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block/swim3: Locking fixes
The old PowerMac swim3 driver has some "interesting" locking issues, using a private lock and failing to lock the queue before completing requests, which triggered WARN_ONs among others. This rips out the private lock, makes everything operate under the block queue lock, and generally makes things simpler. We used to also share a queue between the two possible instances which was problematic since we might pick the wrong controller in some cases, so make the queue and the current request per-instance and use queuedata to point to our private data which is a lot cleaner. We still share the queue lock but then, it's nearly impossible to actually use 2 swim3's simultaneously: one would need to have a Wallstreet PowerBook, the only machine afaik with two of these on the motherboard, and populate both hotswap bays with a floppy drive (the machine ships only with one), so nobody cares... While at it, add a little fix to clear up stale interrupts when loading the driver or plugging a floppy drive in a bay. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Benjamin Herrenschmidt
Jens Axboe
parent
dfaf3c036c
commit
b302545744
@ -16,6 +16,8 @@
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* handle GCR disks
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*/
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#undef DEBUG
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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@ -36,13 +38,11 @@
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#include <asm/machdep.h>
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#include <asm/pmac_feature.h>
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static DEFINE_MUTEX(swim3_mutex);
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static struct request_queue *swim3_queue;
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static struct gendisk *disks[2];
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static struct request *fd_req;
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#define MAX_FLOPPIES 2
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static DEFINE_MUTEX(swim3_mutex);
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static struct gendisk *disks[MAX_FLOPPIES];
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enum swim_state {
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idle,
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locating,
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@ -177,7 +177,6 @@ struct swim3 {
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struct floppy_state {
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enum swim_state state;
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spinlock_t lock;
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struct swim3 __iomem *swim3; /* hardware registers */
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struct dbdma_regs __iomem *dma; /* DMA controller registers */
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int swim3_intr; /* interrupt number for SWIM3 */
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@ -204,8 +203,20 @@ struct floppy_state {
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int wanted;
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struct macio_dev *mdev;
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char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
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int index;
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struct request *cur_req;
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};
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#define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
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#define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
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#define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
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#ifdef DEBUG
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#define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
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#else
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#define swim3_dbg(fmt, arg...) do { } while(0)
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#endif
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static struct floppy_state floppy_states[MAX_FLOPPIES];
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static int floppy_count = 0;
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static DEFINE_SPINLOCK(swim3_lock);
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@ -224,17 +235,8 @@ static unsigned short write_postamble[] = {
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0, 0, 0, 0, 0, 0
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};
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static void swim3_select(struct floppy_state *fs, int sel);
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static void swim3_action(struct floppy_state *fs, int action);
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static int swim3_readbit(struct floppy_state *fs, int bit);
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static void do_fd_request(struct request_queue * q);
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static void start_request(struct floppy_state *fs);
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static void set_timeout(struct floppy_state *fs, int nticks,
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void (*proc)(unsigned long));
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static void scan_track(struct floppy_state *fs);
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static void seek_track(struct floppy_state *fs, int n);
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static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
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static void setup_transfer(struct floppy_state *fs);
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static void act(struct floppy_state *fs);
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static void scan_timeout(unsigned long data);
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static void seek_timeout(unsigned long data);
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@ -254,20 +256,23 @@ static unsigned int floppy_check_events(struct gendisk *disk,
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unsigned int clearing);
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static int floppy_revalidate(struct gendisk *disk);
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static bool swim3_end_request(int err, unsigned int nr_bytes)
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static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes)
