diff options
Diffstat (limited to 'drivers/ata/pata_mpiix.c')
| -rw-r--r-- | drivers/ata/pata_mpiix.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c new file mode 100644 index 000000000..8fda0e32c --- /dev/null +++ b/drivers/ata/pata_mpiix.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * pata_mpiix.c - Intel MPIIX PATA for new ATA layer + * (C) 2005-2006 Red Hat Inc + * Alan Cox <alan@lxorguk.ukuu.org.uk> + * + * 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 consciously 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/blkdev.h> +#include <linux/delay.h> +#include <scsi/scsi_host.h> +#include <linux/libata.h> + +#define DRV_NAME "pata_mpiix" +#define DRV_VERSION "0.7.7" + +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_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 mpiix_enable_bits = { 0x6D, 1, 0x80, 0x80 }; + + if (!pci_test_config_bits(pdev, &mpiix_enable_bits)) + return -ENOENT; + + return ata_sff_prereset(link, deadline); +} + +/** + * 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 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/PPE for this device */ + if (adev->class == ATA_DEV_ATA) + control |= PPE; /* Enable prefetch/posting for disk */ + if (ata_pio_need_iordy(adev)) + control |= IORDY; + if (pio > 1) + control |= FTIM; /* This drive is on the fast timing bank */ + + /* Mask out timing and clear both TIME bank selects */ + idetim &= 0xCCEE; + idetim &= ~(0x07 << (4 * adev->devno)); + idetim |= control << (4 * 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 - 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 mpiix_qc_issue(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_sff_qc_issue(qc); +} + +static struct scsi_host_template mpiix_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static struct ata_port_operations mpiix_port_ops = { + .inherits = &ata_sff_port_ops, + .qc_issue = mpiix_qc_issue, + .cable_detect = ata_cable_40wire, + .set_piomode = mpiix_set_piomode, + .prereset = mpiix_pre_reset, + .sff_data_xfer = ata_sff_data_xfer32, +}; + +static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + /* Single threaded by the PCI probe logic */ + struct ata_host *host; + struct ata_port *ap; + void __iomem *cmd_addr, *ctl_addr; + u16 idetim; + int cmd, ctl, irq; + + ata_print_version_once(&dev->dev, DRV_VERSION); + + host = ata_host_alloc(&dev->dev, 1); + if (!host) + return -ENOMEM; + ap = host->ports[0]; + + /* 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; + + /* See if it's primary or secondary channel... */ + if (!(idetim & SECONDARY)) { + cmd = 0x1F0; + ctl = 0x3F6; + irq = 14; + } else { + cmd = 0x170; + ctl = 0x376; + irq = 15; + } + + cmd_addr = devm_ioport_map(&dev->dev, cmd, 8); + ctl_addr = devm_ioport_map(&dev->dev, ctl, 1); + if (!cmd_addr || !ctl_addr) + return -ENOMEM; + + ata_port_desc(ap, "cmd 0x%x ctl 0x%x", cmd, ctl); + + /* 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 */ + + ap->ops = &mpiix_port_ops; + ap->pio_mask = ATA_PIO4; + ap->flags |= ATA_FLAG_SLAVE_POSS; + + ap->ioaddr.cmd_addr = cmd_addr; + ap->ioaddr.ctl_addr = ctl_addr; + ap->ioaddr.altstatus_addr = ctl_addr; + + /* Let libata fill in the port details */ + ata_sff_std_ports(&ap->ioaddr); + + /* activate host */ + return ata_host_activate(host, irq, ata_sff_interrupt, IRQF_SHARED, + &mpiix_sht); +} + +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 = ata_pci_remove_one, +#ifdef CONFIG_PM_SLEEP + .suspend = ata_pci_device_suspend, + .resume = ata_pci_device_resume, +#endif +}; + +module_pci_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); |