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linux-next/drivers/ata/libata-sff.c
Alan 4112e16a7c libata-sff: Don't try and activate channels which are not in use
An ATA controller in native mode may have one or more channels disabled
and not assigned resources. In that case the existing code crashes trying
to access I/O ports 0-7.

Add the neccessary check.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-02-09 17:39:30 -05:00

1211 lines
32 KiB
C

/*
* libata-bmdma.c - helper library for PCI IDE BMDMA
*
* Maintained by: Jeff Garzik <jgarzik@pobox.com>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2003-2006 Red Hat, Inc. All rights reserved.
* Copyright 2003-2006 Jeff Garzik
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware documentation available from http://www.t13.org/ and
* http://www.sata-io.org/
*
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/libata.h>
#include "libata.h"
/**
* ata_irq_on - Enable interrupts on a port.
* @ap: Port on which interrupts are enabled.
*
* Enable interrupts on a legacy IDE device using MMIO or PIO,
* wait for idle, clear any pending interrupts.
*
* LOCKING:
* Inherited from caller.
*/
u8 ata_irq_on(struct ata_port *ap)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u8 tmp;
ap->ctl &= ~ATA_NIEN;
ap->last_ctl = ap->ctl;
if (ap->flags & ATA_FLAG_MMIO)
writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
else
outb(ap->ctl, ioaddr->ctl_addr);
tmp = ata_wait_idle(ap);
ap->ops->irq_clear(ap);
return tmp;
}
/**
* ata_tf_load_pio - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Outputs ATA taskfile to standard ATA host controller.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_tf_load_pio(struct ata_port *ap, const struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
outb(tf->ctl, ioaddr->ctl_addr);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
outb(tf->hob_feature, ioaddr->feature_addr);
outb(tf->hob_nsect, ioaddr->nsect_addr);
outb(tf->hob_lbal, ioaddr->lbal_addr);
outb(tf->hob_lbam, ioaddr->lbam_addr);
outb(tf->hob_lbah, ioaddr->lbah_addr);
VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
tf->hob_feature,
tf->hob_nsect,
tf->hob_lbal,
tf->hob_lbam,
tf->hob_lbah);
}
if (is_addr) {
outb(tf->feature, ioaddr->feature_addr);
outb(tf->nsect, ioaddr->nsect_addr);
outb(tf->lbal, ioaddr->lbal_addr);
outb(tf->lbam, ioaddr->lbam_addr);
outb(tf->lbah, ioaddr->lbah_addr);
VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
tf->feature,
tf->nsect,
tf->lbal,
tf->lbam,
tf->lbah);
}
if (tf->flags & ATA_TFLAG_DEVICE) {
outb(tf->device, ioaddr->device_addr);
VPRINTK("device 0x%X\n", tf->device);
}
ata_wait_idle(ap);
}
/**
* ata_tf_load_mmio - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Outputs ATA taskfile to standard ATA host controller using MMIO.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
writeb(tf->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr);
writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr);
writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr);
writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr);
writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr);
VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
tf->hob_feature,
tf->hob_nsect,
tf->hob_lbal,
tf->hob_lbam,
tf->hob_lbah);
}
if (is_addr) {
writeb(tf->feature, (void __iomem *) ioaddr->feature_addr);
writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
tf->feature,
tf->nsect,
tf->lbal,
tf->lbam,
tf->lbah);
}
if (tf->flags & ATA_TFLAG_DEVICE) {
writeb(tf->device, (void __iomem *) ioaddr->device_addr);
VPRINTK("device 0x%X\n", tf->device);
}
ata_wait_idle(ap);
}
/**
* ata_tf_load - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Outputs ATA taskfile to standard ATA host controller using MMIO
* or PIO as indicated by the ATA_FLAG_MMIO flag.
* Writes the control, feature, nsect, lbal, lbam, and lbah registers.
* Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
* hob_lbal, hob_lbam, and hob_lbah.
*
* This function waits for idle (!BUSY and !DRQ) after writing
* registers. If the control register has a new value, this
* function also waits for idle after writing control and before
* writing the remaining registers.
