nand: brcm: add BCM6368 support

This adds support for BCM6368, BCM6328, BCM6362 and BCM63268 SoCs.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

drivers/mtd/nand/raw/Kconfig

@@ -72,6 +72,12 @@ config NAND_BRCMNAND
 	  Enable the driver for NAND flash on platforms using a Broadcom NAND
 	  controller.
 
+config NAND_BRCMNAND_6368
+	bool "Support Broadcom NAND controller on bcm6368"
+	depends on NAND_BRCMNAND && ARCH_BMIPS
+	help
+	  Enable support for broadcom nand driver on bcm6368.
+
 config NAND_BRCMNAND_6838
        bool "Support Broadcom NAND controller on bcm6838"
        depends on NAND_BRCMNAND && ARCH_BMIPS && SOC_BMIPS_BCM6838

drivers/mtd/nand/raw/brcmnand/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 
+obj-$(CONFIG_NAND_BRCMNAND_6368) += bcm6368_nand.o
 obj-$(CONFIG_NAND_BRCMNAND_63158) += bcm63158_nand.o
 obj-$(CONFIG_NAND_BRCMNAND_6838) += bcm6838_nand.o
 obj-$(CONFIG_NAND_BRCMNAND_6858) += bcm6858_nand.o

drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c

@@ -0,0 +1,117 @@
+// 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 bcm6368_nand_soc {
+	struct brcmnand_soc soc;
+	void __iomem *base;
+};
+
+#define soc_to_priv(_soc) container_of(_soc, struct bcm6368_nand_soc, soc)
+
+#define BCM6368_NAND_INT		0x00
+#define  BCM6368_NAND_STATUS_SHIFT	0
+#define  BCM6368_NAND_STATUS_MASK	(0xfff << BCM6368_NAND_STATUS_SHIFT)
+#define  BCM6368_NAND_ENABLE_SHIFT	16
+#define  BCM6368_NAND_ENABLE_MASK	(0xffff << BCM6368_NAND_ENABLE_SHIFT)
+
+enum {
+	BCM6368_NP_READ		= BIT(0),
+	BCM6368_BLOCK_ERASE	= BIT(1),
+	BCM6368_COPY_BACK	= BIT(2),
+	BCM6368_PAGE_PGM	= BIT(3),
+	BCM6368_CTRL_READY	= BIT(4),
+	BCM6368_DEV_RBPIN	= BIT(5),
+	BCM6368_ECC_ERR_UNC	= BIT(6),
+	BCM6368_ECC_ERR_CORR	= BIT(7),
+};
+
+static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
+{
+	struct bcm6368_nand_soc *priv = soc_to_priv(soc);
+	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
+	u32 val = brcmnand_readl(mmio);
+
+	if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
+		/* Ack interrupt */
+		val &= ~BCM6368_NAND_STATUS_MASK;
+		val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
+		brcmnand_writel(val, mmio);
+		return true;
+	}
+
+	return false;
+}
+
+static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+	struct bcm6368_nand_soc *priv = soc_to_priv(soc);
+	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
+	u32 val = brcmnand_readl(mmio);
+
+	/* Don't ack any interrupts */
+	val &= ~BCM6368_NAND_STATUS_MASK;
+
+	if (en)
+		val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
+	else
+		val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);
+
+	brcmnand_writel(val, mmio);
+}
+
+static int bcm6368_nand_probe(struct udevice *dev)
+{
+	struct bcm6368_nand_soc *priv = dev_get_priv(dev);
+	struct brcmnand_soc *soc = &priv->soc;
+
+	priv->base = dev_remap_addr_name(dev, "nand-int-base");
+	if (!priv->base)
+		return -EINVAL;
+
+	soc->ctlrdy_ack = bcm6368_nand_intc_ack;
+	soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;
+
+	/* Disable and ack all interrupts  */
+	brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
+	brcmnand_writel(BCM6368_NAND_STATUS_MASK,
+			priv->base + BCM6368_NAND_INT);
+
+	return brcmnand_probe(dev, soc);
+}
+
+static const struct udevice_id bcm6368_nand_dt_ids[] = {
+	{
+		.compatible = "brcm,nand-bcm6368",
+	},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6368_nand) = {
+	.name = "bcm6368-nand",
+	.id = UCLASS_MTD,
+	.of_match = bcm6368_nand_dt_ids,
+	.probe = bcm6368_nand_probe,
+	.priv_auto_alloc_size = sizeof(struct bcm6368_nand_soc),
+};
+
+void board_nand_init(void)
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_MTD,
+					  DM_GET_DRIVER(bcm6368_nand), &dev);
+	if (ret && ret != -ENODEV)
+		pr_err("Failed to initialize %s. (error %d)\n", dev->name,
+		       ret);
+}