[PATCH v4 1/5] nand: brcmnand: add iproc support
Linus Walleij
linus.walleij at linaro.org
Fri Apr 7 15:40:04 CEST 2023
Add support for the iproc Broadcom NAND controller,
used in Northstar SoCs for example. Based on the Linux
driver.
Cc: Philippe Reynes <philippe.reynes at softathome.com>
Cc: Dario Binacchi <dario.binacchi at amarulasolutions.com>
Acked-by: William Zhang <william.zhang at broadcom.com>
Reviewed-by: Michael Trimarchi <michael at amarulasolutions.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
ChangeLog v3->v4:
- No changes
ChangeLog v2->v3:
- Collect William Zhang's ACK
- Bundle with NorthStar enablement patches.
ChangeLog v1->v2:
- Check return value of dev_read_resource()
- Use devm_ioremap()
- Collect Michael's Review tag
---
drivers/mtd/nand/raw/Kconfig | 7 +
drivers/mtd/nand/raw/brcmnand/Makefile | 1 +
drivers/mtd/nand/raw/brcmnand/iproc_nand.c | 148 +++++++++++++++++++++
3 files changed, 156 insertions(+)
create mode 100644 drivers/mtd/nand/raw/brcmnand/iproc_nand.c
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 5c7b0d9dcc1f..d115fcf841ff 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -156,6 +156,13 @@ config NAND_BRCMNAND_63158
help
Enable support for broadcom nand driver on bcm63158.
+config NAND_BRCMNAND_IPROC
+ bool "Support Broadcom NAND controller on the iproc family"
+ depends on NAND_BRCMNAND
+ help
+ Enable support for broadcom nand driver on the Broadcom
+ iproc family such as Northstar (BCM5301x, BCM4708...)
+
config NAND_DAVINCI
bool "Support TI Davinci NAND controller"
select SYS_NAND_SELF_INIT if TARGET_DA850EVM
diff --git a/drivers/mtd/nand/raw/brcmnand/Makefile b/drivers/mtd/nand/raw/brcmnand/Makefile
index f46a7edae321..0c6325aaa618 100644
--- a/drivers/mtd/nand/raw/brcmnand/Makefile
+++ b/drivers/mtd/nand/raw/brcmnand/Makefile
@@ -6,5 +6,6 @@ obj-$(CONFIG_NAND_BRCMNAND_6753) += bcm6753_nand.o
obj-$(CONFIG_NAND_BRCMNAND_68360) += bcm68360_nand.o
obj-$(CONFIG_NAND_BRCMNAND_6838) += bcm6838_nand.o
obj-$(CONFIG_NAND_BRCMNAND_6858) += bcm6858_nand.o
+obj-$(CONFIG_NAND_BRCMNAND_IPROC) += iproc_nand.o
obj-$(CONFIG_NAND_BRCMNAND) += brcmnand.o
obj-$(CONFIG_NAND_BRCMNAND) += brcmnand_compat.o
diff --git a/drivers/mtd/nand/raw/brcmnand/iproc_nand.c b/drivers/mtd/nand/raw/brcmnand/iproc_nand.c
new file mode 100644
index 000000000000..69711d98ce1b
--- /dev/null
+++ b/drivers/mtd/nand/raw/brcmnand/iproc_nand.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Code borrowed from the Linux driver
+ * Copyright (C) 2015 Broadcom Corporation
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <memalign.h>
+#include <nand.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <dm.h>
+
+#include "brcmnand.h"
+
+struct iproc_nand_soc {
+ struct brcmnand_soc soc;
+ void __iomem *idm_base;
+ void __iomem *ext_base;
+};
+
+#define IPROC_NAND_CTLR_READY_OFFSET 0x10
+#define IPROC_NAND_CTLR_READY BIT(0)
+
+#define IPROC_NAND_IO_CTRL_OFFSET 0x00
+#define IPROC_NAND_APB_LE_MODE BIT(24)
+#define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6)
+
+static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
+{
+ struct iproc_nand_soc *priv =
+ container_of(soc, struct iproc_nand_soc, soc);
+ void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
+ u32 val = brcmnand_readl(mmio);
+
+ if (val & IPROC_NAND_CTLR_READY) {
+ brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
+ return true;
+ }
+
+ return false;
+}
+
+static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+ struct iproc_nand_soc *priv =
+ container_of(soc, struct iproc_nand_soc, soc);
+ void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
+ u32 val = brcmnand_readl(mmio);
+
+ if (en)
+ val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
+ else
+ val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
+
+ brcmnand_writel(val, mmio);
+}
+
+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);
+ void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
+ u32 val;
+
+ val = brcmnand_readl(mmio);
+
+ /*
+ * In the case of BE or when dealing with NAND data, always 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_SYS_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);
+}
+
+static int iproc_nand_probe(struct udevice *dev)
+{
+ struct udevice *pdev = dev;
+ struct iproc_nand_soc *priv = dev_get_priv(dev);
+ struct brcmnand_soc *soc;
+ struct resource res;
+ int ret;
+
+ soc = &priv->soc;
+
+ ret = dev_read_resource_byname(pdev, "iproc-idm", &res);
+ if (ret)
+ return ret;
+
+ priv->idm_base = devm_ioremap(dev, res.start, resource_size(&res));
+ if (IS_ERR(priv->idm_base))
+ return PTR_ERR(priv->idm_base);
+
+ ret = dev_read_resource_byname(pdev, "iproc-ext", &res);
+ if (ret)
+ return ret;
+
+ priv->ext_base = devm_ioremap(dev, res.start, resource_size(&res));
+ if (IS_ERR(priv->ext_base))
+ return PTR_ERR(priv->ext_base);
+
+ soc->ctlrdy_ack = iproc_nand_intc_ack;
+ soc->ctlrdy_set_enabled = iproc_nand_intc_set;
+ soc->prepare_data_bus = iproc_nand_apb_access;
+
+ return brcmnand_probe(pdev, soc);
+}
+
+static const struct udevice_id iproc_nand_dt_ids[] = {
+ {
+ .compatible = "brcm,nand-iproc",
+ },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(iproc_nand) = {
+ .name = "iproc-nand",
+ .id = UCLASS_MTD,
+ .of_match = iproc_nand_dt_ids,
+ .probe = iproc_nand_probe,
+ .priv_auto = sizeof(struct iproc_nand_soc),
+};
+
+void board_nand_init(void)
+{
+ struct udevice *dev;
+ int ret;
+
+ ret = uclass_get_device_by_driver(UCLASS_MTD,
+ DM_DRIVER_GET(iproc_nand), &dev);
+ if (ret && ret != -ENODEV)
+ pr_err("Failed to initialize %s. (error %d)\n", dev->name,
+ ret);
+}
--
2.39.2
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