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/*
* pata_triflex.c - Compaq PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* based upon
*
* triflex.c
*
* IDE Chipset driver for the Compaq TriFlex IDE controller.
*
* Known to work with the Compaq Workstation 5x00 series.
*
* Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
* Author: Torben Mathiasen <torben.mathiasen@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Loosely based on the piix & svwks drivers.
*
* Documentation:
* Not publicly available.
*/
#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_triflex"
#define DRV_VERSION "0.2.8"
/**
* triflex_prereset - probe begin
* @link: ATA link
* @deadline: deadline jiffies for the operation
*
* Set up cable type and use generic probe init
*/
static int triflex_prereset(struct ata_link *link, unsigned long deadline)
{
static const struct pci_bits triflex_enable_bits[] = {
{ 0x80, 1, 0x01, 0x01 },
{ 0x80, 1, 0x02, 0x02 }
};
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* triflex_load_timing - timing configuration
* @ap: ATA interface
* @adev: Device on the bus
* @speed: speed to configure
*
* The Triflex has one set of timings per device per channel. This
* means we must do some switching. As the PIO and DMA timings don't
* match we have to do some reloading unlike PIIX devices where tuning
* tricks can avoid it.
*/
static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 timing = 0;
u32 triflex_timing, old_triflex_timing;
int channel_offset = ap->port_no ? 0x74: 0x70;
unsigned int is_slave = (adev->devno != 0);
pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
triflex_timing = old_triflex_timing;
switch(speed)
{
case XFER_MW_DMA_2:
timing = 0x0103;break;
case XFER_MW_DMA_1:
timing = 0x0203;break;
case XFER_MW_DMA_0:
timing = 0x0808;break;
case XFER_SW_DMA_2:
case XFER_SW_DMA_1:
case XFER_SW_DMA_0:
timing = 0x0F0F;break;
case XFER_PIO_4:
timing = 0x0202;break;
case XFER_PIO_3:
timing = 0x0204;break;
case XFER_PIO_2:
timing = 0x0404;break;
case XFER_PIO_1:
timing = 0x0508;break;
case XFER_PIO_0:
timing = 0x0808;break;
default:
BUG();
}
triflex_timing &= ~ (0xFFFF << (16 * is_slave));
triflex_timing |= (timing << (16 * is_slave));
if (triflex_timing != old_triflex_timing)
pci_write_config_dword(pdev, channel_offset, triflex_timing);
}
/**
* triflex_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Use the timing loader to set up the PIO mode. We have to do this
* because DMA start/stop will only be called once DMA occurs. If there
* has been no DMA then the PIO timings are still needed.
*/
static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
triflex_load_timing(ap, adev, adev->pio_mode);
}
/**
* triflex_dma_start - DMA start callback
* @qc: Command in progress
*
* Usually drivers set the DMA timing at the point the set_dmamode call
* is made. Triflex however requires we load new timings on the
* transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
* We load the DMA timings just before starting DMA and then restore
* the PIO timing when the DMA is finished.
*/
static void triflex_bmdma_start(struct ata_queued_cmd *qc)
{
triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
ata_bmdma_start(qc);
}
/**
* triflex_dma_stop - DMA stop callback
* @ap: ATA interface
* @adev: ATA device
*
* We loaded new timings in dma_start, as a result we need to restore
* the PIO timings in dma_stop so that the next command issue gets the
* right clock values.
*/
static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
{
ata_bmdma_stop(qc);
triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
}
static struct scsi_host_template triflex_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations triflex_port_ops = {
.inherits = &ata_bmdma_port_ops,
.bmdma_start = triflex_bmdma_start,
.bmdma_stop = triflex_bmdma_stop,
.cable_detect = ata_cable_40wire,
.set_piomode = triflex_set_piomode,
.prereset = triflex_prereset,
};
static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &triflex_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
static int printed_version;
if (!printed_version++)
dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
}
static const struct pci_device_id triflex[] = {
{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
{ },
};
static struct pci_driver triflex_pci_driver = {
.name = DRV_NAME,
.id_table = triflex,
.probe = triflex_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init triflex_init(void)
{
return pci_register_driver(&triflex_pci_driver);
}
static void __exit triflex_exit(void)
{
pci_unregister_driver(&triflex_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, triflex);
MODULE_VERSION(DRV_VERSION);
module_init(triflex_init);
module_exit(triflex_exit);
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