/* 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: * Aug 19, 2005 ata pci support, supports SATA (Ben Gras) * Nov 18, 2004 moved AT disk driver to user-space (Jorrit N. Herder) * Aug 20, 2004 watchdogs replaced by sync alarms (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 "../libpci/pci.h" #include #include #include #define ATAPI_DEBUG 0 /* To debug ATAPI code. */ /* I/O Ports used by winchester disk controllers. */ /* Read and write registers */ #define REG_CMD_BASE0 0x1F0 /* command base register of controller 0 */ #define REG_CMD_BASE1 0x170 /* command base register of controller 1 */ #define REG_CTL_BASE0 0x3F6 /* control base register of controller 0 */ #define REG_CTL_BASE1 0x376 /* control 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_READ_EXT 0x24 /* read data (LBA48 addressed) */ #define CMD_WRITE 0x30 /* write data */ #define CMD_WRITE_EXT 0x34 /* write data (LBA48 addressed) */ #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 REG_CTL 0 /* 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 */ #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 */ /* Interrupt request lines. */ #define NO_IRQ 0 /* no IRQ set yet */ #define ATAPI_PACKETSIZE 12 #define SENSE_PACKETSIZE 18 /* 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 8 #define COMPAT_DRIVES 4 #define MAX_SECS 256 /* controller can transfer this many sectors */ #define MAX_ERRORS 4 /* how often to try rd/wt before quitting */ #define NR_MINORS (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 DEF_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 */ #define ATAPI 0 /* don't bother with ATAPI; optimise out */ #define IDENTIFIED 0x10 /* w_identify done successfully */ #define IGNORING 0x20 /* w_identify failed once */ /* Timeouts and max retries. */ int timeout_ticks = DEF_TIMEOUT_TICKS, max_errors = MAX_ERRORS; int wakeup_ticks = WAKEUP; long w_standard_timeouts = 0, w_pci_debug = 0, w_instance = 0, w_lba48 = 0, atapi_debug = 0; int w_testing = 0, w_silent = 0; int w_next_drive = 0; /* Variables. */ /* wini is indexed by controller first, then drive (0-3). * controller 0 is always the 'compatability' ide controller, at * the fixed locations, whether present or not. */ PRIVATE struct wini { /* main drive struct, one entry per drive */ unsigned state; /* drive state: deaf, initialized, dead */ unsigned w_status; /* device status register */ unsigned base_cmd; /* command base register */ unsigned base_ctl; /* control base register */ unsigned irq; /* interrupt request line */ unsigned irq_mask; /* 1 << irq */ unsigned irq_need_ack; /* irq needs to be acknowledged */ int irq_hook_id; /* id of irq hook at the kernel */ int lba48; /* supports lba48 */ 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 w_device = -1; PRIVATE int w_controller = -1; PRIVATE int w_major = -1; PRIVATE char w_id_string[40]; 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_drive; /* selected drive */ PRIVATE int w_controller; /* selected controller */ PRIVATE struct device *w_dv; /* device's base and size */ FORWARD _PROTOTYPE( void init_params, (void) ); FORWARD _PROTOTYPE( void init_drive, (struct wini *, int, int, int, int, int, int)); FORWARD _PROTOTYPE( void init_params_pci, (int) ); FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) ); FORWARD _PROTOTYPE( struct device *w_prepare, (int dev) ); FORWARD _PROTOTYPE( int w_identify, (void) ); FORWARD _PROTOTYPE( char *w_name, (void) ); FORWARD _PROTOTYPE( int w_specify, (void) ); FORWARD _PROTOTYPE( int w_io_test, (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( void