/*
* Copyright (C) 2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2000 Mark Lord <mlord@pobox.com>
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*
* May be copied or modified under the terms of the GNU General Public License
*
* Development of this chipset driver was funded
* by the nice folks at National Semiconductor.
*
* Documentation:
* CS5530 documentation available from National Semiconductor.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>
#define DRV_NAME "cs5530"
/*
* Here are the standard PIO mode 0-4 timings for each "format".
* Format-0 uses fast data reg timings, with slower command reg timings.
* Format-1 uses fast timings for all registers, but won't work with all drives.
*/
static unsigned int cs5530_pio_timings[2][5] = {
{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
};
/*
* After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
*/
#define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
#define CS5530_BASEREG(hwif) (((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))
/**
* cs5530_set_pio_mode - set host controller for PIO mode
* @drive: drive
* @pio: PIO mode number
*
* Handles setting of PIO mode for the chipset.
*
* The init_hwif_cs5530() routine guarantees that all drives
* will have valid default PIO timings set up before we get here.
*/
static void cs5530_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
unsigned long basereg = CS5530_BASEREG(drive->hwif);
unsigned int format = (inl(basereg + 4) >> 31) & 1;
outl(cs5530_pio_timings[format][pio], basereg + ((drive->dn & 1)<<3));
}
/**
* cs5530_udma_filter - UDMA filter
* @drive: drive
*
* cs5530_udma_filter() does UDMA mask filtering for the given drive
* taking into the consideration capabilities of the mate device.
*
* The CS5530 specifies that two drives sharing a cable cannot mix
* UDMA/MDMA. It has to be one or the other, for the pair, though
* different timings can still be chosen for each drive. We could
* set the appropriate timing bits on the fly, but that might be
* a bit confusing. So, for now we statically handle this requirement
* by looking at our mate drive to see what it is capable of, before
* choosing a mode for our own drive.
*
* Note: This relies on the fact we never fail from UDMA to MWDMA2
* but instead drop to PIO.
*/
static u8 cs5530_udma_filter(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
ide_drive_t *mate = ide_get_pair_dev(drive);
u16 *mateid;
u8 mask = hwif->ultra_mask;
if (mate == NULL)
goto out;
mateid = mate->id;
if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
(mateid[ATA_ID_UDMA_MODES] & 7))
goto out;
if ((mateid[ATA_ID_FIELD_VALID] & 2) &&
(mateid[ATA_ID_MWDMA_MODES] & 7))
mask = 0;
}
out:
return mask;
}
static void cs5530_set_dma_mode(ide_drive_t *drive, const u8 mode)
{
unsigned long basereg;
unsigned int reg, timings = 0;
switch (mode) {
case XFER_UDMA_0: timings = 0x00921250; break;
case XFER_UDMA_1: timings = 0x00911140; break;
case XFER_UDMA_2: timings = 0x00911030; break;
case XFER_MW_DMA_0: timings = 0x00077771; break;
case XFER_MW_DMA_1: timings = 0x00012121; break;
case XFER_MW_DMA_2: timings = 0x00002020; break;
}
basereg = CS5530_BASEREG(drive->hwif);
reg = inl(basereg + 4); /* get drive0 config register */
timings |= reg & 0x80000000; /* preserve PIO format bit */
if ((drive-> dn & 1) == 0) { /* are we configuring drive0? */
outl(timings, basereg + 4); /* write drive0 config register */
} else {
if (timings & 0x00100000)
reg |= 0x00100000; /* enable UDMA timings for both drives */
else
reg &= ~0x00100000; /* disable UDMA timings for both drives */
outl(reg, basereg + 4); /* write drive0 config register */
outl(timings, basereg + 12); /* write drive1 config register */
}
}
/**
* init_chipset_5530 - set up 5530 bridge
* @dev: PCI device
*
* Initialize the cs5530 bridge for reliable IDE DMA operation.
*/
static unsigned int init_chipset_cs5530(struct pci_dev *dev)
{
struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
if (pci_resource_start(dev, 4) == 0)
return -EFAULT;
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 out;
}
if (!cs5530_0) {
printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
goto out;
}
/*
* Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
* --> OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
*/
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
*/
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);
out:
pci_dev_put(master_0);
pci_dev_put(cs5530_0);
return 0;
}
/**
* init_hwif_cs5530 - initialise an IDE channel
* @hwif: IDE to initialize
*
* This gets invoked by the IDE driver once for each channel. It
* performs channel-specific pre-initialization before drive probing.
*/
static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
{
unsigned long basereg;
u32 d0_timings;
basereg = CS5530_BASEREG(hwif);
d0_timings = inl(basereg + 0);
if (CS5530_BAD_PIO(d0_timings))
outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 0);
if (CS5530_BAD_PIO(inl(basereg + 8)))
outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 8);
}
static const struct ide_port_ops cs5530_port_ops = {
.set_pio_mode = cs5530_set_pio_mode,
.set_dma_mode = cs5530_set_dma_mode,
.udma_filter = cs5530_udma_filter,
};
static const struct ide_port_info cs5530_chipset __devinitdata = {
.name = DRV_NAME,
.init_chipset = init_chipset_cs5530,
.init_hwif = init_hwif_cs5530,
.port_ops = &cs5530_port_ops,
.host_flags = IDE_HFLAG_SERIALIZE |
IDE_HFLAG_POST_SET_MODE,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
};
static int __devinit cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
return ide_pci_init_one(dev, &cs5530_chipset, NULL);
}
static const struct pci_device_id cs5530_pci_tbl[] = {
{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), 0 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl);
static struct pci_driver cs5530_pci_driver = {
.name = "CS5530 IDE",
.id_table = cs5530_pci_tbl,
.probe = cs5530_init_one,
.remove = ide_pci_remove,
.suspend = ide_pci_suspend,
.resume = ide_pci_resume,
};
static int __init cs5530_ide_init(void)
{
return ide_pci_register_driver(&cs5530_pci_driver);
}
static void __exit cs5530_ide_exit(void)
{
pci_unregister_driver(&cs5530_pci_driver);
}
module_init(cs5530_ide_init);
module_exit(cs5530_ide_exit);
MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE");
MODULE_LICENSE("GPL");
