| /* |
| * linux/amiga/amiflop.c |
| * |
| * Copyright (C) 1993 Greg Harp |
| * Portions of this driver are based on code contributed by Brad Pepers |
| * |
| * revised 28.5.95 by Joerg Dorchain |
| * - now no bugs(?) any more for both HD & DD |
| * - added support for 40 Track 5.25" drives, 80-track hopefully behaves |
| * like 3.5" dd (no way to test - are there any 5.25" drives out there |
| * that work on an A4000?) |
| * - wrote formatting routine (maybe dirty, but works) |
| * |
| * june/july 1995 added ms-dos support by Joerg Dorchain |
| * (portions based on messydos.device and various contributors) |
| * - currently only 9 and 18 sector disks |
| * |
| * - fixed a bug with the internal trackbuffer when using multiple |
| * disks the same time |
| * - made formatting a bit safer |
| * - added command line and machine based default for "silent" df0 |
| * |
| * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain |
| * - works but I think it's inefficient. (look in redo_fd_request) |
| * But the changes were very efficient. (only three and a half lines) |
| * |
| * january 1996 added special ioctl for tracking down read/write problems |
| * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data |
| * is copied to area. (area should be large enough since no checking is |
| * done - 30K is currently sufficient). return the actual size of the |
| * trackbuffer |
| * - replaced udelays() by a timer (CIAA timer B) for the waits |
| * needed for the disk mechanic. |
| * |
| * february 1996 fixed error recovery and multiple disk access |
| * - both got broken the first time I tampered with the driver :-( |
| * - still not safe, but better than before |
| * |
| * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel. |
| * - Minor changes to accept the kdev_t. |
| * - Replaced some more udelays with ms_delays. Udelay is just a loop, |
| * and so the delay will be different depending on the given |
| * processor :-( |
| * - The driver could use a major cleanup because of the new |
| * major/minor handling that came with kdev_t. It seems to work for |
| * the time being, but I can't guarantee that it will stay like |
| * that when we start using 16 (24?) bit minors. |
| * |
| * restructured jan 1997 by Joerg Dorchain |
| * - Fixed Bug accessing multiple disks |
| * - some code cleanup |
| * - added trackbuffer for each drive to speed things up |
| * - fixed some race conditions (who finds the next may send it to me ;-) |
| */ |
| |
| #include <linux/module.h> |
| |
| #include <linux/fd.h> |
| #include <linux/hdreg.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/amifdreg.h> |
| #include <linux/amifd.h> |
| #include <linux/buffer_head.h> |
| #include <linux/blkdev.h> |
| #include <linux/elevator.h> |
| #include <linux/interrupt.h> |
| |
| #include <asm/setup.h> |
| #include <asm/uaccess.h> |
| #include <asm/amigahw.h> |
| #include <asm/amigaints.h> |
| #include <asm/irq.h> |
| |
| #undef DEBUG /* print _LOTS_ of infos */ |
| |
| #define RAW_IOCTL |
| #ifdef RAW_IOCTL |
| #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ |
| #endif |
| |
| /* |
| * Defines |
| */ |
| |
| /* |
| * Error codes |
| */ |
| #define FD_OK 0 /* operation succeeded */ |
| #define FD_ERROR -1 /* general error (seek, read, write, etc) */ |
| #define FD_NOUNIT 1 /* unit does not exist */ |
| #define FD_UNITBUSY 2 /* unit already active */ |
| #define FD_NOTACTIVE 3 /* unit is not active */ |
| #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ |
| |
| #define MFM_NOSYNC 1 |
| #define MFM_HEADER 2 |
| #define MFM_DATA 3 |
| #define MFM_TRACK 4 |
| |
| /* |
| * Floppy ID values |
| */ |
| #define FD_NODRIVE 0x00000000 /* response when no unit is present */ |
| #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ |
| #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ |
| #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ |
| |
| static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ |
| |
| module_param(fd_def_df0, ulong, 0); |
| MODULE_LICENSE("GPL"); |
| |
| static struct request_queue *floppy_queue; |
| #define QUEUE (floppy_queue) |
| #define CURRENT elv_next_request(floppy_queue) |
| |
| /* |
| * Macros |
| */ |
| #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) |
| #define MOTOR_OFF (ciab.prb |= DSKMOTOR) |
| #define SELECT(mask) (ciab.prb &= ~mask) |
| #define DESELECT(mask) (ciab.prb |= mask) |
| #define SELMASK(drive) (1 << (3 + (drive & 3))) |
| |
| static struct fd_drive_type drive_types[] = { |
| /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ |
| /* warning: times are now in milliseconds (ms) */ |
| { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, |
| { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, |
| { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, |
| { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} |
| }; |
| static int num_dr_types = ARRAY_SIZE(drive_types); |
| |
| static int amiga_read(int), dos_read(int); |
| static void amiga_write(int), dos_write(int); |
| static struct fd_data_type data_types[] = { |
| { "Amiga", 11 , amiga_read, amiga_write}, |
| { "MS-Dos", 9, dos_read, dos_write} |
| }; |
| |
| /* current info on each unit */ |
| static struct amiga_floppy_struct unit[FD_MAX_UNITS]; |
| |
| static struct timer_list flush_track_timer[FD_MAX_UNITS]; |
| static struct timer_list post_write_timer; |
| static struct timer_list motor_on_timer; |
| static struct timer_list motor_off_timer[FD_MAX_UNITS]; |
| static int on_attempts; |
| |
| /* Synchronization of FDC access */ |
| /* request loop (trackbuffer) */ |
| static volatile int fdc_busy = -1; |
| static volatile int fdc_nested; |
| static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); |
| |
| static DECLARE_COMPLETION(motor_on_completion); |
| |
| static volatile int selected = -1; /* currently selected drive */ |
| |
| static int writepending; |
| static int writefromint; |
| static char *raw_buf; |
| |
| static DEFINE_SPINLOCK(amiflop_lock); |
| |
| #define RAW_BUF_SIZE 30000 /* size of raw disk data */ |
| |
| /* |
| * These are global variables, as that's the easiest way to give |
| * information to interrupts. They are the data used for the current |
| * request. |
| */ |
| static volatile char block_flag; |
