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