- 根目录:
- drivers
- ata
- pata_it8213.c
/*
* pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver
*
* The IT8213 is a very Intel ICH like device for timing purposes, having
* a similar register layout and the same split clock arrangement. Cable
* detection is different, and it does not have slave channels or all the
* clutter of later ICH/SATA setups.
*/
#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_it8213"
#define DRV_VERSION "0.0.3"
/**
* it8213_pre_reset - probe begin
* @link: link
* @deadline: deadline jiffies for the operation
*
* Filter out ports by the enable bits before doing the normal reset
* and probe.
*/
static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
{
static const struct pci_bits it8213_enable_bits[] = {
{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
};
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* it8213_cable_detect - check for 40/80 pin
* @ap: Port
*
* Perform cable detection for the 8213 ATA interface. This is
* different to the PIIX arrangement
*/
static int it8213_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 tmp;
pci_read_config_byte(pdev, 0x42, &tmp);
if (tmp & 2) /* The initial docs are incorrect */
return ATA_CBL_PATA40;
return ATA_CBL_PATA80;
}
/**
* it8213_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device whose timings we are configuring
*
* Set PIO mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void it8213_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;
u16 master_data;
int control = 0;
/*
* See Intel Document 298600-004 for the timing programing rules
* for PIIX/ICH. The 8213 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 */
/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
if (adev->class != ATA_DEV_ATA)
control |= 4; /* PPE */
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 {
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 &= 0xF0;
slave_data |= (timings[pio][0] << 2) | timings[pio][1];
pci_write_config_byte(dev, 0x44, slave_data);
}
master_data |= 0x4000; /* Ensure SITRE is set */
pci_write_config_word(dev, master_port, master_data);
}
/**
* it8213_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.
* This device is basically an ICH alike.
*
* LOCKING:
* None (inherited from caller).
*/
static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
u16 master_data;
u8 speed = adev->dma_mode;
int devid = adev->devno;
u8 udma_enable;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
pci_read_config_word(dev, 0x40, &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;
u16 ideconf;
int u_clock, u_speed;
/* Clocks follow the PIIX style */
u_speed = min(2 - (udma & 1), udma);
if (udma > 4)
u_clock = 0x1000; /* 100Mhz */
else if (udma > 2)
u_clock = 1; /* 66Mhz */
else
u_clock = 0; /* 33Mhz */
udma_enable |= (1 << devid);
/* Load the UDMA cycle time */
pci_read_config_word(dev, 0x4A, &udma_timing);
udma_timing &= ~(3 << (4 * devid));
udma_timing |= u_speed << (4 * devid);
pci_write_config_word(dev, 0x4A, udma_timing);
/* Load the clock selection */
pci_read_config_word(dev, 0x54, &ideconf);
ideconf &= ~(0x1001 << devid);
ideconf |= u_clock << devid;
pci_write_config_word(dev, 0x54, ideconf);
} 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;
static 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 (devid) { /* Slave */
master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
master_data |= control << 4;
pci_read_config_byte(dev, 0x44, &slave_data);
slave_data &= 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, 0x40, master_data);
}
pci_write_config_byte(dev, 0x48, udma_enable);
}
static struct scsi_host_template it8213_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations it8213_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = it8213_cable_detect,
.set_piomode = it8213_set_piomode,
.set_dmamode = it8213_set_dmamode,
.prereset = it8213_pre_reset,
};
/**
* it8213_init_one - Register 8213 ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in it8213_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 it8213_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_UDMA6,
.port_ops = &it8213_ops,
};
/* Current IT8213 stuff is single port */
const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
ata_print_version_once(&pdev->dev, DRV_VERSION);
return ata_pci_bmdma_init_one(pdev, ppi, &it8213_sht, NULL, 0);
}
static const struct pci_device_id it8213_pci_tbl[] = {
{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
{ } /* terminate list */
};
static struct pci_driver it8213_pci_driver = {
.name = DRV_NAME,
.id_table = it8213_pci_tbl,
.probe = it8213_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(it8213_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
MODULE_VERSION(DRV_VERSION);