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linux/drivers/ide/ide-dma.c
Bartlomiej Zolnierkiewicz 6f5050a96c ide: don't allow DMA to be enabled if CONFIG_IDEDMA_{ICS,PCI}_AUTO=n 
For CONFIG_IDEDMA_{ICS,PCI}_AUTO=n and/or "ide=nodma" option the host/device
are not programmed for DMA and it is also explicitly disabled by ide_set_dma()
(->ide_dma_check returns "-1").  However the code responsible for manually
enabling DMA ("hdparm -d 1") has a bug which results in DMA being erroneously
enabled - ide_set_dma() incorrectly passes "0" return value to set_using_dma().
This may work if BIOS/firmware configured the host/device for DMA and chipset
allows independent configuration of DMA/PIO modes but won't work after suspend
and is generally unsafe on many chipsets (possibly including data corruption
if the same registers are used for DMA/PIO timings).

This patch fixes kernel bugzilla bug #8169 (piix host driver fixes for
setting PIO mode exposed the problem described above).  The side-effect of
the fix is that some rare configuration may be forced to PIO mode when DMA
mode was previously used - this is addressed by the next patch which removes
CONFIG_IDEDMA_{PCI,ICS}_AUTO config option completely.

Thanks goes out to Patrick Horn for reporting the issue, narrowing it down
to the specific commit and testing the fix.  Also thanks to Sergei Shtylyov
for help in debugging the problem.

Cc: Patrick Horn <phrh@yahoo.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Russell King <rmk+lkml@arm.linux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-03-17 21:57:39 +01:00

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/*
* linux/drivers/ide/ide-dma.c Version 4.10 June 9, 2000
*
* Copyright (c) 1999-2000 Andre Hedrick <andre@linux-ide.org>
* May be copied or modified under the terms of the GNU General Public License
*/
/*
* Special Thanks to Mark for his Six years of work.
*
* Copyright (c) 1995-1998 Mark Lord
* May be copied or modified under the terms of the GNU General Public License
*/
/*
* This module provides support for the bus-master IDE DMA functions
* of various PCI chipsets, including the Intel PIIX (i82371FB for
* the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and
* 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
* ("PIIX" stands for "PCI ISA IDE Xcellerator").
*
* Pretty much the same code works for other IDE PCI bus-mastering chipsets.
*
* DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
*
* By default, DMA support is prepared for use, but is currently enabled only
* for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
* or which are recognized as "good" (see table below). Drives with only mode0
* or mode1 (multi/single) DMA should also work with this chipset/driver
* (eg. MC2112A) but are not enabled by default.
*
* Use "hdparm -i" to view modes supported by a given drive.
*
* The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
* DMA support, but must be (re-)compiled against this kernel version or later.
*
* To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
* If problems arise, ide.c will disable DMA operation after a few retries.
* This error recovery mechanism works and has been extremely well exercised.
*
* IDE drives, depending on their vintage, may support several different modes
* of DMA operation. The boot-time modes are indicated with a "*" in
* the "hdparm -i" listing, and can be changed with *knowledgeable* use of
* the "hdparm -X" feature. There is seldom a need to do this, as drives
* normally power-up with their "best" PIO/DMA modes enabled.
*
* Testing has been done with a rather extensive number of drives,
* with Quantum & Western Digital models generally outperforming the pack,
* and Fujitsu & Conner (and some Seagate which are really Conner) drives
* showing more lackluster throughput.
*
* Keep an eye on /var/adm/messages for "DMA disabled" messages.
*
* Some people have reported trouble with Intel Zappa motherboards.
* This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
* available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
* (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
*
* Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
* fixing the problem with the BIOS on some Acer motherboards.
*
* Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
* "TX" chipset compatibility and for providing patches for the "TX" chipset.
*
* Thanks to Christian Brunner <chb@muc.de> for taking a good first crack
* at generic DMA -- his patches were referred to when preparing this code.
