/*
* pata_pdc202xx_old.c - Promise PDC202xx PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@lxorguk.ukuu.org.uk>
* (C) 2007 Bartlomiej Zolnierkiewicz
*
* Based in part on linux/drivers/ide/pci/pdc202xx_old.c
*
* First cut with LBA48/ATAPI
*
* TODO:
* Channel interlock/reset on both required ?
*/
#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_pdc202xx_old"
#define DRV_VERSION "0.4.3"
static int pdc2026x_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u16 cis;
pci_read_config_word(pdev, 0x50, &cis);
if (cis & (1 << (10 + ap->port_no)))
return ATA_CBL_PATA40;
return ATA_CBL_PATA80;
}
/**
* pdc202xx_configure_piomode - set chip PIO timing
* @ap: ATA interface
* @adev: ATA device
* @pio: PIO mode
*
* Called to do the PIO mode setup. Our timing registers are shared
* so a configure_dmamode call will undo any work we do here and vice
* versa
*/
static void pdc202xx_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = 0x60 + 8 * ap->port_no + 4 * adev->devno;
static u16 pio_timing[5] = {
0x0913, 0x050C , 0x0308, 0x0206, 0x0104
};
u8 r_ap, r_bp;
pci_read_config_byte(pdev, port, &r_ap);
pci_read_config_byte(pdev, port + 1, &r_bp);
r_ap &= ~0x3F; /* Preserve ERRDY_EN, SYNC_IN */
r_bp &= ~0x1F;
r_ap |= (pio_timing[pio] >> 8);
r_bp |= (pio_timing[pio] & 0xFF);
if (ata_pio_need_iordy(adev))
r_ap |= 0x20; /* IORDY enable */
if (adev->class == ATA_DEV_ATA)
r_ap |= 0x10; /* FIFO enable */
pci_write_config_byte(pdev, port, r_ap);
pci_write_config_byte(pdev, port + 1, r_bp);
}
/**
* pdc202xx_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. Our timing registers are shared
* but we want to set the PIO timing by default.
*/
static void pdc202xx_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
pdc202xx_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
}
/**
* pdc202xx_configure_dmamode - set DMA mode in chip
* @ap: ATA interface
* @adev: ATA device
*
* Load DMA cycle times into the chip ready for a DMA transfer
* to occur.
*/
static void pdc202xx_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = 0x60 + 8 * ap->port_no + 4 * adev->devno;
static u8 udma_timing[6][2] = {
{ 0x60, 0x03 }, /* 33 Mhz Clock */
{ 0x40, 0x02 },
{ 0x20, 0x01 },
{ 0x40, 0x02 }, /* 66 Mhz Clock */
{ 0x20, 0x01 },
{ 0x20, 0x01 }
};
static u8 mdma_timing[3][2] = {
{ 0xe0, 0x0f },
{ 0x60, 0x04 },
{ 0x60, 0x03 },
};
u8 r_bp, r_cp;
pci_read_config_byte(pdev, port + 1, &r_bp);
pci_read_config_byte(pdev, port + 2, &r_cp);
r_bp &= ~0xE0;
r_cp &= ~0x0F;
if (adev->dma_mode >= XFER_UDMA_0) {
int speed = adev->dma_mode - XFER_UDMA_0;
r_bp |= udma_timing[speed][0];
r_cp |= udma_timing[speed][1];
} else {
int speed = adev->dma_mode - XFER_MW_DMA_0;
r_bp |= mdma_timing[speed][0];
r_cp |= mdma_timing[speed][1];
}
pci_write_config_byte(pdev, port + 1, r_bp);
pci_write_config_byte(pdev, port + 2, r_cp);
}
/**
* pdc2026x_bmdma_start - DMA engine begin
* @qc: ATA command
*
* In UDMA3 or higher we have to clock switch for the duration of the
* DMA transfer sequence.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void pdc2026x_bmdma_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct ata_taskfile *tf = &qc->tf;
int sel66 = ap->port_no ? 0x08: 0x02;
void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr;
void __iomem *clock = master + 0x11;
void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no);
u32 len;
/* Check we keep host level locking here */
if (adev->dma_mode >= XFER_UDMA_2)
iowrite8(ioread8(clock) | sel66, clock);
else
iowrite8(ioread8(clock) & ~sel66, clock);
/* The DMA clocks may have been trashed by a reset. FIXME: make conditional
and move to qc_issue ? */
pdc202xx_set_dmamode(ap, qc->dev);
/* Cases the state machine will not complete correctly without help */
if ((tf->flags & ATA_TFLAG_LBA48) || tf->protocol == ATAPI_PROT_DMA) {
len = qc->nbytes / 2;
if (tf->flags & ATA_TFLAG_WRITE)
len |= 0x06000000;
else
len |= 0x05000000;
iowrite32(len, atapi_reg);
}
/* Activate DMA */
ata_bmdma_start(qc);
}
/**
* pdc2026x_bmdma_end - DMA engine stop
