Re: [PATCH v2 1/6] mtd: nand: gpmi: add GPMI NAND support for i.MX7D

Boris Brezillon
2016-06-14T20:05:37Z

On Fri, 10 Jun 2016 12:01:29 -0500
Han Xu <han.xu@nxp.com> wrote:

> support GPMI NAND on i.MX7D

I see that a lot of conditional path are testing NAND_IS_MXn(X).
That would probably a good thing to move all these different code
blocks into their own functions, and declare function pointers in
struct gpmi_devdata to avoid doing these tests.

The same goes for all the macros that are testing the controller
revision.

That's not something I'm asking you to modify in this series, but a
future possible improvement.

>
> Signed-off-by: Han Xu <han.xu@nxp.com>
> ---
> drivers/mtd/nand/gpmi-nand/bch-regs.h | 14 +++++++-------
> drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 10 ++++++----
> drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 30 ++++++++++++++++++++++++------
> drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 7 +++++--
> 4 files changed, 42 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h b/drivers/mtd/nand/gpmi-nand/bch-regs.h
> index 05bb91f..228142c 100644
> --- a/drivers/mtd/nand/gpmi-nand/bch-regs.h
> +++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h
> @@ -1,7 +1,7 @@
> /*
> * Freescale GPMI NAND Flash Driver
> *
> - * Copyright 2008-2011 Freescale Semiconductor, Inc.
> + * Copyright 2008-2016 Freescale Semiconductor, Inc.
> * Copyright 2008 Embedded Alley Solutions, Inc.
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -54,7 +54,7 @@
> #define MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0 11
> #define MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0 (0x1f << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)
> #define BF_BCH_FLASH0LAYOUT0_ECC0(v, x) \
> - (GPMI_IS_MX6(x) \
> + ((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) \
> ? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0) \
> & MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0) \
> : (((v) << BP_BCH_FLASH0LAYOUT0_ECC0) \
> @@ -65,7 +65,7 @@
> #define MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14 \
> (0x1 << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)
> #define BF_BCH_FLASH0LAYOUT0_GF(v, x) \
> - ((GPMI_IS_MX6(x) && ((v) == 14)) \
> + (((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14)) \
> ? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14) \
> & MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14) \
> : 0 \
> @@ -77,7 +77,7 @@
> #define MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE \
> (0x3ff << BP_BCH_FLASH0LAYOUT0_DATA0_SIZE)
> #define BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(v, x) \
> - (GPMI_IS_MX6(x) \
> + ((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) \
> ? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE) \
> : ((v) & BM_BCH_FLASH0LAYOUT0_DATA0_SIZE) \
> )
> @@ -96,7 +96,7 @@
> #define MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN 11
> #define MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN (0x1f << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)
> #define BF_BCH_FLASH0LAYOUT1_ECCN(v, x) \
> - (GPMI_IS_MX6(x) \
> + ((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) \
> ? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN) \
> & MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN) \
> : (((v) << BP_BCH_FLASH0LAYOUT1_ECCN) \
> @@ -107,7 +107,7 @@
> #define MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14 \
> (0x1 << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)
> #define BF_BCH_FLASH0LAYOUT1_GF(v, x) \
> - ((GPMI_IS_MX6(x) && ((v) == 14)) \
> + (((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14)) \
> ? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14) \
> & MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14) \
> : 0 \
> @@ -119,7 +119,7 @@
> #define MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE \
> (0x3ff << BP_BCH_FLASH0LAYOUT1_DATAN_SIZE)
> #define BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(v, x) \
> - (GPMI_IS_MX6(x) \
> + ((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) \
> ? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE) \
> : ((v) & BM_BCH_FLASH0LAYOUT1_DATAN_SIZE) \
> )
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> index 0f68a99..358ff5d 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> @@ -1,7 +1,7 @@
> /*
> * Freescale GPMI NAND Flash Driver
> *
> - * Copyright (C) 2008-2011 Freescale Semiconductor, Inc.
> + * Copyright (C) 2008-2016 Freescale Semiconductor, Inc.
> * Copyright (C) 2008 Embedded Alley Solutions, Inc.
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -971,7 +971,8 @@ int gpmi_extra_init(struct gpmi_nand_data *this)
> struct nand_chip *chip = &this->nand;
>
> /* Enable the asynchronous EDO feature. */
> - if (GPMI_IS_MX6(this) && chip->onfi_version) {
