m68k: mac - Add SWIM floppy support
Laurent Vivier [Sat, 15 Nov 2008 15:10:10 +0000 (16:10 +0100)]
It allows to read data from a floppy, but not to write to, and to eject the
floppy (useful on our Mac without eject button).

Signed-off-by: Laurent Vivier <Laurent@lvivier.info>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/mac/config.c
arch/m68k/mac/via.c
drivers/block/Kconfig
drivers/block/Makefile
drivers/block/swim.c [new file with mode: 0644]
drivers/block/swim_asm.S [new file with mode: 0644]

index 3a1c0b2..be01798 100644 (file)
@@ -22,6 +22,7 @@
 /* keyb */
 #include <linux/init.h>
 #include <linux/vt_kern.h>
+#include <linux/platform_device.h>
 
 #define BOOTINFO_COMPAT_1_0
 #include <asm/setup.h>
 #include <asm/mac_oss.h>
 #include <asm/mac_psc.h>
 
+/* platform device info */
+
+#define SWIM_IO_SIZE 0x2000    /* SWIM IO resource size */
+
 /* Mac bootinfo struct */
 
 struct mac_booter_data mac_bi_data;
@@ -870,3 +875,42 @@ static void mac_get_model(char *str)
        strcpy(str, "Macintosh ");
        strcat(str, macintosh_config->name);
 }
+
+static struct resource swim_resources[1];
+
+static struct platform_device swim_device = {
+       .name           = "swim",
+       .id             = -1,
+       .num_resources  = ARRAY_SIZE(swim_resources),
+       .resource       = swim_resources,
+};
+
+static struct platform_device *mac_platform_devices[] __initdata = {
+       &swim_device
+};
+
+int __init mac_platform_init(void)
+{
+       u8 *swim_base;
+
+       switch (macintosh_config->floppy_type) {
+       case MAC_FLOPPY_SWIM_ADDR1:
+               swim_base = (u8 *)(VIA1_BASE + 0x1E000);
+               break;
+       case MAC_FLOPPY_SWIM_ADDR2:
+               swim_base = (u8 *)(VIA1_BASE + 0x16000);
+               break;
+       default:
+               return 0;
+       }
+
+       swim_resources[0].name = "swim-regs";
+       swim_resources[0].start = (resource_size_t)swim_base;
+       swim_resources[0].end = (resource_size_t)(swim_base + SWIM_IO_SIZE);
+       swim_resources[0].flags = IORESOURCE_MEM;
+
+       return platform_add_devices(mac_platform_devices,
+                                   ARRAY_SIZE(mac_platform_devices));
+}
+
+arch_initcall(mac_platform_init);
index 7d97ba5..11bce3c 100644 (file)
@@ -645,3 +645,12 @@ int via_irq_pending(int irq)
        }
        return 0;
 }
+
+void via1_set_head(int head)
+{
+       if (head == 0)
+               via1[vBufA] &= ~VIA1A_vHeadSel;
+       else
+               via1[vBufA] |= VIA1A_vHeadSel;
+}
+EXPORT_SYMBOL(via1_set_head);
index 0344a8a..e7b8aa0 100644 (file)
@@ -45,6 +45,13 @@ config MAC_FLOPPY
          If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
          floppy controller, say Y here. Most commonly found in PowerMacs.
 
+config BLK_DEV_SWIM
+       tristate "Support for SWIM Macintosh floppy"
+       depends on M68K && MAC
+       help
+         You should select this option if you want floppy support
+         and you don't have a II, IIfx, Q900, Q950 or AV series.
+
 config AMIGA_Z2RAM
        tristate "Amiga Zorro II ramdisk support"
        depends on ZORRO
index 87e120e..3145141 100644 (file)
@@ -6,6 +6,7 @@
 # 
 
 obj-$(CONFIG_MAC_FLOPPY)       += swim3.o
+obj-$(CONFIG_BLK_DEV_SWIM)     += swim_mod.o
 obj-$(CONFIG_BLK_DEV_FD)       += floppy.o
 obj-$(CONFIG_AMIGA_FLOPPY)     += amiflop.o
 obj-$(CONFIG_PS3_DISK)         += ps3disk.o
@@ -33,3 +34,5 @@ obj-$(CONFIG_BLK_DEV_UB)      += ub.o
 obj-$(CONFIG_BLK_DEV_HD)       += hd.o
 
 obj-$(CONFIG_XEN_BLKDEV_FRONTEND)      += xen-blkfront.o
+
+swim_mod-objs  := swim.o swim_asm.o
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
new file mode 100644 (file)
index 0000000..d22cc38
--- /dev/null
@@ -0,0 +1,995 @@
+/*
+ * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
+ *
+ * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
+ *
+ * based on Alastair Bridgewater SWIM analysis, 2001
+ * based on SWIM3 driver (c) Paul Mackerras, 1996
+ * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
+ *
+ * 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.
