/* This file contains the device dependent part of a driver for the IBM-AT * winchester controller. Written by Adri Koppes. * * The file contains one entry point: * * at_winchester_task: main entry when system is brought up * * Changes: * Nov 18, 2004 moved AT disk driver to user-space (Jorrit N. Herder) * Aug 20, 2004 watchdogs replaced by sync alarms (Jorrit N. Herder) * May 02, 2004 sys_flagalrm() replaces micro_elapsed() (Jorrit N. Herder) * Mar 23, 2000 added ATAPI CDROM support (Michael Temari) * May 14, 2000 d-d/i rewrite (Kees J. Bot) * Apr 13, 1992 device dependent/independent split (Kees J. Bot) */ #include "at_wini.h" #include #include #if ENABLE_AT_WINI #define ATAPI_DEBUG 0 /* To debug ATAPI code. */ /* I/O Ports used by winchester disk controllers. */ /* Read and write registers */ #define REG_BASE0 0x1F0 /* base register of controller 0 */ #define REG_BASE1 0x170 /* base register of controller 1 */ #define REG_DATA 0 /* data register (offset from the base reg.) */ #define REG_PRECOMP 1 /* start of write precompensation */ #define REG_COUNT 2 /* sectors to transfer */ #define REG_SECTOR 3 /* sector number */ #define REG_CYL_LO 4 /* low byte of cylinder number */ #define REG_CYL_HI 5 /* high byte of cylinder number */ #define REG_LDH 6 /* lba, drive and head */ #define LDH_DEFAULT 0xA0 /* ECC enable, 512 bytes per sector */ #define LDH_LBA 0x40 /* Use LBA addressing */ #define ldh_init(drive) (LDH_DEFAULT | ((drive) << 4)) /* Read only registers */ #define REG_STATUS 7 /* status */ #define STATUS_BSY 0x80 /* controller busy */ #define STATUS_RDY 0x40 /* drive ready */ #define STATUS_WF 0x20 /* write fault */ #define STATUS_SC 0x10 /* seek complete (obsolete) */ #define STATUS_DRQ 0x08 /* data transfer request */ #define STATUS_CRD 0x04 /* corrected data */ #define STATUS_IDX 0x02 /* index pulse */ #define STATUS_ERR 0x01 /* error */ #define STATUS_ADMBSY 0x100 /* administratively busy (software) */ #define REG_ERROR 1 /* error code */ #define ERROR_BB 0x80 /* bad block */ #define ERROR_ECC 0x40 /* bad ecc bytes */ #define ERROR_ID 0x10 /* id not found */ #define ERROR_AC 0x04 /* aborted command */ #define ERROR_TK 0x02 /* track zero error */ #define ERROR_DM 0x01 /* no data address mark */ /* Write only registers */ #define REG_COMMAND 7 /* command */ #define CMD_IDLE 0x00 /* for w_command: drive idle */ #define CMD_RECALIBRATE 0x10 /* recalibrate drive */ #define CMD_READ 0x20 /* read data */ #define CMD_WRITE 0x30 /* write data */ #define CMD_READVERIFY 0x40 /* read verify */ #define CMD_FORMAT 0x50 /* format track */ #define CMD_SEEK 0x70 /* seek cylinder */ #define CMD_DIAG 0x90 /* execute device diagnostics */ #define CMD_SPECIFY 0x91 /* specify parameters */ #define ATA_IDENTIFY 0xEC /* identify drive */ #define REG_CTL 0x206 /* control register */ #define CTL_NORETRY 0x80 /* disable access retry */ #define CTL_NOECC 0x40 /* disable ecc retry */ #define CTL_EIGHTHEADS 0x08 /* more than eight heads */ #define CTL_RESET 0x04 /* reset controller */ #define CTL_INTDISABLE 0x02 /* disable interrupts */ #if ENABLE_ATAPI #define ERROR_SENSE 0xF0 /* sense key mask */ #define SENSE_NONE 0x00 /* no sense key */ #define SENSE_RECERR 0x10 /* recovered error */ #define SENSE_NOTRDY 0x20 /* not ready */ #define SENSE_MEDERR 0x30 /* medium error */ #define SENSE_HRDERR 0x40 /* hardware error */ #define SENSE_ILRQST 0x50 /* illegal request */ #define SENSE_UATTN 0x60 /* unit attention */ #define SENSE_DPROT 0x70 /* data protect */ #define SENSE_ABRT 0xb0 /* aborted command */ #define SENSE_MISCOM 0xe0 /* miscompare */ #define ERROR_MCR 0x08 /* media change requested */ #define ERROR_ABRT 0x04 /* aborted command */ #define ERROR_EOM 0x02 /* end of media detected */ #define ERROR_ILI 0x01 /* illegal length indication */ #define REG_FEAT 1 /* features */ #define FEAT_OVERLAP 0x02 /* overlap */ #define FEAT_DMA 0x01 /* dma */ #define REG_IRR 2 /* interrupt reason register */ #define IRR_REL 0x04 /* release */ #define IRR_IO 0x02 /* direction for xfer */ #define IRR_COD 0x01 /* command or data */ #define REG_SAMTAG 3 #define REG_CNT_LO 4 /* low byte of cylinder number */ #define REG_CNT_HI 5 /* high byte of cylinder number */ #define REG_DRIVE 6 /* drive select */ #define REG_STATUS 7 /* status */ #define STATUS_BSY 0x80 /* controller busy */ #define STATUS_DRDY 0x40 /* drive ready */ #define STATUS_DMADF 0x20 /* dma ready/drive fault */ #define STATUS_SRVCDSC 0x10 /* service or dsc */ #define STATUS_DRQ 0x08 /* data transfer request */ #define STATUS_CORR 0x04 /* correctable error occurred */ #define STATUS_CHECK 0x01 /* check error */ #define ATAPI_PACKETCMD 0xA0 /* packet command */ #define ATAPI_IDENTIFY 0xA1 /* identify drive */ #define SCSI_READ10 0x28 /* read from disk */ #define CD_SECTOR_SIZE 2048 /* sector size of a CD-ROM */ #endif /* ATAPI */ /* Interrupt request lines. */ #define NO_IRQ 0 /* no IRQ set yet */ /* Common command block */ struct command { u8_t precomp; /* REG_PRECOMP, etc. */ u8_t count; u8_t sector; u8_t cyl_lo; u8_t cyl_hi; u8_t ldh; u8_t command; }; /* Error codes */ #define ERR (-1) /* general error */ #define ERR_BAD_SECTOR (-2) /* block marked bad detected */ /* Some controllers don't interrupt, the clock will wake us up. */ #define WAKEUP (32*HZ) /* drive may be out for 31 seconds max */ /* Miscellaneous. */ #define MAX_DRIVES 4 /* this driver supports 4 drives (d0 - d3) */ #if _WORD_SIZE > 2 #define MAX_SECS 256 /* controller can transfer this many sectors */ #else #define MAX_SECS 127 /* but not to a 16 bit process */ #endif #define MAX_ERRORS 4 /* how often to try rd/wt before quitting */ #define NR_DEVICES (MAX_DRIVES * DEV_PER_DRIVE) #define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS) #define NR_SUBDEVS (MAX_DRIVES * SUB_PER_DRIVE) #define DELAY_USECS 1000 /* controller timeout in microseconds */ #define DELAY_TICKS 1 /* controller timeout in ticks */ #define TIMEOUT_USECS 5000000 /* controller timeout in microseconds */ #define TIMEOUT_TICKS 300 /* controller timeout in ticks */ #define RECOVERY_USECS 500000 /* controller recovery time in microseconds */ #define RECOVERY_TICKS 30 /* controller recovery time in ticks */ #define INITIALIZED 0x01 /* drive is initialized */ #define DEAF 0x02 /* controller must be reset */ #define SMART 0x04 /* drive supports ATA commands */ #if ENABLE_ATAPI #define ATAPI 0x08 /* it is an ATAPI device */ #else #define ATAPI 0 /* don't bother with ATAPI; optimise out */ #endif /* Variables. */ PRIVATE struct wini { /* main drive struct, one entry per drive */ unsigned state; /* drive state: deaf, initialized, dead */ unsigned base; /* base register of the register file */ unsigned irq; /* interrupt request line */ unsigned lcylinders; /* logical number of cylinders (BIOS) */ unsigned lheads; /* logical number of heads */ unsigned lsectors; /* logical number of sectors per track */ unsigned pcylinders; /* physical number of cylinders (translated) */ unsigned pheads; /* physical number of heads */ unsigned psectors; /* physical number of sectors per track */ unsigned ldhpref; /* top four bytes of the LDH (head) register */ unsigned precomp; /* write precompensation cylinder / 4 */ unsigned max_count; /* max request for this drive */ unsigned open_ct; /* in-use count */ struct device part[DEV_PER_DRIVE]; /* disks and partitions */ struct device subpart[SUB_PER_DRIVE]; /* subpartitions */ } wini[MAX_DRIVES], *w_wn; PRIVATE int win_tasknr; /* my task number */ PRIVATE int w_command; /* current command in execution */ PRIVATE u8_t w_byteval; /* used for SYS_IRQCTL */ PRIVATE int w_status; /* status after interrupt */ PRIVATE int w_drive; /* selected drive */ PRIVATE struct device *w_dv; /* device's base and size */ FORWARD _PROTOTYPE( void init_params, (void) ); FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) ); FORWARD _PROTOTYPE( struct device *w_prepare, (int device) ); FORWARD _PROTOTYPE( int w_identify, (void) ); FORWARD _PROTOTYPE( char *w_name, (void) ); FORWARD _PROTOTYPE( int w_specify, (void) ); FORWARD _PROTOTYPE( int w_transfer, (int proc_nr, int opcode, off_t position, iovec_t *iov, unsigned nr_req) ); FORWARD _PROTOTYPE( int com_out, (struct command *cmd) ); FORWARD _PROTOTYPE( void w_need_reset, (void) ); FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) ); FORWARD _PROTOTYPE( int com_simple, (struct command *cmd) ); FORWARD _PROTOTYPE( void w_timeout, (void) ); FORWARD _PROTOTYPE( int w_reset, (void) ); FORWARD _PROTOTYPE( void w_intr_wait, (void) ); FORWARD _PROTOTYPE( int at_intr_wait, (void) ); FORWARD _PROTOTYPE( int w_waitfor, (int mask, int value) ); FORWARD _PROTOTYPE( void w_geometry, (struct partition *entry) ); #if ENABLE_ATAPI FORWARD _PROTOTYPE( int atapi_sendpacket, (u8_t *packet, unsigned cnt) ); FORWARD _PROTOTYPE( int atapi_intr_wait, (void) ); FORWARD _PROTOTYPE( int atapi_open, (void) ); FORWARD _PROTOTYPE( void atapi_close, (void) ); FORWARD _PROTOTYPE( int atapi_transfer, (int proc_nr, int opcode, off_t position, iovec_t *iov, unsigned nr_req) ); #endif /* Entry points to this driver. */ PRIVATE struct driver w_dtab = { w_name, /* current device's name */ w_do_open, /* open or mount request, initialize device */ w_do_close, /* release device */ do_diocntl, /* get or set a partition's geometry */ w_prepare, /* prepare for I/O on a given minor device */ w_transfer, /* do the I/O */ nop_cleanup, /* nothing to clean up */ w_geometry, /* tell the geometry of the disk */ nop_stop, /* no cleanup needed on shutdown */ nop_alarm, /* ignore leftover alarms */ nop_stats, /* drivers statistics */ }; /*===========================================================================* * at_winchester_task * *===========================================================================*/ PUBLIC void main() { int s; /* Register function key for debugging dumps. */ fkey_enable(SF8); #if DEAD_CODE if ((s=get_own_proc_nr(&win_tasknr)) != OK) server_panic(w_name(),"Couldn't get own process number",s); #endif printf("AT wini task started.