diff options
Diffstat (limited to 'drivers/block/swim3.c')
| -rw-r--r-- | drivers/block/swim3.c | 1154 |
1 files changed, 1154 insertions, 0 deletions
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c new file mode 100644 index 000000000000..5b09cf154ac7 --- /dev/null +++ b/drivers/block/swim3.c @@ -0,0 +1,1154 @@ +/* + * Driver for the SWIM3 (Super Woz Integrated Machine 3) + * floppy controller found on Power Macintoshes. + * + * Copyright (C) 1996 Paul Mackerras. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +/* + * TODO: + * handle 2 drives + * handle GCR disks + */ + +#include <linux/config.h> +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/fd.h> +#include <linux/ioctl.h> +#include <linux/blkdev.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <asm/io.h> +#include <asm/dbdma.h> +#include <asm/prom.h> +#include <asm/uaccess.h> +#include <asm/mediabay.h> +#include <asm/machdep.h> +#include <asm/pmac_feature.h> + +static struct request_queue *swim3_queue; +static struct gendisk *disks[2]; +static struct request *fd_req; + +#define MAX_FLOPPIES 2 + +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 TWOMEG_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 MFM_MODE 13 +#define SEEK_COMPLETE 14 +#define ONEMEG_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 device_node* media_bay; /* NULL when not in bay */ + char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; +}; + +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 swim3_select(struct floppy_state *fs, int sel); +static void swim3_action(struct floppy_state *fs, int action); +static int swim3_readbit(struct floppy_state *fs, int bit); +static void do_fd_request(request_queue_t * q); +static void start_request(struct floppy_state *fs); +static void set_timeout(struct floppy_state *fs, int nticks, + void (*proc)(unsigned long)); +static void scan_track(struct floppy_state *fs); +static void seek_track(struct floppy_state *fs, int n); +static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); +static void setup_transfer(struct floppy_state *fs); +static void act(struct floppy_state *fs); +static void scan_timeout(unsigned long data); +static void seek_timeout(unsigned long data); +static void settle_timeout(unsigned long data); +static void xfer_timeout(unsigned long data); +static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs); +/*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/ +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 inode *inode, struct file *filp, + unsigned int cmd, unsigned long param); +static int floppy_open(struct inode *inode, struct file *filp); +static int floppy_release(struct inode *inode, struct file *filp); +static int floppy_check_change(struct gendisk *disk); +static int floppy_revalidate(struct gendisk *disk); +static int swim3_add_device(struct device_node *swims); +int swim3_init(void); + +#ifndef CONFIG_PMAC_PBOOK +#define check_media_bay(which, what) 1 +#endif + +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 void do_fd_request(request_queue_t * q) +{ + int i; + for(i=0;i<floppy_count;i++) + { + if (floppy_states[i].media_bay && + check_media_bay(floppy_states[i].media_bay, MB_FD)) + continue; + start_request(&floppy_states[i]); + } + sti(); +} + +static void start_request(struct floppy_state *fs) +{ + struct request *req; + unsigned long x; + + if (fs->state == idle && fs->wanted) { + fs->state = available; + wake_up(&fs->wait); + return; + } + while (fs->state == idle && (req = elv_next_request(swim3_queue))) { +#if 0 + printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n", + req->rq_disk->disk_name, req->cmd, + (long)req->sector, req->nr_sectors, req->buffer); + printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n", + req->rq_status, req->errors, req->current_nr_sectors); +#endif + + if (req->sector < 0 || req->sector >= fs->total_secs) { + end_request(req, 0); + continue; + } + if (req->current_nr_sectors == 0) { + end_request(req, 1); + continue; + } + if (fs->ejected) { + end_request(req, 0); + continue; + } + + if (rq_data_dir(req) == WRITE) { + if (fs->write_prot < 0) + fs->write_prot = swim3_readbit(fs, WRITE_PROT); + if (fs->write_prot) { + end_request(req, 0); + continue; + } + } + + /* Do not remove the cast. req->sector 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)req->sector) / fs->secpercyl; + x = ((long)req->sector) % fs->secpercyl; + fs->head = x / fs->secpertrack; + fs->req_sector = x % fs->secpertrack + 1; + fd_req = req; + fs->state = do_transfer; + fs->retries = 0; + + act(fs); + } +} + +static void set_timeout(struct floppy_state *fs, int nticks, + void (*proc)(unsigned long)) +{ + unsigned long flags; + + save_flags(flags); cli(); + if (fs->timeout_pending) + del_timer(&fs->timeout); + fs->timeout.expires = jiffies + nticks; + fs->timeout.function = proc; + fs->timeout.data = (unsigned long) fs; + add_timer(&fs->timeout); + fs->timeout_pending = 1; + restore_flags(flags); +} + +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; +} + +static inline void init_dma(struct dbdma_cmd *cp, int cmd, + void *buf, int count) +{ + st_le16(&cp->req_count, count); + st_le16(&cp->command, cmd); + st_le32(&cp->phy_addr, virt_to_bus(buf)); + 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; + + if (fd_req->current_nr_sectors <= 0) { + printk(KERN_ERR "swim3: transfer 0 sectors?