[PATCH 12/14] omap4: add filesystem support over usb boot
Vicente
vicencb at gmail.com
Mon Oct 8 18:55:22 EDT 2012
Signed-off-by: Vicente <vicencb at gmail.com>
---
fs/Kconfig | 5 ++
fs/Makefile | 1 +
fs/omap4_usbbootfs.c | 219 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 225 insertions(+)
create mode 100644 fs/omap4_usbbootfs.c
diff --git a/fs/Kconfig b/fs/Kconfig
index 4c66543..0ab69d7 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -29,6 +29,11 @@ config FS_TFTP
prompt "tftp support"
depends on NET
+config FS_OMAP4_USBBOOT
+ bool
+ prompt "Filesystem over usb boot"
+ depends on OMAP4_USBBOOT
+
config FS_NFS
depends on NET
bool
diff --git a/fs/Makefile b/fs/Makefile
index 1b52bee..ad745d9 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_FS_DEVFS) += devfs.o
obj-$(CONFIG_FS_FAT) += fat/
obj-y += fs.o
obj-$(CONFIG_FS_TFTP) += tftp.o
+obj-$(CONFIG_FS_OMAP4_USBBOOT) += omap4_usbbootfs.o
obj-$(CONFIG_FS_NFS) += nfs.o
diff --git a/fs/omap4_usbbootfs.c b/fs/omap4_usbbootfs.c
new file mode 100644
index 0000000..0dc7682
--- /dev/null
+++ b/fs/omap4_usbbootfs.c
@@ -0,0 +1,219 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <fs.h>
+#include <fcntl.h>
+#include <init.h>
+#include <linux/stat.h>
+#include <linux/err.h>
+#include <mach/omap4_rom_usb.h>
+
+#define OMAP4_USBBOOT_FS_MAGIC 0x5562464D
+#define OMAP4_USBBOOT_FS_CMD_OPEN 0x46530000
+#define OMAP4_USBBOOT_FS_CMD_CLOSE 0x46530001
+#define OMAP4_USBBOOT_FS_CMD_READ 0x46530002
+#define OMAP4_USBBOOT_FS_CMD_END 0x4653FFFF
+
+struct file_priv {
+ s32 id;
+ u32 size;
+};
+/*
+static int omap4_usbbootfs_create(
+ struct device_d *dev, const char *pathname, mode_t mode)
+{
+ return -ENOSYS;
+}
+
+static int omap4_usbbootfs_unlink(struct device_d *dev, const char *pathname)
+{
+ return -ENOSYS;
+}
+
+static int omap4_usbbootfs_mkdir(struct device_d *dev, const char *pathname)
+{
+ return -ENOSYS;
+}
+
+static int omap4_usbbootfs_rmdir(struct device_d *dev, const char *pathname)
+{
+ return -ENOSYS;
+}
+
+static int omap4_usbbootfs_write(
+ struct device_d *_dev, FILE *f, const void *inbuf, size_t size)
+{
+ return -ENOSYS;
+}
+
+static int omap4_usbbootfs_truncate(struct device_d *dev, FILE *f, ulong size)
+{
+ return -ENOSYS;
+}
+*/
+
+static struct file_priv *omap4_usbbootfs_do_open(
+ struct device_d *dev, int accmode, const char *filename)
+{
+ struct file_priv *priv;
+ u32 data;
+
+ if (accmode & O_ACCMODE)
+ return ERR_PTR(-ENOSYS);
+
+ priv = xzalloc(sizeof(*priv));
+ if (!priv)
+ return ERR_PTR(-ENOMEM);
+
+ data = OMAP4_USBBOOT_FS_MAGIC ; omap4_usbboot_write(&data, 4);
+ data = OMAP4_USBBOOT_FS_CMD_OPEN; omap4_usbboot_write(&data, 4);
+ omap4_usbboot_puts(filename);
+ data = OMAP4_USBBOOT_FS_CMD_END ; omap4_usbboot_write(&data, 4);
+
+ if (omap4_usbboot_read(&priv->id, 4) ||
+ omap4_usbboot_read(&priv->size, 4)
+ ) {
+ free(priv);
+ return ERR_PTR(-EIO);
+ }
+ if (priv->id < 0) {
+ free(priv);
+ return ERR_PTR(-ENOENT);
+ }
+
+ return priv;
+}
+