*
* May be used as the tf_load() entry in ata_port_operations.
*
* LOCKING:
* Inherited from caller.
*/
void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
{
if (ap->flags & ATA_FLAG_MMIO)
ata_tf_load_mmio(ap, tf);
else
ata_tf_load_pio(ap, tf);
}
/**
* ata_exec_command_pio - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues PIO write to ATA command register, with proper
* synchronization with interrupt handler / other threads.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf)
{
DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
outb(tf->command, ap->ioaddr.command_addr);
ata_pause(ap);
}
/**
* ata_exec_command_mmio - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues MMIO write to ATA command register, with proper
* synchronization with interrupt handler / other threads.
*
* FIXME: missing write posting for 400nS delay enforcement
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
{
DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr);
ata_pause(ap);
}
/**
* ata_exec_command - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues PIO/MMIO write to ATA command register, with proper
* synchronization with interrupt handler / other threads.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
{
if (ap->flags & ATA_FLAG_MMIO)
ata_exec_command_mmio(ap, tf);
else
ata_exec_command_pio(ap, tf);
}
/**
* ata_tf_read_pio - input device's ATA taskfile shadow registers
* @ap: Port from which input is read
* @tf: ATA taskfile register set for storing input
*
* Reads ATA taskfile registers for currently-selected device
* into @tf.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
tf->command = ata_check_status(ap);
tf->feature = inb(ioaddr->error_addr);
tf->nsect = inb(ioaddr->nsect_addr);
tf->lbal = inb(ioaddr->lbal_addr);
tf->lbam = inb(ioaddr->lbam_addr);
tf->lbah = inb(ioaddr->lbah_addr);
tf->device = inb(ioaddr->device_addr);
if (tf->flags & ATA_TFLAG_LBA48) {
outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
tf->hob_feature = inb(ioaddr->error_addr);
tf->hob_nsect = inb(ioaddr->nsect_addr);
tf->hob_lbal = inb(ioaddr->lbal_addr);
tf->hob_lbam = inb(ioaddr->lbam_addr);
tf->hob_lbah = inb(ioaddr->lbah_addr);
}
}
/**
* ata_tf_read_mmio - input device's ATA taskfile shadow registers
* @ap: Port from which input is read
* @tf: ATA taskfile register set for storing input
*
* Reads ATA taskfile registers for currently-selected device
* into @tf via MMIO.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
tf->command = ata_check_status(ap);
tf->feature = readb((void __iomem *)ioaddr->error_addr);
tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
tf->lbah = readb((void __iomem *)ioaddr->lbah_addr);
tf->device = readb((void __iomem *)ioaddr->device_addr);
if (tf->flags & ATA_TFLAG_LBA48) {
writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr);
tf->hob_feature = readb((void __iomem *)ioaddr->error_addr);
tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr);
tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr);
tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr);
tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr);
}
}
/**
* ata_tf_read - input device's ATA taskfile shadow registers
* @ap: Port from which input is read
* @tf: ATA taskfile register set for storing input
*
* Reads ATA taskfile registers for currently-selected device
* into @tf.
*
* Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
* is set, also reads the hob registers.
*
* May be used as the tf_read() entry in ata_port_operations.
*
* LOCKING:
* Inherited from caller.
*/
void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
if (ap->flags & ATA_FLAG_MMIO)
ata_tf_read_mmio(ap, tf);
else
ata_tf_read_pio(ap, tf);
}
/**
* ata_check_status_pio - Read device status reg & clear interrupt
* @ap: port where the device is
*
* Reads ATA taskfile status register for currently-selected device
* and return its value. This also clears pending interrupts
* from this device
*
* LOCKING:
* Inherited from caller.
*/
static u8 ata_check_status_pio(struct ata_port *ap)
{
return inb(ap->ioaddr.status_addr);
}
/**
* ata_check_status_mmio - Read device status reg & clear interrupt
* @ap: port where the device is
*
* Reads ATA taskfile status register for currently-selected device
* via MMIO and return its value. This also clears pending interrupts
* from this device
*
* LOCKING:
* Inherited from caller.
