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authorRafał Miłecki <zajec5@gmail.com>2012-09-17 11:50:49 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-09-29 15:39:12 +0100
commit5fe42d5bf2deac62bf2a532b30deacc007805b91 (patch)
tree132adb87be3fb0437fbca0a4a4afa32888f77ac7 /drivers/mtd/devices
parent6997af7cee305bb9fc77260e84de94bfd486f7af (diff)
downloadlinaro-lsk-5fe42d5bf2deac62bf2a532b30deacc007805b91.tar.gz
mtd: basic (read only) driver for BCMA serial flash
This registers MTD driver for serial flash platform device. Right now it supports reading only, writing still has to be implemented. Artem: minor amendments. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/devices')
-rw-r--r--drivers/mtd/devices/Kconfig8
-rw-r--r--drivers/mtd/devices/Makefile1
-rw-r--r--drivers/mtd/devices/bcm47xxsflash.c105
3 files changed, 114 insertions, 0 deletions
diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index 6cc5a1ac380..27f80cd8aef 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -120,6 +120,14 @@ config MTD_SST25L
Set up your spi devices with the right board-specific platform data,
if you want to specify device partitioning.
+config MTD_BCM47XXSFLASH
+ tristate "R/O support for serial flash on BCMA bus"
+ depends on BCMA_SFLASH
+ help
+ BCMA bus can have various flash memories attached, they are
+ registered by bcma as platform devices. This enables driver for
+ serial flash memories (only read-only mode is implemented).
+
config MTD_SLRAM
tristate "Uncached system RAM"
help
diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile
index a4dd1d822b6..395733a30ef 100644
--- a/drivers/mtd/devices/Makefile
+++ b/drivers/mtd/devices/Makefile
@@ -19,5 +19,6 @@ obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataflash.o
obj-$(CONFIG_MTD_M25P80) += m25p80.o
obj-$(CONFIG_MTD_SPEAR_SMI) += spear_smi.o
obj-$(CONFIG_MTD_SST25L) += sst25l.o
+obj-$(CONFIG_MTD_BCM47XXSFLASH) += bcm47xxsflash.o
CFLAGS_docg3.o += -I$(src) \ No newline at end of file
diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c
new file mode 100644
index 00000000000..2dc5a6f3fd5
--- /dev/null
+++ b/drivers/mtd/devices/bcm47xxsflash.c
@@ -0,0 +1,105 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/platform_device.h>
+#include <linux/bcma/bcma.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
+
+static const char *probes[] = { "bcm47xxpart", NULL };
+
+static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct bcma_sflash *sflash = mtd->priv;
+
+ /* Check address range */
+ if ((from + len) > mtd->size)
+ return -EINVAL;
+
+ memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from),
+ len);
+
+ return len;
+}
+
+static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash,
+ struct mtd_info *mtd)
+{
+ mtd->priv = sflash;
+ mtd->name = "bcm47xxsflash";
+ mtd->owner = THIS_MODULE;
+ mtd->type = MTD_ROM;
+ mtd->size = sflash->size;
+ mtd->_read = bcm47xxsflash_read;
+
+ /* TODO: implement writing support and verify/change following code */
+ mtd->flags = MTD_CAP_ROM;
+ mtd->writebufsize = mtd->writesize = 1;
+}
+
+static int bcm47xxsflash_probe(struct platform_device *pdev)
+{
+ struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
+ int err;
+
+ sflash->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ if (!sflash->mtd) {
+ err = -ENOMEM;
+ goto out;
+ }
+ bcm47xxsflash_fill_mtd(sflash, sflash->mtd);
+
+ err = mtd_device_parse_register(sflash->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:
+ kfree(sflash->mtd);
+out:
+ return err;
+}
+
+static int __devexit bcm47xxsflash_remove(struct platform_device *pdev)
+{
+ struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
+
+ mtd_device_unregister(sflash->mtd);
+ kfree(sflash->mtd);
+
+ return 0;
+}
+
+static struct platform_driver bcma_sflash_driver = {
+ .remove = __devexit_p(bcm47xxsflash_remove),
+ .driver = {
+ .name = "bcma_sflash",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init bcm47xxsflash_init(void)
+{
+ int err;
+
+ err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe);
+ if (err)
+ pr_err("Failed to register BCMA serial flash driver: %d\n",
+ err);
+
+ return err;
+}
+
+static void __exit bcm47xxsflash_exit(void)
+{
+ platform_driver_unregister(&bcma_sflash_driver);
+}
+
+module_init(bcm47xxsflash_init);
+module_exit(bcm47xxsflash_exit);