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);
139