linux/drivers/ata/pata_ns87410.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

239 lines
6.3 KiB
C

/*
* pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer
* (C) 2006 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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_ns87410"
#define DRV_VERSION "0.4.6"
/**
* ns87410_pre_reset - probe begin
* @ap: ATA port
* @deadline: deadline jiffies for the operation
*
* Check enabled ports
*/
static int ns87410_pre_reset(struct ata_port *ap, unsigned long deadline)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits ns87410_enable_bits[] = {
{ 0x43, 1, 0x08, 0x08 },
{ 0x47, 1, 0x08, 0x08 }
};
if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
return -ENOENT;
return ata_std_prereset(ap, deadline);
}
/**
* ns87410_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 ns87410_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* ns87410_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program timing data. This is kept per channel not per device,
* and only affects the data port.
*/
static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = 0x40 + 4 * ap->port_no;
u8 idetcr, idefr;
struct ata_timing at;
static const u8 activebits[15] = {
0, 1, 2, 3, 4,
5, 5, 6, 6, 6,
6, 7, 7, 7, 7
};
static const u8 recoverbits[12] = {
0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
};
pci_read_config_byte(pdev, port + 3, &idefr);
if (ata_pio_need_iordy(adev))
idefr |= 0x04; /* IORDY enable */
else
idefr &= ~0x04;
if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
return;
}
at.active = FIT(at.active, 2, 16) - 2;
at.setup = FIT(at.setup, 1, 4) - 1;
at.recover = FIT(at.recover, 1, 12) - 1;
idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
pci_write_config_byte(pdev, port, idetcr);
pci_write_config_byte(pdev, port + 3, idefr);
/* We use ap->private_data as a pointer to the device currently
loaded for timing */
ap->private_data = adev;
}
/**
* ns87410_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.
*/
static unsigned int ns87410_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)
ns87410_set_piomode(ap, adev);
return ata_qc_issue_prot(qc);
}
static struct scsi_host_template ns87410_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 ns87410_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ns87410_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 = ns87410_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = ata_cable_40wire,
.qc_prep = ata_qc_prep,
.qc_issue = ns87410_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,
};
static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.sht = &ns87410_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x0F,
.port_ops = &ns87410_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
return ata_pci_init_one(dev, ppi);
}
static const struct pci_device_id ns87410[] = {
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
{ },
};
static struct pci_driver ns87410_pci_driver = {
.name = DRV_NAME,
.id_table = ns87410,
.probe = ns87410_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init ns87410_init(void)
{
return pci_register_driver(&ns87410_pci_driver);
}
static void __exit ns87410_exit(void)
{
pci_unregister_driver(&ns87410_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ns87410);
MODULE_VERSION(DRV_VERSION);
module_init(ns87410_init);
module_exit(ns87410_exit);