+ *
+ * 2004-08-21 (lv) - Initial implementation
+ * 2008-10-30 (lv) - Port to 2.6
+ */
+
+#include <linux/module.h>
+#include <linux/fd.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <asm/macintosh.h>
+#include <asm/mac_via.h>
+
+#define CARDNAME "swim"
+
+struct sector_header {
+       unsigned char side;
+       unsigned char track;
+       unsigned char sector;
+       unsigned char size;
+       unsigned char crc0;
+       unsigned char crc1;
+} __attribute__((packed));
+
+#define DRIVER_VERSION "Version 0.2 (2008-10-30)"
+
+#define REG(x) unsigned char x, x ## _pad[0x200 - 1];
+
+struct swim {
+       REG(write_data)
+       REG(write_mark)
+       REG(write_CRC)
+       REG(write_parameter)
+       REG(write_phase)
+       REG(write_setup)
+       REG(write_mode0)
+       REG(write_mode1)
+
+       REG(read_data)
+       REG(read_mark)
+       REG(read_error)
+       REG(read_parameter)
+       REG(read_phase)
+       REG(read_setup)
+       REG(read_status)
+       REG(read_handshake)
+} __attribute__((packed));
+
+#define swim_write(base, reg, v)       out_8(&(base)->write_##reg, (v))
+#define swim_read(base, reg)           in_8(&(base)->read_##reg)
+
+/* IWM registers */
+
+struct iwm {
+       REG(ph0L)
+       REG(ph0H)
+       REG(ph1L)
+       REG(ph1H)
+       REG(ph2L)
+       REG(ph2H)
+       REG(ph3L)
+       REG(ph3H)
+       REG(mtrOff)
+       REG(mtrOn)
+       REG(intDrive)
+       REG(extDrive)
+       REG(q6L)
+       REG(q6H)
+       REG(q7L)
+       REG(q7H)
+} __attribute__((packed));
+
+#define iwm_write(base, reg, v)        out_8(&(base)->reg, (v))
+#define iwm_read(base, reg)            in_8(&(base)->reg)
+
+/* bits in phase register */
+
+#define SEEK_POSITIVE  0x070
+#define SEEK_NEGATIVE  0x074
+#define STEP           0x071
+#define MOTOR_ON       0x072
+#define MOTOR_OFF      0x076
+#define INDEX          0x073
+#define EJECT          0x077
+#define SETMFM         0x171
+#define SETGCR         0x175
+
+#define RELAX          0x033
+#define LSTRB          0x008
+
+#define CA_MASK                0x077
+
+/* Select values for swim_select and swim_readbit */
+
+#define READ_DATA_0    0x074
+#define TWOMEG_DRIVE   0x075
+#define SINGLE_SIDED   0x076
+#define DRIVE_PRESENT  0x077
+#define DISK_IN                0x170
+#define WRITE_PROT     0x171
+#define TRACK_ZERO     0x172
+#define TACHO          0x173
+#define READ_DATA_1    0x174
+#define MFM_MODE       0x175
+#define SEEK_COMPLETE  0x176
+#define ONEMEG_MEDIA   0x177
+
+/* Bits in handshake register */
+
+#define MARK_BYTE      0x01
+#define CRC_ZERO       0x02
+#define RDDATA         0x04
+#define SENSE          0x08
+#define MOTEN          0x10
+#define ERROR          0x20
+#define DAT2BYTE       0x40
+#define DAT1BYTE       0x80
+
+/* bits in setup register */
+
+#define S_INV_WDATA    0x01
+#define S_3_5_SELECT   0x02
+#define S_GCR          0x04
+#define S_FCLK_DIV2    0x08
+#define S_ERROR_CORR   0x10
+#define S_IBM_DRIVE    0x20
+#define S_GCR_WRITE    0x40
+#define S_TIMEOUT      0x80
+
+/* bits in mode register */
+
+#define CLFIFO         0x01
+#define ENBL1          0x02
+#define ENBL2          0x04
+#define ACTION         0x08
+#define WRITE_MODE     0x10
+#define HEDSEL         0x20
+#define MOTON          0x80
+
+/*----------------------------------------------------------------------------*/
+
+enum drive_location {
+       INTERNAL_DRIVE = 0x02,
+       EXTERNAL_DRIVE = 0x04,
+};
+
+enum media_type {
+       DD_MEDIA,
+       HD_MEDIA,
+};
+
+struct floppy_state {
+
+       /* physical properties */
+
+       enum drive_location location;   /* internal or external drive */
+       int              head_number;   /* single- or double-sided drive */
+
+       /* media */
+
+       int              disk_in;
+       int              ejected;
+       enum media_type  type;
+       int              write_protected;
+
+       int              total_secs;
+       int              secpercyl;
+       int              secpertrack;
+
+       /* in-use information */
+
+       int             track;
+       int             ref_count;
+
+       struct gendisk *disk;
+
+       /* parent controller */
+
+       struct swim_priv *swd;
+};
+
+enum motor_action {
+       OFF,
+       ON,
+};
+
+enum head {
+       LOWER_HEAD = 0,
+       UPPER_HEAD = 1,
+};
+
+#define FD_MAX_UNIT    2
+
+struct swim_priv {
+       struct swim __iomem *base;
+       spinlock_t lock;
+       struct request_queue *queue;
+       int floppy_count;
+       struct floppy_state unit[FD_MAX_UNIT];
+};
+
