029cfd6b74
libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
158 lines
4.0 KiB
C
158 lines
4.0 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 "0.2.4"
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/**
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* rz1000_set_mode - mode setting function
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* @link: ATA link
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* @unused: returned device on set_mode failure
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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 int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
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{
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struct ata_device *dev;
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ata_link_for_each_dev(dev, link) {
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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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ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
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}
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}
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return 0;
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}
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static struct scsi_host_template rz1000_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static struct ata_port_operations rz1000_port_ops = {
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.inherits = &ata_sff_port_ops,
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.cable_detect = ata_cable_40wire,
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.set_mode = rz1000_set_mode,
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};
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static int rz1000_fifo_disable(struct pci_dev *pdev)
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{
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u16 reg;
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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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return -1;
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reg &= 0xDFFF;
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if (pci_write_config_word(pdev, 0x40, reg) != 0)
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return -1;
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printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
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return 0;
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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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static const struct ata_port_info info = {
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.sht = &rz1000_sht,
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = 0x1f,
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.port_ops = &rz1000_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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if (!printed_version++)
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printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
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if (rz1000_fifo_disable(pdev) == 0)
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return ata_pci_init_one(pdev, ppi);
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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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#ifdef CONFIG_PM
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static int rz1000_reinit_one(struct pci_dev *pdev)
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{
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/* If this fails on resume (which is a "cant happen" case), we
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must stop as any progress risks data loss */
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if (rz1000_fifo_disable(pdev))
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panic("rz1000 fifo");
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return ata_pci_device_resume(pdev);
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}
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#endif
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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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#ifdef CONFIG_PM
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.suspend = ata_pci_device_suspend,
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.resume = rz1000_reinit_one,
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#endif
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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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