| static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); |
| |
| /* MS-Dos MFM Coding tables (should go quick and easy) */ |
| static unsigned char mfmencode[16]={ |
| 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, |
| 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 |
| }; |
| static unsigned char mfmdecode[128]; |
| |
| /* floppy internal millisecond timer stuff */ |
| static DECLARE_COMPLETION(ms_wait_completion); |
| #define MS_TICKS ((amiga_eclock+50)/1000) |
| |
| /* |
| * Note that MAX_ERRORS=X doesn't imply that we retry every bad read |
| * max X times - some types of errors increase the errorcount by 2 or |
| * even 3, so we might actually retry only X/2 times before giving up. |
| */ |
| #define MAX_ERRORS 12 |
| |
| #define custom amiga_custom |
| |
| /* Prevent "aliased" accesses. */ |
| static int fd_ref[4] = { 0,0,0,0 }; |
| static int fd_device[4] = { 0, 0, 0, 0 }; |
| |
| /* |
| * Here come the actual hardware access and helper functions. |
| * They are not reentrant and single threaded because all drives |
| * share the same hardware and the same trackbuffer. |
| */ |
| |
| /* Milliseconds timer */ |
| |
| static irqreturn_t ms_isr(int irq, void *dummy) |
| { |
| complete(&ms_wait_completion); |
| return IRQ_HANDLED; |
| } |
| |
| /* all waits are queued up |
| A more generic routine would do a schedule a la timer.device */ |
| static void ms_delay(int ms) |
| { |
| int ticks; |
| static DEFINE_MUTEX(mutex); |
| |
| if (ms > 0) { |
| mutex_lock(&mutex); |
| ticks = MS_TICKS*ms-1; |
| ciaa.tblo=ticks%256; |
| ciaa.tbhi=ticks/256; |
| ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ |
| wait_for_completion(&ms_wait_completion); |
| mutex_unlock(&mutex); |
| } |
| } |
| |
| /* Hardware semaphore */ |
| |
| /* returns true when we would get the semaphore */ |
| static inline int try_fdc(int drive) |
| { |
| drive &= 3; |
| return ((fdc_busy < 0) || (fdc_busy == drive)); |
| } |
| |
| static void get_fdc(int drive) |
| { |
| unsigned long flags; |
| |
| drive &= 3; |
| #ifdef DEBUG |
| printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); |
| #endif |
| local_irq_save(flags); |
| wait_event(fdc_wait, try_fdc(drive)); |
| fdc_busy = drive; |
| fdc_nested++; |
| local_irq_restore(flags); |
| } |
| |
| static inline void rel_fdc(void) |
| { |
| #ifdef DEBUG |
| if (fdc_nested == 0) |
| printk("fd: unmatched rel_fdc\n"); |
| printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); |
| #endif |
| fdc_nested--; |
| if (fdc_nested == 0) { |
| fdc_busy = -1; |
| wake_up(&fdc_wait); |
| } |
| } |
| |
| static void fd_select (int drive) |
| { |
| unsigned char prb = ~0; |
| |
| drive&=3; |
| #ifdef DEBUG |
| printk("selecting %d\n",drive); |
| #endif |
| if (drive == selected) |
| return; |
| get_fdc(drive); |
| selected = drive; |
| |
| if (unit[drive].track % 2 != 0) |
| prb &= ~DSKSIDE; |
| if (unit[drive].motor == 1) |
| prb &= ~DSKMOTOR; |
| ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
| ciab.prb = prb; |
| prb &= ~SELMASK(drive); |
| ciab.prb = prb; |
| rel_fdc(); |
| } |
| |
| static void fd_deselect (int drive) |
| { |
| unsigned char prb; |
| unsigned long flags; |
| |
| drive&=3; |
| #ifdef DEBUG |
| printk("deselecting %d\n",drive); |
| #endif |
| if (drive != selected) { |
| printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); |
| return; |
| } |
| |
| get_fdc(drive); |
| local_irq_save(flags); |
| |
| selected = -1; |
| |
| prb = ciab.prb; |
| prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
| ciab.prb = prb; |
| |
| local_irq_restore (flags); |
| rel_fdc(); |
| |
| } |
| |
| static void motor_on_callback(unsigned long nr) |
| { |
| if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { |
| complete_all(&motor_on_completion); |
| } else { |
| motor_on_timer.expires = jiffies + HZ/10; |
| add_timer(&motor_on_timer); |
| } |
| } |
| |
| static int fd_motor_on(int nr) |
| { |
| nr &= 3; |
| |
| del_timer(motor_off_timer + nr); |
| |
| if (!unit[nr].motor) { |
| unit[nr].motor = 1; |
| fd_select(nr); |
| |
| INIT_COMPLETION(motor_on_completion); |
| motor_on_timer.data = nr; |
| mod_timer(&motor_on_timer, jiffies + HZ/2); |
| |
| on_attempts = 10; |
| wait_for_completion(&motor_on_completion); |
| fd_deselect(nr); |
| } |
| |
| if (on_attempts == 0) { |
| on_attempts = -1; |
| #if 0 |
| printk (KERN_ERR "motor_on failed, turning motor off\n"); |
| fd_motor_off (nr); |
| return 0; |
| #else |
| printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); |
| #endif |
| } |
| |
| return 1; |
| } |
| |
| static void fd_motor_off(unsigned long drive) |
| { |
| long calledfromint; |
| #ifdef MODULE |
| long decusecount; |
| |
| decusecount = drive & 0x40000000; |
| #endif |
| calledfromint = drive & 0x80000000; |
| drive&=3; |
| if (calledfromint && !try_fdc(drive)) { |
| /* We would be blocked in an interrupt, so try again later */ |
| motor_off_timer[drive].expires = jiffies + 1; |
| add_timer(motor_off_timer + drive); |
| return; |
| } |
| unit[drive].motor = 0; |
| fd_select(drive); |
| udelay (1); |
| fd_deselect(drive); |
| } |
| |
| static void floppy_off (unsigned int nr) |
| { |
| int drive; |
| |
| drive = nr & 3; |
| /* called this way it is always from interrupt */ |
| motor_off_timer[drive].data = nr | 0x80000000; |
| mod_timer(motor_off_timer + drive, jiffies + 3*HZ); |
| } |
| |
| static int fd_calibrate(int drive) |
| { |
| unsigned char prb; |
| int n; |
| |
| drive &= 3; |
| get_fdc(drive); |
| if (!fd_motor_on (drive)) |
| return 0; |
| fd_select (drive); |
| prb = ciab.prb; |
| prb |= DSKSIDE; |
| prb &= ~DSKDIREC; |
| ciab.prb = prb; |
| for (n = unit[drive].type->tracks/2; n != 0; --n) { |
| if (ciaa.pra & DSKTRACK0) |
| break; |
| prb &= ~DSKSTEP; |
| ciab.prb = prb; |
| prb |= DSKSTEP; |
| udelay (2); |
| ciab.prb = prb; |
| ms_delay(unit[drive].type->step_delay); |
| } |
| ms_delay (unit[drive].type->settle_time); |
| prb |= DSKDIREC; |
| n = unit[drive].type->tracks + 20; |
| for (;;) { |
| prb &= ~DSKSTEP; |
| ciab.prb = prb; |
| prb |= DSKSTEP; |
| udelay (2); |
| ciab.prb = prb; |
| ms_delay(unit[drive].type->step_delay + 1); |
| if ((ciaa.pra & DSKTRACK0) == 0) |
| break; |
| if (--n == 0) { |
| printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); |
| fd_motor_off (drive); |
