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remarkable-linux/drivers/ata/pata_cs5535.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

284 lines
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/*
* pata-cs5535.c - CS5535 PATA for new ATA layer
* (C) 2005-2006 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
* made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de
* and Alexander Kiausch <alex.kiausch@t-online.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Loosely based on the piix & svwks drivers.
*
* Documentation:
* Available from AMD web site.
* TODO
* Review errata to see if serializing is neccessary
*/
#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>
#include <asm/msr.h>
#define DRV_NAME "cs5535"
#define DRV_VERSION "0.2.11"
/*
* The Geode (Aka Athlon GX now) uses an internal MSR based
* bus system for control. Demented but there you go.
*/
#define MSR_ATAC_BASE 0x51300000
#define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0)
#define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01)
#define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02)
#define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03)
#define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04)
#define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05)
#define ATAC_IO_BAR (MSR_ATAC_BASE+0x08)
#define ATAC_RESET (MSR_ATAC_BASE+0x10)
#define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20)
#define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21)
#define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22)
#define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23)
#define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24)
#define ATAC_BM0_CMD_PRIM 0x00
#define ATAC_BM0_STS_PRIM 0x02
#define ATAC_BM0_PRD 0x04
#define CS5535_CABLE_DETECT 0x48
#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL)==0x00009172 )
/**
* cs5535_cable_detect - detect cable type
* @ap: Port to detect on
* @deadline: deadline jiffies for the operation
*
* Perform cable detection for ATA66 capable cable. Return a libata
* cable type.
*/
static int cs5535_cable_detect(struct ata_port *ap)
{
u8 cable;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
if (cable & 1)
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* cs5535_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
*
* Set our PIO requirements. The CS5535 is pretty clean about all this
*/
static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
static const u16 pio_timings[5] = {
0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
};
static const u16 pio_cmd_timings[5] = {
0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
};
u32 reg, dummy;
struct ata_device *pair = ata_dev_pair(adev);
int mode = adev->pio_mode - XFER_PIO_0;
int cmdmode = mode;
/* Command timing has to be for the lowest of the pair of devices */
if (pair) {
int pairmode = pair->pio_mode - XFER_PIO_0;
cmdmode = min(mode, pairmode);
/* Write the other drive timing register if it changed */
if (cmdmode < pairmode)
wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
}
/* Write the drive timing register */
wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
/* Set the PIO "format 1" bit in the DMA timing register */
rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
}
/**
* cs5535_set_dmamode - DMA timing setup
* @ap: ATA interface
* @adev: Device being configured
*
*/
static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const u32 udma_timings[5] = {
0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
};
static const u32 mwdma_timings[3] = {
0x7F0FFFF3, 0x7F035352, 0x7F024241
};
u32 reg, dummy;
int mode = adev->dma_mode;
rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
reg &= 0x80000000UL;
if (mode >= XFER_UDMA_0)
reg |= udma_timings[mode - XFER_UDMA_0];
else
reg |= mwdma_timings[mode - XFER_MW_DMA_0];
wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
}
static struct scsi_host_template cs5535_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 cs5535_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = cs5535_set_piomode,
.set_dmamode = cs5535_set_dmamode,
.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 = cs5535_cable_detect,
.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_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = ata_port_start,
};
/**
* cs5535_init_one - Initialise a CS5530
* @dev: PCI device
* @id: Entry in match table
*
* Install a driver for the newly found CS5530 companion chip. Most of
* this is just housekeeping. We have to set the chip up correctly and
* turn off various bits of emulation magic.
*/
static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.sht = &cs5535_sht,
.flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x1f,
.port_ops = &cs5535_port_ops
};
const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
u32 timings, dummy;
/* Check the BIOS set the initial timing clock. If not set the
timings for PIO0 */
rdmsr(ATAC_CH0D0_PIO, timings, dummy);
if (CS5535_BAD_PIO(timings))
wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
rdmsr(ATAC_CH0D1_PIO, timings, dummy);
if (CS5535_BAD_PIO(timings))
wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
return ata_pci_init_one(dev, ppi);
}
static const struct pci_device_id cs5535[] = {
{ PCI_VDEVICE(NS, 0x002D), },
{ },
};
static struct pci_driver cs5535_pci_driver = {
.name = DRV_NAME,
.id_table = cs5535,
.probe = cs5535_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init cs5535_init(void)
{
return pci_register_driver(&cs5535_pci_driver);
}
static void __exit cs5535_exit(void)
{
pci_unregister_driver(&cs5535_pci_driver);
}
MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cs5535);
MODULE_VERSION(DRV_VERSION);
module_init(cs5535_init);
module_exit(cs5535_exit);
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