1 files changed, 281 insertions, 0 deletions
diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
new file mode 100644
index 000000000..fa2bfc344
--- /dev/null
+++ b/drivers/ata/pata_acpi.c
@@ -0,0 +1,281 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *	ACPI PATA driver
+ *
+ *	(c) 2007 Red Hat
+ */
+
+#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 <linux/gfp.h>
+#include <linux/acpi.h>
+#include <linux/libata.h>
+#include <linux/ata.h>
+#include <scsi/scsi_host.h>
+
+#define DRV_NAME	"pata_acpi"
+#define DRV_VERSION	"0.2.3"
+
+struct pata_acpi {
+	struct ata_acpi_gtm gtm;
+	void *last;
+	unsigned long mask[2];
+};
+
+/**
+ *	pacpi_pre_reset	-	check for 40/80 pin
+ *	@ap: Port
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Perform the PATA port setup we need.
+ */
+
+static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct pata_acpi *acpi = ap->private_data;
+	if (ACPI_HANDLE(&ap->tdev) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
+		return -ENODEV;
+
+	return ata_sff_prereset(link, deadline);
+}
+
+/**
+ *	pacpi_cable_detect	-	cable type detection
+ *	@ap: port to detect
+ *
+ *	Perform device specific cable detection
+ */
+
+static int pacpi_cable_detect(struct ata_port *ap)
+{
+	struct pata_acpi *acpi = ap->private_data;
+
+	if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
+		return ATA_CBL_PATA80;
+	else
+		return ATA_CBL_PATA40;
+}
+
+/**
+ *	pacpi_discover_modes	-	filter non ACPI modes
+ *	@adev: ATA device
+ *	@mask: proposed modes
+ *
+ *	Try the modes available and see which ones the ACPI method will
+ *	set up sensibly. From this we get a mask of ACPI modes we can use
+ */
+
+static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
+{
+	struct pata_acpi *acpi = ap->private_data;
+	struct ata_acpi_gtm probe;
+	unsigned int xfer_mask;
+
+	probe = acpi->gtm;
+
+	ata_acpi_gtm(ap, &probe);
+
+	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
+
+	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
+		ap->cbl = ATA_CBL_PATA80;
+
+	return xfer_mask;
+}
+
+/**
+ *	pacpi_mode_filter	-	mode filter for ACPI
+ *	@adev: device
+ *	@mask: mask of valid modes
+ *
+ *	Filter the valid mode list according to our own specific rules, in
+ *	this case the list of discovered valid modes obtained by ACPI probing
+ */
+
+static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
+{
+	struct pata_acpi *acpi = adev->link->ap->private_data;
+	return mask & acpi->mask[adev->devno];
+}
+
+/**
+ *	pacpi_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ */
+
+static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	int unit = adev->devno;
+	struct pata_acpi *acpi = ap->private_data;
+	const struct ata_timing *t;
+
+	if (!(acpi->gtm.flags & 0x10))
+		unit = 0;
+
+	/* Now stuff the nS values into the structure */
+	t = ata_timing_find_mode(adev->pio_mode);
+	acpi->gtm.drive[unit].pio = t->cycle;
+	ata_acpi_stm(ap, &acpi->gtm);
+	/* See what mode we actually got */
+	ata_acpi_gtm(ap, &acpi->gtm);
+}
+
+/**
+ *	pacpi_set_dmamode	-	set initial DMA mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ */
+
+static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	int unit = adev->devno;
+	struct pata_acpi *acpi = ap->private_data;
+	const struct ata_timing *t;
+
+	if (!(acpi->gtm.flags & 0x10))
+		unit = 0;
+
+	/* Now stuff the nS values into the structure */
+	t = ata_timing_find_mode(adev->dma_mode);
+	if (adev->dma_mode >= XFER_UDMA_0) {
+		acpi->gtm.drive[unit].dma = t->udma;
+		acpi->gtm.flags |= (1 << (2 * unit));
+	} else {
+		acpi->gtm.drive[unit].dma = t->cycle;
+		acpi->gtm.flags &= ~(1 << (2 * unit));
+	}
+	ata_acpi_stm(ap, &acpi->gtm);
+	/* See what mode we actually got */
+	ata_acpi_gtm(ap, &acpi->gtm);
+}
+
+/**
+ *	pacpi_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.
+ */
+
+static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_device *adev = qc->dev;
+	struct pata_acpi *acpi = ap->private_data;
+
+	if (acpi->gtm.flags & 0x10)
+		return ata_bmdma_qc_issue(qc);
+
+	if (adev != acpi->last) {
+		pacpi_set_piomode(ap, adev);
+		if (ata_dma_enabled(adev))
+			pacpi_set_dmamode(ap, adev);
+		acpi->last = adev;
+	}
+	return ata_bmdma_qc_issue(qc);
+}
+
+/**
+ *	pacpi_port_start	-	port setup
+ *	@ap: ATA port being set up
+ *
+ *	Use the port_start hook to maintain private control structures
+ */
+
+static int pacpi_port_start(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	struct pata_acpi *acpi;
+
+	if (ACPI_HANDLE(&ap->tdev) == NULL)
+		return -ENODEV;
+
+	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
+	if (ap->private_data == NULL)
+		return -ENOMEM;
+	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
+	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
+	return ata_bmdma_port_start(ap);
+}
+
+static struct scsi_host_template pacpi_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations pacpi_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+	.qc_issue		= pacpi_qc_issue,
+	.cable_detect		= pacpi_cable_detect,
+	.mode_filter		= pacpi_mode_filter,
+	.set_piomode		= pacpi_set_piomode,
+	.set_dmamode		= pacpi_set_dmamode,
+	.prereset		= pacpi_pre_reset,
+	.port_start		= pacpi_port_start,
+};
+
+
+/**
+ *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
+ *	@pdev: PCI device to register
+ *	@ent: Entry in pacpi_pci_tbl matching with @pdev
+ *
+ *	Called from kernel PCI layer.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, or -ERRNO value.
+ */
+
+static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info info = {
+		.flags		= ATA_FLAG_SLAVE_POSS,
+
+		.pio_mask	= ATA_PIO4,
+		.mwdma_mask	= ATA_MWDMA2,
+		.udma_mask 	= ATA_UDMA6,
+
+		.port_ops	= &pacpi_ops,
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
+		int rc = pcim_enable_device(pdev);
+		if (rc < 0)
+			return rc;
+		pcim_pin_device(pdev);
+	}
+	return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
+}
+
+static const struct pci_device_id pacpi_pci_tbl[] = {
+	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
+	{ }	/* terminate list */
+};
+
+static struct pci_driver pacpi_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= pacpi_pci_tbl,
+	.probe			= pacpi_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(pacpi_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
+MODULE_VERSION(DRV_VERSION);