 /* Set end block address */
-                this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
+                this->write_word(start + end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
                 /* Write unlock command */
                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
 
@@ -1236,7 +1237,7 @@ static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
         }
 
         /* Block lock scheme */
-        for (block = start; block < end; block++) {
+        for (block = start; block < start + end; block++) {
                 /* Set block address */
                 value = onenand_block_address(this, block);
                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
@@ -1265,6 +1266,79 @@ static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
         return 0;
 }
 
+/**
+ * onenand_check_lock_status - [OneNAND Interface] Check lock status
+ * @param this          onenand chip data structure
+ *
+ * Check lock status
+ */
+static void onenand_check_lock_status(struct onenand_chip *this)
+{
+        unsigned int value, block, status;
+        unsigned int end;
+
+        end = this->chipsize >> this->erase_shift;
+        for (block = 0; block < end; block++) {
+                /* Set block address */
+                value = onenand_block_address(this, block);
+                this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
+                /* Select DataRAM for DDP */
+                value = onenand_bufferram_address(this, block);
+                this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+                /* Set start block address */
+                this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
+
+                /* Check lock status */
+                status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
+                if (!(status & ONENAND_WP_US))
+                        printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
+        }
+}
+
+/**
+ * onenand_unlock_all - [OneNAND Interface] unlock all blocks
+ * @param mtd           MTD device structure
+ *
+ * Unlock all blocks
+ */
+static int onenand_unlock_all(struct mtd_info *mtd)
+{
+        struct onenand_chip *this = mtd->priv;
+
+        if (this->options & ONENAND_HAS_UNLOCK_ALL) {
+                /* Write unlock command */
+                this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
+
+                /* There's no return value */
+                this->wait(mtd, FL_UNLOCKING);
+
+                /* Sanity check */
+                while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
+                    & ONENAND_CTRL_ONGO)
+                        continue;
+
+                /* Workaround for all block unlock in DDP */
+                if (this->device_id & ONENAND_DEVICE_IS_DDP) {
+                        loff_t ofs;
+                        size_t len;
+
+                        /* 1st block on another chip */
+                        ofs = this->chipsize >> 1;
+                        len = 1 << this->erase_shift;
+
+                        onenand_unlock(mtd, ofs, len);
+                }
+
+                onenand_check_lock_status(this);
+
+                return 0;
+        }
+
+        mtd->unlock(mtd, 0x0, this->chipsize);
+
+        return 0;
+}
+
 #ifdef CONFIG_MTD_ONENAND_OTP
 
 /* Interal OTP operation */
@@ -1564,12 +1638,43 @@ static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
 #endif  /* CONFIG_MTD_ONENAND_OTP */
 
 /**
+ * onenand_lock_scheme - Check and set OneNAND lock scheme
+ * @param mtd           MTD data structure
+ *
+ * Check and set OneNAND lock scheme
+ */
+static void onenand_lock_scheme(struct mtd_info *mtd)
+{
+        struct onenand_chip *this = mtd->priv;
+        unsigned int density, process;
+
+        /* Lock scheme depends on density and process */
+        density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
+        process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
+
+        /* Lock scheme */
+        if (density >= ONENAND_DEVICE_DENSITY_1Gb) {
+                /* A-Die has all block unlock */
+                if (process) {
+                        printk(KERN_DEBUG "Chip support all block unlock\n");
+                        this->options |= ONENAND_HAS_UNLOCK_ALL;
+                }
+        } else {
+                /* Some OneNAND has continues lock scheme */
+                if (!process) {
+                        printk(KERN_DEBUG "Lock scheme is Continues Lock\n");
+                        this->options |= ONENAND_HAS_CONT_LOCK;
+                }
+        }
+}
+
+/**
  * onenand_print_device_info - Print device ID
  * @param device        device ID
  *
  * Print device ID
  */
-static void onenand_print_device_info(int device)
+static void onenand_print_device_info(int device, int version)
 {
         int vcc, demuxed, ddp, density;
 
@@ -1583,6 +1688,7 @@ static void onenand_print_device_info(int device)
                 (16 << density),
                 vcc ? "2.65/3.3" : "1.8",
                 device);
+        printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version);
 }
 
 static const struct onenand_manufacturers onenand_manuf_ids[] = {
@@ -1625,8 +1731,7 @@ static int onenand_check_maf(int manuf)
 static int onenand_probe(struct mtd_info *mtd)
 {
         struct onenand_chip *this = mtd->priv;
-        int bram_maf_id, bram_dev_id, maf_id, dev_id;
-        int version_id;
+        int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
         int density;
         int syscfg;
 
@@ -1657,14 +1762,16 @@ static int onenand_probe(struct mtd_info *mtd)
         /* Read manufacturer and device IDs from Register */
         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
+        ver_id= this->read_word(this->base + ONENAND_REG_VERSION_ID);
 
         /* Check OneNAND device */
         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
                 return -ENXIO;
 
         /* Flash device information */
-        onenand_print_device_info(dev_id);
+        onenand_print_device_info(dev_id, ver_id);
         this->device_id = dev_id;
+        this->version_id = ver_id;
 
         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
         this->chipsize = (16 << density) << 20;
@@ -1687,16 +1794,8 @@ static int onenand_probe(struct mtd_info *mtd)
 
         mtd->size = this->chipsize;
 
-        /* Version ID */
-        version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
-        printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
-
-        /* Lock scheme */
-        if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
-            !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
-                printk(KERN_INFO "Lock scheme is Continues Lock\n");
-                this->options |= ONENAND_CONT_LOCK;
-        }
+        /* Check OneNAND lock scheme */
+        onenand_lock_scheme(mtd);
 
         return 0;
 }
@@ -1832,7 +1931,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
         mtd->owner = THIS_MODULE;
 
         /* Unlock whole block */
-        mtd->unlock(mtd, 0x0, this->chipsize);
+        onenand_unlock_all(mtd);
 
         return this->scan_bbt(mtd);
 }