diff options
Diffstat (limited to 'drivers/block/swim3.c')
| -rw-r--r-- | drivers/block/swim3.c | 1290 |
1 files changed, 1290 insertions, 0 deletions
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c new file mode 100644 index 0000000000..c2bc858263 --- /dev/null +++ b/drivers/block/swim3.c @@ -0,0 +1,1290 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for the SWIM3 (Super Woz Integrated Machine 3) + * floppy controller found on Power Macintoshes. + * + * Copyright (C) 1996 Paul Mackerras. + */ + +/* + * TODO: + * handle 2 drives + * handle GCR disks + */ + +#undef DEBUG + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/sched/signal.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/fd.h> +#include <linux/ioctl.h> +#include <linux/blk-mq.h> +#include <linux/interrupt.h> +#include <linux/mutex.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/wait.h> +#include <linux/major.h> +#include <asm/io.h> +#include <asm/dbdma.h> +#include <asm/prom.h> +#include <linux/uaccess.h> +#include <asm/mediabay.h> +#include <asm/machdep.h> +#include <asm/pmac_feature.h> + +#define MAX_FLOPPIES 2 + +static DEFINE_MUTEX(swim3_mutex); +static struct gendisk *disks[MAX_FLOPPIES]; + +enum swim_state { + idle, + locating, + seeking, + settling, + do_transfer, + jogging, + available, + revalidating, + ejecting +}; + +#define REG(x) unsigned char x; char x ## _pad[15]; + +/* + * The names for these registers mostly represent speculation on my part. + * It will be interesting to see how close they are to the names Apple uses. + */ +struct swim3 { + REG(data); + REG(timer); /* counts down at 1MHz */ + REG(error); + REG(mode); + REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ + REG(setup); + REG(control); /* writing bits clears them */ + REG(status); /* writing bits sets them in control */ + REG(intr); + REG(nseek); /* # tracks to seek */ + REG(ctrack); /* current track number */ + REG(csect); /* current sector number */ + REG(gap3); /* size of gap 3 in track format */ + REG(sector); /* sector # to read or write */ + REG(nsect); /* # sectors to read or write */ + REG(intr_enable); +}; + +#define control_bic control +#define control_bis status + +/* Bits in select register */ +#define CA_MASK 7 +#define LSTRB 8 + +/* Bits in control register */ +#define DO_SEEK 0x80 +#define FORMAT 0x40 +#define SELECT 0x20 +#define WRITE_SECTORS 0x10 +#define DO_ACTION 0x08 +#define DRIVE2_ENABLE 0x04 +#define DRIVE_ENABLE 0x02 +#define INTR_ENABLE 0x01 + +/* Bits in status register */ +#define FIFO_1BYTE 0x80 +#define FIFO_2BYTE 0x40 +#define ERROR 0x20 +#define DATA 0x08 +#define RDDATA 0x04 +#define INTR_PENDING 0x02 +#define MARK_BYTE 0x01 + +/* Bits in intr and intr_enable registers */ +#define ERROR_INTR 0x20 +#define DATA_CHANGED 0x10 +#define TRANSFER_DONE 0x08 +#define SEEN_SECTOR 0x04 +#define SEEK_DONE 0x02 +#define TIMER_DONE 0x01 + +/* Bits in error register */ +#define ERR_DATA_CRC 0x80 +#define ERR_ADDR_CRC 0x40 +#define ERR_OVERRUN 0x04 +#define ERR_UNDERRUN 0x01 + +/* Bits in setup register */ +#define S_SW_RESET 0x80 +#define S_GCR_WRITE 0x40 +#define S_IBM_DRIVE 0x20 +#define S_TEST_MODE 0x10 +#define S_FCLK_DIV2 0x08 +#define S_GCR 0x04 +#define S_COPY_PROT 0x02 +#define S_INV_WDATA 0x01 + +/* Select values for swim3_action */ +#define SEEK_POSITIVE 0 +#define SEEK_NEGATIVE 4 +#define STEP 1 +#define MOTOR_ON 2 +#define MOTOR_OFF 6 +#define INDEX 3 +#define EJECT 7 +#define SETMFM 9 +#define SETGCR 13 + +/* Select values for swim3_select and swim3_readbit */ +#define STEP_DIR 0 +#define STEPPING 1 +#define MOTOR_ON 2 +#define RELAX 3 /* also eject in progress */ +#define READ_DATA_0 4 +#define ONEMEG_DRIVE 5 +#define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ +#define DRIVE_PRESENT 7 +#define DISK_IN 8 +#define