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/*
* pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer
* (C) 2006 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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_ns87410"
#define DRV_VERSION "0.4.2"
/**
* ns87410_pre_reset - probe begin
* @ap: ATA port
*
* Set up cable type and use generic probe init
*/
static int ns87410_pre_reset(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits ns87410_enable_bits[] = {
{ 0x43, 1, 0x08, 0x08 },
{ 0x47, 1, 0x08, 0x08 }
};
if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
return -ENOENT;
ap->cbl = ATA_CBL_PATA40;
return ata_std_prereset(ap);
}
/**
* ns87410_error_handler - probe reset
* @ap: ATA port
*
* Perform the ATA probe and bus reset sequence plus specific handling
* for this hardware. The MPIIX has the enable bits in a different place
* to PIIX4 and friends. As a pure PIO device it has no cable detect
*/
static void ns87410_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* ns87410_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program timing data. This is kept per channel not per device,
* and only affects the data port.
*/
static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = 0x40 + 4 * ap->port_no;
u8 idetcr, idefr;
struct ata_timing at;
static const u8 activebits[15] = {
0, 1, 2, 3, 4,
5, 5, 6, 6, 6,
6, 7, 7, 7, 7
};
static const u8 recoverbits[12] = {
0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
};
pci_read_config_byte(pdev, port + 3, &idefr);
if (ata_pio_need_iordy(adev))
idefr |= 0x04; /* IORDY enable */
else
idefr &= ~0x04;
if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
return;
}
at.active = FIT(at.active, 2, 16) - 2;
at.setup = FIT(at.setup, 1, 4) - 1;
at.recover = FIT(at.recover, 1, 12) - 1;
idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
pci_write_config_byte(pdev, port, idetcr);
pci_write_config_byte(pdev, port + 3, idefr);
/* We use ap->private_data as a pointer to the device currently
loaded for timing */
ap->private_data = adev;
}
/**
* ns87410_qc_issue_prot - command issue
* @qc: command pending
*
* Called when the libata layer is about to issue a command. We wrap
* this interface so that we can load the correct ATA timings if
* neccessary.
*/
static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
/* If modes have been configured and the channel data is not loaded
then load it. We have to check if pio_mode is set as the core code
does not set adev->pio_mode to XFER_PIO_0 while probing as would be
logical */
if (adev->pio_mode && adev != ap->private_data)
ns87410_set_piomode(ap, adev);
return ata_qc_issue_prot(qc);
}
static struct scsi_host_template ns87410_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,
.max_sectors = ATA_MAX_SECTORS,
.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,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations ns87410_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ns87410_set_piomode,
.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,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ns87410_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.qc_prep = ata_qc_prep,
.qc_issue = ns87410_qc_issue_prot,
.eng_timeout = ata_eng_timeout,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static struct ata_port_info info = {
.sht = &ns87410_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x0F,
.port_ops = &ns87410_port_ops
};
static struct ata_port_info *port_info[2] = {&info, &info};
return ata_pci_init_one(dev, port_info, 2);
}
static const struct pci_device_id ns87410[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410), },
{ 0, },
};
static struct pci_driver ns87410_pci_driver = {
.name = DRV_NAME,
.id_table = ns87410,
.probe = ns87410_init_one,
.remove = ata_pci_remove_one
};
static int __init ns87410_init(void)
{
return pci_register_driver(&ns87410_pci_driver);
}
static void __exit ns87410_exit(void)
{
pci_unregister_driver(&ns87410_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ns87410);
MODULE_VERSION(DRV_VERSION);
module_init(ns87410_init);
module_exit(ns87410_exit);
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