+extern int swim_read_sector_header(struct swim __iomem *base,
+                                  struct sector_header *header);
+extern int swim_read_sector_data(struct swim __iomem *base,
+                                unsigned char *data);
+
+static inline void set_swim_mode(struct swim __iomem *base, int enable)
+{
+       struct iwm __iomem *iwm_base;
+       unsigned long flags;
+
+       if (!enable) {
+               swim_write(base, mode0, 0xf8);
+               return;
+       }
+
+       iwm_base = (struct iwm __iomem *)base;
+       local_irq_save(flags);
+
+       iwm_read(iwm_base, q7L);
+       iwm_read(iwm_base, mtrOff);
+       iwm_read(iwm_base, q6H);
+
+       iwm_write(iwm_base, q7H, 0x57);
+       iwm_write(iwm_base, q7H, 0x17);
+       iwm_write(iwm_base, q7H, 0x57);
+       iwm_write(iwm_base, q7H, 0x57);
+
+       local_irq_restore(flags);
+}
+
+static inline int get_swim_mode(struct swim __iomem *base)
+{
+       unsigned long flags;
+
+       local_irq_save(flags);
+
+       swim_write(base, phase, 0xf5);
+       if (swim_read(base, phase) != 0xf5)
+               goto is_iwm;
+       swim_write(base, phase, 0xf6);
+       if (swim_read(base, phase) != 0xf6)
+               goto is_iwm;
+       swim_write(base, phase, 0xf7);
+       if (swim_read(base, phase) != 0xf7)
+               goto is_iwm;
+       local_irq_restore(flags);
+       return 1;
+is_iwm:
+       local_irq_restore(flags);
+       return 0;
+}
+
+static inline void swim_select(struct swim __iomem *base, int sel)
+{
+       swim_write(base, phase, RELAX);
+
+       via1_set_head(sel & 0x100);
+
+       swim_write(base, phase, sel & CA_MASK);
+}
+
+static inline void swim_action(struct swim __iomem *base, int action)
+{
+       unsigned long flags;
+
+       local_irq_save(flags);
+
+       swim_select(base, action);
+       udelay(1);
+       swim_write(base, phase, (LSTRB<<4) | LSTRB);
+       udelay(1);
+       swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
+       udelay(1);
+
+       local_irq_restore(flags);
+}
+
+static inline int swim_readbit(struct swim __iomem *base, int bit)
+{
+       int stat;
+
+       swim_select(base, bit);
+
+       udelay(10);
+
+       stat = swim_read(base, handshake);
+
+       return (stat & SENSE) == 0;
+}
+
+static inline void swim_drive(struct swim __iomem *base,
+                             enum drive_location location)
+{
+       if (location == INTERNAL_DRIVE) {
+               swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
+               swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
+       } else if (location == EXTERNAL_DRIVE) {
+               swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
+               swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
+       }
+}
+
+static inline void swim_motor(struct swim __iomem *base,
+                             enum motor_action action)
+{
+       if (action == ON) {
+               int i;
+
+               swim_action(base, MOTOR_ON);
+
+               for (i = 0; i < 2*HZ; i++) {
+                       swim_select(base, RELAX);
+                       if (swim_readbit(base, MOTOR_ON))
+                               break;
+                       current->state = TASK_INTERRUPTIBLE;
+                       schedule_timeout(1);
+               }
+       } else if (action == OFF) {
+               swim_action(base, MOTOR_OFF);
+               swim_select(base, RELAX);
+       }
+}
+
+static inline void swim_eject(struct swim __iomem *base)
+{
+       int i;
+
+       swim_action(base, EJECT);
+
+       for (i = 0; i < 2*HZ; i++) {
+               swim_select(base, RELAX);
+               if (!swim_readbit(base, DISK_IN))
+                       break;
+               current->state = TASK_INTERRUPTIBLE;
+               schedule_timeout(1);
+       }
+       swim_select(base, RELAX);
+}
+
+static inline void swim_head(struct swim __iomem *base, enum head head)
+{
+       /* wait drive is ready */
+
+       if (head == UPPER_HEAD)
+               swim_select(base, READ_DATA_1);
+       else if (head == LOWER_HEAD)
+               swim_select(base, READ_DATA_0);
+}
+
+static inline int swim_step(struct swim __iomem *base)
+{
+       int wait;
+
+       swim_action(base, STEP);
+
+       for (wait = 0; wait < HZ; wait++) {
+
+               current->state = TASK_INTERRUPTIBLE;
+               schedule_timeout(1);
+
+               swim_select(base, RELAX);
+               if (!swim_readbit(base, STEP))
+                       return 0;
+       }
+       return -1;
