linux/drivers/ata/pata_acpi.c

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/*
* ACPI PATA driver
*
* (c) 2007 Red Hat
*/
#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 <acpi/acpi_bus.h>
#include <linux/libata.h>
#include <linux/ata.h>
#define DRV_NAME "pata_acpi"
#define DRV_VERSION "0.2.3"
struct pata_acpi {
struct ata_acpi_gtm gtm;
void *last;
unsigned long mask[2];
};
/**
* pacpi_pre_reset - check for 40/80 pin
* @ap: Port
* @deadline: deadline jiffies for the operation
*
* Perform the PATA port setup we need.
*/
static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pata_acpi *acpi = ap->private_data;
if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
return -ENODEV;
return ata_sff_prereset(link, deadline);
}
/**
* pacpi_cable_detect - cable type detection
* @ap: port to detect
*
* Perform device specific cable detection
*/
static int pacpi_cable_detect(struct ata_port *ap)
{
struct pata_acpi *acpi = ap->private_data;
if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* pacpi_discover_modes - filter non ACPI modes
* @adev: ATA device
* @mask: proposed modes
*
* Try the modes available and see which ones the ACPI method will
* set up sensibly. From this we get a mask of ACPI modes we can use
*/
static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
{
struct pata_acpi *acpi = ap->private_data;
struct ata_acpi_gtm probe;
unsigned int xfer_mask;
probe = acpi->gtm;
ata_acpi_gtm(ap, &probe);
xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
ap->cbl = ATA_CBL_PATA80;
return xfer_mask;
}
/**
* pacpi_mode_filter - mode filter for ACPI
* @adev: device
* @mask: mask of valid modes
*
* Filter the valid mode list according to our own specific rules, in
* this case the list of discovered valid modes obtained by ACPI probing
*/
static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
{
struct pata_acpi *acpi = adev->link->ap->private_data;
return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
}
/**
* pacpi_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*/
static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
int unit = adev->devno;
struct pata_acpi *acpi = ap->private_data;
const struct ata_timing *t;
if (!(acpi->gtm.flags & 0x10))
unit = 0;
/* Now stuff the nS values into the structure */
t = ata_timing_find_mode(adev->pio_mode);
acpi->gtm.drive[unit].pio = t->cycle;
ata_acpi_stm(ap, &acpi->gtm);
/* See what mode we actually got */
ata_acpi_gtm(ap, &acpi->gtm);
}
/**
* pacpi_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*/
static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
int unit = adev->devno;
struct pata_acpi *acpi = ap->private_data;
const struct ata_timing *t;
if (!(acpi->gtm.flags & 0x10))
unit = 0;
/* Now stuff the nS values into the structure */
t = ata_timing_find_mode(adev->dma_mode);
if (adev->dma_mode >= XFER_UDMA_0) {
acpi->gtm.drive[unit].dma = t->udma;
acpi->gtm.flags |= (1 << (2 * unit));
} else {
acpi->gtm.drive[unit].dma = t->cycle;
acpi->gtm.flags &= ~(1 << (2 * unit));
}
ata_acpi_stm(ap, &acpi->gtm);
/* See what mode we actually got */
ata_acpi_gtm(ap, &acpi->gtm);
}
/**
* pacpi_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.
*/
static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct pata_acpi *acpi = ap->private_data;
if (acpi->gtm.flags & 0x10)
return ata_sff_qc_issue(qc);
if (adev != acpi->last) {
pacpi_set_piomode(ap, adev);
if (ata_dma_enabled(adev))
pacpi_set_dmamode(ap, adev);
acpi->last = adev;
}
return ata_sff_qc_issue(qc);
}
/**
* pacpi_port_start - port setup
* @ap: ATA port being set up
*
* Use the port_start hook to maintain private control structures
*/
static int pacpi_port_start(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct pata_acpi *acpi;
int ret;
if (ap->acpi_handle == NULL)
return -ENODEV;
acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
if (ap->private_data == NULL)
return -ENOMEM;
acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
ret = ata_sff_port_start(ap);
if (ret < 0)
return ret;
return ret;
}
static struct scsi_host_template pacpi_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
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 03:22:49 +00:00
static struct ata_port_operations pacpi_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_issue = pacpi_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 03:22:49 +00:00
.cable_detect = pacpi_cable_detect,
.mode_filter = pacpi_mode_filter,
.set_piomode = pacpi_set_piomode,
.set_dmamode = pacpi_set_dmamode,
.prereset = pacpi_pre_reset,
.port_start = pacpi_port_start,
};
/**
* pacpi_init_one - Register ACPI ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in pacpi_pci_tbl matching with @pdev
*
* Called from kernel PCI layer.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &pacpi_ops,
};
const struct ata_port_info *ppi[] = { &info, NULL };
if (pdev->vendor == PCI_VENDOR_ID_ATI) {
int rc = pcim_enable_device(pdev);
if (rc < 0)
return rc;
pcim_pin_device(pdev);
}
return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
}
static const struct pci_device_id pacpi_pci_tbl[] = {
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
{ } /* terminate list */
};
static struct pci_driver pacpi_pci_driver = {
.name = DRV_NAME,
.id_table = pacpi_pci_tbl,
.probe = pacpi_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init pacpi_init(void)
{
return pci_register_driver(&pacpi_pci_driver);
}
static void __exit pacpi_exit(void)
{
pci_unregister_driver(&pacpi_pci_driver);
}
module_init(pacpi_init);
module_exit(pacpi_exit);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
MODULE_VERSION(DRV_VERSION);