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Message-ID: <CAGt4E5tyANE-fiRNp=qZHLJLp+XCd0i74E0n2vgedQC5Rb46+g@mail.gmail.com>
Date: Mon, 18 Jul 2016 10:41:58 -0700
From: Markus Mayer <markus.mayer@...adcom.com>
To: Ray Jui <ray.jui@...adcom.com>
Cc: Brian Norris <computersforpeace@...il.com>,
Kamal Dasu <kdasu.kdev@...il.com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
David Woodhouse <dwmw2@...radead.org>,
linux-mtd@...ts.infradead.org,
BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
Prafulla Kota <prafulla.kota@...adcom.com>
Subject: Re: [PATCH 1/2] mtd: brcmnand: iProc big endian and ONFI support
On 18 July 2016 at 10:36, Ray Jui <ray.jui@...adcom.com> wrote:
> This patch adds big endian and ONFI support for various iProc based
> SoCs that use the core brcmstb NAND controller
>
> This patch was originally implemented by Prafulla Kota
> <prafulla.kota@...adcom.com> and fully tested on iProc based NS2 SVK
>
> Signed-off-by: Prafulla Kota <prafulla.kota@...adcom.com>
> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
> ---
> drivers/mtd/nand/brcmnand/brcmnand.c | 12 ++++++------
> drivers/mtd/nand/brcmnand/brcmnand.h | 13 ++++++++-----
> drivers/mtd/nand/brcmnand/iproc_nand.c | 17 +++++++++++++----
> 3 files changed, 27 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
> index b76ad7c..12a1585 100644
> --- a/drivers/mtd/nand/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/brcmnand/brcmnand.c
> @@ -1279,7 +1279,7 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
> u32 *flash_cache = (u32 *)ctrl->flash_cache;
> int i;
>
> - brcmnand_soc_data_bus_prepare(ctrl->soc);
> + brcmnand_soc_data_bus_prepare(ctrl->soc, true);
>
> /*
> * Must cache the FLASH_CACHE now, since changes in
> @@ -1292,7 +1292,7 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
> */
> flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));
>
> - brcmnand_soc_data_bus_unprepare(ctrl->soc);
> + brcmnand_soc_data_bus_unprepare(ctrl->soc, true);
>
> /* Cleanup from HW quirk: restore SECTOR_SIZE_1K */
> if (host->hwcfg.sector_size_1k)
> @@ -1508,12 +1508,12 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
> brcmnand_waitfunc(mtd, chip);
>
> if (likely(buf)) {
> - brcmnand_soc_data_bus_prepare(ctrl->soc);
> + brcmnand_soc_data_bus_prepare(ctrl->soc, false);
>
> for (j = 0; j < FC_WORDS; j++, buf++)
> *buf = brcmnand_read_fc(ctrl, j);
>
> - brcmnand_soc_data_bus_unprepare(ctrl->soc);
> + brcmnand_soc_data_bus_unprepare(ctrl->soc, false);
> }
>
> if (oob)
> @@ -1678,12 +1678,12 @@ static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
> (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
>
> if (buf) {
> - brcmnand_soc_data_bus_prepare(ctrl->soc);
> + brcmnand_soc_data_bus_prepare(ctrl->soc, false);
>
> for (j = 0; j < FC_WORDS; j++, buf++)
> brcmnand_write_fc(ctrl, j, *buf);
>
> - brcmnand_soc_data_bus_unprepare(ctrl->soc);
> + brcmnand_soc_data_bus_unprepare(ctrl->soc, false);
> } else if (oob) {
> for (j = 0; j < FC_WORDS; j++)
> brcmnand_write_fc(ctrl, j, 0xffffffff);
> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h
> index ef5eabb..5c44cd4 100644
> --- a/drivers/mtd/nand/brcmnand/brcmnand.h
> +++ b/drivers/mtd/nand/brcmnand/brcmnand.h
> @@ -23,19 +23,22 @@ struct dev_pm_ops;
> struct brcmnand_soc {
> bool (*ctlrdy_ack)(struct brcmnand_soc *soc);
> void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en);
> - void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare);
> + void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare,
> + bool is_param);
> };
>
> -static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc)
> +static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc,
> + bool is_param)
> {
> if (soc && soc->prepare_data_bus)
> - soc->prepare_data_bus(soc, true);
> + soc->prepare_data_bus(soc, true, is_param);
> }
>
> -static inline void brcmnand_soc_data_bus_unprepare(struct brcmnand_soc *soc)
> +static inline void brcmnand_soc_data_bus_unprepare(struct brcmnand_soc *soc,
> + bool is_param)
> {
> if (soc && soc->prepare_data_bus)
> - soc->prepare_data_bus(soc, false);
> + soc->prepare_data_bus(soc, false, is_param);
> }
>
> static inline u32 brcmnand_readl(void __iomem *addr)
> diff --git a/drivers/mtd/nand/brcmnand/iproc_nand.c b/drivers/mtd/nand/brcmnand/iproc_nand.c
> index 585596c..d98ca0b 100644
> --- a/drivers/mtd/nand/brcmnand/iproc_nand.c
> +++ b/drivers/mtd/nand/brcmnand/iproc_nand.c
> @@ -74,7 +74,8 @@ static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
> spin_unlock_irqrestore(&priv->idm_lock, flags);
> }
>
> -static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
> +static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare,
> + bool is_param)
> {
> struct iproc_nand_soc *priv =
> container_of(soc, struct iproc_nand_soc, soc);
> @@ -86,9 +87,17 @@ static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
>
> val = brcmnand_readl(mmio);
>
> - if (prepare)
> - val |= IPROC_NAND_APB_LE_MODE;
> - else
> + /*
> + * In the case of BE or when dealing with NAND data, alway configure
> + * the APB bus to LE mode before accessing the FIFO and back to BE mode
> + * after the access is done
> + */
> + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) || !is_param) {
> + if (prepare)
> + val |= IPROC_NAND_APB_LE_MODE;
> + else
> + val &= ~IPROC_NAND_APB_LE_MODE;
> + } else /* when in LE accessing the parameter page, keep APB in BE */
The coding guidelines state that if you need braces around one branch
of an if/else combination, you must use them on the other branch,
also, even if the other branch is just one line.
> val &= ~IPROC_NAND_APB_LE_MODE;
>
> brcmnand_writel(val, mmio);
> --
> 2.1.4
>
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