+}
+
+static inline int swim_track00(struct swim __iomem *base)
+{
+       int try;
+
+       swim_action(base, SEEK_NEGATIVE);
+
+       for (try = 0; try < 100; try++) {
+
+               swim_select(base, RELAX);
+               if (swim_readbit(base, TRACK_ZERO))
+                       break;
+
+               if (swim_step(base))
+                       return -1;
+       }
+
+       if (swim_readbit(base, TRACK_ZERO))
+               return 0;
+
+       return -1;
+}
+
+static inline int swim_seek(struct swim __iomem *base, int step)
+{
+       if (step == 0)
+               return 0;
+
+       if (step < 0) {
+               swim_action(base, SEEK_NEGATIVE);
+               step = -step;
+       } else
+               swim_action(base, SEEK_POSITIVE);
+
+       for ( ; step > 0; step--) {
+               if (swim_step(base))
+                       return -1;
+       }
+
+       return 0;
+}
+
+static inline int swim_track(struct floppy_state *fs,  int track)
+{
+       struct swim __iomem *base = fs->swd->base;
+       int ret;
+
+       ret = swim_seek(base, track - fs->track);
+
+       if (ret == 0)
+               fs->track = track;
+       else {
+               swim_track00(base);
+               fs->track = 0;
+       }
+
+       return ret;
+}
+
+static int floppy_eject(struct floppy_state *fs)
+{
+       struct swim __iomem *base = fs->swd->base;
+
+       swim_drive(base, fs->location);
+       swim_motor(base, OFF);
+       swim_eject(base);
+
+       fs->disk_in = 0;
+       fs->ejected = 1;
+
+       return 0;
+}
+
+static inline int swim_read_sector(struct floppy_state *fs,
+                                  int side, int track,
+                                  int sector, unsigned char *buffer)
+{
+       struct swim __iomem *base = fs->swd->base;
+       unsigned long flags;
+       struct sector_header header;
+       int ret = -1;
+       short i;
+
+       swim_track(fs, track);
+
+       swim_write(base, mode1, MOTON);
+       swim_head(base, side);
+       swim_write(base, mode0, side);
+
+       local_irq_save(flags);
+       for (i = 0; i < 36; i++) {
+               ret = swim_read_sector_header(base, &header);
+               if (!ret && (header.sector == sector)) {
+                       /* found */
+
+                       ret = swim_read_sector_data(base, buffer);
+                       break;
+               }
+       }
+       local_irq_restore(flags);
+
+       swim_write(base, mode0, MOTON);
+
+       if ((header.side != side)  || (header.track != track) ||
+            (header.sector != sector))
+               return 0;
+
+       return ret;
+}
+
+static int floppy_read_sectors(struct floppy_state *fs,
+                              int req_sector, int sectors_nb,
+                              unsigned char *buffer)
+{
+       struct swim __iomem *base = fs->swd->base;
+       int ret;
+       int side, track, sector;
+       int i, try;
+
+
+       swim_drive(base, fs->location);
+       for (i = req_sector; i < req_sector + sectors_nb; i++) {
+               int x;
+               track = i / fs->secpercyl;
+               x = i % fs->secpercyl;
+               side = x / fs->secpertrack;
+               sector = x % fs->secpertrack + 1;
+
+               try = 5;
+               do {
+                       ret = swim_read_sector(fs, side, track, sector,
+                                               buffer);
+                       if (try-- == 0)
+                               return -1;
+               } while (ret != 512);
+
+               buffer += ret;
+       }
+
+       return 0;
+}
+
+static void redo_fd_request(struct request_queue *q)
+{
+       struct request *req;
+       struct floppy_state *fs;
+
+       while ((req = elv_next_request(q))) {
+
+               fs = req->rq_disk->private_data;
+               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->disk_in) {
+                       end_request(req, 0);
+                       continue;
+               }
+               if (rq_data_dir(req) == WRITE) {
+                       if (fs->write_protected) {
+                               end_request(req, 0);
+                               continue;
+                       }
+               }
+               switch (rq_data_dir(req)) {
+               case WRITE:
+                       /* NOT IMPLEMENTED */
+                       end_request(req, 0);
+                       break;
+               case READ:
+                       if (floppy_read_sectors(fs, req->sector,
