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