linux/drivers/ata/pata_oldpiix.c
Tejun Heo 1626aeb881 libata: clean up SFF init mess
The intention of using port_mask in SFF init helpers was to eventually
support exoctic configurations such as combination of legacy and
native port on the same controller.  This never became actually
necessary and the related code always has been subtly broken one way
or the other.  Now that new init model is in place, there is no reason
to make common helpers capable of handling all corner cases.  Exotic
cases can simply dealt within LLDs as necessary.

This patch removes port_mask handling in SFF init helpers.  SFF init
helpers don't take n_ports argument and interpret it into port_mask
anymore.  All information is carried via port_info.  n_ports argument
is dropped and always two ports are allocated.  LLD can tell SFF to
skip certain port by marking it dummy.  Note that SFF code has been
treating unuvailable ports this way for a long time until recent
breakage fix from Linus and is consistent with how other drivers
handle with unavailable ports.

This fixes 1-port legacy host handling still broken after the recent
native mode fix and simplifies SFF init logic.  The following changes
are made...

* ata_pci_init_native_host() and ata_init_legacy_host() both now try
  to initialized whatever they can and mark failed ports dummy.  They
  return 0 if any port is successfully initialized.

* ata_pci_prepare_native_host() and ata_pci_init_one() now doesn't
  take n_ports argument.  All info should be specified via port_info
  array.  Always two ports are allocated.

* ata_pci_init_bmdma() exported to be used by LLDs in exotic cases.

* port_info handling in all LLDs are standardized - all port_info
  arrays are const stack variable named ppi.  Unless the second port
  is different from the first, its port_info is specified as NULL
  (tells libata that it's identical to the last non-NULL port_info).

* pata_hpt37x/hpt3x2n: don't modify static variable directly.  Make an
  on-stack copy instead as ata_piix does.

* pata_uli: It has 4 ports instead of 2.  Don't use
  ata_pci_prepare_native_host().  Allocate the host explicitly and use
  init helpers.  It's simple enough.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-05-11 18:09:18 -04:00

