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// SPDX-License-Identifier: GPL-2.0-only
/*
* RZ1000/1001 driver based upon
*
* linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003
* Copyright (C) 1995-1998 Linus Torvalds & author (see below)
* Principal Author: mlord@pobox.com (Mark Lord)
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This file provides support for disabling the buggy read-ahead
* mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_rz1000"
#define DRV_VERSION "0.2.4"
/**
* rz1000_set_mode - mode setting function
* @link: ATA link
* @unused: returned device on set_mode failure
*
* Use a non standard set_mode function. We don't want to be tuned. We
* would prefer to be BIOS generic but for the fact our hardware is
* whacked out.
*/
static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
{
struct ata_device *dev;
ata_for_each_dev(dev, link, ENABLED) {
/* We don't really care */
dev->pio_mode = XFER_PIO_0;
dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
ata_dev_info(dev, "configured for PIO\n");
}
return 0;
}
static const struct scsi_host_template rz1000_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations rz1000_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
.set_mode = rz1000_set_mode,
};
static int rz1000_fifo_disable(struct pci_dev *pdev)
{
u16 reg;
/* Be exceptionally paranoid as we must be sure to apply the fix */
if (pci_read_config_word(pdev, 0x40, ®) != 0)
return -1;
reg &= 0xDFFF;
if (pci_write_config_word(pdev, 0x40, reg) != 0)
return -1;
dev_info(&pdev->dev, "disabled chipset readahead.\n");
return 0;
}
/**
* rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in rz1000_pci_tbl matching with @pdev
*
* Configure an RZ1000 interface. This doesn't require much special
* handling except that we *MUST* kill the chipset readahead or the
* user may experience data corruption.
*/
static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.port_ops = &rz1000_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
ata_print_version_once(&pdev->dev, DRV_VERSION);
if (rz1000_fifo_disable(pdev) == 0)
return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);
dev_err(&pdev->dev, "failed to disable read-ahead on chipset.\n");
/* Not safe to use so skip */
return -ENODEV;
}
#ifdef CONFIG_PM_SLEEP
static int rz1000_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = pci_get_drvdata(pdev);
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
/* If this fails on resume (which is a "can't happen" case), we
must stop as any progress risks data loss */
if (rz1000_fifo_disable(pdev))
panic("rz1000 fifo");
ata_host_resume(host);
return 0;
}
#endif
static const struct pci_device_id pata_rz1000[] = {
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
{ },
};
static struct pci_driver rz1000_pci_driver = {
.name = DRV_NAME,
.id_table = pata_rz1000,
.probe = rz1000_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.suspend = ata_pci_device_suspend,
.resume = rz1000_reinit_one,
#endif
};
module_pci_driver(rz1000_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_rz1000);
MODULE_VERSION(DRV_VERSION);
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