[PATCH 1/3] nand: brcmnand: add bcmbca support

[Philippe REYNES <philippe.reynes@softathome.com>]

> Almost all Broadcom BCA (Broadband Carrier Access) platforms based on
> ARM use the same nand controller.
> So rather than adding a bcm6xxx_nand.c per Broadcom SoC, use a unified
> nand controller based on the existing one and selectable through
> NAND_BRCMNAND_BCMBCA.
> 
> The bcmbca controller should support all ARM based bcm63xxx, bcm68xx,
> bcm67xx and bcm490x SoCs.
> 
> Signed-off-by: Nicolas Heemeryck <nicolas.heemeryck@gmail.com>
> Cc: Philippe Reynes <philippe.reynes@softathome.com>

Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>

> ---
> drivers/mtd/nand/raw/Kconfig | 6 +
> drivers/mtd/nand/raw/brcmnand/Makefile | 1 +
> drivers/mtd/nand/raw/brcmnand/bcmbca_nand.c | 124 ++++++++++++++++++++
> 3 files changed, 131 insertions(+)
> create mode 100644 drivers/mtd/nand/raw/brcmnand/bcmbca_nand.c
> 
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 23201ca720..c37e2e96c2 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -102,6 +102,12 @@ config NAND_BRCMNAND_63158
> help
> Enable support for broadcom nand driver on bcm63158.
> 
> +config NAND_BRCMNAND_BCMBCA
> + bool "Support Broadcom NAND controller for BCA platforms"
> + depends on NAND_BRCMNAND && (ARM64 || CPU_V7A)
> + help
> + Enable support for broadcom nand driver for BCA platforms.
> +
> config NAND_DAVINCI
> bool "Support TI Davinci NAND controller"
> help
> diff --git a/drivers/mtd/nand/raw/brcmnand/Makefile
> b/drivers/mtd/nand/raw/brcmnand/Makefile
> index 5d9e7e3f3b..61203bf5ff 100644
> --- a/drivers/mtd/nand/raw/brcmnand/Makefile
> +++ b/drivers/mtd/nand/raw/brcmnand/Makefile
> @@ -5,5 +5,6 @@ obj-$(CONFIG_NAND_BRCMNAND_63158) += bcm63158_nand.o
> obj-$(CONFIG_NAND_BRCMNAND_68360) += bcm68360_nand.o
> obj-$(CONFIG_NAND_BRCMNAND_6838) += bcm6838_nand.o
> obj-$(CONFIG_NAND_BRCMNAND_6858) += bcm6858_nand.o
> +obj-$(CONFIG_NAND_BRCMNAND_BCMBCA) += bcmbca_nand.o
> obj-$(CONFIG_NAND_BRCMNAND) += brcmnand.o
> obj-$(CONFIG_NAND_BRCMNAND) += brcmnand_compat.o
> diff --git a/drivers/mtd/nand/raw/brcmnand/bcmbca_nand.c
> b/drivers/mtd/nand/raw/brcmnand/bcmbca_nand.c
> new file mode 100644
> index 0000000000..91b0a33397
> --- /dev/null
> +++ b/drivers/mtd/nand/raw/brcmnand/bcmbca_nand.c
> @@ -0,0 +1,124 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <memalign.h>
> +#include <nand.h>
> +#include <linux/errno.h>
> +#include <linux/io.h>
> +#include <linux/ioport.h>
> +#include <dm.h>
> +
> +#include "brcmnand.h"
> +
> +struct bcmbca_nand_soc {
> + struct brcmnand_soc soc;
> + void __iomem *base;
> +};
> +
> +#define BCMBCA_NAND_INT 0x00
> +#define BCMBCA_NAND_STATUS_SHIFT 0
> +#define BCMBCA_NAND_STATUS_MASK (0xfff << BCMBCA_NAND_STATUS_SHIFT)
> +
> +#define BCMBCA_NAND_INT_EN 0x04
> +#define BCMBCA_NAND_ENABLE_SHIFT 0
