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![Geert Uytterhoeven](/assets/img/avatar_default.png)
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>
440 lines
11 KiB
C
440 lines
11 KiB
C
/*
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* PS3 FLASH ROM Storage Driver
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*
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* Copyright (C) 2007 Sony Computer Entertainment Inc.
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* Copyright 2007 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <asm/lv1call.h>
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#include <asm/ps3stor.h>
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#define DEVICE_NAME "ps3flash"
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#define FLASH_BLOCK_SIZE (256*1024)
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struct ps3flash_private {
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struct mutex mutex; /* Bounce buffer mutex */
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};
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static struct ps3_storage_device *ps3flash_dev;
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static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev,
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u64 lpar, u64 start_sector,
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u64 sectors, int write)
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{
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u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors,
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write);
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if (res) {
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dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
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__LINE__, write ? "write" : "read", res);
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return -EIO;
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}
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return sectors;
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}
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static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev,
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u64 start_sector, u64 sectors,
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unsigned int sector_offset)
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{
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u64 max_sectors, lpar;
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max_sectors = dev->bounce_size / dev->blk_size;
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if (sectors > max_sectors) {
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dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %lu\n",
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__func__, __LINE__, max_sectors);
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sectors = max_sectors;
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}
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lpar = dev->bounce_lpar + sector_offset * dev->blk_size;
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return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors,
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0);
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}
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static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev,
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u64 start_sector)
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{
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u64 sectors = dev->bounce_size / dev->blk_size;
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return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector,
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sectors, 1);
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}
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static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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loff_t res;
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mutex_lock(&file->f_mapping->host->i_mutex);
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switch (origin) {
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case 1:
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offset += file->f_pos;
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break;
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case 2:
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offset += dev->regions[dev->region_idx].size*dev->blk_size;
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break;
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}
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if (offset < 0) {
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res = -EINVAL;
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goto out;
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}
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file->f_pos = offset;
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res = file->f_pos;
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out:
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mutex_unlock(&file->f_mapping->host->i_mutex);
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return res;
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}
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static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
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loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = dev->sbd.core.driver_data;
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u64 size, start_sector, end_sector, offset;
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ssize_t sectors_read;
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size_t remaining, n;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
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__func__, __LINE__, count, *pos, buf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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return 0;
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if (*pos + count > size) {
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dev_dbg(&dev->sbd.core,
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"%s:%u Truncating count from %zu to %llu\n", __func__,
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__LINE__, count, size - *pos);
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count = size - *pos;
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}
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start_sector = *pos / dev->blk_size;
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offset = *pos % dev->blk_size;
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end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);
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remaining = count;
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do {
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mutex_lock(&priv->mutex);
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sectors_read = ps3flash_read_sectors(dev, start_sector,
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end_sector-start_sector,
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0);
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if (sectors_read < 0) {
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mutex_unlock(&priv->mutex);
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goto fail;
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}
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n = min(remaining, sectors_read*dev->blk_size-offset);
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
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__func__, __LINE__, n, dev->bounce_buf+offset, buf);
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if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
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mutex_unlock(&priv->mutex);
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sectors_read = -EFAULT;
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goto fail;
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}
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mutex_unlock(&priv->mutex);
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*pos += n;
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buf += n;
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remaining -= n;
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start_sector += sectors_read;
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offset = 0;
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} while (remaining > 0);
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return count;
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fail:
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return sectors_read;
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}
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static ssize_t ps3flash_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = dev->sbd.core.driver_data;
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u64 size, chunk_sectors, start_write_sector, end_write_sector,
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end_read_sector, start_read_sector, head, tail, offset;
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ssize_t res;
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size_t remaining, n;
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unsigned int sec_off;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
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__func__, __LINE__, count, *pos, buf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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return 0;
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if (*pos + count > size) {
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dev_dbg(&dev->sbd.core,
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"%s:%u Truncating count from %zu to %llu\n", __func__,
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__LINE__, count, size - *pos);
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count = size - *pos;
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}
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chunk_sectors = dev->bounce_size / dev->blk_size;
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start_write_sector = *pos / dev->bounce_size * chunk_sectors;
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offset = *pos % dev->bounce_size;
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end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) *
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chunk_sectors;
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end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
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start_read_sector = (*pos + count) / dev->blk_size;
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/*
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* As we have to write in 256 KiB chunks, while we can read in blk_size
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* (usually 512 bytes) chunks, we perform the following steps:
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* 1. Read from start_write_sector to end_read_sector ("head")
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* 2. Read from start_read_sector to end_write_sector ("tail")
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* 3. Copy data to buffer
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* 4. Write from start_write_sector to end_write_sector
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* All of this is complicated by using only one 256 KiB bounce buffer.
