diff options
Diffstat (limited to 'drivers/ide/rz1000.c')
| -rw-r--r-- | drivers/ide/rz1000.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/ide/rz1000.c b/drivers/ide/rz1000.c new file mode 100644 index 000000000..fce2b7de5 --- /dev/null +++ b/drivers/ide/rz1000.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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. + * + * Dunno if this fixes both ports, or only the primary port (?). + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/ide.h> +#include <linux/init.h> + +#define DRV_NAME "rz1000" + +static int rz1000_disable_readahead(struct pci_dev *dev) +{ + u16 reg; + + if (!pci_read_config_word (dev, 0x40, ®) && + !pci_write_config_word(dev, 0x40, reg & 0xdfff)) { + printk(KERN_INFO "%s: disabled chipset read-ahead " + "(buggy RZ1000/RZ1001)\n", pci_name(dev)); + return 0; + } else { + printk(KERN_INFO "%s: serialized, disabled unmasking " + "(buggy RZ1000/RZ1001)\n", pci_name(dev)); + return 1; + } +} + +static const struct ide_port_info rz1000_chipset = { + .name = DRV_NAME, + .host_flags = IDE_HFLAG_NO_DMA, +}; + +static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + struct ide_port_info d = rz1000_chipset; + int rc; + + rc = pci_enable_device(dev); + if (rc) + return rc; + + if (rz1000_disable_readahead(dev)) { + d.host_flags |= IDE_HFLAG_SERIALIZE; + d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS; + } + + return ide_pci_init_one(dev, &d, NULL); +} + +static void rz1000_remove(struct pci_dev *dev) +{ + ide_pci_remove(dev); + pci_disable_device(dev); +} + +static const struct pci_device_id rz1000_pci_tbl[] = { + { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 }, + { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 }, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl); + +static struct pci_driver rz1000_pci_driver = { + .name = "RZ1000_IDE", + .id_table = rz1000_pci_tbl, + .probe = rz1000_init_one, + .remove = rz1000_remove, +}; + +static int __init rz1000_ide_init(void) +{ + return ide_pci_register_driver(&rz1000_pci_driver); +} + +static void __exit rz1000_ide_exit(void) +{ + pci_unregister_driver(&rz1000_pci_driver); +} + +module_init(rz1000_ide_init); +module_exit(rz1000_ide_exit); + +MODULE_AUTHOR("Andre Hedrick"); +MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE"); +MODULE_LICENSE("GPL"); + |