> +#define BCMBCA_NAND_ENABLE_MASK (0xffff << BCMBCA_NAND_ENABLE_SHIFT)
> +
> +enum {
> + BCMBCA_NP_READ = BIT(0),
> + BCMBCA_BLOCK_ERASE = BIT(1),
> + BCMBCA_COPY_BACK = BIT(2),
> + BCMBCA_PAGE_PGM = BIT(3),
> + BCMBCA_CTRL_READY = BIT(4),
> + BCMBCA_DEV_RBPIN = BIT(5),
> + BCMBCA_ECC_ERR_UNC = BIT(6),
> + BCMBCA_ECC_ERR_CORR = BIT(7),
> +};
> +
> +static bool bcmbca_nand_intc_ack(struct brcmnand_soc *soc)
> +{
> + struct bcmbca_nand_soc *priv =
> + container_of(soc, struct bcmbca_nand_soc, soc);
> + void __iomem *mmio = priv->base + BCMBCA_NAND_INT;
> + u32 val = brcmnand_readl(mmio);
> +
> + if (val & (BCMBCA_CTRL_READY << BCMBCA_NAND_STATUS_SHIFT)) {
> + /* Ack interrupt */
> + val &= ~BCMBCA_NAND_STATUS_MASK;
> + val |= BCMBCA_CTRL_READY << BCMBCA_NAND_STATUS_SHIFT;
> + brcmnand_writel(val, mmio);
> + return true;
> + }
> +
> + return false;
> +}
> +
> +static void bcmbca_nand_intc_set(struct brcmnand_soc *soc, bool en)
> +{
> + struct bcmbca_nand_soc *priv =
> + container_of(soc, struct bcmbca_nand_soc, soc);
> + void __iomem *mmio = priv->base + BCMBCA_NAND_INT_EN;
> + u32 val = brcmnand_readl(mmio);
> +
> + /* Don't ack any interrupts */
> + val &= ~BCMBCA_NAND_STATUS_MASK;
> +
> + if (en)
> + val |= BCMBCA_CTRL_READY << BCMBCA_NAND_ENABLE_SHIFT;
> + else
> + val &= ~(BCMBCA_CTRL_READY << BCMBCA_NAND_ENABLE_SHIFT);
> +
> + brcmnand_writel(val, mmio);
> +}
> +
> +static int bcmbca_nand_probe(struct udevice *dev)
> +{
> + struct udevice *pdev = dev;
> + struct bcmbca_nand_soc *priv = dev_get_priv(dev);
> + struct brcmnand_soc *soc;
> + struct resource res;
> +
> + soc = &priv->soc;
> +
> + dev_read_resource_byname(pdev, "nand-int-base", &res);
> + priv->base = devm_ioremap(dev, res.start, resource_size(&res));
> + if (IS_ERR(priv->base))
> + return PTR_ERR(priv->base);
> +
> + soc->ctlrdy_ack = bcmbca_nand_intc_ack;
> + soc->ctlrdy_set_enabled = bcmbca_nand_intc_set;
> +
> + /* Disable and ack all interrupts */
> + brcmnand_writel(0, priv->base + BCMBCA_NAND_INT_EN);
> + brcmnand_writel(0, priv->base + BCMBCA_NAND_INT);
> +
> + return brcmnand_probe(pdev, soc);
> +}
> +
> +static const struct udevice_id bcmbca_nand_dt_ids[] = {
> + { .compatible = "brcm,nand-bcmbca" },
> + { .compatible = "brcm,nand-bcm63158" },
> + { .compatible = "brcm,nand-bcm68360" },
> + { .compatible = "brcm,nand-bcm6858" },
> + { /* sentinel */ }
> +};
> +
> +U_BOOT_DRIVER(bcmbca_nand) = {
> + .name = "bcmbca-nand",
> + .id = UCLASS_MTD,
> + .of_match = bcmbca_nand_dt_ids,
> + .probe = bcmbca_nand_probe,
> + .priv_auto_alloc_size = sizeof(struct bcmbca_nand_soc),
> +};
> +
> +void board_nand_init(void)
> +{
> + struct udevice *dev;
> + int ret;
> +
> + ret = uclass_get_device_by_driver(UCLASS_MTD,
> + DM_GET_DRIVER(bcmbca_nand), &dev);
> + if (ret && ret != -ENODEV)
> + pr_err("Failed to initialize %s. (error %d)\n", dev->name,
> + ret);
> +}
> --
> 2.20.1