*
* Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
* for supplying a Promise UDMA board & WD UDMA drive for this work!
*
* And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
*
* ATA-66/100 and recovery functions, I forgot the rest......
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/irq.h>
static const struct drive_list_entry drive_whitelist [] = {
{ "Micropolis 2112A" , "ALL" },
{ "CONNER CTMA 4000" , "ALL" },
{ "CONNER CTT8000-A" , "ALL" },
{ "ST34342A" , "ALL" },
{ NULL , NULL }
};
static const struct drive_list_entry drive_blacklist [] = {
{ "WDC AC11000H" , "ALL" },
{ "WDC AC22100H" , "ALL" },
{ "WDC AC32500H" , "ALL" },
{ "WDC AC33100H" , "ALL" },
{ "WDC AC31600H" , "ALL" },
{ "WDC AC32100H" , "24.09P07" },
{ "WDC AC23200L" , "21.10N21" },
{ "Compaq CRD-8241B" , "ALL" },
{ "CRD-8400B" , "ALL" },
{ "CRD-8480B", "ALL" },
{ "CRD-8482B", "ALL" },
{ "CRD-84" , "ALL" },
{ "SanDisk SDP3B" , "ALL" },
{ "SanDisk SDP3B-64" , "ALL" },
{ "SANYO CD-ROM CRD" , "ALL" },
{ "HITACHI CDR-8" , "ALL" },
{ "HITACHI CDR-8335" , "ALL" },
{ "HITACHI CDR-8435" , "ALL" },
{ "Toshiba CD-ROM XM-6202B" , "ALL" },
{ "CD-532E-A" , "ALL" },
{ "E-IDE CD-ROM CR-840", "ALL" },
{ "CD-ROM Drive/F5A", "ALL" },
{ "WPI CDD-820", "ALL" },
{ "SAMSUNG CD-ROM SC-148C", "ALL" },
{ "SAMSUNG CD-ROM SC", "ALL" },
{ "SanDisk SDP3B-64" , "ALL" },
{ "ATAPI CD-ROM DRIVE 40X MAXIMUM", "ALL" },
{ "_NEC DV5800A", "ALL" },
{ NULL , NULL }
};
/**
* ide_in_drive_list - look for drive in black/white list
* @id: drive identifier
* @drive_table: list to inspect
*
* Look for a drive in the blacklist and the whitelist tables
* Returns 1 if the drive is found in the table.
*/
int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
{
for ( ; drive_table->id_model ; drive_table++)
if ((!strcmp(drive_table->id_model, id->model)) &&
((strstr(id->fw_rev, drive_table->id_firmware)) ||
(!strcmp(drive_table->id_firmware, "ALL"))))
return 1;
return 0;
}
/**
* ide_dma_intr - IDE DMA interrupt handler
* @drive: the drive the interrupt is for
*
* Handle an interrupt completing a read/write DMA transfer on an
* IDE device
*/
ide_startstop_t ide_dma_intr (ide_drive_t *drive)
{
u8 stat = 0, dma_stat = 0;
dma_stat = HWIF(drive)->ide_dma_end(drive);
stat = HWIF(drive)->INB(IDE_STATUS_REG); /* get drive status */
if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
if (!dma_stat) {
struct request *rq = HWGROUP(drive)->rq;
if (rq->rq_disk) {
ide_driver_t *drv;
drv = *(ide_driver_t **)rq->rq_disk->private_data;
drv->end_request(drive, 1, rq->nr_sectors);
} else
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
}
printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
drive->name, dma_stat);
}
return ide_error(drive, "dma_intr", stat);
}
EXPORT_SYMBOL_GPL(ide_dma_intr);
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
/**
* ide_build_sglist - map IDE scatter gather for DMA I/O
* @drive: the drive to build the DMA table for
* @rq: the request holding the sg list
*
* Perform the PCI mapping magic necessary to access the source or
* target buffers of a request via PCI DMA. The lower layers of the
* kernel provide the necessary cache management so that we can
* operate in a portable fashion
*/
int ide_build_sglist(ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = HWIF(drive);
struct scatterlist *sg = hwif->sg_table;
BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
ide_map_sg(drive, rq);
if (rq_data_dir(rq) == READ)
hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
else
hwif->sg_dma_direction = PCI_DMA_TODEVICE;
return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
}
EXPORT_SYMBOL_GPL(ide_build_sglist);
/**
* ide_build_dmatable - build IDE DMA table
*
* ide_build_dmatable() prepares a dma request. We map the command
* to get the pci bus addresses of the buffers and then build up
* the PRD table that the IDE layer wants to be fed. The code
* knows about the 64K wrap bug in the CS5530.
