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-rw-r--r--drivers/ata/pata_oldpiix.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/ata/pata_oldpiix.c b/drivers/ata/pata_oldpiix.c
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+++ b/drivers/ata/pata_oldpiix.c
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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * pata_oldpiix.c - Intel PATA/SATA controllers
+ *
+ * (C) 2005 Red Hat
+ *
+ * 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>
+#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"
+#define DRV_VERSION "0.5.5"
+
+/**
+ * oldpiix_pre_reset - probe begin
+ * @link: ATA link
+ * @deadline: deadline jiffies for the operation
+ *
+ * Set up cable type and use generic probe init
+ */
+
+static int oldpiix_pre_reset(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 oldpiix_enable_bits[] = {
+ { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
+ { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
+ };
+
+ if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))
+ return -ENOENT;
+
+ return ata_sff_prereset(link, deadline);
+}
+
+/**
+ * oldpiix_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 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 }, };
+
+ if (pio > 1)
+ control |= 1; /* TIME */
+ if (ata_pio_need_iordy(adev))
+ control |= 2; /* IE */
+
+ /* Intel specifies that the prefetch/posting is for disk only */
+ if (adev->class == ATA_DEV_ATA)
+ control |= 4; /* PPE */
+
+ pci_read_config_word(dev, idetm_port, &idetm_data);
+
+ /*
+ * Set PPE, IE and TIME as appropriate.
+ * Clear the other drive's timing bits.
+ */
+ 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
+ *
+ * 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;
+}
+
+/**
+ * oldpiix_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 oldpiix_qc_issue(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ata_device *adev = qc->dev;
+
+ if (adev != ap->private_data) {
+ oldpiix_set_piomode(ap, adev);
+ if (ata_dma_enabled(adev))
+ oldpiix_set_dmamode(ap, adev);
+ }
+ return ata_bmdma_qc_issue(qc);
+}
+
+
+static struct scsi_host_template oldpiix_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations oldpiix_pata_ops = {
+ .inherits = &ata_bmdma_port_ops,
+ .qc_issue = oldpiix_qc_issue,
+ .cable_detect = ata_cable_40wire,
+ .set_piomode = oldpiix_set_piomode,
+ .set_dmamode = oldpiix_set_dmamode,
+ .prereset = oldpiix_pre_reset,
+};
+
+
+/**
+ * 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)
+{
+ static const struct ata_port_info info = {
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA12_ONLY,
+ .port_ops = &oldpiix_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, &oldpiix_sht, NULL, 0);
+}
+
+static const struct pci_device_id oldpiix_pci_tbl[] = {
+ { PCI_VDEVICE(INTEL, 0x1230), },
+
+ { } /* 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,
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+module_pci_driver(oldpiix_pci_driver);
+
+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);