+                                               req->current_nr_sectors,
+                                               req->buffer)) {
+                               end_request(req, 0);
+                               continue;
+                       }
+                       req->nr_sectors -= req->current_nr_sectors;
+                       req->sector += req->current_nr_sectors;
+                       req->buffer += req->current_nr_sectors * 512;
+                       end_request(req, 1);
+                       break;
+               }
+       }
+}
+
+static void do_fd_request(struct request_queue *q)
+{
+       redo_fd_request(q);
+}
+
+static struct floppy_struct floppy_type[4] = {
+       {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
+       {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
+       { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
+       { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
+};
+
+static int get_floppy_geometry(struct floppy_state *fs, int type,
+                              struct floppy_struct **g)
+{
+       if (type >= ARRAY_SIZE(floppy_type))
+               return -EINVAL;
+
+       if (type)
+               *g = &floppy_type[type];
+       else if (fs->type == HD_MEDIA) /* High-Density media */
+               *g = &floppy_type[3];
+       else if (fs->head_number == 2) /* double-sided */
+               *g = &floppy_type[2];
+       else
+               *g = &floppy_type[1];
+
+       return 0;
+}
+
+static void setup_medium(struct floppy_state *fs)
+{
+       struct swim __iomem *base = fs->swd->base;
+
+       if (swim_readbit(base, DISK_IN)) {
+               struct floppy_struct *g;
+               fs->disk_in = 1;
+               fs->write_protected = swim_readbit(base, WRITE_PROT);
+               fs->type = swim_readbit(base, ONEMEG_MEDIA);
+
+               if (swim_track00(base))
+                       printk(KERN_ERR
+                               "SWIM: cannot move floppy head to track 0\n");
+
+               swim_track00(base);
+
+               get_floppy_geometry(fs, 0, &g);
+               fs->total_secs = g->size;
+               fs->secpercyl = g->head * g->sect;
+               fs->secpertrack = g->sect;
+               fs->track = 0;
+       } else {
+               fs->disk_in = 0;
+       }
+}
+
+static int floppy_open(struct block_device *bdev, fmode_t mode)
+{
+       struct floppy_state *fs = bdev->bd_disk->private_data;
+       struct swim __iomem *base = fs->swd->base;
+       int err;
+
+       if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
+               return -EBUSY;
+
+       if (mode & FMODE_EXCL)
+               fs->ref_count = -1;
+       else
+               fs->ref_count++;
+
+       swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
+       udelay(10);
+       swim_drive(base, INTERNAL_DRIVE);
+       swim_motor(base, ON);
+       swim_action(base, SETMFM);
+       if (fs->ejected)
+               setup_medium(fs);
+       if (!fs->disk_in) {
+               err = -ENXIO;
+               goto out;
+       }
+
+       if (mode & FMODE_NDELAY)
+               return 0;
+
+       if (mode & (FMODE_READ|FMODE_WRITE)) {
+               check_disk_change(bdev);
+               if ((mode & FMODE_WRITE) && fs->write_protected) {
+                       err = -EROFS;
+                       goto out;
+               }
+       }
+       return 0;
+out:
+       if (fs->ref_count < 0)
+               fs->ref_count = 0;
+       else if (fs->ref_count > 0)
+               --fs->ref_count;
+
+       if (fs->ref_count == 0)
+               swim_motor(base, OFF);
+       return err;
+}
+
+static int floppy_release(struct gendisk *disk, fmode_t mode)
+{
+       struct floppy_state *fs = disk->private_data;
+       struct swim __iomem *base = fs->swd->base;
+
+       if (fs->ref_count < 0)
+               fs->ref_count = 0;
+       else if (fs->ref_count > 0)
+               --fs->ref_count;
+
+       if (fs->ref_count == 0)
+               swim_motor(base, OFF);
+
+       return 0;
+}
+
+static int floppy_ioctl(struct block_device *bdev, fmode_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;
+
+       switch (cmd) {
+       case FDEJECT:
+               if (fs->ref_count != 1)
+                       return -EBUSY;
+               err = floppy_eject(fs);
+               return err;
+
+       case FDGETPRM:
+               if (copy_to_user((void __user *) param, (void *) &floppy_type,
+                                sizeof(struct floppy_struct)))
+                       return -EFAULT;
