24dc5f33ea
Update libata LLDs to use devres. Core layer is already converted to
support managed LLDs. This patch simplifies initialization and fixes
many resource related bugs in init failure and detach path. For
example, all converted drivers now handle ata_device_add() failure
gracefully without excessive resource rollback code.
As most resources are released automatically on driver detach, many
drivers don't need or can do with much simpler ->{port|host}_stop().
In general, stop callbacks are need iff port or host needs to be given
commands to shut it down. Note that freezing is enough in many cases
and ports are automatically frozen before being detached.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
221 lines
5.5 KiB
C
221 lines
5.5 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 "0.2.3"
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/**
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* rz1000_prereset - probe begin
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* @ap: ATA port
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*
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* Set up cable type and use generics
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*/
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static int rz1000_prereset(struct ata_port *ap)
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{
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ap->cbl = ATA_CBL_PATA40;
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return ata_std_prereset(ap);
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}
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/**
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* rz1000_error_handler - probe reset
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* @ap: ATA port
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*
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* Perform the ATA standard reset sequence
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*/
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static void rz1000_error_handler(struct ata_port *ap)
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{
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ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
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}
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/**
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* rz1000_set_mode - mode setting function
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* @ap: ATA interface
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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_port *ap, struct ata_device **unused)
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{
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int i;
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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struct ata_device *dev = &ap->device[i];
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if (ata_dev_ready(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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}
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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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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.slave_destroy = ata_scsi_slave_destroy,
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.bios_param = ata_std_bios_param,
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.resume = ata_scsi_device_resume,
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.suspend = ata_scsi_device_suspend,
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};
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static struct ata_port_operations rz1000_port_ops = {
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.set_mode = rz1000_set_mode,
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.port_disable = ata_port_disable,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ata_pio_data_xfer,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = rz1000_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.port_start = ata_port_start,
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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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struct ata_port_info *port_info[2];
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static struct ata_port_info info = {
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.sht = &rz1000_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.port_ops = &rz1000_port_ops
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};
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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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port_info[0] = &info;
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port_info[1] = &info;
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return ata_pci_init_one(pdev, port_info, 2);
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}
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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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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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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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.suspend = ata_pci_device_suspend,
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.resume = rz1000_reinit_one,
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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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