On Mon, 9 May 2016 14:51:18 +0800
Wenyou Yang <wenyou.yang@xxxxxxxxx> wrote:
> This reverts commit 5ddc7bd43ccc ("mtd: atmel_nand: Support variable
> RB_EDGE interrupts")
>
> Because for current SoCs, the RB_EDGE3(i.e. bit 27) of HSMC_SR
> register does not exist, the RB_EDGE0 (i.e. bit 24) is the ready/busy
> line edge status bit. It is a datasheet bug.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx>
Wenyou, I know you sent it before v4.6 was released, but now we should
probably add
Cc: <stable@xxxxxxxxxxxxxxx>
Brian, can you apply this patch directly in your tree (as previously
discussed, I'm not sure creating a nand/fixes branch is really useful)?
Thanks,
Boris
> ---
>
> .../devicetree/bindings/mtd/atmel-nand.txt | 2 +-
> drivers/mtd/nand/atmel_nand.c | 35 +++++-----------------
> drivers/mtd/nand/atmel_nand_nfc.h | 3 +-
> 3 files changed, 10 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
> index d53aba9..3e7ee99 100644
> --- a/Documentation/devicetree/bindings/mtd/atmel-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
> @@ -39,7 +39,7 @@ Optional properties:
>
> Nand Flash Controller(NFC) is an optional sub-node
> Required properties:
> -- compatible : "atmel,sama5d3-nfc" or "atmel,sama5d4-nfc".
> +- compatible : "atmel,sama5d3-nfc".
> - reg : should specify the address and size used for NFC command registers,
> NFC registers and NFC SRAM. NFC SRAM address and size can be absent
> if don't want to use it.
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index efc8ea2..68b9160 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -67,10 +67,6 @@ struct atmel_nand_caps {
> uint8_t pmecc_max_correction;
> };
>
> -struct atmel_nand_nfc_caps {
> - uint32_t rb_mask;
> -};
> -
> /*
> * oob layout for large page size
> * bad block info is on bytes 0 and 1
> @@ -129,7 +125,6 @@ struct atmel_nfc {
> /* Point to the sram bank which include readed data via NFC */
> void *data_in_sram;
> bool will_write_sram;
> - const struct atmel_nand_nfc_caps *caps;
> };
> static struct atmel_nfc nand_nfc;
>
> @@ -1715,9 +1710,9 @@ static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
> nfc_writel(host->nfc->hsmc_regs, IDR, NFC_SR_XFR_DONE);
> ret = IRQ_HANDLED;
> }
> - if (pending & host->nfc->caps->rb_mask) {
> + if (pending & NFC_SR_RB_EDGE) {
> complete(&host->nfc->comp_ready);
> - nfc_writel(host->nfc->hsmc_regs, IDR, host->nfc->caps->rb_mask);
> + nfc_writel(host->nfc->hsmc_regs, IDR, NFC_SR_RB_EDGE);
> ret = IRQ_HANDLED;
> }
> if (pending & NFC_SR_CMD_DONE) {
> @@ -1735,7 +1730,7 @@ static void nfc_prepare_interrupt(struct atmel_nand_host *host, u32 flag)
> if (flag & NFC_SR_XFR_DONE)
> init_completion(&host->nfc->comp_xfer_done);
>
> - if (flag & host->nfc->caps->rb_mask)
> + if (flag & NFC_SR_RB_EDGE)
> init_completion(&host->nfc->comp_ready);
>
> if (flag & NFC_SR_CMD_DONE)
> @@ -1753,7 +1748,7 @@ static int nfc_wait_interrupt(struct atmel_nand_host *host, u32 flag)
> if (flag & NFC_SR_XFR_DONE)
> comp[index++] = &host->nfc->comp_xfer_done;
>
> - if (flag & host->nfc->caps->rb_mask)
> + if (flag & NFC_SR_RB_EDGE)
> comp[index++] = &host->nfc->comp_ready;
>
> if (flag & NFC_SR_CMD_DONE)
> @@ -1821,7 +1816,7 @@ static int nfc_device_ready(struct mtd_info *mtd)
> dev_err(host->dev, "Lost the interrupt flags: 0x%08x\n",
> mask & status);
>
> - return status & host->nfc->caps->rb_mask;
> + return status & NFC_SR_RB_EDGE;
> }
>
> static void nfc_select_chip(struct mtd_info *mtd, int chip)
> @@ -1994,8 +1989,8 @@ static void nfc_nand_command(struct mtd_info *mtd, unsigned int command,
> }
> /* fall through */
> default:
> - nfc_prepare_interrupt(host, host->nfc->caps->rb_mask);
> - nfc_wait_interrupt(host, host->nfc->caps->rb_mask);
> + nfc_prepare_interrupt(host, NFC_SR_RB_EDGE);
> + nfc_wait_interrupt(host, NFC_SR_RB_EDGE);
> }
> }
>
> @@ -2426,11 +2421,6 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
> }
> }
>
> - nfc->caps = (const struct atmel_nand_nfc_caps *)
> - of_device_get_match_data(&pdev->dev);
> - if (!nfc->caps)
> - return -ENODEV;
> -
> nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
> nfc_readl(nfc->hsmc_regs, SR); /* clear the NFC_SR */
>
> @@ -2459,17 +2449,8 @@ static int atmel_nand_nfc_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static const struct atmel_nand_nfc_caps sama5d3_nfc_caps = {
> - .rb_mask = NFC_SR_RB_EDGE0,
> -};
> -
> -static const struct atmel_nand_nfc_caps sama5d4_nfc_caps = {
> - .rb_mask = NFC_SR_RB_EDGE3,
> -};
> -
> static const struct of_device_id atmel_nand_nfc_match[] = {
> - { .compatible = "atmel,sama5d3-nfc", .data = &sama5d3_nfc_caps },
> - { .compatible = "atmel,sama5d4-nfc", .data = &sama5d4_nfc_caps },
> + { .compatible = "atmel,sama5d3-nfc" },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, atmel_nand_nfc_match);
> diff --git a/drivers/mtd/nand/atmel_nand_nfc.h b/drivers/mtd/nand/atmel_nand_nfc.h
> index 0bbc1fa..4d5d262 100644
> --- a/drivers/mtd/nand/atmel_nand_nfc.h
> +++ b/drivers/mtd/nand/atmel_nand_nfc.h
> @@ -42,8 +42,7 @@
> #define NFC_SR_UNDEF (1 << 21)
> #define NFC_SR_AWB (1 << 22)
> #define NFC_SR_ASE (1 << 23)
> -#define NFC_SR_RB_EDGE0 (1 << 24)
> -#define NFC_SR_RB_EDGE3 (1 << 27)
> +#define NFC_SR_RB_EDGE (1 << 24)
>
> #define ATMEL_HSMC_NFC_IER 0x0c
> #define ATMEL_HSMC_NFC_IDR 0x10
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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