linux/drivers/ata/pata_sl82c105.c
Auke Kok 44c10138fd PCI: Change all drivers to use pci_device->revision
Instead of all drivers reading pci config space to get the revision
ID, they can now use the pci_device->revision member.

This exposes some issues where drivers where reading a word or a dword
for the revision number, and adding useless error-handling around the
read. Some drivers even just read it for no purpose of all.

In devices where the revision ID is being copied over and used in what
appears to be the equivalent of hotpath, I have left the copy code
and the cached copy as not to influence the driver's performance.

Compile tested with make all{yes,mod}config on x86_64 and i386.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Acked-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-11 16:02:10 -07:00

366 lines
9.3 KiB
C

/*
* pata_sl82c105.c - SL82C105 PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* Based in part on linux/drivers/ide/pci/sl82c105.c
* SL82C105/Winbond 553 IDE driver
*
* and in part on the documentation and errata sheet
*
*
* Note: The controller like many controllers has shared timings for
* PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
* in the dma_stop function. Thus we actually don't need a set_dmamode
* method as the PIO method is always called and will set the right PIO
* timing parameters.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_sl82c105"
#define DRV_VERSION "0.3.1"
enum {
/*
* SL82C105 PCI config register 0x40 bits.
*/
CTRL_IDE_IRQB = (1 << 30),
CTRL_IDE_IRQA = (1 << 28),
CTRL_LEGIRQ = (1 << 11),
CTRL_P1F16 = (1 << 5),
CTRL_P1EN = (1 << 4),
CTRL_P0F16 = (1 << 1),
CTRL_P0EN = (1 << 0)
};
/**
* sl82c105_pre_reset - probe begin
* @ap: ATA port
* @deadline: deadline jiffies for the operation
*
* Set up cable type and use generic probe init
*/
static int sl82c105_pre_reset(struct ata_port *ap, unsigned long deadline)
{
static const struct pci_bits sl82c105_enable_bits[] = {
{ 0x40, 1, 0x01, 0x01 },
{ 0x40, 1, 0x10, 0x10 }
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
return -ENOENT;
return ata_std_prereset(ap, deadline);
}
static void sl82c105_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* sl82c105_configure_piomode - set chip PIO timing
* @ap: ATA interface
* @adev: ATA device
* @pio: PIO mode
*
* Called to do the PIO mode setup. Our timing registers are shared
* so a configure_dmamode call will undo any work we do here and vice
* versa
*/
static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static u16 pio_timing[5] = {
0x50D, 0x407, 0x304, 0x242, 0x240
};
u16 dummy;
int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
pci_write_config_word(pdev, timing, pio_timing[pio]);
/* Can we lose this oddity of the old driver */
pci_read_config_word(pdev, timing, &dummy);
}
/**
* sl82c105_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. Our timing registers are shared
* but we want to set the PIO timing by default.
*/
static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
}
/**
* sl82c105_configure_dmamode - set DMA mode in chip
* @ap: ATA interface
* @adev: ATA device
*
* Load DMA cycle times into the chip ready for a DMA transfer
* to occur.
*/
static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static u16 dma_timing[3] = {
0x707, 0x201, 0x200
};
u16 dummy;
int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
int dma = adev->dma_mode - XFER_MW_DMA_0;
pci_write_config_word(pdev, timing, dma_timing[dma]);
/* Can we lose this oddity of the old driver */
pci_read_config_word(pdev, timing, &dummy);
}
/**
* sl82c105_reset_engine - Reset the DMA engine
* @ap: ATA interface
*
* The sl82c105 has some serious problems with the DMA engine
* when transfers don't run as expected or ATAPI is used. The
* recommended fix is to reset the engine each use using a chip
* test register.
*/
static void sl82c105_reset_engine(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u16 val;
pci_read_config_word(pdev, 0x7E, &val);
pci_write_config_word(pdev, 0x7E, val | 4);
pci_write_config_word(pdev, 0x7E, val & ~4);
}
/**
* sl82c105_bmdma_start - DMA engine begin
* @qc: ATA command
*
* Reset the DMA engine each use as recommended by the errata
* document.
*
* FIXME: if we switch clock at BMDMA start/end we might get better
* PIO performance on DMA capable devices.
*/
static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
udelay(100);
sl82c105_reset_engine(ap);
udelay(100);
/* Set the clocks for DMA */
sl82c105_configure_dmamode(ap, qc->dev);
/* Activate DMA */
ata_bmdma_start(qc);
}
/**
* sl82c105_bmdma_end - DMA engine stop
* @qc: ATA command
*
* Reset the DMA engine each use as recommended by the errata
* document.
*
* This function is also called to turn off DMA when a timeout occurs
* during DMA operation. In both cases we need to reset the engine,
* so no actual eng_timeout handler is required.
*
* We assume bmdma_stop is always called if bmdma_start as called. If
* not then we may need to wrap qc_issue.
*/
static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
ata_bmdma_stop(qc);
sl82c105_reset_engine(ap);
udelay(100);
/* This will redo the initial setup of the DMA device to matching
PIO timings */
sl82c105_set_piomode(ap, qc->dev);
}
static struct scsi_host_template sl82c105_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations sl82c105_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = sl82c105_set_piomode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = sl82c105_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = ata_cable_40wire,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = sl82c105_bmdma_start,
.bmdma_stop = sl82c105_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = ata_port_start,
};
/**
* sl82c105_bridge_revision - find bridge version
* @pdev: PCI device for the ATA function
*
* Locates the PCI bridge associated with the ATA function and
* providing it is a Winbond 553 reports the revision. If it cannot
* find a revision or the right device it returns -1
*/
static int sl82c105_bridge_revision(struct pci_dev *pdev)
{
struct pci_dev *bridge;
/*
* The bridge should be part of the same device, but function 0.
*/
bridge = pci_get_slot(pdev->bus,
PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
if (!bridge)
return -1;
/*
* Make sure it is a Winbond 553 and is an ISA bridge.
*/
if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
pci_dev_put(bridge);
return -1;
}
/*
* We need to find function 0's revision, not function 1
*/
pci_dev_put(bridge);
return bridge->revision;
}
static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info_dma = {
.sht = &sl82c105_sht,
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.port_ops = &sl82c105_port_ops
};
static const struct ata_port_info info_early = {
.sht = &sl82c105_sht,
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.port_ops = &sl82c105_port_ops
};
/* for now use only the first port */
const struct ata_port_info *ppi[] = { &info_early,
&ata_dummy_port_info };
u32 val;
int rev;
rev = sl82c105_bridge_revision(dev);
if (rev == -1)
dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
else if (rev <= 5)
dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
else
ppi[0] = &info_dma;
pci_read_config_dword(dev, 0x40, &val);
val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
pci_write_config_dword(dev, 0x40, val);
return ata_pci_init_one(dev, ppi);
}
static const struct pci_device_id sl82c105[] = {
{ PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },
{ },
};
static struct pci_driver sl82c105_pci_driver = {
.name = DRV_NAME,
.id_table = sl82c105,
.probe = sl82c105_init_one,
.remove = ata_pci_remove_one
};
static int __init sl82c105_init(void)
{
return pci_register_driver(&sl82c105_pci_driver);
}
static void __exit sl82c105_exit(void)
{
pci_unregister_driver(&sl82c105_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Sl82c105");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, sl82c105);
MODULE_VERSION(DRV_VERSION);
module_init(sl82c105_init);
module_exit(sl82c105_exit);