linux/drivers/ata/pata_cmd640.c
Tejun Heo 1626aeb881 libata: clean up SFF init mess
The intention of using port_mask in SFF init helpers was to eventually
support exoctic configurations such as combination of legacy and
native port on the same controller.  This never became actually
necessary and the related code always has been subtly broken one way
or the other.  Now that new init model is in place, there is no reason
to make common helpers capable of handling all corner cases.  Exotic
cases can simply dealt within LLDs as necessary.

This patch removes port_mask handling in SFF init helpers.  SFF init
helpers don't take n_ports argument and interpret it into port_mask
anymore.  All information is carried via port_info.  n_ports argument
is dropped and always two ports are allocated.  LLD can tell SFF to
skip certain port by marking it dummy.  Note that SFF code has been
treating unuvailable ports this way for a long time until recent
breakage fix from Linus and is consistent with how other drivers
handle with unavailable ports.

This fixes 1-port legacy host handling still broken after the recent
native mode fix and simplifies SFF init logic.  The following changes
are made...

* ata_pci_init_native_host() and ata_init_legacy_host() both now try
  to initialized whatever they can and mark failed ports dummy.  They
  return 0 if any port is successfully initialized.

* ata_pci_prepare_native_host() and ata_pci_init_one() now doesn't
  take n_ports argument.  All info should be specified via port_info
  array.  Always two ports are allocated.

* ata_pci_init_bmdma() exported to be used by LLDs in exotic cases.

* port_info handling in all LLDs are standardized - all port_info
  arrays are const stack variable named ppi.  Unless the second port
  is different from the first, its port_info is specified as NULL
  (tells libata that it's identical to the last non-NULL port_info).

* pata_hpt37x/hpt3x2n: don't modify static variable directly.  Make an
  on-stack copy instead as ata_piix does.

* pata_uli: It has 4 ports instead of 2.  Don't use
  ata_pci_prepare_native_host().  Allocate the host explicitly and use
  init helpers.  It's simple enough.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-05-11 18:09:18 -04:00