| unit[drive].track = -1; |
| rel_fdc(); |
| return 0; |
| } |
| } |
| unit[drive].track = 0; |
| ms_delay(unit[drive].type->settle_time); |
| |
| rel_fdc(); |
| fd_deselect(drive); |
| return 1; |
| } |
| |
| static int fd_seek(int drive, int track) |
| { |
| unsigned char prb; |
| int cnt; |
| |
| #ifdef DEBUG |
| printk("seeking drive %d to track %d\n",drive,track); |
| #endif |
| drive &= 3; |
| get_fdc(drive); |
| if (unit[drive].track == track) { |
| rel_fdc(); |
| return 1; |
| } |
| if (!fd_motor_on(drive)) { |
| rel_fdc(); |
| return 0; |
| } |
| if (unit[drive].track < 0 && !fd_calibrate(drive)) { |
| rel_fdc(); |
| return 0; |
| } |
| |
| fd_select (drive); |
| cnt = unit[drive].track/2 - track/2; |
| prb = ciab.prb; |
| prb |= DSKSIDE | DSKDIREC; |
| if (track % 2 != 0) |
| prb &= ~DSKSIDE; |
| if (cnt < 0) { |
| cnt = - cnt; |
| prb &= ~DSKDIREC; |
| } |
| ciab.prb = prb; |
| if (track % 2 != unit[drive].track % 2) |
| ms_delay (unit[drive].type->side_time); |
| unit[drive].track = track; |
| if (cnt == 0) { |
| rel_fdc(); |
| fd_deselect(drive); |
| return 1; |
| } |
| do { |
| prb &= ~DSKSTEP; |
| ciab.prb = prb; |
| prb |= DSKSTEP; |
| udelay (1); |
| ciab.prb = prb; |
| ms_delay (unit[drive].type->step_delay); |
| } while (--cnt != 0); |
| ms_delay (unit[drive].type->settle_time); |
| |
| rel_fdc(); |
| fd_deselect(drive); |
| return 1; |
| } |
| |
| static unsigned long fd_get_drive_id(int drive) |
| { |
| int i; |
| ulong id = 0; |
| |
| drive&=3; |
| get_fdc(drive); |
| /* set up for ID */ |
| MOTOR_ON; |
| udelay(2); |
| SELECT(SELMASK(drive)); |
| udelay(2); |
| DESELECT(SELMASK(drive)); |
| udelay(2); |
| MOTOR_OFF; |
| udelay(2); |
| SELECT(SELMASK(drive)); |
| udelay(2); |
| DESELECT(SELMASK(drive)); |
| udelay(2); |
| |
| /* loop and read disk ID */ |
| for (i=0; i<32; i++) { |
| SELECT(SELMASK(drive)); |
| udelay(2); |
| |
| /* read and store value of DSKRDY */ |
| id <<= 1; |
| id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ |
| |
| DESELECT(SELMASK(drive)); |
| } |
| |
| rel_fdc(); |
| |
| /* |
| * RB: At least A500/A2000's df0: don't identify themselves. |
| * As every (real) Amiga has at least a 3.5" DD drive as df0: |
| * we default to that if df0: doesn't identify as a certain |
| * type. |
| */ |
| if(drive == 0 && id == FD_NODRIVE) |
| { |
| id = fd_def_df0; |
| printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); |
| } |
| /* return the ID value */ |
| return (id); |
| } |
| |
| static irqreturn_t fd_block_done(int irq, void *dummy) |
| { |
| if (block_flag) |
| custom.dsklen = 0x4000; |
| |
| if (block_flag == 2) { /* writing */ |
| writepending = 2; |
| post_write_timer.expires = jiffies + 1; /* at least 2 ms */ |
| post_write_timer.data = selected; |
| add_timer(&post_write_timer); |
| } |
| else { /* reading */ |
| block_flag = 0; |
| wake_up (&wait_fd_block); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| static void raw_read(int drive) |
| { |
| drive&=3; |
| get_fdc(drive); |
| wait_event(wait_fd_block, !block_flag); |
| fd_select(drive); |
| /* setup adkcon bits correctly */ |
| custom.adkcon = ADK_MSBSYNC; |
| custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; |
| |
| custom.dsksync = MFM_SYNC; |
| |
| custom.dsklen = 0; |
| custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
| custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
| custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
| |
| block_flag = 1; |
| |
| wait_event(wait_fd_block, !block_flag); |
| |
| custom.dsklen = 0; |
| fd_deselect(drive); |
| rel_fdc(); |
| } |
| |
| static int raw_write(int drive) |
| { |
| ushort adk; |
| |
| drive&=3; |
| get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ |
| if ((ciaa.pra & DSKPROT) == 0) { |
| rel_fdc(); |
| return 0; |
| } |
| wait_event(wait_fd_block, !block_flag); |
| fd_select(drive); |
| /* clear adkcon bits */ |
| custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; |
| /* set appropriate adkcon bits */ |
| adk = ADK_SETCLR|ADK_FAST; |
| if ((ulong)unit[drive].track >= unit[drive].type->precomp2) |
| adk |= ADK_PRECOMP1; |
| else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) |
| adk |= ADK_PRECOMP0; |
| custom.adkcon = adk; |
| |
| custom.dsklen = DSKLEN_WRITE; |
| custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
| custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
| custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
| |
| block_flag = 2; |
| return 1; |
| } |
| |
| /* |
| * to be called at least 2ms after the write has finished but before any |
| * other access to the hardware. |
| */ |
| static void post_write (unsigned long drive) |
| { |
| #ifdef DEBUG |
| printk("post_write for drive %ld\n",drive); |
| #endif |
| drive &= 3; |
| custom.dsklen = 0; |
| block_flag = 0; |
| writepending = 0; |
| writefromint = 0; |
| unit[drive].dirty = 0; |
| wake_up(&wait_fd_block); |
| fd_deselect(drive); |
| rel_fdc(); /* corresponds to get_fdc() in raw_write */ |
| } |
| |
| |
| /* |
| * The following functions are to convert the block contents into raw data |
| * written to disk and vice versa. |
| * (Add other formats here ;-)) |
| */ |
| |
| static unsigned long scan_sync(unsigned long raw, unsigned long end) |
| { |
| ushort *ptr = (ushort *)raw, *endp = (ushort *)end; |
| |
| while (ptr < endp && *ptr++ != 0x4489) |
| ; |
| if (ptr < endp) { |
| while (*ptr == 0x4489 && ptr < endp) |
| ptr++; |
| return (ulong)ptr; |
| } |
| return 0; |
| } |
| |
| static inline unsigned long checksum(unsigned long *addr, int len) |
| { |
| unsigned long csum = 0; |
| |
| len /= sizeof(*addr); |
| while (len-- > 0) |
| csum ^= *addr++; |
| csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); |
| |
| return csum; |
| } |
| |
| static unsigned long decode (unsigned long *data, unsigned long *raw, |
| int len) |
| { |
| ulong *odd, *even; |
| |
| /* convert length from bytes to longwords */ |
| len >>= 2; |
| odd = raw; |
| even = odd + len; |
| |
| /* prepare return pointer */ |
| raw += len * 2; |
| |
| do { |
| *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); |
| } while (--len != 0); |
| |
| return (ulong)raw; |
| } |
| |
| struct header { |
| unsigned char magic; |
| unsigned char track; |
| unsigned char sect; |