WRITE_PROT 9 +#define TRACK_ZERO 10 +#define TACHO 11 +#define READ_DATA_1 12 +#define GCR_MODE 13 +#define SEEK_COMPLETE 14 +#define TWOMEG_MEDIA 15 + +/* Definitions of values used in writing and formatting */ +#define DATA_ESCAPE 0x99 +#define GCR_SYNC_EXC 0x3f +#define GCR_SYNC_CONV 0x80 +#define GCR_FIRST_MARK 0xd5 +#define GCR_SECOND_MARK 0xaa +#define GCR_ADDR_MARK "\xd5\xaa\x00" +#define GCR_DATA_MARK "\xd5\xaa\x0b" +#define GCR_SLIP_BYTE "\x27\xaa" +#define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" + +#define DATA_99 "\x99\x99" +#define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" +#define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" +#define MFM_GAP_LEN 12 + +struct floppy_state { + enum swim_state state; + struct swim3 __iomem *swim3; /* hardware registers */ + struct dbdma_regs __iomem *dma; /* DMA controller registers */ + int swim3_intr; /* interrupt number for SWIM3 */ + int dma_intr; /* interrupt number for DMA channel */ + int cur_cyl; /* cylinder head is on, or -1 */ + int cur_sector; /* last sector we saw go past */ + int req_cyl; /* the cylinder for the current r/w request */ + int head; /* head number ditto */ + int req_sector; /* sector number ditto */ + int scount; /* # sectors we're transferring at present */ + int retries; + int settle_time; + int secpercyl; /* disk geometry information */ + int secpertrack; + int total_secs; + int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ + struct dbdma_cmd *dma_cmd; + int ref_count; + int expect_cyl; + struct timer_list timeout; + int timeout_pending; + int ejected; + wait_queue_head_t wait; + int wanted; + struct macio_dev *mdev; + char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; + int index; + struct request *cur_req; + struct blk_mq_tag_set tag_set; +}; + +#define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) +#define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) +#define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) + +#ifdef DEBUG +#define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) +#else +#define swim3_dbg(fmt, arg...) do { } while(0) +#endif + +static struct floppy_state floppy_states[MAX_FLOPPIES]; +static int floppy_count = 0; +static DEFINE_SPINLOCK(swim3_lock); + +static unsigned short write_preamble[] = { + 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ + 0, 0, 0, 0, 0, 0, /* sync field */ + 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ + 0x990f /* no escape for 512 bytes */ +}; + +static unsigned short write_postamble[] = { + 0x9904, /* insert CRC */ + 0x4e4e, 0x4e4e, + 0x9908, /* stop writing */ + 0, 0, 0, 0, 0, 0 +}; + +static void seek_track(struct floppy_state *fs, int n); +static void act(struct floppy_state *fs); +static void scan_timeout(struct timer_list *t); +static void seek_timeout(struct timer_list *t); +static void settle_timeout(struct timer_list *t); +static void xfer_timeout(struct timer_list *t); +static irqreturn_t swim3_interrupt(int irq, void *dev_id); +/*static void fd_dma_interrupt(int irq, void *dev_id);*/ +static int grab_drive(struct floppy_state *fs, enum swim_state state, + int interruptible); +static void release_drive(struct floppy_state *fs); +static int fd_eject(struct floppy_state *fs); +static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long param); +static int floppy_open(struct gendisk *disk, blk_mode_t mode); +static unsigned int floppy_check_events(struct gendisk *disk, + unsigned int clearing); +static int floppy_revalidate(struct gendisk *disk); + +static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes) +{ + struct request *req = fs->cur_req; + + swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", + err, nr_bytes, req); + + if (err) + nr_bytes = blk_rq_cur_bytes(req); + if (blk_update_request(req, err, nr_bytes)) + return true; + __blk_mq_end_request(req, err); + fs->cur_req = NULL; + return false; +} + +static void swim3_select(struct floppy_state *fs, int sel) +{ + struct swim3 __iomem *sw = fs->swim3; + + out_8(&sw->select, RELAX); + if (sel & 8) + out_8(&sw->control_bis, SELECT); + else + out_8(&sw->control_bic, SELECT); + out_8(&sw->select, sel & CA_MASK); +} + +static void swim3_action(struct floppy_state *fs, int action) +{ + struct swim3 __iomem *sw = fs->swim3; + + swim3_select(fs, action); + udelay(1); + out_8(&sw->select, sw->select | LSTRB); + udelay(2); + out_8(&sw->select, sw->select & ~LSTRB); + udelay(1); +} + +static int swim3_readbit(struct floppy_state *fs, int bit) +{ + struct swim3 __iomem *sw = fs->swim3; + int stat; + + swim3_select(fs, bit); + udelay(1); + stat = in_8(&sw->status); + return (stat & DATA) == 0; +} + +static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct floppy_state *fs = hctx->queue->queuedata; + struct request *req = bd->rq; + unsigned long x; + + spin_lock_irq(&swim3_lock); + if (fs->cur_req || fs->state != idle) { + spin_unlock_irq(&swim3_lock); + return BLK_STS_DEV_RESOURCE; + } + blk_mq_start_request(req); + fs->cur_req = req; + if (fs->mdev->media_bay && + check_media_bay(fs->mdev->media_bay) != MB_FD) { + swim3_dbg("%s", " media bay absent, dropping req\n"); + swim3_end_request(fs, BLK_STS_IOERR, 0); + goto out; + } + if (fs->ejected) { + swim3_dbg("%s", " disk ejected\n"); + swim3_end_request(fs, BLK_STS_IOERR, 0); + goto out; + } + if (rq_data_dir(req) == WRITE) { + if (fs->write_prot < 0) + fs->write_prot = swim3_readbit(fs, WRITE_PROT); + if (fs->write_prot) { + swim3_dbg("%s", " try to write, disk write protected\n"); + swim3_end_request(fs, BLK_STS_IOERR, 0); + goto out; + } + } + + /* + * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be + * 64 bits, but it will never go past 32 bits for this driver anyway, so + * we can safely cast it down and not have to do a 64/32 division + */ + fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; + x = ((long)blk_rq_pos(req)) % fs->secpercyl; + fs->head = x / fs->secpertrack; + fs->req_sector = x % fs->secpertrack + 1; + fs->state = do_transfer; + fs->retries = 0; + + act(fs); + +out: + spin_unlock_irq(&swim3_lock); + return BLK_STS_OK; +} + +static void set_timeout(struct floppy_state *fs, int nticks, + void (*proc)(struct timer_list *t)) +{ + if (fs->timeout_pending) + del_timer(&fs->timeout); + fs->timeout.expires = jiffies + nticks; + fs->timeout.function = proc; + add_timer(&fs->timeout); + fs->timeout_pending = 1; +} + +static inline void scan_track(struct floppy_state *fs) +{ + struct swim3 __iomem *sw = fs->swim3; + + swim3_select(fs, READ_DATA_0); + in_8(&sw->intr); /* clear SEEN_SECTOR bit */ + in_8(&sw->error); + out_8(&sw->intr_enable, SEEN_SECTOR); + out_8(&sw->control_bis, DO_ACTION); + /* enable intr when track found */ + set_timeout(fs, HZ, scan_timeout); /* enable timeout */ +} + +static inline void seek_track(struct floppy_state *fs, int n) +{ + struct swim3 __iomem *sw = fs->swim3; + + if (n >= 0) { + swim3_action(fs, SEEK_POSITIVE); + sw->nseek = n; + } else { + swim3_action(fs, SEEK_NEGATIVE); + sw->nseek = -n; + } + fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; + swim3_select(fs, STEP); + in_8(&sw->error); + /* enable intr when seek finished */ + out_8(&sw->intr_enable, SEEK_DONE); + out_8(&sw->control_bis, DO_SEEK); + set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ + fs->settle_time = 0; +} + +/* + * XXX: this is a horrible hack, but at least allows ppc32 to get + * out of defining virt_to_bus, and this driver out of using the + * deprecated block layer bounce buffering for highmem addresses + * for no good reason. + */ +static unsigned long swim3_phys_to_bus(phys_addr_t