ps3: FLASH ROM Storage Driver
Add a FLASH ROM Storage Driver for the PS3:
- Implemented as a misc character device driver
- Uses a fixed 256 KiB buffer allocated from boot memory as the hypervisor
requires the writing of aligned 256 KiB blocks
Cc: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c
new file mode 100644
index 0000000..79b6f46
--- /dev/null
+++ b/drivers/char/ps3flash.c
@@ -0,0 +1,440 @@
+/*
+ * PS3 FLASH ROM Storage Driver
+ *
+ * Copyright (C) 2007 Sony Computer Entertainment Inc.
+ * Copyright 2007 Sony Corp.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+
+#include <asm/lv1call.h>
+#include <asm/ps3stor.h>
+
+
+#define DEVICE_NAME "ps3flash"
+
+#define FLASH_BLOCK_SIZE (256*1024)
+
+
+struct ps3flash_private {
+ struct mutex mutex; /* Bounce buffer mutex */
+};
+
+static struct ps3_storage_device *ps3flash_dev;
+
+static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev,
+ u64 lpar, u64 start_sector,
+ u64 sectors, int write)
+{
+ u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors,
+ write);
+ if (res) {
+ dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
+ __LINE__, write ? "write" : "read", res);
+ return -EIO;
+ }
+ return sectors;
+}
+
+static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev,
+ u64 start_sector, u64 sectors,
+ unsigned int sector_offset)
+{
+ u64 max_sectors, lpar;
+
+ max_sectors = dev->bounce_size / dev->blk_size;
+ if (sectors > max_sectors) {
+ dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %lu\n",
+ __func__, __LINE__, max_sectors);
+ sectors = max_sectors;
+ }
+
+ lpar = dev->bounce_lpar + sector_offset * dev->blk_size;
+ return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors,
+ 0);
+}
+
+static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev,
+ u64 start_sector)
+{
+ u64 sectors = dev->bounce_size / dev->blk_size;
+ return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector,
+ sectors, 1);
+}
+
+static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
+{
+ struct ps3_storage_device *dev = ps3flash_dev;
+ loff_t res;
+
+ mutex_lock(&file->f_mapping->host->i_mutex);
+ switch (origin) {
+ case 1:
+ offset += file->f_pos;
+ break;
+ case 2:
+ offset += dev->regions[dev->region_idx].size*dev->blk_size;
+ break;
+ }
+ if (offset < 0) {
+ res = -EINVAL;
+ goto out;
+ }
+
+ file->f_pos = offset;
+ res = file->f_pos;
+
+out:
+ mutex_unlock(&file->f_mapping->host->i_mutex);
+ return res;
+}
+
+static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
+ loff_t *pos)
+{
+ struct ps3_storage_device *dev = ps3flash_dev;
+ struct ps3flash_private *priv = dev->sbd.core.driver_data;
+ u64 size, start_sector, end_sector, offset;
+ ssize_t sectors_read;
+ size_t remaining, n;
+
+ dev_dbg(&dev->sbd.core,
+ "%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
+ __func__, __LINE__, count, *pos, buf);
+
+ size = dev->regions[dev->region_idx].size*dev->blk_size;
+ if (*pos >= size || !count)
+ return 0;
+
+ if (*pos + count > size) {
+ dev_dbg(&dev->sbd.core,
+ "%s:%u Truncating count from %zu to %llu\n", __func__,
+ __LINE__, count, size - *pos);
+ count = size - *pos;
+ }
+
+ start_sector = *pos / dev->blk_size;
+ offset = *pos % dev->blk_size;
+ end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);
+
+ remaining = count;
+ do {
+ mutex_lock(&priv->mutex);
+
+ sectors_read = ps3flash_read_sectors(dev, start_sector,
+ end_sector-start_sector,
+ 0);
+ if (sectors_read < 0) {
+ mutex_unlock(&priv->mutex);
+ goto fail;
+ }
+
+ n = min(remaining, sectors_read*dev->blk_size-offset);
+ dev_dbg(&dev->sbd.core,