| unsigned char ord; |
| unsigned char labels[16]; |
| unsigned long hdrchk; |
| unsigned long datachk; |
| }; |
| |
| static int amiga_read(int drive) |
| { |
| unsigned long raw; |
| unsigned long end; |
| int scnt; |
| unsigned long csum; |
| struct header hdr; |
| |
| drive&=3; |
| raw = (long) raw_buf; |
| end = raw + unit[drive].type->read_size; |
| |
| for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
| if (!(raw = scan_sync(raw, end))) { |
| printk (KERN_INFO "can't find sync for sector %d\n", scnt); |
| return MFM_NOSYNC; |
| } |
| |
| raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); |
| raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); |
| raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); |
| raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); |
| csum = checksum((ulong *)&hdr, |
| (char *)&hdr.hdrchk-(char *)&hdr); |
| |
| #ifdef DEBUG |
| printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", |
| hdr.magic, hdr.track, hdr.sect, hdr.ord, |
| *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], |
| *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], |
| hdr.hdrchk, hdr.datachk); |
| #endif |
| |
| if (hdr.hdrchk != csum) { |
| printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); |
| return MFM_HEADER; |
| } |
| |
| /* verify track */ |
| if (hdr.track != unit[drive].track) { |
| printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); |
| return MFM_TRACK; |
| } |
| |
| raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), |
| (ulong *)raw, 512); |
| csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); |
| |
| if (hdr.datachk != csum) { |
| printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", |
| hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, |
| hdr.datachk, csum); |
| printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", |
| ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], |
| ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], |
| ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], |
| ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); |
| return MFM_DATA; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void encode(unsigned long data, unsigned long *dest) |
| { |
| unsigned long data2; |
| |
| data &= 0x55555555; |
| data2 = data ^ 0x55555555; |
| data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); |
| |
| if (*(dest - 1) & 0x00000001) |
| data &= 0x7FFFFFFF; |
| |
| *dest = data; |
| } |
| |
| static void encode_block(unsigned long *dest, unsigned long *src, int len) |
| { |
| int cnt, to_cnt = 0; |
| unsigned long data; |
| |
| /* odd bits */ |
| for (cnt = 0; cnt < len / 4; cnt++) { |
| data = src[cnt] >> 1; |
| encode(data, dest + to_cnt++); |
| } |
| |
| /* even bits */ |
| for (cnt = 0; cnt < len / 4; cnt++) { |
| data = src[cnt]; |
| encode(data, dest + to_cnt++); |
| } |
| } |
| |
| static unsigned long *putsec(int disk, unsigned long *raw, int cnt) |
| { |
| struct header hdr; |
| int i; |
| |
| disk&=3; |
| *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; |
| raw++; |
| *raw++ = 0x44894489; |
| |
| hdr.magic = 0xFF; |
| hdr.track = unit[disk].track; |
| hdr.sect = cnt; |
| hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; |
| for (i = 0; i < 16; i++) |
| hdr.labels[i] = 0; |
| hdr.hdrchk = checksum((ulong *)&hdr, |
| (char *)&hdr.hdrchk-(char *)&hdr); |
| hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); |
| |
| encode_block(raw, (ulong *)&hdr.magic, 4); |
| raw += 2; |
| encode_block(raw, (ulong *)&hdr.labels, 16); |
| raw += 8; |
| encode_block(raw, (ulong *)&hdr.hdrchk, 4); |
| raw += 2; |
| encode_block(raw, (ulong *)&hdr.datachk, 4); |
| raw += 2; |
| encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); |
| raw += 256; |
| |
| return raw; |
| } |
| |
| static void amiga_write(int disk) |
| { |
| unsigned int cnt; |
| unsigned long *ptr = (unsigned long *)raw_buf; |
| |
| disk&=3; |
| /* gap space */ |
| for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) |
| *ptr++ = 0xaaaaaaaa; |
| |
| /* sectors */ |
| for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
| ptr = putsec (disk, ptr, cnt); |
| *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; |
| } |
| |
| |
| struct dos_header { |
| unsigned char track, /* 0-80 */ |
| side, /* 0-1 */ |
| sec, /* 0-...*/ |
| len_desc;/* 2 */ |
| unsigned short crc; /* on 68000 we got an alignment problem, |
| but this compiler solves it by adding silently |
| adding a pad byte so data won't fit |
| and this took about 3h to discover.... */ |
| unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ |
| }; |
| |
| /* crc routines are borrowed from the messydos-handler */ |
| |
| /* excerpt from the messydos-device |
| ; The CRC is computed not only over the actual data, but including |
| ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). |
| ; As we don't read or encode these fields into our buffers, we have to |
| ; preload the registers containing the CRC with the values they would have |
| ; after stepping over these fields. |
| ; |
| ; How CRCs "really" work: |
| ; |
| ; First, you should regard a bitstring as a series of coefficients of |
| ; polynomials. We calculate with these polynomials in modulo-2 |
| ; arithmetic, in which both add and subtract are done the same as |
| ; exclusive-or. Now, we modify our data (a very long polynomial) in |
| ; such a way that it becomes divisible by the CCITT-standard 16-bit |
| ; 16 12 5 |
| ; polynomial: x + x + x + 1, represented by $11021. The easiest |
| ; way to do this would be to multiply (using proper arithmetic) our |
| ; datablock with $11021. So we have: |
| ; data * $11021 = |
| ; data * ($10000 + $1021) = |
| ; data * $10000 + data * $1021 |
| ; The left part of this is simple: Just add two 0 bytes. But then |
| ; the right part (data $1021) remains difficult and even could have |
| ; a carry into the left part. The solution is to use a modified |
| ; multiplication, which has a result that is not correct, but with |
| ; a difference of any multiple of $11021. We then only need to keep |
| ; the 16 least significant bits of the result. |
| ; |
| ; The following algorithm does this for us: |
| ; |
| ; unsigned char *data, c, crclo, crchi; |
| ; while (not done) { |
