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/*
* 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 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));
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->priv = 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->priv;
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->priv;
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 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,
.opendir = omap4_usbbootfs_opendir,
.stat = omap4_usbbootfs_stat,
.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);
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