*/
static u8 ata_check_status_mmio(struct ata_port *ap)
{
return readb((void __iomem *) ap->ioaddr.status_addr);
}
/**
* ata_check_status - Read device status reg & clear interrupt
* @ap: port where the device is
*
* Reads ATA taskfile status register for currently-selected device
* and return its value. This also clears pending interrupts
* from this device
*
* May be used as the check_status() entry in ata_port_operations.
*
* LOCKING:
* Inherited from caller.
*/
u8 ata_check_status(struct ata_port *ap)
{
if (ap->flags & ATA_FLAG_MMIO)
return ata_check_status_mmio(ap);
return ata_check_status_pio(ap);
}
/**
* ata_altstatus - Read device alternate status reg
* @ap: port where the device is
*
* Reads ATA taskfile alternate status register for
* currently-selected device and return its value.
*
* Note: may NOT be used as the check_altstatus() entry in
* ata_port_operations.
*
* LOCKING:
* Inherited from caller.
*/
u8 ata_altstatus(struct ata_port *ap)
{
if (ap->ops->check_altstatus)
return ap->ops->check_altstatus(ap);
if (ap->flags & ATA_FLAG_MMIO)
return readb((void __iomem *)ap->ioaddr.altstatus_addr);
return inb(ap->ioaddr.altstatus_addr);
}
/**
* ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
u8 dmactl;
void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
/* load PRD table addr. */
mb(); /* make sure PRD table writes are visible to controller */
writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
/* specify data direction, triple-check start bit is clear */
dmactl = readb(mmio + ATA_DMA_CMD);
dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
if (!rw)
dmactl |= ATA_DMA_WR;
writeb(dmactl, mmio + ATA_DMA_CMD);
/* issue r/w command */
ap->ops->exec_command(ap, &qc->tf);
}
/**
* ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
u8 dmactl;
/* start host DMA transaction */
dmactl = readb(mmio + ATA_DMA_CMD);
writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
/* Strictly, one may wish to issue a readb() here, to
* flush the mmio write. However, control also passes
* to the hardware at this point, and it will interrupt
* us when we are to resume control. So, in effect,
* we don't care when the mmio write flushes.
* Further, a read of the DMA status register _immediately_
* following the write may not be what certain flaky hardware
* is expected, so I think it is best to not add a readb()
* without first all the MMIO ATA cards/mobos.
* Or maybe I'm just being paranoid.
*/
}
/**
* ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
u8 dmactl;
/* load PRD table addr. */
outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
/* specify data direction, triple-check start bit is clear */
dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
if (!rw)
dmactl |= ATA_DMA_WR;
outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
/* issue r/w command */
ap->ops->exec_command(ap, &qc->tf);
}
/**
* ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
u8 dmactl;
/* start host DMA transaction */
dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
outb(dmactl | ATA_DMA_START,
ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
}
/**
* ata_bmdma_start - Start a PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* Writes the ATA_DMA_START flag to the DMA command register.
*
* May be used as the bmdma_start() entry in ata_port_operations.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_bmdma_start(struct ata_queued_cmd *qc)
{
if (qc->ap->flags & ATA_FLAG_MMIO)
ata_bmdma_start_mmio(qc);
else
ata_bmdma_start_pio(qc);
}
/**
* ata_bmdma_setup - Set up PCI IDE BMDMA transaction
* @qc: Info associated with this ATA transaction.
*
* Writes address of PRD table to device's PRD Table Address
* register, sets the DMA control register, and calls
* ops->exec_command() to start the transfer.
*
* May be used as the bmdma_setup() entry in ata_port_operations.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_bmdma_setup(struct ata_queued_cmd *qc)
{
if (qc->ap->flags & ATA_FLAG_MMIO)
ata_bmdma_setup_mmio(qc);
else
ata_bmdma_setup_pio(qc);
}
/**
* ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
* @ap: Port associated with this ATA transaction.
*
* Clear interrupt and error flags in DMA status register.