\n"); /* Set special disk parameters then call the generic main loop. */ init_params(); driver_task(&w_dtab); } /*============================================================================* * init_params * *============================================================================*/ PRIVATE void init_params() { /* This routine is called at startup to initialize the drive parameters. */ u16_t parv[2]; unsigned int vector, size; int drive, nr_drives; struct wini *wn; u8_t params[16]; int s; /* Get the number of drives from the BIOS data area */ if ((s=sys_vircopy(SELF, BIOS_SEG, NR_HD_DRIVES_ADDR, SELF, D, (vir_bytes) params, NR_HD_DRIVES_SIZE)) != OK) server_panic(w_name(), "Couldn't read BIOS", s); if ((nr_drives = params[0]) > 2) nr_drives = 2; for (drive = 0, wn = wini; drive < MAX_DRIVES; drive++, wn++) { if (drive < nr_drives) { /* Copy the BIOS parameter vector */ vector = (drive == 0) ? BIOS_HD0_PARAMS_ADDR:BIOS_HD1_PARAMS_ADDR; size = (drive == 0) ? BIOS_HD0_PARAMS_SIZE:BIOS_HD1_PARAMS_SIZE; if ((s=sys_vircopy(SELF, BIOS_SEG, vector, SELF, D, (vir_bytes) parv, size)) != OK) server_panic(w_name(), "Couldn't read BIOS", s); /* Calculate the address of the parameters and copy them */ if ((s=sys_vircopy( SELF, BIOS_SEG, hclick_to_physb(parv[1]) + parv[0], SELF, D, (phys_bytes) params, 16L))!=OK) server_panic(w_name(),"Couldn't copy parameters", s); /* Copy the parameters to the structures of the drive */ wn->lcylinders = bp_cylinders(params); wn->lheads = bp_heads(params); wn->lsectors = bp_sectors(params); wn->precomp = bp_precomp(params) >> 2; } wn->ldhpref = ldh_init(drive); wn->max_count = MAX_SECS << SECTOR_SHIFT; /* Base I/O register to address controller. */ wn->base = drive < 2 ? REG_BASE0 : REG_BASE1; } } /*============================================================================* * w_do_open * *============================================================================*/ PRIVATE int w_do_open(dp, m_ptr) struct driver *dp; message *m_ptr; { /* Device open: Initialize the controller and read the partition table. */ struct wini *wn; if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO); wn = w_wn; if (wn->state == 0) { /* Try to identify the device. */ if (w_identify() != OK) { printf("%s: probe failed\n", w_name()); if (wn->state & DEAF) w_reset(); wn->state = 0; return(ENXIO); } } if (wn->open_ct == 0) { #if ENABLE_ATAPI if (wn->state & ATAPI) { int r; if (m_ptr->COUNT & W_BIT) return(EACCES); if ((r = atapi_open()) != OK) return(r); } #endif /* Partition the disk. */ partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY); wn->open_ct++; } return(OK); } /*===========================================================================* * w_prepare * *===========================================================================*/ PRIVATE struct device *w_prepare(device) int device; { /* Prepare for I/O on a device. */ if (device < NR_DEVICES) { /* d0, d0p[0-3], d1, ... */ w_drive = device / DEV_PER_DRIVE; /* save drive number */ w_wn = &wini[w_drive]; w_dv = &w_wn->part[device % DEV_PER_DRIVE]; } else if ((unsigned) (device -= MINOR_d0p0s0) < NR_SUBDEVS) {/*d[0-7]p[0-3]s[0-3]*/ w_drive = device / SUB_PER_DRIVE; w_wn = &wini[w_drive]; w_dv = &w_wn->subpart[device % SUB_PER_DRIVE]; } else { return(NIL_DEV); } return(w_dv); } /*===========================================================================* * w_identify * *===========================================================================*/ PRIVATE int w_identify() { /* Find out if a device exists, if it is an old AT disk, or a newer ATA * drive, a removable media device, etc. */ struct wini *wn = w_wn; struct command cmd; char id_string[40]; int i, r, s; unsigned long size; #define id_byte(n) (&tmp_buf[2 * (n)]) #define id_word(n) (((u16_t) id_byte(n)[0] << 0) \ |((u16_t) id_byte(n)[1] << 8)) #define id_longword(n) (((u32_t) id_byte(n)[0] << 0) \ |((u32_t) id_byte(n)[1] << 8) \ |((u32_t) id_byte(n)[2] << 16) \ |((u32_t) id_byte(n)[3] << 24)) /* Try