1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/ata/pata_palmld.c b/drivers/ata/pata_palmld.c
new file mode 100644
index 000000000..51caa2a42
--- /dev/null
+++ b/drivers/ata/pata_palmld.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/ata/pata_palmld.c
+ *
+ * Driver for IDE channel in Palm LifeDrive
+ *
+ * Based on research of:
+ *		Alex Osborne <ato@meshy.org>
+ *
+ * Rewrite for mainline:
+ *		Marek Vasut <marek.vasut@gmail.com>
+ *
+ * Rewritten version based on pata_ixp4xx_cf.c:
+ * ixp4xx PATA/Compact Flash driver
+ * Copyright (C) 2006-07 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+
+#include <scsi/scsi_host.h>
+
+#define DRV_NAME "pata_palmld"
+
+struct palmld_pata {
+	struct ata_host *host;
+	struct gpio_desc *power;
+	struct gpio_desc *reset;
+};
+
+static struct scsi_host_template palmld_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations palmld_port_ops = {
+	.inherits		= &ata_sff_port_ops,
+	.sff_data_xfer		= ata_sff_data_xfer32,
+	.cable_detect		= ata_cable_40wire,
+};
+
+static int palmld_pata_probe(struct platform_device *pdev)
+{
+	struct palmld_pata *lda;
+	struct ata_port *ap;
+	void __iomem *mem;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
+	if (!lda)
+		return -ENOMEM;
+
+	/* allocate host */
+	lda->host = ata_host_alloc(dev, 1);
+	if (!lda->host)
+		return -ENOMEM;
+
+	/* remap drive's physical memory address */
+	mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
+
+	/* request and activate power and reset GPIOs */
+	lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
+	if (IS_ERR(lda->power))
+		return PTR_ERR(lda->power);
+	lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(lda->reset)) {
+		gpiod_set_value(lda->power, 0);
+		return PTR_ERR(lda->reset);
+	}
+
+	/* Assert reset to reset the drive */
+	gpiod_set_value(lda->reset, 1);
+	msleep(30);
+	gpiod_set_value(lda->reset, 0);
+	msleep(30);
+
+	/* setup the ata port */
+	ap = lda->host->ports[0];
+	ap->ops	= &palmld_port_ops;
+	ap->pio_mask = ATA_PIO4;
+	ap->flags |= ATA_FLAG_PIO_POLLING;
+
+	/* memory mapping voodoo */
+	ap->ioaddr.cmd_addr = mem + 0x10;
+	ap->ioaddr.altstatus_addr = mem + 0xe;
+	ap->ioaddr.ctl_addr = mem + 0xe;
+
+	/* start the port */
+	ata_sff_std_ports(&ap->ioaddr);
+
+	/* activate host */
+	ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
+				&palmld_sht);
+	/* power down on failure */
+	if (ret) {
+		gpiod_set_value(lda->power, 0);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, lda);
+	return 0;
+}
+
+static int palmld_pata_remove(struct platform_device *pdev)
+{
+	struct palmld_pata *lda = platform_get_drvdata(pdev);
+
+	ata_platform_remove_one(pdev);
+
+	/* power down the HDD */
+	gpiod_set_value(lda->power, 0);
+
+	return 0;
+}
+
+static struct platform_driver palmld_pata_platform_driver = {
+	.driver	 = {
+		.name   = DRV_NAME,
+	},
+	.probe		= palmld_pata_probe,
+	.remove		= palmld_pata_remove,
+};
+
+module_platform_driver(palmld_pata_platform_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("PalmLD PATA driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);