304 lines
8.0 KiB
C
304 lines
8.0 KiB
C
/*
|
|
* pata_efar.c - EFAR PIIX clone controller driver
|
|
*
|
|
* (C) 2005 Red Hat
|
|
* (C) 2009-2010 Bartlomiej Zolnierkiewicz
|
|
*
|
|
* Some parts based on ata_piix.c by Jeff Garzik and others.
|
|
*
|
|
* The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
|
|
* Intel ICH controllers the EFAR widened the UDMA mode register bits
|
|
* and doesn't require the funky clock selection.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <linux/libata.h>
|
|
#include <linux/ata.h>
|
|
|
|
#define DRV_NAME "pata_efar"
|
|
#define DRV_VERSION "0.4.5"
|
|
|
|
/**
|
|
* efar_pre_reset - Enable bits
|
|
* @link: ATA link
|
|
* @deadline: deadline jiffies for the operation
|
|
*
|
|
* Perform cable detection for the EFAR ATA interface. This is
|
|
* different to the PIIX arrangement
|
|
*/
|
|
|
|
static int efar_pre_reset(struct ata_link *link, unsigned long deadline)
|
|
{
|
|
static const struct pci_bits efar_enable_bits[] = {
|
|
{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
|
|
{ 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
|
|
};
|
|
struct ata_port *ap = link->ap;
|
|
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
|
|
|
|
if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
|
|
return -ENOENT;
|
|
|
|
return ata_sff_prereset(link, deadline);
|
|
}
|
|
|
|
/**
|
|
* efar_cable_detect - check for 40/80 pin
|
|
* @ap: Port
|
|
*
|
|
* Perform cable detection for the EFAR ATA interface. This is
|
|
* different to the PIIX arrangement
|
|
*/
|
|
|
|
static int efar_cable_detect(struct ata_port *ap)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
|
|
u8 tmp;
|
|
|
|
pci_read_config_byte(pdev, 0x47, &tmp);
|
|
if (tmp & (2 >> ap->port_no))
|
|
return ATA_CBL_PATA40;
|
|
return ATA_CBL_PATA80;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(efar_lock);
|
|
|
|
/**
|
|
* efar_set_piomode - Initialize host controller PATA PIO timings
|
|
* @ap: Port whose timings we are configuring
|
|
* @adev: Device to program
|
|
*
|
|
* Set PIO mode for device, in host controller PCI config space.
|
|
*
|
|
* LOCKING:
|
|
* None (inherited from caller).
|
|
*/
|
|
|
|
static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
|
|
{
|
|
unsigned int pio = adev->pio_mode - XFER_PIO_0;
|
|
struct pci_dev *dev = to_pci_dev(ap->host->dev);
|
|
unsigned int master_port = ap->port_no ? 0x42 : 0x40;
|
|
unsigned long flags;
|
|
u16 master_data;
|
|
u8 udma_enable;
|
|
int control = 0;
|
|
|
|
/*
|
|
* See Intel Document 298600-004 for the timing programing rules
|
|
* for PIIX/ICH. The EFAR is a clone so very similar
|
|
*/
|
|
|
|
static const /* ISP RTC */
|
|
u8 timings[][2] = { { 0, 0 },
|
|
{ 0, 0 },
|
|
{ 1, 0 },
|
|
{ 2, 1 },
|
|
{ 2, 3 }, };
|
|
|
|
if (pio > 1)
|
|
control |= 1; /* TIME */
|
|
if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
|
|
control |= 2; /* IE */
|
|
/* Intel specifies that the prefetch/posting is for disk only */
|
|
if (adev->class == ATA_DEV_ATA)
|
|
control |= 4; /* PPE */
|
|
|
|
spin_lock_irqsave(&efar_lock, flags);
|
|
|
|
pci_read_config_word(dev, master_port, &master_data);
|
|
|
|
/* Set PPE, IE, and TIME as appropriate */
|
|
if (adev->devno == 0) {
|
|
master_data &= 0xCCF0;
|
|
master_data |= control;
|
|
master_data |= (timings[pio][0] << 12) |
|
|
(timings[pio][1] << 8);
|
|
} else {
|
|
int shift = 4 * ap->port_no;
|
|
u8 slave_data;
|
|
|
|
master_data &= 0xFF0F;
|
|
master_data |= (control << 4);
|
|
|
|
/* Slave timing in separate register */
|
|
pci_read_config_byte(dev, 0x44, &slave_data);
|
|
slave_data &= ap->port_no ? 0x0F : 0xF0;
|
|
slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
|
|
pci_write_config_byte(dev, 0x44, slave_data);
|
|
}
|
|
|
|
master_data |= 0x4000; /* Ensure SITRE is set */
|
|
pci_write_config_word(dev, master_port, master_data);
|
|
|
|
pci_read_config_byte(dev, 0x48, &udma_enable);
|
|
udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
|
|
pci_write_config_byte(dev, 0x48, udma_enable);
|
|
spin_unlock_irqrestore(&efar_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* efar_set_dmamode - Initialize host controller PATA DMA timings
|
|
* @ap: Port whose timings we are configuring
|
|
* @adev: Device to program
|
|
*
|
|
* Set UDMA/MWDMA mode for device, in host controller PCI config space.
|
|
*
|
|
* LOCKING:
|
|
* None (inherited from caller).
