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original_kernel/drivers/ide/ide-taskfile.c

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/*
* linux/drivers/ide/ide-taskfile.c Version 0.38 March 05, 2003
*
* Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org>
* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2001-2002 Klaus Smolin
* IBM Storage Technology Division
* Copyright (C) 2003-2004 Bartlomiej Zolnierkiewicz
*
* The big the bad and the ugly.
*
* Problems to be fixed because of BH interface or the lack therefore.
*
* Fill me in stupid !!!
*
* HOST:
* General refers to the Controller and Driver "pair".
* DATA HANDLER:
* Under the context of Linux it generally refers to an interrupt handler.
* However, it correctly describes the 'HOST'
* DATA BLOCK:
* The amount of data needed to be transfered as predefined in the
* setup of the device.
* STORAGE ATOMIC:
* The 'DATA BLOCK' associated to the 'DATA HANDLER', and can be as
* small as a single sector or as large as the entire command block
* request.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
static void ata_bswap_data (void *buffer, int wcount)
{
u16 *p = buffer;
while (wcount--) {
*p = *p << 8 | *p >> 8; p++;
*p = *p << 8 | *p >> 8; p++;
}
}
static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
HWIF(drive)->ata_input_data(drive, buffer, wcount);
if (drive->bswap)
ata_bswap_data(buffer, wcount);
}
static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
if (drive->bswap) {
ata_bswap_data(buffer, wcount);
HWIF(drive)->ata_output_data(drive, buffer, wcount);
ata_bswap_data(buffer, wcount);
} else {
HWIF(drive)->ata_output_data(drive, buffer, wcount);
}
}
int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
if (drive->media == ide_disk)
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_IDENTIFY;
else
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_PIDENTIFY;
args.command_type = IDE_DRIVE_TASK_IN;
args.data_phase = TASKFILE_IN;
args.handler = &task_in_intr;
return ide_raw_taskfile(drive, &args, buf);
}
ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
{
ide_hwif_t *hwif = HWIF(drive);
task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
u8 HIHI = (drive->addressing == 1) ? 0xE0 : 0xEF;
/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
if (IDE_CONTROL_REG) {
/* clear nIEN */
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
}
SELECT_MASK(drive, 0);
if (drive->addressing == 1) {
hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
}
hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
if (task->handler != NULL) {
if (task->prehandler != NULL) {
hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
ndelay(400); /* FIXME */
return task->prehandler(drive, task->rq);
}
ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
return ide_started;
}
if (!drive->using_dma)
return ide_stopped;
switch (taskfile->command) {
case WIN_WRITEDMA_ONCE:
case WIN_WRITEDMA:
case WIN_WRITEDMA_EXT:
case WIN_READDMA_ONCE:
case WIN_READDMA:
case WIN_READDMA_EXT:
case WIN_IDENTIFY_DMA:
if (!hwif->dma_setup(drive)) {
hwif->dma_exec_cmd(drive, taskfile->command);
hwif->dma_start(drive);
return ide_started;
}
break;
default:
if (task->handler == NULL)
return ide_stopped;
}
return ide_stopped;
}
/*
* set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
*/
ide_startstop_t set_multmode_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
drive->mult_count = drive->mult_req;
} else {
drive->mult_req = drive->mult_count = 0;
drive->special.b.recalibrate = 1;
(void) ide_dump_status(drive, "set_multmode", stat);
}
return ide_stopped;
}
/*
* set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
*/
ide_startstop_t set_geometry_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
int retries = 5;
u8 stat;
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
udelay(10);
if (OK_STAT(stat, READY_STAT, BAD_STAT))
return ide_stopped;
if (stat & (ERR_STAT|DRQ_STAT))
return ide_error(drive, "set_geometry_intr", stat);
BUG_ON(HWGROUP(drive)->handler != NULL);
ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
/*
* recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
*/
ide_startstop_t recal_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
return ide_error(drive, "recal_intr", stat);
return ide_stopped;
}
/*
* Handler for commands without a data phase
*/
ide_startstop_t task_no_data_intr (ide_drive_t *drive)
{
ide_task_t *args = HWGROUP(drive)->rq->special;
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
local_irq_enable_in_hardirq();
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
return ide_error(drive, "task_no_data_intr", stat);
/* calls ide_end_drive_cmd */
}
if (args)
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
return ide_stopped;
}
EXPORT_SYMBOL(task_no_data_intr);
static u8 wait_drive_not_busy(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
int retries;
u8 stat;
/*
* Last sector was transfered, wait until drive is ready.
