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SubjectRe: [PATCH v3 8/9] mtd: rawnand: ingenic: Add support for the JZ4725B
Hi Paul,

Paul Cercueil <paul@crapouillou.net> wrote on Mon, 4 Feb 2019 16:04:25
-0300:

> The boot ROM of the JZ4725B SoC expects a specific OOB layout on the
> NAND, so we use it unconditionally in the ingenic-nand driver.
>
> Also add the jz4725b-bch driver to support the JZ4725B-specific BCH
> hardware.
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>
> Changes:
>
> v2: Instead of forcing the OOB layout, leave it to the board code or
> devicetree to decide if the jz4725b-specific layout should be used
> or not.
>
> v3: - Revert the change in v2, as the previous behaviour was correct.
> - Also add support for the hardware BCH of the JZ4725B in this
> patch.
>
> drivers/mtd/nand/raw/ingenic/Kconfig | 10 ++
> drivers/mtd/nand/raw/ingenic/Makefile | 1 +
> drivers/mtd/nand/raw/ingenic/ingenic_nand.c | 48 +++++-
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c | 251 ++++++++++++++++++++++++++++
> 4 files changed, 309 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mtd/nand/raw/ingenic/jz4725b_bch.c
>
> diff --git a/drivers/mtd/nand/raw/ingenic/Kconfig b/drivers/mtd/nand/raw/ingenic/Kconfig
> index cc663cc15119..497b46b144f2 100644
> --- a/drivers/mtd/nand/raw/ingenic/Kconfig
> +++ b/drivers/mtd/nand/raw/ingenic/Kconfig
> @@ -27,6 +27,16 @@ config MTD_NAND_JZ4740_ECC
> This driver can also be built as a module. If so, the module
> will be called jz4740-ecc.
>
> +config MTD_NAND_JZ4725B_BCH
> + tristate "Hardware BCH support for JZ4725B SoC"
> + select MTD_NAND_INGENIC_ECC
> + help
> + Enable this driver to support the BCH error-correction hardware
> + present on the JZ4725B SoC from Ingenic.
> +
> + This driver can also be built as a module. If so, the module
> + will be called jz4725b-bch.
> +
> config MTD_NAND_JZ4780_BCH
> tristate "Hardware BCH support for JZ4780 SoC"
> select MTD_NAND_INGENIC_ECC
> diff --git a/drivers/mtd/nand/raw/ingenic/Makefile b/drivers/mtd/nand/raw/ingenic/Makefile
> index 563b7effcf59..ab2c5f47e5b7 100644
> --- a/drivers/mtd/nand/raw/ingenic/Makefile
> +++ b/drivers/mtd/nand/raw/ingenic/Makefile
> @@ -3,4 +3,5 @@ obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_nand.o
>
> obj-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
> obj-$(CONFIG_MTD_NAND_JZ4740_ECC) += jz4740_ecc.o
> +obj-$(CONFIG_MTD_NAND_JZ4725B_BCH) += jz4725b_bch.o
> obj-$(CONFIG_MTD_NAND_JZ4780_BCH) += jz4780_bch.o
> diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_nand.c b/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> index 3fd078920b17..0e6d79993ff3 100644
> --- a/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> +++ b/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> @@ -34,6 +34,7 @@ struct jz_soc_info {
> unsigned long data_offset;
> unsigned long addr_offset;
> unsigned long cmd_offset;
> + const struct mtd_ooblayout_ops *oob_layout;
> };
>
> struct ingenic_nand_cs {
> @@ -71,6 +72,41 @@ static inline struct ingenic_nfc *to_ingenic_nfc(struct nand_controller *ctrl)
> return container_of(ctrl, struct ingenic_nfc, controller);
> }
>
> +static int jz4725b_ooblayout_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct nand_ecc_ctrl *ecc = &chip->ecc;
> +
> + if (section || !ecc->total)
> + return -ERANGE;
> +
> + oobregion->length = ecc->total;
> + oobregion->offset = 3;
> +
> + return 0;
> +}
> +
> +static int jz4725b_ooblayout_free(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct nand_ecc_ctrl *ecc = &chip->ecc;
> +
> + if (section)
