diff options
Diffstat (limited to 'drivers/ata/pata_rz1000.c')
| -rw-r--r-- | drivers/ata/pata_rz1000.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/ata/pata_rz1000.c b/drivers/ata/pata_rz1000.c new file mode 100644 index 000000000..fb00c3e5f --- /dev/null +++ b/drivers/ata/pata_rz1000.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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/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_info(dev, "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; + dev_info(&pdev->dev, "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 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 }; + + ata_print_version_once(&pdev->dev, DRV_VERSION); + + if (rz1000_fifo_disable(pdev) == 0) + return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0); + + dev_err(&pdev->dev, "failed to disable read-ahead on chipset.\n"); + /* Not safe to use so skip */ + return -ENODEV; +} + +#ifdef CONFIG_PM_SLEEP +static int rz1000_reinit_one(struct pci_dev *pdev) +{ + struct ata_host *host = pci_get_drvdata(pdev); + int rc; + + rc = ata_pci_device_do_resume(pdev); + if (rc) + return rc; + + /* If this fails on resume (which is a "can't happen" case), we + must stop as any progress risks data loss */ + if (rz1000_fifo_disable(pdev)) + panic("rz1000 fifo"); + + ata_host_resume(host); + return 0; +} +#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_SLEEP + .suspend = ata_pci_device_suspend, + .resume = rz1000_reinit_one, +#endif +}; + +module_pci_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); |