/* * 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/init.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_printk(dev, KERN_INFO, "configured for PIO\n"); } return 0; } static 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; printk(KERN_INFO DRV_NAME ": 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 int printed_version; 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 }; if (!printed_version++) printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); if (rz1000_fifo_disable(pdev) == 0) return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL); printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); /* Not safe to use so skip */ return -ENODEV; } #ifdef CONFIG_PM static int rz1000_reinit_one(struct pci_dev *pdev) { /* If this fails on resume (which is a "cant happen" case), we must stop as any progress risks data loss */ if (rz1000_fifo_disable(pdev)) panic("rz1000 fifo"); return ata_pci_device_resume(pdev); } #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 .suspend = ata_pci_device_suspend, .resume = rz1000_reinit_one, #endif }; static int __init rz1000_init(void) { return pci_register_driver(&rz1000_pci_driver); } static void __exit rz1000_exit(void) { pci_unregister_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); module_init(rz1000_init); module_exit(rz1000_exit);