*
* Returns the number of built PRD entries if all went okay,
* returns 0 otherwise.
*
* May also be invoked from trm290.c
*/
int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned int *table = hwif->dmatable_cpu;
unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
unsigned int count = 0;
int i;
struct scatterlist *sg;
hwif->sg_nents = i = ide_build_sglist(drive, rq);
if (!i)
return 0;
sg = hwif->sg_table;
while (i) {
u32 cur_addr;
u32 cur_len;
cur_addr = sg_dma_address(sg);
cur_len = sg_dma_len(sg);
/*
* Fill in the dma table, without crossing any 64kB boundaries.
* Most hardware requires 16-bit alignment of all blocks,
* but the trm290 requires 32-bit alignment.
*/
while (cur_len) {
if (count++ >= PRD_ENTRIES) {
printk(KERN_ERR "%s: DMA table too small\n", drive->name);
goto use_pio_instead;
} else {
u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
if (bcount > cur_len)
bcount = cur_len;
*table++ = cpu_to_le32(cur_addr);
xcount = bcount & 0xffff;
if (is_trm290)
xcount = ((xcount >> 2) - 1) << 16;
if (xcount == 0x0000) {
/*
* Most chipsets correctly interpret a length of 0x0000 as 64KB,
* but at least one (e.g. CS5530) misinterprets it as zero (!).
* So here we break the 64KB entry into two 32KB entries instead.
*/
if (count++ >= PRD_ENTRIES) {
printk(KERN_ERR "%s: DMA table too small\n", drive->name);
goto use_pio_instead;
}
*table++ = cpu_to_le32(0x8000);
*table++ = cpu_to_le32(cur_addr + 0x8000);
xcount = 0x8000;
}
*table++ = cpu_to_le32(xcount);
cur_addr += bcount;
cur_len -= bcount;
}
}
sg++;
i--;
}
if (count) {
if (!is_trm290)
*--table |= cpu_to_le32(0x80000000);
return count;
}
printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
use_pio_instead:
pci_unmap_sg(hwif->pci_dev,
hwif->sg_table,
hwif->sg_nents,
hwif->sg_dma_direction);
return 0; /* revert to PIO for this request */
}
EXPORT_SYMBOL_GPL(ide_build_dmatable);
/**
* ide_destroy_dmatable - clean up DMA mapping
* @drive: The drive to unmap
*
* Teardown mappings after DMA has completed. This must be called
* after the completion of each use of ide_build_dmatable and before
* the next use of ide_build_dmatable. Failure to do so will cause
* an oops as only one mapping can be live for each target at a given
* time.
*/
void ide_destroy_dmatable (ide_drive_t *drive)
{
struct pci_dev *dev = HWIF(drive)->pci_dev;
struct scatterlist *sg = HWIF(drive)->sg_table;
int nents = HWIF(drive)->sg_nents;
pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
}
EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
/**
* config_drive_for_dma - attempt to activate IDE DMA
* @drive: the drive to place in DMA mode
*
* If the drive supports at least mode 2 DMA or UDMA of any kind
* then attempt to place it into DMA mode. Drives that are known to
* support DMA but predate the DMA properties or that are known
* to have DMA handling bugs are also set up appropriately based
* on the good/bad drive lists.
