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da94b00df5
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.11 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 47252
79 lines
2.5 KiB
Diff
79 lines
2.5 KiB
Diff
From b1488f1a55da6a297ac4e8e9140922f35b7583c5 Mon Sep 17 00:00:00 2001
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From: Boris Brezillon <boris.brezillon@free-electrons.com>
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Date: Mon, 15 Jun 2015 11:09:58 +0200
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Subject: [PATCH] nand: sunxi: fix write to USER_DATA reg
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The USER_DATA register cannot be updated with readb on A13 SoCs, thus
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triggering a bug when using memcpy_toio on this register.
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Use writel (plus a temporary variable to old the USER_DATA value) to
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address that problem.
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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---
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drivers/mtd/nand/sunxi_nand.c | 38 +++++++++++++++++++++-----------------
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1 file changed, 21 insertions(+), 17 deletions(-)
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--- a/drivers/mtd/nand/sunxi_nand.c
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+++ b/drivers/mtd/nand/sunxi_nand.c
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@@ -908,7 +908,7 @@ static int sunxi_nfc_hw_ecc_write_page(s
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for (i = 0; i < ecc->steps; i++) {
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bool rndactiv = false;
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- u8 oob_buf[4];
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+ u32 user_data;
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if (i)
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chip->cmdfunc(mtd, NAND_CMD_RNDIN, i * ecc->size, -1);
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@@ -919,15 +919,13 @@ static int sunxi_nfc_hw_ecc_write_page(s
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offset = layout->eccpos[i * ecc->bytes] - 4 + mtd->writesize;
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/* Fill OOB data in */
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- if (!oob_required)
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- memset(oob_buf, 0xff, 4);
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- else
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- memcpy(oob_buf,
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- chip->oob_poi + layout->oobfree[i].offset,
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- 4);
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-
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-
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- memcpy_toio(nfc->regs + NFC_REG_USER_DATA_BASE, oob_buf, 4);
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+ if (!oob_required) {
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+ user_data = 0xffffffff;
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+ } else {
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+ memcpy(&user_data,
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+ chip->oob_poi + layout->oobfree[i].offset, 4);
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+ user_data = le32_to_cpu(user_data);
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+ }
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if (i) {
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cnt = ecc->bytes + 4;
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@@ -946,12 +944,16 @@ static int sunxi_nfc_hw_ecc_write_page(s
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if (rndactiv) {
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/* pre randomize to generate FF patterns on the NAND */
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if (!i) {
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+ u8 oob_tmp[2];
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u16 state = rnd->subseeds[rnd->page % rnd->nseeds];
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+ oob_tmp[0] = user_data;
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+ oob_tmp[1] = user_data >> 8;
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state = sunxi_nfc_hwrnd_single_step(state, 15);
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- oob_buf[0] ^= state;
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+ oob_tmp[0] ^= state;
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state = sunxi_nfc_hwrnd_step(rnd, state, 1);
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- oob_buf[1] ^= state;
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- memcpy_toio(nfc->regs + NFC_REG_USER_DATA_BASE, oob_buf, 4);
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+ oob_tmp[1] ^= state;
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+ user_data &= ~0xffff;
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+ user_data |= oob_tmp[0] | (oob_tmp[1] << 8);
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}
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tmp = readl(nfc->regs + NFC_REG_ECC_CTL);
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tmp &= ~(NFC_RANDOM_DIRECTION | NFC_ECC_EXCEPTION);
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@@ -959,6 +961,8 @@ static int sunxi_nfc_hw_ecc_write_page(s
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writel(tmp, nfc->regs + NFC_REG_ECC_CTL);
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}
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+ writel(user_data, nfc->regs + NFC_REG_USER_DATA_BASE);
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+
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chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset, -1);
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ret = sunxi_nfc_wait_cmd_fifo_empty(nfc);
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