ack_irqs, (unsigned int) ); FORWARD _PROTOTYPE( int w_do_close, (struct driver *dp, message *m_ptr) ); FORWARD _PROTOTYPE( int w_other, (struct driver *dp, message *m_ptr) ); FORWARD _PROTOTYPE( int w_hw_int, (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) ); /* 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_signal, /* no cleanup needed on shutdown */ nop_alarm, /* ignore leftover alarms */ nop_cancel, /* ignore CANCELs */ nop_select, /* ignore selects */ w_other, /* catch-all for unrecognized commands and ioctls */ w_hw_int /* leftover hardware interrupts */ }; /*===========================================================================* * at_winchester_task * *===========================================================================*/ PUBLIC int main() { /* Set special disk parameters then call the generic main loop. */ init_params(); driver_task(&w_dtab); return(OK); } /*===========================================================================* * 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; /* Boot variables. */ env_parse("ata_std_timeout", "d", 0, &w_standard_timeouts, 0, 1); env_parse("ata_pci_debug", "d", 0, &w_pci_debug, 0, 1); env_parse("ata_instance", "d", 0, &w_instance, 0, 8); env_parse("ata_lba48", "d", 0, &w_lba48, 0, 1); env_parse("atapi_debug", "d", 0, &atapi_debug, 0, 1); if (w_instance == 0) { /* 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) panic(w_name(), "Couldn't read BIOS", s); if ((nr_drives = params[0]) > 2) nr_drives = 2; for (drive = 0, wn = wini; drive < COMPAT_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) 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) 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; } /* Fill in non-BIOS parameters. */ init_drive(wn, drive < 2 ? REG_CMD_BASE0 : REG_CMD_BASE1, drive < 2 ? REG_CTL_BASE0 : REG_CTL_BASE1, NO_IRQ, 0, 0, drive); w_next_drive++; } } /* Look for controllers on the pci bus. Skip none the first instance, * skip one and then 2 for every instance, for every next instance. */ if (w_instance == 0) init_params_pci(0); else init_params_pci(w_instance*2-1); } #define ATA_IF_NOTCOMPAT1 (1L << 0) #define ATA_IF_NOTCOMPAT2 (1L << 2) /*===========================================================================* * init_drive * *===========================================================================*/ PRIVATE void init_drive(struct wini *w, int base_cmd, int base_ctl, int irq, int ack, int hook, int drive) { w->state = 0; w->w_status = 0; w->base_cmd = base_cmd; w->base_ctl = base_ctl; w->irq = irq; w->irq_mask = 1 << irq; w->irq_need_ack = ack; w->irq_hook_id = hook; w->ldhpref = ldh_init(drive); w->max_count = MAX_SECS << SECTOR_SHIFT; w->lba48 = 0; } /*===========================================================================* * init_params_pci * *===========================================================================*/ PRIVATE void init_params_pci(int skip) { int r, devind, drive; u16_t vid, did; pci_init(); for(drive = w_next_drive; drive < MAX_DRIVES; drive++) wini[drive].state = IGNORING; for(r = pci_first_dev(&devind, &vid, &did); r != 0 && w_next_drive < MAX_DRIVES; r = pci_next_dev(&devind, &vid, &did)) { int interface, irq, irq_hook; /* Base class must be 01h (mass storage), subclass must * be 01h (ATA). */ if (pci_attr_r8(devind, PCI_BCR) != 0x01 || pci_attr_r8(devind, PCI_SCR) != 0x01) { continue; } /* Found a controller. * Programming interface register tells us more. */ interface = pci_attr_r8(devind, PCI_PIFR); irq = pci_attr_r8(devind, PCI_ILR); /* Any non-compat drives? */ if (interface & (ATA_IF_NOTCOMPAT1 | ATA_IF_NOTCOMPAT2)) { int s; irq_hook = irq; if (skip > 0) { if (w_pci_debug) printf("atapci skipping controller (remain %d)\n", skip); skip--; continue; } if ((s=sys_irqsetpolicy(irq, 0, &irq_hook)) != OK) { printf("atapci: couldn't set IRQ policy %d\n", irq); continue; } if ((s=sys_irqenable(&irq_hook)) != OK) { printf("atapci: couldn't enable IRQ line %d\n", irq); continue; } } else { /* If not.. this is not the ata-pci controller we're * looking for. */ if (w_pci_debug) printf("atapci skipping compatability controller\n"); continue; } /* Primary channel not in compatability mode? */ if (interface & ATA_IF_NOTCOMPAT1) { u32_t base_cmd, base_ctl; base_cmd = pci_attr_r32(devind, PCI_BAR) & 0xffffffe0; base_ctl = pci_attr_r32(devind, PCI_BAR_2) & 0xffffffe0; if (base_cmd != REG_CMD_BASE0 && base_cmd != REG_CMD_BASE1) { init_drive(&wini[w_next_drive], base_cmd, base_ctl, irq, 1, irq_hook, 0); init_drive(&wini[w_next_drive+1], base_cmd, base_ctl, irq, 1, irq_hook, 1); if (w_pci_debug) printf("atapci %d: 0x%x 0x%x irq %d\n", devind, base_cmd, base_ctl, irq); } else printf("atapci: ignored drives on primary channel, base %x\n", base_cmd); } /* Secondary channel not in compatability mode? */ if (interface & ATA_IF_NOTCOMPAT2) { u32_t base_cmd, base_ctl; base_cmd = pci_attr_r32(devind, PCI_BAR_3) & 0xffffffe0; base_ctl = pci_attr_r32(devind, PCI_BAR_4) & 0xffffffe0; if (base_cmd != REG_CMD_BASE0 && base_cmd != REG_CMD_BASE1) { init_drive(&wini[w_next_drive+2], base_cmd, base_ctl, irq, 1, irq_hook, 2); init_drive(&wini[w_next_drive+3], base_cmd, base_ctl, irq, 1, irq_hook, 3); if (w_pci_debug) printf("atapci %d: 0x%x 0x%x irq %d\n", devind, base_cmd, base_ctl, irq); } else printf("atapci: ignored drives on secondary channel, base %x\n", base_cmd); } w_next_drive += 4; } } /*===========================================================================* * 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 we've probed it before and it failed, don't probe it again. */ if (wn->state & IGNORING) return ENXIO; /* If we haven't identified it yet, or it's gone deaf, * (re-)identify it. */ if (!(wn->state & IDENTIFIED) || (wn->state & DEAF)) { /* Try to identify the device. */ if (w_identify() != OK) { if (wn->state & DEAF) w_reset(); wn->state = IGNORING; return(ENXIO); } /* Do a test transaction unless it's a CD drive (then * we can believe the controller, and a test may fail * due to no CD being in the drive). If it fails, ignore * the device forever. */ if (!(wn->state & ATAPI) && w_io_test() != OK) { wn->state |= IGNORING; return(ENXIO); } } /* If it's not an ATAPI device, then don't open with RO_BIT. */ if (!(wn->state & ATAPI) && (m_ptr->COUNT & RO_BIT)) return EACCES; /* Partition the drive if it's being opened for the first time, * or being opened after being closed. */ if (wn->open_ct == 0) { /* Partition the disk. */ memset(wn->part, sizeof(wn->part), 0); memset(wn->subpart, sizeof(wn->subpart), 0); partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY, wn->state & ATAPI); } wn->open_ct++; return(OK); } /*===========================================================================* * w_prepare * *===========================================================================*/ PRIVATE struct device *w_prepare(int device) { /* Prepare for I/O on a device. */ struct wini *prev_wn; prev_wn = w_wn; w_device = device; if (device < NR_MINORS) { /* 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 { w_device = -1; 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; int i, 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_cmd + REG_DATA, SELF, tmp_buf, SECTOR_SIZE)) != OK) panic(w_name(),"Call to sys_insw() failed", s); /* Why are the strings byte swapped??? */ for (i = 0; i < 40; i++) w_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 (w_lba48 && ((id_word(83)) & (1L << 10))) { /* Drive is LBA48 capable (and LBA48 is turned on). */ if (id_word(102) || id_word(103)) { /* If no. of sectors doesn't fit in 32 bits, * trunacte to this. So it's LBA32 for now. * This can still address devices up to 2TB * though. */ size = ULONG_MAX; } else { /* Actual number of sectors fits in 32 bits. */ size = id_longword(100); } wn->lba48 = 1; } } 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; } } } 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); /* Reset/calibrate (where necessary) */ if (w_specify() != OK && w_specify() != OK) { return(ERR); } if (wn->irq == NO_IRQ) { /* Everything looks OK; register IRQ so we can stop polling. */ wn->irq = w_drive < 2 ? AT_WINI_0_IRQ : AT_WINI_1_IRQ; wn->irq_hook_id = wn->irq; /* id to be returned if interrupt occurs */ if ((s=sys_irqsetpolicy(wn->irq, IRQ_REENABLE, &wn->irq_hook_id)) != OK) panic(w_name(), "couldn't set IRQ policy", s); if ((s=sys_irqenable(&wn->irq_hook_id)) != OK) panic(w_name(), "couldn't enable IRQ line", s); } wn->state |= IDENTIFIED; 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_io_test * *===========================================================================*/ PRIVATE int w_io_test(void) { int r, save_dev; int save_timeout, save_errors, save_wakeup; iovec_t iov; static char buf[SECTOR_SIZE]; iov.iov_addr = (vir_bytes) buf; iov.iov_size = sizeof(buf); save_dev = w_device; /* Reduce timeout values for this test transaction. */ save_timeout = timeout_ticks; save_errors = max_errors; save_wakeup = wakeup_ticks; if (!w_standard_timeouts) { timeout_ticks = HZ * 4; wakeup_ticks = HZ * 6; max_errors = 3; } w_testing = 1; /* Try I/O on the actual drive (not any (sub)partition). */ if (w_prepare(w_drive * DEV_PER_DRIVE) == NIL_DEV) panic(w_name(), "Couldn't switch devices", NO_NUM); r = w_transfer(SELF, DEV_GATHER, 0, &iov, 1); /* Switch back. */ if (w_prepare(save_dev) == NIL_DEV) panic(w_name(), "Couldn't switch back devices", NO_NUM); /* Restore parameters. */ timeout_ticks = save_timeout; max_errors = save_errors; wakeup_ticks = save_wakeup; w_testing = 0; /* Test if everything worked. */ if (r != OK || iov.iov_size != 0) { return ERR; } /* Everything worked. */ return OK; } /*===========================================================================* * 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); } /*===========================================================================* * do_transfer * *===========================================================================*/ PRIVATE int do_transfer(struct wini *wn, unsigned int precomp, unsigned int count, unsigned int sector, unsigned int opcode) { struct command cmd; unsigned secspcyl = wn->pheads * wn->psectors; cmd.precomp = precomp; cmd.count = count; cmd.command = opcode == DEV_SCATTER ? CMD_WRITE : CMD_READ; /* if (w_lba48 && wn->lba48) { } else */ if (wn->ldhpref & LDH_LBA) { cmd.sector = (sector >> 0) & 0xFF; cmd.cyl_lo = (sector >> 8) & 0xFF; cmd.cyl_hi = (sector >> 16) & 0xFF; cmd.ldh = wn->ldhpref | ((sector >> 24) & 0xF); } else { int cylinder, head, sec; cylinder = sector / secspcyl; head = (sector % secspcyl) / wn->psectors; sec = sector % wn->psectors; cmd.sector = sec + 1; cmd.cyl_lo = cylinder & BYTE; cmd.cyl_hi = (cylinder >> 8) & BYTE; cmd.ldh = wn->ldhpref | head; } return com_out(&cmd); } /*===========================================================================* * 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); unsigned cylinder, head, sector, nbytes; /* 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. */ r = do_transfer(wn, wn->precomp, ((nbytes >> SECTOR_SHIFT) & BYTE), block, opcode); 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_wn->w_status & STATUS_DRQ) { if ((s=sys_insw(wn->base_cmd + REG_DATA, SELF, tmp_buf, SECTOR_SIZE)) != OK) 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_cmd + REG_DATA, proc_nr, (void *) iov->iov_addr, SECTOR_SIZE)) != OK) panic(w_name(),"Call to sys_insw() failed", s); } else { if ((s=sys_outsw(wn->base_cmd + REG_DATA, proc_nr, (void *) iov->iov_addr, SECTOR_SIZE)) != OK) 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_cmd = wn->base_cmd; unsigned base_ctl = wn->base_ctl; pvb_pair_t outbyte[7]; /* vector for sys_voutb() */ int s; /* status for sys_(v)outb() */ if (w_wn->state & IGNORING) return ERR; if (!w_waitfor(STATUS_BSY, 0)) { printf("%s: controller not ready\n", w_name()); return(ERR); } /* Select drive. */ if ((s=sys_outb(base_cmd + REG_LDH, cmd->ldh)) != OK) panic(w_name(),"Couldn't write register to select drive",s); if (!w_waitfor(STATUS_BSY, 0)) { printf("%s: com_out: 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_setalarm(wakeup_ticks, 0); wn->w_status = STATUS_ADMBSY; w_command = cmd->command; pv_set(outbyte[0], base_ctl + REG_CTL, wn->pheads >= 8 ? CTL_EIGHTHEADS : 0); pv_set(outbyte[1], base_cmd + REG_PRECOMP, cmd->precomp); pv_set(outbyte[2], base_cmd + REG_COUNT, cmd->count); pv_set(outbyte[3], base_cmd + REG_SECTOR, cmd->sector); pv_set(outbyte[4], base_cmd + REG_CYL_LO, cmd->cyl_lo); pv_set(outbyte[5], base_cmd + REG_CYL_HI, cmd->cyl_hi); pv_set(outbyte[6], base_cmd + REG_COMMAND, cmd->command); if ((s=sys_voutb(outbyte,7)) != OK) panic(w_name(),"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; int dr = 0; for (wn = wini; wn < &wini[MAX_DRIVES]; wn++, dr++) { if (wn->base_cmd == w_wn->base_cmd) { 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--; 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 (w_wn->state & IGNORING) return ERR; 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. */ if (w_testing) wn->state |= IGNORING; /* Kick out this drive. */ else if (!w_silent) printf("%s: timeout on command %02x\n", w_name(), w_command); w_need_reset(); wn->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 = w_wn; /* Don't bother if this drive is forgotten. */ if (w_wn->state & IGNORING) return ERR; /* Wait for any internal drive recovery. */ tickdelay(RECOVERY_TICKS); /* Strobe reset bit */ if ((s=sys_outb(wn->base_ctl + REG_CTL, CTL_RESET)) != OK) panic(w_name(),"Couldn't strobe reset bit",s); tickdelay(DELAY_TICKS); if ((s=sys_outb(wn->base_ctl + REG_CTL, 0)) != OK) panic(w_name(),"Couldn't strobe reset bit",s); tickdelay(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_cmd == w_wn->base_cmd) { wn->state &= ~DEAF; if (w_wn->irq_need_ack) { /* Make sure irq is actually enabled.. */ sys_irqenable(&w_wn->irq_hook_id); } } } 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_wn->w_status & (STATUS_ADMBSY|STATUS_BSY)) { receive(ANY, &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) { sys_inb(w_wn->base_cmd + REG_STATUS, &w_wn->w_status); ack_irqs(m.NOTIFY_ARG); } else { printf("AT_WINI