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
32 struct palmld_pata {
33 struct ata_host *host;
34 struct gpio_desc *power;
35 struct gpio_desc *reset;
36 };
37
38 static struct scsi_host_template palmld_sht = {
39 ATA_PIO_SHT(DRV_NAME),
40 };
41
42 static 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
palmld_pata_probe(struct platform_device * pdev)48 static 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
palmld_pata_remove(struct platform_device * pdev)113 static 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
125 static 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
133 module_platform_driver(palmld_pata_platform_driver);
134
135 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
136 MODULE_DESCRIPTION("PalmLD PATA driver");
137 MODULE_LICENSE("GPL");
138 MODULE_ALIAS("platform:" DRV_NAME);
139