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{
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if (__blk_end_request(fd_req, err, nr_bytes))
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struct request *req = fs->cur_req;
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int rc;
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swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n",
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err, nr_bytes, req);
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if (err)
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nr_bytes = blk_rq_cur_bytes(req);
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rc = __blk_end_request(req, err, nr_bytes);
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if (rc)
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return true;
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fd_req = NULL;
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fs->cur_req = NULL;
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return false;
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}
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static bool swim3_end_request_cur(int err)
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{
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return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
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}
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static void swim3_select(struct floppy_state *fs, int sel)
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{
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struct swim3 __iomem *sw = fs->swim3;
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@ -303,50 +308,53 @@ static int swim3_readbit(struct floppy_state *fs, int bit)
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return (stat & DATA) == 0;
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}
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static void do_fd_request(struct request_queue * q)
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{
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int i;
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for(i=0; i<floppy_count; i++) {
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struct floppy_state *fs = &floppy_states[i];
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if (fs->mdev->media_bay &&
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check_media_bay(fs->mdev->media_bay) != MB_FD)
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continue;
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start_request(fs);
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}
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}
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static void start_request(struct floppy_state *fs)
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{
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struct request *req;
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unsigned long x;
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swim3_dbg("start request, initial state=%d\n", fs->state);
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if (fs->state == idle && fs->wanted) {
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fs->state = available;
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wake_up(&fs->wait);
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return;
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}
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while (fs->state == idle) {
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if (!fd_req) {
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fd_req = blk_fetch_request(swim3_queue);
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if (!fd_req)
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swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);
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if (!fs->cur_req) {
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fs->cur_req = blk_fetch_request(disks[fs->index]->queue);
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swim3_dbg(" fetched request %p\n", fs->cur_req);
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if (!fs->cur_req)
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break;
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}
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req = fd_req;
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#if 0
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printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
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req->rq_disk->disk_name, req->cmd,
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(long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
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printk(" errors=%d current_nr_sectors=%u\n",
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req->errors, blk_rq_cur_sectors(req));
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req = fs->cur_req;
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if (fs->mdev->media_bay &&
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check_media_bay(fs->mdev->media_bay) != MB_FD) {
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swim3_dbg("%s", " media bay absent, dropping req\n");
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swim3_end_request(fs, -ENODEV, 0);
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continue;
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}
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#if 0 /* This is really too verbose */
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swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
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req->rq_disk->disk_name, req->cmd,
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(long)blk_rq_pos(req), blk_rq_sectors(req),
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req->buffer);
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swim3_dbg(" errors=%d current_nr_sectors=%u\n",
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req->errors, blk_rq_cur_sectors(req));
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#endif
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if (blk_rq_pos(req) >= fs->total_secs) {
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swim3_end_request_cur(-EIO);
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swim3_dbg(" pos out of bounds (%ld, max is %ld)\n",
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(long)blk_rq_pos(req), (long)fs->total_secs);
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swim3_end_request(fs, -EIO, 0);
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continue;
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}
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if (fs->ejected) {