+static int omap4_usbbootfs_open(
+ struct device_d *dev, FILE *file, const char *filename)
+{
+ struct file_priv *priv;
+
+ priv = omap4_usbbootfs_do_open(dev, file->flags, filename);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ file->inode = priv;
+ file->size = priv->size;
+
+ return 0;
+}
+
+static int omap4_usbbootfs_do_close(struct file_priv *priv)
+{
+ u32 data;
+ data = OMAP4_USBBOOT_FS_MAGIC ; omap4_usbboot_write(&data, 4);
+ data = OMAP4_USBBOOT_FS_CMD_CLOSE; omap4_usbboot_write(&data, 4);
+ omap4_usbboot_write(&priv->id, 4);
+ data = OMAP4_USBBOOT_FS_CMD_END ; omap4_usbboot_write(&data, 4);
+ free(priv);
+ return 0;
+}
+
+static int omap4_usbbootfs_close(struct device_d *dev, FILE *f)
+{
+ struct file_priv *priv = f->inode;
+ return omap4_usbbootfs_do_close(priv);
+}
+
+static int omap4_usbbootfs_read(
+ struct device_d *dev, FILE *f, void *buf, size_t size)
+{
+ struct file_priv *priv = f->inode;
+ u32 data;
+
+ if (size > priv->size - f->pos)
+ size = priv->size - f->pos;
+ if (!size)
+ return 0;
+
+ data = OMAP4_USBBOOT_FS_MAGIC ; omap4_usbboot_write(&data, 4);
+ data = OMAP4_USBBOOT_FS_CMD_READ; omap4_usbboot_write(&data, 4);
+ omap4_usbboot_write(&priv->id, 4);
+ omap4_usbboot_write(&f->pos, 4);
+ omap4_usbboot_write(&size, 4);
+ data = OMAP4_USBBOOT_FS_CMD_END ; omap4_usbboot_write(&data, 4);
+
+ if (omap4_usbboot_read(buf, size))
+ return -EIO;
+
+ return size;
+}
+
+static loff_t omap4_usbbootfs_lseek(struct device_d *dev, FILE *f, loff_t pos)
+{
+ f->pos = pos;
+ return pos;
+}
+
+static DIR *omap4_usbbootfs_opendir(struct device_d *dev, const char *pathname)
+{
+ return NULL;
+}
+
+static int omap4_usbbootfs_stat(
+ struct device_d *dev, const char *filename, struct stat *s)
+{
+ struct file_priv *priv;
+
+ priv = omap4_usbbootfs_do_open(dev, O_RDONLY, filename);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ s->st_mode = S_IFREG |
+ S_IRUSR | S_IRGRP | S_IROTH |
+ S_IXUSR | S_IXGRP | S_IXOTH ;
+ s->st_size = priv->size;
+
+ omap4_usbbootfs_do_close(priv);
+
+ return 0;
+}
+
+static int omap4_usbbootfs_probe(struct device_d *dev)
+{
+ return 0;
+}
+static void omap4_usbbootfs_remove(struct device_d *dev)
+{
+}
+
+static struct fs_driver_d omap4_usbbootfs_driver = {
+ .open = omap4_usbbootfs_open,
+ .close = omap4_usbbootfs_close,
+ .read = omap4_usbbootfs_read,
+ .lseek = omap4_usbbootfs_lseek,
+ .opendir = omap4_usbbootfs_opendir,
+ .stat = omap4_usbbootfs_stat,
+/*
+ .create = omap4_usbbootfs_create,
+ .unlink = omap4_usbbootfs_unlink,
+ .mkdir = omap4_usbbootfs_mkdir,
+ .rmdir = omap4_usbbootfs_rmdir,
+ .write = omap4_usbbootfs_write,
+ .truncate= omap4_usbbootfs_truncate,
+*/
+ .flags = 0,
+ .drv = {
+ .probe = omap4_usbbootfs_probe,
+ .remove = omap4_usbbootfs_remove,
+ .name = "omap4_usbbootfs",
+ }
+};
+
+static int omap4_usbbootfs_init(void)
+{
+ return register_fs_driver(&omap4_usbbootfs_driver);
+}
+coredevice_initcall(omap4_usbbootfs_init);
--
1.7.12.2
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