* @qc: ATA command
*
* After a DMA completes we need to put the clock back to 33MHz for
* PIO timings.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void pdc2026x_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct ata_taskfile *tf = &qc->tf;
int sel66 = ap->port_no ? 0x08: 0x02;
/* The clock bits are in the same register for both channels */
void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr;
void __iomem *clock = master + 0x11;
void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no);
/* Cases the state machine will not complete correctly */
if (tf->protocol == ATAPI_PROT_DMA || (tf->flags & ATA_TFLAG_LBA48)) {
iowrite32(0, atapi_reg);
iowrite8(ioread8(clock) & ~sel66, clock);
}
/* Flip back to 33Mhz for PIO */
if (adev->dma_mode >= XFER_UDMA_2)
iowrite8(ioread8(clock) & ~sel66, clock);
ata_bmdma_stop(qc);
pdc202xx_set_piomode(ap, adev);
}
/**
* pdc2026x_dev_config - device setup hook
* @adev: newly found device
*
* Perform chip specific early setup. We need to lock the transfer
* sizes to 8bit to avoid making the state engine on the 2026x cards
* barf.
*/
static void pdc2026x_dev_config(struct ata_device *adev)
{
adev->max_sectors = 256;
}
static int pdc2026x_port_start(struct ata_port *ap)
{
void __iomem *bmdma = ap->ioaddr.bmdma_addr;
if (bmdma) {
/* Enable burst mode */
u8 burst = ioread8(bmdma + 0x1f);
iowrite8(burst | 0x01, bmdma + 0x1f);
}
return ata_sff_port_start(ap);
}
/**
* pdc2026x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
* @qc: Metadata associated with taskfile to check
*
* Just say no - not supported on older Promise.
*
* LOCKING:
* None (inherited from caller).
*
* RETURNS: 0 when ATAPI DMA can be used
* 1 otherwise
*/
static int pdc2026x_check_atapi_dma(struct ata_queued_cmd *qc)
{
return 1;
}
static struct scsi_host_template pdc202xx_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations pdc2024x_port_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = pdc202xx_set_piomode,
.set_dmamode = pdc202xx_set_dmamode,
};
static struct ata_port_operations pdc2026x_port_ops = {
.inherits = &pdc2024x_port_ops,
.check_atapi_dma = pdc2026x_check_atapi_dma,
.bmdma_start = pdc2026x_bmdma_start,
.bmdma_stop = pdc2026x_bmdma_stop,
.cable_detect = pdc2026x_cable_detect,
.dev_config = pdc2026x_dev_config,
.port_start = pdc2026x_port_start,
};
static int pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info[3] = {
{
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
.port_ops = &pdc2024x_port_ops
},
{
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &pdc2026x_port_ops
},
{
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &pdc2026x_port_ops
}
};
const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
if (dev->device == PCI_DEVICE_ID_PROMISE_20265) {
struct pci_dev *bridge = dev->bus->self;
/* Don't grab anything behind a Promise I2O RAID */
if (bridge && bridge->vendor == PCI_VENDOR_ID_INTEL) {
if (bridge->device == PCI_DEVICE_ID_INTEL_I960)
return -ENODEV;
if (bridge->device == PCI_DEVICE_ID_INTEL_I960RM)
return -ENODEV;
}
}
return ata_pci_sff_init_one(dev, ppi, &pdc202xx_sht, NULL);
}
static const struct pci_device_id pdc202xx[] = {
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20246), 0 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20262), 1 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20263), 1 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20265), 2 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20267), 2 },
{ },
};
static struct pci_driver pdc202xx_pci_driver = {
.name = DRV_NAME,
.id_table = pdc202xx,
.probe = pdc202xx_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init pdc202xx_init(void)
{
return pci_register_driver(&pdc202xx_pci_driver);
}
static void __exit pdc202xx_exit(void)
{
pci_unregister_driver(&pdc202xx_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Promise 2024x and 20262-20267");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pdc202xx);
MODULE_VERSION(DRV_VERSION);
module_init(pdc202xx_init);
module_exit(pdc202xx_exit);
