1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/ata/pata_ns87410.c b/drivers/ata/pata_ns87410.c
new file mode 100644
index 000000000..ca3ab2736
--- /dev/null
+++ b/drivers/ata/pata_ns87410.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pata_ns87410.c 	- National Semiconductor 87410 PATA for new ATA layer
+ *			  (C) 2006 Red Hat Inc
+ */
+
+#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_ns87410"
+#define DRV_VERSION "0.4.6"
+
+/**
+ *	ns87410_pre_reset		-	probe begin
+ *	@link: ATA link
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Check enabled ports
+ */
+
+static int ns87410_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 ns87410_enable_bits[] = {
+		{ 0x43, 1, 0x08, 0x08 },
+		{ 0x47, 1, 0x08, 0x08 }
+	};
+
+	if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
+		return -ENOENT;
+
+	return ata_sff_prereset(link, deadline);
+}
+
+/**
+ *	ns87410_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Program timing data. This is kept per channel not per device,
+ *	and only affects the data port.
+ */
+
+static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int port = 0x40 + 4 * ap->port_no;
+	u8 idetcr, idefr;
+	struct ata_timing at;
+
+	static const u8 activebits[15] = {
+		0, 1, 2, 3, 4,
+		5, 5, 6, 6, 6,
+		6, 7, 7, 7, 7
+	};
+
+	static const u8 recoverbits[12] = {
+		0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
+	};
+
+	pci_read_config_byte(pdev, port + 3, &idefr);
+
+	if (ata_pio_need_iordy(adev))
+		idefr |= 0x04;	/* IORDY enable */
+	else
+		idefr &= ~0x04;
+
+	if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
+		dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
+		return;
+	}
+
+	at.active = clamp_val(at.active, 2, 16) - 2;
+	at.setup = clamp_val(at.setup, 1, 4) - 1;
+	at.recover = clamp_val(at.recover, 1, 12) - 1;
+
+	idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
+
+	pci_write_config_byte(pdev, port, idetcr);
+	pci_write_config_byte(pdev, port + 3, idefr);
+	/* We use ap->private_data as a pointer to the device currently
+	   loaded for timing */
+	ap->private_data = adev;
+}
+
+/**
+ *	ns87410_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 ns87410_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)
+		ns87410_set_piomode(ap, adev);
+
+	return ata_sff_qc_issue(qc);
+}
+
+static struct scsi_host_template ns87410_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations ns87410_port_ops = {
+	.inherits	= &ata_sff_port_ops,
+	.qc_issue	= ns87410_qc_issue,
+	.cable_detect	= ata_cable_40wire,
+	.set_piomode	= ns87410_set_piomode,
+	.prereset	= ns87410_pre_reset,
+};
+
+static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info info = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO3,
+		.port_ops = &ns87410_port_ops
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+	return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
+}
+
+static const struct pci_device_id ns87410[] = {
+	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
+
+	{ },
+};
+
+static struct pci_driver ns87410_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= ns87410,
+	.probe 		= ns87410_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(ns87410_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, ns87410);
+MODULE_VERSION(DRV_VERSION);