*/
static int config_drive_for_dma (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
if ((id->capability & 1) && drive->hwif->autodma) {
/*
* Enable DMA on any drive that has
* UltraDMA (mode 0/1/2/3/4/5/6) enabled
*/
if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
return 0;
/*
* Enable DMA on any drive that has mode2 DMA
* (multi or single) enabled
*/
if (id->field_valid & 2) /* regular DMA */
if ((id->dma_mword & 0x404) == 0x404 ||
(id->dma_1word & 0x404) == 0x404)
return 0;
/* Consult the list of known "good" drives */
if (__ide_dma_good_drive(drive))
return 0;
}
return -1;
}
/**
* dma_timer_expiry - handle a DMA timeout
* @drive: Drive that timed out
*
* An IDE DMA transfer timed out. In the event of an error we ask
* the driver to resolve the problem, if a DMA transfer is still
* in progress we continue to wait (arguably we need to add a
* secondary 'I don't care what the drive thinks' timeout here)
* Finally if we have an interrupt we let it complete the I/O.
* But only one time - we clear expiry and if it's still not
* completed after WAIT_CMD, we error and retry in PIO.
* This can occur if an interrupt is lost or due to hang or bugs.
*/
static int dma_timer_expiry (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat = hwif->INB(hwif->dma_status);
printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
drive->name, dma_stat);
if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
return WAIT_CMD;
HWGROUP(drive)->expiry = NULL; /* one free ride for now */
/* 1 dmaing, 2 error, 4 intr */
if (dma_stat & 2) /* ERROR */
return -1;
if (dma_stat & 1) /* DMAing */
return WAIT_CMD;
if (dma_stat & 4) /* Got an Interrupt */
return WAIT_CMD;
return 0; /* Status is unknown -- reset the bus */
}
/**
* ide_dma_host_off - Generic DMA kill
* @drive: drive to control
*
* Perform the generic IDE controller DMA off operation. This
* works for most IDE bus mastering controllers
*/
void ide_dma_host_off(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 unit = (drive->select.b.unit & 0x01);
u8 dma_stat = hwif->INB(hwif->dma_status);
hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
}
EXPORT_SYMBOL(ide_dma_host_off);
/**
* ide_dma_off_quietly - Generic DMA kill
* @drive: drive to control
*
* Turn off the current DMA on this IDE controller.
*/
void ide_dma_off_quietly(ide_drive_t *drive)
{
drive->using_dma = 0;
ide_toggle_bounce(drive, 0);
drive->hwif->dma_host_off(drive);
}
EXPORT_SYMBOL(ide_dma_off_quietly);
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
/**
* ide_dma_off - disable DMA on a device
* @drive: drive to disable DMA on
*
* Disable IDE DMA for a device on this IDE controller.
* Inform the user that DMA has been disabled.
*/
void ide_dma_off(ide_drive_t *drive)
{
printk(KERN_INFO "%s: DMA disabled\n", drive->name);
drive->hwif->dma_off_quietly(drive);
}
EXPORT_SYMBOL(ide_dma_off);
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
/**
* ide_dma_host_on - Enable DMA on a host
* @drive: drive to enable for DMA
*
* Enable DMA on an IDE controller following generic bus mastering
* IDE controller behaviour
*/
void ide_dma_host_on(ide_drive_t *drive)
{
if (drive->using_dma) {
ide_hwif_t *hwif = HWIF(drive);
u8 unit = (drive->select.b.unit & 0x01);
u8 dma_stat = hwif->INB(hwif->dma_status);
hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
}
}
EXPORT_SYMBOL(ide_dma_host_on);
/**
* __ide_dma_on - Enable DMA on a device
* @drive: drive to enable DMA on
*
* Enable IDE DMA for a device on this IDE controller.