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swim3_end_request_cur(-EIO);
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swim3_dbg("%s", " disk ejected\n");
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swim3_end_request(fs, -EIO, 0);
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continue;
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}
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@ -354,7 +362,8 @@ static void start_request(struct floppy_state *fs)
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if (fs->write_prot < 0)
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fs->write_prot = swim3_readbit(fs, WRITE_PROT);
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if (fs->write_prot) {
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swim3_end_request_cur(-EIO);
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swim3_dbg("%s", " try to write, disk write protected\n");
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swim3_end_request(fs, -EIO, 0);
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continue;
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}
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}
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@ -369,7 +378,6 @@ static void start_request(struct floppy_state *fs)
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x = ((long)blk_rq_pos(req)) % fs->secpercyl;
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fs->head = x / fs->secpertrack;
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fs->req_sector = x % fs->secpertrack + 1;
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fd_req = req;
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fs->state = do_transfer;
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fs->retries = 0;
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@ -377,12 +385,14 @@ static void start_request(struct floppy_state *fs)
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}
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}
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static void do_fd_request(struct request_queue * q)
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{
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start_request(q->queuedata);
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}
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static void set_timeout(struct floppy_state *fs, int nticks,
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void (*proc)(unsigned long))
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{
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unsigned long flags;
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spin_lock_irqsave(&fs->lock, flags);
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if (fs->timeout_pending)
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del_timer(&fs->timeout);
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fs->timeout.expires = jiffies + nticks;
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@ -390,7 +400,6 @@ static void set_timeout(struct floppy_state *fs, int nticks,
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fs->timeout.data = (unsigned long) fs;
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add_timer(&fs->timeout);
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fs->timeout_pending = 1;
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spin_unlock_irqrestore(&fs->lock, flags);
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}
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static inline void scan_track(struct floppy_state *fs)
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@ -442,40 +451,45 @@ static inline void setup_transfer(struct floppy_state *fs)
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struct swim3 __iomem *sw = fs->swim3;
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struct dbdma_cmd *cp = fs->dma_cmd;
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struct dbdma_regs __iomem *dr = fs->dma;
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struct request *req = fs->cur_req;
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if (blk_rq_cur_sectors(fd_req) <= 0) {
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printk(KERN_ERR "swim3: transfer 0 sectors?\n");
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if (blk_rq_cur_sectors(req) <= 0) {
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swim3_warn("%s", "Transfer 0 sectors ?\n");
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return;
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}
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if (rq_data_dir(fd_req) == WRITE)
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if (rq_data_dir(req) == WRITE)
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n = 1;
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else {
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n = fs->secpertrack - fs->req_sector + 1;
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if (n > blk_rq_cur_sectors(fd_req))
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n = blk_rq_cur_sectors(fd_req);
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if (n > blk_rq_cur_sectors(req))
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n = blk_rq_cur_sectors(req);
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}
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swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n",
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fs->req_sector, fs->secpertrack, fs->head, n);
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fs->scount = n;
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swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
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out_8(&sw->sector, fs->req_sector);
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out_8(&sw->nsect, n);
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out_8(&sw->gap3, 0);
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out_le32(&dr->cmdptr, virt_to_bus(cp));
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if (rq_data_dir(fd_req) == WRITE) {
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if (rq_data_dir(req) == WRITE) {
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/* Set up 3 dma commands: write preamble, data, postamble */
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init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
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++cp;
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init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
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init_dma(cp, OUTPUT_MORE, req->buffer, 512);
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++cp;
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init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
