mxc_nand: rework get_dev_status

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=c29c607afa2e94a43f249f19a2d3097e56aaedd7
Commit:     c29c607afa2e94a43f249f19a2d3097e56aaedd7
Parent:     938cf997f998f3172e7cb9beafceccdec259b10d
Author:     Sascha Hauer <s.hauer at pengutronix.de>
AuthorDate: Fri Aug 6 15:53:05 2010 +0200
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Fri Aug 6 16:34:54 2010 +0100

    mxc_nand: rework get_dev_status
    
    We save/restore the value in the buffer anyway, so it makes
    no difference whether we use main_area0 or main_area1. So,
    we can use main_area0 and remove main_area1 from the driver
    which is otherwise unused. Also, clean up the comments in
    get_dev_status.
    
    Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 drivers/mtd/nand/mxc_nand.c |   21 +++++++++------------
 1 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index f14f933..b6aa7e3 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -102,7 +102,6 @@ struct mxc_nand_host {
 
 	void			*spare0;
 	void			*main_area0;
-	void			*main_area1;
 
 	void __iomem		*base;
 	void __iomem		*regs;
@@ -305,25 +304,24 @@ static void send_read_id(struct mxc_nand_host *host)
  * NAND device status and returns the current status. */
 static uint16_t get_dev_status(struct mxc_nand_host *host)
 {
-	void __iomem *main_buf = host->main_area1;
+	void __iomem *main_buf = host->main_area0;
 	uint32_t store;
 	uint16_t ret;
-	/* Issue status request to NAND device */
 
-	/* store the main area1 first word, later do recovery */
+	writew(0x0, NFC_V1_V2_BUF_ADDR);
+
+	/*
+	 * The device status is stored in main_area0. To
+	 * prevent corruption of the buffer save the value
+	 * and restore it afterwards.
+	 */
 	store = readl(main_buf);
-	/* NANDFC buffer 1 is used for device status to prevent
-	 * corruption of read/write buffer on status requests. */
-	writew(1, host->regs + NFC_BUF_ADDR);
 
 	writew(NFC_STATUS, host->regs + NFC_CONFIG2);
-
-	/* Wait for operation to complete */
 	wait_op_done(host, true);
 
-	/* Status is placed in first word of main buffer */
-	/* get status, then recovery area 1 data */
 	ret = readw(main_buf);
+
 	writel(store, main_buf);
 
 	return ret;
@@ -761,7 +759,6 @@ static int __init mxcnd_probe(struct platform_device *pdev)
 	}
 
 	host->main_area0 = host->base;
-	host->main_area1 = host->base + 0x200;
 
 	if (nfc_is_v21()) {
 		host->regs = host->base + 0x1e00;