+
+ /*
+ * Write out the command to the device.
+ */
+ if (command == NAND_CMD_SEQIN) {
+ int readcmd;
+
+ if (column >= mtd->oobblock) {
+ /* OOB area */
+ column -= mtd->oobblock;
+ readcmd = NAND_CMD_READOOB;
+ } else if (column < 256) {
+ /* First 256 bytes --> READ0 */
+ readcmd = NAND_CMD_READ0;
+ } else {
+ column -= 256;
+ readcmd = NAND_CMD_READ1;
+ }
+ WriteDOC(readcmd, docptr, Mplus_FlashCmd);
+ }
+ WriteDOC(command, docptr, Mplus_FlashCmd);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+
+ if (column != -1 || page_addr != -1) {
+ /* Serially input address */
+ if (column != -1) {
+ /* Adjust columns for 16 bit buswidth */
+ if (this->options & NAND_BUSWIDTH_16)
+ column >>= 1;
+ WriteDOC(column, docptr, Mplus_FlashAddress);
+ }
+ if (page_addr != -1) {
+ WriteDOC((unsigned char) (page_addr & 0xff), docptr, Mplus_FlashAddress);
+ WriteDOC((unsigned char) ((page_addr >> 8) & 0xff), docptr, Mplus_FlashAddress);
+ /* One more address cycle for higher density devices */
+ if (this->chipsize & 0x0c000000) {
+ WriteDOC((unsigned char) ((page_addr >> 16) & 0x0f), docptr, Mplus_FlashAddress);
+ printk("high density\n");
+ }
+ }
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ /* deassert ALE */
+ if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 || command == NAND_CMD_READOOB || command == NAND_CMD_READID)
+ WriteDOC(0, docptr, Mplus_FlashControl);
+ }
+
+ /*
+ * program and erase have their own busy handlers
+ * status and sequential in needs no delay
+ */
+ switch (command) {
+
+ case NAND_CMD_PAGEPROG:
+ case NAND_CMD_ERASE1:
+ case NAND_CMD_ERASE2:
+ case NAND_CMD_SEQIN:
+ case NAND_CMD_STATUS:
+ return;
+
+ case NAND_CMD_RESET:
+ if (this->dev_ready)
+ break;
+ udelay(this->chip_delay);
+ WriteDOC(NAND_CMD_STATUS, docptr, Mplus_FlashCmd);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ while ( !(this->read_byte(mtd) & 0x40));
+ return;
+
+ /* This applies to read commands */
+ default:
+ /*
+ * If we don't have access to the busy pin, we apply the given
+ * command delay
+ */
+ if (!this->dev_ready) {
+ udelay (this->chip_delay);
+ return;
+ }
+ }
+
+ /* Apply this short delay always to ensure that we do wait tWB in
+ * any case on any machine. */
+ ndelay (100);
+ /* wait until command is processed */
+ while (!this->dev_ready(mtd));
+}
+
+static int doc200x_dev_ready(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ if (DoC_is_MillenniumPlus(doc)) {
+ /* 11.4.2 -- must NOP four times before checking FR/B# */
+ DoC_Delay(doc, 4);
+ if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
+ if(debug)
+ printk("not ready\n");
+ return 0;
+ }
+ if (debug)printk("was ready\n");
+ return 1;
+ } else {
+ /* 11.4.2 -- must NOP four times before checking FR/B# */
+ DoC_Delay(doc, 4);
+ if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
+ if(debug)
+ printk("not ready\n");
+ return 0;
+ }
+ /* 11.4.2 -- Must NOP twice if it's ready */
+ DoC_Delay(doc, 2);
+ if (debug)printk("was ready\n");
+ return 1;
+ }
+}