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} else {
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init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
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init_dma(cp, INPUT_LAST, req->buffer, n * 512);
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}
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++cp;
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out_le16(&cp->command, DBDMA_STOP);
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out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
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in_8(&sw->error);
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out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
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if (rq_data_dir(fd_req) == WRITE)
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if (rq_data_dir(req) == WRITE)
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out_8(&sw->control_bis, WRITE_SECTORS);
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in_8(&sw->intr);
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out_le32(&dr->control, (RUN << 16) | RUN);
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@ -488,12 +502,16 @@ static inline void setup_transfer(struct floppy_state *fs)
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static void act(struct floppy_state *fs)
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{
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for (;;) {
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swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
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fs->state, fs->req_cyl, fs->cur_cyl);
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switch (fs->state) {
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case idle:
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return; /* XXX shouldn't get here */
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case locating:
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if (swim3_readbit(fs, TRACK_ZERO)) {
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swim3_dbg("%s", " locate track 0\n");
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fs->cur_cyl = 0;
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if (fs->req_cyl == 0)
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fs->state = do_transfer;
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@ -511,7 +529,7 @@ static void act(struct floppy_state *fs)
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break;
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}
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if (fs->req_cyl == fs->cur_cyl) {
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printk("whoops, seeking 0\n");
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swim3_warn("%s", "Whoops, seeking 0\n");
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fs->state = do_transfer;
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break;
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}
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@ -527,7 +545,9 @@ static void act(struct floppy_state *fs)
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case do_transfer:
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if (fs->cur_cyl != fs->req_cyl) {
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if (fs->retries > 5) {
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swim3_end_request_cur(-EIO);
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swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
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fs->req_cyl, fs->cur_cyl);
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swim3_end_request(fs, -EIO, 0);
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fs->state = idle;
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return;
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}
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@ -542,7 +562,7 @@ static void act(struct floppy_state *fs)
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return;
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default:
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printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
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swim3_err("Unknown state %d\n", fs->state);
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return;
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}
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}
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@ -552,59 +572,75 @@ static void scan_timeout(unsigned long data)
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{
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struct floppy_state *fs = (struct floppy_state *) data;
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struct swim3 __iomem *sw = fs->swim3;
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unsigned long flags;
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swim3_dbg("* scan timeout, state=%d\n", fs->state);
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spin_lock_irqsave(&swim3_lock, flags);
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fs->timeout_pending = 0;
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out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
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out_8(&sw->select, RELAX);
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out_8(&sw->intr_enable, 0);
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fs->cur_cyl = -1;
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if (fs->retries > 5) {
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swim3_end_request_cur(-EIO);
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swim3_end_request(fs, -EIO, 0);
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fs->state = idle;
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start_request(fs);
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} else {
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fs->state = jogging;
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act(fs);
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}
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spin_unlock_irqrestore(&swim3_lock, flags);
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}
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static void seek_timeout(unsigned long data)
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{
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struct floppy_state *fs = (struct floppy_state *) data;
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struct swim3 __iomem *sw = fs->swim3;
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unsigned long flags;
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swim3_dbg("* seek timeout, state=%d\n", fs->state);
