mtd: MXC NAND driver fixes (v5)

The following patch fixes:
 - re-initialization of host->col_addr which is used as byte index
   between the successive READID flash commands.
 - compile error when CONFIG_PM is enabled
 - pass on the error code from clk_get()
 - return -ENOMEM in case of failed ioremap()
 - pass on the return value of platform_driver_probe() directly
 - remove excessive printk
 - let command line partition table parsing with mxc_nand name.
   The cmd_line parsing is done via <mtd-id> name that differs
   from mxc_nand by default and looks like "NAND 256MiB 1,8V 8-bit"

Signed-off-by: Vladimir Barinov <vbarinov@embeddedalley.com>
Signed-off-by: Lothar Wassmann <LW@KARO-electronics.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index f3548d0..40c2608 100644 (file)
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -831,6 +831,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
                break;
 
        case NAND_CMD_READID:
+               host->col_addr = 0;
                send_read_id(host);
                break;
 
@@ -867,6 +868,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
        mtd->priv = this;
        mtd->owner = THIS_MODULE;
        mtd->dev.parent = &pdev->dev;
+       mtd->name = "mxc_nand";
 
        /* 50 us command delay time */
        this->chip_delay = 5;
@@ -882,8 +884,10 @@ static int __init mxcnd_probe(struct platform_device *pdev)
        this->verify_buf = mxc_nand_verify_buf;
 
        host->clk = clk_get(&pdev->dev, "nfc");
-       if (IS_ERR(host->clk))
+       if (IS_ERR(host->clk)) {
+               err = PTR_ERR(host->clk);
                goto eclk;
+       }
 
        clk_enable(host->clk);
        host->clk_act = 1;
@@ -896,7 +900,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
 
        host->regs = ioremap(res->start, res->end - res->start + 1);
        if (!host->regs) {
-               err = -EIO;
+               err = -ENOMEM;
                goto eres;
        }
 
@@ -1011,30 +1015,35 @@ static int __devexit mxcnd_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int mxcnd_suspend(struct platform_device *pdev, pm_message_t state)
 {
-       struct mtd_info *info = platform_get_drvdata(pdev);
+       struct mtd_info *mtd = platform_get_drvdata(pdev);
+       struct nand_chip *nand_chip = mtd->priv;
+       struct mxc_nand_host *host = nand_chip->priv;
        int ret = 0;
 
        DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND suspend\n");
-       if (info)
-               ret = info->suspend(info);
-
-       /* Disable the NFC clock */
-       clk_disable(nfc_clk);   /* FIXME */
+       if (mtd) {
+               ret = mtd->suspend(mtd);
+               /* Disable the NFC clock */
+               clk_disable(host->clk);
+       }
 
        return ret;
 }
 
 static int mxcnd_resume(struct platform_device *pdev)
 {
-       struct mtd_info *info = platform_get_drvdata(pdev);
+       struct mtd_info *mtd = platform_get_drvdata(pdev);
+       struct nand_chip *nand_chip = mtd->priv;
+       struct mxc_nand_host *host = nand_chip->priv;
        int ret = 0;
 
        DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND resume\n");
-       /* Enable the NFC clock */
-       clk_enable(nfc_clk);    /* FIXME */
 
-       if (info)
-               info->resume(info);
+       if (mtd) {
+               /* Enable the NFC clock */
+               clk_enable(host->clk);
+               mtd->resume(mtd);
+       }
 
        return ret;
 }
@@ -1055,13 +1064,7 @@ static struct platform_driver mxcnd_driver = {
 
 static int __init mxc_nd_init(void)
 {
-       /* Register the device driver structure. */
-       pr_info("MXC MTD nand Driver\n");
-       if (platform_driver_probe(&mxcnd_driver, mxcnd_probe) != 0) {
-               printk(KERN_ERR "Driver register failed for mxcnd_driver\n");
-               return -ENODEV;
-       }
-       return 0;
+       return platform_driver_probe(&mxcnd_driver, mxcnd_probe);
 }
 
 static void __exit mxc_nd_cleanup(void)