344 lines
9.0 KiB
C

/*
* pata_oldpiix.c - Intel PATA/SATA controllers
*
* (C) 2005 Red Hat <alan@redhat.com>
*
* Some parts based on ata_piix.c by Jeff Garzik and others.
*
* Early PIIX differs significantly from the later PIIX as it lacks
* SITRE and the slave timing registers. This means that you have to
* set timing per channel, or be clever. Libata tells us whenever it
* does drive selection and we use this to reload the timings.
*
* Because of these behaviour differences PIIX gets its own driver module.
*/
#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 <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>
#define DRV_NAME "pata_oldpiix"
#define DRV_VERSION "0.5.5"
/**
* oldpiix_pre_reset - probe begin
* @ap: ATA port
* @deadline: deadline jiffies for the operation
*
* Set up cable type and use generic probe init
*/
static int oldpiix_pre_reset(struct ata_port *ap, unsigned long deadline)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits oldpiix_enable_bits[] = {
{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
{ 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
};
if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))
return -ENOENT;
return ata_std_prereset(ap, deadline);
}
/**
* oldpiix_pata_error_handler - Probe specified port on PATA host controller
* @ap: Port to probe
* @classes:
*
* LOCKING:
* None (inherited from caller).
*/
static void oldpiix_pata_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, oldpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* oldpiix_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device whose timings we are configuring
*
* Set PIO mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *dev = to_pci_dev(ap->host->dev);
unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
u16 idetm_data;
int control = 0;
/*
* See Intel Document 298600-004 for the timing programing rules
* for PIIX/ICH. Note that the early PIIX does not have the slave
* timing port at 0x44.
*/
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
if (pio > 1)
control |= 1; /* TIME */
if (ata_pio_need_iordy(adev))
control |= 2; /* IE */
/* Intel specifies that the prefetch/posting is for disk only */
if (adev->class == ATA_DEV_ATA)
control |= 4; /* PPE */
pci_read_config_word(dev, idetm_port, &idetm_data);
/*
* Set PPE, IE and TIME as appropriate.
* Clear the other drive's timing bits.
*/
if (adev->devno == 0) {
idetm_data &= 0xCCE0;
idetm_data |= control;
} else {
idetm_data &= 0xCC0E;
idetm_data |= (control << 4);
}
idetm_data |= (timings[pio][0] << 12) |
(timings[pio][1] << 8);
pci_write_config_word(dev, idetm_port, idetm_data);
/* Track which port is configured */
ap->private_data = adev;
}
/**
* oldpiix_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device to program
* @isich: True if the device is an ICH and has IOCFG registers
*
* Set MWDMA mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
u8 idetm_port = ap->port_no ? 0x42 : 0x40;
u16 idetm_data;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
/*
* MWDMA is driven by the PIO timings. We must also enable
* IORDY unconditionally along with TIME1. PPE has already
* been set when the PIO timing was set.
*/
unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
unsigned int control;
const unsigned int needed_pio[3] = {
XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
};
int pio = needed_pio[mwdma] - XFER_PIO_0;
pci_read_config_word(dev, idetm_port, &idetm_data);
control = 3; /* IORDY|TIME0 */
/* Intel specifies that the PPE functionality is for disk only */
if (adev->class == ATA_DEV_ATA)
control |= 4; /* PPE enable */
/* If the drive MWDMA is faster than it can do PIO then
we must force PIO into PIO0 */
if (adev->pio_mode < needed_pio[mwdma])
/* Enable DMA timing only */
control |= 8; /* PIO cycles in PIO0 */
/* Mask out the relevant control and timing bits we will load. Also
clear the other drive TIME register as a precaution */
if (adev->devno == 0) {
idetm_data &= 0xCCE0;
idetm_data |= control;
} else {
idetm_data &= 0xCC0E;
idetm_data |= (control << 4);
}
idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
pci_write_config_word(dev, idetm_port, idetm_data);
/* Track which port is configured */
ap->private_data = adev;
}
/**
* oldpiix_qc_issue_prot - command issue
* @qc: command pending
*
* Called when the libata layer is about to issue a command. We wrap
* this interface so that we can load the correct ATA timings if
* neccessary. Our logic also clears TIME0/TIME1 for the other device so
* that, even if we get this wrong, cycles to the other device will
* be made PIO0.
*/
static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
if (adev != ap->private_data) {
oldpiix_set_piomode(ap, adev);
if (adev->dma_mode)
oldpiix_set_dmamode(ap, adev);
}
return ata_qc_issue_prot(qc);
}
static struct scsi_host_template oldpiix_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 const struct ata_port_operations oldpiix_pata_ops = {
.port_disable = ata_port_disable,
.set_piomode = oldpiix_set_piomode,
.set_dmamode = oldpiix_set_dmamode,
.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 = oldpiix_pata_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = ata_cable_40wire,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = oldpiix_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,
};
/**
* oldpiix_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in oldpiix_pci_tbl matching with @pdev
*
* Called from kernel PCI layer. We probe for combined mode (sigh),
* and then hand over control to libata, for it to do the rest.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
static const struct ata_port_info info = {
.sht = &oldpiix_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma1-2 */
.port_ops = &oldpiix_pata_ops,
};
const struct ata_port_info *ppi[] = { &info, NULL };
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev,
"version " DRV_VERSION "\n");
return ata_pci_init_one(pdev, ppi);
}
static const struct pci_device_id oldpiix_pci_tbl[] = {
{ PCI_VDEVICE(INTEL, 0x1230), },
{ } /* terminate list */
};
static struct pci_driver oldpiix_pci_driver = {
.name = DRV_NAME,
.id_table = oldpiix_pci_tbl,
.probe = oldpiix_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init oldpiix_init(void)
{
return pci_register_driver(&oldpiix_pci_driver);
}
static void __exit oldpiix_exit(void)
{
pci_unregister_driver(&oldpiix_pci_driver);
}
module_init(oldpiix_init);
module_exit(oldpiix_exit);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
MODULE_VERSION(DRV_VERSION);