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spin_lock_irqsave(&swim3_lock, flags);
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fs->timeout_pending = 0;
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out_8(&sw->control_bic, DO_SEEK);
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out_8(&sw->select, RELAX);
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out_8(&sw->intr_enable, 0);
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printk(KERN_ERR "swim3: seek timeout\n");
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swim3_end_request_cur(-EIO);
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swim3_err("%s", "Seek timeout\n");
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swim3_end_request(fs, -EIO, 0);
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fs->state = idle;
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start_request(fs);
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spin_unlock_irqrestore(&swim3_lock, flags);
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}
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static void settle_timeout(unsigned long data)
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{
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struct floppy_state *fs = (struct floppy_state *) data;
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struct swim3 __iomem *sw = fs->swim3;
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unsigned long flags;
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swim3_dbg("* settle timeout, state=%d\n", fs->state);
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spin_lock_irqsave(&swim3_lock, flags);
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fs->timeout_pending = 0;
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if (swim3_readbit(fs, SEEK_COMPLETE)) {
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out_8(&sw->select, RELAX);
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fs->state = locating;
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act(fs);
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return;
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goto unlock;
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}
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out_8(&sw->select, RELAX);
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if (fs->settle_time < 2*HZ) {
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++fs->settle_time;
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set_timeout(fs, 1, settle_timeout);
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return;
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goto unlock;
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}
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printk(KERN_ERR "swim3: seek settle timeout\n");
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swim3_end_request_cur(-EIO);
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swim3_err("%s", "Seek settle timeout\n");
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swim3_end_request(fs, -EIO, 0);
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fs->state = idle;
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start_request(fs);
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unlock:
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spin_unlock_irqrestore(&swim3_lock, flags);
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}
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static void xfer_timeout(unsigned long data)
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@ -612,8 +648,12 @@ static void xfer_timeout(unsigned long data)
|
||||
struct floppy_state *fs = (struct floppy_state *) data;
|
||||
struct swim3 __iomem *sw = fs->swim3;
|
||||
struct dbdma_regs __iomem *dr = fs->dma;
|
||||
unsigned long flags;
|
||||
int n;
|
||||
|
||||
swim3_dbg("* xfer timeout, state=%d\n", fs->state);
|
||||
|
||||
spin_lock_irqsave(&swim3_lock, flags);
|
||||
fs->timeout_pending = 0;
|
||||
out_le32(&dr->control, RUN << 16);
|
||||
/* We must wait a bit for dbdma to stop */
|
||||
@ -622,12 +662,13 @@ static void xfer_timeout(unsigned long data)
|
||||
out_8(&sw->intr_enable, 0);
|
||||
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
|
||||
out_8(&sw->select, RELAX);
|
||||
printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
|
||||
(rq_data_dir(fd_req)==WRITE? "writ": "read"),
|
||||
(long)blk_rq_pos(fd_req));
|
||||
swim3_end_request_cur(-EIO);
|
||||
swim3_err("Timeout %sing sector %ld\n",
|
||||
(rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
|
||||
(long)blk_rq_pos(fs->cur_req));
|
||||
swim3_end_request(fs, -EIO, 0);
|
||||
fs->state = idle;
|
||||
start_request(fs);
|
||||
spin_unlock_irqrestore(&swim3_lock, flags);
|
||||
}
|
||||
|
||||
static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
@ -638,12 +679,17 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
int stat, resid;
|
||||
struct dbdma_regs __iomem *dr;
|
||||
struct dbdma_cmd *cp;
|
||||
unsigned long flags;
|
||||
struct request *req = fs->cur_req;
|
||||
|
||||
swim3_dbg("* interrupt, state=%d\n", fs->state);
|
||||
|
||||
spin_lock_irqsave(&swim3_lock, flags);
|
||||
intr = in_8(&sw->intr);
|
||||
err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
|
||||
if ((intr & ERROR_INTR) && fs->state != do_transfer)
|
||||
printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
|
||||
fs->state, rq_data_dir(fd_req), intr, err);
|
||||
swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
|
||||
fs->state, rq_data_dir(req), intr, err);
|
||||
switch (fs->state) {
|
||||
case locating:
|
||||
if (intr & SEEN_SECTOR) {
|
||||
@ -653,10 +699,10 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
del_timer(&fs->timeout);
|
||||
fs->timeout_pending = 0;
|
||||
if (sw->ctrack == 0xff) {
|
||||
printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
|
||||
swim3_err("%s", "Seen sector but cyl=ff?\n");
|
||||
fs->cur_cyl = -1;
|
||||
if (fs->retries > 5) {
|
||||
swim3_end_request_cur(-EIO);
|
||||
swim3_end_request(fs, -EIO, 0);
|
||||
fs->state = idle;
|
||||
start_request(fs);
|
||||
} else {
|
||||
@ -668,8 +714,8 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
fs->cur_cyl = sw->ctrack;
|
||||
fs->cur_sector = sw->csect;
|
||||
if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
|
||||
printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
|
||||
fs->expect_cyl, fs->cur_cyl);
|
||||
swim3_err("Expected cyl %d, got %d\n",
|
||||
fs->expect_cyl, fs->cur_cyl);
|
||||
fs->state = do_transfer;
|
||||
act(fs);
|
||||
}
|
||||
@ -704,7 +750,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
fs->timeout_pending = 0;
|
||||
dr = fs->dma;
|
||||
cp = fs->dma_cmd;
|
||||
if (rq_data_dir(fd_req) == WRITE)
|
||||
if (rq_data_dir(req) == WRITE)
|
||||
++cp;
|
||||
/*
|
||||
* Check that the main data transfer has finished.