+ "%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
+ __func__, __LINE__, n, dev->bounce_buf+offset, buf);
+ if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
+ mutex_unlock(&priv->mutex);
+ sectors_read = -EFAULT;
+ goto fail;
+ }
+
+ mutex_unlock(&priv->mutex);
+
+ *pos += n;
+ buf += n;
+ remaining -= n;
+ start_sector += sectors_read;
+ offset = 0;
+ } while (remaining > 0);
+
+ return count;
+
+fail:
+ return sectors_read;
+}
+
+static ssize_t ps3flash_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct ps3_storage_device *dev = ps3flash_dev;
+ struct ps3flash_private *priv = dev->sbd.core.driver_data;
+ u64 size, chunk_sectors, start_write_sector, end_write_sector,
+ end_read_sector, start_read_sector, head, tail, offset;
+ ssize_t res;
+ size_t remaining, n;
+ unsigned int sec_off;
+
+ dev_dbg(&dev->sbd.core,
+ "%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
+ __func__, __LINE__, count, *pos, buf);
+
+ size = dev->regions[dev->region_idx].size*dev->blk_size;
+ if (*pos >= size || !count)
+ return 0;
+
+ if (*pos + count > size) {
+ dev_dbg(&dev->sbd.core,
+ "%s:%u Truncating count from %zu to %llu\n", __func__,
+ __LINE__, count, size - *pos);
+ count = size - *pos;
+ }
+
+ chunk_sectors = dev->bounce_size / dev->blk_size;
+
+ start_write_sector = *pos / dev->bounce_size * chunk_sectors;
+ offset = *pos % dev->bounce_size;
+ end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) *
+ chunk_sectors;
+
+ end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
+ start_read_sector = (*pos + count) / dev->blk_size;
+
+ /*
+ * As we have to write in 256 KiB chunks, while we can read in blk_size
+ * (usually 512 bytes) chunks, we perform the following steps:
+ * 1. Read from start_write_sector to end_read_sector ("head")
+ * 2. Read from start_read_sector to end_write_sector ("tail")
+ * 3. Copy data to buffer
+ * 4. Write from start_write_sector to end_write_sector
+ * All of this is complicated by using only one 256 KiB bounce buffer.
+ */
+
+ head = end_read_sector - start_write_sector;
+ tail = end_write_sector - start_read_sector;
+
+ remaining = count;
+ do {
+ mutex_lock(&priv->mutex);
+
+ if (end_read_sector >= start_read_sector) {
+ /* Merge head and tail */
+ dev_dbg(&dev->sbd.core,
+ "Merged head and tail: %lu sectors at %lu\n",
+ chunk_sectors, start_write_sector);
+ res = ps3flash_read_sectors(dev, start_write_sector,
+ chunk_sectors, 0);
+ if (res < 0)
+ goto fail;
+ } else {
+ if (head) {
+ /* Read head */
+ dev_dbg(&dev->sbd.core,
+ "head: %lu sectors at %lu\n", head,
+ start_write_sector);
+ res = ps3flash_read_sectors(dev,
+ start_write_sector,
+ head, 0);
+ if (res < 0)
+ goto fail;
+ }
+ if (start_read_sector <
+ start_write_sector+chunk_sectors) {
+ /* Read tail */
+ dev_dbg(&dev->sbd.core,
+ "tail: %lu sectors at %lu\n", tail,
+ start_read_sector);
+ sec_off = start_read_sector-start_write_sector;
+ res = ps3flash_read_sectors(dev,
+ start_read_sector,
+ tail, sec_off);
+ if (res < 0)
+ goto fail;
+ }
+ }
+
+ n = min(remaining, dev->bounce_size-offset);
+ dev_dbg(&dev->sbd.core,
+ "%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
+ __func__, __LINE__, n, buf, dev->bounce_buf+offset);
+ if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
+ res = -EFAULT;
+ goto fail;
+ }
+
+ res = ps3flash_write_chunk(dev, start_write_sector);
+ if (res < 0)
+ goto fail;
+
+ mutex_unlock(&priv->mutex);
+
+ *pos += n;
+ buf += n;
+ remaining -= n;
+ start_write_sector += chunk_sectors;
+ head = 0;
+ offset = 0;
+ } while (remaining > 0);
+
