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minix/drivers/at_wini/at_wini.c
Jorrit Herder 1ecc6bf3b3 Removed 'system process' magic from PM and FS.
2005-05-13 08:57:08 +00:00

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/* 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 <minix/utils.h>
#include <minix/keymap.h>
#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 */
int irq_hook_id; /* id of irq hook at the kernel */
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 */
};
/*===========================================================================*
* at_winchester_task *
*===========================================================================*/
PUBLIC void main()
{
/* 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 ((s=sys_irqsetpolicy(wn->irq, IRQ_REENABLE, &wn->irq_hook_id)) != OK)
server_panic("AT", "coudn't set IRQ policy", s);
if ((s=sys_irqenable(&wn->irq_hook_id)) != OK)
server_panic("AT", "coudn't enable IRQ line", s);
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: 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_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) {
sys_inb((w_wn->base + REG_STATUS), &w_status);
}
}
} 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;
timeout_flag = 0;
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: atapi_sendpacket: 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 */
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