/*
* 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 "0.2.3"
/**
* rz1000_prereset - probe begin
* @ap: ATA port
*
* Set up cable type and use generics
*/
static int rz1000_prereset(struct ata_port *ap)
{
ap->cbl = ATA_CBL_PATA40;
return ata_std_prereset(ap);
}
/**
* rz1000_error_handler - probe reset
* @ap: ATA port
*
* Perform the ATA standard reset sequence
*/
static void rz1000_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* rz1000_set_mode - mode setting function
* @ap: ATA interface
*
* 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 void rz1000_set_mode(struct ata_port *ap)
{
int i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
if (ata_dev_enabled(dev)) {
/* 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;
}
}
}
static struct scsi_host_template rz1000_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
};
static struct ata_port_operations rz1000_port_ops = {
.set_mode = rz1000_set_mode,
.port_disable = ata_port_disable,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.error_handler = rz1000_error_handler,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = rz1000_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
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;
struct ata_port_info *port_info[2];
static struct ata_port_info info = {
.sht = &rz1000_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.port_ops = &rz1000_port_ops
};
if (!printed_version++)
printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
if (rz1000_fifo_disable(pdev) == 0) {
port_info[0] = &info;
port_info[1] = &info;
return ata_pci_init_one(pdev, port_info, 2);
}
printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
/* Not safe to use so skip */
return -ENODEV;
}
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);
}
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,
.suspend = ata_pci_device_suspend,
.resume = rz1000_reinit_one,
};
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);