* This can take up to 10 usec, but we will wait max 1 ms
* (drive_cmd_intr() waits that long).
*/
for (retries = 0; retries < 100; retries++) {
if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT)
udelay(10);
else
break;
}
if (stat & BUSY_STAT)
printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
return stat;
}
static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
struct page *page;
#ifdef CONFIG_HIGHMEM
unsigned long flags;
#endif
unsigned int offset;
u8 *buf;
page = sg[hwif->cursg].page;
offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
#ifdef CONFIG_HIGHMEM
local_irq_save(flags);
#endif
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
hwif->nleft--;
hwif->cursg_ofs++;
if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
hwif->cursg++;
hwif->cursg_ofs = 0;
}
/* do the actual data transfer */
if (write)
taskfile_output_data(drive, buf, SECTOR_WORDS);
else
taskfile_input_data(drive, buf, SECTOR_WORDS);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
local_irq_restore(flags);
#endif
}
static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
{
unsigned int nsect;
nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
while (nsect--)
ide_pio_sector(drive, write);
}
static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
unsigned int write)
{
if (rq->bio) /* fs request */
rq->errors = 0;
touch_softlockup_watchdog();
switch (drive->hwif->data_phase) {
case TASKFILE_MULTI_IN:
case TASKFILE_MULTI_OUT:
ide_pio_multi(drive, write);
break;
default:
ide_pio_sector(drive, write);
break;
}
}
static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
const char *s, u8 stat)
{
if (rq->bio) {
ide_hwif_t *hwif = drive->hwif;
int sectors = hwif->nsect - hwif->nleft;
switch (hwif->data_phase) {
case TASKFILE_IN:
if (hwif->nleft)
break;
/* fall through */
case TASKFILE_OUT:
sectors--;
break;
case TASKFILE_MULTI_IN:
if (hwif->nleft)
break;
/* fall through */
case TASKFILE_MULTI_OUT:
sectors -= drive->mult_count;
default:
break;
}
if (sectors > 0) {
ide_driver_t *drv;
drv = *(ide_driver_t **)rq->rq_disk->private_data;
drv->end_request(drive, 1, sectors);
}
}
return ide_error(drive, s, stat);
}
static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = rq->special;
if (task->tf_out_flags.all) {
u8 err = drive->hwif->INB(IDE_ERROR_REG);
ide_end_drive_cmd(drive, stat, err);
return;
}
}
if (rq->rq_disk) {
ide_driver_t *drv;
drv = *(ide_driver_t **)rq->rq_disk->private_data;;
drv->end_request(drive, 1, rq->hard_nr_sectors);
} else
ide_end_request(drive, 1, rq->hard_nr_sectors);
}
/*
* Handler for command with PIO data-in phase (Read/Read Multiple).
*/
ide_startstop_t task_in_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
u8 stat = hwif->INB(IDE_STATUS_REG);
/* new way for dealing with premature shared PCI interrupts */
if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
if (stat & (ERR_STAT | DRQ_STAT))
return task_error(drive, rq, __FUNCTION__, stat);
/* No data yet, so wait for another IRQ. */
ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
ide_pio_datablock(drive, rq, 0);
/* If it was the last datablock check status and finish transfer. */
if (!hwif->nleft) {
stat = wait_drive_not_busy(drive);
if (!OK_STAT(stat, 0, BAD_R_STAT))
return task_error(drive, rq, __FUNCTION__, stat);
task_end_request(drive, rq, stat);
return ide_stopped;
}
/* Still data left to transfer. */
ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
EXPORT_SYMBOL(task_in_intr);
/*
* Handler for command with PIO data-out phase (Write/Write Multiple).
*/
static ide_startstop_t task_out_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
u8 stat = hwif->INB(IDE_STATUS_REG);
if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
return task_error(drive, rq, __FUNCTION__, stat);
/* Deal with unexpected ATA data phase. */
if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
return task_error(drive, rq, __FUNCTION__, stat);
if (!hwif->nleft) {
task_end_request(drive, rq, stat);
return ide_stopped;
}
/* Still data left to transfer. */
ide_pio_datablock(drive, rq, 1);
ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
{
ide_startstop_t startstop;
if (ide_wait_stat(&startstop, drive, DATA_READY,
drive->bad_wstat, WAIT_DRQ)) {
printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
drive->name,
drive->hwif->data_phase ? "MULT" : "",
drive->addressing ? "_EXT" : "");
return startstop;
}
if (!drive->unmask)
local_irq_disable();
ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
ide_pio_datablock(drive, rq, 1);
return ide_started;
}
EXPORT_SYMBOL(pre_task_out_intr);
static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
{
struct request rq;
memset(&rq, 0, sizeof(rq));
rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
rq.buffer = buf;
/*
* (ks) We transfer currently only whole sectors.
