linux/drivers/ata/pata_cmd640.c

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/*
* 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. 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 - 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(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_sff_qc_issue(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_sff_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 = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations cmd640_port_ops = {
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 03:22:49 +00:00
.inherits = &ata_bmdma_port_ops,
/* In theory xfer_noirq is not needed once we kill the prefetcher */
.sff_data_xfer = ata_sff_data_xfer_noirq,
.qc_issue = cmd640_qc_issue,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 03:22:49 +00:00
.cable_detect = ata_cable_40wire,
.set_piomode = cmd640_set_piomode,
.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)
{
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>
2007-05-04 10:43:58 +00:00
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.port_ops = &cmd640_port_ops
};
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>
2007-05-04 10:43:58 +00:00
const struct ata_port_info *ppi[] = { &info, NULL };
int rc;
rc = pcim_enable_device(pdev);
if (rc)
return rc;
cmd640_hardware_init(pdev);
return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL);
}
#ifdef CONFIG_PM
static int cmd640_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
cmd640_hardware_init(pdev);
ata_host_resume(host);
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,
.resume = cmd640_reinit_one,
#endif
};
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);