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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2010-08-06 15:53:05 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-08-06 16:34:54 +0100 |
| commit | c29c607afa2e94a43f249f19a2d3097e56aaedd7 (patch) | |
| tree | 62ede8e280f1d5aaa6b1adf403c973d9cc594156 | |
| parent | 938cf997f998f3172e7cb9beafceccdec259b10d (diff) | |
| download | kernel_samsung_smdk4412-c29c607afa2e94a43f249f19a2d3097e56aaedd7.zip kernel_samsung_smdk4412-c29c607afa2e94a43f249f19a2d3097e56aaedd7.tar.gz kernel_samsung_smdk4412-c29c607afa2e94a43f249f19a2d3097e56aaedd7.tar.bz2 | |
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>
| -rw-r--r-- | 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; |