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mtd: mxc_nand: use 32bit copy functions

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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>
This commit is contained in:
Sascha Hauer 2012-05-29 10:16:09 +02:00 committed by David Woodhouse
parent 48f8b64129
commit 096bcc231f
1 changed files with 29 additions and 8 deletions
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37
drivers/mtd/nand/mxc_nand.c
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@ -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);