to identify the device. */ cmd.ldh = wn->ldhpref; cmd.command = ATA_IDENTIFY; if (com_simple(&cmd) == OK) { /* This is an ATA device. */ wn->state |= SMART; /* Device information. */ if ((s=sys_insw(wn->base + REG_DATA, SELF, tmp_buf, SECTOR_SIZE)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); /* Why are the strings byte swapped??? */ for (i = 0; i < 40; i++) id_string[i] = id_byte(27)[i^1]; /* Preferred CHS translation mode. */ wn->pcylinders = id_word(1); wn->pheads = id_word(3); wn->psectors = id_word(6); size = (u32_t) wn->pcylinders * wn->pheads * wn->psectors; if ((id_byte(49)[1] & 0x02) && size > 512L*1024*2) { /* Drive is LBA capable and is big enough to trust it to * not make a mess of it. */ wn->ldhpref |= LDH_LBA; size = id_longword(60); } if (wn->lcylinders == 0) { /* No BIOS parameters? Then make some up. */ wn->lcylinders = wn->pcylinders; wn->lheads = wn->pheads; wn->lsectors = wn->psectors; while (wn->lcylinders > 1024) { wn->lheads *= 2; wn->lcylinders /= 2; } } #if ENABLE_ATAPI } else if (cmd.command = ATAPI_IDENTIFY, com_simple(&cmd) == OK) { /* An ATAPI device. */ wn->state |= ATAPI; /* Device information. */ if ((s=sys_insw(wn->base + REG_DATA, SELF, tmp_buf, 512)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); /* Why are the strings byte swapped??? */ for (i = 0; i < 40; i++) id_string[i] = id_byte(27)[i^1]; size = 0; /* Size set later. */ #endif } else { /* Not an ATA device; no translations, no special features. Don't * touch it unless the BIOS knows about it. */ if (wn->lcylinders == 0) return(ERR); /* no BIOS parameters */ wn->pcylinders = wn->lcylinders; wn->pheads = wn->lheads; wn->psectors = wn->lsectors; size = (u32_t) wn->pcylinders * wn->pheads * wn->psectors; } /* Size of the whole drive */ wn->part[0].dv_size = mul64u(size, SECTOR_SIZE); if (w_specify() != OK && w_specify() != OK) return(ERR); printf("%s: user-space AT Winchester driver detected ", w_name()); if (wn->state & (SMART|ATAPI)) { printf("%.40s\n", id_string); } else { printf("%ux%ux%u\n", wn->pcylinders, wn->pheads, wn->psectors); } /* Everything looks OK; register IRQ so we can stop polling. */ wn->irq = w_drive < 2 ? AT_WINI_0_IRQ : AT_WINI_1_IRQ; #if DEAD_CODE sys_irqsetpolicy(w_wn->irq, (IRQ_READ_PORT | IRQ_BYTE | IRQ_REENABLE), SELF, (w_wn->base + REG_STATUS), &w_byteval, 0); #else sys_irqsetpolicy(w_wn->irq, IRQ_REENABLE, SELF, 0, 0, 0); #endif sys_irqenable(wn->irq); return(OK); } /*===========================================================================* * w_name * *===========================================================================*/ PRIVATE char *w_name() { /* Return a name for the current device. */ static char name[] = "AT-D0"; name[4] = '0' + w_drive; return name; } /*===========================================================================* * w_specify * *===========================================================================*/ PRIVATE int w_specify() { /* Routine to initialize the drive after boot or when a reset is needed. */ struct wini *wn = w_wn; struct command cmd; if ((wn->state & DEAF) && w_reset() != OK) return(ERR); if (!(wn->state & ATAPI)) { /* Specify parameters: precompensation, number of heads and sectors. */ cmd.precomp = wn->precomp; cmd.count = wn->psectors; cmd.ldh = w_wn->ldhpref | (wn->pheads - 1); cmd.command = CMD_SPECIFY; /* Specify some parameters */ /* Output command block and see if controller accepts the parameters. */ if (com_simple(&cmd) != OK) return(ERR); if (!(wn->state & SMART)) { /* Calibrate an old disk. */ cmd.sector = 0; cmd.cyl_lo = 0; cmd.cyl_hi = 0; cmd.ldh = w_wn->ldhpref; cmd.command = CMD_RECALIBRATE; if (com_simple(&cmd) != OK) return(ERR); } } wn->state |= INITIALIZED; return(OK); } /*===========================================================================* * w_transfer * *===========================================================================*/ PRIVATE int w_transfer(proc_nr, opcode, position, iov, nr_req) int proc_nr; /* process doing the request */ int opcode; /* DEV_GATHER or DEV_SCATTER */ off_t position; /* offset on device to read or write */ iovec_t *iov; /* pointer to read or write request vector */ unsigned nr_req; /* length of request vector */ { struct wini *wn = w_wn; iovec_t *iop, *iov_end = iov + nr_req; int r, s, errors; unsigned long block; unsigned long dv_size = cv64ul(w_dv->dv_size); struct command cmd; unsigned cylinder, head, sector, nbytes, count, chunk; unsigned secspcyl = wn->pheads * wn->psectors; #if ENABLE_ATAPI if (w_wn->state & ATAPI) { return atapi_transfer(proc_nr, opcode, position, iov, nr_req); } #endif /* Check disk address. */ if ((position & SECTOR_MASK) != 0) return(EINVAL); errors = 0; while (nr_req > 0) { /* How many bytes to transfer? */ nbytes = 0; for (iop = iov; iop < iov_end; iop++) nbytes += iop->iov_size; if ((nbytes & SECTOR_MASK) != 0) return(EINVAL); /* Which block on disk and how close to EOF? */ if (position >= dv_size) return(OK); /* At EOF */ if (position + nbytes > dv_size) nbytes = dv_size - position; block = div64u(add64ul(w_dv->dv_base, position), SECTOR_SIZE); if (nbytes >= wn->max_count) { /* The drive can't do more then max_count at once. */ nbytes = wn->max_count; } /* First check to see if a reinitialization is needed. */ if (!