308 lines
7.4 KiB
C

/*
* pata_cmd640.c - CMD640 PCI PATA for new ATA layer
* (C) 2007 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* Based upon
* linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
*
* Copyright (C) 1995-1996 Linus Torvalds & authors (see driver)
*
* This drives only the PCI version of the controller. If you have a
* VLB one then we have enough docs to support it but you can write
* your own code.
*/
#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_cmd640"
#define DRV_VERSION "0.0.5"
struct cmd640_reg {
int last;
u8 reg58[ATA_MAX_DEVICES];
};
enum {
CFR = 0x50,
CNTRL = 0x51,
CMDTIM = 0x52,
ARTIM0 = 0x53,
DRWTIM0 = 0x54,
ARTIM23 = 0x57,
DRWTIM23 = 0x58,
BRST = 0x59
};
/**
* cmd640_set_piomode - set initial PIO mode data
* @ap: ATA port
* @adev: ATA device
*
* Called to do the PIO mode setup.
*/
static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct cmd640_reg *timing = ap->private_data;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct ata_timing t;
const unsigned long T = 1000000 / 33;
const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
u8 reg;
int arttim = ARTIM0 + 2 * adev->devno;
struct ata_device *pair = ata_dev_pair(adev);
if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
return;
}
/* The second channel has shared timings and the setup timing is
messy to switch to merge it for worst case */
if (ap->port_no && pair) {
struct ata_timing p;
ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
}
/* Make the timings fit */
if (t.recover > 16) {
t.active += t.recover - 16;
t.recover = 16;
}
if (t.active > 16)
t.active = 16;
/* Now convert the clocks into values we can actually stuff into
the chip */
if (t.recover > 1)
t.recover--; /* 640B only */
else
t.recover = 15;
if (t.setup > 4)
t.setup = 0xC0;
else
t.setup = setup_data[t.setup];
if (ap->port_no == 0) {
t.active &= 0x0F; /* 0 = 16 */
/* Load setup timing */
pci_read_config_byte(pdev, arttim, &reg);
reg &= 0x3F;
reg |= t.setup;
pci_write_config_byte(pdev, arttim, reg);
/* Load active/recovery */
pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
} else {
/* Save the shared timings for channel, they will be loaded
by qc_issue_prot. Reloading the setup time is expensive
so we keep a merged one loaded */
pci_read_config_byte(pdev, ARTIM23, &reg);
reg &= 0x3F;
reg |= t.setup;
pci_write_config_byte(pdev, ARTIM23, reg);
timing->reg58[adev->devno] = (t.active << 4) | t.recover;
}
}
/**
* cmd640_qc_issue_prot - command preparation hook
* @qc: Command to be issued
*
* Channel 1 has shared timings. We must reprogram the
* clock each drive 2/3 switch we do.
*/
static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct cmd640_reg *timing = ap->private_data;
if (ap->port_no != 0 && adev->devno != timing->last) {
pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
timing->last = adev->devno;
}
return ata_qc_issue_prot(qc);
}
/**
* cmd640_port_start - port setup
* @ap: ATA port being set up
*
* The CMD640 needs to maintain private data structures so we
* allocate space here.
*/
static int cmd640_port_start(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct cmd640_reg *timing;
int ret = ata_port_start(ap);
if (ret < 0)
return ret;
timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
if (timing == NULL)
return -ENOMEM;
timing->last = -1; /* Force a load */
ap->private_data = timing;
return ret;
}
static struct scsi_host_template cmd640_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,
};
static struct ata_port_operations cmd640_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = cmd640_set_piomode,
.mode_filter = ata_pci_default_filter,
.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 = ata_bmdma_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = ata_cable_40wire,
.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 = cmd640_qc_issue_prot,
/* In theory this is not needed once we kill the prefetcher */
.data_xfer = ata_data_xfer_noirq,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = cmd640_port_start,
};
static void cmd640_hardware_init(struct pci_dev *pdev)
{
u8 r;
u8 ctrl;
/* CMD640 detected, commiserations */
pci_write_config_byte(pdev, 0x5B, 0x00);
/* Get version info */
pci_read_config_byte(pdev, CFR, &r);
/* PIO0 command cycles */
pci_write_config_byte(pdev, CMDTIM, 0);
/* 512 byte bursts (sector) */
pci_write_config_byte(pdev, BRST, 0x40);
/*
* A reporter a long time ago
* Had problems with the data fifo
* So don't run the risk
* Of putting crap on the disk
* For its better just to go slow
*/
/* Do channel 0 */
pci_read_config_byte(pdev, CNTRL, &ctrl);
pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
/* Ditto for channel 1 */
pci_read_config_byte(pdev, ARTIM23, &ctrl);
ctrl |= 0x0C;
pci_write_config_byte(pdev, ARTIM23, ctrl);
}
static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.sht = &cmd640_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.port_ops = &cmd640_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
cmd640_hardware_init(pdev);
return ata_pci_init_one(pdev, ppi);
}
static int cmd640_reinit_one(struct pci_dev *pdev)
{
cmd640_hardware_init(pdev);
#ifdef CONFIG_PM
return ata_pci_device_resume(pdev);
#else
return 0;
#endif
}
static const struct pci_device_id cmd640[] = {
{ PCI_VDEVICE(CMD, 0x640), 0 },
{ },
};
static struct pci_driver cmd640_pci_driver = {
.name = DRV_NAME,
.id_table = cmd640,
.probe = cmd640_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
#endif
.resume = cmd640_reinit_one,
};
static int __init cmd640_init(void)
{
return pci_register_driver(&cmd640_pci_driver);
}
static void __exit cmd640_exit(void)
{
pci_unregister_driver(&cmd640_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cmd640);
MODULE_VERSION(DRV_VERSION);
module_init(cmd640_init);
module_exit(cmd640_exit);