*
* May be used as the irq_clear() entry in ata_port_operations.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_bmdma_irq_clear(struct ata_port *ap)
{
if (!ap->ioaddr.bmdma_addr)
return;
if (ap->flags & ATA_FLAG_MMIO) {
void __iomem *mmio =
((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
writeb(readb(mmio), mmio);
} else {
unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
outb(inb(addr), addr);
}
}
/**
* ata_bmdma_status - Read PCI IDE BMDMA status
* @ap: Port associated with this ATA transaction.
*
* Read and return BMDMA status register.
*
* May be used as the bmdma_status() entry in ata_port_operations.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
u8 ata_bmdma_status(struct ata_port *ap)
{
u8 host_stat;
if (ap->flags & ATA_FLAG_MMIO) {
void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
host_stat = readb(mmio + ATA_DMA_STATUS);
} else
host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
return host_stat;
}
/**
* ata_bmdma_stop - Stop PCI IDE BMDMA transfer
* @qc: Command we are ending DMA for
*
* Clears the ATA_DMA_START flag in the dma control register
*
* May be used as the bmdma_stop() entry in ata_port_operations.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
if (ap->flags & ATA_FLAG_MMIO) {
void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
/* clear start/stop bit */
writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
mmio + ATA_DMA_CMD);
} else {
/* clear start/stop bit */
outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
}
/* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
ata_altstatus(ap); /* dummy read */
}
/**
* ata_bmdma_freeze - Freeze BMDMA controller port
* @ap: port to freeze
*
* Freeze BMDMA controller port.
*
* LOCKING:
* Inherited from caller.
*/
void ata_bmdma_freeze(struct ata_port *ap)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
ap->ctl |= ATA_NIEN;
ap->last_ctl = ap->ctl;
if (ap->flags & ATA_FLAG_MMIO)
writeb(ap->ctl, (void __iomem *)ioaddr->ctl_addr);
else
outb(ap->ctl, ioaddr->ctl_addr);
/* Under certain circumstances, some controllers raise IRQ on
* ATA_NIEN manipulation. Also, many controllers fail to mask
* previously pending IRQ on ATA_NIEN assertion. Clear it.
*/
ata_chk_status(ap);
ap->ops->irq_clear(ap);
}
/**
* ata_bmdma_thaw - Thaw BMDMA controller port
* @ap: port to thaw
*
* Thaw BMDMA controller port.
*
* LOCKING:
* Inherited from caller.
*/
void ata_bmdma_thaw(struct ata_port *ap)
{
/* clear & re-enable interrupts */
ata_chk_status(ap);
ap->ops->irq_clear(ap);
if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
ata_irq_on(ap);
}
/**
* ata_bmdma_drive_eh - Perform EH with given methods for BMDMA controller
* @ap: port to handle error for
* @prereset: prereset method (can be NULL)
* @softreset: softreset method (can be NULL)
* @hardreset: hardreset method (can be NULL)
* @postreset: postreset method (can be NULL)
*
* Handle error for ATA BMDMA controller. It can handle both
* PATA and SATA controllers. Many controllers should be able to
* use this EH as-is or with some added handling before and
* after.
*
* This function is intended to be used for constructing
* ->error_handler callback by low level drivers.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
ata_postreset_fn_t postreset)
{
struct ata_queued_cmd *qc;
unsigned long flags;
int thaw = 0;
qc = __ata_qc_from_tag(ap, ap->active_tag);
if (qc && !(qc->flags & ATA_QCFLAG_FAILED))
qc = NULL;
/* reset PIO HSM and stop DMA engine */
spin_lock_irqsave(ap->lock, flags);
ap->hsm_task_state = HSM_ST_IDLE;
if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
qc->tf.protocol == ATA_PROT_ATAPI_DMA)) {
u8 host_stat;
host_stat = ap->ops->bmdma_status(ap);
/* BMDMA controllers indicate host bus error by
* setting DMA_ERR bit and timing out. As it wasn't
* really a timeout event, adjust error mask and
* cancel frozen state.
