diff options
author | Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> | 2007-07-21 15:37:48 +0400 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-22 04:49:16 +0400 |
commit | f96526354bb0824f3ce550a028606d2f94435b92 (patch) | |
tree | 9bc2730a69a4b3fba1750e75e7d6ee6474e6f6b2 /drivers/char/ps3flash.c | |
parent | 9aea8cbf2866c5680e30ff473341b7c5e93f7442 (diff) | |
download | linux-f96526354bb0824f3ce550a028606d2f94435b92.tar.xz |
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>
Diffstat (limited to 'drivers/char/ps3flash.c')
-rw-r--r-- | drivers/char/ps3flash.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c new file mode 100644 index 000000000000..79b6f461be75 --- /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); |