188 lines
4.9 KiB
C
188 lines
4.9 KiB
C
/*
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* pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer
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* (C) 2006 Red Hat Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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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_ns87410"
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#define DRV_VERSION "0.4.6"
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/**
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* ns87410_pre_reset - probe begin
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* @link: ATA link
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* @deadline: deadline jiffies for the operation
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*
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* Check enabled ports
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*/
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static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
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{
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struct ata_port *ap = link->ap;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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static const struct pci_bits ns87410_enable_bits[] = {
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{ 0x43, 1, 0x08, 0x08 },
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{ 0x47, 1, 0x08, 0x08 }
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};
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if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
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return -ENOENT;
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return ata_sff_prereset(link, deadline);
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}
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/**
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* ns87410_set_piomode - set initial PIO mode data
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* @ap: ATA interface
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* @adev: ATA device
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*
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* Program timing data. This is kept per channel not per device,
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* and only affects the data port.
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*/
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static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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int port = 0x40 + 4 * ap->port_no;
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u8 idetcr, idefr;
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struct ata_timing at;
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static const u8 activebits[15] = {
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0, 1, 2, 3, 4,
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5, 5, 6, 6, 6,
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6, 7, 7, 7, 7
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};
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static const u8 recoverbits[12] = {
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0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
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};
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pci_read_config_byte(pdev, port + 3, &idefr);
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if (ata_pio_need_iordy(adev))
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idefr |= 0x04; /* IORDY enable */
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else
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idefr &= ~0x04;
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if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
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dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
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return;
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}
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at.active = clamp_val(at.active, 2, 16) - 2;
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at.setup = clamp_val(at.setup, 1, 4) - 1;
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at.recover = clamp_val(at.recover, 1, 12) - 1;
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idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
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pci_write_config_byte(pdev, port, idetcr);
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pci_write_config_byte(pdev, port + 3, idefr);
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/* We use ap->private_data as a pointer to the device currently
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loaded for timing */
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ap->private_data = adev;
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}
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/**
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* ns87410_qc_issue - command issue
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* @qc: command pending
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*
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* Called when the libata layer is about to issue a command. We wrap
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* this interface so that we can load the correct ATA timings if
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* necessary.
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*/
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static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_device *adev = qc->dev;
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/* If modes have been configured and the channel data is not loaded
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then load it. We have to check if pio_mode is set as the core code
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does not set adev->pio_mode to XFER_PIO_0 while probing as would be
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logical */
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if (adev->pio_mode && adev != ap->private_data)
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ns87410_set_piomode(ap, adev);
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return ata_sff_qc_issue(qc);
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}
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static struct scsi_host_template ns87410_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static struct ata_port_operations ns87410_port_ops = {
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.inherits = &ata_sff_port_ops,
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.qc_issue = ns87410_qc_issue,
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.cable_detect = ata_cable_40wire,
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.set_piomode = ns87410_set_piomode,
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.prereset = ns87410_pre_reset,
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};
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static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = 0x0F,
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.port_ops = &ns87410_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL);
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}
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static const struct pci_device_id ns87410[] = {
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{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
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{ },
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};
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static struct pci_driver ns87410_pci_driver = {
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.name = DRV_NAME,
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.id_table = ns87410,
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.probe = ns87410_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 = ata_pci_device_resume,
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#endif
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};
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static int __init ns87410_init(void)
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{
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return pci_register_driver(&ns87410_pci_driver);
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}
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static void __exit ns87410_exit(void)
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{
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pci_unregister_driver(&ns87410_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, ns87410);
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MODULE_VERSION(DRV_VERSION);
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module_init(ns87410_init);
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module_exit(ns87410_exit);
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