--- /dev/null
+/*
+ * pata_mpiix.c - Intel MPIIX PATA for new ATA layer
+ * (C) 2005-2006 Red Hat Inc
+ * Alan Cox <alan@redhat.com>
+ *
+ * The MPIIX is different enough to the PIIX4 and friends that we give it
+ * a separate driver. The old ide/pci code handles this by just not tuning
+ * MPIIX at all.
+ *
+ * The MPIIX also differs in another important way from the majority of PIIX
+ * devices. The chip is a bridge (pardon the pun) between the old world of
+ * ISA IDE and PCI IDE. Although the ATA timings are PCI configured the actual
+ * IDE controller is not decoded in PCI space and the chip does not claim to
+ * be IDE class PCI. This requires slightly non-standard probe logic compared
+ * with PCI IDE and also that we do not disable the device when our driver is
+ * unloaded (as it has many other functions).
+ *
+ * The driver conciously keeps this logic internally to avoid pushing quirky
+ * PATA history into the clean libata layer.
+ *
+ * Thinkpad specific note: If you boot an MPIIX using a thinkpad with a PCMCIA
+ * hard disk present this driver will not detect it. This is not a bug. In this
+ * configuration the secondary port of the MPIIX is disabled and the addresses
+ * are decoded by the PCMCIA bridge and therefore are for a generic IDE driver
+ * to operate.
+ */
+
+#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 <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_mpiix"
+#define DRV_VERSION "0.7.3"
+
+enum {
+ IDETIM = 0x6C, /* IDE control register */
+ IORDY = (1 << 1),
+ PPE = (1 << 2),
+ FTIM = (1 << 0),
+ ENABLED = (1 << 15),
+ SECONDARY = (1 << 14)
+};
+
+static int mpiix_pre_reset(struct ata_port *ap)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ static const struct pci_bits mpiix_enable_bits[] = {
+ { 0x6D, 1, 0x80, 0x80 },
+ { 0x6F, 1, 0x80, 0x80 }
+ };
+
+ if (!pci_test_config_bits(pdev, &mpiix_enable_bits[ap->port_no]))
+ return -ENOENT;
+ ap->cbl = ATA_CBL_PATA40;
+ return ata_std_prereset(ap);
+}
+
+/**
+ * mpiix_error_handler - probe reset
+ * @ap: ATA port
+ *
+ * Perform the ATA probe and bus reset sequence plus specific handling
+ * for this hardware. The MPIIX has the enable bits in a different place
+ * to PIIX4 and friends. As a pure PIO device it has no cable detect
+ */
+
+static void mpiix_error_handler(struct ata_port *ap)
+{
+ ata_bmdma_drive_eh(ap, mpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ * mpiix_set_piomode - set initial PIO mode data
+ * @ap: ATA interface
+ * @adev: ATA device
+ *
+ * Called to do the PIO mode setup. The MPIIX allows us to program the
+ * IORDY sample point (2-5 clocks), recovery 1-4 clocks and whether
+ * prefetching or iordy are used.
+ *
+ * This would get very ugly because we can only program timing for one
+ * device at a time, the other gets PIO0. Fortunately libata calls
+ * our qc_issue_prot command before a command is issued so we can
+ * flip the timings back and forth to reduce the pain.
+ */
+
+static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ int control = 0;
+ int pio = adev->pio_mode - XFER_PIO_0;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u16 idetim;
+ static const /* ISP RTC */
+ u8 timings[][2] = { { 0, 0 },
+ { 0, 0 },
+ { 1, 0 },
+ { 2, 1 },
+ { 2, 3 }, };
+
+ pci_read_config_word(pdev, IDETIM, &idetim);
+ /* Mask the IORDY/TIME/PPE0 bank for this device */
+ if (adev->class == ATA_DEV_ATA)
+ control |= PPE; /* PPE enable for disk */
+ if (ata_pio_need_iordy(adev))
+ control |= IORDY; /* IORDY */
+ if (pio > 0)
+ control |= FTIM; /* This drive is on the fast timing bank */
+
+ /* Mask out timing and clear both TIME bank selects */
+ idetim &= 0xCCEE;
+ idetim &= ~(0x07 << (2 * adev->devno));
+ idetim |= (control << (2 * adev->devno));
+
+ idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
+ pci_write_config_word(pdev, IDETIM, idetim);
+
+ /* We use ap->private_data as a pointer to the device currently
+ loaded for timing */
+ ap->private_data = adev;
+}
+
+/**
+ * mpiix_qc_issue_prot - 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
+ * neccessary. 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 mpiix_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ata_device *adev = qc->dev;
+
+ /* If modes have been configured and the channel data is not loaded
+ then load it. We have to check if pio_mode is set as the core code
+ does not set adev->pio_mode to XFER_PIO_0 while probing as would be
+ logical */
+
+ if (adev->pio_mode && adev != ap->private_data)
