drivers: nand: brcmnand: add initial support
The driver brcmnand come from linux kernel 4.18.
Only SoC bcm6838 and bcm6858 are supported.
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c b/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c
new file mode 100644
index 0000000..ece9444
--- /dev/null
+++ b/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c
@@ -0,0 +1,122 @@
+// 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 bcm6838_nand_soc {
+ struct brcmnand_soc soc;
+ void __iomem *base;
+};
+
+#define BCM6838_NAND_INT 0x00
+#define BCM6838_NAND_STATUS_SHIFT 0
+#define BCM6838_NAND_STATUS_MASK (0xfff << BCM6838_NAND_STATUS_SHIFT)
+#define BCM6838_NAND_ENABLE_SHIFT 16
+#define BCM6838_NAND_ENABLE_MASK (0xffff << BCM6838_NAND_ENABLE_SHIFT)
+
+enum {
+ BCM6838_NP_READ = BIT(0),
+ BCM6838_BLOCK_ERASE = BIT(1),
+ BCM6838_COPY_BACK = BIT(2),
+ BCM6838_PAGE_PGM = BIT(3),
+ BCM6838_CTRL_READY = BIT(4),
+ BCM6838_DEV_RBPIN = BIT(5),
+ BCM6838_ECC_ERR_UNC = BIT(6),
+ BCM6838_ECC_ERR_CORR = BIT(7),
+};
+
+static bool bcm6838_nand_intc_ack(struct brcmnand_soc *soc)
+{
+ struct bcm6838_nand_soc *priv =
+ container_of(soc, struct bcm6838_nand_soc, soc);
+ void __iomem *mmio = priv->base + BCM6838_NAND_INT;
+ u32 val = brcmnand_readl(mmio);
+
+ if (val & (BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT)) {
+ /* Ack interrupt */
+ val &= ~BCM6838_NAND_STATUS_MASK;
+ val |= BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT;
+ brcmnand_writel(val, mmio);
+ return true;
+ }
+
+ return false;
+}
+
+static void bcm6838_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+ struct bcm6838_nand_soc *priv =
+ container_of(soc, struct bcm6838_nand_soc, soc);
+ void __iomem *mmio = priv->base + BCM6838_NAND_INT;
+ u32 val = brcmnand_readl(mmio);
+
+ /* Don't ack any interrupts */
+ val &= ~BCM6838_NAND_STATUS_MASK;
+
+ if (en)
+ val |= BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT;
+ else
+ val &= ~(BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT);
+
+ brcmnand_writel(val, mmio);
+}
+
+static int bcm6838_nand_probe(struct udevice *dev)
+{
+ struct udevice *pdev = dev;
+ struct bcm6838_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 = ioremap(res.start, resource_size(&res));
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ soc->ctlrdy_ack = bcm6838_nand_intc_ack;
+ soc->ctlrdy_set_enabled = bcm6838_nand_intc_set;
+
+ /* Disable and ack all interrupts */
+ brcmnand_writel(0, priv->base + BCM6838_NAND_INT);
+ brcmnand_writel(BCM6838_NAND_STATUS_MASK,
+ priv->base + BCM6838_NAND_INT);
+
+ return brcmnand_probe(pdev, soc);
+}
+
+static const struct udevice_id bcm6838_nand_dt_ids[] = {
+ {
+ .compatible = "brcm,nand-bcm6838",
+ },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6838_nand) = {
+ .name = "bcm6838-nand",
+ .id = UCLASS_MTD,
+ .of_match = bcm6838_nand_dt_ids,
+ .probe = bcm6838_nand_probe,
+ .priv_auto_alloc_size = sizeof(struct bcm6838_nand_soc),
+};
+
+void board_nand_init(void)
+{
+ struct udevice *dev;
+ int ret;
+
+ ret = uclass_get_device_by_driver(UCLASS_MTD,
+ DM_GET_DRIVER(bcm6838_nand), &dev);
+ if (ret && ret != -ENODEV)
+ pr_err("Failed to initialize %s. (error %d)\n", dev->name,
+ ret);
+}