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// SPDX-License-Identifier: GPL-2.0-only
/*
* pata_radisys.c - Intel PATA/SATA controllers
*
* (C) 2006 Red Hat <alan@lxorguk.ukuu.org.uk>
*
* Some parts based on ata_piix.c by Jeff Garzik and others.
*
* A PIIX relative, this device has a single ATA channel and no
* slave timings, SITRE or PPE. In that sense it is a close relative
* of the original PIIX. It does however support UDMA 33/66 per channel
* although no other modes/timings. Also lacking is 32bit I/O on the ATA
* port.
*/
#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_radisys"
#define DRV_VERSION "0.4.4"
/**
* radisys_set_piomode - Initialize host controller PATA PIO timings
* @ap: ATA port
* @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 radisys_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);
u16 idetm_data;
int control = 0;
/*
* See Intel Document 298600-004 for the timing programing rules
* for PIIX/ICH. Note that the early PIIX does not have the slave
* timing port at 0x44. The Radisys is a relative of the PIIX
* but not the same so be careful.
*/
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 }, /* Check me */
{ 0, 0 },
{ 1, 1 },
{ 2, 2 },
{ 3, 3 }, };
if (pio > 0)
control |= 1; /* TIME1 enable */
if (ata_pio_need_iordy(adev))
control |= 2; /* IE IORDY */
pci_read_config_word(dev, 0x40, &idetm_data);
/* Enable IE and TIME as appropriate. Clear the other
drive timing bits */
idetm_data &= 0xCCCC;
idetm_data |= (control << (4 * adev->devno));
idetm_data |= (timings[pio][0] << 12) |
(timings[pio][1] << 8);
pci_write_config_word(dev, 0x40, idetm_data);
/* Track which port is configured */
ap->private_data = adev;
}
/**
* radisys_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device to program
*
* Set MWDMA mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
u16 idetm_data;
u8 udma_enable;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 1 },
{ 2, 2 },
{ 3, 3 }, };
/*
* MWDMA is driven by the PIO timings. We must also enable
* IORDY unconditionally.
*/
pci_read_config_word(dev, 0x40, &idetm_data);
pci_read_config_byte(dev, 0x48, &udma_enable);
if (adev->dma_mode < XFER_UDMA_0) {
unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
const unsigned int needed_pio[3] = {
XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
};
int pio = needed_pio[mwdma] - XFER_PIO_0;
int control = 3; /* IORDY|TIME0 */
/* If the drive MWDMA is faster than it can do PIO then
we must force PIO0 for PIO cycles. */
if (adev->pio_mode < needed_pio[mwdma])
control = 1;
/* Mask out the relevant control and timing bits we will load. Also
clear the other drive TIME register as a precaution */
idetm_data &= 0xCCCC;
idetm_data |= control << (4 * adev->devno);
idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
udma_enable &= ~(1 << adev->devno);
} else {
u8 udma_mode;
/* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
pci_read_config_byte(dev, 0x4A, &udma_mode);
if (adev->xfer_mode == XFER_UDMA_2)
udma_mode &= ~(2 << (adev->devno * 4));
else /* UDMA 4 */
udma_mode |= (2 << (adev->devno * 4));
pci_write_config_byte(dev, 0x4A, udma_mode);
udma_enable |= (1 << adev->devno);
}
pci_write_config_word(dev, 0x40, idetm_data);
pci_write_config_byte(dev, 0x48, udma_enable);
/* Track which port is configured */
ap->private_data = adev;
}
/**
* radisys_qc_issue - command issue
* @qc: command pending
*
* Called when the libata layer is about to issue a command. We wrap
* this interface so that we can load the correct ATA timings if
* necessary. Our logic also clears TIME0/TIME1 for the other device so
* that, even if we get this wrong, cycles to the other device will
* be made PIO0.
*/
static unsigned int radisys_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
if (adev != ap->private_data) {
/* UDMA timing is not shared */
if (adev->dma_mode < XFER_UDMA_0 || !ata_dma_enabled(adev)) {
if (ata_dma_enabled(adev))
radisys_set_dmamode(ap, adev);
else if (adev->pio_mode)
radisys_set_piomode(ap, adev);
}
}
return ata_bmdma_qc_issue(qc);
}
static struct scsi_host_template radisys_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations radisys_pata_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_issue = radisys_qc_issue,
.cable_detect = ata_cable_unknown,
.set_piomode = radisys_set_piomode,
.set_dmamode = radisys_set_dmamode,
};
/**
* radisys_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in radisys_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 radisys_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_UDMA24_ONLY,
.port_ops = &radisys_pata_ops,
};
const struct ata_port_info *ppi[] = { &info, NULL };
ata_print_version_once(&pdev->dev, DRV_VERSION);
return ata_pci_bmdma_init_one(pdev, ppi, &radisys_sht, NULL, 0);
}
static const struct pci_device_id radisys_pci_tbl[] = {
{ PCI_VDEVICE(RADISYS, 0x8201), },
{ } /* terminate list */
};
static struct pci_driver radisys_pci_driver = {
.name = DRV_NAME,
.id_table = radisys_pci_tbl,
.probe = radisys_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(radisys_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
MODULE_VERSION(DRV_VERSION);
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