/* * 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_set_mode - mode setting function * @ap: ATA interface * @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_port *ap, struct ata_device **unused) { int i; for (i = 0; i < ATA_MAX_DEVICES; i++) { struct ata_device *dev = &ap->device[i]; if (ata_dev_ready(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; ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); } } return 0; } 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, #ifdef CONFIG_PM .resume = ata_scsi_device_resume, .suspend = ata_scsi_device_suspend, #endif }; 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, .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_data_xfer, .freeze = ata_bmdma_freeze, .thaw = ata_bmdma_thaw, .error_handler = ata_bmdma_error_handler, .post_internal_cmd = ata_bmdma_post_internal_cmd, .cable_detect = ata_cable_40wire, .irq_handler = ata_interrupt, .irq_clear = ata_bmdma_irq_clear, .irq_on = ata_irq_on, .irq_ack = ata_irq_ack, .port_start = ata_port_start, }; 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; } #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);