\n"); + return; + } + if (rq_data_dir(fd_req) == WRITE) + n = 1; + else { + n = fs->secpertrack - fs->req_sector + 1; + if (n > fd_req->current_nr_sectors) + n = fd_req->current_nr_sectors; + } + 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, virt_to_bus(cp)); + if (rq_data_dir(fd_req) == WRITE) { + /* Set up 3 dma commands: write preamble, data, postamble */ + init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); + ++cp; + init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512); + ++cp; + init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); + } else { + init_dma(cp, INPUT_LAST, fd_req->buffer, 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(fd_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 (;;) { + switch (fs->state) { + case idle: + return; /* XXX shouldn't get here */ + + case locating: + if (swim3_readbit(fs, TRACK_ZERO)) { + 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) { + printk("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) { + end_request(fd_req, 0); + fs->state = idle; + return; + } + fs->state = seeking; + break; + } + setup_transfer(fs); + return; + + case jogging: + seek_track(fs, -5); + return; + + default: + printk(KERN_ERR"swim3: unknown state %d\n", fs->state); + return; + } + } +} + +static void scan_timeout(unsigned long data) +{ + struct floppy_state *fs = (struct floppy_state *) data; + struct swim3 __iomem *sw = fs->swim3; + + 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) { + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); + } else { + fs->state = jogging; + act(fs); + } +} + +static void seek_timeout(unsigned long data) +{ + struct floppy_state *fs = (struct floppy_state *) data; + struct swim3 __iomem *sw = fs->swim3; + + fs->timeout_pending = 0; + out_8(&sw->control_bic, DO_SEEK); + out_8(&sw->select, RELAX); + out_8(&sw->intr_enable, 0); + printk(KERN_ERR "swim3: seek timeout\n"); + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); +} + +static void settle_timeout(unsigned long data) +{ + struct floppy_state *fs = (struct floppy_state *) data; + struct swim3 __iomem *sw = fs->swim3; + + fs->timeout_pending = 0; + if (swim3_readbit(fs, SEEK_COMPLETE)) { + out_8(&sw->select, RELAX); + fs->state = locating; + act(fs); + return; + } + out_8(&sw->select, RELAX); + if (fs->settle_time < 2*HZ) { + ++fs->settle_time; + set_timeout(fs, 1, settle_timeout); + return; + } + printk(KERN_ERR "swim3: seek settle timeout\n"); + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); +} + +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; + struct dbdma_cmd *cp = fs->dma_cmd; + unsigned long s; + int n; + + 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); + if (rq_data_dir(fd_req) == WRITE) + ++cp; + if (ld_le16(&cp->xfer_status) != 0) + s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9); + else + s = 0; + fd_req->sector += s; + fd_req->current_nr_sectors -= s; + printk(KERN_ERR "swim3: timeout %sing sector %ld\n", + (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector); + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); +} + +static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + 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; + + 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=%lx, intr=%x, err=%x\n", + fs->state, rq_data_dir(fd_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) { + printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); + fs->cur_cyl = -1; + if (fs->retries > 5) { + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); + } 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) + printk(KERN_ERR "swim3: 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(fd_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 = ld_le16(&cp->xfer_status); + resid = ld_le16(&cp->res_count); + if (intr & ERROR_INTR) { + n = fs->scount - 1 - resid / 512; + if (n > 0) { + fd_req->sector += n; + fd_req->current_nr_sectors -= n; + fd_req->buffer += n * 512; + 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)fd_req->sector, err); + end_request(fd_req, 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=%lx, intr=%x, err=%x\n", + fs->state, rq_data_dir(fd_req), intr, err); + end_request(fd_req, 0); + fs->state = idle; + start_request(fs); + break; + } + fd_req->sector += fs->scount; + fd_req->current_nr_sectors -= fs->scount; + fd_req->buffer += fs->scount * 512; + if (fd_req->current_nr_sectors <= 0) { + end_request(fd_req, 1); + fs->state = idle; + } else { + 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); + } + } + if (fs->state == idle) + start_request(fs); + break; + default: + printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); + } + return IRQ_HANDLED; +} + +/* +static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ +} +*/ + +static int grab_drive(struct floppy_state *fs, enum swim_state state, + int interruptible) +{ + unsigned long flags; + + save_flags(flags); + cli(); + if (fs->state != idle) { + ++fs->wanted; + while (fs->state != available) { + if (interruptible && signal_pending(current)) { + --fs->wanted; + restore_flags(flags); + return -EINTR; + } + interruptible_sleep_on(&fs->wait); + } + --fs->wanted; + } + fs->state = state; + restore_flags(flags); + return 0; +} + +static void release_drive(struct floppy_state *fs) +{ + unsigned long flags; + + save_flags(flags); + cli(); + fs->state = idle; + start_request(fs); + restore_flags(flags); +} + +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); + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(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_ioctl(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long param) +{ + struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; + int err; + + if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (fs->media_bay && check_media_bay(fs->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_open(struct inode *inode, struct file *filp) +{ + struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; + struct swim3 __iomem *sw = fs->swim3; + int n, err = 0; + + if (fs->ref_count == 0) { + if (fs->media_bay && check_media_bay(fs->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); + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(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 || filp->f_flags & O_EXCL) + return -EBUSY; + + if (err == 0 && (filp->f_flags & O_NDELAY) == 0 + && (filp->f_mode & 3)) { + check_disk_change(inode->i_bdev); + if (fs->ejected) + err = -ENXIO; + } + + if (err == 0 && (filp->f_mode & 2)) { + 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 (filp->f_flags & O_EXCL) + fs->ref_count = -1; + else + ++fs->ref_count; + + return 0; +} + +static int floppy_release(struct inode *inode, struct file *filp) +{ + struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; + struct swim3 __iomem *sw = fs->swim3; + if (fs->ref_count > 0 && --fs->ref_count == 0) { + swim3_action(fs, MOTOR_OFF); + out_8(&sw->control_bic, 0xff); + swim3_select(fs, RELAX); + } + return 0; +} + +static int floppy_check_change(struct gendisk *disk) +{ + struct floppy_state *fs = disk->private_data; + return fs->ejected; +} + +static int floppy_revalidate(struct gendisk *disk) +{ + struct floppy_state *fs = disk->private_data; + struct swim3 __iomem *sw; + int ret, n; + + if (fs->media_bay && check_media_bay(fs->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); + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(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 struct block_device_operations floppy_fops = { + .open = floppy_open, + .release = floppy_release, + .ioctl = floppy_ioctl, + .media_changed = floppy_check_change, + .revalidate_disk= floppy_revalidate, +}; + +int swim3_init(void) +{ + struct device_node *swim; + int err = -ENOMEM; + int i; + + devfs_mk_dir("floppy"); + + swim = find_devices("floppy"); + while (swim && (floppy_count < MAX_FLOPPIES)) + { + swim3_add_device(swim); + swim = swim->next; + } + + swim = find_devices("swim3"); + while (swim && (floppy_count < MAX_FLOPPIES)) + { + swim3_add_device(swim); + swim = swim->next; + } + + if (!floppy_count) + return -ENODEV; + + for (i = 0; i < floppy_count; i++) { + disks[i] = alloc_disk(1); + if (!disks[i]) + goto out; + } + + if (register_blkdev(FLOPPY_MAJOR, "fd")) { + err = -EBUSY; + goto out; + } + + swim3_queue = blk_init_queue(do_fd_request, &swim3_lock); + if (!swim3_queue) { + err = -ENOMEM; + goto out_queue; + } + + for (i = 0; i < floppy_count; i++) { + struct gendisk *disk = disks[i]; + disk->major = FLOPPY_MAJOR; + disk->first_minor = i; + disk->fops = &floppy_fops; + disk->private_data = &floppy_states[i]; + disk->queue = swim3_queue; + disk->flags |= GENHD_FL_REMOVABLE; + sprintf(disk->disk_name, "fd%d", i); + sprintf(disk->devfs_name, "floppy/%d", i); + set_capacity(disk, 2880); + add_disk(disk); + } + return 0; + +out_queue: + unregister_blkdev(FLOPPY_MAJOR, "fd"); +out: + while (i--) + put_disk(disks[i]); + /* shouldn't we do something with results of swim_add_device()? */ + return err; +} + +static int swim3_add_device(struct device_node *swim) +{ + struct device_node *mediabay; + struct floppy_state *fs = &floppy_states[floppy_count]; + + if (swim->n_addrs < 2) + { + printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n", + swim->n_addrs, swim->n_intrs); + return -EINVAL; + } + + if (swim->n_intrs < 2) + { + printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n", + swim->n_addrs, swim->n_intrs); + return -EINVAL; + } + + if (!request_OF_resource(swim, 0, NULL)) { + printk(KERN_INFO "swim3: can't request IO resource !\n"); + return -EINVAL; + } + + mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL; + if (mediabay == NULL) + pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); + + memset(fs, 0, sizeof(*fs)); + fs->state = idle; + fs->swim3 = (struct swim3 __iomem *) + ioremap(swim->addrs[0].address, 0x200); + fs->dma = (struct dbdma_regs __iomem *) + ioremap(swim->addrs[1].address, 0x200); + fs->swim3_intr = swim->intrs[0].line; + fs->dma_intr = swim->intrs[1].line; + fs->cur_cyl = -1; + fs->cur_sector = -1; + fs->secpercyl = 36; + fs->secpertrack = 18; + fs->total_secs = 2880; + fs->media_bay = mediabay; + 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 (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { + printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr); + pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); + 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); + pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); + return -EBUSY; + } +*/ + + init_timer(&fs->timeout); + + printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count, + mediabay ? "in media bay" : ""); + + floppy_count++; + + return 0; +} + +module_init(swim3_init) + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Paul Mackerras"); +MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); |