linux/drivers/ata/pata_mpiix.c
Tejun Heo cbcdd87593 libata: implement and use ata_port_desc() to report port configuration
Currently, port configuration reporting has the following problems.

* iomapped address is reported instead of raw address
* report contains irrelevant fields or lacks necessary fields for
  non-SFF controllers.
* host->irq/irq2 are there just for reporting and hacky.

This patch implements and uses ata_port_desc() and
ata_port_pbar_desc().  ata_port_desc() is almost identical to
ata_ehi_push_desc() except that it takes @ap instead of @ehi, has no
locking requirement, can only be used during host initialization and "
" is used as separator instead of ", ".  ata_port_pbar_desc() is a
helper to ease reporting of a PCI BAR or an offsetted address into it.

LLD pushes whatever description it wants using the above two
functions.  The accumulated description is printed on host
registration after "[S/P]ATA max MAX_XFERMODE ".

SFF init helpers and ata_host_activate() automatically add
descriptions for addresses and irq respectively, so only LLDs which
isn't standard SFF need to add custom descriptions.  In many cases,
such controllers need to report different things anyway.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-10-12 14:55:37 -04:00

297 lines
8.4 KiB
C

/*
* pata_mpiix.c - Intel MPIIX PATA for new ATA layer
* (C) 2005-2006 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* The MPIIX is different enough to the PIIX4 and friends that we give it
* a separate driver. The old ide/pci code handles this by just not tuning
* MPIIX at all.
*
* The MPIIX also differs in another important way from the majority of PIIX
* devices. The chip is a bridge (pardon the pun) between the old world of
* ISA IDE and PCI IDE. Although the ATA timings are PCI configured the actual
* IDE controller is not decoded in PCI space and the chip does not claim to
* be IDE class PCI. This requires slightly non-standard probe logic compared
* with PCI IDE and also that we do not disable the device when our driver is
* unloaded (as it has many other functions).
*
* The driver conciously keeps this logic internally to avoid pushing quirky
* PATA history into the clean libata layer.
*
* Thinkpad specific note: If you boot an MPIIX using a thinkpad with a PCMCIA
* hard disk present this driver will not detect it. This is not a bug. In this
* configuration the secondary port of the MPIIX is disabled and the addresses
* are decoded by the PCMCIA bridge and therefore are for a generic IDE driver
* to operate.
*/
#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_mpiix"
#define DRV_VERSION "0.7.6"
enum {
IDETIM = 0x6C, /* IDE control register */
IORDY = (1 << 1),
PPE = (1 << 2),
FTIM = (1 << 0),
ENABLED = (1 << 15),
SECONDARY = (1 << 14)
};
static int mpiix_pre_reset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits mpiix_enable_bits = { 0x6D, 1, 0x80, 0x80 };
if (!pci_test_config_bits(pdev, &mpiix_enable_bits))
return -ENOENT;
return ata_std_prereset(link, deadline);
}
/**
* mpiix_error_handler - probe reset
* @ap: ATA port
*
* Perform the ATA probe and bus reset sequence plus specific handling
* for this hardware. The MPIIX has the enable bits in a different place
* to PIIX4 and friends. As a pure PIO device it has no cable detect
*/
static void mpiix_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, mpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* mpiix_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. The MPIIX allows us to program the
* IORDY sample point (2-5 clocks), recovery (1-4 clocks) and whether
* prefetching or IORDY are used.
*
* This would get very ugly because we can only program timing for one
* device at a time, the other gets PIO0. Fortunately libata calls
* our qc_issue_prot command before a command is issued so we can
* flip the timings back and forth to reduce the pain.
*/
static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
int control = 0;
int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u16 idetim;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
pci_read_config_word(pdev, IDETIM, &idetim);
/* Mask the IORDY/TIME/PPE for this device */
if (adev->class == ATA_DEV_ATA)
control |= PPE; /* Enable prefetch/posting for disk */
if (ata_pio_need_iordy(adev))
control |= IORDY;
if (pio > 1)
control |= FTIM; /* This drive is on the fast timing bank */
/* Mask out timing and clear both TIME bank selects */
idetim &= 0xCCEE;
idetim &= ~(0x07 << (4 * adev->devno));
idetim |= control << (4 * adev->devno);
idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
pci_write_config_word(pdev, IDETIM, idetim);
/* We use ap->private_data as a pointer to the device currently
loaded for timing */
ap->private_data = adev;
}
/**
* mpiix_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 mpiix_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
/* If modes have been configured and the channel data is not loaded
then load it. We have to check if pio_mode is set as the core code
does not set adev->pio_mode to XFER_PIO_0 while probing as would be
logical */
if (adev->pio_mode && adev != ap->private_data)
mpiix_set_piomode(ap, adev);
return ata_qc_issue_prot(qc);
}
static struct scsi_host_template mpiix_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 mpiix_port_ops = {
.set_piomode = mpiix_set_piomode,
.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 = mpiix_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = ata_cable_40wire,
.qc_prep = ata_qc_prep,
.qc_issue = mpiix_qc_issue_prot,
.data_xfer = ata_data_xfer,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.port_start = ata_sff_port_start,
};
static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
/* Single threaded by the PCI probe logic */
static int printed_version;
struct ata_host *host;
struct ata_port *ap;
void __iomem *cmd_addr, *ctl_addr;
u16 idetim;
int cmd, ctl, irq;
if (!printed_version++)
dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
host = ata_host_alloc(&dev->dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
/* MPIIX has many functions which can be turned on or off according
to other devices present. Make sure IDE is enabled before we try
and use it */
pci_read_config_word(dev, IDETIM, &idetim);
if (!(idetim & ENABLED))
return -ENODEV;
/* See if it's primary or secondary channel... */
if (!(idetim & SECONDARY)) {
cmd = 0x1F0;
ctl = 0x3F6;
irq = 14;
} else {
cmd = 0x170;
ctl = 0x376;
irq = 15;
}
cmd_addr = devm_ioport_map(&dev->dev, cmd, 8);
ctl_addr = devm_ioport_map(&dev->dev, ctl, 1);
if (!cmd_addr || !ctl_addr)
return -ENOMEM;
ata_port_desc(ap, "cmd 0x%x ctl 0x%x", cmd, ctl);
/* We do our own plumbing to avoid leaking special cases for whacko
ancient hardware into the core code. There are two issues to
worry about. #1 The chip is a bridge so if in legacy mode and
without BARs set fools the setup. #2 If you pci_disable_device
the MPIIX your box goes castors up */
ap->ops = &mpiix_port_ops;
ap->pio_mask = 0x1F;
ap->flags |= ATA_FLAG_SLAVE_POSS;
ap->ioaddr.cmd_addr = cmd_addr;
ap->ioaddr.ctl_addr = ctl_addr;
ap->ioaddr.altstatus_addr = ctl_addr;
/* Let libata fill in the port details */
ata_std_ports(&ap->ioaddr);
/* activate host */
return ata_host_activate(host, irq, ata_interrupt, IRQF_SHARED,
&mpiix_sht);
}
static const struct pci_device_id mpiix[] = {
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX), },
{ },
};
static struct pci_driver mpiix_pci_driver = {
.name = DRV_NAME,
.id_table = mpiix,
.probe = mpiix_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init mpiix_init(void)
{
return pci_register_driver(&mpiix_pci_driver);
}
static void __exit mpiix_exit(void)
{
pci_unregister_driver(&mpiix_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Intel MPIIX");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, mpiix);
MODULE_VERSION(DRV_VERSION);
module_init(mpiix_init);
module_exit(mpiix_exit);