*/
int __ide_dma_on (ide_drive_t *drive)
{
/* consult the list of known "bad" drives */
if (__ide_dma_bad_drive(drive))
return 1;
drive->using_dma = 1;
ide_toggle_bounce(drive, 1);
drive->hwif->dma_host_on(drive);
return 0;
}
EXPORT_SYMBOL(__ide_dma_on);
/**
* __ide_dma_check - check DMA setup
* @drive: drive to check
*
* Don't use - due for extermination
*/
int __ide_dma_check (ide_drive_t *drive)
{
return config_drive_for_dma(drive);
}
EXPORT_SYMBOL(__ide_dma_check);
/**
* ide_dma_setup - begin a DMA phase
* @drive: target device
*
* Build an IDE DMA PRD (IDE speak for scatter gather table)
* and then set up the DMA transfer registers for a device
* that follows generic IDE PCI DMA behaviour. Controllers can
* override this function if they need to
*
* Returns 0 on success. If a PIO fallback is required then 1
* is returned.
*/
int ide_dma_setup(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = HWGROUP(drive)->rq;
unsigned int reading;
u8 dma_stat;
if (rq_data_dir(rq))
reading = 0;
else
reading = 1 << 3;
/* fall back to pio! */
if (!ide_build_dmatable(drive, rq)) {
ide_map_sg(drive, rq);
return 1;
}
/* PRD table */
if (hwif->mmio)
writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
else
outl(hwif->dmatable_dma, hwif->dma_prdtable);
/* specify r/w */
hwif->OUTB(reading, hwif->dma_command);
/* read dma_status for INTR & ERROR flags */
dma_stat = hwif->INB(hwif->dma_status);
/* clear INTR & ERROR flags */
hwif->OUTB(dma_stat|6, hwif->dma_status);
drive->waiting_for_dma = 1;
return 0;
}
EXPORT_SYMBOL_GPL(ide_dma_setup);
static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
{
/* issue cmd to drive */
ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
}
void ide_dma_start(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_cmd = hwif->INB(hwif->dma_command);
/* Note that this is done *after* the cmd has
* been issued to the drive, as per the BM-IDE spec.
* The Promise Ultra33 doesn't work correctly when
* we do this part before issuing the drive cmd.
*/
/* start DMA */
hwif->OUTB(dma_cmd|1, hwif->dma_command);
hwif->dma = 1;
wmb();
}
EXPORT_SYMBOL_GPL(ide_dma_start);
/* returns 1 on error, 0 otherwise */
int __ide_dma_end (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat = 0, dma_cmd = 0;
drive->waiting_for_dma = 0;
/* get dma_command mode */
dma_cmd = hwif->INB(hwif->dma_command);
/* stop DMA */
hwif->OUTB(dma_cmd&~1, hwif->dma_command);
/* get DMA status */
dma_stat = hwif->INB(hwif->dma_status);
/* clear the INTR & ERROR bits */
hwif->OUTB(dma_stat|6, hwif->dma_status);
/* purge DMA mappings */
ide_destroy_dmatable(drive);
/* verify good DMA status */
hwif->dma = 0;
wmb();
return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
}
EXPORT_SYMBOL(__ide_dma_end);
/* returns 1 if dma irq issued, 0 otherwise */
static int __ide_dma_test_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat = hwif->INB(hwif->dma_status);
#if 0 /* do not set unless you know what you are doing */
if (dma_stat & 4) {
u8 stat = hwif->INB(IDE_STATUS_REG);
hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
}
#endif
/* return 1 if INTR asserted */
if ((dma_stat & 4) == 4)
return 1;
if (!drive->waiting_for_dma)
printk(KERN_WARNING "%s: (%s) called while not waiting\n",
drive->name, __FUNCTION__);
return 0;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
int __ide_dma_bad_drive (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