> + return -ERANGE;
> +
> + oobregion->length = mtd->oobsize - ecc->total - 3;
> + oobregion->offset = 3 + ecc->total;
> +
> + return 0;
> +}
> +
> +const struct mtd_ooblayout_ops jz4725b_ooblayout_ops = {
> + .ecc = jz4725b_ooblayout_ecc,
> + .free = jz4725b_ooblayout_free,
> +};
> +
> static void ingenic_nand_select_chip(struct nand_chip *chip, int chipnr)
> {
> struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
> @@ -211,7 +247,7 @@ static int ingenic_nand_attach_chip(struct nand_chip *chip)
> return -EINVAL;
> }
>
> - mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
> + mtd_set_ooblayout(mtd, nfc->soc_info->oob_layout);
>
> return 0;
> }
> @@ -407,16 +443,26 @@ static const struct jz_soc_info jz4740_soc_info = {
> .data_offset = 0x00000000,
> .cmd_offset = 0x00008000,
> .addr_offset = 0x00010000,
> + .oob_layout = &nand_ooblayout_lp_ops,
> +};
> +
> +static const struct jz_soc_info jz4725b_soc_info = {
> + .data_offset = 0x00000000,
> + .cmd_offset = 0x00008000,
> + .addr_offset = 0x00010000,
> + .oob_layout = &jz4725b_ooblayout_ops,
> };
>
> static const struct jz_soc_info jz4780_soc_info = {
> .data_offset = 0x00000000,
> .cmd_offset = 0x00400000,
> .addr_offset = 0x00800000,
> + .oob_layout = &nand_ooblayout_lp_ops,
> };
>
> static const struct of_device_id ingenic_nand_dt_match[] = {
> { .compatible = "ingenic,jz4740-nand", .data = &jz4740_soc_info },
> + { .compatible = "ingenic,jz4725b-nand", .data = &jz4725b_soc_info },
> { .compatible = "ingenic,jz4780-nand", .data = &jz4780_soc_info },
> {},
> };
> diff --git a/drivers/mtd/nand/raw/ingenic/jz4725b_bch.c b/drivers/mtd/nand/raw/ingenic/jz4725b_bch.c
> new file mode 100644
> index 000000000000..66be454be383
> --- /dev/null
> +++ b/drivers/mtd/nand/raw/ingenic/jz4725b_bch.c
> @@ -0,0 +1,251 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * JZ4725B BCH controller driver
> + *
> + * Copyright (C) 2018 Paul Cercueil <paul@crapouillou.net>
> + *
> + * Based on jz4780_bch.c
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#include "ingenic_ecc.h"
> +
> +#define BCH_BHCR 0x0
> +#define BCH_BHCSR 0x4
> +#define BCH_BHCCR 0x8
> +#define BCH_BHCNT 0xc
> +#define BCH_BHDR 0x10
> +#define BCH_BHPAR0 0x14
> +#define BCH_BHERR0 0x28
> +#define BCH_BHINT 0x24
> +#define BCH_BHINTES 0x3c
> +#define BCH_BHINTEC 0x40
> +#define BCH_BHINTE 0x38
> +
> +#define BCH_BHCR_BSEL_SHIFT 2
> +#define BCH_BHCR_BSEL_MASK (0x1 << BCH_BHCR_BSEL_SHIFT)
> +#define BCH_BHCR_ENCE BIT(3)
> +#define BCH_BHCR_INIT BIT(1)
> +#define BCH_BHCR_BCHE BIT(0)
> +
> +#define BCH_BHCNT_DEC_COUNT_SHIFT 16
> +#define BCH_BHCNT_DEC_COUNT_MASK (0x3ff << BCH_BHCNT_DEC_COUNT_SHIFT)
> +#define BCH_BHCNT_ENC_COUNT_SHIFT 0
> +#define BCH_BHCNT_ENC_COUNT_MASK (0x3ff << BCH_BHCNT_ENC_COUNT_SHIFT)
> +
> +#define BCH_BHERR_INDEX0_SHIFT 0
> +#define BCH_BHERR_INDEX0_MASK (0x1fff << BCH_BHERR_INDEX0_SHIFT)
> +#define BCH_BHERR_INDEX1_SHIFT 16
> +#define BCH_BHERR_INDEX1_MASK (0x1fff << BCH_BHERR_INDEX1_SHIFT)
> +
> +#define BCH_BHINT_ERRC_SHIFT 28
> +#define BCH_BHINT_ERRC_MASK (0xf << BCH_BHINT_ERRC_SHIFT)
> +#define BCH_BHINT_TERRC_SHIFT 16
> +#define BCH_BHINT_TERRC_MASK (0x7f << BCH_BHINT_TERRC_SHIFT)
> +#define BCH_BHINT_ALL_0 BIT(5)
> +#define BCH_BHINT_ALL_F BIT(4)
> +#define BCH_BHINT_DECF BIT(3)
> +#define BCH_BHINT_ENCF BIT(2)
> +#define BCH_BHINT_UNCOR BIT(1)
> +#define BCH_BHINT_ERR BIT(0)
> +
> +/* Timeout for BCH calculation/correction. */
> +#define BCH_TIMEOUT_US 100000
> +
> +static void jz4725b_bch_init(struct ingenic_ecc *bch,
> + struct ingenic_ecc_params *params, bool encode)