|
|
*/
|
|
|
|
static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(ap->host->dev);
|
|
u8 master_port = ap->port_no ? 0x42 : 0x40;
|
|
u16 master_data;
|
|
u8 speed = adev->dma_mode;
|
|
int devid = adev->devno + 2 * ap->port_no;
|
|
unsigned long flags;
|
|
u8 udma_enable;
|
|
|
|
static const /* ISP RTC */
|
|
u8 timings[][2] = { { 0, 0 },
|
|
{ 0, 0 },
|
|
{ 1, 0 },
|
|
{ 2, 1 },
|
|
{ 2, 3 }, };
|
|
|
|
spin_lock_irqsave(&efar_lock, flags);
|
|
|
|
pci_read_config_word(dev, master_port, &master_data);
|
|
pci_read_config_byte(dev, 0x48, &udma_enable);
|
|
|
|
if (speed >= XFER_UDMA_0) {
|
|
unsigned int udma = adev->dma_mode - XFER_UDMA_0;
|
|
u16 udma_timing;
|
|
|
|
udma_enable |= (1 << devid);
|
|
|
|
/* Load the UDMA mode number */
|
|
pci_read_config_word(dev, 0x4A, &udma_timing);
|
|
udma_timing &= ~(7 << (4 * devid));
|
|
udma_timing |= udma << (4 * devid);
|
|
pci_write_config_word(dev, 0x4A, udma_timing);
|
|
} else {
|
|
/*
|
|
* MWDMA is driven by the PIO timings. We must also enable
|
|
* IORDY unconditionally along with TIME1. PPE has already
|
|
* been set when the PIO timing was set.
|
|
*/
|
|
unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
|
|
unsigned int control;
|
|
u8 slave_data;
|
|
const unsigned int needed_pio[3] = {
|
|
XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
|
|
};
|
|
int pio = needed_pio[mwdma] - XFER_PIO_0;
|
|
|
|
control = 3; /* IORDY|TIME1 */
|
|
|
|
/* If the drive MWDMA is faster than it can do PIO then
|
|
we must force PIO into PIO0 */
|
|
|
|
if (adev->pio_mode < needed_pio[mwdma])
|
|
/* Enable DMA timing only */
|
|
control |= 8; /* PIO cycles in PIO0 */
|
|
|
|
if (adev->devno) { /* Slave */
|
|
master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
|
|
master_data |= control << 4;
|
|
pci_read_config_byte(dev, 0x44, &slave_data);
|
|
slave_data &= ap->port_no ? 0x0F : 0xF0;
|
|
/* Load the matching timing */
|
|
slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
|
|
pci_write_config_byte(dev, 0x44, slave_data);
|
|
} else { /* Master */
|
|
master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
|
|
and master timing bits */
|
|
master_data |= control;
|
|
master_data |=
|
|
(timings[pio][0] << 12) |
|
|
(timings[pio][1] << 8);
|
|
}
|
|
udma_enable &= ~(1 << devid);
|
|
pci_write_config_word(dev, master_port, master_data);
|
|
}
|
|
pci_write_config_byte(dev, 0x48, udma_enable);
|
|
spin_unlock_irqrestore(&efar_lock, flags);
|
|
}
|
|
|
|
static struct scsi_host_template efar_sht = {
|
|
ATA_BMDMA_SHT(DRV_NAME),
|
|
};
|
|
|
|
static struct ata_port_operations efar_ops = {
|
|
.inherits = &ata_bmdma_port_ops,
|
|
.cable_detect = efar_cable_detect,
|
|
.set_piomode = efar_set_piomode,
|
|
.set_dmamode = efar_set_dmamode,
|
|
.prereset = efar_pre_reset,
|
|
};
|
|
|
|
|
|
/**
|
|
* efar_init_one - Register EFAR ATA PCI device with kernel services
|
|
* @pdev: PCI device to register
|
|
* @ent: Entry in efar_pci_tbl matching with @pdev
|
|
*
|
|
* Called from kernel PCI layer.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from PCI layer (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* Zero on success, or -ERRNO value.
|
|
*/
|
|
|
|
static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
|
|
{
|
|
static const struct ata_port_info info = {
|
|
.flags = ATA_FLAG_SLAVE_POSS,
|
|
.pio_mask = ATA_PIO4,
|
|
.mwdma_mask = ATA_MWDMA12_ONLY,
|
|
.udma_mask = ATA_UDMA4,
|
|
.port_ops = &efar_ops,
|
|
};
|
|
const struct ata_port_info *ppi[] = { &info, &info };
|
|
|
|
ata_print_version_once(&pdev->dev, DRV_VERSION);
|
|
|
|
return ata_pci_bmdma_init_one(pdev, ppi, &efar_sht, NULL,
|
|
ATA_HOST_PARALLEL_SCAN);
|
|
}
|
|
|
|
static const struct pci_device_id efar_pci_tbl[] = {
|
|
{ PCI_VDEVICE(EFAR, 0x9130), },
|
|
|
|
{ } /* terminate list */
|
|
};
|
|
|
|
static struct pci_driver efar_pci_driver = {
|
|
.name = DRV_NAME,
|
|
.id_table = efar_pci_tbl,
|
|
.probe = efar_init_one,
|
|
.remove = ata_pci_remove_one,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.suspend = ata_pci_device_suspend,
|
|
.resume = ata_pci_device_resume,
|
|
#endif
|
|
};
|
|
|
|
module_pci_driver(efar_pci_driver);
|
|
|
|
MODULE_AUTHOR("Alan Cox");
|
|
MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
|
|
MODULE_VERSION(DRV_VERSION);
|