| ; c = *data++ + crchi; |
| ; crchi = (@ c) >> 8 + crclo; |
| ; crclo = @ c; |
| ; } |
| ; |
| ; Remember, + is done with EOR, the @ operator is in two tables (high |
| ; and low byte separately), which is calculated as |
| ; |
| ; $1021 * (c & $F0) |
| ; xor $1021 * (c & $0F) |
| ; xor $1021 * (c >> 4) (* is regular multiplication) |
| ; |
| ; |
| ; Anyway, the end result is the same as the remainder of the division of |
| ; the data by $11021. I am afraid I need to study theory a bit more... |
| |
| |
| my only works was to code this from manx to C.... |
| |
| */ |
| |
| static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) |
| { |
| static unsigned char CRCTable1[] = { |
| 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, |
| 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, |
| 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, |
| 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, |
| 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, |
| 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, |
| 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, |
| 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, |
| 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, |
| 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, |
| 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, |
| 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, |
| 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, |
| 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, |
| 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, |
| 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e |
| }; |
| |
| static unsigned char CRCTable2[] = { |
| 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, |
| 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, |
| 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, |
| 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, |
| 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, |
| 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, |
| 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, |
| 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, |
| 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, |
| 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, |
| 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, |
| 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, |
| 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, |
| 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, |
| 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, |
| 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 |
| }; |
| |
| /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ |
| register int i; |
| register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; |
| |
| CRCT1=CRCTable1; |
| CRCT2=CRCTable2; |
| data=data_a3; |
| crcl=data_d1; |
| crch=data_d0; |
| for (i=data_d3; i>=0; i--) { |
| c = (*data++) ^ crch; |
| crch = CRCT1[c] ^ crcl; |
| crcl = CRCT2[c]; |
| } |
| return (crch<<8)|crcl; |
| } |
| |
| static inline ushort dos_hdr_crc (struct dos_header *hdr) |
| { |
| return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ |
| } |
| |
| static inline ushort dos_data_crc(unsigned char *data) |
| { |
| return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ |
| } |
| |
| static inline unsigned char dos_decode_byte(ushort word) |
| { |
| register ushort w2; |
| register unsigned char byte; |
| register unsigned char *dec = mfmdecode; |
| |
| w2=word; |
| w2>>=8; |
| w2&=127; |
| byte = dec[w2]; |
| byte <<= 4; |
| w2 = word & 127; |
| byte |= dec[w2]; |
| return byte; |
| } |
| |
| static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) |
| *data++=dos_decode_byte(*raw++); |
| return ((ulong)raw); |
| } |
| |
| #ifdef DEBUG |
| static void dbg(unsigned long ptr) |
| { |
| printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, |
| ((ulong *)ptr)[0], ((ulong *)ptr)[1], |
| ((ulong *)ptr)[2], ((ulong *)ptr)[3]); |
| } |
| #endif |
| |
| static int dos_read(int drive) |
| { |
| unsigned long end; |
| unsigned long raw; |
| int scnt; |
| unsigned short crc,data_crc[2]; |
| struct dos_header hdr; |
| |
| drive&=3; |
| raw = (long) raw_buf; |
| end = raw + unit[drive].type->read_size; |
| |
| for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
| do { /* search for the right sync of each sec-hdr */ |
| if (!(raw = scan_sync (raw, end))) { |
| printk(KERN_INFO "dos_read: no hdr sync on " |
| "track %d, unit %d for sector %d\n", |
| unit[drive].track,drive,scnt); |
| return MFM_NOSYNC; |
| } |
| #ifdef DEBUG |
| dbg(raw); |
| #endif |
| } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ |
| raw+=2; /* skip over headermark */ |
| raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); |
| crc = dos_hdr_crc(&hdr); |
| |
| #ifdef DEBUG |
| printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, |
| hdr.sec, hdr.len_desc, hdr.crc); |
| #endif |
| |
| if (crc != hdr.crc) { |
| printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", |
| hdr.crc, crc); |
| return MFM_HEADER; |
| } |
| if (hdr.track != unit[drive].track/unit[drive].type->heads) { |
| printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", |
| hdr.track, |
| unit[drive].track/unit[drive].type->heads); |
| return MFM_TRACK; |
| } |
| |
| if (hdr.side != unit[drive].track%unit[drive].type->heads) { |
| printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", |
| hdr.side, |
| unit[drive].track%unit[drive].type->heads); |
| return MFM_TRACK; |
| } |
| |
| if (hdr.len_desc != 2) { |
| printk(KERN_INFO "dos_read: unknown sector len " |
| "descriptor %d\n", hdr.len_desc); |
| return MFM_DATA; |
| } |
| #ifdef DEBUG |
| printk("hdr accepted\n"); |
| #endif |
| if (!(raw = scan_sync (raw, end))) { |
| printk(KERN_INFO "dos_read: no data sync on track " |
| "%d, unit %d for sector%d, disk sector %d\n", |
| unit[drive].track, drive, scnt, hdr.sec); |
| return MFM_NOSYNC; |
| } |
| #ifdef DEBUG |
| dbg(raw); |
| #endif |
| |
| if (*((ushort *)raw)!=0x5545) { |
| printk(KERN_INFO "dos_read: no data mark after " |
| "sync (%d,%d,%d,%d) sc=%d\n", |
| hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); |
| return MFM_NOSYNC; |
| } |
| |
| raw+=2; /* skip data mark (included in checksum) */ |
| raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); |
| raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); |
| crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); |
| |
| if (crc != data_crc[0]) { |
| printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " |
| "sc=%d, %x %x\n", hdr.track, hdr.side, |
| hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); |
| printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", |
| ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], |
| ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], |
| ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], |
| ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); |
| return MFM_DATA; |
| } |
| } |
| return 0; |
| } |
| |
| static inline ushort dos_encode_byte(unsigned char byte) |
| { |
| register unsigned char *enc, b2, b1; |
| register ushort word; |
| |
| enc=mfmencode; |
| b1=byte; |
| b2=b1>>4; |
| b1&=15; |
| word=enc[b2] <<8 | enc [b1]; |
| return (word|((word&(256|64)) ? 0: 128)); |
| } |
| |
| static void dos_encode_block(ushort *dest, unsigned char *src, int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) { |
| *dest=dos_encode_byte(*src++); |
| *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; |
| dest++; |
| } |
| } |
| |
| static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) |
| { |
| static struct dos_header hdr={0,0,0,2,0, |
| {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; |
| int i; |
| static ushort crc[2]={0,0x4e4e}; |
| |
| drive&=3; |
| /* id gap 1 */ |
| /* the MFM word before is always 9254 */ |
| for(i=0;i<6;i++) |
| *raw++=0xaaaaaaaa; |
| /* 3 sync + 1 headermark */ |
| *raw++=0x44894489; |
| *raw++=0x44895554; |
| |
| /* fill in the variable parts of the header */ |
| hdr.track=unit[drive].track/unit[drive].type->heads; |
| hdr.side=unit[drive].track%unit[drive].type->heads; |
| hdr.sec=cnt+1; |
| hdr.crc=dos_hdr_crc(&hdr); |
| |
| /* header (without "magic") and id gap 2*/ |
| dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); |
| raw+=14; |
| |
| /*id gap 3 */ |
| for(i=0;i<6;i++) |
| *raw++=0xaaaaaaaa; |
| |
| /* 3 syncs and 1 datamark */ |
| *raw++=0x44894489; |
| *raw++=0x44895545; |
| |
| /* data */ |
| dos_encode_block((ushort *)raw, |
| (unsigned char *)unit[drive].trackbuf+cnt*512,512); |
| raw+=256; |
| |
| /*data crc + jd's special gap (long words :-/) */ |
| crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); |
| dos_encode_block((ushort *) raw,(unsigned char *)crc,4); |
| raw+=2; |
| |
| /* data gap */ |
| for(i=0;i<38;i++) |
| *raw++=0x92549254; |
| |
| return raw; /* wrote 652 MFM words */ |
| } |
| |
| static void dos_write(int disk) |
| { |
| int cnt; |
| unsigned long raw = (unsigned long) raw_buf; |
| unsigned long *ptr=(unsigned long *)raw; |
| |
| disk&=3; |
| /* really gap4 + indexgap , but we write it first and round it up */ |
| for (cnt=0;cnt<425;cnt++) |
| *ptr++=0x92549254; |
| |
| /* the following is just guessed */ |
| if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ |
| for(cnt=0;cnt<473;cnt++) |
| *ptr++=0x92549254; |
| |
| /* now the index marks...*/ |
| for (cnt=0;cnt<20;cnt++) |
| *ptr++=0x92549254; |
| for (cnt=0;cnt<6;cnt++) |
| *ptr++=0xaaaaaaaa; |
| *ptr++=0x52245224; |
| *ptr++=0x52245552; |
| for (cnt=0;cnt<20;cnt++) |
| *ptr++=0x92549254; |
| |
| /* sectors */ |
| for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
| ptr=ms_putsec(disk,ptr,cnt); |
| |
| *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ |
| } |
| |
| /* |
| * Here comes the high level stuff (i.e. the filesystem interface) |
| * and helper functions. |
| * Normally this should be the only part that has to be adapted to |
| * different kernel versions. |
| */ |
| |
| /* FIXME: this assumes the drive is still spinning - |
| * which is only true if we complete writing a track within three seconds |
| */ |
| static void flush_track_callback(unsigned long nr) |
| { |
| nr&=3; |
| writefromint = 1; |
| if (!try_fdc(nr)) { |
| /* we might block in an interrupt, so try again later */ |
| flush_track_timer[nr].expires = jiffies + 1; |
| add_timer(flush_track_timer + nr); |
| return; |
| } |
| get_fdc(nr); |
| (*unit[nr].dtype->write_fkt)(nr); |
| if (!raw_write(nr)) { |
| printk (KERN_NOTICE "floppy disk write protected\n"); |
| writefromint = 0; |
| writepending = 0; |
| } |
| rel_fdc(); |
| } |
| |
| static int non_int_flush_track (unsigned long nr) |
| { |
| unsigned long flags; |
| |
| nr&=3; |
| writefromint = 0; |
| del_timer(&post_write_timer); |
| get_fdc(nr); |
| if (!fd_motor_on(nr)) { |
| writepending = 0; |
| rel_fdc(); |
| return 0; |
| } |
| local_irq_save(flags); |
| if (writepending != 2) { |
| local_irq_restore(flags); |
| (*unit[nr].dtype->write_fkt)(nr); |
| if (!raw_write(nr)) { |
| printk (KERN_NOTICE "floppy disk write protected " |
| "in write!\n"); |
| writepending = 0; |
| return 0; |
| } |
| wait_event(wait_fd_block, block_flag != 2); |
| } |
| else { |
| local_irq_restore(flags); |
| ms_delay(2); /* 2 ms post_write delay */ |
| post_write(nr); |
| } |
| rel_fdc(); |
| return 1; |
| } |
| |
| static int get_track(int drive, int track) |
| { |
| int error, errcnt; |
| |
| drive&=3; |
| if (unit[drive].track == track) |
| return 0; |
| get_fdc(drive); |
| if (!fd_motor_on(drive)) { |
| rel_fdc(); |
| return -1; |
| } |
| |
| if (unit[drive].dirty == 1) { |
| del_timer (flush_track_timer + drive); |
| non_int_flush_track (drive); |
| } |
| errcnt = 0; |
| while (errcnt < MAX_ERRORS) { |
| if (!fd_seek(drive, track)) |
| return -1; |
| raw_read(drive); |
| error = (*unit[drive].dtype->read_fkt)(drive); |
| if (error == 0) { |
| rel_fdc(); |
| return 0; |
| } |
| /* Read Error Handling: recalibrate and try again */ |
| unit[drive].track = -1; |
| errcnt++; |
| } |
| rel_fdc(); |
| return -1; |
| } |
| |
| static void redo_fd_request(void) |
| { |
| unsigned int cnt, block, track, sector; |
| int drive; |
| struct amiga_floppy_struct *floppy; |
| char *data; |
| unsigned long flags; |
| |
| repeat: |
| if (!CURRENT) { |
| /* Nothing left to do */ |
| return; |
| } |
| |
| floppy = CURRENT->rq_disk->private_data; |
| drive = floppy - unit; |
| |
| /* Here someone could investigate to be more efficient */ |
