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From b1488f1a55da6a297ac4e8e9140922f35b7583c5 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@free-electrons.com>
Date: Mon, 15 Jun 2015 11:09:58 +0200
Subject: [PATCH] nand: sunxi: fix write to USER_DATA reg
The USER_DATA register cannot be updated with readb on A13 SoCs, thus
triggering a bug when using memcpy_toio on this register.
Use writel (plus a temporary variable to old the USER_DATA value) to
address that problem.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/mtd/nand/sunxi_nand.c | 38 +++++++++++++++++++++-----------------
1 file changed, 21 insertions(+), 17 deletions(-)
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -908,7 +908,7 @@ static int sunxi_nfc_hw_ecc_write_page(s
for (i = 0; i < ecc->steps; i++) {
bool rndactiv = false;
- u8 oob_buf[4];
+ u32 user_data;
if (i)
chip->cmdfunc(mtd, NAND_CMD_RNDIN, i * ecc->size, -1);
@@ -919,15 +919,13 @@ static int sunxi_nfc_hw_ecc_write_page(s
offset = layout->eccpos[i * ecc->bytes] - 4 + mtd->writesize;
/* Fill OOB data in */
- if (!oob_required)
- memset(oob_buf, 0xff, 4);
- else
- memcpy(oob_buf,
- chip->oob_poi + layout->oobfree[i].offset,
- 4);
-
-
- memcpy_toio(nfc->regs + NFC_REG_USER_DATA_BASE, oob_buf, 4);
+ if (!oob_required) {
+ user_data = 0xffffffff;
+ } else {
+ memcpy(&user_data,
+ chip->oob_poi + layout->oobfree[i].offset, 4);
+ user_data = le32_to_cpu(user_data);
+ }
if (i) {
cnt = ecc->bytes + 4;
@@ -946,12 +944,16 @@ static int sunxi_nfc_hw_ecc_write_page(s
if (rndactiv) {
/* pre randomize to generate FF patterns on the NAND */
if (!i) {
+ u8 oob_tmp[2];
u16 state = rnd->subseeds[rnd->page % rnd->nseeds];
+ oob_tmp[0] = user_data;
+ oob_tmp[1] = user_data >> 8;
state = sunxi_nfc_hwrnd_single_step(state, 15);
- oob_buf[0] ^= state;
+ oob_tmp[0] ^= state;
state = sunxi_nfc_hwrnd_step(rnd, state, 1);
- oob_buf[1] ^= state;
- memcpy_toio(nfc->regs + NFC_REG_USER_DATA_BASE, oob_buf, 4);
+ oob_tmp[1] ^= state;
+ user_data &= ~0xffff;
+ user_data |= oob_tmp[0] | (oob_tmp[1] << 8);
}
tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
tmp &= ~(NFC_RANDOM_DIRECTION | NFC_ECC_EXCEPTION);
@@ -959,6 +961,8 @@ static int sunxi_nfc_hw_ecc_write_page(s
writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
}
+ writel(user_data, nfc->regs + NFC_REG_USER_DATA_BASE);
+
chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset, -1);
ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
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