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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@pengutronix.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Sascha Hauer 2010-08-06 15:53:05 +02:00 committed by David Woodhouse
parent 938cf997f9
commit c29c607afa
1 changed files with 9 additions and 12 deletions
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21
drivers/mtd/nand/mxc_nand.c
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@ -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;