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