206 lines
5.0 KiB
C
206 lines
5.0 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/init.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 "0.2.2"
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/**
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* rz1000_prereset - probe begin
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* @ap: ATA port
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*
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* Set up cable type and use generics
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*/
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static int rz1000_prereset(struct ata_port *ap)
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{
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ap->cbl = ATA_CBL_PATA40;
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return ata_std_prereset(ap);
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}
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/**
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* rz1000_error_handler - probe reset
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* @ap: ATA port
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*
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* Perform the ATA standard reset sequence
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*/
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static void rz1000_error_handler(struct ata_port *ap)
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{
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ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
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}
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/**
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* rz1000_set_mode - mode setting function
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* @ap: ATA interface
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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 void rz1000_set_mode(struct ata_port *ap)
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{
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int i;
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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struct ata_device *dev = &ap->device[i];
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if (ata_dev_enabled(dev)) {
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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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}
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}
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}
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static struct scsi_host_template rz1000_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.max_sectors = ATA_MAX_SECTORS,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.bios_param = ata_std_bios_param,
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};
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static struct ata_port_operations rz1000_port_ops = {
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.set_mode = rz1000_set_mode,
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.port_disable = ata_port_disable,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.error_handler = rz1000_error_handler,
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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ata_pio_data_xfer,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = rz1000_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.port_start = ata_port_start,
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.port_stop = ata_port_stop,
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.host_stop = ata_host_stop
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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 int printed_version;
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struct ata_port_info *port_info[2];
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u16 reg;
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static struct ata_port_info info = {
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.sht = &rz1000_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.port_ops = &rz1000_port_ops
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};
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if (!printed_version++)
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printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
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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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goto fail;
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reg &= 0xDFFF;
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if (pci_write_config_word(pdev, 0x40, reg) != 0)
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goto fail;
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printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
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port_info[0] = &info;
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port_info[1] = &info;
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return ata_pci_init_one(pdev, port_info, 2);
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fail:
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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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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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};
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static int __init rz1000_init(void)
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{
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return pci_register_driver(&rz1000_pci_driver);
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}
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static void __exit rz1000_exit(void)
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{
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pci_unregister_driver(&rz1000_pci_driver);
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}
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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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module_init(rz1000_init);
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module_exit(rz1000_exit);
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