Warning: That file was not part of the compilation database. It may have many parsing errors.

1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * Amiga Gayle PATA controller driver
5 *
6 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
7 * http://www.samsung.com
8 *
9 * Based on gayle.c:
10 *
11 * Created 12 Jul 1997 by Geert Uytterhoeven
12 */
13
14#include <linux/ata.h>
15#include <linux/blkdev.h>
16#include <linux/delay.h>
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/libata.h>
20#include <linux/mm.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <linux/zorro.h>
24#include <scsi/scsi_cmnd.h>
25#include <scsi/scsi_host.h>
26
27#include <asm/amigahw.h>
28#include <asm/amigaints.h>
29#include <asm/amigayle.h>
30#include <asm/ide.h>
31#include <asm/setup.h>
32
33#define DRV_NAME "pata_gayle"
34#define DRV_VERSION "0.1.0"
35
36#define GAYLE_CONTROL 0x101a
37
38static struct scsi_host_template pata_gayle_sht = {
39 ATA_PIO_SHT(DRV_NAME),
40};
41
42/* FIXME: is this needed? */
43static unsigned int pata_gayle_data_xfer(struct ata_queued_cmd *qc,
44 unsigned char *buf,
45 unsigned int buflen, int rw)
46{
47 struct ata_device *dev = qc->dev;
48 struct ata_port *ap = dev->link->ap;
49 void __iomem *data_addr = ap->ioaddr.data_addr;
50 unsigned int words = buflen >> 1;
51
52 /* Transfer multiple of 2 bytes */
53 if (rw == READ)
54 raw_insw((u16 *)data_addr, (u16 *)buf, words);
55 else
56 raw_outsw((u16 *)data_addr, (u16 *)buf, words);
57
58 /* Transfer trailing byte, if any. */
59 if (unlikely(buflen & 0x01)) {
60 unsigned char pad[2] = { };
61
62 /* Point buf to the tail of buffer */
63 buf += buflen - 1;
64
65 if (rw == READ) {
66 raw_insw((u16 *)data_addr, (u16 *)pad, 1);
67 *buf = pad[0];
68 } else {
69 pad[0] = *buf;
70 raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
71 }
72 words++;
73 }
74
75 return words << 1;
76}
77
78/*
79 * Provide our own set_mode() as we don't want to change anything that has
80 * already been configured..
81 */
82static int pata_gayle_set_mode(struct ata_link *link,
83 struct ata_device **unused)
84{
85 struct ata_device *dev;
86
87 ata_for_each_dev(dev, link, ENABLED) {
88 /* We don't really care */
89 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
90 dev->xfer_shift = ATA_SHIFT_PIO;
91 dev->flags |= ATA_DFLAG_PIO;
92 ata_dev_info(dev, "configured for PIO\n");
93 }
94 return 0;
95}
96
97static bool pata_gayle_irq_check(struct ata_port *ap)
98{
99 u8 ch;
100
101 ch = z_readb((unsigned long)ap->private_data);
102
103 return !!(ch & GAYLE_IRQ_IDE);
104}
105
106static void pata_gayle_irq_clear(struct ata_port *ap)
107{
108 (void)z_readb((unsigned long)ap->ioaddr.status_addr);
109 z_writeb(0x7c, (unsigned long)ap->private_data);
110}
111
112static struct ata_port_operations pata_gayle_a1200_ops = {
113 .inherits = &ata_sff_port_ops,
114 .sff_data_xfer = pata_gayle_data_xfer,
115 .sff_irq_check = pata_gayle_irq_check,
116 .sff_irq_clear = pata_gayle_irq_clear,
117 .cable_detect = ata_cable_unknown,
118 .set_mode = pata_gayle_set_mode,
119};
120
121static struct ata_port_operations pata_gayle_a4000_ops = {
122 .inherits = &ata_sff_port_ops,
123 .sff_data_xfer = pata_gayle_data_xfer,
124 .cable_detect = ata_cable_unknown,
125 .set_mode = pata_gayle_set_mode,
126};
127
128static int __init pata_gayle_init_one(struct platform_device *pdev)
129{
130 struct resource *res;
131 struct gayle_ide_platform_data *pdata;
132 struct ata_host *host;
133 struct ata_port *ap;
134 void __iomem *base;
135 int ret;
136
137 pdata = dev_get_platdata(&pdev->dev);
138
139 dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n",
140 pdata->explicit_ack ? 1200 : 4000);
141
142 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143 if (!res)
144 return -ENODEV;
145
146 if (!devm_request_mem_region(&pdev->dev, res->start,
147 resource_size(res), DRV_NAME)) {
148 pr_err(DRV_NAME ": resources busy\n");
149 return -EBUSY;
150 }
151
152 /* allocate host */
153 host = ata_host_alloc(&pdev->dev, 1);
154 if (!host)
155 return -ENOMEM;
156
157 ap = host->ports[0];
158
159 if (pdata->explicit_ack)
160 ap->ops = &pata_gayle_a1200_ops;
161 else
162 ap->ops = &pata_gayle_a4000_ops;
163
164 ap->pio_mask = ATA_PIO4;
165 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
166
167 base = ZTWO_VADDR(pdata->base);
168 ap->ioaddr.data_addr = base;
169 ap->ioaddr.error_addr = base + 2 + 1 * 4;
170 ap->ioaddr.feature_addr = base + 2 + 1 * 4;
171 ap->ioaddr.nsect_addr = base + 2 + 2 * 4;
172 ap->ioaddr.lbal_addr = base + 2 + 3 * 4;
173 ap->ioaddr.lbam_addr = base + 2 + 4 * 4;
174 ap->ioaddr.lbah_addr = base + 2 + 5 * 4;
175 ap->ioaddr.device_addr = base + 2 + 6 * 4;
176 ap->ioaddr.status_addr = base + 2 + 7 * 4;
177 ap->ioaddr.command_addr = base + 2 + 7 * 4;
178
179 ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL;
180 ap->ioaddr.ctl_addr = base + GAYLE_CONTROL;
181
182 ap->private_data = (void *)ZTWO_VADDR(pdata->irqport);
183
184 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base,
185 pdata->base + GAYLE_CONTROL);
186
187 ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
188 IRQF_SHARED, &pata_gayle_sht);
189 if (ret)
190 return ret;
191
192 platform_set_drvdata(pdev, host);
193
194 return 0;
195}
196
197static int __exit pata_gayle_remove_one(struct platform_device *pdev)
198{
199 struct ata_host *host = platform_get_drvdata(pdev);
200
201 ata_host_detach(host);
202
203 return 0;
204}
205
206static struct platform_driver pata_gayle_driver = {
207 .remove = __exit_p(pata_gayle_remove_one),
208 .driver = {
209 .name = "amiga-gayle-ide",
210 },
211};
212
213module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one);
214
215MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
216MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");
217MODULE_LICENSE("GPL v2");
218MODULE_ALIAS("platform:amiga-gayle-ide");
219MODULE_VERSION(DRV_VERSION);
220

Warning: That file was not part of the compilation database. It may have many parsing errors.