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Message-ID: <565610B9.5040407@simon.arlott.org.uk>
Date: Wed, 25 Nov 2015 19:49:13 +0000
From: Simon Arlott <simon@...e.lp0.eu>
To: Jonas Gorski <jogo@...nwrt.org>
Cc: Florian Fainelli <f.fainelli@...il.com>,
Rob Herring <robh@...nel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Brian Norris <computersforpeace@...il.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
David Woodhouse <dwmw2@...radead.org>,
MTD Maling List <linux-mtd@...ts.infradead.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>
Subject: [PATCH (v7) 2/2] mtd: brcmnand: Add support for the BCM63268
The BCM63268 has a NAND interrupt register with combined status and enable
registers. It also has a clock for the NAND controller that needs to be
enabled.
Set up the device by enabling the clock, disabling and acking all
interrupts, then handle the CTRL_READY interrupt.
Add a brcmnand_get_socdata() function so that bcm63268_nand can obtain its
data and disable the clock when the device is removed.
Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
---
Added EXPORT_SYMBOL_GPL(brcmnand_get_socdata)
(As the brcmnand module must be loaded first its compatible string will
apply to any existing devices before the soc-specific module can be
loaded.)
drivers/mtd/nand/brcmnand/Makefile | 1 +
drivers/mtd/nand/brcmnand/bcm63268_nand.c | 179 ++++++++++++++++++++++++++++++
drivers/mtd/nand/brcmnand/brcmnand.c | 8 ++
drivers/mtd/nand/brcmnand/brcmnand.h | 1 +
4 files changed, 189 insertions(+)
create mode 100644 drivers/mtd/nand/brcmnand/bcm63268_nand.c
diff --git a/drivers/mtd/nand/brcmnand/Makefile b/drivers/mtd/nand/brcmnand/Makefile
index 3b1fbfd..b83a9ae 100644
--- a/drivers/mtd/nand/brcmnand/Makefile
+++ b/drivers/mtd/nand/brcmnand/Makefile
@@ -2,5 +2,6 @@
# more specific iproc_nand.o, for instance
obj-$(CONFIG_MTD_NAND_BRCMNAND) += iproc_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += bcm63138_nand.o
+obj-$(CONFIG_MTD_NAND_BRCMNAND) += bcm63268_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmstb_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand.o
diff --git a/drivers/mtd/nand/brcmnand/bcm63268_nand.c b/drivers/mtd/nand/brcmnand/bcm63268_nand.c
new file mode 100644
index 0000000..70ad907
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/bcm63268_nand.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright 2015 Simon Arlott
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Derived from bcm63138_nand.c:
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/include/bcm963xx/63268_map_part.h:
+ * Copyright 2000-2010 Broadcom Corporation
+ *
+ * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/flash/nandflash.c:
+ * Copyright 2000-2010 Broadcom Corporation
+ */
+
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "brcmnand.h"
+
+struct bcm63268_nand_soc {
+ struct brcmnand_soc soc;
+ void __iomem *base;
+ struct clk *clk;
+};
+
+#define BCM63268_NAND_INT 0x00
+#define BCM63268_NAND_STATUS_SHIFT 0
+#define BCM63268_NAND_STATUS_MASK (0xfff << BCM63268_NAND_STATUS_SHIFT)
+#define BCM63268_NAND_ENABLE_SHIFT 16
+#define BCM63268_NAND_ENABLE_MASK (0xffff << BCM63268_NAND_ENABLE_SHIFT)
+#define BCM63268_NAND_BASE_ADDR0 0x04
+#define BCM63268_NAND_BASE_ADDR1 0x0c
+
+enum {
+ BCM63268_NP_READ = BIT(0),
+ BCM63268_BLOCK_ERASE = BIT(1),
+ BCM63268_COPY_BACK = BIT(2),
+ BCM63268_PAGE_PGM = BIT(3),
+ BCM63268_CTRL_READY = BIT(4),
+ BCM63268_DEV_RBPIN = BIT(5),
+ BCM63268_ECC_ERR_UNC = BIT(6),
+ BCM63268_ECC_ERR_CORR = BIT(7),
+};
+
+static bool bcm63268_nand_intc_ack(struct brcmnand_soc *soc)
+{
+ struct bcm63268_nand_soc *priv =
+ container_of(soc, struct bcm63268_nand_soc, soc);
+ void __iomem *mmio = priv->base + BCM63268_NAND_INT;
