mtd: mxc_nand: use 32bit copy functions

The following commit changes the function used to copy from/to
the hardware buffer to memcpy_[from|to]io. This does not work
since the hardware cannot handle the byte accesses used by these
functions. Instead of reverting this patch introduce 32bit
correspondents of these functions.

| commit 5775ba36ea9c760c2d7e697dac04f2f7fc95aa62
| Author: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
| Date:   Tue Apr 24 10:05:22 2012 +0200
|
|    mtd: mxc_nand: fix several sparse warnings about incorrect address space
|
|     Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
|     Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.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 c58e6a9..6acc790 100644 (file)
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -273,6 +273,26 @@ static struct nand_ecclayout nandv2_hw_eccoob_4k = {
 
 static const char *part_probes[] = { "RedBoot", "cmdlinepart", "ofpart", NULL };
 
+static void memcpy32_fromio(void *trg, const void __iomem  *src, size_t size)
+{
+       int i;
+       u32 *t = trg;
+       const __iomem u32 *s = src;
+
+       for (i = 0; i < (size >> 2); i++)
+               *t++ = __raw_readl(s++);
+}
+
+static void memcpy32_toio(void __iomem *trg, const void *src, int size)
+{
+       int i;
+       u32 __iomem *t = trg;
+       const u32 *s = src;
+
+       for (i = 0; i < (size >> 2); i++)
+               __raw_writel(*s++, t++);
+}
+
 static int check_int_v3(struct mxc_nand_host *host)
 {
        uint32_t tmp;
@@ -519,7 +539,7 @@ static void send_read_id_v3(struct mxc_nand_host *host)
 
        wait_op_done(host, true);
 
-       memcpy_fromio(host->data_buf, host->main_area0, 16);
+       memcpy32_fromio(host->data_buf, host->main_area0, 16);
 }
 
 /* Request the NANDFC to perform a read of the NAND device ID. */
@@ -535,7 +555,7 @@ static void send_read_id_v1_v2(struct mxc_nand_host *host)
        /* Wait for operation to complete */
        wait_op_done(host, true);
 
-       memcpy_fromio(host->data_buf, host->main_area0, 16);
+       memcpy32_fromio(host->data_buf, host->main_area0, 16);
 
        if (this->options & NAND_BUSWIDTH_16) {
                /* compress the ID info */
@@ -797,16 +817,16 @@ static void copy_spare(struct mtd_info *mtd, bool bfrom)
 
        if (bfrom) {
                for (i = 0; i < n - 1; i++)
-                       memcpy_fromio(d + i * j, s + i * t, j);
+                       memcpy32_fromio(d + i * j, s + i * t, j);
 
                /* the last section */
-               memcpy_fromio(d + i * j, s + i * t, mtd->oobsize - i * j);
+               memcpy32_fromio(d + i * j, s + i * t, mtd->oobsize - i * j);
        } else {
                for (i = 0; i < n - 1; i++)
-                       memcpy_toio(&s[i * t], &d[i * j], j);
+                       memcpy32_toio(&s[i * t], &d[i * j], j);
 
                /* the last section */
-               memcpy_toio(&s[i * t], &d[i * j], mtd->oobsize - i * j);
+               memcpy32_toio(&s[i * t], &d[i * j], mtd->oobsize - i * j);
        }
 }
 
@@ -1070,7 +1090,8 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
 
                host->devtype_data->send_page(mtd, NFC_OUTPUT);
 
-               memcpy_fromio(host->data_buf, host->main_area0, mtd->writesize);
+               memcpy32_fromio(host->data_buf, host->main_area0,
+                               mtd->writesize);
                copy_spare(mtd, true);
                break;
 
@@ -1086,7 +1107,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
                break;
 
        case NAND_CMD_PAGEPROG:
-               memcpy_toio(host->main_area0, host->data_buf, mtd->writesize);
+               memcpy32_toio(host->main_area0, host->data_buf, mtd->writesize);
                copy_spare(mtd, false);
                host->devtype_data->send_page(mtd, NFC_INPUT);
                host->devtype_data->send_cmd(host, command, true);