+               break;
+
+       default:
+               printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
+                      cmd);
+               return -ENOSYS;
+       }
+       return 0;
+}
+
+static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+       struct floppy_state *fs = bdev->bd_disk->private_data;
+       struct floppy_struct *g;
+       int ret;
+
+       ret = get_floppy_geometry(fs, 0, &g);
+       if (ret)
+               return ret;
+
+       geo->heads = g->head;
+       geo->sectors = g->sect;
+       geo->cylinders = g->track;
+
+       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 swim __iomem *base = fs->swd->base;
+
+       swim_drive(base, fs->location);
+
+       if (fs->ejected)
+               setup_medium(fs);
+
+       if (!fs->disk_in)
+               swim_motor(base, OFF);
+       else
+               fs->ejected = 0;
+
+       return !fs->disk_in;
+}
+
+static struct block_device_operations floppy_fops = {
+       .owner           = THIS_MODULE,
+       .open            = floppy_open,
+       .release         = floppy_release,
+       .locked_ioctl    = floppy_ioctl,
+       .getgeo          = floppy_getgeo,
+       .media_changed   = floppy_check_change,
+       .revalidate_disk = floppy_revalidate,
+};
+
+static struct kobject *floppy_find(dev_t dev, int *part, void *data)
+{
+       struct swim_priv *swd = data;
+       int drive = (*part & 3);
+
+       if (drive > swd->floppy_count)
+               return NULL;
+
+       *part = 0;
+       return get_disk(swd->unit[drive].disk);
+}
+
+static int __devinit swim_add_floppy(struct swim_priv *swd,
+                                    enum drive_location location)
+{
+       struct floppy_state *fs = &swd->unit[swd->floppy_count];
+       struct swim __iomem *base = swd->base;
+
+       fs->location = location;
+
+       swim_drive(base, location);
+
+       swim_motor(base, OFF);
+
+       if (swim_readbit(base, SINGLE_SIDED))
+               fs->head_number = 1;
+       else
+               fs->head_number = 2;
+       fs->ref_count = 0;
+       fs->ejected = 1;
+
+       swd->floppy_count++;
+
+       return 0;
+}
+
+static int __devinit swim_floppy_init(struct swim_priv *swd)
+{
+       int err;
+       int drive;
+       struct swim __iomem *base = swd->base;
+
+       /* scan floppy drives */
+
+       swim_drive(base, INTERNAL_DRIVE);
+       if (swim_readbit(base, DRIVE_PRESENT))
+               swim_add_floppy(swd, INTERNAL_DRIVE);
+       swim_drive(base, EXTERNAL_DRIVE);
+       if (swim_readbit(base, DRIVE_PRESENT))
+               swim_add_floppy(swd, EXTERNAL_DRIVE);
+
+       /* register floppy drives */
+
+       err = register_blkdev(FLOPPY_MAJOR, "fd");
+       if (err) {
+               printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
+                      FLOPPY_MAJOR);
+               return -EBUSY;
+       }
+
+       for (drive = 0; drive < swd->floppy_count; drive++) {
+               swd->unit[drive].disk = alloc_disk(1);
+               if (swd->unit[drive].disk == NULL) {
+                       err = -ENOMEM;
+                       goto exit_put_disks;
+               }
+               swd->unit[drive].swd = swd;
+       }
+
+       swd->queue = blk_init_queue(do_fd_request, &swd->lock);
+       if (!swd->queue) {
+               err = -ENOMEM;
+               goto exit_put_disks;
+       }
+
+       for (drive = 0; drive < swd->floppy_count; drive++) {
+               swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
+               swd->unit[drive].disk->major = FLOPPY_MAJOR;
+               swd->unit[drive].disk->first_minor = drive;
+               sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
+               swd->unit[drive].disk->fops = &floppy_fops;
+               swd->unit[drive].disk->private_data = &swd->unit[drive];
+               swd->unit[drive].disk->queue = swd->queue;
+               set_capacity(swd->unit[drive].disk, 2880);
+               add_disk(swd->unit[drive].disk);
+       }
+
+       blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
+                           floppy_find, NULL, swd);
+
+       return 0;
+
+exit_put_disks:
+       unregister_blkdev(FLOPPY_MAJOR, "fd");
+       while (drive--)
+               put_disk(swd->unit[drive].disk);
+       return err;
+}
+
+static int __devinit swim_probe(struct platform_device *dev)
+{
+       struct resource *res;
+       struct swim __iomem *swim_base;
+       struct swim_priv *swd;
+       int ret;
+