| for (cnt = 0; cnt < blk_rq_cur_sectors(CURRENT); cnt++) { |
| #ifdef DEBUG |
| printk("fd: sector %ld + %d requested for %s\n", |
| blk_rq_pos(CURRENT), cnt, |
| (rq_data_dir(CURRENT) == READ) ? "read" : "write"); |
| #endif |
| block = blk_rq_pos(CURRENT) + cnt; |
| if ((int)block > floppy->blocks) { |
| __blk_end_request_cur(CURRENT, -EIO); |
| goto repeat; |
| } |
| |
| track = block / (floppy->dtype->sects * floppy->type->sect_mult); |
| sector = block % (floppy->dtype->sects * floppy->type->sect_mult); |
| data = CURRENT->buffer + 512 * cnt; |
| #ifdef DEBUG |
| printk("access to track %d, sector %d, with buffer at " |
| "0x%08lx\n", track, sector, data); |
| #endif |
| |
| if (get_track(drive, track) == -1) { |
| __blk_end_request_cur(CURRENT, -EIO); |
| goto repeat; |
| } |
| |
| switch (rq_data_dir(CURRENT)) { |
| case READ: |
| memcpy(data, floppy->trackbuf + sector * 512, 512); |
| break; |
| |
| case WRITE: |
| memcpy(floppy->trackbuf + sector * 512, data, 512); |
| |
| /* keep the drive spinning while writes are scheduled */ |
| if (!fd_motor_on(drive)) { |
| __blk_end_request_cur(CURRENT, -EIO); |
| goto repeat; |
| } |
| /* |
| * setup a callback to write the track buffer |
| * after a short (1 tick) delay. |
| */ |
| local_irq_save(flags); |
| |
| floppy->dirty = 1; |
| /* reset the timer */ |
| mod_timer (flush_track_timer + drive, jiffies + 1); |
| local_irq_restore(flags); |
| break; |
| } |
| } |
| |
| __blk_end_request_cur(CURRENT, 0); |
| goto repeat; |
| } |
| |
| static void do_fd_request(struct request_queue * q) |
| { |
| redo_fd_request(); |
| } |
| |
| static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| int drive = MINOR(bdev->bd_dev) & 3; |
| |
| geo->heads = unit[drive].type->heads; |
| geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; |
| geo->cylinders = unit[drive].type->tracks; |
| return 0; |
| } |
| |
| static int fd_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long param) |
| { |
| struct amiga_floppy_struct *p = bdev->bd_disk->private_data; |
| int drive = p - unit; |
| static struct floppy_struct getprm; |
| void __user *argp = (void __user *)param; |
| |
| switch(cmd){ |
| case FDFMTBEG: |
| get_fdc(drive); |
| if (fd_ref[drive] > 1) { |
| rel_fdc(); |
| return -EBUSY; |
| } |
| fsync_bdev(bdev); |
| if (fd_motor_on(drive) == 0) { |
| rel_fdc(); |
| return -ENODEV; |
| } |
| if (fd_calibrate(drive) == 0) { |
| rel_fdc(); |
| return -ENXIO; |
| } |
| floppy_off(drive); |
| rel_fdc(); |
| break; |
| case FDFMTTRK: |
| if (param < p->type->tracks * p->type->heads) |
| { |
| get_fdc(drive); |
| if (fd_seek(drive,param) != 0){ |
| memset(p->trackbuf, FD_FILL_BYTE, |
| p->dtype->sects * p->type->sect_mult * 512); |
| non_int_flush_track(drive); |
| } |
| floppy_off(drive); |
| rel_fdc(); |
| } |
| else |
| return -EINVAL; |
| break; |
| case FDFMTEND: |
| floppy_off(drive); |
| invalidate_bdev(bdev); |
| break; |
| case FDGETPRM: |
| memset((void *)&getprm, 0, sizeof (getprm)); |
| getprm.track=p->type->tracks; |
| getprm.head=p->type->heads; |
| getprm.sect=p->dtype->sects * p->type->sect_mult; |
| getprm.size=p->blocks; |
| if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) |
| return -EFAULT; |
| break; |
| case FDSETPRM: |
| case FDDEFPRM: |
| return -EINVAL; |
| case FDFLUSH: /* unconditionally, even if not needed */ |
| del_timer (flush_track_timer + drive); |
| non_int_flush_track(drive); |
| break; |
| #ifdef RAW_IOCTL |
| case IOCTL_RAW_TRACK: |
| if (copy_to_user(argp, raw_buf, p->type->read_size)) |
| return -EFAULT; |
| else |
| return p->type->read_size; |
| #endif |
| default: |
| printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", |
| cmd, drive); |
| return -ENOSYS; |
| } |
| return 0; |
| } |
| |
| static void fd_probe(int dev) |
| { |
| unsigned long code; |
| int type; |
| int drive; |
| |
| drive = dev & 3; |
| code = fd_get_drive_id(drive); |
| |
| /* get drive type */ |
| for (type = 0; type < num_dr_types; type++) |
| if (drive_types[type].code == code) |
| break; |
| |
| if (type >= num_dr_types) { |
| printk(KERN_WARNING "fd_probe: unsupported drive type " |
| "%08lx found\n", code); |
| unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ |
| return; |
| } |
| |
| unit[drive].type = drive_types + type; |
| unit[drive].track = -1; |
| |
| unit[drive].disk = -1; |
| unit[drive].motor = 0; |
| unit[drive].busy = 0; |
| unit[drive].status = -1; |
| } |
| |
| /* |
| * floppy_open check for aliasing (/dev/fd0 can be the same as |
| * /dev/PS0 etc), and disallows simultaneous access to the same |
| * drive with different device numbers. |
| */ |
| static int floppy_open(struct block_device *bdev, fmode_t mode) |
| { |
| int drive = MINOR(bdev->bd_dev) & 3; |
| int system = (MINOR(bdev->bd_dev) & 4) >> 2; |
| int old_dev; |
| unsigned long flags; |
| |
| old_dev = fd_device[drive]; |
| |
| if (fd_ref[drive] && old_dev != system) |
| return -EBUSY; |
| |
| if (mode & (FMODE_READ|FMODE_WRITE)) { |
| check_disk_change(bdev); |
| if (mode & FMODE_WRITE) { |
| int wrprot; |
| |
| get_fdc(drive); |
| fd_select (drive); |
| wrprot = !(ciaa.pra & DSKPROT); |
| fd_deselect (drive); |
| rel_fdc(); |
| |
| if (wrprot) |
| return -EROFS; |
| } |
| } |
| |
| local_irq_save(flags); |
| fd_ref[drive]++; |
| fd_device[drive] = system; |
| local_irq_restore(flags); |
| |
| unit[drive].dtype=&data_types[system]; |
| unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* |
| data_types[system].sects*unit[drive].type->sect_mult; |
| set_capacity(unit[drive].gendisk, unit[drive].blocks); |
| |
| printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, |
| unit[drive].type->name, data_types[system].name); |
| |
| return 0; |
| } |
| |
| static int floppy_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct amiga_floppy_struct *p = disk->private_data; |
| int drive = p - unit; |
| |
| if (unit[drive].dirty == 1) { |
| del_timer (flush_track_timer + drive); |
| non_int_flush_track (drive); |
| } |
| |
| if (!fd_ref[drive]--) { |
| printk(KERN_CRIT "floppy_release with fd_ref == 0"); |
| fd_ref[drive] = 0; |
| } |
| #ifdef MODULE |
| /* the mod_use counter is handled this way */ |
| floppy_off (drive | 0x40000000); |
| #endif |
| return 0; |
| } |
| |
| /* |
| * floppy-change is never called from an interrupt, so we can relax a bit |
