xref: /openbmc/linux/drivers/ata/pata_gayle.c (revision 4263cde5)
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 
37 static const struct scsi_host_template pata_gayle_sht = {
38 	ATA_PIO_SHT(DRV_NAME),
39 };
40 
41 /* FIXME: is this needed? */
pata_gayle_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)42 static 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  */
pata_gayle_set_mode(struct ata_link * link,struct ata_device ** unused)81 static 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 
pata_gayle_irq_check(struct ata_port * ap)96 static 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 
pata_gayle_irq_clear(struct ata_port * ap)105 static 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 
111 static 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 
120 static 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 
pata_gayle_init_one(struct platform_device * pdev)127 static int __init 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 
pata_gayle_remove_one(struct platform_device * pdev)196 static int __exit 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 	return 0;
203 }
204 
205 static struct platform_driver pata_gayle_driver = {
206 	.remove = __exit_p(pata_gayle_remove_one),
207 	.driver   = {
208 		.name	= "amiga-gayle-ide",
209 	},
210 };
211 
212 module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one);
213 
214 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
215 MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");
216 MODULE_LICENSE("GPL v2");
217 MODULE_ALIAS("platform:amiga-gayle-ide");
218 MODULE_VERSION(DRV_VERSION);
219