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drivers/ata/pata_oldpiix.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * pata_oldpiix.c - Intel PATA/SATA controllers * |
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* (C) 2005 Red Hat |
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* * Some parts based on ata_piix.c by Jeff Garzik and others. * * Early PIIX differs significantly from the later PIIX as it lacks * SITRE and the slave timing registers. This means that you have to * set timing per channel, or be clever. Libata tells us whenever it * does drive selection and we use this to reload the timings. * * Because of these behaviour differences PIIX gets its own driver module. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> |
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#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_oldpiix" |
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#define DRV_VERSION "0.5.5" |
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/** * oldpiix_pre_reset - probe begin |
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* @link: ATA link |
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* @deadline: deadline jiffies for the operation |
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* * Set up cable type and use generic probe init */ |
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static int oldpiix_pre_reset(struct ata_link *link, unsigned long deadline) |
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{ |
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struct ata_port *ap = link->ap; |
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struct pci_dev *pdev = to_pci_dev(ap->host->dev); static const struct pci_bits oldpiix_enable_bits[] = { { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */ }; |
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if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no])) return -ENOENT; |
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return ata_sff_prereset(link, deadline); |
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} /** |
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* oldpiix_set_piomode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring |
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* @adev: Device whose timings we are configuring |
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* * Set PIO mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void oldpiix_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 idetm_port= ap->port_no ? 0x42 : 0x40; 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. */ static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, { 0, 0 }, { 1, 0 }, { 2, 1 }, { 2, 3 }, }; |
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if (pio > 1) control |= 1; /* TIME */ |
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if (ata_pio_need_iordy(adev)) |
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control |= 2; /* IE */ |
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/* Intel specifies that the prefetch/posting is for disk only */ |
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if (adev->class == ATA_DEV_ATA) |
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control |= 4; /* PPE */ |
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pci_read_config_word(dev, idetm_port, &idetm_data); |
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/* * Set PPE, IE and TIME as appropriate. * Clear the other drive's timing bits. */ |
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if (adev->devno == 0) { idetm_data &= 0xCCE0; idetm_data |= control; } else { idetm_data &= 0xCC0E; idetm_data |= (control << 4); } idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); pci_write_config_word(dev, idetm_port, idetm_data); /* Track which port is configured */ ap->private_data = adev; } /** * oldpiix_set_dmamode - Initialize host controller PATA DMA timings * @ap: Port whose timings we are configuring * @adev: Device to program |
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* * Set MWDMA mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev) { struct pci_dev *dev = to_pci_dev(ap->host->dev); u8 idetm_port = ap->port_no ? 0x42 : 0x40; u16 idetm_data; static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, { 0, 0 }, { 1, 0 }, { 2, 1 }, { 2, 3 }, }; /* * 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; const unsigned int needed_pio[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 }; int pio = needed_pio[mwdma] - XFER_PIO_0; pci_read_config_word(dev, idetm_port, &idetm_data); control = 3; /* IORDY|TIME0 */ /* Intel specifies that the PPE functionality is for disk only */ if (adev->class == ATA_DEV_ATA) control |= 4; /* PPE enable */ /* 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 */ /* Mask out the relevant control and timing bits we will load. Also clear the other drive TIME register as a precaution */ if (adev->devno == 0) { idetm_data &= 0xCCE0; idetm_data |= control; } else { idetm_data &= 0xCC0E; idetm_data |= (control << 4); } idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); pci_write_config_word(dev, idetm_port, idetm_data); /* Track which port is configured */ ap->private_data = adev; } /** |
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* oldpiix_qc_issue - command issue |
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* @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 |
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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 * be made PIO0. */ |
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static unsigned int oldpiix_qc_issue(struct ata_queued_cmd *qc) |
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{ struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; if (adev != ap->private_data) { |
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oldpiix_set_piomode(ap, adev); |
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if (ata_dma_enabled(adev)) |
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oldpiix_set_dmamode(ap, adev); |
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} |
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return ata_bmdma_qc_issue(qc); |
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} static struct scsi_host_template oldpiix_sht = { |
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ATA_BMDMA_SHT(DRV_NAME), |
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}; |
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static struct ata_port_operations oldpiix_pata_ops = { .inherits = &ata_bmdma_port_ops, |
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.qc_issue = oldpiix_qc_issue, |
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.cable_detect = ata_cable_40wire, |
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.set_piomode = oldpiix_set_piomode, .set_dmamode = oldpiix_set_dmamode, |
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.prereset = oldpiix_pre_reset, |
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}; /** * oldpiix_init_one - Register PIIX ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in oldpiix_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 oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) { |
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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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.port_ops = &oldpiix_pata_ops, }; |
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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, &oldpiix_sht, NULL, 0); |
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} static const struct pci_device_id oldpiix_pci_tbl[] = { |
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{ PCI_VDEVICE(INTEL, 0x1230), }, |
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{ } /* terminate list */ }; static struct pci_driver oldpiix_pci_driver = { .name = DRV_NAME, .id_table = oldpiix_pci_tbl, .probe = oldpiix_init_one, .remove = ata_pci_remove_one, |
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#ifdef CONFIG_PM_SLEEP |
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.suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, |
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#endif |
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}; |
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module_pci_driver(oldpiix_pci_driver); |
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MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl); MODULE_VERSION(DRV_VERSION); |