linux/drivers/ata/pata_mpiix.c

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/*
* pata_mpiix.c - Intel MPIIX PATA for new ATA layer
* (C) 2005-2006 Red Hat Inc
* Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* 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 consciously 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 "0.7.7"
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;
libata: add deadline support to prereset and reset methods Add @deadline to prereset and reset methods and make them honor it. ata_wait_ready() which directly takes @deadline is implemented to be used as the wait function. This patch is in preparation for EH timing improvements. * ata_wait_ready() never does busy sleep. It's only used from EH and no wait in EH is that urgent. This function also prints 'be patient' message automatically after 5 secs of waiting if more than 3 secs is remaining till deadline. * ata_bus_post_reset() now fails with error code if any of its wait fails. This is important because earlier reset tries will have shorter timeout than the spec requires. If a device fails to respond before the short timeout, reset should be retried with longer timeout rather than silently ignoring the device. There are three behavior differences. 1. Timeout is applied to both devices at once, not separately. This is more consistent with what the spec says. 2. When a device passes devchk but fails to become ready before deadline. Previouly, post_reset would just succeed and let device classification remove the device. New code fails the reset thus causing reset retry. After a few times, EH will give up disabling the port. 3. When slave device passes devchk but fails to become accessible (TF-wise) after reset. Original code disables dev1 after 30s timeout and continues as if the device doesn't exist, while the patched code fails reset. When this happens, new code fails reset on whole port rather than proceeding with only the primary device. If the failing device is suffering transient problems, new code retries reset which is a better behavior. If the failing device is actually broken, the net effect is identical to it, but not to the other device sharing the channel. In the previous code, reset would have succeeded after 30s thus detecting the working one. In the new code, reset fails and whole port gets disabled. IMO, it's a pathological case anyway (broken device sharing bus with working one) and doesn't really matter. * ata_bus_softreset() is changed to return error code from ata_bus_post_reset(). It used to return 0 unconditionally. * Spin up waiting is to be removed and not converted to honor deadline. * To be on the safe side, deadline is set to 40s for the time being. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-02-02 08:50:52 +01:00
return ata_sff_prereset(link, deadline);
}
/**
* 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 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 - 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
* necessary. 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(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_sff_qc_issue(qc);
}
static struct scsi_host_template mpiix_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations mpiix_port_ops = {
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 04:22:49 +01:00
.inherits = &ata_sff_port_ops,
.qc_issue = mpiix_qc_issue,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 04:22:49 +01:00
.cable_detect = ata_cable_40wire,
.set_piomode = mpiix_set_piomode,
libata: make reset related methods proper port operations Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 04:22:50 +01:00
.prereset = mpiix_pre_reset,
.sff_data_xfer = ata_sff_data_xfer32,
};
static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
/* Single threaded by the PCI probe logic */
struct ata_host *host;
struct ata_port *ap;
void __iomem *cmd_addr, *ctl_addr;
u16 idetim;
int cmd, ctl, irq;
ata_print_version_once(&dev->dev, DRV_VERSION);
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 = ATA_PIO4;
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_sff_std_ports(&ap->ioaddr);
/* activate host */
return ata_host_activate(host, irq, ata_sff_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
};
module_pci_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);