int blacklist = ide_in_drive_list(id, drive_blacklist);
if (blacklist) {
printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
drive->name, id->model);
return blacklist;
}
return 0;
}
EXPORT_SYMBOL(__ide_dma_bad_drive);
int __ide_dma_good_drive (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
return ide_in_drive_list(id, drive_whitelist);
}
EXPORT_SYMBOL(__ide_dma_good_drive);
int ide_use_dma(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
ide_hwif_t *hwif = drive->hwif;
if ((id->capability & 1) == 0 || drive->autodma == 0)
return 0;
/* consult the list of known "bad" drives */
if (__ide_dma_bad_drive(drive))
return 0;
/* capable of UltraDMA modes */
if (id->field_valid & 4) {
if (hwif->ultra_mask & id->dma_ultra)
return 1;
}
/* capable of regular DMA modes */
if (id->field_valid & 2) {
if (hwif->mwdma_mask & id->dma_mword)
return 1;
if (hwif->swdma_mask & id->dma_1word)
return 1;
}
/* consult the list of known "good" drives */
if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150)
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(ide_use_dma);
void ide_dma_verbose(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
ide_hwif_t *hwif = HWIF(drive);
if (id->field_valid & 4) {
if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
goto bug_dma_off;
if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
if (((id->dma_ultra >> 11) & 0x1F) &&
eighty_ninty_three(drive)) {
if ((id->dma_ultra >> 15) & 1) {
printk(", UDMA(mode 7)");
} else if ((id->dma_ultra >> 14) & 1) {
printk(", UDMA(133)");
} else if ((id->dma_ultra >> 13) & 1) {
printk(", UDMA(100)");
} else if ((id->dma_ultra >> 12) & 1) {
printk(", UDMA(66)");
} else if ((id->dma_ultra >> 11) & 1) {
printk(", UDMA(44)");
} else
goto mode_two;
} else {
mode_two:
if ((id->dma_ultra >> 10) & 1) {
printk(", UDMA(33)");
} else if ((id->dma_ultra >> 9) & 1) {
printk(", UDMA(25)");
} else if ((id->dma_ultra >> 8) & 1) {
printk(", UDMA(16)");
}
}
} else {
printk(", (U)DMA"); /* Can be BIOS-enabled! */
}
} else if (id->field_valid & 2) {
if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
goto bug_dma_off;
printk(", DMA");
} else if (id->field_valid & 1) {
goto bug_dma_off;
}
return;
bug_dma_off:
printk(", BUG DMA OFF");
hwif->dma_off_quietly(drive);
return;
}
EXPORT_SYMBOL(ide_dma_verbose);
int ide_set_dma(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
int rc;
rc = hwif->ide_dma_check(drive);
switch(rc) {
case -1: /* DMA needs to be disabled */
hwif->dma_off_quietly(drive);
return -1;
case 0: /* DMA needs to be enabled */
return hwif->ide_dma_on(drive);
case 1: /* DMA setting cannot be changed */
break;
default:
BUG();
break;
}
return rc;
}
EXPORT_SYMBOL_GPL(ide_set_dma);
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
int __ide_dma_lostirq (ide_drive_t *drive)
{
printk("%s: DMA interrupt recovery\n", drive->name);
return 1;
}
EXPORT_SYMBOL(__ide_dma_lostirq);
int __ide_dma_timeout (ide_drive_t *drive)
{
printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
if (HWIF(drive)->ide_dma_test_irq(drive))
return 0;
return HWIF(drive)->ide_dma_end(drive);
}
EXPORT_SYMBOL(__ide_dma_timeout);
/*
* Needed for allowing full modular support of ide-driver
*/
static int ide_release_dma_engine(ide_hwif_t *hwif)
{
if (hwif->dmatable_cpu) {
pci_free_consistent(hwif->pci_dev,
PRD_ENTRIES * PRD_BYTES,
hwif->dmatable_cpu,
hwif->dmatable_dma);
hwif->dmatable_cpu = NULL;
}
return 1;
}