paddr) +{ + return paddr + PCI_DRAM_OFFSET; +} + +static phys_addr_t swim3_bio_phys(struct bio *bio) +{ + return page_to_phys(bio_page(bio)) + bio_offset(bio); +} + +static inline void init_dma(struct dbdma_cmd *cp, int cmd, + phys_addr_t paddr, int count) +{ + cp->req_count = cpu_to_le16(count); + cp->command = cpu_to_le16(cmd); + cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr)); + cp->xfer_status = 0; +} + +static inline void setup_transfer(struct floppy_state *fs) +{ + int n; + struct swim3 __iomem *sw = fs->swim3; + struct dbdma_cmd *cp = fs->dma_cmd; + struct dbdma_regs __iomem *dr = fs->dma; + struct request *req = fs->cur_req; + + if (blk_rq_cur_sectors(req) <= 0) { + swim3_warn("%s", "Transfer 0 sectors ?\n"); + return; + } + if (rq_data_dir(req) == WRITE) + n = 1; + else { + n = fs->secpertrack - fs->req_sector + 1; + if (n > blk_rq_cur_sectors(req)) + n = blk_rq_cur_sectors(req); + } + + swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", + fs->req_sector, fs->secpertrack, fs->head, n); + + fs->scount = n; + swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); + out_8(&sw->sector, fs->req_sector); + out_8(&sw->nsect, n); + out_8(&sw->gap3, 0); + out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp))); + if (rq_data_dir(req) == WRITE) { + /* Set up 3 dma commands: write preamble, data, postamble */ + init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble), + sizeof(write_preamble)); + ++cp; + init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512); + ++cp; + init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble), + sizeof(write_postamble)); + } else { + init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), n * 512); + } + ++cp; + out_le16(&cp->command, DBDMA_STOP); + out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); + in_8(&sw->error); + out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); + if (rq_data_dir(req) == WRITE) + out_8(&sw->control_bis, WRITE_SECTORS); + in_8(&sw->intr); + out_le32(&dr->control, (RUN << 16) | RUN); + /* enable intr when transfer complete */ + out_8(&sw->intr_enable, TRANSFER_DONE); + out_8(&sw->control_bis, DO_ACTION); + set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ +} + +static void act(struct floppy_state *fs) +{ + for (;;) { + swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", + fs->state, fs->req_cyl, fs->cur_cyl); + + switch (fs->state) { + case idle: + return; /* XXX shouldn't get here */ + + case locating: + if (swim3_readbit(fs, TRACK_ZERO)) { + swim3_dbg("%s", " locate track 0\n"); + fs->cur_cyl = 0; + if (fs->req_cyl == 0) + fs->state = do_transfer; + else + fs->state = seeking; + break; + } + scan_track(fs); + return; + + case seeking: + if (fs->cur_cyl < 0) { + fs->expect_cyl = -1; + fs->state = locating; + break; + } + if (fs->req_cyl == fs->cur_cyl) { + swim3_warn("%s", "Whoops, seeking 0\n"); + fs->state = do_transfer; + break; + } + seek_track(fs, fs->req_cyl - fs->cur_cyl); + return; + + case settling: + /* check for SEEK_COMPLETE after 30ms */ + fs->settle_time = (HZ + 32) / 33; + set_timeout(fs, fs->settle_time, settle_timeout); + return; + + case do_transfer: + if (fs->cur_cyl != fs->req_cyl) { + if (fs->retries > 5) { + swim3_err("Wrong cylinder in transfer, want: %d got %d\n", + fs->req_cyl, fs->cur_cyl); + swim3_end_request(fs, BLK_STS_IOERR, 0); + fs->state = idle; + return; + } + fs->state = seeking; + break; + } + setup_transfer(fs); + return; + + case jogging: + seek_track(fs, -5); + return; + + default: + swim3_err("Unknown state %d\n", fs->state); + return; + } + } +} + +static void scan_timeout(struct timer_list *t) +{ + struct floppy_state *fs = from_timer(fs, t, timeout); + struct swim3 __iomem *sw = fs->swim3; + unsigned long flags; + + swim3_dbg("* scan