|
||||
@ -729,31 +775,32 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
if (intr & ERROR_INTR) {
|
||||
n = fs->scount - 1 - resid / 512;
|
||||
if (n > 0) {
|
||||
blk_update_request(fd_req, 0, n << 9);
|
||||
blk_update_request(req, 0, n << 9);
|
||||
fs->req_sector += n;
|
||||
}
|
||||
if (fs->retries < 5) {
|
||||
++fs->retries;
|
||||
act(fs);
|
||||
} else {
|
||||
printk("swim3: error %sing block %ld (err=%x)\n",
|
||||
rq_data_dir(fd_req) == WRITE? "writ": "read",
|
||||
(long)blk_rq_pos(fd_req), err);
|
||||
swim3_end_request_cur(-EIO);
|
||||
swim3_err("Error %sing block %ld (err=%x)\n",
|
||||
rq_data_dir(req) == WRITE? "writ": "read",
|
||||
(long)blk_rq_pos(req), err);
|
||||
swim3_end_request(fs, -EIO, 0);
|
||||
fs->state = idle;
|
||||
}
|
||||
} else {
|
||||
if ((stat & ACTIVE) == 0 || resid != 0) {
|
||||
/* musta been an error */
|
||||
printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
|
||||
printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
|
||||
fs->state, rq_data_dir(fd_req), intr, err);
|
||||
swim3_end_request_cur(-EIO);
|
||||
swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
|
||||
swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n",
|
||||
fs->state, rq_data_dir(req), intr, err);
|
||||
swim3_end_request(fs, -EIO, 0);
|
||||
fs->state = idle;
|
||||
start_request(fs);
|
||||
break;
|
||||
}
|
||||
if (swim3_end_request(0, fs->scount << 9)) {
|
||||
fs->retries = 0;
|
||||
if (swim3_end_request(fs, 0, fs->scount << 9)) {
|
||||
fs->req_sector += fs->scount;
|
||||
if (fs->req_sector > fs->secpertrack) {
|
||||
fs->req_sector -= fs->secpertrack;
|
||||
@ -770,8 +817,9 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
|
||||
start_request(fs);
|
||||
break;
|
||||
default:
|
||||
printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
|
||||
swim3_err("Don't know what to do in state %d\n", fs->state);
|
||||
}
|
||||
spin_unlock_irqrestore(&swim3_lock, flags);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
@ -781,26 +829,31 @@ static void fd_dma_interrupt(int irq, void *dev_id)
|
||||
}
|
||||
*/
|
||||
|
||||
/* Called under the mutex to grab exclusive access to a drive */
|
||||
static int grab_drive(struct floppy_state *fs, enum swim_state state,
|
||||
int interruptible)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&fs->lock, flags);
|
||||
if (fs->state != idle) {
|
||||
swim3_dbg("%s", "-> grab drive\n");
|
||||
|
||||
spin_lock_irqsave(&swim3_lock, flags);
|
||||
if (fs->state != idle && fs->state != available) {
|
||||
++fs->wanted;
|
||||
while (fs->state != available) {
|
||||
spin_unlock_irqrestore(&swim3_lock, flags);
|
||||
if (interruptible && signal_pending(current)) {
|
||||
--fs->wanted;
|
||||
spin_unlock_irqrestore(&fs->lock, flags);
|
||||
return -EINTR;
|
||||
}
|
||||
interruptible_sleep_on(&fs->wait);
|
||||
spin_lock_irqsave(&swim3_lock, flags);
|
||||
}
|
||||
--fs->wanted;
|
||||
}
|
||||
fs->state = state;
|
||||
spin_unlock_irqrestore(&fs->lock, flags);
|
||||
spin_unlock_irqrestore(&swim3_lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -808,10 +861,12 @@ static void release_drive(struct floppy_state *fs)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&fs->lock, flags);
|
||||
swim3_dbg("%s", "-> release drive\n");
|
||||
|
||||
spin_lock_irqsave(&swim3_lock, flags);
|
||||
fs->state = idle;
|
||||
start_request(fs);
|
||||
spin_unlock_irqrestore(&fs->lock, flags);
|
||||
spin_unlock_irqrestore(&swim3_lock, flags);