| * here, sleep etc. Note that floppy-on tries to set current_DOR to point |
| * to the desired drive, but it will probably not survive the sleep if |
| * several floppies are used at the same time: thus the loop. |
| */ |
| static int amiga_floppy_change(struct gendisk *disk) |
| { |
| struct amiga_floppy_struct *p = disk->private_data; |
| int drive = p - unit; |
| int changed; |
| static int first_time = 1; |
| |
| if (first_time) |
| changed = first_time--; |
| else { |
| get_fdc(drive); |
| fd_select (drive); |
| changed = !(ciaa.pra & DSKCHANGE); |
| fd_deselect (drive); |
| rel_fdc(); |
| } |
| |
| if (changed) { |
| fd_probe(drive); |
| p->track = -1; |
| p->dirty = 0; |
| writepending = 0; /* if this was true before, too bad! */ |
| writefromint = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static struct block_device_operations floppy_fops = { |
| .owner = THIS_MODULE, |
| .open = floppy_open, |
| .release = floppy_release, |
| .locked_ioctl = fd_ioctl, |
| .getgeo = fd_getgeo, |
| .media_changed = amiga_floppy_change, |
| }; |
| |
| static int __init fd_probe_drives(void) |
| { |
| int drive,drives,nomem; |
| |
| printk(KERN_INFO "FD: probing units\n" KERN_INFO "found "); |
| drives=0; |
| nomem=0; |
| for(drive=0;drive<FD_MAX_UNITS;drive++) { |
| struct gendisk *disk; |
| fd_probe(drive); |
| if (unit[drive].type->code == FD_NODRIVE) |
| continue; |
| disk = alloc_disk(1); |
| if (!disk) { |
| unit[drive].type->code = FD_NODRIVE; |
| continue; |
| } |
| unit[drive].gendisk = disk; |
| drives++; |
| if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { |
| printk("no mem for "); |
| unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ |
| drives--; |
| nomem = 1; |
| } |
| printk("fd%d ",drive); |
| disk->major = FLOPPY_MAJOR; |
| disk->first_minor = drive; |
| disk->fops = &floppy_fops; |
| sprintf(disk->disk_name, "fd%d", drive); |
| disk->private_data = &unit[drive]; |
| disk->queue = floppy_queue; |
| set_capacity(disk, 880*2); |
| add_disk(disk); |
| } |
| if ((drives > 0) || (nomem == 0)) { |
| if (drives == 0) |
| printk("no drives"); |
| printk("\n"); |
| return drives; |
| } |
| printk("\n"); |
| return -ENOMEM; |
| } |
| |
| static struct kobject *floppy_find(dev_t dev, int *part, void *data) |
| { |
| int drive = *part & 3; |
| if (unit[drive].type->code == FD_NODRIVE) |
| return NULL; |
| *part = 0; |
| return get_disk(unit[drive].gendisk); |
| } |
| |
| static int __init amiga_floppy_init(void) |
| { |
| int i, ret; |
| |
| if (!MACH_IS_AMIGA) |
| return -ENODEV; |
| |
| if (!AMIGAHW_PRESENT(AMI_FLOPPY)) |
| return -ENODEV; |
| |
| if (register_blkdev(FLOPPY_MAJOR,"fd")) |
| return -EBUSY; |
| |
| /* |
| * We request DSKPTR, DSKLEN and DSKDATA only, because the other |
| * floppy registers are too spreaded over the custom register space |
| */ |
| ret = -EBUSY; |
| if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) { |
| printk("fd: cannot get floppy registers\n"); |
| goto out_blkdev; |
| } |
| |
| ret = -ENOMEM; |
| if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) == |
| NULL) { |
| printk("fd: cannot get chip mem buffer\n"); |
| goto out_memregion; |
| } |
| |
| ret = -EBUSY; |
| if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { |
| printk("fd: cannot get irq for dma\n"); |
| goto out_irq; |
| } |
| |
| if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { |
| printk("fd: cannot get irq for timer\n"); |
| goto out_irq2; |
| } |
| |
| ret = -ENOMEM; |
| floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock); |
| if (!floppy_queue) |
| goto out_queue; |
| |
| ret = -ENODEV; |
| if (fd_probe_drives() < 1) /* No usable drives */ |
| goto out_probe; |
| |
| blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, |
| floppy_find, NULL, NULL); |
| |
| /* initialize variables */ |
| init_timer(&motor_on_timer); |
| motor_on_timer.expires = 0; |
| motor_on_timer.data = 0; |
| motor_on_timer.function = motor_on_callback; |
| for (i = 0; i < FD_MAX_UNITS; i++) { |
| init_timer(&motor_off_timer[i]); |
| motor_off_timer[i].expires = 0; |
| motor_off_timer[i].data = i|0x80000000; |
| motor_off_timer[i].function = fd_motor_off; |
| init_timer(&flush_track_timer[i]); |
| flush_track_timer[i].expires = 0; |
| flush_track_timer[i].data = i; |
| flush_track_timer[i].function = flush_track_callback; |
| |
| unit[i].track = -1; |
| } |
| |
| init_timer(&post_write_timer); |
| post_write_timer.expires = 0; |
| post_write_timer.data = 0; |
| post_write_timer.function = post_write; |
| |
| for (i = 0; i < 128; i++) |
| mfmdecode[i]=255; |
| for (i = 0; i < 16; i++) |
| mfmdecode[mfmencode[i]]=i; |
| |
| /* make sure that disk DMA is enabled */ |
| custom.dmacon = DMAF_SETCLR | DMAF_DISK; |
| |
| /* init ms timer */ |
| ciaa.crb = 8; /* one-shot, stop */ |
| return 0; |
| |
| out_probe: |
| blk_cleanup_queue(floppy_queue); |
| out_queue: |
| free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
| out_irq2: |
| free_irq(IRQ_AMIGA_DSKBLK, NULL); |
| out_irq: |
| amiga_chip_free(raw_buf); |
| out_memregion: |
| release_mem_region(CUSTOM_PHYSADDR+0x20, 8); |
| out_blkdev: |
| unregister_blkdev(FLOPPY_MAJOR,"fd"); |
| return ret; |
| } |
| |
| module_init(amiga_floppy_init); |
| #ifdef MODULE |
| |
| #if 0 /* not safe to unload */ |
| void cleanup_module(void) |
| { |
| int i; |
| |
| for( i = 0; i < FD_MAX_UNITS; i++) { |
| if (unit[i].type->code != FD_NODRIVE) { |
| del_gendisk(unit[i].gendisk); |
| put_disk(unit[i].gendisk); |
| kfree(unit[i].trackbuf); |
| } |
| } |
| blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); |
| free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
| free_irq(IRQ_AMIGA_DSKBLK, NULL); |
| custom.dmacon = DMAF_DISK; /* disable DMA */ |
| amiga_chip_free(raw_buf); |
| blk_cleanup_queue(floppy_queue); |
| release_mem_region(CUSTOM_PHYSADDR+0x20, 8); |
| unregister_blkdev(FLOPPY_MAJOR, "fd"); |
| } |
| #endif |
| |
| #else |
| static int __init amiga_floppy_setup (char *str) |
| { |
| int n; |
| if (!MACH_IS_AMIGA) |
| return 0; |
| if (!get_option(&str, &n)) |
| return 0; |
| printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); |
| fd_def_df0 = n; |
| return 1; |
| } |
| |
| __setup("floppy=", amiga_floppy_setup); |
| #endif |