+       res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
+       if (!res) {
+               ret = -ENODEV;
+               goto out;
+       }
+
+       if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
+               ret = -EBUSY;
+               goto out;
+       }
+
+       swim_base = ioremap(res->start, resource_size(res));
+       if (!swim_base) {
+               return -ENOMEM;
+               goto out_release_io;
+       }
+
+       /* probe device */
+
+       set_swim_mode(swim_base, 1);
+       if (!get_swim_mode(swim_base)) {
+               printk(KERN_INFO "SWIM device not found !\n");
+               ret = -ENODEV;
+               goto out_iounmap;
+       }
+
+       /* set platform driver data */
+
+       swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
+       if (!swd) {
+               ret = -ENOMEM;
+               goto out_iounmap;
+       }
+       platform_set_drvdata(dev, swd);
+
+       swd->base = swim_base;
+
+       ret = swim_floppy_init(swd);
+       if (ret)
+               goto out_kfree;
+
+       return 0;
+
+out_kfree:
+       platform_set_drvdata(dev, NULL);
+       kfree(swd);
+out_iounmap:
+       iounmap(swim_base);
+out_release_io:
+       release_mem_region(res->start, resource_size(res));
+out:
+       return ret;
+}
+
+static int __devexit swim_remove(struct platform_device *dev)
+{
+       struct swim_priv *swd = platform_get_drvdata(dev);
+       int drive;
+       struct resource *res;
+
+       blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
+
+       for (drive = 0; drive < swd->floppy_count; drive++) {
+               del_gendisk(swd->unit[drive].disk);
+               put_disk(swd->unit[drive].disk);
+       }
+
+       unregister_blkdev(FLOPPY_MAJOR, "fd");
+
+       blk_cleanup_queue(swd->queue);
+
+       /* eject floppies */
+
+       for (drive = 0; drive < swd->floppy_count; drive++)
+               floppy_eject(&swd->unit[drive]);
+
+       iounmap(swd->base);
+
+       res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
+       if (res)
+               release_mem_region(res->start, resource_size(res));
+
+       platform_set_drvdata(dev, NULL);
+       kfree(swd);
+
+       return 0;
+}
+
+static struct platform_driver swim_driver = {
+       .probe  = swim_probe,
+       .remove = __devexit_p(swim_remove),
+       .driver   = {
+               .name   = CARDNAME,
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init swim_init(void)
+{
+       printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
+
+       return platform_driver_register(&swim_driver);
+}
+module_init(swim_init);
+
+static void __exit swim_exit(void)
+{
+       platform_driver_unregister(&swim_driver);
+}
+module_exit(swim_exit);
+
+MODULE_DESCRIPTION("Driver for SWIM floppy controller");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
+MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
diff --git a/drivers/block/swim_asm.S b/drivers/block/swim_asm.S
new file mode 100644 (file)
index 0000000..c966820
--- /dev/null
@@ -0,0 +1,247 @@
+/*
+ * low-level functions for the SWIM floppy controller
+ *
+ * needs assembly language because is very timing dependent
+ * this controller exists only on macintosh 680x0 based
+ *
+ * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
+ *
+ * based on Alastair Bridgewater SWIM analysis, 2001
+ * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
+ *
+ * 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.
+ *
+ * 2004-08-21 (lv) - Initial implementation
+ * 2008-11-05 (lv) - add get_swim_mode
+ */
+
+       .equ    write_data,     0x0000
+       .equ    write_mark,     0x0200
+       .equ    write_CRC,      0x0400
+       .equ    write_parameter,0x0600
+       .equ    write_phase,    0x0800
+       .equ    write_setup,    0x0a00
+       .equ    write_mode0,    0x0c00
+       .equ    write_mode1,    0x0e00
+       .equ    read_data,      0x1000
+       .equ    read_mark,      0x1200
+       .equ    read_error,     0x1400
+       .equ    read_parameter, 0x1600
+       .equ    read_phase,     0x1800
+       .equ    read_setup,     0x1a00
+       .equ    read_status,    0x1c00
+       .equ    read_handshake, 0x1e00
+
+       .equ    o_side, 0
+       .equ    o_track, 1
+       .equ    o_sector, 2
+       .equ    o_size, 3
+       .equ    o_crc0, 4
+       .equ    o_crc1, 5
+
+       .equ    seek_time, 30000
+       .equ    max_retry, 40
+       .equ    sector_size, 512
+
+       .global swim_read_sector_header
+swim_read_sector_header:
+       link    %a6, #0
+       moveml  %d1-%d5/%a0-%a4,%sp@-
