- 根目录:
- drivers
- ata
- pata_cs5530.c
/*
* pata-cs5530.c - CS5530 PATA for new ATA layer
* (C) 2005 Red Hat Inc
*
* based upon cs5530.c by Mark Lord.
*
* 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.
*/
#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 <linux/dmi.h>
#define DRV_NAME "pata_cs5530"
#define DRV_VERSION "0.7.4"
static void __iomem *cs5530_port_base(struct ata_port *ap)
{
unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;
return (void __iomem *)((bmdma & ~0x0F) + 0x20 + 0x10 * ap->port_no);
}
/**
* cs5530_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
*
* Set our PIO requirements. This is fairly simple on the CS5530
* chips.
*/
static void cs5530_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
static const unsigned int cs5530_pio_timings[2][5] = {
{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
};
void __iomem *base = cs5530_port_base(ap);
u32 tuning;
int format;
/* Find out which table to use */
tuning = ioread32(base + 0x04);
format = (tuning & 0x80000000UL) ? 1 : 0;
/* Now load the right timing register */
if (adev->devno)
base += 0x08;
iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);
}
/**
* cs5530_set_dmamode - DMA timing setup
* @ap: ATA interface
* @adev: Device being configured
*
* We cannot mix MWDMA and UDMA without reloading timings each switch
* master to slave. We track the last DMA setup in order to minimise
* reloads.
*/
static void cs5530_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
void __iomem *base = cs5530_port_base(ap);
u32 tuning, timing = 0;
u8 reg;
/* Find out which table to use */
tuning = ioread32(base + 0x04);
switch(adev->dma_mode) {
case XFER_UDMA_0:
timing = 0x00921250;break;
case XFER_UDMA_1:
timing = 0x00911140;break;
case XFER_UDMA_2:
timing = 0x00911030;break;
case XFER_MW_DMA_0:
timing = 0x00077771;break;
case XFER_MW_DMA_1:
timing = 0x00012121;break;
case XFER_MW_DMA_2:
timing = 0x00002020;break;
default:
BUG();
}
/* Merge in the PIO format bit */
timing |= (tuning & 0x80000000UL);
if (adev->devno == 0) /* Master */
iowrite32(timing, base + 0x04);
else {
if (timing & 0x00100000)
tuning |= 0x00100000; /* UDMA for both */
else
tuning &= ~0x00100000; /* MWDMA for both */
iowrite32(tuning, base + 0x04);
iowrite32(timing, base + 0x0C);
}
/* Set the DMA capable bit in the BMDMA area */
reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
reg |= (1 << (5 + adev->devno));
iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
/* Remember the last DMA setup we did */
ap->private_data = adev;
}
/**
* cs5530_qc_issue - 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
* necessary. Specifically we have a problem that there is only
* one MWDMA/UDMA bit.
*/
static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct ata_device *prev = ap->private_data;
/* See if the DMA settings could be wrong */
if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
/* Maybe, but do the channels match MWDMA/UDMA ? */
if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
(ata_using_udma(prev) && !ata_using_udma(adev)))
/* Switch the mode bits */
cs5530_set_dmamode(ap, adev);
}
return ata_bmdma_qc_issue(qc);
}
static struct scsi_host_template cs5530_sht = {
ATA_BMDMA_SHT(DRV_NAME),
.sg_tablesize = LIBATA_DUMB_MAX_PRD,
};
static struct ata_port_operations cs5530_port_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_prep = ata_bmdma_dumb_qc_prep,
.qc_issue = cs5530_qc_issue,
.cable_detect = ata_cable_40wire,
.set_piomode = cs5530_set_piomode,
.set_dmamode = cs5530_set_dmamode,
};
static const struct dmi_system_id palmax_dmi_table[] = {
{
.ident = "Palmax PD1100",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
},
},
{ }
};
static int cs5530_is_palmax(void)
{
if (dmi_check_system(palmax_dmi_table)) {
printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.\n");
return 1;
}
return 0;
}
/**
* cs5530_init_chip - Chipset init
*
* Perform the chip initialisation work that is shared between both
* setup and resume paths
*/
static int cs5530_init_chip(void)
{
struct pci_dev *master_0 = NULL, *cs5530_0 = NULL, *dev = NULL;
while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
switch (dev->device) {
case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
master_0 = pci_dev_get(dev);
break;
case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
cs5530_0 = pci_dev_get(dev);
break;
}
}
if (!master_0) {
printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
goto fail_put;
}
if (!cs5530_0) {
printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
goto fail_put;
}
pci_set_master(cs5530_0);
pci_try_set_mwi(cs5530_0);
/*
* Set PCI CacheLineSize to 16-bytes:
* --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
*
* Note: This value is constant because the 5530 is only a Geode companion
*/
pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
/*
* Disable trapping of UDMA register accesses (Win98 hack):
* --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
*/
pci_write_config_word(cs5530_0, 0xd0, 0x5006);
/*
* Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
* The other settings are what is necessary to get the register
* into a sane state for IDE DMA operation.
*/
pci_write_config_byte(master_0, 0x40, 0x1e);
/*
* Set max PCI burst size (16-bytes seems to work best):
* 16bytes: set bit-1 at 0x41 (reg value of 0x16)
* all others: clear bit-1 at 0x41, and do:
* 128bytes: OR 0x00 at 0x41
* 256bytes: OR 0x04 at 0x41
* 512bytes: OR 0x08 at 0x41
* 1024bytes: OR 0x0c at 0x41
*/
pci_write_config_byte(master_0, 0x41, 0x14);
/*
* These settings are necessary to get the chip
* into a sane state for IDE DMA operation.
*/
pci_write_config_byte(master_0, 0x42, 0x00);
pci_write_config_byte(master_0, 0x43, 0xc1);
pci_dev_put(master_0);
pci_dev_put(cs5530_0);
return 0;
fail_put:
if (master_0)
pci_dev_put(master_0);
if (cs5530_0)
pci_dev_put(cs5530_0);
return -ENODEV;
}
/**
* cs5530_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 cs5530_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
.port_ops = &cs5530_port_ops
};
/* The docking connector doesn't do UDMA, and it seems not MWDMA */
static const struct ata_port_info info_palmax_secondary = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.port_ops = &cs5530_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
int rc;
rc = pcim_enable_device(pdev);
if (rc)
return rc;
/* Chip initialisation */
if (cs5530_init_chip())
return -ENODEV;
if (cs5530_is_palmax())
ppi[1] = &info_palmax_secondary;
/* Now kick off ATA set up */
return ata_pci_bmdma_init_one(pdev, ppi, &cs5530_sht, NULL, 0);
}
#ifdef CONFIG_PM
static int cs5530_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = pci_get_drvdata(pdev);
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
/* If we fail on resume we are doomed */
if (cs5530_init_chip())
return -EIO;
ata_host_resume(host);
return 0;
}
#endif /* CONFIG_PM */
static const struct pci_device_id cs5530[] = {
{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },
{ },
};
static struct pci_driver cs5530_pci_driver = {
.name = DRV_NAME,
.id_table = cs5530,
.probe = cs5530_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = cs5530_reinit_one,
#endif
};
module_pci_driver(cs5530_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cs5530);
MODULE_VERSION(DRV_VERSION);