timeout, state=%d\n", fs->state); + + spin_lock_irqsave(&swim3_lock, flags); + fs->timeout_pending = 0; + out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); + out_8(&sw->select, RELAX); + out_8(&sw->intr_enable, 0); + fs->cur_cyl = -1; + if (fs->retries > 5) { + swim3_end_request(fs, BLK_STS_IOERR, 0); + fs->state = idle; + } else { + fs->state = jogging; + act(fs); + } + spin_unlock_irqrestore(&swim3_lock, flags); +} + +static void seek_timeout(struct timer_list *t) +{ + struct floppy_state *fs = from_timer(fs, t, timeout); + struct swim3 __iomem *sw = fs->swim3; + unsigned long flags; + + swim3_dbg("* seek timeout, state=%d\n", fs->state); + + spin_lock_irqsave(&swim3_lock, flags); + fs->timeout_pending = 0; + out_8(&sw->control_bic, DO_SEEK); + out_8(&sw->select, RELAX); + out_8(&sw->intr_enable, 0); + swim3_err("%s", "Seek timeout\n"); + swim3_end_request(fs, BLK_STS_IOERR, 0); + fs->state = idle; + spin_unlock_irqrestore(&swim3_lock, flags); +} + +static void settle_timeout(struct timer_list *t) +{ + struct floppy_state *fs = from_timer(fs, t, timeout); + struct swim3 __iomem *sw = fs->swim3; + unsigned long flags; + + swim3_dbg("* settle timeout, state=%d\n", fs->state); + + spin_lock_irqsave(&swim3_lock, flags); + fs->timeout_pending = 0; + if (swim3_readbit(fs, SEEK_COMPLETE)) { + out_8(&sw->select, RELAX); + fs->state = locating; + act(fs); + goto unlock; + } + out_8(&sw->select, RELAX); + if (fs->settle_time < 2*HZ) { + ++fs->settle_time; + set_timeout(fs, 1, settle_timeout); + goto unlock; + } + swim3_err("%s", "Seek settle timeout\n"); + swim3_end_request(fs, BLK_STS_IOERR, 0); + fs->state = idle; + unlock: + spin_unlock_irqrestore(&swim3_lock, flags); +} + +static void xfer_timeout(struct timer_list *t) +{ + struct floppy_state *fs = from_timer(fs, t, timeout); + 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 */ + for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) + udelay(1); + out_8(&sw->intr_enable, 0); + out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); + out_8(&sw->select, RELAX); + 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, BLK_STS_IOERR, 0); + fs->state = idle; + spin_unlock_irqrestore(&swim3_lock, flags); +} + +static irqreturn_t swim3_interrupt(int irq, void *dev_id) +{ + struct floppy_state *fs = (struct floppy_state *) dev_id; + struct swim3 __iomem *sw = fs->swim3; + int intr, err, n; + 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) + 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) { + out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); + out_8(&sw->select, RELAX); + out_8(&sw->intr_enable, 0); + del_timer(&fs->timeout); + fs->timeout_pending = 0; + if (sw->ctrack == 0xff) { + swim3_err("%s", "Seen sector but cyl=ff?\n"); + fs->cur_cyl = -1; + if (fs->retries > 5) { + swim3_end_request(fs, BLK_STS_IOERR, 0); + fs->state = idle; + } else { + fs->state = jogging; + act(fs); + } + break; + } + fs->cur_cyl = sw->ctrack; + fs->cur_sector = sw->csect; + if (fs->expect_cyl != -1 && 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); + } + break; + case seeking: + case jogging: + if (sw->nseek == 0) { + out_8(&sw->control_bic, DO_SEEK); + out_8(&sw->select, RELAX); + out_8(&sw->intr_enable, 0); + del_timer(&fs->timeout); + fs->timeout_pending = 0; + if (fs->state == seeking) + ++fs->retries; + fs->state = settling; + act(fs); + } + break; + case settling: + out_8(&sw->intr_enable, 0); + del_timer(&fs->timeout); + fs->timeout_pending = 0; + act(fs); + break; + case do_transfer: + if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) + break; + out_8(&sw->intr_enable, 0); + out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); + out_8(&sw->select, RELAX); + del_timer(&fs->timeout); + fs->timeout_pending = 0; + dr = fs->dma; + cp = fs->dma_cmd; + if (rq_data_dir(req) == WRITE) + ++cp; + /* + * Check that the main data transfer has finished. + * On writing, the swim3 sometimes doesn't use + * up all the bytes of the postamble, so we can still + * see DMA active here. That doesn't matter as long + * as all the sector data has been transferred. + */ + if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { + /* wait a little while for DMA to complete */ + for (n = 0; n < 100; ++n) { + if (cp->xfer_status != 0) + break; + udelay(1); + barrier(); + } + } + /* turn off DMA */ + out_le32(&dr->control, (RUN | PAUSE) << 16); + stat = le16_to_cpu(cp->xfer_status); + resid = le16_to_cpu(cp->res_count); + if (intr & ERROR_INTR) { + n = fs->scount - 1 - resid / 512; + if (n > 0) { + blk_update_request(req, 0, n << 9); + fs->req_sector += n; + } + if (fs->retries < 5) { + ++fs->retries; + act(fs); + } else { + 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, BLK_STS_IOERR, 0); + fs->state = idle; + } + } else { + if ((stat & ACTIVE) == 0 || resid != 0) { + /* musta been an error */ + 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, BLK_STS_IOERR, 0); + fs->state = idle; + break; + } + 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; + if (++fs->head > 1) { + fs->head = 0; + ++fs->req_cyl; + } + } + act(fs); + } else + fs->state = idle; + } + break; + default: + swim3_err("Don't know what to do in state %d\n", fs->state); + } + spin_unlock_irqrestore(&swim3_lock, flags); + return IRQ_HANDLED; +} + +/* +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; + + swim3_dbg("%s", "-> grab drive\n"); + + spin_lock_irqsave(&swim3_lock, flags); + if (fs->state != idle && fs->state != available) { + ++fs->wanted; + /* this will enable irqs in order to sleep */ + if (!interruptible) + wait_event_lock_irq(fs->wait, + fs->state == available, + swim3_lock); + else if (wait_event_interruptible_lock_irq(fs->wait, + fs->state == available, + swim3_lock)) { + --fs->wanted; + spin_unlock_irqrestore(&swim3_lock, flags); + return -EINTR; + } + --fs->wanted; + } + fs->state = state; + spin_unlock_irqrestore(&swim3_lock, flags); + + return 0; +} + +static void release_drive(struct floppy_state *fs) +{ + struct request_queue *q = disks[fs->index]->queue; + unsigned long flags; + + swim3_dbg("%s", "-> release drive\n"); + + spin_lock_irqsave(&swim3_lock, flags); + fs->state = idle; + spin_unlock_irqrestore(&swim3_lock, flags); + + blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q); +} + +static int fd_eject(struct floppy_state *fs) +{ + int err, n; + + err = grab_drive(fs, ejecting, 1); + if (err) + return err; + swim3_action(fs, EJECT); + for (n = 20; n > 0; --n) { + if (signal_pending(current)) { + err = -EINTR; + break; + } + swim3_select(fs, RELAX); + schedule_timeout_interruptible(1); + if (swim3_readbit(fs, DISK_IN) == 0) + break; + } + swim3_select(fs, RELAX); + udelay(150); + fs->ejected = 1; + release_drive(fs); + return err; +} + +static struct floppy_struct floppy_type = + { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ + +static int floppy_locked_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long param) +{ + struct floppy_state *fs = bdev->bd_disk->private_data; + int err; + + if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (fs->mdev->media_bay && + check_media_bay(fs->mdev->media_bay) != MB_FD) + return -ENXIO; + + switch (cmd) { + case FDEJECT: + if (fs->ref_count != 1) + return -EBUSY; + err = fd_eject(fs); + return err; + case FDGETPRM: + if (copy_to_user((void __user *) param, &floppy_type, + sizeof(struct floppy_struct))) + return -EFAULT; + return 0; + } + return -ENOTTY; +} + +static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long param) +{ + int ret; + + mutex_lock(&swim3_mutex); + ret = floppy_locked_ioctl(bdev, mode, cmd, param); + mutex_unlock(&swim3_mutex); + + return ret; +} + +static int floppy_open(struct gendisk *disk, blk_mode_t mode) +{ + struct floppy_state *fs = disk->private_data; + struct swim3 __iomem *sw = fs->swim3; + int n, err = 0; + + if (fs->ref_count == 0) { + if (fs->mdev->media_bay && + check_media_bay(fs->mdev->media_bay) != MB_FD) + return -ENXIO; + out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); + out_8(&sw->control_bic, 0xff); + out_8(&sw->mode, 0x95); + udelay(10); + out_8(&sw->intr_enable, 0); + out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); + swim3_action(fs, MOTOR_ON); + fs->write_prot = -1; + fs->cur_cyl = -1; + for (n = 0; n < 2 * HZ; ++n) { + if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) + break; + if (signal_pending(current)) { + err = -EINTR; + break; + } + swim3_select(fs, RELAX); + schedule_timeout_interruptible(1); + } + if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 + || swim3_readbit(fs, DISK_IN) == 0)) + err = -ENXIO; + swim3_action(fs, SETMFM); + swim3_select(fs, RELAX); + + } else if (fs->ref_count == -1 || mode & BLK_OPEN_EXCL) + return -EBUSY; + + if (err == 0 && !(mode & BLK_OPEN_NDELAY) && + (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE))) { + if (disk_check_media_change(disk)) + floppy_revalidate(disk); + if (fs->ejected) + err = -ENXIO; + } + + if (err == 0 && (mode & BLK_OPEN_WRITE)) { + if (fs->write_prot < 0) + fs->write_prot = swim3_readbit(fs, WRITE_PROT); + if (fs->write_prot) + err = -EROFS; + } + + if (err) { + if (fs->ref_count == 0) { + swim3_action(fs, MOTOR_OFF); + out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); + swim3_select(fs, RELAX); + } + return err; + } + + if (mode & BLK_OPEN_EXCL) + fs->ref_count = -1; + else + ++fs->ref_count; + + return 0; +} + +static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode) +{ + int ret; + + mutex_lock(&swim3_mutex); + ret = floppy_open(disk, mode); + mutex_unlock(&swim3_mutex); + + return ret; +} + +static void floppy_release(struct gendisk *disk) +{ + 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; + else if (fs->ref_count == -1) + fs->ref_count = 0; + if (fs->ref_count == 0) { + swim3_action(fs, MOTOR_OFF); + out_8(&sw->control_bic, 0xff); + swim3_select(fs, RELAX); + } + mutex_unlock(&swim3_mutex); +} + +static unsigned int floppy_check_events(struct gendisk *disk, + unsigned int clearing) +{ + struct floppy_state *fs = disk->private_data; + return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; +} + +static int floppy_revalidate(struct gendisk *disk) +{ + struct floppy_state *fs = disk->private_data; + struct swim3 __iomem *sw; + int ret, n; + + if (fs->mdev->media_bay && + check_media_bay(fs->mdev->media_bay) != MB_FD) + return -ENXIO; + + sw = fs->swim3; + grab_drive(fs, revalidating, 0); + out_8(&sw->intr_enable, 0); + out_8(&sw->control_bis, DRIVE_ENABLE); + swim3_action(fs, MOTOR_ON); /* necessary? */ + fs->write_prot = -1; + fs->cur_cyl = -1; + mdelay(1); + for (n = HZ; n > 0; --n) { + if (swim3_readbit(fs, SEEK_COMPLETE)) + break; + if (signal_pending(current)) + break; + swim3_select(fs, RELAX); + schedule_timeout_interruptible(1); + } + ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 + || swim3_readbit(fs, DISK_IN) == 0; + if (ret) + swim3_action(fs, MOTOR_OFF); + else { + fs->ejected = 0; + swim3_action(fs, SETMFM); + } + swim3_select(fs, RELAX); + + release_drive(fs); + return ret; +} + +static const struct block_device_operations floppy_fops = { + .open = floppy_unlocked_open, + .release = floppy_release, + .ioctl = floppy_ioctl, + .check_events = floppy_check_events, +}; + +static const struct blk_mq_ops swim3_mq_ops = { + .queue_rq = swim3_queue_rq, +}; + +static void swim3_mb_event(struct macio_dev* mdev, int mb_state) +{ + struct