254 lines
6.7 KiB
C
254 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* pata_radisys.c - Intel PATA/SATA controllers
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*
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* (C) 2006 Red Hat <alan@lxorguk.ukuu.org.uk>
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*
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* Some parts based on ata_piix.c by Jeff Garzik and others.
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*
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* A PIIX relative, this device has a single ATA channel and no
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* slave timings, SITRE or PPE. In that sense it is a close relative
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* of the original PIIX. It does however support UDMA 33/66 per channel
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* although no other modes/timings. Also lacking is 32bit I/O on the ATA
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* port.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <linux/ata.h>
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#define DRV_NAME "pata_radisys"
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#define DRV_VERSION "0.4.4"
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/**
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* radisys_set_piomode - Initialize host controller PATA PIO timings
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* @ap: ATA port
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* @adev: Device whose timings we are configuring
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*
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* Set PIO mode for device, in host controller PCI config space.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
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{
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unsigned int pio = adev->pio_mode - XFER_PIO_0;
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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u16 idetm_data;
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int control = 0;
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/*
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* See Intel Document 298600-004 for the timing programing rules
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* for PIIX/ICH. Note that the early PIIX does not have the slave
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* timing port at 0x44. The Radisys is a relative of the PIIX
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* but not the same so be careful.
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*/
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 }, /* Check me */
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{ 0, 0 },
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{ 1, 1 },
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{ 2, 2 },
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{ 3, 3 }, };
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if (pio > 0)
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control |= 1; /* TIME1 enable */
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if (ata_pio_need_iordy(adev))
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control |= 2; /* IE IORDY */
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pci_read_config_word(dev, 0x40, &idetm_data);
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/* Enable IE and TIME as appropriate. Clear the other
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drive timing bits */
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idetm_data &= 0xCCCC;
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idetm_data |= (control << (4 * adev->devno));
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idetm_data |= (timings[pio][0] << 12) |
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(timings[pio][1] << 8);
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pci_write_config_word(dev, 0x40, idetm_data);
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/* Track which port is configured */
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ap->private_data = adev;
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}
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/**
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* radisys_set_dmamode - Initialize host controller PATA DMA timings
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* @ap: Port whose timings we are configuring
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* @adev: Device to program
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*
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* Set MWDMA mode for device, in host controller PCI config space.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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{
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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u16 idetm_data;
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u8 udma_enable;
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 },
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{ 0, 0 },
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{ 1, 1 },
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{ 2, 2 },
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{ 3, 3 }, };
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/*
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* MWDMA is driven by the PIO timings. We must also enable
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* IORDY unconditionally.
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*/
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pci_read_config_word(dev, 0x40, &idetm_data);
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pci_read_config_byte(dev, 0x48, &udma_enable);
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if (adev->dma_mode < XFER_UDMA_0) {
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unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
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const unsigned int needed_pio[3] = {
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XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
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};
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int pio = needed_pio[mwdma] - XFER_PIO_0;
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int control = 3; /* IORDY|TIME0 */
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/* If the drive MWDMA is faster than it can do PIO then
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we must force PIO0 for PIO cycles. */
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if (adev->pio_mode < needed_pio[mwdma])
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control = 1;
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/* Mask out the relevant control and timing bits we will load. Also
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clear the other drive TIME register as a precaution */
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idetm_data &= 0xCCCC;
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idetm_data |= control << (4 * adev->devno);
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idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
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udma_enable &= ~(1 << adev->devno);
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} else {
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u8 udma_mode;
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/* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
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pci_read_config_byte(dev, 0x4A, &udma_mode);
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if (adev->xfer_mode == XFER_UDMA_2)
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udma_mode &= ~(2 << (adev->devno * 4));
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else /* UDMA 4 */
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udma_mode |= (2 << (adev->devno * 4));
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pci_write_config_byte(dev, 0x4A, udma_mode);
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udma_enable |= (1 << adev->devno);
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}
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pci_write_config_word(dev, 0x40, idetm_data);
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pci_write_config_byte(dev, 0x48, udma_enable);
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/* Track which port is configured */
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ap->private_data = adev;
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}
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/**
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* radisys_qc_issue - command issue
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* @qc: command pending
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*
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* Called when the libata layer is about to issue a command. We wrap
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* this interface so that we can load the correct ATA timings if
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* necessary. Our logic also clears TIME0/TIME1 for the other device so
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* that, even if we get this wrong, cycles to the other device will
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* be made PIO0.
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*/
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static unsigned int radisys_qc_issue(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_device *adev = qc->dev;
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if (adev != ap->private_data) {
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/* UDMA timing is not shared */
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if (adev->dma_mode < XFER_UDMA_0 || !ata_dma_enabled(adev)) {
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if (ata_dma_enabled(adev))
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radisys_set_dmamode(ap, adev);
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else if (adev->pio_mode)
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radisys_set_piomode(ap, adev);
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}
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}
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return ata_bmdma_qc_issue(qc);
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}
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static const struct scsi_host_template radisys_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations radisys_pata_ops = {
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.inherits = &ata_bmdma_port_ops,
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.qc_issue = radisys_qc_issue,
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.cable_detect = ata_cable_unknown,
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.set_piomode = radisys_set_piomode,
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.set_dmamode = radisys_set_dmamode,
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};
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/**
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* radisys_init_one - Register PIIX ATA PCI device with kernel services
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* @pdev: PCI device to register
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* @ent: Entry in radisys_pci_tbl matching with @pdev
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*
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* Called from kernel PCI layer. We probe for combined mode (sigh),
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* and then hand over control to libata, for it to do the rest.
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*
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* LOCKING:
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* Inherited from PCI layer (may sleep).
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*
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* RETURNS:
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* Zero on success, or -ERRNO value.
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*/
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static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA12_ONLY,
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.udma_mask = ATA_UDMA24_ONLY,
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.port_ops = &radisys_pata_ops,
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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ata_print_version_once(&pdev->dev, DRV_VERSION);
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return ata_pci_bmdma_init_one(pdev, ppi, &radisys_sht, NULL, 0);
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}
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static const struct pci_device_id radisys_pci_tbl[] = {
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{ PCI_VDEVICE(RADISYS, 0x8201), },
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{ } /* terminate list */
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};
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static struct pci_driver radisys_pci_driver = {
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.name = DRV_NAME,
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.id_table = radisys_pci_tbl,
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.probe = radisys_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM_SLEEP
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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module_pci_driver(radisys_pci_driver);
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
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MODULE_VERSION(DRV_VERSION);
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