* This is suffient for now. But, it would be great,
* if we would find a solution to transfer any size.
* To support special commands like READ LONG.
*/
if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
if (data_size == 0)
rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
else
rq.nr_sectors = data_size / SECTOR_SIZE;
if (!rq.nr_sectors) {
printk(KERN_ERR "%s: in/out command without data\n",
drive->name);
return -EFAULT;
}
rq.hard_nr_sectors = rq.nr_sectors;
rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
rq.cmd_flags |= REQ_RW;
}
rq.special = args;
args->rq = &rq;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
{
return ide_diag_taskfile(drive, args, 0, buf);
}
EXPORT_SYMBOL(ide_raw_taskfile);
int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
ide_task_request_t *req_task;
ide_task_t args;
u8 *outbuf = NULL;
u8 *inbuf = NULL;
task_ioreg_t *argsptr = args.tfRegister;
task_ioreg_t *hobsptr = args.hobRegister;
int err = 0;
int tasksize = sizeof(struct ide_task_request_s);
unsigned int taskin = 0;
unsigned int taskout = 0;
u8 io_32bit = drive->io_32bit;
char __user *buf = (char __user *)arg;
// printk("IDE Taskfile ...\n");
req_task = kzalloc(tasksize, GFP_KERNEL);
if (req_task == NULL) return -ENOMEM;
if (copy_from_user(req_task, buf, tasksize)) {
kfree(req_task);
return -EFAULT;
}
taskout = req_task->out_size;
taskin = req_task->in_size;
if (taskin > 65536 || taskout > 65536) {
err = -EINVAL;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
outbuf = kzalloc(taskout, GFP_KERNEL);
if (outbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(outbuf, buf + outtotal, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
inbuf = kzalloc(taskin, GFP_KERNEL);
if (inbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(inbuf, buf + intotal, taskin)) {
err = -EFAULT;
goto abort;
}
}
memset(&args, 0, sizeof(ide_task_t));
memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
args.tf_in_flags = req_task->in_flags;
args.tf_out_flags = req_task->out_flags;
args.data_phase = req_task->data_phase;
args.command_type = req_task->req_cmd;
drive->io_32bit = 0;
switch(req_task->data_phase) {
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
err = ide_diag_taskfile(drive, &args, taskout, outbuf);
break;
case TASKFILE_IN_DMAQ:
case TASKFILE_IN_DMA:
err = ide_diag_taskfile(drive, &args, taskin, inbuf);
break;
case TASKFILE_MULTI_OUT:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
printk(KERN_ERR "%s: %s Multimode Write " \
"multcount is not set\n",
drive->name, __FUNCTION__);
err = -EPERM;
goto abort;
}
/* fall through */
case TASKFILE_OUT:
args.prehandler = &pre_task_out_intr;
args.handler = &task_out_intr;
err = ide_diag_taskfile(drive, &args, taskout, outbuf);
break;
case TASKFILE_MULTI_IN:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
printk(KERN_ERR "%s: %s Multimode Read failure " \
"multcount is not set\n",
drive->name, __FUNCTION__);
err = -EPERM;
goto abort;
}
/* fall through */
case TASKFILE_IN:
args.handler = &task_in_intr;
err = ide_diag_taskfile(drive, &args, taskin, inbuf);
break;
case TASKFILE_NO_DATA:
args.handler = &task_no_data_intr;
err = ide_diag_taskfile(drive, &args, 0, NULL);
break;
default:
err = -EFAULT;
goto abort;
}
memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
req_task->in_flags = args.tf_in_flags;
req_task->out_flags = args.tf_out_flags;
if (copy_to_user(buf, req_task, tasksize)) {
err = -EFAULT;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
if (copy_to_user(buf + outtotal, outbuf, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
if (copy_to_user(buf + intotal, inbuf, taskin)) {
err = -EFAULT;
goto abort;
}
}
abort:
kfree(req_task);
kfree(outbuf);
kfree(inbuf);
// printk("IDE Taskfile ioctl ended. rc = %i\n", err);
drive->io_32bit = io_32bit;
return err;
}
int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
{
struct request rq;
u8 buffer[4];
if (!buf)
buf = buffer;
memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
ide_init_drive_cmd(&rq);
rq.buffer = buf;
*buf++ = cmd;
*buf++ = nsect;
*buf++ = feature;
*buf++ = sectors;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
/*
* FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
*/
int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
int err = 0;
u8 args[4], *argbuf = args;
u8 xfer_rate = 0;
int argsize = 4;
ide_task_t tfargs;
if (NULL == (void *) arg) {
struct request rq;
ide_init_drive_cmd(&rq);
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
if (copy_from_user(args, (void __user *)arg, 4))
return -EFAULT;
memset(&tfargs, 0, sizeof(ide_task_t));
tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
tfargs.tfRegister[IDE_SECTOR_OFFSET] = args[1];
tfargs.tfRegister[IDE_LCYL_OFFSET] = 0x00;
tfargs.tfRegister[IDE_HCYL_OFFSET] = 0x00;
tfargs.tfRegister[IDE_SELECT_OFFSET] = 0x00;
tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
if (args[3]) {
argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
argbuf = kzalloc(argsize, GFP_KERNEL);
if (argbuf == NULL)
return -ENOMEM;
}
if (set_transfer(drive, &tfargs)) {
xfer_rate = args[1];
if (ide_ata66_check(drive, &tfargs))
goto abort;
}
err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
if (!err && xfer_rate) {
/* active-retuning-calls future */
ide_set_xfer_rate(drive, xfer_rate);
ide_driveid_update(drive);
}
abort:
if (copy_to_user((void __user *)arg, argbuf, argsize))
err = -EFAULT;
if (argsize > 4)
kfree(argbuf);
return err;
}
static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
{
struct request rq;
ide_init_drive_cmd(&rq);
rq.cmd_type = REQ_TYPE_ATA_TASK;
rq.buffer = buf;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
/*
* FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
*/
int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
void __user *p = (void __user *)arg;
int err = 0;
u8 args[7], *argbuf = args;
int argsize = 7;
if (copy_from_user(args, p, 7))
return -EFAULT;
err = ide_wait_cmd_task(drive, argbuf);
if (copy_to_user(p, argbuf, argsize))
err = -EFAULT;
return err;
}
/*
* NOTICE: This is additions from IBM to provide a discrete interface,
* for selective taskregister access operations. Nice JOB Klaus!!!
* Glad to be able to work and co-develop this with you and IBM.
*/
ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
{
ide_hwif_t *hwif = HWIF(drive);
task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
if (task->data_phase == TASKFILE_MULTI_IN ||
task->data_phase == TASKFILE_MULTI_OUT) {
if (!drive->mult_count) {
printk(KERN_ERR "%s: multimode not set!\n", drive->name);
return ide_stopped;
}
}
/*
* (ks) Check taskfile in flags.
* If set, then execute as it is defined.
* If not set, then define default settings.
* The default values are:
* read all taskfile registers (except data)
* read the hob registers (sector, nsector, lcyl, hcyl)
*/
if (task->tf_in_flags.all == 0) {
task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
if (drive->addressing == 1)
task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
}
/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
if (IDE_CONTROL_REG)
/* clear nIEN */
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
SELECT_MASK(drive, 0);
if (task->tf_out_flags.b.data) {
u16 data = taskfile->data + (hobfile->data << 8);
hwif->OUTW(data, IDE_DATA_REG);
}
/* (ks) send hob registers first */
if (task->tf_out_flags.b.nsector_hob)
hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
if (task->tf_out_flags.b.sector_hob)
hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
if (task->tf_out_flags.b.lcyl_hob)
hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
if (task->tf_out_flags.b.hcyl_hob)
hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
/* (ks) Send now the standard registers */
if (task->tf_out_flags.b.error_feature)
hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
/* refers to number of sectors to transfer */
if (task->tf_out_flags.b.nsector)
hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
/* refers to sector offset or start sector */
if (task->tf_out_flags.b.sector)
hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
if (task->tf_out_flags.b.lcyl)
hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
if (task->tf_out_flags.b.hcyl)
hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
/*
* (ks) In the flagged taskfile approch, we will use all specified
* registers and the register value will not be changed, except the
* select bit (master/slave) in the drive_head register. We must make
* sure that the desired drive is selected.
*/
hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
switch(task->data_phase) {
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
case TASKFILE_IN_DMAQ:
case TASKFILE_IN_DMA:
hwif->dma_setup(drive);
hwif->dma_exec_cmd(drive, taskfile->command);
hwif->dma_start(drive);
break;
default:
if (task->handler == NULL)
return ide_stopped;
/* Issue the command */
if (task->prehandler) {
hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
ndelay(400); /* FIXME */
return task->prehandler(drive, task->rq);
}
ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
}
return ide_started;
}
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