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
29 #define DRV_NAME "pata_palmld"
30
31 struct palmld_pata {
32 struct ata_host *host;
33 struct gpio_desc *power;
34 struct gpio_desc *reset;
35 };
36
37 static struct scsi_host_template palmld_sht = {
38 ATA_PIO_SHT(DRV_NAME),
39 };
40
41 static struct ata_port_operations palmld_port_ops = {
42 .inherits = &ata_sff_port_ops,
43 .sff_data_xfer = ata_sff_data_xfer32,
44 .cable_detect = ata_cable_40wire,
45 };
46
palmld_pata_probe(struct platform_device * pdev)47 static int palmld_pata_probe(struct platform_device *pdev)
48 {
49 struct palmld_pata *lda;
50 struct ata_port *ap;
51 void __iomem *mem;
52 struct device *dev = &pdev->dev;
53 int ret;
54
55 lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
56 if (!lda)
57 return -ENOMEM;
58
59 /* allocate host */
60 lda->host = ata_host_alloc(dev, 1);
61 if (!lda->host)
62 return -ENOMEM;
63
64 /* remap drive's physical memory address */
65 mem = devm_platform_ioremap_resource(pdev, 0);
66 if (IS_ERR(mem))
67 return PTR_ERR(mem);
68
69 /* request and activate power and reset GPIOs */
70 lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
71 if (IS_ERR(lda->power))
72 return PTR_ERR(lda->power);
73 lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
74 if (IS_ERR(lda->reset)) {
75 gpiod_set_value(lda->power, 0);
76 return PTR_ERR(lda->reset);
77 }
78
79 /* Assert reset to reset the drive */
80 gpiod_set_value(lda->reset, 1);
81 msleep(30);
82 gpiod_set_value(lda->reset, 0);
83 msleep(30);
84
85 /* setup the ata port */
86 ap = lda->host->ports[0];
87 ap->ops = &palmld_port_ops;
88 ap->pio_mask = ATA_PIO4;
89 ap->flags |= ATA_FLAG_PIO_POLLING;
90
91 /* memory mapping voodoo */
92 ap->ioaddr.cmd_addr = mem + 0x10;
93 ap->ioaddr.altstatus_addr = mem + 0xe;
94 ap->ioaddr.ctl_addr = mem + 0xe;
95
96 /* start the port */
97 ata_sff_std_ports(&ap->ioaddr);
98
99 /* activate host */
100 ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
101 &palmld_sht);
102 /* power down on failure */
103 if (ret) {
104 gpiod_set_value(lda->power, 0);
105 return ret;
106 }
107
108 platform_set_drvdata(pdev, lda);
109 return 0;
110 }
111
palmld_pata_remove(struct platform_device * pdev)112 static int palmld_pata_remove(struct platform_device *pdev)
113 {
114 struct palmld_pata *lda = platform_get_drvdata(pdev);
115
116 ata_platform_remove_one(pdev);
117
118 /* power down the HDD */
119 gpiod_set_value(lda->power, 0);
120
121 return 0;
122 }
123
124 static struct platform_driver palmld_pata_platform_driver = {
125 .driver = {
126 .name = DRV_NAME,
127 },
128 .probe = palmld_pata_probe,
129 .remove = palmld_pata_remove,
130 };
131
132 module_platform_driver(palmld_pata_platform_driver);
133
134 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
135 MODULE_DESCRIPTION("PalmLD PATA driver");
136 MODULE_LICENSE("GPL");
137 MODULE_ALIAS("platform:" DRV_NAME);
138
