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linux-hardened/drivers/ata/pata_opti.c
Tejun Heo 24dc5f33ea libata: update libata LLDs to use devres 
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>
2007-02-09 17:39:37 -05:00

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/*
* pata_opti.c - ATI PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* Based on
* linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
*
* Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
*
* Authors:
* Jaromir Koutek <miri@punknet.cz>,
* Jan Harkes <jaharkes@cwi.nl>,
* Mark Lord <mlord@pobox.com>
* Some parts of code are from ali14xx.c and from rz1000.c.
*
* Also consulted the FreeBSD prototype driver by Kevin Day to try
* and resolve some confusions. Further documentation can be found in
* Ralf Brown's interrupt list
*
* If you have other variants of the Opti range (Viper/Vendetta) please
* try this driver with those PCI idents and report back. For the later
* chips see the pata_optidma driver
*
*/
#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_opti"
#define DRV_VERSION "0.2.7"
enum {
READ_REG = 0, /* index of Read cycle timing register */
WRITE_REG = 1, /* index of Write cycle timing register */
CNTRL_REG = 3, /* index of Control register */
STRAP_REG = 5, /* index of Strap register */
MISC_REG = 6 /* index of Miscellaneous register */
};
/**
* opti_pre_reset - probe begin
* @ap: ATA port
*
* Set up cable type and use generic probe init
*/
static int opti_pre_reset(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits opti_enable_bits[] = {
{ 0x45, 1, 0x80, 0x00 },
{ 0x40, 1, 0x08, 0x00 }
};
if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
return -ENOENT;
ap->cbl = ATA_CBL_PATA40;
return ata_std_prereset(ap);
}
/**
* opti_probe_reset - probe reset
* @ap: ATA port
*
* Perform the ATA probe and bus reset sequence plus specific handling
* for this hardware. The Opti needs little handling - we have no UDMA66
* capability that needs cable detection. All we must do is check the port
* is enabled.
*/
static void opti_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* opti_write_reg - control register setup
* @ap: ATA port
* @value: value
* @reg: control register number
*
* The Opti uses magic 'trapdoor' register accesses to do configuration
* rather than using PCI space as other controllers do. The double inw
* on the error register activates configuration mode. We can then write
* the control register
*/
static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
{
unsigned long regio = ap->ioaddr.cmd_addr;
/* These 3 unlock the control register access */
inw(regio + 1);
inw(regio + 1);
outb(3, regio + 2);
/* Do the I/O */
outb(val, regio + reg);
/* Relock */
outb(0x83, regio + 2);
}
/**
* opti_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. Timing numbers are taken from
* the FreeBSD driver then pre computed to keep the code clean. There
* are two tables depending on the hardware clock speed.
*/
static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_device *pair = ata_dev_pair(adev);
int clock;
int pio = adev->pio_mode - XFER_PIO_0;
unsigned long regio = ap->ioaddr.cmd_addr;
u8 addr;
/* Address table precomputed with prefetch off and a DCLK of 2 */
static const u8 addr_timing[2][5] = {
{ 0x30, 0x20, 0x20, 0x10, 0x10 },
{ 0x20, 0x20, 0x10, 0x10, 0x10 }
};
static const u8 data_rec_timing[2][5] = {
{ 0x6B, 0x56, 0x42, 0x32, 0x31 },
{ 0x58, 0x44, 0x32, 0x22, 0x21 }
};
outb(0xff, regio + 5);
clock = inw(regio + 5) & 1;
/*
* As with many controllers the address setup time is shared
* and must suit both devices if present.
*/
addr = addr_timing[clock][pio];
if (pair) {
/* Hardware constraint */
u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
if (pair_addr > addr)
addr = pair_addr;
}
/* Commence primary programming sequence */
opti_write_reg(ap, adev->devno, MISC_REG);
opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
opti_write_reg(ap, addr, MISC_REG);
/* Programming sequence complete, override strapping */
opti_write_reg(ap, 0x85, CNTRL_REG);
}
static struct scsi_host_template opti_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,
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
};
static struct ata_port_operations opti_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = opti_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 = opti_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.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_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
};
static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static struct ata_port_info info = {
.sht = &opti_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.port_ops = &opti_port_ops
};
static struct ata_port_info *port_info[2] = { &info, &info };
static int printed_version;
if (!printed_version++)
dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
return ata_pci_init_one(dev, port_info, 2);
}
static const struct pci_device_id opti[] = {
{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
{ },
};
static struct pci_driver opti_pci_driver = {
.name = DRV_NAME,
.id_table = opti,
.probe = opti_init_one,
.remove = ata_pci_remove_one,
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
};
static int __init opti_init(void)
{
return pci_register_driver(&opti_pci_driver);
}
static void __exit opti_exit(void)
{
pci_unregister_driver(&opti_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, opti);
MODULE_VERSION(DRV_VERSION);
module_init(opti_init);
module_exit(opti_exit);
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