(wn->state & INITIALIZED) && w_specify() != OK) return(EIO); /* Tell the controller to transfer nbytes bytes. */ cmd.precomp = wn->precomp; cmd.count = (nbytes >> SECTOR_SHIFT) & BYTE; if (wn->ldhpref & LDH_LBA) { cmd.sector = (block >> 0) & 0xFF; cmd.cyl_lo = (block >> 8) & 0xFF; cmd.cyl_hi = (block >> 16) & 0xFF; cmd.ldh = wn->ldhpref | ((block >> 24) & 0xF); } else { cylinder = block / secspcyl; head = (block % secspcyl) / wn->psectors; sector = block % wn->psectors; cmd.sector = sector + 1; cmd.cyl_lo = cylinder & BYTE; cmd.cyl_hi = (cylinder >> 8) & BYTE; cmd.ldh = wn->ldhpref | head; } cmd.command = opcode == DEV_SCATTER ? CMD_WRITE : CMD_READ; r = com_out(&cmd); while (r == OK && nbytes > 0) { /* For each sector, wait for an interrupt and fetch the data * (read), or supply data to the controller and wait for an * interrupt (write). */ if (opcode == DEV_GATHER) { /* First an interrupt, then data. */ if ((r = at_intr_wait()) != OK) { /* An error, send data to the bit bucket. */ if (w_status & STATUS_DRQ) { if ((s=sys_insw(wn->base + REG_DATA, SELF, tmp_buf, SECTOR_SIZE)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); } break; } } /* Wait for data transfer requested. */ if (!w_waitfor(STATUS_DRQ, STATUS_DRQ)) { r = ERR; break; } /* Copy bytes to or from the device's buffer. */ if (opcode == DEV_GATHER) { if ((s=sys_insw(wn->base + REG_DATA, proc_nr, (void *) iov->iov_addr, SECTOR_SIZE)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); } else { if ((s=sys_outsw(wn->base + REG_DATA, proc_nr, (void *) iov->iov_addr, SECTOR_SIZE)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); /* Data sent, wait for an interrupt. */ if ((r = at_intr_wait()) != OK) break; } /* Book the bytes successfully transferred. */ nbytes -= SECTOR_SIZE; position += SECTOR_SIZE; iov->iov_addr += SECTOR_SIZE; if ((iov->iov_size -= SECTOR_SIZE) == 0) { iov++; nr_req--; } } /* Any errors? */ if (r != OK) { /* Don't retry if sector marked bad or too many errors. */ if (r == ERR_BAD_SECTOR || ++errors == MAX_ERRORS) { w_command = CMD_IDLE; return(EIO); } } } w_command = CMD_IDLE; return(OK); } /*============================================================================* * com_out * *============================================================================*/ PRIVATE int com_out(cmd) struct command *cmd; /* Command block */ { /* Output the command block to the winchester controller and return status */ struct wini *wn = w_wn; unsigned base = wn->base; pvb_pair_t outbyte[7]; /* vector for sys_voutb() */ int s; /* status for sys_(v)outb() */ if (!w_waitfor(STATUS_BSY, 0)) { printf("%s: controller not ready\n", w_name()); return(ERR); } /* Select drive. */ if ((s=sys_outb(base + REG_LDH, cmd->ldh)) != OK) server_panic(w_name(),"Couldn't write register to select drive",s); if (!w_waitfor(STATUS_BSY, 0)) { printf("%s: drive not ready\n", w_name()); return(ERR); } /* Schedule a wakeup call, some controllers are flaky. This is done with * a synchronous alarm. If a timeout occurs a SYN_ALARM message is sent * from HARDWARE, so that w_intr_wait() can call w_timeout() in case the * controller was not able to execute the command. Leftover timeouts are * simply ignored by the main loop. */ sys_syncalrm(SELF, WAKEUP, 0); w_status = STATUS_ADMBSY; w_command = cmd->command; pv_set(outbyte[0], base + REG_CTL, wn->pheads >= 8 ? CTL_EIGHTHEADS : 0); pv_set(outbyte[1], base + REG_PRECOMP, cmd->precomp); pv_set(outbyte[2], base + REG_COUNT, cmd->count); pv_set(outbyte[3], base + REG_SECTOR, cmd->sector); pv_set(outbyte[4], base + REG_CYL_LO, cmd->cyl_lo); pv_set(outbyte[5], base + REG_CYL_HI, cmd->cyl_hi); pv_set(outbyte[6], base + REG_COMMAND, cmd->command); if ((s=sys_voutb(outbyte,7)) != OK) server_panic("AT_WINI","Couldn't write registers with sys_voutb()",s); return(OK); } /*===========================================================================* * w_need_reset * *===========================================================================*/ PRIVATE void w_need_reset() { /* The controller needs to be reset. */ struct