*/
if (qc->err_mask == AC_ERR_TIMEOUT && host_stat & ATA_DMA_ERR) {
qc->err_mask = AC_ERR_HOST_BUS;
thaw = 1;
}
ap->ops->bmdma_stop(qc);
}
ata_altstatus(ap);
ata_chk_status(ap);
ap->ops->irq_clear(ap);
spin_unlock_irqrestore(ap->lock, flags);
if (thaw)
ata_eh_thaw_port(ap);
/* PIO and DMA engines have been stopped, perform recovery */
ata_do_eh(ap, prereset, softreset, hardreset, postreset);
}
/**
* ata_bmdma_error_handler - Stock error handler for BMDMA controller
* @ap: port to handle error for
*
* Stock error handler for BMDMA controller.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_bmdma_error_handler(struct ata_port *ap)
{
ata_reset_fn_t hardreset;
hardreset = NULL;
if (sata_scr_valid(ap))
hardreset = sata_std_hardreset;
ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, hardreset,
ata_std_postreset);
}
/**
* ata_bmdma_post_internal_cmd - Stock post_internal_cmd for
* BMDMA controller
* @qc: internal command to clean up
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc)
{
if (qc->ap->ioaddr.bmdma_addr)
ata_bmdma_stop(qc);
}
#ifdef CONFIG_PCI
static int ata_resources_present(struct pci_dev *pdev, int port)
{
int i;
/* Check the PCI resources for this channel are enabled */
port = port * 2;
for (i = 0; i < 2; i ++) {
if (pci_resource_start(pdev, port + i) == 0 ||
pci_resource_len(pdev, port + i) == 0)
return 0;
}
return 1;
}
/**
* ata_pci_init_native_mode - Initialize native-mode driver
* @pdev: pci device to be initialized
* @port: array[2] of pointers to port info structures.
* @ports: bitmap of ports present
*
* Utility function which allocates and initializes an
* ata_probe_ent structure for a standard dual-port
* PIO-based IDE controller. The returned ata_probe_ent
* structure can be passed to ata_device_add(). The returned
* ata_probe_ent structure should then be freed with kfree().
*
* The caller need only pass the address of the primary port, the
* secondary will be deduced automatically. If the device has non
* standard secondary port mappings this function can be called twice,
* once for each interface.
*/
struct ata_probe_ent *
ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
{
struct ata_probe_ent *probe_ent =
ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
int p = 0;
unsigned long bmdma;
if (!probe_ent)
return NULL;
probe_ent->irq = pdev->irq;
probe_ent->irq_flags = IRQF_SHARED;
/* Discard disabled ports. Some controllers show their
unused channels this way */
if (ata_resources_present(pdev, 0) == 0)
ports &= ~ATA_PORT_PRIMARY;
if (ata_resources_present(pdev, 1) == 0)
ports &= ~ATA_PORT_SECONDARY;
if (ports & ATA_PORT_PRIMARY) {
probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
probe_ent->port[p].altstatus_addr =
probe_ent->port[p].ctl_addr =
pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
bmdma = pci_resource_start(pdev, 4);
if (bmdma) {
if ((!(port[p]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
(inb(bmdma + 2) & 0x80))
probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
probe_ent->port[p].bmdma_addr = bmdma;
}
ata_std_ports(&probe_ent->port[p]);
p++;
}
if (ports & ATA_PORT_SECONDARY) {
probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2);
probe_ent->port[p].altstatus_addr =
probe_ent->port[p].ctl_addr =
pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
bmdma = pci_resource_start(pdev, 4);
if (bmdma) {
bmdma += 8;
if ((!(port[p]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
(inb(bmdma + 2) & 0x80))
probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
probe_ent->port[p].bmdma_addr = bmdma;
}
ata_std_ports(&probe_ent->port[p]);
probe_ent->pinfo2 = port[1];
p++;
}
probe_ent->n_ports = p;
