[PATCH 2/6] mtd: prepare place for BCMA NAND flash driver(s)
Rafał Miłecki
zajec5 at gmail.com
Thu Sep 27 07:55:43 EDT 2012
BCMA bus can contain NAND flash memory, it's registered in system as
platform device. This adds required hooks and place for controler
specific drivers.
Signed-off-by: Rafał Miłecki <zajec5 at gmail.com>
---
0002-mtd-prepare-place-for-BCMA-NAND-flash-driver-s.patch
Successfully built configuration "mips-bcm47xx_defconfig,mips,mips-linux-", no issues
WARNING:CONFIG_DESCRIPTION: please write a paragraph that describes the config symbol fully
#33: FILE: drivers/mtd/nand/Kconfig:492:
+config MTD_NAND_BCM47XXNFLASH
WARNING:STATIC_CONST_CHAR_ARRAY: static const char * array should probably be static const char * const
#113: FILE: drivers/mtd/nand/bcm47xxnflash/main.c:24:
+static const char *probes[] = { "bcm47xxpart", NULL };
I believe that Kconfig description is OK, and I don't anything wrong
with my probes. Other drivers define probes in the same way.
---
drivers/mtd/nand/Kconfig | 8 ++
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/bcm47xxnflash/Makefile | 3 +
drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h | 14 +++
drivers/mtd/nand/bcm47xxnflash/main.c | 108 ++++++++++++++++++++++++
5 files changed, 134 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/bcm47xxnflash/Makefile
create mode 100644 drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h
create mode 100644 drivers/mtd/nand/bcm47xxnflash/main.c
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 4883139..6ba1988 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -446,6 +446,14 @@ 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 "R/O support for NAND flash on BCMA bus"
+ depends on BCMA_NFLASH
+ help
+ BCMA bus can have various flash memories attached, they are
+ registered by bcma as platform devices. This enables driver for
+ NAND flash memories. For now only read mode is implemented.
+
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 2cbd091..01f39f87c 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -53,5 +53,6 @@ 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_XWAY) += xway_nand.o
+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 at 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);
--
1.7.7
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