- 根目录:
- drivers
- ata
- pata_rdc.c
/*
* pata_rdc - Driver for later RDC PATA controllers
*
* This is actually a driver for hardware meeting
* INCITS 370-2004 (1510D): ATA Host Adapter Standards
*
* Based on ata_piix.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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 <linux/device.h>
#include <linux/gfp.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>
#define DRV_NAME "pata_rdc"
#define DRV_VERSION "0.01"
struct rdc_host_priv {
u32 saved_iocfg;
};
/**
* rdc_pata_cable_detect - Probe host controller cable detect info
* @ap: Port for which cable detect info is desired
*
* Read 80c cable indicator from ATA PCI device's PCI config
* register. This register is normally set by firmware (BIOS).
*
* LOCKING:
* None (inherited from caller).
*/
static int rdc_pata_cable_detect(struct ata_port *ap)
{
struct rdc_host_priv *hpriv = ap->host->private_data;
u8 mask;
/* check BIOS cable detect results */
mask = 0x30 << (2 * ap->port_no);
if ((hpriv->saved_iocfg & mask) == 0)
return ATA_CBL_PATA40;
return ATA_CBL_PATA80;
}
/**
* rdc_pata_prereset - prereset for PATA host controller
* @link: Target link
* @deadline: deadline jiffies for the operation
*
* LOCKING:
* None (inherited from caller).
*/
static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const struct pci_bits rdc_enable_bits[] = {
{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
{ 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
};
if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* rdc_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: um
*
* Set PIO mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void rdc_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 is_slave = (adev->devno != 0);
unsigned int master_port= ap->port_no ? 0x42 : 0x40;
unsigned int slave_port = 0x44;
u16 master_data;
u8 slave_data;
u8 udma_enable;
int control = 0;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
if (pio >= 2)
control |= 1; /* TIME1 enable */
if (ata_pio_need_iordy(adev))
control |= 2; /* IE enable */
if (adev->class == ATA_DEV_ATA)
control |= 4; /* PPE enable */
/* PIO configuration clears DTE unconditionally. It will be
* programmed in set_dmamode which is guaranteed to be called
* after set_piomode if any DMA mode is available.
*/
pci_read_config_word(dev, master_port, &master_data);
if (is_slave) {
/* clear TIME1|IE1|PPE1|DTE1 */
master_data &= 0xff0f;
/* Enable SITRE (separate slave timing register) */
master_data |= 0x4000;
/* enable PPE1, IE1 and TIME1 as needed */
master_data |= (control << 4);
pci_read_config_byte(dev, slave_port, &slave_data);
slave_data &= (ap->port_no ? 0x0f : 0xf0);
/* Load the timing nibble for this slave */
slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
<< (ap->port_no ? 4 : 0);
} else {
/* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
master_data &= 0xccf0;
/* Enable PPE, IE and TIME as appropriate */
master_data |= control;
/* load ISP and RCT */
master_data |=
(timings[pio][0] << 12) |
(timings[pio][1] << 8);
}
pci_write_config_word(dev, master_port, master_data);
if (is_slave)
pci_write_config_byte(dev, slave_port, slave_data);
/* Ensure the UDMA bit is off - it will be turned back on if
UDMA is selected */
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);
}
/**
* rdc_set_dmamode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Drive in question
*
* Set UDMA mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void rdc_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;
u8 udma_enable = 0;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
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;
u16 ideconf;
int u_clock, u_speed;
/*
* UDMA is handled by a combination of clock switching and
* selection of dividers
*
* Handy rule: Odd modes are UDMATIMx 01, even are 02
* except UDMA0 which is 00
*/
u_speed = min(2 - (udma & 1), udma);
if (udma == 5)
u_clock = 0x1000; /* 100Mhz */
else if (udma > 2)
u_clock = 1; /* 66Mhz */
else
u_clock = 0; /* 33Mhz */
udma_enable |= (1 << devid);
/* Load the CT/RP selection */
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);
/* Select a 33/66/100Mhz clock */
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;
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);
}
static struct ata_port_operations rdc_pata_ops = {
.inherits = &ata_bmdma32_port_ops,
.cable_detect = rdc_pata_cable_detect,
.set_piomode = rdc_set_piomode,
.set_dmamode = rdc_set_dmamode,
.prereset = rdc_pata_prereset,
};
static struct ata_port_info rdc_port_info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA12_ONLY,
.udma_mask = ATA_UDMA5,
.port_ops = &rdc_pata_ops,
};
static struct scsi_host_template rdc_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
/**
* rdc_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in rdc_pci_tbl matching with @pdev
*
* Called from kernel PCI layer. We probe for combined mode (sigh),
* and then hand over control to libata, for it to do the rest.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int __devinit rdc_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
static int printed_version;
struct device *dev = &pdev->dev;
struct ata_port_info port_info[2];
const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
unsigned long port_flags;
struct ata_host *host;
struct rdc_host_priv *hpriv;
int rc;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev,
"version " DRV_VERSION "\n");
port_info[0] = rdc_port_info;
port_info[1] = rdc_port_info;
port_flags = port_info[0].flags;
/* enable device and prepare host */
rc = pcim_enable_device(pdev);
if (rc)
return rc;
hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
if (!hpriv)
return -ENOMEM;
/* Save IOCFG, this will be used for cable detection, quirk
* detection and restoration on detach.
*/
pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
if (rc)
return rc;
host->private_data = hpriv;
pci_intx(pdev, 1);
host->flags |= ATA_HOST_PARALLEL_SCAN;
pci_set_master(pdev);
return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht);
}
static void rdc_remove_one(struct pci_dev *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
struct rdc_host_priv *hpriv = host->private_data;
pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
ata_pci_remove_one(pdev);
}
static const struct pci_device_id rdc_pci_tbl[] = {
{ PCI_DEVICE(0x17F3, 0x1011), },
{ PCI_DEVICE(0x17F3, 0x1012), },
{ } /* terminate list */
};
static struct pci_driver rdc_pci_driver = {
.name = DRV_NAME,
.id_table = rdc_pci_tbl,
.probe = rdc_init_one,
.remove = rdc_remove_one,
};
static int __init rdc_init(void)
{
return pci_register_driver(&rdc_pci_driver);
}
static void __exit rdc_exit(void)
{
pci_unregister_driver(&rdc_pci_driver);
}
module_init(rdc_init);
module_exit(rdc_exit);
MODULE_AUTHOR("Alan Cox (based on ata_piix)");
MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
MODULE_VERSION(DRV_VERSION);