+       movel   %a6@(0x0c), %a4
+       bsr     mfm_read_addrmark
+       moveml  %sp@+, %d1-%d5/%a0-%a4
+       unlk    %a6
+       rts
+
+sector_address_mark:
+       .byte   0xa1, 0xa1, 0xa1, 0xfe
+sector_data_mark:
+       .byte   0xa1, 0xa1, 0xa1, 0xfb
+
+mfm_read_addrmark:
+       movel   %a6@(0x08), %a3
+       lea     %a3@(read_handshake), %a2
+       lea     %a3@(read_mark), %a3
+       moveq   #-1, %d0
+       movew   #seek_time, %d2
+
+wait_header_init:
+       tstb    %a3@(read_error - read_mark)
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+       moveb   #0x01, %a3@(write_mode1 - read_mark)
+       moveb   #0x01, %a3@(write_mode0 - read_mark)
+       tstb    %a3@(read_error - read_mark)
+       moveb   #0x08, %a3@(write_mode1 - read_mark)
+
+       lea     sector_address_mark, %a0
+       moveq   #3, %d1
+
+wait_addr_mark_byte:
+
+       tstb    %a2@
+       dbmi    %d2, wait_addr_mark_byte
+       bpl     header_exit
+
+       moveb   %a3@, %d3
+       cmpb    %a0@+, %d3
+       dbne    %d1, wait_addr_mark_byte
+       bne     wait_header_init
+
+       moveq   #max_retry, %d2
+
+amark0:        tstb    %a2@
+       dbmi    %d2, amark0
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_track)
+
+       moveq   #max_retry, %d2
+
+amark1:        tstb    %a2@
+       dbmi    %d2, amark1
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_side)
+
+       moveq   #max_retry, %d2
+
+amark2:        tstb    %a2@
+       dbmi    %d2, amark2
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_sector)
+
+       moveq   #max_retry, %d2
+
+amark3:        tstb    %a2@
+       dbmi    %d2, amark3
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_size)
+
+       moveq   #max_retry, %d2
+
+crc0:  tstb    %a2@
+       dbmi    %d2, crc0
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_crc0)
+
+       moveq   #max_retry, %d2
+
+crc1:  tstb    %a2@
+       dbmi    %d2, crc1
+       bpl     signal_nonyb
+
+       moveb   %a3@, %a4@(o_crc1)
+
+       tstb    %a3@(read_error - read_mark)
+
+header_exit:
+       moveq   #0, %d0
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+       rts
+signal_nonyb:
+       moveq   #-1, %d0
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+       rts
+
+       .global swim_read_sector_data
+swim_read_sector_data:
+       link    %a6, #0
+       moveml  %d1-%d5/%a0-%a5,%sp@-
+       movel   %a6@(0x0c), %a4
+       bsr     mfm_read_data
+       moveml  %sp@+, %d1-%d5/%a0-%a5
+       unlk    %a6
+       rts
+
+mfm_read_data:
+       movel   %a6@(0x08), %a3
+       lea     %a3@(read_handshake), %a2
+       lea     %a3@(read_data), %a5
+       lea     %a3@(read_mark), %a3
+       movew   #seek_time, %d2
+
+wait_data_init:
+       tstb    %a3@(read_error - read_mark)
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+       moveb   #0x01, %a3@(write_mode1 - read_mark)
+       moveb   #0x01, %a3@(write_mode0 - read_mark)
+       tstb    %a3@(read_error - read_mark)
+       moveb   #0x08, %a3@(write_mode1 - read_mark)
+
+       lea     sector_data_mark, %a0
+       moveq   #3, %d1
+
+       /* wait data address mark */
+
+wait_data_mark_byte:
+
+       tstb    %a2@
+       dbmi    %d2, wait_data_mark_byte
+       bpl     data_exit
+
+       moveb   %a3@, %d3
+       cmpb    %a0@+, %d3
+       dbne    %d1, wait_data_mark_byte
+       bne     wait_data_init
+
+       /* read data */
+
+       tstb    %a3@(read_error - read_mark)
+
+       movel   #sector_size-1, %d4             /* sector size */
+read_new_data:
+       movew   #max_retry, %d2
+read_data_loop:
+       moveb   %a2@, %d5
+       andb    #0xc0, %d5
+       dbne    %d2, read_data_loop
+       beq     data_exit
+       moveb   %a5@, %a4@+
+       andb    #0x40, %d5
+       dbne    %d4, read_new_data
+       beq     exit_loop
+       moveb   %a5@, %a4@+
+       dbra    %d4, read_new_data
+exit_loop:
+
+       /* read CRC */
+
+       movew   #max_retry, %d2
+data_crc0:
+
+       tstb    %a2@
+       dbmi    %d2, data_crc0
+       bpl     data_exit
+
+       moveb   %a3@, %d5
+
+       moveq   #max_retry, %d2
+
+data_crc1:
+
+       tstb    %a2@
+       dbmi    %d2, data_crc1
+       bpl     data_exit
+
+       moveb   %a3@, %d5
+
+       tstb    %a3@(read_error - read_mark)
+
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+
+       /* return number of bytes read */
+
+       movel   #sector_size, %d0
+       addw    #1, %d4
+       subl    %d4, %d0
+       rts
+data_exit:
+       moveb   #0x18, %a3@(write_mode0 - read_mark)
+       moveq   #-1, %d0
+       rts