+ u32 val = brcmnand_readl(mmio);
+
+ if (val & (BCM63268_CTRL_READY << BCM63268_NAND_STATUS_SHIFT)) {
+ /* Ack interrupt */
+ val &= ~BCM63268_NAND_STATUS_MASK;
+ val |= BCM63268_CTRL_READY << BCM63268_NAND_STATUS_SHIFT;
+ brcmnand_writel(val, mmio);
+ return true;
+ }
+
+ return false;
+}
+
+static void bcm63268_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+ struct bcm63268_nand_soc *priv =
+ container_of(soc, struct bcm63268_nand_soc, soc);
+ void __iomem *mmio = priv->base + BCM63268_NAND_INT;
+ u32 val = brcmnand_readl(mmio);
+
+ /* Don't ack any interrupts */
+ val &= ~BCM63268_NAND_STATUS_MASK;
+
+ if (en)
+ val |= BCM63268_CTRL_READY << BCM63268_NAND_ENABLE_SHIFT;
+ else
+ val &= ~(BCM63268_CTRL_READY << BCM63268_NAND_ENABLE_SHIFT);
+
+ brcmnand_writel(val, mmio);
+}
+
+static int bcm63268_nand_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm63268_nand_soc *priv;
+ struct brcmnand_soc *soc;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ soc = &priv->soc;
+
+ res = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "nand-intr-base");
+ if (!res)
+ return -EINVAL;
+
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ priv->clk = devm_clk_get(&pdev->dev, "nand");
+ if (IS_ERR(priv->clk))
+ return PTR_ERR(priv->clk);
+
+ ret = clk_prepare_enable(priv->clk);
+ if (ret)
+ return ret;
+
+ soc->ctlrdy_ack = bcm63268_nand_intc_ack;
+ soc->ctlrdy_set_enabled = bcm63268_nand_intc_set;
+
+ /* Disable and ack all interrupts */
+ brcmnand_writel(0, priv->base + BCM63268_NAND_INT);
+ brcmnand_writel(BCM63268_NAND_STATUS_MASK,
+ priv->base + BCM63268_NAND_INT);
+
+ ret = brcmnand_probe(pdev, soc);
+ if (ret)
+ clk_disable_unprepare(priv->clk);
+
+ return ret;
+}
+
+static int bcm63268_nand_remove(struct platform_device *pdev)
+{
+ struct brcmnand_soc *soc = brcmnand_get_socdata(pdev);
+ struct bcm63268_nand_soc *priv = NULL;
+ int ret;
+
+ if (soc)
+ priv = container_of(soc, struct bcm63268_nand_soc, soc);
+
+ ret = brcmnand_remove(pdev);
+ if (ret)
+ return ret;
+
+ if (priv)
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+}
+
+static const struct of_device_id bcm63268_nand_of_match[] = {
+ { .compatible = "brcm,nand-bcm63268" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm63268_nand_of_match);
+
+static struct platform_driver bcm63268_nand_driver = {
+ .probe = bcm63268_nand_probe,
+ .remove = bcm63268_nand_remove,
+ .driver = {
+ .name = "bcm63268_nand",
+ .pm = &brcmnand_pm_ops,
+ .of_match_table = bcm63268_nand_of_match,
+ }
+};
+module_platform_driver(bcm63268_nand_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Simon Arlott");
+MODULE_DESCRIPTION("NAND driver for BCM63268");
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index 2c8f67f..5f26b8a 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -2262,6 +2262,14 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
}
EXPORT_SYMBOL_GPL(brcmnand_probe);
+struct brcmnand_soc *brcmnand_get_socdata(struct platform_device *pdev)
+{
+ struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
+
+ return ctrl ? ctrl->soc : NULL;
+}
+EXPORT_SYMBOL_GPL(brcmnand_get_socdata);
+
int brcmnand_remove(struct platform_device *pdev)
{
struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h
index ef5eabb..6680419 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.h
+++ b/drivers/mtd/nand/brcmnand/brcmnand.h
@@ -65,6 +65,7 @@ static inline void brcmnand_writel(u32 val, void __iomem *addr)
int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc);
int brcmnand_remove(struct platform_device *pdev);
+struct brcmnand_soc *brcmnand_get_socdata(struct platform_device *pdev);
extern const struct dev_pm_ops brcmnand_pm_ops;
--
2.1.4
--
Simon Arlott
--
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