wini *wn; for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) { wn->state |= DEAF; wn->state &= ~INITIALIZED; } } /*============================================================================* * w_do_close * *============================================================================*/ PRIVATE int w_do_close(dp, m_ptr) struct driver *dp; message *m_ptr; { /* Device close: Release a device. */ if (w_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO); w_wn->open_ct--; #if ENABLE_ATAPI if (w_wn->open_ct == 0 && (w_wn->state & ATAPI)) atapi_close(); #endif return(OK); } /*============================================================================* * com_simple * *============================================================================*/ PRIVATE int com_simple(cmd) struct command *cmd; /* Command block */ { /* A simple controller command, only one interrupt and no data-out phase. */ int r; if ((r = com_out(cmd)) == OK) r = at_intr_wait(); w_command = CMD_IDLE; return(r); } /*===========================================================================* * w_timeout * *===========================================================================*/ PRIVATE void w_timeout(void) { struct wini *wn = w_wn; switch (w_command) { case CMD_IDLE: break; /* fine */ case CMD_READ: case CMD_WRITE: /* Impossible, but not on PC's: The controller does not respond. */ /* Limiting multisector I/O seems to help. */ if (wn->max_count > 8 * SECTOR_SIZE) { wn->max_count = 8 * SECTOR_SIZE; } else { wn->max_count = SECTOR_SIZE; } /*FALL THROUGH*/ default: /* Some other command. */ printf("%s: timeout on command %02x\n", w_name(), w_command); w_need_reset(); w_status = 0; } } /*===========================================================================* * w_reset * *===========================================================================*/ PRIVATE int w_reset() { /* Issue a reset to the controller. This is done after any catastrophe, * like the controller refusing to respond. */ int s; struct wini *wn; /* Wait for any internal drive recovery. */ tick_delay(RECOVERY_TICKS); /* Strobe reset bit */ if ((s=sys_outb(wn->base + REG_CTL, CTL_RESET)) != OK) server_panic("AT_WINI","Couldn't strobe reset bit",s); tick_delay(DELAY_TICKS); if ((s=sys_outb(wn->base + REG_CTL, 0)) != OK) server_panic("AT_WINI","Couldn't strobe reset bit",s); tick_delay(DELAY_TICKS); /* Wait for controller ready */ if (!w_waitfor(STATUS_BSY, 0)) { printf("%s: reset failed, drive busy\n", w_name()); return(ERR); } /* The error register should be checked now, but some drives mess it up. */ for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) { if (wn->base == w_wn->base) wn->state &= ~DEAF; } return(OK); } /*============================================================================* * w_intr_wait * *============================================================================*/ PRIVATE void w_intr_wait() { /* Wait for a task completion interrupt. */ message m; if (w_wn->irq != NO_IRQ) { /* Wait for an interrupt that sets w_status to "not busy". */ while (w_status & (STATUS_ADMBSY|STATUS_BSY)) { receive(HARDWARE, &m); /* expect HARD_INT message */ if (m.m_type == SYN_ALARM) { /* but check for timeout */ w_timeout(); /* a.o. set w_status */ } else if (m.m_type == HARD_INT) { #if DEAD_CODE w_status = w_byteval; /* read by generic handler */ #else sys_inb((w_wn->base + REG_STATUS), &w_status); #endif } } } else { /* Interrupt not yet allocated; use polling. */ (void) w_waitfor(STATUS_BSY, 0); } } /*============================================================================* * at_intr_wait * *============================================================================*/ PRIVATE int at_intr_wait() { /* Wait for an interrupt, study the status bits and return error/success. */ int r; int s,inbval; /* read value with sys_inb */ w_intr_wait(); if ((w_status & (STATUS_BSY | STATUS_WF | STATUS_ERR)) == 0) { r = OK; } else { if ((s=sys_inb(w_wn->base + REG_ERROR, &inbval)) != OK) server_panic(w_name(),"Couldn't read register",s); if ((w_status & STATUS_ERR) && (inbval & ERROR_BB)) { r = ERR_BAD_SECTOR; /* sector marked bad, retries won't help */ } else { r = ERR; /* any other error */ } } w_status |= STATUS_ADMBSY; /* assume still busy with I/O */ return(r); } /*==========================================================================* * w_waitfor * *==========================================================================*/ PRIVATE int w_waitfor(mask, value) int mask; /* status mask */ int value; /* required status */ { /* Wait until controller is in the required state. Return zero on timeout. * An alarm that set a timeout flag is