|
||||
}
|
||||
|
||||
static int fd_eject(struct floppy_state *fs)
|
||||
@ -966,6 +1021,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
|
||||
{
|
||||
struct floppy_state *fs = disk->private_data;
|
||||
struct swim3 __iomem *sw = fs->swim3;
|
||||
|
||||
mutex_lock(&swim3_mutex);
|
||||
if (fs->ref_count > 0 && --fs->ref_count == 0) {
|
||||
swim3_action(fs, MOTOR_OFF);
|
||||
@ -1031,30 +1087,48 @@ static const struct block_device_operations floppy_fops = {
|
||||
.revalidate_disk= floppy_revalidate,
|
||||
};
|
||||
|
||||
static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
|
||||
{
|
||||
struct floppy_state *fs = macio_get_drvdata(mdev);
|
||||
struct swim3 __iomem *sw = fs->swim3;
|
||||
|
||||
if (!fs)
|
||||
return;
|
||||
if (mb_state != MB_FD)
|
||||
return;
|
||||
|
||||
/* Clear state */
|
||||
out_8(&sw->intr_enable, 0);
|
||||
in_8(&sw->intr);
|
||||
in_8(&sw->error);
|
||||
}
|
||||
|
||||
static int swim3_add_device(struct macio_dev *mdev, int index)
|
||||
{
|
||||
struct device_node *swim = mdev->ofdev.dev.of_node;
|
||||
struct floppy_state *fs = &floppy_states[index];
|
||||
int rc = -EBUSY;
|
||||
|
||||
/* Do this first for message macros */
|
||||
memset(fs, 0, sizeof(*fs));
|
||||
fs->mdev = mdev;
|
||||
fs->index = index;
|
||||
|
||||
/* Check & Request resources */
|
||||
if (macio_resource_count(mdev) < 2) {
|
||||
printk(KERN_WARNING "ifd%d: no address for %s\n",
|
||||
index, swim->full_name);
|
||||
swim3_err("%s", "No address in device-tree\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
if (macio_irq_count(mdev) < 2) {
|
||||
printk(KERN_WARNING "fd%d: no intrs for device %s\n",
|
||||
index, swim->full_name);
|
||||
if (macio_irq_count(mdev) < 1) {
|
||||
swim3_err("%s", "No interrupt in device-tree\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
|
||||
printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
|
||||
index, swim->full_name);
|
||||
swim3_err("%s", "Can't request mmio resource\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
|
||||
printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
|
||||
index, swim->full_name);
|
||||
swim3_err("%s", "Can't request dma resource\n");
|
||||
macio_release_resource(mdev, 0);
|
||||
return -EBUSY;
|
||||
}
|
||||
@ -1063,22 +1137,18 @@ static int swim3_add_device(struct macio_dev *mdev, int index)
|
||||
if (mdev->media_bay == NULL)
|
||||
pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
|
||||
|
||||
memset(fs, 0, sizeof(*fs));
|
||||
spin_lock_init(&fs->lock);
|
||||
fs->state = idle;
|
||||
fs->swim3 = (struct swim3 __iomem *)
|
||||
ioremap(macio_resource_start(mdev, 0), 0x200);
|
||||
if (fs->swim3 == NULL) {
|
||||
printk("fd%d: couldn't map registers for %s\n",
|
||||
index, swim->full_name);
|
||||
swim3_err("%s", "Couldn't map mmio registers\n");
|
||||
rc = -ENOMEM;
|
||||
goto out_release;
|
||||
}
|
||||
fs->dma = (struct dbdma_regs __iomem *)
|
||||
ioremap(macio_resource_start(mdev, 1), 0x200);
|
||||
if (fs->dma == NULL) {
|
||||
printk("fd%d: couldn't map DMA for %s\n",
|
||||
index, swim->full_name);
|
||||
swim3_err("%s", "Couldn't map dma registers\n");
|
||||
iounmap(fs->swim3);
|
||||
rc = -ENOMEM;
|
||||
goto out_release;
|
||||
@ -1090,31 +1160,25 @@ static int swim3_add_device(struct macio_dev *mdev, int index)
|
||||
fs->secpercyl = 36;
|
||||
fs->secpertrack = 18;
|
||||
fs->total_secs = 2880;
|
||||
fs->mdev = mdev;
|
||||
init_waitqueue_head(&fs->wait);
|
||||