floppy_state *fs = macio_get_drvdata(mdev); + struct swim3 __iomem *sw; + + if (!fs) + return; + + sw = fs->swim3; + + 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; + + fs->mdev = mdev; + fs->index = index; + + /* Check & Request resources */ + if (macio_resource_count(mdev) < 2) { + swim3_err("%s", "No address in device-tree\n"); + return -ENXIO; + } + 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)")) { + swim3_err("%s", "Can't request mmio resource\n"); + return -EBUSY; + } + if (macio_request_resource(mdev, 1, "swim3 (dma)")) { + swim3_err("%s", "Can't request dma resource\n"); + macio_release_resource(mdev, 0); + return -EBUSY; + } + dev_set_drvdata(&mdev->ofdev.dev, fs); + + if (mdev->media_bay == NULL) + pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); + + fs->state = idle; + fs->swim3 = (struct swim3 __iomem *) + ioremap(macio_resource_start(mdev, 0), 0x200); + if (fs->swim3 == NULL) { + 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) { + swim3_err("%s", "Couldn't map dma registers\n"); + iounmap(fs->swim3); + rc = -ENOMEM; + goto out_release; + } + fs->swim3_intr = macio_irq(mdev, 0); + fs->dma_intr = macio_irq(mdev, 1); + fs->cur_cyl = -1; + fs->cur_sector = -1; + fs->secpercyl = 36; + fs->secpertrack = 18; + fs->total_secs = 2880; + 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)); + fs->dma_cmd[1].command = cpu_to_le16(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)) { + swim3_err("%s", "Couldn't request interrupt\n"); + pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); + goto out_unmap; + } + + timer_setup(&fs->timeout, NULL, 0); + + swim3_info("SWIM3 floppy controller %s\n", + mdev->media_bay ? "in media bay" : ""); + + return 0; + + out_unmap: + iounmap(fs->dma); + iounmap(fs->swim3); + + out_release: + macio_release_resource(mdev, 0); + macio_release_resource(mdev, 1); + + return rc; +} + +static int swim3_attach(struct macio_dev *mdev, + const struct of_device_id *match) +{ + struct floppy_state *fs; + struct gendisk *disk; + int rc; + + if (floppy_count >= MAX_FLOPPIES) + return -ENXIO; + + if (floppy_count == 0) { + rc = register_blkdev(FLOPPY_MAJOR, "fd"); + if (rc) + return rc; + } + + fs = &floppy_states[floppy_count]; + memset(fs, 0, sizeof(*fs)); + + rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2, + BLK_MQ_F_SHOULD_MERGE); + if (rc) + goto out_unregister; + + disk = blk_mq_alloc_disk(&fs->tag_set, fs); + if (IS_ERR(disk)) { + rc = PTR_ERR(disk); + goto out_free_tag_set; + } + + rc = swim3_add_device(mdev, floppy_count); + if (rc) + goto out_cleanup_disk; + + disk->major = FLOPPY_MAJOR; + disk->first_minor = floppy_count; + disk->minors = 1; + disk->fops = &floppy_fops; + disk->private_data = fs; + disk->events = DISK_EVENT_MEDIA_CHANGE; + disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; + sprintf(disk->disk_name, "fd%d", floppy_count); + set_capacity(disk, 2880); + rc = add_disk(disk); + if (rc) + goto out_cleanup_disk; + + disks[floppy_count++] = disk; + return 0; + +out_cleanup_disk: + put_disk(disk); +out_free_tag_set: + blk_mq_free_tag_set(&fs->tag_set); +out_unregister: + if (floppy_count == 0) + unregister_blkdev(FLOPPY_MAJOR, "fd"); + return rc; +} + +static const struct of_device_id swim3_match[] = +{ + { + .name = "swim3", + }, + { + .compatible = "ohare-swim3" + }, + { + .compatible = "swim3" + }, + { /* end of list */ } +}; + +static struct macio_driver swim3_driver = +{ + .driver = { + .name = "swim3", + .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, +#endif +}; + + +static int swim3_init(void) +{ + macio_register_driver(&swim3_driver); + return 0; +} + +module_init(swim3_init) + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Paul Mackerras"); +MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); |