used. TIMEOUT is in micros, we need * ticks. Disabling the alarm is not needed, because a static flag is used * and a leftover timeout cannot do any harm. */ static int timeout_flag = 0; /* must be static, not cancelled */ int s; sys_flagalrm(TIMEOUT_TICKS, &timeout_flag); do { if ((s=sys_inb(w_wn->base + REG_STATUS, &w_status)) != OK) server_panic(w_name(),"Couldn't read register",s); if ((w_status & mask) == value) { return 1; } } while (! timeout_flag); w_need_reset(); /* controller gone deaf */ return(0); } /*============================================================================* * w_geometry * *============================================================================*/ PRIVATE void w_geometry(entry) struct partition *entry; { struct wini *wn = w_wn; if (wn->state & ATAPI) { /* Make up some numbers. */ entry->cylinders = div64u(wn->part[0].dv_size, SECTOR_SIZE) / (64*32); entry->heads = 64; entry->sectors = 32; } else { /* Return logical geometry. */ entry->cylinders = wn->lcylinders; entry->heads = wn->lheads; entry->sectors = wn->lsectors; } } #if ENABLE_ATAPI /*===========================================================================* * atapi_open * *===========================================================================*/ PRIVATE int atapi_open() { /* Should load and lock the device and obtain its size. For now just set the * size of the device to something big. What is really needed is a generic * SCSI layer that does all this stuff for ATAPI and SCSI devices (kjb). (XXX) */ w_wn->part[0].dv_size = mul64u(800L*1024, 1024); return(OK); } /*===========================================================================* * atapi_close * *===========================================================================*/ PRIVATE void atapi_close() { /* Should unlock the device. For now do nothing. (XXX) */ } /*===========================================================================* * atapi_transfer * *===========================================================================*/ PRIVATE int atapi_transfer(proc_nr, opcode, position, iov, nr_req) int proc_nr; /* process doing the request */ int opcode; /* DEV_GATHER or DEV_SCATTER */ off_t position; /* offset on device to read or write */ iovec_t *iov; /* pointer to read or write request vector */ unsigned nr_req; /* length of request vector */ { struct wini *wn = w_wn; iovec_t *iop, *iov_end = iov + nr_req; int r, s, errors, fresh; u64_t pos; unsigned long block; unsigned long dv_size = cv64ul(w_dv->dv_size); unsigned nbytes, nblocks, count, before, chunk; u8_t packet[12]; errors = fresh = 0; while (nr_req > 0 && !fresh) { /* The Minix block size is smaller than the CD block size, so we * may have to read extra before or after the good data. */ pos = add64ul(w_dv->dv_base, position); block = div64u(pos, CD_SECTOR_SIZE); before = rem64u(pos, CD_SECTOR_SIZE); /* How many bytes to transfer? */ nbytes = count = 0; for (iop = iov; iop < iov_end; iop++) { nbytes += iop->iov_size; if ((before + nbytes) % CD_SECTOR_SIZE == 0) count = nbytes; } /* Does one of the memory chunks end nicely on a CD sector multiple? */ if (count != 0) nbytes = count; /* Data comes in as words, so we have to enforce even byte counts. */ if ((before | nbytes) & 1) return(EINVAL); /* Which block on disk and how close to EOF? */ if (position >= dv_size) return(OK); /* At EOF */ if (position + nbytes > dv_size) nbytes = dv_size - position; nblocks = (before + nbytes + CD_SECTOR_SIZE - 1) / CD_SECTOR_SIZE; if (ATAPI_DEBUG) { printf("block=%lu, before=%u, nbytes=%u, nblocks=%u\n", block, before, nbytes, nblocks); } /* First check to see if a reinitialization is needed. */ if (!(wn->state & INITIALIZED) && w_specify() != OK) return(EIO); /* Build an ATAPI command packet. */ packet[0] = SCSI_READ10; packet[1] = 0; packet[2] = (block >> 24) & 0xFF; packet[3] = (block >> 16) & 0xFF; packet[4] = (block >> 8) & 0xFF; packet[5] = (block >> 0) & 0xFF; packet[7] = (nblocks >> 8) & 0xFF; packet[8] = (nblocks >> 0) & 0xFF; packet[9] = 0; packet[10] = 0; packet[11] = 0; /* Tell the controller to execute the packet command. */ r = atapi_sendpacket(packet, nblocks * CD_SECTOR_SIZE); if (r != OK) goto err; /* Read chunks of data. */ while ((r = atapi_intr_wait()) > 0) { count = r; if (ATAPI_DEBUG) { printf("before=%u, nbytes=%u, count=%u\n", before, nbytes, count); } while (before > 0 && count > 0) { /* Discard before. */ chunk = before; if (chunk > count) chunk = count; if (chunk > DMA_BUF_SIZE) chunk = DMA_BUF_SIZE; if ((s=sys_insw(wn->base + REG_DATA, SELF, tmp_buf, chunk)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); before -= chunk; count -= chunk; } while (nbytes > 0 && count > 0) { /* Requested data. */ chunk = nbytes; if (chunk > count) chunk = count; if (chunk > iov->iov_size) chunk = iov->iov_size; if ((s=sys_insw(wn->base + REG_DATA, proc_nr, (void *) iov->iov_addr, chunk)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); position += chunk; nbytes -= chunk; count -= chunk; iov->iov_addr += chunk; fresh = 0; if ((iov->iov_size -= chunk) == 0) { iov++; nr_req--; fresh = 1; /* new element is optional */ } } while (count > 0) { /* Excess data. */ chunk = count; if (chunk > DMA_BUF_SIZE) chunk = DMA_BUF_SIZE; if ((s=sys_insw(wn->base + REG_DATA, SELF, tmp_buf, chunk)) != OK) server_panic(w_name(),"Call to sys_insw() failed", s); count -= chunk; } } if (r < 0) { err: /* Don't retry if too many errors. */ if (++errors == MAX_ERRORS) { w_command = CMD_IDLE; return(EIO); } } } w_command = CMD_IDLE; return(OK); } /*===========================================================================* * atapi_sendpacket * *===========================================================================*/ PRIVATE int atapi_sendpacket(packet, cnt) u8_t *packet; unsigned cnt; { /* Send an Atapi Packet Command */ struct wini *wn = w_wn; message mess; pvb_pair_t outbyte[6]; /* vector for sys_voutb() */ int s; /* Select Master/Slave drive */ if ((s=sys_outb(wn->base + REG_DRIVE, wn->ldhpref)) != OK) server_panic("AT_WINI","Couldn't select master/ slave drive",s); if (!w_waitfor(STATUS_BSY | STATUS_DRQ, 0)) { printf("%s: drive not ready\n", w_name()); return(ERR); } /* Schedule a wakeup call, some controllers are flaky. This is done with * a synchronous alarm. If a timeout occurs a SYN_ALARM message is sent * from HARDWARE, so that w_intr_wait() can call w_timeout() in case the * controller was not able to execute the command. Leftover timeouts are * simply ignored by the main loop. */ sys_syncalrm(SELF, WAKEUP, 0); #if _WORD_SIZE > 2 if (cnt > 0xFFFE) cnt = 0xFFFE; /* Max data per interrupt. */ #endif w_command = ATAPI_PACKETCMD; pv_set(outbyte[0], wn->base + REG_FEAT, 0); pv_set(outbyte[1], wn->base + REG_IRR, 0); pv_set(outbyte[2], wn->base + REG_SAMTAG, 0); pv_set(outbyte[3], wn->base + REG_CNT_LO, (cnt >> 0) & 0xFF); pv_set(outbyte[4], wn->base + REG_CNT_HI, (cnt >> 8) & 0xFF); pv_set(outbyte[5], wn->base + REG_COMMAND, w_command); if ((s=sys_voutb(outbyte,6)) != OK) server_panic("AT_WINI","Couldn't write registers with sys_voutb()",s); if (!w_waitfor(STATUS_BSY | STATUS_DRQ, STATUS_DRQ)) { printf("%s: timeout (BSY|DRQ -> DRQ)\n"); return(ERR); } w_status |= STATUS_ADMBSY; /* Command not at all done yet. */ /* Send the command packet to the device. */ if ((s=sys_outsw(wn->base + REG_DATA, SELF, packet, 12)) != OK) server_panic(w_name(),"sys_outsw() failed", s); return(OK); } /*============================================================================* * atapi_intr_wait * *============================================================================*/ PRIVATE int atapi_intr_wait() { /* Wait for an interrupt and study the results. Returns a number of bytes * that need to be transferred, or an error code. */ struct wini *wn = w_wn; pvb_pair_t inbyte[4]; /* vector for sys_vinb() */ int s; /* status for sys_vinb() */ int e; int len; int irr; int r; int phase; w_intr_wait(); /* Request series of device I/O. */ inbyte[0].port = wn->base + REG_ERROR; inbyte[1].port = wn->base + REG_CNT_LO; inbyte[2].port = wn->base + REG_CNT_HI; inbyte[3].port = wn->base + REG_IRR; if ((s=sys_vinb(inbyte, 4)) != OK) server_panic(w_name(),"ATAPI failed sys_vinb()", s); e = inbyte[0].value; len = inbyte[1].value; len |= inbyte[2].value << 8; irr = inbyte[3].value; if (ATAPI_DEBUG) { printf("S=%02x E=%02x L=%04x I=%02x\n", w_status, e, len, irr); } if (w_status & (STATUS_BSY | STATUS_CHECK)) return ERR; phase = (w_status & STATUS_DRQ) | (irr & (IRR_COD | IRR_IO)); switch (phase) { case IRR_COD | IRR_IO: if (ATAPI_DEBUG) printf("ACD: Phase Command Complete\n"); r = OK; break; case 0: if (ATAPI_DEBUG) printf("ACD: Phase Command Aborted\n"); r = ERR; break; case STATUS_DRQ | IRR_COD: if (ATAPI_DEBUG) printf("ACD: Phase Command Out\n"); r = ERR; break; case STATUS_DRQ: if (ATAPI_DEBUG) printf("ACD: Phase Data Out %d\n", len); r = len; break; case STATUS_DRQ | IRR_IO: if (ATAPI_DEBUG) printf("ACD: Phase Data In %d\n", len); r = len; break; default: if (ATAPI_DEBUG) printf("ACD: Phase Unknown\n"); r = ERR; break; } #if 0 /* retry if the media changed */ XXX while (phase == (IRR_IO | IRR_COD) && (w_status & STATUS_CHECK) && (e & ERROR_SENSE) == SENSE_UATTN && --try > 0); #endif w_status |= STATUS_ADMBSY; /* Assume not done yet. */ return(r); } #endif /* ENABLE_ATAPI */ #endif /* ENABLE_AT_WINI */