static int ide_release_iomio_dma(ide_hwif_t *hwif)
{
release_region(hwif->dma_base, 8);
if (hwif->extra_ports)
release_region(hwif->extra_base, hwif->extra_ports);
return 1;
}
/*
* Needed for allowing full modular support of ide-driver
*/
int ide_release_dma(ide_hwif_t *hwif)
{
ide_release_dma_engine(hwif);
if (hwif->mmio)
return 1;
else
return ide_release_iomio_dma(hwif);
}
static int ide_allocate_dma_engine(ide_hwif_t *hwif)
{
hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
PRD_ENTRIES * PRD_BYTES,
&hwif->dmatable_dma);
if (hwif->dmatable_cpu)
return 0;
printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
hwif->cds->name);
return 1;
}
static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
hwif->dma_base = base;
if(hwif->mate)
hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
else
hwif->dma_master = base;
return 0;
}
static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
hwif->name, base, base + ports - 1);
if (!request_region(base, ports, hwif->name)) {
printk(" -- Error, ports in use.\n");
return 1;
}
hwif->dma_base = base;
if (hwif->cds->extra) {
hwif->extra_base = base + (hwif->channel ? 8 : 16);
if (!hwif->mate || !hwif->mate->extra_ports) {
if (!request_region(hwif->extra_base,
hwif->cds->extra, hwif->cds->name)) {
printk(" -- Error, extra ports in use.\n");
release_region(base, ports);
return 1;
}
hwif->extra_ports = hwif->cds->extra;
}
}
if(hwif->mate)
hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
else
hwif->dma_master = base;
return 0;
}
static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
{
if (hwif->mmio)
return ide_mapped_mmio_dma(hwif, base,ports);
return ide_iomio_dma(hwif, base, ports);
}
/*
* This can be called for a dynamically installed interface. Don't __init it
*/
void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
{
if (ide_dma_iobase(hwif, dma_base, num_ports))
return;
if (ide_allocate_dma_engine(hwif)) {
ide_release_dma(hwif);
return;
}
if (!(hwif->dma_command))
hwif->dma_command = hwif->dma_base;
if (!(hwif->dma_vendor1))
hwif->dma_vendor1 = (hwif->dma_base + 1);
if (!(hwif->dma_status))
hwif->dma_status = (hwif->dma_base + 2);
if (!(hwif->dma_vendor3))
hwif->dma_vendor3 = (hwif->dma_base + 3);
if (!(hwif->dma_prdtable))
hwif->dma_prdtable = (hwif->dma_base + 4);
if (!hwif->dma_off_quietly)
hwif->dma_off_quietly = &ide_dma_off_quietly;
if (!hwif->dma_host_off)
hwif->dma_host_off = &ide_dma_host_off;
if (!hwif->ide_dma_on)
hwif->ide_dma_on = &__ide_dma_on;
if (!hwif->dma_host_on)
hwif->dma_host_on = &ide_dma_host_on;
if (!hwif->ide_dma_check)
hwif->ide_dma_check = &__ide_dma_check;
if (!hwif->dma_setup)
hwif->dma_setup = &ide_dma_setup;
if (!hwif->dma_exec_cmd)
hwif->dma_exec_cmd = &ide_dma_exec_cmd;
if (!hwif->dma_start)
hwif->dma_start = &ide_dma_start;
if (!hwif->ide_dma_end)
hwif->ide_dma_end = &__ide_dma_end;
if (!hwif->ide_dma_test_irq)
hwif->ide_dma_test_irq = &__ide_dma_test_irq;
if (!hwif->ide_dma_timeout)
hwif->ide_dma_timeout = &__ide_dma_timeout;
if (!hwif->ide_dma_lostirq)
hwif->ide_dma_lostirq = &__ide_dma_lostirq;
if (hwif->chipset != ide_trm290) {
u8 dma_stat = hwif->INB(hwif->dma_status);
printk(", BIOS settings: %s:%s, %s:%s",
hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
}
printk("\n");
BUG_ON(!hwif->dma_master);
}
EXPORT_SYMBOL_GPL(ide_setup_dma);
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
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