+ mpiix_set_piomode(ap, adev);
+
+ return ata_qc_issue_prot(qc);
+}
+
+static struct scsi_host_template mpiix_sht = {
+ .module = THIS_MODULE,
+ .name = DRV_NAME,
+ .ioctl = ata_scsi_ioctl,
+ .queuecommand = ata_scsi_queuecmd,
+ .can_queue = ATA_DEF_QUEUE,
+ .this_id = ATA_SHT_THIS_ID,
+ .sg_tablesize = LIBATA_MAX_PRD,
+ .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
+ .emulated = ATA_SHT_EMULATED,
+ .use_clustering = ATA_SHT_USE_CLUSTERING,
+ .proc_name = DRV_NAME,
+ .dma_boundary = ATA_DMA_BOUNDARY,
+ .slave_configure = ata_scsi_slave_config,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+#ifdef CONFIG_PM
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
+#endif
+};
+
+static struct ata_port_operations mpiix_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = mpiix_set_piomode,
+
+ .tf_load = ata_tf_load,
+ .tf_read = ata_tf_read,
+ .check_status = ata_check_status,
+ .exec_command = ata_exec_command,
+ .dev_select = ata_std_dev_select,
+
+ .freeze = ata_bmdma_freeze,
+ .thaw = ata_bmdma_thaw,
+ .error_handler = mpiix_error_handler,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+ .qc_prep = ata_qc_prep,
+ .qc_issue = mpiix_qc_issue_prot,
+ .data_xfer = ata_pio_data_xfer,
+
+ .irq_handler = ata_interrupt,
+ .irq_clear = ata_bmdma_irq_clear,
+
+ .port_start = ata_port_start,
+ .port_stop = ata_port_stop,
+ .host_stop = ata_host_stop
+};
+
+static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ /* Single threaded by the PCI probe logic */
+ static struct ata_probe_ent probe[2];
+ static int printed_version;
+ u16 idetim;
+ int enabled;
+
+ if (!printed_version++)
+ dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
+
+ /* MPIIX has many functions which can be turned on or off according
+ to other devices present. Make sure IDE is enabled before we try
+ and use it */
+
+ pci_read_config_word(dev, IDETIM, &idetim);
+ if (!(idetim & ENABLED))
+ return -ENODEV;
+
+ /* We do our own plumbing to avoid leaking special cases for whacko
+ ancient hardware into the core code. There are two issues to
+ worry about. #1 The chip is a bridge so if in legacy mode and
+ without BARs set fools the setup. #2 If you pci_disable_device
+ the MPIIX your box goes castors up */
+
+ INIT_LIST_HEAD(&probe[0].node);
+ probe[0].dev = pci_dev_to_dev(dev);
+ probe[0].port_ops = &mpiix_port_ops;
+ probe[0].sht = &mpiix_sht;
+ probe[0].pio_mask = 0x1F;
+ probe[0].irq = 14;
+ probe[0].irq_flags = SA_SHIRQ;
+ probe[0].port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
+ probe[0].n_ports = 1;
+ probe[0].port[0].cmd_addr = 0x1F0;
+ probe[0].port[0].ctl_addr = 0x3F6;
+ probe[0].port[0].altstatus_addr = 0x3F6;
+
+ /* The secondary lurks at different addresses but is otherwise
+ the same beastie */
+
+ INIT_LIST_HEAD(&probe[1].node);
+ probe[1] = probe[0];
+ probe[1].irq = 15;
+ probe[1].port[0].cmd_addr = 0x170;
+ probe[1].port[0].ctl_addr = 0x376;
+ probe[1].port[0].altstatus_addr = 0x376;
+
+ /* Let libata fill in the port details */
+ ata_std_ports(&probe[0].port[0]);
+ ata_std_ports(&probe[1].port[0]);
+
+ /* Now add the port that is active */
+ enabled = (idetim & SECONDARY) ? 1 : 0;
+
+ if (ata_device_add(&probe[enabled]))
+ return 0;
+ return -ENODEV;
+}
+
+/**
+ * mpiix_remove_one - device unload
+ * @pdev: PCI device being removed
+ *
+ * Handle an unplug/unload event for a PCI device. Unload the
+ * PCI driver but do not use the default handler as we *MUST NOT*
+ * disable the device as it has other functions.
+ */
+
+static void __devexit mpiix_remove_one(struct pci_dev *pdev)
+{
+ struct device *dev = pci_dev_to_dev(pdev);
+ struct ata_host *host = dev_get_drvdata(dev);
+
+ ata_host_remove(host);
+ dev_set_drvdata(dev, NULL);
+}
+
+static const struct pci_device_id mpiix[] = {
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX), },
+
+ { },
+};
+
+static struct pci_driver mpiix_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = mpiix,
+ .probe = mpiix_init_one,
+ .remove = mpiix_remove_one,
+#ifdef CONFIG_PM
+ .suspend = ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+static int __init mpiix_init(void)
+{
+ return pci_register_driver(&mpiix_pci_driver);
+}
+
+static void __exit mpiix_exit(void)
+{
+ pci_unregister_driver(&mpiix_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Intel MPIIX");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, mpiix);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(mpiix_init);
+module_exit(mpiix_exit);
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