return probe_ent;
}
static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
struct ata_port_info **port, int port_mask)
{
struct ata_probe_ent *probe_ent;
unsigned long bmdma = pci_resource_start(pdev, 4);
probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
if (!probe_ent)
return NULL;
probe_ent->n_ports = 2;
probe_ent->irq_flags = IRQF_SHARED;
if (port_mask & ATA_PORT_PRIMARY) {
probe_ent->irq = ATA_PRIMARY_IRQ(pdev);
probe_ent->port[0].cmd_addr = ATA_PRIMARY_CMD;
probe_ent->port[0].altstatus_addr =
probe_ent->port[0].ctl_addr = ATA_PRIMARY_CTL;
if (bmdma) {
probe_ent->port[0].bmdma_addr = bmdma;
if ((!(port[0]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
(inb(bmdma + 2) & 0x80))
probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
}
ata_std_ports(&probe_ent->port[0]);
} else
probe_ent->dummy_port_mask |= ATA_PORT_PRIMARY;
if (port_mask & ATA_PORT_SECONDARY) {
if (probe_ent->irq)
probe_ent->irq2 = ATA_SECONDARY_IRQ(pdev);
else
probe_ent->irq = ATA_SECONDARY_IRQ(pdev);
probe_ent->port[1].cmd_addr = ATA_SECONDARY_CMD;
probe_ent->port[1].altstatus_addr =
probe_ent->port[1].ctl_addr = ATA_SECONDARY_CTL;
if (bmdma) {
probe_ent->port[1].bmdma_addr = bmdma + 8;
if ((!(port[1]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
(inb(bmdma + 10) & 0x80))
probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
}
ata_std_ports(&probe_ent->port[1]);
/* FIXME: could be pointing to stack area; must copy */
probe_ent->pinfo2 = port[1];
} else
probe_ent->dummy_port_mask |= ATA_PORT_SECONDARY;
return probe_ent;
}
/**
* ata_pci_init_one - Initialize/register PCI IDE host controller
* @pdev: Controller to be initialized
* @port_info: Information from low-level host driver
* @n_ports: Number of ports attached to host controller
*
* This is a helper function which can be called from a driver's
* xxx_init_one() probe function if the hardware uses traditional
* IDE taskfile registers.
*
* This function calls pci_enable_device(), reserves its register
* regions, sets the dma mask, enables bus master mode, and calls
* ata_device_add()
*
* ASSUMPTION:
* Nobody makes a single channel controller that appears solely as
* the secondary legacy port on PCI.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, negative on errno-based value on error.
*/
int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
unsigned int n_ports)
{
struct ata_probe_ent *probe_ent = NULL;
struct ata_port_info *port[2];
u8 mask;
unsigned int legacy_mode = 0;
int disable_dev_on_err = 1;
int rc;
DPRINTK("ENTER\n");
BUG_ON(n_ports < 1 || n_ports > 2);
port[0] = port_info[0];
if (n_ports > 1)
port[1] = port_info[1];
else
port[1] = port[0];
/* FIXME: Really for ATA it isn't safe because the device may be
multi-purpose and we want to leave it alone if it was already
enabled. Secondly for shared use as Arjan says we want refcounting
Checking dev->is_enabled is insufficient as this is not set at
boot for the primary video which is BIOS enabled
*/
rc = pci_enable_device(pdev);
if (rc)
return rc;
if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
u8 tmp8;
/* TODO: What if one channel is in native mode ... */
pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
mask = (1 << 2) | (1 << 0);
if ((tmp8 & mask) != mask)
legacy_mode = (1 << 3);
#if defined(CONFIG_NO_ATA_LEGACY)
/* Some platforms with PCI limits cannot address compat
port space. In that case we punt if their firmware has
left a device in compatibility mode */
if (legacy_mode) {
printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
return -EOPNOTSUPP;
}
#endif
}
if (!legacy_mode) {
rc = pci_request_regions(pdev, DRV_NAME);
if (rc) {
