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authorSimon Arlott <simon@fire.lp0.eu>2015-12-09 20:43:54 +0000
committerBrian Norris <computersforpeace@gmail.com>2015-12-09 18:28:42 -0800
commitaf3855dd191799a797e80dc55ecd5a9a226c3e2c (patch)
tree739088e43b0ebf559d51e6aeceb9fe7233783d80 /drivers/mtd/nand/brcmnand/bcm6368_nand.c
parent5c05bc00721bbe223ce93d8873ac42c8170d809c (diff)
mtd: brcmnand: Add support for the BCM6368
The BCM6368 has a NAND interrupt register with combined status and enable registers. As the BCM6328, BCM6362 and BCM6368 all use v2.1 controllers, the first variant that will work with this driver is the BCM63268 using a v4.0 controller. Set up the device by disabling and acking all interrupts, then handle the CTRL_READY interrupt. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/nand/brcmnand/bcm6368_nand.c')
-rw-r--r--drivers/mtd/nand/brcmnand/bcm6368_nand.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/mtd/nand/brcmnand/bcm6368_nand.c b/drivers/mtd/nand/brcmnand/bcm6368_nand.c
new file mode 100644
index 000000000000..7f5359be24f2
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/bcm6368_nand.c
@@ -0,0 +1,145 @@
+/*
+ * 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/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 bcm6368_nand_soc {
+ struct brcmnand_soc soc;
+ void __iomem *base;
+};
+
+#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)
+#define BCM6368_NAND_BASE_ADDR0 0x04
+#define BCM6368_NAND_BASE_ADDR1 0x0c
+
+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 =
+ container_of(soc, struct bcm6368_nand_soc, 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 =
+ container_of(soc, struct bcm6368_nand_soc, 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 platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm6368_nand_soc *priv;
+ struct brcmnand_soc *soc;
+ struct resource *res;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ soc = &priv->soc;
+
+ res = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "nand-int-base");
+ if (!res)
+ return -EINVAL;
+
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ 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(pdev, soc);
+}
+
+static const struct of_device_id bcm6368_nand_of_match[] = {
+ { .compatible = "brcm,nand-bcm6368" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm6368_nand_of_match);
+
+static struct platform_driver bcm6368_nand_driver = {
+ .probe = bcm6368_nand_probe,
+ .remove = brcmnand_remove,
+ .driver = {
+ .name = "bcm6368_nand",
+ .pm = &brcmnand_pm_ops,
+ .of_match_table = bcm6368_nand_of_match,
+ }
+};
+module_platform_driver(bcm6368_nand_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Simon Arlott");
+MODULE_DESCRIPTION("NAND driver for BCM6368");