I don't know the IP but 'encode' looks strange, what is it supposed to
mean?

> +{
> + u32 reg;
> +
> + /* Clear interrupt status. */
> + writel(readl(bch->base + BCH_BHINT), bch->base + BCH_BHINT);
> +
> + /* Initialise and enable BCH. */
> + writel(0x1f, bch->base + BCH_BHCCR);
> + writel(BCH_BHCR_BCHE, bch->base + BCH_BHCSR);
> +
> + if (params->strength == 8)
> + writel(BCH_BHCR_BSEL_MASK, bch->base + BCH_BHCSR);
> + else
> + writel(BCH_BHCR_BSEL_MASK, bch->base + BCH_BHCCR);

Here you write to BCH_BHCSR or BCH_BHCCR depending on
params->strength...

> +
> + if (encode)
> + writel(BCH_BHCR_ENCE, bch->base + BCH_BHCSR);
> + else
> + writel(BCH_BHCR_ENCE, bch->base + BCH_BHCCR);

...and here depending on encode.

Can you explain a bit?

> +
> + writel(BCH_BHCR_INIT, bch->base + BCH_BHCSR);
> +
> + /* Set up BCH count register. */
> + reg = params->size << BCH_BHCNT_ENC_COUNT_SHIFT;
> + reg |= (params->size + params->bytes) << BCH_BHCNT_DEC_COUNT_SHIFT;

Maybe you want to check params->size to fit the bitfield length?

> + writel(reg, bch->base + BCH_BHCNT);
> +}
> +
> +static void jz4725b_bch_disable(struct ingenic_ecc *bch)
> +{
> + writel(readl(bch->base + BCH_BHINT), bch->base + BCH_BHINT);
> + writel(BCH_BHCR_BCHE, bch->base + BCH_BHCCR);

I would add comments, one to say you clear the interrupts, one when you
disable the engine.

> +}
> +
> +static void jz4725b_bch_write_data(struct ingenic_ecc *bch, const u8 *buf,
> + size_t size)
> +{
> + while (size--)
> + writeb(*buf++, bch->base + BCH_BHDR);
> +}
> +
> +static void jz4725b_bch_read_parity(struct ingenic_ecc *bch, u8 *buf,
> + size_t size)
> +{
> + size_t size32 = size / sizeof(u32);
> + size_t size8 = size % sizeof(u32);
> + u32 *dest32;
> + u8 *dest8;
> + u32 val, offset = 0;
> +
> + dest32 = (u32 *)buf;
> + while (size32--) {
> + *dest32++ = readl(bch->base + BCH_BHPAR0 + offset);
> + offset += sizeof(u32);
> + }
> +
> + dest8 = (u8 *)dest32;
> + val = readl(bch->base + BCH_BHPAR0 + offset);
> + switch (size8) {
> + case 3:
> + dest8[2] = (val >> 16) & 0xff;
> + case 2:
> + dest8[1] = (val >> 8) & 0xff;
> + case 1:
> + dest8[0] = val & 0xff;
> + break;
> + }
> +}

Have you tried with _relaxed operators?

> +
> +static bool jz4725b_bch_wait_complete(struct ingenic_ecc *bch, unsigned int irq,
> + u32 *status)
> +{
> + u32 reg;
> + int ret;
> +
> + /*
> + * While we could use interrupts here and sleep until the operation
> + * completes, the controller works fairly quickly (usually a few
> + * microseconds) and so the overhead of sleeping until we get an
> + * interrupt quite noticeably decreases performance.
> + */
> + ret = readl_poll_timeout(bch->base + BCH_BHINT, reg,
> + (reg & irq) == irq, 0, BCH_TIMEOUT_US);

I suppose (reg & irq) is enough?

