[1/4] mtd: prepare place for BCMA NAND flash driver(s)

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 8ca4176..7460ac2 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -489,6 +489,14 @@  config MTD_NAND_GPMI_NAND
 	 block, such as SD card. So pay attention to it when you enable
 	 the GPMI.
 
+config MTD_NAND_BCM47XXNFLASH
+	tristate "Support for NAND flash on BCMA bus"
+	depends on BCMA_NFLASH && BROKEN
+	help
+	  BCMA bus can have various flash memories attached, they are
+	  registered by bcma as platform devices. This enables driver for
+	  NAND flash memories.
+
 config MTD_NAND_PLATFORM
 	tristate "Support for generic platform NAND driver"
 	depends on HAS_IOMEM
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index d4b4d87..8aa55d8 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -51,5 +51,6 @@  obj-$(CONFIG_MTD_NAND_MPC5121_NFC)	+= mpc5121_nfc.o
 obj-$(CONFIG_MTD_NAND_RICOH)		+= r852.o
 obj-$(CONFIG_MTD_NAND_JZ4740)		+= jz4740_nand.o
 obj-$(CONFIG_MTD_NAND_GPMI_NAND)	+= gpmi-nand/
+obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+= bcm47xxnflash/
 
 nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/bcm47xxnflash/Makefile b/drivers/mtd/nand/bcm47xxnflash/Makefile
new file mode 100644
index 0000000..1d0693a
--- /dev/null
+++ b/drivers/mtd/nand/bcm47xxnflash/Makefile
@@ -0,0 +1,3 @@ 
+bcm47xxnflash-y				+= main.o
+
+obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+= bcm47xxnflash.o
diff --git a/drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h b/drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h
new file mode 100644
index 0000000..2e8864a
--- /dev/null
+++ b/drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h
@@ -0,0 +1,14 @@ 
+#ifndef __BCM47XXNFLASH_H
+#define __BCM47XXNFLASH_H
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+
+struct bcm47xxnflash {
+	struct bcma_drv_cc *cc;
+
+	struct nand_chip nand_chip;
+	struct mtd_info mtd;
+};
+
+#endif /* BCM47XXNFLASH */
diff --git a/drivers/mtd/nand/bcm47xxnflash/main.c b/drivers/mtd/nand/bcm47xxnflash/main.c
new file mode 100644
index 0000000..fc9139d
--- /dev/null
+++ b/drivers/mtd/nand/bcm47xxnflash/main.c
@@ -0,0 +1,108 @@ 
+/*
+ * BCM47XX NAND flash driver
+ *
+ * Copyright (C) 2012 Rafał Miłecki <zajec5@gmail.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/bcma/bcma.h>
+
+#include "bcm47xxnflash.h"
+
+MODULE_DESCRIPTION("NAND flash driver for BCMA bus");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rafał Miłecki");
+
+static const char *probes[] = { "bcm47xxpart", NULL };
+
+static int bcm47xxnflash_probe(struct platform_device *pdev)
+{
+	struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
+	struct bcm47xxnflash *b47n;
+	int err = 0;
+
+	b47n = kzalloc(sizeof(*b47n), GFP_KERNEL);
+	if (!b47n) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	b47n->nand_chip.priv = b47n;
+	b47n->mtd.owner = THIS_MODULE;
+	b47n->mtd.priv = &b47n->nand_chip; /* Required */
+	b47n->cc = container_of(nflash, struct bcma_drv_cc, nflash);
+
+	if (0) {
+		/* TODO: init device */
+	} else {
+		pr_err("Device not supported\n");
+		err = -ENOTSUPP;
+	}
+	if (err) {
+		pr_err("Initialization failed: %d\n", err);
+		goto err_init;
+	}
+
+	err = mtd_device_parse_register(&b47n->mtd, probes, NULL, NULL, 0);
+	if (err) {
+		pr_err("Failed to register MTD device: %d\n", err);
+		goto err_dev_reg;
+	}
+
+	return 0;
+
+err_dev_reg:
+err_init:
+	kfree(b47n);
+out:
+	return err;
+}
+
+static int __devexit bcm47xxnflash_remove(struct platform_device *pdev)
+{
+	struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
+
+	if (nflash->mtd)
+		mtd_device_unregister(nflash->mtd);
+
+	return 0;
+}
+
+static struct platform_driver bcm47xxnflash_driver = {
+	.remove = __devexit_p(bcm47xxnflash_remove),
+	.driver = {
+		.name = "bcma_nflash",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init bcm47xxnflash_init(void)
+{
+	int err;
+
+	/*
+	 * Platform device "bcma_nflash" exists on SoCs and is registered very
+	 * early, it won't be added during runtime (use platform_driver_probe).
+	 */
+	err = platform_driver_probe(&bcm47xxnflash_driver, bcm47xxnflash_probe);
+	if (err)
+		pr_err("Failed to register serial flash driver: %d\n", err);
+
+	return err;
+}
+
+static void __exit bcm47xxnflash_exit(void)
+{
+	platform_driver_unregister(&bcm47xxnflash_driver);
+}
+
+module_init(bcm47xxnflash_init);
+module_exit(bcm47xxnflash_exit);