1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * drivers/ata/pata_palmld.c
  4 *
  5 * Driver for IDE channel in Palm LifeDrive
  6 *
  7 * Based on research of:
  8 *		Alex Osborne <ato@meshy.org>
  9 *
 10 * Rewrite for mainline:
 11 *		Marek Vasut <marek.vasut@gmail.com>
 12 *
 13 * Rewritten version based on pata_ixp4xx_cf.c:
 14 * ixp4xx PATA/Compact Flash driver
 15 * Copyright (C) 2006-07 Tower Technologies
 16 * Author: Alessandro Zummo <a.zummo@towertech.it>
 17 */
 18
 19#include <linux/kernel.h>
 20#include <linux/module.h>
 21#include <linux/libata.h>
 22#include <linux/irq.h>
 23#include <linux/platform_device.h>
 24#include <linux/delay.h>
 25#include <linux/gpio/consumer.h>
 26
 27#include <scsi/scsi_host.h>
 28#include <mach/palmld.h>
 29
 30#define DRV_NAME "pata_palmld"
 31
 32struct palmld_pata {
 33	struct ata_host *host;
 34	struct gpio_desc *power;
 35	struct gpio_desc *reset;
 36};
 37
 38static struct scsi_host_template palmld_sht = {
 39	ATA_PIO_SHT(DRV_NAME),
 40};
 41
 42static struct ata_port_operations palmld_port_ops = {
 43	.inherits		= &ata_sff_port_ops,
 44	.sff_data_xfer		= ata_sff_data_xfer32,
 45	.cable_detect		= ata_cable_40wire,
 46};
 47
 48static int palmld_pata_probe(struct platform_device *pdev)
 49{
 50	struct palmld_pata *lda;
 51	struct ata_port *ap;
 52	void __iomem *mem;
 53	struct device *dev = &pdev->dev;
 54	int ret;
 55
 56	lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
 57	if (!lda)
 58		return -ENOMEM;
 59
 60	/* allocate host */
 61	lda->host = ata_host_alloc(dev, 1);
 62	if (!lda->host)
 63		return -ENOMEM;
 64
 65	/* remap drive's physical memory address */
 66	mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
 67	if (!mem)
 68		return -ENOMEM;
 69
 70	/* request and activate power and reset GPIOs */
 71	lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
 72	if (IS_ERR(lda->power))
 73		return PTR_ERR(lda->power);
 74	lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 75	if (IS_ERR(lda->reset)) {
 76		gpiod_set_value(lda->power, 0);
 77		return PTR_ERR(lda->reset);
 78	}
 79
 80	/* Assert reset to reset the drive */
 81	gpiod_set_value(lda->reset, 1);
 82	msleep(30);
 83	gpiod_set_value(lda->reset, 0);
 84	msleep(30);
 85
 86	/* setup the ata port */
 87	ap = lda->host->ports[0];
 88	ap->ops	= &palmld_port_ops;
 89	ap->pio_mask = ATA_PIO4;
 90	ap->flags |= ATA_FLAG_PIO_POLLING;
 91
 92	/* memory mapping voodoo */
 93	ap->ioaddr.cmd_addr = mem + 0x10;
 94	ap->ioaddr.altstatus_addr = mem + 0xe;
 95	ap->ioaddr.ctl_addr = mem + 0xe;
 96
 97	/* start the port */
 98	ata_sff_std_ports(&ap->ioaddr);
 99
100	/* activate host */
101	ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
102				&palmld_sht);
103	/* power down on failure */
104	if (ret) {
105		gpiod_set_value(lda->power, 0);
106		return ret;
107	}
108
109	platform_set_drvdata(pdev, lda);
110	return 0;
111}
112
113static int palmld_pata_remove(struct platform_device *pdev)
114{
115	struct palmld_pata *lda = platform_get_drvdata(pdev);
116
117	ata_platform_remove_one(pdev);
118
119	/* power down the HDD */
120	gpiod_set_value(lda->power, 0);
121
122	return 0;
123}
124
125static struct platform_driver palmld_pata_platform_driver = {
126	.driver	 = {
127		.name   = DRV_NAME,
128	},
129	.probe		= palmld_pata_probe,
130	.remove		= palmld_pata_remove,
131};
132
133module_platform_driver(palmld_pata_platform_driver);
134
135MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
136MODULE_DESCRIPTION("PalmLD PATA driver");
137MODULE_LICENSE("GPL");
138MODULE_ALIAS("platform:" DRV_NAME);