|
||||
fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
|
||||
memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
|
||||
st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
|
||||
|
||||
if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
|
||||
swim3_mb_event(mdev, MB_FD);
|
||||
|
||||
if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
|
||||
printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
|
||||
index, fs->swim3_intr, swim->full_name);
|
||||
swim3_err("%s", "Couldn't request interrupt\n");
|
||||
pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
|
||||
goto out_unmap;
|
||||
return -EBUSY;
|
||||
}
|
||||
/*
|
||||
if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
|
||||
printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
|
||||
fs->dma_intr);
|
||||
return -EBUSY;
|
||||
}
|
||||
*/
|
||||
|
||||
init_timer(&fs->timeout);
|
||||
|
||||
printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
|
||||
swim3_info("SWIM3 floppy controller %s\n",
|
||||
mdev->media_bay ? "in media bay" : "");
|
||||
|
||||
return 0;
|
||||
@ -1132,41 +1196,42 @@ static int swim3_add_device(struct macio_dev *mdev, int index)
|
||||
|
||||
static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
|
||||
{
|
||||
int i, rc;
|
||||
struct gendisk *disk;
|
||||
int index, rc;
|
||||
|
||||
index = floppy_count++;
|
||||
if (index >= MAX_FLOPPIES)
|
||||
return -ENXIO;
|
||||
|
||||
/* Add the drive */
|
||||
rc = swim3_add_device(mdev, floppy_count);
|
||||
rc = swim3_add_device(mdev, index);
|
||||
if (rc)
|
||||
return rc;
|
||||
/* Now register that disk. Same comment about failure handling */
|
||||
disk = disks[index] = alloc_disk(1);
|
||||
if (disk == NULL)
|
||||
return -ENOMEM;
|
||||
disk->queue = blk_init_queue(do_fd_request, &swim3_lock);
|
||||
if (disk->queue == NULL) {
|
||||
put_disk(disk);
|
||||
return -ENOMEM;
|
||||
}
|
||||
disk->queue->queuedata = &floppy_states[index];
|
||||
|
||||
/* Now create the queue if not there yet */
|
||||
if (swim3_queue == NULL) {
|
||||
if (index == 0) {
|
||||
/* If we failed, there isn't much we can do as the driver is still
|
||||
* too dumb to remove the device, just bail out
|
||||
*/
|
||||
if (register_blkdev(FLOPPY_MAJOR, "fd"))
|
||||
return 0;
|
||||
swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
|
||||
if (swim3_queue == NULL) {
|
||||
unregister_blkdev(FLOPPY_MAJOR, "fd");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Now register that disk. Same comment about failure handling */
|
||||
i = floppy_count++;
|
||||
disk = disks[i] = alloc_disk(1);
|
||||
if (disk == NULL)
|
||||
return 0;
|
||||
|
||||
disk->major = FLOPPY_MAJOR;
|
||||
disk->first_minor = i;
|
||||
disk->first_minor = index;
|
||||
disk->fops = &floppy_fops;
|
||||
disk->private_data = &floppy_states[i];
|
||||
disk->queue = swim3_queue;
|
||||
disk->private_data = &floppy_states[index];
|
||||
disk->flags |= GENHD_FL_REMOVABLE;
|
||||
sprintf(disk->disk_name, "fd%d", i);
|
||||
sprintf(disk->disk_name, "fd%d", index);
|
||||
set_capacity(disk, 2880);
|
||||
add_disk(disk);
|
||||
|
||||
@ -1194,6 +1259,9 @@ static struct macio_driver swim3_driver =
|
||||
.of_match_table = swim3_match,
|
||||
},
|
||||
.probe = swim3_attach,
|
||||
#ifdef CONFIG_PMAC_MEDIABAY
|
||||
.mediabay_event = swim3_mb_event,
|
||||
#endif
|
||||
#if 0
|
||||
.suspend = swim3_suspend,
|
||||
.resume = swim3_resume,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user