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*/
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head = end_read_sector - start_write_sector;
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tail = end_write_sector - start_read_sector;
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remaining = count;
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do {
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mutex_lock(&priv->mutex);
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if (end_read_sector >= start_read_sector) {
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/* Merge head and tail */
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dev_dbg(&dev->sbd.core,
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"Merged head and tail: %lu sectors at %lu\n",
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chunk_sectors, start_write_sector);
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res = ps3flash_read_sectors(dev, start_write_sector,
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chunk_sectors, 0);
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if (res < 0)
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goto fail;
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} else {
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if (head) {
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/* Read head */
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dev_dbg(&dev->sbd.core,
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"head: %lu sectors at %lu\n", head,
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start_write_sector);
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res = ps3flash_read_sectors(dev,
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start_write_sector,
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head, 0);
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if (res < 0)
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goto fail;
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}
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if (start_read_sector <
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start_write_sector+chunk_sectors) {
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/* Read tail */
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dev_dbg(&dev->sbd.core,
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"tail: %lu sectors at %lu\n", tail,
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start_read_sector);
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sec_off = start_read_sector-start_write_sector;
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res = ps3flash_read_sectors(dev,
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start_read_sector,
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tail, sec_off);
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if (res < 0)
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goto fail;
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}
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}
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n = min(remaining, dev->bounce_size-offset);
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
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__func__, __LINE__, n, buf, dev->bounce_buf+offset);
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if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
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res = -EFAULT;
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goto fail;
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}
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res = ps3flash_write_chunk(dev, start_write_sector);
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if (res < 0)
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goto fail;
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mutex_unlock(&priv->mutex);
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*pos += n;
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buf += n;
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remaining -= n;
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start_write_sector += chunk_sectors;
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head = 0;
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offset = 0;
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} while (remaining > 0);
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return count;
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fail:
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mutex_unlock(&priv->mutex);
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return res;
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}
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static irqreturn_t ps3flash_interrupt(int irq, void *data)
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{
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struct ps3_storage_device *dev = data;
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int res;
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u64 tag, status;
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res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
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if (tag != dev->tag)
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dev_err(&dev->sbd.core,
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"%s:%u: tag mismatch, got %lx, expected %lx\n",
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__func__, __LINE__, tag, dev->tag);
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if (res) {
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dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
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__func__, __LINE__, res, status);
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} else {
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dev->lv1_status = status;
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complete(&dev->done);
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}
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return IRQ_HANDLED;
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}
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static const struct file_operations ps3flash_fops = {
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.owner = THIS_MODULE,
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.llseek = ps3flash_llseek,
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.read = ps3flash_read,
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.write = ps3flash_write,
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};
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static struct miscdevice ps3flash_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = DEVICE_NAME,
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.fops = &ps3flash_fops,
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};
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static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
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{
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struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
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struct ps3flash_private *priv;
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int error;
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unsigned long tmp;
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tmp = dev->regions[dev->region_idx].start*dev->blk_size;
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if (tmp % FLASH_BLOCK_SIZE) {
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dev_err(&dev->sbd.core,
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"%s:%u region start %lu is not aligned\n", __func__,
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__LINE__, tmp);
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return -EINVAL;
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}
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tmp = dev->regions[dev->region_idx].size*dev->blk_size;
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if (tmp % FLASH_BLOCK_SIZE) {
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dev_err(&dev->sbd.core,
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"%s:%u region size %lu is not aligned\n", __func__,
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__LINE__, tmp);
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return -EINVAL;
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}
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/* use static buffer, kmalloc cannot allocate 256 KiB */
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if (!ps3flash_bounce_buffer.address)
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return -ENODEV;
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if (ps3flash_dev) {
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dev_err(&dev->sbd.core,
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"Only one FLASH device is supported\n");
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return -EBUSY;
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}
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ps3flash_dev = dev;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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error = -ENOMEM;
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goto fail;
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}
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dev->sbd.core.driver_data = priv;
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mutex_init(&priv->mutex);
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dev->bounce_size = ps3flash_bounce_buffer.size;
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dev->bounce_buf = ps3flash_bounce_buffer.address;
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error = ps3stor_setup(dev, ps3flash_interrupt);
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if (error)
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goto fail_free_priv;
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ps3flash_misc.parent = &dev->sbd.core;
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error = misc_register(&ps3flash_misc);
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if (error) {
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dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
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__func__, __LINE__, error);
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goto fail_teardown;
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}
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dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
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__func__, __LINE__, ps3flash_misc.minor);
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return 0;
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fail_teardown:
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ps3stor_teardown(dev);
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fail_free_priv:
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kfree(priv);
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dev->sbd.core.driver_data = NULL;
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fail:
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ps3flash_dev = NULL;
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return error;
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}
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static int ps3flash_remove(struct ps3_system_bus_device *_dev)
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{
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struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
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misc_deregister(&ps3flash_misc);
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ps3stor_teardown(dev);
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kfree(dev->sbd.core.driver_data);
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dev->sbd.core.driver_data = NULL;
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ps3flash_dev = NULL;
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return 0;
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}
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static struct ps3_system_bus_driver ps3flash = {
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.match_id = PS3_MATCH_ID_STOR_FLASH,
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.core.name = DEVICE_NAME,
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.core.owner = THIS_MODULE,
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.probe = ps3flash_probe,
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.remove = ps3flash_remove,
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.shutdown = ps3flash_remove,
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};
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static int __init ps3flash_init(void)
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{
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return ps3_system_bus_driver_register(&ps3flash);
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}
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static void __exit ps3flash_exit(void)
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{
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ps3_system_bus_driver_unregister(&ps3flash);
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}
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module_init(ps3flash_init);
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module_exit(ps3flash_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
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MODULE_AUTHOR("Sony Corporation");
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MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);
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