+ return count;
+
+fail:
+ mutex_unlock(&priv->mutex);
+ return res;
+}
+
+
+static irqreturn_t ps3flash_interrupt(int irq, void *data)
+{
+ struct ps3_storage_device *dev = data;
+ int res;
+ u64 tag, status;
+
+ res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
+
+ if (tag != dev->tag)
+ dev_err(&dev->sbd.core,
+ "%s:%u: tag mismatch, got %lx, expected %lx\n",
+ __func__, __LINE__, tag, dev->tag);
+
+ if (res) {
+ dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
+ __func__, __LINE__, res, status);
+ } else {
+ dev->lv1_status = status;
+ complete(&dev->done);
+ }
+ return IRQ_HANDLED;
+}
+
+
+static const struct file_operations ps3flash_fops = {
+ .owner = THIS_MODULE,
+ .llseek = ps3flash_llseek,
+ .read = ps3flash_read,
+ .write = ps3flash_write,
+};
+
+static struct miscdevice ps3flash_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = DEVICE_NAME,
+ .fops = &ps3flash_fops,
+};
+
+static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
+{
+ struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+ struct ps3flash_private *priv;
+ int error;
+ unsigned long tmp;
+
+ tmp = dev->regions[dev->region_idx].start*dev->blk_size;
+ if (tmp % FLASH_BLOCK_SIZE) {
+ dev_err(&dev->sbd.core,
+ "%s:%u region start %lu is not aligned\n", __func__,
+ __LINE__, tmp);
+ return -EINVAL;
+ }
+ tmp = dev->regions[dev->region_idx].size*dev->blk_size;
+ if (tmp % FLASH_BLOCK_SIZE) {
+ dev_err(&dev->sbd.core,
+ "%s:%u region size %lu is not aligned\n", __func__,
+ __LINE__, tmp);
+ return -EINVAL;
+ }
+
+ /* use static buffer, kmalloc cannot allocate 256 KiB */
+ if (!ps3flash_bounce_buffer.address)
+ return -ENODEV;
+
+ if (ps3flash_dev) {
+ dev_err(&dev->sbd.core,
+ "Only one FLASH device is supported\n");
+ return -EBUSY;
+ }
+
+ ps3flash_dev = dev;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ error = -ENOMEM;
+ goto fail;
+ }
+
+ dev->sbd.core.driver_data = priv;
+ mutex_init(&priv->mutex);
+
+ dev->bounce_size = ps3flash_bounce_buffer.size;
+ dev->bounce_buf = ps3flash_bounce_buffer.address;
+
+ error = ps3stor_setup(dev, ps3flash_interrupt);
+ if (error)
+ goto fail_free_priv;
+
+ ps3flash_misc.parent = &dev->sbd.core;
+ error = misc_register(&ps3flash_misc);
+ if (error) {
+ dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
+ __func__, __LINE__, error);
+ goto fail_teardown;
+ }
+
+ dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
+ __func__, __LINE__, ps3flash_misc.minor);
+ return 0;
+
+fail_teardown:
+ ps3stor_teardown(dev);
+fail_free_priv:
+ kfree(priv);
+ dev->sbd.core.driver_data = NULL;
+fail:
+ ps3flash_dev = NULL;
+ return error;
+}
+
+static int ps3flash_remove(struct ps3_system_bus_device *_dev)
+{
+ struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+
+ misc_deregister(&ps3flash_misc);
+ ps3stor_teardown(dev);
+ kfree(dev->sbd.core.driver_data);
+ dev->sbd.core.driver_data = NULL;
+ ps3flash_dev = NULL;
+ return 0;
+}
+
+
+static struct ps3_system_bus_driver ps3flash = {
+ .match_id = PS3_MATCH_ID_STOR_FLASH,
+ .core.name = DEVICE_NAME,
+ .core.owner = THIS_MODULE,
+ .probe = ps3flash_probe,
+ .remove = ps3flash_remove,
+ .shutdown = ps3flash_remove,
+};
+
+
+static int __init ps3flash_init(void)
+{
+ return ps3_system_bus_driver_register(&ps3flash);
+}
+
+static void __exit ps3flash_exit(void)
+{
+ ps3_system_bus_driver_unregister(&ps3flash);
+}
+
+module_init(ps3flash_init);
+module_exit(ps3flash_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
+MODULE_AUTHOR("Sony Corporation");
+MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);