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Date: Mon, 22 Aug 2016 09:44:37 +0200
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Kamal Dasu <kdasu.kdev@...il.com>
Cc: Prafulla Kota <prafulla.kota@...adcom.com>,
linux-kernel@...r.kernel.org, Ray Jui <ray.jui@...adcom.com>,
"Jayachandran C <jchandra@...adcom.com>, bcm-kernel-feedback-list"
<bcm-kernel-feedback-list@...adcom.com>,
MTD Maling List <linux-mtd@...ts.infradead.org>,
Brian Norris <computersforpeace@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] mtd: brcmnand: iProc big endian and ONFI support
On Fri, 19 Aug 2016 11:14:17 -0400
Kamal Dasu <kdasu.kdev@...il.com> wrote:
> Boris
>
> This change looks good to me.
Is this an Acked-by or a Reviewed-by? :)
>
>
> On Wed, Aug 10, 2016 at 10:24 AM, Boris Brezillon
> <boris.brezillon@...e-electrons.com> wrote:
> > On Wed, 20 Jul 2016 14:53:50 -0700
> > 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
> >
> > Brian, Kamal, can you review this patch?
> >
> >>
> >> 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>
>
> Reviewed-by: Kamal Dasu <kdasu.kdev@...il.com>
>
> >> ---
> >> drivers/mtd/nand/brcmnand/brcmnand.c | 12 ++++++------
> >> drivers/mtd/nand/brcmnand/brcmnand.h | 13 ++++++++-----
> >> drivers/mtd/nand/brcmnand/iproc_nand.c | 18 ++++++++++++++----
> >> 3 files changed, 28 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..4c6ae11 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);
> >> @@ -86,10 +87,19 @@ 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 */
> >> val &= ~IPROC_NAND_APB_LE_MODE;
> >> + }
> >>
> >> brcmnand_writel(val, mmio);
> >>
> >
>
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