got unexpected message %d from %d\n", m.m_type, m.m_source); } } } 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_wn->w_status & (STATUS_BSY | STATUS_WF | STATUS_ERR)) == 0) { r = OK; } else { if ((s=sys_inb(w_wn->base_cmd + REG_ERROR, &inbval)) != OK) panic(w_name(),"Couldn't read register",s); if ((w_wn->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_wn->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. */ clock_t t0, t1; int s; getuptime(&t0); do { if ((s=sys_inb(w_wn->base_cmd + REG_STATUS, &w_wn->w_status)) != OK) panic(w_name(),"Couldn't read register",s); if ((w_wn->w_status & mask) == value) { return 1; } } while ((s=getuptime(&t1)) == OK && (t1-t0) < timeout_ticks ); if (OK != s) printf("AT_WINI: warning, get_uptime failed: %d\n",s); 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; } } /*===========================================================================* * w_other * *===========================================================================*/ PRIVATE int w_other(dr, m) struct driver *dr; message *m; { int r, timeout, prev; if (m->m_type != DEV_IOCTL ) { return EINVAL; } if (m->REQUEST == DIOCTIMEOUT) { if ((r=sys_datacopy(m->PROC_NR, (vir_bytes)m->ADDRESS, SELF, (vir_bytes)&timeout, sizeof(timeout))) != OK) return r; if (timeout == 0) { /* Restore defaults. */ timeout_ticks = DEF_TIMEOUT_TICKS; max_errors = MAX_ERRORS; wakeup_ticks = WAKEUP; w_silent = 0; } else if (timeout < 0) { return EINVAL; } else { prev = wakeup_ticks; if (!w_standard_timeouts) { /* Set (lower) timeout, lower error * tolerance and set silent mode. */ wakeup_ticks = timeout; max_errors = 3; w_silent = 1; if (timeout_ticks > timeout) timeout_ticks = timeout; } if ((r=sys_datacopy(SELF, (vir_bytes)&prev, m->PROC_NR, (vir_bytes)m->ADDRESS, sizeof(prev))) != OK) return r; } return OK; } else if (m->REQUEST == DIOCOPENCT) { int count; if (w_prepare(m->DEVICE) == NIL_DEV) return ENXIO; count = w_wn->open_ct; if ((r=sys_datacopy(SELF, (vir_bytes)&count, m->PROC_NR, (vir_bytes)m->ADDRESS, sizeof(count))) != OK) return r; return OK; } return EINVAL; } /*===========================================================================* * w_hw_int * *===========================================================================*/ PRIVATE int w_hw_int(dr, m) struct driver *dr; message *m; { /* Leftover interrupt(s) received; ack it/them. */ ack_irqs(m->NOTIFY_ARG); return OK; } /*===========================================================================* * ack_irqs * *===========================================================================*/ PRIVATE void ack_irqs(unsigned int irqs) { unsigned int drive; for (drive = 0; drive < MAX_DRIVES && irqs; drive++) { if (!(wini[drive].state & IGNORING) && wini[drive].irq_need_ack && (wini[drive].irq_mask & irqs)) { if (sys_inb((wini[drive].base_cmd + REG_STATUS), &wini[drive].w_status) != OK) printf("couldn't ack irq on drive %d\n", drive); if (sys_irqenable(&wini[drive].irq_hook_id) != OK) printf("couldn't re-enable drive %d\n", drive); irqs &= ~wini[drive].irq_mask; } } } #define STSTR(a) if (status & STATUS_ ## a) { strcat(str, #a); strcat(str, " "); } #define ERRSTR(a) if (e & ERROR_ ## a) { strcat(str, #a); strcat(str, " "); } char *strstatus(int status) { static char str[200]; str[0] = '\0'; STSTR(BSY); STSTR(DRDY); STSTR(DMADF); STSTR(SRVCDSC); STSTR(DRQ); STSTR(CORR); STSTR(CHECK); return str; } char *strerr(int e) { static char str[200]; str[0] = '\0'; ERRSTR(BB); ERRSTR(ECC); ERRSTR(ID); ERRSTR(AC); ERRSTR(TK); ERRSTR(DM); return str; }