> + if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
> + chip->onfi_version) {
> int mode = onfi_get_async_timing_mode(chip);
>
> /* We only support the timing mode 4 and mode 5. */
> @@ -1093,12 +1094,13 @@ int gpmi_is_ready(struct gpmi_nand_data *this, unsigned chip)
> if (GPMI_IS_MX23(this)) {
> mask = MX23_BM_GPMI_DEBUG_READY0 << chip;
> reg = readl(r->gpmi_regs + HW_GPMI_DEBUG);
> - } else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this)) {
> + } else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this) ||
> + GPMI_IS_MX7(this)) {
> /*
> * In the imx6, all the ready/busy pins are bound
> * together. So we only need to check chip 0.
> */
> - if (GPMI_IS_MX6(this))
> + if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
> chip = 0;
>
> /* MX28 shares the same R/B register as MX6Q. */
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 6e46156..a8936fd 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -1,7 +1,7 @@
> /*
> * Freescale GPMI NAND Flash Driver
> *
> - * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
> + * Copyright (C) 2010-2016 Freescale Semiconductor, Inc.
> * Copyright (C) 2008 Embedded Alley Solutions, Inc.
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -110,6 +110,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6sx = {
> .max_chain_delay = 12,
> };
>
> +static const struct gpmi_devdata gpmi_devdata_imx7d = {
> + .type = IS_MX7D,
> + .bch_max_ecc_strength = 62,
> + .max_chain_delay = 12,
> +};
> +
> static irqreturn_t bch_irq(int irq, void *cookie)
> {
> struct gpmi_nand_data *this = cookie;
> @@ -601,6 +607,10 @@ static char *extra_clks_for_mx6q[GPMI_CLK_MAX] = {
> "gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch",
> };
>
> +static char *extra_clks_for_mx7d[GPMI_CLK_MAX] = {
> + "gpmi_bch_apb",
> +};
> +
> static int gpmi_get_clks(struct gpmi_nand_data *this)
> {
> struct resources *r = &this->resources;
> @@ -618,6 +628,8 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
> /* Get extra clocks */
> if (GPMI_IS_MX6(this))
> extra_clks = extra_clks_for_mx6q;
> + if (GPMI_IS_MX7(this))
> + extra_clks = extra_clks_for_mx7d;
> if (!extra_clks)
> return 0;
>
> @@ -634,7 +646,7 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
> r->clock[i] = clk;
> }
>
> - if (GPMI_IS_MX6(this))
> + if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
> /*
> * Set the default value for the gpmi clock.
> *
> @@ -1965,8 +1977,8 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
> * (1) the chip is imx6, and
> * (2) the size of the ECC parity is byte aligned.
> */
> - if (GPMI_IS_MX6(this) &&
> - ((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {
> + if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
> + ((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {
> ecc->read_subpage = gpmi_ecc_read_subpage;
> chip->options |= NAND_SUBPAGE_READ;
> }
> @@ -1987,6 +1999,7 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
> struct nand_chip *chip = &this->nand;
> struct mtd_info *mtd = nand_to_mtd(chip);
> int ret;
> + int max_chips;
>
> /* init current chip */
> this->current_chip = -1;
> @@ -2021,7 +2034,8 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
> if (ret)
> goto err_out;
>
> - ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL);
> + max_chips = (GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) ? 2 : 1;
> + ret = nand_scan_ident(mtd, max_chips, NULL);
> if (ret)
> goto err_out;
>
> @@ -2074,7 +2088,11 @@ static const struct of_device_id gpmi_nand_id_table[] = {
> }, {
> .compatible = "fsl,imx6sx-gpmi-nand",
> .data = &gpmi_devdata_imx6sx,
> - }, {}
> + }, {
> + .compatible = "fsl,imx7d-gpmi-nand",
> + .data = &gpmi_devdata_imx7d,
> + }, { /* sentinel */ }
> +
> };
> MODULE_DEVICE_TABLE(of, gpmi_nand_id_table);
>
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> index 4e49a1f..04a3584 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> @@ -1,7 +1,7 @@
> /*
> * Freescale GPMI NAND Flash Driver
> *
> - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
> + * Copyright (C) 2010-2016 Freescale Semiconductor, Inc.
> * Copyright (C) 2008 Embedded Alley Solutions, Inc.
> *
> * This program is free software; you can redistribute it and/or modify
> @@ -123,7 +123,8 @@ enum gpmi_type {
> IS_MX23,
> IS_MX28,
> IS_MX6Q,
> - IS_MX6SX
> + IS_MX6SX,
> + IS_MX7D,
> };
>
> struct gpmi_devdata {
> @@ -305,6 +306,8 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
> #define GPMI_IS_MX28(x) ((x)->devdata->type == IS_MX28)
> #define GPMI_IS_MX6Q(x) ((x)->devdata->type == IS_MX6Q)
> #define GPMI_IS_MX6SX(x) ((x)->devdata->type == IS_MX6SX)
> +#define GPMI_IS_MX7D(x) ((x)->devdata->type == IS_MX7D)
>
> #define GPMI_IS_MX6(x) (GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x))
> +#define GPMI_IS_MX7(x) (GPMI_IS_MX7D(x))
> #endif

--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering