/*
* pata_atiixp.c - ATI PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* Based on
*
* linux/drivers/ide/pci/atiixp.c Version 0.01-bart2 Feb. 26, 2004
*
* Copyright (C) 2003 ATI Inc. <hyu@ati.com>
* Copyright (C) 2004 Bartlomiej Zolnierkiewicz
*
*/
#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_atiixp"
#define DRV_VERSION "0.4.6"
enum {
ATIIXP_IDE_PIO_TIMING = 0x40,
ATIIXP_IDE_MWDMA_TIMING = 0x44,
ATIIXP_IDE_PIO_CONTROL = 0x48,
ATIIXP_IDE_PIO_MODE = 0x4a,
ATIIXP_IDE_UDMA_CONTROL = 0x54,
ATIIXP_IDE_UDMA_MODE = 0x56
};
static int atiixp_pre_reset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
static const struct pci_bits atiixp_enable_bits[] = {
{ 0x48, 1, 0x01, 0x00 },
{ 0x48, 1, 0x08, 0x00 }
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
static int atiixp_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 udma;
/* Hack from drivers/ide/pci. Really we want to know how to do the
raw detection not play follow the bios mode guess */
pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
return ATA_CBL_PATA80;
return ATA_CBL_PATA40;
}
/**
* atiixp_set_pio_timing - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called by both the pio and dma setup functions to set the controller
* timings for PIO transfers. We must load both the mode number and
* timing values into the controller.
*/
static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
{
static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = 2 * ap->port_no + adev->devno;
/* Check this is correct - the order is odd in both drivers */
int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
u16 pio_mode_data, pio_timing_data;
pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
pio_mode_data &= ~(0x7 << (4 * dn));
pio_mode_data |= pio << (4 * dn);
pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
pio_timing_data &= ~(0xFF << timing_shift);
pio_timing_data |= (pio_timings[pio] << timing_shift);
pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
}
/**
* atiixp_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. We use a shared helper for this
* as the DMA setup must also adjust the PIO timing information.
*/
static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
}
/**
* atiixp_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the DMA mode setup. We use timing tables for most
* modes but must tune an appropriate PIO mode to match.
*/
static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dma = adev->dma_mode;
int dn = 2 * ap->port_no + adev->devno;
int wanted_pio;
if (adev->dma_mode >= XFER_UDMA_0) {
u16 udma_mode_data;
dma -= XFER_UDMA_0;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
udma_mode_data &= ~(0x7 << (4 * dn));
udma_mode_data |= dma << (4 * dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
} else {
u16 mwdma_timing_data;
/* Check this is correct - the order is odd in both drivers */
int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
dma -= XFER_MW_DMA_0;
pci_read_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, &mwdma_timing_data);
mwdma_timing_data &= ~(0xFF << timing_shift);
mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
pci_write_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, mwdma_timing_data);
}
/*
* We must now look at the PIO mode situation. We may need to
* adjust the PIO mode to keep the timings acceptable
*/
if (adev->dma_mode >= XFER_MW_DMA_2)
wanted_pio = 4;
else if (adev->dma_mode == XFER_MW_DMA_1)
wanted_pio = 3;
else if (adev->dma_mode == XFER_MW_DMA_0)
wanted_pio = 0;
else BUG();
if (adev->pio_mode != wanted_pio)
atiixp_set_pio_timing(ap, adev, wanted_pio);
}
/**
* atiixp_bmdma_start - DMA start callback
* @qc: Command in progress
*
* When DMA begins we need to ensure that the UDMA control
* register for the channel is correctly set.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void atiixp_bmdma_start(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);
int dn = (2 * ap->port_no) + adev->devno;
u16 tmp16;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
if (adev->dma_mode >= XFER_UDMA_0)
tmp16 |= (1 << dn);
else
tmp16 &= ~(1 << dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
ata_bmdma_start(qc);
}
/**
* atiixp_dma_stop - DMA stop callback
* @qc: Command in progress
*
* DMA has completed. Clear the UDMA flag as the next operations will
* be PIO ones not UDMA data transfer.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = (2 * ap->port_no) + qc->dev->devno;
u16 tmp16;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
tmp16 &= ~(1 << dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
ata_bmdma_stop(qc);
}
static struct scsi_host_template atiixp_sht = {
ATA_BMDMA_SHT(DRV_NAME),
.sg_tablesize = LIBATA_DUMB_MAX_PRD,
};
static struct ata_port_operations atiixp_port_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_prep = ata_sff_dumb_qc_prep,
.bmdma_start = atiixp_bmdma_start,
.bmdma_stop = atiixp_bmdma_stop,
.cable_detect = atiixp_cable_detect,
.set_piomode = atiixp_set_piomode,
.set_dmamode = atiixp_set_dmamode,
.prereset = atiixp_pre_reset,
};
static int atiixp_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.mwdma_mask = 0x06, /* No MWDMA0 support */
.udma_mask = 0x3F,
.port_ops = &atiixp_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
return ata_pci_sff_init_one(dev, ppi, &atiixp_sht, NULL);
}
static const struct pci_device_id atiixp[] = {
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
{ },
};
static struct pci_driver atiixp_pci_driver = {
.name = DRV_NAME,
.id_table = atiixp,
.probe = atiixp_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.resume = ata_pci_device_resume,
.suspend = ata_pci_device_suspend,
#endif
};
static int __init atiixp_init(void)
{
return pci_register_driver(&atiixp_pci_driver);
}
static void __exit atiixp_exit(void)
{
pci_unregister_driver(&atiixp_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, atiixp);
MODULE_VERSION(DRV_VERSION);
module_init(atiixp_init);
module_exit(atiixp_exit);