> + if (ret)
> + return false;
> +
> + if (status)
> + *status = reg;
> +
> + writel(reg, bch->base + BCH_BHINT);

space

> + return true;
> +}
> +
> +static int jz4725b_calculate(struct ingenic_ecc *bch,
> + struct ingenic_ecc_params *params,
> + const u8 *buf, u8 *ecc_code)
> +{
> + int ret = 0;
> +
> + mutex_lock(&bch->lock);
> + jz4725b_bch_init(bch, params, true);
> + jz4725b_bch_write_data(bch, buf, params->size);
> +
> + if (jz4725b_bch_wait_complete(bch, BCH_BHINT_ENCF, NULL)) {

I would prefer bch_wait_complete() to return an usual negative error
instead of a boolean.

And maybe a goto could be used in case of error to disable BCH, unlock
the mutex and return.

> + jz4725b_bch_read_parity(bch, ecc_code, params->bytes);
> + } else {
> + dev_err(bch->dev, "timed out while calculating ECC\n");
> + ret = -ETIMEDOUT;
> + }
> +
> + jz4725b_bch_disable(bch);
> + mutex_unlock(&bch->lock);

Space

> + return ret;
> +}
> +
> +static int jz4725b_correct(struct ingenic_ecc *bch,
> + struct ingenic_ecc_params *params,
> + u8 *buf, u8 *ecc_code)
> +{
> + u32 reg, errors, bit;
> + unsigned int i;
> + int ret = 0;
> +
> + mutex_lock(&bch->lock);
> +
> + jz4725b_bch_init(bch, params, false);
> + jz4725b_bch_write_data(bch, buf, params->size);
> + jz4725b_bch_write_data(bch, ecc_code, params->bytes);
> +
> + if (!jz4725b_bch_wait_complete(bch, BCH_BHINT_DECF, &reg)) {
> + dev_err(bch->dev, "timed out while correcting data\n");
> + ret = -ETIMEDOUT;
> + goto out;
> + }
> +
> + if (reg & (BCH_BHINT_ALL_F | BCH_BHINT_ALL_0)) {
> + /* Data and ECC is all 0xff or 0x00 - nothing to correct */
> + ret = 0;
> + goto out;
> + }
> +
> + if (reg & BCH_BHINT_UNCOR) {
> + /* Uncorrectable ECC error */
> + ret = -EBADMSG;
> + goto out;
> + }
> +
> + errors = (reg & BCH_BHINT_ERRC_MASK) >> BCH_BHINT_ERRC_SHIFT;
> +
> + /* Correct any detected errors. */
> + for (i = 0; i < errors; i++) {
> + if (i & 1) {
> + bit = (reg & BCH_BHERR_INDEX1_MASK) >> BCH_BHERR_INDEX1_SHIFT;
> + } else {
> + reg = readl(bch->base + BCH_BHERR0 + (i * 4));
> + bit = (reg & BCH_BHERR_INDEX0_MASK) >> BCH_BHERR_INDEX0_SHIFT;
> + }
> +
> + buf[(bit >> 3)] ^= BIT(bit & 0x7);
> + }
> +
> +out:
> + jz4725b_bch_disable(bch);
> + mutex_unlock(&bch->lock);
> + return ret;
> +}
> +
> +static const struct ingenic_ecc_ops jz4725b_bch_ops = {
> + .disable = jz4725b_bch_disable,
> + .calculate = jz4725b_calculate,
> + .correct = jz4725b_correct,
> +};
> +
> +static const struct of_device_id jz4725b_bch_dt_match[] = {
> + { .compatible = "ingenic,jz4725b-bch", .data = &jz4725b_bch_ops },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, jz4725b_bch_dt_match);
> +
> +static struct platform_driver jz4725b_bch_driver = {
> + .probe = ingenic_ecc_probe,
> + .driver = {
> + .name = "jz4725b-bch",
> + .of_match_table = jz4725b_bch_dt_match,
> + },
> +};
> +module_platform_driver(jz4725b_bch_driver);

Missing MODULE_ macros? (author, license)


Thanks,
Miquèl

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