disable_dev_on_err = 0;
goto err_out;
}
} else {
/* Deal with combined mode hack. This side of the logic all
goes away once the combined mode hack is killed in 2.6.21 */
if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
struct resource *conflict, res;
res.start = ATA_PRIMARY_CMD;
res.end = ATA_PRIMARY_CMD + 8 - 1;
conflict = ____request_resource(&ioport_resource, &res);
while (conflict->child)
conflict = ____request_resource(conflict, &res);
if (!strcmp(conflict->name, "libata"))
legacy_mode |= ATA_PORT_PRIMARY;
else {
disable_dev_on_err = 0;
printk(KERN_WARNING "ata: 0x%0X IDE port busy\n" \
"ata: conflict with %s\n",
ATA_PRIMARY_CMD,
conflict->name);
}
} else
legacy_mode |= ATA_PORT_PRIMARY;
if (!request_region(ATA_SECONDARY_CMD, 8, "libata")) {
struct resource *conflict, res;
res.start = ATA_SECONDARY_CMD;
res.end = ATA_SECONDARY_CMD + 8 - 1;
conflict = ____request_resource(&ioport_resource, &res);
while (conflict->child)
conflict = ____request_resource(conflict, &res);
if (!strcmp(conflict->name, "libata"))
legacy_mode |= ATA_PORT_SECONDARY;
else {
disable_dev_on_err = 0;
printk(KERN_WARNING "ata: 0x%X IDE port busy\n" \
"ata: conflict with %s\n",
ATA_SECONDARY_CMD,
conflict->name);
}
} else
legacy_mode |= ATA_PORT_SECONDARY;
if (legacy_mode & ATA_PORT_PRIMARY)
pci_request_region(pdev, 1, DRV_NAME);
if (legacy_mode & ATA_PORT_SECONDARY)
pci_request_region(pdev, 3, DRV_NAME);
/* If there is a DMA resource, allocate it */
pci_request_region(pdev, 4, DRV_NAME);
}
/* we have legacy mode, but all ports are unavailable */
if (legacy_mode == (1 << 3)) {
rc = -EBUSY;
goto err_out_regions;
}
/* TODO: If we get no DMA mask we should fall back to PIO */
rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
goto err_out_regions;
rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
goto err_out_regions;
if (legacy_mode) {
probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);
} else {
if (n_ports == 2)
probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
else
probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
}
if (!probe_ent) {
rc = -ENOMEM;
goto err_out_regions;
}
pci_set_master(pdev);
if (!ata_device_add(probe_ent)) {
rc = -ENODEV;
goto err_out_ent;
}
kfree(probe_ent);
return 0;
err_out_ent:
kfree(probe_ent);
err_out_regions:
/* All this conditional stuff is needed for the combined mode hack
until 2.6.21 when it can go */
if (legacy_mode) {
pci_release_region(pdev, 4);
if (legacy_mode & ATA_PORT_PRIMARY) {
release_region(ATA_PRIMARY_CMD, 8);
pci_release_region(pdev, 1);
}
if (legacy_mode & ATA_PORT_SECONDARY) {
release_region(ATA_SECONDARY_CMD, 8);
pci_release_region(pdev, 3);
}
} else
pci_release_regions(pdev);
err_out:
if (disable_dev_on_err)
pci_disable_device(pdev);
return rc;
}
/**
* ata_pci_clear_simplex - attempt to kick device out of simplex
* @pdev: PCI device
*
* Some PCI ATA devices report simplex mode but in fact can be told to
* enter non simplex mode. This implements the neccessary logic to
* perform the task on such devices. Calling it on other devices will
* have -undefined- behaviour.
*/
int ata_pci_clear_simplex(struct pci_dev *pdev)
{
unsigned long bmdma = pci_resource_start(pdev, 4);
u8 simplex;
if (bmdma == 0)
return -ENOENT;
simplex = inb(bmdma + 0x02);
outb(simplex & 0x60, bmdma + 0x02);
simplex = inb(bmdma + 0x02);
if (simplex & 0x80)
return -EOPNOTSUPP;
return 0;
}
unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long xfer_mask)
{
/* Filter out DMA modes if the device has been configured by
the BIOS as PIO only */
if (ap->ioaddr.bmdma_addr == 0)
xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
return xfer_mask;
}
#endif /* CONFIG_PCI */