Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f96526354bb0824f3ce550a028606d2f94435b92
Commit:     f96526354bb0824f3ce550a028606d2f94435b92
Parent:     9aea8cbf2866c5680e30ff473341b7c5e93f7442
Author:     Geert Uytterhoeven <[EMAIL PROTECTED]>
AuthorDate: Sat Jul 21 04:37:48 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sat Jul 21 17:49:16 2007 -0700

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Geert Uytterhoeven <[EMAIL PROTECTED]>
    Cc: Jens Axboe <[EMAIL PROTECTED]>
    Cc: James Bottomley <[EMAIL PROTECTED]>
    Cc: Paul Mackerras <[EMAIL PROTECTED]>
    Cc: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 arch/powerpc/platforms/ps3/Kconfig |   15 ++
 drivers/char/Makefile              |    2 +
 drivers/char/ps3flash.c            |  440 ++++++++++++++++++++++++++++++++++++
 3 files changed, 457 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/ps3/Kconfig 
b/arch/powerpc/platforms/ps3/Kconfig
index f609291..d4fc74f 100644
--- a/arch/powerpc/platforms/ps3/Kconfig
+++ b/arch/powerpc/platforms/ps3/Kconfig
@@ -123,4 +123,19 @@ config PS3_ROM
          In general, all users will say Y or M.
          Also make sure to say Y or M to "SCSI CDROM support" later.
 
+config PS3_FLASH
+       tristate "PS3 FLASH ROM Storage Driver"
+       depends on PPC_PS3
+       select PS3_STORAGE
+       help
+         Include support for the PS3 FLASH ROM Storage.
+
+         This support is required to access the PS3 FLASH ROM, which
+         contains the boot loader and some boot options.
+         In general, all users will say Y or M.
+
+         As this driver needs a fixed buffer of 256 KiB of memory, it can
+         be disabled on the kernel command line using "ps3flash=off", to
+         not allocate this fixed buffer.
+
 endmenu
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 4e6f387..8fecaf4 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -107,6 +107,8 @@ obj-$(CONFIG_IPMI_HANDLER)  += ipmi/
 obj-$(CONFIG_HANGCHECK_TIMER)  += hangcheck-timer.o
 obj-$(CONFIG_TCG_TPM)          += tpm/
 
+obj-$(CONFIG_PS3_FLASH)                += ps3flash.o
+
 # Files generated that shall be removed upon make clean
 clean-files := consolemap_deftbl.c defkeymap.c
 
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);
-
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