swim3.c
资源名称:block.rar [点击查看]
上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:29k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- * 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 "xd5xaax00"
- #define GCR_DATA_MARK "xd5xaax0b"
- #define GCR_SLIP_BYTE "x27xaa"
- #define GCR_SELF_SYNC "x3fxbfx1ex34x3cx3f"
- #define DATA_99 "x99x99"
- #define MFM_ADDR_MARK "x99xa1x99xa1x99xa1x99xfe"
- #define MFM_INDEX_MARK "x99xc2x99xc2x99xc2x99xfc"
- #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_MEDIABAY
- #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++)
- {
- #ifdef CONFIG_PMAC_MEDIABAY
- if (floppy_states[i].media_bay &&
- check_media_bay(floppy_states[i].media_bay, MB_FD))
- continue;
- #endif /* CONFIG_PMAC_MEDIABAY */
- 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=%pn",
- req->rq_disk->disk_name, req->cmd,
- (long)req->sector, req->nr_sectors, req->buffer);
- printk(" rq_status=%d errors=%d current_nr_sectors=%ldn",
- 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 0n");
- 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 %dn", 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 timeoutn");
- 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 timeoutn");
- 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 %ldn",
- (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=%xn",
- 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 %dn",
- 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=%dn", stat, resid);
- printk(KERN_ERR " state=%d, dir=%lx, intr=%x, err=%xn",
- 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 %dn", 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);
- 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_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;
- #ifdef CONFIG_PMAC_MEDIABAY
- if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
- return -ENXIO;
- #endif
- 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) {
- #ifdef CONFIG_PMAC_MEDIABAY
- if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
- return -ENXIO;
- #endif
- 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 || 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;
- #ifdef CONFIG_PMAC_MEDIABAY
- if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
- return -ENXIO;
- #endif
- 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 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 SWIM3n", 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 %sn", 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);